全文获取类型
收费全文 | 21643篇 |
免费 | 223篇 |
国内免费 | 207篇 |
专业分类
安全科学 | 636篇 |
废物处理 | 980篇 |
环保管理 | 2862篇 |
综合类 | 2880篇 |
基础理论 | 5498篇 |
环境理论 | 8篇 |
污染及防治 | 6451篇 |
评价与监测 | 1524篇 |
社会与环境 | 1089篇 |
灾害及防治 | 145篇 |
出版年
2023年 | 125篇 |
2022年 | 271篇 |
2021年 | 287篇 |
2020年 | 166篇 |
2019年 | 199篇 |
2018年 | 384篇 |
2017年 | 371篇 |
2016年 | 589篇 |
2015年 | 460篇 |
2014年 | 711篇 |
2013年 | 1880篇 |
2012年 | 834篇 |
2011年 | 1032篇 |
2010年 | 776篇 |
2009年 | 876篇 |
2008年 | 1038篇 |
2007年 | 1060篇 |
2006年 | 942篇 |
2005年 | 779篇 |
2004年 | 772篇 |
2003年 | 703篇 |
2002年 | 705篇 |
2001年 | 801篇 |
2000年 | 578篇 |
1999年 | 329篇 |
1998年 | 252篇 |
1997年 | 233篇 |
1996年 | 284篇 |
1995年 | 282篇 |
1994年 | 272篇 |
1993年 | 235篇 |
1992年 | 210篇 |
1991年 | 193篇 |
1990年 | 214篇 |
1989年 | 192篇 |
1988年 | 185篇 |
1987年 | 172篇 |
1986年 | 152篇 |
1985年 | 151篇 |
1984年 | 179篇 |
1983年 | 180篇 |
1982年 | 168篇 |
1981年 | 171篇 |
1980年 | 137篇 |
1979年 | 161篇 |
1978年 | 111篇 |
1977年 | 102篇 |
1975年 | 96篇 |
1973年 | 94篇 |
1972年 | 100篇 |
排序方式: 共有10000条查询结果,搜索用时 796 毫秒
941.
D. C. Mccune Leonard H. Weinstein Jay S. Jacobson A. E. Hitchcock 《Journal of the Air & Waste Management Association (1995)》2013,63(11):465-468
Leaves of Tendergreen bean plants exposed to atmospheric fluoride concentrations in the range 1.7 to 7.6 μg/m3 showed increased levels of enolase and catalase activity and decreased levels of pyruvate and α-ketoglutarate. Phosphoenolpyruvate carboxylase activity and oxalacetate were not affected. The leaves of Milo maize plants exposed to 5.0 μg F/m3 showed increased levels of enolase and pyruvate kinase activity and a decreased level of pyruvate. Oxalacetate and α-ketoglutarate levels were not affected. Catalase activity was increased, then decreased by IIF fumigation. The changes induced by HF were greatest six to 10 days after the start of fumigation and disappeared or decreased in magnitude during the post-fumigation period. 相似文献
942.
C. E. Barthel JR. 《Journal of the Air & Waste Management Association (1995)》2013,63(11):475-478
This is a report on Meetings of Representatives of National Air Pollution Preventions Associations to Consider the Establishment of an International Union, held in Washington, D. C, June 18–19, 1964 and Houston, Texas, June 21–22, 1964. 相似文献
943.
944.
Marvin E. Miller George C. Holzworth 《Journal of the Air & Waste Management Association (1995)》2013,63(1):46-50
An urban diffusion model, which does not require the use of an electronic computer, is presented. The main simplifying assumptions are that continuous pollutant sources are uniformly distributed over the urban area and vertical diffusion occurs until the effluent from each line source reaches the top of the mixing layer, after which the effluent is uniformly distributed through the mixing layer. After the appropriate vertical diffusion coefficient is specified, the calculated concentration is a function of source strength, linear dimension of the metropolis, mixing depth, and wind speed. The calculated concentration is interpreted either as a representative maximum concentration or, through integration, as the average concentration over the metropolitan area. When a representative pollutant concentration is known, the model may be used to determine the apparent “uniform” source strength. 相似文献
945.
C. C. Shale 《Journal of the Air & Waste Management Association (1995)》2013,63(3):159-160
Current-voltage relationships for negative corona are given for a pilot-scale electrostatic precipitator with 3-in. electrode spacing at 80°–1500°F and 35–80 psig. Direct comparison is made with the electrical characteristics for a 1-in. spacing at 1200°F over the same pressure range. Experimental results on both spacing agree well with electrostatic theory. Initial dust removal efficiencies for the pilot-scale precipitator ranged from 90 to 98% at 1460°F and 80 psig, but continuous operation was not achieved owing to excessive thermal expansion of the internal parts of the unit. 相似文献
946.
J. B. Koogler R. S. Sholtes A. L. Danis C. I. Harding 《Journal of the Air & Waste Management Association (1995)》2013,63(4):211-214
In conjunction with a 15-month air quality survey of Jacksonville, Fia., a mathematical model has been developed to describe the dispersion of atmospheric pollutants. The source inventory used with the model was compiled, in part, from the data obtained from the sampling of all major sources within the area. The major sources were considered separately from the one-mile square area sources which accounted for the remainder of the emissions. Meteorological data was recorded continuously in the city including vertical temperature observations to 750 ft. The model was compiled in FORTRAN and can be used for both gaseous and particulate pollutants, by utilizing proper decay rates. The variant nature of meteorological parameters and emission rates are considered. The ground level concentrations of several pollutants which were determined for 24 hr periods at 11 sites and continuously at two other sites were used to check the model. A limited tracer study was carried out in conjunction with the project. 相似文献
947.
O. C. Taylor E. A. Cardiff J. D. Mersereau 《Journal of the Air & Waste Management Association (1995)》2013,63(4):171-173
A system has been developed to automatically measure the effects of air pollutants in the ambient air on the rate of CO2 exchange by intact leaves of citrus trees growing in the field. A miniaturized system utilizing the same nondispersive infrared CO2 analyzer has been designed to study individually the effects of different concentrations of air pollutants on photosynthesis and respiration by plants. 相似文献
948.
H. C. Wohlers M. Feldstein 《Journal of the Air & Waste Management Association (1995)》2013,63(5):226-229
The problem of an investigation of the need for a regulation on organic compound emissions in the San Francisco Bay Area can be divided into two major areas: 1. Is there a need for a regulation on organic compound emissions? What is the extent of photochemical smog effects? How much control is necessary to achieve the desired effects? 2. (2) If the need exists for an organic compound regulation, can a performance type regulation be written for all types of organic compound emissions? Must the regulation be directed toward specific industries or types of emissions? Can the regulation be adequately enforced—both practically and legally? This paper will describe the studies undertaken by the District Staff to answer the first set of questions. Work covering the second group of questions is now under investigation. 相似文献
949.
Jean P. Paré M.Sc 《Journal of the Air & Waste Management Association (1995)》2013,63(6):325-327
The lead acetate paper tape reagent method for the estimation of hydrogen sulfide in air has been reviewed with the conclusions that the colored spots on which the quantitative estimation is based are not stable and do not lend by themselves to accurate results. Although it may be retained for grab sampling work, the lead acetate paper tape reagent is not acceptable as a stoichiometric reagent in any case where long duration sampling periods are concerned like in air pollution studies. A new mercuric chloride paper tape reagent has been developed as a substitute. Due to the fact that the colored spots resulting from the action of hydrogen sulfide on mercuric chloride are sensitive and very stablet, this new paper tape reagent is proposed as an adequate and reliable analytical too for the estimation of hydrogen sulfide in air. Also, a more comprehensive application of the paper tape analytical system is proposed throughout a suitable control of the factor tape retention capacity vs sampling rate which imposes some restrictions in the selection of the practical working range of concentrations. Nevertheless this working range is still wide enough to encompass all the hydrogen sulfide concentrations normally encountered in the city atmosphere. 相似文献
950.
P. R. Miller J. R. Parmeter Jr. Brigitta H. Flick C. W. Martinez 《Journal of the Air & Waste Management Association (1995)》2013,63(6):435-438
Photochemical oxidant injury to ponderosa pine (Pinus ponderosa Laws) is a severe problem in the southern California mountains. Three-year-old ponderosa pines fumigated in controlled environment chambers with ozone at 0.15, 0.30, or 0.45 ppm had apparent photosynthesis rates reduced by 10, 70, and 85%, respectively, after 30 days exposure. A fumigation with 0.30 ppm ozone for 33 days depressed the cold perchloric acid extracted polysaccharides of both current and one-year-old needles by 40%. The 80% ethanol soluble sugar concentration of current year, ozone-injured needles increased 16% and that of the one-year-old needles decreased slightly. Both carbohydrate fractions of control trees in carbon-filtered air increased moderately. Higher, endogenous concentrations of ascorbic acid in needles did not protect the tissue from ozone injury. Apparent photosynthesis rate was a sensitive index for ozone dosage response. Needle carbohydrate depletion probably induces premature abscission. 相似文献