首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   1910篇
  免费   909篇
  国内免费   40篇
安全科学   432篇
废物处理   11篇
环保管理   264篇
综合类   1157篇
基础理论   541篇
环境理论   3篇
污染及防治   100篇
评价与监测   137篇
社会与环境   110篇
灾害及防治   104篇
  2025年   33篇
  2024年   132篇
  2023年   162篇
  2022年   141篇
  2021年   150篇
  2020年   120篇
  2019年   138篇
  2018年   119篇
  2017年   124篇
  2016年   147篇
  2015年   109篇
  2014年   109篇
  2013年   214篇
  2012年   140篇
  2011年   134篇
  2010年   110篇
  2009年   97篇
  2008年   77篇
  2007年   93篇
  2006年   75篇
  2005年   63篇
  2004年   63篇
  2003年   67篇
  2002年   43篇
  2001年   42篇
  2000年   40篇
  1999年   19篇
  1998年   14篇
  1997年   11篇
  1996年   8篇
  1995年   9篇
  1994年   10篇
  1993年   2篇
  1992年   7篇
  1991年   6篇
  1990年   3篇
  1989年   2篇
  1988年   2篇
  1987年   3篇
  1985年   3篇
  1984年   1篇
  1983年   1篇
  1982年   2篇
  1981年   5篇
  1980年   1篇
  1979年   1篇
  1977年   2篇
  1973年   2篇
  1972年   1篇
  1971年   1篇
排序方式: 共有2859条查询结果,搜索用时 0 毫秒
121.
室内家具产品释放的挥发性有机物(Volatile Organic Compounds,VOCs)对人类健康的影响越来越引起人们的关注,而专门针对室内板材家具产品释放的的VOCs进行来源及健康风险方面的研究较少。文章首次采用15 m^3环境测试舱模拟两种不同板材家具产品在实际居住环境中VOCs的释放水平,对采集的VOCs样品采用气相色谱-质谱联用仪(GC-MS)对板材家具产品及其原辅料释放的VOCs进行了高通量同步筛查研究、溯源分析和风险评估。结果表明:板材家具A释放VOCs主要以芳香烃为主,占比为77.24%,主要单体组分为邻二甲苯、对二甲苯、乙苯、环己烷和异丁醇,其中,邻二甲苯的含量最高,占比达到42.45%;板材家具B释放VOCs主要以烷烃类和芳香烃类为主,占比分别为48.46%和40.41%,正庚烷、邻二甲苯、间/对二甲苯、环己烷和异丁醇含量较高,其中,正庚烷的含量最高为40.25%。由板材家具A样品的溯源分析可知,板材家具产品释放的VOCs受面漆、底漆、稀释剂和固化剂的影响较大,尤其是稀释剂和底漆VOCs释放贡献最大。健康风险评价发现两种板材家具中释放的乙苯、四氯乙烯和三氯甲烷均存在一定的致癌风险,且乙苯的致癌风险高出EPA标准1-2个数量级;间/对二甲苯在两种板材家具中均存在非致癌风险,成年男性的致癌风险值和非致癌风险值均稍高于成年女性,儿童的致癌风险值和非致癌风险值均高于成年人和老年人,因此,从致癌和非致癌风险角度,应从源头管控板材家具生产过程原辅料尤其是稀释剂、底漆和固化剂中乙苯、邻二甲苯的含量,从而减少对人体健康的危害。  相似文献   
122.
上海地区河流健康评价方法探讨   总被引:4,自引:0,他引:4  
界定了河流健康的概念,基于对国外河流健康表征指标的剖析,尝试从河流水文、河流形态、河岸带状况、水质理化参数以及河流生物5方面对河流健康进行评价,初步提出由5个1级指标、17个2级指标架构的城市河流健康评价体系.通过国际调研、标准对照、专家咨询等方法制定相关评价标准,基于简明的评价模型将河流健康状况划分为很健康、健康、亚健康、不健康和病态5个等级.以上海中心城区某河流为例,对其健康状况进行评价.  相似文献   
123.
随着铂族金属铂(Pt)、钯(Pd)、铑(Rh)被广泛应用于汽车尾气催化净化器中,这三种金属在自然界中的含量逐渐升高。越来越多的研究表明,这几种曾被认为对环境影响较小的金属的确会带来潜在的生态健康风险。本文概括了国内外城市各种环境介质的含量分布,重点分析了铂族金属的源解析方法、粒径分布特性、影响其排放的因素和其潜在的生态健康风险。就全世界的城市来看,灰尘、空气、土壤、沉积物等各种环境介质中铂族金属的含量均有显著提高,主要来源于汽车三元催化净化器。这三种金属倾向于富集在细颗粒中,行车模式是影响其排放量的重要因素,自然界的共存物质可增强它们的溶解性和迁移性,从而使它们的生物可利用性大大提高。生物体吸收这类金属后,可与体内的物质发生反应,形态发生变化,毒性增强。在以后的研究中,除了持续跟踪调查这三种金属在环境中的含量水平以外,还应加强研究这三种金属在环境中的颗粒分布、迁移转化、形态变换、生物可利用性以及生物毒性等,使我们能够更好地评估其生态健康风险,并为与之相关的应用研发、防范措施、政策制订提供引导和支持。  相似文献   
124.
    
Abstract

The paper demonstrates why it is necessary to take the restoration of marine coastal ecosystem health as a new goal for integrated catchment management, in coastal area of the Tolo Harbour. The present goal of integrated catchment management (ICM) in the Tolo Harbour is to meet with Water Quality Objectives. The performance of an ICM plan, Tolo Harbour Action Plan (THAP), is evaluated by using marine coastal ecosystem health indicators including stress indicators and responses indicators. Since the implementation of THAP in 1988, some significant reduction in pollution loading has been observed—reduction of 83% of BOD load and 82% of TN between 1988 and 1999. There has been an improvement in the health state of Tolo Harbour marine coastal ecosystem as evidenced in the trends of the physical, chemical and biological indicators, although some reverse fluctuations in some periods exist. However, this can only be considered as the first sign of the ecosystem health restoration, since ecosystem health covers not only physical, chemical and biological aspects of an ecosystem, but also ecosystem-service-function aspect. It is recommended to take the restoration and protection of marine coastal ecosystem health as a new goal, instead of water quality objective management, for integrated catchment management in Tolo Harbour catchment. Steps to further improve the marine coastal ecosystem health of Tolo harbour are discussed in the paper.  相似文献   
125.
结合对“社会弱势群体”含义、产生原因的分析以及对我国社会弱势群职业卫生与安全法律保护现状的总结,本文指出了法律对社会弱势群体职业卫生与安全给予倾斜性保护的重要意义,并进一步提出了加强对社会弱势群体职业卫生与安全法律保护具体措施的设想。  相似文献   
126.
    
On-going population growth and resulting domestic demand for water require rapid and effective decision-making as regards groundwater management and control of the various sources of salinization and pollution in Coastal aquifers. Sustainability of water resources for utilization by future generations must therefore be a high priority, not only for the purpose of fulfilling needs for water usage but also for bringing people into harmony with their ambient natural environment.The objective of this paper is to propose an empirical approach for prioritization of the needs involved for sustainable aquifer management. The approach involves a schematic format to:(1) develop a global understanding of an aquifer's hydrological and environmental properties in order to delineate appropriate eco-hydrological scenarios and recommend corresponding operational management activities; and(2) emphasize the importance of educating and increasing the awareness of the population involved as to the need for and viability of socially acceptable measures for sustainable management of groundwater and other resources.The psychologist Abraham Maslow utilized a pyramid to illustrate that until people's most basic needs were fulfilled, higher levels of needs would remain irrelevant. This paper postulates a comparable pyramid prioritizing hydrological needs required for progressing towards sustainable groundwater resources. Two sub-regions of Israel's Coastal aquifer in the Sharon region have been presented as representative areas, each characterized by different stress of exploitation. In assessing these sub-regions situation, specific measures have been recommended for achieving and/or maintaining sustainable groundwater resources in light of the ambient environment, and the level of the population on the pyramidal hierarchy of groundwater needs.  相似文献   
127.
Objective: This study evaluated the effectiveness of a series of 1-year multifaceted school-based programs aimed at increasing booster seat use among urban children 4–7 years of age in economically disadvantaged areas.

Methods: During 4 consecutive school years, 2011–2015, the Give Kids a Boost (GKB) program was implemented in a total of 8 schools with similar demographics in Dallas County. Observational surveys were conducted at project schools before project implementation (P0), 1–4 weeks after the completion of project implementation (P1), and 4–5 months later (P2). Changes in booster seat use for the 3 time periods were compared for the 8 project and 14 comparison schools that received no intervention using a nonrandomized trial process.

The intervention included (1) train-the-trainer sessions with teachers and parents; (2) presentations about booster seat safety; (3) tailored communication to parents; (4) distribution of fact sheets/resources; (5) walk-around education; and (6) booster seat inspections.

The association between the GKB intervention and proper booster seat use was determined initially using univariate analysis. The association was also estimated using a generalized linear mixed model predicting a binomial outcome (booster seat use) for those aged 4 to 7 years, adjusted for child-level variables (age, sex, race/ethnicity) and car-level variables (vehicle type). The model incorporated the effects of clustering by site and by collection date to account for the possibility of repeated sampling.

Results: In the 8 project schools, booster seat use for children 4–7 years of age increased an average of 20.9 percentage points between P0 and P1 (P0 = 4.8%, P1 = 25.7%; odds ratio [OR] = 6.9; 95% confidence interval [CI], 5.5, 8.7; P < .001) and remained at that level in the P2 time period (P2 = 25.7%; P < .001, for P0 vs. P2) in the univariate analysis. The 14 comparison schools had minimal change in booster seat use. The multivariable model showed that children at the project schools were significantly more likely to be properly restrained in a booster seat after the intervention (OR = 2.7; 95% CI, 2.2, 3.3) compared to the P0 time period and compared to the comparison schools.

Conclusion: Despite study limitations, the GKB program was positively associated with an increase in proper booster seat use for children 4–7 years of age in school settings among diverse populations in economically disadvantaged areas. These increases persisted into the following school year in a majority of the project schools. The GKB model may be a replicable strategy to increase booster seat use among school-age children in similar urban settings.  相似文献   

128.

Problem

Falls in older persons in developing countries are poorly understood, and falls prevention and health promotion programmes for this population are largely lacking.

Methods

A systematic review was carried out of relevant literature on falls and prevention programmes, and falls prevention education, and a scan undertaken of health promotion programmes for older persons in a representative country - South Africa.

Results

Studies on the risk and prevalence of falls are largely retrospective and hospital-based, with varied methodology, including study period, sampling method and sample size. Falls prevalence is based largely on self-reports in studies on general trauma in all age groups. Falls incidence varies from 10.1% to 54%. No reports could be traced on sustained falls prevention or health promotion programmes.

Conclusion

Scant research has been conducted and little preventive education offered on falls in older persons. Adaptation of the Canadian Falls Prevention Curriculum for developing countries will help to fill gaps in knowledge and practice.

Impact on industry

With rapid increase in the populations of older persons in developing countries, research on age related disorders such as falls is required to guide policy and management of falls.  相似文献   
129.
    
Introduction. The aim of this study was to evaluate the trend of occupational injuries in Turkey using epidemiologic criteria such as incidence mortality and fatality/all injuries recorded – rates. Materials and methods. Safety and health data were obtained from the Annual Statistic Books of the Social Insurance Institution (1988–2006) and Social Security Institution (2007–2011) of Turkey. Results. The results from the official data showed that although total employment is increasing the number of occupational injuries and incidence and mortality rates are decreasing. The results also demonstrate that occupational fatality/all injuries recorded – rate is increasing. The fatality/all injuries recorded – rate per 1000 injuries increased to 25.5 in 2011 from 8.6 in 1988. Each work day an average of five people died because of occupational injuries. Discussion and conclusions. The fatality/all injuries recorded – rate (the number of fatal cases per 1000 occupational injuries) is an important indicator of the injury rate for a country. Systems of occupational injury and illness surveillance constitute a critical resource for the management and reduction of occupational injuries and illness.  相似文献   
130.
为了评价新民柳河水源地的供水安全,简要介绍水环境健康风险评价基本方法的基础上,建立了水环境健康风险评价模式.研究结果表明:①柳河水源地地面水基因毒物质为优先控制污染物;而地下水应着力控制躯体毒物质.②对于基因毒物质,监测断面优先控制污染物为As和Cr;而对于躯体毒物质,所有监测断面的优先控制污染物均为氨.③在所有监测断面中,柳河上断面等6处有毒污染物所致健康危害的个人年总风险数量级为10-5-10-4.在日后的管理过程中,应对这6处加大治理力度.④目前环境健康风险评价还没有包括在常规环境评价工作中,建议在今后的评价工作中应该逐步开展这方面的工作,以提高供水安全.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号