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Now showing items 1 - 16 of 136

  • PHOSPHOR AND USE THEREOF

    Proposed is a phosphor which has improved water resistance, and whereby it becomes possible to effectively prevent the occurrence of adverse influence of a sulfur-containing gas and therefore effectively prevent the corrosion of a metallic member. A phosphor is proposed, which comprises: a sulfur-containing phosphor in which sulfur is contained in a matrix thereof; and particles or a layer which are or is provided on the surface of the phosphor and comprise or comprises a crystalline metal borate containing a IIA-Group element, boron and oxygen.
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  • PV Micro-Inverter Topology Using LLC Resonant Converter

    Watanabe, Hiroki   Itoh, Jun-ichi   Koike, Naoki   Nagai, Shinichiro  

    In this paper, a DC-single-phase AC power converter with an LLC resonant converter is presented for a photovoltaic (PV) micro-inverter application. This application requires the leakage current suppression capability. Therefore, an isolated power converter is usually combined for DC/AC systems. The LLC resonant converter is the one of the isolated power converter topologies, and it has good performance for conversion efficiency with easy control. On the other hand, a double-line frequency power ripple has to be compensated for in order to improve the performance of the maximum power point tracking (MPPT). Therefore, a bulky electrolytic capacitor is usually necessary for the power converter. However, the electrolytic capacitor may limit the lifetime of the micro-inverter. This paper introduces the PV micro-inverter with a LLC resonant converter. In addition, the active power decoupling circuit is applied in order to compensate the double-line frequency power ripple by the small capacitor in order to eliminate the electrolytic capacitor. Finally, the transformer design is considered in order to reduce the transformer losses. As a result, the conversion efficiency of the LLC converter is improved by 1% when the litz wire has many strands.
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  • PHOSPHOR, LED LIGHT-EMISSION ELEMENT, AND LIGHT SOURCE DEVICE

    The present invention relates to a CaS-based phosphor, and provides a novel CaS-based phosphor with which chemical reactions can be inhibited even if said CaS-based phosphor is heated with a heterogeneous material. This phosphor includes: a crystalline parent material represented by the composition formula Ca1-xSrxS・yZnO (in the formula, 0 ≤ x < 1, 0 < y ≤ 0.5); and a luminescent centre.
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  • RARE EARTH PHOSPHATE PARTICLES, METHOD FOR IMPROVING SCATTERING PROPERTY USING SAME

    Rare earth phosphate particles according to the present invention comprise aggregate particles composed of primary particles of a rare earth phosphate represented by LnPO4 (Ln represents at least one element selected from the group consisting of Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Yb and Lu). The volume cumulative particle diameter at a cumulative volume of 50 vol%, D50, of the aggregate particles is 0.1-20 µm as measured by a laser diffraction scattering-type particle size distribution measurement method. The rare earth phosphate particles of the present invention are disposed inside or on the surface of a substrate and are used to cause light scattering.
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  • Jasmonate regulates juvenile-to-adult phase transition in rice

    Isono, Miyako   Mimura, Manaki   Sentoku, Naoki   Kojima, Mikiko   Sakakibara, Hitoshi   Kitomi, Yuka   Yoshikawa, Takanori   Itoh, Jun-ichi   Nagato, Yasuo  

    Juvenile-to-adult phase transition is an important shift for the acquisition of adult vegetative characteristics and subsequent reproductive competence. We identified a recessive precocious (pre) mutant exhibiting a long leaf phenotype in rice. The long leaf phenotype is conspicuous in the second to the fourth leaves, which are juvenile and juvenile-to-adult transition leaves. We found that morphological and physiological traits, such as midrib formation, shoot meristem size, photosynthetic rate and plastochron, in juvenile and juvenile-to-adult transition stages of the pre mutant have precociously acquired adult characteristics. In agreement with these results, expression patterns of miR156 and miR172, which are microRNAs regulating phase change, support the accelerated juvenile-to-adult phase change in the pre mutant. The mutated gene encodes an allene oxide synthase (OsAOS1), which is a key enzyme for the biosynthesis of jasmonic acid (JA). The pre mutant showed a low level of JA and enhanced sensitivity to gibberellic acid, which promotes the phase change in some plant species. We also show that prolonged plastochron in the pre mutant is caused by accelerated PLASTOCHRON1 (PLA1) function. The present study reveals a substantial role of JA as a negative regulator of vegetative phase change.
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  • RED PHOSPHOR AND LIGHT-EMITTING ELEMENT

    The invention proposes a red phosphor represented by the general formula CaS:Eu wherein, in order to provide a novel CaS:Eu red phosphor having improved moisture resistance, the red phosphor has a Ba content of 0.001 to 1.00 mol% in terms of the CaS content.
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  • Organ fusion and defective shoot development in oni3 mutants of rice.

    Akiba, Takafumi   Hibara, Ken-Ichiro   Kimura, Fumiko   Tsuda, Katsutoshi   Shibata, Kiko   Ishibashi, Mayu   Moriya, Chihiro   Nakagawa, Kiyotaka   Kurata, Nori   Itoh, Jun-Ichi   Ito, Yukihiro  

    Maintenance of organ separation is one of the essential phenomena for normal plant development. We have identified and analyzed ONION3 (ONI3), which is required for avoiding organ fusions in rice. Loss-of-function mutations of ONI3, which were identified as mutants with ectopic expression of KNOX genes in leaves and morphologically resembling KNOX overexpressors, showed abnormal organ fusions in developing shoots. The mutant seedlings showed fusions between neighboring organs and also within an organ; they stopped growing soon after germination and subsequently died. ONI3 was shown to encode an enzyme that is most similar to Arabidopsis HOTHEAD and is involved in biosynthesis of long-chain fatty acids. Expression analyses showed that ONI3 was specifically expressed in the outermost cell layer in the shoot apex throughout life cycle, and the oni3 mutants had an aberrant outermost cell layer. Our results together with previous studies suggest that long-chain fatty acids are required for avoiding organ fusions and promoting normal shoot development in rice. =20
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  • SULFUR-CONTAINING PHOSPHOR COATED WITH ZNO COMPOUND

    Provided is a novel covered phosphor capable of effectively suppressing the adverse effects of hydrogen sulfide gas generated by the reaction between a sulfur-containing phosphor and moisture in air. This sulfur-containing phosphor is provided with a configuration in which ZnO compound containing Zn and O is present on the surface of a sulfur-containing phosphor having a parent body which includes sulfur.
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  • FLUOROPHORE

    The purpose of the present invention is to provide a novel fluorophore that is excited by a wide band of visible light, and that is capable of emitting near-infrared light of high intensity. Proposed is a fluorophore, characterized by having a crystal phase shown by formula (1): MCuSi2O6 (in the formula, M comprises one or more of Ba, Sr, and Ca), and a crystal phase shown by formula (2): MCuSi4O10 (in the formula, M comprises one or more of Ba, Sr, and Ca), the ratio β of the diffraction peak intensity of MCuSi4O10 to the diffraction peak intensity of MCuSi2O6 in an x-ray diffraction (XRD) pattern obtained by XRD measurement using CuK α rays satisfying the relationship 0 (adsbygoogle = window.adsbygoogle || []).push({}); ITOH, Jun-ichi (1333-2, Haraichi, Ageo-sh, Saitama 21, 〒3620021, JP) OZAWA, Ikuhiro (1333-2, Haraichi, Ageo-sh, Saitama 21, 〒3620021, JP) MORI, Takayoshi (1333-2, Haraichi, Ageo-sh, Saitama 21, 〒3620021, JP) JP2016/053962 09/09/2016 02/10/2016 Click for automatic bibliography generation MITSUI MINING & SMELTING CO.,LTD. (1-11-1, Osaki Shinagawa-k, Tokyo 84, 〒1418584, JP) C09K11/59 ; C09D7/12 ; C09D201/00 Download PDF WO/2016/140029A1 PDF help JPH09504771A 1997-05-13 G. GIESTER. ET AL.: "Wesselsite,SrCu[Si4010],a further new gillespite-group mineral from the Kalahari Manganese Field, South Africa", MINERALOGICAL MAGAZINE, vol. 60, 1996, pages 795 - 798, XP055478372 E.KENDRICK ET AL.: "Structure and colour properties in the Egyptian Blue Family,M1- xM'xCuSi4010,as a function of M, M' where M,M'=Ca,Sr and Ba", DYES AND PIGMENTS, vol. 73, pages 13 - 18, XP005527486 LI YA-JIE ET AL.: "Temperature-dependent near- infrared emission of highly concentrated Cu2+ in CaCuSi4010 phosphor", JOURNAL OF MATERIALS CHEMISTRY C, vol. 2, no. 48, 28 December 2014 (2014-12-28), pages 10395 - 10402, XP055478380, ISSN: 2050-7526 See also references of EP 3266849A4 TAKEUCHI, ICHIZAWA & ASSOCIATES (6F. Akasaka 2-chome Annex, 19-8 Akasaka 2-chome, Minato-k, Tokyo 52, 〒1070052, JP)
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  • YELLOW FLUORESCENT BODY

    Provided is a yellow fluorescent body that has increased internal quantum efficiency. Said yellow fluorescent body contains host crystals, which contain calcium, gallium, and sulfur; and luminescent centers. The yellow fluorescent body is characterized in that, in X-ray diffraction patterns using copper K-alpha lines, either the ratio between the diffraction intensity at a maximum peak appearing at a diffraction angle 2θ = 37–41° to the diffraction intensity at a maximum peak appearing at a diffraction angle 2θ = 15–20° is at most 0.80, or the ratio between the diffraction intensity at a maximum peak appearing at a diffraction angle 2θ = 29–33° to the diffraction intensity at the maximum peak appearing at a diffraction angle 2θ = 37–41° is at least 0.66.
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  • Rice DECUSSATE controls phyllotaxy by affecting the cytokinin signaling pathway

    Itoh, Jun-ichi   Hibara, Ken-ichiro   Kojima, Mikiko   Sakakibara, Hitoshi   Nagato, Yasuo  

    Phyllotaxy is defined as the spatial arrangement of leaves on the stem. The mechanism responsible for this extremely regular pattern is one of the most fascinating enigmas in plant biology. In this study, we identified a gene regulating the phyllotactic pattern in rice. Loss-of-function mutants of the DECUSSATE (DEC) gene displayed a phyllotactic conversion from normal distichous pattern to decussate. The dec mutants had an enlarged shoot apical meristem with enhanced cell division activity. In contrast to the shoot apical meristem, the size of the root apical meristem in the dec mutants was reduced, and cell division activity was suppressed. These phenotypes indicate that DEC has opposite functions in the shoot apical meristem and root apical meristem. Map-based cloning revealed that DEC encodes a plant-specific protein containing a glutamine-rich region and a conserved motif. Although its molecular function is unclear, the conserved domain is shared with fungi and animals. Expression analysis showed that several type A response regulator genes that act in the cytokinin signaling pathway were down-regulated in the dec mutant. In addition, dec seedlings showed a reduced responsiveness to exogenous cytokinin. Our results suggest that DEC controls the phyllotactic pattern by affecting cytokinin signaling in rice.
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  • Rice DECUSSATE controls phyllotaxy by affecting the cytokinin signaling pathway

    Itoh, Jun-ichi   Hibara, Ken-ichiro   Kojima, Mikiko   Sakakibara, Hitoshi   Nagato, Yasuo  

    Phyllotaxy is defined as the spatial arrangement of leaves on the stem. The mechanism responsible for this extremely regular pattern is one of the most fascinating enigmas in plant biology. In this study, we identified a gene regulating the phyllotactic pattern in rice. Loss-of-function mutants of the DECUSSATE (DEC) gene displayed a phyllotactic conversion from normal distichous pattern to decussate. The dec mutants had an enlarged shoot apical meristem with enhanced cell division activity. In contrast to the shoot apical meristem, the size of the root apical meristem in the dec mutants was reduced, and cell division activity was suppressed. These phenotypes indicate that DEC has opposite functions in the shoot apical meristem and root apical meristem. Map-based cloning revealed that DEC encodes a plant-specific protein containing a glutamine-rich region and a conserved motif. Although its molecular function is unclear, the conserved domain is shared with fungi and animals. Expression analysis showed that several type A response regulator genes that act in the cytokinin signaling pathway were down-regulated in the dec mutant. In addition, dec seedlings showed a reduced responsiveness to exogenous cytokinin. Our results suggest that DEC controls the phyllotactic pattern by affecting cytokinin signaling in rice.
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  • A Novel Five-Level Three-Phase PWM Rectifier With Reduced Switch Count

    Itoh, Jun-ichi   Noge, Yuichi   Adachi, Taketo  

    This paper proposes a new circuit topology for a multilevel pulse width modulation (PWM) rectifier. The proposed method forms a new circuit by combining a diode clamp-type topology with a flying capacitor-type topology. The proposed circuit uses only 12 switches, despite the use of a five-level three-phase PWM rectifier. Further, the proposed circuit can obtain good performance, same as a conventional multilevel circuit. This paper describes about the features of the proposed topology; the control strategy and the loss analysis that is estimated by a circuit simulator. In addition, the basic operation of the proposed method is confirmed by simulation and experimental results. The proposed converter achieved total harmonic distortion of 3.4% for the input current and efficiency of 97.4% for a 1 kW class experimental setup.
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  • Investigation of a Two-Stage Boost Converter Using the Neutral Point of a Motor

    Itoh, Jun-Ichi   Ikarashi, Daisuke  

    Control strategy and loss evaluation is discussed for a proposed dc/ac two-stage boost converter using the neutral point of a motor. The proposed converter consists of a small boost chopper and a three-phase inverter, which has a boost-up function from the use of the leakage inductance of a motor, instead of a boost-up reactor, for dc to ac conversion. A six-step operation strategy is proposed for the circuit. When the inverter part outputs a square waveform of 180deg, the input current has a distortion because the neutral point voltage of the motor fluctuates at a frequency three times the output frequency. The input current is also shown distorted due to the neutral point voltage fluctuation. Feedforward compensation is proposed to reduce the input current fluctuation. In addition, the dc current in the proposed circuit is imposed into the phase current of the motor. Loss evaluation is therefore implemented to investigate the influence of the imposed dc current on the experimental results. Also, finite-element method was used to analyze the motor loss for a 1.5-kW interior-permanent-magnet motor.
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  • PHOSPHOR

    Disclosed is a phosphor which is excited by a blue LED or a near ultraviolet LED, emits visible light and can enhance internal quantum efficiency. The phosphor, which contains an orthorhombic crystal containing Ga and S, is characterized in that, in an XRD pattern using CuKα-ray, the ratio of the diffraction intensity of a maximum peak appearing at a diffraction angle 2θ=16.0-18.0 to the diffraction intensity of a maximum peak appearing at a diffraction angle 2θ=23.6-24.8 is 0.4 or more.
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  • A Novel Three-Phase PFC Rectifier Using a Harmonic Current Injection Method

    Itoh, Jun-Ichi   Ashida, Itsuki  

    This paper proposes a novel circuit topology for a three-phase power factor correction (PFC) rectifier using a harmonics current injection method. In consideration of lower cost, the harmonics injection method is more suitable than a conventional six-arm pulse width modulation (PWM) rectifier. The harmonics injection current is simply generated by only one switching leg. As a result, the proposed circuit has the advantage of only two switches. An optimal injection current is achieved in order to obtain an input current of sinusoidal waveforms. This paper discusses the basic operation and optimal design method for the proposed circuit. In addition, the validity of the proposed circuit is confirmed by simulation and experimental results. An input current of almost sinusoidal waveform was obtained and an input current total harmonic distortion (THD) of 8.5% was obtained at a load of approximately 1 kW.
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