全文获取类型
收费全文 | 324篇 |
免费 | 60篇 |
国内免费 | 2篇 |
专业分类
安全科学 | 68篇 |
废物处理 | 11篇 |
环保管理 | 62篇 |
综合类 | 31篇 |
基础理论 | 102篇 |
污染及防治 | 82篇 |
评价与监测 | 7篇 |
社会与环境 | 14篇 |
灾害及防治 | 9篇 |
出版年
2022年 | 1篇 |
2021年 | 3篇 |
2020年 | 2篇 |
2019年 | 15篇 |
2018年 | 17篇 |
2017年 | 16篇 |
2016年 | 21篇 |
2015年 | 13篇 |
2014年 | 32篇 |
2013年 | 13篇 |
2012年 | 8篇 |
2011年 | 10篇 |
2010年 | 8篇 |
2009年 | 39篇 |
2008年 | 24篇 |
2007年 | 22篇 |
2006年 | 18篇 |
2005年 | 23篇 |
2004年 | 25篇 |
2003年 | 24篇 |
2002年 | 18篇 |
2001年 | 13篇 |
2000年 | 7篇 |
1999年 | 6篇 |
1998年 | 2篇 |
1997年 | 1篇 |
1996年 | 1篇 |
1993年 | 1篇 |
1985年 | 2篇 |
1978年 | 1篇 |
排序方式: 共有386条查询结果,搜索用时 15 毫秒
331.
Lieke L. ten Brummelhuis Claartje L. ter Hoeven Menno D. T. de Jong Bram Peper 《组织行为杂志》2013,34(3):273-290
The aim of this study was twofold. First, we examined depleting and enriching effects of employees' home domain (home demands and quality time spent at home) on unscheduled absence from work. Second, we tested the assumption of the medical and withdrawal models that absence duration and frequency are uniquely predicted by respectively health condition and job motivation. We used longitudinal, different‐source data from 1014 employees. The results showed that home quality time was negatively related to absence frequency and duration in the following year through a physical pathway (less physical stress symptoms and health complaints) and through a psychological pathway (less psychological stress symptoms, increased job motivation). Employees with heavy home demands reported more physical and psychological stress symptoms, more health complaints, and lower job motivation. Accordingly, they had longer and more frequent sick leaves in the consecutive year. We conclude that the home domain adds to our understanding of absence from work. In addition, the model including cross pathways between health complaints and job motivation on the one hand, and absence frequency and duration on the other, best fitted the data. Thus, a clear distinction between volitional absence (frequency) and absence due to illness (duration) seems hard to justify. Copyright © 2012 John Wiley & Sons, Ltd. 相似文献
332.
A process model of employee engagement: The learning climate and its relationship with extra‐role performance behaviors 下载免费PDF全文
Employee engagement has recently been introduced as a concept advantageous to organizations. However, little is known about the value of employee engagement in explaining work performance behaviors compared with similar concepts. The learning climate, defined as the organization's beneficial activities in helping employees create, acquire, and transfer knowledge, has also been proposed as an antecedent of employee engagement. Using data from a sample of 625 employees and their supervisors in various occupations and organizations throughout Israel, we investigated employee engagement as a key mechanism for explaining the relationship between perceptions of the organization's learning climate and employees' proactivity, knowledge sharing, creativity, and adaptivity. We also tested whether employee engagement explained the relationship more thoroughly than similar concepts such as job satisfaction and job involvement. Multilevel regression analyses supported our hypotheses that employee engagement mediates the relationship between the perceived learning climate and these extra‐role behaviors. Moreover, engagement provides a more thorough explanation than job satisfaction or job involvement for these relationships. The implications for organizational theory, research, and practice are discussed. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
333.
Environmental attitudes are considered to be important factors that influence sustainable consumption. Typically, attitudes fall into two main types: a general environmental attitude (GEA) and a specific environmental attitude (SEA). This study found that the effect of the SEA is stronger than the GEA in regard to sustainable consumption behavior. Also, when analyzing the purchasing behavior of green products, the SEA is a more appropriate and consistent predictor of behavior than the GEA. The study suggests a more operationalized and salient definition of the intended meaning of the term “environmental attitude,” and also advises researchers and marketing professionals to use a framework that contains both types of environmental attitudes in order to better understand what drives the attitude–behavior gap in green consumer behavior. 相似文献
334.
DIANA M. PIETRI GEORGINA G. GURNEY NANCY BENITEZ‐VINA AUDREY KUKLOK SARA M. MAXWELL LIBBY WHITING MICHAEL A. VINA LEKELIA D. JENKINS 《Conservation biology》2013,27(5):958-967
Seasoned conservation researchers often struggle to bridge the research–implementation gap and promote the translation of their work into meaningful conservation actions. Graduate students face the same problems and must contend with obstacles such as limited opportunities for relevant interdisciplinary training and a lack of institutional support for application of research results. However, students also have a crucial set of opportunities (e.g., access to academic resources outside their degree programs and opportunities to design research projects promoting collaboration with stakeholders) at their disposal to address these problems. On the basis of results of breakout discussions at a symposium on the human dimensions of the ocean, a review of the literature, and our own experiences, we devised recommendations on how graduate students can create resources within their academic institutions, institutionalize resources, and engage with stakeholders to promote real‐world conservation outcomes. Within their academic institutions, graduate students should foster links to practitioners and promote knowledge and skill sharing among students. To institutionalize resources, students should cultivate student leaders and faculty sponsors, systematically document their program activities, and engage in strategic planning to promote the sustainability of their efforts. While conducting research, students should create connections to and engage actively with stakeholders in their relevant study areas and disseminate research results both to stakeholders and the broader public. Our recommendations can serve as a template for graduate students wishing to bridge the research–implementation gap, both during their current studies and in their future careers as conservation researchers and practitioners. Recomendaciones Prácticas para Ayudar a Estudiantes a Vencer la Brecha entre Investigación e Implementación y Promover la Conservación 相似文献
335.
Attempts to minimize the effects of human–wildlife conflict (HWC) on conservation goals require an understanding of the mechanisms by which such conflicts are caused and sustained. This necessitates looking beyond the natural sciences to the human dimensions of wildlife management. Public dissemination of information regarding HWC occurs largely through the mass media. We conducted a content analysis of print media articles on human–leopard conflict in Mumbai, India. We sought to understand the framing of HWC and the changes in media coverage over a 10‐year period (2001–2011) during which a large number of attacks on people prior to 2005 were followed by a program of trapping and relocation. After 2005, when there was a decrease in the level of conflict, the tone of English‐language media reports changed. The perpetrator framing was over 5 times more likely before 2005, whereas a neutral framing was twice as likely after 2005. English‐language and non‐English‐language print media differed significantly in their framing of HWC and in the kinds of solutions advocated. Our results also suggest the print mass media in Mumbai could be an influential conduit for content that diminishes HWC. These media outlets seem attentive to human–leopard conflict, capable of correcting erroneous perceptions and facilitating mitigation and effective management. We believe better contact and mutual understanding between conservation professionals and the mass media could be an important component of managing HWC. We further suggest that in such interactions conservation professionals need to be aware of cultural and linguistic differences in reporting within the country. Entendiendo el Papel de las Representaciones del Conflicto Humano–Leopardo en Mumbai A Través del Análisis de Contenido de Medios 相似文献
336.
The desire of oil companies operating in the Niger Delta to secure their social license to operate, and address their community development obligations, has led in recent years to the adoption of corporate social responsibility (CSR) policies and strategies. Drawing on quantitative and qualitative data collected in host communities within the Niger Delta in Nigeria, the paper compares the effectiveness of two different corporate2013;community involvement strategies. The evidence suggests that while the corporate2013;community foundation model has certain advantages over the in-house community investment model, both approaches suffer from a common shortcoming that limits the impact of oil companies’ efforts on community development in their host communities. The paper concludes by exploring the implications of the research findings for corporate2013;community involvement in the Nigerian oil industry. 相似文献
337.
Failure to account for interactions between endangered species may lead to unexpected population dynamics, inefficient management strategies, waste of scarce resources, and, at worst, increased extinction risk. The importance of species interactions is undisputed, yet recovery targets generally do not account for such interactions. This shortcoming is a consequence of species‐centered legislation, but also of uncertainty surrounding the dynamics of species interactions and the complexity of modeling such interactions. The northern sea otter (Enhydra lutris kenyoni) and one of its preferred prey, northern abalone (Haliotis kamtschatkana), are endangered species for which recovery strategies have been developed without consideration of their strong predator–prey interactions. Using simulation‐based optimization procedures from artificial intelligence, namely reinforcement learning and stochastic dynamic programming, we combined sea otter and northern abalone population models with functional‐response models and examined how different management actions affect population dynamics and the likelihood of achieving recovery targets for each species through time. Recovery targets for these interacting species were difficult to achieve simultaneously in the absence of management. Although sea otters were predicted to recover, achieving abalone recovery targets failed even when threats to abalone such as predation and poaching were reduced. A management strategy entailing a 50% reduction in the poaching of northern abalone was a minimum requirement to reach short‐term recovery goals for northern abalone when sea otters were present. Removing sea otters had a marginally positive effect on the abalone population but only when we assumed a functional response with strong predation pressure. Our optimization method could be applied more generally to any interacting threatened or invasive species for which there are multiple conservation objectives. Definición de Metas de Recuperación Realistas para Dos Especies en Peligro Interactuantes, Enhydra lutris y Haliotis kamtschatkana 相似文献
338.
Lior C. Goldenberg Abraham J. Melloul Uri Zoller 《Journal of environmental management》1996,46(4):311-326
Based on the reality of (a) soil heterogeneity in the vadose zone, (b) enhanced desorption from soil and solubility in water of water insoluble contaminants in the presence of surfactants, and (c) wetting/drying cycles of groundwater recharge (a major cause of fractures formation), a coherent “short-cut” conceptual approach is advanced to account for enhanced groundwater contamination. This is an attempt to close the gap between theory, lab simulations and conventional modelling-based predictions, and observed higher concentrations and more rapid arrival times of contaminants reaching groundwater. Recent data concerning chloride ion and non-ionic surfactants concentrations in aquifers and groundwater wells, combined with previous results concerning the concentrations of tritium, chlorides, metals, organic hydrocarbons and surfactants in the unsaturated and saturated zones of Israel's aquifers, are accounted for in terms of the “short-cut” approach. The contradiction between predictions of groundwater contamination made with conventional, deterministic, homogeneous models and the actual observed behavior of contaminants in soils and aquifers is thus explaind. The “short cut” approach should not be perceived as a better type of model to guide modelling. Rather, it is a proposal for a conceptual change from the realistically invalid, but commonly accepted, conventional “buffer-protective soil/long-term groundwater contamination” to the “short cut” conceptual model to explain the enhanced groundwater contamination actually observed. Although the validity of the proposed approach is strongly supported by the data here presented for the case of Israel (serving as an illustrative case study), selected results and conclusions drawn from studies conducted worldwide suggest its general applicability and usefulness. A major conclusion evolved from the “short-cut” conceptual model is that contemporary groundwater management policies, based on the current perception of groundwater contamination processes and their modelling, may result in an irreversible detrimental effect on the environmental situation in the long run. In any case, prevention, rather than correction/remediation, is strongly recommended as the strategy of choice for rational long-term management of groundwater resources. 相似文献
339.
A series of aromatic heterocyclic and hydrocarbon compounds were tested for toxicity and biotransformation potential against two contrasting lux-marked whole-cell microbial biosensors. Toxicity was determined by inhibition of light output of a Pseudomonas fluorescens construct that expresses lux constitutively. Biotransformation was tested by increase in light output of P. fluorescens HK44 (pUTK21), which expresses lux when in the presence of a metabolic intermediate (salicylate). The data were then modelled against physical/chemical properties of the compounds tested to see if quantitative structure2013;activity relationships (QSARs) could be derived. Toxicity was found to be accurately predicted by log Kow (R2=0.95, Q2=0.88), with the basic (pyridine-ring containing) heterocycles modelled separately. The biotransformation data were best modelled using lowest unoccupied molecular orbital (LUMO) energies (R2=0.90, Q2=0.87). 相似文献
340.