首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   53篇
  免费   0篇
教育   22篇
科学研究   12篇
各国文化   1篇
体育   10篇
文化理论   6篇
信息传播   2篇
  2019年   3篇
  2018年   1篇
  2017年   2篇
  2016年   2篇
  2015年   4篇
  2014年   3篇
  2013年   5篇
  2012年   3篇
  2011年   2篇
  2010年   2篇
  2009年   2篇
  2008年   6篇
  2007年   1篇
  2006年   1篇
  2005年   1篇
  2002年   1篇
  2001年   1篇
  2000年   1篇
  1998年   2篇
  1995年   1篇
  1988年   1篇
  1986年   1篇
  1985年   1篇
  1984年   1篇
  1982年   1篇
  1978年   1篇
  1977年   1篇
  1974年   1篇
  1973年   1篇
排序方式: 共有53条查询结果,搜索用时 15 毫秒
41.
This paper provides fresh empirical evidence on technological innovation in the service sector, and highlights major similarities and differences with manufacturing. The main findings are the following. Technological innovation is quite a diffused and variegated phenomenon in market services. Engineering, technical consultancy, computing and software emerge as the most innovative sectors. Innovation expenditure per employee in these industries is rather close to the manufacturing average. Service firms as well as the manufacturing ones rely on a wide range of innovation sources. The acquisition and development of software and investment in machinery are the most cited. Investment, R&D and software are the major components of firms' innovation expenditure. Both in services and manufacturing the most important objective of firms' innovation strategies consist of improving service/product quality, increasing market shares and reducing production costs. Major obstacles for introducing technological innovation in services, as well as in manufacturing, are of an economic nature—i.e. lack of appropriate sources of finance and cost of innovation too high. Technological information is drawn mainly from in-house production departments as well as from outside suppliers of equipment, clients and customers. Again this is a pattern which is quite similar to the one found in the manufacturing sector. Finally, in the near future the importance of technology for firms' performance is expected to increase in all service industries. Overall, service and manufacturing sectors show more similarities than differences with respect to some basic dimensions of innovation processes.  相似文献   
42.
This article shows how (Association) football contributed to the development of a Newfoundland national identity in the last quarter of the nineteenth century. Some clubs, the Natives and later Terra Nova and Cabot, went even further: they sought to overcome denominational cleavages, something the Newfoundland Natives’ Society had tried to do in the political field in the 1840s. In the end, their effort was unsuccessful because football on the island, in replicating the English model, came to be dominated by clubs formed by the alumni of the local denominational schools.  相似文献   
43.
The purpose of this study was to explore the relationships between mechanical power, thrust power, propelling efficiency and sprint performance in elite swimmers. Mechanical power was measured in 12 elite sprint male swimmers: (1) in the laboratory, by using a whole-body swimming ergometer (W'TOT) and (2) in the pool, by measuring full tethered swimming force (FT) and maximal swimming velocity (Vmax): W'T = FT · Vmax. Propelling efficiency (ηP) was estimated based on the “paddle wheel model” at Vmax. Vmax was 2.17 ± 0.06 m · s?1, ηP was 0.39 ± 0.02, W'T was 374 ± 62 W and W'TOT was 941 ± 92 W. Vmax was better related to W'T (useful power output: R = 0.943, P < 0.001) than to W'TOT (total power output: R = 0.744, P < 0.01) and this confirms the use of the full tethered test as a valid test to assess power propulsion in sprinters and to estimate swimming performance. The ratio W'T/W'TOT (0.40 ± 0.04) represents the fraction of total mechanical power that can be utilised in water (e.g., ηP) and was indeed the same as that estimated based on the “paddle wheel model”; this supports the use of this model to estimate ηP in swimming.  相似文献   
44.
Canadian independent artist-run centres provide an interesting case study of the potential role and relevance of non-profit institutions in the contemporary arts field. Predominantly established during the 1970s, they have been founded by artist collectives typically operating within urban contexts, with the aim of providing new opportunities to cope with the physical, economic and cultural constraints that generally impede the professional development of artists. A remarkable urban environment in which it is possible to find, and study, a large number of such organizations is the city of Montreal, in the Quebec Province of Canada, which constitutes an excellent reference to track the onset and the evolution of independent artist-run spaces, and to understand why, how and to what extent they are currently experiencing new pressures and challenges, both on the internal and external sides. This article offers an empirical study of these organizations with reference to their organizational, managerial and strategic vision, and to co-operative interaction and network building practices. It contributes to the field of research on cultural management through its study of the effects of management systems on the strategic action of independent visual arts organizations.  相似文献   
45.
Two experiments investigating sex differences in the open-field behavior of young chicks are reported. In the first experiment, ambulation latencies of 10-day-old male and female chicks in a novel environment were measured. Half of the chicks were kept in social isolation for 2 days prior to testing; the other half were socially reared until tested. Results showed that in socially reared chicks ambulation latencies were significantly higher in males than in females, whereas in isolation-reared chicks there were no significant sex differences. In the second experiment, latencies of ambulation were measured in socially reared 10-day-old chicks placed in a novel environment with or without a visible predator (i.e., a human being). Sex differences were evident in both conditions, with males showing higher ambulation latencies than females. It is argued that sex differences in open-field behavior of chicks may be due to a stronger motivation for social reinstatement in females, which reduces the usual antipredatory reactions of chicks placed in a novel environment.  相似文献   
46.
Acquisition of two-way avoidance by mice was slower with a light CS than with a buzzer CS, with punishment of intertrial responses than without punishment, and with a short CS-CS interval than with a long CS-CS interval (30 vs. 60 sec). Light-cued avoidance was little affected by shock level (.35–1.5 mA), whereas mice trained with the buzzer CS learned faster at 1.5 mA. Animals required to move away from light or toward light showed comparable rates of acquisition. Other CS, US, and apparatus variables (directionality of cue, maximal shock duration, and presence vs. absence of a central partition in the shuttlebox) interacted in a complex fashion with those already mentioned. This resulted in widely differing performances in what may superficially appear to be different versions of the same task. The differences in mouse and rat responses to some of the variables can contribute to an understanding of the interactions between organismic and test factors and the relative explanatory value of alternative avoidance models.  相似文献   
47.

Objectives

Childhood maltreatment occurs often among those with an eating disorder and is considered a nonspecific risk factor. However, the mechanisms by which childhood maltreatment may lead to an eating disorder are not well understood. The current study tests a model in which attachment insecurity is hypothesized to mediate the relationship between childhood maltreatment and eating disorder psychopathology.

Method

Treatment seeking adults with eating disorders (N = 308) completed questionnaires about childhood maltreatment, eating disorder psychopathology, and adult attachment.

Results

Structural equation models indicated that childhood trauma had a direct effect on eating disorder symptoms. Also, attachment anxiety and avoidance each equally mediated the childhood maltreatment to eating disorder psychopathology relationship.

Conclusions

Attachment insecurity, characterized by affect dysregulation and interpersonal sensitivities may help to explain why eating disorder symptoms may be one consequence of childhood maltreatment in a clinical sample. Clinicians treating primarily those with trauma might assess for disordered eating as a potential manifestation of the sequelae of trauma and attachment insecurity.  相似文献   
48.
The room-temperature photoluminescence spectra of various samples of Egyptian blue (CaCuSi4O10) are presented, discussed and compared with those of recently synthesized compounds corresponding to the ancient pigments Han blue (BaCuSi4O10) and Han purple (BaCuSi2O6). All the samples of Egyptian blue show identical spectra, in spite of their very different origin. The spectra of Han blue and Han purple are significantly different. Since the Cu2+ ion may be considered the only luminescent centre in the spectral range under investigation, the differences between the spectra of the various pigments are ascribed to a ligand-field change. This can be related to the larger size of the Ba2+ ion with respect to Ca2+. The use of PL spectra for the identification of these pigments in works of art is proposed.  相似文献   
49.
50.
At the obstetrical clinic of Modena University and a family center of the same municipality during the first six months of 1980 a questionnaire based on "Risks of Child Abuse" by Kempe, Gray and others was administered to 33 expectant mothers during the third trimester of pregnancy, a few days after delivery, and a month and one-half after childbirth, for the purpose of examining the mother-child relationship. Two principal groups of "risk factors" which may lead to child abuse and neglect appeared: mothers with preceding personal and social experiences, and cases of medical intervention (e.g., prematurity, caesarean). Use of a questionnaire that permitted early diagnosis made possible help in establishing a good mother-child relationship in the first months of life. Such help can be given by the hospital and public centers both before and after birth.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号