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   664篇
  免费   8篇
  国内免费   2篇
教育   393篇
科学研究   38篇
各国文化   38篇
体育   59篇
综合类   38篇
信息传播   108篇
  2023年   3篇
  2022年   12篇
  2021年   33篇
  2020年   7篇
  2019年   8篇
  2018年   11篇
  2017年   19篇
  2016年   10篇
  2015年   50篇
  2014年   14篇
  2013年   28篇
  2012年   11篇
  2011年   3篇
  2010年   9篇
  2009年   18篇
  2008年   37篇
  2007年   25篇
  2006年   20篇
  2005年   22篇
  2004年   27篇
  2003年   43篇
  2002年   54篇
  2001年   37篇
  2000年   93篇
  1999年   25篇
  1998年   16篇
  1997年   14篇
  1996年   11篇
  1995年   9篇
  1994年   2篇
  1993年   1篇
  1992年   1篇
  1984年   1篇
排序方式: 共有674条查询结果,搜索用时 15 毫秒
31.
The Imam-caliph al-Mu‘izz al-Dīn Allāh undertook a series of monetary changes which were to have a monumental impact on all future Fā?imid coinage, would lead to many imitations even after the dynasty had fallen, and create an easily identifiable pattern that attracted medieval merchants and modern collectors. The fact that al-Mu‘izz's coinage went through three stages with slight variations in the wording and layout indicates that he was determined to create a new model for Fā?imid coinage which would distinguish it from the Aghlabid and ‘Abbāsid coinage that preceded and competed with it. In contrast, Sijilmasa coinage was so conservative in layout due to its role in the African trade.  相似文献   
32.
During soccer matches, performance decrements have been reported that relate to both physical abilities and technical skills. To investigate the effects of low-frequency electrical stimulation LFES (VeinoplusSport®, Ad Rem Technology, France) administered during half-time recovery on performance alterations during the second half. Twenty-two highly trained young players undertook a soccer-match simulation (SAFT90). During half-time, they were randomly assigned to LFES group or Placebo group. Each half was split into 3 bouts of 12 minutes. Following each bout, maximal strike speed (MSS), sprint test (ST), maximal sprint accelerations (MA) and metabolic power (MP) were determined in both groups. Arterial (AF) and venous flows (VF) were measured at rest and at the end of half-time. LEFS group exhibited beneficial effects on performance compared to the Placebo group with a likely effect for MSS, ST, MA, and a possible effect for MP. AF and VF increased statistically more in LEFS group compared to Placebo group. The use of specific calf-pump LFES during half-time of a youth simulated soccer match attenuated the decrease in performance during the second half compared to Placebo group. This effect is most marked at the beginning of the second half with regards to explosive parameters.  相似文献   
33.
This article examines the presentation of Muslim rulers from the early crusading period, 490–540/1097–1146 in six of the main chronicles written during the first half of the seventh/thirteenth century. It discusses the themes, ideas and topoi in each, demonstrating that the historians appear to have been divided into two ‘camps’ over their presentation of these rulers, based on their personal views of the rulers of their time. The article also examines why this division may have occurred, and considers its ramifications for modern scholarship of Arabic historiography, Islamic history and the history of the Crusades, in both the sixth/twelfth and seventh/thirteenth centuries.  相似文献   
34.
The purpose of the present study is to analyse the role played by an important female figure in early Shī?ite history. The person in question is Fi[ddot][ddot]a l-Nūbiyya, the servant-girl of Fā ?ima, the Prophet's daughter. After a long period of neglect by scholars, who have focused on what to their mind were figures of greater import, we shall here attempt to describe the role played by Fi[ddot][ddot]a in early Shī?ite history by way of analysing her biography and her close relations with Fā ?ima and members of the latter's family (?Alī, [Hdot]asan and [Hdot]usayn). We shall further describe what has been reported of Fi[ddot][ddot]a's personality, her family, her admiration for the Prophet's family, Qur?ānic verses which supposedly mention her, and the great respect in which she was held by Fā ?ima's family.  相似文献   
35.
第13届世界男子篮球锦标赛技术统计与分析   总被引:25,自引:5,他引:20  
对第 1 3届世界男子篮球锦标赛的观察和对 1 6支劲旅的各项技术统计与分析 ,结果显示 :当前世界男子篮球运动依然是以欧美为代表 ,其特点是强对抗 ,进攻以高、快、灵、准相结合 ;防守积极、凶狠、压迫。旨为提高我国男子篮球运动水平提供理论依据  相似文献   
36.
篮球中锋身体对抗能力的比较分析   总被引:5,自引:0,他引:5  
以比较法对篮球中锦身体形态、身体素质、攻防技术及其心理等多角度分析其对抗能力 ,认为中锋在良好身体形态的基础上 ,必须具备超常的身体素质、娴熟的攻防技术和良好的心理素质 ,善于巧对抗 ,才能激烈比赛中处于不败之地  相似文献   
37.
    
Zusammenfassung. Traditionelle und deduktive Informationssysteme werden heute immer noch isoliert voneinander modelliert und implementiert. Für die meisten Benutzer sind jedoch Systeme wichtig, die ihren allt?glichen Informationsbedarf decken und darüber hinaus deduktive F?higkeiten besitzen. Der bekannte Entity-Relationship-Ansatz zur konzeptionellen Datenmodellierung wird in dieser Arbeit so erweitert, da? damit solche integrierten Systeme modelliert werden k?nnen. Au?erdem wird eine Klassifizierung ableitbarer Daten eingeführt, die dem Analytiker Hilfestellung bei der Frage gibt, welche ableitbaren Daten bei der Modellierung berücksichtigt werden sollen und welche nicht. Eingegangen am 2. November 1994 / Angenommen am 30. M?rz 1995  相似文献   
38.
采用影片解析与生物力学分析法,揭示了王军霞、曲云霞3000米跑的分段时间与速度节奏、步长与步频的变化规律、下肢支撑与摆动等主要技术特征。  相似文献   
39.
高校体育课准备活动开展健身操教学的实验研究   总被引:5,自引:0,他引:5  
把大众健身操引入准备活动的实验研究表明:健身操练习法能活跃课堂气氛,培养学生能力,发展其个性,提高身体素质,树立终身体育的思想,是一种可行的准备活动练习法。  相似文献   
40.
Zusammenfassung.   Dieser Beitrag enth?lt die wesentlichen konzeptionellen überlegungen zur Entwicklung eines flexiblen Workflow-Management-Systems. Ausgehend von einer Diskussion m?glicher Modellierungsalternativen wird unter Verwendung objektorientierter Modellierungstechniken ein Workflow-Meta-Schema entwickelt, das die relevanten Entit?ten klassifiziert und ihre Beziehungen abbildet. Anhand eines Beispiels werden die getroffenen Entwurfentscheidungen ausführlich begründet. Schlie?lich werden Zust?nde und Zustandsüberg?nge von Workflow-Instanzen beschrieben, und es wird diskutiert, wie dynamische Ver?nderungen von Workflows zur Laufzeit durchgeführt werden k?nnen, um laufende Workflows dynamisch an ver?nderte Umweltbedingungen anzupassen. Eingegangen am 20. Dezember 1997 / Angenommen am 24. Juli 1998  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