伪压缩型映象迭代逼近的收敛性问题

研究一类伪压缩型映象迭代逼近的收敛性问题，其结果改进和推广了已有结果．     

Design study for the cascaded HGHG experiment based on the SDUV-FEL

Cascading stages of high-gain harmonic generation(HGHG) free electron laser(FEL) is a promising way to produce fully coherent X-ray radiation.As a test facility for modern FEL R&D,the Shanghai deep ultraviolet FEL(SDUV-FEL) is now under upgrading for the cascading two stages of HGHG experiment.Since the energy of the electron beam is as low as about 185 MeV after upgrade,the total harmonic number of this two stages HGHG is only 2×2,and the wavelength of the final radiation is 196.5 nm which is the 4th harmonic of the 786 nm seed laser.With help of three-dimensional simulation codes,design studies on the FEL physics for the cascaded HGHG experiment are present based on the parameters of the upgraded SDUV-FEL facility.It is found from the simulation results that the part of the electron beam which has been used in the first stage can still generate powerful radiation in the radiator of the second stage,and this radiation will be difficult to be separated from the radiation generated by the fresh part of the electron beam.To overcome this problem,a novel method based on the energy spectrum of the electron beam is proposed in this paper to demonstrate the "fresh bunch" technique.     

论网络科技型中小企业人力资源管理的问题与对策——以安徽某网络科技公司为例

以安徽某信息科技有限公司人力资源管理为研究对象,首先对人力资源和人力资源管理的涵义和特点进行阐述说明,然后简要阐述该公司当前实际,明确该公司当前人力资源管理中所存在的问题,再结合公司的发展目标和发展要求等,深入分析该公司当前人力资源管理的目标任务,最后重点论述该公司人力资源管理的对策,从而做到应对与解决问题。     

笼头菌科新属和新种

发现了四川省攀枝花市的属于鬼笔目Ｐｈａｌｌａｌｅｓ，笼头菌科Ｃｌａｔｈｒａｃｅａｅ的新属：内笼头菌属Ｅｎｄｏｃｌａｔｈｒｕｓ，新种：攀枝花内笼头菌Ｅｎｄｏｃｌａｔｈｒｕｓ ｐａｎｚｈｉｈｕａｅｎｓｉｓ予以报道。     

从大学生身体素质状况谈高校体育改革

从大学生身体素质状况分析入手,探讨了大学生身体素质下降的原因,并提出改革高校体育的一些设想.     

NECESSARY AND SUFFICIENT CONDITION FOR GLOBAL CONTROLLABILITY OF A CLASS OF AFFINE NONLINEAR SYSTEMS

In this paper, we investigate the global controllability of a class of n-dimensional affine nonlinear systems with n- 1 controls and constant control matrix. A necessary and sufficient condition for its global controllability has been obtained by using the methods recently developed. Furthermore, we generalize the above result to a class of affine nonlinear systems with a block-triangular-like structure. Finally, we will give three examples to show the applications of our results.     

重视学生辩证逻辑思维的培养

系统的论述了培养学生辩证逻辑思维的重要性。     

保险公司破产概率的估计及随机模拟

研究人寿保险的破产模型 ,其中保单到达和索赔发生时刻为相互独立的 Poisson流 ,索赔额服从指数分布 .针对此模型给出了 t时刻之前破产概率的一个上界估计 ,并给出了破产概率的随机模拟计算流程和一个具体例子的数值模拟结果.     

双代号网络图中虚工序对时差计算公式的影响与修正

如何使用最少的虚工序和虚节点绘制双代号网络图属于NP-hard问题,所以对于任意一个给定的项目,会存在多个正确的而且虚工序画法不同的双节点网络图与之对应.本文的目的在于研究双代号网络图中不同虚工序对时差计算公式的影响并进行修正.虚工序画法的不同会导致网络图中产生数量和类型不同的节点,因此研究方法从分析节点入手.首先根据虚工序的画法将节点分为一般节点,虚出节点和虚进节点三类,然后逐一分析每类节点对工序时间参数节点式计算公式的影响.通过同定义式算法对比,结果发现工序自由时差和安全时差的节点式算法分别对于虚出节点和虚进节点失效.最后提出节点式计算公式的修正方法,实例分析证明本算法简捷有效.     

异自旋中心有机铁磁体分子设计

采用量子化学从头算ＵＨＦ方法对系列异自旋三自由基体系的基态自旋耦合规律进行研究，并对组成不同的异自旋（ｈｉｅｔｅｒｏ ｓｐｉｎ）三自由基进行了系统的比较，为新型有机磁性材料的实验合成提供了理论依据。