全文获取类型
收费全文 | 6814篇 |
免费 | 476篇 |
国内免费 | 1225篇 |
专业分类
安全科学 | 345篇 |
废物处理 | 102篇 |
环保管理 | 1896篇 |
综合类 | 3563篇 |
基础理论 | 670篇 |
环境理论 | 1篇 |
污染及防治 | 402篇 |
评价与监测 | 1242篇 |
社会与环境 | 252篇 |
灾害及防治 | 42篇 |
出版年
2024年 | 42篇 |
2023年 | 122篇 |
2022年 | 162篇 |
2021年 | 196篇 |
2020年 | 206篇 |
2019年 | 173篇 |
2018年 | 176篇 |
2017年 | 247篇 |
2016年 | 299篇 |
2015年 | 307篇 |
2014年 | 380篇 |
2013年 | 454篇 |
2012年 | 469篇 |
2011年 | 499篇 |
2010年 | 352篇 |
2009年 | 381篇 |
2008年 | 309篇 |
2007年 | 446篇 |
2006年 | 418篇 |
2005年 | 317篇 |
2004年 | 271篇 |
2003年 | 293篇 |
2002年 | 265篇 |
2001年 | 207篇 |
2000年 | 206篇 |
1999年 | 162篇 |
1998年 | 128篇 |
1997年 | 117篇 |
1996年 | 123篇 |
1995年 | 96篇 |
1994年 | 87篇 |
1993年 | 61篇 |
1992年 | 49篇 |
1991年 | 57篇 |
1990年 | 25篇 |
1989年 | 30篇 |
1988年 | 36篇 |
1987年 | 30篇 |
1986年 | 24篇 |
1985年 | 20篇 |
1984年 | 23篇 |
1983年 | 22篇 |
1982年 | 27篇 |
1981年 | 27篇 |
1980年 | 31篇 |
1979年 | 29篇 |
1978年 | 18篇 |
1977年 | 15篇 |
1975年 | 15篇 |
1973年 | 18篇 |
排序方式: 共有8515条查询结果,搜索用时 437 毫秒
761.
Paired water samples were simultaneously activated from two different vertical positions within the approach section of a flow-control structure to determine the effect of sample intake position on nonpoint runoff parameter concentrations and subsequent event loads. Suspended solids (SS), total phosphorus (TP) and organic plus exchangeable nitrogen [(Or+Ex)-N] were consistently higher throughout each runoff event when sampled from the floor of the approach section as opposed to those samples taken at midstage. Dissolved molybdate reactive phosphorus (DMRP) and ammonium (NH4-N) concentrations did not appear to be significantly affected by the vertical difference in intake position. However, the nitrate plus nitrite nitrogen [(NO3+NO2)-N] concentrations were much higher when sampled from the midstage position.Although the concentration differences between the two methods were not appreciable, when evaluated in terms of event loads, discrepancies were evident for all parameters. Midstage sampling produced event loads for SS, TP, (Or + Ex)–N, DMRP, NH4-N, and (NO3+NO2)-N that were 44,39,35,80,71, and 181%, respectively, of floor sampling loads. Differences in loads between the two methods are attributed to the midstage position, sampling less of the bed load. The correct position will depend on the objective; however, such differences should be recognized during the design phase of the monitoring program.This work was supported by the Soil Science Department, College of Agriculture and Life Sciences, University of Wisconsin-Madison, and by the U.S. Environmental Protection Agency, Region V., Chicago, Illinois (Grant No. G005139-01). 相似文献
762.
Stefan E. Salbach R. Peter Dennis 《Journal of the American Water Resources Association》1980,16(4):621-626
ABSTRACT: The Ontario Ministry of the Environment has based its water quality management approach on a set of guidelines published in 1970. In light of the changing societal and economic background, advancement in technology and scientific knowledge, and philosophical attitudes towards water management, the water management program was recently revised. Factors influencing the revised approach, including federal-provincial interrelationships and international commitments under the Canada-U.S. Agreement, are summarized. The revised program consists of a goal statement, policies to implement this goal, revised water quality objectives, and detailed implementation procedures for field staff use. Rather than promulgating regulations to impose arbitrary effluent or receiving water standards on a province-wide basis, the revised approach involves the imposition of legally enforceable effluent requirements on a case-by-case basis. Although the paper emphasizes the surface water quality program, it also outlines the Ministry's goals, policies, and procedures for the management of surface-water quantity, as well as ground water quality and quantity. 相似文献
763.
ABSTRACT: Landsat radiance values were processed at two different (single and double) levels of accuracy to estimate chlorophyll a, turbidity, and suspended sediment in Lake Okeechobee, Florida. Both ordinary least square and ridge regression analyses were used to establish a relationship between water quality parameters and Landsat radiance. Radiance measurements made at greater precision (double level) gave a better solution in this application. The ridge regression analysis for double level not only can reduce the total mean square error about 13–20 percent and confidence interval about 6–28 percent as compared to ordinary least square analysis, but it can also change the interpretation of analysis results. 相似文献
764.
765.
ABSTRACT: Best management practices for irrigated agriculture are not restricted to the control of sediments in the return flow. Salts and nutrient loading and oxygen depletion are also of environmental concern. Since knowledge of waste loading returned from agricultural irrigation is limited, specific characterization of irrigatin and runoff water quality should precede corrective measures. In 1974, 1975 and 1976, four study sites with in a 50,000-acre irrigated area were monitored to characterize the quantity and quality of irrigation water and surface return flow. Simple correlatins among constituents showed strong relationships among BOD, TP, PO4,-P, and No3-N. Least significant difference tests among seasonal means of change-in-load per irrigation showed that only TDS and PO4-P were significant. 相似文献
766.
R. J. Brozka G. L. Rolfe L. E. Arnold 《Journal of the American Water Resources Association》1981,17(3):443-447
Two intermittent streams on oak-hickory watersheds in southern Illinois were gaged with a V-notched weir and sampled with an automatic water sampler. For three years data were collected on flow volume and water quality. Flow volumes show large variations between years and watersheds. Samples were analyzed for Na+, K+, Ca++, Mg++, P, and NO-3. Water quality was consistently high, although there were significant differences between watersheds. A baseline for water quality has been established for comparison after one of the watersheds is clearcut at a later date. 相似文献
767.
Albert N. Link Frank A. Scott 《Journal of the American Water Resources Association》1981,17(3):498-500
This paper reports the findings of a case study of the relative costs of a uniform standards system and an effluent fee system of water quality control. A 30-mile stretch of the Black Warrior River in Alabama is considered. The analysis demonstrates that the dischargers could reduce total pollution abatement costs by 33 percent under the suggested effluent fee system. 相似文献
768.
William Whipple Joseph V. Hunter 《Journal of the American Water Resources Association》1981,17(4):678-683
: The modeling of dissolved oxygen in streams is a widely used technique, upon which a great deal of money has been spent. This paper concludes that the standard methods of DO modeling by computer are unnecessarily complex, and that for some purposes, they can be replaced without loss of accuracy by desk top BOD models. Taking as an example, a set of data used in DO modeling, it is shown (a) that the data are grossly inconsistent, (b) that simultaneous gathering of data introduces errors in streams of long travel time, (c) that much more data as to pollutant concentrations should have been obtained, and (d) that 24-hour DO data could have been dispensed with. 相似文献
769.
Michael Donovan Charles A. Job William C. Sonzogni 《Journal of the American Water Resources Association》1981,17(1):23-28
ABSTRACT: The Illinois v. Milwaukee Federal District Court decision is the most far reaching application yet of the federal common law of nuisance to interstate water pollution conflicts. Although a Federal Appelate Court recently rescinded part of the district court decision, Milwaukee must still upgrade its metropolitan sewage system to a level beyond that required by federal and state regulations. The improvements must be completed with or without federal aid. The case points out the apparent inability of the Clean Water Act, the most comprehensive federal legislation affecting the nation's water quality, to deal with certain interstate water quality conflicts. The Milwaukee decision could set a precedent for similar settlements elsewhere which may in turn affect the U.S. Environmental Protection Agency's water quality clean up program. A more integrated, ecosystem conscious approach to management of shared water resources (e.g., the Great Lakes) would help reduce the need for court decisions like Illinois v. Milwaukee. 相似文献
770.
Donald J. Epp C. Edwin Young 《Journal of the American Water Resources Association》1981,17(2):215-224
ABSTRACT: Varying treatment levels to meet seasonal variation in assimilative capacity of streams can reduce total costs of treatment. A mathematical model of a Pennsylvania stream based on a theoretically sound approximation of the physical relationships underlying the distribution of DO in a river system was used to determine discharge constraints for an economic optimization model which produced estimates of sewage treatment cost savings. Increasing the number of flow periods during the year enhances cost reducing opportunities even when land application processes are considered. Also, the least cost treatment process for year around operation may not be the least costly under multiple flow period management. 相似文献