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Supercritical CO2 power cycles are being developed for both utility-scaled power generation applications, as well as smaller waste heat recovery applications. Supercritical CO2 cycles are more efficient than current cycles, and the associated turbomachinery components are significantly smaller than that for current steam turbine-based power generation. However, sCO2 cycles operate at a combination ...

Several automotive industry changes are leading to the need for wide-range, high-boost turbocharging systems. Engine emission requirements require good turbocharger performance over a very wide range of flow rates. Trends in engine downsizing require turbochargers to have both good high flow performance, and good low flow performance, to cover a wide range of engine rpm operation. Current methods ...

According to a 2014 study commissioned by the Department of Energy, hydropower from the more than 3 million untapped streams in the U.S. could potentially generate 65 gigawatts of electricity and help to reduce greenhouse gas emissions and pollution. However, the development of hydropower has been limited by several obstacles, as described by the U.S. Geological Survey: most of the prime locations ...

Optical limiters (OL) protect sensitive optical and electronic devices from laser-induced damage. The existing passive OL utilize nonlinear optical materials transmitting low-intensity light, while blocking laser radiation with intensity exceeding certain limiting threshold (LT). The common problem with the existing OL is that, at any particular frequency range, the choice of suitable nonlinear ...

Accelerators used for nuclear-physics research require megawatts of radio-frequency energy. They currently employ vacuum-tube power amplifiers or conventional solid-state amplifiers that are inefficient and therefore consume a great deal of prime power. Many other applications including semiconductor processing, cellular-telephone base station transmitters and military communication systems simila ...

Accelerators used for nuclear-physics research require megawatts of radio-frequency energy. They currently employ vacuum-tube power amplifiers or conventional solid-state amplifiers that areinefficient and therefore consume a great deal of prime power. Many other applications including semiconductor processing, cellular-telephone base station transmitters and military communication systems similar ...

Conventional indoor environmental monitoring technologies are expensive, cumbersome to install and maintain, and do not provide the distributed granularity required to capture the necessary details for efficient energy management of commercial buildings. Developments in wireless sensor networks (WSN) provide substantial framework for monitoring and addressing indoor environments at scale. However ...

ABSTRACT: A need exists for a reliable, low cost radiation-hardened, non-volatile (NV) memory in aerospace and defense applications and in reliable, long-life, high-speed NV memory for terrestrial and commercial applications. Present offerings can accomplish the objective, but only at the expense of performance, power, size, and weight. Recent refocus on magnetic memory technologies, stemming f ...

ABSTRACT: A need exists for a reliable, low cost radiation-hardened digital memory in aerospace and defense applications and in long-life, high-speed memory for terrestrial and commercial applications. Present offerings can accomplish the objective, but only at the expense of performance, power, size, and weight with device redundancy and shielding. Recent focus on Graphene and its capabilities ...

ABSTRACT: A refined volcanic plume model is proposed to evaluate improved forecasting of ash movement and dispersion. This refined model utilizes near real-time model calibration and validation, perspective satellite observation geometry, and future in-situ measurements for more accurate models and forecasts. BENEFIT: Aircraft safety utilizes coarse volcanic plume models and better models will ...