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Search Results: 1 - 10 of 4740 matches for " Ken-ichiro Iijima "
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Li4Ti5O12 Synthesis with High Specific Surface Area and Single Phase  [PDF]
Toshihito Ohtake, Ken-ichiro Iijima
Journal of Materials Science and Chemical Engineering (MSCE) , 2015, DOI: 10.4236/msce.2015.39009
Abstract: We have investigated a novel Li4Ti5O12 synthesis with high specific surface area, high crystallization and single phase and its mechanism. The method was performed with a solid phase synthesis by using CH3COOLi·2H2O and anatase TiO2 via Li2TiO3 as an intermediate in pre-sintering at 500°C and sintering at 750°C. This result showed specific surface area of 12 m2/g and single phase- Li4Ti5O12 by applying the high specific surface anatase TiO2 as a precursor.
Surface Oxide Protection of Si(111) in Solution by the Surfactant Molecules  [PDF]
Toshihito Ohtake, Ken-ichiro Iijima
Journal of Surface Engineered Materials and Advanced Technology (JSEMAT) , 2017, DOI: 10.4236/jsemat.2017.74006
Abstract: It has been attempted to immobilize organic mono layer on semiconductor surface as functional materials. Silicon surface was especially noticed to develop highly efficient and functional devices, and the silicon devices were expected for the immobilized surface with organic layer. Then we have attempted the immobilization by the mono layer on the hydrogen terminated silicon surface with the alkyl base indicated hydrophobic by using a surfactant. We have observed interactions of immobilized molecules and organic molecules adsorbed on hydrogen terminated Si(111), which is aerosol OT as known surfactant and 4-cyanophenol as shown amphipathic molecule. The aerosol OT inhibited oxidation of Si(111) surface by adsorption to the hydrogen terminated surface to indicate hydrophobic. The 4-cyanophenol made the surface oxide by adsorption, and was desorbed by forming hydrophilic Si surface. In the case of the mixed solution by the aerosol OT and 4-cyanophenol, the aerosol OT controlled the surface oxidation on the hydrogen terminated Si against the 4-cyanophenol.
Oxygen Isotope Study of Silica Sinter from the Osorezan Geothermal Field, Northeast Japan  [PDF]
Ken-ichiro Hayashi
International Journal of Geosciences (IJG) , 2013, DOI: 10.4236/ijg.2013.410141

Silica sinter developed on the northern shore of Lake Usoriyama in the Osorezan geothermal field was examined for the occurrence, texture, crystallinity of silica minerals, and the concentrations of trace elements and oxygen isotopes. The silica sinter consists of a thick eastern mound (layer A) and a thin western part (layer B). Most of the silica sinter is composed of alternating bands of thin layers of silica minerals with colors varying from white to yellow and reddish gray. There is a unique stromatolitic texture, an aggregate of stratified concentric layers that extends upward and is red to reddish gray in color in the middle of layer A. Silica minerals, mainly opal-A and opal-CT, dominate the mineralogical constituents of the sinter. The δ18O of the silica mineral in layer A varies between 13‰ and 26‰, while layer B has higher values, between 19‰ and 33‰. The hydrothermal fluid from which the silica sinter precipitated is dominated by meteoric water is similar to present-day hot spring water.

Does Privatization of a Postal Savings Bank in Japan Have Economic Value?  [PDF]
Ken-Ichiro Oohama, Yoshihiro Asai
iBusiness (IB) , 2011, DOI: 10.4236/ib.2011.33032
Abstract: Economic theory traditionally supports the viewpoint that government ownership is inefficient and that privatization invariably leads to efficiency improvements. However, there is often frequent opposition to privatization activity because it is difficult to examine and empirically validate the effects of privatization. This is the first study to examine the impact of the privatization of postal saving banks. In this paper, we use event study and find that impacts of the privatization of a postal savings bank in Japan are evaluated as positive. We also find that the privatization of the postal savings bank threatened other banks in rural areas that had hitherto enjoyed a regional monopoly.
Rabies Virus Vector Transgene Expression Level and Cytotoxicity Improvement Induced by Deletion of Glycoprotein Gene
Shinya Ohara, Sho Sato, Kei Oyama, Ken-Ichiro Tsutsui, Toshio Iijima
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0080245
Abstract: The glycoprotein (G) of rabies virus (RV) is required for binding to neuronal receptors and for viral entry. G-deleted RV vector is a powerful tool for investigating the organization and function of the neural circuits. It gives the investigator the ability to genetically target initial infection to particular neurons and to control trans-synaptic propagation. In this study we have quantitatively evaluated the effect of G gene deletion on the cytotoxicity and transgene expression level of the RV vector. We compared the characteristics of the propagation-competent RV vector (rHEP5.0-CVSG-mRFP) and the G-deleted RV vector (rHEP5.0-ΔG-mRFP), both of which are based on the attenuated HEP-Flury strain and express monomeric red fluorescent protein (mRFP) as a transgene. rHEP5.0-ΔG-mRFP showed lower cytotoxicity than rHEP5.0-CVSG-mRFP, and within 16 days of infection we found no change in the basic electrophysiological properties of neurons infected with the rHEP5.0-ΔG-mRFP. The mRFP expression level of rHEP5.0-ΔG-mRFP was much higher than that of rHEP5.0-CVSG-mRFP, and 3 days after infection the retrogradely infected neurons were clearly visualized by the expressed fluorescent protein without any staining. This may be due to the low cytotoxicity and/or the presumed change in the polymerase gene (L) expression level of the G-deleted RV vector. Although the mechanisms remains to be clarified, the results of this study indicate that deletion of the G gene greatly improves the usability of the RV vector for studying the organization and function of the neural circuits by decreasing the cytotoxicity and increasing the transgene expression level.
Organization of Multisynaptic Inputs to the Dorsal and Ventral Dentate Gyrus: Retrograde Trans-Synaptic Tracing with Rabies Virus Vector in the Rat
Shinya Ohara, Sho Sato, Ken-Ichiro Tsutsui, Menno P. Witter, Toshio Iijima
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0078928
Abstract: Behavioral, anatomical, and gene expression studies have shown functional dissociations between the dorsal and ventral hippocampus with regard to their involvement in spatial cognition, emotion, and stress. In this study we examined the difference of the multisynaptic inputs to the dorsal and ventral dentate gyrus (DG) in the rat by using retrograde trans-synaptic tracing of recombinant rabies virus vectors. Three days after the vectors were injected into the dorsal or ventral DG, monosynaptic neuronal labeling was present in the entorhinal cortex, medial septum, diagonal band, and supramammillary nucleus, each of which is known to project to the DG directly. As in previous tracing studies, topographical patterns related to the dorsal and ventral DG were seen in these regions. Five days after infection, more of the neurons in these regions were labeled and labeled neurons were also seen in cortical and subcortical regions, including the piriform and medial prefrontal cortices, the endopiriform nucleus, the claustrum, the cortical amygdala, the medial raphe nucleus, the medial habenular nucleus, the interpeduncular nucleus, and the lateral septum. As in the monosynaptically labeled regions, a topographical distribution of labeled neurons was evident in most of these disynaptically labeled regions. These data indicate that the cortical and subcortical inputs to the dorsal and ventral DG are conveyed through parallel disynaptic pathways. This second-order input difference in the dorsal and ventral DG is likely to contribute to the functional differentiation of the hippocampus along the dorsoventral axis.
Supershell Effect and Stability of Classical Periodic Orbits in Reflection-Asymmetric Superdeformed Oscillator
Ken-ichiro Arita
Physics , 1993, DOI: 10.1143/PTP.90.747
Abstract: A semiclassical analysis is made of the origin of an undulating pattern in the smoothed level density for a reflection-asymmetric superdeformed oscillator potential. It is suggested that, when the octupole-type deformation increases, an interference effect between two families of periodic orbit with the ratio of periods approximately 2:1 becomes stronger and thus a pronounced ``supershell'' structure appears.
Persistent edge current in fractional quantum Hall liquids
Ken-ichiro Imura
Physics , 1998,
Abstract: The paper has been withdrawn.
Plateau transitions in fractional quantum Hall liquids
Ken-Ichiro Imura
Physics , 1999, DOI: 10.1007/s100510051110
Abstract: Effects of backward scattering between fractional quantum Hall (FQH) edge modes are studied. Based on the edge-state picture for hierarchical FQH liquids, we discuss the possibility of the transitions between different plateaux of the tunneling conductance $G$. We find a selection rule for the sequence which begins with a conductance $G=m/(mp\pm 1)$ ($m$: integer, $p$: even integer) in units of $e^2/h$. The shot-noise spectrum as well as the scaling behavior of the tunneling current is calculated explicitly.
New Shell Structure Originated from the Combination of Quadrupole and Octupole Deformations
Ken-ichiro Arita
Physics , 1994, DOI: 10.1016/0370-2693(94)90532-0
Abstract: Semiclassical analysis of the shell structure for a reflection-asymmetric deformed oscillator potential with irrational frequency ratio $\omega_\perp/\omega_z=\sqrt{3}$ is presented. Strong shell effects associated with bifurcations of short periodic orbits are found, which occur for a combination of quadrupole and octupole deformations.
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