闵28块E1f3滚动开发实践认识

闵桥地区E1f3构造复杂,断层发育,T31反射层不明显,滚动开发难度大.从闵28块油藏开发疑点入手,经过反复的地质构造再认识,使区域油藏规模扩大.认为老油田滚动开发需要反复认识,提出了开发中存在的疑点即为滚动开发的潜力的观点.     

基于ENC28J6O以太网控制器的SPI接口设计

为了解决传统的一对一的数据传输模式,同时改善以太网接口电路存在电路结构复杂、连线较多、容易出错的缺陷,在介绍全球目前最小封装的以太网控制器ENC28J60的特性、内部结构、引脚功能和主要寄存器设置的基础上,以ENC28J60为核心,结合单片机设计一种精简的以太网接口电路,并将此设计应用于智能抄表系统。由于ENC28J60采用SPI串行接口方式,不仅简化设计,而且具有很好的数据传输功能。     

基于STM32的校园能耗监控系统的以太网接口设计

本文针对校园能耗监控系统,介绍了一种基于STM32单片机和以太网控制器的以太网接口设计方案,阐述了STM32微处理器及ENC28J60芯片的功能和特点,并给出了系统的硬件和软件设计方案.根据该以太网接口设计一个在Web服务器上控制照明的测试,通过测试证明,该设计能够在校园能耗监控系统中进行信息的高速、远程传输,完成以太网接入功能.     

基于STM32的Web服务器系统设计

硬件平台以STM32F103VCT6嵌入式芯片作为控制核心,选择以太网控制器ENC28J60作为网络数据传输媒介。阐述了在该硬件平台下,在μC/OS-II实时操作系统的支持下,通过LwIP轻型协议栈,实现ENC28J60的网络数据处理,并移植FatFs文件系统,实现SD卡中Web网页的读取和存储,最后描述了通过Http协议访问Web服务器系统实现远程控制。     

KYN28A-12型中置柜与电容器“五防”衔接存在的问题及对策

防误装置作为技防措施在变电站防止电气误操作方面具有重要作用,但从目前KYN28A-12型中置柜与电容器“五防”衔接和配合情况看,还存在着复役操作中不能实现防止带接地线手动操作合断路器、远方操作合断路器强制闭锁等问题.从KYN28A-12型中置柜与电容器“五防”衔接的现状人手,分析了存在的问题,并提出了改进对策.     

Effect of substrate flexibility on dynamic wetting: a finite element model

Dynamic wetting plays an important role in coating processes. In this paper, we present a new finite element formulation that can predict the effect of substrate deformation on the location of the dynamic contact line. Our model solves for the fluid-structural interactions between an elastic solid and a viscous liquid with a dynamic contact line that can move across the deformable solid surface. Surface tension forces acting at the dynamic contact line pull outwards on the substrate and cause the formation of capillary ridge. To predict the shape of the capillary ridge and motion of dynamic contact line, our model uses arbitrary Lagrangian Eulerian (ALE) mesh motion in both fluid and solid phases, because ALE decouples the motion of solid and mesh points. In dynamic wetting of rigid solids it is known that a singularity arises at the dynamic wetting line due to a double-valued velocity. The singularity is often relieved by allowing a slip in a small contact region near the dynamic contact line. Dynamic wetting on flexible substrates involves a second singularity, which arises in the solid domain due to a line force acting at the contact line. The line force singularity is relieved by distributing the force over a finite contact region. Two ALE methods of mesh motion are implemented and compared. The variation of dynamic contact line position with respect to various parameters such as downstream pressure, contact angle, capillary number and elasticity number are presented for the finite element model and compared with an analytical model.     

Fractal-like Matrices

We introduce special sparse n×n-matrices (n=2 ^k ) containing up to 3 ^k ≈n ^1.585 nonzero elements. Their structure is inherited from the famous Sierpinski triangle and is not sensitive to matrix multiplication and inversion. The arithmetical complexity of taking product or inverse of such matrices is proved to be O(n ²).     

半自动生化分析仪中生化参数检测系统的设计

为了实现生化参数的精确检测,采用分光光度法检测样品对某种单色光的吸收程度,并根据反应过程中样品吸光度的变化来计算样品中待测成分的含量,从而得出检验结果。首先,入射光由光电二极管转换成微弱电流信号;然后信号经调理放大、模数转换后,送入单片机进行处理;最后,通过网络端口将测试结果传输给上位机（PC）进行处理,由上位机显示并生成数据报表。实验表明,该系统检测结果可靠、系统结构简单、使用方便。