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This paper described the principle of plane ultrasonic spreading abroad in the liquid coming into being ultrasonic grating,educed the density and refractive index changing rule basis continuity equation of not-ideal liquid and Lorentz-Lorenz law,expressing the transformation of the index and refractive index satisfaction similar equation of standing wave,and described the relation curve of the standing wave form at a few special times,liquid density and refractive index periodic variety according to the res...

描述了平面超声波在液体里传播形成超声光栅的原理；根据非理想流体对应的连续性方程和Lorentz-Lorenz定律，推导了液体光栅中液体密度与折射率的周期性变化规律，表明液体密度和折射率变化满足相似的驻波方程；根据推导的结果描绘了几个特殊时刻的驻波波形、液体密度、折射率周期性变化之间的关系曲线；进而由折射率周期性变化规律分析了超声驻波自身像的形成原理，并给出了CGS型超声光栅声速仪利用超声驻波自身像测量声速的方法与实验结果。

The results reveal that under the conditions of the third-class sites in the Southern Fujian mountain areas,the suitable planting density is 1250～1798 trees/hm 2 for building eucalyptus short-cycle industrial raw material forests; and adopting the present density to conduct afforestation may culture the best-selling dimension lumber with higher growth and may obtain better economic benefits.

通过对 7年生巨尾桉不同造林密度生长量、生物量分析，结合目标培育径阶所确定的理论适宜株数的研究，结果表明，在闽南山地Ⅲ级立地条件下，营造桉树短周期工业原料林适宜造林密度为 1 2 5 0～ 1 798株·hm-2 ，采用该密度造林不但可以培育市场畅销的规格材且生长量较高，可取得较好的经济效益

The leakage current of poly-Si TFTs is owing to the high drain electric field and large trap state density at drain junction. In this thesis, we found the silicon nitride film as the diffusion barrier prevents the hydrogen atoms downward diffusion and accumulated at the channel to further reduce the trap state density.

对於复晶矽薄膜电晶体其漏电主要与缺陷密度和集极电场强度有关，在本篇论文中我们发现氮化矽绝缘层能够有效的阻挡氢原子向下扩散而累积在通道之中，更进一步的去修补通道中的缺陷。

Taking Zhengdan958 as material,six density levels were designed to investigate the effects of different planting density on physiological decline on ear leaf of summer maize.

以郑单958为供试品种，在大田条件下研究不同种植密度对夏玉米果穗叶生理功能衰退特性的影响。

In these factors, reducing population density (especially city population density), improving earthquake-proof capability of buildings and enhancing forecasting accuracy, which could he affected by human activities, are more important for reducing the casualties in earthquakes.

作为人为可控预测指标，减少人口密度特别是城市人口密度，提高建筑物抗震能力及预测预报水准，对於减少地震灾害人员伤亡起更重要的作用。

The anodes have improved assembly density, high capacity and high energy density.

该负极具有改善的装配密度、高容量和高能量密度。

Do the frequencies at which resonance occurs depend on the linear density of the wire Do the shapes of the resonance patterns (locations of nodes and antinodes) depend on the linear density of the wire

共振频率是否依赖于金属丝的线密度共振模式的形状是否依赖于金属丝的线密度

Do the frequencies at which resonance occurs depend on the linear density of the wire Do the shapes of the resonance patterns (locations of nodes and antinodes) depend on the linear density of the wire

通过换线来改变其线密度。共振频率是否依赖于金属丝的线密度？共振模式的形状是否依赖于金属丝的线密度？

Keeping baryon density invariant, the fractions of hyperons at S = 2 are largerthan those at S = 1 in the region of relative low density of baryons.

给定重子密度，中子在S=2时的组分比S=1时的小，而质子、电子、μ子在S=2时的组分比S=1时的大，特别是在低密度区域。S是每个重子的熵。

Herbs bourgeoned with a high density and a low coverage in early july . with the coming of rain season , the velocity of growth in herbs enhanced with the higher coverage in august . in september , the growth of herbs stopped and the density and coverage of herbs descended

草本植物在7月初萌发，平均密度大，但植株较小，盖度也小；随着降雨量的增加，在8月份一一草本植物的快速生长期，草本植株个体长大，平均盖度达最大值，但是密度却有所下降；到了9月中下旬基本成熟并逐渐死亡，盖度和密度均下降。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。