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231.
Ralph E. Steuer Maximilian Wimmer Markus Hirschberger 《Zeitschrift für Betriebswirtschaft》2013,83(1):61-85
Over 60 years ago, Markowitz introduced the mean-variance efficient frontier to finance. While mean-variance is still the predominant model in portfolio selection, it has endured many criticisms. One serious one is that it does not allow for additional criteria. The difficulty is that the efficient frontier becomes a surface. With it now possible to compute such a surface, we provide an overview on how Markowitz’s risk-return (bi-criterion) portfolio selection can be extended to tri-criterion portfolio selection. With a focus on the geometry of the extension, many graphs are used to illustrate. 相似文献
232.
Tytti P. Pasanen Markus Keski-Säntti Petri Hilli Tiina Ristikari Timo Ståhl 《Child & Family Social Work》2023,28(3):858-868
Adolescents growing up outside their birth homes are at major risk for multiple adversities in early adulthood, including low education and unemployment. The transition from out-of-home placement to independent living overlaps with the transition from school to work and higher education. However, the support during this critical phase is often inadequate. Adolescents ageing out of care are also more likely to have faced adversities in their birth families. Yet, the interplay between different risk factors and having aged out of care has gained little attention. This study aimed to assess known risk factors for low education and unstable employment and their interaction with ageing out of care, controlling for birth-home-related adversities. We assessed this topic using logistic and linear regression modelling based on the Finnish birth cohort 1987 (n = 59 476) registry. Our analysis showed that obtaining upper secondary and higher education was much less likely among those ageing out of care, and they had spent 52–80 fewer days annually in employment after graduation. Few interactions with other risk factors were, however, found. Efforts are needed to prevent inequalities in education and employment for those ageing out of care in the transition phase from school to work. 相似文献
233.
Kateryna Golovina;Markus Jokela; 《Population and development review》2024,50(4):1239-1266
Previous studies showed that worries about the economic situation and job security are associated with childbearing, but evidence is scarce on whether worries about other personal and social issues are also related to childbearing. Drawing on the German Socio-Economic Panel Study, this study examined the relationship between worries about various personal and social issues and the likelihood of having children. Based on exploratory factor analysis, worries were categorized into social/environment and economy/safety factors. Cox regression models showed that social/environment worries were associated with a decreased likelihood of having children, even after adjusting for sociodemographic characteristics, personality traits, and political attitudes. Among specific worries, concerns about environmental protection, climate change, personal health, peace, immigration to Germany, and hostility toward immigrants were linked to a decreased likelihood of having children. Notably, worries about the economy in general were strongly associated with a reduced probability of becoming a parent among childless individuals, with a 25 percent lower likelihood for those highly worried about it. Similarly, childless individuals highly worried about climate change exhibit a 16 percent lower likelihood of parenthood. Our findings highlight the role of other worries in childbearing in addition to economic uncertainty and suggest that fertility decreases when the future is perceived as uncertain. 相似文献
234.
Markus Sauerberg;Florian Bonnet;Carlo Giovanni Camarda;Pavel Grigoriev; 《Population and development review》2024,50(4):1401-1427
The conventional approach to gauging mortality convergence in Europe relies on life expectancy estimates (e0${{e}^0}$) at the national level. However, mortality can differ within countries significantly. To better apprehend whether Europe's mortality patterns have been converging or diverging over recent decades, we must shift our focus to regional mortality data. Using data from statistical offices, we present annual estimates for 420 regions in 16 EU countries from 1995 to 2019. In our empirical analysis, we examined whether regions with initially high mortality levels caught up with low-mortality regions, and we investigated changes in the standard deviation of Europe's regional distribution over time. Indeed, mortality variation has generally decreased from 1995 to 2019 due to larger gains in for regions with initially high mortality levels. The convergence phase took place mostly during the first half of the entire time period analyzed. Over more recent periods, however, we observe more heterogeneity in the development of . Some advantaged regions realized further gains in , even as improvements slowed for more disadvantaged regions. In conclusion, our analysis underscores the importance of addressing widening health inequalities. Policies should target disadvantaged regions to retard mortality divergence across Europe. 相似文献
235.
Stephen Leider Tanya Rosenblat Markus M. Mbius Quoc‐Anh Do 《Journal of the European Economic Association》2010,8(1):120-138
We conduct a field experiment in a large real‐world social network to examine how subjects expect to be treated by their friends and by strangers who make allocation decisions in modified dictator games. Although recipients' beliefs accurately account for the extent to which friends will choose more generous allocations than strangers (i.e., directed altruism), recipients are not able to anticipate individual differences in the baseline altruism of allocators (measured by giving to an unnamed recipient, which is predictive of generosity toward named recipients). Recipients who are direct friends with the allocator, or even recipients with many common friends, are no more accurate in recognizing intrinsically altruistic allocators. Recipient beliefs are significantly less accurate than the predictions of an econometrician who knows the allocator's demographic characteristics and social distance, suggesting recipients do not have information on unobservable characteristics of the allocator. (JEL: C73, C91, D64) 相似文献
236.
Markus Schmitz 《Organisationsberatung, Supervision, Coaching》2012,19(2):151-165
Analyzing the own team and the social network of the organization are main sources for success of management in an organization. Therefore they are common themes in coaching. Analyzing and optimizing social systems are the main subjects of sociometry. So it bears a substantial an effective repertoire of methods which can efficiently enrich coaching methods and approaches. This article analyzes the impact and properties of sociometry and points out practical applications for coaching. 相似文献
237.
Christian Brock Markus Blut Heiner Evanschitzky Martin Ahlert Peter Kenning 《Zeitschrift für Betriebswirtschaft》2011,81(2):57-76
This paper provides a comprehensive assessment of customers who experience a service failure and do not voice their dissatisfaction to the provider (?non-complainer‘). This group of customers has been largely neglected by complaint research; although first studies indicate that only a small number of customers being dissatisfied voice their complaint to the firm. To address this issue, this research intends to 1) examine the impact of negative critical incidents on customer loyalty and 2) contribute to a better understanding of the role of customer recovery. Based on these analyses, 3) the relevance of complaint stimulation is derived. In doing so, management receives valuable information on how to deal with noncomplainers. 相似文献
238.
239.
Feng Cheng Markus Ettl Yingdong Lu David D. Yao 《Production and Operations Management》2012,21(4):668-681
We study a hybrid push–pull production system with a two‐stage manufacturing process, which builds and stocks tested components for just‐in‐time configuration of the final product when a specific customer order is received. The first production stage (fabrication) is a push process where parts are replenished, tested, and assembled into components according to product‐level build plans. The component inventory is kept in stock ready for the final assembly of the end products. The second production stage (fulfillment) is a pull‐based assemble‐to‐order process where the final assembly process is initiated when a customer order is received and no finished goods inventory is kept for end products. One important planning issue is to find the right trade‐off between capacity utilization and inventory cost reduction that strives to meet the quarter‐end peak demand. We present a nonlinear optimization model to minimize the total inventory cost subject to the service level constraints and the production capacity constraints. This results in a convex program with linear constraints. An efficient algorithm using decomposition is developed for solving the nonlinear optimization problem. Numerical results are presented to show the performance improvements achieved by the optimized solutions along with managerial insights provided. 相似文献
240.