全文获取类型
收费全文 | 233篇 |
免费 | 12篇 |
国内免费 | 2篇 |
专业分类
化学 | 158篇 |
晶体学 | 1篇 |
力学 | 8篇 |
物理学 | 80篇 |
出版年
2021年 | 1篇 |
2019年 | 5篇 |
2018年 | 1篇 |
2017年 | 4篇 |
2016年 | 6篇 |
2015年 | 4篇 |
2014年 | 9篇 |
2013年 | 20篇 |
2012年 | 15篇 |
2011年 | 14篇 |
2010年 | 4篇 |
2009年 | 6篇 |
2008年 | 10篇 |
2007年 | 11篇 |
2006年 | 11篇 |
2005年 | 6篇 |
2004年 | 10篇 |
2003年 | 8篇 |
2002年 | 14篇 |
2001年 | 5篇 |
2000年 | 7篇 |
1999年 | 5篇 |
1998年 | 3篇 |
1997年 | 2篇 |
1996年 | 4篇 |
1995年 | 4篇 |
1993年 | 1篇 |
1992年 | 6篇 |
1991年 | 5篇 |
1990年 | 7篇 |
1989年 | 1篇 |
1988年 | 1篇 |
1987年 | 2篇 |
1986年 | 3篇 |
1985年 | 4篇 |
1984年 | 4篇 |
1983年 | 4篇 |
1982年 | 5篇 |
1981年 | 5篇 |
1979年 | 1篇 |
1978年 | 1篇 |
1976年 | 1篇 |
1975年 | 2篇 |
1974年 | 2篇 |
1973年 | 1篇 |
1968年 | 1篇 |
1967年 | 1篇 |
排序方式: 共有247条查询结果,搜索用时 257 毫秒
91.
Masashi Hatanaka 《Chemical physics》2012,392(1):90-95
Non-bonding degenerate systems with disjoint/non-disjoint composite bands are suggested. In these systems, one of the non-bonding bands is disjoint, and another is non-disjoint type. Whereas the Wannier functions in the former bands span no common atoms, the Wannier functions in the latter bands span common atoms. Regardless of the disjoint bands, these systems are predicted to be ferromagnetic due to non-trivial exchange interactions in the non-disjoint bands. The ferromagnetic interactions are supported by DFT calculations. 相似文献
92.
Yumiko Shimura Junya Suzuki Maria Carmelita Z. Kasuya Koji Matsuoka Kenichi Hatanaka 《Helvetica chimica acta》2012,95(1):67-75
Neolacto‐series ganglioside sialylparagloboside (SPG) is a ganglioside species present in various human tissues, and used in many important studies. In this study, four ganglioside analogs, GM3, GD3, SPG, and NeuAc‐Gal‐GlcNAc‐Gal‐GlcNAc‐Gal‐Glc‐Cer, were synthesized by the saccharide‐primer method using MDCK cells and β‐lactoside primer with different aglycons. As compared to former methods for producing SPG, the primer method was rapid and convenient. Moreover, the yield of SPG was much higher than that obtained by former methods. The production of gangliosides with an azido group in the aglycon moiety was also achieved by using MDCK cells. 相似文献
93.
A. Tamii N. Aoi H. Fujita Y. Fujita K. Hatanaka T. Hashimoto T. Kawabata K. Miki M. Itoh T. Itoh M. Kamimura K. Ogata H. J. Ong H. Sakaguchi T. Shima T. Suzuki T. Yamamoto 《Few-Body Systems》2013,54(7-10):1607-1610
The triple α reaction rate in stars is quite important in many astrophysical scenarios including the stellar evolution and carbon synthesis in stars. Recently the non-resonant triple α reaction rate has been reevaluated using a calculation with the continuum-discretized coupled-channels (CDCC) method, which dramatically increased the rate at low temperature compared to the widely-used NACRE compilation. Since the enhancement influences strongly on astrophysical model simulations, we have planned an experiment for drawing conclusion on the non-resonant triple α reaction rate at low temperature by measuring the three-α continuum state in 12C. We report the present situation of the experiment. 相似文献
94.
K. Matsuta Y. Masuda K. Hatanaka S. C. Jeong S. Kawasaki R. Matsumiya M. Mihara Y. Watanabe D. Nishimura Y. Morita K. Asahi T. Adachi J. Martin A. Konaka A. Miller C. Bidinosti T. Dawson L. Lee C. Davis D. Ramsay W. van Oers E. Korkmaz L. Buchman 《Hyperfine Interactions》2013,219(1-3):89-93
Polarized UCNs have been created by selecting only one spin state passing through a magnetized Fe foil. Typical degree of polarization was about 90 %. The polarization relaxation time in the prototype Ramsey cell was $T_1 =1100^{+800}_{-400}(Nd,Pr)-(Tb,Dy,Gd)-(Fe,Co,Al,Cu)-B magnets were heat treated in two different ways and investigated in the temperature range 4.2 to 400 K. After optimal heat treatment intrinsic coercive field i H c?= 1640 and 5040 kA/m for room temperature and 10 K was obtained and the temperature coefficient of remanence α?=??0.01 for temperature range 80 to 375 K was found. On basis of magnetic measurements and 57Fe Mössbauer spectroscopy, the possible reasons for the increase of i H c during multi-step heat treatment are discussed. 相似文献
95.
T Hamada M Morita M Miyakawa R Sugimoto A Hatanaka MC Vestergaard M Takagi 《Journal of the American Chemical Society》2012,134(34):13990-13996
It is important that we understand the physical, chemical, and biological mechanisms that govern the interaction between nanoparticles (NPs) and heterogeneous cellular surfaces because of the possible cytotoxicity of engineered nanomaterials. In this study, we investigated the lateral localization of nano/microparticles within a biomimetic heterogeneous membrane interface using cell-sized two-phase liposomes. We found that lateral heterogeneity in the membrane mediates the partitioning of nano/microparticles in a size-dependent manner: small particles with a diameter of ≤200 nm were localized in an ordered phase, whereas large particles preferred a fluidic disordered phase. This partitioning behavior was verified by temperature-controlled membrane miscibility transition and laser-trapping of associated particles. In terms of the membrane elastic energy, we present a physical model that explains this localization preference of nano/microparticles. The calculated threshold diameter of particles that separates the particle-partitioning phase was 260 nm, which is in close agreement with our observation (200 nm). These findings may lead to a better understanding of the basic mechanisms that underlie the association of nanomaterials within a cell surface. 相似文献
96.
A cavity-resonator-integrated guided-mode resonance filter (CRIGF) has been proposed and investigated in order to realize high-efficiency narrowband reflection with a small aperture. The CRIGF consists of a grating coupler integrated in a cavity resonator constructed by a pair of distributed Bragg reflectors on a thin-film waveguide. This time, orthogonally crossed integration of two CRIGFs was demonstrated in order to obtain polarization-independent reflection spectrum. An SiO2-based device with 10?μm aperture was designed and fabricated for around 850?nm wavelength operation, and narrowband polarization-independent reflection was confirmed experimentally. 相似文献
97.
A glycosphingolipid analogue (12‐azidododecyl β‐lactoside) as a saccharide primer has been shown to be useful for the synthesis of oligosaccharide libraries by mammalian cells. In the present study, CE‐ESI‐MS was employed to elucidate the structure of glycosphingolipid analogues derived from 12‐azidododecyl β‐lactoside (Lac‐C12N3) by mammalian cells. MDCK cells and COLO201 cells were cultured with Lac‐C12N3, and the glycosylated products secreted into the medium were collected and separated into acidic and neutral products by column chromatography. The acidic products could be directly analyzed by CE‐ESI‐MS, while the neutral products were converted to anionic derivatives via a reaction with propiolic acid. With this method, it was possible to analyze both acidic and neutral products glycosylated by MDCK cells and COLO201 cells at high sensitivity. 相似文献
98.
Single-bubble sonoluminescence is generated in concentrated aqueous solutions of LiBr and LiCl. The moving-bubble state, a type of unstable state in which sonoluminescence is still emitted, is observed above the stable-sonoluminescence state similarly to that in aqueous solutions of NaCl and KCl. Luminosity is increased at similar magnitudes for LiBr, LiCl, NaCl and KCl of the same concentration. 相似文献
99.
Electronic absorption bands of conjugated linear carbon chain molecules, namely polyynes H(C≡C)nH (n=5-7), are exploited to devise light-polarizing films applicable to the UV. Laser ablated polyynes are separated in size and dispersed in a film of polyvinyl alcohol (PVA), which is stretched to align the trapped linear polyyne molecules inside. As a nature of the structural anisotropy, transition dipole of the UV absorption for polyyne molecules is in parallel with the molecular axis and the absorption occurs only for the electromagnetic wave having the amplitude of its electric vector along the molecular axis. Aligned and fixed orientationally in the solid PVA film, polyyne molecules act as selective absorbers of one of the polarization components of incident light at particular wavelength. Using a light source of linearly polarized UV light, whose direction of polarization is rotatable, angular dependence of the absorption intensity is investigated for the stretched PVA film containingaligned polyyne molecules and analyzed in terms of an order parameter in the theory of linear dichroism. 相似文献
100.
Y. Tameshige K. Hatanaka K. Sagara M. Dozono K. Fujita E. Ihara T. Kaneda M. Kato T. Kawabata S. Kuroita Y. Maeda H. Matsubara H. Okamura Y. Sakemi K. Sekiguchi Y. Shimizu T. Sugimoto A. Tamii T. Wakasa 《Few-Body Systems》2008,44(1-4):179-181
In our previous measurement of pd radiative capture at E d = 137 and 196?MeV, we found an interesting fact that the measured tensor analyzing powers show the relation A xx ≈ A yy , although calculated A xx and A yy are apparently different, A xx ≠ A yy . The measured A yy agrees fairly well with the 3N calculations, and the measured A xx largely disagrees with calculated A xx . Similar experiments on pd capture have been made at KVI at nearly the same energies of 130–180?MeV. The KVI data also support A xx ≈ A yy relation, but absolute values of A xx and A yy at KVI are about half of RCNP data. Therefore, we made a new experiment of pd capture at E d = 196?MeV. A zz was measured in three different ways, and data analysis is in progress. Preliminary data seem to support our previous data. 相似文献