全文获取类型
收费全文 | 4953篇 |
免费 | 139篇 |
国内免费 | 61篇 |
专业分类
安全科学 | 270篇 |
废物处理 | 168篇 |
环保管理 | 1255篇 |
综合类 | 537篇 |
基础理论 | 1358篇 |
环境理论 | 8篇 |
污染及防治 | 999篇 |
评价与监测 | 328篇 |
社会与环境 | 175篇 |
灾害及防治 | 55篇 |
出版年
2023年 | 59篇 |
2022年 | 55篇 |
2021年 | 55篇 |
2020年 | 63篇 |
2019年 | 69篇 |
2018年 | 122篇 |
2017年 | 134篇 |
2016年 | 180篇 |
2015年 | 121篇 |
2014年 | 163篇 |
2013年 | 409篇 |
2012年 | 235篇 |
2011年 | 306篇 |
2010年 | 203篇 |
2009年 | 239篇 |
2008年 | 262篇 |
2007年 | 258篇 |
2006年 | 229篇 |
2005年 | 196篇 |
2004年 | 180篇 |
2003年 | 149篇 |
2002年 | 140篇 |
2001年 | 87篇 |
2000年 | 96篇 |
1999年 | 69篇 |
1998年 | 75篇 |
1997年 | 61篇 |
1996年 | 63篇 |
1995年 | 78篇 |
1994年 | 75篇 |
1993年 | 66篇 |
1992年 | 58篇 |
1991年 | 39篇 |
1990年 | 38篇 |
1989年 | 36篇 |
1988年 | 31篇 |
1987年 | 39篇 |
1986年 | 40篇 |
1985年 | 39篇 |
1984年 | 44篇 |
1983年 | 44篇 |
1982年 | 52篇 |
1981年 | 43篇 |
1980年 | 31篇 |
1979年 | 15篇 |
1978年 | 29篇 |
1977年 | 16篇 |
1976年 | 14篇 |
1972年 | 7篇 |
1971年 | 9篇 |
排序方式: 共有5153条查询结果,搜索用时 250 毫秒
521.
Myron MoInau Walter J. Rawls David L. Curtis C. C. Warnick 《Journal of the American Water Resources Association》1980,16(3):428-432
ABSTRACT: Data from a network of 45 shielded precipitation gages on the Reynolds Creek Experimental Watershed in Southwestern Idaho were analyzed to determine the optimum gage density for estimating mean annual precipitation. Four subsets of the 45 gage network were used to derive a curve of mean annual precipitation versus number of gages with a confidence band at the 95 percent level. When less than 20 gages were used in the estimate, the confidence interval widens rapidly. Estimates were improved by stratifying gages on the basis of plant cover class or by elevation bands. Sixty-four percent of the variation in mean annual precipitation was accounted for by elevation and cover class. The aspect and hydrologic soil classification were not statistically significant. 相似文献
522.
ABSTRACT: This paper first discusses the results of sensitivity analyses conducted on various parameters of the San Francisco Stormwater Model ta version of WREM) and the Penn State Runoff Model in terms of their impact on outflow hydrographs. The parameters considered within a idealized catchment include: basin shape, imperivous fraction, overland roughness and slope: deterntion depth; infiltration capacity; and hyetograph timing. Second, the results for the hypothetical catchment are extended to the lazzard laboratory surfaces (asphalt, grass, roofing material) as a mean of illustrating the need for changes in model structure, as opposed to continued parameter adjustment Finally the effect of altering the scale of hydraulic representation in the surface runoff and sewer transport calculations are demonstrated for two gaged watersheds in Hamburg, West Germany. 相似文献
523.
524.
David R. Hargis Charles A. McCauley 《Journal of the American Water Resources Association》1981,17(3):494-497
Two wellfields have been developed to provide water for a coal fired electric generating station in Arizona. Wellfield No. 1 penetrates the unconfined Coconino Sandstone aquifer, and wellfield No. 2 penetrates the composite Kaibab Limestone-Coconino Sandstone aquifer where ground water occurs under confined conditions. A well in each wellfield was pumped and water level drawdown data were collected before and after acidizing. The drawdown data at the various pumping rates were analyzed to determine the potential benefits of acidizing production water wells in both wellfields. After acidizing, the specific capacity of the well in wellfield No. 1 was improved about 50 percent at water production rates ranging from about 200 to 500 gallons per minute (gpm) (13 to 32 liters per second (lps)). After acidizing, the specific capacity of the well completed in wellfield No. 2 was improved about 100 percent at pumping rates ranging from about 1,250 to 2,200 gpm (79 to 139 lps). An annual saving of approximately 11 percent in pumping costs can be realized in wellfield No. 2, and savings are approximately four percent in wellfield No. 1. Acidization is beneficial for wells that can produce more than 500 gpm (32 lps), and is of marginal value for those that produce less than that amount. 相似文献
525.
LeVerne D. Hudson David J. Schaeffer William J. Tucker William H. Ettinger 《Environmental management》1978,2(6):555-559
During 1976, Illinois experienced a mild drought, of i ntensity equivalent to the once in 5 years frequency. It was anticipated that the drought would result in deteriorated water quality because dilution of point source discharges would be diminished. Furthermore, because productivity in Illinois streams is light limited, reduced runoff should result in clearer streams, higher algae levels, and greater variability in dissolved oxygen levels. In spite of these expectations, both chemical and biologic data showed that water quality in 1976 was appreciably better than that before 1975. The information provided by the Illinois water quality index (Janardan and Schaeffer 1977) coincides with biologic analyses of benthic invertebrates. The index supports and supplements the biologic data and provides a means for quantifying and integrating chemical and biologic data.The results of this study showed that the drought had little, if any, effect on statewide water quality. Although the magnitude of the drought varied across the state, water quality remained unchanged between 1975 and 1976. This may have reflected the ability of unpolluted systems to adjust to natural variations or have been an indication that there were offsetting statewide gains in pollution control in 1976 or that uncharacterized, broad-based phenomena were operating in stream ecology, or that combinations of these were in effect.Based on presentations before the American Water Resources Assocition, Illinois Section, Chicago, Illinois, June 10–11, 1977. 相似文献
526.
527.
David W. Zimmer Roger W. Bachmann 《Journal of the American Water Resources Association》1978,14(4):868-883
ABSTRACT: Habitat diversity and invertebrate drift were studied in a group of natural and channelized tributaries of the upper Des Moines River during 1974 and 1975. Channelized streams in this region had lower sinuosity index values than natural channel segments. There were significant (P=O.05) positive correlations between channel sinuosity and the variability of water depth and current velocity. Invertebrate drift density, expressed as biomass and total numbers, also was correlated with channel sinuosity. Channelization has decreased habitat variability and invertebrate drift density in streams of the upper Des Moines River Basin and probably has reduced the quantity of water stored in streams during periods of low flow. 相似文献
528.
David V. MacDonald Kline P. Barney Shelley F. Jones 《Journal of the American Water Resources Association》1977,13(3):583-598
ABSTRACT: This paper describes a method of analyzing the nonquantifiable parameters which should be considered in the evaluation of engineering alternatives. The nonquantifiable parameters can include environmental impact, feasibility of implementation, and performance. The method considers rating all the alternatives on the basis of a set of criteria which reflect these parameters. A procedure is discussed for obtaining review and guidance in the evaluation of engineering alternatives from the local elected officials or governing bodies and for obtaining the views and desires of the local communities. This is achieved through the formation of project review committees and an evaluation procedure which allows for the technical rating of alternatives by the engineer and the weighing of the evaluation criteria by the political and social groups. With the growing environmental concern and the high cost of engineering projects, the involvement of the public during the evaluation of engineering projects is becoming increasingly important to the final success of the project. 相似文献
529.
David M. Greer 《Environmental management》1982,6(3):217-229
An urban population of ducks in Puyallup, Washington, USA was studied for 14 consecutive months beginning in November 1978. Observations were made weekly from four study sites where ducks would congregate at early morning hours. Factors contributing to the presence of waterfowl in Puyallyup included abundant food supplies and a creek corridor that connected fragmented habitats in the urban area to the larger rural populations of waterfowl. Mallards (Anas platyrhynchos) were the most abundant of the 13 species observed and were the only ducks remaining during the nesting season. Habitat size and complexity were important factors influencing the species diversity of a particular site. Nesting success of mallards was poor due to limited distribution of nesting habitat, intraspecific aggression, and human disturbance. Both site-specific and more broad-based strategies are suggested for managing and planning for duck populations in urban areas. 相似文献
530.