The Perturbation Parameter in the Problem of Large Deflection of Clamped Circular Plates

In the problems of large deflection of clamped circular plates under uniformly distributed loads,various perturbation parameters relating to load,deflection,slope of deflection,membrane force,etc.are studied.For a general perturbation parameter,the variational principle is used for the solution of such a problem.The applicable range of these perturbation parameters are studied in detail.In the case of uniformly loaded plate,perturbation parameter relating to central deflection seems to be the best among all others.The method of determination of perturbation solution by means of variational principle can be used to treat a variety of problems,including the large deflection problems under combine loads.     

The perturbation parameter in the problem of large deflection of clamped circular plates

In the problems of large deflection of clamped circular plates under uniformly distributed loads, various perturbation parameters relating to load, deflection, slope of deflection, membrane force, etc, are studied. For a general perturbation parameter, the variational principle is used for the solution of such a problem. The applicable range of these perturbation parameters are studied in detail. In the case of uniformly loaded plate, perturbation parameter relating to central deflection seems to be the best among all others. The method of determination of perturbation solution by means of variational principle can be used to treat a variety of problems, including the large deflection problems under combine loads. This paper is completed under the guidance of Prof. Chien Wei-zang.     

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介绍了离子回旋波加热中天线的研究进展,讨论了传统环天线、相控双环天线及双臂单环天线激发波的频谱特征。使用射线轨迹方法对单通吸收率进行了数值计算,得到环向谱与单通吸收率的关系。由此验证了双臂单环天线有较好的耦合性能。该天线结构简单,能够改善加热性能。     

晶格中心插入体的对称性及取向对二维声子晶体带隙的影响

以二维钢/气体系声子晶体为模型,采用平面波法研究了圆柱正方及六角晶格中心添加插入体的对称性及取向与带隙的关系,给出了四方、六方、八方及圆柱插入体结构的带隙分布图及带隙随柱体取向的变化关系图.发现在低填充率条件下,插入体的截面形状与晶格类型相同时最有利于能带简并态的分离而获得带隙,但填充率较高时,采用高对称性的插入体可以获得最宽的带隙.正方晶格中心插入体取向对带隙的影响要比在六角晶格中更为显著.对四方柱正方晶格声子晶体的研究表明,仅旋转原柱体要比在其中心插入柱体后旋转更容易获得低频宽带隙,单独运用添加柱体或旋转非圆柱体来降低晶格对称性以获取低频带隙的方法要比同时使用两种方法效果更好.此外,从机理上对计算结果进行了解释.     

Spin Squeezing and Entanglement of Many-Particle Spin-Half States

In many-particle spin-half systems with exchange symmetry, we find that the spin squeezing is related to two types of entanglement, the bipartite and the pairwise entanglement. A quantitative relationship is revealed for the spin squeezing parameter, the tangle, and the concurrence. We find that a class of states is spin squeezed if the pairwise entanglement is stronger than the bipartite entanglement.     

High Power One- and Two-Order Cascaded Raman Lasers Based on Home-Made Phosphosilicate Fibre

One- and two-order cascaded Raman fibre lasers are demonstrated by using home-made P-doped Raman fibres.An output power of 2.8 W at 1245 nm with a slope efficiency of 33.4% and an output power of 2.0 W at 1495 nm with a slope efficiency of 23.5% are obtained with the pump source at 1069. 7nm.     

快波少数离子加热

对快波少数离子加热的机理进行了比较详细的讨论.通过射线轨迹算法对两种离子的等离子体快波加热进行了数值模拟,并给出了两种离子不同浓度比的计算结果.     

<光谱实验室>投稿须知(2000)

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