全文获取类型
收费全文 | 1767篇 |
免费 | 41篇 |
国内免费 | 1篇 |
专业分类
化学 | 1386篇 |
晶体学 | 9篇 |
力学 | 11篇 |
数学 | 99篇 |
物理学 | 304篇 |
出版年
2021年 | 13篇 |
2020年 | 21篇 |
2019年 | 18篇 |
2018年 | 20篇 |
2017年 | 19篇 |
2016年 | 23篇 |
2015年 | 24篇 |
2014年 | 43篇 |
2013年 | 81篇 |
2012年 | 77篇 |
2011年 | 125篇 |
2010年 | 55篇 |
2009年 | 64篇 |
2008年 | 99篇 |
2007年 | 105篇 |
2006年 | 95篇 |
2005年 | 90篇 |
2004年 | 88篇 |
2003年 | 87篇 |
2002年 | 77篇 |
2001年 | 36篇 |
2000年 | 27篇 |
1999年 | 23篇 |
1998年 | 11篇 |
1997年 | 32篇 |
1996年 | 16篇 |
1995年 | 13篇 |
1994年 | 22篇 |
1993年 | 31篇 |
1992年 | 25篇 |
1991年 | 15篇 |
1990年 | 24篇 |
1989年 | 12篇 |
1988年 | 11篇 |
1987年 | 20篇 |
1986年 | 14篇 |
1985年 | 31篇 |
1984年 | 20篇 |
1983年 | 14篇 |
1982年 | 13篇 |
1981年 | 9篇 |
1980年 | 24篇 |
1979年 | 26篇 |
1978年 | 18篇 |
1977年 | 12篇 |
1976年 | 15篇 |
1974年 | 11篇 |
1973年 | 8篇 |
1972年 | 9篇 |
1966年 | 8篇 |
排序方式: 共有1809条查询结果,搜索用时 15 毫秒
91.
Masakazu Kojima 《Mathematical Programming》1975,9(1):257-277
The nonlinear complementarity problem is the problem of finding a point x in the n-dimensional Euclidean space,R n , such that x ? 0, f(x) ? 0 and 〈x,f(x)~ = 0, where f is a nonlinear continuous function fromR n into itself. Many existence theorems for the problem have been established in various ways. The aim of the present paper is to treat them in a unified manner. Eaves's basic theorem of complementarity is generalized, and the generalized theorem is used as a unified framework for several typical existence theorems. 相似文献
92.
A novel method for determination of inorganic oxyanions by electrospray ionization mass spectrometry using dehydration reactions 下载免费PDF全文
Hirochika Kojima Shota Kurihara Yoshito Watanabe Koki Iwamaru Kiichi Sato Kin‐ichi Tsunoda Hiroki Hotta 《Journal of mass spectrometry : JMS》2016,51(2):123-131
Novel methods for the determination of inorganic oxyanions by electrospray (ES) ionization mass spectrometry have been developed using dehydration reactions between oxyanions and carboxylic acids at the ES interface. Twelve oxyanions (VO3?, CrO42?, MoO42?, WO42?, BO33?, SiO32?, SiO44?, AsO44?, AsO2?, SeO42?, SeO32? and NO2?), out of 16 tested, reacted with at least one of four aminopolycarboxylic acids, i.e. iminodiacetic acid (IDA), nitrilotriacetic acid (NTA), trans‐1,2‐diaminocyclohexane‐N,N,N′,N′‐tetraacetic acid and triethylenetetramine‐N,N,N′,N″,N′″,N′″‐hexaacetic acid, at the ES interface to produce the dehydration products that gave intense mass ion responses, sufficient for trace analysis. As examples, trace determinations of CrVI and silica in water samples were achieved after online ion exchange chromatography, where the dehydration product of CrO42? and NTA (m/z 290) and that of SiO44? and IDA (m/z 192) were measured. The limits of detection of the respective methods were 17 nM (0.83 ng Cr/ml) for CrVI and 0.17 μM (4.8 ng Si/mL) for SiO44?. Copyright © 2016 John Wiley & Sons, Ltd. 相似文献
93.
94.
Bungo Ochiai Haruka Kojima Takeshi Endo 《Journal of polymer science. Part A, Polymer chemistry》2014,52(8):1113-1118
Polyhydroxyurethane bearing silicone backbone was prepared by polyaddition of silicone diamines with a bifunctional five‐membered cyclic carbonate prepared from the corresponding diepoxide and CO2. Polymerization in propylene glycol methyl ether acetate proceeded smoothly, and polymers could be obtained in high yields under appropriate conditions. The introduced silicone moieties improved the hydrophobicity and lowered the glass transition temperature keeping thermal stability. © 2014 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2014 , 52, 1113–1118 相似文献
95.
Sekimoto Shun Tatenuma Katsuyoshi Suzuki Yumi Tsuguchi Akira Tanaka Atsushi Tadokoro Takahiro Kani Yuko Morikawa Yasumasa Yamamoto Asaki Ohtsuki Tsutomu 《Journal of Radioanalytical and Nuclear Chemistry》2017,311(2):1361-1366
The medical radionuclide 99Mo was produced by the 100Mo(γ,n) reaction using bremsstrahlung photons generated by an electron linear accelerator. The amount of 99Mo produced was compared to that predicted by calculation using the particles and heavy ion transport code system. From the 99Mo produced, highly pure 99mTc was separated using the so-called technetium master milker, and the chemical yield of 99mTc was 83–99 %. The installation of a new complex using this method and the electron linear accelerator with the preferable specification was suggested, and a possibility to supply the demand of 99mTc was discussed and shown.
相似文献96.
Yusuke Nakajima Takeshi Kawano Yusuke Taki Chie Kojima 《Research on Chemical Intermediates》2018,44(8):4745-4754
Collagen is a major component of the extracellular matrix, and collagen gels have been used as cell scaffolds. We previously prepared gold nanoparticle (AuNP)-embedded collagen gels (AuCol) to serve as cell scaffolds that were sensitive to visible light. We performed single cell detachment from this cell scaffold using a microscope equipped with a laser irradiation system. In the present study, we adjusted hydrogel thickness and AuNP concentration in AuCol, with a goal of improving cell detachment efficiency. Thin hydrogels became blackened after the laser irradiation, and thick hydrogels with high AuNP concentrations were not permeable to the laser light. We, therefore, prepared bilayer gels, composed of AuCol as the upper layer and intact collagen gel (Col) as the bottom layer. These bilayer gels allowed more effective cell detachment, because they were thick and optically transparent. Our results indicated that an AuCol/Col ratio of 2 enabled the highest cell detachment efficiency. Essentially, no cell damage was observed in our system, suggesting that this is a cell-friendly single cell separation system. 相似文献
97.
Inside Back Cover: Plasmon‐Assisted Water Splitting Using Two Sides of the Same SrTiO3 Single‐Crystal Substrate: Conversion of Visible Light to Chemical Energy (Angew. Chem. Int. Ed. 39/2014) 下载免费PDF全文
98.
99.
Kentaro Okuma Kazuki Kojima Kosei Shioji 《Phosphorus, sulfur, and silicon and the related elements》2013,188(1):583-586
Reactions of selenobenzophenones with methyl propiolate afforded two types of cycloadducts regioselectively. The reaction with tetracyanoethylene gave selenophene derivatives. Mechanisms of these reactions were discussed. 相似文献
100.