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   11249篇
  免费   650篇
  国内免费   573篇
化学   4234篇
晶体学   173篇
力学   116篇
综合类   25篇
数学   80篇
物理学   7844篇
  2024年   7篇
  2023年   90篇
  2022年   151篇
  2021年   131篇
  2020年   192篇
  2019年   214篇
  2018年   212篇
  2017年   290篇
  2016年   393篇
  2015年   393篇
  2014年   828篇
  2013年   724篇
  2012年   480篇
  2011年   957篇
  2010年   670篇
  2009年   783篇
  2008年   735篇
  2007年   854篇
  2006年   697篇
  2005年   528篇
  2004年   469篇
  2003年   409篇
  2002年   355篇
  2001年   363篇
  2000年   248篇
  1999年   264篇
  1998年   230篇
  1997年   133篇
  1996年   141篇
  1995年   98篇
  1994年   67篇
  1993年   65篇
  1992年   51篇
  1991年   36篇
  1990年   42篇
  1989年   24篇
  1988年   25篇
  1987年   28篇
  1986年   14篇
  1985年   11篇
  1984年   17篇
  1983年   6篇
  1982年   6篇
  1981年   4篇
  1980年   6篇
  1979年   8篇
  1978年   5篇
  1975年   3篇
  1974年   3篇
  1973年   6篇
排序方式: 共有10000条查询结果,搜索用时 234 毫秒
131.
Polymethyl methacrylate (PMMA) sponges were obtained by polymerization in a solution with monomer/ethanol ratios up to 20:80. The material obtained after the elimination of the solvent present a homogeneous distribution of dispersed pores up to a monomer/ethanol ratio lower than 40:60. For higher ethanol contents in the reacting mixture, the morphology of the sponge corresponds to a network of PMMA microparticles, leaving large empty spaces leading to highly porous structure. The monomer/ethanol ratio during polymerization has a large influence on the porosity, thermal, and mechanical properties of the material and, for large solvent contents, on the size of the polymer microparticles.  相似文献   
132.
线性扫描极谱法测定微量肉桂酸   总被引:4,自引:0,他引:4  
在 1mol·L-1HOAc NaOAc介质中 (pH =3.6 ) ,肉桂酸有一还原峰 ,其峰电位为 - 1.4 7V(vs.SCE)。峰电流与肉桂酸浓度在 2 .0× 10 -5~ 8.0× 10 -4 mol·L-1之间呈线性关系 (r =0 .9989) ,检出限为 1.0× 10 -5mol·L-1。该法应用于肉桂酸含量的测定 ,结果满意 ,并对肉桂酸的电化学性质进行了研究  相似文献   
133.
134.
A differential scanning calorimetric, thermogravimetric and electron microscopic investigation has been carried out on the uncalcified areas of turkey leg flexor tendon as a function of age. Rehydrated samples exhibit an increase of thermal stability with age. The HD values drop from about 11 cal·g–1 in the first weeks of life down to 7 cal·g–1 after the 11th week.At about 11 weeks, the collagen fibril diameter distribution passes from unimodal to multimodal. The DSC curves as well as the TG-DTG curves recorded from dried samples do not show any appreciable difference with ageing. The variations in thermal behaviour of rehydrated samples and fibril diameter distribution could be related to modifications in water binding with ageing.The Authors are grateful to Dr. G. Fabris for discussion and help in the selection of the samples. They also wish to thank Mr. G. Pizzuto for excellent technical assistance. The financial support by Consiglio Nazionale delle Ricerche is gratefully acknowledged.  相似文献   
135.
本文用DSC方法研究了羟酸型含氟离聚体中不同金属离子种类、可离子化基团含量、配位结构单元构型及离子微区大小对离聚体中离子微区稳定性的影响。实验表明:离聚体中金属离子配位能力愈强,羟酸含量愈高,离子微区尺寸愈大,则相应离聚体中离子微区稳定性愈大。铅高聚体>锌离聚体>钙离聚体>钠离聚体。  相似文献   
136.
Resolution of enantiomers by HPLC on cellulose derivatives   总被引:4,自引:0,他引:4  
Ichida  A.  Shibata  T.  Okamoto  I.  Yuki  Y.  Namikoshi  H.  Toga  Y. 《Chromatographia》1984,19(1):280-284
Summary Various polysaccharide derivatives, particularly cellulose derivatives, were synthesized and used as chiral stationary phases for optical resolution by HPLC after being adsorbed on macroporous silica gel. Cellulose triacetate (CTA-II), which was synthesized under homogeneous conditions, showed a chiral recognition ability for many racemates. Other cellulose derivatives such as cellulose tribenzoate (OB), cellulose-trisphenylcarbamate (OC), cellulose tribenzyl ether (OE), and cellulose tricinnamate (OK) also showed unique chiral recognition. Among other polysaccharide derivatives, curdlan triacetate was also exhibited an effective chiral recognition. Presented at the 15th International Symposium on Chromatography, Nürnberg, October 1984  相似文献   
137.
The thermal stability of heat-stabilised polyamide 66 in an oxidative environment is evaluated by DSC. The oxidative stability of the polyamide decreases as a result of repeated injection moulding. The results also indicate that the presence of glass fibres in the polyamide has a negative influence on the oxidative stability. Both isothermal and dynamic DSC measurements seem to be useful tools for assessing the stability of polyamides and there is a relationship between data determined using both procedures. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   
138.
应用X射线衍射、偏光显微镜及电子显微镜研究了胆甾液晶与甲基丙烯酸甲酯(MMA)─甲基丙烯酸丁酯(BMA)无规共聚物共混体系的形态结构。研究了体系的结晶态及液晶态的行为和共聚物含量及组成对光学织构的影响。  相似文献   
139.
Silver halide (AgX) microcrystal was used as template to synthesize hollow polyelectrolyte capsules. These hollow capsules were characterized by laser light scattering (LLS) used to measure the size of the capsules in solution. The ratio of hydrodynamic radius (Rh) from dynamic LLS to the radius of gyration (Rg) from static LLS is almost unity, revealing that the entities are hollow in solution. The results suggest that the LLS method can be regarded as a good complement to the confocal laser scanning microscopy (CLSM) method for the characterization of small hollow capsules, and it possesses the advantage of not needing fluorescence labeling.  相似文献   
140.
Ramírez  C.  Abad  M. J.  Barral  L.  Cano  J.  Díez  F. J.  López  J.  Montes  R.  Polo  J. 《Journal of Thermal Analysis and Calorimetry》2003,72(2):421-429
A new material belongs to the family of polyhedral oligomeric silsesquioxanes, the 1-(3-glycidyl) propoxy-3,5,7,9,11,13,15-isobutylpentacyclo-[9.5.1.1(3,9).1(5,15).1(7,13)]octasiloxane (glycidylisobutyl-POSS) is characterized by differential scanning calorimetry, thermogravimetric analysis and atomic force microscopy. Epoxy systems based on diglycidyl ether of bisphenol A (DGEBA) cured with the diamines, 4,4'-diamine-diphenylmethane (DDM) and 1,4-phenylenediamine (pPDA), were kinetically studied by differential scanning calorimetry in isothermal and dynamic modes. The thermal behaviour of these systems as the glycidylisobutyl-POSS was added, is discussed later. This revised version was published online in July 2006 with corrections to the Cover Date.  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