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   732篇
  免费   34篇
  2024年   2篇
  2023年   12篇
  2021年   2篇
  2020年   20篇
  2019年   23篇
  2018年   39篇
  2017年   65篇
  2016年   35篇
  2015年   26篇
  2014年   40篇
  2013年   193篇
  2012年   33篇
  2011年   19篇
  2010年   20篇
  2009年   34篇
  2008年   19篇
  2007年   16篇
  2006年   9篇
  2005年   12篇
  2004年   11篇
  2003年   11篇
  2002年   12篇
  2001年   6篇
  2000年   8篇
  1999年   10篇
  1998年   10篇
  1997年   3篇
  1996年   4篇
  1995年   3篇
  1994年   3篇
  1993年   3篇
  1992年   3篇
  1991年   5篇
  1990年   2篇
  1989年   3篇
  1988年   3篇
  1987年   4篇
  1985年   2篇
  1984年   4篇
  1982年   7篇
  1981年   4篇
  1980年   2篇
  1977年   2篇
  1976年   3篇
  1974年   3篇
  1973年   2篇
  1972年   2篇
  1971年   3篇
  1968年   1篇
  1966年   1篇
排序方式: 共有766条查询结果,搜索用时 15 毫秒
31.
This paper examines the role of accelerator programmes in promoting transnational entrepreneurship. Designed to assist the growth of start-ups by providing seed finance and structured entrepreneurship support, these programmes are now a prominent feature in many entrepreneurial ecosystems around the world. Drawing on in-depth qualitative evidence focused on one particular programme, the paper shows accelerators play an important intermediary or ‘brokerage mechanism’ providing start-ups with enhanced relational connections and networks. Transnational entrepreneurs attracted to these programmes are highly focused on exploiting these networks whilst maintaining multiple levels of embeddedness in various contexts to maximize the opportunities afforded by accelerators. While many governments are attempting to replicate accelerators programmes within the public sector, the paper concludes that such attempts may prove problematic within weaker entrepreneurial ecosystems.  相似文献   
32.
This study had two purposes. First, it empirically examined the relationship between citizens' participation in administrative policymaking phases and their perception of government transparency. Second, it investigated how citizens' use of both offline and online participation channels and their involvement in different phases of policymaking (i.e., agenda setting, implementation, and evaluation) were related to their assessment of transparency in government. A 2009 survey of residents of Seoul, South Korea, was used to test the study hypotheses. Using two‐stage least squares estimate techniques, the study found that citizens involved in any citizen participation programs are more likely than those not involved to positively assess transparency in government. With regard to the relationship between participation channels and transparency, citizens who used offline participation channels were more likely than nonusers to perceive enhanced transparency in local government. However, their use of online participation channels had limited effect on perceptions of transparency. Finally, participation in two phases of the policy process, agenda setting and evaluation, positively affected citizens' assessment of transparency in government.  相似文献   
33.
34.
Between 1900 and 1970, American archaeologists perceived themselves as second-class anthropologists because the archaeological record suggested little not already known ethnographically, archaeology served anthropology by testing ethnologically derived models of cultural evolution, the archaeological record was ethnologically incomplete as a result of poor preservation, and archaeologists used but did not write anthropological theory. Ethnologists of the period agreed with these points and regularly reminded archaeologists of their limited role in anthropology. A few archaeologists claimed in the 1950s that archaeology could contribute to anthropological theory but they were ignored. The claim was reiterated by new archaeologists of the 1960s, and by the 1970s worries about the poor preservation of the archaeological record had softened. However, most archaeologists after 1970 (and before 1990) used anthropological theory and did not write new theory on the basis of archaeological data. The root cause of American archaeology’s ninety-year absence from anthropology’s high table of theory seems to be the discipline-wide retention of the ninety-year old belief that archaeology is prehistoric ethnology and the (unnecessary and constraining) corollary that archaeologists must use anthropological theory to explain the archaeological record.  相似文献   
35.
36.
Many versions of the history of Americanist archaeology suggest there was a stratigraphic revolution during the second decade of the twentieth century—the implication being that prior to about 1915 most archaeologists did not excavate stratigraphically. However, articles and reports published during the late nineteenth century and first decade of the twentieth century indicate clearly that many Americanists in fact did excavate stratigraphically. What they did not do was attempt to measure the passage of time and hence culture change. The real revolution in Americanist archaeology comprised an analytical shift from studying synchronic variation to tracking changes in frequencies of artifact types or styles—a shift pioneered by A. V. Kidder, A. L. Kroeber, Nels C. Nelson, and Leslie Spier. The temporal implications of the analytical techniques they developed—frequency seriation and percentage stratigraphy—were initially confirmed by stratigraphic excavation. Within a few decades, however, most archaeologists had begun using stratigraphic excavation as a creational strategy—that is, as a strategy aimed at recovering superposed sets of artifacts that were viewed as representing occupations and distinct cultures. The myth that there was a stratigraphic revolution was initiated in the writings of the innovators of frequency seriation and percentage stratigraphy.  相似文献   
37.
38.
Swimming is a popular form of recreation and exercise in the UK and US. Swimming can take place outdoors but, particularly in the UK, largely takes place in designated indoor pools. Existing research tends to focus on ‘public’ or ‘municipal’ pools leaving broader spatial geographies of swimming pool provision under explored. In response to concern about swimming pool closures, this paper draws from extensive archival research into all swimming pools in the City of Glasgow, Scotland, since the first opened in 1804. Formal and informal programmes of pool building and closure were revealed. Rather than decreasing, public provision has remained constant for the last 100?years but become progressively more spread out in relation to the city’s changing size. Broadening exploration beyond the ‘public’ category exposed a vast drop in school pool numbers around the year 2000 due to a Private Finance Initiative project that consolidated the secondary school estate and outsourced school building management. The lessons: researching all types of swimming pool through time greatly enriches understandings of the changing meaning and extent of public service provision.  相似文献   
39.
Lee, D.-C. February 2017. Radialimbricatus, a new ichnogenus from the lacustrine sandstone facies of the Lower Cretaceous Jinju Formation, South Korea. Alcheringa XX, XXX–XXX.

The trace fossil Radialimbricatus igen. nov. with type species of R. bitoensis isp. nov. occurs in river-mouth-bar sandstone beds of a lacustrine sequence of the Lower Cretaceous Jinju Formation in South Korea. Radialimbricatus is a horseshoe-shaped or elliptical, convex hyporelief structure characterized by imbrication of traces with radial ridges and a median furrow. These features differentiate Radialimbricatus from arthropod ichnofossils such as Rusophycus and Cruziana, possibly cnidarian ichnofossils such as Astropolichnus and vermiform organism ichnofossils such as Oldhamia. Cross-sectional features of R. bitoensis, including upward mud protrusions at lateral margins, demonstrate that R. bitoensis can be formed as an open epigenic furrow at the water/mud interface or an endogenic burrow along the sand/mud interface at the same time. Analysis of discrete and imbricating horseshoe-shaped traces indicates that the tracemaker maintained an obligate inclined posture even when forming trails. The radial ridges and pit along the median furrow are interpreted to reflect feeding behaviour, and the imbrication to result from unidirectional and more or less regular movements to next feeding sites. The tracemaker is thought to have been an organism with an elliptical body outline, radially arranged body parts at the base of or around the body (probably for collecting and transporting foods and moving to feeding sites) and a mouth near the centre of the body, which is consistent with body plan features of arthropods, cnidarians and annelids.

Dong-Chan Lee [], Department of Earth Sciences Education, Chungbuk National University, Cheongju, 28644, South Korea.  相似文献   

40.
Chinese popular music, inspired by pre-war Shanghai music known as ‘shidai qu’ (时代曲) (songs of the era) and evolving to include Canto pop and Taiwanese Mandarin songs, has always been popular among the Chinese in Malaysia. This music is featured on radio, television, karaoke, and performed by orchestras such as the Dama Chinese Orchestra (大马) to enthusiastic reception. The songs have a broad appeal that transcends time, generation, and place. Of significance is the observation that the music has become a cultural marker and musical heritage for Chinese in Malaysia and in the region. The paper looks at factors behind this development.  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