全文获取类型
收费全文 | 840篇 |
免费 | 2篇 |
国内免费 | 2篇 |
专业分类
安全科学 | 20篇 |
废物处理 | 53篇 |
环保管理 | 30篇 |
综合类 | 112篇 |
基础理论 | 168篇 |
环境理论 | 1篇 |
污染及防治 | 284篇 |
评价与监测 | 118篇 |
社会与环境 | 57篇 |
灾害及防治 | 1篇 |
出版年
2023年 | 8篇 |
2022年 | 24篇 |
2021年 | 19篇 |
2020年 | 7篇 |
2019年 | 19篇 |
2018年 | 31篇 |
2017年 | 28篇 |
2016年 | 46篇 |
2015年 | 23篇 |
2014年 | 50篇 |
2013年 | 105篇 |
2012年 | 49篇 |
2011年 | 67篇 |
2010年 | 45篇 |
2009年 | 39篇 |
2008年 | 26篇 |
2007年 | 35篇 |
2006年 | 32篇 |
2005年 | 18篇 |
2004年 | 14篇 |
2003年 | 12篇 |
2002年 | 11篇 |
2001年 | 8篇 |
2000年 | 10篇 |
1997年 | 5篇 |
1995年 | 4篇 |
1994年 | 3篇 |
1992年 | 3篇 |
1987年 | 3篇 |
1986年 | 3篇 |
1985年 | 2篇 |
1984年 | 2篇 |
1982年 | 4篇 |
1980年 | 2篇 |
1973年 | 2篇 |
1972年 | 3篇 |
1971年 | 2篇 |
1970年 | 7篇 |
1969年 | 3篇 |
1968年 | 2篇 |
1967年 | 4篇 |
1966年 | 3篇 |
1965年 | 2篇 |
1964年 | 2篇 |
1961年 | 2篇 |
1960年 | 5篇 |
1959年 | 7篇 |
1958年 | 12篇 |
1957年 | 5篇 |
1956年 | 7篇 |
排序方式: 共有844条查询结果,搜索用时 640 毫秒
601.
We demonstrate the antioxidant potential of humic acids in (green) polymer chemistry. Lignite humic acids and its sodium and
ammonium salts were mixed at different concentrations with polyvinyl alcohol and thermogravimetry was used to assess the influence
on the thermo-oxidative stability of resulted blends. Both protonized form and ammonium salt of humic acids caused increased
stability of investigated polymers in the studied concentration range (0.5–10% of humic acids in polymer). In contrast to
protonized form, the ammonium salt also showed moderating effect on polymer degradation kinetics. Sodium salts caused substantially
lower stabilizing effect and presence of 10% of humic matter caused even destabilization. In all cases, however, when the
degradation has already started, the presence of humic acids and its salts caused more intensive polymer decomposition, which
resulted in lower weight of char. 相似文献
602.
Tina Mesarič Kristina Sepčič Veronica Piazza Chiara Gambardella Francesca Garaventa Damjana Drobne 《Chemistry and Ecology》2013,29(7):643-652
The effects of two carbon-based nanomaterials, nano-sized carbon black (nCB), and single-layer graphene oxide (GO) on settlement of Amphibalanus amphitrite (Cirripedia, Crustacea) cypris larvae (cyprids) were assessed after 24, 48, and 72 h of exposure. Additionally, the effects of these nanomaterials on the mortality and swimming behaviour of the nauplius larvae (nauplii) of the same organism were determined after 24 and 48 h. The data indicate that nCB is more effective as a potential antisettlement agent than single-layer GO; moreover, nCB did not show any adverse effects on the larvae. The swimming behaviour of II stage nauplii of A. amphitrite exposed to a suspension of nCB was inhibited only at very high nCB concentrations (≥0.5 mg/mL). Single-layer GO, on the contrary, showed lower antisettlement effects and was more active in altering the survival and inhibiting the swimming behaviour of the nauplii. An indication of the toxic or non-toxic mechanisms of the antisettlement properties of both of these nanomaterials is provided by the reversibility of the antisettlement activity. In conclusion, we propose nCB as an innovative antifouling nanomaterial that shows low toxicity towards the model organism (crustaceans) used in this study. 相似文献
603.
Gürcan Güleryüz Ümran Seven Erdemir Hülya Arslan Ayşegül Akpinar Ayça Çiçek Şeref Güçer 《Chemistry and Ecology》2013,29(6):494-509
The aim of this study was to evaluate the effects of copper (Cu) stress on accumulation and transport of trace elements, nitrogen assimilation, and growth parameters of Verbascum olympicum. Eight-week-old seedlings were grown in Hoagland's solution and exposed to 0, 50, 250, or 500?µM CuSO4 for seven days in laboratory conditions. Bioaccumulation of trace elements (boron, bismuth, cobalt, Cu, iron, lithium, manganese, molybdenum, nickel, lead, zinc) in the roots and leaves was determined by inductively coupled plasma–mass spectrometry after one, three, and seven days. Chlorophyll content, nitrate reductase, and glutamine synthetase activities, soluble protein content, and biomass were determined. Copper accumulated in the roots and leaves (up to 19609.8 and 256.2?mg?kg?1 dry weight, respectively). Other trace elements accumulated to higher levels in the roots of Cu-treated plants compared with those of control plants. High Cu concentrations decreased nitrogen-assimilatory enzyme activities. Compared with control plants, those treated with high Cu concentrations showed lower chlorophyll contents, total protein contents, and biomass. Nitrogen assimilation and growth parameters of V. olympicum were negatively affected by Cu treatment but mineral nutrition was not severely disrupted. The results support the suitability of V. olympicum as a candidate for phytoremediation of Cu-contaminated soils. 相似文献
604.
Abstract INA‐Petrochemical Industry Omi?alj, Yugoslavia is currently producing low density polyethylene, vinyl chloride monomer and ethylene dichloride. Because of a potentially great hazard for environmental pollution, particularly by low molecular weight chlorinated hydrocarbons, the company has been putting significant effort into its anti‐pollution programme. Modern technology, polyfunctional organization and proper control of all waste materials has enabled, thus far, no evident or noticable impact on the environment. Wastewater treatment from the source to final discharged effluent and environmental control results are described. 相似文献
605.
The acidobasic and complexation properties of Humic acids 总被引:1,自引:0,他引:1
Complexation of Humic Acids (HA) of different origin, like Fluka, and especially those extracted from bohemian brown coal, with cadmium(II) and lead(II) was studied at pH 5.0 using differential pulse anodic stripping voltammetry. Conditions close to those present in the environment were chosen with 3‐ 10‐4 moll‐4 for HAs and 2. 10‐8‐l . 10‐5 moll‐1 for Cd(II) and Pb(II). Stability constants evaluation was done assuming the electrode process is diffusion controlled and the complexes are labile. Obtained log K values were in the range 4.49–5.25 for Cd(II) and as expected the higher log K values 6.05–6.60 were found for Pb(II). There was no significant difference between complexation properties of HA extracted from bohemian brown coal and that of Fluka. The results obtained are in good agreement with the literature and those obtained by ISE in our laboratory. 相似文献
606.
Groundwater pumping can reduce the flow of surface water in nearby streams. In the United States, recent awareness of this externality has led to intra- and inter-state conflict and rapidly-changing water management policies and institutions. Although the marginal damage of groundwater use on stream flows depends crucially on the location of pumping relative to streams, current regulations are generally uniform over space. We use a population data set of irrigation wells in the Nebraska portion of the Republican River Basin to analyze whether adopting spatially differentiated groundwater pumping regulations leads to significant reductions in farmer abatement costs and costs from damage to streams. We find that regulators can generate most of the potential savings in total social costs without accounting for spatial heterogeneity. However, if regulators need to increase the protection of streams significantly from current levels, spatially differentiated policies will yield sizable cost savings. 相似文献
607.
Haidi Arbanasić Martina Đuras Martina Podnar Tomislav Gomerčić Snježana Ćurković Ana Galov 《Marine Biology》2014,161(10):2407-2422
The bottlenose dolphin (Tursiops truncatus) is the most common cetacean species worldwide and the only marine mammal species resident in the Croatian part of the Adriatic Sea. To gain insight into genetic diversity of bottlenose dolphins at adaptively important loci relevant to conservation, we analysed the polymorphism of major histocompatibility complex (MHC) genes, which play a key role in pathogen confrontation and clearance. Specifically, we examined the diversity of MHC class II DRA, DQA and DQB alleles in 50 bottlenose dolphins from the Adriatic Sea collected between 1997 and 2011 and in 12 animals from other Mediterranean locations. Notable variation in DQA, DQB and three-locus haplotypes was found, with all 10 DQA and 12 DQB alleles encoding unique protein products. Analysis of the ratio of non-synonymous to synonymous substitution rates suggests that positive selection acts at both highly variable loci. Phylogenetic analyses revealed trans-species polymorphism at the DQB locus, strongly indicating the influence of balancing selection in the long term. In fact, the balancing selection observed in bottlenose dolphins is higher than that reported for most other cetaceans and comparable to that seen in terrestrial mammals. 相似文献
608.
K. Fajčíková V. Cvečková A. Stewart S. Rapant 《Environmental geochemistry and health》2014,36(5):973-986
We undertook a quantitative estimation of health risks to residents living in the Slovak Republic and exposed to contaminated groundwater (ingestion by adult population) and/or soils (ingestion by adult and child population). Potential risk areas were mapped to give a visual presentation at basic administrative units of the country (municipalities, districts, regions) for easy discussion with policy and decision-makers. The health risk estimates were calculated by US EPA methods, applying threshold values for chronic risk and non-threshold values for cancer risk. The potential health risk was evaluated for As, Ba, Cd, Cu, F, Hg, Mn, NO3 ?, Pb, Sb, Se and Zn for groundwater and As, B, Ba, Be, Cd, Cu, F, Hg, Mn, Mo, Ni, Pb, Sb, Se and Zn for soils. An increased health risk was identified mainly in historical mining areas highly contaminated by geogenic–anthropogenic sources (ore deposit occurrence, mining, metallurgy). Arsenic and antimony were the most significant elements in relation to health risks from groundwater and soil contamination in the Slovak Republic contributing a significant part of total chronic risk levels. Health risk estimation for soil contamination has highlighted the significance of exposure through soil ingestion in children. Increased cancer risks from groundwater and soil contamination by arsenic were noted in several municipalities and districts throughout the country in areas with significantly high arsenic levels in the environment. This approach to health risk estimations and visualization represents a fast, clear and convenient tool for delineation of risk areas at national and local levels. 相似文献
609.
610.
Nicola Tiso Jurgita Mikašauskaitė Mantas Stankevičius Vilija Snieškienė Antanina Stankevičienė Chiara Polcaro 《毒物与环境化学》2016,98(1):77-89
A group of 36 fungal strains, belonging to the Lithuanian mycobiota, was collected and isolated from different locations, habitats, and matrices, including creosote-treated wood in storage yards for crosstie wastes. The eight most perspective strains selected according to preliminary assessment of tolerance to coal tar were subsequently identified combining taxonomical evaluation and molecular techniques. The tolerance of the eight identified fungal species (five basidiomycetes and three ascomycetes) to the presence of various concentrations of coal tar, and for the four most perspective fungal strains (Pleurotus sp., Schizophyllum sp., Irpex lacteus, Bjerkandera adusta) to polycyclic aromatic hydrocarbons was evaluated. The ligninolytic enzymatic activity assay of the isolated strains resulted in a good correspondence between the tolerance to pollutants and the capability to produce ligninolytic enzymes indicating that this group of white-rot fungi is perspective for further investigation and eventual usage for mycoremediation of polycyclic aromatic hydrocarbons polluted substrates. 相似文献