全文获取类型
收费全文 | 4312篇 |
免费 | 236篇 |
国内免费 | 28篇 |
专业分类
管理学 | 331篇 |
民族学 | 23篇 |
人口学 | 253篇 |
丛书文集 | 439篇 |
理论方法论 | 214篇 |
综合类 | 1378篇 |
社会学 | 405篇 |
统计学 | 1533篇 |
出版年
2024年 | 1篇 |
2023年 | 27篇 |
2022年 | 27篇 |
2021年 | 52篇 |
2020年 | 109篇 |
2019年 | 106篇 |
2018年 | 104篇 |
2017年 | 97篇 |
2016年 | 96篇 |
2015年 | 108篇 |
2014年 | 243篇 |
2013年 | 480篇 |
2012年 | 192篇 |
2011年 | 261篇 |
2010年 | 125篇 |
2009年 | 195篇 |
2008年 | 168篇 |
2007年 | 211篇 |
2006年 | 133篇 |
2005年 | 106篇 |
2004年 | 149篇 |
2003年 | 173篇 |
2002年 | 243篇 |
2001年 | 208篇 |
2000年 | 158篇 |
1999年 | 55篇 |
1998年 | 64篇 |
1997年 | 67篇 |
1996年 | 30篇 |
1995年 | 48篇 |
1994年 | 43篇 |
1993年 | 5篇 |
1992年 | 13篇 |
1991年 | 11篇 |
1990年 | 1篇 |
1989年 | 3篇 |
1988年 | 9篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1985年 | 65篇 |
1984年 | 69篇 |
1983年 | 68篇 |
1982年 | 72篇 |
1981年 | 56篇 |
1980年 | 37篇 |
1979年 | 32篇 |
1978年 | 47篇 |
1977年 | 6篇 |
1976年 | 1篇 |
排序方式: 共有4576条查询结果,搜索用时 15 毫秒
71.
Suen W 《Journal of population economics》1997,10(4):443-461
This paper provides an overview of retirement patterns in Hong Kong on the basis of limited data. A censored regression model
is used to infer the retirement age from people‘s current retirement status and their current age. This model is equivalent
to a restricted probit model, and the interpretation of parameters is straightforward. The results clearly show a negative
income effect on the retirement decision. The retirement age seems to be positively related to lifetime earnings but negatively
related to the rate of decline of earnings with age.
JEL classification: C24, J14, J26
Received May 6, 1996 / Accepted February 5, 1997 相似文献
72.
This paper models household fertility decisions by using a generalized Poisson regression model. Since the fertility data
used in the paper exhibit under-dispersion, the generalized Poisson regression model has statistical advantages over both
standard Poisson and negative binomial regression models, and is suitable for analysis of count data that exhibit either over-dispersion
or under-dispersion. The model is estimated by the method of maximum likelihood. Approximate tests for the dispersion and
goodness-of-fit measures for comparing alternative models are discussed. Based on observations from the Panel Study of Income
Dynamics of 1989 interviewing year, the empirical results support the fertility hypothesis of Becker and Lewis (1973).
Received January 7, 1997 /Accepted April 3, 1997 相似文献
73.
Summary We consider a lotL formed byN apparently similar unitsW
1,…,W
N, where each of theW
i may come from one of two different populationsP
1 andP
2;T
1,…,T
N denote the corresponding lifetimes. The units fromP
i
undergo a failure of kindi and their survival function isS
i
(t).
We assume that the failure rate function
are known and that the units fromP
1 are ?substandard?: λ
1
(t)≥λ
2
(t), ∀t≥0.
We want to putW
1,…,W
N under a pre-operational test (burn-in test) in order to eliminate at least a great part of the substandard units and we face
the problem of obtaining a rule for stopping the test under the assumption that, with the failure of a unit, it is possible
to recognize the population from which the unit comes.
Such a problem will be formalized as an optimal stopping problem for a suitably defined Markov process. Our study shall evidentiate
some fundamental aspects of the problem and the role of the prior distribution of the (random) numberM
0 of those units inL coming fromP
1 (substandard). The latter distribution has a great influence on the form of the solution.
This research was supported by the C.N.R. Project ?Statistica Bayesiana e Simulazione in Affidalità e Modellistica Biologica?. 相似文献
74.
75.
The purpose of this study was to evaluate one phase of a statewide program of deinstitutionalizing developmentally disabled individuals. Forty adults who had spent a minimum of six months in community placements were evaluated with respect to changes in behavior associated with movement out of state institutions and into community settings such as group homes and day activity centers. Pre- and post-deinstitutionalization measures were taken with the Behavior Development Survey. Post-deinstitutionalization measures on Cataldo and Risley's Resident Activity Manifest were compared to the same measures obtained on 159 developmentally disabled individuals scheduled for deinstitutionalization. A consistent pattern of positive changes on both instruments favored deinstitutionalization, but changes could not be unequivocally attributed to movement out of the institutions per se. 相似文献
76.
Orsenigo Luigi Pammolli Fabio Riccaboni Massimo Bonaccorsi Andrea Turchetti Giuseppe 《Journal of Management and Governance》1997,1(2):147-175
The paper moves a step forward in the direction of establishing a connection between the structure and evolution of knowledge
bases and the structure and evolution of organizational forms in innovative activities in a science-intensive industry. The
paper has an explicit focus on the dynamics of the network of collaborative agreements in R&D in the pharma/biotech industry
after the “molecular biology revolution”. Using a comprehensive dataset, built by the authors integrating several sources
in the industry, the dynamics of the network over time is extensively analyzed. With regards to network structure, it is found
that, while the size of the network increases over time due to net flows of entry, its topological properties remain relatively
unchanged. The evolution of the network has occurred without relevant deformations in the core-periphery profile. With regards
to age-dependent propensity to collaborate, the paper finds that the extent of inter-generational collaboration is much more
significant than intra-generational collaboration. In addition, the propensity of firms of a given generation to enter into
collaboration with firms of a different generation increases with the distance between the two, while the total number of
intra-generational collaborations decreases over time and, moreover, tends to decrease for most recent generations. In the
paper a unitary and coherent explanation of the evidence is developed, coming to reveal the existence of a striking isomorphism
between structural properties of the dynamics of knowledge and of the evolution of network structure.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
77.
The purpose of ISO 9001:2000 Quality Management System (QMS) is to provide businesses with a model to grow systematically while assuring the quality of their products. The validity of ISO 9001:2000 QMS stems, largely, from the fact that the best minds worldwide have contributed to its development and maintenance, and the fact that many companies have reported real business gains because of its implementation. Unfortunately, many small businesses fail to survive due to the absence or lack of adequate system for managing quality. An obvious recommendation would be to implement ISO 9001:2000 QMS. Nevertheless, small businesses often cite lack of resources and time as the main reasons for not implementing ISO 9001:2000 QMS. 相似文献
78.
The accelerating pace of change in science and technology has resulted in new attention to the process of identifying and developing ideas that ultimately lead to new scientific capabilities and business opportunities for an organization. The need to refresh research programs and capabilities is as important in federally funded research institutions as it is for industry. This paper explores the critical success factors for new initiatives at a federal laboratory, and building on lessons learned through this study and in private industry, identifies a more systematic process that could potentially improve the effectiveness of these initiatives in achieving results. 相似文献
79.
债券增信能帮助企业以更好的条件发行债券,因而对企业的创新能力产生影响。通过对2007-2015年上市债券的研究发现:债券增信能够显著提升企业创新能力,但不同的增信方式(第三方保证、抵押和质押)其影响存在差异,其中,以采用抵押担保的增信方式效果为最佳;并且,债券增信对企业创新的提升效果在融资约束企业更为明显,从另一侧面证明了融资约束对企业创新的负面影响。 相似文献
80.
弹性资本充足率监管加刚性杠杆率监管存在机理性缺陷。弹性资本充足率监管会影响刚性杠杆率监管的效果,刚性杠杆率监管也不能体现杠杆累积在时间维度和空间维度风险的变化。若引入弹性杠杆率缓冲,刚性杠杆率监管加弹性资本充足率监管的机理性缺陷就可以避免。因此,有必要实施弹性杠杆率监管,杠杆率的弹性化程度与银行的系统重要性程度相对应。 相似文献