全文获取类型
收费全文 | 1955篇 |
免费 | 66篇 |
国内免费 | 356篇 |
专业分类
化学 | 914篇 |
力学 | 118篇 |
综合类 | 9篇 |
数学 | 448篇 |
物理学 | 888篇 |
出版年
2016年 | 5篇 |
2015年 | 13篇 |
2014年 | 7篇 |
2013年 | 19篇 |
2012年 | 37篇 |
2011年 | 424篇 |
2010年 | 240篇 |
2009年 | 221篇 |
2008年 | 34篇 |
2007年 | 38篇 |
2006年 | 50篇 |
2005年 | 119篇 |
2004年 | 350篇 |
2003年 | 227篇 |
2002年 | 139篇 |
2001年 | 125篇 |
2000年 | 45篇 |
1999年 | 22篇 |
1998年 | 42篇 |
1997年 | 28篇 |
1996年 | 20篇 |
1995年 | 9篇 |
1994年 | 11篇 |
1993年 | 38篇 |
1992年 | 43篇 |
1991年 | 20篇 |
1990年 | 22篇 |
1989年 | 22篇 |
1988年 | 2篇 |
1987年 | 1篇 |
1986年 | 3篇 |
1985年 | 1篇 |
排序方式: 共有2377条查询结果,搜索用时 15 毫秒
981.
982.
Kui JIAO Tao YAN G Zeng Jian WANG College of Chemistry Molecular Engineering Qingdao University of Science Technology Qingdao College of Chemistry Chemical Engineering Ocean University of China Qingdao 《中国化学快报》2005,(5)
3,3′,5,5′-Tetramethylbenzidine(TMB)-H2O2-horseradish peroxidase(HRP) voltammetric enzyme linked immunoassay system1 has very high sensitivity, low detection limit and wide detection range for the determination of some plant viruses. However, the understanding of the mechanism of HRP catalyzed by H2O2 oxidizing TMB in this system is of significance. In the previous paper, we have reported the spectroelectro- chemical study of TMB on SnO2: F film optically transparent electrode in the … 相似文献
983.
Thickness and stability of films formed by different surfactants are studied by means of thin film balance (TFB) technique to observe the formation and stability of the films. It is demonstrated that stable Newton black films (NBFs) can be easily obtained with non-ionic surfactants (C12E5, C12G2) than ionic surfactants (C12TAB, C16TAB). Common black film (CBF) was obtained with C16TAB at 5×10-3 mol/L, while the film of C12TAB is unstable. It has been demonstrated that the horizontal forces should also be taken into consideration for explaining film stability. 相似文献
984.
Separation of Felted Explosives by Pressurized Microemulsion Electrokinetic Chromatography 总被引:1,自引:0,他引:1
JingJIANG SuXuanGONG HuWeiLIU YongZHANG YuLinDENG JunLingGU AiQinLUO LiXinWANG 《中国化学快报》2004,15(7):831-833
A new MEEKC method assisted with pressure-driven mobile phase was presented for the separation of felted explosives. Microemulsion solution was composed of 80 mmol/L heptane-120 mmol/L SDS (sodium dodecyl sulphate)-900 mmol/L butanol-10 mmol/L borate at pH 9.4 and a pressure-driven flow of 0.020 mL/min under 1.3 MPa was employed to manipulate the separation. Explosives HMX (1,3,5,7-tetranitro-1,3,5,7-tetrazacyclooctane) and TATB(triamino-trinitrobenzene), which were felted on fluorine rubber F2311 (polytrifluorochlorethylene and polyvinylidene fluoride 1/1 co-polymerization) and F2314 (polytrifluorochlorethylene and polyvinylidene fluoride 4/1 co-polymerization) were well separated with very good peak shapes. 相似文献
985.
实验发现,在硫酸介质及加热下,痕量钼(Ⅵ)对硫酸联氨还原甲基红这一缓慢褪色反应具有强烈催化作用;甲基红在氢氮化钠介质中于-0.70V.SCE处产生一灵敏的示波极谱波。据此,本文采用固定时间法,用示波极谱法研究了利用这一新的指示反应催化测定钼的影响因素,建立了一个检出限和测定范围分别为0.8ng/mL和1.6~100ng/mL钼的催化反应-示波极谱法,并用于测定矿石和钢样中的钼。 相似文献
986.
CHEN Shuixia ZENG Hanmin Materials Science Institute Zhongshan University Guangzhou China 《Chinese Journal of Reactive Polymers》2002,(2)
1. INTRODUCTION The serious environment pollution and natural resources waste is imperiling human existence and development. To counter the exhaustion and dilution of natural resources, and to prevent environment from further pollution, it is their duty … 相似文献
987.
988.
YanPengZHENG JinYuanMO 《中国化学快报》2004,15(10):1209-1211
Enantiomeric separation of epinephrine and salbutamol was investigated by micellar electrokinetic chromatography employing β-cyclodextrin as chiral additive in ammonium chloride-ammonia solution. The analytes were detected by electrochemistry using gold microelectrode at 0.65 V versus SCE reference electrode. The effects of detection potential,concentration of β-cyclodextrin, concentration of sodium dodecyl sulfate, pH value of electrolyte and applied voltage were discussed. 相似文献
989.
990.
1,2-(1-Acridin-10'-y1-2-aza-2-methylprop-1,3-ylene)fullerene was synthesized firstly and characterized byUV-Vis,~1H NMR,~(13)C NMR and electrospray ionization mass spectroscopy,which is capable of forming a stablecomplex with zinc tetraphenylporphyrin via the axial ligafion.The steady state fluorescence studies show efficientquenching of the zinc tetraphenylporphyrin emission upon axial coordination of acridine attached to C_(60). 相似文献