全文获取类型
收费全文 | 170篇 |
免费 | 25篇 |
国内免费 | 15篇 |
专业分类
安全科学 | 19篇 |
废物处理 | 6篇 |
环保管理 | 27篇 |
综合类 | 83篇 |
基础理论 | 20篇 |
污染及防治 | 11篇 |
评价与监测 | 27篇 |
社会与环境 | 3篇 |
灾害及防治 | 14篇 |
出版年
2024年 | 1篇 |
2023年 | 6篇 |
2022年 | 6篇 |
2021年 | 7篇 |
2020年 | 5篇 |
2019年 | 6篇 |
2018年 | 4篇 |
2017年 | 8篇 |
2016年 | 8篇 |
2015年 | 10篇 |
2014年 | 12篇 |
2013年 | 14篇 |
2012年 | 13篇 |
2011年 | 21篇 |
2010年 | 10篇 |
2009年 | 10篇 |
2008年 | 7篇 |
2007年 | 9篇 |
2006年 | 7篇 |
2005年 | 10篇 |
2004年 | 1篇 |
2003年 | 5篇 |
2002年 | 3篇 |
2001年 | 4篇 |
2000年 | 2篇 |
1999年 | 2篇 |
1998年 | 1篇 |
1997年 | 4篇 |
1996年 | 3篇 |
1995年 | 3篇 |
1994年 | 2篇 |
1993年 | 2篇 |
1984年 | 1篇 |
1972年 | 2篇 |
1970年 | 1篇 |
排序方式: 共有210条查询结果,搜索用时 15 毫秒
111.
Grzegorz Gralewicz Grzegorz Owczarek 《International journal of occupational safety and ergonomics》2016,22(3):305-309
The paper analyses the selected optical parameters of protective optic filters used for protection of the eyes against hazardous radiation within the visible (VIS) and near infrared (NIR) spectrum range. The indexes characterizing transmission and reflection of optic radiation incident on the filter are compared. As it follows from the completed analysis, the newly developed interference filters provide more effective blocking of infrared radiation in comparison with the currently used protective filters. 相似文献
112.
Despite the enormous infusion of post‐quake aid to Haiti, cholera had killed more than 8,000 people by January 2013. Based on two mixed‐method studies of a random sample of 108 internally displaced person (IDP) camps and 168 interviews with agency representatives and recipients, this article examines the prevalence of factors that have proven most relevant to the rapid spread of cholera, particularly the provision of water and sanitation services in IDP camps. The study reveals that 30% of IDP camps had no toilets and 40% had no access to water before the outbreak, with only minimal progress after three months. Using bivariate and multivariate statistical analyses, this article explores patterns in the gaps of services with a range of variables such as NGO camp management, municipality and landowners. It offers several theoretical and policy explanations for low level of services, concluding with a series of recommendations for better coordination and management. 相似文献
113.
本文简要介绍了可靠性强化试验技术原理与特点,总结了可靠性强化试验技术在家电产品研发阶段中的应用方法,详细阐述了可靠性强化试验过程和试验剖面特点;给出了部分产品实施可靠性强化试验的结果与实施经验,论述了如何在家电产品中经济高效地实施可靠性强化试验技术. 相似文献
114.
Several immunosuppressive factors are associated with parasitism of an endoparasitoid wasp, Cotesia plutellae, on the diamondback moth, Plutella xylostella. C. plutellae bracovirus (CpBV) encodes a large number of putative protein tyrosine phosphatases (PTPs), which may play a role in inhibiting
host cellular immunity. To address this inhibitory hypothesis of CpBV-PTPs, we performed transient expression of individual
CpBV-PTPs in hemocytes of the beet armyworm, Spodoptera exigua, and analyzed their cellular immune responses. Two different forms of CpBV-PTPs were chosen and cloned into a eukaryotic
expression vector under the control of the p10 promoter of baculovirus: one with the normal cysteine active site (CpBV-PTP1)
and the other with a mutated active site (CpBV-PTP5). The hemocytes transfected with CpBV-PTP1 significantly increased in
PTP activity compared to control hemocytes, but those with CpBV-PTP5 exhibited a significant decrease in the PTP activity.
All transfected hemocytes exhibited a significant reduction in both cell spreading and encapsulation activities compared to
control hemocytes. Co-transfection of CpBV-PTP1 together with its double-stranded RNA reduced the messenger RNA (mRNA) level
of CpBV-PTP1 and resulted in recovery of both hemocyte behaviors. This is the first report demonstrating that the polydnaviral
PTPs can manipulate PTP activity of the hemocytes to interrupt cellular immune responses. 相似文献
115.
116.
117.
118.
环境激素的内分泌干扰机制及其对人体的影响 总被引:6,自引:0,他引:6
环境激素问题的调查研究标志着地球环境时代的到来。重点讨论了环境激素的分类、特征及其内分泌干扰机制,并涉及了环境激素对人体的影响,以期引起人们的关注和重视,加强这方面的调查研究。 相似文献
119.
浅析我国的环境问责制 总被引:1,自引:0,他引:1
环境问责制的确立以《环境保护违法违纪行为处分暂行规定》的出台为标志。在整顿重大环境事件的背景条件下,环境问责因社会转型、政府责任和企业环境责任强化而具有独特的特点,在环境问责的基本建构上,对环境问责的配套制度建设提出初步设想。 相似文献
120.
自振柱试验是测量土样动剪切模量和阻尼比的常用方法,但由于噪声等环境因素的影响,土样扭剪自由振动的衰减波曲线有时会因高频干扰出现不平滑现象,难以得到合理的测试结果。软件数字滤波是解决这类问题的有效方法。本文通过多种软件数字滤波方法优缺点的对比,认为平均滤波法和惯性滤波法能有效解决试验数据中的高频干扰问题,并分别选择适当的滤波参数,得到了平滑的自振衰减波曲线;最后,采用平均滤波法处理了两组自振柱试验数据。结果表明,软件滤波法确能有效消除不合理数据,得到符合一般规律的土体动剪切模量和阻尼比试验结果,从而验证了其在土体自振柱试验中的应用价值。 相似文献