全文获取类型
收费全文 | 1248篇 |
免费 | 44篇 |
国内免费 | 3篇 |
专业分类
化学 | 838篇 |
晶体学 | 17篇 |
力学 | 27篇 |
数学 | 129篇 |
物理学 | 284篇 |
出版年
2023年 | 9篇 |
2022年 | 6篇 |
2021年 | 18篇 |
2020年 | 20篇 |
2019年 | 23篇 |
2018年 | 25篇 |
2017年 | 23篇 |
2016年 | 32篇 |
2015年 | 34篇 |
2014年 | 35篇 |
2013年 | 64篇 |
2012年 | 71篇 |
2011年 | 82篇 |
2010年 | 43篇 |
2009年 | 42篇 |
2008年 | 71篇 |
2007年 | 49篇 |
2006年 | 49篇 |
2005年 | 68篇 |
2004年 | 54篇 |
2003年 | 40篇 |
2002年 | 51篇 |
2001年 | 32篇 |
2000年 | 26篇 |
1999年 | 13篇 |
1998年 | 17篇 |
1997年 | 10篇 |
1996年 | 15篇 |
1995年 | 18篇 |
1994年 | 11篇 |
1993年 | 12篇 |
1992年 | 18篇 |
1991年 | 11篇 |
1990年 | 14篇 |
1989年 | 15篇 |
1988年 | 17篇 |
1987年 | 13篇 |
1986年 | 14篇 |
1985年 | 9篇 |
1984年 | 10篇 |
1983年 | 11篇 |
1982年 | 11篇 |
1981年 | 5篇 |
1980年 | 10篇 |
1979年 | 10篇 |
1978年 | 6篇 |
1977年 | 6篇 |
1976年 | 11篇 |
1975年 | 10篇 |
1974年 | 6篇 |
排序方式: 共有1295条查询结果,搜索用时 15 毫秒
81.
82.
Properties of In situ polymerized poly(3,4‐ethylenedioxythiophene)/alumina composites for energy storage applications 下载免费PDF全文
Mari Cruz G. Saborío Francesc Estrany Carlos Alemán 《Journal of Polymer Science.Polymer Physics》2017,55(15):1131-1141
Composites formed by poly(3,4‐ethylenedioxythiophene) and alumina (PEDOT/Al2O3) have been prepared by in situ anodic polymerization. For this purpose, the stability of 1:1 and 4:1 monomer:alumina aqueous solutions has been examined as a function of the pH (2.3, 4.0, 7.0, 8.8, or 10.8). Results indicate that the monomer behaves as a dispersant that remains stable at the studied basic pHs despite they are close to the isoelectric point of alumina. Although the thermal stability of the composites is considerably affected by the pH of the reaction medium, its influence on the surface morphology is very small. Independently, of the synthetic conditions, the electrochemical properties were better for PEDOT/Al2O3 than for pure PEDOT, reflecting that alumina particles promote the charge mobility. The highest specific capacitance (SC; 141 F/g), which was 55% higher than that obtained for pure PEDOT, was achieved for the composite prepared at pH = 8.8 using a 4:1 monomer:alumina ratio. These conditions favor the participation of OH– groups as secondary doping agents without degrading the polymer matrix and enhance the specific surface of the films, facilitating the ionic mobility. On the other hand, application of a multi‐step polymerization strategy has shown that interfaces originated by consecutive steps enhance the SC. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2017 , 55, 1131–1141 相似文献
83.
Masahiro Yamashita Daisuke Kawakami Satoshi Matsunaga Yoshio Nakayama Mari Sasaki Shinya Takaishi Fumiyasu Iwahori Hitoshi Miyasaka Ken‐ichi Sugiura Yoshiki Wada Hiroshi Miyamae Hiroyuki Matsuzaki Hiroshi Okamoto Hisaaki Tanaka Kazuhiro Marumoto Shin‐ichi Kuroda 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2004,116(36):4867-4871
84.
Mihai Mari 《Journal de Mathématiques Pures et Appliquées》2002,81(12):109-1239
We are interested in the existence of travelling-waves for the nonlinear Schrödinger equation in RN with “ψ3−ψ5”-type nonlinearity. First, we prove an abstract result in critical point theory (a local variant of the classical saddle-point theorem). Using this result, we get the existence of travelling-waves moving with sufficiently small velocity in space dimension N4. 相似文献
85.
We have developed a new sample injection method for capillary electrophoresis (CE) that reduces the required migration time. We demonstrated a pressurization technique that was performed with buffer in the outlet after the electrokinetic sample injection with no buffer in the outlet. To reduce the migration time, the sample injection had to be performed with no buffer in the outlet; water should be pressurized while the buffer is in the outlet. Though the resolution was slightly decreased using this method, the addition of a separation carrier (curdlan) to the run buffer restored the resolution without delaying the migration time. The use of our new sample injection method combined with our high-quality separation carrier will enable us to improve the efficiency of the high-throughput screening (HTS) system for proteome analysis. 相似文献
86.
Watanabe S Sonobe M Arai M Tazume Y Matsuo T Nakamura T Yoshida K 《Chemical communications (Cambridge, England)》2002,(23):2866-2867
A gold nanoparticle surface-modified with amide ligands shows enhanced optical sensing of anions: the detection limit is increased by about three orders of magnitude higher than that originally expected from the anion binding ability of neutral amide ligands. 相似文献
87.
88.
89.
The possibility of coexistence of spherical and deformed states in samarium isotopes is explored by analyzing the experimental data of the two-neutron transfer reactions, and the moment of mixing of the coexisting states and their deformation parameters are determined. 相似文献
90.