Quantum Corrected Monte Carlo Simulation of Semiconductor Devices Using the Effective Conduction-Band Edge Method

In recent years much effort has been devoted to the quantum mechanically corrected Monte Carlo simulation of nano-scale semiconductor devices. The effective potential and the Wigner or the Bohm quantum potential are usually chosen for making such quantum correction. In this study we propose another approach based on the Bohm potential by transforming the density gradient to an effective conduction-band edge gradient. Similar to the effective potential method, this method has the advantage of not being affected by density fluctuations. We have applied this method to the simulation of a double-gate nMOSFET. Results are compared to those obtained from the semi-classical Monte Carlo simulation without the quantum correction.     

A Quantum Correction Model for Nanoscale Double-Gate MOS Devices Under Inversion Conditions

A quantum correction model for nanoscale double-gate MOSFETs under inversion conditions is proposed. Based on the solution of Schrödinger-Poisson equations, the developed quantum correction model is optimized with respect to (i) the left and right positions of the charge concentration peak, (ii) the maximum of the charge concentration, (iii) the total inversion charge sheet density, and (iv) the average inversion charge depth, respectively. This model can predict inversion layer electron density for various oxide thicknesses, silicon film thicknesses, and applied voltages. Compared to the Schrödinger-Poisson results, our model prediction is within 3.0% of accuracy. This quantum correction model has continuous derivatives and is therefore amenable to a device simulator.     

压力容器壳体曲面造型与展开误差分析

采用基于特征的多面体造型方法，解决了压力容器壳体曲面造型的问题，同时，提出了一种筒体展开的算法，并进行了误差分析与修正。     

深部断失矿体的预测与勘探——通用地质坐标系应用实例(之三)

某热液金属矿床主矿体受两组断裂交叉线的控制,采矿中发现在-100m中段以下矿体被后期断层截断。运用通用地质坐标系列公式,可较好地解决深部断失矿体空间位置预测的问题。     

变压器隔离方式的安全栅

论文介绍爆炸产生原因,综合比较自动化仪表各种防爆方法,介绍了最切实有效,最安全可靠的本质安全防爆方法,以本质安全防爆的原理为基础,设计利用隔离变压器来实现安全区和危险区隔离的一种新型的无源隔离式安全栅.     

热电机组轴系热态不对中的振动响应与故障诊断

就某厂热电机组存在的由于轴系热态对中度变化,影响轴系振动与机组运行稳定的问题进行了分析和诊断.并在分析轴系不对中的旋转机械系统的振动机理的基础上,对机组的运行进行实际的考察和调整,得出了机组因轴系热态对中度变化及联轴器连接不良,激励产生的轴承振动响应而状态劣化的结论.     

变频调速技术在贵冶熔炼的应用

本文综述交流电动机变频调速技术在贵冶熔炼近年来的实际应用及对节能、环保的重大贡献。     

Design of a permanent magnetic circuit with air gap in a magnetic refrigerator

We calculate the magnetic field distribution of a permanent magnetic circuit with an air gap in a magnetic refrigerator by a finite-element method, and compare the field strengths of different structural parameters of the magnetic circuit. We show how the structure of the magnetic circuit can be optimized and present some approaches to improve the structure for a specific magnetic circuit. The main purpose is to provide basic parameters for the design of a practical magnetic refrigerator.