首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   222篇
  免费   14篇
  国内免费   19篇
安全科学   30篇
废物处理   2篇
环保管理   81篇
综合类   62篇
基础理论   37篇
环境理论   5篇
污染及防治   4篇
评价与监测   2篇
社会与环境   21篇
灾害及防治   11篇
  2024年   2篇
  2023年   3篇
  2022年   1篇
  2021年   12篇
  2020年   5篇
  2019年   15篇
  2018年   8篇
  2017年   9篇
  2016年   9篇
  2015年   4篇
  2014年   13篇
  2013年   21篇
  2012年   19篇
  2011年   18篇
  2010年   13篇
  2009年   7篇
  2008年   11篇
  2007年   15篇
  2006年   14篇
  2005年   11篇
  2004年   5篇
  2003年   7篇
  2002年   10篇
  2001年   1篇
  2000年   4篇
  1999年   4篇
  1998年   4篇
  1997年   1篇
  1996年   3篇
  1995年   2篇
  1991年   1篇
  1988年   1篇
  1983年   1篇
  1971年   1篇
排序方式: 共有255条查询结果,搜索用时 15 毫秒
51.
通过对江苏省地质遗迹的详细调查,选出了江苏十大地质遗迹,即:宁镇山脉岩石地层建组层型剖面群,南京汤山古人类遗址及洞穴群,连云港—东海超高压变质带及科学深钻,南京六合火山群、雨花石群、石柱林群,溧阳上黄水母山高级灵长类及古哺乳动物化石遗址,泗州城地质灾害遗址,南京江宁娘娘山破火山口与碱性火山杂岩体,茅山薄皮构造—飞来峰,盐城海岸带变迁及湿地,太湖及周边地质遗迹。这些地质遗迹均具很高的科学价值、美学价值和稀有性,应加强保护,在保护中加以开发。  相似文献   
52.
为破解文化和旅游融合发展过程中的困难和挑战,借鉴共生理论、社会互动理论和互惠规范理论,构建了文化和旅游"共生—共建—共享"的关系网络,并进一步从政府、企业和旅游者角度提出文旅融合发展路径,最终构建了文化和旅游在理念、职能、产业、市场、服务和交流方面的六大融合矩阵。  相似文献   
53.
中国的自然保护地具有生态和文化双重价值,文化景观作为自然与文化的交界面,如何识别其价值对中国自然保护地的管理至关重要。以泰山为例,通过古籍文献和实地勘察等方法,从历时性角度对泰山的文化景观价值演变进行剖析。研究发现,泰山文化景观价值经历了山岳崇拜的自然价值、君权神授的政治价值、佛道信仰的宗教价值、祭祀游居的民俗价值及保护利用的综合价值五个阶段。结论认为:自然保护地文化景观价值的演变具有一定的规律性:名山自然保护地的文化景观价值演变是从自然到文化再到综合、从御到民、从单一到多元、从分离到融合的过程;自然保护地文化景观价值的构成要素包括思想基础、环境条件、行为方式及空间结果四部分,具有鲜明的完整性、系统性和动态性特征。文章还对自然保护地文化景观价值的识别策略进行了讨论,为相应类型的国家公园和其他类型自然保护地建设提供参考。  相似文献   
54.
从活性污泥、农药厂土壤中分离筛选到8株产絮凝剂细菌,经过复筛得到一株高效絮凝剂产生菌NT-1.该菌产絮凝剂的适宜碳源为蔗糖,适宜氮源为酵母膏,初始pH值7.0~8.0,装液量45~75 mL/150 mL,接种量3%~6%,摇床转数为150 r/min,32 ℃培养36~72 h;产生具有高效稳定絮凝活性的絮凝剂,对高岭土悬液的絮凝率均在90%以上.  相似文献   
55.
56.
Abstract

A three-year study over the Bai, Jingpo and Huayaodai communities in Yunnan Province reveals that the community development is significantly influenced in various ways by such cultural factors as the concepts of development; concepts and traditions of inter-community relationships, consumption, marriage and gender; patterns of decision-making and production, resource and income allocation; as well as the role of information dissemination systems, religion and ritual. Based on the analysis over the interactive relevance between each factor and community development, some strategies and methods for dealing with such a cultural relevance in development projects are recommended.  相似文献   
57.
ABSTRACT Attitudes toward the development of the American West have undergone important changes over the past century just as the nature of water resources as factors in development have changed. Viewing these changes processually, stages for water resources definition and use can be identified in the total process of western cultural development. The first stage involves the value of water resource development as a stimulus to population and economic growth in the West. The second stage, still in process', adopts a dominant cultural norm which sees water resource development as inevitable if not necessary to keep up with growth. A third stage to this evolutionary process is incipient. Future cultural values and thinking with respect to water resource development will be to look at development as a means for controlling or managing both the location and quantity of population and economic growth. To this end planners will have to become concerned with the questions of human adaptation. Concern will have to be given to the problems of getting a living which enables individuals to meet the subsistence needs of self and family, to establishing community which provides for cooperation among individuals and the management of conflict, to establishing improved communication which promotes interpersonal interaction, and for fostering innovation which provides the new ideas necessary to adapt to new environmental situations.,  相似文献   
58.
The Thar Desert of western India is known for its rich and ancient culture system and traditions. The communities have long been part of the Thar Desert ecosystem and have evolved specific strategies to live in harmony with its hostile environment. This culture has provided several miracle plants of immense food and medicinal value to modern civilisation. The ancient rural livelihood knowledge system reflects time-tested techno-scientific knowledge with a proven track record of sustainability, especially during natural hazards like drought and famines. In addition, several of the traditional skills of local communities in arts and crafts, music and instruments have made modern man aware of the art and techniques of sustainably utilising local biological resources and preserving their biodiversity along with using waste products of the forests, without harming the desert ecosystem. Traditional cultural and socio-religious values are fast dwindling under the impact of materialistic approach, industrialisation and development. This paper endeavours to illustrate the need to assist and propagate indigenous rural livelihood systems rather than mindlessly replace or abandon them as a result of state bureaucracies.  相似文献   
59.
汪昉 《资源开发与市场》2005,21(6):569-570,573
西南地区旅游资源丰富多样,但经济发展水平相对落后.要实现西南地区经济社会的腾飞,必须实施生态文化旅游科技发展战略.在分析西南地区旅游资源特点的基础上,指出了旅游发展的战略目标及主要任务,并提出了相关建议.  相似文献   
60.
ABSTRACT: This article reports the findings of a case study of a major California water management district's effort to change its management approach. The following key findings and factors have influenced the Salinas basin management plan (BMP) and its progress: (1) the Salinas Valley is an economy dominated by highly sophisticated irrigated agriculture dependent on ground water; (2) a persistent pattern of agricultural overdraft of ground water has hurt growers primarily in the north end of the valley via induced saline intrusion of irrigation wells; (3) a complex set of water institutions, property and water rights, and land lease practices offer little incentive for good stewardship of land and water; and (4) the BMP approach initially may have intensified tension among growers and between growers and other water user groups. Water rules and practices in the Salinas Valley and Monterey County have evolved through a long historical process of adaptations. Therefore, any significant changes in local water use practices need to be understood in terms of cultural change, that is, changes in deeply held values, beliefs, and assumptions. We believe the BMP and the MCWRA are succeeding when evaluated from this evolutionary perspective. The fact that both still exist relatively intact testifies that they are working, albeit slowly.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号