Reduction of Effective Sputtering Yield by Honeycomb Structures

The sputtering yield of Mo honeycomb walls was compared with the yield of fiat walls in a d.c. Ar glow discharge. Under the experimental condition where the mean energy is approximately 1 keV and the angle of incidence of primary ions strongly distributed around normal, the yield is reduced by a factor of 20 to 30. Before and after the bombardment, the surface topography of the honeycomb targets was observed by a scanning electron microscope.     

一种基于单谐次角振动信号的内燃机工作状态监测新方法

分析了内燃机轴承低阶扭振振型特性;提出了单谐次准等差振幅模型。当内燃机轴系满足此条件时,提出一种利用曲轴低谐次扭振信号幅值监测内燃机工作状态的新方法。并以某机车柴油发电机组轴系为对象进行了应用研究,验证了本方法的实用性和诊断准确性。新方法不需要其他结构参数,简便易行,而且准确度高,适用广泛,有较强的工程实用价值。     

Bi1.5Zn1.0 Nb1.5O7栅绝缘层的SiO2修饰对ZnO-TFTs性能的影响

具有高介电常数的栅绝缘层材料存在某种极化及耦合作用,使得ZnO-TFTs具有高的界面费米能级钉扎效应、大的电容耦合效应和低的载流子迁移率.为了解决这些问题,本文提出了一种使用SiO₂修饰的Bi_1.5Zn_1.0Nb_1.5O₇作为栅绝缘层的ZnO-TFTs结构,分析了SiO₂修饰对栅绝缘层和ZnO-TFTs性能的影响.结果表明,使用SiO₂修饰后,栅绝缘层和ZnO-TFTs的性能得到显著提高,使得ZnO-TFTs在下一代显示领域中具有非常广泛的应用前景.栅绝缘层的漏电流密度从4.5×10^-5A/cm²降低到7.7×10^-7A/cm²,粗糙度从4.52nm降低到3.74nm,ZnO-TFTs的亚阈值摆幅从10V/dec降低到2.81V/dec,界面态密度从8×10¹³cm^-2降低到9×10¹²cm^-2,迁移率从0.001cm²/（V·s）升高到0.159cm²/（V·s）.     

钛酸锶钡/铋锌铌多层复合薄膜的制备及性能

采用溶胶一凝胶法在Pt/Ti/SiO2/Si衬底上制备了钛酸锶钡/铋锌铌多层复合薄膜样品.研究了不同退火温度下多层复合薄膜的结构、微观形貌及介电性能.结果表明:在退火温度高于700℃时,所得复合薄膜中会出现立方焦绿石结构的铋锌铌和钙钛矿结构的钛酸锶钡.750℃退火处理得到的多层复合薄膜,表面致密,无裂纹,其相对介电常数...     

Soft X-Ray Emission Optimization Study with Nitrogen Gas in a 1.2 kJ Plasma Focus

Measurement of soft x-ray emission from a low-energy plasma focus operated with nitrogen within the pressure range of 0.1–1.0 mbar is presented. The x-rays are detected by using an assembly of Quantrad Si PIN-diodes with differential filtering and with a multipinhole camera. In the 1.0–1.3 keV and 1.0–1.5 keV windows, the x-ray yield in 4 geometry is 1.03 J and 14.0 J, respectively, at a filling pressure of 0.25 mbar and the corresponding efficiencies are 0.04% and 1.22%. The total x-ray emission in 4 geometry is estimated at 21.8 J, which corresponds to the system efficiency of about 1.9%. The soft x-ray emission is found dominantly as a result of electron beam activity on the anode tip, which is confirmed by the images recorded by a pinhole camera.     

印制板行业水污染中铜的困扰

叙述印制板行业目前执行的水污染物排放的国家和地方标准,在污水处理中如何解决铜含量达到国家二级标准(1.0mg/L)和一级标准(0.5mg/L)的困扰,叙述铜对人体和动植物的毒害情况,世界各国污水排放铜的标准,提出了改变这种状况的建议。     

重度污染天气下大气颗粒物PM_(1.0)物理化学特征的透射电子显微镜研究

大气颗粒物样品采自徐州市区2013年12月~2014年1月间重度污染天气。采样期间PM1.0主要由烟尘颗粒、复合酸冷凝颗粒、硫酸盐颗粒、矿物颗粒、金属及金属氧化物颗粒等组成。本文通过透射电子显微镜(TEM)及能谱仪(EDS)给出的大气颗粒物PM1.0高分辨结构信息、颗粒相尺寸及化学相尺寸信息、颗粒相中不同化学相嵌布特征信息等,对组成颗粒相的化学相连生关系进行了比较系统的分析研究。分析数据表明,大气颗粒物PM1.0的颗粒模态转变过程与颗粒物形成过程的相关性较强。异相凝结颗粒中化学相物质结构类型的判别是识别颗粒成因及形成过程的重要因素。     

放射性药物内照射剂量计算软件(Ⅰ)--源器官衰变数的计算

为快速、准确的计算核衰变数，本工作在简要介绍计算模式的基础上提出了一个用VB6.0编制的专门软件BIKNC1.0。验算结果表明，该软件可用于实际计算核衰变数。     

Microsoft Access1.0报表生成及数据源生成探讨

概括地介绍了MicrosoftAccess1．0的报表及其报表数据源，着重地探讨了以查询query（调函数）做数据源生成的报表存在的问题及其解决方法，并以实例加以说明，为用户提出了应用建议．     

A GPU‐Adapted Structure for Unstructured Grids

A key advantage of working with structured grids (e.g., images) is the ability to directly tap into the powerful machinery of linear algebra. This is not much so for unstructured grids where intermediate bookkeeping data structures stand in the way. On modern high performance computing hardware, the conventional wisdom behind these intermediate structures is further challenged by costly memory access, and more importantly by prohibitive memory resources on environments such as graphics hardware. In this paper, we bypass this problem by introducing a sparse matrix representation for unstructured grids which not only reduces the memory storage requirements but also cuts down on the bulk of data movement from global storage to the compute units. In order to take full advantage of the proposed representation, we augment ordinary matrix multiplication by means of action maps, local maps which encode the desired interaction between grid vertices. In this way, geometric computations and topological modifications translate into concise linear algebra operations. In our algorithmic formulation, we capitalize on the nature of sparse matrix‐vector multiplication which allows avoiding explicit transpose computation and storage. Furthermore, we develop an efficient vectorization to the demanding assembly process of standard graph and finite element matrices.