全文获取类型
收费全文 | 224篇 |
免费 | 1篇 |
国内免费 | 2篇 |
专业分类
安全科学 | 7篇 |
废物处理 | 8篇 |
环保管理 | 5篇 |
综合类 | 87篇 |
基础理论 | 60篇 |
环境理论 | 1篇 |
污染及防治 | 50篇 |
评价与监测 | 5篇 |
社会与环境 | 4篇 |
出版年
2021年 | 3篇 |
2016年 | 2篇 |
2013年 | 9篇 |
2012年 | 13篇 |
2011年 | 5篇 |
2010年 | 7篇 |
2009年 | 4篇 |
2008年 | 2篇 |
2007年 | 13篇 |
2006年 | 6篇 |
2005年 | 2篇 |
2004年 | 3篇 |
2003年 | 7篇 |
2002年 | 4篇 |
2001年 | 8篇 |
2000年 | 13篇 |
1999年 | 4篇 |
1998年 | 4篇 |
1997年 | 6篇 |
1996年 | 6篇 |
1995年 | 6篇 |
1994年 | 6篇 |
1993年 | 7篇 |
1992年 | 5篇 |
1991年 | 3篇 |
1990年 | 9篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1985年 | 1篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1981年 | 2篇 |
1979年 | 3篇 |
1972年 | 2篇 |
1970年 | 2篇 |
1969年 | 3篇 |
1968年 | 2篇 |
1967年 | 2篇 |
1966年 | 5篇 |
1965年 | 4篇 |
1964年 | 3篇 |
1963年 | 4篇 |
1962年 | 4篇 |
1961年 | 2篇 |
1960年 | 7篇 |
1959年 | 4篇 |
1958年 | 2篇 |
1957年 | 2篇 |
1955年 | 5篇 |
1954年 | 1篇 |
排序方式: 共有227条查询结果,搜索用时 0 毫秒
221.
222.
Niu J Chen J Martens D Quan X Yang F Kettrup A Schramm KW 《Environmental pollution (Barking, Essex : 1987)》2003,123(1):39-45
Photolysis of polycyclic aromatic hydrocarbons (PAHs) sorbed on surfaces of spruce [Picea abies (L.) Karst.] needles under sunlight irradiation was investigated. PAHs were produced by combustion of polyvinyl chloride (PVC), wood, high-density polyethylene (HDPE), and styrene in a stove. The factors of sunlight irradiation on the surfaces of spruce needles were taken into consideration when investigating the kinetic parameters. The photolysis of the 18 PAHs under study follows first-order kinetics. The photolysis half-lives range from 15 h for dibenzo(a,h)anthracene to 75 h for phenanthrene. Photolysis of some PAHs on surfaces of spruce needles may play an important role on the fate of PAHs in the environment. 相似文献
223.
The residues of 31 chlorinated hydrocarbons (CHCs), 25 chlorophenols (CPs), 30 organophosphorus (OP) and pyrethroid (PRT)
in two arable soils from the semi-arid and subtropical regions of China were assessed. Data obtained indicate that the main
compounds of CHC pesticide residues in the semi-arid soil were 4,4′-DDE (25.3 ng/g) and β-HCH (14.1 ng/g), which totally accounted
to about 90% of total CHC residues detected. The total content of CHC residues detected in the subtropical soil was only 3.1
ng/g, of which approximately 50% was β-HCH. However, the total content of CP residues in both of the soils was about 11 ng/g.
In the semi-arid soil, only parathion-methyl amongst the 30 compounds of OP and PRT residues was detected (32.5 ng/g), whilst
malathion and parathion-methyl (8.7 and 17.7 ng/g, respectively) detected in the subtropical soil. Based on these results,
it was suggested the environmental risk of pesticide residues ranked in an order as CHCs (mainly as 4,4′-DDE, β-HCH) > OP
(parathion-methyl) > CPs for the semi-arid soil, and as OPs (parathion-methyl and malathion) > CPs > CHCs (β-HCH) for the
subtropical soil. 相似文献
224.
The accumulation of chlorinated biphenyls in
shows a tendency to increase with decreasing water solubility. The depuration times of PCBs from daphnia depend on the temperature of the test water and possibly on the water solubility of the substance. The water solubilities of 2,2′-dichlorobiphenyl, 2,5,4′-trichlorobiphenyl, 2,4,6,2′-tetrachlorobiphenyl and 2,4,6,2′,4′-pentachlorobiphenyl have been determined using 14C-labelled substances. 相似文献
225.
Horst Behrendt Matthias Kornmilch Dieter Opitz Oliver Schmoll Gaby Scholz 《Regional Environmental Change》2002,3(1-3):107-117
The nutrient discharges from point and diffuse sources in more than 200 German river basins were estimated for the periods
1983–1987 and 1993–1997 employing the MONERIS model. This model distinguishes between six diffuse pathways and point source
emissions from waste water treatment plants and direct industrial discharges. It was estimated that the total nitrogen input
into the German river systems amounts to about 819,000 t N year–1 in the period 1993 to 1997. These emissions have decreased since the mid-eighties by about 266,000 t N year–1, mainly caused by the reduction of point discharges. For phosphorus the emissions have been reduced by 56,290 t P year–1 and amount to 37,250 t P year–1 in the period 1993–1997. Based on emission data a retention module estimates riverine nutrient loads. The comparison of the
model output with the observed loads shows a deviation as low as 30% and 50% for nitrogen and phosphorus, respectively. The
regional resolution of the model indicates the relative importance of different pathways for phosphorus and nitrogen input
into river systems.
Electronic Publication 相似文献
226.
Dieter Gallwitz 《Die Naturwissenschaften》1981,68(4):163-169
The paper gives a short review of biochemical and genetic analyses of the eukaryotic cell cycle and cell division. Emphasis is placed on the interrelationship of macromolecular syntheses during chromosome replication, the possible involvement of protein phosphorylation in chromosome condensation, the function of contractile proteins in mitosis and cytokinesis and on mechanisms which trigger cell proliferation. 相似文献
227.
Bamboo in climate change and rural livelihoods 总被引:1,自引:0,他引:1
Maxim Lobovikov Dieter Schoene Lou Yping 《Mitigation and Adaptation Strategies for Global Change》2012,17(3):261-276
Climate change negotiations, assessments, and greenhouse gas inventory guidelines have all but bypassed bamboo. Disallowing
stands of tree-like bamboos as forests disparages their function in the carbon (C) cycle, and disregards pillars of smallholder
livelihoods. Exposing bamboo not as a panacea, but as an overlooked option for C conservation, sequestration, and adaptation,
we screen details of distribution, morphology, growth, physiology, and impacts for pertinence to climate change. Additional
to 40 million hectares of existing bamboo forests, many potential host countries for C projects harbor suitable sites. Definitions,
methods and default values, such as the root/shoot- ratio, biomass conversion factors, allometric equations and sampling variables
need adjusting. Rapid maturation, persistent rhizomes, a rich palette of species, and wind-firmness may mitigate risk. Bamboos
can accommodate agro-and urban forestry, and reign in unsustainable shifting cultivation. Distribution functions of bamboo
biomass stocks and growths do not deviate drastically from those of trees. If anything, bamboo stocks are slightly lower,
and growths slightly higher, with medians of 87 t*ha−1 and 10.5 t*ha−1*yr−1, respectively. However, bamboo’s outstanding socio-economic effects might well determine its future in mitigation and adaptation.
Early, continuous yields, selective harvesting on even small parcels of land, low capital and high labor intensity, virtually
100% conversion efficiency to about 1,500 products, and, typically, 75% of economic returns benefiting rural people are advantageous
attributes. Regional studies on suitability, silviculture, yields, economics, risk, and C assessment would strengthen bamboo’s
function as ‘the poor man’s timber’ and promote its niche as the smallholder’s C sink. 相似文献