基于ARM和FPGA的CCD信号采集系统设计

为了构建数码复印机CCD单元的驱动及输出信号的高速采集、存储、传输和处理系统,应用FPGA完成CCD驱动和FIFO模块的设计。采用ARM为主控制器来完成对CCD单元、高速A/D单元、FIFO模块、高速存储单元和USB通讯的整体控制,构成了高速的数据采集、存储、传输和处理系统,实现了CCD图像信号的高速采集存储。经过上位机的图像处理测试平台,验证了基于ARM和FPGA的CCD信号采集系统设计的正确性和稳定性。     

高速CCD相机图像卡接口电路的设计

针对多通道CCD相机,提出了一种图像数据实时采集和图像显示的方法,CCD的数据采集和图像显示由图像卡完成.CCD相机与图像卡的数据传输的硬件接口按标准RS-422串行接口设计,这种差分方式传递信号方法能有效抑制共模信号,提高数据在传输中抗噪声能力.利用高速硬盘解决了大容量、高速度、多通道的图像数据的实时采集和存储问题,通过多线程处理来从软件上弥补硬盘读写速度不足的缺陷.将采集到的CCD相机数据转换成标准BMP文件来显示图像.     

基于Camera Link标准的图像采集处理系统及其应用

针对非接触在线高速实时检测的要求，提出了一种基于线阵CCD和DSP的图像采集处理系统．系统采用Camera Link接收器DS90CR288A将CCD输出的速度高达80MHz的低压差分信号（LVDS）转换成低压TTL（LVTTL）信号，然后将数据送入高速FIFO以协调CCD和DSP的时钟差异，最后采用EDMA方式将FIFO数据转存到SDRAM中，一幅图像传完之后中断DSP进行图像处理，MCU负责尺寸显示．实验结果表明，该系统达到了较高的测量精度．     

基于CCD相机的心脏电活动光学标测系统

光学标测系统由心脏电活动荧光信号采集和处理系统组成，主要包括光电二极管阵列激发光源、以及滤光片、CCD相机、数据采集卡和计算机．系统可自动完成图像采集、图像处理、实时显示及部分后处理工作，并成功标测到兔心室肌组织的细胞膜动作电位．这一系统可用于缺血诱发心律失常相关因素以及心脏除颤机理和参数选择等项研究，为心电心脏电生理和病理研究提供了一种新手段．     

面阵CCD驱动控制芯片LR38642及其应用

介绍了一款300万面阵CCD驱动控制的专用控制芯片——LR38642的特点,主要引脚功能以及工作原理.并结合实际调试,利用单片机实现其配置,NIOSII软核处理器实现其输出数字图像信号的采集以及相关图像处理,实验表明该驱动控制芯片可用于高速的实时图像采集以及与图像采集相关的嵌入式系统开发等领域.     

基于线阵CCD的数据采集系统的设计

本文介绍了线阵CCD图像传感器TCD1252AP在数据采集系统的构成及设计方案,并且设计了驱动脉冲电路,同时还给出了CCD输出信号的处理电路与D/A转换电路,并且利用单片机AT89C51对数据进行采集。     

具有智能端子的通用型数据采集系统

提出一种小型通用型数据采集系统的结构，输入端子可接任何形式的信号，如模拟量、开关量和脉冲量，输出信号采用分时传送方式输出，适用于各种生产过程的参量采集。     

一种基于AVR单片机的线阵CCD测量系统

线阵CCD(charge coupled device)用于精密光谱测量时,将会对与之配套的驱动和数据采集电路产生一些特殊要求.基于高速AVR单片机的驱动器和相关的数据采集系统可以在计算机程序中设定移位频率和积分时间,从而扩大了测试的光强范围和提高了信噪比,使CCD测量系统工作在合理状态.这一驱动器和数据采集系统用EPP(enhanced parallel port)协议与计算机通讯,与传统的系统相比较具有新的优点,是一种开创性的工作.该CCD系统已用于实验,文章最后给出了测量得到的汞灯的光谱.     

基于USB的电阻点焊数据采集系统设计

以电阻点焊质量在线监控为目的,对点焊过程中的重要信号参数进行采集和预处理,研制基于ADμC812为核心的高速、高精度、多通道的点焊信号同步数据采集系统,该系统利用集成化的USB接口、RS232串口模块,可在线调试参数特性,满足与上位机的高速通信,能够完成对电阻点焊机的输入电压和电流、输出电压和电流、电极位移等信号的高速采集及预处理.     

基于IIC总线的视频图像采集板

介绍一种基于IIC总线的视频图像采集板的设计方法,即将CCD摄 像头输出的视频信号解码成数字分量信号Y:U:V＝4:2:2格式,然后在控制电路的控 制下,输出标准的CIF、QCIF、SQCIF三种图像格式之一,并存入帧存储器.计算机模拟和示波器测试表明该设计是有效的.该图像采集板可用于基于PSTN(公共电话交换网)的可视电话系统的前端采集部分,也可根据所需图像质量选择三种图像格式之一用于监控系统.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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