Search Results - (Author, Cooperation:K. Yoshino)

2018-02-07

Wiley-Blackwell

0007-0963

1365-2133

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2012-06-23

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0036-8075

1095-9203

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Actin Cytoskeleton/*physiology/ultrastructure ; Actins/*metabolism ; Cell Membrane/metabolism/ultrastructure ; Diffusion ; Fungal Proteins/chemistry/genetics/*metabolism ; Magnaporthe/genetics/*pathogenicity/physiology/ultrastructure ; Microfilament Proteins/metabolism ; Mutation ; Oryza/*microbiology ; Phosphatidylinositols/metabolism ; Plant Diseases/*microbiology ; Plant Leaves/microbiology ; Protein Interaction Domains and Motifs ; Recombinant Fusion Proteins/metabolism ; Septins/*chemistry/genetics/*metabolism ; cdc42 GTP-Binding Protein/metabolism

2018-02-22

Institute of Physics Publishing (IOP)

1748-0221

Physics

1089-7690

AIP Digital Archive

Physics

Chemistry and Pharmacology

A nonlinear least-squares method of retrieving predissociation linewidths from the experimental absolute absorption cross sections of Yoshino et al. [Planet. Space Sci. 31, 339 (1983)] has been applied to the (1,0)–(12,0) Schumann–Runge bands of oxygen. Predissociation linewidths deduced for the Schumann–Runge bands are larger than the theoretical predictions of Julienne [J. Mol. Spectrosc. 63, 60 (1976)] and the latest measurements of Lewis et al. [J. Quant. Spectrosc. Radiat. Transfer 36, 187 (1986)]. The larger linewidths found will have an impact on calculations of solar flux penetration into the Earth's atmosphere and of the photodissociation rates of trace species in the upper atmosphere. Systematic variation of predissociation linewidths with rotational quantum number is observed in the bands (v',0) with v'=6, 8, 9, 11, and 12.

Electronic Resource

1089-7690

AIP Digital Archive

Physics

Chemistry and Pharmacology

Electronic Resource

1089-7690

AIP Digital Archive

Physics

Chemistry and Pharmacology

Photoabsorption cross sections for seven electric dipole-allowed N2 bands, at wavelengths between 95.8 and 99.4 nm, have been measured with an instrumental resolution of 6.2×10−4 nm. Integrated cross sections and band oscillator strengths are presented for the c4' 1Σu+(v'=0)–X 1Σg'(v ‘=0) and c3 1Πu(v'=0)–X 1Σg+(v‘=0) transitions, as well as for five bands (v'=0,1,2,3,4) in the b 1Πu(v')–X 1Σg+(0) progression. The results are compared with earlier, lower resolution absorption measurements, electron scattering measurements, and calculations based on a deperturbation analysis of the excited states.

Electronic Resource

1089-7550

AIP Digital Archive

Physics

Optical properties of conducting polymers with Si atoms in main chains, such as optical absorption, photoluminescence (PL), and electroluminescence (EL), have been studied. The electronic energy structures have been determined by optical and electrochemical measurements. The strong PL with high quantum efficiency has been clarified, and spectral narrowing has been observed by pulse excitation of a nitrogen laser. Intense blue or red EL has also been demonstrated and the emission efficiency has been improved by anode surface modification and annealing. © 2001 American Institute of Physics.

Electronic Resource

1089-7690

AIP Digital Archive

Physics

Chemistry and Pharmacology

The predissociation linewidths and level shifts of vibrational levels of three oxygen isotopic molecules 16O2, 16O18O, and 18O2 arising from the interactions of the B 3Σ−u state with the four repulsive states 5Πu, 3Σ+u, 3Πu, and 1Πu, have been calculated. A set of parameters characterizing these interactions has been determined. Good agreement between calculated and experimental predissociation widths and shifts has been obtained for all the three isotopic molecules.

Electronic Resource

1089-7690

AIP Digital Archive

Physics

Chemistry and Pharmacology

Predissociation linewidths of the (3,0)–(11,0) Schumman–Runge bands of 18O2 and 16O 18O in the wavelength region 180–196 nm have been obtained from the published measurements of the absolute absorption cross sections of Yoshino et al. [Planet. Space Sci. 36, 1201 (1988); 37, 419 (1989)] and spectroscopic constants of these molecules of Cheung et al. [J. Mol. Spectrosc. 131, 96 (1988); 134, 362 (1989)]. The linewidths are determined as parameters in the nonlinear least-squares fitting of calculated to measured cross sections. Predissociation maxima are found at upper vibrational levels with v'=4, 7, and 10 for 18O2 and for 16O 18O. Our predissociation linewidths are mostly greater than previous experimental values for both isotopic molecules.

Electronic Resource

1089-7690

AIP Digital Archive

Physics

Chemistry and Pharmacology

The predissociation linewidths of vibrational levels v=0 –12 for 16O2, 16O18O, and 18O2 molecules in the B 3Σu− state with rotational quantum numbers N≤20 have been calculated taking into account the spin–orbit interactions of the B 3Σu− state with the 5Πu, 3Σu+, 3Πu, and 1Πu states, and the rotational coupling with the 3Πu state. The predissociation linewidths exhibit systematic variations with rotational quantum number for different vibrational levels. Good agreement between most of the calculated and experimental linewidths has been obtained for all three isotopic molecules, with the exception of the set of linewidths of 16O2 for v=0 and 2. The agreement can be improved by adjustment of the 1Πu potential and the strength of the spin–orbit interaction between the B 3Σu− and 1Πu states.

Electronic Resource

1089-7550

AIP Digital Archive

Physics

The optical reflection, electrical conductivity, and magnetoconductance of porous opal carbon replicas which have a periodic nanoscale structure have been studied. The temperature dependence of resistivity in green opal carbon replica is different from that in red opal carbon replica. The electrical properties of replica heat treated up to 3000 °C are consistent with those of pyrolitic graphite. The periodicity is found to decrease with this heat treatment by scanning electron microscopy and reflection measurements. Due to alkali metal doping, optical reflection spectra of replica with a heat treatment temperature of 2800 °C have changed drastically. The occurrence of positive magnetoconductance indicates the existence of quantum effect at low temperature. These results indicate that the electrical and optical properties can be controlled by pyrolysis technique and porous graphite can be obtained. © 2000 American Institute of Physics.

Electronic Resource

1089-7550

AIP Digital Archive

Physics

The electrical and electrochemical characteristics of pyrolized fly ash which has a porous structure have been investigated for use as an electrode active material in rechargeable batteries. The electrodes of pyrolized fly ash show good stability and high Coulombic efficiency in charge–discharge cycles in LiClO4/PC. The charge–discharge capacity of pyrolized fly ash with a heat treatment temperature of 1100 °C is as high as 205 mA h/g. From the viewpoint of recycling of industrial waste, we propose to use fly ash as a negative electrode in a lithium ion secondary battery. © 2000 American Institute of Physics.

Electronic Resource

1089-7550

AIP Digital Archive

Physics

The nematic liquid-crystal director-orientation in the vicinity of the interface between a liquid-crystal layer and a glass substrate is evaluated in various orientations under an applied electric field, using shear horizontal (SH) wave propagation. The measured acoustic phase delay is related to numerical analysis of the propagation characteristics of the SH wave in a trilayer structure containing a nematic liquid-crystal layer (4-cyano-4′-pentylbiphenyl: 5CB) between two glass plates. This technique using SH wave propagation in a liquid-crystal cell is promising for evaluating the nematic liquid-crystal director angle in the vicinity of the interface. © 2002 American Institute of Physics.

Electronic Resource

1089-7623

AIP Digital Archive

Physics

Electrical Engineering, Measurement and Control Technology

Current research on the Earth's upper atmosphere requires molecular parameters of unprecedented detail and accuracy. For example, state-of-the-art models of the vacuum-ultraviolet (VUV) absorbing properties of the atmosphere call for absorption cross sections with details on the scale of the Doppler linewidths. As a consequence, spectroscopic data at resolving powers of the order of 106 are needed. Current particular needs are for ultra-high-resolution absorption cross-section data for some bands of NO and O2 in the 170–185 nm spectral region. To meet these requirements, an existing, portable, VUV Fourier-transform (FT) spectrometer will be moved to a synchrotron-radiation facility (Photon Factory, KEK, Japan) and VUV photoabsorption cross sections of NO and O2 will be measured. It has been demonstrated so far with emission line sources that the FT spectrometer will perform to ≤139 nm. Extension of work on absorption measurements to shorter wavelengths and with ultrahigh resolution requires an improved light source. Synchrotron radiation from a storage ring facility is the best alternative. © 1995 American Institute of Physics.

Electronic Resource

1077-3118

AIP Digital Archive

Physics

GaAs quantum wires of a new type are fabricated on {1¯10} crystallographic facets perpendicular to the (1¯1¯1¯)B substrates by selective area growth using metalorganic chemical vapor deposition. First, rectangular-shaped AlGaAs layers are grown on a SiO2 stripe-masked GaAs (1¯1¯1¯)B substrate at a high growth temperature. Next, n-AlGaAs/GaAs modulation-doped structures are laterally grown on {1¯10} sidewalls at a low growth temperature. The channel width of the one-dimensional electron gas can be exactly controlled by the thickness of the first rectangular AlGaAs layer. The existence of the quasi-one-dimensional electron gas on {1¯10} sidewalls is confirmed by the orientation dependence of the Shubnikov-de Hass oscillations. The advantage of this quantum wire structure is that there is no size fluctuation which is usually present when dry etching processes are used. Other applications of this selective growth on masked substrates, such as lateral superlattices, are also discussed.

Electronic Resource

1077-3118

AIP Digital Archive

Physics

Phase coherence length Lφ of on-facet quantum wires is determined at temperatures down to 50 mK by three methods: magnetoresistance, conductance fluctuation amplitude, and the conductance fluctuation correlation field. It is found that Lφ saturates below about 0.4 K. This saturation is identified as due to spin-orbit interaction, which has no temperature dependence. This result is supported by positive magnetoresistance under a weak magnetic field.

Electronic Resource

1089-7550

AIP Digital Archive

Physics

Comparative study of optical properties of alkylthio-group-substituted phthalocyanine rare-earth metal sandwich complexes ([(CnS)8Pc]2M,M=Eu,Lu,Tb) is presented. Photoluminescence and photoconductivity of [(CnS)8Pc]2M complex is very weak. Two photoluminescence bands were observed at around 400–650 and 720–800 nm in chloroform solution corresponding to the Soret and Q bands in the absorption spectra, respectively. However, the emission from Eu3+ ion (as well as Tb3+) was not found compared with other Eu complexes because the 5d levels of the Eu3+ ion lie higher than the triplet level of the ligand. The significant enhancement of the photoconductivity of [(C16S)8Pc]2M after C60 doping is reported. The photoconductivity is positive at the low electric field in the ohmic regime while it becomes negative at the high electric field upon photoexcitation with strongly absorbed light. The negative photoconductivity is attributed to space-charge effects. The mechanism of photoluminescence and photoconductivity are discussed by taking the electronic energy schemes of phthalocyanine ligands and lanthanide ion and C60 into consideration. © 2000 American Institute of Physics.

Electronic Resource

1089-7550

AIP Digital Archive

Physics

A new method for the estimation of rotational viscosity of ferroelectric liquid crystals using transient light scattering (TSM) is reported. The relation between rotational viscosity, spontaneous polarization, and dielectric dispersion frequency is studied as a function of the racemization. The rotational viscosity is almost independent of spontaneous polarization and there is no obvious correlation between rotational viscosity and dispersion frequency. The dispersion frequency is confirmed to be inversely proportional to the square of the helical pitch. The rotational viscosity calculated from this relation is consistent with that from the new TSM method.

Electronic Resource

1089-7550

AIP Digital Archive

Physics

Cycle life, stability, and switching characteristics of a color switching device utilizing a conducting polymer, polythiophene film in an electrochemical cell are studied. Cycle life of more than 5×105 times has been achieved by operation with an appropriate rectangular voltage application in an electrolyte of Pb(ClO4)2/acetonitrile. A chronoabsorptometric measurement is carried out to inspect the kinetics of electrochemical cycle. The diffusion of charged species in the film is found to control the switching time and its constant is evaluated to be 10−12–10−10 cm2/s as a function of applied voltage. The doping mechanism and dopant distribution profiles in the film are proposed for various conditions of applied voltages. Stability and cycle life of the cell during switching, and memory state under an applied voltage are discussed in terms of the degradation of polythiophene film.

Electronic Resource

1089-7550

AIP Digital Archive

Physics

Optical absorption spectra, photoluminescence (PL), Stokes shift, and electroluminescence (EL) in poly(disilanyleneoligothienylene)s have been found to be dependent on the length of oligothienylene units. The color of EL changes from green to red with increasing length of oligothienylene from three to seven thiophene rings. Their stability is much higher than polysilanylene and increases with increasing length of oligothienylene and by C60 doping. Photoconductivity is strongly enhanced and PL is remarkably quenched upon C60 doping, which were discussed by the photo-induced electron transfer between aromatic units in these polymers and C60. © 1999 American Institute of Physics.

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