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   2399篇
  免费   107篇
  2024年   4篇
  2023年   41篇
  2022年   29篇
  2021年   51篇
  2020年   109篇
  2019年   117篇
  2018年   105篇
  2017年   119篇
  2016年   114篇
  2015年   68篇
  2014年   72篇
  2013年   383篇
  2012年   164篇
  2011年   110篇
  2010年   122篇
  2009年   106篇
  2008年   101篇
  2007年   90篇
  2006年   80篇
  2005年   55篇
  2004年   56篇
  2003年   60篇
  2002年   39篇
  2001年   59篇
  2000年   97篇
  1999年   17篇
  1998年   7篇
  1997年   16篇
  1996年   9篇
  1995年   15篇
  1994年   10篇
  1993年   6篇
  1992年   14篇
  1991年   8篇
  1990年   1篇
  1989年   6篇
  1988年   6篇
  1987年   8篇
  1986年   5篇
  1985年   6篇
  1984年   11篇
  1983年   1篇
  1982年   4篇
  1981年   1篇
  1980年   2篇
  1979年   1篇
  1978年   1篇
排序方式: 共有2506条查询结果,搜索用时 203 毫秒
1.
马科斯独裁下的菲律宾土地改革(1972—1986)   总被引:1,自引:0,他引:1  
菲律宾农村土地分配的不公正状况在马科斯统治初期依然严峻,土地问题的急剧升级加剧了政体的演变,但军管法下的土改并没有使农民的生活状况得到明显改善。马科斯政府虽然与“旧寡头政治执政者们”逐步脱离,但和军人集团、政策制定者及商业权贵结合,实行“亲朋资本主义”政治,继续忽视农民的利益,农村基层组织也为地主势力所把持。制度创新的滞后严重阻碍了菲律宾农村土地改革和农村发展。  相似文献   
2.
This article presents a survey of Neolithic economy, land use, trade, natural environment, and usage of plant and animal resources in central Europe, 5415–2240 B.C. (4500–1800 bc). Early, Middle A and B and Late Neolithic materials are summarized and compared. The earliest farmers expanded from southern Hungary and adjacent areas into central Europe over a relatively short time period, 100–200 years. They occupied areas only with good soils; thus probably hunters and gatherers continued to exist in many regions of central Europe. There is an increase in population and more upland areas are exploited for farming during the Middle Neolithic A and B periods. By the Middle Neolithic B period, low-level hierarchical or ranked societies appear in some regions of central Europe. The Late Neolithic may represent a modification of the mixed farming strategy observed during the earlier periods. Perhaps the herding of domestic animals became more important.  相似文献   
3.
4.
The article shows that the elite, nationalistic and imperial mentality of German medicine in the second half of the nineteenth century was closely connected to its aim to be understodd as a natural science. With this in view leading representatives of German medicine propagated a scientific approach to man and nature instead of the traditional values of humanistic education (“Bildung”). One of the most important consequences of the new scientific ideal in medicine — integration in governmental planning, the change in professionel status of doctors, the increasing tendeny to recognize biologistic ideologies — was the loss of the medical ideal of the ars medica, a subject which has not received sufficient thematic attention. This theme is explored in the third part of the article.  相似文献   
5.
6.
The foundation and administration of European Zoological gardens in the 19th century is analized. It is significant of such new institutions, that they are founded in the large cities, and that most of the founders looked at the great models in Paris and London, which are described first. Further it is shown that the change from princely menageries to public Zoological Gardens is caused both by common interests in people's education and pleasure and by scientific aims which leaded to choose the name Zoological “garden” in analogy to botanical gardens. It seems to be characteristic of such public institutions created by citizens in the 19th century that they are mostly supported by commercial or scientific local societies. This is exemplified by describing the administration of the Zoological gardens of Berlin (1841), Frankfurt (1856) and Hamburg (1863), which initiated also research for acclimatization of wild animals.  相似文献   
7.
The various scholarly and scientific endeavours — comprising both arts and sciences —, which British statesmen persued in their leisure time, transcend the mere biographical aspect. In the light of the slow, yet steady professionalisation of educational and political institutions, many of them modernised or newly created in order to achieve what came to be called “National Efficiency”, the literary and scientific pastimes of men, like Gladstone, Morley, Salisbury, Balfour or Haldane, seemed soon to become somewhat obsolete. Yet, it is argued, that the often professedly amateurish activities did not merely display the traditional hobby attitude to the sciences, so characteristic of the wealthy aristocrat, but in some cases revealed a good understanding of the scientific and educational needs of society, leading up to their active advancement. The British amateurs, it would seem, were pleading for providing a balanced higher education and training, rather than going for the technical excellence of the political rival Imperial Germany, which dazzled and, at the same time, intimidated some of them.  相似文献   
8.
The Permanent ‘Becoming’ of the Cosmos: On Experiencing the Time Dimension of Astronomical Entities in the 18th Century. - This paper deals with two of the initial stages through which the dimension of time, in the sense of an irreversible development, found its way into astronomical-cosmological thinking. The one resulted from the first consequental application of Newtonian principles and laws to cosmic entities outside of our solar system found in the General Natural History or Theory of the Heavens of Immanuel Kant (1755): Endeavoring to explain through natural causes first the peculiarities of the solar system, no longer naturally explainable through the celestial mechanics of Isaac Newton (such as the common orbital plane and rotational direction of all the members of the solar system and the distribution of the masses) - which, however, had been deducible in Johannes Keplers Weltharmonik -, and endeavoring secondly to explain above all the beginning of the inertial movement of all discrete heavenly bodies - which, however, could have been derived from René Descartes's vortex theory - without using arbitrary acts of God as Newton had done, Kant had to introduce an initial state in which matter in the form of atoms was equally and almost homogeneously distributed over the whole space (similar to the permanent state in Descartes's theory). Thereupon, according to Kant, the initial movements of the slowly growing masses resulted from the effect of gravitational forces. The parameters within the solar system which had to be explained, could then be easily deduced from the process of mass concentration at different points and from the resulting vortex movements. - The other initial stage is found in the classification of ‘nebulae’ by William Herschel who introduced the historical time factor, in the above-mentioned sense, as a principle of order in addition to the outward shape, which had become common for all the different elements in natural history during the second half of the 18th century. Thereupon the different shapes of the nebulae could be interpreted as stages of development from the primordial nebular state to multiple or single stars. (Herschel had not yet considered them to be accumulations of stars for lack of a suitable telescope.) Both initial stages, which arose out of the thinking of the second half of the 18th century, were still premature for astronomy and cosmology; they have only been taken up again since the end of the 19th century as a result of the emergence of astrophysics, which provided the empirical data for the earlier speculations and conclusions from analogy.  相似文献   
9.
From the “nature of things” to the history of language: The transition from the study of language to historico-comparative linguistics. This brief essay deals with a somewhat problematic phase in the history of linguistics and tries to investigate the process by which language could be understood as a historical phenomenon with a history of its own. This new understanding of language turned out to be the starting condition for a new and very prolific way in the study of language. The conjecture is that this is due to certain alterations in the semantic field of some important notions relating to language and its study. The process of alteration began by the end of the eighteenth century with conceptual achievements which could adequately be termed as temporalization of aspects of language and the notions related to these aspects. In connection with the so called discovery of the Sanskrit language and the gradual reception of its grammatical structure, looking upon language as an organic entity with autonomous and internal structures of developpement became possible after the German romantic language philosophy had developped a strictly abstract concept of language as a notion of form. This essentially metaphorical mode of speaking nevertheless inaugurated that languages were concieved of as having their own history totally independent of their speakers. With language as an autonomous object the study of language rapidly became the science of language.  相似文献   
10.
Naturbildung, written by B. H. Blasche in 1815, seems a typical philanthropic study about science education private organized. But it also demonstrates romantic philosophy influences, which led at least from describing natural history to biology. There was no success in Blasche's reformatory efforts: first reason because the idea of private education-institution was out of discussion. Second reason was, on the way to stateorganized schoolsystem in Germany classic philology dominated and repressed deeply science education.  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