全文获取类型
收费全文 | 19759篇 |
免费 | 538篇 |
国内免费 | 1篇 |
专业分类
管理学 | 2853篇 |
民族学 | 76篇 |
人才学 | 1篇 |
人口学 | 1913篇 |
丛书文集 | 80篇 |
教育普及 | 2篇 |
理论方法论 | 1801篇 |
现状及发展 | 1篇 |
综合类 | 265篇 |
社会学 | 9678篇 |
统计学 | 3628篇 |
出版年
2021年 | 117篇 |
2020年 | 281篇 |
2019年 | 387篇 |
2018年 | 450篇 |
2017年 | 615篇 |
2016年 | 488篇 |
2015年 | 361篇 |
2014年 | 482篇 |
2013年 | 3148篇 |
2012年 | 651篇 |
2011年 | 626篇 |
2010年 | 464篇 |
2009年 | 382篇 |
2008年 | 460篇 |
2007年 | 472篇 |
2006年 | 474篇 |
2005年 | 462篇 |
2004年 | 418篇 |
2003年 | 387篇 |
2002年 | 435篇 |
2001年 | 534篇 |
2000年 | 539篇 |
1999年 | 467篇 |
1998年 | 349篇 |
1997年 | 316篇 |
1996年 | 332篇 |
1995年 | 310篇 |
1994年 | 294篇 |
1993年 | 301篇 |
1992年 | 345篇 |
1991年 | 325篇 |
1990年 | 293篇 |
1989年 | 293篇 |
1988年 | 294篇 |
1987年 | 259篇 |
1986年 | 249篇 |
1985年 | 279篇 |
1984年 | 273篇 |
1983年 | 260篇 |
1982年 | 222篇 |
1981年 | 189篇 |
1980年 | 174篇 |
1979年 | 204篇 |
1978年 | 183篇 |
1977年 | 163篇 |
1976年 | 145篇 |
1975年 | 172篇 |
1974年 | 120篇 |
1973年 | 120篇 |
1972年 | 97篇 |
排序方式: 共有10000条查询结果,搜索用时 281 毫秒
811.
Cellular manufacturing systems have been proposed as an alternative to the job shop since they provide some of the operational benefits of a flow line production process, while retaining to some extent the flexibility of job shops. However, this must be balanced against the possibility of additional initial investments in equipment to form the cells and a certain loss in manufacturing flexibility, particularly in terms of the ability to deal with long-term demand changes. This paper presents a model-based heuristic cell system redesign methodology to deal with such demand changes. The methodology is validated and applied to system designs generated from several data sets published in the literature. Results show that different kinds of demand changes incur distinct kinds of costs. Further, characteristics of cell designs that can handle long-term demand changes at least cost are identified. 相似文献
812.
Michael L. Gargas Robin L. Norton Mark A. Harris Dennis J. Paustenbach Brent L. Finley 《Risk analysis》1994,14(6):1019-1024
Biomonitoring programs for urinary chromium (Cr) typically attempt to evaluate occupational exposure via the inhalation route. This study investigated whether Cr can be detected in the urine of people following the ingestion of soils that contain relatively high concentrations of chromium in chromite ore processing residue (COPR). To evaluate the reasonableness of using urinary monitoring to assess environmental exposure, six volunteers ingested 400 mg of soil/day (low-dose group), two others ingested 2.0 g of soil/day (high-dose group) for 3 consecutive days, and one person ingested a placebo on each of 3 days. The soil and COPR mixture contained concentrations of total chromium (Cr) and hexavalent chromium [Cr(VI)] of 103 ± 20 and 9.3 ± 3.8 mg/kg, respectively. Therefore, the low-dose group ingested 41 μg Cr/day [including 3.7 μg Cr(VI)] and the high-dose group ingested 206 μg Cr/day [including 18.6 μg Cr(VI)] on each of 3 consecutive days. All urine samples were collected and analyzed individually for total Cr on the day prior to dosing, during the 3 days of dosing, and up to the first void 48 h after the last dose. No significant increases in urinary Cr excretion were found when background excretion data were compared with data following each of the 3 days of dosing or in daily mean urine concentrations of the high- vs the low-dose groups. It appears that Cr present in a soil and COPR mixture at Cr doses up to 200 μg/day is not sufficiently bioavailable for biomonitoring of urine to be informative. These results are consistent with previously published findings suggesting that incidental exposure to dusts and soils containing comparable levels of Cr will not result in increased concentrations of Cr in urine. 相似文献
813.
Auditors' assessment of management's dispositions presumably affects their subsequent judgments. However, little is known about the process by which auditors infer characteristics of management. This paper proposes the theory of correspondent inferences [25] as a framework for examining auditors' assessment of management's dispositions; the model is tested in a laboratory experiment using experienced audit managers. The results are consistent with the proposed theoretical framework. Implications for future research are discussed. 相似文献
814.
Most models of investor behavior assume a time-state independent utility function and result in a deterministic solution where a given set of inputs uniquely specifies the decision. In contrast, a state preference model using a time-state dependent utility function is derived in this paper. The model allows the investment choice decision to be analyzed in a game theoretic context. The general solution is a mixed strategy which allows for a probabilistic interpretation of the decision. The approach presented in this paper can accommodate anomalies such as intransitivity of preference and satisficing as rational behavior. An example of a possible implementation is given along with interpretations of the outcomes. 相似文献
815.
OSCAR F. GARZA ALEX J. GOLUB JACK F. LUPER ALAN W. NEEBE 《Production and Operations Management》1992,1(2):151-158
R. J. Reynolds Tobacco USA (RJR) is currently implementing a microcomputer-based decision support system to computerize and optimize the selection of patterns for loading cases of finished product into truck trailers at RJR's Central Distribution Center. This system allows for the efficient loading of trucks with less supervision. Total annual savings from reduced personnel and shipping costs is approximately $850,000. In addition to these benefits, the system is a stepping stone for trailer loading automation and the integration of a comprehensive load planning system. 相似文献
816.
817.
In studying the complex determinants of human fertility, social scientists have given little attention to population density,
although reproduction has been shown to be density-dependent for a wide variety of other species. Using fixed effects models
on the time series of 145 countries and controlling for key social and economic variables, we find a consistent and significant
negative relationship between human fertility and population density. Moreover, we find that individual fertility preferences
also decline with population density. These findings suggest that population density should be included as a variable in future
studies of fertility determinants.
相似文献
Wolfgang LutzEmail: |
818.
Morris RJ 《Journal of homosexuality》2006,51(3):225-247
In the long history of the West's encounter with Hawaiian culture, which began in the late 1700s with Captain Cook, translators and translations have often been the tools of intentional falsehood, thus demonstrating the truth of the Italian proverb, Traduttore, traditore ("the translator is a traitor")--particularly with regard to same-sex texts. The standards of truth have often been subverted in translation by the demands of foreign religion, hegemony, business, and academe. This subversion continues to this day in the form of the "missionary mentality" in politics and law. The way out of this situation is a brutally honest cleaning-off of the besmirched Hawaiian texts. 相似文献
819.
Much of the current knowledge pertaining to information technology (IT) and decision making is based on decades old technologies that revolved around a central computing function and application-specific systems. The purpose of this research is to examine the IT decision-making relationship within the emerging organizational computing (OC) environment permeated by spontaneous utilization of both application-and nonapplication-specific computing and communication technologies. Specifically, this study seeks to explore managers' perceptions of the emerging OC environment as a facilitator of their decision-making activities. To achieve a higher level of clarity than previous works, a two-dimensional research framework is developed with the IT dimension consisting of computing and communication, and the decision-making dimension differentiated between operational and managerial decisions. A survey instrument was constructed that measured the computing and communication dimensions of information technology use and their perceived effects upon operational and managerial decisions. The major findings of the study confirmed that managers recognize the value of general, nonapplication-specific information technologies in decision making, and that this recognition is highly associated with how intensively these information technologies are used. Additionally, it was found that the two dimensions of IT differ in their relationships to decision making, and that IT usage relates to managerial decisions differently than operational decisions. These study findings have significant implication for practice and research, especially in the context of information resource management in which the primary purpose of the IS function is the delivery of general information service to users rather than the development of specific IS applications. 相似文献
820.
Alcorta Ludovico Smits Jeroen Swedlund Haley J. de Jong Eelke 《Social indicators research》2020,149(2):445-465
Social Indicators Research - Research and policy circles often emphasize the importance of social capital in achieving social transformation and economic development. There is also, however,... 相似文献