全文获取类型
收费全文 | 3789篇 |
免费 | 152篇 |
国内免费 | 225篇 |
专业分类
安全科学 | 238篇 |
废物处理 | 30篇 |
环保管理 | 1073篇 |
综合类 | 1445篇 |
基础理论 | 241篇 |
环境理论 | 1篇 |
污染及防治 | 293篇 |
评价与监测 | 589篇 |
社会与环境 | 191篇 |
灾害及防治 | 65篇 |
出版年
2023年 | 53篇 |
2022年 | 55篇 |
2021年 | 90篇 |
2020年 | 127篇 |
2019年 | 74篇 |
2018年 | 75篇 |
2017年 | 108篇 |
2016年 | 138篇 |
2015年 | 140篇 |
2014年 | 163篇 |
2013年 | 205篇 |
2012年 | 175篇 |
2011年 | 292篇 |
2010年 | 116篇 |
2009年 | 247篇 |
2008年 | 233篇 |
2007年 | 233篇 |
2006年 | 192篇 |
2005年 | 146篇 |
2004年 | 130篇 |
2003年 | 141篇 |
2002年 | 116篇 |
2001年 | 101篇 |
2000年 | 94篇 |
1999年 | 91篇 |
1998年 | 86篇 |
1997年 | 67篇 |
1996年 | 46篇 |
1995年 | 59篇 |
1994年 | 70篇 |
1993年 | 45篇 |
1992年 | 28篇 |
1991年 | 26篇 |
1990年 | 13篇 |
1989年 | 17篇 |
1988年 | 15篇 |
1987年 | 9篇 |
1986年 | 14篇 |
1985年 | 11篇 |
1984年 | 9篇 |
1983年 | 8篇 |
1982年 | 10篇 |
1981年 | 11篇 |
1980年 | 13篇 |
1979年 | 15篇 |
1978年 | 9篇 |
1976年 | 5篇 |
1973年 | 8篇 |
1972年 | 5篇 |
1971年 | 10篇 |
排序方式: 共有4166条查询结果,搜索用时 937 毫秒
601.
现今,我国水环境整体情况仍不容乐观,相较于大气污染而言,水污染形势也更为严峻紧迫。水环境关乎着人们的切身利益,与居民的健康和社会稳定紧密勾连,相关的新闻也深刻地反映着社会大众关注的焦点与痛点。拟从获取的数据入手,对以“长江水污染”为议题的新闻报道进行系统地研究分析,从而探讨当前水环境污染新闻报道的潜在问题,并对此提出一些对策与建议。厘清水环境污染新闻报道的现状,把握水环境污染报道存在的问题,对于新闻报道发挥影响力和推动水污染问题的解决具有重要意义。 相似文献
602.
603.
障碍物影响下细水雾灭火有效性的研究具有重要的意义。研究了障碍物与火焰的相对位置、细水雾工作压力、喷头距离火焰垂直距离及水平距离等因素对灭火有效性的影响,以及细水雾作用下火灾烟气中一氧化碳、二氧化碳及氧气浓度的变化规律等。结果表明:高压细水雾可以有效扑救部分有障碍物遮挡的油池火,同时喷头距离火焰的水平距离和垂直距离也显著影响着细水雾的灭火速度;高压细水雾在灭火过程中火场的氧气浓度明显升高,二氧化碳和一氧化碳浓度明显降低;细水雾工作压力较低时,一氧化碳浓度反而有所增加。 相似文献
604.
Iratxe Menchaca José Germán Rodríguez Ángel Borja María Jesús Belzunce-Segarra Javier Franco Joxe Mikel Garmendia 《Chemistry and Ecology》2014,30(8):693-700
Marine regional Sediment Quality Guidelines (SQG) for polychlorinated biphenyls (PCB) and polycyclic aromatic hydrocarbons (PAH) from the Basque coast (SE Bay of Biscay) were determined, on the basis of sediment chemistry, toxicity and benthic community disturbance from analysis of 756 estuarine and coastal samples. The SQG were calculated using a percentile approach (based upon effect and non-effect data), using non-normalised and normalised concentration, by total organic carbon. However, normalisation by total organic carbon did not result in any improvement in accuracy compared with non-normalised values. Hence, this study proposes non-normalised SQG values for assessment of the chemical and physicochemical status in marine waters in the Basque Country, within the Water Framework Directive: 24.6–29 μg kg?1 for total PCBs; 164–285 μg kg?1 for low molecular weight PAH; 922–1537 μg kg?1 for high molecular weight PAH; and 1607–2617 μg kg?1 for total PAH. 相似文献
605.
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
606.
607.
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
608.
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
609.
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
610.
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