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Search Results: 1 - 10 of 150011 matches for " H. Sugawara "
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Abrupt Emergence of Pressure-Induced Superconductivity of 34 K in SrFe2As2: A Resistivity Study under Pressure
H. Kotegawa,H. Sugawara,H. Tou
Physics , 2008, DOI: 10.1143/JPSJ.78.013709
Abstract: We report resistivity measurement under pressure in single crystals of SrFe_2As_2, which is one of the parent materials of Fe-based superconductors. The structural and antiferromagnetic (AFM) transition of T_0 = 198 K at ambient pressure is suppressed under pressure, and the ordered phase disappears above P_c ~ 3.6-3.7 GPa. Superconductivity with a sharp transition appears accompanied by the suppression of the AFM state. T_c exhibits a maximum of 34.1 K, which is realized close to the phase boundary at P_c. This T_c is the highest among those of the stoichiometric Fe-based superconductors.
Coverage of genomic medicine: information gap between lay public and scientists
Sugawara Y, Narimatsu H, Fukao A
Risk Management and Healthcare Policy , 2012, DOI: http://dx.doi.org/10.2147/RMHP.S33661
Abstract: verage of genomic medicine: information gap between lay public and scientists Original Research (1713) Total Article Views Authors: Sugawara Y, Narimatsu H, Fukao A Published Date August 2012 Volume 2012:5 Pages 83 - 90 DOI: http://dx.doi.org/10.2147/RMHP.S33661 Received: 06 May 2012 Accepted: 13 June 2012 Published: 02 August 2012 Yuya Sugawara,1 Hiroto Narimatsu,2,3 Akira Fukao2,3 1Department of Medical Informatics, Graduate School of Medical Science, Yamagata University, Yamagata, 2Advanced Molecular Epidemiology Research Institute, Faculty of Medicine, Yamagata University, Yamagata, 3Department of Public Health, Yamagata University Graduate School of Medicine, Yamagata, Japan Abstract: The sharing of information between the lay public and medical professionals is crucial to the conduct of personalized medicine using genomic information in the near future. Mass media, such as newspapers, can play an important role in disseminating scientific information. However, studies on the role of newspaper coverage of genome-related articles are highly limited. We investigated the coverage of genomic medicine in five major Japanese newspapers (Asahi, Mainichi, Yomiuri, Sankei, and Nikkei) using Nikkei Telecom and articles in scientific journals in PubMed from 1995 to 2009. The number of genome-related articles in all five newspapers temporarily increased in 2000, and began continuously decreasing thereafter from 2001 to 2009. Conversely, there was a continuous increasing trend in the number of genome-related articles in PubMed during this period. The numbers of genome-related articles among the five major newspapers from 1995 to 2009 were significantly different (P = 0.002). Commentaries, research articles, and articles about companies were the most frequent in 2001 and 2003, when the number of genome-related articles transiently increased in the five newspapers. This study highlights the significant gap between newspaper coverage and scientific articles in scientific journals.
Coverage of genomic medicine: information gap between lay public and scientists
Sugawara Y,Narimatsu H,Fukao A
Risk Management and Healthcare Policy , 2012,
Abstract: Yuya Sugawara,1 Hiroto Narimatsu,2,3 Akira Fukao2,31Department of Medical Informatics, Graduate School of Medical Science, Yamagata University, Yamagata, 2Advanced Molecular Epidemiology Research Institute, Faculty of Medicine, Yamagata University, Yamagata, 3Department of Public Health, Yamagata University Graduate School of Medicine, Yamagata, JapanAbstract: The sharing of information between the lay public and medical professionals is crucial to the conduct of personalized medicine using genomic information in the near future. Mass media, such as newspapers, can play an important role in disseminating scientific information. However, studies on the role of newspaper coverage of genome-related articles are highly limited. We investigated the coverage of genomic medicine in five major Japanese newspapers (Asahi, Mainichi, Yomiuri, Sankei, and Nikkei) using Nikkei Telecom and articles in scientific journals in PubMed from 1995 to 2009. The number of genome-related articles in all five newspapers temporarily increased in 2000, and began continuously decreasing thereafter from 2001 to 2009. Conversely, there was a continuous increasing trend in the number of genome-related articles in PubMed during this period. The numbers of genome-related articles among the five major newspapers from 1995 to 2009 were significantly different (P = 0.002). Commentaries, research articles, and articles about companies were the most frequent in 2001 and 2003, when the number of genome-related articles transiently increased in the five newspapers. This study highlights the significant gap between newspaper coverage and scientific articles in scientific journals.Keywords: coverage, personalized medicine, mass media, newspaper
Effect of Uniaxial Stress for Pressure-Induced Superconductor SrFe_2As_2
H. Kotegawa,T. Kawazoe,H. Sugawara,K. Murata,H. Tou
Physics , 2009, DOI: 10.1143/JPSJ.78.083702
Abstract: We report that the pressure-temperature phase diagram of single-crystalline SrFe$_2$As$_2$ is easily affected by the hydrostaticity of a pressure-transmitting medium. For all of the three mediums we used, superconductivity with zero resistance appears, accompanied by the suppression of an antiferromagnetic (orthorhombic) phase, but the critical pressure $P_c$ was found to depend on the type of medium. $P_c$ was estimated to be 4.4 GPa under almost hydrostatic condition, but it decreased to $3.4-3.7$ GPa with the use of the medium already solidified at room temperature. The uniaxial stress along the c-axis is suggested to aid in the suppression of the antiferromagnetic (orthorhombic) phase. The pressure effect of BaFe$_2$As$_2$ is also reported.
Novel features in the flux-flow resistivity of the heavy fermion superconductor PrOs$_{4}$Sb$_{12}$
M. Kobayashi,H. Sato,H. Sugawara,H. Fujiwara,Y. Aoki
Physics , 2005, DOI: 10.1143/JPSJ.74.1690
Abstract: We have investigated the electrical resistivity of the heavy fermion superconductor PrOs$_{4}$Sb$_{12}$ in the mixed state. We found unusual double minima in the flux-flow resistivity as a function of magnetic field below the upper critical field for the first time, indicating double peaks in the pinning force density ($F_{\rm P}$). Estimated $F_{\rm P}$ at the peak exhibits apparent dependence on applied field direction; composed of two-fold and four-fold symmetries mimicking the reported angular dependence of thermal conductivity ($\kappa$). The result is discussed in correlation with the double step superconducting (SC) transition in the specific heat and the multiple SC-phases inferred from the angular dependence of $\kappa$.
On the Symmetry of Low-Field Ordered Phase of PrFe4P12 : 31P NMR
J. Kikuchi,M. Takigawa,H. Sugawara,H. Sato
Physics , 2007, DOI: 10.1143/JPSJ.76.043705
Abstract: We have performed 31P nuclear magnetic resonance (NMR) experiments on the filled skutterudite compound PrFe4P12 to investigate the exotic ordered phase at low temperatures and low magnetic fields. Analysis of the NMR line splitting in the ordered phase indicates that totally symmetric (\Gamma_1-type) staggered magnetic multipoles are induced by magnetic fields. This is incompatible with any type of quadrupole order at zero field. We conclude that the ordered phase has broken translational symmetry with the wave vector Q=(1,0,0) but the Th point symmetry at the Pr sites is not broken by the non-magnetic \Gamma_1-type order parameter.
Evidence for s-wave superconductivity with antiferromagnetic fluctuations in filled skutterudite LaFe$_{4}$P$_{12}$: $^{139}$La and $^{31}$P-NMR studies
Y. Nakai,K. Ishida,D. Kikuchi,H. Sugawara,H. Sato
Physics , 2005, DOI: 10.1143/JPSJ.74.3370
Abstract: We have performed $^{139}$La,$^{31}$P-NMR studies on a filled skutterudite superconductor LaFe$_{4}$P$_{12}$ with a critical temperature $T_c=4.1$ K. In the normal state, the presence of antiferromagnetic (AFM) fluctuations at finite wave vectors is suggested from the relation between the nuclear spin-lattice relaxation rate $1/T_1$ and the Knight shift. In the superconducting (SC) state, the distinct coherence peak was observed just below $T_c$, and is easily suppressed by the applied field. An exponential decrease of $1/T_1$ was observed, suggestive of the isotropic superconducting gap with $2\Delta/k_{\rm B}T_c =3.8$. Besides, we observed the decrease of the Knight shift, indicative of the singlet-pair formation below $T_c$. These results are clear evidence that LaFe$_{4}$P$_{12}$ is a rare s-wave superconductor with significant AFM fluctuations.
Magnetic Phase Diagram of the Heavy-Fermion Superconductor PrOs4Sb12
T. Tayama,T. Sakakibara,H. Sugawara,Y. Aoki,H. Sato
Physics , 2003, DOI: 10.1016/j.jmmm.2003.12.710
Abstract: We investigated the magnetic phase diagram of the first Pr-based heavy fermion superconductor PrOs4Sb12 by means of high-resolution dc magnetization measurements in low temperatures down to 0.06K. The temperature dependence of the magnetization M(T) at 0.1kOe exhibits two distinct anomalies at Tc1=1.83K and Tc2=1.65K, in agreement with the specific heat measurements at zero field. Increasing magnetic field H, both Tc1(H) and Tc2(H) move toward lower temperatures without showing a tendency of intersecting to each other. Above 10kOe, the transition at Tc2(H) appears to merge into a line of the peak effect which is observed near the upper critical field Hc2 in the isothermal M(H) curves, suggesting a common origin for these two phenomena. The presence of the field-induced ordered phase (called phase A here) is confirmed for three principal directions above 40kOe, with the anisotropic A-phase transition temperature TA: TA[100] > TA[111] >TA[110]. The present results are discussed on the basis of crystalline-electrical-field level schemes with a non-magnetic ground state, with emphasis on a Gamma1 singlet as the possible ground state of Pr3+ in PrOs4Sb12.
Sensory Evaluation Spectrum Method as a Descriptive Sensory Analysis  [PDF]
Yoshie Yamagata, Yoshiaki Sugawara
Psychology (PSYCH) , 2014, DOI: 10.4236/psych.2014.514170
Abstract: Sensory evaluation is used to measure consciousness, and primarily developed in experimental and mathematical psychology. Sensory experiences can be reported using verbal (semantic) methods. This paper presents an overview of our semantic research achievements over the past decade, focusing on methodological attempts for substantiating the measure as a descriptive sensory analysis. Two types of studies that deserve particular attention are detailed: 1) evaluation of the efficacy of photo catalytic elimination of stains or bio-aerosols in air using TiO2 and photo catalytic deodorizing properties of a TiO2-type deodorizer; and 2) evaluation of the differential discrimination of perceived odor quality for a given aroma while inhaling the fragrances of essential oils. Both studies are based on semantic responses of participants. The perceived sensory attributes in the participants can be represented by a sensory spectrum: a bar graph whereby the mean of the impressions is plotted against the setting semantic impression descriptors. In the former study, we provide a background on the sensory evaluation spectrum method and discuss its implementation as a measure of descriptive sensory analysis. The latter study additionally demonstrates how statistical defects were overcome when spectra were not statistically significant.
Preparation and Optical Patterning of Organic-Inorganic Hybrid Color-Filter Films Using Latent Pigments by Utilizing Photo-Acid-Generator and Microwave Irradiation  [PDF]
T. Ohishi, S. Sugawara
Materials Sciences and Applications (MSA) , 2014, DOI: 10.4236/msa.2014.514111
Abstract: Preparation and photo-patterning characteristics of organic-inorganic hybrid thin film containing latent pigment by using photo-acid-generator (PAG) and microwave irradiation have been investigated. The acrylic thin film modified with methoxysilane containing PAG was formed on a glass substrate and irradiated with ultraviolet rays to promote sol-gel reaction by catalytic action of acid which was generated from PAG. And then the film was hardened with microwave irradiation, yielding organic-inorganic hybrid polymer film having hardness, highly transparency and strong adhesion with a glass substrate. Since this reaction only occurred in the optically (UV) irradiated regions, by exploiting the difference between the adhesivenesses of these regions photo-irradiated through photomask with a glass substrate, it was possible to form a patterned film with pitch of 100 to 50 μm by a simple lift-off method. A pigment-containing film using latent pigments (with subtractive three primary colors of coloring materials) and a patterned film were prepared, and it was possible to make these films multi-colored by varying the mixing ratio of the pigments. This multi-colored film-preparation method is effective for simply and efficiently forming a color-filter film by applying optical and microwave irradiation.
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