全文获取类型
收费全文 | 4513篇 |
免费 | 140篇 |
国内免费 | 275篇 |
专业分类
安全科学 | 314篇 |
废物处理 | 104篇 |
环保管理 | 915篇 |
综合类 | 2047篇 |
基础理论 | 347篇 |
污染及防治 | 391篇 |
评价与监测 | 650篇 |
社会与环境 | 115篇 |
灾害及防治 | 45篇 |
出版年
2024年 | 4篇 |
2023年 | 49篇 |
2022年 | 57篇 |
2021年 | 81篇 |
2020年 | 115篇 |
2019年 | 65篇 |
2018年 | 64篇 |
2017年 | 94篇 |
2016年 | 126篇 |
2015年 | 132篇 |
2014年 | 226篇 |
2013年 | 277篇 |
2012年 | 250篇 |
2011年 | 302篇 |
2010年 | 173篇 |
2009年 | 298篇 |
2008年 | 303篇 |
2007年 | 386篇 |
2006年 | 294篇 |
2005年 | 205篇 |
2004年 | 151篇 |
2003年 | 167篇 |
2002年 | 143篇 |
2001年 | 120篇 |
2000年 | 119篇 |
1999年 | 148篇 |
1998年 | 111篇 |
1997年 | 65篇 |
1996年 | 48篇 |
1995年 | 72篇 |
1994年 | 67篇 |
1993年 | 48篇 |
1992年 | 29篇 |
1991年 | 21篇 |
1990年 | 11篇 |
1989年 | 7篇 |
1988年 | 12篇 |
1987年 | 7篇 |
1986年 | 12篇 |
1985年 | 9篇 |
1984年 | 6篇 |
1983年 | 3篇 |
1982年 | 7篇 |
1981年 | 5篇 |
1980年 | 7篇 |
1979年 | 9篇 |
1978年 | 6篇 |
1973年 | 5篇 |
1969年 | 2篇 |
1968年 | 2篇 |
排序方式: 共有4928条查询结果,搜索用时 410 毫秒
721.
Zhuoying WU Qing WANG Feng GUO Shenghua ZHANG Qipei JIANG Xin YU 《Frontiers of Environmental Science & Engineering》2014,8(2):205-214
Often as a result ofbiofilm formation, drinking water distribution systems (DWDS) are regularly faced with the problem of microbial contamination. Quorum sensing (QS) systems play a marked role in the regulation of microbial biofilm formation; thus, inhibition of QS systems may provide a promising approach to biofilm formation control in DWDS. In the present study, 22 bacterial strains were isolated from drinking water-related environments. The following properties of the strains were investigated: bacterial biofilm formation capacity, QS signal molecule N-acyl-L-homoserine lactones (AHLs) production ability, and responses to AHLs and AHL analogs, 3-chloro-4-(dichloromethyl)-5-hydroxy-2(5H)- furanone (MX) and 2(5H)-furanone. Four AHLs were added to developed biofilms at dosages ranging from 0.1 nmol.L J to 100nmol.L1. As a result, the biofilm growth of more than 1/4 of the isolates, which included AHL producers and non-producers, were significantly promoted. Further, the biofilm biomasses were closely associated with respective AHLs concentrations. These results provided evidence to support the idea that AHLs play a definitive role in biofilm formation in many of the studied bacteria. Meanwhile, two AHLs analogs demon- strated unexpectedly minimal negative effects on biofilm formation. This suggested that, in order to find an applicable QS inhibition approach for biofilm control in DWDS, the testing and analysis of more analogs is needed. 相似文献
722.
Many substances react with water in such a way that flammable gases are formed. For transport issues this reaction may possess a considerable hazard especially if the cargo is wetted by rain or by water from other sources. In the UN Recommendations on the Transport of Dangerous Goods these kinds of problems are addressed. The UN test N.5 “Test method for substances which in contact with water emit flammable gases” corresponds to this hazard. Classification according to the test method is done by measurement of the gas evolution rate of the flammable gas by any suitable procedure. At BAM a gravimetric approach is used to measure the gas evolution rate. In this paper we present the evaluation of the apparatus by means of an absolute calibration routine utilizing a reaction where a known amount of gas is produced as well as the evaluation of important parameters influencing the gas evolution rate using different substances. It can be shown that the apparatus is capable of measuring absolute gas volumes as low as 6 mL with an acceptable error of about 17% as determined from the reaction of Mg with demineralized water. 相似文献
723.
724.
725.
726.
In this work, a new procedure for the enrichment of the trace amount of Cu2+, Ni2+, Co2+, Pb2+, Fe2+, and Zn2+ ions based on the utilization of multiwalled carbon nanotubes (MWCNT) modified with 2-(2-hydroxy-5-nitrophenyl)-4,5-diphenyl imidazole as chelating agent prior to their determination by flame atomic absorption spectrometry has been described. The influence of effective parameters including pH, amount of ligand and MWCNT, composition of eluent, and coexisting ions on recoveries of understudy metal ions was examined. At the optimum pH of 5.0, all metal ions were quantitatively sorbed onto the proposed solid phase and completely desorbed with 8?mL of 5.0?mol?L?1 HNO3. The detection limit of Cu2+, Co2+, Ni2+, Pb2+, Fe2+, and Zn2+ ions was 1.7, 2.4, 2.3, 2.9, 2.8, and 1.4?µg?L?1, while the preconcentration factor was 63 for Cu2+ and 94 for the other metal ions and relative standard deviations between 1.8 less than 3.0%. The proposed procedure was applied for the analysis of various samples. 相似文献
727.
In this study a double model algorithm is developed for the simulation of the vertical profiles of monthly values of absolute humidity. The thrust of the algorithm is that is depends on the use of ground measurements for humidity and is based upon the use of two model relations for altitudes above and below 1 Km respectively. Monthly absolute humidity profiles as estimated using the specially constructed double model algorithm compare well with those calculated with the use of radiosonde data for the time period 1980–1990 (Helliniko station, Southern Greece). In particular the model estimation is very satisfactory at altitudes above the Planetary Boundary Layer and rather satisfying at altitudes below 1 Km. This implies that the model algorithm may be useful in supporting climatological studies in areas where lack of relevant information on the vertical distribution of water vapour is recognised. 相似文献
728.
The total organic halogen (TOX) pollution in the highly polluted Ayase River system was investigated. Using the concentration of coexisting linear undecylbenzenesulfonate and the difference in the flowing water volume between summer and winter, the fractions of domestic and agricultural wastewaters in the whole water column were calculated and the variety of the TOX sources in the river was estimated. The river carried about 100 kgCl of TOX materials in one day; about 50 kgCl of the materials was from residential area in the basin. The contribution of agricultural drainage from paddy field was not negligible in summer. Highly contribution of industrial wastewater was observed in a tributary Furuayase River basin while the amount of TOX loaded in the area was widely varied; 0–105 kgCl of the materials was discharged as industrial wastewater. 相似文献
729.
O. Solaun J. G. Rodríguez A. Borja J. Franco J. Larreta V. Valencia 《Chemistry and Ecology》2013,29(1):11-27
Background levels of metals (Ag, Cd, Cu, Cr, Hg, Ni, Pb and Zn) in biomonitors (Mytilus galloprovincialis mussels and Crassostrea gigas oysters), in estuarine waters within the Basque Country (south-east Bay of Biscay) are estimated using non-parametric statistical tools and data are presented graphically, with the aim of being used in assessing the ecological status, within the European Water Framework Directive (WFD). The basis for this study was the statistical analysis of data compiled from monitoring programmes undertaken along the Basque coast, between 1990 and 2008. For this analysis, a heuristic method was adapted and used. Results showed different metal background ranges throughout the year for both mussels and oysters. Values corresponding to the upper limit of the background range (i.e. value of the upper whisker of the box-plot) are proposed as the ‘high/good’ status boundary, according to the WFD. 相似文献
730.
Abstract Kingston Harbour has been experiencing increased levels of organic pollution since initial ecological assessments in 1971. to develop a new baseline of eutrophication in the Harbour 20 years later, and determine the most appropriate indices to be used in the continued monitoring the area, the water quality of Kingston Harbour was reassessed between December 1992 and 1993, by contemporaneous sampling of traditional water column parameters and planktonic communities at 28 stations within the Harbour. Indices used for water quality assessment were temperature, salinity, light penetration, dissolved oxygen, BOD and nutrients (nitrates-N, phosphate-P and ammonia-N). Results indicated that the planktonic community provided the most reliable index of increased eutrophication and changes in water quality. While physical variables indicated little change in Harbour waters and chemical variables indicated significant but erratic changes, the planktonic community displayed the classic characteristics of eutrophication. Phytoplankton biomass (a maximum of 148 mg m?3 chlorophyll a) was 5 to 10 times greater than in 1971 while zooplankton abundances (maximum of 80,000 animals m?3) were 4 times greater. in both cases the community composition had altered and there were fewer taxa than previously found. 相似文献