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Nakao, Makoto,Hosono, Satoyo,Ito, Hidemi,Oze, Isao,Watanabe, Miki,Mizuno, Nobumasa,Yatabe, Yasushi,Yamao, Kenji,Niimi, Akio,Tajima, Kazuo,Tanaka, Hideo,Matsuo, Keitaro Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.7
Background: Cigarette smoking is a well-established risk factor of pancreatic cancer (PC). Although an association between nicotine dependence phenotype, namely time to first cigarette (TTFC) after waking, and the risk of several smoking-related cancers has been reported, an association between TTFC and PC risk has not been reported. We assessed the impact of smoking behavior, particularly TTFC, on PC risk in a Japanese population. Materials and Methods: We conducted a case-control study using 341 PC and 1,705 non-cancer patients who visited Aichi Cancer Center in Nagoya, Japan. Exposure to risk factors, including smoking behavior, was assessed from the results of a self-administered questionnaire. The impact of smoking on PC risk was assessed with multivariate logistic regression analysis adjusted for potential confounders to estimate odds ratios (ORs) and 95% confidence intervals (CIs). Results: Cigarettes per day (CPD) and/or smoking duration were significantly associated with PC risk, consistent with previous studies. For TTFC and PC risk, we found only a suggestive association: compared with a TTFC of more than 60 minutes, ORs were 1.15 (95%CI, 0.65-2.04) for a TTFC of 30-60 minutes and 1.35 (95%CI, 0.85-2.15) for that of 0-30 minutes (p trend=0.139). After adjustment for CPD or smoking duration, no association was observed between TTFC and PC. Conclusions: In this study, we found no statistically significant association between TTFC and PC risk. Further studies concerning TTFC and PC risk are warranted.
Kim, Ye Ji,Kim, Sun Min,Hosono, Hideo,Yang, Jung Woon,Kim, Sung Wng The Royal Society of Chemistry 2014 Chemical communications Vol.50 No.37
<P>The scalable pinacol coupling reaction is realized utilizing the inorganic electride [Ca2N](+)center dot e(-) as an electron donor in organic solvents. The bond cleavages of the [Ca2N](+) layers by methanol play a vital role in transferring anionic electrons to electrophilic aldehydes, accompanying the formation of Ca(OMe)(2) and ammonia.</P>
Homogeneous Coexistence and Phase Segregation in 1111 Iron-based Pnictides Studied via NMR
Naoki Fujiwara,Yoichi Kamihara,Satoru Matsuishi,Hideo Hosono 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
We performed 75As and 51Co nuclear magnetic resonance (NMR) measurements onLaFeAsO1−xFx (La1111), a prototype of iron-based superconductors, and on Ca(Fe1−xCox)AsF(Ca1111), which has a small overlap between the antiferromagnetic (AF) and superconducting(SC) domes in the electronic phase diagram. We found in the Ca1111 series that AF and SC statescoexist homogeneously in the overlapped region, while in the La1111 series, we found that paramagnetic(PM) and SC domains coexist around the AF-SC phase boundary. The coexistence of thesedomains indicates that the AF and SC domes segregate from each other in the electronic phasediagram.
Photofield-Effect in Amorphous In-Ga-Zn-O (a-IGZO) Thin-Film Transistors
Tze-Ching Fung,Chiao-Shun Chuangc,Kenji Nomura,Han-Ping David Shieh,Hideo Hosono,Jerzy Kanicki 한국정보디스플레이학회 2008 Journal of information display Vol.9 No.4
We studied both the wavelength and intensity dependent photo-responses (photofield-effect) in amorphous In-Ga-Zn-O (a-IGZO) thin-film transistors (TFTs). During the a-IGZO TFT illumination with the wavelength range from 460~660 nm (visible range), the off-state drain current (IDS_off) only slightly increased while a large increase was observed for the wavelength below 400 nm. The observed results are consistent with the optical gap of ~3.05eV extracted from the absorption measurement. The a-IGZO TFT properties under monochromatic illumination (λ=420nm) with different intensity was also investigated and IDS_off was found to increase with the light intensity. Throughout the study, the field-effect mobility (μeff) is almost unchanged. But due to photo-generated charge trapping, a negative threshold voltage (Vth) shift is observed. The mathematical analysis of the photofield-effect suggests that a highly efficient UV photocurrent conversion process in TFT off-region takes place. Finally, a-IGZO mid-gap density-of-states (DOS) was extracted and is more than an order of magnitude lower than reported value for hydrogenated amorphous silicon (a-Si:H), which can explain a good switching properties observed for a-IGZO TFTs.
Photofield-Effect in Amorphous In-Ga-Zn-O (a-IGZO) Thin-Film Transistors
Fung, Tze-Ching,Chuang, Chiao-Shun,Nomura, Kenji,Shieh, Han-Ping David,Hosono, Hideo,Kanicki, Jerzy The Korean Infomation Display Society 2008 Journal of information display Vol.9 No.4
We studied both the wavelength and intensity dependent photo-responses (photofield-effect) in amorphous In-Ga-Zn-O (a-IGZO) thin-film transistors (TFTs). During the a-IGZO TFT illumination with the wavelength range from $460\sim660$ nm (visible range), the off-state drain current $(I_{DS_off})$ only slightly increased while a large increase was observed for the wavelength below 400 nm. The observed results are consistent with the optical gap of $\sim$3.05eV extracted from the absorption measurement. The a-IGZO TFT properties under monochromatic illumination ($\lambda$=420nm) with different intensity was also investigated and $I_{DS_off}$ was found to increase with the light intensity. Throughout the study, the field-effect mobility $(\mu_{eff})$ is almost unchanged. But due to photo-generated charge trapping, a negative threshold voltage $(V_{th})$ shift is observed. The mathematical analysis of the photofield-effect suggests that a highly efficient UV photocurrent conversion process in TFT off-region takes place. Finally, a-IGZO mid-gap density-of-states (DOS) was extracted and is more than an order of magnitude lower than reported value for hydrogenated amorphous silicon (a-Si:H), which can explain a good switching properties observed for a-IGZO TFTs.
Kim, Ye Ji,Kim, Sun Min,Cho, Eun Jin,Hosono, Hideo,Yang, Jung Woon,Kim, Sung Wng Royal Society of Chemistry 2015 Chemical Science Vol.6 No.6
<▼1><P>A simple and highly efficient transfer hydrogenation of alkynes and alkenes by using a two-dimensional electride, dicalcium nitride ([Ca<SUB>2</SUB>N]<SUP>+</SUP>·e<SUP>–</SUP>), as an electron transfer agent is disclosed.</P></▼1><▼2><P>A simple and highly efficient transfer hydrogenation of alkynes and alkenes by using a two-dimensional electride, dicalcium nitride ([Ca<SUB>2</SUB>N]<SUP>+</SUP>·e<SUP>–</SUP>), as an electron transfer agent is disclosed. Excellent yields in the transformation are attributed to the remarkable electron transfer efficiency in the electride-mediated reactions. It is clarified that an effective discharge of electrons from the [Ca<SUB>2</SUB>N]<SUP>+</SUP>·e<SUP>–</SUP> electride in alcoholic solvents is achieved by the decomposition of the electride <I>via</I> alcoholysis and the generation of ammonia and Ca(O<SUP>i</SUP>Pr)<SUB>2</SUB>. We found that the choice of solvent was crucial for enhancing the electron transfer efficiency, and a maximum efficiency of 80% was achieved by using a DMF mixed isopropanol co-solvent system. This is the highest value reported to date among single electron transfer agents in the reduction of C–C multiple bonds. The observed reactivity and efficiency establish that electrides with a high density of anionic electrons can readily participate in the reduction of organic functional groups.</P></▼2>
Strong Enhancement of Superconductivity in Inorganic Electride 12CaO·7Al2O3:e− under High Pressure
Shigeki Tanaka,Tomoki Kato,Atsushi Miyake,Tomoko Kagayama,Katsuya Shimizu,Sung Wng Ki,Satoru Matsuishi,Hideo Hosono 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
We present the results of the pressure dependence of the superconductivity of the inorganicelectride 12CaO·7Al2O3:e− (C12A7:e−) single crystal through the ac-susceptibility measurementunder high pressure. C12A7:e− has the cage structure and the density of states derived fromthe cages may play an important role in the superconductivity. The superconducting transitiontemperature (Tc) is 0.2 K at ambient pressure and monotonically increases up to 1.79 K at4.7 GPa. The upper critical field Hc2 and −dHc2/dT at Tc, in proportion to the density of states(DOS) at Fermi energy becomes larger under high pressure. The superconductivity in C12A7:e− ismediated by the electron-phonon interaction, and the increase of Tc with pressure may arise froma peak structure of the DOS of cage conduction band.
Park, Jongho,Lee, Kimoon,Lee, Seung Yong,Nandadasa, Chandani N.,Kim, Sungho,Lee, Kyu Hyoung,Lee, Young Hee,Hosono, Hideo,Kim, Seong-Gon,Kim, Sung Wng American Chemical Society 2017 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.139 No.2
<P>We have synthesized a single crystalline Y2C electride of centimeter-scale by floating-zone method and successfully characterized its anisotropic electrical and magnetic properties. In-plane resistivity upturn at low temperature together with anisotropic behavior of negative magnetoresistance is ascribed to the stronger suppression of spin fluctuation along in-plane than that along the c-axis, verifying the existence of magnetic moments preferred for the c-axis. A superior magnetic moment along the c-axis to that along the in-plane direction strongly demonstrates the anisotropic magnetism of Y2C electride containing a magnetically easy axis. It is clarified from the theoretical calculations that the anisotropic nature of the Y2C electride originates from strongly localized anionic electrons with an inherent magnetic anisotropy in the interlayer spaces.</P>