全文获取类型
收费全文 | 1570篇 |
免费 | 71篇 |
专业分类
管理学 | 151篇 |
民族学 | 20篇 |
人口学 | 260篇 |
丛书文集 | 1篇 |
理论方法论 | 88篇 |
综合类 | 18篇 |
社会学 | 729篇 |
统计学 | 374篇 |
出版年
2023年 | 28篇 |
2022年 | 24篇 |
2021年 | 34篇 |
2020年 | 79篇 |
2019年 | 87篇 |
2018年 | 167篇 |
2017年 | 152篇 |
2016年 | 126篇 |
2015年 | 61篇 |
2014年 | 97篇 |
2013年 | 304篇 |
2012年 | 126篇 |
2011年 | 51篇 |
2010年 | 48篇 |
2009年 | 42篇 |
2008年 | 44篇 |
2007年 | 24篇 |
2006年 | 21篇 |
2005年 | 11篇 |
2004年 | 18篇 |
2003年 | 7篇 |
2002年 | 18篇 |
2001年 | 8篇 |
2000年 | 11篇 |
1999年 | 6篇 |
1998年 | 6篇 |
1997年 | 4篇 |
1996年 | 7篇 |
1995年 | 1篇 |
1994年 | 5篇 |
1993年 | 2篇 |
1992年 | 5篇 |
1991年 | 4篇 |
1987年 | 1篇 |
1983年 | 1篇 |
1980年 | 1篇 |
1978年 | 2篇 |
1977年 | 2篇 |
1976年 | 3篇 |
1973年 | 1篇 |
1972年 | 1篇 |
1968年 | 1篇 |
排序方式: 共有1641条查询结果,搜索用时 62 毫秒
951.
Martin Böhm Jiří Sgall Rob van Stee Pavel Veselý 《Journal of Combinatorial Optimization》2017,34(3):810-828
Online Bin Stretching is a semi-online variant of bin packing in which the algorithm has to use the same number of bins as an optimal packing, but is allowed to slightly overpack the bins. The goal is to minimize the amount of overpacking, i.e., the maximum size packed into any bin.We give an algorithm for Online Bin Stretching with a stretching factor of 1.5 for any number of bins. We build on previous algorithms and use a two-phase approach. However, our analysis is technically more complicated and uses amortization over the bins with the help of two weight functions. 相似文献
952.
953.
P. Martínez-Camblor S. Pérez-Fernández S. Díaz-Coto 《Journal of applied statistics》2019,46(9):1550-1566
The use of the area under the receiver-operating characteristic, ROC, curve (AUC) as an index of diagnostic accuracy is overwhelming in fields such as biomedical science and machine learning. It seems that a larger AUC value has become synonymous with a better performance. The functional transformation of the marker values has been proposed in the specialized literature as a procedure for increasing the AUC and therefore the diagnostic accuracy. However, the classification process is based on some regions (classification subsets) which support the decision made; one subject is classified as positive if its marker is within this region and classified as negative otherwise. In this paper we study the capacity of improving the classification performance of univariate biomarkers via functional transformations and the impact of this transformation on the final classification regions based on a real-world dataset. Particularly, we consider the problem of determining the gender of a subject based on the Mode frequency of his/her voice. The shape of the cumulative distribution function of this characteristic in both the male and the female groups makes the resulting classification problem useful for illustrating the differences between having useful diagnostic rules and obtaining an optimal AUC value. Our point is that improving the AUC by means of a functional transformation can produce classification regions with no practical interpretability. We propose to improve the classification accuracy by making the selection of the classification subsets more flexible while preserving their interpretability. Besides, we provide different graphical approximations which allow us a better understanding of the classification problem. 相似文献
954.
Álvarez-Gálvez Javier Rodero-Cosano María Luisa Salinas-Pérez José A. Gómez-Baya Diego 《Social indicators research》2019,141(2):873-893
Social Indicators Research - In this study, we disentangle the complex relationship between structural and intermediary social determinants of health in Andalusia (Spain) after the period of... 相似文献
955.
Elizalde-San Miguel Begoña Díaz Gandasegui Vicente Sanz García Maria T. 《Social indicators research》2019,142(1):387-409
Social Indicators Research - This paper presents the Family Policy Index (XFPI), an analytical tool designed to measure and compare different models of countries’ provision of educational... 相似文献
956.
Rogelio Gómez García Margarita Alonso Sangregorio María Lucía Llamazares Sánchez 《Journal of social service research》2019,45(2):207-219
Burnout has been considered important to understanding the well-being of social workers and the quality of the services they render. Despite the ample international usage of the Maslach Burnout Inventory, its psychometric properties have come into question and alternative models of measuring the inventory have been suggested. The purpose of this study was to examine the psychometric properties and the applicability of a Spanish version of the Maslach Burnout Inventory-Human Services Survey (MBI-HSS) in an incidental sample of 947 social workers. Three alternative models of the MBI-HSS were tested for the purpose of identifying the most suitable model for measuring burnout in Spain. The confirmatory factor analysis supported the theory that the model of three correlated factors was superior to alternative models of one and two factors. The structure of three factors (emotional exhaustion, depersonalization, and personal accomplishment) and 19 items showed the best adjustment and a suitable internal consistency of the dimensions of the MBI-HSS. These findings demonstrate that the MBI-HSS has validity and reliability acceptable for measuring burnout in social workers, providing valuable information to the managers of social services in order to reduce burnout among social workers. The limitations of the study and recommendations for future investigation are emphasized. 相似文献
957.
In this article, we analyse the possibility of extending the Moulin theorem to Condorcet voting correspondences. Moulin (1988)
established that every Condorcet voting function suffers from the No Show Paradox, or Abstention Paradox, which means that
in some voting situations some voters would achieve a better result by abstaining (in other words, could manipulate the election
by abstaining). This problem is similar to that of extending the Gibbard–Satterthwaite theorem on voting manipulation through
casting an insincere ballot to voting correspondences. The main result of the paper states that for every Condorcet voting
correspondence there are situations in which every optimistic or pessimistic voter with some preferences could manipulate
the election by abstaining. Another result states, by counterexample, that some Condorcet voting correspondences are free
from the Abstention Paradox from the point of view of other types of voters. 相似文献
958.
There exist an increasing number of studies that demonstrate the necessity to evaluate the processes which characterize a program and guarantee its implementation and evaluation. This paper deals with the implementation of a program designed to improve the acculturation of immigrant families in Spain (EU). Implementation followed a process that has proved successful in other settings, but is being applied here for the first time. Qualitative and quantitative measures are employed to assess each stage of implementation, with a particular emphasis on fidelity to program design. The intent was to guide effective revision of the program, and to establish it in a form that can be implemented on a larger scale. 相似文献
959.
Using a Spanish panel of large establishments, we test the reliability of the exit-voice theory to understand absenteeism (making the distinction between voluntary and involuntary absences). In the Spanish institutional framework, union direct voice (as opposed to union representative voice) is proxied by the existence of a collective agreement at the firm level. We find a positive influence of union direct voice on involuntary absenteeism, which is consistent with a greater protection of workers’ rights through that institution. We do not find a robust effect of direct voice on voluntary absenteeism. The first result lends support to the exit-voice theory but not the second one. Our interpretation underlines the need for re-construction of the exit-voice theory as a more general and precise one. 相似文献
960.
This research note presents briefly the development of Education for Social Work in Spain. The year 2008 has marked the twenty-fifth anniversary of its incorporation into Spanish universities as an undergraduate degree. In addition, the academic year 2008–2009 has seen the introduction of the qualification, Doctor of Social Work. It also provides some thoughts about the academic situation and status of social work at a global level as a result of the domination of the English and Spanish languages. It also compares the development of social work with studies in other countries, and different forms of understanding of the basis of social work in Europe. 相似文献