无机抗菌材料及应用   总被引：9，自引：0，他引：9  

姚爱华  李殿超  杨殿范 《世界地质》2001,20(2):171-174

无机抗菌材料是一种新近研制并开始获得应用的功能材料。简要介绍银系抗菌剂和氧化钛光触媒系抗菌剂的性质和抗菌机理、方法，并介绍应用这些无机抗菌剂制得的抗菌布料、抗菌塑料、抗菌卫生陶瓷和抗菌活性炭等各种抗菌产品。  相似文献   

典型井灌区农田土壤和地下水库调蓄汛雨径流的研究   总被引：2，自引：0，他引：2       下载免费PDF全文

孙仕军  丁跃元  田园  王韶华 《水科学进展》2001,12(2):190-195

针对80年代以来,北京市平原区地下水资源日益匮乏,必须减少径流流失与燕发消耗,利用汛雨与径流增加可用水资源,对在北京市东南郊天堂河流域水资源试验区取得的近20年的降水、地下水位等资料进行了较全面地整理;分析计算了不同水文年度0-3m层土壤水库的蓄水容量和调蓄能力;揭示了流域内不同层次地下水间的水力联系;研究了潜水、承压水随降水的多年变化关系,并证明在当前地下水埋深条件下,降水对浅层地下水位变化的影响是跨年度完成的.  相似文献   

铁矿物形成过程中的细菌作用研究   总被引：7，自引：2，他引：7       下载免费PDF全文

王恩德  王丹丽  王毅 《岩石矿物学杂志》2001,20(4):414-418

研究表明，细菌作用下形成针铁矿、水针铁矿和赤铁矿的过程中，细菌对矿物的作用贯穿于溶解吸附、络合、转换、结晶成核的全过程。细菌对矿物的作用具专属性。细菌作用不仅使原来矿物产生溶解、形成新矿物，生物化学显微环境的差异也可导致生成矿物的不同。同时细菌作用对矿物晶体结构、表面性质也产生影响。  相似文献   

Les surfaces boisées à l'échelle de la planète : usages conjoints pour la séquestration du carbone et la production d'énergie     

Anne Prieur  Jean-François Bonnet  Michel Combarnous 《Comptes Rendus Geoscience》2004,336(15):1323-1335

The role of forest ecosystems in the regulation of greenhouse effect at the global scale is developed here, from two points of view, sometimes considered as opposed: carbon storage and wood production for energy. A nomenclature is proposed to understand all the various mechanisms implied in carbon storage. A comparison is made between the effects on carbon emissions of storage alone and storage with wood fuel production. Use of wood energy is proved to be a ‘bonus’ that could optimise, in the middle and long terms, the use of fossil fuel reserves. To cite this article: A. Prieur et al., C. R. Geoscience 336 (2004).  相似文献   

气候大气和海洋的临界时间跨度与非线性作用结构     

Wang Zhiren  Wu Dexing  Chen Dake  Wu Huiding  Song Xueji  Zhang Zhanhai 《大气科学进展》2002,19(4):741-756

研究了气候海洋与大气的临界时间跨度及其非线性作用的大致结构。与预报的空间分辩率及系统的非线性强度相联系，气候大气和海洋的临界时间跨度可反映系统可预报的相对时间尺度。对于具有同样空间特征尺度的大气和海洋，海洋的最小临界时间跨度约是大气的9倍（可达数日至数十日）。一般（外源变化缓慢的）气候海洋与大气的一阶非线性越强，其临界时间跨度越小。气候海洋与大气非线性作用的大致结构是：通常与科里奥利力对流体运动的规范作用（如地转运动）有关，非线性作用随纬度增加而减弱。距平流场的切变结构及其沿经向与纬向上强度的比较直接改变气候大气和海洋的非线性作用（比如，向东的距平环流强度与经向环流强度相当时，非线性作用最强），较强的外部驱动（风应力和压弹梯度力）使非线性作用加大等等。  相似文献   

环贡嘎山生态旅游带(MGEB)保护性联合开发模式的初步研究     

朱创业  鄢和琳 《山地学报》2002,(Z1)

本文提出环贡嘎山生态旅游带(MGEB)的保护性联合开发思路,并预测了该联合开发区,环贡嘎山生态旅游 带,能使贡嘎山的生态旅游资源得到更有效的利用,且具有显著的生态效益。  相似文献   

Local environmental action plans and the `glocalisation' of post-socialist governance: The Macedonian experience   总被引：1，自引：0，他引：1  

Stefan Buzarovski 《GeoJournal》2001,55(2-4):557-568

Local Environmental Action Plans (LEAPs) are a useful starting point for the theoretical and empirical unravelling of the global post-Fordist socio-economic drive, within the framework of environmental policy devolution in Transition. Accordingly, this paper aims to identify the interconnected economic, social and political specifities involved in the formulation and institutionalisation of such projects in the Republic of Macedonia. Seven LEAPs - broadly representative of the immense micro-scale physical and social diversity of the country - have been selected for detailed review, so as to provide more fine-tuned insights that should be relevant for the wider LEAP process in Macedonia and beyond. Preliminary evidence about the realisation of these initiatives indicates that comprehensive implementation is highly dependent upon the realistic political and economic abilities (and interests) of local and national elites, plus international organisations. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   

Combined tide and wave influence on sedimentation patterns in the Upper Jurassic Swift Formation, south-eastern Alberta   总被引：1，自引：0，他引：1  

M. Molgat  & R. W. C. Arnott 《Sedimentology》2001,48(6):1353-1369

In south‐eastern Alberta, the Oxfordian Swift Formation comprises two unconformity‐bounded sequences. Sequence 1 consists of the shale member. It unconformably overlies Bathonian calcareous shale of the Rierdon Formation and consists dominantly of shale with uncommon hum‐ mocky cross‐stratified siltstone. The shale member comprises up to four parasequences that show a subtle upward‐fining stacking pattern, suggesting overall deepening in a storm‐dominated fully marine basin. Deposition of the shale member was terminated by a fall in relative sea‐level, which in turn initiated sequence 2. During lowstand, a network of north‐east‐ to south‐west‐trending meandering channels incised the top of sequence 1. Despite the preserved morphology of these channels, observations in core suggest that lowstand deposits are absent. These strata were most likely thoroughly reworked by ravinement processes associated with the ensuing transgression and are recorded only by a thin chert pebble lag. Also associated with transgression were significant changes in the physical and ecological conditions in the local Swift basin. These changes were related to modifications in basin configuration and the development of a low‐energy strait, which probably formed as a result of uplift of the Sweetgrass Arch. Within this newly configured basin, brackish‐water conditions prevailed, and sedimentation was dominated by suspension deposition of mud. Bed‐load sediment, composed mostly of very fine and fine sand, made up only a small part of the total sediment flux into the area and was transported principally by low‐energy combined flows with variable‐speed microtidal currents and a low‐energy oscillatory component related to storm waves. Sand was generally deposited in the form of small, discontinuous sand ridges that developed locally throughout the study area – it is these features that form the principal hydrocarbon reservoir bodies in the Swift Formation in the study area. After initiation, ridges built upwards and migrated laterally in response to transport and preferential local deposition of bed‐load sediment. Although common near the unconformity along the top of sequence 1, sand ridges also occur at several higher stratigraphic levels in sequence 2. These latter ridges, however, are not associated with regionally correlatable discontinuities but, instead, were initiated by local bed irregularities, possibly related to breaking internal waves, and were supplied with new sediment transported into the study area. The origin of these sand ridges is therefore not related to changes in relative sea‐level but, instead, to intrabasinal processes in a low‐energy strait.  相似文献   

多阶段构造地貌的水系统计特征——以山东半岛东北部为例     

杜国云  李晓燕 《山地学报》2001,(Z1)

通过对胶东半岛水系分枝状况的空间展布、主要河流中的河长分形计算 ,以及水库高程统计分析 ,反映了山东半岛东北部地区的水系统计特征与多阶段新构造抬升活动的相关关系。  相似文献   

谈重震联合反演问题   总被引：7，自引：0，他引：7  

关小平  黄嘉正 《物探与化探》1994,18(6):431-439

本文指出传统的重震联合反演中存在的问题,并建议充分利用地震资料作为形体参数进行分场,对分离出的目的层位的重力效应再利用Parker公式进行反演,以求出那些较深的或没有可靠地震资料的界面。  相似文献