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Nuclear Power Plant RPV Removal 
Barnhart develops creative plan to lift and remove RPV from Maine Yankee Nuclear Power Plant during decommissioning.
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Added By - scienceforum
Subject - Nuclear Engineering
Document Type - Documentary
Video Duration - 00:08:47


Solar Hybrid Power Plant 

Solar Hybrid Power Plant seminar by Hadley from Mechanical Enginnering at University of Maryland, College park

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Added By - sidpatel
Subject - Energy
Document Type - Seminars and Presentations
Video Duration - 00:31:10


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


Hydrogen Fuel Cell 
A fuel cell is an electrochemical device that combines hydrogen and oxygen to produce electricity, with water and heat as its by-product. As long as fuel is supplied, the fuel cell will continue to generate power. Since the conversion of the fuel to energy takes place via an electrochemical process, not combustion, the process is clean, quiet and highly efficient – two to three times more efficient than fuel burning. All the major automotive manufacturers have a fuel cell vehicle either in development or in testing right now, and several have begun leasing and testing in larger quantities. Automakers and experts speculate that the fuel cell vehicle will not be commercialized until at least 2010. Over the last four years, more than 50 fuel cell buses have been demonstrated in North and South America, Europe, Asia and Australia. Fuel cells are highly efficient, so even if the hydrogen is produced from fossil fuels, fuel cell buses can reduce transit agencies’ CO2 emissions. And emissions are truly zero if the hydrogen is produced from renewable electricity, which greatly improves local air quality. Because the fuel cell system is so much quieter than a diesel engine, fuel cell buses significantly reduce noise pollution a...
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Added By - sidpatel
Subject - Energy
Document Type - Documentary
Video Duration - 00:03:42


Wind Shear 
Strong outflow from thunderstorms causes rapid changes in the three-dimensional wind velocity just above ground level. Initially, this outflow causes a headwind that increases airspeed, which normally causes a pilot to reduce engine power if they are unaware of the wind shear. As the aircraft passes into the region of the downdraft, the localized headwind diminishes, reducing the aircraft's airspeed and increasing its sink rate. Then, when the aircraft passes through the other side of the downdraft, the headwind becomes a tailwind, reducing airspeed further, leaving the aircraft in a low-power, low-speed descent. This can lead to an accident if the aircraft is too low to effect a recovery before ground contact.[15] As the result of the accidents in the 1970s and 1980s, in 1988 the U.S. Federal Aviation Administration mandated that all commercial aircraft have on-board windshear detection systems by 1993. Between 1964 and 1985, wind shear directly caused or contributed to 26 major civil transport aircraft accidents in the U.S. that led to 620 deaths and 200 injuries. Since 1995, the number of major civil aircraft accidents caused by wind shear has dropped to approximately one every ten years, due to the mandated on-board detection ...
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Added By - prashant bharadwaj
Subject - Aeronautics and Astronautics
Document Type - White Board
Video Duration - 00:02:00


High voltage disconnect switch 

An electrical substation is a subsidiary station of an electricity generation, transmission and distribution system where voltage is transformed from high to low or the reverse using transformers. Electric power may flow through several substations between generating plant and consumer, and may be changed in voltage in several steps.

A substation that has a step-up transformer increases the voltage while decreasing the current, while a step-down  

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Added By - justin
Subject - Electrical Engineering
Document Type - Demonstration
Video Duration - 00:00:09


Leonardo Da Vinci Automovile (1495) 
Fantastic virtual and material reconstruction of the first thing can be called car or looks like a car and works the same. The automobile that Leonardo attempted to power with a modified clockwork mechanism is one of his best-known inventions. It was not, however, an invention in the strict sense of the word, for other engineers before him had also made attempts to produce a self-powered vehicle. It is probable that Leonardo was familiar with these studies, though it is remarkable how intense Leonardo's research of this technical phenomenon was.
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Added By - pierce
Subject - Mechanical Engineering
Document Type -
Video Duration - 00:01:26


4-stroke internal combustion engine demonstra... 
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


Competitive Market Efficiency 

Perfect competition is an economic model that describes a hypothetical market form in which no producer or consumer has the market power to influence prices. According to the standard economical definition of efficiency (Pareto efficiency), perfect competition would lead to a completely efficient outcome. The analysis of perfectly competitive markets provides the foundation of the theory of supply and demand.

To be exhaustive, note that some economists[1] do not agree with this presentation of the model of perfect competition. Many reasons are advanced, but one of the main is that it focuses on unnecessary conditions (atomicity, perfect information...) while it does not allow an answer to the question : "If agents are price-takers, who sets the prices ?" Indeed, in this model, as firms and consumers can not set the prices, it can't be—as it is often said (e.g. below)—that it is the firms who fix them. So, actually, there is a need for a benevolent agent who proposes prices to firms and consumers and fixes the ones at which exchange will occur. They also think that the argument that a global entity called "the market" could fix the prices, when its constituents (producer...

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Added By - 123456
Subject - Business and Management
Document Type - Discussion
Video Duration - 00:08:43


Fish Inspired Wind Turbines 
Excerpt from http://www.caltech.edu/article/13430 "The power output of wind farms can be increased by an order of magnitude—at least tenfold—simply by optimizing the placement of turbines on a given plot of land, say researchers at the California Institute of Technology (Caltech) who have been conducting a unique field study at an experimental two-acre wind farm in northern Los Angeles County. A paper describing the findings—the results of field tests conducted by John Dabiri, Caltech professor of aeronautics and bioengineering, and colleagues during the summer of 2010—appears in the July issue of the Journal of Renewable and Sustainable Energy."
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Added By - A Ghosh
Subject - Bioengineering
Document Type - Documentary
Video Duration - moderate

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