全文获取类型
收费全文 | 924篇 |
免费 | 17篇 |
国内免费 | 11篇 |
专业分类
安全科学 | 45篇 |
废物处理 | 52篇 |
环保管理 | 205篇 |
综合类 | 123篇 |
基础理论 | 245篇 |
环境理论 | 5篇 |
污染及防治 | 161篇 |
评价与监测 | 77篇 |
社会与环境 | 34篇 |
灾害及防治 | 5篇 |
出版年
2023年 | 8篇 |
2022年 | 9篇 |
2021年 | 15篇 |
2020年 | 12篇 |
2019年 | 14篇 |
2018年 | 20篇 |
2017年 | 25篇 |
2016年 | 37篇 |
2015年 | 31篇 |
2014年 | 32篇 |
2013年 | 91篇 |
2012年 | 47篇 |
2011年 | 61篇 |
2010年 | 37篇 |
2009年 | 51篇 |
2008年 | 40篇 |
2007年 | 34篇 |
2006年 | 48篇 |
2005年 | 28篇 |
2004年 | 30篇 |
2003年 | 26篇 |
2002年 | 30篇 |
2001年 | 13篇 |
2000年 | 17篇 |
1999年 | 16篇 |
1998年 | 11篇 |
1997年 | 14篇 |
1996年 | 6篇 |
1995年 | 10篇 |
1994年 | 8篇 |
1993年 | 14篇 |
1992年 | 11篇 |
1991年 | 10篇 |
1990年 | 7篇 |
1989年 | 4篇 |
1988年 | 9篇 |
1987年 | 6篇 |
1986年 | 8篇 |
1985年 | 5篇 |
1984年 | 4篇 |
1983年 | 5篇 |
1982年 | 10篇 |
1981年 | 5篇 |
1980年 | 7篇 |
1979年 | 3篇 |
1978年 | 6篇 |
1976年 | 2篇 |
1974年 | 4篇 |
1972年 | 2篇 |
1956年 | 1篇 |
排序方式: 共有952条查询结果,搜索用时 125 毫秒
941.
Dharmaratne Amarakoon Anthony Chen Sam Rawlins Dave D. Chadee Michael Taylor Roxann Stennett 《Mitigation and Adaptation Strategies for Global Change》2008,13(4):341-357
The seasonality, patterns and the climate associations of the reported cases of dengue in the Caribbean were studied by analyzing the annual and monthly variability of reported cases as well as those of climate parameters (temperature and precipitation). More attention was given to Trinidad and Tobago, Barbados, and Jamaica, as those countries contributed mostly to the reported cases. The data were for the period 1980–2003. Results showed that the incidence of dengue in the Caribbean were higher in the last decade (1990s) compared to that in the previous decade (1980s). The yearly patterns of dengue exhibited a well-defined seasonality. The epidemics appeared to occur in the later half of the year following onset of rainfall and increasing temperature. Analysis revealed that the association of the epidemics with temperature was stronger, especially in relation to the onset of dengue, and the probability of epidemics was high during El Niño periods. In years with early warmer periods epidemics appeared to occur early, which was a scenario more probable in the year after an El Niño (an El Niño + 1 year). Indices linked to temperatures that are useful for gauging the potential for onset of dengue were examined. An index based on a moving average temperature (MAT) appeared to be effective in gauging such potential and its average (AMAT) signals a threshold effect. MAT index has potential use in adaptation and mitigation strategies. 相似文献
942.
Sivak M Luoma J Flannagan MJ Bingham CR Eby DW Shope JT 《Journal of Safety Research》2007,38(3):337-355
INTRODUCTION: This article examines five major road-safety risk factors: exceeding posted speed limits, not using safety belts, driving while intoxicated, nighttime driving, and young drivers. METHOD: The importance of each of these factors is documented, known effective countermeasures (both policy and technology based) are discussed, and impediments to the implementation of these countermeasures in the United States are examined. RESULTS: Based on current understanding of the five major risk factors, and of the available countermeasures, there appear to be a variety of opportunities to make substantial gains in road safety using existing knowledge. The limited implementation of a variety of known countermeasures therefore appears to be inconsistent with high-level, strategic goals to improve road safety. Consequently, a recommendation is made to comprehensively re-examine the balance between the countermeasures discussed in this article and economic, mobility, and privacy concerns. IMPACT ON PUBLIC SAFETY: Such a re-examination is likely to result in broad support for these countermeasures, with a consequent major improvement in road safety. 相似文献
943.
Ants inhabit diverse terrestrial biomes from the Sahara Desert to the Arctic tundra. One factor contributing to the ants’
successful colonization of diverse geographical regions is their ability to manipulate objects when excavating nests, capturing,
transporting and rendering prey or grooming, feeding and transporting helpless brood. This paper is the first to report the
form and function of opposable spines on the foretarsi of queens and workers used during fine motor and gross motor object
manipulation in the fire ant, Solenopsis invicta. In conjunction with their mandibles, queens and workers used their foretarsi to grasp and rotate eggs, push or pull thread-like
objects out of their way or push excavated soil pellets behind them for disposal by other workers. Opposable spines were found
on the foretarsi of workers from seven of eight other ant species suggesting that they might be a common feature in the Formicidae. 相似文献
944.
Tognetti Arnaud Ganem Guila Raymond Michel Faurie Charlotte 《Behavioral ecology and sociobiology》2018,72(9):1-10
Behavioral Ecology and Sociobiology - Members of a social group must behave similarly for a group to persist. One way for this behavioural similarity to occur is through the contagious spread of... 相似文献
945.
Jing Ding Wanyi Seow Jizhong Zhou Raymond Jianxiong Zeng Jun Gu Yan Zhou 《Frontiers of Environmental Science & Engineering》2021,15(1):7
946.
van Putten E. Ingrid Pinkard Elizabeth O’Grady Anthony Schmidt Rebecca K. Cresswell Ian Raoult Vincent Taylor Matt D. 《The Environmentalist》2021,41(4):541-555
Environment Systems and Decisions - Globally we are experiencing a decline in aggregate natural capital. Many primary industries and enterprises are highly dependent on renewable and non-renewable... 相似文献
947.
An Investigation Into the Mechanism by Which Synthetic Zeolites Reduce Labile Metal Concentrations in Soils 总被引:3,自引:0,他引:3
Robert Edwards Irina Rebedea Nicholas W. Lepp Anthony J. Lovell 《Environmental geochemistry and health》1999,21(2):157-173
The addition of synthetic zeolites and similar materials to metal contaminated soils has been shown to reduce soil phytotoxicity and to improve the quality of plant growth on such amended soils. To gain an understanding of the mechanism by which the phytotoxicity of contaminated soils is reduced when treated with synthetic zeolites, sequential extraction procedures and soil solution techniques have been used to identify changes associated with metal speciation in amended soils. Sequential extraction data and changes in soil solution composition are presented for three different contaminated soils, amended with three synthetic zeolites (P, 4A and Y) at concentrations of 0.5%, 1% and 5% w/w, or lime at 1%. The soils were collected from the site of a metal refinery, an old lead zinc mine spoil tip and from a field which had been treated with sewage sludge. After incubation of the zeolite treated soils for between one and three months, results showed a reduction in the metal content of the ammonium acetate fraction between 42% and 70%, depending on soil, zeolite and rate of addition, compared with the unamended soils. In addition, soil solution experiments indicated that synthetic zeolite amendments were more efficient at reducing metal content than comparable lime treatment. The mechanism by which synthetic zeolites reduce metal bioavailability in contaminated soils is discussed and compared to other amendments. 相似文献
948.
Dominic Muenzel Kay Critchell Courtney Cox Stuart J. Campbell Raymond Jakub Wahid Suherfian La Sara Iliana Chollett Eric A. Treml Maria Beger 《Conservation biology》2023,37(3):e14038
Larval dispersal connectivity is typically integrated into spatial conservation decisions at regional or national scales, but implementing agencies struggle with translating these methods to local scales. We used larval dispersal connectivity at regional (hundreds of kilometers) and local (tens of kilometers) scales to aid in design of networks of no-take reserves in Southeast Sulawesi, Indonesia. We used Marxan with Connectivity informed by biophysical larval dispersal models and remotely sensed coral reef habitat data to design marine reserve networks for 4 commercially important reef species across the region. We complemented regional spatial prioritization with decision trees that combined network-based connectivity metrics and habitat quality to design reserve boundaries locally. Decision trees were used in consensus-based workshops with stakeholders to qualitatively assess site desirability, and Marxan was used to identify areas for subsequent network expansion. Priority areas for protection and expected benefits differed among species, with little overlap in reserve network solutions. Because reef quality varied considerably across reefs, we suggest reef degradation must inform the interpretation of larval dispersal patterns and the conservation benefits achievable from protecting reefs. Our methods can be readily applied by conservation practitioners, in this region and elsewhere, to integrate connectivity data across multiple spatial scales. 相似文献
949.
The mentoring literature has focused largely on outcomes associated with having been mentored. This study considered informational outcomes associated with being a mentor, viewing the protégé as a source of information for the mentor and vice versa. Survey data were collected across 17 organizations from 161 mentors and 140 protégés. Mentor characteristics and perceptions and characteristics of the relationship were hypothesized to be related to mentors' seeking information from their protégés. Hierarchical regression analyses indicated that perceived appropriateness of mentor information seeking, perceived protégé competence, vocational mentoring functions and protégé influence contributed significantly to the prediction of mentor information seeking among the mentor sample; hierarchical distance, perceived appropriateness and mentor self‐monitoring were significant predictors in the protégé sample. Future research directions are discussed. Copyright © 1999 John Wiley & Sons, Ltd. 相似文献
950.
This paper reports on immediate and long‐term well‐being outcomes for a group of long‐term unemployed youth who attended specially devised training courses based on the cognitive‐behaviour therapy (CBT) model. The courses were aimed specifically at improving the mental health of participants, and providing them with coping skills to deal better with the negative consequences of prolonged unemployment. Results for participants were compared with a waiting‐list, control group. Outcomes investigated were well‐being (psychological distress, self‐esteem, positive and negative affect), and coping behaviours (social support, self care, recreation, and cognitive coping strategies). Behavioural plasticity effects were also examined by comparing outcomes for participants who had higher distress scores prior to the course with participants who reported lower scores at that time. Immediate benefits were identified for both mental health and coping behaviours, and many of these benefits persisted into the long term. Participants with higher levels of pre‐course psychological distress improved more than their low distressed counterparts, supporting the behavioural plasticity hypothesis. Copyright © 1999 John Wiley & Sons, Ltd. 相似文献