东亚金融危机后的缅甸华侨华人

东亚金融危机后,缅甸经济明显有恶化的趋势,政治仍然不稳定,“民主化”政治近期内难以出现,但中缅关系继续保持着友好发展的势头。缅甸华侨华人在危机后仍然以经济发展为主,政治地位有所提高,文化状况有所改善,但较长时期内仍将无法取得与缅族同等的政治地位。缅甸华族形成进程受若干因素制约,将是一个充满变数的长期过程

从制度变革角度看近代英国的崛起

近代英国政治领域的一系列制度变革促进了经济制度的变革,经济制度的变革又促进了技术变革和经济增长。因此,近代英国崛起的动力之一毋庸置疑是其各领域的制度变革。但是,制度变革是一个复杂的过程,只有恰当、适宜、一定质量和规模的制度变革才能最终导致一个大国的崛起。同时,我们也不能认同绝对的“制度决定论”

Research on anti-monopoly problemin the merger and acquisition in foreign

近年来，经济全球化的发展促进了跨国投资模式的日益创新。二十世纪九十年代以来，作为股权投资的新模式，并购成为了国际直接投资最主要方式，全球范围内不断掀起了跨国并购浪潮。在我国引进外资的过程中，也出现了外国投资者以并购我国公司、企业的方式进行的跨国直接投资。对于这类行为，国内学者一般称之为外资并购。对外资并购行为进行法律控制，尤其是反垄断控制是各国的普遍模式。我国在外资并购发展过程中，也不断出现外资垄断国内市场的现象。本文拟从外资并购和外资并购控制法的法律涵义、性质、特征展开分析，考察西方外资并购控制立法例，并针对我国外资并购立法现状，提出如何健全和完善我国外资并购反垄断控制法律的构想。文章除引言...With the globalization of economic development recently, new type of foreign investment comes forth constantly. Since 1990s in the 20 Century, as a new type of equity investment, Merger and Acquisition becomes the main model of international direct investment. International tide of Merger and Acquisition well up continuously. Foreign investors also engage the Merger and Acquisition in China, which...学位：法律硕士院系专业：法学院法律系_法律硕士(JM)学号：X19990801

Experimental study of the sea floor damage due to gas escape in hydrate dissociation

海床下水合物分解可能造成大量的生成气体泄漏.气体渗漏一方面造成海床表层的破坏;另一方面使得海水密度减小造成海上一些结构的安全隐患.本文通过实验研究泄漏气体在水中上升过程中的扩散行为,以及渗漏对海底粉砂土海床的破坏规律.考虑压力,盖层厚度在渗漏气体对盖层土体形态破坏的影响,获得了气体在水中上升过程中的扩散角的特点,以及气体泄漏导致的海床冲刷坑范围随气体压力、土层厚度的变化规律,可以为进一步的研究和工程应用提供参考. 更多还

Stitching Measurement Technique for Large-aperture Aspheric Surface during Grinding Process

为实现对磨削加工阶段大口径非球面光学元件的精密测量,提出一种基于坐标测量的多段拼接综合优化数据处理模型。基于多体系统理论、最小二乘原理建立两段面形轮廓拼接数学模型;提出基于曲率原理和非球面方程最小二乘拟合的冗余数据剔除数学模型;建立多段拼接的综合优化处理模型;利用TAylOr HObSOn轮廓仪对口径为176 MM的非轴对称非球面光学元件的3条母线进行分段测量试验并通过文中提出的数学模型进行数据拼接处理,试验结果表明,拼接测量结果与单次测量结果相比,误差最大值的平均值为0.25μM,最小值的平均值为–0.22μM,比该光学元件的面形峰-谷值2.77μM高出一个数量级,达到检测要求。试验结果证明所提多段拼接综合优化数据处理模型的正确性及有效性,该模型可以进行工程应用。In order to test large-aperture aspheric surface optice element accurately during grinding process, a comprehensive optimization data processing model of stitching measurement is proposed based on coordinate measuring.Firstly, the stitching model for two segments of surface shape contour is built based on multi-body system theory and least square principle; secondly, the rejecting redundant data model is built based on curvature principle and least square fitting of aspheric equation; then the comprehensive optimization processing model for multiple segments stitching is built; three generatrices of a non-axisymmetry aspherical optical element whose aperture is 176 mm is stitching measured by Taylor Hobson profilometer and the data is processed by the model mentioned in the text.The results show that the maximum average error of the stitching measurement is 0.25 μm, and the minimum average error of the stitching measurement is –0.22 μm which is compared with the single measurement.The error is an order of magnitude higher than the surface shape peak–valley value 2.77 μm of the optic element, and matches the measurement requirements.The experimental results prove the correctness and effectiveness of the comprehensive optimization data processing model of stitching measurement, and the model can be applied in engineering.国家自然科学基金资助项目(51075343;51275433

商誉与企业风险承担

商誉泡沫已成为资本市场健康发展的重要隐患,然而关于商誉与企业风险承担之间的关系却较少受到经验文献的关注。本文以中国资本市场2007-2014年间发生商誉事项的A股上市公司为研究样本,分析商誉影响企业风险承担的内在机理并加以实证检验。结果显示,商誉已成为企业承担较高水平风险的重要信号,公司拥有的商誉资产越多,其承担的风险水平相应越高。进一步的考察发现,伴随减值准备计提比例和企业成长性的提升,商誉对企业风险承担的影响显著增强。本文不仅丰富了商誉的经济后果文献,而且可为准则制定机构修订和完善企业会计准则、优化投资者投资决策提供理论参考。国家自然科学基金项目(71772001)全国会计领军(后备)人才项

有机光波导放大器最新进展

稀土掺杂平面光波导放大器是一类重要的光子学元件,它是光通信密集波分复用(DWDM)传输系统的重要组成部分,可以和调制器、光开关、隔离器、阵列波导光栅等任何有损耗的器件集成在一起,补偿光传输过程中的各类损耗。综述了应用于第二(1.33μm)、第三(1.53μm)标准通信窗口的有机光波导放大器的研究现状,阐述了不同类型材料制备的器件存在的优缺点、制备过程中存在的问题,并对其发展前景进行了展望

Movement Modeling and Control of Precession Mechanism for Bonnet Tool Polishing Large Aixsymmetrical Aspheric Lenses

研究大口径轴对称非球面气囊抛光进动运动建模及控制。分析气囊抛光机构及大口径轴对称非球面抛光进动工艺特点,确定以气囊自转轴线与气囊交点为研究对象,以气囊球心为原点建立气囊进动基础坐标系,根据大口径轴对称非球面连续进动抛光中各抛光点气囊自转轴与局部法线夹角值(即进动角)不变的原理,在分析每个抛光点时建立与其对应的坐标系,得到抛光该点时气囊自转轴与气囊交点在该点对应坐标系中的值,而后进行坐标变换,将抛光任意点时气囊自转轴线与气囊交点的位置换算至气囊进动基础坐标系中;根据大口径轴对称非球面方程、加工控制模型及前述的坐标变换运算结果,利用矩阵变换得到大口径轴对称非球面抛光的进动运动模型;在上述的运动模型中加入最有效率控制算法后进行运动学仿真,得到大口径轴对称非球面抛光的进动运动曲线,并通过仿真气囊自转轴线跟随加工点法线变化的趋势及比较仿真进动角与实际进动角验证所建立运动模型及控制算法的正确性。Movement modeling and control for bonnet tool polishing large axisymmetrical aspheric lenses is present.The intersection point of the spin axis and the bonnet is selected to be object,after analyzing the structure of bonnet tool and process feature of large axisymmetrical aspheric lenses polishing;a base coordinate is set up with the centre of bonnet to be its origin point.As the included angle of the spin axis of bonnet tool and the local normal is fixed in continuous precession polishing,a corresponding coordinate is set up to get the position parameters of the intersection point of the spin axis and the bonnet when polishing a random point,the position parameters of the intersection point of the spin axis and the bonnet in base coordinate are got according to space coordinate conversion;Movement model is obtained by space matrix transformation,based on the surface equation of large axisymmetrix aspheric lenses,processing control model and the position parameters got in last step;Finally,most efficiency algorithm is added to the movement model,and precession motion curve is got by simulation.The correctness of movement model and control algorithm is confirmed through simulating the trend of spin axis of bonnet follows the local normal and comparing the simulated value of precession angle with the actual value of precession angle.国家自然科学基金(51075343);厦门市科技计划(3502Z20113007)资

Truing Error Analysis of Arc Wheel in Optical Aspheric Grinding

针对光学非球面磨削加工中对圆弧砂轮修整精度要求比较高的特点,采用gC杯形砂轮修整器对圆弧砂轮进行修整,并分析杯形砂轮修整器几何误差和原理误差。在此基础上,讨论了各种误差对圆弧砂轮的修整及对非球面加工的影响程度,确定修整器定位倾斜误差是影响圆弧砂轮修整的主要因素,特别是对圆弧半径的影响。针对定位倾斜误差因素进行了砂轮修整实验,结果表明定位倾斜情况下拟合的圆弧半径残差较大且残差分布与理论分析一致。非球面加工实验显示定位倾斜情况下的工件面形误差分布情况与理论分析一致。修整器调正后再次进行加工,结果呈现不同的面形误差分布且误差减小了,验证了定位倾斜误差对非球面加工的影响。Aimed at high accurate truing of arc wheel in optical aspheric grinding,a GC cup truer was adopted for the arc wheel truing,and the truer's geometric error and principle error were analyzed.The effects of all errors on the arc wheel truing and optical aspheric grinding were discussed.It was found that the positioning tilt error was the main error in the arc wheel truing.Truing experiment results show that the residual error of fitting radius is bigger and its distribution coincides with theoretical analysis.The optical work-piece surface error distribution is also similar to theoretical analysis in the aspheric grinding.After anti-tilting,the experiment results show that the surface error distribution is changed and the surface accuracy is improved.国家自然科学基金项目(51075343); 国家科技重大基金专项(2011ZX04004-061