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）.     

Ab initio study of the effects of Ag/Mn doping on the electronic structure of LiFePO_4

Based on density functional theory (DFT) of the first-principle for the cathode materials of lithium ion battery, the electronic structures of Li(Fe1-xMex)PO4 (Me = Ag/Mn, x = 0―0.40) are calculated by plane wave pseudo-potential method using Cambridge serial total energy package (CASTEP) program. The calculated results show that the Fermi level of mixed atoms Fe1-xAgx moves into its conduction bands (CBs) due to the Ag doping. The Li(Fe1-xAgx)PO4 system displays the periodic direct semiconductor characteristic with the increase of Ag-doped concentration. However, for Fe1-xMnx mixed atoms, the Fermi level is pined at the bottom of conduction bands (CBs), which is ascribed to the interaction be-tween Mn(3d) electrons and Fe(4s) electrons. The intensity of the partial density of states (PDOS) near the bottom of CBs becomes stronger with the increase of Mn-doped concentration. The Fermi energy of the Li(Fe1-xMnx)PO4 reaches maximum at x = 0.25, which is consistent with the experimental value of x = 0.20. The whole conduction property of Mn-doped LiFePO4 is superior to that of Ag-doped LiFePO4 cathode material, but the structural stability is reverse.     

KMgF_3∶Ni~(2+)晶体局域结构研究

采用赵敏光等的μkα模型,在强场图象中建立了3d^8电子组态的多重态计算公式,利用高阶微挠公式推导出顺磁g因数的计算解析表达式,并在能量矩阵、g因数与掺杂真实晶体结构常数之间建立起关联公式．将此模型应用于KMgF3：Ni^2＋晶体,计算其d—d跃迁光谱和EPR谱并与实验数据对比,发现KMgF3晶体在掺入Ni^2＋后其结构应发生同向延伸变化,畸变量△R=0．004nm,计算结果与实验值符合较好．     

论国家对农民工群体的政策缺失

伴随着国家城市化和工业化进程的加快,农民工成为一个越来越受人们关注的群体。在我国以户籍制为基础的城乡二元结构下,农民工有着非常复杂的身份,他们生活、工作并居住在城市,但是他们的户籍在农村。在我国,社会福利保障制度是以户籍制为基础划分的,这样特殊的背景导致了农民工群体在很多方面被排除在社会福利保障制度之外。目前,我国正在积极构建社会主义和谐社会,在这个大背景的感召下,农民工群体作为和谐社会的一个特殊群体,对他们的社会政策有待进一步完善。本文分析了农民工群体在医疗保险、用工制度、子女教育等方面的政策缺失,并提出了相应的政策建议。     

关于网络环境下高职图书馆人员素质问题的思考

网络化环境下高职院校图书馆信息人员在知识与能力方面面临着新的挑战,高职院校只有不断完善图书馆信息人员的素质结构,积极引进人才,增加资金投入,强化信息人员的现代信息技术理论知识和技能的培养和训练,才能解决读者信息需求和图书馆信息提供能力之间的矛盾。     

培养应用型人才，加快荷载与结构设计方法课程的教学改革

荷载与结构设计方法是为适应大土木工程专业要求而开设不久的一门专业基础课。就应用型人才培养及如何进行教学前的准备、教学实施等方面进行了探讨与阐述,并对教学实践进行了体会与思考。     

山西省农业用地结构优化的一般模型

本文以优化2015年山西省的农业用地结构为目的,以最大净收益为目标函数,以生态效益和社会效益为约束条件．建立了线性规划的一般数学模型,由所在地区的实际情况代入数据即可得到所在地区的农业用地结构优化的结果。     

浅谈城市道路沥青路面下封层的作用及施工工艺

从沥青路面下封层的主要作用及原理出发,阐述了城市道路沥青路面设置下封层的必要性及常用的施工工艺。     

空心楼板在吕梁体校训练馆的应用

从结构形式和经济比较方面,探讨了在框架结构中采用空心楼板代替井字梁的实用性和经济性。     

空间管桁架结构在晋中师范学院后勤综合楼工程中的应用

结合钢管结构在实际工程中的应用情况,介绍了其特点,并对钢管结构的设计及施工要点进行了简要的概述。