TRP 模型及其在航空气象中的应用

通过对有关原始资料，采用等价正态偏差统计处理方法，得到了一系列原始资料与其正态化值之间的正态化转换关系；又通过引进TRP概率模型，建立了南京地区关于低云量和能见度的TRP方程；并在此基础上讨论了TRP模型在航空气象中的应用。     

细粒土路基填料承载比试验技术要求及影响因素

分析了美国、英国、日本和我国交通行业标准对承载比(CBR)试验要求的异同,强调了承载比试验的操作技术及注意事项,并对试验中的一些问题进行了有益的探讨。为了研究影响黏性土CBR值的主要因素,结合在建高速公路15组填料进行了物理、力学试验。分别从土体的颗粒组成、矿物成分以及黏土矿物成分等几方面研究了黏性土填料CBR值的影响。结果显示,在标准的试验方法和相同的试验条件下,当土体的塑性指数相同时,影响CBR值的因素主要是土体中矿物类型及其含量的多少,其次为黏粒组颗粒曲线分布情况及黏粉比m。     

论渔业法之对影响渔业船舶适航行为的法律责任

渔船管理是渔业产业管理的重要内容,而船舶适航性是渔船正常运行的重要保证。我国现阶段渔业产业中出现的船舶事故频发,其中很多是不适航导致的。文章从我国渔业监管现状出发,结合《渔业法》及其相关法律对影响船舶适航行为法律责任的相关规定,分析违法行为构成要件,发现依然存在处罚手段单一、处罚力度不够等问题,针对存在的原因,从完善对相关违法行为的认定,加强行政监管,丰富处罚方式,提高行政处罚标准等措施出发提出完善建议,从而减少渔业安全事故,推动我国渔业健康发展。     

自然资源动态监管体系研究

通过对自然资源综合监管过程中各项业务的分析统计,抓住各业务的控制点,形成关键指标,建立了自然资源监管指标体系,指标体系分为3个一级类指标、12个二级类指标和112个指标项.利用建立的监管指标体系实现了对自然资源地政业务"批、供、用、补",矿政业务"勘、采、用、储",地质灾害"调查、监测、防治"和执法检查"发现、查处"的...     

ACTIVE AND SEMI-ACTIVE CONTROL OF STRUCTURES UNDER SEISMIC EXCITATION

Considerable effort has been devoted to develop passive and active methods for reducing structural response under seismic excitations. Passive control approaches have already found application in practice. Active control methods, on the other hand, are being vigorously examined for application to civil structures. This paper investigates the application of active and semi-active control schemes to structures subjected to seismic excitations, and it focuses on the use of the sliding-mode control approach for the development of the control algorithms. The possibility of control redundancy with respect to the number of sliding constraints is taken into account in the controller design. Several sets of numerical results are obtained for a realistic 10-storey shear building, subjected to earthquake-induced ground motions and controlled by active or semi-active control schemes. It is observed that both active and semi-active control schemes can be used to reduce the dynamic response. Active control performs very effectively in reducing the structural response, but the required control force values can be quite large to limit its practical application in the case of large and massive buildings. Active regulation of linear viscous dampers was found unnecessary for this type of structural system, as it did not induce any significantly more reduction in the response than the dampers acting passively. On the other hand, it is shown that active regulation of stiffness can be used with advantage to reduce the response. © 1997 by John Wiley & Sons, Ltd.     

Disentangling Fabiana imbricata (Solanaceae) regeneration: The importance of disturbance and rainfall

In Mediterranean ecosystems, fire influences plant population dynamics and changes plant community structure by affecting germination and establishment of seeder shrubs. Fabiana imbricata is a long-lived seeder shrub with a broad distribution in South America. In Northwestern Patagonia grasslands there are many records of F. imbricata recruitment after fires. We hypothesized that recruitment is promoted by: 1) soil erosion that exposes deeply buried seeds; 2) direct fire effects such as heat that could break seed dormancy; 3) indirect fire effects (i.e. increase of light availability and elimination of allelopathic substances) and 4) water availability in spring. In field conditions, we tested the effects of shading and soil disturbance on F. imbricata recruitment and seed availability and distribution in the soil profile. Under controlled conditions, we investigated the influence of leaf leachate, light, heat and water on seed germination and seedling emergence. Seed germination was inhibited by leachate, and seedling emergence was inhibited by seed heated to 80 °C and 120° for 5 min. F. imbricata seedlings only emerged in germination treatments that simulated wet and very wet spring conditions. Fire and postfire wind that favor seed exposure, combined with high precipitation early in the growing season, would be necessary for successful shrub recruitment. When F. imbricata shrubland colonizes the grassland, it strongly modifies local vegetation structure, reduces species richness and increases fuel loads. F. imbricata is a key species in the ecosystem specially related to fire regime. Information on the postfire regeneration of this species would provide valuable knowledge of the changes in biomass accumulation in a fire-prone Mediterranean ecosystem.     

Long-term changes in cladoceran assemblages in the Danube floodplain area (Slovak–Hungarian stretch)

In this paper, the distribution of Cladocera species in the different sampling sites: the main channel/old river bed, parapotamal type side arms and plesiopotamal side arms, is described. The structure of cladoceran assemblages in the by-passed Danube section and in the adjacent floodplain water bodies has changed since the Gabčíkovo hydropower plant was put into operation. Great changes have been observed in the previous parapotamal side arm situated between river km 1840 and 1820, artificially fed with water from the head-race canal. The dominance of tychoplanktonic (benthic and phytophilous) species has increased, while the typical euplanktonic species have disappeared. Three characteristic groups of cladoceran assemblages were recorded when a different type of habitat was taken into consideration. Euplanktonic cladocerans prevailed on all sampling sites before damming. In periods after damming, littoral species, and later also a euplanktonic forms, dominated on the main channel sampling sites. In parapotamal and plesiopotamal side arms with rich littoral macrovegetation during periods after damming, phytophilous cladoceran species were the ones with the highest occurrence. The samplings from the first time period were rather homogenous. The samplings from the second and third period were more similar when considering the sample site than regarding the time period. In total, 64 cladoceran species were recorded in the course of 13 years (from 1991 to 2004). The increase in number of Cladocera species from 1991 to 2004 was significant. Chydorus sphaericus was found to be the most widely distributed species in the study area. The finding of Disparalona hamata is the first faunistic record from the central part of the Danubian watersheds.     

水电顾问集团北京院管理信息系统建设与思考

水电顾问集团北京院是中国水电行业最早成立的大型勘测设计研究院,也是全国勘察设计单位综合实力百强企业。北京院管理信息系统是由理正第二代管理信息系统和微软MOSS2007系统全面集成的综合系统,主要包括:企业信息门户系统、综合办公、知识图档、人力资源、经营管理、技术质量、项目管理系统、Exchange邮件系统、LCS消息系统。尤其在生产项目管理方面摸索出一套针对大型项目管理的计划分级编制、审批、执行、汇总、变更的应用模式,并对设计过程进行了有效控制。本项目顺利实施得益于我院对信息化项目的精心组织和策划,也充分体现了理正第二代管理系统平台在系统规划、系统集成、系统快速开发等方面的强大功能。     

基于知识标注的地理信息语义服务框架研究

基于空间语义学基础理论,将传统的地理信息服务技术与新兴的语义服务技术相结合,建立地理信息语义服务框架及知识标注方法体系,并应用于地理空间信息服务处理中,提供智能化、自动化的地理信息服务发现、组合与触发策略;设计基于文本挖掘算法的半自动知识标注引擎,提高服务处理自动化程度,实现包含丰富语义信息的地理空间语义服务的发布;建立基于规则和推理引擎的地理信息服务匹配与发现机制,提高服务发现效率;建立地理信息服务语义标注与服务匹配评价方法,采用基于空间关联规则的标注正确性评估策略,验证知识标注价值。     

基于WEB的用户服务与信息发布分系统设计与实现

用户服务与信息发布分系统是地质勘查遥感系统的重要分系统之一。分系统主要面向地质调查和项目管理人员, 以层次化、组件式思想设计开发, 并充分考虑了系统的可扩展性。采用B/S模式, 通过WebGIS发布技术、卫星遥感产品多维可视化发布技术、基于工作流控制的WEB信息发布、客户服务等, 直接进行地图数据、海量遥感影像数据和专题产品数据的快速检索、显示和下载, 分系统在试运行中取得了良好的应用效果。