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91.
Students with college educated parents are more likely to attain higher levels of education than students of parents with lower levels of education. Past research has explained this favorable outcome as the result of advantageous placement and greater availability of educational resources. Using data from Add Health and AHAA, we find evidence that exposure to students of college educated parents at the school level and within courses increase the likelihood of four year college enrollment even after controlling for family background, achievement, and placement. We also found that exposure to students of college educated parents has especially strong positive effects on college enrollment for students whose own parents do not have a college degree. These findings suggest that greater exposure to students of highly educated parents at the school level and within courses partially explains the favorable educational attainment of students with college educated parents. 相似文献
92.
E. W. T. Ngai T. C. E. Cheng Kee‐hung Lai P. Y. F. Chai Y. S. Choi R. K. Y. Sin 《Production and Operations Management》2007,16(5):554-568
This paper presents a case study of the research and development of an RFID‐based traceability system in an aircraft engineering company in Hong Kong. We report the system design and implementation, and discuss our experiences and lessons learned. The aim of the RFID system is to effectively support the tracking and tracing of aeroplane repairable items in the company. The study reveals eight critical success factors for the successful implementation of RFID systems, namely, create strong internal and external motivation for improvement, stir up desire to keep abreast of the latest technology for global competitiveness, strive for cross organizational implementation, avoid major process changes/limit process changes, start with a small RFID project scope, facilitate equipment vendor's investment, use cost‐effectiveness reusable tags, and transfer RFID skills and knowledge from university to industry. We also summarize 13 lessons learned, including three lessons concerning RFID implementation at strategic level, six lessons at management level, and four lessons at operational level resulting from carrying out this project. Given the contextual details of the study, the lessons learned can help other firms to better anticipate the hurdles they will experience, and make them aware of the possible ways to cope with such difficulties before embarking on the journey of RFID implementation. 相似文献
93.
This paper contains results of a study into changes in rates of suicide in Australia in the 1970s and 1980s. The study found that there was a significant divergence of suicide mortality rates between males and females, with male rates increasing in the last twenty years and female rates showing a general decline. The increase in male rates was highest at ages under 30 and over 80 years of age. The differences in rates between marital status groups have remained large. The study also analysed birthplace differentials in suicides and included some data from overseas countries for comparisons. 相似文献
94.
Alley D Liebig P Pynoos J Banerjee T Choi IH 《Journal of gerontological social work》2007,49(1-2):1-18
Because many communities where older people live were not designed for their needs, older residents may require support to remain in the least restrictive environment. "Age-prepared communities" utilize community planning and advocacy to foster aging in place. "Elder-friendly communities" are places that actively involve, value, and support older adults, both active and frail, with infrastructure and services that effectively accommodate their changing needs. This paper presents an analysis of the literature and results of a Delphi study identifying the most important characteristics of an elder-friendly community: accessible and affordable transportation, housing, health care, safety, and community involvement opportunities. We also highlight innovative programs and identify how social workers can be instrumental in developing elder-friendly communities. 相似文献
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96.
RESERVE PRICE EFFECTS IN AUCTIONS: ESTIMATES FROM MULTIPLE REGRESSION‐DISCONTINUITY DESIGNS 下载免费PDF全文
We present evidence from 260,000 online auctions of second‐hand cars to identify the impact of public reserve prices on auction outcomes. We exploit multiple discontinuities in the relationship between reserve prices and vehicle characteristics to present causal regression‐discontinuity estimates of reserve price impacts. We find an increase in reserve price decreases the number of bidders, increases the likelihood the object remains unsold, and increases expected revenue conditional on sale. We then combine these estimates to calibrate the reserve price effect on the auctioneer's ex ante expected revenue. This reveals the auctioneer's reserve price policy to be locally optimal. (JEL D44, L11, L62) 相似文献
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99.
Lim S Ha J Choi SW Kang SG Shin YC 《Journal of gambling studies / co-sponsored by the National Council on Problem Gambling and Institute for the Study of Gambling and Commercial Gaming》2012,28(3):481-491
Several studies have reported that some dopaminergic receptor polymorphisms are associated with pathological gambling (PG). Considering that there are major race and ethnic group difference in dopaminergic polymorphisms, the result of genetic association studies should be confirmed in more homogeneous population to avoid problems of population stratification. The present study aimed to investigate whether selected polymorphisms in the dopamine receptors genes (DRD1, DRD2, DRD3, and DRD4) are associated with PG in Korean population which is consisted of only Korean ancestry. Subjects were 104 men with a diagnosis of PG and 114 unrelated age-matched normal control men. Genotyping was performed for the DRD1 gene -48 A/G, DRD2 gene TaqI A, DRD3 gene Ser9Gly, and DRD4 gene exon III variable number tandem repeat polymorphisms. The method of multifactor dimensionality reduction (MDR) was used to analyze gene-gene interactions. There were no differences in the frequencies of any studied polymorphisms between patients with PG and normal controls. MDR analysis did not show a significant effect of the 4 dopamine receptor gene polymorphisms on susceptibility to PG (P > 0.05). The present study suggests that the analyzed polymorphisms of the dopamine receptor genes might not be associated with PG in a Korean population. 相似文献
100.
Hispanics are now the largest minority group in the United States and their presence is likely to continue to expand. Little is known, however, about the correlates of Hispanic identity or the processes that are involved in its maintenance. We investigate these issues by ascertaining and then seeking to understand the various associations between reported racial identities and Hispanic ethnicity using data from the Current Population Surveys. Restricting the sample to individuals who are known to have demographic origins in Latin America, our results indicate that persons with African or Asian racial identifications are substantially less likely than whites or Others to also identify as Hispanic. Relative to the first generation, Hispanic identification declines and the racial differences increase in the second generation. The exceptions in this regard are Others for whom racial and Hispanic identifications are the most highly associated for both the first and second generations. These findings are interpreted as reflecting various social processes that are involved in the development and maintenance of racial and ethnic identities. Our results provide insight into the complex, social nature of Hispanic identification in modern America. 相似文献