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Title          
Manifold Microchannel Cooler for Direct Backs... 
   
 
Abstract    
Manifold Microchannel Cooler for Direct Backside Liquid Cooling of SiC Power Devices, presented by Lauren Everhart at the Mechanical Engineering Summer Lecture series at the University of Maryland (July 2008). Power semiconductor devices are semiconductor devices used as switches or rectifiers in power electronic circuits (switch mode power supplies for example). They are also called power devices or when used in integrated circuits, called power ICs. Some common power devices are the power diode, thyristor, power MOSFET and IGBT (insulated gate bipolar transistor). A power diode or MOSFET, for example, operates on similar principles as its low-power counterpart, but is able to carry a larger amount of current and typically is able to support a larger reverse-bias voltage in the off-state. Structural changes are often made in power devices to accommodate the higher current density, higher power dissipation and/or higher reverse breakdown voltage. The vast majority of the discrete (i.e non integrated) power devices are built using a vertical structure, whereas small-signal devices employ a lateral structure. With the vertical structure, the current rating of the device is proportional to its area, and the volta...
 
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Added By - researchusa
Subject - Mechanical Engineering
Document Type - Seminars and Presentations
Video Duration - 00:31:19
 
 
 

 

Title          
Piano string harmonics and chords 
   
 
Abstract    
Demonstration of the physics of guitar string harmonics and chords. Many more video demonstrations of engineering and physics principles and devices can be found at: http://video_demos.colostate.edu
 
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Added By - matlabuser
Subject - Laboratory Equipment
Document Type - Experiments
Video Duration - 00:01:46
 
 
 

 

Title          
Guitar string harmonics and chords 
   
 
Abstract    
Demonstration of the physics of guitar string harmonics and chords. Many more video demonstrations of engineering and physics principles and devices can be found at: http://video_demos.colostate.edu
 
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Added By - matlabuser
Subject - Aeronautics and Astronautics
Document Type -
Video Duration - 00:02:33
 
 
 

 

Title          
4-stroke internal combustion engine demonstra... 
   
 
Abstract    
http://video_demos.colostate.edu Demonstration of the components and workings of a 4-stroke internal combustion engine. Many more video demonstrations of engineering and physics principles and devices can be found at: http://video_demos.colostate.edu
 
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Added By - matlabuser
Subject - Mechanical Engineering
Document Type - Demonstration
Video Duration - 00:02:03
 
 
 

 

Title          
Video Journey Into Nanotechnology 
   
 
Abstract    

Published for educational purposes only.Please visit http://nano.cancer.gov/ for further information.

Nanotechnology, shortened to "Nanotech", is the study of the control of matter on an atomic and molecular scale. Generally nanotechnology deals with structures of the size 100 nanometers or smaller, and involves developing materials or devices within that size. Nanotechnology is very diverse, ranging from novel extensions of conventional device physics, to completely new approaches based upon molecular self-assembly, to developing new materials with dimensions on the nanoscale, even to speculation on whether we can

 
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Added By - 123456
Subject - Nanoscience and Nanotechnology
Document Type - Documentary
Video Duration - 00:03:20
 
 
 

 

Title          
3D Printing from MIT 
   
 
Abstract    
In this video, we show how MIT research continues to push the boundaries of the burgeoning technology of 3-D printing. The following excerpt is from the MIT news office webpage at http://web.mit.edu/newsoffice/2011/3d-printing-0914.html "The initial motivation was to produce models for visualization — for architects and others — and help streamline the development of new products, such as medical devices. Cima explains, “The slow step in product development was prototyping. We wanted to be able to rapidly prototype surgical tools, and get them into surgeons’ hands to get feedback.” 3DP technology involves building up a shape gradually, one thin layer at a time. The device uses a “stage” — a metal platform mounted on a piston — that’s raised or lowered by a tiny increment at a time. A layer of powder is spread across this platform, and then a print head similar to those used in inkjet printers deposits a binder liquid onto the powder, binding it together. Then, the platform is lowered infinitesimally, another thin layer of powder is applied on top of the last, and the next layer of binder is deposited."
 
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Added By - A Ghosh
Subject - Mechanical Engineering
Document Type - Demonstration
Video Duration - moderate
 
 
 

 

Title          
Improving the safety of air transportation 
   
 
Abstract    

Dr. Kara Peters of NC State University's College of Engineering is researching how to improve the testing of composite materials used in aircrafts. This includes real time monitoring devices that could significantly improve aircraft safety as well as make aircraft maintenance more easy. While metallic frames are easy to inspect for damages, composites offer some challenges to being inspected for damages. Two of Kara Peter's papers are listed here for quick reference :

 

Efficient simulation of Bragg grating sensors for implementation to damage identification in composites

Method for determination of crack bridging parameters using long optical fiber Bragg grating sensors  

 
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Added By - A Ghosh
Subject - Aeronautics and Astronautics
Document Type - Discussion
Video Duration - moderate
 
 
 

 

Title          
Amazing Liquid 
   
 
Abstract    
A non-Newtonian fluid is a fluid in which the viscosity changes with the applied strain rate. As a result, non-Newtonian fluids may not have a well-defined viscosity.

Although the concept of viscosity is commonly used to characterize a material, it can be inadequate to describe the mechanical behavior of a substance, particularly non-Newtonian fluids. They are best studied through several other rheological properties which relate the relations between the stress and strain tensors under many different flow conditions, such as oscillatory shear, or extensional flow which are measured using different devices or rheometers. The rheological properties are better studied using tensor-valued constitutive equations, which are common in the field of continuum mechanics.

An inexpensive, non-toxic sample of a non-Newtonian fluid sometimes known as oobleck can be made very easily by adding corn starch (cornflour) to a cup of water. Add the starch in small portions and stir it in slowly. When the suspension nears the critical concentration - becoming like single cream (light cream) in consistency - the so called "shear thickening" property of this non-Newtonian fluid becomes apparent. The application of force - f...
 
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Added By - 123
Subject - Material Science and Engineering
Document Type - Demonstration
Video Duration - 00:00:02
 
 
 

 

Title          
Feynman :: Inconceivable nature of nature 
   
 
Abstract    

A second or third gen PAL VHS dub of a vintage original off-air NTSC VHS tape, then captured and compressed and found on a torrent site. squashed, re-compressed and converted for YouTube. all sorts of obvious video and audio problems, but at least it's here, a special treat from the past. anyone with better source, please drop a comment.

Richard Phillips Feynman (May 11, 1918 - February 15, 1988; IPA: /ˈfaɪnmən/) was an American physicist known for expanding the theory of quantum electrodynamics, the physics of the superfluidity of supercooled liquid helium, and particle theory. For his work on quantum electrodynamics, Feynman was a joint recipient of the Nobel Prize in Physics in 1965, together with Julian Schwinger and Sin-Itiro Tomonaga; he developed a widely-used pictorial representation scheme for the mathematical expressions governing the behavior of subatomic particles, which later became known as Feynman diagrams.

He assisted in the development of the atomic bomb and was a member of the panel that investigated the Space Shuttle Challenger disaster. In addition to his work in theoretical physics, Feynman has been credited with pioneering the fie...

 
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Added By - 123456
Subject - Physics
Document Type - Documentary
Video Duration - 00:00:02
 
 
 

 

Title          
high speed camera: lighter 
   
 
Abstract    

A high speed camera is a device used for recording slow-motion playback films, or used for scientific study of transient phenomena.

http://en.wikipedia.org/wiki/High_speed_camera 

A normal motion picture is filmed and played back at 24 frames per second, while television uses 25 frames/s (PAL) to 29.97 frames/s (NTSC). High speed cameras can film up to 250,000 frames/s by running the film over a rotating prism or mirror instead of using a shutter, thus reducing the need for moving parts. Using this ...

 
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Added By - matlabuser
Subject - Laboratory Equipment
Document Type - Patents and Inventions
Video Duration - 00:00:24
 
 
 

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