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CompactPCI Enclosures

Elma Electronic, Inc. (Freemont, CA) has released the Type 39 2U EasyPlug CompactPCI enclosures. The Type 39c HA line features 9U cPCI backplanes that include pluggable 47-pin connectors for hot-swapping power supplies. There also are pluggable fan tray headers and optional shelf management modules.

Posted in: Products, Products, Electronics & Computers
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Fibre Channel PMC Card

Gbps channel Fibre Channel (FC) PMC card designed for high-bandwidth data communications and storage applications. The card supports both SCSI Fibre Channel Protocol (FCP) and Internet Protocol (IP), including both File System SCSI and Raw Initiator SCSI.

Posted in: Products, Products, Electronics & Computers
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System Host Boards Feature Multi-Core Processors

Trenton Technology (Atlanta, GA) offers the MCX/MCG system host boards with dual multi-core processors in numerous configurations for demanding computing applications. MCX-series boards are server-class boards that provide multiple PCI Express™ links to option card slots and devices on a PICMG® 1.3 backplane.

Posted in: Products, Products, Electronics & Computers
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Simulations of Stall and Stall Control in Turbocompressors

Anumerical-simulation study of stall and stall control in radial and axial compressor stages of gas turbine engines has been performed. This and other similar studies are needed because even though the adverse consequences of stall are well known and rudimentary stall-warning and stall-control systems are in use, the scientific basis for predicting and mitigating stall is not yet established.

Posted in: Briefs, Mechanical Components, Simulation and modeling, Compressors, Gas turbines
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Application of CFD to a Slender-Bodied, Finned Projectile

In an application of computational fluid dynamics (CFD), flow fields about a slender-bodied finned projectile and the resulting aerodynamic forces and moments on the projectile were computed. The size and shape of the projectile (a blunt-nosed, ogivecylinder body, 316.7 mm long, 23.5 mm in diameter, with four tail fins) are representative of a preliminary design of a future air-defense projectile. The computations are exemplary of those needed for predicting aerodynamic performances in order to optimize designs of advanced projectiles, missiles, and rockets in general.

Posted in: Briefs, Information Technology, Computational fluid dynamics, Missiles
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Multi-Scale Model of Failure in a Composite Material

An adaptive concurrent multilevel computational model of failure in a heterogeneous-material structure has been developed. As used here, "concurrent" is a term of art characterizing a class of structural/material models that (1) incorporate submodels representing material substructures at different spatial scales from macroscopic to microscopic, (2) the equations of the various models are solved simultaneously, and (3) the solutions at the various scales are coupled. The present model applies, more specifically, to a unidirectionalfiber/ matrix composite material structure. The model can be used to simulate and analyze the initiation and growth of damage, starting from microstructural damage in the form of debonding at fiber/matrix interfaces.

Posted in: Briefs, Information Technology, Failure analysis, Simulation and modeling, Composite materials
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Adaptive Quantum Design of Semiconductor Devices

The term "adaptive quantum design" denotes a methodology for systematically seeking robust, manufacturable designs of semiconductor devices — especially semiconductor optoelectronic devices having nanoscale or even atomic- scale features. This methodology has been developed to complement advances in fabrication capabilities that make it possible to tailor semiconductor devices ever more precisely, such that it likely will soon be possible to routinely control the positions of features as small as atoms and molecules within devices. Because the number of atom configurations that could, potentially, be fabricated is almost unimaginably large and quantum fluctuations and collective quantum phenomena become important at molecular and atomic scales, traditional design methods and traditional models of device physics based on classical physics and semiclassical approximations of quantum phenomena are not adequate for exploration of the vast space of design options.

Posted in: Briefs, Electronics & Computers, Design processes, Semiconductor devices
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Real-Time Simulation and Semiautomated Design of Complex ICs

A project called “System on a Chip Real-Time Emulation” (SOCRE) was undertaken to develop and demonstrate a methodology of simulation of operation and semiautomated design of complex mixed-signal (analog/digital) integrated circuits (ICs). The methodology includes the use of a simulation engine (consisting of computer hardware and software) for real-time emulation of a designed IC, in conjunction with an automated design flow that enables automated or semiautomated synthesis of a final design and automated or semiautomated fabrication of the ICs of the designed IC without need for manual reentry of a description of the design.

Posted in: Briefs, Electronics & Computers, CAD / CAM / CAE, Integrated circuits, Test procedures
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A Study of Two Ferrocene-Based Molecular Electronic Devices

Acomputational-simulation study of two ferrocene-based molecular electronic devices was performed as part of a continuing effort to develop a capability for ab initio design of metallocene-based electronic devices in general. In addition to the obvious technological advantage for realization of the potential of molecular electronic devices, such a capability would afford an economic advantage by enabling avoidance of the cost of synthesis of many organic molecules that subsequent testing would show to be unpromising for electronic-device applications.

Posted in: Briefs, Electronics & Computers, Simulation and modeling, Electronic equipment
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Continuous-Wave Atom Laser

Progress has been made toward realization of a continuous-wave, phase-andamplitude- stable atom laser based on magnetic guiding, magnetic compression, and continuous distributed evaporative cooling of a sparse cloud of 87Rb atoms. This apparatus is intended to serve as a prototype of sources of coherent matter waves for future atom-interferometric field and motion sensors.

Posted in: Briefs, Photonics, Lasers, Sensors and actuators
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