3140型压阻式微硅加速度计测试与分析

微型加速度计作为一种新型惯性传感器,它在体积、重量、成本、功耗、可靠性和寿命方面都具有传统加速计无可比拟的优势,３１４０型压阻式微硅加速度计是美国ＩＣＳｅｎｓｏｒｓ公司的产品。文中介绍了它的结构设计和工作原理,并对其重要性能参数进行了测试和分析。     

A Study of the Development of an Ultraprecision Grinding System for Mirror-Like Grinding

In this study, a new system of optimum in-process electrolytic dressing and a microposition system are developed. This system can carry out optimum in-process dressing of superabrasive wheels, and gives effective control of the unstable dressing current and insulating layer. Therefore, ultraprecision grinding when using an optimum in-process electrolytic dressing system and microposition system is a good method for efficient mirror-like grinding of brittle materials.     

双重各向异性介质的数值模拟方法研究

双重各向异性是多孔介质的一个基本性质,它对油藏流体的流动以及油气藏开发都有一定的影响,中首先建立了双重向向异性介质的渗流数学模型,然后给出了它的数值模拟差分方法,并编制了双重各向异性介质的两相三维油藏数值模拟软件（ daSIM),最后给出的5点井网计算实例显示了岩石双重各向异性对油气渗流规律的影响。     

矿山安全事故微机管理系统的建立

为实现矿山安全的现代化管理,开发了矿山安全事故微机管理系统,通过系统设计及各模块的设计,建立了一套较全面的管理系统软件。该软件已在现场应用,运行良好。     

Simulation of Nano Si and Al Wires Growth on Si(1O0) Surface

Growth of nano Si and Al wires on the Si(100) surfaces is investigated by computer simulation, including the anisotropic diffusion and the anisotropic sticking. The diffusion rates along and across the substrate dimer rows are different, so are the sticking probabilities of an adatom, at the end sites of existing islands or the side sites. Both one-dimensional wires of Si and Al are perpendicular to the dimer rows of the substrate, though the diffusion of Si adatoms is contrary to that of Al adatoms, i.e. Si adatoms diffuse faster along the dimer rows while Al adatoms faster across the dimer rows. The simulation results also show that the shape anisotropy of islands is due to the sticking anisotropy rather than the diffusion anisotropy,which is in agreement with the experiments.     

An instrument for online measurement of structural orientation in translucent polymer sheets

In many applications of polymer materials, a high tensile strength is required. There is a definite correlation between the degree of orientation of molecular chains achieved in the orientation process and the tensile strength obtained. In this work, we describe design and fabrication details of a device, ‘Laser based polymer orientation grader’, for online measurement of the degree of orientation to obtain a high consistent tensile strength as output. This instrument has been designed making skilful use of the optical anisotropic property of the oriented polymer strip. The principle is based on the fact that the spatial distribution of laser light passing through the translucent polymer sheet depends on the degree of orientation of long chain molecules in the sheet. The method has potential online application in monitoring and controlling of anisotropy in manufacturing processes.     

Pseudogap in the Normal State of Cuprates

We consider underdoped cuprates as disordered conductors. The diffusion coefficient D can be as low as 10^–5 m² s^–1. In these conditions, Coulomb interaction between electrons must be taken into account. The main effect is to open a dip and even a gap in the density of state (DOS) near the Fermi level (FL). We show that this model explains most of the observed features of the so-called pseudogap in the normal state and in particular its value, anisotropy, and variation with doping.     

储层精细研究技术在老区挖潜中的应用——以黄骅坳陷板南油区为例

黄骅坳陷 板南油区已进入开发中后期,寻找储量接替区是目前面临的重要问题。针对该油区断裂复杂、小幅度构造发育、储层薄而且变化快的特点,提出了储层精细研究的技术思路,旨在通过地震约束的等时小层对比、斜井空间校正、井震三维空间标定、小波域地震相干技术和真三维地震精细解释,解决小断层、小断块和微构造,和通过沉积相研究和岩性反演,解决单砂体的空间展布问题。运用该项技术的结果表明,本区油气受构造和岩性双重控制,层间构造发育,微构造、小断块内断层附近区域和前期解释遗漏的油砂体是增储上产的3个主要领域。根据该项研究成果在板南油区布署的3口井（B21-3井、B21-4井和N5-6井）均获得高产油气流,表明该项技术在开发中后期油田增储挖潜中具有推广价值。     

微米、纳米颗粒国家标准测量装置的研究

研究的目标是建立一套可溯源至激光波长的微米、纳米颗粒国家标准测餐装置,它用扫描电子显微镜高倍数放大、对准和定位颗粒影像,采用纳米位移扫描工作台和激光干涉仪测量微米、纳米量级的标准颗粒直径,其测量标准不确定度可优于5 nm+5×10~(-3).通过文中测量认证的标准颗粒校准各类不同原理和测量范围的颗粒测量仪器,达到各型颗粒测量仪器的量值准确和统一,并溯源至激光光波波长.     

激光二坐标测量装置显微视觉关键技术的研究

为满足二维线纹标准器高精度检测需求,研究了激光二坐标测量装置的显微视觉系统关键技术.分析了激光二坐标测最装置的工作原理和显微视觉硬件系统的构成,提出了一种基于方向链码的边缘特征点跟踪提取算法,实现了图像边缘快速精确提取,建立了两坐标系间的修正模型,提高了测量精度.实验验证二维线纹标准器线间距和线宽测量重复性的2倍标准差小于10 nm.