中国城市化进程中基础设施建设和管理的问题与对策探讨   总被引：3，自引：0，他引：3  

段娟  文余源 《云南地理环境研究》2007,19(1):80-84

城市基础设施是城市赖以生存和发展的基础，是既为物质生产又为人民生活提供一般条件的公共设施。城市基础设施可以推动城市化进程，同时城市化也可以影响城市基础设施的发展。在阐明城市化进程和城市基础设施关系的基础上，分析了中国城市化进程中城市基础设施建设和管理的现状，并探讨了其存在的诸多问题，认为建立多元化的投融资格局、改革政府投资的决策和管理方式、积极推进城市基础设施行业的国有企业产权转换和机制转换将是中国城市化进程中优化城市基础设施建设和管理的必要举措。  相似文献   

Frontogenesis, evolution and the time scale of front formation   总被引：1，自引：0，他引：1  

Fang Juan  Wu Rongsheng 《大气科学进展》1998,15(2):233-246

Ｆｒｏｎｔｏｇｅｎｅｓｉｓ,ＥｖｏｌｕｔｉｏｎａｎｄｔｈｅＴｉｍｅＳｃａｌｅｏｆＦｒｏｎｔＦｏｒｍａｔｉｏｎＦａｎｇＪｕａｎ（方娟）ａｎｄＷｕＲｏｎｇｓｈｅｎｇ（伍荣生）ＳｅｖｅｒｅＭｅｓｏｓｃａｌｅｍｅｔｅｏｒｏｌｏｇｉｃａｌＲｅｓｅａｒｃｈＬａｂ...  相似文献   

地方环境立法与可持续发展   总被引：2，自引：1，他引：2  

汪娟  肖扬 《云南地理环境研究》2005,17(Z1):86-88

地方环境立法指省级和省级政府所在地的市以及经国务院批准的较大的市的人民代表大会及其常务委员会制定地方性法规并分别依照法定权限和程序制定、修改或废止在本行政区域内具有普遍效力的各种地方性环境法规、地方性环境规章的活动.地方环境立法在中国的环境立法体系当中占有重要地位,对于中国的环境保护工作具有重大意义.可持续发展是联合国环境与发展大会确立的未来共同发展战略,中国地方环境立法应当将可持续发展作为指导思想,并因地制宜,具有可操作性、科学技术性、规范性和有效性.  相似文献   

Geochemistry of sedimentary rocks and its relation to crustal evolution and mineralization in Southwest Yangtze Massif, China     

于炳松  裘愉卓等 《中国地球化学学报》1998,17(3):265-274

Through a systematic study on trace elements and REE geochemistry of mudstone deposited in the basin and lower slope environments during Upper Proterozoic to Triassic in the Southwest Yangtze Mssif,three geochemical abnormal horizons of which the geochemical characteristics are quite different from those of other horizons have been established for the first time.They are the Lower Cambrian,the Upper Devonian and the Upper Permian,As compared with the crustal evolution in this area.these three geochemical abnormal horizons are corresponding to the pulling-apart periods of geotectonic cycles.which illustrates that uncommon depositional sources puring into the basin from the earth‘s interior may be one of the most important causes to originate the geochemical anomalies in these lhrizons.Thus it can be realized that the geochemistry of post-Archean sedimentary rocks has a great deal to do with the crustal evolution and it can be used as a tracer to analyze the crustal evolution.The elements in this area are mainly concentrated in these geochemical abnormal horizons,and the degree of enrichment and deficiency of trace elements in other horizons is very limited.A series of research on mineralization indicates that the main strata-bound ore deposits discovered in the Southwest Yangtze Massif occur in the Cambrian,Devonian and Permian-Trassic strata.The results of isotope tracer resarch have also proved that most of the metallogenic elements in these ore deposits came from the host strata.which illustrates that the geochemical abnormal horizons may have made great contributions to these ore-forming processes.Thus it can be concluded that it is only the particular horizons corresponding to the particular periode of earth‘s evolution that can they be the significant source beds because only in these uncommon horizons there can be highly enriched metallogeinc elements.which may be one of the most important reasons for explaining the time-bound nature of mineralization.  相似文献   

Obtaining the free frequencies of the non‐rigid Earth     

Juan Getino  José M. Farto  José M. Ferrándiz 《Celestial Mechanics and Dynamical Astronomy》1998,71(2):95-108

In this paper, the mathematical algorithm elaborated by González, Getino and Farto (1998) is applied to four different nonrigid Earth models, in order to obtain the analytical expressions of the corresponding free frequencies. The solutions are studied, and the contributions of the different considered effects are evaluated. A numerical integration is also carried out, showing the validity of the obtained analytical solutions.  相似文献   

试论具有岭南文化特色的广州城市森林的建设   总被引：7，自引：0，他引：7  

粟娟  孙冰  黄家平  谢左章 《热带地理》1998,18(3):216-220

岭南文化作为一种地域文化,其标志和典范是广东文化,广州是岭南文化的中心,其特色须由岭南文化铸就,广州城市森林如何渗透岭南文化,具有独特的岭南风格,对于振兴岭南文化,塑造广州新的形象和风格,形成广州城市特色,具有重要意义,文中分析了广州城市森林实现具有备岭南文化特征的途径,认为根据文化内涵,表现形式和手法,具体体现为五个方面：（１）以营建岭南乡土树种片林为主体;（２）发展岭南园林;（３）引进抽象式园  相似文献   

钻杆接头表面高功率CO_2激光硬化行为的研究     

吴东江  孙友宏  李守春  庄娟 《吉林大学学报(地球科学版)》1996,(4)

利用正交试验法研究了高功率ＣＯ２激光工艺参数对钻杆接头表面硬化效果的影响，利用显微硬度计测定了硬化层硬度的分布规律及组织特征，采用计算机回归处理分析得出了Ｐ、Ｄ、Ｖ、Ｅ对硬化层面积大小因子ｈ·ｂ影响的表达式。研究结果为高功率ＣＯ２激光强化钻杆接头提供了一定的依据  相似文献   

一次强雹暴系统及其阵风锋的雷达回波研究   总被引：7，自引：3，他引：7  

刘娟  宋子忠  李金城 《气象》1996,22(1):13-17

作者介绍了在一次强雹暴系统的雷达探测中发现的阵风锋回波带。讨论了阵风锋回波带的性质、结构及其成因，分析了它对雹暴回波系统的反馈作用，指出了其和经典模式中阵风锋的不同之处。提出了这次雹暴系统维持和传播的自激机制，并且探讨了阵风锋回波带在短时预报中的应用。  相似文献   

A diffusion model for the development of a boundary layer in lakes   总被引：1，自引：0，他引：1  

Frank Peeters  Gabriel Piepke  Manuel Gloor 《Aquatic Sciences - Research Across Boundaries》1997,59(2):95-114

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Stratospheric ozone variability near the IMF sector boundary     

Jan Laštovička  Manuel Gil  Reviewer L. Křivský 《Studia Geophysica et Geodaetica》1988,32(3):313-317

Summary We search for the effects of the interplanetary magnetic field (IMF) sector boundary crossing (SBC) in upper stratospheric ozone. The SBUV data (Nimbus-7) at the 10, 3 and 1 hPa levels are analysed for latitudes 45° N and 55° N for winters of the period December 1979 to December 1982. An effect of the IMF SBC wos only found at the 10 hPa level. These first results concerning the IMF SBC effect in upper stratospheric ozone are rather preliminary.

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