Investigation on the Orientation Transition of Oriented Magnetostrictive TbDyFe Crystals

<110> and <112> TbDyFe magnetostrictive oriented crystals were prepared by the zone-melting unidirectional solidification method at 240 mm/h and 720 mm/h respectively. <112> oriented crystals were also obtained with <110> oriented seeds with the same technique as for growing the <112> oriented crystals. It is confirmed that this technique is stable for growing the oriented crystals in the TbDyFe alloys. Meanwhile, the variation of orientation, the solidification morphology and the magnetostriction were studied during the transition from <110> oriented seeds to the <112> oriented crystal growth. As the growth speeds up, the preferred orientation changed from <110> to <112>, and its morphology develops from of initial cellular to dendritic gradually. When an axial compressive pre-stress of 10 MPa is applied, the magnetostriction at the bottom, the middle and the top are 972×10-6, 918×10-6 and 900×10-6 at 100 mT respec-tively. The middle sections with mixed orientations have the same high magnetostriction performance as those with a single preferred orientation, which may be due to its celluar-dendritic morphology.     

基于最大熵原理与 MonteCarlo法的隧道衬砌结构可靠度计算

针对隧道衬砌结构参数统计特征难以推断的特点,运用信息熵概念和最大熵原理对隧道衬砌结构随机参数进行估计,得到了更加科学的参数估计值.同时,将该估计值用于 MATLAB环境下 MonteCarlo模拟法计算隧道衬砌结构可靠度,得到相应的破坏概率和可靠度,并对隧道衬砌结构安全稳定性进行了评价.研究结果表明:用最大熵原理所推断的隧道衬砌结构参数分布更加科学可靠,且在 MATLAB环境下进行 MonteCarlo模拟法计算隧道衬砌结构可靠度,其计算速度快,精度高,可供类似的结构参数估计和可靠度计算参考.     

高等学校非法律专业《经济法》课程内容设置的探讨

高校非法律专业《经济法》课程的教学要求和目的等方面差异并不大，但目前的课程内容由于各种原因存在较大差别，文章主要通过对当前该门课程内容设置方面存在的差异分析，探讨进行课程内容设置的想法。     

基于量纲分析法对强夯加固深度的研究

影响强夯加固范围的主要因素有夯击能、夯锤面积、夯击次数、土体性质等,在分析这些影响因素的基础上,采取量纲分析的方法,建立了路基强夯加固的深度方程,并考虑土体的级配与含水量修正系数,建立了强夯加固深度的计算公式.最后和工程测试的有效加固深度进行对比,表明该公式与实际测试结果较为符合,证明该公式的有效性和可信性.     

经济法概念探析

该文通过对经济法的产生及发展、经济法价值和作用、经济法与市场经济存在的内在联系等方面的分析，对经济法概念提出了新的表述。     

渐变结构系统模糊可靠性灵敏度分析的矩方法(英文)

For a degradable structural system with fuzzy failure region, a moment method based on fuzzy reliability sensitivity algorithm is presented. According to the value assignment of performance function, the integral region for calculating the fuzzy failure probability is first split into a series of subregions in which the membership function values of the performance function within the fuzzy failure region can be approximated by a set of constants. The fuzzy failure probability is then transformed into a sum of products of the random failure probabilities and the approximate constants of the membership function in the subregions. Furthermore, the fuzzy reliability sensitivity analysis is transformed into a series of random reliability sensitivity analysis, and the random reliability sensitivity can be obtained by the constructed moment method. The primary advantages of the presented method include higher efficiency for implicit performance function with low and medium dimensionality and wide applicability to multiple failure modes and nonnormal basic random variables. The limitation is that the required computation effort grows exponentially with the increase of dimensionality of the basic random vari- able; hence, it is not suitable for high dimensionality problem. Compared with the available methods, the presented one is pretty competitive in the case that the dimensionality is lower than 10. The presented examples are used to verify the advantages and indicate the limitations.     

高校教师创新能力的基本要求

论文认为,高等教育在完成创新型人才培养使命的过程中,教师是关键因素.因此,高校必须全方位的注重教师的素质提高,尤以培养创新能力为先.所以,对高校教师创新能力应该有一些基本的要求,这些要求可以归纳为以下几个方面:(1)知识结构上应该专博兼顾;(2)内心修炼上必须强化社会责任感;(3)个人特质上应具有强烈的研究性学习要求和...     

略论电子商务国内税收问题

近些年来,是否对我国的电子商务征税问题引起了热议.论文介绍了电子商务征税问题的讨论情况,认为虽然我国的电子商务发展速度很快,但相对而言,作为一种新型的市场模式,其发展仍处于起步阶段.在这个阶段,应该探讨如何促进这个产业的快速、良性发展,而不是出台一项政策而使之受到打击.     

当代网络思想政治教育面临的矛盾

随着网络传播技术与信息技术的高速发展,网络给人们的生活带来了巨大的变化,丰富的网络资源在给人们带来正面影响的同时,也给人们带来了许多的负面影响.思想政治教育工作者可以利用计算机网络,依据传播学与思想宣传的理论与方法对人们进行思想政治教育,但在进行网络思想政治教育过程中,矛盾普遍存在于教育的整个过程中,如虚拟与现实,主导与自主,一元与多元,规范与自由,他律与自律等矛盾始终贯穿于整个教育之中,这些矛盾的存在与发展为当代网络思想政治教育工作提出了挑战.论文认为,思想政治教育工作者面对网络媒体的现实挑战,应该建立一套科学有效的应对方法.     

桂林大学前瞻

21世纪的脚步声已清晰可闻了，知识经济作为世界经济主角初露端倪。高等教育是知识经济社会教育体系中的核心部分，它如何面对新世纪的挑战，尤为高等教育界所瞩目。文章对广西高等教育赍源中的桂林高等学校现状和未来，作了一个大胆的设想与分析，旨在引起有关部门和同行的共鸣。全文分为五个部分阐述：(1)桂林高等教育资源现状一瞥；(2)设立桂林大学的必要性和意义；(3)设立桂林大学的优势；(4)对桂林大学设立中的若干问题的建议；(5)对桂林大学的憧憬。