Deep structure at northern margin of Tarim Basin

In this paper, a 2D velocity structure of the crust and the upper mantle of the northern margin of the Tarim Basin （TB） has been obtained by ray tracing and theoretical seismogram calculation under the condition of 2D lateral inhomogeneous medium using the data of seismic wide angle reflection/refraction profile from Baicheng to Da Qaidam crossing the Kuqa Depression （KD） and Tabei Uplift （TU）. And along the Baicheng to Da Qaidam profile, 4 of the 10 shot points are located in the northern margin of the TB. The results show that the character of the crust is uniform on the whole between the KD and TU, but the depth of the layers, thickness of the crust and the velocity obviously vary along the profile. Thereinto, the variation of the crust thickness mainly occurs in the middle and lower crust. The Moho has an uplifting trend near the Baicheng shot point in KD and Luntai shot point in TU, and the thickness of the crust reduces to 42 km and 47 km in these two areas, respectively. The transition zone between the KD and TU has a thickest crust, up to 52 km. In this transition zone, there are high velocity anoma- lies in the upper crust, and low velocity anomalies in the lower crust, these velocity anomalies zone is near vertical, and the sediment above them is thicker than the other areas. According to the velocity distributions, the profile can be divided into three sections： KD, TU and transition zone between them. Each section has a special velocity structural feature, the form of the crystalline basement and the relationship between the deep structure and the shallow one. The differences of velocity and tectonic between eastern and western profile in the northern margin of the Tarim Basin （NMTB） may suggest different speed and intensity of the subduction from the Tarim basin to the Tianshan orogenic belt （TOB）.     

基于时间分辨反射测量的混浊介质光学参数计算方法

发展了一种基于时间分辨反射测量技术的混浊介质光学参数重构方法．采用半无限空间扩散方程解析解卷积时间定标测量曲线获得模拟时间扩展曲线,将此与基于时间相关单光子计数技术实测的全时间分辨曲线进行归一化拟合;在对一个已知光学参数的定制模型验证的基础上,通过对4个参数未知的混浊介质进行测量,显示了方法的可行性和有效性．     

Recent development of peptide self-assembly

Amino acids are the building blocks to build peptides and proteins. Recent development in peptide synthesis has however enabled us to mimic this natural process by preparing various long and short peptides possessing different conformations and biological functions. The self-assembly of short designed peptides into molecular nanostructures is becoming a growing interest in nanobiotechnology. Self-assembled peptides exhibit several attractive features for applications in tissue regeneration, drug delivery, biological surface engineering as well as in food science, cosmetic industry and antibiotics. The aim of this review is to introduce the readers to a number of representative studies on peptide self-assembly.     

伪造、变造金融票证罪与票据诈骗罪的相关性与辩正性思考

从刑法对伪造、变造金融票证罪与票据诈骗罪的立法界定可以看出,两罪是有区别的。伪造、变造金融票证罪与票据诈骗罪的相关性思考主要是指对司法实践中两罪的交叉性进行的一种定位与思考。而辩正性思考则是指对两罪在交叉构成牵连犯的情况下如何进行处断的一种“回归性”正确的思辩。但无论是相关性思考还是辩正性思考,其目的都是为了让法律的实体性规范在应然性理念的指引之下真正回归到法律的应有性状态中去。     

新形势下构建高等农业院校经济困难学生资助体系的思考

社会经济发展的不平衡和生源的特殊性,导致了高等农业院校经济困难学生资助工作的相对复杂性和弱效性。在新的形势下,如何做好贫困生的资助工作,是实现教育公平、落实人本理念的重要方面,也是高校综合实力的重要体现。建立家庭经济困难学生评价体系、物质资助和精神资助三大体系,实现鉴别与资助两步走、物质与精神两手抓,将有助于提高资助的功能,提升资助的水平。     

中国企业网站可信度现状及建设探究

网站可信度是企业网站成功与否的重要标准。较低水平,加强企业网站可信度建设是企业亟待解决的问题。度评价的主要因素着手,来建立企业网站可信度。从实际情况来看,目前我国企业网站可信度水平整体上还处于本文从网站用户的角度出发,提出从影响用户对企业网站可信     

基于最优化方法的共反射面元叠加

共反射面元叠加可以直接由多次覆盖反射数据得到零炮检距剖面,不依赖于速度信息。通过对共反射面元叠加优化方法进行改进,大大提高了共反射面元叠加三参数分析的精度。同时引入模拟退火全局优化算法,有效地解决了新优化方法中遇到的组合优化的难题。基于CRS参数搜索的具体问题,对模拟退火算法中的三函数两准则做了最优设计。模型数据的试算和实际资料的处理结果验证了新优化方法的有效性和实用性。     

民族院校《高等代数》的教学思考

《高等代数》是数学专业的核心课程之一,针对现阶段民族院校《高等代数》课程教学存在的问题,结合长期的教学实践和民族学生的实际,提出了民族院校《高等代数》教学的几点建议。     

高速时钟线的反射特性分析

随着系统时钟频率的不断提升,时钟线的反射问题已成为高速电路时钟设计中必须考虑的问题之一.本文基于高速数据采集系统的差分时钟线,分析了各种端接方式对反射噪声的抑制能力.仿真及实测结果表明采用终端下拉方式,可使时钟线上的反射噪声控制在最佳5%信号幅值的系统容限设计要求以内,与其他端接方式相比更有效地抑制了本系统差分时钟线上的反射噪声,保证了时钟系统的信号完整性.     

多孔SiO_2减反射薄膜的制备研究及光伏应用

采用溶胶凝胶法,使用氨水催化正硅酸乙酯在乙醇溶剂中水解制备SiO_2溶胶,研究反应物浓度、退火温度及匀胶速率对多孔SiO_2减反射薄膜的光学性质的影响.结果表明,SiO_2溶胶颗粒尺寸随着乙醇用量的增加而减小,匀胶速率可以对薄膜厚度进行调整及制备出不同折射率的薄膜.乙醇用量为120 m L和转速为2000 r/min时,制备出的SiO_2薄膜具有最佳减反射性能.不同退火温度下,SiO_2溶胶颗粒尺寸、薄膜的光学性质均无明显改变.采用优化后的工艺制备出的多孔SiO_2减反射薄膜应用于Cd Te薄膜太阳电池上,在400 nm-800 nm波段,量子效率得到提高,积分短路电流密度提高了4.83%,光电转化效率由14.92%提高到15.45%.