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London's Bridge Is Swaying
"London Bridge is falling down," repeats the well-known nursery rhyme. Indeed, that famous bridge over England's Thames River has been rebuilt several times over the centuries to correct engineering deficiencies and to support increased traffic. What's the newest bridge over the river, and why has it recently been declared unstable?
The Millennium Bridge across London's Thames River is the first new river crossing constructed since the Tower Bridge was opened in 1894. The new bridge is a pedestrian bridge, on which no vehicles are allowed. In order not to block the view of nearby St. Paul's Cathedral, this suspension bridge was given a unique design.
The suspension cables fan out sideways from the concrete and steel piers, instead of upward as is common with suspension bridges like the Golden Gate Bridge in San Francisco, California.
The bridge opened in June 2000. It was closed just days later due to severe swaying. The combination of wind and heavy foot traffic made the bridge sway side-to-side by as much as 20 cm (almost 8 inches), sending pedestrians grabbing for the handrails.
Although there is no danger of the bridge collapsing, it remains closed. Engineers are currently preparing a report that will help determine the future of the Millennium Bridge.
Students can read about the closing of the bridge at ABCnews.com's
"London Closes New $30 Million Bridge Because It Sways." This article includes a video news report that shows the bridge swaying. (Requires RealPlayer.
Download now.)
Students can get
general information about the bridge, including engineering drawings and preliminary findings from the engineering investigations into the extreme swaying of the bridge.
Teaching the Problem
Bridges have a "natural frequency." When the wind blows or people cross the bridge at a rhythm that matches this frequency, the force can cause the bridge to vibrate. This phenomenon is called resonance, and the frequency is called resonant frequency. Soldiers are taught to march across a bridge out-of-step, so they won't create vibrations that tap into the bridge's resonant frequency. In extreme cases, the vibrations can cause a bridge to collapse, as happened when the driving force of the wind caused the collapse of the Tacoma Narrows Bridge in Washington State in 1940.
Students can learn more about resonant frequency using the following sequence of Physics Explorer activities:
Students without any background in harmonic motion should start with
Harmonic Motion in One Dimension.
Position & Velocity vs. Time increases their understanding of harmonic motion.
Energy and Modeling examines the effects of damping and driving forces.
Students are introduced to the concept of resonance and natural frequency in
Forced Harmonic Motion.
Resonance explores resonant frequencies of a guitar string.
Finally, students explore the factors at work in the collapse of the Tacoma Narrows Bridge in the activity,
Periodic Driving Forces & Damping.
Analyzing the Problem
When an oscillating system is driven at one of its resonant frequencies, energy is transferred into the system, causing increased amplitude of the vibrations. An object will not resonate if its system dissipates (releases) energy faster than energy is added.
Have students define "damping" and "frictional force."
Ask them to use these concepts to suggest engineering solutions to stop the swaying of the Millennium Bridge.
can read about various cases in which resonant frequency
is an important factor:
Game and Beyond: Stinging and Broken Bats: A
look at how resonant frequency causes bats to "sting"
a batter's hands and how it can snap the bat altogether.
a Glass with Sound: A college student's demonstration
of how to use resonant frequency to break a glass.
(Requires QuickTime.)
Students can increase their understanding of resonant frequency at the following sites:
Exploratorium's Resonator: A hands-on experiment using wooden dowels to build a resonator and experience resonant frequency. Instructions are provided.
School Science's The Science of Audio Systems: Speaker Systems: Part of a larger educational unit in which students combine actual demonstrations with online information and questions.
Engineering bridges is no simple project. Students can explore some of the special problems facing civil engineers at the following sites:
NOVA Online's Super Bridge: An interactive multimedia site (companion to a television broadcast) presenting four major types of bridges and giving students the chance to match bridge types to typical locations. The site includes a teacher's guide.
How Bridges Work: An educational look at beam bridges, arch bridges, and suspension bridges.
Newton's Apple: Bridges: A lesson plan for having students design and build a model bridge.
Bridge Research: Leading the Way to the Future: A government report about the state of the nation's bridges, and the role and value of research as part of the nation's investment in highway bridges.


text: Don't Sit in the Front Row Series 1 - Episode 4 Share: About this programme 4/8. Phill Jupitus, Katherine Ryan and Tom Deacon take turns lampooning the lives of four members of the audience, with the one supplying the most material for the professionals walking away victorious. Jack Dee hosts. Cast and crew Cast Host Jack Dee Panellist Phill Jupitus Panellist Katherine Ryan Panellist Tom Deacon Categories Comedy Share:

subset: commoncrawl


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Leave some room for mystery in your life. Never want a God you can fully explain. read more
Charisma Magazine
All Stories in Men
Page 44 of 75
Can You Pass the Ultimate 'Man Test'?
It's not what you do on a field, on a court or at the office. Read on to discover God's biggest challenge for you as a man and a leader. read more
12 Clear Warnings About Dealing With Fools
Reckless men display certain characteristics. Read on to see if any are stunting your spiritual growth. read more
Promise Keepers 'Is Back'—Let's Rally Men to Attend This Year
Men in America are in deep emotional and spiritual trouble. In 2013, Promise Keepers vows to help buck that trend. read more
Get Creative With Memorable Family Photos
Don't just take ordinary family photos. Find out how you can make memories that will last a lifetime. read more
God Bombards His Change Agents With Character Tests
If you are called to be a world-changer, read Os Hillman's article and find out what God has in store for you to prepare you for the mission. read more
Are You Keeping Secrets That Damage Your Sex Life?
Every day you encounter our sexuality—physically, emotionally or spiritually. It's the secrets you keep that could be damaging your sex life. read more
Relentlessness Plays Key Role in Teen Parenting
There isn't a quintessential formula for raising godly, well-adjusted teenagers. Tenacity in pursuit of their well-being, however, is a good start. read more
Don't Shut Yourself Out of Servitude
Many of God's warriors may have initially felt inadequate to be used mightily of God, but they didn't let that stop them. read more
Movie Addresses Internal Pain for Fathers
Home Run, which releases in theaters this week, gets to the heart of relationships between fathers and sons. read more
10 Things Your Husband Hates
If you want a great marriage, don't do these 10 things to your husband.
How Should We Respond to Vicky Beeching?
Believers throughout the English-speaking world were shocked and saddened to hear that Vicky ...
Chuck Pierce: We Are in a Time of Major Warfare
The prophetic voice is sounding the alarm and warning saints to be alert and watchful.
It's Time to Get on God's Calendar
Messianic leader Don Finto says we've been robbed of a significant part of our godly heritage. ...
How to Raise Self-Righteous, Selfish Christian Kids
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Mark Driscoll, Spiritual Abuse and Cultish Ministries
It takes courage to confront spiritual abuse—and help to escape it.
So What Do We Do Now With Mark Driscoll?
The pastor of Mars Hill Church in Seattle has been accused of spiritual abuse. How do we respond?
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9 Reasons to Say No to Soy
Soy products have become all the rage in culture, but this information may throw up a red flag for ...
Ulf Ekman Faces His Accusers After Catholic Conversion
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3 Passive Actions That Are Killing Marriages
Are you caught in a vicious cycle of miscommunication with your spouse? These obstacles might be ...
When 'Til Death Do You Part' Becomes a Touching Reality
As Joyce Strader goes on to glory, it's moving to see her husband, Karl, and their children ...
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If you're facing an obstacle that looks impossible, read this. Here are proven strategies from ...
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Are your knuckles red from pounding on heaven's door? Are you discouraged because no matter how ...
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HPCL Recruitment 2014 (Managerial Posts)
Hindustan Copper Limited Managerial Posts Recruitment 2014 'HCL-Hindustan Copper Limited' has announces recently a great Job Opportunities regarding Fresh Job Vacancies Recruitment notification. It is accepting Indian citizens to fulfill the 'Various Posts' in Managerial Posts Jobs. This Hot notification is visible in their official...Continue reading »


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Michael Miller Cotton Couture Solids
February 16, 2012 at 8:38 pm 4 comments
It's a good day for quilters. A new line of solids feels somewhat like when you were a kid and you got a big box of new crayons. You know, the one with the sharpener in the back. You opened up the box and saw all the possibilities along with the rainbow of color. That's how I felt today opening up the cutest color card imaginable.
I needed a yard of a deep blue or indigo for a quilt binding and was expecting to choose a lovely Kona cotton. But lo and behold the Cotton Couture solids had arrived at Hart's and I had to check them out. My girl Dana pulled down a few colors I wanted to look at. What struck me at first was the tone of the color range. By comparison with other solids, the colors are softer, as though they are the solid versions of shot cottons. Rich, but not dark or heavy. I think these solids will play nicely with the harder to co-ordinate prints. I'm thinking of Japanese fabrics, which seem to have a palette all their own and fabric designers who use more jewel-like colors. I especially liked the neutrals, including several wonderful greys and taupes and off-whites which are so important to modern quilters. I noticed distinct colors that I feel are missing in other solid lines. HOORAY!
What cannot be underscored enough is the feel and drape of these fabrics. Made with long staple cotton, these solids are soft and luxurious feeling. I wouldn't think twice about making a pillowcase or clothing with them. Of course, they will do very nicely in quilts. They feel lighter in weight than Kona cotton, which I quite like.
Though more expensive than Kona cottons, in my estimation, I'll be using these solids a lot in the future. Well done Michael Miller!
Entry filed under: quilting. Tags: cotton couture, fabric, michael miller, quilting, quilts sewing, solids.
4 Comments Add your own
I love them SO much!!! I didn't realize you could buy the cards from Hart's. I will have to go pick one up. Maybe tomorrow when I go check out the Parson's Grey they got in!
Thanks, Tina! Great info. I'll be checking it out soon as I'm looking for a particular color that was not in Kona. And I agree with Anne. It would be amazing to have a color card:)
I'm only in the beginning stages of collecting solids so this is good news!
This line looks wonderful. The colors are a treat to the eye.
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[Joe] Torre's older brother played with the Braves. One of the turning points in his life came in 1955, when [Joe] visited the Braves' clubhouse and met one of his idols, Warren Spahn. 'Boy, are you fat,' said Spahn tactfully. He was fat, but he had been kind of hoping people wouldn't notice. The scouts had been noticing. Torre began to work on his weight, and emerged as a prospect.--Bill James, The New Bill James Historical Baseball Abstract, 375. James ranks Joe Torre as the 11th greatest catcher of all-time, and the best player in the majors in 1971. [What this is]
Look at the top ten-twenty players listed at each position. Which is the most likable group of guys? The third basemen, I think. Four of them are famous for being nice people (Robinson, Mathews, Molitor, Hack), as were Pie Traynor and Buddy Bell, and the others are all OK, not a real asshole among them. Well, Graig Nettles could be a jerk sometimes.... The left fielders are the worst of the bunch; in the top thirty you've got Ted Williams, Rickey Henderson, Joe Jackson, Goose Goslin, Jim Rice, Jesse Burkett, Joe Medwick, Ralph Kiner, and Albert Belle. Boy, there's a family re-union you can leave me out of...--Bill James, The New Bill James Historical Baseball Abstract, 542-543. [What this is]
Richie Ashburn combined the Pete Rose virtues and the Pete Rose style of play with the virtues of dignity, intelligence, and style. Like Rose, he was a three-hundred-hitting singles hitter who ran out every ground ball of his career, a player who got out of his body every pound of ability that the Lord had put in there. Unlike Rose, Ashburn did not extend his career beyond its natural boundaries to break any records. At the time he retired, he had only 188 hits fewer than Rose had at the same age, and had more than many of the 3,000-hit men had at the same age. He didn't need records to tell him who he was. Ashburn was a reader, a family man, a man of restraint and taste. My favorite Richie Ashburn story... One time Ashburn hit a line drive into the stands, striking a young woman in the side of the face and knocking her unconscious. The stadium gasped, Ashburn stepped out of the box and watched in alarm as medics rushed to her side. In a few minutes the woman revived, the stretcher came, and the ballgame resumed. And Ashburn hit another line drive foul, and struck the poor woman again as she was bring garried out of the stadium. Ashburn visited the woman in the hospital after the game, invited her to come down and meet the players, befriended her and her family, and corresponded with the woman for the rest of his life."--Bill James, The New Bill James Historical Baseball Abstract, 735. James ranks Richie Ashburn as the 16th greatest center fielder of all time. [Why I'm doing this "series.".]
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text: The Perseids: watch out for August's natural fireworks Science 08 August 13 by Paul Sutherland, Sen.com Tweet ScienceCasts: Perseid FireballsScienceAtNASA Amateur astronomers in the northern hemisphere are taking advantage of the warm summer nights to watch the build-up of the year's best known meteor shower, the Perseids.Though this shower of "shooting stars" does not peak until 12 August, activity is already underway. And it is a great year to observe the Perseids because moonlight will not interfere to drown them out.As with all meteor showers, the meteors are produced when the Earth ploughs through a stream of dust left by a comet orbiting the Sun and they flare in our atmosphere.They are called Perseids because, if you trace their streaks backwards, they appear to radiate from a point in the constellation of Perseus. This is an effect of perspective, like straight rail tracks converging to a distant point, and in fact the meteors are travelling on parallel paths.The comet responsible for the Perseids was Swift-Tuttle. The dust particles in space, called meteoroids, and about the size of grains of sand, are now spread right along the swarm's orbit. This means we see Perseids every August. They are a reliable shower, always rich in activity, although the numbers vary according to how dense the orbiting stream is at the point where we intersect.The stream is broad too, with the first Perseids appearing in our skies in late July and the final stragglers falling well into the second half of August. They are an excellent project for amateur stargazers and in fact it is the work of amateurs over many decades that has helped professional scientists learn more about such streams' orbits.Though professional techniques have helped them to compile pretty accurate maps of the orbiting dust, amateur observations are still considered very useful -- as well as being fun to do.The sight of a bright meteor is an awe-inspiring one and the Perseids are rich in such natural fireballs, according to Dr Bill Cooke, head of Nasa's Meteoroid Environment Office. This is because the head, or nucleus, of Comet Swift-Tuttle is particularly large for a comet, at around 26 km. A number of astronomical societies around the world encourage and collate observations of meteors by amateurs. A dedicated group, made up of a mix of serious amateurs and professionals, is the International Meteor Organization. In the UK, the Society for Popular Astronomy has a Meteor Section which is aimed particularly at helping beginners of all ages while also collecting useful results to help meteor research. Its director is Tony Markham.Sen asked Tony how a newbie might go about watching for Perseids. He told us: "Find as dark an observing site as possible with an unobstructed view of the sky and watch an area of sky that is around 30 degrees away from the constellation of Perseus and about 50 degrees above the horizon and wait."If you are lucky you will see a meteor within the first few minutes but you may have to wait longer, especially if your eyes are still adjusting to the dark. "The best Perseid rates will be seen during the nights of Aug 11-12 (Sun-Mon) and Aug 12-13 (Mon-Tue), but good rates will also be seen during Aug 10-11 and Aug 13-14. More patience is required if you observe on earlier nights, but several Perseids may still be seen each hour and if you are lucky a bright fireball might appear."So how many meteors might one expect to see? Tony said: "Although peak rates of 80 to 100 meteors per hour are often quoted for the Perseids, these would only be seen in perfect observing conditions with no haze and no sky glare from streetlighting."From a reasonably dark observing site you can expect, on the night of Perseid maximum, to see about a dozen Perseids per hour early in the night, rising to more than double this late in the night."While you sit watching, in your comfortable garden chair, you might well see other meteors that don't belong to the Perseid shower. Tony said: "The paths of Perseid meteors when traced backwards show them to have originated from the constellation of Perseus. There are however a number of minor meteor showers that are also active."These produce meteors that originate from Aquarius and Capricornus and collectively provide a few meteors per hour. In addition half a dozen or so meteors per hour can be seen appearing at random which we term sporadics." This article originally appeared on Sen.com Comments Read more on Space Everything to do with space technology, exploration travel and cosmological research and discovery Space RIP Russian space sex geckos (2014-2014) Technology Pyramid and human 'beehives' designed for Mars dwellers Science 'Let's fire penetration probes at Mars' says startup Technology This satellite offers military-grade imagery to the masses Science Get Hello Kitty to deliver a message from space Science How to walk on a comet without falling off Latest on wired.co.uk


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Ever wish that more things worked like college brackets? That you could seed everything that way? Top 64 pre-game foods. Top 64 college players. Well, now you can do just that with your friends, with the Allstate BFF Brackets, which takes your 64 top Facebook friends (an algorithm seeds them based on interaction) and seeds them in four regions, exactly like the real tourney. Once the tourney starts, your friends advance with the corresponding seeds – till one is left standing. Check it out at http://apps.facebook.com/bffbrackets
The 2011 NCAA tournament field is set and now it is time to take a look at the bracket indepth and take a look how the three Mountain West teams will fare, also I will take a look and see what double-digit seed has a chance to make a run in the tournament.
The San Diego St. Aztecs drew a No. 2 seed out West and in my opinion are the best team in that bracket due to their record of 32-2 and that the West regional third- and four-round games will be played just two hours north in Anaheim, Calif. The top seed in that region is the Duke Blue Devils, but their seed is a bit inflated due to their lack of wins over NCAA tournament teams. The other challenger which might be more difficult is the third-seeded Connecticut Huskies. Usually I don't put travel into consideration, but with San Diego State's top two challengers will be traveling across the country while San Diego State will have a quick trip up the coast and will have a home crowd advantage. Also, consider that Duke and to a lesser extent Connecticut are not fan favorite teams and will not have a big rooting section.
First off, San Diego State takes on the Northern Colorado Bears who won the Big Sky Conference regular season and postseason tournament to secure their bid. The two teams play on Thursday at 4:20 p.m. ET in Tucson, Ariz., and the game will be on TNT Kevin Harlan, Reggie Miller and Dan Bonner. There is no reason the Aztecs should lose this game.
The potential second round game will be against the winner of No. 7 Temple and No. 10 Penn State. This is the same Penn State team that scored only 33 points in a three-point loss to Wisconsin the Big 10 tournament. While Temple's best wins were against Georgetown early in the season and they beat Atlantic-10 champ Richmond Spiders once. Again, the Aztecs should have no problem making it to the Sweet 16, but one cautionary note is that San Diego State has never won a NCAA tournament game ever.
The rest of the West region that should make it to Anaheim should be Duke, UConn, San Diego State and either Texas or Arizona. With Texas' recent slide I will go with Arizona making it to Sweet 16. Those matchups would be No. 3 UConn vs. No. 2 San Diego State and then No. 5 Arizona vs. No. 1 Duke. Outside of San Diego State that bracket has a lot of great tournament history involved, but the Aztecs have experience in their coach Steve Fisher who took Michigan to a national championship and Final Four run with the Fab Five.
UConn has Kemba Walker which will be tough for any Aztec player to guard, but San Diego State has the size to compete with teams from better league and San Diego State will get past UConn and most likely take on Duke in the regional final. Biased aside for liking the Mountain West I think San Diego State can get past Duke. The Aztecs will be in front of both a pro-Aztec crowd and an anti-Duke crowd. That is if Duke can get to the Elite Eight by beating Arizona. San Diego State to the Final Four is not a reach like Butler was last year or the 2006 George Mason team.
The BYU Cougars are the other Mountain West team that can make a deep NCAA tournament run since they have the best scorer in the NCAA tournament with Jimmer Fredette. The Cougars are a third seed and take on a a tough Wofford Terriers on Friday night at 7:15 p.m. ET on CBS. Wofford is a team who has the eighth-best field-goal percentage team and are an above average scoring team that scores 74 points per game, but their downside, which is BYU's gain since they are without Brandon Davies, is that Wofford is 289th in the nation in rebounds per game. BYU should be able to get by Wofford with ease, and with the game in Denver, Colo., the Cougars will have the edge in fans.
BYU will get past Wofford, but their next matchup will be the winner of No. 6 seeded St. John's or No. 11 Gonzaga. Playing Gonzaga would be a good storyline since the two schools will be in WCC next year. Gonzaga has underachieved this year, but they are hot and half won nine-straight with two wins over St. Mary's college in that stretch. This game seems like a toss-up, but again I will give BYU the edge with Jimmer Fredette leading BYU to their first Sweet 16 appearance since the 1981 NCAA tournament.
If BYU makes it to the Sweet 16 they will most likely take on the two-seeded Florida Gators -- who are ranked 15th in the nation and were given a very generous seed -- who BYU beat last year in the first round of the NCAA tournament. Florida has had some very questionable losses by losing to Jacksonville, South Carolina and Mississippi State. BYU can get past Florida and can make it to the Elite Eight as long as their scorers outside of Fredette show up.
Now, if BYU gets this far their matchup in the Elite Eight will most likely be top-seeded Pitt or No. 5 seeded Kansas State. Pitt always seems to come up short over the past few years, but this time might be different and I don't think BYU could beat either team. The best chance is against Kansas State since they are a streaky team. My estimation on BYU is that they will either make it to the Elite Eight or lose to Gonzaga in round two.
UNLV has an unlike seed as they are the eighth seed and will take on a senior-laden Illinois team. UNLV has been playing better over the past month of the season outside of losing to Colorado State the Rebels have beaten who they are suppose to beat. Getting Illinois will be a homecoming of sorts since Kruger coached at Illinois for in the late nineties. UNLV getting past the second round would take a lot since they would be playing Kansas and unless the Rebels pull out some magic from the 2006-07 team then they are heading home
My upset pick for a lower seeded team that can make a tournament run to at least the Sweet 16 round is 12 seeded Utah State. The Aggies are seeded too low and probably deserved maybe a seven to 10 seed and their matchup to Kansas State is conducive to an upset as they were up-and-down all year and if Utah State can get past Kansas State they would get to play either Wisconsin or Belmont and move onto the Sweet 16. Beyond Utah State I don't see that many double-digit seeds making it past the first weekend. Actually, I could see Belmont get to the Sweet 16 if they get to play Utah State in round two, or Gonzaga if they can use their size advantage of BYU, assuming both of those underdogs get past the first round.
As for my Final Four picks I will go with San Diego State out West, Ohio State out East, Notre Dame from the Southwest bracket and Kansas State from the Southeast bracket. The Southeast bracket is the toughest to projected because Pitt has underachieved in tournament play the past few years, Florida is overrated in their seed, BYU is in a tough spot without Brandon Davies, so I could see any of those teams making the Final Four from that region.
My title game I think will be Notre Dame over Ohio State.
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text: Cassidy Turley Acquires Synergy Commercial Advisors Synergy is one of the leading tenant representation and corporate services firms in the region. Eight brokers from the firm are joining Cassidy Turley, including Mr. Harris, Doug Cook, Jim Flink, Mac Hammer, Robert Hoyt, Jerry Levit, Ryan Toland and Ben Litke. Synergy will relocate to Cassidy Turley's current office. Read More >>