全文获取类型
收费全文 | 885篇 |
免费 | 43篇 |
国内免费 | 13篇 |
专业分类
安全科学 | 38篇 |
废物处理 | 32篇 |
环保管理 | 205篇 |
综合类 | 106篇 |
基础理论 | 294篇 |
环境理论 | 1篇 |
污染及防治 | 180篇 |
评价与监测 | 43篇 |
社会与环境 | 30篇 |
灾害及防治 | 12篇 |
出版年
2023年 | 8篇 |
2022年 | 21篇 |
2021年 | 17篇 |
2020年 | 25篇 |
2019年 | 20篇 |
2018年 | 29篇 |
2017年 | 48篇 |
2016年 | 32篇 |
2015年 | 34篇 |
2014年 | 35篇 |
2013年 | 80篇 |
2012年 | 52篇 |
2011年 | 65篇 |
2010年 | 49篇 |
2009年 | 38篇 |
2008年 | 46篇 |
2007年 | 47篇 |
2006年 | 39篇 |
2005年 | 25篇 |
2004年 | 25篇 |
2003年 | 26篇 |
2002年 | 20篇 |
2001年 | 16篇 |
2000年 | 10篇 |
1999年 | 13篇 |
1998年 | 9篇 |
1997年 | 17篇 |
1996年 | 8篇 |
1995年 | 11篇 |
1994年 | 6篇 |
1993年 | 4篇 |
1992年 | 4篇 |
1991年 | 5篇 |
1990年 | 8篇 |
1989年 | 7篇 |
1987年 | 6篇 |
1986年 | 5篇 |
1985年 | 3篇 |
1984年 | 2篇 |
1983年 | 5篇 |
1982年 | 6篇 |
1981年 | 1篇 |
1980年 | 2篇 |
1979年 | 2篇 |
1977年 | 2篇 |
1976年 | 2篇 |
1972年 | 1篇 |
1971年 | 1篇 |
1968年 | 1篇 |
1966年 | 2篇 |
排序方式: 共有941条查询结果,搜索用时 656 毫秒
861.
This study investigated the effects of individuals' affective traits (i.e., affect intensity and affect disposition) and affective states (i.e., positive and negative mood) on their motivations and behavior during episodes of organizational conflict. Two hundred and twenty‐three student employees from a variety of jobs and organizations kept daily records, for a three day period, of their conflict experiences at work. The results of hierarchical linear modelling indicated that employees' affective traits and affective states had parallel effects on the conflict management process. Subsequent analyses revealed the source of this parallelism: employees' moods on the day of the conflict fully mediated the effects of their affective disposition on the conflict process variables. The results are discussed in terms of their theoretical significance and practical implications. Copyright © 2001 John Wiley & Sons, Ltd. 相似文献
862.
Jonathan D. Sime 《Journal of environmental psychology》1983,3(1):21-41
Two models of escape behaviour are contrasted in an analysis of flight from a fire by 128 people in a public building. The ‘panic’ model assumes that escape involves a homogeneous population of individuals concerned with self-preservation, competing with each other for limited exits. The ‘affiliative’ model2 predicts individuals with close psychological ties will attempt to escape in groups of two or more; flight is assumed to involve escape to familiar persons and places. Causal loglinear analysis was used to model the inter-relationships between four variables in a 2 × 2 × 3 × 2 cross-classified categorical table: (A) Group Membership (family/mixed); (B) Group Attachment at Cue (attached/separated); (C) Cue (ambiguous/verbal/unambiguous); (D) Group Affiliation at Exit (affiliated/separated). Associations were found between [BC] and [ABD] indicating strong support for model. In a situation of potential danger ‘separated’ individuals responded more often to ‘ambiguous’ cues. ‘Family’ members who were attached at cue were most likely to be together and ‘mixed’ group members apart when exiting from the building. Family members tried to adopt an optimal strategy for group rather than individual survival. 相似文献
863.
Dr. Waldo Sepulveda Konstantinos D. Stagiannis Phillip M. Cox Jonathan S. Wigglesworth Nicholas M. Fisk 《黑龙江环境通报》1995,15(7):660-664
Amyoplasia is a rare, sporadic condition characterized by different degrees of maldevelopment of the skeletal muscles, which are replaced by fibrous and fatty tissue. In this report, we present a case of generalized amyoplasia presenting at 19 weeks' gestation. The most striking finding was the absence of fetal movements, resulting in severe multiple congenital contractures, hydrops, and polyhydramnios. At autopsy, histological examination of the skeletal muscle showed small groups of poorly developed fibres within areas of fat. This report suggests that generalized amyoplasia could be a common cause of severe forms of multiple congenital contractures, but is probably underdiagnosed at post-mortem because of inadequate examination of muscles. Definitive diagnosis is important in determining the risks of recurrence in these cases. 相似文献
864.
865.
866.
In several species of ants, queens often form temporary cooperative associations during colony foundation. These associations
end soon after the eclosion of the first workers with the death or expulsion of all but one of the queens. This study examined
competition between foundress queens of the fire ant Solenopsis invicta. Although attacks by the workers contributed to queen mortality, queens gained no advantage by producing more workers than
their co-foundresses. Restriction fragment length polymorphism analysis of mitochondrial DNA showed that the queen producing
more workers during colony founding was no more likely to survive than the less productive queen. In experimentally manipulated
colonies in which all the workers were daughters of only one of the queens, the mother of the workers was no more likely to
survive than the unrelated queen. Queens producing diploid males reared fewer offspring but were as likely to survive as queens
producing only workers. These results suggest that workers do not discriminate between related and unrelated queens within
colonies. Aggressive encounters between queens were common. Queens were more likely to die or be expelled if paired with heavier
queens or if they lost more weight than their co-foundress during the claustral period. Finally, when queens were separated
by screens through which workers could pass, the workers usually attacked and killed the queen farther from the brood. These
results suggest that queen survival is promoted by a high fighting ability relative to co-foundresses, rather than by increased
worker production, and that workers respond to queen differences that are independent of kinship.
Received: 8 September 1995/Accepted after revision: 5 March 1996 相似文献
867.
C.E. Adams 《Environment international》1982,7(4):293-303
Methods of handling sludges generated from normal refinery operations are evaluated to determine the costs of alternative disposal methodologies. Sludges generated from several areas in the refinery are classified as (1) sludges from which oils may be recovered; (2) other oily sludges from which oils cannot be recovered; and (3) biological sludges. Methodologies for handling these sludges are reviewed based on previous experience. The economics of handling a representative combination of biological and oily sludges from the refinery are evaluated considering three disposal options: Alternative I in which the sludge would be dewatered using pressure filtration followed by landfill disposal of the sludge cake; Alteration II in which vacuum filtration was employed for sludge dewatering followed by sludge disposal in a landfill; and Alternative III in which the sludges were disposed of by landfarming. Costs are presented for centrifugation of oily sludges and incineration as a final disposal alternative. 相似文献
868.
Representative estuarine-marine microcosms were reviewed and evaluated to provide recommendations and guidance for use in assessing effects of perturbations on coastal zone ecosystems. Properly designed marine microcosms can be effective assessment tools for evaluating the effects of stresses on coastal ecosystems. Critical design considerations include scaling of important physical factors, such as turnover rate and circulation, inclusion of appropriate trophic groups, minimization of side growth, and maintenance of realistic nutrient regimes. Selection of communities or major components to be included in design of microcosms should be based on the experimental hypothesis, ecologically and economically important organisms, ability to interpret test results, difficulties involved in scaling, and sensitivity of the community to the stress being investigated. In selection of response parameters, emphasis should be placed on key ecological components, particle size distribution, and those variables that reflect aggregate responses at the population or community level. 相似文献
869.
870.
David Adams 《Journal of Environmental Planning and Management》1987,30(2):66-69
Much has been written on public participation in local planning but very little on the involvement of landowners. This is despite the clear financial motives which encourage many landowners to participate in the local planning process. The paper demonstrates how in one case in West Yorkshire, an important historic landowner was able to exert a substantial influence on the pattern of land use allocations in an adopted local plan. Although the particular characteristics of the case study may not be found elsewhere, it helps to identify how more substantial research in this often neglected area might proceed. 相似文献