Abstract We present a selective laterally wet etched collector InP/InGaAs/InGaAsP double heterojunction bipolar transistor (DHBT) with a quaternary step graded base collector structure. This device shows a DC current gain of = 70 over a large collector current range, a breakdown voltage of BVCE0 = 10.5 V, and a maximal collector emitter voltage of more than 5.5 V at 105 A/cm2 collector current ...

Abstract Solar collectors are devices that enable the use of solar radiation, e.g., for hot water preparation or space heating. They playing an increasingly important role in Europe and around world, mainly due to easy availability sun, as energy source. The advisability their depends on a number factors, which climatic conditions extremely one. This paper presents results simulations collector...

This paper describes the modeling of the resonant-tunneling hot-electron transistor (RHET). In the analysis of the resonanttunneling harrier, we solved the Schrodinger and the Poisson equations self-consistently. We simulated the electron transport in the base and the collector barrier region using the Monte Carlo method, taking account of the space charge in the collector barrier. Our model in...

This experimental study is intended to explore the heat performance of a novel vacuum tube heat collector with thermal storage. In order to enhance the heat transfer performance, we add radial metal fins to the U-tube which is used as the heat transfer channel of water. Meanwhile, in order to increase the thermal capacity of the heat collector, the heat collector model is designed to be larger ...

One of the effective methods to improve the thermal efficiency of solar collectors is using nanofluids as the coolant. The present study experimentally investigated the effect of SiO2/water nanofluid with 1% mass fraction on the performance of a symmetric collector, i.e. conical solar collector. The conical solar collector with 1 m2 area and normal to the earth was tested in Ahvaz, a city in th...

In this work, adsorption of the potassium amyl xanthate collector on the pure chalcopyrite surface was studied by applying atomic force microscopy (AFM). The adsorption experiments were carried out at different concentrations of the collector and at diverse pH values in the presence or absence of exterior ions. The changes occurring in the surface morphology of chalcopyrite due to the collector...

Solar chimney power plants are plants based on solar thermal power including three parts of collector, chimney and turbine, which is able to produce electrical energy. One of the effective parameters in increasing the power production is the collector angles versus horizon. In the present study, a numerical analysis of a solar chimney power plant for different angles of the collector (divergent...

We have designed and implemented a new garbage collector for the Standard ML of New JerseySystem (SML/NJ). This collector has higher performance, lower latency and generally requires lessphysical memory than the existing SML/NJ collector. In addition, it is able to exploit the largesecondary caches found on modern workstations. This paper describes the design of the collector,an...

We study an incorporation of generations into a modern reference counting collector. We start with the two on-the-fly collectors suggested by Levanoni and Petrank: a reference counting collector and a tracing (mark and sweep) collector. We then propose three designs for combining them so that the reference counting collector collects the young generation or the old generation or both. Our desig...