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Technologies are needed for the economical production of polymers that are based on today's generally accepted standards for "green" chemistry. Of particular interest are chemistries that produce safe chemicals, and/or that use safer solvents and auxiliaries, and/or that produce chemicals designed for degradation. Click here to respond to this Tech Need.

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Raised Relief Mars Globe Brings the Red Planet Closer

When the Mars Reconnaissance Orbiter (MRO) entered the Red Planet's atmosphere in March 2006, it joined the ranks of other noble explorers studying the planet over the past 2,000-plus years. This new NASA orbiter will study the Martian atmosphere and surface, and probe underground in search of past and present water, making it one of the most advanced studies of the planet to date. People have been aware of the existence of Mars and in awe of its presence for centuries, ever since early humans noticed that it did not shimmer like the surrounding stars.

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X-Ray Vision



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Four-Quadrant Analog Multipliers Using G4-FETs

Devices with independently biased multiple inputs are exploited to simplify multiplier circuits. Theoretical analysis and some experiments have shown that the silicon-on-insulator (SOI) 4-gate transistors known as G4-FETs can be used as building blocks of four-quadrant analog voltage multiplier circuits. Whereas a typical prior analog voltage multiplier contains between six and 10 transistors, it is possible to construct a superior voltage multiplier using only four G4-FETs.

Posted in: Briefs, TSP

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SSRL Emergency Response Shore Tool

The SSRL Emergency Response Shore Tool (wherein “SSRL” signifies “Smart Systems Research Laboratory”) is a computer program within a system of communication and mobile-computing software and hardware being developed to increase the situational awareness of first responders at building collapses. This program is intended for use mainly in planning and constructing shores to stabilize partially collapsed structures. The program consists of client and server components, runs in the Windows operating system on commercial off-the-shelf portable computers, and can utilize such additional hardware as digital cameras and Global Positioning System devices.

Posted in: Briefs, TSP

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Automated Synthesis of Architectures of Avionic Systems

The Architecture Synthesis Tool (AST) is software that automatically synthesizes software and hardware architectures of avionic systems. The AST is expected to be most helpful during initial formulation of an avionic-system design, when system requirements change frequently and manual modification of architecture is time-consuming and susceptible to error. The AST comprises two parts: (1) an architecture generator, which utilizes a genetic algorithm to create a multitude of architectures; and (2) a functionality evaluator, which analyzes the architectures for viability, rejecting most of the non-viable ones. The functionality evaluator generates and uses a viability tree — a hierarchy representing functions and components that perform the functions such that the system as a whole performs system-level functions representing the requirements for the system as specified by a user. Architectures that survive the functionality evaluator are further evaluated by the selection process of the genetic algorithm. Architectures found to be most promising to satisfy the user’s requirements and to perform optimally are selected as parents to the next generation of architectures. The foregoing process is iterated as many times as the user desires. The final output is one or a few viable architectures that satisfy the user’s requirements.

Posted in: Briefs, TSP

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Partial Automation of Requirements Tracing

Requirements Tracing on Target (RETRO) is software for after-the-fact tracing of textual requirements to support independent verification and validation of software. RETRO applies one of three user-selectable information-retrieval techniques: (1) term frequency/inverse document frequency (TF/IDF) vector retrieval, (2) TF/IDF vector retrieval with simple thesaurus, or (3) keyword extraction. One component of RETRO is the graphical user interface (GUI) for use in initiating a requirements-tracing project (a pair of artifacts to be traced to each other, such as a requirements spec and a design spec). Once the artifacts have been specified and the IR technique chosen, another component constructs a representation of the artifact elements and stores it on disk.

Posted in: Briefs, TSP

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