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   11618篇
  免费   46篇
  国内免费   71篇
系统科学   61篇
丛书文集   29篇
教育与普及   21篇
理论与方法论   32篇
现状及发展   5428篇
研究方法   586篇
综合类   5449篇
自然研究   129篇
  2012年   205篇
  2011年   301篇
  2010年   76篇
  2009年   74篇
  2008年   201篇
  2007年   242篇
  2006年   247篇
  2005年   233篇
  2004年   202篇
  2003年   195篇
  2002年   248篇
  2001年   435篇
  2000年   426篇
  1999年   288篇
  1992年   236篇
  1991年   194篇
  1990年   215篇
  1989年   191篇
  1988年   201篇
  1987年   219篇
  1986年   190篇
  1985年   252篇
  1984年   227篇
  1983年   171篇
  1982年   176篇
  1981年   180篇
  1980年   170篇
  1979年   403篇
  1978年   340篇
  1977年   250篇
  1976年   290篇
  1975年   259篇
  1974年   272篇
  1973年   224篇
  1972年   244篇
  1971年   308篇
  1970年   374篇
  1969年   254篇
  1968年   307篇
  1967年   292篇
  1966年   249篇
  1965年   178篇
  1964年   99篇
  1959年   88篇
  1958年   162篇
  1957年   100篇
  1956年   91篇
  1955年   85篇
  1954年   77篇
  1948年   64篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
101.
102.
Malattia Leventinese (ML) and Doyne honeycomb retinal dystrophy (DHRD) refer to two autosomal dominant diseases characterized by yellow-white deposits known as drusen that accumulate beneath the retinal pigment epithelium (RPE). Both loci were mapped to chromosome 2p16-21 (refs 5,6) and this genetic interval has been subsequently narrowed. The importance of these diseases is due in large part to their close phenotypic similarity to age-related macular degeneration (AMD), a disorder with a strong genetic component that accounts for approximately 50% of registered blindness in the Western world. Just as in ML and DHRD, the early hallmark of AMD is the presence of drusen. Here we use a combination of positional and candidate gene methods to identify a single non-conservative mutation (Arg345Trp) in the gene EFEMP1 (for EGF-containing fibrillin-like extracellular matrix protein 1) in all families studied. This change was not present in 477 control individuals or in 494 patients with age-related macular degeneration. Identification of this mutation may aid in the development of an animal model for drusen, as well as in the identification of other genes involved in human macular degeneration.  相似文献   
103.
Warm feet promote the rapid onset of sleep.   总被引:5,自引:0,他引:5  
K Kr?uchi  C Cajochen  E Werth  A Wirz-Justice 《Nature》1999,401(6748):36-37
  相似文献   
104.
E V Koonin  L Aravind  K Hofmann  J Tschopp  V M Dixit 《Nature》1999,401(6754):662; discussion 662-662; discussion 663
  相似文献   
105.
106.
This paper defines a new class of generalized type I functions, and obtains Kuhn-Tucker necessary and sufficient conditions and duality results for constrained optimization problems in the presence of the aforesaid weaker assumptions on the objective and constraint functions involved in the problem.  相似文献   
107.
While stable in CH2Cl2, hexane or THF, in the presence of MeOH, self-promoted dimerization of the triarylphosphine-alkene 1, a ligand for Pd-catalyzed reactions, produced an unusual racemic bis(phosphine) 2 in high yield. The reaction of 2 with Pd(dba)2, followed by oxidative addition of p-IC6H4NO2, yielded a trans-chelated Pd(II) aryl iodide complex.  相似文献   
108.
This paper proposes an interval method to explore the relationship between the exchange rate of Australian dollar against US dollar and the gold price,using weekly,monthly and quarterly data.With the interval method,interval sample data are formed to present the volatility of variables. The ILS approach is extended to multi-model estimation and the computational schemes are provided. The empirical evidence suggests that the ILS estimates well characterize how the exchange rate relates to the gold price,both in the long-run and short-run.The comparison between the interval and point methods indicates that the difference between the OLS and the ILS estimates is increasing from weekly data to quarterly data,since the lowest frequency point data lost the most information of volatility.  相似文献   
109.
Machine intelligence,is out of the system by the artificial intelligence shown.It is usually achieved by the average computer intelligence.Rough sets and Information Granules in uncertainty management and soft computing and granular computing is widely used in many fields,such as in protein sequence analysis and biobasis determination,TSM and Web service classification Etc.  相似文献   
110.
Effect of the bacterial inoculant Sil-All (short for ‘ SA‘ ) on corn silage quality, digestibility and performance in dairy cattle was studied. SA treated silage resulted in the higher level of retained protein and slightly higher level of residual sugars in that treatment, the better digestibility of the neutral detergent fibre (NDF) and the acid detergent fibre (ADF), the lower pH and evolution of ammonia compared to the control; The fall in pH was most rapid in the SA treated silage in the first 4 days of ensilage, when it matters most for the conservation of protein, compared with the control silage and this was linked more to both lactic and total acids. Both volatile fatty acid (VFA) and lactate content increased with ensiling time, increase degree reached up near 100%; Lactate content in treatment silage was higher than that in the control, and this difference was all maintained at the level of approximately 7% - 13% almost in all cases, at length, up 16% in the case of day 15; pH value decreased with ensiling time. Moreover, pH value in most of treatment were lower than that in the control ; The digestibility of both dry matter (DM) and crude protein (CP) was appreciably improved by the use of inoculant SA. Also, in relation to reductions, of NDF and ADF were noted. An increase in milk yield of the order of 0.9kg per head per day in favour of SA was observed. Alternatively, with an average daily feed intake of 20kg, this indicates with 1 ton of corn silage milk yield could be increased by 46.5kg.  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