全文获取类型
收费全文 | 161篇 |
免费 | 2篇 |
国内免费 | 2篇 |
专业分类
安全科学 | 1篇 |
废物处理 | 5篇 |
环保管理 | 20篇 |
综合类 | 4篇 |
基础理论 | 35篇 |
环境理论 | 2篇 |
污染及防治 | 58篇 |
评价与监测 | 32篇 |
社会与环境 | 7篇 |
灾害及防治 | 1篇 |
出版年
2023年 | 2篇 |
2022年 | 3篇 |
2021年 | 12篇 |
2020年 | 4篇 |
2019年 | 3篇 |
2018年 | 6篇 |
2017年 | 9篇 |
2016年 | 5篇 |
2015年 | 4篇 |
2014年 | 10篇 |
2013年 | 26篇 |
2012年 | 7篇 |
2011年 | 8篇 |
2010年 | 12篇 |
2009年 | 6篇 |
2008年 | 7篇 |
2007年 | 13篇 |
2006年 | 3篇 |
2005年 | 2篇 |
2004年 | 1篇 |
2003年 | 2篇 |
2002年 | 4篇 |
2001年 | 1篇 |
2000年 | 1篇 |
1999年 | 1篇 |
1996年 | 1篇 |
1994年 | 5篇 |
1991年 | 1篇 |
1988年 | 1篇 |
1982年 | 1篇 |
1978年 | 1篇 |
1976年 | 1篇 |
1966年 | 1篇 |
1959年 | 1篇 |
排序方式: 共有165条查询结果,搜索用时 15 毫秒
151.
Richard Z. Meng Prakash Karamchandani Christian Seigneur 《Journal of the Air & Waste Management Association (1995)》2013,63(5):869-874
ABSTRACT The visual impact of primary particles emitted from stacks is regulated according to stack opacity criteria. In-stack monitoring of the flue gas opacity allows plant operators to ensure that the plant meets U.S. Environmental Protection Agency opacity regulations. However, the emission of condensable gases such as SO3 (that hydrolyzes to H2SO4), HCl, and NH3, which may lead to particle formation after their release from the stack, makes the prediction of stack plume opacity more difficult. We present here a computer simulation model that calculates the opacity due to both primary particles emitted from the stack and secondary particles formed in the atmosphere after the release of condensable gases from the stack. A comprehensive treatment of the plume rise due to buoyancy and momentum is used to calculate the location at which the condensed water plume has evaporated (i.e., where opacity regulations apply). Conversion of H2SO4 to particulate sulfate occurs through nucleation and condensation on primary particles. A thermodynamic aerosol equilibrium model is used to calculate the amount of ammonium, chloride, and water present in the particulate phase with the condensed sulfate. The model calculates the stack plume opacity due to both primary and secondary particles. Examples of model simulations are presented for three scenarios that differ by the emission control equipment installed at the power plant: (1) electrostatic precipitators (ESP), (2) ESP and flue gas desulfurization, and (3) ESP and selective catalytic reduction. The calculated opacity is most sensitive to the primary particulate emissions. For the conditions considered here, SO3 emissions showed only a small effect, except if one assumes that most H2SO4 condenses on primary particles. Condensation of NH4Cl occurs only at high NH3 emission rates (about 25 ppm stack concentration). 相似文献
152.
Prakash Anand Palkar Ritesh Ramesh 《Environmental science and pollution research international》2023,30(10):24804-24814
Environmental Science and Pollution Research - This paper deals with the techniques to use plastic waste for co-processing in cement kiln for energy recovery. Plastics, a versatile material and... 相似文献
153.
Assessment of mining activities on tree species and diversity in hilltop mining areas using Hyperion and Landsat data 总被引:1,自引:0,他引:1
Kayet Narayan Pathak Khanindra Chakrabarty Abhisek Kumar Subodh Singh Chandra Prakash Chowdary Vemuri Muthayya 《Environmental science and pollution research international》2020,27(34):42750-42766
Environmental Science and Pollution Research - The tree species and its diversity are two critical components to be monitored for sustainable management of forest as well as biodiversity... 相似文献
154.
Watson JG Chen LW Chow JC Doraiswamy P Lowenthal DH 《Journal of the Air & Waste Management Association (1995)》2008,58(2):265-288
Receptor models are used to identify and quantify source contributions to particulate matter and volatile organic compounds based on measurements of many chemical components at receptor sites. These components are selected based on their consistent appearance in some source types and their absence in others. UNMIX, positive matrix factorization (PMF), and effective variance are different solutions to the chemical mass balance (CMB) receptor model equations and are implemented on available software. In their more general form, the CMB equations allow spatial, temporal, transport, and particle size profiles to be combined with chemical source profiles for improved source resolution. Although UNMIX and PMF do not use source profiles explicitly as input data, they still require measured profiles to justify their derived source factors. The U.S. Supersites Program provided advanced datasets to apply these CMB solutions in different urban areas. Still lacking are better characterization of source emissions, new methods to estimate profile changes between source and receptor, and systematic sensitivity tests of deviations from receptor model assumptions. 相似文献
155.
K. Wyat Appel Prakash V. Bhave Alice B. Gilliland Golam Sarwar Shawn J. Roselle 《Atmospheric environment (Oxford, England : 1994)》2008,42(24):6057-6066
This paper is Part II in a pair of papers that examines the results of the Community Multiscale Air Quality (CMAQ) model version 4.5 (v4.5) and discusses the potential explanations for the model performance characteristics seen. The focus of this paper is on fine particulate matter (PM2.5) and its chemical composition. Improvements made to the dry deposition velocity and cloud treatment in CMAQ v4.5 addressing compensating errors in 36-km simulations improved particulate sulfate (SO42−) predictions. Large overpredictions of particulate nitrate (NO3−) and ammonium (NH4+) in the fall are likely due to a gross overestimation of seasonal ammonia (NH3) emissions. Carbonaceous aerosol concentrations are substantially underpredicted during the late spring and summer months, most likely due, in part, to a lack of some secondary organic aerosol (SOA) formation pathways in the model. Comparisons of CMAQ PM2.5 predictions with observed PM2.5 mass show mixed seasonal performance. Spring and summer show the best overall performance, while performance in the winter and fall is relatively poor, with significant overpredictions of total PM2.5 mass in those seasons. The model biases in PM2.5 mass cannot be explained by summing the model biases for the major inorganic ions plus carbon. Errors in the prediction of other unspeciated PM2.5 (PMOther) are largely to blame for the errors in total PM2.5 mass predictions, and efforts are underway to identify the cause of these errors. 相似文献
156.
157.
This study aimed to evaluate the reparative potential of ascorbic acid (AA, 100 mg/kg, orally for 28 days) in sub-acute lead (Pb, 100 ppm in drinking water for 28 days) or cypermethrin (CPM, 50 mg/kg, orally in vehicle for 28 days) poisoning alone and as binary mixture on the basis of oxidative stress parameters in erythrocytes of Wistar rats. Both Pb and CPM produced significant increase in lipid peroxidation along with elevated glutathione-S-transferase and catalase activity individually but not as a binary mixture. Glutathione peroxidase activity was significantly increased but glutathione levels were significantly reduced irrespective of single or co-exposure while the activity of superoxide dismutase and erythrocytic protein content were not significantly affected. Co-exposure led to a comparatively lower level of oxidative stress than that induced by Pb or CPM alone indicating an antagonistic toxicodynamic profile in rat erythrocytes. Co-administration of AA along with Pb and/or CPM significantly restored the oxidative stress parameters to normal values. Overall results indicated that co-exposure induces a lower level of oxidative stress and AA ameliorates Pb- and/or CPM-induced oxidative damage in rat erythrocytes. 相似文献
158.
Chinnasamy Rajaram Prakash Theivendran Panneerselvam Sundararajan Raja 《毒物与环境化学》2013,95(8):1397-1407
In the present study, a series of novel Schiff bases of isatin were synthesized by condensation of imesatin with different aromatic aldehydes. The imesatins were synthesized by reaction of isatin with p-phenylenediamine. The chemical structures of the synthesized compounds were confirmed by means of IR, 1H-NMR, 13C-NMR, mass spectroscopy, and elemental analysis. These compounds were screened for antioxidant activity by DPPH, nitric oxide and hydrogen peroxide radical scavenging activity. In all the methods, the compound 3-(4-(3,4,5-trimethoxy benzylideneamino)phenylimino) indoline-2-one (5d) showed highest antioxidant activity because of the presence of electron donating groups and the compound 3-(4-(4-nitrobenzylideneamino)phenylimino) indoline-2-one (5f) showed the least activity because of the presence of an electron withdrawing group. 相似文献
159.
Prakash Karamchandani Kristen Lohman Christian Seigneur 《Environmental Fluid Mechanics》2009,9(1):59-71
Several air toxics are emitted from mobile sources on roadways and these emissions account for a significant fraction of the
health risks to the population. In addition, health effect studies are now becoming more comprehensive and some account for
the spatial heterogeneities of air pollutant concentration fields (as is the case near roadways). Standard models can simulate
either the near-source concentration fields or the urban background, but no model can handle both spatial scales in the vicinity
of roadways in a coherent and scientifically correct manner. Here, we present a model that provides such an integrated treatment
by combining a grid-based air quality model of the urban background with a plume-in-grid representation of roadway emissions.
The model is applied to simulate near-roadway concentrations due to emissions from a busy interstate highway in New York City.
Qualitative comparisons with typical measured concentration profiles show that the model captures the observed features of
toxic air pollutant concentrations near roadways. 相似文献
160.
Ravikumar S Williams GP Shanthy S Gracelin NA Babu S Parimala PS 《Journal of environmental biology / Academy of Environmental Biology, India》2007,28(1):109-114
The diversity of phosphobacteria in Manakudi mangrove ecosystem of Tamil Nadu was carried out in root and rhizosphere soil samples. The counts of phosphobacteria were found higher in root samples than in soil samples particularly in Hymenachene acutigluma. The abundance of phosphobacterial diversity in Manakudi mangrove showed high degree of positive correlation with the content of phosphate in rhizosphere soil of all the mangrove and associated plant species. Nine phosphobacterial species belonging to 7 genera were reported from Manakudi mangrove ecosystem. All the identified bacterial species are sensitive to both the heavy metals (mercury and zinc) in terms of growth and physiology even at lower concentrations. The content of protein and total sugars were increased by the higher concentrations of heavy metals whereas decreased trend was noticed in lower concentrations of heavy metals. 相似文献