双管的

METHODS: On the basis of PMT passive voltage biasing circuit, Bipolar Transistor or Field Effect Transistor were used. Additionally,"adjustable constant current technology" was adopted to avoid the effect of temperature on circuit.

在电阻型光电路倍增管偏置电的基础上，增加双极型晶体管或场效应晶体管构成有源光电倍增管偏置电路；并采用可调恒流技术，以解决温度对电路的影响。

The current response of a generator/collector system based on a double-barrel micropipet was simulated by boundary element method , from which the collection efficiency for different pipets with different geometry was calculated.

初步探讨了双通道微米管作为产生/收集装置所涉及的理论及其传质过程，应用边界元法数值拟合了收集效率与管形之间的关系，通过加速离子转移实验对拟合结果进行了验证。

Department of Anesthesiology,Shanghai Pneumology Hospital,Shanghai 200433Abstract Objective:To observe airway pressure changes and meanings during transition from two-lung to one-lung ventilation in patients intubated with a double-lumen endotracheal tube.

临床麻醉学杂志001003 摘要目的：观察双腔支气管导管插管后，由双肺通气改为单肺通气时气道压力变化，并探讨其在判断DLT位置的意义。

Knowledge of tungsten anode X-ray tube spectra is essential for X-ray dose control, X-ray image quality evaluation and dual-energy X-ray imaging etc. A model-based tungsten anode X-ray tube spectrum reconstruction method is presented in this paper.

X射线球管光谱信息是进行X射线曝光剂量控制、X射线成像质量评估、X射线双能量成像等必不可少的，为此本文提出一种基于模型的钨靶X射线球管光谱重建方法。

SJSZ Series Conical Double-Screw Plastic Extruder, with relevant screw and auxiliary machine, can directly extrude all kinds of thermoplasticity plastic especially the hard PVC powder into pipes, plate, sheet, film, profiles and so on, can also finish process of reshaping of all kinds of plastics and pelleting of the powder.

今天来说说锥形双螺杆挤出机。SJSZ 系列锥形双螺杆挤出机，配以相应的螺杆和辅机。可将各种热塑性塑料特别是硬聚氯乙烯粉料直接挤出成管。

The drift and jitter of the output pulse are important parameters of the stability.The experiments and analyses based on homemade VE-4073 thyratron show that the combined effects of DC heating thyratron and two-pulse triggering technique can greatly reduce the drift and jitter of the pulser output.

利用国产VE-4073氢闸管进行了分析和实验研究，通过采用直流加热氢闸管灯丝和氢储存器，以及精确、稳定的双脉冲触发技术，大幅减小了开关脉冲发生器触发延时的抖动和漂移，48 h内开关脉冲发生器输出漂移仅6.1 ns。

After analyzing the performance anduncertainty of the DDPM vortex flowmeter in gas-liquid bubble flows, the vortexflowmeter-Venturi tube combinative method using the vortex flowmeter and the Venturi tube as measuring cells was put forward, the measurement model based on thevortex frequency and the Venturi differential pressure was established, and it showsthat the relative errors of this method for the mass flow measurement of bubble flowsare within±5%. Furthermore, the flowrate and volume void fraction of bubble flowswere obtained using a single DDPM vortex flowmeter through the relationshipbetween the frequency and amplitude of the circumferential DDPM signal, and resultsdemonstrate that the relative errors of the flowrate and volume void fraction of bubbleflows are within±5% and±10% respectively, which indicates the broad applicabilityof this method to large numbers of engineering fields.

通过分析管壁差压式涡街流量计在气液泡状流中的性能和不确定度，提出了以涡街流量计和文丘里管作为测量元件的&涡街—文丘里联合法&，建立了以涡街频率和文丘里差压为被测量的测量模型，该方法对气液泡状流质量流量的测量相对误差可达±5％；通过建立涡街周向管壁差压信号频率和幅度与被测流体的关系，使用单个涡街流量计实现了对气液泡状流流量和体积含气率的双参数测量，该方法对气液泡状流流量和体积含气率的测量相对误差分别为±5％和±10％，可以满足大量工业实际应用的要求。

This thesis deals with oil-water flow rate measurement using a venturi and develops a differential pressure-based two-phase flow rate measurement model, which does a terrific job with the use of a water fraction device. Meanwhile, Coriolis flow rate meter is also studied in the oil-water two-phase flow measurement and a SVM-based single-phase flow rate prediction method is proposed, realizing the prediction of single-phase flow rates. To overcome the disadvantages of both venturi and Coriolis flow meters, a double parameter measurement method is put forward, which combines the two meters and solves the problem of oil-water flow rate measurement. Last but not least, on the basis of the study of two-phase flow, a device for the separation of gas and liquid is designed and realizes the flow rate measurement of three-phase flow as oil, gas and water.

本文对文丘里管测量油水两相流流量进行了研究，建立了基于差压法的两相流流量测量模型，如果与含水率计相结合，可以较好的实现油水两相流的流量测量；同时研究了Coriolis流量计在油水两相流流量测量中的应用，提出了基于SVM的油水两相流分相流量预测方法，实现了油水分相质量流量的预测；针对文丘里管和Coriolis测量油水两相流存在的问题，提出了文丘里管和Coriolis流量计相结合的双参数测量方法，并实现了油水两相流的流量测量；最后，在对油水两相流研究的基础上，设计完成了一种气液分离装置，实现了油气水三相流的流量测量。

MAX1999EEI Pinout: 8- to 32-bit and 16- to 32-bit word packing options Programmable wait state options: 2 to 31 CCLK Digital audio interface includes six serial ports, two pre- cision clock generators, an input data port, three programmable timers and a signal routing unit Serial ports provide: Six dual data line serial ports that operate at up to 50 Mbits/s for a 200 MHz core on each data line each has a clock, frame sync, and two data lines that can be configured as either a receiver or transmitter pair Left-justified sample pair and I2S support, programmable direction for up to 24 simultaneous receive or transmit channels using two I2S compatible stereo devices per serial port TDM support for telecommunications interfaces including 128 TDM channel support for telephony interfaces such as H.100/H.110 Up to 12 TDM stream support, each with 128 channels per frame Companding selection on a per channel basis in TDM mode Input data port provides an additional input path to the DSP core configurable as either eight channels of I2S or serial data or as seven channels plus a single 20-bit wide syn- chronous parallel data acquisition port Supports receive audio channel data in I2S, left-justified sample pair, or right-justified mode Signal routing unit provides configurable and flexible connections between all DAI components, six serial ports, an input data port, two precision clock generators, three timers, 10 interrupts, six flag inputs, six flag outputs, and 20 SRU I/O pins Serial peripheral interface Master or slave serial boot through SPI Full-duplex operation Master-slave mode multimaster support Open drain outputs Programmable baud rates, clock polarities, and phases 3 Muxed Flag/IRQ lines 1 Muxed Flag/Timer expired line ROM based security features: JTAG access to memory permitted with a 64-bit key Protected memory regions that can be assigned to limit access under program control to sensitive code PLL has a wide variety of software and hardware multi- plier/divider ratios JTAG background telemetry for enhanced emulation features IEEE 1149.1 JTAG standard test access port and on-chip emulation Dual voltage: 3.3 V I/O, 1.2 V core Available in 136-ball BGA and 144-lead LQFP packages Lead free packages are also available

MAX1999EEI引脚说明： 8 - 32位和16 - 32位字包装选择可编程等待状态的选择：2至31个CCLK数字音频接口包括6个串行端口，两个前643时钟发生器，输入数据端口， 3可编程定时器和一个信号路由单元串行端口提供：六双串口数据线，在高达50 Mbps的操作/为200兆赫的每个数据行每个人都有一个时钟，帧同步的核心秒，和两个数据可以作为任何一个接收器或发射器对左对齐和I2S配对样本的支持下，最多可同时接收或传送24个频道，每使用两个系列的I2S兼容立体声设备配置可编程方向线；港口的TDM通信接口，包括支持128个电话接口的TDM的渠道，如H.100/H.110支持多达12个的TDM流的支持下，每帧128个频道每个压缩扩展每通道的基础上选择在TDM模式输入数据端口提供了一个额外的输入路径的DSP核心配置为I2S或串行数据或7加一个20位宽的SYN -异步的并行数据采集接口通道或8通道；支持接收通道I2S音频数据，左对齐样本对，或右对齐模式信号路由单元组件之间提供所有戴配置和灵活的连接，6个串行端口，一个输入数据端口，两个精密时钟发生器，3个定时器，10个中断，六旗投入，产出6个旗，20曼谷南南区域股的I / O管脚串行外设接口的硕士或奴隶通过SPI串行启动全双工运作主从模式多主机支持开漏输出可编程波特率，时钟极性和第三期合并调制旗/ IRQ线路1合并调制旗/定时器过期线光盘的防伪特征：JTAG的访问与64位受保护的关键允许内存内存可分配给程序访问控制的限制下对敏感地区有一个代码锁相环/遥测分比率为背景的JTAG仿真功能增强的IEEE 1149.1 JTAG标准测试访问端口的软件和硬件多钳各种各样和片上仿真双电压：3.3六/输出，可在1.2 V核心136球BGA封装和144引脚LQFP封装无铅封装，也可

TDA4864 Pinout: 8- to 32-bit and 16- to 32-bit word packing options Programmable wait state options: 2 to 31 CCLK Digital audio interface includes six serial ports, two pre- cision clock generators, an input data port, three programmable timers and a signal routing unit Serial ports provide: Six dual data line serial ports that operate at up to 50 Mbits/s for a 200 MHz core on each data line each has a clock, frame sync, and two data lines that can be configured as either a receiver or transmitter pair Left-justified sample pair and I2S support, programmable direction for up to 24 simultaneous receive or transmit channels using two I2S compatible stereo devices per serial port TDM support for telecommunications interfaces including 128 TDM channel support for telephony interfaces such as H.100/H.110 Up to 12 TDM stream support, each with 128 channels per frame Companding selection on a per channel basis in TDM mode Input data port provides an additional input path to the DSP core configurable as either eight channels of I2S or serial data or as seven channels plus a single 20-bit wide syn- chronous parallel data acquisition port Supports receive audio channel data in I2S, left-justified sample pair, or right-justified mode Signal routing unit provides configurable and flexible connections between all DAI components, six serial ports, an input data port, two precision clock generators, three timers, 10 interrupts, six flag inputs, six flag outputs, and 20 SRU I/O pins Serial peripheral interface Master or slave serial boot through SPI Full-duplex operation Master-slave mode multimaster support Open drain outputs Programmable baud rates, clock polarities, and phases 3 Muxed Flag/IRQ lines 1 Muxed Flag/Timer expired line ROM based security features: JTAG access to memory permitted with a 64-bit key Protected memory regions that can be assigned to limit access under program control to sensitive code PLL has a wide variety of software and hardware multi- plier/divider ratios JTAG background telemetry for enhanced emulation features IEEE 1149.1 JTAG standard test access port and on-chip emulation Dual voltage: 3.3 V I/O, 1.2 V core Available in 136-ball BGA and 144-lead LQFP packages Lead free packages are also available

TDA4864引脚说明： 8 - 32位和16 - 32位字包装选择可编程等待状态的选择：2至31个CCLK数字音频接口包括6个串行端口，两个前643时钟发生器，输入数据端口， 3可编程定时器和一个信号路由单元串行端口提供：六双串口数据线，在高达50 Mbps的操作/为200兆赫的每个数据行每个人都有一个时钟，帧同步的核心秒，和两个数据可以作为任何一个接收器或发射器对左对齐和I2S样本对支持，最多可同时接收或传送24个频道，每使用两个系列的I2S兼容立体声设备配置可编程方向线；港口的TDM通信接口，包括支持128个电话接口的TDM的渠道，如H.100/H.110支持多达12个的TDM流的支持下，每帧128个频道每个压缩扩展每通道的基础上选择在TDM模式输入数据端口提供了一个额外的输入路径的DSP核心配置为I2S或串行数据或7加一个20位宽的SYN -异步的并行数据采集接口通道或8通道；支持接收通道I2S音频数据，左对齐样本对，或右对齐模式信号路由单元组件之间提供所有戴配置和灵活的连接，6个串行端口，一个输入数据端口，两个精密时钟发生器，3个定时器，10个中断，六旗投入，产出6个旗，20曼谷南南区域股的I / O管脚串行外设接口的硕士或奴隶通过SPI串行启动全双工运作主从模式多主机支持开漏输出可编程波特率，时钟极性和第三期合并调制旗/ IRQ线路1合并调制旗/定时器过期线光盘的防伪特征：JTAG的访问与64位受保护的关键允许内存内存可分配给程序访问控制的限制下对敏感地区有一个代码锁相环/分比率背景遥测的JTAG仿真功能增强的IEEE 1149.1 JTAG标准测试访问端口软件和硬件多钳各种各样和片上仿真双电压：3.3六/输出，可在1.2 V核心136球BGA封装和144引脚LQFP封装无铅封装，也可

I can not make it blossom and suits me

我不能让树为我开花

When temperatures are above approximately 80 °C discolouration of the raceways or rolling elements is a frequent feature.

当温度高于 80 °C 左右时，滚道或滚动元件褪色是很常见的特征。