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We propose a new active optical method to measure time-domain waveform of THz pulse in the vicinity of the target in an omni-directional manner. This method utilizes the THz radiation-enhanced-emission-of-fluorescence from laser-induced air plasma to detect the THz field, which enables the standoff sensing for low volatility chemicals using THz spectroscopy. We have demonstrated its capability of ...

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NUCLEAR EXPLOSION INDUCED LIGHTNING (NEIL) REPRESENTS A POTENTIALLY SEVERE THREAT TO MILITARY SYSTEMS REQUIRED TO SURVIVE AND FUNCTION AFTER EXPOSURE IN THE SOURCE REGION OF A NUCLEAR EXPLOSION. WHEREAS THERE EXISTS SOME UNCERTAINTY ABOUT THE NATURE AND MAGNITUDE OF THE THREAT, ITS EXISTENCE IS CONCLUSIVELY DOCUMENTED IN THE FILM RECORD OF ATMOSPHERIC NUCLEAR TESTS IN THE PACIFIC DURING THE 1950'S ...

ADVANCES IN ELECTRONIC DEVICE TECHNOLOGY HAVE LED TO INCREASED PACKING DENSITIES WHILE POWER CONSUMPTION HAS DROPPED. IN GENERAL, THIS TREND IS BENEFICIAL TO AVIONICS AND SPACE APPLICATIONS EXCEPT THAT A NEW FAILURE MODE HAS ACCOMPANIED THIS MINIATURIZATION. IN HIGH ENERGY PARTICLE ENVIROMENTS, SUCH AS ENCOUNTERED IN SPACE, MICROELECTRONIC DEVICES HAVE BEEN SHOWN TO BE SUSCEPTIBLE TO TRANSIENT OR ...

EXTRINSIC PHOTOCONDUCTIVITY SEMICONDUCTOR SWITCHES (PCSS) BASED ON CVD DIAMOND-FILM (DF) HAS BEEN DEVELOPED. DIAMOND MATERIAL POSSESSES SEVERAL ADVANTAGES SUCH AS HIGH THERMAL CONDUCTIVITY AND HIGH BREAKDOWN VOLTAGES. THE PCSS BASED ON CVD DIAMOND CAN BE SUPERIOR THAN ITS COUNTERPARTS (GAAS OR SI) BY EXPLOITING THESE ADVANTAGES. CONVENTIONAL PCSS'S BASED ON GAAS SUFFER FROM PROBLEMS SUCH AS THERMA ...

Vexcel proposes a system for extracting terrain elevation from large stereo SAR databases using a priori elevation map data. This system will accelerate, automate, and improve the accuracy and robustness of radargrammetricnprocessing for data acquired from wide spectrum of existing and planned SAR platforms.

ADVANCED STRUCTURAL MATERIALS USED IN THE FABRICATION OF SUBMARINES CAN SUSTAIN LARGE STRAINS DURING THE FORMATION PROCESS CAUSED BY EXPLOSIVE LOADINGS. THE COMPUTATIONAL SOLID MECHANICS COMMUNITY HAS RECENTRLY RECOGNIZED SERIOUS SHORTCOMINGS IN CALCULATIONS USING MATERIAL MODELS IN THIS LARGE STRAIN REGION. BECAUSE OF THE IMPORTANCE OF CALCULATIONS IN UNDERSTANDING THE SHOCK RESPONSE OF SUBMARINE ...

We propose a stochastic-finite-element based methodology to address these requirements: (i) Characterize material variability; (ii) Quantify corresponding ground-shock variability; and (iii) Design instrumentation plan. The site is discretized into N finite-elements; rock properties over this domain are characterized as the components of an N-vector stochastic field. The probabilistic characterist ...

An approach for performing high fidelity modeling for blast and progressive collapse simulations of buildings will be developed. The modeling approach will allow complete simulations of building response to be performed within several days of computing time on desktop PCs. An 'easy to use' modeling interface will also be demonstrated in this effort. All response regimes will be addressed includi ...