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84 条记录 (耗时 0.029 秒)

    Chromatographic system with mixer
    41.
    发明授权
    Chromatographic system with mixer 失效
    带搅拌机的色谱系统

    公开(公告)号：US5071562A

    公开(公告)日：1991-12-10

    申请号：US621648

    申请日：1990-12-03

    申请人： Robert W. Allington ,  John N. Jones

    发明人： Robert W. Allington ,  John N. Jones

    IPC分类号： G01N30/34

    CPC分类号： G01N30/34

    摘要： To prevent the solvents forming a gradient from mixing at the wrong place and to provide for accurate composition at start of the gradient in spite of solvent pressure variations, a microliquid or supercritical fluid chromatograph includes a combined mixer and pressure detector in which equal pressures of the two solvents in the gradient are detected by displacement of a ferromagnetic poppet in the mixing chamber. The poppet serves as a stop for the final solvent until the pressures are substantially equal and then its movement is detected by a circuit related to a linear variable differential transformer. The signal energizes a circuit which drives one of the sensing coils to drive the poppet during the gradient to provide mixing.

    摘要翻译： 为了防止形成梯度的溶剂在错误的地方混合，并且尽管有溶剂压力变化而在梯度开始时提供精确的组成，但微液体或超临界流体色谱仪包括组合的混合器和压力检测器，其中相同的压力 梯度中的两种溶剂通过在混合室中的铁磁提升阀的位移来检测。 提升阀作为最终溶剂的停止点，直到压力基本相等，然后通过与线性可变差动变压器相关的电路检测其运动。 该信号激励驱动其中一个感测线圈的电路，以在梯度期间驱动提升阀以提供混合。

    Method of making a frit
    42.
    发明授权
    Method of making a frit 失效
    制作玻璃料的方法

    公开(公告)号：US4966696A

    公开(公告)日：1990-10-30

    申请号：US368112

    申请日：1989-06-16

    申请人： Robert W. Allington ,  Abolghassem Y. Tehrani ,  John N. Jones

    发明人： Robert W. Allington ,  Abolghassem Y. Tehrani ,  John N. Jones

    IPC分类号： B01D15/08 ,  B01D15/22 ,  G01N30/60 ,  G01N30/74

    CPC分类号： B01D15/22 ,  G01N30/603 ,  G01N30/6017 ,  G01N30/6026 ,  G01N30/6052 ,  G01N30/74

    摘要： To reduce tailing, the frit at the outlet to the liquid chromatographic column has a diameter substantially equal to that of the inside diameter of the outlet end of the column and less than two millimeters. It is held directly against the packing of the column within a cylindrical member having a shoulder with a central aperture at least the size of the diameter of the frit and cylindrical walls which are fastened to resist force in the direction of the axis of the column from its inlet to its outlet. A gasket seals the cylindrical holder against the column wall. The frit is formed of gold-plated nickel spheres sintered together at temperature lower than the gold-nickel eutectic temperature of 950 degrees Celsius but above the phase-immiscibility temperature of 720 degrees Celsius. The size and shape of the frit is selected to reduce tailing by causing the flow path from the column to be uniform.

    摘要翻译： 为了减少拖尾，液相色谱柱出口处的玻璃料的直径基本上等于柱的出口端的内径，直径小于2毫米。 它被直接抵靠在具有肩部的圆柱形构件的圆柱形构件中，所述圆柱形构件具有至少具有中心孔的至少大小的玻璃料和圆柱形壁的直径的尺寸，所述玻璃料和圆柱形壁被紧固以抵抗在柱的轴线方向上的力 其入口到其出口。 垫圈将柱形保持器密封在柱壁上。 玻璃料由低于950℃的金 - 镍共晶温度但高于720℃的相不混溶温度在一起烧结在一起的镀金镍球形成。 选择玻璃料的尺寸和形状以通过使来自塔的流动路径均匀来减少拖尾。

    Chromatographic system
    43.
    发明授权
    Chromatographic system 失效
    色谱系统

    公开(公告)号：US4882063A

    公开(公告)日：1989-11-21

    申请号：US73079

    申请日：1987-07-13

    申请人： Robert W. Allington ,  John N. Jones

    发明人： Robert W. Allington ,  John N. Jones

    IPC分类号： G01N30/34

    CPC分类号： G01N30/34

    摘要： To prevent the solvents forming a gradient from mixing at the wrong place and to provide for accurate composition at start of the gradient in spite of solvent pressure variations, a microliquid or supercritical fluid chromatograph includes a combined mixer and pressure detector in which equal pressures of the two solvents in the gradient are detected by displacement of a ferromagnetic poppet in the mixing chamber. The poppet serves as a stop for the final solvent until the pressures are substantially equal and then its movement is detected by a circuit related to a linear variable differential transformer. The signal energizes a circuit which drives one of the sensing coils to drive the poppet during the gradient to provide mixing.

    Ground fault detector for high-voltage DC power supplies
    44.
    发明授权
    Ground fault detector for high-voltage DC power supplies 失效
    高压直流电源接地故障检测器

    公开(公告)号：US4809123A

    公开(公告)日：1989-02-28

    申请号：US851740

    申请日：1986-04-14

    申请人： Robert W. Allington ,  Larry J. Friling

    发明人： Robert W. Allington ,  Larry J. Friling

    IPC分类号： G01R19/165 ,  G01R27/18 ,  G01R31/02 ,  H02H3/16

    CPC分类号： G01R19/16571 ,  G01R27/18 ,  G01R31/025

    摘要： To detect a ground fault, the alternating current leakage current to common AC electrical ground is sensed across a resistor and applied to one input of an analog gate. The analog gate is opened by the positive going voltage from the high-voltage secondary of the power supply transformers between 7 degrees from the crossover point and 103 degrees to pass only that portion of the potential representing the alternating current leakage current which is in phase with the potential on the secondary windings of the power supply transformer and thus provide a signal representing the real component of the AC impedance to ground. A reference preset level of impedance and the signal from the analog gate are compared to provide a signal whenever the real component of the AC leakage current exceeds the preset value.

    摘要翻译： 为了检测接地故障，通过电阻器检测到对公共交流电接地的交流漏电流，并将其施加到模拟门的一个输入端。 模拟栅极由电源变压器的高压次级的正向电压在从交叉点7度到103度之间打开，仅通过表示与同相的交流漏电流的那部分电位 电源变压器的次级绕组上的电位，从而提供一个表示交流阻抗对地的实际分量的信号。 比较交流漏电流的实际分量超过预设值时，将参考预设电平的阻抗和来自模拟门的信号进行比较，以提供信号。

    Feedback system
    45.
    发明授权
    Feedback system 失效
    反馈系统

    公开(公告)号：US4733152A

    公开(公告)日：1988-03-22

    申请号：US838295

    申请日：1986-03-10

    申请人： Robert W. Allington

    发明人： Robert W. Allington

    IPC分类号： B01D15/08 ,  F04B49/06 ,  G01N30/32 ,  G05B19/40

    CPC分类号： G01N30/32 ,  F04B49/065 ,  G01N2030/326

    摘要： To provide smooth constant flow from a pump a feedback system comprises: a power means for the pump motor; positive and negative feedback loop means for controlling said power means; means for alternately energizing and de-energizing said positive and negative feedback control means; said negative feedback control means receiving a signal from said means for measuring flow rate and including means for comparing said signal with said corrected flow rate reference signal while said second feedback loop is energized to generate an error signal controlling said power means; and said positive feedback control means applying an acceleration voltage to said motor from a time a preset period after the initiation of a return stroke of said piston until after a timed duration.

    摘要翻译： 为了从泵提供平稳的恒定流量，反馈系统包括：用于泵马达的动力装置; 用于控制所述功率装置的正和负反馈回路装置; 用于交替地激励和断电所述正反馈控制装置的装置; 所述负反馈控制装置接收来自所述用于测量流量的装置的信号，并且包括用于在所述第二反馈回路通电时将所述信号与所述校正的流量参考信号进行比较的装置，以产生控制所述功率装置的误差信号; 并且所述正反馈控制装置从所述活塞的返回冲程开始到定时持续时间之后的预定时段的时间向所述电动机施加加速电压。

    Absorbance monitor
    46.
    发明授权
    Absorbance monitor 失效
    吸光度计

    公开(公告)号：US4587463A

    公开(公告)日：1986-05-06

    申请号：US534581

    申请日：1983-09-22

    申请人： Robert W. Allington

    发明人： Robert W. Allington

    IPC分类号： G01N21/01 ,  H05B41/00 ,  H05B41/24 ,  H05B41/292 ,  H05B41/38 ,  H05B41/36

    CPC分类号： H05B41/2925 ,  H05B41/38 ,  Y10S315/07

    摘要： To provide a reliable start for cadmium and zinc lamps and reduce baseline noise in an absorbance monitor, voltage pulses are applied to the primary of a transformer followed by shutoff of the primary current which discharges the energy stored in the magnetizing inductance of the transformer as three thousand volt peaks in its secondary in a series of timed steps. At the end of the timed period, the system shuts down unless it has approached operating frequency. The frequency is controlled by the amount of current passing through a gas discharge lamp in circuit with the transformer secondary and the frequency controls the amplitude of the voltage spikes. After warm-up, blanking pulses prevent optical noise from electrical-path-change oscillations within the tube. In one embodiment, a constant current source controls the current and in another, an operating current and frequency are established by the transformer leakage inductance and lamp characteristics in the circuit.

    摘要翻译： 为了提供镉和锌灯的可靠启动并减少吸光度监测器中的基线噪声，将电压脉冲施加到变压器的初级，然后关闭初级电流，将存储在变压器的磁化电感中的能量放电为三 其次要的千伏峰在一系列定时步骤中。 在时间段结束时，系统关闭，除非已经接近运行频率。 频率由通过变压器次级电路中的气体放电灯的电流量控制，并且频率控制电压尖峰的幅度。 预热后，消隐脉冲可防止管内电路变化振荡的光学噪声。 在一个实施例中，恒流源控制电流，另一个实施例中，工作电流和频率由电路中的变压器漏电感和灯特性建立。

    Measuring instrument
    47.
    发明授权
    Measuring instrument 失效
    测量仪器

    公开(公告)号：US4140396A

    公开(公告)日：1979-02-20

    申请号：US836053

    申请日：1977-09-23

    申请人： Robert W. Allington

    发明人： Robert W. Allington

    IPC分类号： G01N21/41 ,  G01N21/46

    CPC分类号： G01N21/4133

    摘要： To reduce errors in a measuring instrument caused by temperature effects from changes in the flow rate of fluids passing through the instrument, the flow of heat is adjusted to balance the flow-rate-dependent temperature increases against the flow-rate-dependent temperature decreases that occur with the same change in flow rate in each flow path. Some of the techniques for adjusting the flow of heat are: (1) controlling the temperature of the fluid at the inlet of the instrument with one heat exchanger and the temperature of the body of the instrument with another heat exchanger; (2) controlling the temperature of the walls of the instrument with a heating coil; and (3) emitting heat within the flow path from a transducer.

    摘要翻译： 为了减少测量仪器中由于通过仪器的流体的流量变化导致的温度影响的误差，调节热量以平衡流速依赖的温度升高与依赖于流速的温度降低， 在每个流动路径中以相同的流量变化发生。 一些用于调节热量的技术是：（1）用一个热交换器控制仪器入口处的流体温度，并用另一个热交换器控制仪器的体温; （2）利用加热线圈控制仪器壁面的温度; 和（3）从换能器在流路内发射热量。