text:
## LaTeX forum ⇒ Others ⇒ latex to html via oztex?

Information and discussion about other TeX distributions not listed above; installation, administration; field reports
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### latex to html via oztex?

I've been using LaTeX but downloaded oxtex because it said it could translate to html. But it keeps giving me "permission denied" and I made sure the file and folders have chmod 777. Anybody know what could be the problem?

Also, if there's any better way to get from LaTeX to html I'd be most interested in knowing. I have a book to put in Amazon's Digital Text Platform, but it requires html.
Keep to the Code.

Juanjo
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Also, if there's any better way to get from LaTeX to html I'd be most interested in knowing. I have a book to put in Amazon's Digital Text Platform, but it requires html.

In addition to TtH (which comes with OzTeX), there are several converters from LaTeX to HTML: Hevea, LaTeX2HTML, TeX4ht... You can easily find them googling a little bit. TeX Live (through the MacTeX distribution) provides TeX4ht. This program is used through the command line. There is a simple GUI called SimpleTeX4ht.
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Juanjo wrote:
Also, if there's any better way to get from LaTeX to html I'd be most interested in knowing. I have a book to put in Amazon's Digital Text Platform, but it requires html.

In addition to TtH (which comes with OzTeX), there are several converters from LaTeX to HTML: Hevea, LaTeX2HTML, TeX4ht... You can easily find them googling a little bit. TeX Live (through the MacTeX distribution) provides TeX4ht. This program is used through the command line. There is a simple GUI called SimpleTeX4ht.

Hi Juanjo,

I tried going directly to TtH but can't get that to work either. I'm not proficient at unix commands so maybe I'm giving it the wrong code. Similar for other packages; it seems all the ones I checked require getting into Terminal and doing a lot of things I don't know how to do. But I'll check out that GUI, thanks!

ADDED LATER: Works great! Only thing is it puts special characters (upside down question mark) for all quote marks and certain letter pairs like "ff", "fi", and "ia", and "--". Without that problem it would be perfect. Thanks again!

BTW, in the meantime I just coded a php script to make one that's good enough for now. Only hitch I ran into was how to do a preg_replace that not only finds a string such as
`<tag>variable text</tag>`
, but keeps the variable text inside the string. I'm not good with preg commands either so that's been a problem.
Keep to the Code.

Juanjo
Posts: 656
Joined: Sat Jan 27, 2007 12:46 am

For a simple usage of TtH, copy the binary to the folder where the tex file is, open Terminal, move to that folder (with a cd command line) and launch TtH:
`\$ cd folder_name\$ ./tth file_name`

(tip: write cd on Terminal, then drag and drop the folder there to complete the first of the above commands). Perhaps you should have to provide a chmod command to set permissions of TtH.

Read the adjoint manual of TtH. You should be aware that TtH "understands" many of the core commands of LaTeX, but it skips \usepackage commands and so the commands defined in the packages. You should provide convenient replacements on your own.

In this way, you can compare TtH and TeX4ht and benefit from the best of both.
The CTAN lion is an artwork by <NAME>. Courtesy of www.ctan.org.

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Juanjo wrote:I've downloaded the source code of TtH ... Read the adjoint manual of TtH. You should be aware that TtH "understands" many of the core commands of LaTeX, but it skips \usepackage commands and so the commands defined in the packages. You should provide convenient replacements on your own.
...

Thanks for all your help, Juanjo!

I have no clue how to provide replacements for \usepackage, but when I figure that out I'll be able to try this.
Keep to the Code.


text:
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# Please answer 3rd question using multisim 2-Design an inverting amplifier with a gain of -100 at...

###### Question:

2-Design an inverting amplifier with a gain of -100 at 100Hz. Increase the amplitude of the input signal until you observe clipping. Continue increasing the amplitude and observe the results. Briefly explain and comment your results 3-For the same amplifier as 2, increase the frequency of the input signal until you observe the slew rate characteristic associated with the Op Amp. Try different amplitudes Briefly explain and comment your results. 4- For the same amplifier as 2, reduce the value of R, until the Op Amp will be current limited. Change the amplitude of the input signal. Briefly explain and comment your results. .-.-.-.-.-.-.-. -.-.-.-.-.-.- - - - - - - - - - - - - - - - - - - - -

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##### Point) Consider the following initial value problem; in which an input of large amplitude and short duration has been idealized as delta function:Sy = 6,() ,y(0) = & Y (0) = 0.Find the Laplace transform of the solutionY(s) = (e^-5+8s+40V/(s^2-5s)Obtain the solution ylt) . Remember the Heaviside function notation u(t - c)y(t)1/Sy(t)(e^(St)-1)+8Express the solution as piecewise-defined function and think about what happens to the graph of the solution at t =if 0 <t < 1,y(t)-41/5if 1 <
point) Consider the following initial value problem; in which an input of large amplitude and short duration has been idealized as delta function: Sy = 6,() , y(0) = & Y (0) = 0. Find the Laplace transform of the solution Y(s) = (e^-5+8s+40V/(s^2-5s) Obtain the solution ylt) . Remember the Heavi...
##### In any given week, Michael thinks that the number of staff meetings he holds (X) and the number of sick days his staff takes (Y) might be related: Suppose that the relationship between X and Y is described by the following joint probability distribution: y (Sick days) H 0.12 0.07 0.25 (Meetings) 0.23 0.13 0.03 0.09 0.05 0.03 Calculate the expected value of 444 Do not include any units in your answer:Answer:
In any given week, Michael thinks that the number of staff meetings he holds (X) and the number of sick days his staff takes (Y) might be related: Suppose that the relationship between X and Y is described by the following joint probability distribution: y (Sick days) H 0.12 0.07 0.25 (Meetings) 0.2...


text:
We close the model imposing market clearing. This affects the budget constraint:

$$\begin{eqnarray} k_{t+1} = w_{t} + r_{t+1}k_{t} + (1-\delta)k_{t} - c_{t} - \color{red}{T_{t}}, & \\\ w_{t} = f(k_{t}) - f^{\prime}(k_{t})k_{t},& \\\ r_{t} = f^{\prime}(k_{t}). & \end{eqnarray}$$

Hence the dynamics for capital are now affected by public expenditures:

$$k_{t+1} = f(k_{t}) + (1-\delta)k_{t} - c_{t} - \color{red}{T_{t}}.$$

The inclusion of the term $T_{t}$ will impact the level of consumption —and only consumption— at the steady state. Indeed, we can compute it as we did before. From the Euler equation we have:

$$u^{\prime} (c_{t}) = \beta (f^{\prime}(k_{t+1}) + 1 - \delta)u^{\prime}(c_{t+1}).$$ The budget constraint above determines the dynamics of capital. Setting $c_{t} = c_{t+1} = \bar{c}^\mathcal{Gov}$ and $k_{t} = k_{t+1}= \bar{k}^{\mathcal{Gov}}$ reveals the steady-state levels of capital and consumption:

$$1 = \beta( f^{\prime}(\bar{k}^{\mathcal{Gov}}) + 1 - \delta) \implies f^{\prime}(\bar{k}^\mathcal{Gov}) = \frac{1-\beta(1-\delta)}{\beta},$$ $$\bar{c}^\mathcal{Gov} = f \left( \bar{k}^{\mathcal{Gov}} \right) - \delta \bar{k}^{\mathcal{Gov}} - \color{red}{G_{t}},$$ where we have used $G_{t} = T_{t}.$

Two main comments are important here:

• The $c$-locus is not affected, hence the steady-state level of capital remains the same,
• The $k$-locus moves closer to the horizontal axis, because we subtract $G_{t} > 0$ from it. This implies that the steady-state level of consumption is reduced.

Previous
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text:
# tf.contrib.ffmpeg.decode_video

tf.contrib.ffmpeg.decode_video(contents)

Create an op that decodes the contents of a video file.

#### Args:

• contents: The binary contents of the video file to decode. This is a scalar.

#### Returns:

A rank-4 Tensor that has [frames, height, width, 3] RGB as output.


text:
Sciencemadness Discussion Board » Fundamentals » Reagents and Apparatus Acquisition » Anyone ever built an overhead stirrer? Select A Forum Fundamentals   » Chemistry in General   » Organic Chemistry   » Reagents and Apparatus Acquisition   » Beginnings   » Responsible Practices   » Miscellaneous   » The Wiki Special topics   » Technochemistry   » Energetic Materials   » Biochemistry   » Radiochemistry   » Computational Models and Techniques   » Prepublication Non-chemistry   » Forum Matters   » Legal and Societal Issues   » Detritus   » Test Forum

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Author: Subject: Anyone ever built an overhead stirrer?
Hilski
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Anyone ever built an overhead stirrer?

I'm going to try and build an overhead stirrer similar to the one shown here:

http://designer-drugs.com/pte/12.162.180.114/dcd/chemistry/e...

I mostly want to use it for my manganese ammonium alum oxidation of toluene (and other stuff) experiment which really needs overhead stirring.

As you can see the difference is that my reaction is carried out in a large glass jar with an open top. I have to use a glass rod, because of the heated 60% H2SO4, so I will have to attach it to the stainless shaft of the original beater that came with the mixer. I have to find a way to stabilize everthing since I wont be using a rubber stopper with a glass tube, as is shown in the link I posted obove. I have a few ideas that will probably work, I just wanted to hear some ideas from some of the folks here before I decided anything.

Thanks

-Hilski
Magpie
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What you are saying I think is that you need to provide a bearing to prevent horizontal movement of your glass shaft.

It seems like a small block of Teflon, drilled slightly oversized for the shaft would do it. The block could be held in position with a ringstand and clamp or such.

The single most important condition for a successful synthesis is good mixing - Nicodem
not_important
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Teflon is overkill, if it's not going to get heated much then high density or UHMW polyethylene would work well for less than 1/6 the cost of teflon. And it should be easier to find, as well.

Use as long as of shaft as is practical, and put some vapour barriers between the motor and the solution. A sheet of thick polyethylene as a loose cover for the beaker, and another on the underside of the motor might do.

When working with corrosive solutions, it wasn't uncommon to place the motor some distance away and use a flexible shaft or belt-and-pulley rig to transmit power to the stirrer shaft. that's most likely more work than you want to do but might be worth thinking about for a few seconds.
evil_lurker
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Mood: On the wagon again.

http://www.eastwoodco.com/shopping/product/detailmain.jsp?it...

That right there with the drill mount would be the shiznit.

The shaft is only a measly $20. [Edited on 30-10-2006 by evil_lurker] Hilski Hazard to Others Posts: 197 Registered: 13-9-2006 Member Is Offline Mood: No Mood Yes. Basically I need to make a bearing for the stirrer shaft, to keep it from moving around too much. If I could come up with a good way to make a rigid connection between the steel shaft and the glass rod, a bearing probably would be uneccessary in this case. But since I will be using a flexible connection (Probably a piece of hose) I am going to need it. UHMW block (bearing) mounted onto a piece of Lexan (beaker cover) was what I was thinking, and was really the only viable thing I could even come up with. I especially like it since UHMW in all kinds of shapes and sizes is already freely available to me . The long flexible shaft idea is a good one. I may try a small diameter piece of fuel or hydraulic hose for this. It would still have to be relatively straight above the vessel, but the motor could be mounted pretty high above it I guess. If I could find some small diameter nickle rod locally, I would use that. Then I could just weld the nickle rod to the shaft on the mixer and be done with it. Come to think of it, there may be some 1/8" or 5/32" nickle welding rods around here somewhere if I can find them. Anyhow, once I get this contraption built, I'll post some pictures of it in this thread. Thanks for the replies. -Hilski bio2 National Hazard Posts: 447 Registered: 15-1-2005 Member Is Offline Mood: No Mood A motor from an old printer in a standard clamp on a ringstand is more versatile and smooth running. One of these easily stirs 12 liter of sludge/muck or whatever yet slows down to only about a hundred RPM Use the carriage motor with an LM317K (TO3 package) connected as constant current regulaor Hilski Hazard to Others Posts: 197 Registered: 13-9-2006 Member Is Offline Mood: No Mood  Quote: Originally posted by bio2 A motor from an old printer in a standard clamp on a ringstand is more versatile and smooth running. One of these easily stirs 12 liter of sludge/muck or whatever yet slows down to only about a hundred RPM Use the carriage motor with an LM317K (TO3 package) connected as constant current regulaor Thanks for that idea. I would have never thought of using a motor from a printer carriage. I'm definately going to look into this one, as I have a couple of old printers lying about. Is this something you have tried before? Thanks again. Hilski Hazard to Others Posts: 197 Registered: 13-9-2006 Member Is Offline Mood: No Mood I just took apart an old printer I had. These are the motors that were in it. Are they suitable for the setup you were talking about? Now I just need to figure out a good way to couple the glass stir rod to the motor. Thanks again for the idea. [Edited on 31-10-2006 by Hilski] Magpie lab constructor Posts: 5939 Registered: 1-11-2003 Location: USA Member Is Offline Mood: Chemistry: the subtle science. What about a "chuck" of some kind, like on a drill. Perhaps rubber lined. The single most important condition for a successful synthesis is good mixing - <NAME> Hazard to Others Posts: 197 Registered: 13-9-2006 Member Is Offline Mood: No Mood  Quote: Originally posted by Magpie What about a "chuck" of some kind, like on a drill. Perhaps rubber lined. That would be ideal. I was thinking of machining an aluminum coupling with a set screw to hold the rod, but the screw may crush the glass. [Edited on 31-10-2006 by Hilski] evil_lurker International Hazard Posts: 767 Registered: 12-3-2005 Location: United States of Elbonia Member Is Offline Mood: On the wagon again. Ya know, kantu200 ebay store has some good deals on overhead stirrer paddles. You should be able to get a rather large PTFE stirrer with stainless center for less than$40.
Magpie
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Your earlier idea has merits. E.g., fix a short metal stub shaft of the same diameter as your glass shaft to the motor shaft end. Then get a short piece of vacuum hose with ID such that it provides an interference fit to the glass shaft and the motor stub shaft. The PE (or even Nylon?) bearing(s) will assure glass shaft alignment to the stirred vessel.

This connection has the advantage of being cheap, easy, and will tolerate some misalignment of the glass and motor shafts.

There are other flexible couplings available on the market. But the above is likely the cheapest and best. The only disadvantage I can see is that it might have less tolerance to high torque than other types of couplings. But with glass you are going to be limited to low torque anyway.

The single most important condition for a successful synthesis is good mixing - Nicodem
Hilski
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Now I know why I never considered using printer motors. They're ALL bipolar stepper motors, and I don't feel like building a stepper motor controller. I don't know why in god's name I didn't notice that when I took them out of the printer.

I guess I'll just use the kitchen mixer for the time being until I get a more suitable (read: no programming or soldering ICB's because I'm lazy) motor. Unless of course, I can find one in the scrap pile of electronic junk that I've built in the past.
bio2
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....They're ALL bipolar stepper motors......

Not in the ones I took apart. There are 3 motors two are small steppers and the larger round one that moves the carriage belt is 18V PM type that will run down below 4v and still produce a lot of torque. It's the one with only two leads.

I have two of these from HP inkjet printers.. One is a magnetic stirrer and the other overhead with polypropylene coated steel shaft.

The overhead one draws about 1 amp at twelve volts and will easily throw the contents out of a vessel if run too fast.

[Edited on 1-11-2006 by bio2]
Hilski
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Sorry. Let me clarify that. I mean all the ones I have are stepper motors. I had 2 Epson printers, and all the motors out of both of those printers are stepper motors.
I'll look for an HP inkjet to tear apart at work. Maybe I'll get lucky.

Thanks.

-Hilski
YT2095
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you can buy cheap electric screwdrivers that will do the job quite nicely, I used one for a Ball Mill I made years ago, you only need the cheap plastic sorts that cost about 4 GBP.

\"In a world full of wonders mankind has managed to invent boredom\" - Death
Twinkies don\'t have a shelf life. They have a half-life! -Caine (a friend of mine)
gsd
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 Quote: Originally posted by Hilski I guess I'll just use the kitchen mixer for the time being until I get a more suitable

To the best of my observation, you can not run kitchen mixer motors on continuous basis. If You have to operate your O/H stirrer for very long durations, they are not suitable for the job.

gsd
<NAME>
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It is much easier to do this sort of thing on a much larger
scale . When you get to HVAC ball bearing PSC motors having a 1/2" shaft , then you can get a set screw mounted arbor which bears a 1/2"-20 thread and mount
on that a jacobs chuck having the same thread .....
chuck your stirring rod into the thing like a drill in a drill press , and vary the speed using an ordinary variac .

To get good low speed operation , you will have to
take out the wave washer which comes in the motor
and sets excessive preload force on the ball bearings ,
flatten it nearly flat with a hammer , and reinstall it .
A little machine oil on the bearing shields to thin the heavy grease packed in the bearings is also needed
to free up the rotation and reduce the parasitic friction
for stable low speed operation .

Using only a varaic , the speed control is pretty stable
up to the 75% or so of the synchronous speed of the motor where it is operating on its stall slope , and
there is an equilibrium possible between the voltage
input , and the load presented which causes the motor
to seek and hold a speed where work output balances
power input . I have confirmed this in many experiments developing a hefty drive for a magnetic stirrer . Precision made motors of 48Y ( 5 5/8" ) diameter
open construction and having end finned rotors and
higher grade ball bearings , not the cheap chinese bearings , work very well in this regard , motors of a
size in the range of 1/12 to 1/6 horsepower , and it
hurts nothing to take a motor rated at the higher output
and a higher voltage like 1/6 at 240 , and run it at half
that voltage as a variable speed stirrer drive .

The best motor I found for this so far is a Marathon X269
and operating it using a small variac across the 0-120 range , even though the motor is rated for 1/6 at 240 . It is very smooth .

[Edited on 2-11-2006 by <NAME>]
Hilski
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Just an update:

I ended up using (temporarily) a small shaded pole AC motor I had. I think it came out of an old ice cream maker. I'm using a plain old dimmer switch to control speed, and it actually works pretty well as long as there is at least some load on the motor. I made a small paddle out of a piece of HDPE, and bent the end of a glass rod into a sort of 'U' shape so that it would grip the paddle and not let it fall off. I'll post pictures of this thing as soon as I have some.

I also found a cordless drill motor that I didn't know I had. It's just the motor with no chuck, but I'm sure it could be more precisely controlled than the AC motor can.

In any case, the current setup will stir the hell out of the manganous alum mixture, which was really my goal in the first place. Easily made benzaldehyde is finally within reach.

**I almost forgot: Someone mentioned using an electric screwdriver for this application. That would definately be super easy to rig up. But, all the electric screwdrivers I have seen only turn about 200rpm. Isn't that much too slow to make an effective stirrer? I think I will buy one and try it out just for the hell of it, because I am curious as to how well it would work.

[Edited on 5-11-2006 by Hilski]
<NAME>
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but it is the most minimal and least efficient of all
the choices of motors which will work , and has to be

Probably the ultimate stirrer drive would be a DC servo motor equipped with an encoder and an active speed
control .....but grab your wallet if you can't scrounge
such a motor for cheap , as the motor alone will cost
hundreds of dollars .

Some of the EMC appliance motors could possible be adaptable , but even they are fairly expensive .

One of the surplus old disk drive , or reel tape drive
servo motors from the early days of the computer industry , could also be adaptable ...and some of these
have encoders or a bare encoder shaft as a stub where
you can perhaps mount a small encoder wheel . Some
of these motors should have good speed control just
operating open loop and controlling the voltage .

And a last possibility you might look at is those motors
which are used for the radiator fans in automotive applications . For a light to medium duty requirement
these may be the cheapest and easiest solution .

[Edited on 5-11-2006 by <NAME>]
Magpie
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stirrer chuck

I recently aquired a Wheaton overhead stirrer. I plan to use it in round bottom flasks, etc, when magnetic stirring is not adequate. It is used and did not come with a chuck for securing the mixer shaft. For purchase of a chuck I have narrowed my options to two:

1. A 1/4" Jacobs Multi-Craft chuck and an "arbor attachment for an electric motor." Cost: ~$17 2. An Ace Glass nylon flexible chuck for 6mm shafts. Cost: ~$26. See picture below.

The Jacobs chuck would be more clunky but could take shaft diameters from about 1/16" up to "1/4" (6.4mm), and provide a very positive grip.

The Ace chuck looks to be very light and simple, and have the advantage of being somewhat flexible. It is limited to shafts at or very near 6mm diameter.

Does anyone have any experience with the Ace type chuck? Please let me know your experiences and recommendations.

[Edited on 15-11-2008 by Magpie]

<NAME>
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It does what it is supposed to do but will spin a little unbalanced if something is not perfect when it is set up. If you pay Ace prices, you will be pissed when you get it because it cost less than a dollar to make.

Before this product and maybe still, real chemists used a tight-fitting piece of stiff rubber tubing between glass and metal shafts. A short piece of vinyl tubing wraps around the shaft here on the 8124.

An experience that you'll like is collecting the whole set. When the motor, chuck, a Trubore (neater than the bearings that are greased ground glass adapters), the rod and blade all come together as one piece inside your flask, it's a cool thing for the amateur. Don't know if you win if you end up with the most toys, but it's a good feeling having and using them.

EDIT: Well I can run the scanner using a sucky driver through Photoshop, just not as standalone app anymore thanks to Microsoft. So here is the instruction sheet - this shows the parts. The 10 mm version is 1 7/8" long and uses a 3/8" motor shaft. I'm not sure that Ace sells to individuals anymore BTW.

[Edited on 16-11-2008 by <NAME>]

Attachment: flexgrip.pdf (82kB)

Magpie
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Thanks S.C.

I have one further option in the works. I have asked VWR to quote me a price on a Wheaton chuck. But I'll be surprised if that doesn't come in north of \$100. It looks like a very small Jacobs chuck w/shaft adapter.

The use of a piece of vacuum tubing sounds like it would definitely have merits: good flexibility, lightness, slip at excessive torque, and almost zero cost. I may just give this a try before investing in anything else.
starman
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I've read over Roscoe's posts a few times and must admit most is going over my head.What are the general principles for a motor suited to "continuous operation."The little 12V dc motor I have in my mag stirrer/mantle seems to be about 10W (draws about 850mA @ 12V). I was thinking of purchasing something similar but higher wattage(around 35W or so) with a simple dimmer switch set up to build a light duty(not more than a litre flask) o/head stirrer.I'm thinking that this is probably similar to the radiator fan motor that Roscoe refers to.My worry here is possible sparks, overheating etc when used with volatile solvents.As a second question are the motors in a kitchen mixer any different than say a milkshake maker?At least with that you start out with a decent length shaft and mounting arrangements.I would have thought any of these AC appliance motors would burn out in farly short order?
kalacrow
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Electric Fan Motors.

These are available in all sizes, all types, rated for DC or AC and can be had at junk shops for next to nothing.

Or you can buy a small electric fan and convert it. They are very cheap.

They even come with a convenient stub for mounting a flexible shaft.

You probably wouldn't want to stir anything too viscous, but for regular reactions I can't imagine them not being able to do the job. With an AC one, you could just use a light dimmer to control the speed.

Other possibilities for more torque (these are all BIG):

- Any wood saw motor, especially one from a table saw
- dishwashing machines
- tabletop grinders
- wheel chair motors.

for smaller ideas...

- Electric R/C car motors (also, look around for "robot wars" motors. These guys are very good at finding cheap alternatives)
- automotive power window motors
- automotive windshield wiper motors

These small ones are usually permanent magnet DC motors and easy to control. They don't normally put out too much RPM, but they do have good torque, so you could rig a gearing or belt system that gave you more RPM. Also, with a DC motor like this, you'll need a speed controller of some kind.

Here's a link that might help:

http://coolrobots.com/builders/newbie.html

-
Pages:  1

 Sciencemadness Discussion Board » Fundamentals » Reagents and Apparatus Acquisition » Anyone ever built an overhead stirrer? Select A Forum Fundamentals   » Chemistry in General   » Organic Chemistry   » Reagents and Apparatus Acquisition   » Beginnings   » Responsible Practices   » Miscellaneous   » The Wiki Special topics   » Technochemistry   » Energetic Materials   » Biochemistry   » Radiochemistry   » Computational Models and Techniques   » Prepublication Non-chemistry   » Forum Matters   » Legal and Societal Issues   » Detritus   » Test Forum


text:
# Fabulous Prize if you win this contest! Enter here!

##### Well-Known Member
Here's the challenge:

Come up with the best possible sound system for a band with the lowest possible cost!

THE RULES:

This will be for a band with a 5 piece drum set, 2 electric guitars with crappy amps, a bass with a crappy amp, 1 lead vocalist without an instrument, and 2 backgroun vocalist on the guitars.
The system will have to mic the drums, however you choose to do that os up to you.
There mus be at least 2 stage monitors and 2 mains.
You get to decide what route to take. Be it mic the amps or run from line/headphone out int a board.

PLEASE INCLUDE PRICES AND A GRAND TOTAL, AS I CANNOT WASTE MY TIME ON SIMPLE ADDITION, I HAVE LESS DIFFICULT THINS I COULD BE DOING! Like watching TV. Or eating.

THE PRIZE:
The prize will be a super amazing brand new MYSTERY PRIZE. It could be anything! A new light board, a hawaiian vacation, or something else very wonderful! You will never find out unless you enter your entry today!

#### DMXtools

##### Active Member
It'd be nice to know what size venue it's to be used in. A small club might just call for a vocal PA, while a 1400-seat auditorium definitely calls for more power, subs, and miking everything. For anything too big for just a vocal PA, you'll want a sound guy with the board out in the audience... and he'll have his own ideas as to what the best sound system you can afford will look like.

John

##### Well-Known Member
Forget it, I'm too poor to afford a mixer, much less a hawaiian vacation!

#### TimoteusR

##### Member
Let me see.... You will need at least a budget of 100K$. Use 16,30$ of that money to buy (you could "borrow" *read steal* from one of your friends, but i don't endorse that) one of Spinal Taps DVD's. Watch the dvd witht the band. AND MAKE THEM TAKE NOTES!!

Now gather up all your equipment. Set them up with the drums in the middle. Amps on both sides of the drums (in front). Remember that they must point to your ankles. Now have you drummer play something. Tell the guitarist to turn up if they can't hear. Tell the singer to start singing. If others can't hear them they must sing louder. This will make the drummer play louder, then the guitarist will turn his amp up. Continue until your volume is appropriate. Tell them to stop. Now review your notes from the spinal tap video. You did take notes? See what happened to spinal tap? Use the system at your own risk.

#### tss_rocks

##### Member
One thing you may want to do is look into Behringer's equipment. It's extremely good value. I know here, in Canada, you can pick up one of their vocal mics (comparable to an SM58) for $39. Mixers (4 Channel/2 Aux) for less than$100.

Just my two cents...

#### dj_illusions

##### Active Member
Or even better... you could steer away from Behringer. I have one sitting to the left of me and there is nothing more Id like to do than get rid of the piece of crap!

Im not sure if you have these in the states, but my suggestion for FOH & monitors is to use RCF 300A or 400A Art Speakers. These are fantastic speakers, especially for the money. They are linkable, both in power and input aspects and have a 3 band parametric EQ on the unit. We have about 10 of them, and when I do outside concerts I will generally hire 4. 2 up front and 2 about mid way up the audience.

##### Well-Known Member
Yup, a Begringer miker helped me get it unger a grand. Even though I probably never end up buying it.

#### fosstech

##### Active Member
Behringer is a classic example of reverse-engineering. They take other companies' designs and make them cheaper, add 10x the noise, and flush the reliability down the toilet along with support. They have been sued by other sound companies for copying designs. Mackie was a classic example; they sued Behringer for having a console too similar to the Mackie 8-bus. Mackie won.

My word of advice, avoid Behringer. Most of their stuff isn't worth beans, and if it breaks (and it most likely will), you'll have a nice, hefty door stop.

#### Eboy87

##### Well-Known Member
The setup I'm using for the band that I run sound for (and keep in mind, this is a church band, so some isn't mine) is a Mackie DFX-12 mixer with an old Carvin studio-pro as a submix for vocal mics, that runs into a Behringer GEQ 3102 dual 31ch. EQ, through an Alesis 3630 Compressor/Limiter, and through a Carvin power-amp (not sure what model) to old JBL speakers. Moniters go through two Furman rack Rider RR-131's and a Carvin HT-150 amp, and to Carvin speakers. I use Digital refrence DRVX2 mics to mic an acustic guitarand an electric(through it's amp). For vocal mics I use 4 crown LM301A. The drums go throgh the same amp as the bass, whils I use the aux output on the amp to plug into the mixer.


text:
# Closure of an open set in the Zariski topology

For a commutative ring $R$ with 1, if $\mathrm{Spec} (R)$ is the set of all prime ideals of $R$, we can define the Zariski Topology on $\mathrm{Spec} (R)$ as follows:
1) The sets of the form $$V(E)=\{P \in \mathrm{Spec}(R)|E \subseteq P\}$$ are closed subsets.
2) The sets of the form $$D(E)=\{P \in \mathrm{Spec}(R) | E \not\subseteq P \},$$ are open subsets.
Is there any description for the closure of an open set $D(E)$ in the Zariski topology?

1) An arbitrary subset $Y\subset X=\operatorname {Spec}(R)$ has as closure $$\overline Y=V(\bigcap_{y\in Y}\mathfrak p_y)=\{\mathfrak p\in X\vert \mathfrak p\supset \bigcap_{y\in Y}\mathfrak p_y\}$$ For example if $R=\mathbb C[T]$ the closure in $X=\mathbb A^1_\mathbb C=\operatorname {Spec}(\mathbb C[T])$ of $Y=\{\mathfrak p _z=\langle T-z\rangle \vert z\in \mathbb Z\}$ is $\overline Y=X$, because $\bigcap_{z\in Y}\{\mathfrak p_z\vert z\in \mathbb Z\}=\langle 0\rangle$.
2) If by chance $X$ is irreducible, then every non-empty open subset $Y\subset X$ is dense so that $\overline Y=X.$ This applies to $D(E)$ as soon as $E\subsetneq \operatorname {Nil}(R)$ (i.e as soon as $E$ doesn't consist exclusively of nilpotent elements).
• Thanks you very mach your help <NAME>. But I want to know two facts \\a) What is the meaning of $\frak{p}_y$ b) Is there any verification for your claim? – K.Z Dec 18 '16 at 14:40
• Proof: Bosch page 206. The notation $\mathfrak p_y\subset R$ means the prime ideal corresponding to $y\in X$. – <NAME> Dec 18 '16 at 15:15


text:
home/teaching/timeseries

## In Construction

This course does not exist yet, but I already started uploading the course material, it’s all very rough.
Enjoy :)

### NaN, outliers, missing data

Graphs, NaN, Missing data, Outliers, resampling, filling missing data, smoothing (moving average, SavGol).
Data for this lecture: file1, file2.

### Seasonal decomposition

Split a periodic time series into three components: trend, seasonal (periodic) and residual (all the rest!)

### Convolution

Learn about running averages, how to smooth a curve, and what the heck a kernel is :)


text:
# Exercise 4.4.4

Use a reccursion tree to determine a good asymptotic upper bound on the recurrence $T(n) = 2T(n - 1) + 1$. Use the substitution method to verify your answer.

The depth is $n$, each level is $2^i$ and there are $2^n$ leaves. Thus:

$$T(n) = \sum_{i=0}^{n-1}2^i + \Theta(2^n) = \frac{2^n - 1}{2 - 1} + \Theta(2^n) = \Theta(2^n) + 2^n - 1 = \Theta(2^n)$$

We guess $T(n) \le c2^n + n$. Thus:

\begin{align} T(n) & \le 2c2^{n-1} + (n - 1) + 1 \\ & \le c2^n + n \\ & = O(2^n) \end{align}