Environment

Nonlinear Swept Frequency Technique for CO2 Measurements Using a CW Laser System

The measurements would be used to significantly reduce the uncertainties in global estimates of CO2, improve climate models, and close the carbon budget for improved forecasting and policy decisions. Langley Research Center, Hampton, Virginia The U.S. National Research Council recently identified the need for a near-term space mission of Active Sensing of CO2 Emissions over Nights, Days, and Seasons (ASCENDS). The primary objective of the ASCENDS mission is to make CO2 column measurements across the troposphere during the day and night over all latitudes and all seasons, and in the presence of scattered clouds. These measurements would be used to significantly reduce the uncertainties in global estimates of CO2 sources and sinks, provide an increased understanding of the connection between climate and CO2 exchange, improve climate models, and close the carbon budget for improved forecasting and policy decisions.

Posted in: Briefs, TSP, Greenhouse Gases, Lasers & Laser Systems

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Sustainable Remediation Software Tool Evaluation

To advance the acceptance and incorporation of sustainable remediation metrics into the larger body of remedial work, the Center for Sustainable Groundwater and Soil Solutions (CSGSS) within the Savannah River National Laboratory (SNRL) created the Sustainable Remediation Initiative (SRI).

Posted in: Briefs, Briefs, TSP, Remediation Technologies

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Carbon Dioxide Removal via Passive Thermal Approaches

A regenerable approach to separate carbon dioxide from other cabin gases by means of cooling until the carbon dioxide forms carbon dioxide ice on the walls of the physical device has been developed. Currently, NASA space vehicles remove carbon dioxide by reaction with lithium hydroxide (LiOH) or by adsorption to an amine, a zeolite, or other sorbent.

Posted in: Briefs, Briefs, TSP, Energy Efficiency, Greenhouse Gases, Remediation Technologies

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Polymer Electrolyte-Based Ambient Temperature Oxygen Microsensors for Environmental Monitoring

An ambient temperature oxygen microsensor, based on a Nafion polymer electrolyte, has been developed. A challenge in the operation of Nafion-based sensor systems is that the conductivity of Nafion film depends on the humidity in the film. Nafion film loses conductivity when the moisture content in the film is too low, which can affect sensor operation.

Posted in: Briefs, Briefs, TSP, Energy Efficiency, Environmental Monitoring

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Spectroelectrochemical Instrument Measures TOC

A spectroelectrochemical instrument has been developed for measuring the total organic carbon (TOC) content of an aqueous solution. Measurements of TOC are frequently performed in environmental, clinical, and industrial settings. Until now, techniques for performing such measurements have included, variously, the use of hazardous reagents, ultraviolet light, or ovens, to promote reactions in which the carbon contents are oxidized.

Posted in: Pollution, Briefs, Briefs, TSP, Environmental Monitoring, Greenhouse Gases

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Nickel-Zinc Battery System Technology

Société de Conseil et de Prospective Scientifique (SCPS), located in Rosny-sous-Bois, France, developed a technology that allows the nickel-zinc battery system to work as close as possible to its theoretical performance, with a long cycle life.

Posted in: Briefs, Briefs, TSP, Batteries, Energy Efficiency, Energy Storage, Recycling Technologies

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Sliding Mode Pulsed Current Averaging IC Drivers for High-Brightness Light Emitting Diodes

Light Emitting Diode (LED) driver ICs associated with specific (uniquely operated) switching power supplies that optimize performance for High Brightness LEDs (HB-LEDs) have been developed. The LED drivers feature fewer external components and high power efficiency.

Posted in: Briefs, Briefs, TSP, Energy Efficiency, Greenhouse Gases

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