全文获取类型
收费全文 | 19145篇 |
免费 | 539篇 |
专业分类
管理学 | 2390篇 |
民族学 | 110篇 |
人才学 | 6篇 |
人口学 | 1848篇 |
丛书文集 | 108篇 |
教育普及 | 2篇 |
理论方法论 | 1770篇 |
现状及发展 | 1篇 |
综合类 | 247篇 |
社会学 | 9524篇 |
统计学 | 3678篇 |
出版年
2023年 | 103篇 |
2022年 | 82篇 |
2021年 | 104篇 |
2020年 | 312篇 |
2019年 | 481篇 |
2018年 | 483篇 |
2017年 | 684篇 |
2016年 | 487篇 |
2015年 | 384篇 |
2014年 | 479篇 |
2013年 | 3239篇 |
2012年 | 693篇 |
2011年 | 605篇 |
2010年 | 495篇 |
2009年 | 465篇 |
2008年 | 522篇 |
2007年 | 530篇 |
2006年 | 480篇 |
2005年 | 435篇 |
2004年 | 429篇 |
2003年 | 404篇 |
2002年 | 408篇 |
2001年 | 484篇 |
2000年 | 393篇 |
1999年 | 387篇 |
1998年 | 319篇 |
1997年 | 285篇 |
1996年 | 300篇 |
1995年 | 283篇 |
1994年 | 263篇 |
1993年 | 257篇 |
1992年 | 297篇 |
1991年 | 293篇 |
1990年 | 262篇 |
1989年 | 261篇 |
1988年 | 248篇 |
1987年 | 231篇 |
1986年 | 224篇 |
1985年 | 249篇 |
1984年 | 241篇 |
1983年 | 240篇 |
1982年 | 182篇 |
1981年 | 159篇 |
1980年 | 174篇 |
1979年 | 170篇 |
1978年 | 144篇 |
1977年 | 142篇 |
1976年 | 124篇 |
1975年 | 116篇 |
1974年 | 98篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
371.
Increasing attention is being given to the possible consequences which might follow from the exhaustion of the world's natural resources. Countering the pessimistic conclusions of such institutions as the Club of Rome, economists such as Wilfred Beckerman have emphasized the importance of substitution, pointing to many examples where a shortage of one raw material has led to the discovery or development of alternative materials, e.g. artificial for natural rubber, aluminium for copper.Substitution usually occurs through normal market mechanisms, i.e. changes in relative prices. However in some circumstances the market mechanism may be inhibited by a variety of factors, so that its operation requires to be supplemented by an outside agency. This article explores this possibility in relation to the paper making industry, which provides a particularly interesting example owing to the existence of a well established market in waste paper, the main substitute for the major natural resource, woodpulp.A brief indication is given of the relative importance of waste paper and an outline of the structure of the U.K. market; the conditions under which greater utilization of waste paper might occur are then considered taking a sideways look at the influence of the individual. In the final section the various implications for the role of the state are summarized. 相似文献
372.
A rational economic hypothesis of the citizen's decision tovote or not vote in U. S. presidential elections has been citedas an example of the replacement of social-psychologically oriented"empirical generalizations" by axiomatically based deductivepropositions in political science. However, close scrutiny showsthat the rational (or political) economic paradigm is no moreaccurate a theory than previously popular systems analysis orfunctional paradigms. The claimed verification of the originalhypothesis was based on an apparently imprecise, adhoc, ordinalprocedure that could not distinguish between the intimatelyrelated rational economic and social-psychological hypotheses.A more powerful technique resolves the issue in favor of thelatter model for the data used by the original authors. 相似文献
373.
374.
Guerrero AM 《Initiatives in population》1976,2(2-3):2-9
The population program in 2 provinces of the Philippines 1 which has achieved success already and 1 where success is expected ultimately - is described. The Laguna program, launched in 1960, has reduced the annual birthrate to 1.8%, the lowest rate in the country. Governor F.T. San Luis, elected that year, is credited with much of the success of the program. The relatively high standard of living of the people in the province, cooperation of various related agencies, and the consistency and continuity of the program have made for success, despite initial problems with financing, conservative opposition, and interagency confusion. Capiz province is the model family program of the Commission on Population - Total Integrated Development Approach program for the southern region of the country. This program originally worked to develop self-awareness concerning needs and ambitions for the future among the people. When the program got under way in 1975, it stressed training, orientation, and education campaigns. Family planning in Capiz is part of the larger socioeconomic development program. 相似文献
375.
In two experiments, refusal rates to telephone interviews werenot affected by substantial changes in the introductory remarksof the interviewer. A prior letter significantly lowered refusalrates in a third experiment. In all three, interviewer sex hadno effect. 相似文献
376.
Katherine A. McComas 《Risk analysis》2003,23(6):1257-1270
This article offers longitudinal data tracking people who did and did not attend a series of public meetings in an upstate New York rural community grappling with the expansion of an existing solid waste landfill and remediation of an adjacent inactive hazardous waste site. Before and after the public meetings, mailed questionnaires measured risk perceptions and perceived credibility of risk managers (here, the state government agencies and the responsible industry) conducting the meetings. Respondents at each measurement point included meeting attendees and nonattendees, with some fluctuation over time when attendees at one measurement point were nonattendees at the next and vice versa. The results from the first survey indicate that following the first two public meetings, attendees perceived greater risks from the waste sites than did nonattendees; attendees also perceived the risk managers as less credible. After the third public meeting, the results showed that attendees' risk perceptions remained steady; however, perceptions of government agency credibility significantly decreased. After the fourth public meeting, the survey found that attendees' risk perceptions were again not significantly different, whereas perceptions of government agency credibility increased significantly. The industry's credibility also increased, though only among attendees who had attended the most recent public meeting, not among attendees who had attended both the third and fourth public meetings. For nonattendees, risk perceptions and credibility ratings did not change. The discussion examines how distinctive characteristics of communication at each public meeting may have resulted in different effects and proposes hypotheses for future research. 相似文献
377.
J. Bessant S. Birley C. Cooper S. Dawson J. Gennard M. Gardiner A. Gray P. Jones C. Mayer J. McGee M. Pidd G. Rowley J. Saunders A. Stark 《英国管理杂志》2003,14(1):51-68
This paper reviews the state of the field of the sub-disciplines within UK management research, based upon the submissions of 94 UK higher education institutions to the Business and Management Studies Panel in the UK's 2001 Research Assessment Exercise (RAE). It offers observations on the UK model of the assessment of quality in, and funding of, research conducted in publicly funded higher education institutions. 相似文献
378.
379.
On the basis of discussion and analysis during and following an ATSDR science panel on the bioavailability of mercury in soils, it is apparent that the default assumption of 100% relative bioavailability for mercury-contaminated soils is excessively conservative. However, current knowledge does not allow the development of default assumptions or guidelines for determining relative bioavailability of mercury in soils. Until such default assumptions or guidelines can be developed, site-specific assays of bioavailability, preferably using either animal bioassays or validated in vitro techniques, may provide the best approach for estimating soil-mercury bioavailability. 相似文献
380.
The objective of this study was to determine the impact of task information (TI) provided by an interface agent during the idea evaluation and integration step of the problem formulation stage of the problem solving process. The effectiveness assessment was based on solving diagnostic decision problems in the domain of complex industrial machinery. Ten domain experts participated in this study. Decision support was provided by a case-based reasoning system. Findings suggest that TI provided by the interface agent had no effect on the decision maker's performance, nor on the associated cognitive effort. However, a verbal protocol analysis revealed that the ten subjects used the interface agent to verify their decision processes. The results and their implications are discussed with respect to current findings in the area of decision support systems. 相似文献