对南方海相碳酸盐岩区勘探的思考

回顾、总结南方海相碳酸盐岩区４０余年的勘探历程、失利原因,借鉴四川盆地勘探经验教训,并结合该区具体构造演化过程,提出评价、成选下步勘探目标的途径和具体操作方法。研究表明区域盖层、古隆起、后期保存条件匹配良好的构造单元是下步有利的勘探目标。     

Attrition of porous glass particles in a fluidised bed

Fluidisation is frequently accompanied by unwanted attrition of the bed material. This paper focuses on the mechanical aspects of fines creation by attrition in fluidised beds supported by multi-orifice distributor plates. The attrition rates of low-density porous glass particles were measured; these particles show abrasive wear behaviour rather than breakage. Positron emission particle tracking (PEPT) was used to follow particle motion in three dimensions within the fluidised bed. For a single orifice distributor with background fluidisation, the attrition rate increased exponentially with increasing orifice gas velocity. For a multi-orifice distributor, however, attrition rates were roughly proportional to excess gas velocity, except near to a critical ratio of particle to orifice diameter; as this ratio approached 2, attrition was observed to increase by an order of magnitude. A method is proposed for estimating attrition rates from a combination of small-scale experimental results and theoretical calculations of distributor jet entrainment rates.     

基于Android技术的油田物资条形码跟踪管理系统

利用Android平台,结合ASP.NET技术设计一套以物资条形码为数据基础的油田物资条形码跟踪管理系统。给出系统总体结构和模块设计。采用条形码识别技术对井下工具实现信息采集和智能化辨识;利用无线数据传输技术与现有管理系统进行数据对接;应用JSON技术完成数据传输的优化和提速;通过GPS技术和GIS手段实现物资流转全过程的追踪和抽检。实践表明:该系统减少了设备的损耗和管理成本,提高了采油厂物资的科学、规范管理水平,提高了工作效率。     

Temperature gradients drive radial fluid flow in petri dishes and multiwell plates

Liquid in a Petri dish spontaneously circulates in a radial pattern, even when the dish is at rest. These fluid flows have been observed and utilized for biological research, but their origins have not been well‐studied. Here, particle‐tracking to measure velocities of radial fluid flows, which are shown to be linked to evaporation, is used. Infrared thermal imaging was used to identify thermal gradients at the air‐liquid interface and at the bottom of the dish. Two‐color ratiometric fluorescence confocal imaging was used to measure thermal gradients in the vertical direction within the fluid. A finite‐element model of the fluid, incorporating the measured temperature profiles, shows that buoyancy forces are sufficient to produce flows consistent with the measured particle velocity results. Such flows may arise in other dish or plate formats, and may impact biological research in positive or negative ways. © 2016 American Institute of Chemical Engineers AIChE J, 62: 2227–2233, 2016     

ST31型圆感应同步器数显表

ＳＴ３１型圆感应同步器数显表,是根据新颖的设计思想,采用脉冲调宽方案和可编程逻辑阵列ＧＡＬ器件面研制成的一种新型仪表,它具有较优的技术性能,其分辨率是１″,度±１″,尤其是最高测量角位移速度可达不少于４２ｒ／ｍｉｎ。     

电液伺服结构加载系统的神经网络直接自适应输出跟踪控制

本文利用神经网络的学习能力和非线性映射能力研究了电液加载系统的神经网络直接自适应输出跟踪控制方法，控制器是由一个具有反馈动力学的多层前馈神经网络及其学习算法组成。该控制器不需要被控对象的先验知识，也不依赖于被控对象的辨识模型，能快速跟踪对象的动力学行为，具有良好的自适应性和动态输出跟踪响应性能。     

CAPP系统关系数据库的设计

采用面向对象的方法分析了建立CAPP系统关系数据库的基本方法和原理,如何抽象CAPP系统对象,又如何将对象映射到数据库表。并且提出了建立CAPP系统元加工数据库的方法。     

箱形梁双丝自动跟踪焊接系统

介绍了一种利用数字式绝对位移传感器的二维焊接跟踪系统,实现了焊缝起始点寻位,过程跟踪,工件翻转的自动控制,达到了满意的焊接效果。     

机载光电跟踪平台伺服系统自抗扰控制

摩擦非线性造成机载光电跟踪平台伺服系统低速不平稳性,增加了系统的稳态误差.常规PID控制难以满足光电跟踪平台高精度伺服系统的性能要求.采用一种新的二阶离散系统最速控制函数设计自抗扰控制器,将它作为机载光电跟踪平台伺服系统的位置环控制器.实验结果表明,当系统跟踪幅值为0.5°、频率为0.159 Hz的正弦输入信号时,在0...     

基于多信息融合的运动目标跟踪方法

针对复杂环境下多运动目标跟踪的高冲突信息组合问题,在DSmT的理论框架下,提出了一种将局部冲突在局部进行分配的改进证据合并方法来研究多运动目标的跟踪问题.该方法通过深入分析冲突及其相关因素之间的关系,将目标的位置信息与颜色信息进行融合建立起多信息合并的运动目标跟踪模型.仿真实验结果表明:采用该方法可实现互遮挡条件下的多...