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21.
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
22.
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
23.
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
24.
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
25.
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
26.
Kotaro Honda (2/23/1870–2/12/1954) graduated from the Department of Physics, Tokyo Imperial University in 1897. Between 1907 and 1911, he stayed in Europe, and spent the majority of his time at Göttingen University to study physical metallurgy under Professor Gustav Tammann. In 1911, he returned to Japan and was nominated professor of physics at Tohoku Imperial University, Sendai. An university-affiliated institute for research on iron and steel was established on a permanent basis in 1919, and the institute developed to the Research Institute for Iron, Steel, and Other Metals (RIISOM, KINKEN in Japanese) in 1922. Professor Honda served as the Director of the Institute until 1933. The RIISOM was reorganized as a national collaborative research institute named Institute for Materials Research in 2001. Professor Honda and his colleagues achieved distinguished research works of physical metallurgy, in which thermoanalytical techniques such as differential thermal analysis (DTA), thermodilatometry and thermomagnetometry were utilized effectively. Professor Honda also played an important role in the field of thermogravimetry (TG) by means of the first development of the thermobalance. In the present paper, Honda’s original thermobalance, various modifications carried out by his school, the commercialized Honda’s thermobalance and other related matters are briefly summarized. 相似文献
27.
Hiroshi Konno Yasutoshi Yajima Ayumi Ban 《Computational Optimization and Applications》1994,3(2):181-191
We will propose an algorithm for calculating a minimal sphere containing a polytope defined by a system of linear inequalities in low dimensional Euclidean space. This algorithm is a straightforward application of the algorithm for maximizing a convex quadratic function over a polytope. It will be shown that this algorithm successfully generates a minimal sphere when the dimensions of the underlying space is up to five.International Digital Communication Inc. 相似文献
28.
Makio Iwahashi Yasutoshi Kasahara 《Current Opinion in Colloid & Interface Science》2011,16(5):359-366
This paper discusses the molecular conformations and the liquid structures of triacylglycerols (TGs) and fatty acids in their melts. Three models for liquid state ordering have been proposed for TG melts to date: the smectic liquid crystal model, the nematic liquid crystal model, and the discotic model. To completely resolve the liquid structure of TGs, further research is required. However, some information on the molecular level has been obtained for fatty acids that are relatively simple compounds. The combination of various spectroscopic and thermodynamic measurements revealed that the hydrogen-bonded dimers of fatty acids are units of intermolecular and intramolecular movements in the liquids and in non-polar solvents. The dimers that construct the clusters resemble the smectic liquid crystal and determine the physicochemical properties of the liquid of the fatty acid. Cholesterol stabilizes the clusters, while ethanol destroys them. Self-diffusion and neutron diffraction measurements revealed that two kinds of fatty acids exist in their binary liquid mixture exist as the homodimers composed of same species. 相似文献
29.
Tetsuo Hanaguri Takashi Tsuboi Atsutaka Maeda Yasutoshi Kotaka Jun-ichi Shimoyama Kohji Kishio 《Czechoslovak Journal of Physics》1996,46(Z3):1559-1560
In Bi2Sr2CaCu2Oy under magnetic fields along the c-axis, both the local and the macroscopic magnetization show clear steps indicating the
first order phase transition (FOPT) in the vortex lattice (VL). Local measurements have revealed that the FOPT occurs from
the center of the sample owing to the field inhomogeneity originated from the geometrical effect. The heights of the steps
are strongly suppressed in local measurements by the demagnetization effect. With decreasing temperature, the irreversibility
in the magnetization just below the step begins to increase and is smoothly connected to the second peak at low temperatures. 相似文献
30.