Award Data

OBJECTIVE: Advanced pulsed power switching technologies are needed to enable future nuclear weapon effects (NWE) experimentation capabilities and concepts for the active interrogation of special nuclear materials (SNM). The objective of this research is to advance the state of the art of high-gain optically-triggered switches by increasing the current density (to>1000 A/cm) and voltage hold-off ...

High energy X-ray pulse sources used in nuclear weapons effects (NWE) tests can produce electromagnetic pulses through system generated electromagnetic pulse (SGEMP) effects. Improved diagnostics for NWE experiments is motivated by the need to accurately measure the test environment and to model the response of devices under test with reduced overall uncertainties in the presence of high energy X- ...

The result of this project will be a fully functional prototype of the Model 8686H Precision Resistance-Ratio AC Bridge. The unit is capable of measuring resistances from 0 to 400 ohms with better than 0.1 uohm resolution and an accuracy of better than +/-0.05ppm. The unit will have advanced features such as a built-in web-browser, USB interface and built-in complex functions. Examples of such com ...

This Small Business Innovation Research Phase II project uses the ¿smart-cut¿ methods to produce high performance and advanced functionality lithium tantalate pyroelectric sensors. Phase I has been devoted to feasibility demonstration of the ¿smart-cut¿ process, preliminary design studies for the advanced pyroelectric detectors and prototype device fabrication and testing. The Phase I ...

Detection of chemical and biological warfare agents in a real-world setting is an increasingly urgent problem. Many of the current state-of-the-art sensors are aqueous based and require large biomolecules, such as antibodies, to achieve binding of the target molecule and subsequent reporting of the binding event. These technical hurdles are a drawback when considering deployment of these technol ...

In the conduction of benchmark combustion experiments, a fuel spray nozzle that produces a steady-well-defined spray is needed. This fuel spray, of known properties, is a boundary condition for the atomization, mixing, and combustion which results throughout the combustor volume. Present spray nozzles use fluid turbulence, which is chaotic, to drive the spray formation. Because the turbulence ampl ...

Finish machining of structural ceramics can produce residual stresses, and subsurface defects (SSD) acting as stress concentrators, in the near-surface material. Residual stresses and SSD produced by machining affect the mechanical properties of ceramic components. In this context, it is essential that the residual stresses be properly quantified in ceramics, in order to establish suitable machini ...

While much of the data involved in product and order definition has been captured in standard electronic structures such as IGES and EDI, material and process specifications are still handled as amorphous, paper-based documents. The use of manual, text-based specifications is an extremely labor-intensive and time-consuming process. Specifications are an integral part of the product and order defin ...

A program is proposed to demonstrate the feasibility of developing a general computational fluid dynamics (CFD) method for predicting turbulent, multi-phase mixing and reacting fluid/particle dynamics for three-dimensional spray combustion systems. The method allows coupled flow, chemistry and polydisperse aerosol behavior to be calculated efficiently in a Eulerian reference frame. Dispersed dropl ...