全文获取类型
收费全文 | 171篇 |
免费 | 5篇 |
专业分类
管理学 | 53篇 |
民族学 | 1篇 |
人口学 | 12篇 |
丛书文集 | 1篇 |
理论方法论 | 8篇 |
综合类 | 5篇 |
社会学 | 82篇 |
统计学 | 14篇 |
出版年
2023年 | 1篇 |
2021年 | 1篇 |
2020年 | 5篇 |
2019年 | 4篇 |
2018年 | 6篇 |
2017年 | 5篇 |
2016年 | 9篇 |
2015年 | 6篇 |
2014年 | 9篇 |
2013年 | 16篇 |
2012年 | 10篇 |
2011年 | 11篇 |
2010年 | 10篇 |
2009年 | 8篇 |
2008年 | 11篇 |
2007年 | 9篇 |
2006年 | 6篇 |
2005年 | 9篇 |
2004年 | 7篇 |
2003年 | 6篇 |
2002年 | 5篇 |
2001年 | 6篇 |
2000年 | 4篇 |
1999年 | 4篇 |
1997年 | 1篇 |
1996年 | 3篇 |
1994年 | 1篇 |
1991年 | 1篇 |
1985年 | 1篇 |
1975年 | 1篇 |
排序方式: 共有176条查询结果,搜索用时 15 毫秒
41.
42.
43.
Many Western European countries, and especially the larger cities within these countries, are making a transition towards super-diversity. This shift towards super-diversity is also characterised by a growth of the phenomenon of transmigration, whereby people frequently move back and forth across borders. The social life of transmigrants is not only oriented towards their country of residence, but also consists of complex networks beyond boundaries. Transmigrants constantly shift between different modus operandi and between different visible and invisible, local and global networks. Many transmigrants face a high risk of social vulnerability and are overrepresented in the client population of urban social services. Although much research has been done on transmigration on the one hand, and on international social work on the other hand, the effect of transmigration on social workers and on social work practice is still under-investigated. Based on social work research in Brussels and Antwerp, the authors research the challenges transmigration poses to social work. They demonstrate that there is a difference in perspective between the translocal and transnational lives of transmigrants on the one hand versus the locally rooted practices of social workers on the other hand. Using this analysis as a springboard, they identify a number of avenues for additional inquiry in this field. 相似文献
44.
Heidi J. Renninger Sahil Wadhwa Frank J. Gallagher Dirk Vanderklein Karina V. R. Schäfer 《Urban Ecosystems》2013,16(2):247-263
The value of urban green space has become an increasingly controversial issue. In particular, development of novel vegetative assemblages on vacant lands may have many formerly unrecognized benefits. However, questions remain regarding the functional impairment of these assemblages due to degraded soils. We investigated the effects of elevated concentrations of soil metals on allometry and photosynthetic capacity of naturally colonized poplars (Populus deltoides Michx.) growing at Liberty State Park, New Jersey. We found that allometries of harvested trees did not differ significantly between the low metal load (LML) and high metal load (HML) sites suggesting that metal contamination did not negatively affect carbon allocation patterns of the target species. Likewise, photosynthetic parameters did not differ significantly between the LML and HML sites, suggesting that soil metal contamination did not negatively affect photosynthetic capacity. However, trees from the LML site were significantly younger for a given size than trees from the HML site. Trees from the medium metal load site (MML) differed significantly in allometry and photosynthetic parameters from the other two sites suggesting other edaphic and ecological factors are a stronger driver for carbon allocation patterns and photosynthetic capacity in these trees. Taken together, this research suggests that sapling establishment and growth may be impaired by heavy metals and that trees in HML sites may incur more maintenance costs than trees in LML sites. However, given enough time, poplars can provide considerable rehabilitation of urban brownfields, particularly those that exhibit soil metal contamination. 相似文献
45.
46.
We present a method of rank-optimal weighting which can be used to explore the best possible position of a subject in a ranking based on a composite indicator by means of a mathematical optimization problem. As an example, we explore the dataset of the OECD Better Life Index and compute for each country a weight vector which brings it as far up in the ranking as possible with the greatest advance of the immediate rivals. The method is able to answer the question “What is the best possible rank a country can achieve with a given set of weighted indicators?” Typically, weights in composite indicators are justified normatively and not empirically. Our approach helps to give bounds on what is achievable by such normative judgments from a purely output-oriented and strongly competitive perspective. The method can serve as a basis for exact bounds in sensitivity analysis focused on ranking positions. In the OECD Better Life Index data we find that 19 out the 36 countries in the OECD Better Life Index 2014 can be brought to the top of the ranking by specific weights. We give a table of weights for each country which brings it to its highest possible position. Many countries achieve their best rank by focusing on their strong dimensions and setting the weights of many others to zero. Although setting dimensions to zero is possible in the OECD’s online tool, this contradicts the idea of better life being multidimensional in essence. We discuss modifications of the optimization problem which could take this into account, e.g. by allowing only a minimal weight of one. Methods to find rank-optimal weights can be useful for various multidimensional datasets like the ones used to rank universities or employers. 相似文献
47.
48.
Schematically one can distinguish two traditions related to ethnic statistics in Europe. In France, Germany and most southern European countries, the dominant statistical categorisations merely distinguish individuals on the basis of their nationality. In contrast, most northern European countries have been producing data on the ethnic and/or foreign origin of their populations. Belgium is caught somewhere in between these two traditions. The French speaking part of Belgium tends to follow the French tradition of refusing ethnic categorisation, while the Flemish try to copy the Dutch model in distinguishing “allochthones” and “autochthones.” This contribution offers an analysis of the construction of ethnic categories as it has been undertaken in the Dutch context and (partially) imported in Belgium. 相似文献
49.
Nienke Liebregts Peggy van der Pol Ron de Graaf Margriet van Laar Wim van den Brink Dirk J. Korf 《Journal of youth studies》2015,18(5):617-633
Many cannabis users ‘mature out’ of their drug use, and factors of cannabis use cessation have been identified. However, very little in-depth knowledge is available about the mechanisms underlying this phenomenon. Criminological studies have gained interesting insights in desistance from crime, yet these perspectives are rarely used in drug research. This qualitative, three-year longitudinal study explored the processes involved in desistance from frequent cannabis use for young adults. Using a narrative approach, desisters (frequent users who successfully quit their cannabis use) and persisters (frequent users with a persistent desire and unsuccessful attempts to quit) were compared. In the course of the study, desisters mainly exhibited increasing agency and goal setting, established strategies to achieve these goals, and could envision another self. Desistance was generally induced by life events that became turning points. Persisters experienced largely similar events, but lacked goals and strategies and held external factors responsible for their life course and failed quit attempts. Identity change is at the core of desistance from frequent cannabis use, and the meaning-giving to life events and experiences is essential. Agency is a necessary ingredient for desistance, develops over time and through action, and leads to a new drug-free identity with desistance in turn increasing agency. 相似文献
50.
Tobias Wagner Christoph Bröcker Nicolas Saba Dirk Biermann Anton Matzenmiller Kurt Steinhoff 《AStA Advances in Statistical Analysis》2010,94(4):389-404
In this paper, measurements from experiments and results of a finite element analysis (FEA) are combined in order to compute accurate empirical models for the temperature distribution before a thermomechanically coupled forming process. To accomplish this, Design and Analysis of Computer Experiments (DACE) is used to separately compute models for the measurements and the functional output of the FEA. Based on a hierarchical approach, a combined model of the process is computed. In this combined modelling approach, the model for the FEA is corrected by taking into account the systematic deviations from the experimental measurements. The large number of observations based on the functional output hinders the direct computation of the DACE models due to the internal inversion of the correlation matrix. Thus, different techniques for identifying a relevant subset of the observations are proposed. The application of the resulting procedure is presented, and a statistical validation of the empirical models is performed. 相似文献