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Tech Needs of the Week

A company is seeking new analgesic actives. Speed of effectiveness, toleration, and shelf-life are of particular interest. Analgesics vary in dosage load, dosage form, molecular size, speed of effectiveness, and side effects or toxicity. The form of the new proposed analgesic active is open to discussion. A minimum of pre-clinical data must exist. Click here for more info.

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Brain Wave Sensor



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The Technicolor Brain



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Rugged Wireless Sensors



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Current Attractions

The Aeronautics Research Mission Directorate at NASA's Glenn Research Center has developed a new silicon carbide differential amplifier integrated circuit chip that may provide benefits to anything requiring long-lasting electronic circuits in very hot environments. The chip exceeded 1,700 hours of continuous operation at 500 degrees C - a breakthrough representing a 100-fold increase in what has previously been achieved.

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Program for Computing Albedo

Simple Thermal Environment Model (STEM) is a FORTRAN-based computer program that provides engineering estimates of top-of-atmosphere albedo and outgoing long-wave radiation (OLR) for use in analyzing thermal loads on spacecraft near Earth. The thermal environment of a spacecraft is represented in STEM as consisting of direct solar radiation; short-wave radiation reflected by the atmosphere of the Earth, as characterized in terms of the albedo of the Earth; and OLR emitted by the atmosphere of the Earth. STEM can also address effects of heat loads internal to a spacecraft. Novel features of STEM include (1) the use of Earth albedo and OLR information based on time series of measurements by Earth Radiation Budget Experiment satellites in orbit; (2) the ability to address thermal time constants of spacecraft systems by use of albedo and OLR values representing averages over a range of averaging times; and (3) the ability to address effects, on albedo and OLR values, of satellite orbital inclination, the angle between the plane of a spacecraft orbit and the line between the centers of the Earth and Sun, the solar zenith angle, and latitude.

Posted in: Software, Briefs, TSP

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Time Analyzer For Time Synchronization and Monitor of the Deep Space Network

A software package has been developed to measure, monitor, and archive the performance of timing signals distributed in the NASA Deep Space Network. Timing signals are generated from a central master clock and distributed to over 100 users at distances up to 30 kilometers. The time offset due to internal distribution delays and time jitter with respect to the central master clock are critical for successful spacecraft navigation, radio science, and very long baseline interferometry (VLBI) applications. The instrument controller and operator interface software is written in LabView and runs on the Linux operating system. The software controls a commercial multiplexer to switch 120 separate timing signals to measure offset and jitter with a time-interval counter referenced to the master clock. The offset of each channel is displayed in histogram form, and “out of specification” alarms are sent to a central complex monitor and control system. At any time, the measurement cycle of 120 signals can be interrupted for diagnostic tests on an individual channel. The instrument also routinely monitors and archives the longterm stability of all frequency standards or any other 1-pps source compared against the master clock. All data is stored and made available for remote access via network connection.

Posted in: Software, Briefs, TSP

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