全文获取类型
收费全文 | 2346篇 |
免费 | 56篇 |
国内免费 | 381篇 |
专业分类
化学 | 2560篇 |
晶体学 | 18篇 |
力学 | 6篇 |
综合类 | 12篇 |
数学 | 2篇 |
物理学 | 185篇 |
出版年
2023年 | 23篇 |
2022年 | 54篇 |
2021年 | 45篇 |
2020年 | 68篇 |
2019年 | 46篇 |
2018年 | 64篇 |
2017年 | 75篇 |
2016年 | 77篇 |
2015年 | 66篇 |
2014年 | 79篇 |
2013年 | 212篇 |
2012年 | 113篇 |
2011年 | 117篇 |
2010年 | 109篇 |
2009年 | 139篇 |
2008年 | 181篇 |
2007年 | 140篇 |
2006年 | 136篇 |
2005年 | 145篇 |
2004年 | 123篇 |
2003年 | 95篇 |
2002年 | 77篇 |
2001年 | 60篇 |
2000年 | 66篇 |
1999年 | 59篇 |
1998年 | 49篇 |
1997年 | 56篇 |
1996年 | 42篇 |
1995年 | 48篇 |
1994年 | 44篇 |
1993年 | 31篇 |
1992年 | 38篇 |
1991年 | 17篇 |
1990年 | 20篇 |
1989年 | 13篇 |
1988年 | 10篇 |
1987年 | 7篇 |
1986年 | 7篇 |
1985年 | 6篇 |
1984年 | 6篇 |
1983年 | 2篇 |
1982年 | 4篇 |
1981年 | 1篇 |
1980年 | 5篇 |
1979年 | 5篇 |
1978年 | 1篇 |
1977年 | 2篇 |
排序方式: 共有2783条查询结果,搜索用时 15 毫秒
41.
The chemical composition of the essential oils of the flowers and leaves of Anthemis hyalina were analyzed by GC and GC-MS for the first time. The oils were found to contain seventy-two components. cis-Chrysanthenyl acetate (14.9% and 17.8%), camphor (11.6% and 1.7%), terpinen-4-ol (8.3% and 1.2%), germacrene-D (5.1% and
2.1%), β-caryophyllene (4.1% and 5.4%), myrcene (3.6% and 16.9%), bicyclogermacrene (3.5% and 0.9%), α-pinene (2.3% and 4.1%), cis-β-ocimene (2.1% and 4.3%) and isospathulenol (0.4% and 4.3%) were found to be the major constituents of the oils of flowers
and leaves respectively.
Published in Khimiya Prirodnykh Soedinenii, No. 5, pp. 428–429, September–October, 2006. 相似文献
42.
The first part of the paper deals with a critical discussion of the methodical basis of essential work of fracture (EWF) concept with respect to the specimen geometry (especially the notch depth) and application to polymers. In the second part, an in situ testing device, which combines a tensile testing machine with an optical strain-field measuring system, has successfully demonstrated possibility of characterization of fracture behaviour of polystyrene-polybutadiene block copolymers and block copolymer/homopolymer blends as examples of nanostructured polymer materials. It has been shown that knowledge of the time evolution of the strain field close to the crack tips leads to a simple verification of the basic precondition for the applicability of the EWF concept, the precondition “plastic zone coalescence-before-stable crack propagation”. 相似文献
43.
44.
45.
有机相中α-氰基-3-苯氧基苄醇乙酯的酶促醇解反应 总被引:1,自引:1,他引:1
研究了有机相中脂肪酶催化α-氰基-3-苯氧基苄醇乙酯的醇解化反应。制备α -氰基-3-苯氧基苄醇。考察了酶、溶剂、醇、醇用量、溶剂水含量以及底物浓度等 因素对反应的影响,结果表明Novozym435脂肪酶催化活性最高,经实验确定的最佳 条件为:脱水甲苯为溶剂,正辛醇为酰基受体,正辛醇、酯的摩尔比为1.5:1,酶 量为8 mg/mL时的最佳底物浓度为108.13 mmol/L,在上述条件下反应30 h酯的转化 率 > 96%。 相似文献
46.
Paavo?Mansikkam?ki Manu?Lahtinen Kari?RissanenEmail author 《Cellulose (London, England)》2005,12(3):233-242
The completeness of mercerisation can be evaluated by investigating the changes in the crystalline regions of cellulose from
cellulose I (C-I) to cellulose II (C-II) by the X-ray powder diffraction method. Mercerisation experiments in four different
solution systems: ethanol/water, acetone, DMSO and xylene, are reported. Also the effect of some additives, external pressure,
treatment time and alkalisation temperature were studied. In two-phase solvent systems, structural changes of cellulose crystallites
depended primarily on the distribution and solubility of sodium hydroxide in the solvent phases. The sodium hydroxide concentration
in the hydrophilic phase must exceed 7–8 w/w-% before complete crystal change from C-I to C-II can occur. The precipitation
of sodium hydroxide due to high concentration prevents the successful use of one-phase ethanol/water system in slurry process.
On the contrary, the 2-propanol/water/sodium hydroxide system separates into two layers; to the water-rich lower layer and
the 2-propanol-rich upper layer, where the sodium hydroxide remains mainly in the water-rich lower layer. This prevents the
precipitation of sodium hydroxide and promotes the alkalisation of cellulose. Ammonium chloride and ammonium hydroxide clearly
had a positive effect by promoting the crystal changes, however, the urea concentration used in this study was obviously too
small. In the advantageous two-phase 2-propanol/water systems, the alkalisation time was only 15 min when the treatment temperature
was kept between 0 and 10 °C. Reduced external pressure was found to have a small but still detectable positive effect on
cellulose alkalisation while over-pressure prevented crystal changes. 相似文献
47.
纤维素/甲壳素共混膜的结构表征与抗凝血性能 总被引:20,自引:0,他引:20
以 6wt %NaOH 4wt%尿素为纤维素的新溶剂 ,采用溶液共混法制备出纤维素 甲壳素共混膜 ,为甲壳素在碱性溶液中制膜提供了新的方法 .红外光谱、X 射线衍射、扫描电镜和力学性能、抗凝血性能测试结果表明 ,共混膜中甲壳素含量低于 4 0wt%时 ,纤维素与甲壳素分子间具有良好的相容性 ;在纤维素中引入适量甲壳素可提高共混膜的抗张强度 ,共混膜的干、湿态抗张强度在甲壳素含量 10wt%时最大 ,其值分别为 89 1MPa和 4 3 7MPa ,比纯态纤维素膜的干、湿态抗张强度分别提高了 6 7%和 11 5 % ;甲壳素的引入可明显降低血小板在共混膜表面的粘附、凝聚与变性 ,增大共混膜的抗凝血参数 ,甲壳素含量达到 5 0wt%时 ,该共混膜具有良好的抗凝血性能 相似文献
48.
Preparation of cellulose and cellulose derivative azo compounds 总被引:1,自引:0,他引:1
Maha Ibrahim 《Cellulose (London, England)》2002,9(3-4):337-349
Wood pulp and cotton linter are the most common sources of cellulose forindustrial use. Methyl cellulose (MC) and cellulose sulfate (CS) were preparedusing bleached wood pulp and cotton linter. Coloured azo compounds were alsoprepared from coupling cellulose, wood pulp, MC and CS with aromatic diazoniumsalt. The presence of electron-releasing or withdrawing substituents affectedthe electrophilic substitution reaction. The produced azo compounds werecharacterized by FT-IR methodology, as well as mass spectrometry, in which thefunctional groups and the ion fragments of the products were analyzed. 相似文献
49.
Ammonium acetate was found to catalyze efficiently the selective deprotection of aromatic acetates in the presence of various sensitive functionalities in aqueous methanol under neutral conditions at room temperature to yield the corresponding phenols in excellent yields. The method has been utilized for deprotection of acetates of several naturally occurring bioactive phenolic compounds and for preparation of venkatasin, a natural coumarino-lignan, from the anticancer compound cleomiscosin A. 相似文献
50.
An efficient and a quick microwave‐assisted synthesis of benzimidazoles and trisubstituted imidazoles was developed. Three benzimidazoles were obtained as a result of the condensation of 1,2‐phenylenediamine with carboxylic acids and acetoacetic ester without catalyst. A series of trisubstituted imidazoles were synthesized by condensation of benzil, aromatic aldehyde and ammonium acetate in the presence of glacial acetic acid. 相似文献