Aluminium and magnesium matrix composites are attractive lightweight materials with strength surpassing that of the corresponding metals. Recent years have seen extensive research aimed at finding ways to control structure metal obtaining new sets properties. This review aims show field-assisted sintering is a promising approach for powder metallurgy processing aluminium composites. The focuses...

J.M. Lehr, C.E. Baum, W.D. Prather and F.J. Agee High Energy Sources Division, Phillips Laboratory Kirtland AFB, New Mexico 87117 The Air Force is interested in compact ultra-wideband systems which utilize a minimum volume of high pressure gas. These desires lead us to look closely at single channel spark gaps, because both the size and volume of gas, for example, hydrogen, under pressure can b...

There has been much research devoted to improving the performance of data analytics frameworks, but comparatively little effort has been spent systematically identifying the performance bottlenecks of these systems. In this paper, we develop blocked time analysis, a methodology for quantifying performance bottlenecks in distributed computation frameworks, and use it to analyze the Spark framewo...

differential steering of in-wheel electric vehicle provides the functions of both active steering and power assisted steering with the coupling control of force and displacement transfer characteristic of system. a collaborative optimization model of the differential power-assisted steering system of in-wheel electric vehicle is built, with steering economy as the main system optimization goal,...

Apache Spark is an execution engine that besides working as an isolated distributed, in-memory computing engine also offers close integration with Hadoop’s distributed file system (HDFS). Apache Spark's underlying appeal is in providing a unified framework to create sophisticated applications involving workloads. It unifies multiple workloads, handles unstructured data very well and has easy-to...

the effects of unleaded gasoline and unleaded gasoline–ethanol blends on engine performance and pollutant emissions were investigated experimentally in a single cylinder, four-stroke spark-ignition engine with variable engine speeds (2600–3500 rpm). four different blends on a volume basis were applied. these are e0 (0% ethanol + 100% unleaded gasoline), e3 (3% ethanol + 97% unleaded gasoline), ...

in spark ignition (si) engines, the accurate control of air fuel ratio (afr) in the stoichiometric value is required to reduce emission and fuel consumption. the wide operating range, the inherent nonlinearities and the modeling uncertainties of the engine system are the main difficulties arising in the design of afr controller. in this paper, an optimization-based nonlinear control law is anal...