全文获取类型
收费全文 | 29439篇 |
免费 | 552篇 |
国内免费 | 2篇 |
专业分类
管理学 | 3818篇 |
民族学 | 160篇 |
人才学 | 3篇 |
人口学 | 2652篇 |
丛书文集 | 129篇 |
教育普及 | 1篇 |
理论方法论 | 2617篇 |
综合类 | 280篇 |
社会学 | 14396篇 |
统计学 | 5937篇 |
出版年
2023年 | 177篇 |
2022年 | 136篇 |
2021年 | 186篇 |
2020年 | 491篇 |
2019年 | 683篇 |
2018年 | 858篇 |
2017年 | 1139篇 |
2016年 | 833篇 |
2015年 | 601篇 |
2014年 | 805篇 |
2013年 | 5229篇 |
2012年 | 1059篇 |
2011年 | 957篇 |
2010年 | 732篇 |
2009年 | 581篇 |
2008年 | 743篇 |
2007年 | 700篇 |
2006年 | 737篇 |
2005年 | 621篇 |
2004年 | 589篇 |
2003年 | 527篇 |
2002年 | 543篇 |
2001年 | 727篇 |
2000年 | 656篇 |
1999年 | 618篇 |
1998年 | 483篇 |
1997年 | 400篇 |
1996年 | 462篇 |
1995年 | 445篇 |
1994年 | 407篇 |
1993年 | 392篇 |
1992年 | 454篇 |
1991年 | 452篇 |
1990年 | 436篇 |
1989年 | 383篇 |
1988年 | 389篇 |
1987年 | 340篇 |
1986年 | 335篇 |
1985年 | 382篇 |
1984年 | 358篇 |
1983年 | 329篇 |
1982年 | 268篇 |
1981年 | 218篇 |
1980年 | 236篇 |
1979年 | 274篇 |
1978年 | 219篇 |
1977年 | 189篇 |
1976年 | 137篇 |
1975年 | 148篇 |
1974年 | 154篇 |
排序方式: 共有10000条查询结果,搜索用时 9 毫秒
991.
Kulkin HS 《Journal of homosexuality》2006,50(4):97-111
Mental health practitioners who find themselves working with lesbian youth have a limited knowledge base by which to guide them in the helping process. This article explores, examines, and synthesizes current literature in an attempt to uncover factors that serve to enhance adaptive coping strategies for lesbian youth. 相似文献
992.
Strahle A Stainton MC 《Women and birth : journal of the Australian College of Midwives》2006,19(1):17-21
Comments of women engaged in a longitudinal study of urinary leaking from first trimester to 12 months following birth provide the data for this paper. Useful insights into the factors contributing to the maintenance of silence and ways to break the barriers to discussion of urinary incontinence before, during and following pregnancy were revealed. Given the prevalence of 30% of Australian women experiencing urinary leaking following pregnancy, it is imperative that midwives engage in discussion and support prevention of this unwelcome outcome of childbirth. 相似文献
993.
Graham S Gill A Lamers D 《Women and birth : journal of the Australian College of Midwives》2006,19(1):23-28
A very small proportion of newborns fail to establish a normal respiratory pattern without some assistance at birth and newborns requiring resuscitative measures at birth should have a skilled practitioner able to provide it. In this small hospital midwives felt unskilled in newborn resuscitation and paediatricians were not always immediately available. A stakeholder group gathered to discuss the problem. A training program was implemented that improved the skills, confidence and support of the attending midwife to resuscitate the newborn effectively. The aim was to improve the outcome for the infant whilst maintaining the mother's choice of birthing in a small local hospital close to family and friends. 相似文献
994.
995.
Gerard M. Campbell 《决策科学》1992,23(2):312-331
Fixed interval scheduling is studied in the context of a rolling horizon framework that is developed by building on previous work in the master scheduling area. The rolling horizon framework includes a stationary scheduling model which uses the “time fencing’concept by partitioning the planning horizon into three sections. The lengths of these sections and the frequency at which the stationary problem is updated and resolved are discussed as parameters of the rolling horizon model. Two different interpretations of the freeze interval parameter are examined, enabling confirmation and clarification of results presented in an earlier study. Details are given for three methods of calculating safety stocks as a function of rolling horizon parameters, including a method which results in optimal safety stock levels. A comparison of the safety stock methods shows that the constant safety stock method can result in inventories that are significantly above optimal under certain conditions, whereas the constant service level method consistently yields nearly optimal results. 相似文献
996.
Joglekar and Tharthare [6] presented an alternate approach for minimizing total inventory carrying and ordering costs of a vendor and the purchaser(s). This approach permits the vendor and the purchaser(s) to rationally select their operating policies. Joglekar and Tharthare claimed that their approach is more economical than the joint lot-size approach. In this note we identify some conceptual issues in their approach and demonstrate the superiority of the joint lot-size approach with the help of an example. 相似文献
997.
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
998.
Marketing communication intensity (i.e., the ratio of advertising and promotional expenditures to sales) has been an important topic for both business managers and academics. Here, we investigate cross-sectional and time-series variation of communication intensity due to: type of offering (product versus service) and type of market (consumer versus industrial). Overall, we find that both of these factors affect variation of communication intensity across industries and over time. However, the effect of market type is much more dramatic than the effect of offering type. Such knowledge about patterns in communication intensity levels helps managers make decisions about how much to spend on advertising and promotion. 相似文献
999.
CLAYTON M. CHRISTENSEN 《Production and Operations Management》1992,1(4):334-357
The technology S-curve is a useful framework describing the substitution of new for old technologies at the industry level. In this paper I use information from the technological history of the disk drive industry to examine the usefulness of the S-curve framework for managers at the firm level in planning for new technology development. Because improvements in over-all disk drive product performance result from the interaction of improved component technologies and new architectural technologies, each of these must be monitored and managed. This paper focuses on component technology S-curves, and a subsequent paper, also published in this issue of the journal, examines architectural technology Scurves. Improvement in individual components followed S-curve patterns, but I show that the flattening of S-curves is a firm-specific, rather than uniform industry phenomenon. Lack of progress in conventional technologies may be the result, rather than the stimulus, of a forecast that the conventional technology is maturing, and some firms demonstrated the ability to wring far greater levels of performance from existing component technologies than other firms. Attacking entrant firms evidenced a distinct disadvantage versus incumbent firms in developing and using new component technologies. Firms pursuing aggressive Scurve switching strategies in component technology development gained no strategic advantage over firms whose strategies focused on extending the life of established component technologies. 相似文献
1000.
FRED F. EASTON DONALD F. ROSSIN WILLIAM S. BORDERS 《Production and Operations Management》1992,1(2):159-174
The persistent shortage of nurses adversely affects the productivity, quality of care, and operating costs in most acute care hospitals. Aggravating the shortage are high nurse turnover rates, approaching 200% in some institutions. Policies to ensure adequate staffing levels and provide more attractive work schedules are alleged to improve nurse retention. However, their cost is seldom discussed. We compared expected nursing expense and workforce requirements to staff eight medical and surgical nursing units of a large hospital for 1 month, under 12 different scheduling policies alleged to improve turnover. Using simulation and an integrated staffing and scheduling methodology, we found that the expected nursing wages and workforce requirements for some policies differed by as much as 33%. In this hospital, the expected labor costs for certain policies could erode the benefits expected from improved retention. In contrast, other policies appear to allow high utilization of nursing resources, enhancing the expected benefits of reduced turnover with significant reductions in expenses for labor, recruiting, training, and fringe benefits. 相似文献