查询词典 current source

According to the demand of high magnetic field power supply, reference is increased with a set ramp rate and stops at a set stable value, so reference system is composed of digital setting and digit to analog converting circuit. But the stability of reference is mostly guaranteed by the performance of D/A circuit, so D/A circuit is particularly studied in reference system. The scheme of D/A circuit, the selection of DAC and its voltage reference, hardware anti-jamming design and PCB design are discussed in detail, and software of remote control and PLC are discussed in brief. Zero-flux DC current transformer well satisfies the demands of the high stability of Load current detection unit, so the principle of zero-flux DC current transformer is analyzed; in the mean time a project which detects the long term stability is designed. During 8 hours, analog signal which is detected with high precision digit multimeter is recorded in computer at 1HZ frequency by GPIB communication. The drift error source and related parameters are explained in the compare-amplify part. Detailed subtraction circuit is designed; also amplifier chip and periphery components are selected and verified according to the theory of error analysis.

根据强磁场电源的需求，参考源应按照软件设定的斜率逐渐上升到设定稳态值，则参考源系统应由数字给定和数模转换电路两大部分组成，而参考源的稳定度主要依靠完成数模转换功能的模拟电路的性能来保证，因此本文对参考源系统的研究以数模转换电路为重点，分别从电路方案的确定、数模转换芯片及其基准电压源的选取和验证、电路板硬件抗干扰和PCB设计几方面进行了论述，然后对数字给定部分的远控组态和PLC程序设计作了简要介绍；采用零磁通原理的直流电流转换器很好地满足了对负载电流检测单元高稳定度的需求，本文详细分析了零磁通检测的原理，并在选定此种类型电流转换器的基础上设计了一套检测长期稳定度的方案，8小时内以1秒为采样周期，通过计算机Labview程序和高精度数字电压表的GPIB通讯，将被高精度数字电压表数字化后的模拟信号采样值连续记录至计算机中；比较放大环节简要阐述了漂移产生的原因和相关参数指标，确定了具体的减法电路形式，并根据误差分析理论对运算放大器和外围元器件进行了选取和验证。

Results show that, in this process, there is a specific circulating current accompanying with twin typhoons, the easterly air current north of them and southwesterly air current south of them are transporting water vapor, its transport effects are very different at vary evolution stages of AERE, to contribute to the peculiarity of water source for this process of typhoon.

结果表明，本次过程由于伴随着双台风特有的环流形势，其北侧的偏东气流和南侧的西南气流对水汽输送的作用，在台风"艾利"发展的不同时期存在很大的不同，形成了这次台风过程特有的水汽来源特点。

The water of the Tsushima Warm Current is of multi source in summer: the Taiwan Warm Current, the branch of the Kuroshio, the mixed water of the Yangtse Diluted Water with the West Korea Coast Current.

夏季进入朝鲜海峡的对马暖流的来源是多方面的，其中有：台湾暖流、黑潮分支、长江冲淡水与西朝鲜沿岸流的混合水。

MC44144 Pinout: Flyback and Synchronous Rectifier Apps Provides Complementary Auxiliary Driver with Programmable Deadtime (Turn-On Delay) between AUX and MAIN Switches Peak Current-Mode Control with 0.5-V Cycle-by-Cycle Current Limiting Hiccup Mode 0.75-V Current Limit TrueDrivet 2-A Sink, 2-A Source Outputs 110-V Input Startup Device Trimmed Internal Bandgap Reference for Accurate Line UV and Line OV Threshold Programmable Slope Compensation High-Performance 1.0-MHz Synchronizable Oscillator with Internal Timing Capacitor Precise Programmable Maximum Duty Cycle PB-Free Lead Finish Package

MC44144引脚说明：反激式同步整流和应用服务提供补充辅助与可编程死区时间之间的辅助和主开关峰值电流模式控制0.5 - V的逐周期电流限制打嗝模式0.75 - V的电流限制TrueDrivet 2 - A号水槽，2 -阿源精确的线路过压阈值线UV和可编程斜率补偿高性能1.0 - MHz的振荡器可同步输出110 V输入启动装置边内部带隙基准，内置精密程控定时电容最大占空比无铅引脚完成包

COMPOSITE CORPORATION Balance Sheet 20X1- 20X2 (in $ millions) Assets Current assets: Cash and equivalents Accounts receivable Inventories Other Total current assets 20X2 $140 294 269 58 $761 20X1 $107 270 280 50 $707 Liabilities and Stockholder's Equity Current Liabilities: Accounts payable Notes payable Accrued expenses Total current liabilities 20X2 20X1 Fixed assets: Property, plant, and equipment $1,423 $1,274 -550 -460 Less accumulated depreciation Net property, plant, and equipment 873 814 Intangible assets and other 245 221 Total fixed assets $1,118 $1,035 $213 $197 The assets are listed in order 50 53 by the length of time it223 205 normally would take a$486 $455 firm Long-term liabilities: with ongoing operations to $104 Deferred taxes $117 Long-term debt 458 convert them into cash.471 $562 Total long-term liabilities $588 Stockholder's equity: Preferred stock $39 $39 Common stock ($1 per value) 55 32 Capital surplus 347 327 Accumulated retained earnings 390 347 Less treasury stock -26 -20 Total equity $805 $725 Total liabilities and stockholder's equity $1,879 $1,742 Clearly, cash is much more liquid than property, plant and equipment.

Total assets $1，879 $1，742 美国联合公司的资产负债表美国联合公司资产负债表 20X2 和20X1 (单位：百万单位：单位百万)资产流动资产：现金及现金等价物应收帐款存货其它流动资产合计固定资产：财产，厂房和设备减：累计折旧财产，厂房及设备净值无形资产及其它资产固定资产合计 20X2 $140 294 269 58 $761 20X1 $107 270 280 50 $707 债务负债债务和股东权益债务流动负债： 20X2 20X1 资产排列的顺序是根据在通$213 $197 应付帐款 50 53 应付票据常情况下企业持续经营将资205 223 应计费用$486 $455 流动负债合计产转化为现金所需要的时间长期负债：长度。长度。显然，现金比财产，厂房，显然，现金比财产，厂房，设备等的流动性要强得多。设备等的流动性要强得多。

The flood tidal current flows on the whole to the east along the coastline in an anticlockwise rotation with the maximum current velocity over 50cm/s, and the ebb current on the whole to the west with the maximum current velocity under 30cm/s.

海口湾潮流为往复流，涨潮方向基本向东，和岸线走向一致，呈反时针旋转运动，最大流速约50cm/s；落潮方向基本向东，呈顺时针旋转运动，流速小于30cm/s。

The controller estimates a three-phase motor current value by using a current detection value detected by the current sensor and a rotor rotation position, and controls the inverter by using on the motor current estimation value.

这里，用电流传感器检测出的电流检测值和转子旋转位置推定3相的电动机电流值，用该电动机电流推定值控制逆变器。

This design separately uses series linear constant voltage circuit, series regulate constant current circuit and the feedback type contravariant circuit to design direct current constant voltage power supply, direct current constant current power supply and DC-DC converter.

本设计分别用串联型线性稳压电路，串联调整式稳流电路和反馈式逆变电路设计直流稳压电源，直流稳流电源和DC-DC变换器。

The principle of constant power drive is: PD converts the change of output light power of laser diode into the change of diode current, and the change of current is feed back to voltage-current converser which adjusts output current of driver to compensate the laser diode.

这样，当激光器的输出光功率衰减时，驱动器相应的增大输出电流；当激光器的输出光功率增强时，驱动器就相应减小输出电流。对许多激光器应用来说，最希望脉冲输出，因为脉冲输出只有极小的结发热。

In reference to existing price models, a new price model--price formation model is formulated, which concludes that the price of current period product can be shown as the convex combination of unit product material consumption of the previous period and current period plus the convex combination of gross profit gained when the unit product of previous period and current period is sold at current period.

该模型表明，本期的产品价格可以表示成上期和本期单位产品物耗成本的凸组合与上期和本期单位产品在本期出售所获得的广义毛利的凸组合之和，这一结论是非常耐人寻味的。

Now she was hungry and angry.She began to smoulder.

现在她又饿又气，她开始流露难以抑制的怒火。

You have placed our iniquities before You, Our secret sins in the light of Your presence.

诗90：8 你将我们的罪孽摆在你面前、将我们的隐恶摆在你面光之中。