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   3483篇
  免费   289篇
  国内免费   1336篇
化学   3886篇
晶体学   107篇
力学   86篇
综合类   41篇
数学   248篇
物理学   740篇
  2024年   4篇
  2023年   24篇
  2022年   66篇
  2021年   83篇
  2020年   86篇
  2019年   99篇
  2018年   78篇
  2017年   112篇
  2016年   119篇
  2015年   122篇
  2014年   164篇
  2013年   415篇
  2012年   232篇
  2011年   205篇
  2010年   169篇
  2009年   190篇
  2008年   248篇
  2007年   290篇
  2006年   258篇
  2005年   218篇
  2004年   207篇
  2003年   179篇
  2002年   167篇
  2001年   127篇
  2000年   141篇
  1999年   145篇
  1998年   104篇
  1997年   108篇
  1996年   99篇
  1995年   89篇
  1994年   84篇
  1993年   60篇
  1992年   82篇
  1991年   53篇
  1990年   50篇
  1989年   62篇
  1988年   39篇
  1987年   23篇
  1986年   19篇
  1985年   26篇
  1984年   14篇
  1983年   22篇
  1982年   11篇
  1981年   4篇
  1980年   3篇
  1979年   4篇
  1978年   1篇
  1975年   1篇
  1973年   1篇
  1968年   1篇
排序方式: 共有5108条查询结果,搜索用时 31 毫秒
131.
葡萄糖异构酶加速葡萄糖与果糖的平衡,平衡时果糖含量为42%左右,体系中加入一些硼酸盐,果糖的含量提高到80%左右,究其原因可能是由于葡萄糖和果糖与硼酸盐形成不同稳定性的配合物。虽然Roy,Conner,Daris,Belcher,Lorand等都已报导了这些配合物的稳定常数,概括结果分歧较大。Belcher曾首次报导了硼酸与D-果糖的配位数为  相似文献   
132.
利用圆二色谱研究了β-环糊精(β-CD)对D/L酪氨酸的手性识别行为,制备出了β-CD与L-酪氨酸(L-Tyr)的固体超分子化合物,并用元素分析、薄层分析、X射线粉末衍射及热分析对包合物进行了表征,用荧光光谱法测定了包合物的形成常数.实验结果表明,β-CD具有选择包结L-酪氨酸的特性;主客体形成11的包合物,其组成为L-Tyr/β-CD·12H2O;稳定常数为5.13×103L/mol;包合物的热稳定性比主客体皆有改善  相似文献   
133.
The electrical and magnetic properties of the tetragonal phase SmCuOSe are reported as a function of the temperature. The optical properties were studied by means of diffuse reflectance spectrum in the UV-Vis range. The electrical resistivity measurements as well as diffuse reflectance spectrum show that SmCuOSe is a semiconductor with an optical band gap (Eg) of 2.6 eV. In this phase, Cu is at its monovalent oxidation state and, as such, it does not contribute to the total magnetic moment, whereas Sm is in its 3+ oxidation state, with a large VanVleck contribution due to the admixture of the fundamental state with higher energy levels.  相似文献   
134.
We report a novel methodology for rapid and quantitative screening of O-glycosylation reactions of application to the analysis of parallel reaction systems. Our system exploits perdeuterated benzyl (Bn-d7) ether, and stereoselectivity and yield are evaluated by 1H NMR and MALDI-TOF MS, respectively. This paper summarizes over 240 screenings of 1 → 3 linkage formation between glucose residues targeting the α-isomer in high yield.  相似文献   
135.
合成了五个2,6-二乙酰吡啶缩肼基硫代甲酸酯双希夫碱合铜(Ⅱ)配合物,用元素分析、磁化率、红外光谱及紫外-可见光谱等对它们进行了表征,研究了配合物的电化学性质和Cu3L22X2(X=Cl-、SCN-)的光电子能谱。结果表明:五个Cu(Ⅱ)配合物均为三核配合物,在Cu3L22(SCN)2中存在Cu(Ⅱ)间的自旋-交换作用。  相似文献   
136.
LaSrBO4(B=Cu、Ni、 Co、 Fe、 Mn、 Cr ) was studied with respect to their preparation, characteristics and catalytic oxidation activity by means of XRD, XPS, electric conductivity and activity evaluation. Results showed that the calcination temperature has great influence on the formation of the phases of such samples, and was associated with the radius of B ion. The greater the B ion radius, the higher the calcination temperature required for the formation of the phases. It was also found that the activity and the relative content of adsorptive oxygen and lattice oxygen on the sample surf are, the activation energy of electron conduction and the CO oxidation activity may vary with different B ions, and demonstrate a dual-peak pattern with the increase in the number of 3d electrons of the B ion.  相似文献   
137.
以二氨基磺酸盐配合物合成了一系列主链上合金属元素(Ca,Ni,Co,Cu)的聚脲聚合物.用IR和1HNMR对其结构进行了表征,以TG-DTA研究了其热性能,并讨论了金属元素种类及其含量对聚脲聚合物溶液粘度的影响.  相似文献   
138.
Intercalation of alkylalcohols into -zirconium phosphate was investigated at 25°C and/or under reflux.n-Alcohols having two to five carbons and 2-propanol were taken up at 25°C. These alcohols, andn-hexanol and heptanol, also intercalated under reflux.n-Alcohols having eight to eighteen carbon atoms intercalated when a stepwise method was employed. 2-Butanol and tertiary amylalcohols intercalated under reflux using a butanol intercalate as a starting material. Ethanol-to-butanol intercalates were unstable at room temperature, losing alcohols and changing to -zirconium phosphate. The particle size of the -zirconium phosphate did not affect the intercalation of alcohols.  相似文献   
139.
Molar excess mixing enthalpies h E , Gibbs free energies g E and hence entropies s E have been obtained using calorimetry and the vapor sorption method at 25°C for hexane isomers+2,2,4,4,6,8,8-heptamethylnonane, a highly branched C 16 . The h E and g E are negative while Ts E are positive, but small. The values are explained by the Prigogine-Flory theory through negative free volume contributions to h E and Ts E , counterbalanced in the case of Ts E by the positive combinatiorial Ts E for mixing molecules of different size. No contribution is seen from the interaction between methyl and methylene groups. The excess quantities are also obtained for hexane and heptane isomers mixed with n-hexadecane. Values of h E and Ts E are now strongly positive, while those of g E are only slightly less negative. The interpretation requires two recently advanced contributions in addition to those of the Prigogine-Flory theory: 1) a decrease of order when correlations of orientations between n-C 16 molecules in the pure liquid are replaced in the solution by weaker correlations whose strengths depend on the shapes of the lower alkane isomers. For lower alkane isomers of the same shape, but highly sterically hindered, h E and Ts E are small, manifesting, 2) a negative contribution, ascribed to a rotational ordering of n-C 16 segments on the sterically-hindered molecule. Enthalpy-entropy compensation is observed for these new contributions, arising from their rapid fall-off with increase of temperature.  相似文献   
140.
CHARACTERIZATIONOFRADIATIONGRAFTCOPOLYMEROFINORGANICCOMPOUNDONTOALKENEZhangWanxi;CheJitai;YanMeilan(ChangchuninstituteofAppli...  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