全文获取类型
收费全文 | 8971篇 |
免费 | 1396篇 |
国内免费 | 1093篇 |
专业分类
化学 | 6433篇 |
晶体学 | 86篇 |
力学 | 406篇 |
综合类 | 102篇 |
数学 | 1030篇 |
物理学 | 3403篇 |
出版年
2024年 | 15篇 |
2023年 | 194篇 |
2022年 | 200篇 |
2021年 | 295篇 |
2020年 | 386篇 |
2019年 | 378篇 |
2018年 | 304篇 |
2017年 | 302篇 |
2016年 | 421篇 |
2015年 | 417篇 |
2014年 | 516篇 |
2013年 | 620篇 |
2012年 | 822篇 |
2011年 | 799篇 |
2010年 | 530篇 |
2009年 | 479篇 |
2008年 | 607篇 |
2007年 | 586篇 |
2006年 | 479篇 |
2005年 | 434篇 |
2004年 | 296篇 |
2003年 | 244篇 |
2002年 | 234篇 |
2001年 | 211篇 |
2000年 | 221篇 |
1999年 | 185篇 |
1998年 | 175篇 |
1997年 | 146篇 |
1996年 | 161篇 |
1995年 | 144篇 |
1994年 | 108篇 |
1993年 | 98篇 |
1992年 | 81篇 |
1991年 | 61篇 |
1990年 | 63篇 |
1989年 | 40篇 |
1988年 | 37篇 |
1987年 | 32篇 |
1986年 | 25篇 |
1985年 | 34篇 |
1984年 | 15篇 |
1983年 | 14篇 |
1982年 | 15篇 |
1981年 | 6篇 |
1980年 | 7篇 |
1979年 | 6篇 |
1978年 | 2篇 |
1977年 | 4篇 |
1976年 | 6篇 |
1962年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 375 毫秒
161.
162.
Shen J Ye Y Hu J Shen H Le Z 《Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy》2001,57(3):551-559
Copper(II), zinc(II), cobalt(II) and cobalt(III) complexes of N-D-glucosamine beta-naphthaldehyde (C17H19O6N, NG) and glycine were synthesized. The four novel metal complexes, Cu(II)C19H28O11N2(CuGNG), Zn(II)C19H24O9N2 (ZnGNG), Co(II)C19H28O11N2(Co(II)GNG) and Co(III)C21H29O12N2(Co(III)GNG) were characterized by means of infrared (IR), electronic absorption spectroscopy and NMR etc. The surface-enhanced Raman spectra of the four complexes and their interaction with DNA were studied. By comparison of the surface-enhanced Raman spectra (SERS), the information of the four complexes' SER active sites and adsorption orientation were obtained. Combined with fluorescence spectra of Ethidium bromide (EthBr) DNA system, we concluded that none of the four complexes intercalate into DNA and that the presence of the glycine ligand lowered the anticancer activity of NG series complexes. 相似文献
163.
邻苯二亚胺纤维素水溶液的荧光行为 总被引:3,自引:0,他引:3
目前,用于制造光致发光材料的基材均为合成高分子材料,如聚氯乙烯(PVC)等热塑性材料以及不饱和聚酯等热固性材料[1].天然高分子材料发光性能的研究并不多见.而与合成高分子相比,纤维素的结构特征决定了它易参与化学反应,可用以制备各种用途的功能材料,如高... 相似文献
164.
V. Ye. Zaichick 《Journal of Radioanalytical and Nuclear Chemistry》1993,169(2):307-316
A facility developed for the in-vivo neutron activation analysis (IVNAA) of calcium in some parts of tubular limb bones, in the hand, foot and spine is described. The48Ca(n, )49Ca reaction is used, the gamma-rays of49Ca (E=3.08 MeV, T1/2=8.8 min) are measured. The irradiation is carried out with five of ten238Pu–Be neutron sources with a source stength of 5·107 n s–1 each arranged in a bath filled with water. NaI(T1) detectors (from 2 to 4 in number) of 150×100 mm size supplied with lead and shadow shielding are used in the counting unit. The construction of the facility started in 1972 and has been in operation since 1974. It has been used for the examination of patients suffering from limb bone tumors, of children with rickets-like and similar diseases and for studies in space medicine. 相似文献
166.
Cu(I)/Diamine-catalyzed Aryl-alkyne Coupling Reactions 总被引:1,自引:0,他引:1
Ye Feng WANG Wei DENG Lei LIU Qing Xiang GUO 《中国化学快报》2005,16(9):1197-1200
Arylalkynes are important building blocks for the synthesis of natural products,pharmaceuticals,and artificial molecular devices1.They are often synthesized via the Pd-catalyzed Sonogashira coupling reactions between aryl halides and terminal alkynes2,3.Unfortunately,it remains difficult to apply the Sonogashira reaction to industrial scale and/or pharmaceutical synthesis,due to the high cost of Pd and the difficulty in removing the toxic Pd residues from the reaction products.Thus it is wor… 相似文献
167.
A combination of a DNA ligase and a restriction endonuclease provides a DNA polymerase activity, which might suggest a novel strategy for polymer synthesis. 相似文献
168.
Using the mixture of cetyltrimethylammonium bromide (CTAB) and p‐Octyl polyethylene glycol phenyl ether (OP‐10) as templates, siliceous MCM‐48 materials can be synthesized with low molar ratio of CTAB to silica (0.139:1) and low concentration of mixed surfactants (ca.5%) and within a wide range of OP‐10/CTAB ratio (0.08?0.25). The materials were characterized by X‐ray powder diffraction, N2 adsorption/desorption isotherm, TEM, TG‐DSC and 29Si MAS NMR. Measurements indicated that the use of mixed surfactants allowed better condensation and higher ordering of the cubic mesostructure; at the same time, some properties of these materials were sensitive to the OP‐10/CTAB ratio. It was also found that the reduced pH of the gel which had been crystallized for a certain time gave a highly reproducible synthesis with a high silica yield (about 95%). Furthermore, the reaction mechanism of the synthesis is discussed in detail. 相似文献
169.
岩,心是油气储层的基本单元,其内部结构和渗流性质反映了油藏的基本特征.岩。心的精细描述是油藏描述、储层动态监测及设计强化采油方案的重要基础.本文利用核磁共振(NMR)自旋密度做成像,快速无损地观测到两类基本储油岩石——砂岩和灰岩的内部结构,提供了岩石渗透性、孔隙性及灰岩沉积环境等重要信息.1实验方法以自旋回波单片NMR成像脉冲序列为基础,设。P平面内样品的目施密度为P(。,v).演化期t。,在。方向梯度场G。作用下,各处横向磁化矢量获得的相移为式中,7为共振核(在成像中一般为质子)的旋磁比,g为坐标位置·… 相似文献
170.
磷酸铝类分子筛是近年来继Y型和ZSM七分子筛之后的第三代合成分子筛材料,其骨架由A10。和P0。四面体均匀交替地组成问.由于带负电行的A10。和带正电荷的PO。四面体数目相等,整个骨架呈电中性,所以这类分子筛本身无离子交换能力和催化活性.当用硅或某些金属离子(如Mg、Fe、Co、Zn等)对磷酸铝分子筛进行同晶取代,就会在骨架上造成电行不平衡,从而使这类分子筛具有一定的离子交换能力和酸性【习.因而对硅或金属离子在磷酸错类分子筛中取代机理的研究一直是人们感兴趣的问题问.Vpl-5是最近才合成出来的具有18圆环一维孔结构的… 相似文献