全文获取类型
收费全文 | 300篇 |
免费 | 7篇 |
国内免费 | 7篇 |
专业分类
化学 | 254篇 |
力学 | 1篇 |
数学 | 15篇 |
物理学 | 44篇 |
出版年
2021年 | 1篇 |
2015年 | 5篇 |
2014年 | 6篇 |
2013年 | 18篇 |
2012年 | 8篇 |
2011年 | 14篇 |
2010年 | 8篇 |
2009年 | 7篇 |
2008年 | 9篇 |
2007年 | 19篇 |
2006年 | 18篇 |
2005年 | 22篇 |
2004年 | 21篇 |
2003年 | 12篇 |
2002年 | 19篇 |
2001年 | 4篇 |
2000年 | 4篇 |
1999年 | 6篇 |
1998年 | 4篇 |
1997年 | 4篇 |
1996年 | 1篇 |
1995年 | 3篇 |
1994年 | 1篇 |
1993年 | 2篇 |
1992年 | 2篇 |
1991年 | 6篇 |
1990年 | 4篇 |
1989年 | 5篇 |
1988年 | 3篇 |
1987年 | 4篇 |
1986年 | 2篇 |
1985年 | 6篇 |
1984年 | 9篇 |
1983年 | 3篇 |
1982年 | 10篇 |
1981年 | 7篇 |
1980年 | 5篇 |
1979年 | 5篇 |
1978年 | 3篇 |
1977年 | 3篇 |
1976年 | 3篇 |
1975年 | 3篇 |
1974年 | 3篇 |
1973年 | 3篇 |
1972年 | 4篇 |
1962年 | 2篇 |
1938年 | 1篇 |
1936年 | 2篇 |
排序方式: 共有314条查询结果,搜索用时 15 毫秒
91.
Tamotsu Izumida Ken-Ichi Mitani Kichi-Suke Saito 《Central European Journal of Mathematics》2014,12(11):1615-1623
In this paper, we consider a generalized triangle inequality of the following type: $$\left\| {x_1 + \cdots + x_n } \right\|^p \leqslant \frac{{\left\| {x_1 } \right\|^p }} {{\mu _1 }} + \cdots + \frac{{\left\| {x_2 } \right\|^p }} {{\mu _n }}\left( {for all x_1 , \ldots ,x_n \in X} \right),$$ where (X, ‖·‖) is a normed space, (µ1, ..., µ n ) ∈ ? n and p > 0. By using ψ-direct sums of Banach spaces, we present another approach to characterizations of the above inequality which is given by [Dadipour F., Moslehian M.S., Rassias J.M., Takahasi S.-E., Nonlinear Anal., 2012, 75(2), 735–741]. 相似文献
92.
Pornthep Chivavibul Manabu Enoki Shigeru Konda Yasushi Inada Tamotsu Tomizawa Akira Toda 《Journal of magnetism and magnetic materials》2011,323(3-4):306-310
An important issue in development of electrical steels for core-laminated products is to reduce core loss to improve energy conversion efficiency. This is usually obtained by tailoring the composition, microstructure, and texture of electrical steels themselves. A new technique to reduce core loss in electrical steel has been investigated. This technique involves electroless plating of magnetic thin coating onto the surface of electrical steel. The material system was electroless Ni–Co–P coatings with different thicknesses (1, 5, and 10 μm) deposited onto the surface of commercially available Fe–3% Si electrical steel. Characterization of deposited Ni–Co–P coating was carried out using X-ray diffraction (XRD), scanning electron microscope (SEM), and energy dispersive X-ray (EDX) spectrometer. The deposited Ni–Co–P coatings were amorphous and composed of 56–59% Ni, 32–35% Co, and 8–10% P by mass. The effect of coatings on core loss of the electrical steel was determined using single sheet test. A core loss reduction of 4% maximum was achieved with the Ni–Co–P coating of 1 μm thickness at 400 Hz and 0.3 T. 相似文献
93.
Zeitschrift für Physik A Hadrons and nuclei - Die Änderung des remanenten Magnetismus des Eiseneinkristalls mit der Temperatur wird für seine drei Hauptachsen gemessen. Da dies... 相似文献
94.
95.
The dissociative excitation of HCN and DCN producing CN(B2Σ+) in collision with Ar(3P0,2) was investigated in a flowing afterglow. The Δν = 0, ?1, and ?2 sequences of the CN(BX) violet emission were analyzed by computer simulation, and the vibrational and rotational distributions of the CN(B2Σ+) fragment were obtained. Possible reaction pathways were studied on the basis of a linear surprisal analysis of the observed distributions and their isotope effects. 相似文献
96.
Norio Kobayashi Tamotsu Fujisawa 《Journal of polymer science. Part A, Polymer chemistry》1972,10(11):3165-3171
Polyoxycarbonylsulfenamides (POSA) have been prepared by interfacial polycondensation of bis(oxycarbonylsulfenyl chlorides) with diamines. The polymers obtained ranged in physical form from crystalline solids to resinous materials depending on the kind of both bis(oxycarbonylsulfenyl chlorides) and diamines used. Some of the polymers gave transparent pliable films from chloroform solution. The polymer films decomposed with liberation of carbonyl sulfide on being subjected to ultraviolet radiation. 相似文献
97.
Takashi Komori Nobuhiro Muramatsu Tamotsu Kondo 《Applied biochemistry and biotechnology》1987,14(1):29-36
A novel immobilized-enzyme system that has glucoamylase on the surface of, and glucose oxidase within, polyurea microcapsules
was developed. This system was found to carry out its sequential enzymatic reaction effectively. It was also demonstrated
that the use of microcapsules was useful for this immobilized-enzyme system since a large amount of the second enzyme, glucose
oxidase, was required for the sequential reaction to proceed efficiently. In addition, this system was found helpful for making
the size of reaction batches smaller. 相似文献
98.
99.
Andrew J. Yencha Hiroyasu Kubota Tsutomu Fukuyama Tamotsu Kondow Kozo Kuchitsu 《Journal of Electron Spectroscopy and Related Phenomena》1981,23(3):431-440
The Penning ionization electron spectra (PIES) and ultraviolet photoelectron spectra (UPS) of ammonia and water molecules condensed on a cold metal substrate have been measured using thermal He*(23S, 21S) metastable atoms and He(I) (58.4 nm) photons. The shifts of the observed positions of the PIES peaks relative to those of the UPS peaks in the condensed phase are roughly equal to the corresponding shifts in the gas phase. The relative intensities of the 3a1 and 1e orbital peaks are reversed in the PIES and UPS for both gaseous and condensed ammonia; the origin of this reversal is interpreted as the difference between the interactions with metastable atoms and photons. On the other hand, the relative intensities of the 3a1 orbital peak in the PIES and UPS for condensed water decrease as compared to the gas-phase spectra. This implies participation of the 3a1 orbital of water in the hydrogen bonding. 相似文献
100.
Toshio Sato Masashi Takeuchi Toshiyuki Itoh Masatoshi Kawashima Tamotsu Fujisawa 《Tetrahedron letters》1981,22(19):1817-1820
β-Vinyl-β-propiolactone reacts regio- and stereoselectively with Grignard reagents in the presence of copper(I) catalyst or with diorganocuprates to afford (E)-3-alkenoic acids in high yields. 相似文献