On the electron density diagnostics of silicon <Emphasis Type="SmallCaps">viii</Emphasis> ion in solar transition region

The conditions for accurate electron density diagnostics in the solar transition region are discussed, and result shows that lines from Si?viii can provide an excellent tool for electron density diagnostics of the emitting plasma. For the Si?viii 1440.50 Å and 1445.75 Å lines, the principle of the electron density diagnostics is discussed for any intensity ratio. By the observed intensity ratio, the diagnostic results of the electron density for the quiet sun and the active region are calculated, and results indicate that in the quiet sun, the averaged electron density is \(\log (N_{e}) = 8.63\); while in the active region, the averaged density gets the maximum \(\log (N_{e}) = 8.86\) in the active region (B), and gets the minimum \(\log (N_{e}) = 8.38\) in the active region (E), where the electron density is in the unit of cm^?3. Finally, the relationship of intensity ratio and electron density is discussed, in the case of lower and higher electron density limits. This discussion is significant in the electron density diagnostics, which will be important for study on coronal heating and acceleration of solar wind.     

Improved form of wind wave frequency spectrum

The lower frequency part of the theoretical wind wave spectrum proposed by the authors (Wen et al. , 1988a, b,c) has been improved and the form of spectrum is appreciably simplified. In addition to the field data collected in the Bohai Sea region and used in the previous papers, those obtained in the Huanghai Sea, the East China Sea and the South China Sea have been employed so that the improved spectra can be verified on a more extensive observational basis. Computed results agree with the observations well. Further comparisons have been made between the proposed spectra and the JONSWAP spectrum. Though the two types of spectrum are close to each other in form, the former shows, as a whole, better agreement with the observation than the latter. By introducing an improved relation between the peak-ness factor and significant wave steepness, the spectrum contains only significant wave height and period as parameters. For spectra given in this form, the computed peak frequencies coincide approximately wit     

基于MapInfo的住宅小区物业管理信息系统研究

对GIS在住宅小区物业管理中的应用进行了研究,并以武汉南湖花园为实例,以Mapinfo为开发平台,以VB6．0为开发工具,建立了南湖花园物业管理信息系统,该系统基本实现了物业管理的各种基本功能。     

青藏高原羌塘地区几个关键地质问题的思考

羌塘地区是青藏高原最大的一块中比例尺地质调查空白区，许多关键地质问题集中于此。综合多年羌塘地区的地质实践，结合近年来1：25万地质调查的初步成果，提出龙木错一双湖板块缝合带、蛇绿岩、高压变质带、羌塘的基底、南北羌塘地层序列及地层格架、盆地成因类型、羌塘盆地与油气资源、羌塘地区的深部地质结构、羌塘地区生态与环境等方面存在的问题．期望起到抛砖引玉的作用，提供给在羌塘地区从事地质调查的同行们参考。     

遥测地震仪发射机电路分析及检修

在无线遥测地震仪器中 ,发射机长期使用容易出现输出功率下降、无输出功率、发射频率不准等故障。分析了发射机典型电路——石英晶体主振电路、倍频电路、激励级电路、功率放大级电路的基本原理。排除发射机的故障时 ,先从不同单元电路逐一检查、测试 ,判断故障类型 ,最后进行发射机总调试     

长江中下游晚中生代中基性岩的铅同位素特征:富集地幔的证据

长江中下游东段庐枞、怀宁、繁昌、铜陵和宁芜地区的中基性岩属于碱性系列 ,具有高的U ,Th含量和Th/Pb ,U/Pb比值 ,分别平均为 2 .82× 10 -6,9.5 6× 10 -6和 0 .6 35 ,0 .184。样品的初始铅同位素 (130Ma)组成为 :(2 0 6Pb/ 2 0 4Pb) i=17.6 5～ 18.6 0 ,(2 0 7Pb/ 2 0 4Pb) i=15 .4 2～ 15 .5 0 ,(2 0 8Pb/ 2 0 4Pb) i=37.6 7～ 38.0 4。形成中基性岩的原始岩浆来源于富集的岩石圈地幔 ,具有EMⅠ和EMⅡ ,且以EMⅡ为主的特征。和长江中下游西段黄石地区以及大别地块西南部玄武岩的比较表明 ,长江中下游地区岩石圈地幔高的Th/Pb和U/Pb比值可能和俯冲板片析出流体的交代有关。晚中生代时期 ,华北板块岩石圈地幔以EMⅠ特征为主 ,华南板块岩石圈地幔以EMⅡ特征为主 ,岩石圈地幔性质的区域性分布与印支期扬子板块深俯冲事件密切相关。虽然中国东部新生代玄武岩因岩石圈大规模减薄表现了亏损特征 ,但残留的富集岩石圈地幔在中国东部新生代玄武岩的Pb同位素中仍有所反映     

西藏得几蛇绿岩体中玻安岩的地球化学特征及其地质意义

西藏日喀则蛇绿岩是我国发育最好的蛇绿岩之一，目前有关日喀则蛇绿岩形成的构造背景存在多种不同的认识。作者在研究得几蛇绿岩剖面时发现存在玻安岩，从而为日喀则蛇绿岩具有弧前背景提供了直接证据。得几蛇绿岩中玻安岩类样品具有高硅、高镁、低铁的特征，岩石中Zr、Yb和Y的含量也较低，具有明显的玻安岩特征。根据这些岩石的地球化学性质，认为岩石是由早期经历过较高程度的部分熔融的残余在含水条件下再发生部分熔融形成的。得几蛇绿杂岩体部分形成于弧前环境。     

甘肃北山公婆泉盆地中生代地层特征与砂岩型铀成矿条件分析

根据野外实地考察，综合前人的工作资料，从地层结构、层位、沉积体系、岩性及形成砂岩型铀矿的条件出发，概括了公婆泉盆地中生代地层的主要特征；确定了目的层并浅要分析了砂岩型铀成矿条件，对下一步铀矿找矿工作具有一定的现实意义。     

大同煤田煤炭资源勘查与开发研究

大同煤田侏罗系煤炭资源临近枯竭,石炭二叠纪煤系将成为大规模开发对象。笔者对煤炭资源勘查与开发现状进行了分析,认为小煤矿的无序开采极大地浪费了煤炭资源,并加速了国营大矿的衰老报废,地质灾害和勘查资金短缺制约着大同矿区的发展。建议对煤炭及其共伴生矿产进行综合勘查与开发,合理有效地利用资源,采取措施积极防治地质灾害,进行环境保护,使煤炭工业可持续发展。     

Permeability Estimation with the Augmented Lagrangian Method for a Nonlinear Diffusion Equation

We consider numerical identification of the piecewise constant permeability function in a nonlinear parabolic equation, with the augmented Lagrangian method. By studying this problem, we aim at also gaining some insight into the potential ability of the augmented Lagrangian method to handle permeability estimation within the full two-phase porous-media flow setting. The identification is formulated as a constrained minimization problem. The parameter estimation problem is reduced to a coupled nonlinear algebraic system, which can be solved efficiently with the conjugate gradient method. The methodology is developed and numerical experiments with the proposed method are presented.