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   7824篇
  免费   481篇
  国内免费   868篇
林业   546篇
农学   498篇
基础科学   357篇
  719篇
综合类   4024篇
农作物   707篇
水产渔业   362篇
畜牧兽医   1028篇
园艺   617篇
植物保护   315篇
  2024年   48篇
  2023年   135篇
  2022年   372篇
  2021年   358篇
  2020年   355篇
  2019年   303篇
  2018年   227篇
  2017年   398篇
  2016年   260篇
  2015年   363篇
  2014年   445篇
  2013年   501篇
  2012年   690篇
  2011年   674篇
  2010年   667篇
  2009年   533篇
  2008年   570篇
  2007年   546篇
  2006年   464篇
  2005年   365篇
  2004年   241篇
  2003年   152篇
  2002年   136篇
  2001年   137篇
  2000年   150篇
  1999年   36篇
  1998年   7篇
  1997年   5篇
  1996年   1篇
  1995年   6篇
  1994年   6篇
  1993年   5篇
  1992年   3篇
  1991年   2篇
  1990年   2篇
  1989年   1篇
  1987年   3篇
  1986年   1篇
  1981年   2篇
  1962年   2篇
  1956年   1篇
排序方式: 共有9173条查询结果,搜索用时 15 毫秒
71.
河川基流分割法在山丘区地下水资源量评价中的运用   总被引:1,自引:0,他引:1  
山丘区河川基流分割方法很多,采用不同方法的分割成果不尽相同。在地下水资源评价中,根据云南省自然地理独特,气候复杂多样,降水量丰沛,洪水频繁,河川径流过程线普遍呈连续多峰型的特性,寻求一种既能满足水资源综合规划要求,又符合云南实际分割河川基流量的方法,是地下水资源评价中的重要内容。采用适宜水均衡法和直线斜割法的径流资料分割河川基流量,求出两种方法之间的换算系数,修正水均衡法的分割成果,一是达到了以直线斜割法统一分割河川基流量的目的;二是提高了山丘区地下水资源量评价的精度,为探索山丘区地下水资源量及时空分布规律提供技术支撑。  相似文献   
72.
协优336是江苏里下河地区农业科学研究所选育的杂交中籼稻新组合,2005年通过国家农作物品种审定委员会审定定名。2003—2005年,该组合在贵州、四川等地示范,表现杂种优势突出,高产稳产,来质较优,耐寒性强。本文介绍了该组合的高产栽培技术。  相似文献   
73.
对贵州山区目前在生产上正在使用的西山系列玉米杂交种12份进行了SSR分析。从60对引物中筛选到稳定性好、多态性丰富的8对引物作为核心引物。用这8对引物的指纹组合构建了贵州山区西山系列玉米杂交种的DNA指纹数据库。结果表明,利用SSR技术进行玉米杂交种真实性的鉴定是可行、有效的。  相似文献   
74.
Investment on construction projects has become an important factor in improving the development of economy in China.The non-price bottom bidding is a representation that the investment on projects is becoming standardized.During the years of trying out the non-price bottom bidding,the colluding in bidding or bidding below the cost has happened several times,which have damaged the benefits of owners.To solve theses problems,this paper firstly studies the reason of these problems-the failure in the normal relationship between principal and agent.Then,some measures have been presented as follows: building systematic and scientific system of qualification prejudication,judging behaviors of colluding in bidding and bidding below the cost with reason and providing a surety mechanism of the project.The authors hope that these measures are beneficial to non-price bottom bidding.  相似文献   
75.
The paper studies a drug deliversy system for protein and find the optimum preparation condition.Cross-linked alginate(Alg) microcapsule was used to prepare microcapsule for protein,using bovine serum album(BSA) as a model drug.Effect of different cations and content of protein on configuration,size and enveloped rate of microcapsule were investigated.It is shown that Ba-Alg microcapsule has steady configuration,homogeneous size and high-enveloped rate.Also electrophoresis of native BSA before microencapsulation and after microencapsulation is measured by(SDS-PAGE),it is found that no significant change is observed BSA integrity.Release of BSA from microcapsule in vitro presents sustained release in some extent,and initial burst effect is significantly obvious.Microenpsulation drug in alginate will be a wishful drug delivery system.  相似文献   
76.
77.
Some conclusions were drawn from two groups of in-site tests on concrete pile composite foundations. In the tests, it was found that the pressure under the rigid loading slab is different, in which the pressure under the center of the slab is the less and under the edge of the slab is the biggest. The pile-soil stress ratio is not a constant; it increases with the adding of the load. Most of the pile-soil ratio vary from 9 to 13 in these tests and the load that the piles share can be more than seventy percent of the whole load. It was proved that the bearing capacity of the concrete pile composite foundation is high with a little settlement, so it will be used more and more in the future.  相似文献   
78.
Condition assessment on power transformer is an important approach to improve reliability of transformer and provide proper decision-making for condition-based maintenance. For long, static assessment method used in the past has already not adapted to the development of modem electricity transmission and distribution technology. So based on the deficiency of fuzzy synthetic assessment method, matter-element synthetic assessment method is introduced. The method can evaluate transformer condition not only in quality but also in quantity. Because each index weight can be given fairly and fast through improved analytic hierarchy process, which need not carry on consistency chec accuracy of assessment can be improved. Examples analysis has proved that assessment method of power transformer condition based on matter-element theory is rational and effective.  相似文献   
79.
Engineering designed mode has entered a new stage because of the development of network. New calculating system based on network appeared. By analyzing the common B/S architecture, this paper brings forward an reformative architecture based on Web services and ASP. NET in order to build the new mode of engineering calculation. It can fully implement the sharing of the resources and provide the engineering designers a wonderful calculating environment, and the working eifficiency of designers can be enhanced.  相似文献   
80.
夏大豆齐黄29号配套栽培技术   总被引:1,自引:0,他引:1  
齐黄29号是由山东省农业科学院作物研究所以济3045作母本、潍8640作父本有性杂交,经系谱选育而成的早熟、高产、高油、抗病虫夏大豆新品种,2003年通过国家审定(审定编号:国审豆2003019)。  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