乡村旅游区选址问题研究 --以昆明市为例

和一般旅游区一样,乡村旅游区具有满足旅游者不同需求的功能要素,由多个乡村旅游园区组成。在对昆明市周边乡村旅游区调查的基础上,对乡村旅游区的选址问题进行了探讨。与依托城市的时空距离、乡村旅游地的整体经济水平、农村特色和自驾车旅游是乡村旅游发展的4个背景条件。乡村旅游区选址受宏观和微观两个层次因子的影响:依托城市的出游能力、乡村旅游区的交通区位、旅游区位是3个宏观因素,乡村旅游区的聚集与屏蔽、乡村园区的周边环境状况是两个微观因素。最后从政策因素和旅游者品位变化的角度提出了影响乡村旅游区选址问题的两点补充意见。     

区位能研究

区位、区位选择和区位优势分析的基础是该文中提出的区位能,即分析各极点因其区位条件 而对区位能客体的吸引力.通过考察极点自身的属性和因极点位于某一区域而具有的该区域 内的属性,并设立一定的程序来确定不同目的类型极点的理论区位能、可置信区位能和可实践区位能.区域的各种区位能由其内各类极点的相应区位能组成.     

GPS-RTK技术在油田井位测量中的应用

结合新疆油田地形地貌特点，阐述了RTK技术在油田井位测量中的应用，分析了影响RTK作业的原因，指出了RTK技术在井位测量中的注意事项，并就RTK技术在实际工作中遇到的问题提出了有益的见解。     

CASS测图软件中DTM的建立与应用

本文探讨了CASS测图软件中DTM的建立及其在工程中的应用,并提出了在建立过程中应该注意的一些实际问题,供有关人员参考应用.     

Study on the earthquake fault of the Lulong ML=6.2 earthquake by precise relocation of aftershock

Introduction The Lulong county is about 75 km northeast to Tangshan in Hebei Province. An earthquake of ML=6.2 took place on October 19, 1982 about 4 km northeast to the county town. The epicenter of the mainshock is located at 39°57′N, 119°04′E by the Beijing seismic network. The 1976 Tang- shan 7.8 earthquake and the successive Luanxian 7.1, Ninghe 6.9 and the Lulong earthquake spread in NE-SW direction in space. SONG and WANG et al of Institute of Geophysics, China Seismolog…     

Quantitative analysis on tectonic deformation of active rupture zones

Introduction The Global Position System (GPS) may provide information about the crust movement of high precision in a large area, which significantly improve the capability of monitoring crustal movement over the area. In the last decade, studies on the global plate movement, the large scale block motions, the high-resolution crust movement of related monitored regions and tectonic de-formation fields have become the hotspot of spatial geodesy (ZHU et al, 2003; Wang et al, 2001; HUANG et…     

One-Dimensional qP-Wave Velocity Model of the Upper Crust for the West Bohemia/Vogtland Earthquake Swarm Region

The western part of the Bohemian Massif (West Bohemia/Vogtland region) is characteristic in the relatively frequent recurrence of intraplate earthquake swarms and in other manifestations of past-to-recent geodynamic activity. In this study we derived 1D anisotropic qP-wave model of the upper crust in the seismogenic West Bohemia/Vogtland region by means of joint inversion of two independent data sets - travel times from controlled shots and arrival times from local earthquakes extracted from the WEBNET seismograms. We derived also simple 1-D P-wave and S-wave isotropic models. Reasons for deriving these models were: (a) only simplified crustal velocity models, homogeneous half-space or 1D isotropic layered models of this region, have been derived up to now and (b) a significant effective anisotropy of the upper crust in the region which was indicated recently by S-wave splitting. Both our anisotropic qP-wave and isotropic P-and S-wave velocity models are constrained by four layers with the constant velocity gradient. Weak anisotropy for P-waves is assumed. The isotropic model is represented by 9 parameters and the anisotropic one is represented by 24 parameters. A new robust and effective optimization algorithm - isometric algorithm - was used for the joint inversion. A two-step inversion algorithm was used. During the first step the isotropic P- and S-wave velocity model was derived. In the second step, it was used as a background model and the parameters of anisotropy were sought. Our 1D models are adequate for the upper crust in the West Bohemia/Vogtland swarm region up to a depth of 15 km. The qP-wave velocity model shows 5% anisotropy, the minimum velocity in the horizontal direction corresponds to an azimuth of 170°. The isotropic model indicates the V_P/V_S ratio variation with depth. The difference between the hypocentre locations based on the derived isotropic and anisotropic models was found to be several hundreds of meters.     

地震自动定位的综合解决方案

针对已有两类地震自动定位方法各自的优点和限制，提出了综合利用这两类方法以形成一个统一系统的方案，希望以此提高地震自动定位能力。该方案的基本流程是：利用波形相关方法在连续地震波形上检测出地震事件并初定其震源位置和发震时刻；利用初定的震源位置和发震时刻，预测各台站各震相的到时；以预测的各震相到时为参考点，利用单台波形(单道或三分向)在该参考点附近精确测定震相到时；利用修定后的震相到时测定震源位置和发震时刻；根据震中距判定地震类型(地方震、近震、远震)，在预期的波形段自动测定波形最大振幅和相应周期，进而测定相应类型的震级(ML、Ms或mb)。     

云南地区地震精确定位及其构造意义分析

运用双差定位法，对云南区域数字地震遥测台网记录的1999—2003年云南地区ML≥1.0地震进行重新定位，得到3000多个地震的精确定位结果。重定位结果显示，在东经100。和103。线附近存在两个震源深度较深的区域，最深达50km，刚好对应金沙江一红河断裂带的北段和小江断裂带。这一结果一方面揭示出这两条深大断裂与地震活动之间存在密切关系，另一方面也表明重定位结果在震源深度和空间分布上都较以前有明显改善。同时，姚安、大姚地震序列的重定位结果也说明双差定位法是一种比较好的地震定位方法。     

P^—波定位方法的研究及软件编制

Ｐ＾－波定位方法是针对网内及网缘发生较大震级地震时，地震波记录限幅Ｓ＾＝难以辨认的情况，而编；与的单震相定位程序。该程序可由数字化仪输入地震波到时数据，然后进行定位，定位计算分两步进行，即初定和修定，初定仅根据区域台风提供直达波到时，列出走时方程，将走时方程线性化，解出四个震源参数，为了防止输入的个别错误数据影响定位，采取了图形显示的方法。