全文获取类型
收费全文 | 309篇 |
免费 | 6篇 |
国内免费 | 8篇 |
专业分类
教育 | 197篇 |
科学研究 | 79篇 |
各国文化 | 9篇 |
体育 | 5篇 |
综合类 | 13篇 |
文化理论 | 1篇 |
信息传播 | 19篇 |
出版年
2022年 | 6篇 |
2021年 | 6篇 |
2020年 | 3篇 |
2018年 | 4篇 |
2017年 | 3篇 |
2016年 | 7篇 |
2015年 | 15篇 |
2014年 | 25篇 |
2013年 | 19篇 |
2012年 | 36篇 |
2011年 | 46篇 |
2010年 | 21篇 |
2009年 | 22篇 |
2008年 | 21篇 |
2007年 | 27篇 |
2006年 | 9篇 |
2005年 | 10篇 |
2004年 | 13篇 |
2003年 | 11篇 |
2002年 | 6篇 |
2001年 | 3篇 |
2000年 | 4篇 |
1997年 | 1篇 |
1996年 | 2篇 |
1993年 | 1篇 |
1991年 | 2篇 |
排序方式: 共有323条查询结果,搜索用时 15 毫秒
21.
本文为方便中国用户在WINDOWS系统下做文字处理工作,用UCDOS 5.0系统中丰富的汉字词汇去充实WINDOWS的码表文件,提供了实用的转换程序。 相似文献
22.
高校图书馆无线局域网的建设 总被引:17,自引:1,他引:16
全成干 《现代图书情报技术》2003,(4):74-75
以厦门大学图书馆为例,结合高校图书馆特点、本馆建设经验和作者对无线局域网的认识,阐述以IEEE802.11b规范建立符合高校图书馆服务要求的无线局域网应注意的关键问题。 相似文献
23.
Paulo Bastos Tigre 《The Information Society》2003,19(1):33-43
E-commerce is growing rapidly in Brazil, led by information-intensive and transaction-intensive sectors such as finance, manufacturing, and retail/wholesale. However, Brazil's highly uneven income distribution is a major barrier for B2C diffusion. Government policies have emphasized promotional or enabling initiatives such as e-procurement, tax filings, and providing Internet access to social institutions. E-commerce legislation is just now being developed, and decisions on taxation are being negotiated in the context of international agreements. E-commerce raises issues for Brazil in terms of its relationship to the global economy. Although most online purchases involve imported goods, e-commerce also offers opportunities to participate in international value chains. 相似文献
24.
通过对32例健康的中国白兔红细胞上C_(3b)受体和免疫复合物的检测,其红细胞上C_(3b)受体的花环率为8.86±1.42;免疫复合物的花环率为6.84±1.03.这一结果与恒河猴等动物相比,皆有一定的特异性,也充分表明中国白兔的红细胞在清除体内危害性极大的免疫复合物上起着重要的作用。 相似文献
25.
从馆藏数字资源的在线使用情况、用户使用比例及高层次用户群获取数字信息的渠道3个层面,对高校不同层次用户群数字信息获取行为及其与二八法则、长尾法则的契合点进行分析的结果表明:图书馆在引导用户优化数字信息获取行为时应重视20%学科专家的信息影响力,以此带动80%用户信息素养的整体提高;应引导用户有效利用长尾尾部的数字信息获取渠道;应组织、揭示数字信息,引导用户需求向长尾尾部移动。 相似文献
26.
Although age is not supposed to be a criterion for the award of the Nobel Prize, it is commonly believed that it does play a role. Indeed, econometric evidence in this paper also suggests such a role. However, the paper finds that, if there is a preference for older Nobel candidates, this is introduced during the nomination process. The paper actually finds that the Nobel Committee does not favor older nominees and that, if anything, it seems to partially offset the age premium introduced by the nominators. 相似文献
27.
This paper addresses the role that scientific status plays in initial public offerings of technology focused firms. The paper builds on the literature of the sociology of science as well as the work of Spence (1974) and Podolny (1993) and argues that the presence of a Nobel laureate affiliated with a firm making an IPO provides a signal of firm quality to potential investors. Moreover, and building on the work of Podolny and Scott Morton (1999) and Stuart et al. (1999) we hypothesize that the importance of status diminishes as other measures of firm quality become available. We test our hypothesis for two periods of initial public offerings in biotechnology. We document that there is a clear difference in “maturity” of the firms across the two windows on a number of metrics. Consistent with our hypothesis that Nobel laureates play an important role as a non-financial signal of firm quality, we find that first-window firms with a Nobel laureate affiliate realize greater IPO proceeds in the amount of $24 million. In the second window the amount of money raised is not significantly different between Nobel and non-Nobel firms. This finding is consistent with the signaling literature that argues that the importance of a signal is inversely related to the availability of cogent information on firm quality. Consistent with this view, we also find a change between the two windows in the importance of other non-financial metrics used to convey value. Our research is one of the first to examine the dynamic nature of signals. Because we are unable to distinguish the extent to which the reduction in uncertainty at the firm level is correlated with the reduction of uncertainty at the industry level, the question remains as to the extent to which the diminished importance of signals in our second period is due to a change in market uncertainty versus a change in firm uncertainty. 相似文献
28.
29.
以图情领域的四种优秀期刊为数据来源,借助散点图与曲线拟合的方法,在论文、作者、机构三个层面上归纳了引文网络中入度分布的三个特征。其一,三个层面的入度分布均呈现幂律分布,优先连接机制起明显作用;其二,在机构的入度分布出现了单峰,即均匀连接机制存在于引文网络中,且削弱了入度分布近似直线的程度;其三,二八律与幂律分布存在紧密联系。论文最后对这些特征的形成原因进行了分析。 相似文献
30.
目前,很多高校专职辅导员都是刚从高校毕业的"80后",他们能否胜任"90后"大学生辅导员的工作是值得关注的问题。本文将从"80后"辅导员本身需要注意的问题和班级建设层面提出几点思考和建议,希望能对"80后"高校辅导员有一定借鉴作用。 相似文献