全文获取类型
收费全文 | 7516篇 |
免费 | 998篇 |
国内免费 | 1146篇 |
专业分类
化学 | 5941篇 |
晶体学 | 130篇 |
力学 | 369篇 |
综合类 | 136篇 |
数学 | 862篇 |
物理学 | 2222篇 |
出版年
2024年 | 12篇 |
2023年 | 110篇 |
2022年 | 232篇 |
2021年 | 219篇 |
2020年 | 277篇 |
2019年 | 267篇 |
2018年 | 215篇 |
2017年 | 199篇 |
2016年 | 356篇 |
2015年 | 344篇 |
2014年 | 430篇 |
2013年 | 550篇 |
2012年 | 611篇 |
2011年 | 668篇 |
2010年 | 556篇 |
2009年 | 480篇 |
2008年 | 550篇 |
2007年 | 553篇 |
2006年 | 515篇 |
2005年 | 371篇 |
2004年 | 367篇 |
2003年 | 273篇 |
2002年 | 295篇 |
2001年 | 226篇 |
2000年 | 158篇 |
1999年 | 135篇 |
1998年 | 104篇 |
1997年 | 90篇 |
1996年 | 83篇 |
1995年 | 52篇 |
1994年 | 46篇 |
1993年 | 50篇 |
1992年 | 41篇 |
1991年 | 32篇 |
1990年 | 36篇 |
1989年 | 20篇 |
1988年 | 15篇 |
1987年 | 15篇 |
1986年 | 14篇 |
1985年 | 14篇 |
1984年 | 7篇 |
1983年 | 13篇 |
1982年 | 7篇 |
1981年 | 5篇 |
1980年 | 8篇 |
1978年 | 6篇 |
1974年 | 3篇 |
1973年 | 3篇 |
1969年 | 3篇 |
1928年 | 3篇 |
排序方式: 共有9660条查询结果,搜索用时 15 毫秒
981.
GuoXiangCHENG GuangLingPEI LingGangZENG LiYongZHANG ChaoLIU 《中国化学快报》2004,15(2):242-245
In this paper, the surface imprinted cross-linked polystyrene beads were prepared via suspension polymerization with styrene (St), divinylbezene (DVB), polyvinyl alcohol (PVA1788),the mixture of Span 85 and xylene or the mixture of Span 85 and paraffin as monomer,cross-linking agent, dispersion stabilizer and templates, respectively. The results indicate that there are dense cavities on the surface of beads, and the diameter and density of cavity are related with the composition and amount of emulsion template. The forming mechanism of cavity from thermodynamics and dynamics was proposed. 相似文献
982.
Direct Observation of Non-covalent Complexes for Phosphorylated Flavonoid-protein Interaction by ESI
XiaoLanCHEN TingZHANG HongXiaLIU LingBoQU YouZhuYU YuFenZHAO 《中国化学快报》2004,15(3):343-346
Diethyl flavon-7-yl phosphate was synthesized by modified Atheron-Todd reaction. The result of ESI shows that the phosphated flavonoids possess stronger binding affinities toward proteins such as myoglobin, insulin and lysozyme and are easier to form the non-covalent complexes with them. 相似文献
983.
Studies on Phase Behavior of Alkyl Polyglucoside Based on Microemulsions with Modified Fishlike Phase Diagram 总被引:1,自引:0,他引:1
JinLingCHAI GanZuoLI ZhaoYuDIAO GaoYongZHANG 《中国化学快报》2004,15(3):361-364
The three-phase behavior in the quaternary system of an alkyl (C8/10^- or C12/14^-)polyglucoside / 1-butanol / n-octane / water has been studied at 40℃ with the modified fishlike phase diagram, which is presented by us for the first time. The mass fraction of 1-butanol in the hydrophile-lipophile balanced interfacial layer, A^S, the coordinates of the start point B and the end point E of the phase diagram, and the solubilities of alkyl polyglucoside and 1-butanol in n-octane phase were calculated. The solubilization of the microemulsion was also discussed. 相似文献
984.
Ming Zhao WANG Guan Liang CAI Ling XIA Jun Jian YAO Hong Yan CHEN Zhao Xing MENG Bo Li LIUDepartment of Chemistry Beijing Normal University Beijing Chemical Defense Institute PLA Beijing 《中国化学快报》2004,15(4):495-497
The crystal structures of two potential tumor imaging agents and therapeutic agents -copper(Ⅱ) complexes with salicylidene-tyrosinato Schiff base and nitrogen-donor chelating Lewis base, [Cu(sal-tyr)(bipy)] 1 and [Cu(sal-tyr)(phen)]2CH3OH 2 are presented. Our work is helpful to get deep understanding of novel 64Cu tumor imaging agents and therapeutic agents. 相似文献
985.
MinGU FangZuYANG LingHUANG ShiBingYAO ShaoMinZHOU 《中国化学快报》2004,15(8):981-984
The nucleation mechanisms of cobalt from sulfate solutions were studied by utilizing the electrochemical technique, chronoamperometry. It was found that the recorded current-time transients introduced from 1.0mol/L CoSO4 solution were complexes with unusual shapes. All characteristic features were identified as separate process. The instantaneous or progressive nucleation with 2D or 3D growth exists during the cobalt deposition, depending on the applied potentials. 相似文献
986.
本研究在玻碳电极(GCE)表面电沉积金纳米粒子(Au NPs),通过化学吸附将微囊藻毒素-(亮氨酸-精氨酸)(MC-LR)的单克隆抗体(anti-MC-LR)固定在电沉积了Au NPs的玻碳电极表面,以牛血清白蛋白(BSA)封闭非特异性吸附位点,制得免疫电极anti-MC-LR/Au NPs/GCE。采用微乳化法制备了掺杂三(2,2'-联二吡啶)钌(Ⅱ)配合物离子(Ru(bpy)2+3)的二氧化硅纳米粒子(Ru@SiO2),利用透射电镜和扫描电镜对所制备的纳米粒子进行表征。3-氨基丙基三乙氧基硅烷(APTS)进一步与Ru@SiO2反应,制得氨基功能化的Ru@SiO2,通过1-(3-二甲氨基丙基)-3-乙基碳二亚胺(EDC)和N-羟基琥珀酰亚胺(NHS)活化辣根过氧化物酶标记的MC-LR(HRP-MC-LR),并使其与氨基功能化的Ru@SiO2偶联,制得MC-LR-Ru@SiO2。采用直接竞争模式,在标记物MC-LR-Ru@SiO2存在下,以三丙胺作为共反应物,利用电化学发光法(ECL)测定溶液中的微囊藻毒素,免疫反应完成后,电化学发光强度(I)随着MC-LR浓度的增大而减小,且在0.100~100μg/L范围内,电化学发光强度差值(ΔI)与游离的MC-LR浓度的对数呈良好线性关系,检出限为0.007μg/L。对实际水样进行了加标回收实验,回收率为95.5%~105%。 相似文献
987.
Graphene Liquid Marbles as Photothermal Miniature Reactors for Reaction Kinetics Modulation 下载免费PDF全文
Wei Gao Hiang Kwee Lee Dr. Jonathan Hobley Prof. Tianxi Liu Dr. In Yee Phang Prof. Xing Yi Ling 《Angewandte Chemie (International ed. in English)》2015,54(13):3993-3996
We demonstrate the fabrication of graphene liquid marbles as photothermal miniature reactors with precise temperature control for reaction kinetics modulation. Graphene liquid marbles show rapid and highly reproducible photothermal behavior while maintaining their excellent mechanical robustness. By tuning the applied laser power, swift regulation of graphene liquid marble’s surface temperature between 21–135 °C and its encapsulated water temperature between 21–74 °C are demonstrated. The temperature regulation modulates the reaction kinetics in our graphene liquid marble, achieving a 12‐fold superior reaction rate constant for methylene blue degradation than at room temperature. 相似文献
988.
Synthesis of Carbon/Sulfur Nanolaminates by Electrochemical Extraction of Titanium from Ti2SC 下载免费PDF全文
Dr. Meng‐Qiang Zhao Morgane Sedran Zheng Ling Maria R. Lukatskaya Olha Mashtalir Michael Ghidiu Boris Dyatkin Darin J. Tallman Prof. Thierry Djenizian Prof. Michel W. Barsoum Prof. Yury Gogotsi 《Angewandte Chemie (International ed. in English)》2015,54(16):4810-4814
Herein we electrochemically and selectively extract Ti from the MAX phase Ti2SC to form carbon/sulfur (C/S) nanolaminates at room temperature. The products are composed of multi‐layers of C/S flakes, with predominantly amorphous and some graphene‐like structures. Covalent bonding between C and S is observed in the nanolaminates, which render the latter promising candidates as electrode materials for Li‐S batteries. We also show that it is possible to extract Ti from other MAX phases, such as Ti3AlC2 , Ti3SnC2 , and Ti2GeC, suggesting that electrochemical etching can be a powerful method to selectively extract the “M” elements from the MAX phases, to produce “AX” layered structures, that cannot be made otherwise. The latter hold promise for a variety of applications, such as energy storage, catalysis, etc. 相似文献
989.
990.
Tao Wang Dr. Yuzhou Wu Dr. Seah Ling Kuan Oliver Dumele Dr. Markus Lamla Dr. David Y. W. Ng Matthias Arzt Jessica Thomas Jan O. Mueller Prof. Dr. Christopher Barner‐Kowollik Prof. Dr. Tanja Weil 《Chemistry (Weinheim an der Bergstrasse, Germany)》2015,21(1):228-238
A disulfide intercalator toolbox was developed for site‐specific attachment of a broad variety of functional groups to proteins or peptides under mild, physiological conditions. The peptide hormone somatostatin (SST) served as model compound for intercalation into the available disulfide functionalization schemes starting from the intercalator or the reactive SST precursor before or after bioconjugation. A tetrazole–SST derivative was obtained that undergoes photoinduced cycloaddition in mammalian cells, which was monitored by live‐cell imaging. 相似文献