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   155214篇
  免费   8467篇
  国内免费   14232篇
林业   10622篇
农学   8068篇
基础科学   7492篇
  15350篇
综合类   75901篇
农作物   10814篇
水产渔业   6553篇
畜牧兽医   23976篇
园艺   12026篇
植物保护   7111篇
  2024年   1320篇
  2023年   3214篇
  2022年   7390篇
  2021年   7224篇
  2020年   6693篇
  2019年   6529篇
  2018年   4739篇
  2017年   7398篇
  2016年   4893篇
  2015年   7429篇
  2014年   7934篇
  2013年   9412篇
  2012年   13059篇
  2011年   13626篇
  2010年   13062篇
  2009年   11658篇
  2008年   11287篇
  2007年   10452篇
  2006年   8589篇
  2005年   6661篇
  2004年   4095篇
  2003年   2551篇
  2002年   2675篇
  2001年   2485篇
  2000年   2205篇
  1999年   789篇
  1998年   65篇
  1997年   48篇
  1996年   31篇
  1995年   44篇
  1994年   41篇
  1993年   27篇
  1992年   48篇
  1991年   15篇
  1990年   11篇
  1989年   12篇
  1987年   18篇
  1986年   20篇
  1981年   23篇
  1966年   4篇
  1965年   5篇
  1964年   2篇
  1963年   3篇
  1962年   30篇
  1959年   2篇
  1958年   2篇
  1957年   3篇
  1956年   49篇
  1955年   32篇
  1953年   3篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
This paper is a part of the research on the lighting techniques of the traditional Chinese buildings in Summer Palace,Beijing,which is a sub-project of the Municipal Research Project on the Correlative Techniques for Beijing's Sustainable Development(Y0604017040391).The work,which the authors took part in,on the most representative Chinese traditional buildings in Summer Palace,is taken as a case study on lighting design and lab simulated experiments and checked by practical result,illustrating a working frame for other similar lighting design works.  相似文献   
992.
993.
994.
Some additional effects of stitching on the in-plane mechanical properties of composite laminate is introduced while it was used to improve the interlaminar of plane mechanical properties of the composite laminate. The paper investigates the effect of stitching on in-plane tensile strength of composite laminates. The results show that the effect of stitching is dependent on the stitching parameters. The in-plane tensile strength of laminates is degraded with the decreasing of stitching space and step and increasing diameter of stitching thread. It is found that the initial damage of laminate increased with increasing of stitching parameters such as stitching density. This causes the decrease in the in-plane strength of composite laminate.  相似文献   
995.
In order to realize elastic-plastic analysis in geotechnical FEA, in this paper, firstly, the method how to realize elastic-plastic analysis in Super-Sap is discussed. Then, this paper stresses to introduce the principle and the steps used to achieve the accomplishment of elastic-plastic analysis in Super-Sap. Finally, an engineering practice is given to prove that the geotechnical FEA elastic-plastic analysis and visualized post-processing can come true by it rapidly.  相似文献   
996.
In this paper,notions on appropriate technology for the Steel Construction Congregated Apartments are proposed in order to deal with the technical impediment that arises from applying steel structural techniques to the congregated apartments.The appropriate technology for the steel construction congregated apartments is defined as systematic technologies that are in harmony with the status quo of Chinese productive force level,social culture and building technology,and as the strategies of choosing or balancing technology according to sustainable development principle.The principal design and constructing strategies of appropriate technology are as follows:(1) organization of residential space combined with steel construction techniques,(2) suitable structural system,(3) a new idea of fire resistance,and(4) kit building technique etc.A technological concept analysis about an ideal model of a steel construction system congregated apartment combined with the appropriate technology is also presented.  相似文献   
997.
Philosophy of science led by Popper is one of the most important contemporary scientific and philosophic theories.In addition to the science,the philosophy of science impacted contemporary social science mostly,of which the false-feasibility,circumstantial logic,anti-historical determinism and anti-scientism influenced the orientation of contemporary architecture.Just with these factors of philosophy of science,this thesis reanalyzed and reviewed Chinese contemporary architectural forms,especially the tradition inheritance.  相似文献   
998.
In this paper the working principle and performance character of both the manual and automatic Vicat apparatuses in existence are compared and analyzed,and their existing weakness and the urgent problem to be solved are pointed out.On this basis,adopting the technology of mechatronics and modern sensors,a new sort of full automatic Vicat apparatus that can fully satisfy the national standard in testing the setting time of the cement has been developed.This apparatus can be operated expediently with high precision,the test results are to be analyzed and computed automatically.This paper presents the working principle,performance character,key technology and prospect of application for the full automatic Vicat apparatus.  相似文献   
999.
In wireless sensor networks that consist of a large number of low-power sensors.Because the sensor's energy is limited,one of the main design is to obtain long system lifetime.The authors firstly analyse LEACH and LEACH-C clustering routing for wireless sensor networks.Aimming at their shortcoming,they present a new routing LEACH-NEW.This routing uses multi ho Pinstead of one hop.At last,they use NS2 to simulate them.Simulation show results that new routing exhibits noticeably longer system lifetime than rouing LEACH and LEACH-C.  相似文献   
1000.
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