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Displaying 34301 - 34325 of 73697

10 kV, 5A 4H-SiC Power DMOSFET

May 1, 2006
Author(s)
Sei-Hyung Ryu, Sumi Krishnaswami, Hull Brett, James Richmond, Anant Agarwal, Allen R. Hefner Jr.
In this paper, we report 4H-SiC power DMOSFETs capable of blocking 10 kV. The devices were scaled up to 5 A, which is a factor of 25 increase in device area compared to the previously reported value. The devices utilized 100 υm thick n-type epilayers with

An Examination of New Paradigms for Spline Approximations

May 1, 2006
Author(s)
Christoph J. Witzgall, David E. Gilsinn, Marjorie A. McClain
Lavery splines are examined in the univariate and bivariate cases. In both instances relaxation based algorithms for approximate calculation of Lavery splines are proposed. Following previous work Gilsinn, et al. [7] addressing the bivariate case, a

An Improved Two-Phase Pressure Drop Correlation for 180 degrees Return Bends

May 1, 2006
Author(s)
Piotr A. Domanski, Christian Hermes
A new correlation for two-phase flow pressure drop in 180? return bends is proposed based on a total of 241 experimental data points for R-22 and R-410A. The data span smooth tubes with inner diameters (D) from 3.25 mm to 11.63 mm, bend radiuses (R) from 6

Anisotropic elastic properties of nanocrystalline nickel thin films

May 1, 2006
Author(s)
Donna C. Hurley, Roy H. Geiss, N Jennett, Malgorzata Kopycinska-Mueller, A Maxwell, Jens Mueller, David T. Read, J Wright
As length scales continue to shrink, new tools are needed to measure mechanical properties. We are developing two such tools using different nondestructive acoustical techniques. Surface acoustic wave spectroscopy (SAWS) uses laser-ultrasonic methods to

Automatically Testing Interacting Software Components

May 1, 2006
Author(s)
Leonard J. Gallagher, Jeff Offutt
One goal of integration testing for object-oriented software is to ensure high object interoperability. Sent messages should have the intended effects on the states and subsequent actions of the receiving objects. This is especially difficult when software

Chemical and Physical Characterization of Poly(p-phenylene benzobisoxazole) Fibers Used in Body Armor

May 1, 2006
Author(s)
Joannie W. Chin, E Byrd, Amanda L. Forster, Xiaohong Gu, Tinh Nguyen, Kirk D. Rice, Walter J. Rossiter Jr, S J. Scierka, John R. Sieber, Paul E. Stutzman, Li Piin Sung
Problems with the performance and durability of body armor based on poly(p-phenylene benzobisoxazole (PBO) fiber became apparent in the summer of 2003, when PBO-based body armor that was less than 8 months was penetrated by a bullet. Mechanical testing of

Control Based Mobile Ad-hoc Networks For Video Communications

May 1, 2006
Author(s)
Hamid Gharavi
This paper presents a feedback control scheme for transmission of video signals over mobile ad-hoc channels. The scheme is a combination of cross-layer (local) feedback and receiver feedback. The receiver feedback is based on the real time transport

Damping mechanisms for precision applications in UHV environment

May 1, 2006
Author(s)
Sumanth B. Chikkamaranahalli, R. R. Vallance, Bradley N. Damazo, Richard M. Silver
Surface analysis techniques such as scanning probe microscopy (SPM) have undergone significant advances and are attractive for application to electron and optical devices such as micro lenses, vacuum tubes, electron tubes, etc. For surface stability

Evaluating Reasoning Systems

May 1, 2006
Author(s)
Conrad Bock, Michael Gruninger, Donald E. Libes, Joshua Lubell, Eswaran Subrahmanian
A review of the literature on evaluating reasoning systems reveals that it is a very broad area with wide variation in depth and breadth of research on metrics and tests. Consolidation is hampered by nonstandard terminology, differing methodologies

Evaluation of Aerodynamic Drag and Torque for External Tanks in Low Earth Orbit

May 1, 2006
Author(s)
William C. Stone, Christoph J. Witzgall
A numerical procedure is described in which the aerodynamic drag and torque in low Earth orbit are calculated for a prototype Space Shuttle external tank and its components, the "LO2" and "LH2" tanks, carrying liquid oxygen and hydrogen, respectively, for

Exchange Coupling in Magnetic Multilayers

May 1, 2006
Author(s)
Mark D. Stiles
In magnetic multilayers, the magnetizations of two ferromagnetic layers separated by a non-magnetic spacer layer are coupled by the electrons in the spacer layer. This coupling oscillates in sign as a function of the thickness of the spacer layer

Excimer Laser Treatment of Carbon Nanotubes

May 1, 2006
Author(s)
Katie Hurst, Darryl A. Keenan, Anne Dillon, Thomas Gennett, Paul Rice, John H. Lehman
Raman spectroscopy and spectral responsivity measurements are performed to investigate the alteration of sample purity and morphology, caused by varying pulse parameters for laser treatment of bulk carbon nanotubes using a 248 nm excimer-laser.

Manufacturing Interoperability

May 1, 2006
Author(s)
Steven R. Ray, Albert T. Jones
National Institute of Standards and Technology, Gaithersburg, MD 20899, USA ABSTRACT: As manufacturing and commerce become ever more global in nature, companies are increasingly dependent upon the efficient and effective exchange of information with their

Mutationism and the dual causation of evolutionary change

May 1, 2006
Author(s)
Arlin B. Stoltzfus
The rediscovery of Mendel's laws a century ago launched the science that William Bateson called "genetics," and led to a new view of evolution combining selection, particulate inheritance, and the newly characterized phenomenon of "mutation." This
Displaying 34301 - 34325 of 73697
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