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  1. 煤矿排水电控系统设计

  2. 摘 要 高压软启动和PLC以广泛用于煤矿排水的电控系统中。该方法就是在恒定交流鼠笼异步电动机之间接入晶闸管作为交流电压控制器。采用恒流启动方式把异步电动机拖入正常运行状态。本文提出了PLC作为主机、高压软启动(电抗器备用)启动方案应用于煤矿排水电控系统 。与常规继电器控制系统不同之处采用PLC。PLC克服继电器体积庞大、可靠性不高、改变控制程序麻烦、维护量大、尤其定时不精确等缺点。与常规的直接启动或用电抗器启动不同之处采用高压软启动,克服了直接启动(电抗器启动)给电机直接加入额定电压,启动速度
  3. 所属分类:专业指导

    • 发布日期:2009-06-17
    • 文件大小:1mb
    • 提供者:jayzf0503
  1. Unsteady Turbulent Simulation and Pressure fFluctuation Analysi for Centrifugal Pumps

  2. Abstract:The pressure fluctuation in the flow passage of both impeller and casing is addressed on design condition. The initial conditions for the unsteady turbulent simulation are resulted from the steady calculations, and the three dimensional uns
  3. 所属分类:其它

    • 发布日期:2009-12-09
    • 文件大小:312kb
    • 提供者:benbenqiang
  1. Parker Pressure Sensor Manual

  2. Pressure Sensor SCPSD High Pressure 316 Stainless Steel
  3. 所属分类:网络设备

    • 发布日期:2010-12-29
    • 文件大小:213kb
    • 提供者:kueni
  1. 柴油发动机燃油喷射泵的建模和分析

  2. 柴油发动机燃油喷射泵的建模和分析 ABSTRACT−The Fuel-Injection Pump (FIP) used in diesel engine has a higher-pair cam-mechanism to pressurize the fuel for injection. This paper proposes a methodology to model FIP from a multibody Dynamics (MBD) perspective. The resul
  3. 所属分类:DOS

    • 发布日期:2015-05-19
    • 文件大小:738kb
    • 提供者:qq_28321845
  1. A193-A193M-2015.pdf

  2. Standard Specification for Alloy-Steel and Stainless Steel Bolting for High Temperature or High Pressure Service and Other Special Purpose Applications1。 This standard is issued under the fixed designation A193/A193M; the number immediately followin
  3. 所属分类:制造

    • 发布日期:2016-03-01
    • 文件大小:139kb
    • 提供者:baidu_34125709
  1. Raman scattering spectroscopic study

  2. Raman scattering spectroscopic study of n-tetradecane under high pressure and ambient temperature
  3. 所属分类:讲义

    • 发布日期:2018-01-31
    • 文件大小:510kb
    • 提供者:jianxing0302
  1. A novel experimental method to evaluate the impact of the volute's asymmetry on the performance of a high pressure ratio

  2. 蜗壳非对称性对高压比涡轮增压离心压气机性能影响的试验研究,林韵,郑新前,涡轮增压离心压气机由叶轮、扩压器及蜗壳组成,其中叶轮与扩压器为轴对称结构,而蜗壳由于其集气作用,则设计为非轴对称结构。采
  3. 所属分类:其它

    • 发布日期:2020-03-13
    • 文件大小:457kb
    • 提供者:weixin_38622467
  1. A first-principles study of the structural properties of jadeite at high pressure

  2. 高压下硬玉结构性质的第一性原理研究,樊孝玉,吴秀玲,The structural properties of jadeite are investigated using plane-wave pseudopotential density functional theory method. As a function of pressure, the monoclinic cell parameters w
  3. 所属分类:其它

    • 发布日期:2020-03-03
    • 文件大小:702kb
    • 提供者:weixin_38643407
  1. 高压扭转圈数对SiCp/Al复合材料组织和性能的影响

  2. 高压扭转圈数对SiCp/Al复合材料组织和性能的影响,薛克敏,钱陈豪,采用高压扭转(High-Pressure Torsion,HPT)工艺成功将8.75vol%-SiC颗粒与Al的混合粉制成金属基复合材料,并用金相显微镜、显微维氏硬度计、�
  3. 所属分类:其它

    • 发布日期:2020-02-29
    • 文件大小:692kb
    • 提供者:weixin_38663544
  1. 高压二氧化碳对苹果片榨汁特性的影响

  2. 高压二氧化碳对苹果片榨汁特性的影响,张立云,牛爽,研究了25 ℃时不同压强(10~30 MPa)处理20 min和10 MPa压强下不同处理时间 (10~50 min) 的高压二氧化碳(High Pressure Carbon Dioxide,HPCD)处理后苹
  3. 所属分类:其它

    • 发布日期:2020-02-25
    • 文件大小:390kb
    • 提供者:weixin_38500944
  1. Structural and elastic properties of γTiAl under high pressure

  2. 高压下TiAl 合金的结构和热力学性质,付*,Li Dehua,我们研究了高压下TiAl合金的结构和热力学性质,各向异性等。
  3. 所属分类:其它

    • 发布日期:2020-02-24
    • 文件大小:614kb
    • 提供者:weixin_38634065
  1. Tetragonal high-pressure phase of ZnO predicted from first-principles

  2. 第一性原理预测氧化锌的四方结构的高压相,李振伟,徐瑛,我们通过第一性原理晶格动力学计算预测了ZnO的一个具有四方对称性的高压相(B10)。这一结构可以由NaCl结构(B1)通过一个正交的Pmmn相变
  3. 所属分类:其它

    • 发布日期:2020-02-18
    • 文件大小:222kb
    • 提供者:weixin_38557727
  1. Property improvement of bio-oil by ultra-high pressure processing

  2. 超高压处理提高生物油品质研究,何荣海,叶晓飞,快速热解油由于其不良的理化性质在作为燃料应用前需要进行提质。本文探讨了连续超高压技术在提高柳枝稷生物油理化性质方面的应用
  3. 所属分类:其它

    • 发布日期:2020-02-16
    • 文件大小:230kb
    • 提供者:weixin_38734492
  1. Formation and properties of SrB6 single crystals synthesized under high pressure and temperature

  2. 高温高压合成SrB6单晶体的性质,辛圣炜,刘少存,Pure SrB6 single crystals are synthesized under high pressure (5 GPa) and temperature (1300 C). The structure and morphology of the SrB6 single crystals are characterized by X-ray
  3. 所属分类:其它

    • 发布日期:2020-01-08
    • 文件大小:531kb
    • 提供者:weixin_38703295
  1. high-pressure-torsion-源码

  2. high-pressure-torsion
  3. 所属分类:其它

  1. High-sensitivity FBG microphone with static pressure equalization and optimized response

  2. We present a high-sensitivity fiber Bragg grating (FBG)-based microphone with a flat response and static pressure equalization. A very high dynamic sensitivity of the microphone is achieved by a pressure sensing structure based on a carbon fiber diap
  3. 所属分类:其它

    • 发布日期:2021-02-22
    • 文件大小:890kb
    • 提供者:weixin_38651812
  1. Theoretical investigation of structural, mechanical and electronic properties of GaAs1-xNx alloys under ambient and high

  2. Theoretical investigation of structural, mechanical and electronic properties of GaAs1-xNx alloys under ambient and high pressure
  3. 所属分类:其它

  1. Human activity under high pressure: A case study on fluctuation scaling of air traffic controller’s communication behavi

  2. Human activity under high pressure: A case study on fluctuation scaling of air traffic controller’s communication behaviors
  3. 所属分类:其它

    • 发布日期:2021-02-11
    • 文件大小:457kb
    • 提供者:weixin_38556394
  1. High-sensitivity pressure sensor based on tilt fibre Bragg grating radial load effect

  2. In this paper, a simple and novel optical fibre pressure sensor with tilt fibre Bragg grating is put forward. The radial compression and rebound on tilt fibre Bragg grating (TFBG) cause grating angle and length change, meanwhile, its cladding mode sp
  3. 所属分类:其它

  1. High-strain InGaAs/GaAs quantum well grown by MOCVD

  2. High-strain InGaAs/GaAs quantum wells (QWs) are grown by low-pressure metal-organic chemical vapor deposition (LP-MOCVD). Photoluminescence (PL) at room temperature is applied for evaluation of the optical property. The influence of growth temperatur
  3. 所属分类:其它

    • 发布日期:2021-02-05
    • 文件大小:733kb
    • 提供者:weixin_38691669
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