Simplifying Square Roots
In this video Sal Khan focuses on demonstrating how to simplify square roots. The video has small writing and should be opened to 'full screen' to view. (05:36)
ENS Lyon - Les métamorphoses de la légitimité (Pierre Rosanvallon)
Alors que la démocratie est considérée comme en panne, certains éléments de vitalité apparaissent. Notamment un décentrement des démocraties par rapport au champ électoral. Il faut alors analyser les différentes formes de légitimité en distinguant légitimité d’impartialité, de proximité et de réflexivité.
Swarms: First Class Citizens in the Future Internet (série : Colloquium Jacques Morgenstern)
The current Internet consists of tens of thousand different interconnected autonomous networks. It was designed to support large populations of point-to-point content transfers. This introduces considerable headaches due imbalances in traffic flows, which has the effect of complicating network management, reducing the robustness of the Internet, and reducing user performance.
In this talk, I review the sources of traffic in the Internet over the last 20 years. We will obser
Criticism of Internet publicity
You can follow the most important ideas regarding commercial actions in a radio program column.
See why Cathy chose to attend the University of Memphis.
See why Cathy chose to attend the University of Memphis.
Element of a short story
A song to learn about the different elements of a short story.
Elements of a Short Story
Learn more about how a good short story is made.
How Do Satellites Work?
This 5:57 uses narration and graphics to help show how communications satellites work. The video does an excellent job of showing how these impact cell phones and television and other media.
Robust source-seeking hybrid controllers for nonholonomic vehicles (experiment)
This video shows an experiment involving a mobile robot, an IR-camera vision system, and a wireless network. The robot queries the vision system for position information. The robot uses this position information to simulate a potential function in its environment. The hybrid controller uses these measurements in a coordination of vehicle steering and an optimization algorithm to drive the vehicle to the minimum of the function (shown as a blue 'x').
Stability of response characteristics of a Delphi panel: application of bootstrap data expansion
Background
Delphi surveys with panels of experts in a particular area of interest have been widely utilized in the fields of clinical medicine, nursing practice, medical education and health care services. Despite this wide applicability of the Delphi methodology, there is no clear identification of what constitutes a sufficient number of Delphi survey participants to ensure stability of results.
Methods
The study analyzed the response characteristics from the first round of a Delphi survey con
Learning to describe, classify, and differentiate similar animals
In nature, many animals look very similar. It is important to be able to describe animals and differentiate them from other animals. Consider several rodents.
Ferns, poison oak, and an unknown hairy plant on the forest floor
Poison oak and the unknown hairy plant are similar, not in appearance, but because they both have characteristics that deter predators. The three leaflets of poison oak distinguish the plant as poisonous. The hair on hairy plants, on the other hand, is unattractive to insects for food.
Do Materials Get Tired? Creep
This video explains that materials will deform slowly or “creep” under the right conditions, when constant force is applied. “Strain” is illustrated with rubber bands and we learn that engineers can calculate creep strain as a function of time.
Three Ways to Check a Fetus's Chromosomes
This figure from Human Genetics: Concepts and Applications by Ricki Lewis identifies techniques used to collect cells from fetuses for genetic testing.
Dab of DNA Helps Keep Counterfeiters at Bay
Find out in this USA Today article how DNA sequences can vouch for a souvenir's authenticity.
Seeing and Feeling Sound Vibrations
Students examine the existence of sound by listening to and seeing sound waves while conducting a set of simple activities as a class or in pairs at stations. Students describe sound in terms of its pitch, volume and frequency. They use this knowledge to discuss how engineers study sound waves to help people who cannot hear or talk.
Corn for Fuel?!
In this activity, students examine how to grow plants the most efficiently. They imagine that they are designing a biofuels production facility and need to know how to efficiently grow plants to use in this facility. As a means of solving this design problem, they plan a scientific experiment in which they investigate how a given variable (of their choice) affects plant growth. They then make predictions about the outcomes and record their observations after two weeks regarding the condition of
Forensics
Survey of simple tests used by CSI
Program 6: Radix-2, DIT, One Butterfly FFT
This is a Fortran code for a simple Decimation-in-Time, Radix-2, one butterfly Cooley-Tukey FFT preceeded by a bit-reversing scrambler.
