全文获取类型
收费全文 | 4889篇 |
免费 | 102篇 |
国内免费 | 73篇 |
专业分类
安全科学 | 218篇 |
废物处理 | 237篇 |
环保管理 | 1313篇 |
综合类 | 420篇 |
基础理论 | 1119篇 |
环境理论 | 5篇 |
污染及防治 | 1188篇 |
评价与监测 | 336篇 |
社会与环境 | 176篇 |
灾害及防治 | 52篇 |
出版年
2023年 | 23篇 |
2022年 | 21篇 |
2021年 | 50篇 |
2020年 | 31篇 |
2019年 | 63篇 |
2018年 | 74篇 |
2017年 | 93篇 |
2016年 | 113篇 |
2015年 | 114篇 |
2014年 | 107篇 |
2013年 | 554篇 |
2012年 | 187篇 |
2011年 | 254篇 |
2010年 | 198篇 |
2009年 | 195篇 |
2008年 | 260篇 |
2007年 | 266篇 |
2006年 | 242篇 |
2005年 | 162篇 |
2004年 | 183篇 |
2003年 | 193篇 |
2002年 | 172篇 |
2001年 | 86篇 |
2000年 | 112篇 |
1999年 | 99篇 |
1998年 | 74篇 |
1997年 | 65篇 |
1996年 | 77篇 |
1995年 | 74篇 |
1994年 | 61篇 |
1993年 | 68篇 |
1992年 | 75篇 |
1991年 | 46篇 |
1990年 | 54篇 |
1989年 | 44篇 |
1988年 | 36篇 |
1987年 | 45篇 |
1986年 | 47篇 |
1985年 | 40篇 |
1984年 | 47篇 |
1983年 | 49篇 |
1982年 | 42篇 |
1981年 | 55篇 |
1980年 | 46篇 |
1979年 | 25篇 |
1978年 | 26篇 |
1977年 | 18篇 |
1976年 | 14篇 |
1975年 | 15篇 |
1971年 | 13篇 |
排序方式: 共有5064条查询结果,搜索用时 281 毫秒
791.
792.
This research examined linkages between mentor leadership behaviors (laissez‐faire, transactional contingent reward, and transformational), protégé perception of mentoring functions received (career development and psychosocial support) and job‐related stress of 204 mentor–protégé dyads. Results of Partial Least Squares analysis revealed that mentor transformational behavior was more positively related to mentoring functions received than transactional contingent reward behavior, while mentor laissez‐faire behavior was negatively related to mentoring functions received. Both mentor transformational behavior and mentoring functions received were negatively related to protégé job‐related stress. The relationship between mentor transformational behavior and protégé job‐related stress was moderated by the level of mentoring functions received. Results are discussed as they relate to researchers and practitioners who are becoming interested in finding ways to develop organizational members and allay job‐related stress. Copyright © 2000 John Wiley & Sons, Ltd. 相似文献
793.
There is extensive research on employee attitudes regarding employers and unions, but these studies have underemphasized social and affective forces. Most studies also examine attitudes toward either the union or the employer without considering how these attitudes might relate to one another. The present study of faculty (N = 306) at a large public research university demonstrated that perceptions of union support were positively related to union participation and perceptions of administration support were negatively related to union participation. Subjective norms and general union attitudes were related to perceptions of union support, and subjective norms were related to perceived organizational support. Taken together, an individual's participation in a union recognition effort depends not only on union instrumentality, but also upon social relationships with the union and administration. Copyright © 2009 John Wiley & Sons, Ltd. 相似文献
794.
The present study developed a nomological network that theoretically linked time urgency to related variables. To test the proposed relationships, time urgency, achievement strivings (AS), and impatience/irritability (II) were utilized as predictors of health and performance 18 months later. Multivariate canonical correlation analyses provided support for a complex nomological network among the predictors and the outcome measures. Redundancy coefficients and a rotated structure matrix were employed to identify two significant dimensions, labeled crammers and organizers, that linked the predictors with the outcome measures. The results also indicated that the time urgency subcomponents were differentially related to several health outcomes. These findings provide further validity evidence for the time urgency construct, and they suggest that time urgency variables should be considered as important predictors of both health and performance outcomes. Directions for future research on time urgency are discussed. © 1998 John Wiley & Sons, Ltd. 相似文献
795.
This study tested the proposition that relationships among the various types of work-related commitment and job performance are affected by both the form of commitment and the facet of performance under consideration. Results provided some support for this view. As hypothesized, job involvement was related only to performance tied to intrinsically rewarding elements of work, and career commitment was positively related to overall performance effectiveness. Unexpectedly, however, organizational commitment (both affective and continuance) was unrelated to job performance. The discussion is centered on practical implications of these findings and on directions for future research. © 1998 John Wiley & Sons, Ltd. 相似文献
796.
Marc Russell John Rogers Stephen Jordan Darrin Dantin James Harvey Janet Nestlerode Federico Alvarez 《Journal of Coastal Conservation》2011,15(4):647-658
The Tampa Bay Ecosystem Services Demonstration Project (TBESDP) is part of the U.S. Environmental Protection Agency’s Ecosystem
Services Research Program. The principal objectives of TBESDP are to (1) quantify the ecosystem services of the Tampa Bay
watershed, (2) determine the value of ecosystem services to society, (3) predict the supply of ecosystem services under future
scenarios of population growth and climate change, and (4) apply this knowledge through models and tools that will support
the best informed environmental decisions possible. The scope and complexity of this project required intensive effort to
establish which services can be quantified by applying existing models, data, and scientific literature and which services
will require supporting research. Research priorities were assessed by: (1) developing and refining conceptual models of major
ecosystems in the Tampa Bay region, (2) gathering input from stakeholders about the relative importance and values of various
ecosystem services, (3) preparing and reviewing a bibliometric analysis of the volume of scientific literature relevant to
the ecosystems and services of interest, and (4) evaluating an integrated analysis of importance, value, and availability
of scientific information. This analysis led us to focus on two research priorities, seagrass-habitat functions as support
for fishery production, and wetlands as regulators of water quality. 相似文献
797.
This study investigated the effect of a process versus a results focus as well as a group versus individual‐based approach to performance appraisals. Four experimental conditions were investigated, with dependent variables of appraisal satisfaction, perceived accuracy of the performance appraisal, expectations of performance improvement, and actual performance. The results showed that a process focus appraisal had a more positive impact than an exclusively results‐oriented appraisal on ratee appraisal satisfaction, perceived appraisal accuracy, and expectations of performance improvement. Subjects receiving process appraisal feedback also showed a greater improvement in actual performance during a subsequent trial compared to subjects that did not receive process feedback. No differences were found between the group‐ and the individual‐based performance appraisal conditions. Implications of these findings for appraisal processes in general, and total quality initiatives in particular, are discussed. Copyright © 1999 John Wiley & Sons, Ltd. 相似文献
798.
The establishment of marine protected areas (MPAs) is a critical step in ensuring the continued persistence of marine biodiversity. Although the area protected in MPAs is growing, the movement of individuals (or larvae) among MPAs, termed connectivity, has only recently been included as an objective of many MPAs. As such, assessing connectivity is often neglected or oversimplified in the planning process. For promoting population persistence, it is important to ensure that protected areas in a system are functionally connected through dispersal or adult movement. We devised a multi-species model of larval dispersal for the Australian marine environment to evaluate how much local scale connectivity is protected in MPAs and determine whether the extensive system of MPAs truly functions as a network. We focused on non-migratory species with simplified larval behaviors (i.e., passive larval dispersal) (e.g., no explicit vertical migration) as an illustration. Of all the MPAs analyzed (approximately 2.7 million km2), outside the Great Barrier Reef and Ningaloo Reef, <50% of MPAs (46-80% of total MPA area depending on the species considered) were functionally connected. Our results suggest that Australia's MPA system cannot be referred to as a single network, but rather a collection of numerous smaller networks delineated by natural breaks in the connectivity of reef habitat. Depending on the dispersal capacity of the taxa of interest, there may be between 25 and 47 individual ecological networks distributed across the Australian marine environment. The need to first assess the underlying natural connectivity of a study system prior to implementing new MPAs represents a key research priority for strategically enlarging MPA networks. Our findings highlight the benefits of integrating multi-species connectivity into conservation planning to identify opportunities to better incorporate connectivity into the design of MPA systems and thus to increase their capacity to support long-term, sustainable biodiversity outcomes. 相似文献
799.
Baucum Matt John Richard S. Burns William Portney Kent E. Mumpower Jeryl L. 《The Environmentalist》2021,41(2):227-235
Environment Systems and Decisions - There is great value in understanding the public’s reactions to terror attacks, though such reactions pose stark challenges for sound psychological... 相似文献
800.