Physical Sciences

A Continuous-Flow, Microfluidic, Microwave-Assisted Chemical Reactor

In industrial synthetic chemistry laboratories, reactions are generally carried out using batch-mode methodologies, stepwise reactions, and purifications to generate a final product. Each step has an associated yield of both the reaction itself and of the final purification that is largely dependent on the procedure being used, and the scientist carrying out the procedure. Continuous-flow reactors are one way of streamlining the process. Furthermore, microwave-enhanced, or microwave-assisted, chemistry has been demonstrated to aid in many of these areas; however, scaling has been a traditional problem with this technique.

Posted in: Articles, Briefs, TSP, Physical Sciences, RF & Microwave Electronics, Instrumentation, Test & Measurement, Research and development, Chemicals
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Monolithic Dual Telescope for Compact Biaxial Lidar

A document discusses the Ultra Compact Cloud Physics Lidar, a biaxial lidar with a narrow receiver field of view. It requires tight optical alignment between the transmitter and receiver paths while flying on various aircraft over various temperatures and in the presence of vibration. To achieve optical crossover as close to the lidar as possible, the transmit and receive telescopes must be built very closely to each other.

Posted in: Tech Briefs, Articles, Briefs, TSP, Photonics, Physical Sciences, Optics, Optics, Vibration, Vibration, Aircraft
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Thermal Materials Protect Priceless Personal Keepsakes

Thermal protection technology used on the shuttles keeps valuables safe from fire.

Most of us cannot comprehend the task of building something to withstand temperatures over 4,000 °F, but NASA can. The space shuttles endured such temperatures when returning to Earth’s atmosphere because of aerodynamic heating, or heating due to the combination of compression and surface friction from Earth’s atmosphere. For the vehicle to survive these conditions, NASA constructed a complex thermal protection system (TPS) for the exterior of the shuttle.

Posted in: Articles, Materials, Physical Sciences, Fire
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