Representation of the Inferior Limit as the Supremum of Lundberg Exponent

给出并证明伦德伯格指数的上确界的下极限表示．We give and show that representation of the inferior limit as the supremum of Lundberg exponent.2016年度伊犁师范学院研究生科研创新项目“伦德伯格指数的若干讨论”（2016YSY014）

卷积等价分布簇的推广及其分布卷积根的封闭性

在文献[1]的基础上,研究推广的卷积等价分布的卷积根的封闭性.2016年度伊犁师范学院研究生科研创新项目“伦德伯格指数的若干讨论”(2016YSY014

Transition Metal Promoted ZSM-5 Catalysts for the Conversion of Dimethyl Sulfide into Methanethiol

负载过渡金属的zSM-5催化剂用于催化甲硫醚(dMS)转化成甲硫醇(MT)的反应.实验结果表明,催化剂的甲硫醚转化率提高和甲硫醇选择性降低的趋势一样,都是以下顺序:CO/zSM-5>MO/zSM-5>nI/zSM-5>W/zSM-5.表征结果表明,由于过渡金属阳离子(W6+、nI2+、CO3+、MO6+)比Al3+活泼,而改性过程中W6+、nI2+、CO3+、MO6+分别代替了部分Al3+,使得改性催化剂对dMS和MT的化学吸附作用更强.过渡金属的引入使得zSM-5总酸度增强,提高了C―S键的裂解能力,从而改进了催化转化dMS的能力.研究结果发现,在转化dMS的过程中,金属活性位和酸性位之间通过强的协同效应起作用.ZSM-5-supported transition metal catalysts were prepared and used to catalyze the conversion of dimethyl sulfide(DMS) into methanethiol(MT).Test results indicated that the activities of the catalysts for the conversion of DMS increased as follows: Co/ZSM-5>Mo/ZSM-5>Ni/ZSM-5>W/ZSM-5.The decrease in MT selectivity followed the same trend.The characterization results showed that transition metal cations(W6 +, Ni2 +, Co3 +, Mo6 +) replaced some Al3 +sites leading to more active in chemiadsorption of DMS and MT since transition metal cations are more active than Al3 +.The incorporation of transition metals into ZSM-5enhances the total acidity of ZSM-5 and increases its capacity to rupture C―S bonds.This subsequently improves its catalytic behavior in the conversion of DMS.We found that the metal active sites and closely situated acidic sites have a strong synergistic effect when converting DMS

连续陶瓷纤维的制备、结构、性能和应用:研究现状及发展方向

连续陶瓷纤维是纤维增强陶瓷基复合材料的增强体,对提高陶瓷基复合材料的强度和韧性起关键作用,高损伤容限和高强度陶瓷纤维是阻止裂纹扩展实现陶瓷基复合材料强韧化的保障。本文对碳化硅、氮化硅、氮化硼、氧化铝和氧化锆等几种陶瓷纤维的制备方法、结构、性能和应用等方面进行了全面的综述,指出了今后的发展方向,期望为未来陶瓷纤维的研究、开发及应用提供参考。国家高技术研究发展计划(863)(2003AA305630);;国家自然科学基金(51472144);;山东省科技重大专项(2015ZDZX11003);;山东省青年学者未来计划(2016WLJH27

证券分析师的股票评级与内部人交易--我国证券分析师是否存在道德风险

证券分析师的独立性是近年来资本市场的研究热点。本文将“曾参与上市公司的IPO或身为上市公司大股东”的券商旗下分析师界定为上市公司的利益相关者，并收集有关样本数据探讨证券分析师是否存在道德风险。实证研究后发现：利益相关的分析师存在道德风险，其通过发布有利于利益相关公司的分析报告，使得内部人特别是高管在股份减持时获得更高的超额收益；同时，内部人减持的超额收益率在财务状况差的公司且市场态势好的情况下更高。基于此，本文建议，投资者要谨防利益相关的分析师为内部人减持做出的过度乐观评级；要完善制度，打击利益相关分析师与相关公司高管和大股东可能的串谋行为，加强分析师声誉机制建设

Securities Analysts' Rating on the Stock and Insider Trading:is There any Moral Hazard Among Securities Analysts?

证券分析师的独立性是近年来资本市场的研究热点。本文将“曾参与上市公司的IPO或身为上市公司大股东“的券商旗下分析师界定为上市公司的利益相关者,并收集有关样本数据探讨证券分析师是否存在道德风险。实证研究后发现:利益相关的分析师存在道德风险,其通过发布有利于利益相关公司的分析报告,使得内部人特别是高管在股份减持时获得更高的超额收益;同时,内部人减持的超额收益率在财务状况差的公司且市场态势好的情况下更高。基于此,本文建议,投资者要谨防利益相关的分析师为内部人减持做出的过度乐观评级;要完善制度,打击利益相关分析师与相关公司高管和大股东可能的串谋行为,加强分析师声誉机制建设。The securities analyst independence is a research hotspot of capital market in recent years.We define those security analysts,employed by brokerage firms or investment banks that participated in the firm's IPO or being one of the firm's large shareholders,to be benefit related with the listed firm,and collect relative data to analyze whether there is moral hazard.We find that there is moral hazard for the benefit related analysts,who make the internal people,especially executives higher excess returns by publishing favorable analysis reports.Under the same time,the excess returns were even bigger when the companies in a poor financial condition while the market was good.In order to avoid this abnormality,we should encourage reputation mechanism for the analysts,and expedite the development of legal system to prevent the conspiracy between analysts and insiders.Lastly,investors should be cautious about the over-optimistic analyst's ratings

利用压电驱动器改善飞机横滚性能的试验验证

Piezoelectric actuators are mounted on both sides of a rectangular wing model. Possibility of the improvement of aircraft rolling power is investigated. All experiment projects, including designing the wind tunnel model, checking the material constants, measuring the natural frequencies and checking the effects of actuators, guarantee the correctness and precision of the finite element model. The wind tunnel experiment results show that the calculations coincide with the experiments. The feasibility of fictitious control surface is validated