全文获取类型
收费全文 | 532篇 |
免费 | 80篇 |
国内免费 | 75篇 |
专业分类
安全科学 | 183篇 |
废物处理 | 1篇 |
环保管理 | 74篇 |
综合类 | 191篇 |
基础理论 | 177篇 |
污染及防治 | 12篇 |
评价与监测 | 9篇 |
社会与环境 | 30篇 |
灾害及防治 | 10篇 |
出版年
2024年 | 3篇 |
2023年 | 32篇 |
2022年 | 29篇 |
2021年 | 43篇 |
2020年 | 34篇 |
2019年 | 30篇 |
2018年 | 15篇 |
2017年 | 30篇 |
2016年 | 30篇 |
2015年 | 30篇 |
2014年 | 17篇 |
2013年 | 21篇 |
2012年 | 28篇 |
2011年 | 43篇 |
2010年 | 39篇 |
2009年 | 37篇 |
2008年 | 33篇 |
2007年 | 36篇 |
2006年 | 37篇 |
2005年 | 23篇 |
2004年 | 13篇 |
2003年 | 16篇 |
2002年 | 17篇 |
2001年 | 5篇 |
2000年 | 5篇 |
1999年 | 8篇 |
1998年 | 5篇 |
1997年 | 3篇 |
1996年 | 2篇 |
1995年 | 3篇 |
1994年 | 3篇 |
1993年 | 3篇 |
1991年 | 1篇 |
1990年 | 1篇 |
1989年 | 2篇 |
1988年 | 2篇 |
1987年 | 1篇 |
1985年 | 2篇 |
1978年 | 2篇 |
1977年 | 1篇 |
1975年 | 1篇 |
1973年 | 1篇 |
排序方式: 共有687条查询结果,搜索用时 15 毫秒
501.
In this paper, a simple model for analysing variability in radon concentrations in homes is tested. The approach used here involves two error components, representing additive and multiplicative errors, together with variation between-houses. We use a Bayesian approach for our analysis and apply this model to two datasets of repeat radon measurements in homes; one based on 3-month long measurements for which the original measurements were close to the current UK Radon Action Level (200 Bq m−3), and the other based on 6-month measurement data (from regional and national surveys), for which the original measurements cover a wide range of radon concentrations, down to very low levels. The model with two error components provides a better fit to these datasets than does a model based on solely multiplicative errors. 相似文献
502.
A process-convolution approach to modelling temperatures in the North Atlantic Ocean 总被引:3,自引:0,他引:3
David Higdon 《Environmental and Ecological Statistics》1998,5(2):173-190
This paper develops a process-convolution approach for space-time modelling. With this approach, a dependent process is constructed by convolving a simple, perhaps independent, process. Since the convolution kernel may evolve over space and time, this approach lends itself to specifying models with non-stationary dependence structure. The model is motivated by an application from oceanography: estimation of the mean temperature field in the North Atlantic Ocean as a function of spatial location and time. The large amount of this data poses some difficulties; hence computational considerations weigh heavily in some modelling aspects. A Bayesian approach is taken here which relies on Markov chain Monte Carlo for exploring the posterior distribution. 相似文献
503.
比较了流速法和坡度法两种常用污水管网优化设计程序在不同地形条件下的应用效果.结果表明,在地形较为平缓地区,两者均能得到较好的结果,其中流速法在埋深上更具优势;而在地形较陡地区,坡度法能充分利用有利地形控制埋深和坡度,优化设计效果较好. 相似文献
504.
505.
李红卫 《城市环境与城市生态》1999,12(5):41-42
本文简要介绍了PTP网络系统的组成,并结合开发中心的实际情况详细说明了CAD系统在环境工程设计中的具体应用。 相似文献
506.
507.
基于贝叶斯公式的湖泊富营养化随机评价方法及其验证 总被引:29,自引:0,他引:29
为了准确评价湖泊所处的营养状态,进而为湖泊富营养化的防治提供科学依据,提出了基于贝叶斯公式的湖泊富营养化随机评价方法。该法通过计算单个水质指标属于某个评价级别的概率,由最大似然分类原则确定单个水质指标的评价级别,并采用加权平均法推求湖泊富营养化多个水质指标的综合评价级别,具有方法简单、计算工作量小的特点。经全国30个湖泊实测水质资料的验证,随机评价方法与模糊评价方法和灰色评价方法相比较,有29个湖泊评价结果的差异小于等于一个级别,其比例为96.6%,说明这三种富营养化评价方法的计算精度相当。根据各项评价指标与叶绿素的相关系数,计算各项水质指标在富营养化评价中所占权重的方法,适用于浮游植物型湖泊,如果采取等权重方法,则适用于任何类型的湖泊。确定湖泊富营养化评价的水质指标个数和种类的选择具有不确定性,确定湖泊富营养化的评价级别和各个级别对应的水质标准浓度也具有不确定性,因此湖泊富营养化的评价方法具有不确定性。应采用多种途径对湖泊富营养化的评价方法进行研究,并取长补短,使评价结果更趋合理。 相似文献
508.
509.
Barbara Almeida Souza Josianne Claudia Sales Rosa Pedro Bueno R. Campos Luis Enrique Sánchez 《Conservation biology》2023,37(4):e14094
Evaluating the outcomes and tracking the trajectory of biodiversity offsets is essential to demonstrating their effectiveness as a mechanism to conciliate development and conservation. We reviewed the literature to determine the principles that should underpin biodiversity offset planning and the criteria for offset evaluation at the project level. According to the literature, the core principles of equivalence, additionality, and permanence are used as criteria to evaluate conservation outcomes of offsets. We applied the criteria to evaluate offsets of a large iron ore mining project in the Atlantic Forest in Brazil. We examined equivalence in terms of the amount of area per biodiversity value affected and fauna and flora similarity, additionality in terms of landscape connectivity, and permanence in terms of guarantees to ensure protection and restoration offsets lasting outcomes. We found an offset ratio (amount of affected area:offset area) of 1:1.8 for forests and 1:2 for grasslands. Ecological equivalence (i.e., similarity between affected and offset areas) was found for forested areas, but not for ferruginous rupestrian grasslands or for fauna. Landscape metrics showed that connectivity improved relative to the preproject situation as a result of locating restoration offsets in the largest and best-connected forest patch. Permanence of offsets was addressed by establishing covenants and management measures, but financial guarantees to cover maintenance costs after mine closure were lacking. Offsets should be equivalent in type and size, provide conservation outcomes that would not be obtained without them (additionality), and be lasting (permanence). To monitor and evaluate offsets, it is necessary to determine how well these 3 principles are applied in the planning, implementation, and maintenance of offsets. Achieving measurable conservation outcomes from offsets is a long-term endeavor that requires sustained management support, and is information intensive. Thus, offsets require ongoing monitoring and evaluation as well as adaptive management. 相似文献
510.
利用稻/麦O3-FACE(Ozone-free air controlled enrichment)试验平台,以杂交籼稻汕优63(SY63)和常规籼稻扬稻6(YD6)两个耐性不同的水稻(Oryza sativa L.)品种为材料,根据净光合速率和叶绿素荧光参数指标,研究分蘖期和抽穗期增施氮(N)肥对O3胁迫导致的水稻光合损伤的缓解作用。结果表明:(1)增施N肥可以减轻O3对SY63和YD6净光合速率(Pn)的影响,且前期增施N肥效果更显著。(2)O3升高条件下SY63和YD6的最大光量子效率(Fv/Fm)、实际光量子效率(ΦPSⅡ)和光化学猝灭(qP)有下降趋势,PSⅡ所吸收光能用于光化学部分(P%)减少,热耗散部分(D%)增加;提高施N量可减小O3引起的叶绿素荧光参数的变化幅度,有利于提高光合效率,其中增施分蘖肥的效果较理想。(3)大气O3体积分数升高会降低SY63和YD6的N素总积累量,增施N肥后有上升趋势,且前期施N肥增幅较大。总之增施氮肥在一定程度上可缓解O3对SY63和YD6的光合损伤,且在水稻生长前期增施效果更好。 相似文献