全文获取类型
收费全文 | 2744篇 |
免费 | 229篇 |
国内免费 | 370篇 |
专业分类
安全科学 | 644篇 |
废物处理 | 52篇 |
环保管理 | 521篇 |
综合类 | 1170篇 |
基础理论 | 301篇 |
环境理论 | 4篇 |
污染及防治 | 190篇 |
评价与监测 | 144篇 |
社会与环境 | 165篇 |
灾害及防治 | 152篇 |
出版年
2024年 | 14篇 |
2023年 | 60篇 |
2022年 | 59篇 |
2021年 | 95篇 |
2020年 | 95篇 |
2019年 | 110篇 |
2018年 | 90篇 |
2017年 | 135篇 |
2016年 | 146篇 |
2015年 | 137篇 |
2014年 | 128篇 |
2013年 | 194篇 |
2012年 | 181篇 |
2011年 | 188篇 |
2010年 | 147篇 |
2009年 | 160篇 |
2008年 | 115篇 |
2007年 | 164篇 |
2006年 | 176篇 |
2005年 | 150篇 |
2004年 | 102篇 |
2003年 | 128篇 |
2002年 | 90篇 |
2001年 | 80篇 |
2000年 | 69篇 |
1999年 | 65篇 |
1998年 | 37篇 |
1997年 | 27篇 |
1996年 | 22篇 |
1995年 | 17篇 |
1994年 | 18篇 |
1993年 | 12篇 |
1992年 | 8篇 |
1991年 | 9篇 |
1990年 | 11篇 |
1989年 | 9篇 |
1988年 | 14篇 |
1986年 | 4篇 |
1985年 | 5篇 |
1984年 | 9篇 |
1983年 | 4篇 |
1982年 | 10篇 |
1981年 | 5篇 |
1980年 | 9篇 |
1978年 | 6篇 |
1977年 | 3篇 |
1976年 | 4篇 |
1974年 | 3篇 |
1972年 | 4篇 |
1971年 | 7篇 |
排序方式: 共有3343条查询结果,搜索用时 0 毫秒
991.
992.
在分析夹潦草堂旅游风景区背景要素和制约因素的基础上,遵循史学文化、知识、淳真自然的三大设计理念,采用圈层递进的总体布局构思,设计了7个主题区域的空间布局,开发出修学旅游、观光旅游、度假旅游、森林探险旅游等四大主导旅游产品。 相似文献
993.
Karel De Greef Frans Stafleu Carolien De Lauwere 《Journal of Agricultural and Environmental Ethics》2006,19(1):57-66
Public debate on acceptable farm animal husbandry suffers from a confusion of tongues. To clarify positions of various stakeholder
groups in their joint search for acceptable solutions, the concept of animal welfare was split up into three notions: no suffering,
respect for intrinsic value, and non-appalling appearance of animals. This strategy was based on the hypothesis that multi-stakeholder
solutions should be based on shared values rather than on compromises. The usefulness of such an artificial value distinction
strategy was tested in a small series of experiments. The results demonstrate that the chosen concept to distinguish between
values is effective in a stakeholder context. Farmers’ views on doing good to animals appeared to be largely based on their
value to prevent suffering and predominantly focused on the provision of regular care. Their priority for this value is clearly
shared with other stakeholders, providing a basis for joint solutions. The concept of intrinsic value does not play a discernable
role in farmers’ considerations. Based on the varying views on welfare, it can be inferred that there is a gradual rather
than a principal difference between government legislation and farmers’ values, whereas public perception and acceptance of
farm practices remains complicated. Distinction between value groups and focusing on a selected notion (such as no suffering)
proved to be effective in bringing representatives of stakeholder groups together, but is unlikely to bridge the emotional
gap between commercial farm practices and public ideals. 相似文献
994.
Yusuf M. Mohamoud Rajbir S. Parmar 《Journal of the American Water Resources Association》2006,42(3):755-768
ABSTRACT: Methods to estimate streamflow and channel hydraulic geometry were developed for unpaged streams in the Mid‐Atlantic Region. Observed mean annual streamflow and associated hydraulic geometry data from 75 gaging stations in the Appalachian Plateau, the Ridge and Valley, and the Piedmont Physiographic Provinces of the Mid‐Atlantic Region were used to develop a set of power functions that relate streamflow to drainage area and hydraulic geometry to streamflow. For all three physiographic provinces, drainage area explained 95 to 98 percent of the variance in mean annual streamflow. Relationships between mean annual streamflow and water surface width and mean flow depth had coefficients of determination that ranged from R2= 0.55 to R2= 0.91, but the coefficient of determination between mean flow velocity and mean annual streamflow was lower (R2= 0.44 to R2= 0.54). The advantages of using the regional regression models to estimate streamflow over a conceptual model or a water balance model are its ease of application and reduced input data needs. The prediction of the regression equations were tested with data collected as part of the U.S. Environmental Protection Agency (USEPA) Environmental Monitoring and Assessment Program (EMAP). In addition, equations to transfer streamflow from gaged to ungaged streams are presented. 相似文献
995.
Steve H. Hanke Lennart de Mare 《Journal of the American Water Resources Association》1982,18(4):621-626
Shortcoming associated with past water demand studies are evaluated. To overcome these shortcomings, pooled, time series, cross section data from -6, Sweden, are used in an ordinary Least squares analysis to estimate the demand for residential water. Elasticities for five variables, including price and income, are estimated. An approach for the conduct of future water demand studies is suggested. 相似文献
996.
直线电机轮轨系统采用直线感应电机牵引 ,轮轨系统支承导向 ,是一种在技术、经济、环保方面均具有良好性能的新型城市轨道交通系统。该系统有两种主要技术模式 ,均有良好的安全运营记录。笔者介绍了系统的性能和设计特点 ;从牵引制动系统、控制系统、管理系统、养护维修系统以及防灾系统 5个方面对系统的安全性设计方法进行了总结 ;认为该系统具有良好的安全性能 ,先进的安全管理理念以及健全的安全防护系统 ;特别强调对该系统进行的安全设计研究 ,将为提高我国城市轨道交通系统的安全性提供新的思路 相似文献
997.
The Cache River of southernmost Illinois is used as a case study for developing and demonstrating an approach to quantitatively
link (1) national agricultural policy and global agricultural markets, (2) landowner's decisions on land use, (3) spatial
patterns of land use at a watershed scale, and (4) hydrologic impacts, thus providing a basis to predict, under a certain
set of circumstances, the environmental consequences of economic and political decisions made at larger spatial scales. The
heart of the analysis is an estimation, using logistic regression, of the affect of crop prices and Conservation Reserve Program
(CRP) rental rates on farmland owner's decisions whether to reenroll in the CRP or return to crop production. This analysis
shows that reasonable ranges for crop prices (80%–150% of 1985–1995 values) and CRP rental rates (0–125% of 1985–1995 rates)
result in a range of 3%–92% of CRP lands being returned to crop production, with crop prices having a slightly greater effect
than CRP rental rates. Four crop price/CRP rental rate scenarios are used to display resulting land-use patterns, and their
effect on sediment loads, a critical environmental quality parameter in this case, using the agricultural non point source
(AGNPS) model. These scenarios demonstrate the importance of spatial pattern of land uses on hydrological and ecological processes
within watersheds. The approach developed can be adapted for use by local governments and watershed associations whose goals
are to improve watershed resources and environmental quality. 相似文献
998.
发动机的绿色化学设计 总被引:3,自引:0,他引:3
发动机绿色化学设计以发动机化学设计概念和发动机化学反应器模型为基础,旨在实现发动机材料选择、能源利用和环境效应之间的最佳综合效益.发动机燃料系统绿色化学设计的范畴包括:汽油无铅化与汽油抗磨性,柴油低硫化与柴油润滑性,生态燃料与生态摩擦学,汽油机沉积物与汽油清净剂,柴油机颗粒(碳烟)与消烟助燃剂. 发动机润滑系统绿色化学设计的范畴包括:润滑油和添加剂与排放催化转化,润滑剂生物降解性与生物降解润滑剂,润滑油使用与质量监控. 发动机燃料/润滑系统材料绿色化学设计的范畴包括:催化助燃/补燃作用,低散热发动机高温润滑,发动机机械与化学材料制造. 发动机绿色效应的实现取决于发动机诸系统绿色化学设计问题的解决程度. 相似文献
999.
1000.