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Manifold Microchannel Cooler for Direct Backs... 
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


Seth Lloyd's Quantum Computer 
Professor Seth Lloyd talks about the world's smallest universe, quantum mechanics, quantum computers, and pushing Moore's Law beyond the capacity of the human brain. A quantum computer is any device for computation that makes direct use of distinctively quantum mechanical phenomena, such as superposition and entanglement, to perform operations on data. In a classical (or conventional) computer, information is stored as bits; in a quantum computer, it is stored as qubits (quantum bits). The basic principle of quantum computation is that the quantum properties can be used to represent and structure data, and that quantum mechanisms can be devised and built to perform operations with this data. http://en.wikipedia.org/wiki/Quantum_computer
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Added By - matlabuser
Subject - Computer Science
Document Type - Profile
Video Duration - 00:03:59


Turbulent Boundary Layer (APS Gallery Submiss... 
High-quality movie of a turbulent boundary layer direct numerical simulation (DNS) and large-eddy simulation (LES) performed in 2010, reaching up to Re_theta=4300. Simulations were performed with up to 7.5 billion grid points on the Ekman cluster at KTH Stockholm. More information and simulation data: http://www.mech.kth.se/~pschlatt/DATA. Movie with better resolution: http://arxiv.org/abs/1010.4000\r\n\r\nResults of this DNS are described in Schlatter and Orlu, 2010, Journal of Fluid Mechanics, 659, 116-126.\r\n\r\nThe simulations use a spectral discretisation of the incompressible Navier-Stokes equations on a grid with up to 8192x513x768 spectral modes.\r\n\r\nSimulation code: Simson (http://www.mech.kth.se/~mattias/simson-user-guide-v4.0.pdf)\r\n\r\nhttp://www.mech.kth.se/mech/info_staff.jsp?ID=216
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Added By - A Ghosh
Subject - Aeronautics and Astronautics
Document Type - Assignment
Video Duration - moderate


J. Robert Oppenheimer[1] (April 22, 1904 – February 18, 1967) was an American theoretical physicist, best known for his role as the director of the Manhattan Project, the World War II effort to develop the first nuclear weapons, at the secret Los Alamos laboratory in New Mexico. Known as "the father of the atomic bomb," Oppenheimer was shocked by the weapon's killing power after it was used to destroy the Japanese cities of Hiroshima and Nagasaki. Quoting from the Bhagavad Gita, he said "If the radiance of a thousand suns were to burst at once into the sky, that would be like the splendor of the mighty one. Now I am become Death, the destroyer of worlds."

After the war, Oppenheimer was a chief advisor to the newly created United States Atomic Energy Commission and used that position to lobby for international control of atomic energy and to avert the nuclear arms race with the Soviet Union. After invoking the ire of many politicians and scientists with his outspoken political opinions during the Red Scare, he had his security clearance revoked in a much-publicized and politicized hearing in 1954. Though stripped of his direct political influence, Oppenheimer continued to lecture, write, and w...
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Added By - 123456
Subject - Physics
Document Type - Profile
Video Duration - 00:00:02


UCSD Computational MS Demo 

Video demo of the UCSD computational mass spectrometry tool.

I have copied the accompanying article from wikipedia. The link to the wikipedia page is given below.

The earliest devices that measured the mass-to-charge ratio of ions were called mass spectrographs because they were instruments that recorded a spectrum of mass values on a photographic plate.[2][3] Removing several letters, such as the bound morphemes and free morphemes, and combining the lingustical roots of spectr-um and phot-<...

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Added By - appliedmath
Subject - Softwares and Programming Languages
Document Type - Demonstration
Video Duration - 00:03:25


Air Traffic Pattern 
An airfield traffic pattern is a standard path followed by aircraft when taking off or landing.

At an airport, the pattern (or circuit in the Commonwealth of Nations) is a conventional standard path for coordinating air traffic. It differs from so-called "straight in approaches" and "direct climb outs" in that aircraft using a traffic pattern remain in close proximity to the airport. Patterns are usually employed at small general aviation (GA) airfields and military airbases. Most large airports avoid the system, unless there is GA activity as well as commercial flights. However, a pattern of sorts is used at airports in some cases, such as when an aircraft is required to go around.

Pilots prefer to take off and land facing into the wind. This has the effect of reducing aircraft speed over ground and hence reducing the distance required to perform either maneuver.

The exception to this rule is at Alpine airports, 'Altiports' where the runway is on a severe slope. In these instances, takeoffs are made downhill and landings uphill, with the slope aiding in acceleration and deceleration.

Many airfields have runways facing a variety of directions. The purpose of this is to pr...
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Added By - prashant bharadwaj
Subject - Aeronautics and Astronautics
Document Type - White Board
Video Duration - 00:03:14


Fuel Cells 
In essence, a fuel cell works by catalysis, separating the component electrons and protons of the reactant fuel, and forcing the electrons to travel through a circuit, hence converting them to electrical power. Another catalytic process takes the electrons back in, combining them with the protons and the oxidant to form waste products (typically simple compounds like water and carbon dioxide). In the archetypal hydrogen–oxygen proton exchange membrane fuel cell (PEMFC) design, a proton-conducting polymer membrane, (the electrolyte), separates the anode and cathode sides. This was called a "solid polymer electrolyte fuel cell" (SPEFC) in the early 1970s, before the proton exchange mechanism was well-understood. (Notice that "polymer electrolyte membrane" and "proton exchange membrane" result in the same acronym.) On the anode side, hydrogen diffuses to the anode catalyst where it later dissociates into protons and electrons. The protons are conducted through the membrane to the cathode, but the electrons are forced to travel in an external circuit (supplying power) because the membrane is electrically insulating. On the cathode catalyst, oxygen molecules react with the electrons (which have traveled through the external circu...
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Added By - sidpatel
Subject - Energy
Document Type - White Board
Video Duration - 00:07:02


New Diabetes Research 
A discussion of Type 1 diabetes and stem cell treatment.Diabetes mellitus (IPA: /ˌdaɪəˈbiːtiːz/ or /ˌdaɪəˈbiːtəs/, /məˈlaɪtəs/ or /ˈmɛlətəs/), often simply diabetes (Greek: διαβήτης), is a syndrome characterized by disordered metabolism and inappropriately high blood sugar (hyperglycaemia) resulting from either low levels of the hormone insulin or from abnormal resistance to insulin's effects coupled with inadequate levels of insulin secretion to compensate.[2] The characteristic symptoms are excessive urine production (polyuria), excessive thirst and increased fluid intake (polydipsia), and blurred vision. These symptoms are likely absent if the blood sugar is only mildly elevated. The World Health Organization recognizes three main forms of diabetes mellitus: type 1, type 2, and gestational diabetes (occurring during pregnancy),[3] which have different causes and population distributions. While, ultimately, all forms are due to the beta cells of the pancreas being unable to produce sufficient insulin to prevent hyperglycemia, the causes are different.[4] Type 1 diabetes is usually due to ...
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Added By - autocrawler
Subject - Medical Sciences
Document Type -
Video Duration - 00:10:39


CEV NASA space launch rocket trip to moon 
The Draft Statement of Work for the CEV was issued by NASA on December 9, 2004, and slightly more than one month later, on January 21, 2005, NASA issued a Draft Request For Proposal. The Final RFP was issued on March 1, 2005,[2] with the potential bidders being asked to answer by May 2, 2005.

NASA had planned to have a suborbital or an Earth orbit fly-off called Flight Application of Spacecraft Technologies (FAST) between two teams' CEV designs before September 1, 2008. However, in order to permit an earlier date for the start of CEV operations, Administrator Griffin had indicated that NASA would select one contractor for the CEV in 2006. From his perspective, this would both help eliminate the currently planned four-year gap between the retirement of the Shuttle in 2010 and the first manned flight of the CEV in 2014 (by allowing the CEV to fly earlier), and save over $1 billion for use in CEV development.[3]

On June 13, 2005, NASA announced the selection of two consortia, Lockheed Martin Corp. and the team of Northrop Grumman Corp. and The Boeing Co. for further CEV development work.[4] Each team had received a US$28 million contract to come up with a complete design for the CEV and its launch vehicle un...
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Added By - 123456
Subject - Aeronautics and Astronautics
Document Type - Documentary
Video Duration - 00:00:02

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