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地质学的发展分为三个阶段,即启蒙阶段、分析阶段和综合阶段,三个阶段的地质学各具特色,总体显示地质学从分析到综合的发展轨迹。地质学的三个发展阶段,形成了人们不同的思维方式,思维方式的转换逐步与地球的客观实际相一致。当前,地质学正处于综合阶段,科学的思维方式促成了新学说和理论的产生和发展,但是,过去阶段的思维方式具有遗传性质,它对新的学说和理论具有阻碍作用。 相似文献
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征地拆迁工作号称“天下第一难事”,十分棘手,不仅涉及国家、集体、个人利益的调整,而且影响经济社会发展大局和社会稳定,同时还关系到党和政府在人民群众中的威信和地位。新形势下对征地拆迁工作提出了更高的要求,既要保障发展,又要维护权益、构建和谐。因此,积极理顺体制,完善服务体系,促进征地拆迁工作的规范发展就显得尤为重要,值得探索和研究。 相似文献
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工业发展离不开土地,其发展速度和规模与土地交易的方式、价格密切相关。从分析工业用地结构和价格变化出发,分析了工业用地公开交易的必要性,结合工业用地的特点,探讨了工业用地招、拍、挂中必须理顺的关系,以保证工业生产的健康发展。 相似文献
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土地综合整治是在一定的区域内,按照土地利用总体规划确定的目标和用途,采取行政、经济、法律和工程技术手段,对土地利用结构和布局进行调整改造,以增加有效耕地面积,提高土地利用率和产出率,促进耕地规模经营、人口集中居住、产业集聚发展,改善生态环境的过程,它的关键在于形成建设合力。开展土地综合整治,促进土地节约集约利用,是“保发展、保红线”的结合点和统筹城乡发展的新平台, 相似文献
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根据青岛社会经济发展需求和水文发展方向,采取多种措施进行改革,理清发展思路,确定发展目标.取得了一些经验,其做法有一定推广价值。 相似文献
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西藏的战略地位十分重要,发展稳定的任务十分艰巨,西藏的发展、安全、稳定、和谐涉及国家的发展、安全、稳定、和谐。全国对口支援西藏是我国一项长期的政治任务和基本政策。我国历来关心西藏各族人民,重视西藏工作。特别是1980年代以来,中央先后4次召开西藏工作座谈会,针对西藏经济建设和稳定发展中的突出问题作出了一系列重大决策,取得了举世瞩目的成就。 相似文献
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江西省委十届六中全会指出:当前,全国和我省经济形势总体是好的,全省各级党组织和各级领导干部要大力发展丌放型经济,用活发展资源,加快与“长珠闽”地区体制机制对接;要大力推进体制创新、结构调整和经济增长方式转变,要坚持抓发展毫不动摇,努力实现经济既快又好的发展。 相似文献
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边坡稳定性分析的条分法如瑞典条分法、毕肖普条分法等,现仍是边坡分析和评估的主要方法。由于刚体条分的假定,如何简化和计算条间力,是各种方法里最为关键的问题。合理的简化成为不同方法的求解途径,也是影响其计算结果差别的主要和直接的原因。然而,带着这一简化的遗憾,各种条分法仍是我们目前分析边坡稳定性的主要手段。针对研究现状,尝试更合理求解条分法条间力的求解方法,对条块刚性接触的条间力,不做简化,而引入细胞自动机求解方法,通过迭代得到条间力的解,从而使超静定的边坡条分力学模型,得到了唯一收敛的静定解。编制了相应的程序软件CASlope。结果表明,这一求解途径是可行的,所求解的结果是合理的。 相似文献
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Arne Steen 《Organic Geochemistry》1986,10(4-6)
Sterane analyses in petroleum geochemistry are normally based on mass spectrometric detection of major fragment ions. This method has limited specificity and is much improved by detection of parent or metastable transition ions. The latter provide a less complex picture and suggest a better analytical approach, although the technique has only limited mass resolution.Geochemical parameters calculated from mass spectrometric data are dependent on the method employed. Accepted values of these parameters will, therefore, show some variations with the techniques used.Internal standards are necessary for quantitative determination of components by mass spectrometry. A recommended approach is to use a stable isotope labelled analogue of the compound being determined with, in the case of deuterium, only three or four isotopic atoms introduced into the molecule. Too few isotopic atoms will result in interference from the natural isotopes and too many will give analytical deviations. 相似文献
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Stages in the emergence of a participatory tourism development approach in the Developing World 总被引:3,自引:0,他引:3
Cevat Tosun 《Geoforum》2005,36(3):333-352
This study has attempted to examine and explain the stages in the emergence of the participatory tourism development approach under prevailing socio-economic, cultural and political conditions in developing countries without ignoring rural, peripheral areas of the developed world. It identifies three stages. These are: (1) the emergence of the pressures from external and internal factors on the central government to accept, support and facilitate the implementation of a participatory development approach, (2) the emergence of political will at central level, and (3) enacting legal measurements, re-structuring administrative systems at operational level and the actual community consultation or participation process. These stages are explored and elaborated under the guidance of three propositions. It concludes that political will at central level, enacting relevant legal measurements, empowering local communities and cooperation of dominant elite groups are sine qua non for the emergence and operationalization of the participatory tourism development approach as a pro-active tourism development strategy in a given developing country. 相似文献
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Toward a rapid probabilistic seismic vulnerability assessment using satellite and ground-based remote sensing 总被引:2,自引:1,他引:1
Natural hazards such as earthquakes threaten millions of people all around the world. In a few decades, most of these people will live in fast-growing, inter-connected urban environments. Assessing risk will, therefore, be an increasingly difficult task that will require new, multidisciplinary approaches to be tackled properly. We propose a novel approach based on different imaging technologies and a Bayesian information integration scheme to characterize exposure and vulnerability models, which are among the key components of seismic risk assessment. 相似文献
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H. P. Rossmanith K. Uenishi 《Fragblast: International Journal for Blasting and Fragmentation》2000,4(3):208-237
Bench blasting has a long tradition and yet the mechanics of throw and muck-pile formation is not clearly understood. This educational paper addresses bench blasting and muck-pile formation in a very simplified manner: a two-block system with ensuing formation of a two-block muckpile is investigated. It will become apparent that the study of a two-block system is perfectly sufficient for a deeper understanding of the problem of the entire bench blast and muck-pile formation. Two approaches will be presented: the momentum or impact approach and the wave propagation approach. The movement of the individual blocks and the formation of a 'two-block muck-pile' will be studied for both approaches and the differences in the results will be discussed. The purpose is to clarify, during blasting and ensuing block movement, the influence of the wave propagation action as compared to a purely gas-pressure based momentum treatment of muckpile formation. The results show that a wave propagation approach may lead to considerably different results for jointed rock mass and for certain combinations of parameters. 相似文献
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For non-linear dynamic problems, it has been recognized that an explicit time-integration method of approach is a very efficient way of solving the dynamic equations of motion. The numerical formulation and computation for such problems fall into the two general categories of finite elements and finite differences. Over the years, there have been many arguments between schools which adopt the finite element approach and those which adopt the finite difference approach. At one extreme, arguments areconcerned with the superiority of each approach and at the other end of the spectrum the arguments are about which approach is a subset of the other. The most common of these arguments are concerned with efficiency and accuracy. This publication addresses the accuracy issue with specific reference to explicit calculations in which the analysis domain is discretized into triangular or quadrilateral plane-strain elements. It concludes that if the same basic assumptions are made in the two approaches, they, will give identical answers for problems in this category. 相似文献
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Accurate identification of interactions of reactive solutes with porous media constituents is necessary for reliable risk
assessment studies and the development of efficient sanitation strategies. Standard parameter estimation procedures bear a
number of unsolved problems with respect to uniqueness and identifiability. This paper presents a new approach for the identification
of nonlinear interaction parameters of column outflow experiments. The procedure requires no a priori assumptions on the shape
of the underlying interaction process functions. Employing experimental data sets on cadmium and anthracene breakthrough as
case studies, possible applications of the new approach will be shown, and its features will be discussed. Error analysis
based on singular value decomposition of the sensitivity matrix quantifies the identification error. Identification procedures
without a priori shape information are superior to fixed parametrizations in diagnostic investigations, especially in cases
without reliable a priori knowledge on the sorptive interactions. 相似文献
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A convenient approach to performing stability analysis of concrete gravity dams is the so-called two-dimensional “gravity method.” However, concrete gravity dams located in valleys with sloped rock foundation abutments behave as three-dimensional (3D) structures and are often able to share compressive and shear loads between adjacent monoliths, especially when shear keys are present. A general 3D limit equilibrium method was developed in this study to compute global sliding safety factors (SSFg) by considering sequential load redistribution among adjacent monoliths when individual monoliths have mobilized their sliding strength. Two validation examples of the sliding safety assessment of existing dams are presented to illustrate the accuracy and efficiency of the proposed approach compared to that of the full 3D numerical analyses conducted using the distinct element method. It is shown that gravity dams may be formed by individual monoliths on sloped rock foundations that will slide if considered as isolated structures but will constitute a stable assembly when the load-sharing capabilities of monoliths are recognized in the analysis. 相似文献
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用加权多项式回归进行球状模型变差图的最优拟合 总被引:2,自引:0,他引:2
Wang Renduo 《地球科学》1986,(2)
本文提出了一种用加权多项式回归对球状模型和二级套合球状模型的变差函数进行最优拟合的方法。在已经较好地算出各实验变差函数值并选定球状模型或二级套合球状模型为理论模型的条件下,应用这种方法可以编出程序,并在计算机上快速、自动地算出最优拟合的变差图。其结果唯一确定,不因人而异,可避免人为的误差,又可为地质统计学计算的全盘自动化创造良好条件。经过几个实例验算表明,该方法简单,效果良好。 相似文献