MEMs

Adhesive/Sealant

NuSil Technology (Carpenteria, CA) offers FS3-3730 fluorosilicone adhesive/sealant, a one-part, fast-curing, room-temperature vulcanizing silicone that bonds to most surfaces. It is designed to seal and bond without the need for a primer. It resists degradation when exposed to jet fuel, solvents, gasoline, or crude oil, making it suitable for use in applications that involve a range of operating temperatures.

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Posted in: Products
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The Future of Space Propulsion

Significant challenges and advances in space propulsion have occurred over the past ten years. The end of the Cold War had significant impacts, both positive and negative. Operational systems now have to operate well beyond their design life. Parts and technology obsolescence are having a significant impact, as are an aging workforce and limited opportunities to develop new systems. The advent of asymmetric warfare is fully upon us. The military has to pro - ject power anywhere on the globe. In addition, there is concern that U.S. space assets are vulnerable in this new world. Furthermore, changes in acquisition policy driven by incredible cost and schedule overruns on nearly every space acquisition program will have significant impacts on the future of propulsion.
Posted in: Articles, Aerospace, Cost analysis, Technical reference, Rocket engines, Satellites, Spacecraft
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On-Board Vehicle Power for Mobile Forces

Current threats on our military forces have created a tremendous requirement for mobility as it relates to mission specifications. The objectives of onboard vehicle power (OBVP) are to develop, demonstrate, and transition electronic technologies that enable lighter, physically smaller, more efficient, and more reliable electronics, which are easier to operate and maintain. This in turn will enable current and emerging electronic systems to increase performance, have improved physical characteristics, be more reliable, and require significantly fewer lifecycle resources. Further development of these programs will also maximize the advantages of increased DC supply voltage inherent in military vehicles such as the High-Mobility Multi - purpose Wheeled Vehicle (HMMWV) for delivery of a power solution for multiple military platforms in excess of today’s available 10KW.

Posted in: Articles, Aerospace, Electronic equipment, On-board energy sources, Performance upgrades, Military vehicles and equipment
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Time-Coding of Asynchronous Data Transmissions

A method for providing a time code for multiple streams of simultaneously received data has been developed in order to allow reconstruction of the data after asynchronous transfer. It is often desirable to transmit data collected from a plurality of sensors. When the data is received, it is desirable that the original signal be reconstructed to have the same timing as the originally received data.

Posted in: Briefs, Physical Sciences, Data exchange, Data management, Identification
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Thermal Technology System Acquires Heat Data to Count People

The Flowslide, developed by Royal Boon Edam Group Holding BV, is a combination of a revolving door and curved sliding panels, installed at Charles de Gaulle Airport, Paris. The Flowslide offers a complete physical separation between two crossing passenger flows on a single floor, allowing arriving and departing passengers to use a single door. The entry and exit points open and close alternatively within the curved wall of the revolving door, while keeping the passengers separate. As the two sets of passengers never come into contact with each other — despite using the same doorway — the Flowslide has enabled today's higher levels of security to be met, without the need to redevelop the terminal.

Posted in: Briefs, Physical Sciences
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Digital-Image Data Acquisition System for Turbulent Mixing and Combustion

An equipment and instrumentation system for high-speed digital image data acquisition and processing includes components for Planar Laser Induced Fluorescence (PLIF), flame-speed, and ignition and extinction measurements of laminar flames at variable pressure; tracking flow structures in a high-speed mixing layer using high-speed color schlieren; laser-beam manipulation and volume scanning for three-dimensional turbulence measurements; and an expanded infrastructure capability for processing experimental and numerical-simulation data.

Posted in: Briefs, Physical Sciences
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Tool for Processing and Displaying Genomics Data in Spreadsheets

ChromaBlast is a computer program that facilitates and accelerates processing and display of data by use of Microsoft Excel or other spreadsheet software that affords similar capabilities. The development of ChromaBlast was prompted by a need for improved means of analyzing and reviewing massive data sets produced in genomics and microarray-based gene-expression experiments. ChromaBlast is also generally applicable to other data sets that are amenable to spreadsheet representation.

Posted in: Briefs, Software
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Magnetic Memory Devices for Embedded Computing

A program of research has been dedicated to the development of magnetic memory devices than can be incorporated into complementary metal oxide/semiconductor (CMOS) integrated circuits, wherein these devices can be made to function as radiation- hard logic elements and as components of small random-access memories. The goal of this development was not to provide for large-scale, bulk memories, but, instead, to provide for latches and flip-flops that can serve as state and data registers for sequential logic and as configuration registers for configurable logic. A major benefit afforded by these devices is the ability to retain the logical state of a subsystem that contains the devices when turning off the power to that subsystem to save energy until operation of the subsystem is required. The subsystem can then be powered up and begin operating within a time of the order of milliseconds.

Posted in: Briefs, Electronics & Computers
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Hybrid Micro-Electro-Mechanically Tunable Optical Filter

A prototype hybrid micro-electro- mechanically tunable optical filter (MEM-TF) based partly on an electrostatic-actuation principle has been built and tested as an essential component needed for the further development of a prototype micro-electro- mechanically tunable vertical- cavity surface emitting laser (MT-VCSEL). In turn, MT-VCSELs are needed as essential controllable-wavelength sources in diverse advanced optoelectronic devices and systems including, for example, wavelength-division multiplexers in fiber-optic communication systems; lightweight, compact, portable spectroscopic instruments for detecting chemical and biological warfare agents; holographic memory devices; fiber-optic sensors; optoelectronic signal-processing systems; and remote-sensing systems. The development of the prototype MEM-TF also has additional significance in that it demonstrates the merit of the hybrid approach (in comparison with the monolithic-integration approach) to design and fabrication of some advanced optoelectronic devices.

Posted in: Briefs, Photonics
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Silicon Nanowires for Anodes of Rechargeable Li Power Cells

Silicon nanowires have been investigated as alternatives to the graphite heretofore widely used as an anode material in rechargeable lithium-ion power cells. The theoretical specific charge capacity of graphite, corresponding to the maximum Li content (at a composition of LiC6) is 372 mA•hr/g. In contrast, the theoretical specific charge capacity of Si corresponding to the maximum Li content (at a composition of Li4.4Si) is much greater — 4.2 A•hr/g. In previous studies in which thin films of silicon on substrates were investigated for use as high-capacity anodes, it was found that charge capacities faded rapidly in charge/discharge cycling because large changes in volume (as much as 310 percent) associated with insertion and extraction of lithium ions caused cracking and crumbling of the films, as well as delamination of the films from the substrates. The basic idea of the present nanowire approach is to disperse the active anode material into regions having small volumes in order to reduce the sizes of the changes in volume in order to reduce the adverse effects of those changes.

Posted in: Briefs, Materials
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