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Risa Yamada(Risa Yamada ),Takeshi Fujii(Takeshi Fujii ),Kotaro Hattori(Kotaro Hattori ),Hiroaki Hori(Hiroaki Hori ),Ryo Matsumura(Ryo Matsumura ),Tomoko Kurashimo(Tomoko Kurashimo ),Naoko Ishihara(Nao 대한정신약물학회 2023 CLINICAL PSYCHOPHARMACOLOGY AND NEUROSCIENCE Vol.21 No.2
Objective: This study aimed to determine if the discrepancy between depression severity rated by clinicians and that reported by patients depends on key behavioral/psychological features in patients with mood disorders. Methods: Participants included 100 patients with mood disorders. First, we examined correlations and regressions between scores on the Hamilton Depression Rating Scale (HAMD) and Beck Depression Inventory (BDI). Second, we divided the participants into those who provided 1) greater ratings for the BDI compared with the HAMD (BDI relative- overrating, BO) group, 2) comparable ratings for the BDI and HAMD (BDI relatively concordant, BC) group, or 3) less ratings for the BDI (BDI relative-underrating, BU) group. Adverse childhood experiences, autistic-like traits, and coping styles were evaluated with a six-item short version of the Childhood Trauma Questionnaire (CTQ-6), the Social Responsiveness Scale for Adults (SRS-A), and the Ways of Coping Checklist (WCCL), respectively. Results: A significant correlation was found between HAMD and BDI scores. Total and emotional abuse subscale scores from the CTQ-6, and the self-blame subscale scores from the WCCL were significantly higher for the BO group compared with the BU group. The BO group also elicited significantly higher SRS-A total scores than did the other groups. Conclusion: These findings suggest that patients with adverse emotional experiences, autistic-like traits, and self-blame coping styles perceive greater distress than that evaluated objectively by clinicians. The results indicate the need for inclusion of subjective assessments to effectively evaluate depressive symptoms in patients deemed to have these psycho- behavioral concerns.
Yamada, Yusuke,Yano, Kentaro,Fukuzumi, Shunichi The Royal Society of Chemistry 2012 ENERGY AND ENVIRONMENTAL SCIENCE Vol.5 No.1
<p>Cu<SUB>2</SUB>O particles are active catalysts for hydrogen evolution from ammonia borane (AB) by hydrolysis, however, Cu<SUB>2</SUB>O particles easily form agglomerates as a result of highly reduced conditions during the reaction. In order to suppress agglomerate formation, capping of Cu<SUB>2</SUB>O with organic reagents or inorganic materials was performed and the catalytic reactivity in AB hydrolysis was examined. Among the examined methods, capping of Cu<SUB>2</SUB>O particles with Co<SUB>3</SUB>O<SUB>4</SUB> nanoparticles was the most effective to avoid agglomerate formation of Cu<SUB>2</SUB>O particles. The finding enabled us to examine the shape effect of Cu<SUB>2</SUB>O particles on the catalytic reactivity in AB hydrolysis in the presence of Co<SUB>3</SUB>O<SUB>4</SUB> nanoparticles. Comparisons of turnover frequencies for hydrogen evolution of Cu<SUB>2</SUB>O–Co<SUB>3</SUB>O<SUB>4</SUB> composites, in which Cu<SUB>2</SUB>O particles were in the shape of 50-facets, cube, octahedron or rhombicuboctahedron, indicated that the composite with Cu<SUB>2</SUB>O with the shape of 50-facets showed more than 7-fold higher hydrogen evolution rate normalized by surface area than the composite with Cu<SUB>2</SUB>O with the octahedral shape. The size and shape effects of Co<SUB>3</SUB>O<SUB>4</SUB> nanoparticles were also investigated on their ability to protect Cu<SUB>2</SUB>O from agglomeration. Comparisons of the catalytic reactivity of Cu<SUB>2</SUB>O particles decorated with Co<SUB>3</SUB>O<SUB>4</SUB> nanoparticles of different sizes and shapes in terms of amounts and rates of hydrogen evolved by AB hydrolysis indicated that the size of Co<SUB>3</SUB>O<SUB>4</SUB> nanoparticles is more important than the shape to exhibit high catalytic reactivity.</p> <P>Graphic Abstract</P><P>Hydrogen evolution from ammonia borane by hydrolysis has been conducted with Cu<SUB>2</SUB>O particles covered with Co<SUB>3</SUB>O<SUB>4</SUB> nanoparticles. <img src='http://pubs.rsc.org/ej/EE/2012/c1ee02639a/c1ee02639a-ga.gif'> </P>
THE RICCI CURVATURE ON DIRECTED GRAPHS
Yamada, Taiki Korean Mathematical Society 2019 대한수학회지 Vol.56 No.1
In this paper, we consider the Ricci curvature of a directed graph, based on Lin-Lu-Yau's definition. We give some properties of the Ricci curvature, including conditions for a directed regular graph to be Ricci-flat. Moreover, we calculate the Ricci curvature of the cartesian product of directed graphs.
Suppression of multiple photon absorption in a SiC photonic crystal nanocavity operating at 1.55 μm.
Yamada, Shota,Song, Bong-Shik,Upham, Jeremy,Asano, Takashi,Tanaka, Yoshinori,Noda, Susumu Optical Society of America 2012 Optics express Vol.20 No.14
<P>We show that a SiC photonic crystal cannot only inhibit two photon absorption completely, but also suppress higher-order multiple photon absorption significantly at telecommunication wavelengths, compared to conventional Si-based photonic crystal nanocavities. Resonant spectra of a SiC nanocavity maintain a Lorentzian profile even at input energies 100 times higher than what can be applied to a Si nanocavity without causing nonlinear effects. Theoretical fitting of the results indicates that the four photon absorption coefficient in the SiC nanocavity is less than 2.0 10(-5) cm(5)/GW(3). These results will contribute to the development of high-power applications of SiC nanocavities such as harmonic generation, parametric down conversion, and Raman amplification.</P>
Yamada, Yusuke,Maeda, Kazuki,Ohkubo, Kei,Karlin, Kenneth D.,Fukuzumi, Shunichi The Royal Society of Chemistry 2012 Physical chemistry chemical physics Vol.14 No.27
<P>The catalytic durability of an organic photocatalyst, 9-mesityl-10-methyl acridinium ion (Acr<SUP>+</SUP>–Mes), has been dramatically improved by the addition of [{tris(2-pyridylmethyl)amine}Cu<SUP>II</SUP>](ClO<SUB>4</SUB>)<SUB>2</SUB> ([(tmpa)Cu<SUP>II</SUP>]<SUP>2+</SUP>) in the photocatalytic oxygenation of <I>p</I>-xylene by molecular oxygen in acetonitrile. Such an improvement is not observed by the addition of Cu(ClO<SUB>4</SUB>)<SUB>2</SUB> in the absence of organic ligands. The addition of [(tmpa)Cu]<SUP>2+</SUP> in the reaction solution resulted in more than an 11 times higher turnover number (TON) compared with the TON obtained without [(tmpa)Cu<SUP>II</SUP>]<SUP>2+</SUP>. In the photocatalytic oxygenation, a stoichiometric amount of H<SUB>2</SUB>O<SUB>2</SUB> formation was observed in the absence of [(tmpa)Cu<SUP>II</SUP>]<SUP>2+</SUP>, however, much less H<SUB>2</SUB>O<SUB>2</SUB> formation was observed in the presence of [(tmpa)Cu<SUP>II</SUP>]<SUP>2+</SUP>. The photocatalytic mechanism was investigated by laser flash photolysis measurements in order to detect intermediates. The reaction of O<SUB>2</SUB>&z.rad;<SUP>−</SUP> with [(tmpa)Cu<SUP>II</SUP>]<SUP>2+</SUP> monitored by UV-vis spectroscopy in propionitrile at 203 K suggested formation of [{(tmpa)Cu<SUP>II</SUP>}<SUB>2</SUB>O<SUB>2</SUB>]<SUP>2+</SUP>, a transformation which is crucial for the overall 4-electron reduction of molecular O<SUB>2</SUB> to water, and a key in the observed improvement in the catalytic durability of Acr<SUP>+</SUP>–Mes.</P> <P>Graphic Abstract</P><P>The activity of [(tmpa)Cu<SUP>II</SUP>]<SUP>2+</SUP> complex toward reactive oxygen species elongates the catalytic durability of an organic photocatalyst. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2cp41207a'> </P>
Yamada, Yusuke,Nomura, Akifumi,Miyahigashi, Takamitsu,Ohkubo, Kei,Fukuzumi, Shunichi American Chemical Society 2013 The journal of physical chemistry. A, Molecules, s Vol.117 No.18
<P>The addition of acetate ion to an O<SUB>2</SUB>-saturated mixed solution of acetonitrile and water containing oxalic acid as a reductant and 2-phenyl-4-(1-naphthyl)quinolinium ion (QuPh<SUP>+</SUP>–NA) as a photocatalyst dramatically enhanced the turnover number of hydrogen peroxide (H<SUB>2</SUB>O<SUB>2</SUB>) production. In this photocatalytic H<SUB>2</SUB>O<SUB>2</SUB> production, a base is required to facilitate deprotonation of oxalic acid forming oxalate dianion, which acts as an actual electron donor, whereas a Brønsted acid is also necessary to protonate O<SUB>2</SUB><SUP>•–</SUP> for production of H<SUB>2</SUB>O<SUB>2</SUB> by disproportionation. The addition of acetate ion to a reaction solution facilitates both the deprotonation of oxalic acid and the protonation of O<SUB>2</SUB><SUP>•–</SUP> owing to a pH buffer effect. The quantum yield of the photocatalytic H<SUB>2</SUB>O<SUB>2</SUB> production under photoirradiation (λ = 334 nm) of an O<SUB>2</SUB>-saturated acetonitrile–water mixed solution containing acetate ion, oxalic acid and QuPh<SUP>+</SUP>–NA was determined to be as high as 0.34, which is more than double the quantum yield obtained by using oxalate salt as an electron donor without acetate ion (0.14). In addition, the turnover number of QuPh<SUP>+</SUP>–NA reached more than 340. The reaction mechanism and the effect of solvent composition on the photocatalytic H<SUB>2</SUB>O<SUB>2</SUB> production were scrutinized by using nanosecond laser flash photolysis.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpcafh/2013/jpcafh.2013.117.issue-18/jp312795f/production/images/medium/jp-2012-12795f_0012.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jp312795f'>ACS Electronic Supporting Info</A></P>
Experimental investigation of thermo-optic effects in SiC and Si photonic crystal nanocavities.
Yamada, Shota,Song, Bong-Shik,Asano, Takashi,Noda, Susumu Optical Society of America 2011 Optics letters Vol.36 No.20
<P>We experimentally investigate and compare the thermo-optic effects of silicon carbide (SiC) and silicon (Si) photonic crystal nanocavities on their resonant wavelengths over a temperature range of 25?C to nearly 200?C by using a laser source with a wavelength close to the telecommunication wavelength range of 1550?nm. The measured results clearly show that the shift in the resonant wavelength of the SiC cavity is significantly (by a factor of 3) less than that of the Si cavity for the same ambient temperature changes. In addition, the measured results provide direct estimates of the thermo-optic coefficients (dn/dT) for thin SiC and Si as 3.8710(-5)/C and 1.6010(-4)/C, respectively, for this temperature range.</P>
Yamada, Yusuke,Miyahigashi, Takamitsu,Kotani, Hiroaki,Ohkubo, Kei,Fukuzumi, Shunichi The Royal Society of Chemistry 2012 ENERGY AND ENVIRONMENTAL SCIENCE Vol.5 No.3
<P>Photocatalytic hydrogen evolution with 2-phenyl-4-(1-naphthyl)quinolinium ion (QuPh<SUP>+</SUP>–NA) as a photocatalyst and dihydronicotinamide adenine dinucleotide (NADH) as a sacrificial electron donor has been made possible for the first time by using nickel nanoparticles (NiNPs) as a non-precious metal catalyst. The hydrogen evolution rate with the most active Ni nanoparticles (hexagonal close-packed (<I>hcp</I>) structure, 6.6 nm) examined here was 40% of that with commercially available Pt nanoparticles (2 nm) using the same catalyst weight. The catalytic activity of NiNPs depends not only on their sizes but also on their crystal phases. The hydrogen-evolution rate normalized by the catalyst weight increased as the size of NiNPs becomes smaller, with regard to the crystal phase, the hydrogen-evolution rate of the NiNPs with <I>hcp</I> structure is more than 4 times higher than the rate of the NiNPs with face-centred cubic (<I>fcc</I>) structure of similar size. NiNPs act as the hydrogen-evolution catalyst under the pH conditions between 4.5 and 8.0, although the hydrogen-evolution rate at pH > 7.0 was much lower as compared with the hydrogen-evolution rate at pH 4.5. A kinetic study revealed that the rate of electron transfer from photogenerated QuPh&z.rad;–NA to NiNPs was much higher than the rate of hydrogen evolution, indicating that the rate-determining step may be proton reduction or desorption of hydrogen.</P> <P>Graphic Abstract</P><P>Photocatalytic hydrogen evolution with Ni nanoparticles was achieved for the first time. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2ee03106j'> </P>