全文获取类型
收费全文 | 24922篇 |
免费 | 303篇 |
国内免费 | 16篇 |
专业分类
教育 | 17675篇 |
科学研究 | 2006篇 |
各国文化 | 283篇 |
体育 | 2445篇 |
综合类 | 9篇 |
文化理论 | 230篇 |
信息传播 | 2593篇 |
出版年
2021年 | 253篇 |
2020年 | 407篇 |
2019年 | 603篇 |
2018年 | 808篇 |
2017年 | 751篇 |
2016年 | 727篇 |
2015年 | 450篇 |
2014年 | 593篇 |
2013年 | 4566篇 |
2012年 | 536篇 |
2011年 | 579篇 |
2010年 | 442篇 |
2009年 | 472篇 |
2008年 | 515篇 |
2007年 | 486篇 |
2006年 | 445篇 |
2005年 | 388篇 |
2004年 | 420篇 |
2003年 | 324篇 |
2002年 | 346篇 |
2001年 | 470篇 |
2000年 | 524篇 |
1999年 | 445篇 |
1998年 | 265篇 |
1997年 | 261篇 |
1996年 | 316篇 |
1995年 | 256篇 |
1994年 | 263篇 |
1993年 | 223篇 |
1992年 | 362篇 |
1991年 | 376篇 |
1990年 | 346篇 |
1989年 | 371篇 |
1988年 | 344篇 |
1987年 | 333篇 |
1986年 | 329篇 |
1985年 | 377篇 |
1984年 | 307篇 |
1983年 | 310篇 |
1982年 | 248篇 |
1981年 | 249篇 |
1980年 | 264篇 |
1979年 | 353篇 |
1978年 | 263篇 |
1977年 | 241篇 |
1976年 | 200篇 |
1975年 | 182篇 |
1974年 | 182篇 |
1973年 | 176篇 |
1971年 | 175篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
31.
32.
33.
34.
35.
36.
37.
38.
Post-war growth of higher education has attracted the interest of national governments. They are properly concerned with higher education's contribution to economic success and equity, and the efficient and effective use of public funds. They can intervene by means of legislation (which is unwieldy), exhortation (which is ineffective), or funding incentives. Funding councils must operate within a social and political context which determines the balance between planning and the market, central and local direction, public and private funding. They have only four strategies to choose from: deficiency-, formula-, contract-, and core-funding. The first was nearly fatal; the last is the preferred option for the future.
There are two issues: the merging of the two funding councils (PCFC and UFC), and the ending of the binary system. The first could produce a welcome single guiding intelligence for UK higher education, and economies of scale. The second raises the question of the funding of fundamental research. The merging of PCFC and UFC and the reorganisation of research-funding is a two-headed nettle. It must be grasped soon. 相似文献
There are two issues: the merging of the two funding councils (PCFC and UFC), and the ending of the binary system. The first could produce a welcome single guiding intelligence for UK higher education, and economies of scale. The second raises the question of the funding of fundamental research. The merging of PCFC and UFC and the reorganisation of research-funding is a two-headed nettle. It must be grasped soon. 相似文献
39.
An investigation has been undertaken at St Andrew’s church, Walpole St Andrew, Norfolk, to establish the underlying causes of the observed stone decay to the upper parts of the six stone piers. The stone decay was first recorded in the early 1930s. The salt-contaminated masonry within the church has been shown to undergo severe salt decay during the summer, with little damage occurring over the winter months. The south aisle piers have been shown to decay 2.5 times faster than the north aisle piers. Although crystallization–hydration cycles have been identified, the rate of decay is at its greatest when the cycling is relatively infrequent. This was not the expected trend. Furthermore, it has been shown that during extended periods where the ambient relative humidity is less than 75%, the rate of decay reaches a maximum. It is the length of this ‘drying’ period that apparently has the greatest influence on the rate of decay and could explain the significant difference in the rate of decay between the south and north aisle piers. The results have serious implications for passive conservation, where it is often recommended to lower the ambient relative humidity to well below the equilibrium relative humidity of the salt contaminant, to avoid crystallization–hydration cycles. Since, at the time of building, the church was situated on the coast, it is possible that the sodium chloride contamination occurred during the building process (1440–1520), particularly since the area was prone to sea-flooding at this time. Alternatively, the salt could have been applied as a treatment during the general restoration of 1897. Whatever the source of the salt, it seems likely that the ambient environment was changed by the insertion of a sealed floor in 1897, which could account for the onset of the salt decay. 相似文献
40.