全文获取类型
收费全文 | 262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 | 31篇 |
环保管理 | 40篇 |
综合类 | 26篇 |
基础理论 | 52篇 |
污染及防治 | 63篇 |
评价与监测 | 45篇 |
社会与环境 | 8篇 |
出版年
2023年 | 4篇 |
2022年 | 6篇 |
2021年 | 5篇 |
2020年 | 5篇 |
2019年 | 3篇 |
2018年 | 7篇 |
2017年 | 5篇 |
2016年 | 8篇 |
2015年 | 12篇 |
2014年 | 10篇 |
2013年 | 38篇 |
2012年 | 16篇 |
2011年 | 16篇 |
2010年 | 15篇 |
2009年 | 8篇 |
2008年 | 17篇 |
2007年 | 8篇 |
2006年 | 10篇 |
2005年 | 9篇 |
2004年 | 10篇 |
2003年 | 8篇 |
2002年 | 7篇 |
2001年 | 8篇 |
2000年 | 5篇 |
1999年 | 1篇 |
1997年 | 2篇 |
1996年 | 1篇 |
1995年 | 6篇 |
1994年 | 1篇 |
1993年 | 2篇 |
1992年 | 1篇 |
1991年 | 1篇 |
1990年 | 2篇 |
1984年 | 1篇 |
1983年 | 2篇 |
1982年 | 2篇 |
1979年 | 2篇 |
1977年 | 1篇 |
1972年 | 1篇 |
排序方式: 共有266条查询结果,搜索用时 31 毫秒
91.
Examining Hazard Mitigation Within the Context of Public Goods 总被引:1,自引:0,他引:1
Reddy SD 《Environmental management》2000,25(2):129-141
/ This paper presents a case study of an American barrier island devastated by a hurricane to show how it is addressing the free-riding problem and protecting its public goods, thereby contributing to hazard mitigation. It examines hazard mitigation and the free-riding problem within the public goods framework. Free-riding is a term used in the public choice theory and common pool resource literature. It is a term used for describing the actions of rational individuals who freely exploit a collective or public good at the expense of others. Free-riding is a major problem faced by public goods. The problem very frequently occurs in the context of hazard mitigation and coastal resource management. Very little is known about the factors that contribute to the promotion of hazard mitigation. This paper identifies some of the important factors that help local institutions provide and sustain hazard mitigation measures. Theoretical and practical implications for hazards research and disaster management policy are presented. 相似文献
92.
Reddy MS Basha S Joshi HV Sravan Kumar VG Jha B Ghosh PK 《Waste management (New York, N.Y.)》2005,25(7):747-754
Alang-Sosiya is the largest ship-scrapping yard in the world, established in 1982. Every year an average of 171 ships having a mean weight of 2.10 x 10(6)(+/-7.82 x 10(5)) of light dead weight tonnage (LDT) being scrapped. Apart from scrapped metals, this yard generates a massive amount of combustible solid waste in the form of waste wood, plastic, insulation material, paper, glass wool, thermocol pieces (polyurethane foam material), sponge, oiled rope, cotton waste, rubber, etc. In this study multiple regression analysis was used to develop predictive models for energy content of combustible ship-scrapping solid wastes. The scope of work comprised qualitative and quantitative estimation of solid waste samples and performing a sequential selection procedure for isolating variables. Three regression models were developed to correlate the energy content (net calorific values (LHV)) with variables derived from material composition, proximate and ultimate analyses. The performance of these models for this particular waste complies well with the equations developed by other researchers (Dulong, Steuer, Scheurer-Kestner and Bento's) for estimating energy content of municipal solid waste. 相似文献
93.
Exposure of the freshwater field crab Barytelphusa guerini to a sublethal concentration of NaF (30 mg litre(-1)) caused significant alterations in protein metabolism. After an exposure time of 15 days, the crab was found to have a marked depletion of total protein and free amino acid content. A significant elevation in transaminases, Aspartate aminotransferase (AAT) and Alanine aminotransferase (ALAT), and Glutamate dehydrogenase (GDH) activities was reflected in the free amino acid levels of the tissues. 相似文献
94.
Pant HK Nair VD Reddy KR Graetz DA Villapando RR 《Journal of environmental quality》2002,31(4):1399-1405
Agricultural lands are often used for constructing stormwater treatment areas (STAs) to abate nutrient loading to adjacent aquatic systems. Flooding agricultural lands to create STAs could stimulate a significant release of phosphorus (P) from soil to the water column. To assess the suitability of agricultural lands, specifically those impacted by animal operations, for the construction of STAs, soils from different components of the New Palm-Newcomer dairies (Nubbin Slough Basin, Okeechobee, Florida, USA) were collected by horizon and their P retention and release capacities estimated. In general, P released from A-horizon soil under flooded (anaerobic) conditions was greater than under drained (aerobic) conditions due to redox effect on iron (Fe) and consequent P releases. However, the P released from Bh-horizon soil was greater under aerobic conditions than under anaerobic conditions, possibly due to excessive aluminum (Al) content in the horizon. Double acid-extractable calcium (Ca), magnesium (Mg), Al, and P explained 87% of the variability in P release under aerobic conditions, and 80% of that under anaerobic conditions. The P release maxima indicated a high solubility of P in A-horizon soil from both active and abandoned dairies (13 and 8% of the total P, respectively), suggesting that these soils could function as potential sources of P to the overlying water column when used in STA construction. Preestablishment of vegetative communities or chemical amendment, however, could ameliorate high P flux from soil to the water column. 相似文献
95.
Accretion of organic matter in wetlands provides long-term storage for nutrients and other contaminants. Water-table fluctuations and resulting alternate flooded and drained conditions may substantially alter the stability of stored materials including phosphorus (P). To study the effects of hydrologic fluctuation on P mobilization in wetlands, recently accreted detrial material (derived primarily from Typha spp.) was collected from the Everglades Nutrient Removal Project (ENRP), a constructed wetland used to treat agricultural drainage water in the northern Everglades. The detrital material was subjected to different periods of drawdown and consecutive reflooding under laboratory conditions. The 31P nuclear magnetic resonance (31P NMR) spectroscopy analysis revealed that sugar phosphate, glycerophosphate, polynucleotides, and phospholipids (glycerophosphoethanolamine and glycerophosphocholine) were the major forms of P in the detrital material. After 30 d of drawdown, polynucleotides were reduced to trace levels, whereas sugar phosphate, glycerophosphate, and phospholipids remained the major fractions of organic P. Microorganisms seemed to preferentially utilize nucleic acid P, perhaps to obtain associated nutrients including carbon and nitrogen. At the end of the 30-d reflooding period, cumulative P flux from detritus to water column accounted for 3% of the total P (< or = 15 d of drawdown) and further decreased to 2% at 30 d of drawdown, but increased to 8% at 60 d of drawdown. The drawdown (< or = 30 d) not only reduced P flux to the water column, but also increased the humification and microbial immobilization of P. Excessive drawdown (60 d), however, triggered the release of P into the water column as the water content of detritus decreased from 95 to 11%. 相似文献
96.
Babu MS Gopal NV Reddy KP 《Journal of environmental biology / Academy of Environmental Biology, India》2007,28(1):21-27
This study reports the effects of low level developmental Pb exposure on specific brain regions like hippocampus, cerebellum and cerebral hemispheres of antioxidant enzyme activities. Wistar dams were exposed to 50 ppm, 100 ppm and 500 ppm of Pb acetate in drinking water during pregnancy and lactation (gestation day 6 through PND 21 (post natal day) and activities of superoxide dismutase (SOD), glutathione peroxidase (GSH-Px) and glutathione reductase (GR) were determined in the hippocampus, cerebellum and cerebral hemispheres of pups during treatment period (PND 7, 14, and 21 days) and also during withdrawl period (PND 35, 45, 60 and 90 days). During treatment period, SOD activity significantly (p < 0.05) decreased in all regions of all the treated groups with maximum decrease in 500 ppm treated group of 21 days, while GSH-Px and GR activities increased with maximum increase in 21 days aged 500 ppm group. During withdrawl period, the activities of all enzymes were significantly (p < 0.05) reversed. Thus the perinatal exposure of dams to variable dosages of low level lead results in characteristic neurochemical alterations in rat brain regions due to impaired antioxidants function. 相似文献
97.
K. R. L. Saranya C. Sudhakar Reddy P. V. V. Prasada Rao C. S. Jha 《Environmental monitoring and assessment》2014,186(5):3283-3296
Analyzing the spatial extent and distribution of forest fires is essential for sustainable forest resource management. There is no comprehensive data existing on forest fires on a regular basis in Biosphere Reserves of India. The present work have been carried out to locate and estimate the spatial extent of forest burnt areas using Resourcesat-1 data and fire frequency covering decadal fire events (2004–2013) in Similipal Biosphere Reserve. The anomalous quantity of forest burnt area was recorded during 2009 as 1,014.7 km2. There was inconsistency in the fire susceptibility across the different vegetation types. The spatial analysis of burnt area shows that an area of 34.2 % of dry deciduous forests, followed by tree savannah, shrub savannah, and grasslands affected by fires in 2013. The analysis based on decadal time scale satellite data reveals that an area of 2,175.9 km2 (59.6 % of total vegetation cover) has been affected by varied rate of frequency of forest fires. Fire density pattern indicates low count of burnt area patches in 2013 estimated at 1,017 and high count at 1,916 in 2004. An estimate of fire risk area over a decade identifies 12.2 km2 is experiencing an annual fire damage. Summing the fire frequency data across the grids (each 1 km2) indicates 1,211 (26 %) grids are having very high disturbance regimes due to repeated fires in all the 10 years, followed by 711 grids in 9 years and 418 in 8 years and 382 in 7 years. The spatial database offers excellent opportunities to understand the ecological impact of fires on biodiversity and is helpful in formulating conservation action plans. 相似文献
98.
Anthropogenic activities associated with industrialization, agriculture and urbanization have led to the deterioration in
water quality due to various contaminants. To assess the status of urban drinking water quality, samples were collected from
the piped supplies as well as groundwater sources from different localities of residential, commercial and industrial areas
of Lucknow City in a tropical zone of India during pre-monsoon for estimation of coliform and faecal coliform bacteria, organochlorine
pesticides (OCPs) and heavy metals. Bacterial contamination was found to be more in the samples from commercial areas than
residential and industrial areas. OCPs like α,γ-hexachlorocyclohexane and 1,1 p,p-DDE {dichloro-2, 2-bis(p-chlorophenyl) ethene)}
were found to be present in most of the samples from study area. The total organochlorine pesticide levels were found to be
within the European Union limit (0.5 μg/L) in most of the samples. Most of the heavy metals estimated in the samples were
also found to be within the permissible limits as prescribed by World Health Organization for drinking water. Thus, these
observations show that contamination of drinking water in urban areas may be mainly due to municipal, industrial and agricultural
activities along with improper disposal of solid waste. This is an alarm to safety of public health and aquatic environment
in tropics. 相似文献
99.
Hydrogeochemical characterization of contaminated groundwater in Patancheru industrial area,southern India 总被引:1,自引:0,他引:1
The groundwater is one of the most contaminated natural resources in Patancheru industrial area due to unplanned and haphazard
industrial growth and urbanization without following basic pollution control norms. The rapid industrialization initiated
in early 1970 has started showing up its after effects few years later in the form of physiochemical contamination of the
both surface and groundwater bodies of the area. It has resulted in local people being deprived of safe drinking water, plant
and aquatic life has severely affected, and situation is deteriorating over the years in the area in spite of some preventive
and remedial measures being initiated. The focus of the present study is to understand the chemical characteristics of groundwater
and geochemical processes the contaminant water is undergoing which are normally imprinted in its ionic assemblages. The water
samples collected in pre- and post-monsoon seasons from forty two groundwater and four surface water sources were analyzed
for major constituents such as Ca2+, Mg2+, Na+, K+, CO3−, HCO3−, Cl−, SO42−, NO3−, and F−, and selected samples were tested for ten important trace metals like Fe, Pb, Bi, Mn, Cr, Co, Ni, Cu, Zn, and Cd. Na+ among cations and Cl− among anions dominate the water in both the seasons where as Ca2+, HCO3−, and Cl− show significant reduction in their ionic strength in post-monsoon. The groundwater in general is of mixed type, but most
of it belong to Na+–Cl−, Na+–HCO3−, Ca2+–Mg2+–HCO3−, and Ca2+–Mg2+–Cl− facies. The Na+ and Ca2+ are in the transitional state with Na+ replacing Ca2+ and HCO3−–Cl− due to physiochemical changes in the aquifer system. The evaluation of hydrochemistry through various ionic indices, ratios,
and plots suggest that silicate–carbonate weathering, ion exchange, dissolution, and evaporation processes are responsible
for origin of the present chemical status of the groundwater which is also controlled by the contamination from extraneous
sources that could have accelerated the dissolution processes. Gibbs plots authenticate that the evolution of water chemistry
is influenced by interaction of percolating water with aquifer matrix apart from anthropogenic enrichment of elements which
get over concentrated due to evaporation. 相似文献
100.
R.?RejaniEmail author K.?V.?Rao M.?Osman Ch.?Srinivasa Rao K.?Sammi?Reddy G.?R.?Chary Pushpanjali Josily?Samuel 《Environmental monitoring and assessment》2016,188(3):143
The ungauged wet semi-arid watershed cluster, Seethagondi, lies in the Adilabad district of Telangana in India and is prone to severe erosion and water scarcity. The runoff and soil loss data at watershed, catchment, and field level are necessary for planning soil and water conservation interventions. In this study, an attempt was made to develop a spatial soil loss estimation model for Seethagondi cluster using RUSLE coupled with ARCGIS and was used to estimate the soil loss spatially and temporally. The daily rainfall data of Aphrodite for the period from 1951 to 2007 was used, and the annual rainfall varied from 508 to 1351 mm with a mean annual rainfall of 950 mm and a mean erosivity of 6789 MJ mm ha?1 h?1 year?1. Considerable variation in land use land cover especially in crop land and fallow land was observed during normal and drought years, and corresponding variation in the erosivity, C factor, and soil loss was also noted. The mean value of C factor derived from NDVI for crop land was 0.42 and 0.22 in normal year and drought years, respectively. The topography is undulating and major portion of the cluster has slope less than 10°, and 85.3 % of the cluster has soil loss below 20 t ha?1 year?1. The soil loss from crop land varied from 2.9 to 3.6 t ha?1 year?1 in low rainfall years to 31.8 to 34.7 t ha?1 year?1 in high rainfall years with a mean annual soil loss of 12.2 t ha?1 year?1. The soil loss from crop land was higher in the month of August with an annual soil loss of 13.1 and 2.9 t ha?1 year?1 in normal and drought year, respectively. Based on the soil loss in a normal year, the interventions recommended for 85.3 % of area of the watershed includes agronomic measures such as contour cultivation, graded bunds, strip cropping, mixed cropping, crop rotations, mulching, summer plowing, vegetative bunds, agri-horticultural system, and management practices such as broad bed furrow, raised sunken beds, and harvesting available water using farm ponds and percolation tanks. This methodology can be adopted for estimating the soil loss from similar ungauged watersheds with deficient data and for planning suitable soil and water conservation interventions for the sustainable management of the watersheds. 相似文献