Award Data

In this program, we will develop a breakthrough technology that will enable wafer-scale epitaxial lift-off (ELO) of GaN power device heterostructures from low-dislocation-density bulk GaN substrates. This technology will be used to provide a low-cost vertical junction field effect transistors (VJFETs) with high breakdown voltage (greater than 1,200 V) and high current capability (greater than 100 ...

To overcome the capability gaps of current ECH suspension and retention liners, Hy-Tek Manufacturing Co. Inc. (HMC) will rely on a novel approach that significantly attenuates the transfer of low and high velocity impact energy to the soldiers head by vectoring a portion of that impact energy along a geometric plane tangential to the soldiers head. Unlike the functionality of current suspension an ...

With renewed emphasis on energy efficiency, the Marine Corps currently employs radiant insulating barriers in the Expeditionary Shelter System of softwall shelters. These barriers provide an additional insulation value of R-4 consisting of layered textiles that insulate radiant heat and reflect radiant heat. The current barriers are thick and heavy which negates some of the energy savings because ...

A team at EP Purification has performed research for the development and commercialization of low-cost microchannel plasma reactor modules capable of efficiently producing ozone for water treatment and other environmental applications in a slim form factor and size. The conservation of water resources for human consumption is a growing national priority. Ozone is a unique purification agent as it ...

Composite materials have emerged as the materials of choice for increasing the performance and reducing the weight and cost of military aircraft. Nevertheless, reliable prediction of composites behavior in both static and cyclic load situations are far from complete, due to limitations of current analysis methods and to uncertainty and statistical variation of composite behavior under a given set ...

The use of directed energy at long distances, such as for aircraft defense, requires a high power (>100 W) light source within the mid-infrared spectral region (3-5 micron). Power scaling of individual quantum cascade lasers using 1-D and 2-D arrays seems to be a straightforward approach. However, this process is critically dependent on individual laser output efficiency and thermal management. Ex ...

Recent events such as the fire on the USS GEORGE WASHINGTON have shown that communications and decision making can have a dominant impact on scenario outcomes involving shipboard fires. The processes by which information is learned, disseminated, assembled, and processed have a direct effect on where, when, and what kind of response is mounted by the crew. Current recoverability simulations, such ...

This DOD Phase I STTR program would develop III-V multijunction based solar cells, using Virginia Tech"s InGaP/GaAs/InGaAs multijunction cells technique in combination with NanoSonic"s pioneering Hybridsil antireflection copolymer nanocomposite materials, which afford high levels of antireflection, temperature and abrasion resistance, impact durability and hydrophobicity (self cleaning). Such an a ...

Active Electronic Scanned Array (AESA) radars play a strategic role in surveillance and reconnaissance. A GaN based T/R circuit will be radiation-hard but difficult to integrate with the remainder of the signal chain due to incompatible technologies. SiGe HBT technology, with its high frequency performance and the ability to blend in with CMOS, can act as a bridge between the high frequency III-V ...

Most of current available methods for prediction of fatigue failure -such as cumulative damage models, cyclic plastic energy hypothesis, crack propagation rate models, and empirically-derived relationships -are based on empirical relations and their application requires many unknown parameters that must be experimentally determined or calibrated for specific locations/critical areas. Also, the afo ...