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Cold Mirrors

Deposition Sciences (Santa Rosa, CA) has released its Heat- Buster® cold mirror product line that features coating technology to withstand light levels above 200W per square centimeter and temperatures above 400°C. These cold mirrors feature reflectivity values of 98% across the visible spectrum and reflectivity in the infrared, with transmission of ≤20 percent in the 80-nm to 2500-nm waveband. The mirrors can be designed to operate over a variety of angles, and can be applied to infrared transparent substrates such as glass, fused silica, and sapphire, and opaque materials such as stainless steel and electroformed nickel.

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Halogen Light Sources

Moritex (San Jose, CA) offers a range of CE-compliant light sources comprised of 100W and 150W units that are CE-marked according to the Low-Voltage and EMC Directives. The halogen light sources employ an operating cycle to provide an output of ±1% at a color temperature of >3000K over a life span of 500 to 2,000 hours. The light sources may be manually controlled or remotely operated by analog or digital signals. Users are able to monitor rush currents, lamp abnormalities, and high lamp temperature. All the light sources offer universal input voltage of 100-240V, 50/60 Hz.

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Architecture Adaptive Computing Environment

Architecture Adaptive Computing Environment (aCe) is a software system that includes a language, compiler, and run-time library for parallel computing. aCe was developed to enable programmers to write programs, more easily than was previously possible, for a variety of parallel computing architectures. Heretofore, it has been perceived to be difficult to write parallel programs for parallel computers and more difficult to port the programs to different parallel computing architectures. In contrast, aCe is supportable on all high-performance computing architectures. Currently, it is supported on LINUX clusters. aCe uses parallel programming constructs that facilitate writing of parallel programs. Such constructs were used in single-instruction/multiple-data (SIMD) programming languages of the 1980s, including Parallel Pascal, Parallel Forth, C*, *LISP, and MasPar MPL. In aCe, these constructs are extended and implemented for both SIMD and multiple-instruction/multiple-data (MIMD) architectures. Two new constructs incorporated in aCe are those of (1) scalar and virtual variables and (2) pre-computed paths. The scalar-and-virtual-variables construct increases flexibility in optimizing memory utilization in various architectures. The pre-computed paths construct enables the compiler to pre-compute part of a communication operation once, rather than computing it every time the communication operation is performed.

Posted in: Medical, Briefs

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Stationary Apparatus Would Apply Forces of Walking to Feet

The forces would be tailored to prevent loss of bone density.A proposed apparatus would apply controlled cyclic forces to both feet for the purpose of preventing the loss of bone density in a human subject whose bones are not subjected daily to the mechanical loads of normal activity in normal Earth gravitation. The apparatus was conceived for use by astronauts on long missions in outer space; it could also be used by bedridden patients on Earth, including patients too weak to generate the necessary forces by their own efforts.

Posted in: Medical, Briefs

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Instrument Would Detect and Collect Biological Aerosols

Samples would be quickly collected on substrates that would be analyzed automatically.A proposed compact, portable instrument would sample micron-sized airborne particles, would discriminate between biological ones (e.g., bacteria) and nonbiological ones (e.g., dust particles), and would collect the detected biological particles for further analysis. The instrument is intended to satisfy a growing need for means of rapid, inexpensive collection of bioaerosols in a variety of indoor and outdoor settings. Purposes that could be served by such collection include detecting airborne pathogens inside buildings and their ventilation systems, measuring concentrations of airborne biological contaminants around municipal waste-processing facilities, monitoring airborne effluents from suspected biowarfare facilities, and warning of the presence of airborne biowarfare agents.

Posted in: Medical, Briefs

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Generating Control Commands From Gestures Sensed by EMG

Electrical signals from muscles involved in gestures are recognized.An effort is under way to develop noninvasive neuro-electric interfaces through which human operators could control systems as diverse as simple mechanical devices, computers, aircraft, and even spacecraft. The basic idea is to use electrodes on the surface of the skin to acquire electromyographic (EMG) signals associated with gestures, digitize and process the EMG signals to recognize the gestures, and generate digital commands to perform the actions signified by the gestures.

Posted in: Bio-Medical, Medical, Briefs

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Alternatives to Keyways in Motion Systems

The age-old tradition of using shaft keys in mechanical drives has served the power transmission industry well for many years. When appropriately sized, it guarantees that virtually no relative motion can take place between a shaft and its respective shaft hub in a unidirectional continuous motion application. Today’s increasing demands for speed, precision, and small size have changed the standard for shaft locking devices, and challenged motion components manufacturers to develop new methods of keyless shaft locking for dynamic loading. As motors and drives become increasingly capable of rapid acceleration and rotary positioning accuracy in smaller and smaller packages, backlash, stress distribution, and balance have all needed to be addressed in shaft locking devices, in many cases rendering the shaft key obsolete.

Posted in: Features, Motion Control, Articles

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