全文获取类型
收费全文 | 1642篇 |
免费 | 19篇 |
国内免费 | 8篇 |
专业分类
管理学 | 292篇 |
民族学 | 15篇 |
人口学 | 197篇 |
丛书文集 | 11篇 |
理论方法论 | 126篇 |
综合类 | 55篇 |
社会学 | 563篇 |
统计学 | 410篇 |
出版年
2024年 | 16篇 |
2023年 | 16篇 |
2022年 | 17篇 |
2021年 | 12篇 |
2020年 | 35篇 |
2019年 | 47篇 |
2018年 | 47篇 |
2017年 | 81篇 |
2016年 | 51篇 |
2015年 | 33篇 |
2014年 | 42篇 |
2013年 | 317篇 |
2012年 | 72篇 |
2011年 | 60篇 |
2010年 | 33篇 |
2009年 | 33篇 |
2008年 | 40篇 |
2007年 | 45篇 |
2006年 | 33篇 |
2005年 | 48篇 |
2004年 | 38篇 |
2003年 | 24篇 |
2002年 | 28篇 |
2001年 | 47篇 |
2000年 | 31篇 |
1999年 | 30篇 |
1998年 | 21篇 |
1997年 | 22篇 |
1996年 | 22篇 |
1995年 | 15篇 |
1994年 | 22篇 |
1993年 | 18篇 |
1992年 | 16篇 |
1991年 | 10篇 |
1990年 | 14篇 |
1989年 | 24篇 |
1988年 | 21篇 |
1987年 | 17篇 |
1986年 | 18篇 |
1985年 | 23篇 |
1984年 | 18篇 |
1983年 | 18篇 |
1982年 | 17篇 |
1981年 | 20篇 |
1980年 | 12篇 |
1978年 | 4篇 |
1977年 | 4篇 |
1976年 | 7篇 |
1973年 | 6篇 |
1972年 | 4篇 |
排序方式: 共有1669条查询结果,搜索用时 0 毫秒
51.
Yacov Y. Haimes 《Risk analysis》2011,31(8):1175-1186
This article highlights the complexity of the quantification of the multidimensional risk function, develops five systems‐based premises on quantifying the risk of terrorism to a threatened system, and advocates the quantification of vulnerability and resilience through the states of the system. The five premises are: (i) There exists interdependence between a specific threat to a system by terrorist networks and the states of the targeted system, as represented through the system's vulnerability, resilience, and criticality‐impact. (ii) A specific threat, its probability, its timing, the states of the targeted system, and the probability of consequences can be interdependent. (iii) The two questions in the risk assessment process: “What is the likelihood?” and “What are the consequences?” can be interdependent. (iv) Risk management policy options can reduce both the likelihood of a threat to a targeted system and the associated likelihood of consequences by changing the states (including both vulnerability and resilience) of the system. (v) The quantification of risk to a vulnerable system from a specific threat must be built on a systemic and repeatable modeling process, by recognizing that the states of the system constitute an essential step to construct quantitative metrics of the consequences based on intelligence gathering, expert evidence, and other qualitative information. The fact that the states of all systems are functions of time (among other variables) makes the time frame pivotal in each component of the process of risk assessment, management, and communication. Thus, risk to a system, caused by an initiating event (e.g., a threat) is a multidimensional function of the specific threat, its probability and time frame, the states of the system (representing vulnerability and resilience), and the probabilistic multidimensional consequences. 相似文献
52.
53.
Concordance correlation coefficient (CCC) is one of the most popular scaled indices used to evaluate agreement. Most commonly, it is used under the assumption that data is normally distributed. This assumption, however, does not apply to skewed data sets. While methods for the estimation of the CCC of skewed data sets have been introduced and studied, the Bayesian approach and its comparison with the previous methods has been lacking. In this study, we propose a Bayesian method for the estimation of the CCC of skewed data sets and compare it with the best method previously investigated. The proposed method has certain advantages. It tends to outperform the best method studied before when the variation of the data is mainly from the random subject effect instead of error. Furthermore, it allows for greater flexibility in application by enabling incorporation of missing data, confounding covariates, and replications, which was not considered previously. The superiority of this new approach is demonstrated using simulation as well as real‐life biomarker data sets used in an electroencephalography clinical study. The implementation of the Bayesian method is accessible through the Comprehensive R Archive Network. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
54.
Luca Moraschini Irene Passalacqua Monica Fabbrini Immaculada Margarit Y Ros Fabio Rigat 《Pharmaceutical statistics》2015,14(3):189-197
Opsonophagocytic killing assays (OPKA) are routinely used for the quantification of bactericidal antibodies in blood serum samples. Quantification of the OPKA readout, the titer, provides the basis for the statistical analysis of vaccine clinical trials having functional immune response endpoints. Traditional OPKA titers are defined as the maximum serum dilution yielding a predefined bacterial killing threshold value, and they are estimated by fitting a dose‐response model to the dilution‐killing curve. This paper illustrates a novel definition of titer, the threshold‐free titer, which preserves biological interpretability while not depending on any killing threshold or on a postulated shape of the dose‐response curve. These titers are shown to be more precise than the traditional threshold‐based titers when using simulated and experimental group B streptococcus OPKA experimental data. Also, titer linearity is shown to be not measurable when using threshold‐based titers, whereas it becomes measurable using threshold‐free titers. The biological interpretability and operational characteristics demonstrated here indicate that threshold‐free titers are an appropriate tool for the routine analysis of OPKA data. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
55.
The Japanese “just-in-time with kanban” technique reduces in-process inventory to absolute minimal levels, in concert with the Japanese belief that inventory is an unnecessary evil. Due to the success of Japanese firms that employ this type of system, American firms would like to import this technique and emulate Japanese successes. But this Japanese success may be attributable not only to the just-in-time with kanban technique but also to the production environment in which the technique is employed. This paper simulates the just-in-time with kanban technique for a multiline, multistage production system in order to determine its adaptability to an American production environment that might include such characteristics as variable processing times, variable master production scheduling, and imbalances between production stages. The results have practical implications for those firms considering adoption of the Japanese technique. 相似文献
56.
We consider the batch production of hierarchical product lines in raw material industry where the whole or parts of multiple customer orders may be consolidated and processed in the same batch if their product specifications are compatible. The objective of the problem is to find maximum possible number of batches completely filled up to their capacity. The compatibility relationship among product specifications is represented by a graph called the compatibility graph. If the compatibility graph is an arbitrary graph, the problem is proven to be NP-hard and belongs to Max SNP-hard class. We develop an optimum algorithm for an important subclass of the problem where the graph is a quasi-threshold graph which in fact is the case for producing hierarchical product lines that are often found in raw materials industry. 相似文献
57.
Since its inception, the concept of absorptive capacity has been closely linked with notions of organizational learning. Yet the precise nature of the relationship between these two concepts has never been established. This relationship is examined in a variety of ways, and it is suggested that the literature on these two concepts shares a conceptual affinity which needs to be delineated. It is suggested that absorptive capacity (a dynamic capability) is a concrete example of organizational learning that concerns an organization's relationship with new external knowledge. Using the 4I Model for organizational learning ( Crossan, M.M., Lane, H.W. and White, R.E. (1999 ). An organizational learning framework: from intuition to institution. Academy of Management Review, 24, 522–537) and Zahra and George's conceptualization of absorptive capacity ( Zahra, S.A. and George, G. (2002 ). Absorptive capacity: a review, reconceptualization, and extension. Academy of Management Review, 27, 185–203), this paper proposes an integration of the two concepts. 相似文献
58.
Merino Elena Manzaneque Montserrat Ramírez Yolanda 《Journal of Management and Governance》2019,23(3):577-604
Journal of Management and Governance - Following a stakeholder corporate governance perspective, we examine whether the characteristics of boards of directors (board size, separation of Chairman... 相似文献
59.
60.
于垲 《河南工程学院学报(社会科学版)》2010,25(2):39-41
随着中国经济社会的不断发展,分税制财政管理体制在运行中出现了一系列新的问题和矛盾.我国在未来新一轮税制改革的调整过程中,必须根据具体的因素法确定不同地区的"存量"比例,要不断弱化"存量"带来的束缚和限制,逐步解决现行制度设计中的种种问题和缺陷,要建立和完善科学的转移支付制度,明晰各级政府的财权和事权,同时要处理好现行"层级财政"的转换,以解决基层财政困难的问题. 相似文献