全文获取类型
收费全文 | 82篇 |
免费 | 0篇 |
国内免费 | 3篇 |
专业分类
废物处理 | 3篇 |
环保管理 | 5篇 |
综合类 | 5篇 |
基础理论 | 19篇 |
污染及防治 | 34篇 |
评价与监测 | 11篇 |
社会与环境 | 8篇 |
出版年
2023年 | 3篇 |
2022年 | 6篇 |
2021年 | 7篇 |
2019年 | 2篇 |
2018年 | 5篇 |
2017年 | 2篇 |
2016年 | 4篇 |
2015年 | 1篇 |
2014年 | 5篇 |
2013年 | 9篇 |
2012年 | 3篇 |
2011年 | 3篇 |
2010年 | 7篇 |
2009年 | 6篇 |
2008年 | 3篇 |
2007年 | 7篇 |
2006年 | 3篇 |
2005年 | 2篇 |
2004年 | 2篇 |
2003年 | 1篇 |
2001年 | 1篇 |
1999年 | 1篇 |
1994年 | 1篇 |
1978年 | 1篇 |
排序方式: 共有85条查询结果,搜索用时 31 毫秒
21.
The environmentally friendly and safe disposal of waste discarded rubber tyres are becoming a matter of serious concern across the globe because of its detrimental effect on health, environment and ecological systems. The paper aims at assessing the impact of waste rubber tyre inclusion on the geotechnical properties of clayey soil. Discarded rubber in the form of crumb rubber of size ranging between 0.8 and 2 mm varying from 0 to 10% was used in this investigation. Several tests, namely compaction, unconfined compressive strength, split tensile strength, California bearing ratio, consolidation and swelling pressure, along with microstructural studies have been carried out on different combinations of clayey soil and crumb rubber. The results of the study demonstrate that the inclusion of crumb rubber reduces the maximum dry unit weight and optimum moisture content of the clay. The addition of crumb rubber up to 5% in the clay causes an insignificant increase in the unconfined compressive strength and split tensile strength. Compared with the clayey soil, the inclusion of crumb rubber up to 5% improves the California bearing ratio of the clayey soil in unsoaked condition. It has also noticed that addition of crumb rubber helps in reducing the compression index and swelling pressure of the clayey soil. 相似文献
22.
Geetam Tiwari 《生态毒理学报》2001,23(4):47-48
获得可持续移动性的战略包括促进公共运输、增加不消耗化石燃料运输模式的份额、减少出行距离和促进包括公共运输在内的机械化模式的清洁燃料技术.在印度的大型城市里,大多数出行是通过非机械化运输或公共运输进行.这些城市都有无法接受的空气污染水平和高峰时间的拥挤以及公路交通事故死亡率高的问题.此外,出行距离趋向于变短部分地是由于很多居民被迫居住在靠近他们的工作场所的"未经批准的新住宅区里". 相似文献
23.
Application of ferrate(VI) in the treatment of industrial wastes containing metal-complexed cyanides : A green treatment 总被引:2,自引:0,他引:2
Ferrate(VI) was employed for the oxidation of cyanide (CN) and simultaneous removal of copper or nickel in the mixed/complexed
systems of CN-Cu, CN-Ni, or CN-Cu-Ni. The degradation of CN (1.00 mmol/L) and removal of Cu (0.095 mmol/L) were investigated
as a function of Fe(VI) doses from 0.3–2.00 mmol/L at pH 10.0. It was found that Fe(VI) could readily oxidize CN and the reduction
of Fe(VI) into Fe(III) might serve e ciently for the removal of free copper ions. The increase in Fe(VI) dose apparently favoured the
CN oxidation as well as Cu removal. Moreover, the pH dependence study (pH 10.0–13.0) revealed that the oxidation of CN was almost
una ected in the studied pH range (10.0–13.0), however, the maximum removal e ciency of Cu was obtained at pH 13.0. Similarly,
treatment was carried out for CN-Ni system having the initial Ni concentration of 0.170 mmol/L and CN concentration of 1.00 mmol
with Fe(VI) dose 2.00 mmol at various pH values (10.0–12.0). Results showed a partial oxidation of CN and partial removal of Ni. It
can be observed that Fe(VI) can partially degrade the CN-Ni complex in this pH range. Further, Fe(VI) was applied for the treatment
of simulated industrial waste/e uent waters treatment containing CN, Cu, and Ni. 相似文献
24.
Perrier F Richon P Gautam U Tiwari DR Shrestha P Sapkota SN 《Journal of environmental radioactivity》2007,97(2-3):220-235
The concentration activity of radon-222 has been monitored, with some interruptions, from 1997 to 2005 in the end section of a slightly rising, dead-end, 38-m long tunnel located in the Phulchoki hill, near Kathmandu, Nepal. While a high concentration varying from 6 x 10(3) Bq m(-3) to 10 x 10(3) Bq m(-3) is observed from May to September (rainy summer season), the concentration remains at a low level of about 200 Bq m(-3) from October to March (dry winter season). This reduction of radon concentration is associated with natural ventilation of the tunnel, which, contrary to expectations for a rising tunnel, takes place mainly from October to March when the outside air temperature drops below the average tunnel temperature. This interpretation is supported by temperature measurements in the atmosphere of the tunnel, a few meters away from the entrance. The temporal variations of the diurnal amplitude of this temperature indeed follow the ventilation rate deduced from the radon measurements. In the absence of significant ventilation (summer season), the radon exhalation flux at the rock surface into the tunnel atmosphere can be inferred; it exhibits a yearly variation with additional transient reductions associated with heavy rainfall, likely to be due to water infiltration. No effect of atmospheric pressure variations on the radon concentration is observed in this tunnel. This experiment illustrates how small differences in the location and geometry of a tunnel can lead to vastly different behaviours of the radon concentration versus time. This observation has consequences for the estimation of the dose rate and the practicability of radon monitoring for tectonic purposes in underground environments. 相似文献
25.
Alok Kumar Vikram Bhardwaj Jitendra Nath Tiwari Devendra Kumar Patel Dhruv Sen Singh Ram Lakhan Singh 《毒物与环境化学》2013,95(2):373-381
Amyotrophic lateral sclerosis (ALS), a progressive disorder that usually runs a fatal course within 2–5 years of onset, is characterized by loss of motor neurons in the cortex, brain stem, and spinal cord. In this study mercury (Hg) concentrations were determined in blood samples of 40 ALS patients, of whom 24 ALS patients were from the Ganga plain region and their metal levels were found to be significantly higher. In contrast, Hg levels in the 16 ALS patients from non-Ganga plain regions whose levels were similar to those of the control subjects. Mercury in stream water samples and freshly deposited stream sediment were determined in the locations of patients’ native residences along the Ganga plain region and metal levels were found to be higher than the threshold guideline values for Hg in stream waters recommended by WHO. The geo-accumulation index in selected sites of freshly deposited stream sediment ranged from moderate to highly polluted. The high levels of Hg observed in ALS patients may potentially alter the redox status of neuronal cell components and induce cell-death pathways. 相似文献
26.
Sahu Rakesh Kumar Pervez Shamsh Chow Judith C. Watson John G. Tiwari Suresh Panicker Abhilash S. Chakrabarty Rajan K. Pervez Yasmeen Fatima 《Environmental geochemistry and health》2018,40(5):2205-2222
Environmental Geochemistry and Health - This study describes spatiotemporal patterns from October 2015 to September 2016 for PM2.5 mass and carbon measurements in rural (Kosmarra), urban (Raipur),... 相似文献
27.
Mishra AK Tiwari HS Bhatt RK 《Journal of environmental biology / Academy of Environmental Biology, India》2010,31(6):987-993
The growth, biomass production and photosynthesis of Cenchrus ciliaris was studied under the canopies of 17 yr old Acacia tortilis trees in semi arid tropical environment. On an average the full grown canopy of A. tortilis at the spacing of 4 x 4 m allowed 55% of total Photosynthetically Active Radiation (PAR) which in turn increased Relative Humidity (RH) and reduced under canopy temperature to -1.75 degrees C over the open air temperature. C. ciliaris attained higher height under the shade of A. tortilis. The tiller production and leaf area index decreased marginally under the shade of tree canopies as compared to the open grown grasses. C. ciliaris accumulated higher chlorophyll a and b under the shade of tree canopies indicating its shade adaptation potential. The assimilatory functions such as rate of photosynthesis, transpiration, stomatal conductance, photosynthetic water use efficiency (PN/TR) and carboxylation efficiency (PN/CINT) decreased under the tree canopies due to low availability of PAR. The total biomass production in term of fresh and dry weight decreased under the tree canopies. On average of 2 yr C. ciliaris had produced 12.78 t ha(-1) green and 3.72 -t ha(-1) dry biomass under the tree canopies of A. tortilis. The dry matter yield reduced to 38% under the tree canopies over the open grown grasses. The A. tortilis + C. ciliaris maintained higher soil moisture, organic carbon content and available N P K for sustainable biomass production for the longer period. The higher accumulation of crude protein, starch, sugar and nitrogen in leaves and stem of C. ciliaris indicates that this grass species also maintained its quality under A. tortilis based silvopastoral system. The photosynthesis and dry matter accumulation are closely associated with available PAR indicating that for sustainable production of this grass species in the silvopasture systems for longer period about 55% or more PAR is required. 相似文献
28.
Aranked set sample (RSS), if not balanced, is simply a sample of independent order statistics gener- ated from the same underlying distribution F. Kvam and Samaniego (1994) derived maximum likelihood estimates of F for a general RSS. In many applications, including some in the environ- mental sciences, prior information about F is available to supplement the data-based inference. In such cases, Bayes estimators should be considered for improved estimation. Bayes estimation (using the squared error loss function) of the unknown distribution function F is investigated with such samples. Additionally, the Bayes generalized maximum likelihood estimator (GMLE) is derived. An iterative scheme based on the EM Algorithm is used to produce the GMLE of F. For the case of squared error loss, simple solutions are uncommon, and a procedure to find the solution to the Bayes estimate using the Gibbs sampler is illustrated. The methods are illustrated with data from the Natural Environmental Research Council of Great Britain (1975), representing water discharge of floods on the Nidd River in Yorkshire, England 相似文献
29.
The role of atmospheric transformations in determining environmental impacts of carbonaceous nanoparticles 总被引:1,自引:0,他引:1
In studies that have explored the potential environmental impacts of manufactured nanomaterials, the atmosphere has largely been viewed as an inert setting that acts merely as a route for inhalation exposure. Manufactured nanomaterials will enter the atmosphere during production, use, and disposal, and rather than simply being transported, airborne nanoparticles are in fact subject to physical and chemical transformations that could modify their fate, transport, bioavailability, and toxicity once they deposit to aqueous and terrestrial ecosystems. The objective of this paper is to review the factors affecting carbonaceous nanomaterials' behavior in the environment and to show that atmospheric transformations, often overlooked, have the potential to alter nanoparticles' physical and chemical properties and thus influence their environmental fate and impact. Atmospheric processing of naturally occurring and incidental nanoparticles takes place through coagulation, condensation, and oxidation; these phenomena are expected to affect manufactured nanoparticles as well. It is likely that carbonaceous nanomaterials in the atmosphere will be oxidized, effectively functionalizing them. By influencing size, shape, and surface chemistry, atmospheric transformations have the potential to affect a variety of nanoparticle-environment interactions, including solubility, interaction with natural surfactants, deposition to porous media, and ecotoxicity. Potential directions for future research are suggested to address the current lack of information surrounding atmospheric transformations of engineered nanomaterials. 相似文献
30.
Rakesh Tiwari Indu K. Murthy N. H. Ravindranath 《Environment, Development and Sustainability》2012,14(2):253-271
Indian village ecosystems are diverse with respect to population pressures, agricultural activities and production, livestock
composition, energy sources, economics and infrastructural capabilities. Natural resource degradation is a major global concern
and the factors and processes leading to degradation are regional and scale up from the micro levels such as village ecosystems.
There is need for integrated multidisciplinary approaches for monitoring the resource status and environmental issues at the
decentralized level. This paper presents an approach to assess village ecosystems using a set of key indicators developed
and tested across fourteen diverse village ecosystems of the Southern India. The concept of ecosystem services associated
with village ecosystems of India has been described and adopted to identify indicators and assess issues and trends. Comparison
across villages has been demonstrated and the indicators successfully reflected the key environmental issues at each village
level as well as differences across villages. We also report unique cases of stabilized land use and ‘desakota-like’ trends
from village ecosystem studied. 相似文献