光纤弯曲损耗特性的理论与实验研究

为了减小在长距离光纤通信中存在的弯曲损耗和利用光纤激光器中的弯曲损耗获得单模输出，利用速度法解释了光纤弯曲损耗机制，采用Marcuse理论研究了弯曲损耗随弯曲半径、波长和纤芯半径变化的关系。通过计算机仿真和实验得出弯曲损耗随弯曲半径的减小而增大，随波长的增大而增大，随纤芯半径的增大而增大，高阶模式的损耗大于低阶模式。利用这一结论就可以通过控制弯曲半径在临界半径以内来减小通信中的弯曲损耗，通过增大模场半径来实现光纤激光器中的单模输出。     

食品中多巴胺测定方法研究

研究了多巴胺与四氯苯醌间的荷移反应条件，测得络合物组成比为１：１，摩尔吸光系数ε＝１．６３×１０￣３。方法的相对标准偏差为１．２％（ｎ＝１０）。在６ｏ℃保温１ｈ形成粉红色络合物，λ＿（ｍａｘ）＝４８０ｎｍ，应用拟定的方法测定食品中多巴胺含量，回收率在９０％以上。     

国际HPM的发展历程及启示

目的探讨国际HPM的发展及启示。方法科学史文献研究。结果介绍了国际HPM兴起的原因；着重介绍了HPM最近20多年的发展，包括HPM团队的发展、HPM学术会议的举办情况、HPM活动期间出版的各类刊物、HPM的前任主席等方面的情况。同时，介绍了世界上不同国家和地区HPM的活动情况。结论国际HPM的发展对于中国数学教育改革具有借鉴意义。     

基于存储的矩阵乘积优化算法

提出了一种基于存储的矩阵乘积优化算法.该算法转置矩阵,提高cache命中率,从而降低矩阵乘积时间. 实验结果表明此算法是行之有效的.     

利用GIS分析辽宁省岫岩地区泥石流沟谷活动

阐述了泥石流的危害、形成和发生的条件.应用地理系统、趋势分析模型及熵变理论,分析了辽宁省岫岩地 区泥石流沟谷活动的稳定性.     

Composition of sandstone and heavy minerals implies the provenance of Kuqa Depression in Jurassic, Tarim basin, China

The petrological characteristics and heavy mineral assembly of the Jurassic System in Kuqa Basin are consistent with the tectonic evolution, which is the major factor controlling the filling process of Kuqa Basin. Controlled by the source areas at the both sides of the Basin, the matrixes are dominated by sedimentary rock, high-grade metamorphic rock, acid magmatic rock, and the highest heavy mineral assemblage of zircon-garnet-magnetite in the content. According to heavy mineral indexes, the Jurassic strata can be classified into three rhythmic units of heavy mineral. The lower sequence contains abundant heavy minerals and relatively high content of detritus and its matrixes primarily came form the recycling orogen. The assemblage of “zircon-garnet-magnetite” indicates that the sedimentary area in the early evolution period of the basin is relatively near the provenance. The middle sequence is different from the lower sequence in the heavy mineral assemblage and has the different characteristics from that of source rock. The heavy mineral assemblage is “garnet-zircon” with the highest content of garnet and its main matrices are the high-grade metamorphic rock, acid magmatic rock and hydrothermal vein at the northeastern edge of the basin. The middle and upper sequences are characterized by the clast provenance, which is primarily from the recycling orogen at the northern edge of the basin and secondarily from the southern uplift. As a result of the two provenances, the strata with apparent changes of heavy mineral assemblage and index better coincides with the interfaces of the secondary strata sequences, which reflects the denudation history and the filling process of the orogen at the northern edge of the basin.     

Prediction of shear stress-related hemolysis in centrifugal blood pumps by computational fluid dynamics

A quantitative evaluation of shear stress-related hemolysis in centrifugal blood pumps with different impeller designs has been investigated. Computational fluid dynamics (CFD) is applied to track the shear stress history of the streamlines of red cells. The power law model of the relations among the hemolysis, shear stress and exposure time is used to evaluate the hemolysis in the pumps. Hemolysis tests are also conducted to verify the estimations. Both the estimations and experimentally measured hemolysis levels show that the hemolysis in the streamlined impeller pump developed by the authors is lower than the pump with straight-vane under the same boundary conditions. The approach is proved to be acceptable and practical to predict hemolysis levels of blood pumps.     

基于最大似然准则的f-x-y域l1模预测滤波方法

常规的f-x-y域预测滤波方法基本上都假设随机噪音是服从高斯分布的,但在实际地震资料中并不是所有的随机噪音都服从于高斯分布。针对非高斯分布的随机噪音,讨论了f-x-y域l1模预测滤波方法。该方法利用最大似然准则建立目标函数,同时利用非线性共轭梯度法来优化求解目标函数。理论模型试算表明,f-x-y域l1模预测滤波方法不仅可以有效地消除非高斯分布的随机噪音,而且也避免了假同相轴现象的产生。     

从我国国情看图书馆的现状及其发展趋势

在分析我国国情和图书馆现状的基础上,论述了在21世纪,图书馆领域将是以传统图书馆为主导,部分复合图书馆和少量数字图书馆并存的发展趋势,而随着社会的进步和发展,复合图书馆将逐渐成为未来图书馆的主要形态.     

“汇编语言程序设计”课程的教学改革与探讨

在分析了“汇编语言程序设计”课程教学现状的基础上,提出了以Win32汇编语言程序设计为教学内容对课程进行改革,并阐述了改革的意义。针对该课程的培养目标,详细介绍了课程的内容、教授的难点及解决办法,并总结了教学改革与实践的经验。