全文获取类型
收费全文 | 125篇 |
免费 | 0篇 |
国内免费 | 4篇 |
专业分类
安全科学 | 1篇 |
废物处理 | 6篇 |
环保管理 | 5篇 |
综合类 | 18篇 |
基础理论 | 24篇 |
污染及防治 | 49篇 |
评价与监测 | 21篇 |
社会与环境 | 5篇 |
出版年
2023年 | 8篇 |
2022年 | 13篇 |
2021年 | 9篇 |
2019年 | 2篇 |
2018年 | 3篇 |
2017年 | 4篇 |
2016年 | 5篇 |
2015年 | 4篇 |
2014年 | 7篇 |
2013年 | 11篇 |
2012年 | 3篇 |
2011年 | 1篇 |
2010年 | 10篇 |
2009年 | 5篇 |
2008年 | 6篇 |
2007年 | 5篇 |
2006年 | 6篇 |
2005年 | 1篇 |
2004年 | 5篇 |
2003年 | 4篇 |
2002年 | 5篇 |
2000年 | 1篇 |
1995年 | 1篇 |
1989年 | 1篇 |
1984年 | 1篇 |
1983年 | 2篇 |
1980年 | 2篇 |
1968年 | 1篇 |
1964年 | 1篇 |
1957年 | 1篇 |
1954年 | 1篇 |
排序方式: 共有129条查询结果,搜索用时 15 毫秒
31.
The enhanced concentration of methane (CH4) in the atmosphere is significantly responsible for the ominous threat of global warming. Rice (Oryza) paddies are one of the largest anthropogenic sources of atmospheric CH4. Abatement strategies for mitigating CH4 emissions from rice fields offer an avenue to reduce the global atmospheric burden of methane and hence the associated menace of climate change. Projections on population growth suggest that world rice production must increase to meet the population’s food energy demand. In this scenario, those mitigation options are advocated which address both the objectives of methane mitigation and increased production of rice simultaneously. In this paper, we have formulated a nonlinear mathematical model to investigate the effectiveness and limitations of such options in reducing and stabilizing the atmospheric concentration of CH4 while increasing rice yield. In modeling process, it is assumed that implementation rate of mitigation options is proportional to the enhanced concentration of atmospheric CH4 due to rice fields. Model analysis reveals that implementation of mitigation options not always provides “win-win” outcome. Conditions under which these options reduce and stabilize CH4 emission from rice fields have been derived. These conditions are useful in devising strategies for effective abatement of CH4 emission from rice fields along with sustainable increase in rice yield. The analysis also shows that CH4 abatement highly depends on efficiencies of mitigation options to mitigate CH4 emission and improve rice production as well as on the implementation rate of mitigation options. Numerical simulation is carried out to verify theoretical findings. 相似文献
32.
Oral administration of arsenic trioxide(3 and 6 mg/kg body weight/d) for 30 d caused, as compared with vehicle control, dose-dependent significant reductions in body weight, absolute weight, protein, glycogen, as well as, total, dehydro and reduced ascorbic acid contents both in the liver and kidney of arsenic-treated mice. Succinic dehydrogenase(SDH) and phosphorylase only in the liver activities were significantly reduced in a dose-dependent manner. Acid phosphatase activity was significantly decreased in the liver of low dose arsenic-treated animals;however, significant rise in its activity was observed in high dose group. As compared with vehicle control, treatment also caused significant dose-dependent reductions in SDH, alkaline phosphatase and acid phosphatase activities in the kidney of mice. Vitamin E cotreatment as well as, 30 d withdrawal of arsenic trioxide treatment with or without vitamin E caused significant amelioration in arsenic-induced toxicity in mice. Administration of vitamin E during withdrawal of treatment also caused significant amelioration as compared from only withdrawal of the treatment. It is concluded that vitamin E ameliorates arsenic-induced toxicities in the liver and kidney of mice. 相似文献
33.
Kusin Faradiella Mohd Hasan Sharifah Nur Munirah Syed Molahid Verma Loretta M. Yusuff Ferdaus Mohamat Jusop Shamsuddin 《Environmental science and pollution research international》2023,30(9):22188-22210
Environmental Science and Pollution Research - Mining waste that is rich in iron-, calcium- and magnesium-bearing minerals can be a potential feedstock for sequestering CO2 by mineral carbonation.... 相似文献
34.
Kumar Santosh Verma Arunima Kumar Singh Shivesh Pratap Awasthi Abhishek 《Environmental science and pollution research international》2023,30(10):25325-25343
Environmental Science and Pollution Research - At present, food security is a matter of debate of global magnitude and fulfilling the feeding requirement of?>?8 billion human... 相似文献
35.
Subhasis Biswas Vishal Verma James J. Schauer Constantinos Sioutas 《Atmospheric environment (Oxford, England : 1994)》2009,43(11):1917-1925
Four heavy-duty diesel vehicles (HDDVs) in six retrofitted configurations (CRT®, V-SCRT®, Z-SCRT®, Horizon, DPX and CCRT®) and a baseline vehicle operating without after--treatment were tested under cruise (50 mph), transient UDDS and idle driving modes. As a continuation of the work by Biswas et al. [Biswas, S., Hu, S., Verma, V., Herner, J., Robertson, W.J., Ayala, A., Sioutas, C., 2008. Physical properties of particulate matter (PM) from late model heavy-duty diesel vehicles operating with advanced emission control technologies. Atmospheric Environment 42, 5622–5634.] on particle physical parameters, this paper focuses on PM chemical characteristics (Total carbon [TC], Elemental carbon [EC], Organic Carbon [OC], ions and water-soluble organic carbon [WSOC]) for cruise and UDDS cycles only. Size-resolved PM collected by MOUDI–Nano-MOUDI was analyzed for TC, EC and OC and ions (such as sulfate, nitrate, ammonium, potassium, sodium and phosphate), while Teflon coated glass fiber filters from a high volume sampler were extracted to determine WSOC. The introduction of retrofits reduced PM mass emissions over 90% in cruise and 95% in UDDS. Similarly, significant reductions in the emission of major chemical constituents (TC, OC and EC) were achieved. Sulfate dominated PM composition in vehicle configurations (V-SCRT®-UDDS, Z-SCRT®-Cruise, CRT® and DPX) with considerable nucleation mode and TC was predominant for configurations with less (Z-SCRT®-UDDS) or insignificant (CCRT®, Horizon) nucleation. The transient operation increases EC emissions, consistent with its higher accumulation PM mode content. In general, solubility of organic carbon is higher (average ~5 times) for retrofitted vehicles than the baseline vehicle. The retrofitted vehicles with catalyzed filters (DPX, CCRT®) had decreased OC solubility (WSOC/OC: 8–25%) unlike those with uncatalyzed filters (SCRT®s, Horizon; WSOC/OC ~ 60–100%). Ammonium was present predominantly in the nucleation mode, indicating that ternary nucleation may be the responsible mechanism for formation of these particles. 相似文献
36.
Parashar C Verma N Dixit S Shrivastava R 《Environmental monitoring and assessment》2008,140(1-3):119-122
Pollution of water bodies is one of the areas of major concern to environmentalists. Water quality is an index of health and
well being of a society. Industrialization, urbanization and modern agriculture practices have direct impact on the water
resources. These factors influence the water resources quantitatively and qualitatively. The study area selected were the
Upper lake and Kolar reservoir of Bhopal, the state capital of Madhya Pradesh, India. The Upper lake and Kolar reservoir both
are the important sources of potable water supply for the Bhopal city. The physico–chemical parameters like temperature, pH,
turbidity, total hardness, alkalinity, BOD, COD, Chloride, nitrate and phosphate were studied to ascertain the drinking water
quality. 相似文献
37.
An experiment was conducted to assess the role of different concentrations of dicyandiamide (DCD), a potent nitrification
inhibitor, on temporal changes in nitrous oxide emission from sandy loam agricultural soil. It was found that with increasing
concentration of DCD i.e. from 6 to 12% of nitrogen applied in the form of urea, there was a decrease in the both average
and peak N2O emissions. However, from 14% DCD treated soil, there was a non-significant alteration in the N2O emission. Maximum average N2O efflux of 217.55 μg m−2 h−1 was noted from control plots. As compared to control, there was an attenuation of 50, 58, 65, and 91% average N2O efflux from 6, 8, 10 and 12% DCD applied pots, respectively, whereas, there was a negative average of N2O efflux from the soil with 14% DCD treatment. The soil N content also showed a significant correlation with N2O emission. Therefore, 12% DCD treatment has been found to be the best with regard to attenuation of nitrous oxide from sandy
loam agricultural soils. 相似文献
38.
There is an evidence that benzyl alcohols may exhibit toxicity via a radical mechanism. To test this possibility, we studied the toxicity of para substituted benzyl alcohols on rapidly dividing cancer cells (L1210 leukemia). This system has previously found utility in studying the apparent radical toxicity of a variety of phenols. However, no evidence could be found for an electronic effect and the cellular toxicity was associated primarily with hydrophobicity. Comparison of this quantitative structure-activity relationships (QSAR) with others for the reactions of benzyl alcohols in diverse systems provides insight into mechanisms of action. A QSAR for the interaction of benzyl alcohols with protozoa yields an equation that is dependent on both hydrophobicity and acidity of the OH group versus a mixture of bacteria and fungi, the critical dependence on hydrophobicity prevails with a small dependence on a resonance-stabilized, radical mediated electronic effect. The chloramphenicols provide an instructive example, where the radical mediated electronic effect overshadows the hydrophobic contribution to bacterial toxicity. These various QSAR for benzyl alcohols indicate that mechanisms of growth inhibition in vitro vary depending on cell/organism type, the strength of the bond and lability of the hydrogen, and the strength of the initiating radical reagent. 相似文献
39.
The present study evaluated the potential of white-rot fungal strain Coriolus versicolor to decolorize five structurally di erent dyes
in sequential batch reactors under optimized conditions. The experiments were run continuously for seven cycles of 8 d each. High
decolorizing activity was observed even during the repeated reuse of the fungus, especially when the old medium was replaced with
fresh medium after every cycle. Biodegradation was the dominating factor as the fungus was able to produce the enzyme laccase mainly,
to mineralize synthetic dyes. The nutrients and composition of the medium played important roles in sustaining the decolorisation
potential of the fungus. Corncob was found be an easy and cheap substitute for carbon source for the fungus. Glucose consumption by
the fungus was in accordance to its decolorisation activity and chemical oxygen demand (COD) reduction. 相似文献
40.
Batiha Gaber El-Saber Al-Gareeb Ali I. Qusti Safaa Alshammari Eida M. Kaushik Deepak Verma Ravinder Al-kuraishy Hayder M. 《Environmental science and pollution research international》2022,29(29):43516-43531
Environmental Science and Pollution Research - The immune system protects human health from the effects of pathogenic organisms; however, its activity is affected when individuals become infected.... 相似文献