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21.
22.
Hiroyuki Noguchi Toshiyasu Kiyabu Kazuhiro Hasezaki Yasutoshi Noda 《Journal of Physics and Chemistry of Solids》2007,68(1):91-95
Pb- or Sn-doped Bi88Sb12 alloys were prepared by direct melting, quenching, and annealing. The Bi-Sb alloy phase was predominant in all samples. Pb or Sn atoms were distributed almost uniformly in Bi88Sb12, while some segregation was confirmed at the grain boundaries when Pb or Sn was involved heavily. The thermoelectric properties of these doped materials were investigated by measuring the Hall coefficient, electrical resistivity, and Seebeck coefficient between 20 K and 300 K. The Hall and Seebeck coefficients of Pb- or Sn-doped samples were positive at low temperatures, indicating that the doping element acted as an acceptor. Temperatures resulting in positive Hall and Seebeck coefficients further increased with increasing doping amount and with respect to the annealing process. As a result, a large power factor of 1.2 W/mK2 could be obtained in the 3-at% Sn-doped sample at 220 K, with a large positive Seebeck coefficient. 相似文献
23.
The optical absorption and emission induced by electron irradiation of Na+-doped KCl was measured and new absorption and emission bands which decay at the same time constant were found and ascribed to the self-trapped exciton perturbed by Na+ impurity. 相似文献
24.
Takeshi Abe Ningyu Gu Yasutoshi Iriyama Zempachi Ogumi 《Journal of fluorine chemistry》2003,123(2):279-282
For enhancement of lithium-ion transference number, lithium-ion-conductive polymer electrolytes have been prepared from polyethylene oxide (PEO), lithium salt of LiCF3SO3 or LiF, plasticizer of polyethylene glycol dimethylether (PEGDME), and anion receptor of tris(pentafluorophenyl)borane (TPFB). Transport properties of the resultant polymer electrolytes have been studied by AC impedance spectroscopy. As a result, lithium-ion transference number increased with increasing TPFB due to the restriction of anion conduction by the interaction between anion and anion receptor. Effects of anion receptor on transport properties are discussed. 相似文献
25.
K Miyazaki Y Kato T Matsui S Hayashi Y Iriyama T Fukutsuka T Abe Z Ogumi 《Physical chemistry chemical physics : PCCP》2012,14(31):11135-11138
A high proton-conducting phase appears in the composites of zirconium- and titanium-oxide nanoparticles and polyphosphoric acid (HPO(3)). Metal oxide nanoparticles (ZrO(2) and TiO(2)) react with HPO(3) and form composite electrolytes containing pyrophosphates (ZrP(2)O(7) or TiP(2)O(7)) and shortened HPO(3) chains. The ZrO(2)-HPO(3) composite exhibits eleven times higher conductivity than sole HPO(3) at the maximum. A formed layer of shortened HPO(3) chains surrounding the pyrophosphates enhances the proton conductivities of the composite electrolytes and reduces the activation energies for the proton conductivities from 50 to 30 kJ mol(-1). 相似文献
26.
By using polarization-rotated optical feedback from the transverse-electric (TE) mode to the transverse-magnetic (TM) mode,
chaotic oscillations for both polarization modes are excited in a semiconductor laser. We find different correlations between
these chaotic oscillations than those found in previous studies. In this study, the dynamics are strongly dependent on their
radio-frequency (RF) components and they are divided into three RF regions. For low-pass filtered signals lower than the laser
relaxation oscillation, there is an antiphase correlation between the two polarization modes. On the other hand, the two polarization
modes have an in-phase correlation for the RF components of the high-pass filtered signals, which are higher than the relaxation
oscillation. However, no correlations were observed between the two modes for the intermediate RF components that include
the relaxation oscillation frequency. We also perform numerical calculations for the model and obtain good agreement between
the theoretical and experimental results. 相似文献
27.
Yasutoshi Yashiki Seiichi Kouketsu Shinsuke Miyajima Akira Yamada Makoto Konagai 《Journal of Non》2008,354(19-25):2355-2358
The influence of plasma power and substrate temperature on the structure of nanocrystalline germanium carbon thin films was investigated. Films were deposited by the very high frequency plasma chemical vapor deposition technique using hydrogen diluted monomethylgermane (MMG). Plasma power strongly affected the decomposition of hydrogen and MMG. Crystalline volume fraction and bonding states of the atoms in the films depends on plasma power and substrate temperature. FT-IR measurements also revealed that Ge–Hn and CHn bonds are sensitive to these factors. 相似文献
28.
Hiroshi Konno Takahito Kuno Yasutoshi Yajima 《Computational Optimization and Applications》1992,1(2):227-239
We will show that the average number of steps of parametric simplex algorithms for obtaining global minima of rank-one and rank-two bilinear-programming problems are lower-order polynomial functions of the problem size under the standard assumptions on the distribution of the data imposed in the probabilistic analysis of the simplex method. This means that there exist algorithms for some special class of NP-complete problems, whose average number of arithmetics are polynomial order of the problem size. 相似文献
29.
Yoshinori Kamiya Yasutoshi Naito Keishin Mizoguchi 《Journal of Polymer Science.Polymer Physics》1989,27(11):2243-2250
Sorption of He, H2, N2, O2, Ar, CH4, C2H6, and C2H6 in polybutadiene and the dilation of the polymer due to sorption of the gases are investigated over the pressure range 0-50 atm at 25°C. For CO2 the measurements are made at temperatures ranging from 15 to 80°C. Partial molar volumes of the gases in the polymer are determined. The temperature dependence of partial molar volume is discussed on the basis of the data for CO2. The Flory-Huggins interaction parameters of CO2, C2H4, and C2H6 are also estimated. 相似文献
30.
Yoshikata Koga Yasutoshi Kasahara Kasumi Yoshino Keiko Nishikawa 《Journal of solution chemistry》2001,30(10):885-893
Aqueous dimethyl sulfoxide (DMSO) was studied by X-ray diffraction at room temperature. The results indicated that there are three distinct composition regions. In the DMSO-rich region, DMSO molecules retain the same molecular arrangement as in the pure state, while H2O does not show any structural feature. These findings are in the complete agreement with the suggestion by our earlier thermodynamic study on aqueous DMSO.(1) In the H2O-rich region, there is an indication that DMSO molecules exist as small clusters bound mainly by S=O dipole attraction. Hence, hydrophobic CH3 groups point outward from such a cluster and DMSO acts in effect as a hydrophobic solute. This is also consistent with the findings of our earlier thermodynamic study. In the intermediate region, a gradual change in the radial distribution function with composition was observed. 相似文献