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It can be regarded as a topology of phase-shifted SPWM technique in single-phase circuits.

文中提出了基于相移SPWM技术的级联型变流器。

In this paper,both the principle and the development of Single-phase and Three-phase Multi-function Electric Quantities Measurement Instruments are introduced.

本文介绍了单相和三相多功能电量检测仪器的测量原理和研制过程，并对仪器测量的误差进行了分析。

When the temperature is between 1100 and 500℃, second-formedγphase is observed in form of tiny spiculum. With the temperature decreasing, the volume fraction of second-formedγphase increases and then decreases at 500℃.

Ni_(56)Fe_(17)Ga_(25)Co_2合金在1200-1000℃间等温热处理时，γ相形貌和数量均无显著变化；温度降低到850℃时，γ相数量显著增加；500℃时γ相数量有所减少。

Another common single-phase AC motor is the split-phase induction motor, commonly used in major appliances such as washing machines and clothes dryers.

另外一种常见的单相交流电机就是分相感应电机，通常用于像洗衣机和干衣机这样的大型家用电器中。

With the main protection designs of six hydro-generators in Baise, Letan, Fengtan, Wawushan, Pengshui and Laxiwa power stations as example, the design process of hydro-generators with odd branches can be reduced to the main protection design of hydro-generators with three branches per phase and the usage of incomplete split-phase transverse differential protection is becoming significant.

0引言随着三峡、龙滩、拉西瓦等工程的相继建设，国内的水电建设已进入又一个发展高潮，水电机组正向着大型和超大型方向发展[1]；大型水轮发电机主保护配置方案的定量化设计已逐步被电厂和设计院所接受，从而为大型发电机组的安全运行提供了高质量的保证[2-6]。

The gas-phase flow characteristics of gas-solid two-phase flow in standpipe were investigated under negative pressure gradient.

对负压差立管内气固两相流的气相流动特性进行了分析，并基于滑落速度与空隙率的线性关系，建立了立管内气相速度的计算模型，给出了气体流量与相关参数的关联式。

Based on the solubility data, the phase diagram of the ternary system at 298K, 313K, 333K was obtained, which comprises one univariant curve and one stationary phase in crystallization region of K (C1, Br).

用等温溶解平衡法测定了三元体系K/Cl，Br-H2O三元体系298K，313K，333K时的相平衡数据，同时还测定了饱和溶液的密度、折光率等物化性质，依据湿渣法与X射线衍射相结合的方法对平衡固相组成进行了鉴定。

The approximate solution to FPK equation isobtained. The joint probability density function and stationary mean out-crossing rateare investigated for ship nonlinear rolling subjected to additive white noise excitation.Melnikov function and phase space flux are applied to analyze highly nonlinear rolland capsizing of ships in the random seas. The variation of phase space flux withrespect to the characteristic wave period, significant wave height and damping ofships is studied.

求FPK方程近似解，研究白噪声激励下船舶非线性横摇运动的联合概率密度函数及稳定期望穿阈率，应用Melnikov函数和相空间转移率研究船舶在随机波浪中的强非线性横摇运动及其倾覆问题，考虑波浪特征周期、有义波高及船舶阻尼特性的变化规律，推导了船舶在随机横浪中的极限波高的表达式。

The article covers the full research on such aspects as mathematic description, numerical analysis method and their practical applications. The diphase heating surface is divided into a hot water section, a evaporation section and a micro overheat section , the problems of model switching are avoided successfully between subcritical and supercritical working condition in the model of The diphase heating surface, and the model can be used for between subcritical and supercritical working condition without causing the model stiff infinity prick up problem. The mathematical model and dynamic characteristic account is unified and predigested for the diphase heating surface of once—through boiler under subcritical and supercritical pressure, and propose that the working conditions at phase change point could be used as divide criterion between water region and steam region under supercritical pressure, the problems are solved successfully between water and steam phase change point under supercritical pressure.

本文在过程的数学描述、数值分析以及实际应用等方面进行了系统的研究分析，将双相受热面统一划分为热水段、蒸发段和微过热段三段，所建立的双相受热面模型不但成功地避免了超临界工况与亚临界工况间的模型切换，而且消除了由区段划分欠妥所引起的模型刚性无限加剧的问题，统一并简化了超临界及亚临界压力下直流锅炉双相区段的数学模型和动态特性计算，而且提出了利用相变点工况作为超临界压力下划分汽水区域的标准，解决了超临界压力下水与蒸汽的相变点问题。

The properties of all phase composition s, types of main crystalline phase, sizes of grains and their distribution, properties of daily steatite ceramics were described in this paper.

叙述了日用滑石瓷结构中的各种物相比例，主晶相类型、粒径大小及其分布状态、性质，介绍了其具有晶体小、结构细微、光学性质相似，具有同质异构体的独特显微结构，探讨了显微结构与生产工艺、各项性能的相互依赖关系。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。