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Abstract: It is found through theoretical analysis that,heat-lens effect arises only when the light is birefracted in photorefractive crystals.It is also point out that the lateral anisotropic temperature gradient is only one cause causing the heat-lens e
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文摘:通过对光折变晶体的热透镜效应的理论分析发现，光通过光折变晶体时，只有在晶体发生双折射的前提下，才能发生热透镜效应.并指出，晶体内存在的由热效应引起的横向各向异性温度梯度仅是产生热透镜效应的一个方面，而“光阻”则是产生光折变晶体热透镜效应的另一个原因，从而丰富了光折变效应的内涵. |
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Abstract: It is inevitable that serious natural disaster and paroxysmal public crisis will occur in any country, thus exerting impact on the relevant industries.
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摘要：任何一个国家，发生重大的自然灾害和突发公共危机事件都不可避免，从而对有关产业产生重大影响和冲击也不可避免。 |
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Abstract: It is introduced that the current situation of agriculture and its problem in Equatorial Guinea.The way of agricultural production is still very old ,and the production level is very low.
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文摘:介绍了赤道几内亚近30年来农业的发展情况及农业生产现状并分析了限制赤道几内亚农业发展的主要问题。 |
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Abstract: It is necessary to control the mechanical stimuli precisely in the studies of cardiac mechano-electrical feedback(MEF).In the present study a ventricular pressure-clamping system has been developed,which can be applied to isolated-perfused rabbi
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文摘:在心脏机械电反馈的研究中准确控制机械刺激是非常重要的.本研究室构建了一套适用于离体家兔心脏的心室压力钳系统.该系统通过计算机控制压力钳,不仅能模拟正常生理条件下左心室的压力波形,还能在心室活动周期的特定时相、以适当波形对心室施加机械刺激.该系统集心脏灌流与起搏、表面心电图记录、单相动作电位记录、心室压力钳制与测定等多种功能于一体,特别适用于器官水平上观察机械电反馈现象并探讨其机制. |
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Abstract: It is observed that the Sommerfeld's formula for a progressive spherical wave is not covariant with respectro the rotation of the coordinate system.It contains complex partial waves that are not physical.The standing wave representation of the s
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文摘:说明了球面行波的索末菲公式在坐标转动下不协变.证明了球面波的驻波表示是协变的，因而是一个物理的关系式，故适用于圆柱坐标中各类波动方程的定解问题.作为一个例，应用于光纤光学，导出了受导简正模和辐射模的表达式，以及各模式的强度分布. |
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Abstract: It is proposed that the sturdiness of silicic acid congealed gel is a key factor to make the reaction of producing“Lead Trees” successful.The better conditions of preparing silicic acid congealed gel are detemined.The success rate of this oxidat
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文摘:提出了生成“铅树”反应成功的关键是硅酸凝胶的坚固性，找到了较好的硅酸凝胶的制备条件，使该氧化还原平衡移动的反应成功率提高了90％以上. |
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Abstract: It is proposed the opinions on the conditions of lectotype of light rail vehicles, applicability of high floor &low floor vehicles, car body materials, motor power as well as applying of resilient wheels and magnetic track brake etc.
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文摘:对我国轻轨车的选型条件、高地板车和低地板车在我国的适用范围、车体材料、电动机功率、弹性车轮和磁轨制动的采用等，作者提出了自己的看法。 |
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Abstract: It is proved that a small circular aperture has the positive and minus focal distances,and the research experiments for small aperture glasses are introduced concisely.
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文摘:提出了证明小圆孔具有正、负焦距的一种方法，简要地介绍了关于小孔眼镜的实验研究. |
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Abstract: It is shown in this paper that distributions of electric fields in five measuring slots of Uster Evenness Tester,and the errors caused by uneven electric fields were analysed.According to the results of measuring and analysing electric fields,a
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文摘:实测了乌斯特纱线均匀度试验仪上5个电容测量槽的电场强度分布,分析了由测量槽不均匀电场所引入的误差.系统地测试分析了第5号槽误差,获得了几种误差的定量估计.最后给出了正确使用仪器,避免测量误差所应注意的几点结论. |
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Abstract: It is studied that milling time,carbon content,inhibitor and sintering effect on properties of the submicron cemented carbides.
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文摘:研究了球磨时间、碳含量、抑制剂以及烧结对超细硬质合金性能的影响。 |
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Abstract: It is summarized and discussed detailedly the ways and features of quality control in producing mixture with wet millingspray drying process.
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文摘:对湿磨－喷雾干燥工艺混合料生产中的质量控制及其特点做了比较详细的介绍和讨论。 |
