Birefringence in a film of polypropylene
The colours in the image are the result of birefringence and relate to the residual stress in the film, following the biaxial stretching process. The uniformity of the colour (with contrast only where an additional thickness of film exists or where wrinkling has resulted in a different apparent thickness) is indicative of both a uniform film thickness and of the uniformity of the drawing process used to make the film. Note that unlike polyethylene, the film has not been permanently strained in
Solving Logarithmic Equations - Problem 2 of 3
This video is a continuation and works through an example problem that demonstrates how to solve logarithmic equations with a single log on one or both sides. (2:22)
Solving Logarithmic Equations
Just as logarithms are used to access exponents in exponential equations, exponentiation can be used to access the insides of a logarithm. This video explains how solving logarithmic equations often involves exponentiation of logarithms in order to get rid of the log and access its insides. Sometimes the product, quotient, or power rules of logarithms are used when solving logarithmic equations. (1:20)
War of the Roses-Alternate History
This one minute video does not have narration. It is just a series of graphics that provide a little bit of humor to event.
2.160 Identification, Estimation, and Learning (MIT)
This course provides a broad theoretical basis for system identification, estimation, and learning. Students will study least squares estimation and its convergence properties, Kalman filters, noise dynamics and system representation, function approximation theory, neural nets, radial basis functions, wavelets, Volterra expansions, informative data sets, persistent excitation, asymptotic variance, central limit theorems, model structure selection, system order estimate, maximum likelihood, unbia
Catholic Mass - 12/18/2011 (Fourth Sunday of Advent)
Duke Catholic Center's Celebration of the Eucharist Fr. Michael Martin, OFM, presiding http://catholic.duke.edu Fourth Sunday of Advent Service begins @ 7:20 Homily begins @ 22:42 Scripture: First Reading: 2 Samuel 7:1-5,8b-12,14a,16 Responsorial Psalm: Psalm 89:2-3,4-5,27,29 Second Reading: Romans 16:25-27 Gospel: Luke 1:26-38 Hymns (from the the Gather hymnal, ©1994): Processional Hymn: O Come, O Come, Emmanuel (317) Offertory Hymn: Like a Shepherd (325) Communion Hymn:You Satisfy the Hu
How Humpbacks Hunt With Bubbles
Humpback whales blow bubbles around schools of fish to concentrate them for easier capture. It's called a bubble net, says David Wiley, research coordinator for Stellwagen Bank National Marine Sanctuary, and it's visible as a ring of bubbles at the surface. Now, with underwater digital tracking tags and custom visualization software, whale researchers can see what the whales are doing underwater when they're bubble-netting. (3:51)
Israeli bird radar technology promises clear skies for pilots
Dec. 28 - The Israeli airforce is using bird tracking radar technology to ensure safe aviation over Israeli skies, one of the busiest junctions of avian migration routes world-wide. In the past 25 years, 10 airforce planes have crashed in collisions with migrating birds, but the new system, developed at Tel Aviv University can now tell pilots where the birds will be in real time. Joanne Nicholson reports.
Tehran talks tough
Jan 4 - Iran threatens action if the U.S. Navy moves an aircraft carrier back into the Gulf. Paul Chapman reports.
Human Tube, A
Against a background of high-rises and rubble, the image of a young man running across an empty lot is repeated. A sense of urgency builds. Buildings explode and crumble to the ground. A hand-held camera surveys the moving ground. Images are blurred, erased, distorted, replaced, and repeated to create this dramatic short work by Paul Garrin. Dramatic electronic music was composed and performed by Ryuichi Sakamoto.The piece is approximately five minutes in length and was broadcast as a segment of
Lights, Camera, Action!
This lesson is designed to introduce students to the role immigration has played in building our country. Through literature and hands-on activities, students will explore the difficulties that have confronted newcomers to the United States. Students will also construct an interview with a character from a story, then videotape the presentation.
Earth Today 1998
The ability to see Earth from space has forever changed our view of the planet. We are now able to look at the Earth as a whole, and observe how its atmosphere, oceans, land masses, and life interact as global systems. Earths atmosphere, hydrosphere, geosphere, and biosphere are dynamic, changing on timescales of days, minutes, or even seconds. Monitoring the Earth in near real time allows us to get an up to date picture of conditions on our planet. More SVS visualizations for the Earth Today ex
Inside a Pred’s Coach’s Deep Brain Stimulation Surgery
When the Nashville Predators take the ice—it’s all about strength, precision and teamwork. But when a beloved former coach with the Preds started feeling the harsh symptoms of Parkinson’s Disease—he turned to a team here at Vanderbilt. Coach Brent Peterson allowed VUCast’s Carole Bartoo and Mike Todd inside the operating room to witness his deepkeep reading »
Luminary Awards Banquet Part 2
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Professor Sir Leszek Borysiewicz: Challenges of global health
Professor Sir Leszek Borysiewicz, Vice-Chancellor of the University of Cambridge, delivers a public lecture at Madingley Hall on 24 November 2011. The lecture is chaired by Dr Ron Zimmern, Chairman of the Foundation for Genomics and Population Health, and introduced by Dr Rebecca Lingwood, Director of Continuing Education at the University of Cambridge. Please note that the lecture proper begins at the 4:05 minute point in the video.
This video clip contains the meeting of two very diverse cultures, the Spanish and the Aztecs. Upon arrival the Spaniards were taken aback by the well developed city of the Aztecs. The Spaniards eventually realized the weaknesses of the Aztecs, for example, their lack of weapons, and eventually take control and conquer the Aztecs. (1:28)
Frozen stress photoelastic assessment of load distribution around a cylinder
The experiment indicates a more uniform of shear stress than that predicted by the shear lag model, suggesting that the model underestimates the magnitude of fibre loading, especially at low fibre aspect ratios. Eshelby type models, on the other hand, successfully predict the average phase stresses, but not the form of stress varying within the fibres.
Warren G. Harding's Presidency
In this video clip learn more about Warren G. Harding, the 29th president of the United States and find out why many Americans thought that he wasn't fit to be president. (1:51
Cómo empezó la Segunda Guerra Mundial - en español
Una de las causas de la Segunda Guerra Mundial fueron las ideologías
totalitarias, como el nazismo en Alemania, el fascismo en Italia o el
comunismo en Rusia. (4:30)
45 45 90 Triangles
A 45 45 90 triangle is a special type of isosceles right triangle where the two legs are congruent to one another and the non-right angles are both equal to 45 degrees. This video describes how to use the Pythagorean theorem to find the missing legs or hypotenuse of 45 45 90 triangles. (4:17)