全文获取类型
收费全文 | 358篇 |
免费 | 0篇 |
国内免费 | 15篇 |
专业分类
安全科学 | 8篇 |
废物处理 | 27篇 |
环保管理 | 23篇 |
综合类 | 34篇 |
基础理论 | 38篇 |
环境理论 | 1篇 |
污染及防治 | 179篇 |
评价与监测 | 41篇 |
社会与环境 | 20篇 |
灾害及防治 | 2篇 |
出版年
2023年 | 12篇 |
2022年 | 62篇 |
2021年 | 48篇 |
2020年 | 12篇 |
2019年 | 16篇 |
2018年 | 16篇 |
2017年 | 24篇 |
2016年 | 19篇 |
2015年 | 14篇 |
2014年 | 19篇 |
2013年 | 32篇 |
2012年 | 10篇 |
2011年 | 15篇 |
2010年 | 15篇 |
2009年 | 7篇 |
2008年 | 9篇 |
2007年 | 11篇 |
2006年 | 2篇 |
2005年 | 4篇 |
2004年 | 2篇 |
2003年 | 4篇 |
2002年 | 2篇 |
2000年 | 2篇 |
1999年 | 1篇 |
1997年 | 1篇 |
1992年 | 1篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1985年 | 3篇 |
1984年 | 1篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1979年 | 2篇 |
1972年 | 1篇 |
1964年 | 1篇 |
1963年 | 1篇 |
排序方式: 共有373条查询结果,搜索用时 93 毫秒
231.
232.
233.
Khan Syed Abdul Rehman Qianli Dong 《Environmental science and pollution research international》2017,24(20):16829-16844
Environmental Science and Pollution Research - This article investigates the impact of five determinants of the green supply chain practices on organizational performance in the context of Pakistan... 相似文献
234.
Paddy (unmilled rice), milled rice and maize-bound 14C residues were prepared using 14C-succinate-labelled malathion at 10 and 152 ppm. After 3 months, the bound residues accounted for 12%, 6.5% and 17.7% of the applied dose in paddy, milled rice and maize respectively in the grains treated at 10 ppm. The corresponding values for the 152 ppm were 16.6%, 8.5% and 18.8%. Rats fed milled rice - bound 14C-residues eliminated 61% of the 14C in the faeces and 28% in the urine. The corresponding percentages for paddy and maize were 72%, 9% and 53%, 41% respectively; indicating that bound residues from milled rice and maize were moderately bioavailable. When rice-bound malathion residues (0.65 ppm in feed) were administered to rats in a 5 week feeding study, no signs of toxicity were observed. Plasma and RBC cholinesterase activities were slightly inhibited: blood urea nitrogen was significantly elevated in the test animals. Other parameters examined showed no or marginal changes. 相似文献
235.
The Kabartal wetland situated in the upper Indo-Gangetic flood plains in northern India is significant because of its hydrological
and ecological services, and the socio-economic and cultural values that it represents. Despite being designated as a wildlife
sanctuary, this wetland is under threat from anthropogenic pressures. As in the case of most wetlands, the reason is incomplete
information on its ecological services and functions, breakdown of traditional management structures and the lack of appropriate
and recognized property rights. Our study assesses the economic linkages between the Kabartal wetland and the local people
living around it, through socio-economic surveys and Contingent Valuation Method (CVM). The major objective of the study was
to determine the importance of this wetland to the local people and to give an indication of the distribution of the benefits
among various stakeholders. The people in the region are poor, have low literacy levels and high dependence on Kabartal and
more than 50% want that the wetland should be drained and the land used for agriculture. However, they are willing to participate
in collaborative management initiatives with the state. The willingness of people to accept compensation, as an alternative
to access to Kabartal wetland, regressed on various socio-economic and attitudinal parameters, gave an estimated mean value
of US $27,500 per household over a period of 60 years. This value is a pointer of the total value of access to Kabartal wetland
to the surrounding villagers and would be useful when decisions to compensate people for lost access to Kabartal are made. 相似文献
236.
The results of a discrete choice experiment (DCE) as a part of a survey among the urban riverbank residents on the Red River in Winnipeg, Manitoba, Canada, indicated that the risk of over-dike flooding, set at 2 ft above the 1997 flood water level, was a significant determinant of both voluntary and mandatory evacuation, compared to those set at the 1996 or 1997 levels. Mandatory evacuation was more preferred over voluntary evacuation when the likelihood of flooding was at its most severe, and the opposite relationship was the case when the likelihood was low. The notification time for evacuation, suggested as 1, 2, and 4 days, proved to be an insignificant attribute, whereas the respondents indicated significant preference for full flood compensation over an offer of either 80% or 90% flood relief, irrespective of the alternatives of voluntary or mandatory evacuation. 相似文献
237.
Two visitor-monitoring methods, video monitoring and counts by human observers, were compared in order to identify and evaluate their respective advantages and disadvantages. The analysis considered user numbers, user type (walkers, dog walkers, bicyclists, and joggers) and group size of visitors. Remarkable differences were found between the two methods for user type and use levels. At low use levels, evaluations based on video monitoring resulted in fewer single bicyclists compared to counts by human observers, whereas at high use levels, human observers counted fewer walkers and bikers than video-interpreters. Based on this comparative analysis, we derive recommendations for more effective visitor-monitoring approaches. All data were collected during a visitor-monitoring project in the Danube Floodplains National Park in Austria between 1998 and 1999. 相似文献
238.
Rana Zakir Hussain Robert A. Young 《Journal of the American Water Resources Association》1985,21(6):1021-1027
Data from two cross-sectional surveys totaling over 2000 farmers in Pakistan are analyzed with regression techniques to estimate the value productivity of irrigation water and related resources. Returns to irrigation water vary by province, but in general are found to be high relative to estimated costs of obtaining water. Salinity of water supplies is an important productivity depressant. The results will be useful in determining the economic feasibility of various means for augmenting supplies and for improving delivery and application efficiencies. 相似文献
239.
Syed R. Qasim Andrew T. Armstrong John Corn Betty L. Jordan 《Journal of the American Water Resources Association》1980,16(3):522-531
ABSTRACT: Data were developed to determine the quality of water and bottom sediments in the Trinity River, and the mobility of various contaminants when bottom sediments were mixed with the river water under simulated dredging conditions. Thirteen sampling sites were selected. A number of chemical tests including heavy metals and pesticides were conducted on river water, elutriates, and bottom sediments. Statis bioassays using Daphnia magna were conducted on river water and elutriates. Results indicated that the river in the upper reach is grossly polluted due to discharge of waste water effluents from several large treatment plants. High concentrations of nitrogen, phosphorus, organic carbon, COD, heavy metals, and pesticides were found in water and bottom sediments. The concentrations of most of these pollutants exceeded the EPA recommended limits. Elutriation gave no consistent results, perhaps because of release or uptake of contaminants from the sediments. High mortality of D. magna were also recorded in the upper reach of the river. The quality of water and bottom sediments gradually improved in lower reaches. 相似文献
240.
Rapid urbanisation, lack of proactive planning and improper allocation of resources may result in socio-economic disparity among and within cities, causing social unrest and environmental injustice in the neighbourhoods. This study aims to examine whether the planning standards for housing schemes in Pakistan are able to maintain equitable access to green spaces within the cities. Ten residential sites in Sheikhupura city with different housing unit sizes and densities were selected for the study. The supply of urban green infrastructure in housing scheme has been assessed: (i) by comparing the percentage of green spaces, including community parks and open spaces and street landscape; and (ii) by calculating per dwelling unit and per capita share of green spaces. These indicators have been studied against the housing density and population density of the schemes by applying correlation and linear regression models. The results show that all the housing schemes plans provide for similar amounts of green space as a percentage of total area. The per capita share of green spaces is very low in high-density areas, but interestingly, the street landscape has a higher potential to contribute to the overall landscape in high-density neighbourhoods, compensating for low per capita green space. Housing unit density and population density must be incorporated in planning standards so planners can effectively devise a mix of community parks, street landscape and private green spaces to help maintain per capita green spaces, and hence environmental resource equality in different parts of the city. 相似文献