换相器

One or both of transmit and receive aperture controls may include preventing some element of the transducer array from transmitting or receiving, calculating weighting apodizations to combine with standard apodizations for each frame, or determining an aperture size based on an f-number for the transducer array for each frame.

发射和接收孔径控制中的一个或二者可以包括：阻止换能器阵列中的某个元件进行发射或接收，针对每一帧计算加权变迹以将其和标准变迹相组合，或者针对每一帧根据换能器阵列的F数来确定孔径尺寸。

The researches for investigating the influence of the inlet structure of the heat exchanger for two-phase flow on vapor-liquid maldistribution are reviewed.

介绍了低温两相流板翅式双相变换热器的结构和特点，回顾了板翅式换热器两相流体入口分配结构对其气液分配特性的影响。

Thus, the output will always be driven by a single transistor, either P- channel or N-channel. Since they are as closely matched as possible, the output resistance of the gate will always be the same, and signal behavior is therefore more predictable. Fig. 3.4 CMOS NAND gate One of the main problems with CMOS gates is their speed. They cannot operate very quickly, because of their inherent input capacitance. B-series devices help to overcome these 24 Lesson 3 CMOS Logic Circuit 25 limitations to some extent, by providing uniform output current, and by switching output states more rapidly, even if the input signals are changing more slowly. Note that we haven't gone into all of the details of CMOS gate construction here. For example, to avoid damage caused by static electricity, different manufacturers developed a number of input protection circuits to prevent input voltages from becoming too high. [3] However, these protection circuits don't affect the logical behavior of the gates, so we won't go into the details here. New Words and Phrases 1. CMOS abbr.

略语互补金属氧化物半导体(complementary metallic oxide semiconductor)逻辑，逻辑学，逻辑性，推理方法补充的，补足的，互补的电池供电的门电路，逻辑门，闸门，控制栅，大门，通道，门口，入口伏特，环骑，闪避基础的，基本的，主要的基本原则，基本原理增强型金属氧化物半导体场效应晶体管(metallic oxide semiconductor field effect transistor)反相器，反用换流器，变极器来源，水源，消息来源，原始资料，发起者源，源极排水沟，消耗，排水漏极排出，喝干，耗尽排水，流干，耗尽相同的，相配的，匹配的匹配有效地，有力地，事实上，实际上无限的东西无穷大无穷的，无限的，无数的，极大的接地的正向偏置的，正偏的或非 25 2。

This new type heat pipe was applied in a puddling process. The waste flue gas from the hot blast stove was used as the hot source to heat the cold mixture of compressed air and coal powder. The observed practical performance of the heat pipe showed a good agreement with the design expectation, which verified feasibility of using the separated type heat pipe for the heat transfer of the solid powder.

这种新型的分离式热管换热器应用于一个固相粉末换热系统——利用高炉热风炉的废烟气加热高炉喷煤用的空气和煤粉的混合物，实际运行工况与设计结果具有良好的一致性，可见利用套管结构的分离式热管作为以固相粉末为换热介质时的传热元件是完全可行的。

The results of theoretical analysis and simulation indicate that commutation converter based on New-Type converter transformer-Filter Commutated Converter have superiority on harmonic characteristics.

理论分析和数字仿真结果均说明了基于新型换流变压器的换相换流器—滤波换相换流器在谐波特性方面的优越性。

The capacitor commutated converter, that is CCC, can overcome the inherent drawbacks of conventional converters.

电容换相换流器能够很好地克服传统HVDC换流器存在的固有缺陷。

The relationship between currents of Filter Commutated Converter and the harmonic characteristics of multifrequency AC/DC interconnected systems based on New-Type converter transformer have been studied with ideal models by means of theoretical analysis and matlab simulation.

采用理想化的研究方法，通过理论分析和MATLAB仿真对滤波换相换流器的电流变换关系以及基于新型换流变压器的多基频交直流互联系统的谐波特性进行了系统的研究。理论分析和数字仿真结果均说明了基于新型换流变压器的换相换流器—滤波换相换流器在谐波特性方面的优越性

Taking the development platform of HVDC power transmission for example, the calculation result of impedance-frequency characteristic of traditional line commutated converter and that of FCC are compared. Simulation results show that the impact of impedance-frequency characteristic of converter on the resonance frequency of AC system is not negligible, and FCC can enhance the strength of AC system in a certain extent, improve system stability and effectively reduce AC equivalent impedance under resonance frequency, thus the harmonic instability of HVDC power transmission system can be avoided.

以直流输电开发平台为例，对传统电网换相换流器(line commutated converter，LCC)与FCC的阻抗频率特性计算结果进行对比，仿真结果表明换流器的阻抗频率特性对交流系统的谐振频率有着不可忽略的作用，FCC在一定程度上提高了交流系统强度，改善了系统稳定性，有效降低了系统谐振频率下的交流等值阻抗，从而更好避免直流输电系统谐波不稳定现象的发生。

Single-phase forced convective heat transfer inside tube is an important research realm in the technology of heat transfer enhancement. It plays an important part in saving energy and decreasing the volume and weight of heat exchanger.

管内单相流体强制对流换热是强化传热技术的重要研究领域，其在降低换热器的能源消耗，减小换热器的体积和重量起着十分重要的作用。

The association effect of inert gas and gas phase acetic acid-water in condensing process was considered, the heat and mass transfer behavior of the heat exchangers at every step and the influence of heat and mass transfer on the design of heat exchangers were analyzed for the condensing process of acetic acid, water, and mixed nitrogen vapor in the condenser in the PTA oxidation process.

针对PTA氧化反应中冷凝器内的醋酸、水和氮气混合蒸气冷凝过程，考虑冷凝过程中惰性气体和气相醋酸-水缔合效应，分析了各级换热器内传热传质行为以及传递对换热器设计的影响。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐