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Now showing items 1 - 16 of 144

  • Poly(tetrafluoroethylene) is Unique for Orienting Molecules

    Tanaka, Toshihiko   Ishitobi, Masamitsu  

    A physical insight regarding poly(tetrafluoroethylene) (PTFE) is revealed herein. The driving force for the oriented growth of materials on aligned PTFE is investigated. The growth has been reported in numerous publications for a wide range of deposited materials on aligned PTFE layers since its discovery in 1991 because it is a promising method for preparing ordered molecular films. MD model simulations demonstrate herein that the shallow charged atomic grooves between adjacent PTFE chains trap typical two linear molecules, thus explaining the remarkable degrees of uniaxial orientation in their deposited thin films on the layers. Charge modifications to the model demonstrate for the first time that the negative charge of its fluorine atoms is crucial for the remarkable degrees. Hence, such an orientation is only possible with PTFE.
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  • New Hybrid Static VAR Compensator with Series Active Filter

    Tokiwa, Ayumu   Yamada, Hiroaki   Tanaka, Toshihiko   Watanabe, Makoto   Shirai, Masanao   Teranishi, Yuji  

    This paper proposes a new hybrid static VAR compensator (SVC) with a series active filter (AF). The proposed hybrid SVC consists of a series AF and SVC. The series AF, which is connected in series to phase-leading capacitors in the SVC, performs for a resistor for source-side harmonic currents. A sinusoidal source current with a unity power factor is obtained with the series AF, although the thyristor-controlled reactor generates harmonic currents. A digital computer simulation was implemented to confirm the validity and high practicability of the proposed hybrid SVC using PSIM software. The simulation results demonstrate that sinusoidal source currents with a unity power factor are achieved with the proposed hybrid SVC.
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  • Analysis of primary treatment and prognosis of spontaneous urticaria

    Tanaka, Toshihiko   Hiragun, Makiko   Hide, Michihiro   Hiragun, Takaaki  

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  • Poly(tetrafluoroethylene) is unique in orienting molecule

    Tanaka, Toshihiko   Ishitobi, Masamitsu  

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  • Resonant Gate Driver for a Normally ON GaN HEMT

    Okamoto, Masayuki   Ishibashi, Takaharu   Yamada, Hiroaki   Tanaka, Toshihiko  

    Wide bandgap semiconductors such as silicon carbide and gallium nitride (GaN) are promising materials for next-generation power devices. A normally ON GaN-based high-electron-mobility transistor (GaN HEMT) is fabricated for power electronic converters. However, the power consumption in the previously proposed gate drive circuit increases when the GaN HEMT is used for higher frequency operations; a new gate drive circuit with a lower power consumption for the normally ON GaN HEMT is essential. In this paper, a new resonant gate drive circuit, most suitable for the GaN HEMT we had fabricated, is proposed. The validity and the considerable practicability of the proposed resonant gate drive circuit are demonstrated by the experimental results.
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  • Robust Controller Design for Sinusoidal PWM Inverters

    Wakasa, Yuji   Baba, Yusuke   Tanaka, Toshihiko   Tanaka, Kanya  

    This paper proposes a robust controller for sinusoidal pulse width modulation (PWM) inverters, which can track a sinusoidal reference with zero steady-state error. A closed-loop system for single-phase full-bridge inverters is constructed on the basis of the internal model principle. The appropriate control gains of the constructed closed-loop system are determined using a state-feedback controller design method via linear matrix inequalities. The proposed controller can adapt to the uncertain variations in the load conditions. It is also shown that the pole-placement constraints and control performance indexes based on the H-2 and H norms as well as a standard quadric performance index in optimal control can be applied to the proposed robust controller. Digital computer simulation is implemented to confirm the validity of the proposed robust controller with the internal model principle. A prototype experimental model is constructed and tested. Experimental results demonstrate that an excellent and practical robust controller for sinusoidal PWM inverters is realized under uncertain and fluctuating load conditions, including the nonlinear loads such as diode rectifiers. (c) 2014 Wiley Periodicals, Inc. Electr Eng Jpn, 187(2): 44-52, 2014; Published online in Wiley Online Library (). DOI 10.1002/eej.22542
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  • Type I Chiari malformation presenting central sleep apnea.

    Kitamura, Takuro   Miyazaki, Soichiro   Kadotani, Hiroshi   Kanemura, Takashi   Okawa, Masako   Tanaka, Toshihiko   Komada, Ichiro   Hatano, Taketo   Suzuki, Hideaki  

    Sleep apnea is a rare but a well-known clinical feature of type I Chiari malformation. It may be obstructive or central in nature. Sleep apnea in patients with type I Chiari malformation rarely presents without accompanying neurological signs or symptoms. We here report a case of a 10-year-old girl who presented with central sleep apnea without any other neurological signs but was ultimately diagnosed with type I Chiari malformation. The patient initially showed mild improvement in symptoms after administration of an acetazolamide. Finally, posterior fossa decompression dramatically improved her respiratory status during sleep, both clinically and on polysomnography. This case suggests that type I Chiari malformation should be considered in the differential diagnoses of central apneas in children, even if there are no other neurological signs and symptoms. Furthermore, sagittal craniocervical magnetic resonance imaging may be necessary for a definitive diagnosis. Copyright =C2=A9 2013 Elsevier Ireland Ltd. All rights reserved.
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  • Highly Oriented J-Aggregates of Nitroazo Dye and Its Surface-Induced Chromism

    Tanaka, Toshihiko   Ishitobi, Masamitsu   Aoyama, Tetsuya   Matsumoto, Shinya  

    Highly oriented J-aggregates of a nitroazo dye were obtained in solid thin films on aligned poly(tetrafluoroethylene) surfaces. During film deposition on a friction-transferred poly(tetrafluoroethylene) layer, a sharp peak grew in the polarized absorption spectra around 613 nm, which was red-shifted 117 nm from the peak in dilute dichloromethane solution. The peak showed remarkable optical anisotropy: dichroic ratios D of up to 22 were observed, and the intrinsic D value should substantially exceed this value. These results indicate that the peak is attributable to highly oriented J-aggregates. On glass, however, H-like aggregates grew, exhibiting an absorption peak at 410 nm. Hence, the substrate surface induced the remarkable chromism observed as a 203 nm red shift.
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  • Highly Oriented J-Aggregates of Nitroazo Dye and Its Surface-Induced Chromism

    Tanaka, Toshihiko   Ishitobi, Masamitsu   Aoyama, Tetsuya   Matsumoto, Shinya  

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  • Oriented Pyrazine Dye Films on Aligned Poly(tetrafluoroethylene) Layers

    Tanaka, Toshihiko   Ishitobi, Masamitsu   Matsumoto, Shinya  

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  • METHOD FOR HEATING FINE METAL MATERIAL, AND METHOD AND DEVICE FOR DETECTING METAL

    Provided are: a method for heating a metal material wherein it is possible to heat a metal material in a short time with a small energy loss; and a method and a device for detecting metal wherein it is possible to rapidly and accurately detect metal included in an inspection subject having an arbitrary shape and size. A method comprising arranging a metal material on the outside of a gap between the magnetic poles of a inductive heating means obtained by winding a coil around a frame-shaped yoke core having the gap, passing a high-frequency current through the coil, generating a curved magnetic field on the outside of the gap, applying the curved magnetic field to the metal material, and heating the metal material by electromagnetic inductance produced by the curved magnetic field. A method and a device for detecting the generation of heat in the metal included in a specimen using this heating method.
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  • Effects of greenhouse photovoltaic array shading on Welsh onion growth

    Kadowaki, Masayuki   Yano, Akira   Ishizu, Fumito   Tanaka, Toshihiko   Noda, Shuji  

    The use of renewable energy for greenhouse environment control to replace or reduce the consumption of fuel and power-line electricity is an important objective for sustainable greenhouse crop production. This study was undertaken to apply a solar photovoltaic (PV) array to supply electricity for greenhouse environment control. The PV array was mounted inside the south roof of an east west oriented single-span greenhouse, in which Welsh onion (Allium fistulosum L.) was cultivated hydroponically. Effects of PV-array shading on the Welsh onion growth were assessed. Two PV-array formations were tested: straight-line and checkerboard. For each arrangement, the PV array covered 12.9% of the greenhouse roof area. Beside the PV greenhouse, a control greenhouse was built with identical dimensions and orientation to those of the PV greenhouse. Welsh onion was cultivated also in the control greenhouse. The straight-line arranged PV-array (PVs array) cast shadows on a specific area of the cultivated plants continuously during the growth period. The fresh weight (FW) and dry-matter weight (DW) of Welsh onion cultivated under the PVs array shadow were significantly less than those of Welsh onion cultivated in the control greenhouse. The checkerboard PV-array (PVc array) cast shadows in the PVc greenhouse intermittently during growth. Consequently, the inhibitory effects of the PV-array shading on the FW and DW accumulations of Welsh onion were diminished. The electrical energy generated by the PVc array was comparable to that of the PVs array, which is another advantage of the PVc array. (C) 2012 IAgrE. Published by Elsevier Ltd. All rights reserved.
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  • Phase defect analysis with actinic full-field EUVL mask blank inspection

    Yamane, Takeshi   Tanaka, Toshihiko   Terasawa, Tsuneo   Suga, Osamu  

    We had developed an actinic full-field inspection system to detect multilayer phase-defects with dark field imaging. Regarding the actinic inspection of native defects, the influence of the defect's surface dimension and multilayer structure, on the intensity-signal obtained from the inspection was analyzed. Three mask blanks were inspected from which 55 defects, observed with AFM and SEM, were classified as amplitude-defects or phase-defects. The surface dimensions and SEVDs (sphere equivalent volume diameters) of the defects were measured with the AFM. In the case where their SEVDs were same as of the programmed phase-defects, they were found to produce stronger intensity-signals in comparison to the ones from the programmed phase-defects. Cross-sectional multilayer structures of two native phase-defects were observed with TEM, and those defects formed non-conformal structures in the multilayer. This result means that most of the native phase-defects tend to form a non-conformal structure, and can make large impact on the wafer image in comparison to the ones from a conformal structure. Besides phase-defects, the actinic inspection also detected amplitude-defects. Although the sensitivities of the amplitude-defects were found to be lower than those of the phase-defects, an amplitude-defect higher than 30 nm could be detected with high probability.
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  • Highly Dichroic and Luminescent Triphenodioxazine Dyes

    Tanaka, Toshihiko   Ashida, Toru   Matsumoto, Shinya  

    We report herein a triphenodioxazine dye, which is highly dichroic and luminescent in liquid crystal (LC). The dye shows remarkable polarization dependence resulting from its high orientational order up to 0.88: the dichroic ratios from its absorption and that from the emission reach 22.1 and 67.7, respectively. Such high order has never been reported for luminescent dyes in LC, thus showing appreciable potential advantage for some applications.
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  • Light-shield border impact on the printability of extreme-ultraviolet mask

    Kamo, Takashi   Tawarayama, Kazuo   Tanaka, Yuusuke   Arisawa, Yukiyasu   Aoyama, Hajime   Tanaka, Toshihiko   Suga, Osamu  

    When a thinner absorber mask is applied to extreme ultraviolet (EUV) lithography for chip production, it becomes essential to a introduce light-shield border in order to suppress the leakage of EUV light from the adjacent exposure shots. In this paper, we evaluate the leakage of both EUV and out-of-band from light-shield border and clarify the dependence of lithographic performance on light-shield border structure using a small field exposure tool with/without spectral purify filter (SPF). Then we evaluate the lithographic performance of a thin absorber EUV mask with light-shield border of the etched multilayer type and demonstrate the merit of its structure using a full-field scanner operating under the currently employed condition of EUV source in which SPF is not installed. (C) 2011 Society of Photo-Optical Instrumentation Engineers (SPIE). [DOI:10.1117/1.3574117]
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  • TRANSPARENT THIN-FILM ELECTRODE

    Provided is a transparent thin-film electrode characterized in that light transmitted through the transparent thin-film electrode is polarized. The transparent thin-film electrode comprises a conductive polymer or the transparent thin-film electrode comprises a carbon nanotube. Consequently, the transparent thin-film electrode and a liquid crystal display device or a light-emitting element using the same which has industrially satisfactory performance can be provided without using indium that has a problem in terms of stable supply and cost because the amount of indium as a resource is small and the price thereof rises sharply due to stringent demand.
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