选择交流电作为工业标准的原因很简单，在早期供电距离很短的电网里，交流电的损耗比直流电小。
The reason was that over the short distances spanned by early power grids, AC transmission suffers lower losses than DC. It thus became the industry standard.
由此导出变压器年运行费率、最低年运行费率、变压器最佳负载率以及变压器经济运行区宽和变压器损耗比的关系。
Then, relationships between the quantities mentioned above, the interval of economic operation and the loss factor of transformers are derived and discussed.
对于摄影两个都不是最佳选择，因JPG比无损耗png小得多，也只是最低程序损失一点画质。
Neither are optimal options for photography, as JPG is much smaller than lossless PNG with only minimal loss of quality.
该算法比传统算法简易，在驱动异步电机系统中产生较小的开关损耗。
This algorithm is simpler than the traditional algorithm, and less switch losses arise in the asynchronous motor system.
本文制备了三个不同形态比的卤化银乳剂，用介电损耗法和微波光导法分别测定了它们的离子电导和光电导衰变动力学。
The dielectric loss and the microwave photoconductivity methods were used to determine the ionic conductivity and the photo-electron decay kinetics of the emulsion microcrystals.
HF的稳定性导致了氟原子团的臭氧损耗的可能。氟原子团大约比氯原子团小三个数量级。
The stability of HF results in an ozone-depleting potential of the fluorine radical that is approximately three orders of magnitude less than that of the chlorine radical.
对阻尼器不同孔径进行了对比试验，试验结果表明：随着活塞孔径的增大，阻尼器的损耗因子和阻尼比减小，共振频率增加。
The experimental results show that the loss factor and damp ratio decrease, the resonance frequency increases with increase of the aperture of the piston in the damper.
这种光纤的纤芯折射率比包层基质折射率小，所以短波长时基模损耗迅速增大，使得光传输截止。
The index of the core is a little smaller than that of the cladding base material, so the fundamental mode loss of short wavelength increases rapidly and leads to the mode cutoff.
记下房间的不规则大小和形状，比正常损耗在悬挂之间，或者其他特殊情况下所消耗的数目都要大。
Note that rooms of unusual size or shape, greater than normal wastage during hanging, or other special circumstances may affect the amount needed.
比NH2B材料磁芯损耗更低，饱和磁通密度较高。
The power loss is lower than NH2B material with high saturation flux density.
请注意，聚乙烯电缆比PVC(聚氯乙烯)电缆具有低得多的损耗。
Note that the polyethylene cables offer much lower attenuation than PVC cables.
根据耦合模理论，分析了光纤耦合器的分束比、附加损耗等传输特性对FFTS的工作带宽和测量准确性的影响。
According to the coupled-mode theory, the impacts of fiber couplers transmission characteristics such as splitting ratio and additional loss, on the veracity and bandwidth of FFTS are analyzed.
增强工具电极材料的耐电蚀能力，降低电极损耗是微细电火花加工技术可靠、稳定且高效制造高深宽比微结构和器件的研究关键之一。
Enhancing electrical erosion resistance of tool electrode and reducing electrode wear is one of research keys to fabricate HARMs with micro EDM technology reliably, stably and efficiently.
要求变压器铁芯具有低的高频损耗，高动态磁导率，高饱和磁感应强度和低的剩磁比。
So the transformer core material is required to be the one with properties of low losses at high frequency, high dynamic permeability, high saturation induction and low remanence.
耦合器分光比、光纤环形腔中的损耗和噪声对复制效果有不同的影响。
The noise and loss of the system, as well as the coupling ratio, make different effects upon replication effect of optical periodic pulses.
故障定位或DTF模式指示驻波比或回波损耗水平在各点沿电缆长度和天线系统。
Fault location or DTF mode indicates VSWR or Return Loss levels at each point along the cable and antenna system length.
实验结果证明，系统电动机电流的谐波失真较小，直流母线电压利用率比常规的正弦波脉宽调制（SPWM）有了较大的提高，功率器件的开关损耗较小。
Test results proved that the motor had lower current harmonic, more efficient use of DC supply voltage than SPWM, less switch loss of power switch.
永磁同步电机与其它电机相比具有低转动惯量、高转矩电流比、低噪声、无励磁损耗等一系列的优点。
Compared with other motors, Permanent Magnet Synchronous motor (PMSM) has the advantages of low inertia, high torque-current ratio, low noise, no excitation loss.
根据具体的温度值，此损耗量比传统功率铁氧体材料的低15 - 54%。
Depending on the temperature this is 15 to 54 percent lower than the losses of conventional power ferrite materials.
脉冲延迟量和超前量比损耗系统大，可用于光速控制，克服了微环带有损耗时产生的光强损耗和脉冲畸变。
These results show that the resonator with gain can be used to control the speed of light and to overcome the pulse loss and distortion in dissipative resonators.
理论分析和对尺寸比1 ：2：3的三个壳体的数值计算表明 ：若材料损耗与频率无关 ，则损耗不影响相似性 ；
Theoretical analysis and numerical calculations for three shells with scale ratio 1:2:3 show that if loss factor does not depend on frequency it has no influence on simil…
这种折旧形式允许按百分比折旧，可以允许根据税务的律法在一个期间内交叉，不根据资产的实际损耗记入科目。
This form of depreciation allows percentage depreciation, possibly staggered within a period allowed by the tax authority, without taking into account the actual wear and tear on the asset.
这种折旧形式允许按百分比折旧，可以允许根据税务的律法在一个期间内交叉，不根据资产的实际损耗记入科目。
This form of depreciation allows percentage depreciation, possibly staggered within a period allowed by the tax authority, without taking into account the actual wear and tear on the asset.
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