全文获取类型
收费全文 | 2388篇 |
免费 | 86篇 |
国内免费 | 1篇 |
专业分类
管理学 | 765篇 |
民族学 | 19篇 |
人才学 | 1篇 |
人口学 | 96篇 |
丛书文集 | 126篇 |
理论方法论 | 127篇 |
综合类 | 651篇 |
社会学 | 248篇 |
统计学 | 442篇 |
出版年
2023年 | 8篇 |
2022年 | 15篇 |
2021年 | 29篇 |
2020年 | 53篇 |
2019年 | 50篇 |
2018年 | 50篇 |
2017年 | 51篇 |
2016年 | 50篇 |
2015年 | 64篇 |
2014年 | 97篇 |
2013年 | 270篇 |
2012年 | 141篇 |
2011年 | 171篇 |
2010年 | 102篇 |
2009年 | 132篇 |
2008年 | 119篇 |
2007年 | 112篇 |
2006年 | 96篇 |
2005年 | 75篇 |
2004年 | 65篇 |
2003年 | 67篇 |
2002年 | 76篇 |
2001年 | 73篇 |
2000年 | 55篇 |
1999年 | 47篇 |
1998年 | 30篇 |
1997年 | 34篇 |
1996年 | 21篇 |
1995年 | 26篇 |
1994年 | 33篇 |
1993年 | 24篇 |
1992年 | 32篇 |
1991年 | 23篇 |
1990年 | 28篇 |
1989年 | 21篇 |
1988年 | 27篇 |
1987年 | 16篇 |
1986年 | 22篇 |
1985年 | 13篇 |
1984年 | 14篇 |
1983年 | 18篇 |
1982年 | 10篇 |
1981年 | 3篇 |
1980年 | 10篇 |
1979年 | 1篇 |
1978年 | 1篇 |
排序方式: 共有2475条查询结果,搜索用时 296 毫秒
51.
In this article, we evaluate the relationship between supply chain design decisions and supply chain disruption risk. We explore two supply chain design strategies: (i) the dispersion of supply chain partners to reduce supply chain disruption risk versus (ii) the co‐location of supply chain partners to reduce supply chain disruption risk. In addition, we assess supply chain disruption risk from three perspectives: the inbound material flow from the supplier (supply side), the internal production processes (internal), and the outbound material flow to the customer (customer side) as a disruption can occur at any of these locations. We measure disruption risk in terms of stoppages in flows, reductions in flow, close calls (disruptions that were prevented at the last minute), disruption duration (time until normal operation flow was restored), and the spread of disruptions all the way through the supply chain. We use seemingly unrelated regression (SUR) to analyze our data, finding that lead times, especially supply side lead times, are significantly associated with higher levels of supply chain disruption risk. We find co‐location with suppliers appears to have beneficial effects to the reduction of disruption duration, and, overall supply side factors have a higher impact when it comes to supply chain disruption risk than comparable customer side factors. 相似文献
52.
以双电机驱动自同步振动磨为研究对象,对其进行简化处理,建立力学模型。通过对其施加X,y方向的简谐激
振力,建立无阻尼系统强迫振动和有阻尼系统强迫振动的数学模型,在此基础上,确定Rayleigh阻尼的常数α和β,利用
有限元ANSYS软件进行瞬态动力学分析,研究其在动载荷作用下的变形情况。研究结果表明:在工况频率16 Hz下,节
点运动轨迹更接近圆形,距理想粉碎效果的圆形轨迹较近,粉碎效果较好,进入稳定期的时间较快;在共振频率42 Hz
下,节点轨迹振幅更大,进入稳定期较慢,阻尼对振动的衰减作用较强;不同阻尼比对振动的衰减作用成正比关系。因
此,可以通过控制阻尼比等参数获得更有利的研磨效果,提高研磨效率。 相似文献
53.
基于SWOT分析的喇叭河森林公园旅游产品策划 总被引:2,自引:0,他引:2
基于SWOT分析,喇叭河森林公园既有区位、资源等方面的旅游开发优势,又有生态环境脆弱、资金投入不足、市场开拓不足等方面劣势;既有发展机遇,又面临多方面的挑战.因此,喇叭河森林公园旅游产品策划就应基于锥形的旅游产品结构体系,以"市场导向,资源依托"为策划原则,引进品牌战略,构建多样的项目集群,并实行多元化的经营模式,以吸引更多的游客. 相似文献
54.
Lund I 《Journal of gambling studies / co-sponsored by the National Council on Problem Gambling and Institute for the Study of Gambling and Commercial Gaming》2007,23(4):409-419
The study takes a closer look at at-risk gamblers, with the objective to see how they differ from no-risk gamblers. The data
comes from a national gambling survey in 2002, and the age group is 15–74 years. The sample consists of 4188 current gamblers
with no current gambling problems or pathology. The analysis includes cross-tabulations and a logistic regression. The results
show that at-risk gamblers differed substantially from no-risk gamblers in terms of demographic characteristics, gambling
behaviour and the presence of other assumed risk factors. Demographic segments with a higher risk of falling into the at-risk
group are men, young people, divorced or single people, and non-western immigrants. Furthermore, gambling problems in the
family, beginners luck and misconceptions about winning chances significantly increased the odds for at-risk gambling. The
study concludes that at-risk gamblers deserve more attention from research, that their similarity with problem gamblers increases
the likelihood that many of them will eventually develop a gambling problem, and that their tendency to be superstitious about
winning chances might be exploited in preventive work. 相似文献
55.
56.
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
57.
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
58.
The present study examined the career advancement prospects of MIS and non-MIS employees, as well as the relationships of career advancement prospects with job performance evaluations, job satisfaction, career satisfaction, and organizational commitment for MIS and non-MIS professionals and managers. Participants included 134 MIS professionals and managers and 397 non-MIS professionals and managers of a large communications company. The results provided no evidence that MIS employees experience more restricted career advancement prospects than non-MIS employees. In addition, job performance evaluations generally had positive effects on career advancement prospects; career advancement prospects had a number of positive effects on job satisfaction, career satisfaction, and organizational commitment; and job satisfaction and career satisfaction had positive effects on organizational commitment. These findings are related to prior research, suggestions for future research are offered, and implications for the management of MIS employees are identified. 相似文献
59.
In an earlier paper [11], the problems of rank reversals and invalid composite priorities in AHP were addressed by modifications to the AHP procedure. That solution was subsequently criticized [5]. In this paper, we rebut these criticisms, and we show how rank reversals in AHP can arise merely from the process of normalizing local priorities. 相似文献
60.
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