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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          
Deployment of ANDE Satellites by STS-116 
   
 
Abstract    
The Atmospheric Neutral Density Experiment (ANDE) Risk Reduction Mission consists of two spherical spacecraft fitted with retro-reflectors for satellite laser ranging (SLR). Scientific objectives of the ANDE missions include monitoring total neutral density along the orbit for improved orbit determination of space objects, monitoring the spin rate and orientation of the spacecraft to better understand in-orbit dynamics, and to provide a test object for polarimetry studies. The mission will provide objects in low Earth orbit with well-determined ballistic coefficients and radar cross-sections for comprehensive atmospheric modeling. Each mission will include a passive and an active spherical spacecraft in a lead-trail orbit configuration. The passive sphere will be tracked with the Space Surveillance Network (SSN) and SLR to study atmospheric drag and in-track total density. The active sphere will have on-board instrumentation to measure atmospheric density and composition. The active sphere will monitor its position relative to the passive sphere to study drag models. The active satellites will communicate on-board data through a system of modulated retro-reflectors (MRR). Mission Objectives: Provide Total Atmospheric Density for O...
 
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Added By - autocrawler
Subject - Aeronautics and Astronautics
Document Type - Computer Simulations
Video Duration - 00:06:05
 
 
 

 

Title          
Lamina Flow Stirling Engine 
   
 
Abstract    

This amazingly simple engine runs at 700rpm heated only by a small candle.

Thermoacoustic hot air engines (Sonic heat pump and refrigeration or thermoacoustic heat pump and refrigeration) of which nearly all are thermoacoustic stirling engines is a technology that uses high-amplitude sound waves in a pressurized gas to pump heat from one place to another - or uses a heat temperature difference to induce sound, which can be converted to electricity with high efficiency, with a (piezoelectric) loudspeaker.

This type of heat pump or refrigerator has no

 
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Added By - quantum
Subject - Energy
Document Type - Demonstration
Video Duration - 00:01:00
 
 
 

 

Title          
Finite Difference 
   
 
Abstract    
A finite difference is a mathematical expression of the form f(x + b) − f(x + a). If a finite difference is divided by b − a, one gets a difference quotient. The approximation of derivatives by finite differences plays a central role in finite difference methods for the numerical solution of differential equations, especially boundary value problems. In mathematical analysis, operators involving finite differences are studied. A difference operator is an operator which maps a function f to a function whose values are the corresponding finite differences. An important application of finite differences is in numerical analysis, especially in numerical ordinary differential equations and numerical partial differential equations, which aim at the numerical solution of ordinary and partial differential equations respectively. The idea is to replace the derivatives appearing in the differential equation by finite differences that approximate them. The resulting methods are called finite difference methods. Common applications of the finite difference method are in computational science and engineering disciplines, such as thermal engineering, fluid mechanics, etc.
 
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Added By - Ipshita Chakraborty
Subject - Aeronautics and Astronautics
Document Type - White Board
Video Duration - 00:11:05
 
 
 

 

Title          
Solid Oxide Fuel Cells 
   
 
Abstract    

A solid oxide fuel cell (SOFC) is an electrochemical conversion device that produces electricity directly from fuel. Fuel cells are characterized by their electrolyte material and, as the name implies, the SOFC has a solid oxide, or ceramic, electrolyte. Ceramic fuel cells operate at much higher temperatures than polymer based ones.

Solid oxide fuel cells are intended mainly for stationary applications with an output from 100 W to 2 MW. They work at very high temperatures, typically between 700 and 1,000°C. Their off-gases can be used to fire a secondary gas turbine to improve electrical efficiency. This enables efficiency to reach as much as 90% in these hybrid systems, called combined heat and power (CHP) device. In these cells,  

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Added By - sidpatel
Subject - Energy
Document Type - White Board
Video Duration - 00:09:12
 
 
 

 

Title          
Damped and Driven Oscillations - Resonance 
   
 
Abstract    

Oscillation is the repetitive variation, typically in time, of some measure about a central value (often a point of equilibrium) or between two or more different states. Familiar examples include a swinging pendulum and AC power. The term vibration is sometimes used more narrowly to mean a mechanical oscillation but sometimes is used to be synonymous with "oscillation." Oscillations occur not only in physical systems but also in biological systems and in human society.

The simplest mechanical oscillating system is a mass attached to a linear

 
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Added By - reberg
Subject - Physics
Document Type - Demonstration
Video Duration - 00:08:41
 
 
 

 

Title          
Influence of a Streamwise Pressure Gradient o... 
   
 
Abstract    

In this video, Kiran Dellimore gives a broad overview of his research paper entitled  'Influence of a Streamwise Pressure Gradient on Film-Cooling Effectiveness' published in the JOURNAL OF THERMOPHYSICS AND HEAT TRANSFER,Vol. 23, No. 1, January-March 2009. His co-authors are Carlos Cruz, Andre W. Marshall, and Christopher P. Cadou all from the University of Maryland, College Park, Maryland 20742.

The paper may be accessed using the following DOI: 10.2514/1.35717

Film cooling is widely used in conventional gas turbine and rocket engines to minimize thermal loading of engine structures and to manage heat transfer between hot, reacting gases and cooler structural components. Previous experimental work has shown that streamwise pressure gradients strongly influence the performance of the film.This paper extends semi-empirical modeling ideas for wall-jet film cooling to include the effects of adverse and favorable pressure gradients. The extended model shows that a pressure gradient’s effect on cooling performance depends on whether the velocity of the film is greater than the core flow (a wall-jet...

 
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Added By - kdellimo
Subject - Aeronautics and Astronautics
Document Type - Journal Paper Discussion
Video Duration - 00:05:20
 
 
 

 

Title          
Model of a stirling engine in motion 
   
 
Abstract    

Model of stirling engine realized by a syringe and a test-tube.

In the family of heat engines, 'Stirling engine' defines a closed-cycle regenerative hot air engine (or other permanent gas) engine, though the term is often used incorrectly to refer generically to a much wider range of hot air engine types. In this context, "closed-cycle" means that the working fluid is permanently contained within the system, whereas "open-cycle" engines such as internal combustion engine and some steam engines, exchange working fluid with their surroundings as part of the

 
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Added By - quantum
Subject - Mechanical Engineering
Document Type - Demonstration
Video Duration - 00:00:58
 
 
 

 

Title          
Marble displacer Stirling Engine 
   
 
Abstract    

5 rolling marbles act as the displacer in this engine. The rigid connection between the piston and conrod is what tips the test tube, rolling the marbles.

Model of stirling engine realized by a syringe and a test-tube.

In the family of heat engines, 'Stirling engine' defines a closed-cycle regenerative hot air engine (or other permanent gas) engine, though the term is often used incorrectly to refer generically to a much wider range of hot air engine types. In this context, "closed-cycle" means that the working fluid is permanently contained within the system, whereas "open-cycle" engines such as internal combustion engine and some st...

 
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Added By - quantum
Subject - Mechanical Engineering
Document Type - Demonstration
Video Duration - 00:00:08
 
 
 

 

Title          
The Phoenix Mars Lander 
   
 
Abstract    
A new space explorer is waiting in the wings and ready to take center stage: the Mars lander called Phoenix. Phoenix's assignment is to dig through the Martian soil and ice in the arctic region and use its onboard scientific instruments to analyze the samples it retrieves. Mars is a cold desert planet with no liquid water on its surface. But in the Martian arctic, water ice lurks just below ground level. Discoveries made by the Mars Odyssey Orbiter in 2002 show large amounts of subsurface water ice in the northern arctic plain. The Phoenix lander targets this circumpolar region using a robotic arm to dig through the protective top soil layer to the water ice below and ultimately, to bring both soil and water ice to the lander platform for sophisticated scientific analysis. The complement of the Phoenix spacecraft and its scientific instruments are ideally suited to uncover clues to the geologic history and biological potential of the Martian arctic. Phoenix will be the first mission to return data from either polar region providing an important contribution to the overall Mars science strategy "Follow the Water" and will be instrumental in achieving the four science goals of NASA's long-term Mars Exploration Program. - Dete...
 
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Added By - matlabuser
Subject - Aeronautics and Astronautics
Document Type -
Video Duration - 00:06:50
 
 
 

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