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Optical properties of InxAl1−xN film and nanocolumns

Journal of Physics: Conference Series 2009年第1期193卷

作者： Masafumi Hashimoto Jumpei Kamimura Hideyuki Kunugita Kazuhiro Ema Akihiko Kikuchi Katsumi Kishino Department of Engineering and Applied Sciences Sophia University 7-1 Kioi-cho Chiyoda-ku Tokyo 102-8554 Japan Sophia Nanotechnology Research Center Japan Core Research for Evolutional Science and Technology (CREST) Japan Science and Technology Agency Japan

We analyzed photoluminescence (PL) spectra of In-rich InxAl1−xN nanocolumns (NCs; x = 0.80) and film (x = 0.82) using the free-electron recombination to bound (FERB) model. The FERB model fits well to the PL spectra of the In-rich InxAl1−xN film and NCs, which implies that light-emitting properties of In-rich InxAl1−xN are similar to those of InN. We obtained bandgap energies and electron carrier densities from the results of fitting the PL spectra.

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Photo-excited carrier relaxation dynamics in InN films

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Journal of Physics: Conference Series 2009年第1期193卷

作者： Masafumi Hashimoto Kazuya Fukunaga Kazuaki Kouyama Jumpei Kamimura Hideyuki Kunugita Kazuhiro Ema Akihiko Kikuchi Katsumi Kishino Department of Engineering and Applied Sciences Sophia University 7-1 Kioi-cho Chiyoda-ku Tokyo 102-8554 Japan Core Research for Evolutional Science and Technology (CREST) Japan Science and Technology Agency Japan Sophia Nanotechnology Research Center Japan

Photo-excited carrier relaxation dynamics in InN films were investigated using femtosecond transient measurements. We measured two samples with different background carrier densities, and discussed the influence of the carrier densities on the relaxation dynamics. We also found that the slow decay component disappears under the optimized condition because of the effects of equilibrium band filling and bandgap renormalization.

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Human affordance

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International Journal of Web Based Communities 2009年第2期5卷 255-272页

作者： Ihara, Masayuki Kobayashi, Minoru Sakai, Yoshinori Research and Development Department Core Technology and Program Management Division NTT Comware Corporation 1-6 Nakase Mihama-ku Chiba 261-0023 Japan NTT Cyber Solutions Laboratories NTT Corporation 1-1 Hikari-no-oka Yokosuka 239-0847 Japan Department of Communications and Integrated Systems Graduate School of Science and Engineering Tokyo Institute of Technology 2-12-1 Ookayama Meguro-ku Tokyo 152-8550 Japan

Our final goal is to utilise a cognition viewpoint for the engineering of a better design of human communication tools. In this paper, we extend the concept of affordance to cover human-to-human communication and propose the novel concept of 'human affordance', which is afforded from humans, not artefacts. As one possible utilisation of the concept, we introduce the example of affordance in evaluating the strength of agreement/disagreement phrases. In text-based communication, it is important for mutual understanding to effectively afford information about how a person feels about the text itself. This paper presents experimental results on over/underestimation in understanding the strength of agreement/disagreement in text-based communication. The human affordance identified in typical agreement/disagreement phrases is analysed in order to explore how to better augment human affordance in text-based communication. Copyright © 2009, Inderscience Publishers.

关键词： Affordance augmentation Agreement/disagreement Human affordance Over/underestimation Text-based communication

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Second harmonic generation from photonic structured GaN nanowalls

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Journal of Physics: Conference Series 2009年第1期193卷

作者： Takahiro Soya Yuta Inose Hideyuki Kunugita Kazuhiro Ema Kouji Yamano Akihiko Kikuchi Katsumi Kishino Department of Engineering and Applied Sciences Sophia University 7-1 Kioi-cho Chiyoda-ku Tokyo 102-8554 Japan Core Research for Evolutional Science and Technology (CREST) Japan Science and Technology Agency Japan Sophia Nanotechnology Research Center Japan

We observed large enhancement of reflected second harmonic generation (SHG) using the one-dimensional photonic effect in regularly arranged InGaN/GaN single-quantum-well nanowalls. Using the effect when both fundamental and SH resonate with the photonic mode, we obtained enhancement of about 40 times compared with conditions far from resonance.

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Confining Molecules within Aqueous Coordination Nanoparticles by Adaptive Molecular Self‐Assembly†

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Angewandte Chemie 2009年第50期121卷

作者： Ryuhei Nishiyabu Carole Aimé Ryosuke Gondo Takao Noguchi Nobuo Kimizuka Department of Chemistry and Biochemistry Graduate School of Engineering Kyushu University Core Research for Evolutional Science and Technology (CREST) Japan Science and Technology Agency (JST) 744 Moto‐oka Nishi‐ku Fukuoka 819‐0395 (Japan) Fax: (+81) 92‐802‐2839

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Chronic demyelinating polyneuropathy in graft-versus-host disease following allogeneic bone marrow transplantation

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Neuropathology 2009年第1期22卷

作者： Toshiko Nagashima Fumie Sato Takayo Chuma Yukio Mano Isao Sasaki Masamitsu Mori Toshio Higa Nobuo Masauji Masaharu Kasai Yasuko Orba Toshiya Shinohara Kazuo Nagashima Departments ofNeurology Department of Rehabilitation Medicine and Orthopedics Haematology and Department of Haematology Sapporo Hokuyu Hospital Sapporo and Pathology Teine Keijinkai Hospital Laboratory of Molecular and Cellular Pathology Hokkaido University School of Medicine CREST (Core Research for Evolutional Science and Technology) Japan Science and Technology Japan

In recent years a novel problem has arisen in organ transplantation medicine, namely GVHD. The nervous system has been involved mainly at the level of the CNS and this can lead to a serious outcome for the patient. In rare cases, peripheral nerves may be affected and show acute or chronic polyneuropathy. Here a case is reported of polyneuropathy associated with chronic GVHD. A 32-year-old man, suffering from chronic GVHD following an allogeneic bone marrow transplantation (BMT) for malignant lymphoma at the age of 25, developed a motor dominant polyneuropathy 5 years later. Electrophysiologic studies demonstrated the demyelinating type of polyneuropathy. Biopsy specimens from skin and skeletal muscle disclosed perivascular lymphocytic infiltrates expressing T-cell markers. The sural nerve showed a loss of myelinated nerve fibers with epineurial fibrosis and rare occurrence of T cells, but without obvious vasculitic changes. The present case suggested that polyneuropathy could develop in association with chronic GVHD in some patients with a longstanding disease course.

关键词： bone marrow transplantation chronic graft-versus-host disease demyelination polyneuropathy

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Possible dose-side effect relationship of antipsychotic drugs: Relevance to cognitive function in schizophrenia

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Expert Review of Clinical Pharmacology 2008年第6期1卷 791-802页

作者： Sumiyoshi, Tomiki Core Research for Evolutional Science and Technology Japan Science and Technology Corporation Tokyo Japan Department of Neuropsychiatry University of Toyama Graduate School of Medicine and Pharmaceutical Sciences Toyama 930-0194 2630 Sugitani Japan

Management of adverse events is a major concern of clinicians who use antipsychotic drugs. The incidence of motor side effects is dose dependent. Atypical antipsychotic drugs are less likely to induce neurologic side effects compared with typical (conventional) antipsychotics, such as haloperidol. Some recent, large-scale studies have shown that the incidence of metabolic side effects often associated with atypical agents does not differ among typical and atypical antipsychotics. Cognitive function, such as verbal learning memory, working memory, executive function, verbal fluency and attention/ information processing, is the most influential determinant of outcome in patients with schizophrenia. Atypical antipsychotic drugs have been shown to be more efficacious in treating cognitive disturbances of schizophrenia compared with typical antipsychotic drugs. Serotonin (5-hydroxytryptamine [5-HT]) receptor subtypes, such as the 5-HT1A receptor, are considered to mediate the ability of antipsychotic drugs to enhance cognition. On the other hand, treatment with some atypical agents, such as risperidone, may deteriorate working memory in some people with early-stage schizophrenia. The paradoxical side effects of these antipsychotic drugs in terms of cognition may be attributable to dose, duration of treatment and type of cognitive domain. Further research will add to the worldwide endeavor to develop more effective psychotropic drugs accompanied with minimal side effects, for the improvement of cognition, adherence and long-term outcome in patients with schizophrenia or other major psychiatric illnesses. © 2008 Expert Reviews Ltd.

关键词： 5-HT1A receptor Atypical antipsychotic drug Cognition Dose dependence Extrapyramidal sign Schizophrenia Serotonin receptor Typical antipsychotic drug

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A fungal cytochrome P-450nor confers denitrifying ability to tobacco BY-2 cells

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Biotechnology 2008年第2期7卷 250-257页

作者： Abdel-Banat, Babiker M.A. Adam, Suaad E.H. Takahashi, Misa Sakamoto, Atsushi Shoun, Hirofumi Morikawa, Hiromichi Department of Mathematical and Life Science Graduate School of Science Hiroshima University Kagamiyama 1-3-1 Higashi-Hiroshima 739-8526 Japan Core Research for Evolutional Science and Technology Japan Science and Technology Corporation Kawaguchi 332-0012 Japan Department of Biotechnology University of Tokyo Tokyo 113-8657 Japan

Reactive nitrogen gases progressively contribute to the global warming. Development of gas-gas denitrifying plants that can efficiently reduce reactive nitrogen gases to dinitrogen (N2) could help to mitigate the effect of these gases. Taking the advances in gene manipulation technology, tobacco BY-2 cells were transformed with the fungus Cylindrocarpon tonkinense cytochrome P-450nor2 (Cnor2) gene. The product of this gene acts as nitric oxide reductase (nor). Transgenic BY-2 cell clones cultured in 15N-labelled nitrate (15NO-3) actively evolved 15N 2O gas up to 35-folds compared to the wild-type cells. In 15N-labelled ammonium (15NH+4), the transgenic and wild-type cells produced comparable amounts of 15N2O. This indicates that ammonium is not a direct substrate for nor and the small amount of N2O observed may be due to the nitrification of ammonium to nitrite. Addition of tungstate (a nitrate reductase inhibitor) and cyanide to the transgenic cell cultures strongly inhibited 15N2O production. Activity of nor enzyme was also confirmed by in vitro activity assay. These observations together suggest that Cnor2 is actively expressed and enhanced the reduction of nitrate to N 2O in plant cells. This finding indicates that plant cells are capable to tackle the denitrification pathway. © 2008 Asian Network for Scientific Information.

关键词： Nitrogen oxides

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A 648-pixel, two-dimension spatial light modulator with an over-two-octave bandwidth from ultraviolet to near-infrared

A 648-pixel, two-dimension spatial light modulator with an o...

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Conference on Lasers and Electro-Optics, CLEO 2008

作者： Hazu, K. Nakagawa, N. Fang, Sh. B. Nakano, Y. Sekikawa, T. Yamashita, M. Department of Applied Physics Hokkaido University Core Research for Evolutional Science and Technology Japan Science and Technology Agency Kita-13 Nishi-8 Kita-ku Sapporo 060-8628 Japan

ISBN: (纸本)9781557528599

关键词： Light modulators

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Coherent and incoherent d band dispersions in SrVO3

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Physical Review B 2009年第23期80卷 235104-235104页

作者： M. Takizawa M. Minohara H. Kumigashira D. Toyota M. Oshima H. Wadati T. Yoshida A. Fujimori M. Lippmaa M. Kawasaki H. Koinuma G. Sordi M. Rozenberg Department of Physics University of Tokyo Bunkyo-ku Tokyo 113-0033 Japan Graduate School of Arts and Sciences University of Tokyo 3-8-1 Komaba Meguro-ku Tokyo 153-8902 Japan Department of Applied Chemistry University of Tokyo Bunkyo-ku Tokyo 113-8656 Japan Core Research for Evolutional Science and Technology Japan Science and Technology Agency (JSTCREST) Chiyoda-ku Tokyo 102-0075 Japan Institute for Solid State Physics University of Tokyo 5-1-5 Kashiwanoha Kashiwashi Chiba 277-8581 Japan Institute for Materials Research Tohoku University 2-1-1 Katahira Aoba-ku Sendai Miyagi 980-8577 Japan Materials and Structures Laboratory Tokyo Institute of Technology 4259 Nagatsuta Midori-ku Yokohama Kanagawa 226-8503 Japan Departamento de Física FCEN Universidad de Buenos Aires Ciudad Universitaria Pabellón I 1428 Buenos Aires Argentina

We have performed an angle-resolved photoemission spectroscopy study of SrVO3 thin films. Utilizing thin films prepared in situ, with well-defined and atomically flat surfaces, contributions from surface states centered at ∼−1.5 eV were dramatically reduced, enabling us to study the bulklike V 3d states, including the incoherent part. A clear band dispersion is observed not only in the coherent part but also in the incoherent part and the spectral weight of the incoherent part is larger within the Fermi volume. These findings are particularly significant since the description of the so-called incoherent Hubbard band in SrVO3 needs to include the nonlocal interaction between the atoms. These trends are well reproduced by dynamical mean-field theory calculations.

关键词： electronic structure Hubbard model metal-insulator transition photoelectron spectra pulsed laser deposition strontium compounds surface states thin films

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