Three-dimensional vertical ZnO transistors with suspended top electrodes fabricated by focused ion beam technology

Three-dimensional(3D)vertical architecture transistors represent an important technological pursuit,which have distinct advantages in device integration density,operation speed,and power consumption.However,the fabrication processes of such 3D devices are complex,especially in the interconnection of electrodes.In this paper,we present a novel method which combines suspended electrodes and focused ion beam(FIB)technology to greatly simplify the electrodes interconnection in 3D devices.Based on this method,we fabricate 3D vertical core-double shell structure transistors with ZnO channel and Al₂O₃ gate-oxide both grown by atomic layer deposition.Suspended top electrodes of vertical architecture could be directly connected to planar electrodes by FIB deposited Pt nanowires,which avoid cumbersome steps in the traditional 3D structure fabrication technology.Both single pillar and arrays devices show well behaved transfer characteristics with an Ion/Ioff current ratio greater than 106 and a low threshold voltage around 0 V.The ON-current of the 2×2 pillars vertical channel transistor was 1.2μA at the gate voltage of 3 V and drain voltage of 2 V,which can be also improved by increasing the number of pillars.Our method for fabricating vertical architecture transistors can be promising for device applications with high integration density and low power consumption.     

视景仿真中液压挖掘机与地形的动态交互

液压挖掘机视景仿真系统通过采用ROAM算法动态管理和实时绘制地形网格,并利用Bezier曲面方法设定控制点的运动路径以逼近铲斗内土壤表面形状的方法,实现了液压挖掘机与三维地形的动态交互,逼真地实现了挖土和卸土效果的模拟。开发的视景仿真系统为驾驶培训人员提供了逼真的、具有高度沉浸感的虚拟内部操作场景,真实感强,具有极佳的交互性。     

关于连接梁的最优衰减率问题

研究具有耗散结点的连接梁的最优指数衰减率问题,该系统由于能量的衰减而导致弯矩在结点处间断,我们的方法是证明系统的一组广义征元生成状态空间的Riesz基,从而证明最优指数衰减率可由系统的谱确定。     

浅谈模糊动态聚类加权法

在不等精度的测量中或研究分析单参数与综合参数的关系时，人们常给予这些测得值以不同的权，即称加权。加权的权重通常是按经验法来选定的。为减少人为影响因素，提出一种从可测得值中进行模糊动态聚类分析求权的方法，从而提高加权精度，获得与实际一致的效果。     

山西雁北西部主要植被类型及其分布的初步研究

根据实地调查,作者将区内现状植被分为七个植被型,二十三个群系三十个群丛组。并简要地介绍了其分布,群落特征等。不妥之处敬请指正。     

EFFECT OF PROMOTERS(La,K,V,Zn) ON THE PHASE COMPOSITION OF COPRECIPITATED Fe-Mn CATALYST

By using Mossbauer Effect Spectroscopy ( MES ), effects of promoters (La, K, V, Zn ) on the phase composition of coprecipitated iron-manganese (Fe- Mn ) catalyst after calcination, reduction and FT synthesis have been studied. The mechanism of promotion has also been discussed.     

RESEARCH AND DEVELOPMENT OF FUEL ALCOHOL SYNTHESIS FROM SYNGAS

The research and development of catalyst preparation and catalytic technology for fuel alcohol synthesis from syngas have been conducted. The laboratory research work includes the investigation on the effects of preparation method, the composition and K2O content on the catalyst performance. The influences of reaction temperature, pressure, GHSV and feed composition on higher alcohols synthesis have also been investigated. On the basis of laboratory results, the catalysts have been further tesied in micro-pilot reactor under the industrial condition to investigate the effects of commercial preparation of catalyst, the reactor scaling up and (he use of industrial coal based syngas on the fuel alcohol ( mixture of methanol and higher alcohols ) synthesis. The catalyst stability has been tested by a 1000 h continuous operation. These provide the fundamental for further commercial plant design.     

Transmission Line Model Based CAD of Multilayer Dielectric Filters

A systematical procedure for multilayer dielectric filter design is introduced here based on the transmission line model (TLMBCAD). By this procedure, low-pass, high-pass, and band-pass filters can be designed in the same way. The transmission line model works well and is time efficient not only for normal incidence of linearly polarized wave but also for oblique incidence wave with circular polarization. Design examples are given for low-pass and band-pass filters. Simulation results show that the method developed in this paper is valuable for the engineering design of multilayer dielectric filters.     

双曲柄式160摄影机在战略靶场中的应用

文章叙述了靶场经纬仪中使用摄影机的类型与特点;指出更新的双曲柄式160摄影机具有技术性能高,操作方便,可靠性好等特点。经受了多种工作考验,为多种试验提供了高精度测量数据,最后给出了几种摄影机应用情况对照表。     

脉冲时滞抛物型方程解的振动性

本文研究了两类边界条件下有振动系数的脉冲时滞抛物型方程解的振动性,得到了若干解振动的判别准则。其结果即使用于有固定符号系数的方程,也显著地改进了已有的结果。