旋转导向推靠控制系统研发及实验

为了研制推靠式旋转导向工具,研发了一套推靠控制系统。该系统由单总线电路、非接触单元、测量单元、液压单元和主控电路五部分组成,能通过单总线接收电能并与井下中控双向通信,基于电磁感应原理实现旋转部分与非旋转部分之间的非接触电能传输与信号传输,按照地面系统下传的指令利用力矢量分解原理计算三个翼肋油缸液压力大小,使用压力传感器测量翼肋油缸中的实际液压力并对液压力进行闭环控制。对研制的推靠控制系统进行了初步实验,验证了该系统的电能信号传输功能、推靠控制功能、耐高温及抗振性能等。研制的推靠控制系统达到设计目的,满足进一步实验的需求。     

红外线人体感应控制语音系统的研究

红外线人体感应单片机控制语音留言系统是由红外线人体感应模块、单片机控制系统及语音模块三部分组成.它主要是解决了对感应信号方向的识别,并对信号进行分析和处理,最终控制语音模块实现其功能.该系统的设计目的就是能够起到给人们语音提醒的作用,这一功能的实现类似于人们常见的电话留言装置.     

基于压力传感器的便携高原正压呼吸器设计

为了改善高海拔低压环境中人体的缺氧状况,研制了一种基于单片机控制的便携高原呼吸器系统.呼吸器由气泵电机、进/出气阀门、压力传感器和单片机控制系统及供电设备组成,结构简单轻便.该系统通过气泵电机将空气加压到适合人体的标准气压,单片机检测压力传感器信号,控制进、出气阀的开通和关闭来实现呼吸过程.通过高原实验对比,呼吸器能够很好地调节人体心率和血氧饱和度.     

基于SOPC技术的服装压力测量系统中自定义IP设计

为了测量服装作用于人体的压力,设计了一款基于SOPC技术的自定义IP核.IP核主要由ADC控制逻辑和FIFO组成,分别由VHDL硬件描述语言和SOPC Builder软件提供的LPM模块实现.实验结果表明,该自定义IP核设计可行,能够实现对服装压力的连续采集.     

随钻地层压力测量模拟试验装置研制

为自主研制随钻地层压力测量工具,研制了一套随钻地层压力模拟试验装置。装置由井眼环境模拟系统、模拟测量短节、操作控制系统和辅助系统四部分组成。该装置能够模拟地层压力环空压力之外,还可以提供高温高压试验环境。该装置可实现地层压力和环空压力0.1~70 MPa可调,控制精度0.1 MPa,环空压力上升梯度约为1.25 MPa/min,地层压力上升梯度约为1.56 MPa/min,温度范围为室温~125℃,温度控制精度1℃,温度上升梯度平均为1.6℃/min。并选用了两种不同渗透率岩心对随钻地层压力测量模拟试验装置进行试验,结果表明模拟装置各模块工作可靠,所测压力曲线能够反映地层压力参数。该装置为检验原理样机性能、揭示改进方向提供了技术支撑。     

以应变式传感器为核心的人体脉搏信号采集与处理

针对人体脉搏信号采集时不客观及噪声源过多的缺点,以微振动测试技术为依据,研制了由计算机控制、以应变式传感器为核心的多路脉搏信号采集系统,该系统旨在在确定的取脉压力下,采集到多路清晰的脉搏信号.该系统以应变式传感器为核心,通过调节气囊控制取脉压力,探头与人体直接接触,可以直接采集多处位置微振动信号.同时由于人体微振动的信号特点,在不同的信号采集环境下,需要对信号进行分析处理.选择使用经验模式分解及小波分析对信号进行处理,提取了人体微振动信号中的有用信息.结果表明,在不同取脉压力的前提下,通过测试可得其分辨力在0.01 N以内,相对误差在5%以内,线性度5%,达到了预期的设计精度要求,相比压电材料具有更高的稳定性与静态精度.     

电动车运动控制系统

该系统采用单片机AT89C51作为小车的控制核心,电路分为电机驱动模块、寻迹检测模块、显示及声光指示模块、角度测量模块等几部分。电机驱动采用PWM技术,灵活方便地对车速进行控制;接近开关用来检测小车轨迹;角度测量采用新型角度传感器来对小车俯仰角度进行测量。各种传感信号经单片机综合分析处理,同时显示行程时间,并进行声光提示。     

模拟电阻焊状态的接触电阻测量系统

设计了以VB6.0为软件开发平台,研华工控为硬件核心的接触电阻测量系统.该系统由压力控制、温度控制、接触电阻测量和数据采集控制4个部分组成.研制的测量系统能够在模拟实际电阻焊压力和温度状态下,对薄板接触电阻进行连续采集,并用曲线动态显示,为分析不同表面状态板材的接触电阻提供了硬件条件.     

多功能水声信号发生及数据采集显控系统设计

 针对水声信号复杂多变和数据采集卡价格昂贵等问题,提出基于声卡采集及虚拟仪器技术的多功能水声信号发生和数据采集显示控制系统设计方法,并以LabVIEW为设计平台,利用声卡及NI-DAQ设备实现对多功能水声信号的控制、发射、显示和对音频信号的采集、显示.系统不仅能够作为虚拟信号源产生所需信号用于水声发射机,而且能够利用声卡采集测量模拟音频信号并实时显示.将系统产生发射信号作用于水声功率放大器,结合实际应用验证,表明该系统能够有效实现对所需实际信号的发生与控制.本研究设计的控制输出及采集输入模块集成度高,通用性强,且减小了硬件开销,界面友好、价格低廉、操作简便,便于推广应用.     

基于C8051F020的心电测量系统设计

为研制一种能够在临床上使用的心电测量系统,以C8051F020单片机为采集控制中心,运用模拟信号采集和数字信号处理技术,实现心电信号的采集。完成了心电测量系统的设计,该系统具有实现各种控制、数据采集和A/D转换等功能。实验结果本系统运行稳定可靠,满足了临床准确采集心电信号的需要。     

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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