Physical Sciences

New Grasses Neutralize Toxic Pollution From Bombs and Munitions

UW engineers have developed transgenic grass species that can eliminate RDX, a toxic compound widely used in explosives that contaminates military bases, battlegrounds and some drinking water wells. (Photo: Dennis Wise/ University of Washington) On military live fire training ranges, troops practice firing artillery shells, drop bombs on old tanks or derelict buildings and test the capacity of new weapons. But those explosives and munitions leave behind toxic compounds that have contaminated millions of acres of U.S. military bases — with an estimated cleanup bill ranging between $16 billion and $165 billion. However, University of Washington and University of York researchers recently described new transgenic grass species that can neutralize and eradicate RDX — a toxic compound that has been widely used in explosives since World War II.

Posted in: News, Defense, Environmental Monitoring, Recycling Technologies, Physical Sciences

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Detecting Trace Levels of Explosives Using Vibrational Sum Frequency Spectroscopy

VSFS technology can also be used to check for explosive traces on packages and suitcases. The threat of improvised explosive devices (IEDs) to human life is grave, and countering this threat is a high priority for force protection during military operations. Remote, standoff detection of in-place IEDs would be a significant step forward in mitigating the threat posed by these weapons.

Posted in: Briefs, DTB, Aerospace, Defense, Physical Sciences, Sensors and actuators, Military vehicles and equipment

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Next-Generation Spectrometers for Rapid Analysis of Complex Mixtures

Spectrometers in chemical sensors are used in environmental and air quality monitoring, detection of hazardous gases and chemical warfare agents, and breath analysis in medical applications. Molecules have internal motions that are characteristic of their structure and identity. These motions can be studied by spectroscopy in different regions of the electromagnetic spectrum. Molecular spectra can be used as a “fingerprint” to unambiguously state whether or not a particular chemical is present and in what amount. As such, small portable spectrometers are frequently used as components of chemical sensors.

Posted in: Briefs, Aerospace, Defense, Physical Sciences, Sensors and actuators, Medical, health, and wellness, Chemicals, Hazardous materials, Test equipment and instrumentation

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Analysis of an In-Ear Dosimeter for a Single Hearing Protection Device

This data could help prevent permanent hearing loss in military personnel working in extreme noise environments such as those generated by jet aircraft. US national and many international hearing conservation programs (HCPs) have adopted a noise exposure criterion of 85 dBA for a time-weighted average of 8 hours, with a 3 dB per doubling exchange rate (safe exposure duration was cut in half for each 3 dB increase in noise level). Military personnel who work in extreme noise environments require high attenuation from hearing protection in order to complete a normal duty day without risk of permanent hearing loss. Improvements to both hearing protection and noise dose monitoring have been consistently recommended and pursued as a means to reduce risk for noise-induced hearing loss.

Posted in: Briefs, Aerospace, Defense, Physical Sciences, Noise, Noise measurement, Protective equipment

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Automatic-Alignment Fiber Optic Coupling System for Optimal Signal Transmission

This system tests the optical characteristics of waveguides on a silicon wafer. Using the current method of characterizing waveguides manufactured for research in optical communications, it can take up to 8 hours to characterize the waveguides on a single silicon wafer. Using the automatic computer automation system developed, the characterization process has been reduced to less than an hour. After the silicon wafer containing the waveguides is manufactured, the waveguides must be evaluated to determine the optical characteristics of the various waveguides on the silicon wafer.

Posted in: Briefs, Physical Sciences, Optics, Waveguides

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Detecting Maritime Radiological/Nuclear Threats with Hybrid Imaging

A stand-off detection system for maritime environments enables remote detection of nuclear materials. The SuperMISTI detection system is a hybrid detection, identification, and imaging system for sources of gamma-ray radiation at stand-off distances. The system is based on the Mobile Imaging and Spectroscopic Threat Identification (MISTI) system designed for the Department of Homeland Security. The SuperMISTI system uses the high-resolution spectra of high-purity germanium (HPGe) detectors to detect and identify gamma-ray sources as well as coded aperture technology, and lower-cost NaI detectors to image and localize the detected sources. The system utilizes a modular design to allow the detection/identification and the imaging/ localization portions to be used separately or together, depending on the situation.

Posted in: Briefs, Physical Sciences, Imaging and visualization, Marine vehicles and equipment

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Testing Particle Counters for Detection of Fuel Contamination

The use of automatic particle counters is prevalent in the hydraulics/hydraulic fluid industry. Fuel quality assurance is accomplished by conducting periodic fuel sampling for the condition monitoring of aviation fuel by detecting, measuring, and reporting the levels of contaminants in the fuel. Current methods have several drawbacks including operator subjectivity, lack of detailed analysis, limitations in providing reliable data, and the turnaround time needed to get the test results.

Posted in: Briefs, Physical Sciences, Aviation fuels, Quality assurance, Test procedures

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