全文获取类型
收费全文 | 827篇 |
免费 | 22篇 |
国内免费 | 5篇 |
专业分类
安全科学 | 54篇 |
废物处理 | 1篇 |
环保管理 | 233篇 |
综合类 | 97篇 |
基础理论 | 62篇 |
污染及防治 | 6篇 |
评价与监测 | 21篇 |
社会与环境 | 59篇 |
灾害及防治 | 321篇 |
出版年
2023年 | 3篇 |
2021年 | 6篇 |
2020年 | 8篇 |
2019年 | 17篇 |
2018年 | 12篇 |
2017年 | 18篇 |
2016年 | 27篇 |
2015年 | 15篇 |
2014年 | 8篇 |
2013年 | 28篇 |
2012年 | 23篇 |
2011年 | 21篇 |
2010年 | 17篇 |
2009年 | 19篇 |
2008年 | 20篇 |
2007年 | 37篇 |
2006年 | 22篇 |
2005年 | 22篇 |
2004年 | 29篇 |
2003年 | 24篇 |
2002年 | 21篇 |
2001年 | 11篇 |
2000年 | 20篇 |
1999年 | 26篇 |
1998年 | 34篇 |
1997年 | 40篇 |
1996年 | 46篇 |
1995年 | 62篇 |
1994年 | 34篇 |
1993年 | 39篇 |
1992年 | 24篇 |
1991年 | 23篇 |
1990年 | 15篇 |
1989年 | 3篇 |
1988年 | 5篇 |
1987年 | 13篇 |
1986年 | 7篇 |
1985年 | 3篇 |
1984年 | 6篇 |
1983年 | 9篇 |
1982年 | 4篇 |
1981年 | 4篇 |
1980年 | 5篇 |
1979年 | 4篇 |
1978年 | 3篇 |
1977年 | 3篇 |
1976年 | 4篇 |
1973年 | 2篇 |
1972年 | 2篇 |
1971年 | 5篇 |
排序方式: 共有854条查询结果,搜索用时 15 毫秒
71.
Kenneth G. Maxey Norman H. Starler 《Journal of the American Water Resources Association》1987,23(5):749-759
ABSTRACT: In the past, development of Federal water resource projects depended heavily or exclusively on Federal financing of construction costs. However, pressures on the Federal budget, environmental issues, and the notion that there are economic efficiency gains when beneficiaries of Federal water resource projects increase their cost share are causing changes. The case of the Central Arizona Project Plan 6 is a noteworthy example of the transition to more non-Federal participation in water resource development. This is because the non-Federal financing is to be provided for a project already under construction. The negotiation and terms of the Plan 6 financing agreement between the Department of the Interior and multiple interests in Arizona are used as an example of how Federal water project cost sharing is in a state of transition. The negotiation process is described, a financial analysis is provided, and the terms of the agreement and policy issues that were deliberated in the Executive Branch of the Federal Government are discussed. 相似文献
72.
Paul N. Wilson Teddy J. Goldammer James C. Wade 《Journal of the American Water Resources Association》1988,24(1):1-9
ABSTRACT: Urban wastewater can be a valuable source of water and plant nutrients for agricultural producers, particularly in arid regions. The scientific literature reveals cautious optimism concerning the biological, institutional, and economic viability of irrigating crops with secondary-treated effluent. A derived effluent demand function for agricultural producers near Tucson, Arizona, reveals a potential annual demand of 11,000 acre-feet under present price and proposed delivery system conditions. In this case, wastewater could be exchanged for ground water and both the urban and rural areas would gain. 相似文献
73.
ABSTRACT: Because of its importance and the perceived inability of private sector sources to meet water demands, many countries have depended on the public sector to provide water services for their populations. Yet this has resulted in many inefficient public water projects and in inadequate supplies of good quality and reliable water. Decentralization of water management, including the use of water markets, cannot solve all of these water problems, but it can improve the efficiency of water allocation. When given adequate responsibility and authority, water user associations have effectively taken over water management activities at a savings to tax payers. Moreover, water markets add the potential benefit of improving water efficiency within a sector as well as providing a mechanism for reallocating water among sectors. The key question involves developing innovative mechanisms for reducing the transaction costs of organizing water users and of making water trades. Water rights need to be established which are recorded, tradable, enforceable, and separate from land if markets are to operate effectively. Also, institutions are needed that effectively resolve conflicts over water rights, including third party impacts and water quality concerns. 相似文献
74.
75.
地球系统是宇宙系统的全息缩影,地球上的灾害和天体之间具有全息关系,同样有恒定的周期性。本文根据全息理论对灾害进行分析预测,并建议在灾害研究中应用全息理论. 相似文献
76.
本文以定量分析为主要手段,详细研究了吉林省农业病虫害发生的时间过程规律和空间分布规律,深入探讨了环境因子对农业病虫害的影响,综合评价了病虫害防治工作的效果。 相似文献
77.
本文分析了江苏省近几十年来、特别是80年代以来冬季气温的变化特征,根据农业灾害发生的条件,讨论了“暖冬”对农业生产及农业灾害的影响,为农业生产部门和防灾抗灾部门决策提供科学依据. 相似文献
78.
79.
Basharat A. Pitafi James A. Roumasset 《Journal of the American Water Resources Association》2006,42(6):1441-1450
Abstract: Conserving the watershed can help to preserve ground water recharge. Preventing overuse of available water through pricing reforms can also substantially increase the value of an aquifer. Inasmuch as users are accustomed to low prices, efficiency pricing may be politically infeasible, and watershed conservation may be considered as an alternative. We estimate and compare welfare gains from pricing reform and watershed conservation for a water management district in Oahu that obtains its water supply from the Pearl Harbor aquifer. We find that pricing reform is welfare superior to watershed conservation unless the latter is able to prevent very large recharge losses. Watershed conservation that yields net gains in combination with pricing reform may cause net losses without the pricing reform. If adoption of watershed conservation delays the implementation of pricing reform, the benefits of the latter are significantly reduced. 相似文献
80.
Eric C. Schuck Gareth P. Green Janet Clements W. Marshall Frasier 《Journal of the American Water Resources Association》2006,42(6):1483-1492
Abstract: Agricultural runoff, such as dissolved mineral salts and selenium, creates pronounced downstream impacts to agricultural producers and to wildlife. The ability to manage these problems efficiently depends critically on the institutional pricing structure of irrigation water delivery agencies. An important characteristic of irrigation water delivery is whether irrigators pay per unit of water received or make one payment regardless of the quantity of water received. In this study we compare the effectiveness of agricultural runoff reduction policies in two regions that employ these different water pricing structures. We find that reduction policy is more effective and can be achieved at a lower cost when water is priced on a per unit basis and that growers have greater incentive to act on their own to reduce runoff problems. Operating under a per unit pricing system encourages water conservation and runoff reduction, which creates public benefits that are not achieved under the single-payment, fixed allotment method of irrigation water delivery. 相似文献