全文获取类型
收费全文 | 2446篇 |
免费 | 194篇 |
国内免费 | 829篇 |
专业分类
安全科学 | 443篇 |
废物处理 | 23篇 |
环保管理 | 377篇 |
综合类 | 1396篇 |
基础理论 | 599篇 |
环境理论 | 6篇 |
污染及防治 | 181篇 |
评价与监测 | 164篇 |
社会与环境 | 174篇 |
灾害及防治 | 106篇 |
出版年
2024年 | 33篇 |
2023年 | 111篇 |
2022年 | 118篇 |
2021年 | 137篇 |
2020年 | 116篇 |
2019年 | 136篇 |
2018年 | 136篇 |
2017年 | 145篇 |
2016年 | 190篇 |
2015年 | 137篇 |
2014年 | 135篇 |
2013年 | 281篇 |
2012年 | 183篇 |
2011年 | 203篇 |
2010年 | 141篇 |
2009年 | 160篇 |
2008年 | 112篇 |
2007年 | 156篇 |
2006年 | 134篇 |
2005年 | 99篇 |
2004年 | 88篇 |
2003年 | 97篇 |
2002年 | 73篇 |
2001年 | 57篇 |
2000年 | 48篇 |
1999年 | 30篇 |
1998年 | 26篇 |
1997年 | 23篇 |
1996年 | 19篇 |
1995年 | 19篇 |
1994年 | 24篇 |
1993年 | 15篇 |
1992年 | 8篇 |
1991年 | 4篇 |
1990年 | 7篇 |
1989年 | 4篇 |
1988年 | 8篇 |
1987年 | 4篇 |
1985年 | 3篇 |
1984年 | 3篇 |
1983年 | 6篇 |
1982年 | 2篇 |
1981年 | 9篇 |
1980年 | 6篇 |
1979年 | 4篇 |
1978年 | 2篇 |
1977年 | 4篇 |
1974年 | 3篇 |
1973年 | 2篇 |
1972年 | 3篇 |
排序方式: 共有3469条查询结果,搜索用时 15 毫秒
41.
Inspired by the phenomenon of heavy reduction in the area of cultivated land following the entry of Korea and Japan to the WTO,countries with a large population and inadequate amount of cultivated land similar to China,this paper raises the problem of the potential effects on cultivated land in China following its entry to the WTO.The paper attempts analysis,using economic principles,of the effects of Chinese WTO membership on cultivated land from four aspects;tariff concessions,quota increment,comparative advantage,and the substitution principle.And the conclusion is mat China's entry to WTO may lead to a reduction in cultivated land.Finally,some countermeasures are proposed to resolve the problem. 相似文献
42.
Anna Giovanetti Sergey Fesenko Lisbet D. Asencio 《Journal of environmental radioactivity》2010,101(6):509-516
The accumulations of both natural (U) and depleted (DU) uranium in the earthworms (Eisenia fetida) were studied to evaluate corresponding biological effects. Concentrations of metals in the experimental soil ranged from 1.86 to 600 mg kg−1. Five biological endpoints: mortality, animals’ weight increasing, lysosomal membrane stability by measuring the neutral red retention time (the NRRT), histological changes and genetic effects (Comet assay) were used to evaluate biological effects in the earthworms after 7 and 28 days of exposure. No effects have been observed in terms of mortality or weight reduction. Cytotoxic and genetic effects were identified at quite low U concentrations. For some of these endpoints, in particular for genetic effects, the dose (U concentration)-effect relationships have been found to be non-linear. The results have also shown a statistically significant higher level of impact on the earthworms exposed to natural U compared to depleted U. 相似文献
43.
工业化快速进程中.工业污染作为工业生产在所难免的附属产物.占全国总污染负荷的70%.对资源环境构成巨大压力。经济发达地区工业产值占据了国民经济的半壁江山.使得工业结构与布局成为影响生态环境质量的主要驱动因子。本文首先以江苏省为例.分析重污染行业结构与工业布局变动对环境效应的实际效果.得出重要结论:自1990年以来工业结构与布局调整不利于环境污染控制。从生产效应和社会效应两个方面.分析工业化进程中的环境效应影响机理.通过对江苏省的实证分析.结果证实工业结构与布局是现阶段景影响环境污染的重要变量。重污染行业结构是环境效应的主要影响因素。加快工业结构调整步伐、进一步优化工业布局.着力于从工业结构调整和工业布局变动趋势中获得改善环境质量的机遇和动力是摆脱环境与发展困境的有力手段。 相似文献
44.
45.
We undertake three objectives in this Incubator. We begin with a discussion of how well‐being has been considered in organizational research. Second, we provide an overview of the relationship between employee well‐being and such workplace outcomes as job performance, employee retention, and cardiovascular health. Third, we introduce exciting research directions. Copyright © 2012 John Wiley & Sons, Ltd. 相似文献
46.
基于三角随机模拟和ArcGIS的河流水环境健康风险评价模型 总被引:1,自引:0,他引:1
基于河流水环境系统中随机性、模糊性等多种不确定性共存或交叉存在的特性,将三角模糊数与随机模拟方法相耦合,构建了三角随机模拟模型,并将其应用到湘江(长沙段)的健康风险评价中。通过将各参数浓度进行三角模糊化和随机模拟,结果表明,各断面污染物造成的健康风险的变化趋势,总体沿湘江上游至下游逐步降低,表现为昭山 > 猴子石 > 五一桥 > 橘子洲 > 乔口 > 三汊矶,且昭山、三汊矶断面和乔口断面均有恶化趋势。相对于常规的确定性方法,本模型能够得出评价区域健康风险的可能值区间及其相应的概率水平等定量信息,更加客观、全面地表征评价区域的风险状态及其空间分布差异,为决策者提供更多有用的信息。 相似文献
47.
为评估煤电行业从业人员因遭受职业危害暴露引起的健康负担大小,根据工作暴露矩阵法对燃煤发电职业暴露程度进行估算,利用健康效应分析和伤残调整寿命年指标构建燃煤发电职业暴露健康负担评价体系,实现职业暴露健康负担的量化评价。将所构建的评价体系应用于3个燃煤电厂进行对比分析,结果表明:各类危害因素中,粉尘所致健康危害最大,人均健康负担约为8.861 a;各生产环节中,运输煤系统所致健康影响最大,约占整个生产过程的45.53%。 相似文献
48.
安全生产标准是规范企业安全生产工作的基础性规范,是安全生产法律体系的重要组成部分,也是安全生产监管监察执法的重要依据。为掌握安全生产标准现状,收集、梳理了已发布的安全生产标准603项和正在研制阶段的标准385项,对标准发布年份、在研标准计划年份、标准领域分布、标准级别和标准性质多个维度进行分析,总结标准工作存在的问题,提出安全生产标准制(修)订及发展建议,为安全生产标准工作的持续完善提供参考。 相似文献
49.
Magdalena Woynarowska-Sołdan Lucyna Iwanow Aleksander Zarzeka Joanna Gotlib 《International journal of occupational safety and ergonomics》2019,25(1):76-85
Purpose. The aim was to adjust the positive health behaviours scale (PHBS) to make it suitable for use by nurses, and to validate the new version of the tool. Methods. A previously formulated PHBS was modified. The scale comprises 29 statements describing certain positive health behaviours in four subscales: nutrition, physical activity, relaxation and behaviours related to mental health, and preventive behaviours. The scale was enriched with items on avoiding risky behaviours and a question regarding respondents’ own assessment of their care for health. Analyses were conducted of reliability, construct validity, criterion validity and dimensionality of subscales. The questionnaire was completed by 1017 nurses. Results. Cronbach's α reached 0.844 for the entire scale and 0.623–0.761 for specific subscales. Empirical data did not confirm theoretical assumptions regarding the existence of a four-element structure of the PHBS. The scale's diagnostic criteria were validated on the basis of positive results of correlation and trend analysis. Only one of the subscales proved homogeneous and could be considered unidimensional. Conclusions. The results confirmed the high internal consistency of the scale and its subscales. The factor structure of the PHBS was equivocal. The PHBS could be used in workplace-based health promotion programmes designed for nurses. 相似文献
50.
Selim Baradan Ozge Akboga Kale 《International journal of occupational safety and ergonomics》2019,25(1):40-50
The International Labour Organization (ILO) reports that the risk of fatal occupational injuries in developing countries is almost twice as high as in developed countries, indicating a potential relationship between the fatality rates and the development level. The human development index (HDI), based on life expectancy, knowledge level and purchasing power parity, endorsed by the United Nations Development Programme, is a widely accepted measure of the development level. This study investigates the relationship between the HDI and the fatality rates reported by the ILO. A 23-country data set is used to demonstrate the general trend of the relationship followed by country-specific analyses for Australia, Spain, Hungary and Turkey. The study conducted is limited to fatal occupational injuries in construction, where the accidents are notoriously high. The results demonstrate a statistically significant inverse relationship between the fatality rates and the HDI. 相似文献