SPICE模拟纳米技术场效应晶体管圆角效应的建模技术

This paper presents a novel poly(PC)and active(RX)corner rounding modeling approach to SPICE simulations.A set of specially designed structures was used for measurement data collection.PC and RX corner rounding equations have been derived based on an assumption that the corner rounding area is a fragment of a circle.The equations were modified to reflect the gouging effect of physical silicon wafers.The modified general equations were implemented in the SPICE model to enable the model to describe the corner rounding effect.The good fittings between the SPICE model simulation results and the silicon data demonstrated in this paper proved that the designed corner rounding model is practical and accurate.     

模式识别和电视跟踪在前庭功能检查中的应用

应用模式识别和电视跟踪原理测量眼球在视靶信号刺激下的运动,为分析飞行员、车辆驾驶员的前庭功能提供一种先进的检查方法.采用均衡化、形态滤波和形心计算等方法实现了瞳孔区域的自动定位和实时跟踪;通过Harris角点检测和Lucas-Kanade光流跟踪实时测量出虹膜的旋转角度,为前庭功能分析奠定了良好的基础.通过实验验证,所介绍的眼球跟踪算法已达到了预期的效果,并已成功应用在前庭功能检查分析系统中.     

采煤工作面上隅角瓦斯治理方法

初采顶板未垮落时,容易造成隅角瓦斯超限,针对这种情况,通常的防治方法有3种,即:增加采面供风量,设置采空区风幛,仰角抽放及下巷瓦斯抽放。     

新型槽栅MOSFETs的特性

采用SIVALCO软件对槽栅与平面器件进行了仿真对比分析,结果表明槽栅器件能够有效地抑制短沟道及热载流子效应,而拐角效应是槽栅器件优于平面器件特性更加稳定的原因.对自对准工艺下成功投片所得沟道长度为140nm的槽栅器件进行测量,结果有力地证明了槽栅器件较平面器件的优越性.     

冷弯型钢垂直尖角成形方法研究

开发带有垂直尖角的新型冷弯型钢,对垂直尖角的成型,采用在转角处凸出圆弧、预留出多余材料的方法来补偿外圆角,然后精整成垂直尖角.本文对试验结果进行了分析和总结,为其他异形断面冷弯型钢在垂直尖角冷弯成型方面积累了经验.     

利用角点坐标计算图象的矩不变量

本文提出了一种直接利用角点坐标计算形状的方法，并导出了低阶矩的闭合形式，最后给出了计算M．K．Hu提出的七个矩不变量的算法。该算法计算的是经典不变矩的精确值，但大大地筒化了计算。     

Application of a Spectral Element Method to Two-Dimensional Forward-Facing Step Flow

In the present study, we investigate the two-dimensional laminar flow through a one-sided constriction of a plane channel with a ratio of h:H=1:4 (where h is the step height and H is the channel height). The computational approach employed is based on a mixed implicit/explicit time discretization scheme together with a highly accurate spatial discretization using a P _N –P _N–2 spectral-element method. It is well known that this so-called forward-facing step (FFS) flow exhibits a singularity in the pressure and the velocity derivatives at the corner point. We account for this singularity by a geometric mesh refinement strategy that was proposed in a hp-FEM context. A detailed numerical study of the FFS flow reveals that length and height of the recirculation zone in front of the step are almost constant for creeping flow. In the limit of high Reynolds numbers the length and height of the recirculation zone increase proportional to Re ^0.6 and Re ^0.2, respectively.     

管道中圆化突体绕流边界拟合坐标数值解法

本文利用边界拟合坐标变换计算管道边壁突体绕流的速度和压力分布。文中给出了流函数方程及边界条件的坐标转换形式和离散格式，采用了强隐式（ＳＩＰ）迭代法，分别对具有弓形和半弓形突体的直管进行了计算。与文献［１］中的试验和有限元计算结果对比，本文计算成果更接近于文献［１］中的试验结果     

Reissner夹层板的弯曲,稳定和振动问题的解析解

根据Reissner夹层板理论和胡海昌的简化计算理论,提出了夹层矩形板的弯曲、稳定和振动问题解析解的解答格式。应用此格式,可求解具有各种通常边界条件的Reissner夹层矩形板的弯曲、稳定和振动问题,并将这三类问题的解答格式归并为统一模式,从而使其解析解的求解方法规律化。     

线源激励二维理想导体角反射器辐射场严格解

采用模式匹配法,对平行电流丝或磁流丝作用下二维理想导体角反射器的电磁辐射进行了严格地电磁场分布。推导出了以散射场展开系数为未知量的矩阵方程,给出了计算实例,其中张角为１８０℃（即平板）的计算结果与文献［４］的结果是一致的。