损耗

The problem of uniqueness in 3D electromagnetic field computation using magnetic vector potential A as the variable is studied in this paper.

本文结合具体的工业课题，主要进行了棱边有限元法的基础理论及其在三维非线性涡流场及损耗问题中的应用研究。

In the fourth chapter, using the magnetic vector potential as the unknown variable, a mathematical model for numerical calculation of the magnetic field and loss distribution in 3-phase 5-limb transformer core is presented.

第三章针对变压器铁心结构的特点，对各向异性非线性边值问题的有限元分析方法进行了详细的阐述，并推导出了实用的N-R格式及单元分析格式，对具有多媒质单元的有限元分析方法进行了介绍，为变压器铁心磁场及损耗分布的数值计算奠定了基础。

It was found that after annealing at different temperatures for lb the static magnetic properties achieves the best velum at T=390℃ and the loss minimum at T=440℃. After annealing at T=440℃, transversal induced magnetic anisotropy develop for the sample of t=2h.

实验发现：经不同温度退火1h后，试样的静态磁性能在T=390℃呈现最佳值；损耗则T=440℃呈现最低值；在T=440℃经不同时间退火后，试样在t=2h呈现横向感生磁各向异性。

Mr Olken calculates that on average 28% of reportedspending went missing, mostly because roadbuilders skimped on materials. Notall of the gap can be put down to venality, though: some of the gravel, forexample, was probably worn away.

他算了一下：平均有28%的花费，不见了踪影，主要原因是道路建筑商偷工减料（当然，并不是所有的差值，都可以归因为腐败：譬如，有一些砂石可能会有损耗。

The subsequent reduction in core losses allows for very high electronic frequency operation and thus a high power density.

随后的磁芯损耗的减小允许很高的电频率工作，这样允许高功率密度。

Very low loss at high frequency,suitable for high current

高频损耗小，适用于大电流

This text introduce a sort of new pattern soft switch PFC circuit .First, analyze the develop course of the on-off power supply. Second, relate the harm of humorous wave to the commonality electricity net. Third, present the topology and the principium chart of the soft switch PFC and analyze it .At last ,set the parameter and simulates the converter of with matlab simulation. more over ,get the hold of well voltage and current wave , minish the spoilage of the circuit, enhance the efficience of the circuit, meet the demand of the miniaturization and viridity.

本文引入了一种新型的软开关PFC电路，首先分析了开关电源的发展历程，然后讲了谐波给公共电网造成的危害，再给出了这种软开关PFC的电路拓扑及原理图并对其工作原理进行了分析，最后对其参数进行设置在MATLAB软件进行了仿真，并得到了良好的电压电流波形，而且减小了电路的损耗，提高了电路的效率，实现了小型化，绿色化的要求。

The results show that the propagation delay is less than 1ns, the ratio of input and output impedance is up to 10〓, realizing a little insert dissipation at high-speed operation, laying a solid foundation for the materialization of high-resolution one-way analog switch A/D converter. 2. A new structure of the high-speed CMOS voltage comparator circuit for the improved nonoffset cancel circuit, which can satisfy the needs of the 8-bit linearity.

模拟结果表明，基于CMOS工艺实现的BiCMOS单向模拟开关的传播延迟小于1ns，开关的输入输出阻抗比高达10〓以上，实现了高速工作下的极小插入损耗，为实现高精度单向隔离模拟开关分步法A/D转换器奠定了基础； 2、基于满足八位线性要求的前提，本文提出了一种改进的无失调取消电路的高速CMOS电压比较器新结构。

However, the voltage drop of regulating transistors should be controlled at lower level because they work in linear region.

但因为调整管工作在线性区，这种方案有一个必须考虑的关键问题：线性调整管的管压降应控制在一定范围内以保证没有显著的损耗。

Therefore, it is an important theoretical focus that how to obtain the enough high block voltage or block gain meanwhile resolves the wastage efficiently in turn-off transient.

因此，如何在得到足够高的阻断电压的同时能有效减小关断损耗，成为目前急待研究的一个重要理论问题。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。