The hot accretion flow (such as advection-dominated accretion flow) is usually optically thin in the radial direction, therefore the photons produced at one radius can travel for a long distance without being absorbed and heat or cool electrons at other radii via Compton scattering. This effect has been ignored in most previous works on hot accretion flows and is the focus of this paper. If the...

Sol–gel synthesis of powders consisting of regularly shaped submicron silica spheres (∅400–600 nm) is described. IR and absorption spectra of such powders have been obtained. The IR spectra demonstrate that the silica spheres heated at 800 °C are hydroxyl-free. The TEM measurements show that the dimensions of silica nanoparticles do not change during heating. Films of self-organized silica nano...

A DC thermal-electrical HBT model is presented in this paper. Only three parameters were needed to simulate completely an HBT with the self-heating effect, and it can be very easily implemented in any CAD softwares which use the SPICE BJT model. Parameter extractions have been carried out on several measured data and goodfittings were obtained over a wide temperature range. This model is ready ...

This work introduces the use of GradedChannel SOI MOSFETs to make analog current mirrors and compare their performance with those made with conventional fully depleted SOI transistors. It is demonstrated that Graded-Channel MOSFETs can provide higher precision current mirror with enhanced output swing. Also lesser modifications of the output characteristics due to the self-heating effect than i...

This thesis presents experimental work performed to develop a sensitive screening test procedure for biomass pellets, using isothermal calorimetry for direct measurement of the heat production rate. This method can be used to directly compare the reactivity, that is how prone the fuel is to self-heating, of different batches of biomass pellets. The results could be used for safety assessment by...

This work demonstrates that excess hot-carrier currents in SO1 MOSFETs are caused by self-heating. Self-heating-free Ism data should be used for dynamic lifetime extrapolation due to long thermal time constant. The underlying mechanism, increased impact ionization with temperature at low drain bias, is studied experimentally from the angle of thermal activation energy. Our study indicates that ...

We study the chemodynamical evolution of elliptical galaxies and their X-ray and optical properties using high-resolution cosmological simulations. Our Tree N-body/SPH code includes a self-consistent treatment of radiative cooling, star formation, supernovae feedback, and chemical enrichment. We present a series of ΛCDM cosmological simulations which trace the spatial and temporal evolution of ...

Gate-all-around (GAA) MOSFETs use multiple nanowires (NWs) to achieve target ION, along with excellent 3-D electrostatic control of the channel. Although the self-heating effect has been a persistent concern, the existing characterization methods, based on indirect measure of mobility and specialized test structures, do not offer adequate spatiotemporal resolution. In this paper, we develop an ...

Libbrecht and Libbrecht recently described a thermoelectric temperature controller for which they claimed an absolute accuracy of 100 mK. They did not specify the heat-dissipation coefficient for their thermistor temperature sensor-which would dissipate more power than is usual in such circuits- nor make any allowance for self-heating in the thermistor. Self-heating can be expected to have intr...

Full-thermodynamic device simulation solves drift-diffusion (DD), energy balance, and lattice self-heating equations simultaneously and the solution time is extensive. An algorithm to reduce the solution time is presented. The method uses a single lattice temperature to describe the self-heating in the whole semiconductor device. It is shown that the solution time is reduced by 20% and little e...