从几何光学理论证明了，在左手系材料（负折率材料）透镜中存在完善聚焦的概念。
The perfect focusing concept is proposed in lenses made of Left handed materials (or negative index materials) by means of geometrical optics.
比去年同期增长率掩盖了这一反弹事实，为了体现这一转折点，我们来看看各季度变动。
Year-on-year growth rates conceal this bounce; to spot the turning-point, look at quarterly changes.
他们将负折射率材料和正折射率材料级联起来成功实现了零折射率行为的纳米结构。
They then cascaded the negative index medium with a positive refractive index medium so that the complete nanostructure behaved as one with an index of refraction of zero.
然而，在折限率较低与交通量大的情况下，从本质上讲，与建设的最初成本没有关系。
However, at lower discount rate and heavy traffic flow the initial cost of construction is in essence irrelevant.
一些分析人士认为，美国在第二季度偏弱的GDP增长率(折年率2.4%)可能代表经济二次衰退的开始。
Some forecasters believe that America's disappointing GDP growth in the second quarter 2.4% at an annualised rate could be the start of a slide towards a second recession.
炭滑板经浸渍金属后，致密性、抗折强度、抗压强度、肖氏硬度明显提高，而开口气孔和电阻率降低。
The compactness bending strength, compressive strength, shore-hardness of carbon slides impregnated with metals were increased; while open porosity and electrical resistivity decreased.
在环状流下，A流路的贯通作用使折流板前后对应区域的含气率基本一致；
In annular flow the penetrating effect of stream A makes the void fraction same besides a baffle.
应用热膨胀测试、抗折强度测试和可见光透过率测试分析了微晶玻璃的性能。
The performances are studied by means of heat expansion testing, intension testing and visible light transmission testing and so on.
目的是从中找出内折产生的真正原因，在生产的各个环节进行有效控制，以减少内折，提高产品的一级品率。
The aim is to find the real reason making folds and effectively control the links in the producing in order to reduce the folds and improve the quality of finished product.
随着SPS掺量的增大，水泥净浆的吸水率和化学结合水量进一步减小，抗压强度、抗折强度和冲击强度进一步提高；
The water absorption and chemically combined water content continually decrease, and the compressive strength, bending strength and impact strength continually increase as SPS content increases.
摩尔偏析测量术通过测量探针光束经过不均匀介质后光线的偏折来估算介质的折射率。
Moire deflection measurement can be used to calculate refractive index by measuring deflection of probe beam passing through mediums.
下古生界烃源岩在西部坡折带及南北隆起区现今仍处于有效生油窗内（镜质组反射率小于1.3 % ）。
Nowadays, at the western slope and the northern and southern uplifts the Lower Paleozoic source formations are still in the active oil generation Rold ( R o< 1.3%).
试验证明，在普通的水泥砂浆中加入一定量的纤维能显著提高砂浆的抗裂抗渗，降低砂浆收缩率，提高抗压抗折强度等。
The test manifests adding a certain content of fiber in the mortar can obviously improve the tear and compression resistance, antipenetration and shrinkage.
结果表明：与碳化硅多孔陶瓷相比，碳化硅-堇青石多孔陶瓷的抗折强度显著提高，热膨胀系数明显降低，但显气孔率有所降低。
Results showed that compared with porous SiC ceramics, the MOR of SiC-cordierite was improved significantly, and the TEC decreased remarkably, and the apparent porosity also decreased.
本文应用平均相对形率系列的方法，对油松和巴山松的干形进行了分折比较。
Stem forms of p. tabuldeformis Carr. and p. henryi Mast, were Compared using the method of average relative form-rate series.
计算历史时期海岸线变化率常用的数学方法有端点法、平均速率法、线性回归法和折剪法。
The commonly used methods for calculating the shoreline change rate based on the coastal evolution history include end point method, average the method, linear regression method and jackknife method.
本论文的重要结论如下：1.V型煮茧机能降低缫折，降低内层落绪，降低长吐率，达到减少消耗的目的。
Important conclusions of this paper are following 1. The V type cocoon boiling machine could lower the depletion of filature, and attain the purpose of reducing the depletion.
方法：采用折干率实验及单株重测定，研究不同生长期川牛膝的产量；采用分光光度法对不同生长期川牛膝中川牛膝多糖进行含量测定。
Methods: Research the yield of radix cyathulae in different vegetal time by using experiments of the drying rate and mensuration on weight of individual plant.
煮茧触蒸前处理工艺优化与煮茧工艺优化相结合，是提高净度、增加产量、做小缫折、提高出丝率的有效措施。
A combination of optimum pretreating and optimum cooking assures improved neatness and silk yielding, and reduced cocoon consumption, thus production is enhanced.
引用折裂率的概念探讨牙折裂与年龄增长的相关性。
To discuss the relevance between tooth fracture and the age growing, the concept of fracture rate has been quoted.
结果煮制品与蒸制品在外观性状方面相似，在折干率、含水量、乙醇出膏率及总皂苷含量方面也处于较高水平；
Results The appearance was similar and drying rate, moisture content, yield rate of paste extracted by ethanol and total tubeimosides content were at a higher level in decocted and steamed Tubeimu.
利税折摊前的回报率在20%左右。
目的：提高牙根中部以下根折恒前牙复位后牙髓的存活率和死髓后根管治疗术的质量。
AIM: to raise the living rate of pulp after review of the permanent-front-teeth with root-fractured beneath the middle and improve the quality of root-tube-treatment to the dead pulp teeth.
折流式反应器采用“人工接种活性污泥”的挂膜启动方式所需时间较短，大约经过12天左右的时间即可挂膜成功，COD和氨氮去除率分别稳定在72%、60%左右。
It take about 12 days to succeed in cultivating bio-film using of the method of artificial inoculation with activated sludge, and the removal ratio of COD, NH3-N, gets to 72% and 60%.
炭滑板经浸渍金属后，致密性、抗折强度、抗压强度、肖氏硬度明显提高，而开口气孔和电阻率降低。
The compactness bending strength, compressive strength, shore-hardness of carbon slides impregnated with metals were increased;
炭滑板经浸渍金属后，致密性、抗折强度、抗压强度、肖氏硬度明显提高，而开口气孔和电阻率降低。
The compactness bending strength, compressive strength, shore-hardness of carbon slides impregnated with metals were increased;
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