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A bunch of friends decided to have a Valentine's Day potluck this weekend and I thought it was a perfect opportunity to use my heart shaped cake pan. I decided to try my hand at a red velvet cake, which would be a first for me. I used the recipe listed below, which was incredibly easy to follow. I decided to frost it with cream cheese frosting and then used a heart shaped cookie cutter to create a red heart on top. I hadn't planned on it but I ended up making a cake that looks like the heart containers in Zelda. I was so happy because I LOVE playing Zelda games. Sadly only a few people at the party got the reference, but they still liked the cake itself.
I learned a few things while making this cake:
Remember that a red velvet cake is supposed to be a soft, moist cake that has a slight taste of cocoa. The buttermilk gives it a moist texture but you must also make sure not to over mix the batter, otherwise it will turn out hard and dense. I used the recipe from this video as a basis for what I did.
- 2-1/2 cups of cake flour (I used sifted all-purpose flour)
- 2 Tbsp. cocoa powder
- 1/2 tsp. salt
- 1 cup buttermilk
- 1-1/2 Tbsp. red food coloring
- 1 cup melted butter
- 1-1/2 cups sugar
- 2 large eggs
- 1 tsp. vanilla
- 1 tsp. white vinegar
- 1 tsp. baking soda
1. Sift the flour, cocoa, and salt together in a medium sized bowl.
2. In a measuring cup mix buttermilk and food colouring together.
3. Cream sugar and butter together. Mix in vanilla and eggs.
4. Mix in 1/3 of flour mixture until fully mixed in.
5. Mix in 1/3 of buttermilk mixture until fully mixed in.
6. Repeat steps 4 and 5 until everything has been mixed together. Do not combine steps 4 and 5 into one step.
7. In a separate small bowl combine baking soda and vinegar. Add bubble mixture to batter and stir in with a spatula.
8. Line the bottom of the baking pan with parchment paper and butter the sides of the pan.
9. Pour in batter. Lift pan over counter about 2″ and drop on counter to release any trapped air in batter.
10. Bake at 350 degrees for 40 minutes or until a toothpick pierced into the centre of cake comes out clean.
11. Cool for an hour and then flip over on a plate. Remove parchment paper from bottom and turn cake right side up.
12. Use a long piece of unflavoured floss or string to cut cake in half, as shown in this video.
13. Frost bottom half of cake. Put top layer back on and frost the rest of the cake.
14. Place a heart shaped cookie cutter on top of cake in the centre and fill with red sprinkles.
15. Take cookie cutter off slowly and adjust frosting. Remove any stray sprinkles on cake.


text:
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Boston Emissions playlist – Sunday, July 31, 2016
Breeders – Divine Hammer
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—Monday, August 8 at PA's Lounge Somerville
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–Brendan from magic magic's other band
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On the show next Sunday, August 6
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Shadow Hymns comes out on August 26. Release show is Fri, Sept 9 at ONCE Ballroom.
We have many plans in-store for its release. Stay tuned!

subset: commoncrawl


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1880 Poems Of Adelaide Procter,Charles Dickens Intro A+
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Up for auction is this excellent condition 1880 Gilt Edges poetry book that has an introduction by Charles Dickens titled:THE POEMS OF ADELAIDE A. PROCTER COMPLETE EDITION WITH AN INTRODUCTION BY CHARLES DICKENS NEW YORK 1880 AN INTRODUCTION. BV CHARLES DICKENS. In the spring of the year 1853, I observed, as conductor of the weekly journal, Household Words, a short poem among the proffered contributions, very different, as I thought, from the shoal of verses perpetually setting through the office of such a periodical, and possessing much more merit. Its authoress was quite unknown to me. She was one Miss Mary Berwick, whom I had never heard of; and she was to be addressed by letter, if addressed at all, at a circulating library in the western district of London. Through this channel, Miss Berwick was informed that her poem was accepted, and was invited to send another. She complied, and became a regular and frequent contributor. Many letters passed between the journal and Miss Berwick, but Miss Berwick herself was never seen. How we came gradually to establish, at the office of Household Words, that we knew all about Miss Berwick, I have never discovered. But, /ve settled somehow, to our complete satisfaction, that she was governess in a family ; that she ... read more


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Hello Kittys Fun Times With Friends - Thumbelina - DVD
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|Publication number
|Publication type
|Publication date
|Sep 17, 1974
|Filing date
|Mar 30, 1973
|Priority date
|Mar 30, 1973
|Also published as
|Publication number
|D Rotier
|Original Assignee
|Honeywell Inc
|Export Citation
|BiBTeX, EndNote, RefMan
|Patent Citations (3), Referenced by (8), Classifications (22)
|External Links: USPTO, USPTO Assignment, Espacenet
United States Patent [191 Rotier [451 Sept. 17,1974
[ PROPAGATION SPEED DETERMINING APPARATUS Donald J. Rotier, St. Paul, Minn.
Honeywell Inc., Minneapolis, Minn.
Mar. 30, 1973 [75] Inventor:
Appl. No.:
U.S. Cl. 340/16 R, 340/5 S Int. Cl. GOls 5/18 Field of Search 340/5 R, 6 R, 16 R, 5 S; 235/15027, 151.32, 189; 343/112 C; 181/.5 AP
References Cited UNITED STATES PATENTS 7/1956 Rod et al. 340/3 R Antman 340/6 R Kiji et al. 340/l6 UX Primary Examiner-Richard A. Farley [5 7] ABSTRACT 11 Claims, 5 Drawing Figures 56 TRANSMITTER DRIVE 60 ELECTRONICS ULTRASONIC TRANSMITTERS 'E PULSE DETECTION START/ STOP 255 N CIRCUITRY LOGIC FILTERS COUNTERS -54 f COMPUTER A A (DETERMINATION or COMPUTERlUNlT LOS DIRECTION VECTOR 0) K cosmES) 12 \d CORRECTION Z l N-H K75 PATENIED EP 3.836.953
sum 1 or 3 Z(DOWN) PAIENIEDSEPIHQH 3.836.953
SHEEI 2 0F 3 56 TRANSMITTER DRIVE 60 ELECTRONICS J ULTRASONIC 54 TRANSMITTERS I s so -48 RECE'VERS PULSE DETECTION START/STOP OSC'LLATOR AND CIRCUITRY LOGIC AND FILTERS COUNTERS r64 r68 COMPUTER A A (DETERMINATION OF COMPUTER (UNIT YJ L05 DIRECTION VECTOR A0) 66 COSINES) \J CORRECTION 2 F'Gc 3 N+| TO COMPUTER 64 mgmgnsimlau 3.886.953 sum 3 or a FIG. 5
PROPAGATION SPEED DETERMINING APPARATUS BACKGROUND OF THE INVENTION This invention relates generally to systems in which acoustical energy is transmitted between transducers and the time required for transmission is used to determine the spatial orientation of the transducers. More particularly, the invention concerns a method and apparatus for determining the propagation speed of acoustical energy signals for application in such systems.
As used in this specification, the term acoustical energy signal" shall mean a signal from any portion of the sound spectrum, whether or not audible, and may include either a sonic or ultrasonic frequency signal. The term acoustical energy transducer" in this specification shall refer to a transmitter or receiver of acoustical energy signals. Furthermore propagation speed as used herein is defined as the rate of change of position of an acoustical energy wave front or other portion of an acoustical energy signal being transmitted through a physical medium.
Prior art systems for determining spatial orientation of objects with respect to one another have used acoustical energy transducers mounted on the objects, measured transit times required for propagation of acoustical energy signals between the objects, and calculated relative position of the objects using these transit times and an assumed propagation speed. A specific example of such a system is a head position determination system with ultrasonic transducers mounted on a reference object and on a helmet worn by the observer whose head position is being determined. One such system is described in a paper by Ivan E. Sutherland entitled A Head Mounted Three-Dimensional Display, published in Proceedings of the Fall Joint Computer Conference, (1968), pages 76076l. Other prior work using an ultrasonic position sensing device is described in a paper entitled The Lincoln Wand," by Lawrence G. Roberts, published in the Proceedings of the Fall Joint Computer Conference, (1966), pages 223-227. At page 227, Roberts identifies the existence of errors in the position determining system output caused by changes in speed of sound. Roberts error analysis indicated that changes in temperature of the medium caused small changes in speed of sound.
When acoustical energy transducer head position determining systems are applied to line-of-sight measurements of a pilot in an aircraft or other environments outside the laboratory, the errors caused by variations in temperature and pressure may become very significant. Therefore, if a line-of-sig'ht determining system is to be used by an observer in conjunction with vision aiding devices such as a low-light-level TV camera slaved to the line of sight, or in fact in any nonlaboratory practical application, some correction for propagation speed variations in the medium may be required.
Various applications using transmission of acoustical energy signals to determine position and orientation of objects with respect to one another have resulted in at tempts to solve this problem. A typical example of the prior art approach to variations in propagation speed is shown in U.S. Pat. No. 2,84l,775 to NE. Saunders. HO. 1 of the Saunders patent discloses receiving and transmitting transducers, in conjunction with other circuitry, used solely for the purpose of generating a propagation speed correction to the main apparatus described in the Saunders patent. Briefly, the compensation in Saunders is achieved by utilizing a set of transducers separate from the set of transducers used for the main system function. The separate set of transducers is spaced a known distance apart. The time required for transmission of a signal from one to the other of these transducers is used to determine the propagation speed in the medium. This determined propagation speed is then used in the primary apparatus. In Saunders the primary apparatus transmits sonic signals from a ship and receives signals reflected from irregularities in the transmission medium. The reflected signals are shifted in frequency due to the Doppler effect. The shift and the propagation speed of the signals is used to calculate ship velocity.
FIG. 6 of U.S. Pat. No. 3,496,524 to G. Stavis et al. shows a propagation speed determining scheme similar to that in Saunders, with separate transducers and a sample of the medium interposed between them.
These prior art propagation speed determining systems have a number of disadvantages. The use of transducers in addition to those in the main system apparatus and the cell containing the additional transducers occupies valuable space. The requirement of additional transducers and associated hardware increases the total cost and complexity of the system. A further associated hardware increases the total cost and complexity of the system. A further disadvantage is that differences in environmental conditions in the region of the transducers measuring propagation speed and those in the main apparatus will affect the accuracy of the propagation speed determination.
It is therefore an important object of the present invention to provide a method and apparatus for determining propagation speed of acoustical energy signals for use in a system having acoustical energy transducers, in which the transducers used for the main system function of determining relative position, velocity, or acceleration may also be used to provide information for propagation speed determination.
Another important object is to provide a method and apparatus for propagation speed determination in which errors due to differences in environmental conditions of the transducers used for the main system functions measurements and trasducers used to obtain propagation speed information are essentially eliminated.
SUMMARY OF THE INVENTION These and other objects are attained in apparatus for determining relative spatial orientation of two objects utilizing acoustical energy transducers positioned on each object, means for transmitting acoustical energy from transducers on one object to transducers on the other object, means for measuring transit times required for propagation of these signals, and means for calculating relative spatial orientation using the transit times and an assumed propagation speed in the medium. The objects are attained by improved propagation speed determining apparatus which comprises a first pair of acoustical energy transducers, separated a known distance from one another and affixed to one of the objects. First computing means in the apparatus generates an output signal related to the known distance between these transducers. The first computing means output signal is generated using the measured transit times and an assumed or nominal propagation speed value. A signal generating means generates an output signal whose value is a mathematical function of the known distance. The first computing means output signal and the signal generating means output signal are used by a second computing means for calculation of a corrected propagation speed value, without use of external transducers and circuitry.
BRIEF DESCRIPTION OF THE DRAWINGS Other objects and advantages of the invention will become apparent upon a reading of the following detailed description and upon reference to the drawings in which:
FIG. 1 is a perspective view of a portion of a line-ofsight determining system with which the present invention may be used;
FIG. 2 is a drawing of a Cartesian coordinate system showing acoustical energy transducer locations so that the geometry underlying the line-of-sight determining system of FIG. 1 may be better understood;
FIG. 3 is a simplified block diagram representation of an ultrasonic line-of-sight determining system in which the propagation speed determining apparatus of the present invention may be applied;
FIG. 4 is a block diagram illustrating one embodiment of the propagation speed determining apparatus of the present invention and the way in which it may be used to provide propagation speed values for a line-ofsight determining system; and
FIG. 5 is a flow chart of a propagation speed correction algorithm for use in a computer utilizing the method of the present invention.
While the invention will be described in connection with a preferred embodiment and method, it will be understood that the invention is not limited to the process or embodiment described. On the contrary, all alternatives, modifications and equivalents within the spirit and broad scope of the invention as defined by the appended claims are covered.
DETAILED DESCRIPTION OF THE INVENTION FIG. 1 shows the basic external mechanical elements of a line-of-sight determining system using acoustical energy transducers. In FIG. 1, an observer is shown wearing a helmet 12. Helmet 12 has a convex visor 14, on which a reticle pattern 16 is projected. The reticle pattern 16 may be a collimated image which appears to observer 10 to be superimposed at infinity on the scene of the outside world. It is not essential to the line-ofsight determining system that such a visor reticle pattern be used. A conventional cross hair sight could also be used. Two acoustical energy transducers l8 and 20 are affixed to helmet 12. While the system could be operational with either transmitters or receivers, for simplicity in discussion an embodiment with transmitters on the helmet is described here. In one successful lineof-sight determining system built and demonstrated, these transmitters were ultrasonic transducers having a resonant frequency of 75 KHz.
Transmitters l8 and 20 are separated by a known distance S. This means that in mounting the transmitters to helmet l2, care is taken to place them a predetermined distance from one another.
In addition to being placed a predetermined distance from one another, transmitters 18 and 20 are also placed in a predetermined relationship with respect to reticle pattern 16. Transmitters l8 and 20 are placed so that a straight line joining the centers of their surfaces will be parallel to a line-of-sight 22 of observer 10, which line of sight is defined by the reticle pattern and one eye of observer 10. It is not necessary to an operative system that the line defined by the centers of transmitters l8 and 20 be parallel to the line-of-sight 22, but it is essential that a defined predetermined angular relationship between these two lines exist. Lineof-sight 22 is represented in FIG. 1 by an arrow marked LOS". Through the remainder of this specification, LOS" will be used to refer to the term line-of-sight. This acronym is well known in the LOS determining system art.
Also present in FIG. I is an acoustical energy transducer assembly generally designated 24. Acoustical energy transducer assembly 24 includes three transducers 26, 28, and 30. In the particular embodiment shown, these transducers will be receivers 26, 28, and 30. Assembly 24 is shown attached to a surface, which represents the reference object with respect to which LOS of the observer is defined. In a typical application of the system, the acoustical energy transducer assembly 24 is mounted to a portion of an aircarft cockpit and the observer I0 is an aircraft pilot.
In FIG. 1 a set of three alternately dotted and dashed lines emanate from each of the transmitters 18 and 20 and terminate at receivers 26, 28, and 30. These lines represent pulsed acoustical energy. signals which are transmitted from each transmitter and received at each of the three receivers. During LOS determining system operation, the transit or propagation times required for these signals to travel from a transmitter to each of re ceivers 26, 28, and 30 are utilized by an associated computer for calculation of the coordinates of each of transmitters l8 and 20. In order to calculate these coordinates, the propagation speed of the signals as well as propagation time must be known. The propagation speed determining apparatus of the present invention yields the propagation speed required for the calculation of these coordinates and LOS.
FIG. 2 shows the geometrical relationship between transmitters l8 and 20 mounted on one side of helmet l2 and the triad of receivers 26, 28, and 30 which are included in assembly 24. In FIG. 2, a right-hand Cartesian coordiante system appears. The positive X, Y, and Z axes of this coordinate system are labelled. For ease in understanding the relationship of this coordinate system to the observer, helmet, and assembly shown in FIG. 1, each axis is marked with the direction which observer 10 would attribute to it. The positive X axis is marked (forward)" since it points generally straight ahead of observer 10. Similarly, the positive Y axis is marked (right)" since it extends toward the righthand side of observer l0, and the positive Z axis ia marked (down)" since it extends in a direction observer 10 would identify as down.
In FIG. 2, each of the acoustical energy transducers shown in FIG. I is represented by a point in the coordinate system. The points representing these transducers are labelled with the same reference numerals used in FIG. 1. In addition to the coordinate location of each transducer in FIG. 2 is indicated in parentheses adjacent the point representing the transducer. Transmitter 18 is located at the head of an arrow marked LOS. This arrow, although not coincident with LOS 22 of FIG. 1, is so marked because the line between transmitters l8 and 20 is parallel to LOS 22 and therefore will have the same angular relationship to the coordinate system of FIG. 2 as actual LOS 22. Transmitter 18 is shown located at coordinate location (X,,, Y,,, Z,,). At the tail of the LOS arrow is transmitter 20, located at point (X8! Y8! The positions of the three receivers in assembly 24 have been chosen with coordinate locations which simplify the computation of positions of transmitters l8 and 20. Located at the origin of the coordinate system of FIG. 2 is receiver 26. The other two receivers are located in the XZ plane at an X coordinate of X and at Z coordinates of i Z,,. Receiver 30 appears at the point (X 0, Z,,). Receiver 28 appears at the point (X 0, Z
Emanating from transmitter 18 are three dashed lines 11,, d and d These lines represent a pulsed acoustical energy signal sent from transmitter 18 outward and received by each of the three receivers 26, 28, and 30. Since the propagation speed is essentially constant over the short distance between the transmitters and receivers, the length of these lines is proportional to the propagation time required for them to reach the receivers. Three lines d d and d also emanate from transmitter 20. These lines are shown as dotted lines to distinguish them from the dashed lines representative of signals emanating from transmitter 18. They also terminate at the three receivers. These lines are representative of the distances between transmitter 20 and receivers 26, 28, and 30 respectively.
Using the apparatus as described in H6. 1 and the geometry as shown in FIG. 2, the operation of a LOS determining system and the need for an accurate value of propagation speed in such a system may be explained.
The calculations necessary to transform the transit or propagation times into transducer coordinates and LOS direction cosines will now be described. A general expression defining the distance between two points in a Cartesian coordinate system is where D P is the distance between two points P and P the point P, has coordinates (X Y,, 2,) and the point P has coordinates (X Y Z Utilizing this expression, the distance between a transmitter and the three receivers can be calculated from knowledge of their coordinate locations. For transmitter 18, as shown in FIG. 2, the distances (1,, d and d may be expressed as follows:
da A 1Yo) YA2 (ZA+Z0)2 4. By appropriate substitution and algebraic solution, the coordinates of transmitter 18 may be obtained in terms of the known and unknown distances:
Using (5) and (6): YA z z 2 1/2 7.
However these coordinates are still expressed in terms of distances. As has been previously explained, the systern measures transit times. A transit time may be converted into distance by the use of the expression (11 CNtl 8.
where d, is the distance between a transmitter and receiver, t, is the time measured by the system for the pulse to be transmitted from the transmitter to the receiver along the path d,, and C is an assumed propagation speed of the signal. Using this well-known relationship and making substitutions into the equations for the coordinates of transmitter 18 yields XA C [21 [2 'T' ta /4X [X02 Zo /2X0] 9.
The coordinates of rear transmitter 20 are established using similar equations. From these equations, direction cosines of the LOS may be computed using the computed transmitter coordinates and the known separation between them. These direction cosines are given by the expression where A A A; are the direction cosines of the angle between the LOS and each of the coordinate axes, and S is the distance between helmet transmitters l8 and 20.
The direction cosines of the LOS may then be used by a system computer to control the pointing direction of weapons or visual aids such as low-light-level TV cameras or other optical sensors so that the weapons or aids are slaved to the observers LOS. It is apparent from equations (9), (l0), and (11) that knowledge of the propagation speed of acoustical energy is extremely important in the calculations made by an LOS determining system. Because the LOS determining system is often used in places where temperature and pressure vary significantly this propagation speed also varies by an amount objectionable in an LOS determining system. The present invention supplies this need with a method and means for obtaining a propagation speed of acoustical energy in the medium between the receivers and transmitters. FIG. 3 is a simplified block diagram of an LOS determining system of the type shown in FIG. 1, illustrating the function and connection of the propagation speed determining apparatus.
In FIG. 3, a rectangular block identified with reference numeral 36 represents acoustical energy receivers and associated filters used to identify signals received from the acoustical energy transmitters. At the top of block 36 are three annular sections which represent three receivers similar in function to the receivers 26, 28, and 30 shown in FIGS. 1 and 2. Receivers and ti]- ters block 36 functions to receive and filter the acoustical energy signals, and transmit the filtered signals to pulse detection circuitry 40. Three arrows connecting receivers and filters block 36 with pulse detection circuitry 40 represent connective links transmitting received and filtered pulses from the three receivers of block 36. Pulse detection circuitry 40 detects a precisely defined portion of each acoustical energy signal (for example, a certain peak or zero-cross) and generates a logic signal at one of its outputs upon such detection. Three outputs of pulse detection circuitry 40 are connected to start/stop logic block 44. The three logic signals transmitted to logic block 44 via the connections are used by logic block 44 to generate stop signals for each of three counters in an oscillator and counters block 46.
Each of these counters was previously started by a start signal from the start/stop logic. The start signals are transmitted to the oscillator and counters 46 through a connective link 48.
A signal which is precisely timed with the start signal sent to the oscillator and counters 46 is transmitted via a connection 50 which connects start/stop logic 44 to transmitter drive electronics 54. The transmitter drive electronics include a transducer excitation programmer which provides drive pulses for each transmitter and associated logic used to sequence the pulses for alternate excitation of the transmitters. The signal transmitted via connection 50 is used to actuate the transducer excitation programmer in transmitter drive electronics 54. The drive pulses are provided through a connective link 56 to an ultrasonic transmitters block 60. Ultrasonic transmitters block 60 has two appendages which represent transmitters mounted on the object whose orientation is being determined. The drive pulses received by transmitters block 60 drive pulse transformers within transmitters block 60.
When a drive pulse or train of pulses is provided to a pulse transformer associated with a particular transmitter, the transformer generates an excitation signal for the transmitter, which responds thereto by emitting several cycles of ultrasonic frequency acoustical energy. The emitted acoustical energy signal is sensed by the receivers of receivers and filters block 36, precisely detected by the pulse detection circuitry in pulse detection block 40. A stop pulse generated by start/stop logic 44 is used to stop the counters which were started in synchronization with transmitter excitation.
The result is that the counters measure transit times from one of the transmitters to the three receivers. Since the drive to the transmitter is sequenced, first one then the other of the transmitters will be excited. The information in the counters is provided to a computer 64 so that three transit times are recorded. The counters in oscillator and counter block 46 are then reset and are ready to record the transit times from the other transmitter. In this way, the six transit times necessary to determination of the coordinate locations of the transmitters with respect to the receivers are collected by the system of FIG. 3.
Computer 64 receives signals representative of the transit times measured by oscillator and counters 46 through a set of three connective links shown as arrows in FIG. 3. These signals are provided to computer 64 after each transmission and receipt of a pulsed signal from one of the transmitters 60. Therefore, two sets of three signals each are received by computer 64.
Computer 64 is programmed to solve equations of the form shown in expressions (9) (l 1). These coordinates are calculated using a value for propagation speed, which is either an assumed nominal value for signals in the medium or a value which was used for the previous LOS computation performed by the system. In the subsequent discussion of propagation speeds appearing in this specification, the symbol C shall refer to this assumed nominal value or value used by the system for a previous LOS calculation. On the other hand,
the symbol C shall refer to a propagation speed determined using the method or apparatus of the present invention. Utilizing this programming and the six signals received, computer 64 calculates coordinates for the front and rear transmitters of ultrasonic transmitters block 60. Computer 64 is also programmed with a signal whose value is representative of the distance S between the two ultrasonic transmitters. Once the six coordinates of the two ultrasonic transmitters have been calculated by computer 64, these coordinates may be used in conjunction with the known distance S between the transmitters to calculate the direction cosines of the LOS of the observer.
It is apparent from inspection of equations (9) I I) that a value for the square of the propagation speed of acoustical energy, C is used for calculation of each of the six coordinate values used in calculating direction cosines. The present invention provides an accurate value of the square of the propagation speed for acoustical energy for use in this computation. A connective link 66 in FIG. 3 transmits signals A,, Z,,, A, representative of computed direction cosines of the LOS to a computer block 68. These direction cosines have been calculated using propagation speed C Computer block 68 computes a unit vector A utilizing the direction cosines of the line of sight. The unit vector A is defined by the expression A A, A +A I5.
It will be apparent from inspection of the equations for the direction cosines A A,,, and A that the unit vector A is a fraction whose numerator is the calculated distance between transmitters 60 and whose denominator is the known distance S. In view of its calculation of A computer block 68 may be said to generate a signal related to the known distance 5 utilizing the transit times and an assumed propagation speed. However, any signal from which the calculated distance between transducers could readily be obtained would be sufficiently related to the known distance for the purpose of the present invention.
If the value of propagation speed C is accurate, the computed value of A will be unity. If an error exists in the quantity C it has been discovered that A the unit vector length, will vary in a nearly proportional manner. Using this discovery, a simple iterative algorithm for propagation speed determination is CN+I2 CV2 o) 1 where C is an improved value of propagation speed for use in a subsequent computation of line of sight.
Returning now to a description of FIG. 3, computer block 68 transmits a signal representative of the value of A to correction circuitry 72. Correction circuitry 72 receives from a connection 74, a signal representative of the valve of C the square of the assumed nominal or previously calculated propagation speed. Using equation (16), correction circuitry 72 generates a new value for propagation speed, C and transmits a signal representative of C on a connection 76 between correction circuitry 72 and computer block 64 for use in subsequent computation. In a typical system such as that diagrammed in FIG. 3, this calculation of direction cosines followed by computation of a new value of propagation speed need only be repeated once during each LOS computation, since LOS computations are closely spaced in time and use of equation (16) or a closely related algorithm results in a rapidly converging iterative solution for propagation speed.
FIG. 4 shows in more detail a block diagram ofa particular embodiment of the propagation speed determining apparatus. At the left side of FIG. 4 are three input terminals 80, 82, and 84. Terminals 80, 82, and 84 receive signals representative of the direction cosines of the line of sight. Each terminal receives one of the cosine signals. For convenience and clarity of explana tion, each terminal has been labelled with the symbol previously used to denote one of the LOS direction cosines. Thus input terminal 80 is labelled with A representative of the X axis direction cosine, input terminal 82 is labelled with Ay, representative of the Y axis direction cosine, and input terminal 84 is labelled with A representative of the Z axis direction cosine.
The direction cosine signals present at input terminals 80, 82, and 84 are supplied each to one of the three squaring circuits 86, 88, and 90. The squaring circuits 86, 88, and 90 function to produce output signals representative of the square of their received input signals. Squaring circuit 86 is connected to receive the signal from input terminal 80 and produces a signal representative of the square of that signal at its output. In a similar manner, squaring circuit 88 is connected to receive the signal present at input terminal 82 and square it, presenting the squared signal at its output. Finally, squaring circuit 90 is connected to input terminal 84. It receives the signal from input terminal 84, squares that signal, and presents a signal representative of the squared signal at its output.
The outputs of the three squaring circuits 86, 88, and 90 are connected to three negative polarity inputs of a four input summing junction 92. A fourth input which sums its received signal with a positive polarity is connected to a function generator 94. Summing junction 92 adds the negative magnitudes of signals received at its negative polarity inputs with the positive magnitudes of signals received at its positive polarity input. The output of function generator 94 is a signal representative of the integer one. Summing junction 92 has an output 96. At output 96 of summing junction 92, a signal equal to the quantity (1 A is provided, with A being defined as in equation The circuitry of FIG. 4 to the left of output 96 is enclosed in a dashed line block designated 68. This relates it functionally to the system of FIG. 3. This portion of the FIG. 4 computes a value representative of the unit vector A In the specific embodiment of FIG. 4, the quantity (1 A is calculated by the circuitry of block 68 to take advantage of two approximations which have been found to result in significant computation time saving in embodiments of this invention utilizing a digital computer.
The origin of these approximations shall be briefly described. As previously mentioned, equation (16) provides a useful algorithm for determination of an improved propagation speed value. Because propagation speed variations are small when compared to the speed itself, two approximations can be made. For small values of e and a the following expressions are true:
(l/l+a) E (l a) Using these two relationships, we define (l e) as equal to A This means e A 1 and Substituting this approximation into equation (16) gives CN+12 CNZ A02/2) 22. Using such an approximation will substantially reduce the calculation time for the algorithm in digital computer mechanizations of this invention.
In practice it has been found that due to significant sensitivity of the system to data scatter or noise, the system output using expression (22) may exhibit small oscillations around a mean value. To eliminate this, the propagation speed determination correction for a single iteration was halved. This was done by multiplying the value of a used in relationships (21) and (22) by one-half. The resultant algorithm used for propagation speed determination is This basic algorithm is mechanized in apparatus shown in block diagram form in FIG. 4. It will be well understood that any algorithm essentially using the relationship defined by equation 16) will be successful in achieving improved propagation speed values.
Returning now to a description of FIG. 4, the output 96 of summing junction 92 transmits a signal representative of the value lA Output 96 is connected to a first input 100 of an electronic multiplier 102. Multiplier 102 has a second input 104. The fraction onequarter appearing to the right of input 104 indicates that the product obtained by multiplier 102 in multiplication of the signals at inputs 100 and 104 is scaled by a factor of one-quarter. A terminal 106 is connected to input 104. Terminal 106 is provided with a signal representative of Q}, the square of a nominal or previously used propagation speed value. A first value for C would normally be pre-programmed or pre-set into the system. Subsequent values might be obtained during successive LOS computations.
Intermediate terminal 106 and input 104 is a junction point 108. The signal representative of C is presented at input 104 and a signal representative of the quantity 1 A is presented at the input 100 of electronic multiplier 102.
Electronic multiplier 102 functions to multiply the received signals, adding a scale factor of one-quarter. Multiplier 102 has an output 114 at which an output signal representative of the quantity C multiplied by l A /4 is present. Output 114 is connected to a positive polarity input 116 of a summing junction 120, a second positive input 118 of which is connected to junction point 108. Input 118 receives a signal representative of C Summing junction 120 has an output 122. At output 122, a signal representative of the sum of C and the quantity C (1 A /4) will be generated.
This is a new propagation speed C which may then be transmitted to the computer 64 for use in a more accurate determination of LOS direction cosines. The portion of the circuitry in FIG. 4 from the input 100 to the output 120 is surrounded by a dashed line block 72. This identifies it as performing the function of correction circuitry 72 shown in FIG. 3, and relates it to the system of FIG. 3.
In practice, a first determination of LOS direction cosines accomplished by computer block 64 of FIG. 3 will normally be followed by determination of a more accurate propagation speed, then by re-determination of direction cosines utilizing the new propagation speed. If LOS computations are closely spaced in time, only one iteration may be required. On the other hand, if measurements are only occasionally taken, three or four recomputations may be required to obtain an accurate LOS value.
FIG. 4 has shown a block diagram of one embodiment of the propagation speed determining apparatus. The invention may also be mechanized by use of a properly programmed digital computer in combination with certain system elements to generate improved propagation speed values.
FIG. 5 illustrates a flow chart for a propagation speed determining algorithm. The flow chart may be used for programming a digital computer to perform the calculations performed by the circuitry shown in FIG. 4. The algorithm in FIG. 5 contains features not shown in the mechanization of FIG. 4. The maximum and minimum values of the propagation speed squared are limited in the flow chart of FIG. 5 by a decision making loop. This feature keeps certain failures in the propagation speed determining system from causing the LOS determining system to completely lose its utility. For example, if an electronics failure caused a malfunction in block 68, the block which computes the unit vector A the system might generate a value of the square of the propagation speed totally unrelated to the actual value. The decision loop shown in the flow chart of FIG. prevents this problem from rendering the LOS determining system completely useless. The second feature achieved using the flow chart shown in FIG. 5 is limitation ofthe maximum percentage change in propagation speed accomplished by one iteration. This feature ensures the propagation speed value will converge smoothly to the actual propagation speed.
In one embodiment of an LOS determining system using an algorithm similar to that of FIG. 5, the propagation speed squared (C and the percentage change during one iteration (m) were defined as follows:
Proceeding now to a description of FIG. 5, a parallelogram labelled 150 represents loading of the direction cosine values A into an X register, A, into a Y register, and A into a Z register. These direction cosine values will be available from a computation using the last determined propagation speed value. The first operation performed in the flow chart is labelled 152. It represents squaring of the contents of the X register and loading of that squared value into the X register. This will provide the X register with the expression A Operations labelled 154 and 156 are identical in nature to operation 152 calculating and loading the values A A into their respective Y and Z registers. An operation 158 in the flow chart takes the contents of each of the three registers X, Y, and Z, sums them and loads the sum into the X register. This effectively loads the X register with the quantity A The next operation is labelled 160. This amounts to calculating l minus the contents of the X register, that is, l A shifting the binary point two places to the right which, since this is a binary system, effectively divides by four, and loading the result into the X register. The operations thus far produce a signal similar to the signal at the output of summing junction 92 in FIG. 4 except that the shift of two has already multiplied l A by one-quarter. The next step or operation in the flow chart is a decision operation 164, which determines whether or not the contents of the X register are equal to or greater than M As previously described by equation, M is the maximum change allowed in one iteration by the propagation speed determining method shown in FIG. 5. If the contents of the X register are greater than or equal to M M is entered in the X register. A flow arrow 166 indicates that in the case of a YES decision, where the contents of X are greater than or equal to M the next step in the flow chart will be dictated by following arrow 166. Arrow 166 leads to an operation 170. Operation 170 consists of loading the value M into the X register. A flow arrow 172 then merges with the flow arrows followed in the event of a NO decision at operation 164.
If a NO decision is made at decision operation 164, a flow arrow 174 defines the next operation. Flow arrow 174 is connected to a diamond representing a decision operation 176. Whereas decision operation 164 provided an upper bound to the change in propagation speed resulting from the iteration, the decision operation 176 provides a lower bound. Decision operation 176 determines whether the contents of the X register are less than or equal to M If the decision is NO, a flow arrow 180 is followed. If the decision is YES, the contents of the X register are more negative than the quantity M In that case arrow 178 is followed to an operation 182, which loads the quantity -M into the X register. A flow arrow 184 then returns the program to arrow 180, and arrow 172.
Flow arrows 172, 180, and 184 direct the program to an operation identified by reference numeral 190. This operation takes the contents of the X register, multiplies them by a value C a previously determined or assumed propagation speed, and loads the product into the X register. A shift of one place to the right is required at this point merely to keep the binary point in the right place in the multiplication process. A flow arrow runs from operation to an operation designated by reference numeral 192. Operation 192 takes the contents of the X register, adds the quantity C and loads the result into the X register. As indicated by the designation 8-19 to the right of operation 192, a substantial shift of binary point is necessary to line up the binary points in the contents of the X register and C to perform the addition operation. The new value of propagation speed has now been calculated. It is equal to C plus the quantity (lA /4) C The remainder of the flow chart deals only with the feature which limits the minimum and maximum values which the square of the propagation speed may assume.
This portion of the flow chart operates in essentially the same way as the portion which bounded the percentage change in propagation speed for one iteration. A decision operation 200 determines whether or not the contents of the X register are greater than or equal to C If the decision is YES, the value C is entered in the X register using a leg of the flow chart marked 210. If the decision is NO, the contents are checked for minimum value in a decision operation 214. If the contents ofthe X register are less than C C is loaded into the X register via a leg of the flow chart identified as 220. If not, a flow arrow 224 defines the next step in the method. Legs 210, 224, and 220 converge at an operation block identified by reference numeral 228. This loads the contents of the X register into a register labelled C which is a new calculated value of propagation speed. This value could then be used in a system of the type illustrated by FIG. 3 to recalculate direction cosines of the LOS in computer 64.
While the flow chart shown is refined and specific, it will be apparent to those skilled in the art that any flow chart or process corresponding to a flow chart which mechanizes a determination of propagation speed by multiplying a previously assumed nominal speed by the ratio of a computed length in the system to a known length in the system achieves the desired result. In addition, it is not necessary that the propagation speed determining apparatus be applied in an LOS determining system. Any system which uses acoustical energy signals to make measurements of distance or velocity and requires a propagation speed value for its operation, might apply the present invention.
The method and apparatus for propagation speed determination as shown in FIGS. 4 and 5 operates without the use of receivers and transmitters separate from the primary system transducer used for distance or orientation measurement. It also operates without the use of complex external circuitry used in the prior art for determination of propagation speed.
Thus it is apparent that there has been provided in accordance with the invention a method and apparatus for propagation speed determination that fully satisfies the objects, aims, and advantages, set forth above. While the invention has been described by the use of specific embodiments thereof, it will be evident to those of skill in the art that many alternatives, modifications and variations are available in light of the foregoing description. Accordingly, this is intended to embrace all such alternatives, modifications, and variations as fall within the spirit and broad scope of the appended claims.
What is claimed is:
I. An apparatus which determines relative spatial orientation of two objects in a medium utilizing acoustical energy transducers positioned on each object, means for transmitting acoustical energy from transducers on one object to transducers on the other, means for measuring transit times required for propagation of acoustical energy between transducers on one object to transducers on the other object, and means for calculating relative spatial orientation using the transit times and an assumed propagation speed in the medium, the improvement which comprises:
a. a first pair of transducers spaced a known distance from one another and affixed to one of the objects;
b. first computing means for generating an output signal related to the known distance utilizing said transit times and said assumed propagation speed;
c. signal generating means for generating an output signal whose value is a mathematical function of the known distance; and
d. second computing means, responsive to the output signals generated by said first computing means and said signal generating means, for calculating therefrom a corrected propagation speed for acoustical energy in the medium.
2. The apparatus of claim 1 wherein said first computing means generates a signal proportional to the distance between said first pair of transducers which would be obtained by computation utilizing said assumed propagation speed and the time required for propagation of acoustical energy between said first pair of transducers and the transducers on the other object.
3. The apparatus of claim 2 wherein said second computing means calculates said corrected propagation speed by multiplying said assumed propagation speed by a value approximately proportional to the square root of the ratio of the first computing means output signal to the signal generating means output signal.
4. The apparatus of claim 1 wherein said second computing means calculates said corrected propagation speed substantially in accordance with the equation V l V (MAUI/2 where V, the corrected propagation speed;
V, the previous assumed value of propagation speed; and
A a unit vector length calculated by said first computing means using computed coordinates for said first pair of transducers.
5. In a line-of-sight determining system utilizing signal generating transducers mounted on a helmet and reference frame, including means for sending signals between the transducers and means for calculating direction cosines of the line-of-sight based on propagation times for signals transmitted between said helmet and said frame and an assumed signal propagation speed, the improvement which comprises:
a. signal generating means for generating a signal representative of the square of a unit vector length utilizing the direction cosines so calculated;
b. computing means having an input, for correcting the square of said assumed signal propagation speed by multiplying said assumed signal propaga-- tion speed by the inverse of a value supplied as an input to said computing means; and
c. means for supplying the value represented by the signal generated by said signal generating means at the input to said computing means.
6. The apparatus of claim 5 wherein said signal generating means generates a signal having a value representative of the quantity (3-A /2) where A,, the sum of the squares of said calculated direction cosines of the line of sight.
7. The apparatus of claim 5 wherein said signal generating means generates a signal having a value representative of the quantity (5A /4) where A, the sum of the squares of said calculated direction cosines of the line of sight.
8. A method of improving the accuracy of a nominal speed of sound value for use in a sonic energy relative orientation determining system having transducers mounted a known distance apart on a first object whose orientation is to be determined and three transducers mounted in known orientation on a second object with respect to which the orientation of the first object is to be determined, which comprises the steps of:
a. calculating the distance between the transducers on the first object using transit times for signals transmitted between the transducers mounted on the first and transducers mounted on the second object and a nominal speed of sound value;
b. dividing said calculated distance by said known distance; and
c. correcting said nominal speed of sound by an amount approximately proportional to the square root of the quotient obtained by said division.
9. The method of claim 8 wherein the step of correcting said nominal speed of sound includes the substeps of a. multiplying the square of said nominal speed of sound value by a number proportional to (3A,, /2) where A, is the quotient obtained by said division;
b. calculating the square root of the product obtained by said multiplication;
c. dividing said calculated distance by said known distance; and
d. correcting said nominal speed of sound by an amount approximately proportional to square root of the quotient obtained by said division.
10. The method of claim 8 wherein the step of correcting said nominal speed of sound includes the substeps of a. multiplying the square of said nominal speed of sound value by a number proportional to (3-Af/2) where A is the quotient obtained by said division; and
b. calculating the square root of the product obtained by said multiplication.
11. Apparatus for determining the relative spatial orientation of two objects in a medium comprising, in combination:
a. first and second acoustical energy transmitters mounted on a first of the objects a predetermined distance apart;
b. acoustical energy receiving means mounted on a second of the objects and operable to receive acoustical energy transmitted from said first and second acoustical energy transmitters;
c. timing means connected to said acoustical energy receiving means and to said first and second acoustical energy transmitters to produce a first signal indicative of the transit time of the acoustical energy between said first and second acoustical energy transmitters and said acoustical energy receiving means;
d. first computing means connected to said timing means to receive the first signal at a first input and, at a second input, a second signal which is, at least, approximately indicative of the propagation speed of the acoustical energy in the medium, said first computing means producing an output signal which is a function of the spatial orientation of the two objects based upon the first and second signals and the predetermined distance between said first and second acoustical energy transmitters;
e. second computing means connected to said first computing means to receive the output signal therefrom and to produce an output signal which varies with any error in the second signal;
. correction means having a first input connected to said second computing means to receive the output signal therefrom and a second input connected said first computing means to receive the second signal, said correction means producing an output signal which, if an error in the second signal existed, is more nearly indicative of the propagation speed of the acoustical energy in the medium than the second signal; and
g. means connecting the second input of said first computing means to receive the output signal of said correction means.
|Cited Patent
|Filing date
|Publication date
|Sep 3, 1953
|Jul 3, 1956
|Bogue Elec Mfg Co
|Calibrated apparatus for measuring liquid levels
|Jun 6, 1969
|Mar 9, 1971
|Edo Corp
|Heading-sensing apparatus
|Sep 22, 1970
|May 23, 1972
|Nippon Electric Co
|Three-dimensional position indicator and detector device
|Citing Patent
|Filing date
|Publication date
|May 30, 1979
|Apr 14, 1981
|Australasian Training Aids (Pty.), Ltd.
|Shock wave triggered target indicating system
|Jul 10, 1992
|Aug 16, 1994
|Northrop Grumman Corporation
|High speed high resolution ultrasonic position and orientation tracker
|Apr 1, 1992
|Nov 22, 1994
|Grumman Aerospace Corporation
|Three-dimensional computer image variable perspective display system
|Jun 29, 1994
|Feb 27, 1996
|Northrop Grumman Corporation
|High speed high resolution ultrasonic position and orientation tracker using a single ultrasonic frequency
|Sep 23, 1999
|Sep 7, 2004
|The Johns Hopkins University
|Magnetic sensor system for fast-response, high resolution, high accuracy, three-dimensional position measurements
|Oct 21, 1991
|Aug 11, 1993
|Logitech Inc
|Ultrasonic position locating apparatus
|Oct 21, 1991
|Dec 1, 1993
|Logitech Inc
|Ultrasonic position locating method and apparatus therefor
|Aug 8, 1997
|Feb 19, 1998
|Helge Zwosta
|Body sensor system
|U.S. Classification
|367/117, 367/129, 367/902
|International Classification
|Cooperative Classification
|European Classification


text: Comparing Model Comparison MethodsHolger Schultheis, Ankit Singhaniya, Devendra Singh ChaplotCogSci2013Comparison of the ability of different computational cognitive models to simulate empirical data should ideally take into account the complexity of the compared models. Although several comparison methods are available that are meant to achieve this, little information on the differential strengths and weaknesses of these methods is available. In this… (More)


text: Hello there all... Very wisely I have been advised to re-consider full-on freelance during this current credit-crunch...But in trying to make my work/life ballance better I am trying to explore alternative work formats. In particular I am considering the merits of working from home - or more precisely, trying to convince the boss it's a good idea. And so I though a thread to explore this type of design working would be interesting. ISSUE 1 - TRUST: First off - let's be frank. Obstacle one is convincing the boss it's a good idea... What we are talking about is TRUST. But surely there are means whereby one can show the boss that there are ways to accurately verify and monitor work flow at home? Have any of you any thoughts about constructing a system whereby you can manage work flow achievements at home? - Is there special software on online resources that are specifically designed to help the home worker and their studio based management? Cheers, B


text: Also included is the fascinating history of the company and a tour of the Studebaker National Museum. This VHS/NTSC format video tape is in color and is approximately 40 minutes in length. Perfect item or gift for any car memorabilia or automobile enthusiast! Please Click On Image For A Closer Look!


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Drivers injured in Schuylkill crashes
Two drivers were injured in two, one-vehicle crashes, investigated by state police at Frackville on Schuylkill County roads.
A crash was reported at 2:23 p.m. on Tuesday, Nov. 26, along Interstate 81 in Ryan Township. Troopers said Kyle D. Matis, 21, of Carlise, Cumberland County, as driving a 2007 Honda Accord southbound and passed a truck. He then made a lane changed into the left lane in front of the truck. As he made the change he had to brake for another vehicle in front of him. When he braked he lost control of his car on the icy roadway.
The car went onto the west berm and struck an embankment, continuing south along the embankment before striking a tree. The Honda then rolled over several times before coming to rest on its wheels facing north.
Matis was injured and taken to St. Luke's Miners Memorial Hospital, Coaldale, by Ryan Township ambulance. Matis was cited for driving a vehicle at a (un) safe speed.
Troopers investigated a one vehicle crash about 7:44 a.m. on Wednesday, Nov. 27, along SR61 in Blythe Township. Troopers said Brandon M. Donati, 17, of Schuylkill Haven, was driving a 1998 Ford Explorer northbound in the passing lane at a speed greater than prudent for conditions. While negotiating a left curve Donati lost control of the vehicle, which spun 170 degrees counter-clockwise. The Explorer then slid backward across the right lane and onto the shoulder. The Explorer then rolled partially onto the driver's side.
After impact the Explorer bounced off the guiderail, slid across both northbound lanes on its driver's side, then flipped back onto its wheels and came to rest along the west berm against the guiderail.
Donati was injured and taken to the Schuylkill Medical Center-S. Jackson St., Pottsville, by Saint Clair ambulance. The vehicle had to be towed from the scene.
Troopers cited Donati for driving a vehicle at a (un) safe see.


text:
Richie Ramsey crowned Trophee Hassan II winnerMarch 29, 2015 Golf News
Scotsman records fifth professional win and third European Tour title
Richie Ramsay claimed that it was 'his time' after 'taking the tournament by the scruff of it's neck' with his final round 69 (-3) seeing him lift the Trophee Hassan II title by one shot.
After carding four birdies in a row from the third, a triple bogey (6) on the par-3 eighth hole was not enough to derail the Scotsman, who went on to record 10-under for the tournament.
"I just didn't execute the shot exactly how I wanted to," Ramsay said describing his poor sixth hole, "I hit a pure chip, rolled back into a divot, didn't come out, hit it back on, two putts for an easy six," said the 31-year old.
"It's one of those courses that's got so many holes like that, but I knew I was still in the mix and walking down the 9th I was like – I'm still level par – I knew the back 9 very scoreable."
"I made great putts on 9 and 10 just to keep the momentum going. From then on when I stood over a putt – I think it was the 12th hole – I just thought my putter felt absolutely great and I could see all the lines.
It was so much fun out there. It was just absolutely brilliant. "I just thought to myself just go for it this is your time and I pretty much took it by the scruff of the neck over the next two holes.
"To execute the 7 iron on the last was one of the best shots I've ever hit, from visualisation to execution.
"It was just perfect.
This was a miraculous return to form for the Scotsman, who has already missed the cut in four of his five starts this season, and could see the Scotsman move into the top 80 of the Official World Golf Ranking.
"My brother has supported me since I was so young, this one's for him and Angela. I've gone through some tough times with injury and I kept believing," said Ramsay.
"It was so much fun out there. It was just absolutely brilliant."
A late charge from Romain Wattel was not enough to force a playoff, having missed a final hole chip that would have seen the event settled in a shootout.
The 24-year old Frenchman is still looking for his first European Tour victory.
George Coetzee, looking to gain entry to The Masters, finished in a group of six that tied for second on -8, including: Pablo Larazabal, Chris Wood, Mikael Lundberg, Kevin Phelan and Jaco van Zyl.
Spanish veteran Jose Maria Olazabal, 49, who won the Ryder Cup both as a player and captain and also won the Masters` twice, finished strongly with a blistering 66 to finish in a tie for ninth at seven under with four other players.
Full leaderboard details can be found here.
For more golf news, discussion and videos follow @NCGmagazine on Twitter, like us on Facebook, subscribe to our YouTube video channel, and sign up to our newsletter.


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text:
Love Hurts: Hickey Today, Stroke Tomorrow?
Hickey: "… also sometimes called a love bite or kiss mark, is a bruise caused by biting, aggressive kissing or sucking of soft skin, usually around the neck or on the arm. Throughout your body, you have many different types of blood vessels that help transport blood around. The smallest blood vessels in your body are called capillaries. When somebody sucks very hard on soft skin, they can cause the capillaries just beneath the surface to rupture, letting blood seep out into the surrounding tissue. So, hickeys, like bruises, are actually broken blood vessels just under the surface of the skin that blood has come out of. The blood that has collected and clotted under the skin is generally red at first but then, as it is no longer getting oxygen, the blood dries out and turns into a darker purple or brown color."
Source: www.whatisahickey.com
Despite the highly detailed physiological description, hickey's invariably reveal one thing: A round of intense sexual contact. For generations, hickeys have been the singular, tell-tale sign that a sexual encounter included more than simply a chaste kiss. With two consulting partners, a hickey almost always represents vigorous, almost primal love-making, connoting a powerful physical connection between the pair. On college campuses, where individuals probably enjoy more frequent and direct contact with potential sex partners than any other time in life, hickeys are a common sight. Whether one party views them mark as a sign of sexual conquest or pride, or another sees them as signifying deep love and commitment, these brownish-purple markings are practically just another fashion accessory at most universities.
In general, the partner who gives a hickey finds the domination that comes from biting into another person's flesh sexually titillating – and in some cases, a way to show control over the other person. At the same time, lovers who enjoy receiving hickeys likely experience some sexual gratification from an act that can be physically painful and even humiliating. Not surprisingly, the neck, the most common body part to plant a hickey, can be a highly sensitive erogenous zone. The neck, of course, is also the most visible body part after the face. Therefore, displaying a hickey sends a clear memo to onlookers. The neck becomes a virtual message board for passion, regardless of the depth of commitment felt by either partner. While some people are reluctant to reveal such intimate signs to the public, others wear them proudly – even though they would never consider a regular bruise a symbol of beauty or pride. Typically, the less devotion someone feels for the person who left the mark, the more likely she is to try and camouflage it. Make-up concealer can do the trick.
Think hickeys are harmless, particularly on college campuses, where hickeys are a commonplace? Think again.
Yet beyond the glaring appearance of hickeys, and their varied connotations about a couple's relationship, one fact often remains hidden: Not only are they painful, but they can be dangerous. And most students caught up in a heated affair are often unaware of that fact; unlike unwanted pregnancies, STDs and other risks associated with intimacy, both sex education classes and parents trying to inform their budding adolescents tend to ignore the subject of hickeys. Yet hickey's can carry a huge peril. When extremely intense sucking on soft skin causes the capillaries below to rupture, letting blood seep into the surrounding tissue and producing the tell-tale hickey mark, the seepage also can trigger a blood clot. That result can lead to a stroke or even death.
Hickey Horror
Such cases are extremely rare, although two incidents have been reported in the last few years. Last August, a 17-year-old boy in Mexico City began convulsing at dinner with his family a few hours after his 24-year-old girlfriend had planted a large hickey on his neck. Doctors determined a blood clot had formed and travelled to his brain, killing the youth, according to a report in the UK Sun. In 2011, a 44-year-old woman in New Zealand lost movement in her left arm after having a stroke. When doctors noticed the "faded love bite," the Sun reported, they concluded that damage to a major artery in her neck caused the paralysis.
Does this mean you should be afraid of hickeys? No.
Such devastating risks are rare, but lovers should proceed with caution, doctors say. In addition, partners should be aware that visible bruising can last up to two weeks. Moreover, painful swelling due to inflammation can result. In those cases, an ice pack normally alleviates the discomfort. However, if pain persists, sufferers should seek medical attention.
Sexual-related injuries are actually quite common on a day-to-day basis. Hickeys are just one of many sexual exchanges that can cause either physical or psychological distress. Common injuries ranging from unplanned pregnancies and STDs, to torn ligaments and muscles, to broken bones to heart attacks, carnal catastrophes can and do occur in the heat of passion. Who knew love could hurt so much?
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WHEN the transfer window closed at 11pm on August 31, the prevailing mood at Newcastle United was portrayed as one of dejection and anger. Rafael Benitez was frustrated at his employers' failure to land a single player on deadline day; a majority of the club's supporters were furious at what they perceived to be yet more broken promises from Mike Ashley.
Newcastle's players, however, viewed things rather differently. Yes, they had been hoping for some additional competition and a sign of the Magpies' ongoing ambition, but having just won promotion four months earlier, they were also understandably affronted at the suggestion they were incapable of achieving anything without outside assistance.
Hadn't they just overcome the disappointment of relegation to claim the Championship title? Weren't they the best team in the whole of the Football League last season? Didn't they deserve a chance to show what they could do in the top-flight?
Amid the fall-out from the transfer window, Newcastle's title winners refused to buy in to the notion that a failure to recruit at the end of August would inevitably mean a season of struggle. They retain faith in their abilities, and that faith looked justified on Sunday as they moved into the top half of the table courtesy of a 1-0 win over Swansea City.
"People haven't really been talking about the players that were here last season, but that is normal when the window is open," said Ayoze Perez, who was a key part of last term's title triumph, and who has started all four league games this season.
"There are always a lot of rumours about what is or isn't going to happen, and you have to deal with that. There was talk about what players might come in, but we know the team we have and we know how strong we can be.
"We still have to do a lot of work, and we can improve a lot, but we know how good we are. This dressing room has a lot of ambition, and we all have the desire to win games. That is going to be important right the way through the season."
As well as being part of last season's title triumph, Perez was also a member of the squad that was relegated in the previous campaign, and the pain of that experience continues to be a powerful motivating force.
Three members of the side that started at the Liberty Stadium on Sunday were also involved in the relegation campaign – Rob Elliot and Jamaal Lascelles, as well as Perez – while the likes of Chancel Mbemba, Paul Dummett, Jonjo Shelvey, Jack Colback and Aleksandar Mitrovic remain part of the squad.
Perez freely admits he has a point to prove, and his early-season performances suggest he has developed a more rounded attacking game since he was last involved in the top-flight.
"We have players here who went through relegation, and we want to put that right and show what we can do in the Premier League," he said. "We had to go into the Championship and had a tough year.
"Nobody feels good when you get relegated, but we worked very hard to get back into this league. Now we are here, we want to show everyone that we deserve to be here. We have to keep that mentality because it is going to be a long, tough season. We have to keep going in the same way we have been in the last two games."
Having beaten West Ham prior to the international break, Newcastle made it two victories in a row as Lascelles' second-half header broke the deadlock at the Liberty Stadium.
The win was achieved despite the absence of Rafael Benitez, but it is hoped the Spaniard will be back in the dug-out when Stoke City visit St James' Park on Saturday.
Benitez remains in pain following an operation to address an infection following hernia surgery, but while he was not in Swansea in person last weekend, he still had a considerable influence on events.
"Even though we did not have our manager with us, we tried to make it as normal as we could," said Perez. "He wasn't able to be (there), but even if he had been, it would still have been tough. We knew what we had to do, and we did it well.
"We had a little conversation before the match, where he was saying some key things. Then after that, the rest of the staff did great work. They made sure that we controlled everything."
Last season, Newcastle nurtured a winning mentality throughout the campaign as they clinched the Championship title. It is obviously much more difficult to win matches in the top-flight, but the momentum carried over from promotion remains an important asset.
"We have two wins a row, but the most important thing is that we are still working on what we have to do," said Perez. "We know the mentality we have to have, and that is important. The results are going to give us some confidence, and now we are playing at home in front of our fans, which is always great. We will see what happens then."


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This true crime book follows the FBI's search for and capture of Darren Dee O'Neall, a serial killer whose ability to change his appearance kept him out of the reach of the authorities, and describes his violent sexual crimes.
For women with a yen for macho men, Darren Dee O'Neall seemed the kind of guy romantic dreams were made of. Strong, handsome, smooth talking, with an array of tattoos adding to his masculine aura, he came on as a rugged outdoorsman looking for a mate. But in reality, O'Neall was a nightmare of savage, sexually violent crimes that put him on the FBI's most wanted list. Here is the bone-chilling true crime story of the twisted killer whose masterful ability to change appearances confounded authorities again and again...and a mother's agonizing search for her missing daughter. It is the story, too, of the brilliant police work and startling psychic detection that teamed with a family's outrage to bring him to justice. But it was too late for the young woman whose dream of a hunk "to die for" became a chilling reality!
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The Louis L'Amour Killer...
- Polly Poizendem
Solid True Crime
As a lover of true crime and stories of the supernatural/fiction variety, I really enjoyed this book! That said, the "paranormal" elements to this book are so minimal (and honestly, seemed more like the reaction of a grieving family trying to make sense of a tragedy than anything other worldly) I wouldn't have even mentioned it in the subtitle.
This is a heart wrenching tale of a sadistic killer who eludes authorities based on his ability to change his appearance. Gary C. King spares us no details and the details are pretty gruesome. I found the "after hours party" scene that took place at a strangers house to be particularly chilling. In my youth, I attended parties where I barely knew anyone and where I could have easily fallen prey to a stalker such as Darren O'Neall. These parties happen. These killings happen. This idea plays out throughout this book and it is truly haunting. I would recommend this book to any true crime lovers!
I was voluntarily provided this free review copy audiobook by the author, narrator, or publisher.
- Tad B.


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Although I was still full from the previous night's dinner, I went to LOS for lunch. Spicy seafood soup (with high quality hunks of red snapper), my beloved hoh mok plar (curry-pasted eggs, cabbage, and catfish. Also a little amuse of green papaya salad with little pieces of fresh, charbroiled shrimp instead of the usual dried crab or shrimp. What can I say? It was all great.
Dinner at Nora's Wine Bar & Osteria at 1031 South Rampart Blvd., the Summerlin cousin of the original on West Tropicana. I've only been able to find one recommendation for it on Chowhound, from Paul Carelli. I'm a little surprised it has gotten so little attention here, as both locations are immensely popular.
I found elements of the place annoying. Reservations seem to be invariably worth only a shorter wait. Upselling begins as soon as you meet your waiter, at least ours, who was rather smug. And they were out of two of the three entrees we ordered.
Nora's offers a huge list, with 60 wines by the glass, and three- and six-ounce pours (with no penalty for the smaller size -- nice). The bar was mobbed, as was the communal dining table.
We ordered the Margherita pizza as an appetizer. The crust was an abomination, and the cheese relatively tasteless and applied too liberally. But I liked the sweet and piquant tomato sauce, and this turned out to be a foreshadowing of things to come. I loved my spaghetti with bottarga, particularly the roasted tomato sauce. My friends both ordered penne alla vodka. One was wild about it, the other kept stealing my spaghetti, as it was the first time she ate bottarga and she was smitten. The vodka sauce was a little creamy to my taste, but it was well prepared.
I had lunch today at Hue, which, despite its name, is primarily Vietnamese. At lunch, bahn mi are the main attraction for takeout orders, but the majority of folks who ate in were eating more substantial fare. I loved my bahn mi, the house special with beef, pork and wonderful sausage. The vegetables were fresh and pristine, and the bread was perfect. Nothing radical or different about Hue's bahn mi's -- just impeccably done. More surprising was the quality of the mango slushy -- it straddled that fine line between juice and dessert admirably.


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NOTE: Due to the nature of our manufacturing process, none of the planks are textured or stained on the Back. ALSO, depending on the specific Product, sides and ends may also not be textured or stained (i.e., texture and stain on Plank Face Only). Please refer to the product specifications and the pictures in the Close Ups for explanation/detail
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The A-Lift is the signature procedure of the Almonte Center for Facial Cosmetic Surgery. A facelift, also known as a rhytidectomy, is recommended for patients with decreased elasticity in the skin due to age, changes in weight, sun damage or emotional stress. Dr. Almonte's A-Lift reduces the appearance of jowls, smoothes out loose skin on the face, tightens the underlying tissue and removes excess fat creating a more defined jaw line and youthful face and neck profile. As a result, your face will appear firmer and more refreshed.
Some of the most visible signs of aging first appear on the face. Although the changes appear gradually, there may come a day when you look in the mirror and decide that the face you see doesn't reflect the way you feel about yourself.
View Results Gallery
Facelifts are most commonly performed on patients in the 40-60 age range. However, the procedure can produce good results for people in their 60s, 70s and 80s as well. You may be a good candidate for a facelift if you have any of the following types of conditions:
Facelift surgery needs to be approached with extra caution if you have any of the following medical conditions:
Find out if you're a good candidate
The First Step
A personal consultation is the first step for every patient considering a facelift. During this meeting, Dr. Almonte will assess your physical and emotional health and discuss your specific cosmetic goals for surgery.
You should arrive at the consultation prepared to provide complete information about:
If you are overweight and have a realistic desire to lose more that 15 pounds, your weight loss could affect your results. It's important to discuss these plans with Dr. Almonte.
During your physical evaluation, Dr. Almonte will assess your bone structure and the underlying tissues of the face. The thickness, texture and elasticity of your skin and the severity of the wrinkles and folds will also be considered. Your hairline will be examined to determine where incisions can be discreetly placed. All of these factors will be considered in developing your surgical plan.
Dr. Almonte may explain additional procedures that can be performed along with a facelift to meet your appearance goals. For example, a facelift is frequently combined with:
Facelift surgery risks include, but are not limited to:
It is important to remember that despite the best and latest techniques in facial rejuvenation, nothing stops the aging process. Plastic surgery simply tries to slow it down. Your skin continues to age normally, but because of your surgery, your appearance will look better than if you had never had surgery.
Completely Under Local Anesthesia
The goal at the Almonte Center is for our patients to undergo any surgical procedure in the safest manner possible. The facelift has been studied for many decades by many surgeons, and the safest approach is under local anesthesia. Dr. Almonte performs his facelift completely under local anesthesia thus eliminating the risks and complications involved with general anesthesia. During the facelift, the underlying facial muscle known as the SMAS is tightened, then the skin is re-draped and tightened on top of that, thus rendering a lasting result. For most patients, the facelift can be done in one to two hours, and the overall recovery time is around 10 – 14 days. You could be back to work in a couple of weeks. All other facial procedures, such as eyelid surgery, brow lifting, fat grafting, liposuction, or laser can be done at the same time as needed.
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Contact us 24/7: +1 877 678 9627
Needle & Thread
Embroidered silk-organza gown
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Needle & Thread
Embroidered silk-organza gown
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GET EXPERT ADVICE Need a second opinion? Ask your personal shopper:
- - Fits true to size, take your normal size
- - Fitted at the bust and waist, loose at the hip
- - Maxi-length
- - Lightweight, non-stretchy fabric
- - Those with a large bust may wish to take the next size up
- - Model is 177cm/ 5'10" and is wearing a UK size 8
Needle & Thread's delicate silk-organza gown is hand-embroidered with a design inspired by vintage florals. A lace-trimmed internal crepe slip ensures coverage at the sheer top, and the floor-skimming skirt is given volume with layered tulle. Wear yours with a strapless bra.
Shown here with: Jimmy Choo Clutch, Jimmy Choo Sandals, Hervé Van der Straeten Cuff, Hervé Van der Straeten Ring.
- - Black silk-organza, cream crepe and tulle
- - Concealed zip fastening along back
- - 100% silk; 100% nylon; lining: 100% polyester
- - Dry clean
Product Code: 463411
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Product Code: 463411


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News from Office of Coast Survey
Stay up to date with CRSOA
on Social Media!
Legislative Reports
National Data Buoy Center: Operation/Maintenance Schedule can be found here.
National Terrorism
Advisory System
US Coast Guard Maritime Security (MARSEC) Levels
The Columbia River Steamship Operators' Association's (CRSOA) mission is to facilitate trade, provide business leadership, exercise principles of environmental stewardship, serve as an industry focal point, and promote operating policies and practices that are safe, reliable, efficient, and cost-effective.
CRSOA was established in 1922. Its area of influence includes the ports and waterways serving Oregon, southern Washington, and Idaho. It was originally named the Portland Steamship Operators' Association and continued as such until 1994 when the name was changed to reflect a broader venue. Its area of influence includes all the major ports and waterways in the state of Oregon, Southern Washington and Idaho. The Columbia River is the predominant waterway in the region served by the Association.
CRSOA was a major force behind the "Inland Empire" vision for linking Columbia River ports to the international trading community in the 1930's. It supported construction of the locks and dams that made possible navigation eastward over more than 500 miles of river to Lewiston, Idaho and enabled the important interdependency objectives of hydropower, flood control, and "the greening of the desert" to be made real. It was one of the founders of the Maritime Fire and Safety Association in 1984 and played a major role in expanding MFSA to include oil and hazardous material spill prevention, response, and mitigation in the early 1990's.
CRSOA played a major role in keeping the Columbia River open during the "1996 Flood of the Century," and played an even more important role in keeping the Columbia-Snake River System competitive during the extreme low water conditions that prevailed during the August-September time frames in 2000 and 2001. CRSOA also led the industry in the Columbia River Region's response to the 9-11 "Attack on America" and established the Regional Maritime Security Coalition to bring Federal aid to the region for meeting national security mandates and to keep the region competitive in the post-9-11 international trading environment.
Mission & History


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Project Zomboid mods, servers & guides
- by Cyrrent Eiledoll
- 31. Aug 2015
- 4552 views
- 777 downloads
- 3 followers
- 0/5 points (0 votes)
BreakingDead 0.1.1
Walther White meets the walking Dead. Play Braking Bad in Zomboid.
Add an simple Upgrade System for Buildings.
Recipes must be Research.
Tons of new Items and Weapons, realistic Recipes.
New Explosives (drop the Ammonalbomb and RUN!). Make Thermit or Chlorgas.
You can Craft Heavy Weapons like the Flamethrower, the Rocketlauncher or the Microwave Cannon.
Make Homemade Meth in the small Lab and research Blue Meth and the Big Lab.
A little bit Sci Fi ... Research the Zombies and craft Items like Nightvision Injection or Steroids. Learn to make Food from Zombies.
Use some Hydrocraft Textures and Scripts.
Thank you Hydrocraft. No BreakingDead without inspiration from Hydrocraft. (Sorry but i need the textures and scripts)
P.S. Test Version ... some Bugs may be possible.
ChangelogMod now own by HC Team.
Thank you for your attention.
Fix some Recipes
Fix ChargingUnit (now you can read the Book and build one)
Add new Metalworking Recipes (Make SheetMetal, Make Pipe, Make Beam, Make Kitchenstuff)
Add new Books (Tales of a Steelworker, 4 x Metalworking Monthly)
Replace some Textures
Fix some Problems with Dissect and Odd Eyeball
Fix OddFood (Dough to Bread)