132 results on '"Hiroyuki Miya"'
Search Results
2. Assessment of the renal function of patients with anorexia nervosa
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Hiroyuki Miyahara, Yoshie Shigeyasu, Chikako Fujii, Chie Tanaka, Mana Hanzawa, Akiko Sugihara, Ayumi Okada, and Hirokazu Tsukahara
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Anorexia nervosa ,Dehydration ,Glomerular filtration rate estimated using creatinine ,Glomerular filtration rate estimated using cystatin-C ,Hypokalemia ,Low free triiodothyronine syndrome ,Neurosciences. Biological psychiatry. Neuropsychiatry ,RC321-571 - Abstract
Abstract Background A decreased glomerular filtration rate (GFR), estimated using creatinine (Cr– eGFR), is often found at the initial presentation of anorexia nervosa (AN). Its pathophysiology has been explained mainly by dehydration, and chronic hypokalemia is also thought to be a cause. However, because we have often experienced cases of AN with decreased Cr-eGFR without these conditions, we must consider different etiologies. The focus of this paper is on low free triiodothyronine (FT3) syndrome. We also discuss the utility of eGFR, estimated using cystatin-C (CysC-eGFR), for these patients. Methods The data of 39 patients diagnosed with AN between January 2005 and December 2023 was available for study. The characteristics of patients at the lowest and highest body mass index standard deviation score (BMI-SDS) were examined. Data on the parameters Cr-eGFR, CysC-eGFR, dehydration markers, potassium (K), and hormonal data and BMI-SDS were assessed during the treatment course to evaluate the correlations in these parameters. Blood hematocrit, uric acid (UA), blood urine nitrogen (BUN) level, and urine specific gravity were adopted as dehydration markers; FT3, free thyroxine, thyroid stimulating hormone, and insulin-like growth factor were adopted as hormonal data. Cr-eGFR and simultaneously evaluated dehydration markers, K, or hormonal data were extracted and correlations associated with the changes in BMI-SDS were examined. Furthermore, Cr-eGFR and simultaneously assessed CysC-eGFR were compared. Results When the BMI-SDS was at the lowest value, low-FT3 syndrome was shown. Severe hypokalemia was not found in our study. A linear relation was not found between Cr-eGFR and BMI-SDS. A statistically significant correlation was found between Cr-eGFR and FT3 (p = 0.0025). Among the dehydration markers, statistically significant correlations were found between Cr-eGFR and BUN or UA. The difference between Cr-eGFR and CysC-eGFR was prominent, and CysC-eGFR showed much higher values. Conclusions Our data indicates that low-FT3 syndrome and dehydration were related to the renal function of our patients with AN. Furthermore, our data suggest that caution is needed in the interpretation of kidney function evaluation when using CysC-eGFR in cases of AN.
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- 2024
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3. Effect of hyperuricemia on paroxysmal atrial fibrillation after catheter ablation and influence of alcohol consumption
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Kazuki Shimojo, Itsuro Morishima, Yasuhiro Morita, Yasunori Kanzaki, Hiroyuki Miyazawa, Naoki Watanabe, Naoki Yoshioka, Naoki Shibata, Yoshihito Arao, Ryota Yamauchi, Takuma Ohi, Hiroki Goto, Hoshito Karasawa, and Kenji Okumura
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alcohol consumption ,atrial fibrillation ,catheter ablation ,hyperuricemia ,uric acid ,Diseases of the circulatory (Cardiovascular) system ,RC666-701 - Abstract
Abstract Background Evidence regarding the association between hyperuricemia and arrhythmia recurrence after catheter ablation for paroxysmal atrial fibrillation (AF) is scarce. We investigated whether hyperuricemia predicts arrhythmia recurrence after catheter ablation for paroxysmal AF and the relationship between hyperuricemia and alcohol consumption in AF recurrence. Methods Patients who underwent catheter ablation for paroxysmal AF were divided into the hyperuricemia (index serum uric acid [UA] >7.0 mg/dL; n = 114) and control (UA ≤7.0 mg/dL; n = 609) groups and were followed for a median of 24 (12–48) months after ablation. Results The hyperuricemia group had more patients with an alcohol intake of ≥20 g/day (33.3% vs. 22.7%, p = .017) and a lower incidence of AF‐free survival (p = .019). Similarly, those with an alcohol intake of ≥20 g/day had a lower incidence of AF‐free survival than other patients. Multivariate Cox regression analysis revealed the following independent predictors of AF recurrence (adjusted hazard ratio, 95% confidence interval): hyperuricemia (1.64, 1.12–2.40), female gender (1.91, 1.36–2.67), brain natriuretic peptide level >100 pg/mL (1.59, 1.14–2.22), and alcohol consumption ≥20 g/day (1.49, 1.03–2.15) (all p
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- 2024
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4. An extremely wide QRS complex tachycardia induced by anamorelin
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Kazuki Shimojo, Yasunori Kanzaki, Hiroyuki Miyazawa, and Itsuro Morishima
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anamorelin ,mimicking ventricular tachyarrhythmia ,sodium channel blockade ,supraventricular tachyarrhythmia ,wide QRS complex ,Diseases of the circulatory (Cardiovascular) system ,RC666-701 - Published
- 2024
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5. Trabecular bone scores in children with osteogenesis imperfecta respond differently to bisphosphonate treatment depending on disease severity
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Natsuko Futagawa, Kosei Hasegawa, Hiroyuki Miyahara, Hiroyuki Tanaka, and Hirokazu Tsukahara
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bone density ,osteoporosis ,bone diseases ,connective tissue ,child ,Pediatrics ,RJ1-570 - Abstract
IntroductionOsteogenesis imperfecta (OI) is a congenital skeletal disorder characterized by bone fragility. Bisphosphonates (BISs) have become the mainstream treatment in children with OI. However, an optimal treatment protocol has not yet been established, while BIS treatment tends to be administered to normalize bone mineral density (BMD). Bone quality is an important component of bone strength. The trabecular bone score (TBS) is a quantitative measure of the microstructure that affects bone quality. This study investigated the TBS during BIS treatment in children with OI.Materials and methodsTwenty-nine children with OI were enrolled and classified into two groups: mild (type 1) and moderate to severe (types 3 and 4). Dual-energy x-ray absorptiometry images were retrospectively analyzed for TBS calculation. The relationship between the areal BMD (aBMD), its Z-score, height-adjusted BMD (BMDHAZ) Z-score, TBS, and TBS Z-score with the treatment duration was assessed for each group.ResultsIn the mild group, the aBMD, its Z-score, and BMDHAZ Z-score showed a significant positive correlation with treatment duration (r = 0.68, 0.68, 0.72, respectively, p
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- 2024
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6. High-spin states in S35
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Shoji Nakamura, Yosuke Toh, K. Kisamori, Yuichi Hatsukawa, F. Azaiez, Yutaka Utsuno, I. Matea, Shin'ichiro Michimasa, Megumi Niikura, Ayumi Yagi, Mitsuo Koizumi, Rin Yokoyama, Hideo Harada, M. Sugawara, Daisuke Suzuki, Motoki Kobayashi, Nori Aoi, Kazuyoshi Furutaka, Noritaka Shimizu, D. Verney, Hiroki Nishibata, Hiroyuki Miya, Susumu Shimoura, T. Shizuma, Eiji Ideguchi, Motonobu Takaki, Shintaro Go, A. Kimura, and Fumito Kitatani
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Physics ,Spin states ,Condensed matter physics ,010308 nuclear & particles physics ,0103 physical sciences ,010306 general physics ,01 natural sciences - Published
- 2021
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7. Robust Human Activity Recognition for Intelligent Transportation Systems Using Smartphone Sensors: A Position-Independent Approach
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John Benedict Lazaro Bernardo, Attaphongse Taparugssanagorn, Hiroyuki Miyazaki, Bipun Man Pati, and Ukesh Thapa
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position independence ,human activity recognition ,multi-sensor data ,nested cross-validation ,random forest ,XGBoost ,Technology ,Engineering (General). Civil engineering (General) ,TA1-2040 ,Biology (General) ,QH301-705.5 ,Physics ,QC1-999 ,Chemistry ,QD1-999 - Abstract
This study explores Human Activity Recognition (HAR) using smartphone sensors to address the challenges posed by position-dependent datasets. We propose a position-independent system that leverages data from accelerometers, gyroscopes, linear accelerometers, and gravity sensors collected from smartphones placed either on the chest or in the left/right leg pocket. The performance of traditional machine learning algorithms (Decision Trees (DT), K-Nearest Neighbors (KNN), Random Forest (RF), Support Vector Classifier (SVC), and XGBoost) is compared against deep learning models (Gated Recurrent Unit (GRU), Long Short-Term Memory (LSTM), Temporal Convolutional Networks (TCN), and Transformer models) under two sensor configurations. Our findings highlight that the Temporal Convolutional Network (TCN) model consistently outperforms other models, particularly in the four-sensor non-overlapping configuration, achieving the highest accuracy of 97.70%. Deep learning models such as LSTM, GRU, and Transformer also demonstrate strong performance, showcasing their effectiveness in capturing temporal dependencies in HAR tasks. Traditional machine learning models, including RF and XGBoost, provide reasonable performance but do not match the accuracy of deep learning models. Additionally, incorporating data from linear accelerometers and gravity sensors led to slight improvements over using accelerometer and gyroscope data alone. This research enhances the recognition of passenger behaviors for intelligent transportation systems, contributing to more efficient congestion management and emergency response strategies.
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- 2024
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8. Mapping of a New Deformation Region Around Ti62
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DeukSoon Ahn, Tatsuya Furuno, Hiroyuki Miya, G. P. A. Berg, Andreas Stolz, Susumu Shimoura, A. Mizukami, Kenichi Yoshida, Eiji Ideguchi, Hideyuki Sakai, Motonobu Takaki, H. Takeda, Y. Yanagisawa, Shin'ichiro Michimasa, Shuichi Ota, H. Nagakura, Naoki Fukuda, Yuya Kubota, Masafumi Matsushita, H. Oikawa, Toshiyuki Kubo, Takeo Kawabata, Hiroshi Suzuki, Tomohiro Uesaka, Satoshi Takeuchi, Shoichiro Kawase, Masanori Dozono, K. Kobayashi, R. Yokoyama, Y. Kiyokawa, Y. L. Yamaguchi, Y. Shimizu, H. Baba, D. Nishimura, Kentaro Yako, C. S. Lee, Hiroshi Tokieda, K. Kisamori, Naohito Inabe, and Motoki Kobayashi
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Materials science ,Isotope ,chemistry ,Neutron number ,Isotopes of vanadium ,Analytical chemistry ,General Physics and Astronomy ,chemistry.chemical_element ,Scandium ,Deformation (engineering) ,Beam (structure) ,Atomic mass ,Titanium - Abstract
We performed the first direct mass measurements of neutron-rich scandium, titanium, and vanadium isotopes around the neutron number 40 at the RIKEN RI Beam Factory using the time-of-flight magnetic-rigidity technique. The atomic mass excesses of ^{58-60}Sc, ^{60-62}Ti, and ^{62-64}V were measured for the first time. The experimental results show that the two-neutron separation energies in the vicinity of ^{62}Ti increase compared to neighboring nuclei. This shows that the masses of Ti isotopes near N=40 are affected by the Jahn-Teller effect. Therefore, a development of Jahn-Teller stabilization appears below the Cr isotopes, and the systematics in Sc, Ti, and V isotopes suggest that ^{62}Ti is located close to the peak of the Jahn-Teller effect.
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- 2020
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9. How Different is the Core of F25 from Og.s.24 ?
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W. Kim, Rin Yokoyama, K. Kisamori, S. S. Stepanyan, T. Kawahara, Naoki Fukuda, Tomohiro Uesaka, Hiroyuki Miya, D. Kameda, Kenichi Yoshida, Takashi Kubo, Shuichi Ota, Susumu Shimoura, Motonobu Takaki, Yukie Maeda, Hideyuki Sakai, A. Galindo-Uribarri, Kazuyuki Ogata, Shin'ichiro Michimasa, Tomotsugu Wakasa, Sanghoon Hwang, J. Yasuda, T. L. Tang, Yuya Kubota, Hiroshi Tokieda, Masanori Dozono, Kensuke Kusaka, Juzo Zenihiro, T. Fukunaga, Hiroshi Matsubara, Y. Yanagisawa, Didier Beaumel, Elizabeth Padilla-Rodal, A. Obertelli, Naohito Inabe, Hiroyuki Takeda, Motoki Kobayashi, C. S. Lee, T. Fujii, Takashi Wakui, Kentaro Yako, Tetsuo Noro, Satoshi Sakaguchi, Shoichiro Kawase, Masaki Sasano, and Hiroshi Suzuki
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Physics ,Proton ,010308 nuclear & particles physics ,General Physics and Astronomy ,01 natural sciences ,3. Good health ,Core (optical fiber) ,Crystallography ,medicine.anatomical_structure ,Excited state ,0103 physical sciences ,medicine ,Neutron ,Anomaly (physics) ,010306 general physics ,Ground state ,Nuclear theory ,Nucleus - Abstract
The structure of a neutron-rich ^{25}F nucleus is investigated by a quasifree (p,2p) knockout reaction at 270A MeV in inverse kinematics. The sum of spectroscopic factors of π0d_{5/2} orbital is found to be 1.0±0.3. However, the spectroscopic factor with residual ^{24}O nucleus being in the ground state is found to be only 0.36±0.13, while those in the excited state is 0.65±0.25. The result shows that the ^{24}O core of ^{25}F nucleus significantly differs from a free ^{24}O nucleus, and the core consists of ∼35% ^{24}O_{g.s.}. and ∼65% excited ^{24}O. The result may infer that the addition of the 0d_{5/2} proton considerably changes neutron structure in ^{25}F from that in ^{24}O, which could be a possible mechanism responsible for the oxygen dripline anomaly.
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- 2020
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10. Development of a neutron detector with a high position resolution at intermediate energies
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Tomotsugu Wakasa, Masanori Dozono, T. L. Tang, Tomohiro Uesaka, T. Taguchi, Hiroshi Tokieda, Tatsushi Shima, K. Miki, M. Itoh, Yuya Kubota, Y. Ono, Hiroyuki Miya, Hiroaki Matsubara, J. Yasuda, Juzo Zenihiro, Shuichi Ota, C. S. Lee, Takashi Wakui, Motoki Kobayashi, Kimiko Sekiguchi, Masaki Sasano, and Shoichiro Kawase
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Physics ,Nuclear and High Energy Physics ,Photomultiplier ,Proton ,Physics::Instrumentation and Detectors ,010308 nuclear & particles physics ,business.industry ,020209 energy ,Resolution (electron density) ,Cyclotron ,Detector ,02 engineering and technology ,01 natural sciences ,law.invention ,Optics ,law ,0103 physical sciences ,0202 electrical engineering, electronic engineering, information engineering ,Neutron detection ,Neutron ,Nuclear Experiment ,business ,Instrumentation ,Beam (structure) - Abstract
A high position resolution neutron detector for time-of-flight measurements is being developed to measure the ( p , p n ) reaction in inverse kinematics with an excitation energy resolution of 1 MeV at the RIKEN RI Beam Factory. In this study, a new method based on the segmentation of the neutron detector part is employed to achieve a position resolution on the order of mm with a prototype neutron detector. The prototype detector consists of 8 × 8 scintillating fibers, two multi-anode photomultiplier tubes (PMTs) and two light guides. The scintillating fibers have a cross sectional area of 3 . 75 × 3 . 75 mm 2 . The prototype’s performance is studied using the neutron and proton beams provided at the Cyclotron and Radioisotope Center (CYRIC), Tohoku University and the Research Center for Nuclear Physics (RCNP), Osaka University. It is confirmed that the hit pattern analysis correctly recognizes the neutron detection position within the fiber size of 3.75 mm. The obtained TOF resolution of 350 ps (FWHM), lateral position resolution of 2.5 mm (FWHM), and longitudinal position resolution of 50–60 mm (FWHM) satisfy the requirements to achieve an excitation energy resolution of 1 MeV. The typical detection efficiency is ∼ 2.0% for a neutron with a kinetic energy of 50–200 MeV. The detailed investigation of the detection efficiency in conjunction with the neutron hit position reveals the existence of the non-uniformity of the efficiency. It is shown that the non-uniformity can be mitigated by reducing the threshold level, and by increasing the detector size. For a larger neutron detector, based on the design of the prototype detector, the non-uniformity will thus be negligible.
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- 2019
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11. Non‐nodal mantle cell lymphoma mimicking hairy cell leukemia
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Yuma Nato, Keiki Nagaharu, Hiroshi Imai, and Hiroyuki Miyashita
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clinical hematology ,hairy cytoplasmic projections ,NGS ,non‐nodal mantle cell lymphoma ,Medicine ,Medicine (General) ,R5-920 - Abstract
Key Clinical Message This case of non‐nodal mantle cell lymphoma (MCL) showcases atypical hairy cell‐like features, distinguishing it via next‐generation sequencing. Despite a TP53 mutation indicating poor prognosis, our case followed an indolent course, highlighting the importance of genetic testing and phenotypical examination in MCL.
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- 2024
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12. Prenylflavonoids isolated from Epimedii Herba show inhibition activity against advanced glycation end-products
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Keisuke Nakashima, Hiroyuki Miyashita, Hitoshi Yoshimitsu, Yukio Fujiwara, Ryoji Nagai, and Tsuyoshi Ikeda
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Epimedii Herba ,prenylflavonoid ,advanced glycation end products ,N ε -(carboxymethyl)lysine ,N ω -(carboxymethyl) arginine ,Chemistry ,QD1-999 - Abstract
Introduction: As inhibitors of advanced glycation end products (AGEs), such as pyridoxamine, significantly inhibit the development of retinopathy and neuropathy in rats with streptozotocin-induced diabetes, treatment with AGE inhibitors is believed to be a potential strategy for the prevention of aging, age-related diseases, and lifestyle-related diseases, including diabetic complications. In the present study, the MeOH extract of Epimedii Herba (EH; aerial parts of Epimedium spp.) was found to inhibit the formation of Nε-(carboxymethyl)lysine (CML) and Nω-(carboxymethyl) arginine (CMA) during the incubation of collagen-derived gelatin with ribose.Materials and methods: EH was purchased from Uchida Wakan-yaku Co., and a MeOH extract was prepared. Several steps of column chromatography purified the extract. Each fraction was tested for inhibitory activity by ELISA using monoclonal antibodies for CML and CMA.Results: After activity-guided fractionation and purification by column chromatography, three new prenylflavonoids [named Koreanoside L (1), Koreanoside E1 (2), and Koreanoside E2 (3)] and 40 known compounds (4–43) were isolated from EH, and their inhibitory effects against CML and CMA formation were tested. Among these, epimedokoreanin B (8), epimedonin E (21), epicornunin B (22), and epicornunin F (24) inhibited the formation of both CML and CMA, with epimedokoreanin B (8) having the most potent inhibitory effect among the isolated compounds. To obtain the structure–activity relationships of 8, the phenolic hydroxy groups of 8 were methylated by trimethylsilyl-diazomethane to afford the partially and completely methylated compounds of 8. Prenyl derivatives of propolis (artepillin C, baccharin, and drupanin) were used in the assay.Discussion: As only 8 showed significant activity among these compounds, the catechol group of the B ring and the two prenyl groups attached to the flavanone skeleton were essential for activity. These data suggest that 8 could prevent the clinical complications of diabetes and age-related diseases by inhibiting AGEs.
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- 2024
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13. Enhanced Spatiotemporal Heatwave Analysis in Urban and Nonurban Thai Environments Through Integration of In-Situ and Remote Sensing Data
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Thitimar Chongtaku, Attaphongse Taparugssanagorn, Hiroyuki Miyazaki, and Takuji W. Tsusaka
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Air temperature ,geo-climatic hazards ,heatwaves detection ,land surface temperature ,spatial big data processing ,Ocean engineering ,TC1501-1800 ,Geophysics. Cosmic physics ,QC801-809 - Abstract
Facing the escalating global challenge of frequent and severe heatwaves, this study meticulously assesses heatwave dynamics across urban and nonurban areas in central Thailand. It introduces a novel workflow integrating ground-based observations with satellite-derived land surface temperature data over 39 years (1981–2019). Our findings reveal a significant increase in daytime heatwaves in urban and peri-urban areas, with notable rises in the number, frequency, duration, and amplitude of heatwaves. Conversely, nighttime heatwaves intensify mainly in rural areas. Land surface temperature data show distinct patterns: peri-urban regions experience significant daytime increases in heatwave magnitude, amplitude, and frequency, contrasting with varied trends in urban and rural settings. The annual pattern of heatwave characteristics across specific regions reveals that daytime occurrences are more frequent and intense in peri-urban zones such as Pathum Thani and eastern Bangkok, with annual episodes ranging from 2 to 9 and durations of 10 to 39 days. In contrast, urban areas such as downtown Bangkok are more prone to nighttime heatwaves, with a wider occurrence range of 3 to 12 events and longer durations, lasting from 13 to 62 days annually. Overall, this research advances traditional methods by offering a nuanced view of heatwave dynamics and highlighting the potential of remote sensing to identify risk areas. The study demonstrates how this precise technique can identify extreme weather events and support sustainable climate practices, government policy, and decision-making, all of which are crucial for enhancing resilience and addressing the growing threat of heat-related health risks.
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- 2024
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14. Aurora B Inhibitor TAK-901 Synergizes with BCL-xL Inhibition by Inducing Active BAX in Cancer Cells
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Hiroyuki Miya, Jennifer Matuszkiewicz, Saomi Murai, Ron de Jong, and Yuumi Okuzono
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0301 basic medicine ,Cancer Research ,Cell ,bcl-X Protein ,Aurora inhibitor ,Aurora B kinase ,Bcl-xL ,Synthetic lethality ,Transfection ,03 medical and health sciences ,Cell Line, Tumor ,Neoplasms ,medicine ,Aurora Kinase B ,Humans ,Sulfones ,RNA, Small Interfering ,Protein Kinase Inhibitors ,bcl-2-Associated X Protein ,biology ,Apoptosis Regulator ,Cancer ,Drug Synergism ,General Medicine ,HCT116 Cells ,medicine.disease ,Cell biology ,030104 developmental biology ,medicine.anatomical_structure ,Oncology ,Gene Knockdown Techniques ,Cancer cell ,biology.protein ,HT29 Cells ,Carbolines - Abstract
Background: Aurora B kinase plays an essential role in chromosome segregation and cytokinesis, and is dysregulated in many cancer types, making it an attractive therapeutic target. TAK-901 is a potent aurora B inhibitor that showed efficacy in both in vitro and in vivo oncology models. Materials and Methods: We conducted a synthetic lethal siRNA screening to identify the genes that, when silenced, can potentiate the cell growth-inhibitory effect of TAK-901. Results: B-cell lymphoma-extra large (BCL-xL) depletion by siRNA or chemical inhibition synergized with TAK-901 in cancer cell lines. As a mechanism of synthetic lethality, active BCL2 associated X, apoptosis regulator (BAX) was induced by TAK-901. BCL-xL protected cells from BAX-dependent apoptosis induction. Therefore, TAK-901 sensitizes cancer cells to BCL-xL inhibition. Conclusion: Polyploid cells induced by TAK-901 are vulnerable to BCL-xL inhibition. Our findings may have an impact on combination strategies with aurora B inhibitors in clinical studies.
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- 2017
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15. Correction: Assessment of the renal function of patients with anorexia nervosa
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Hiroyuki Miyahara, Yoshie Shigeyasu, Chikako Fujii, Chie Tanaka, Mana Hanzawa, Akiko Sugihara, Ayumi Okada, and Hirokazu Tsukahara
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Neurosciences. Biological psychiatry. Neuropsychiatry ,RC321-571 - Published
- 2024
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16. Open Data-Driven 3D Building Models for Micro-Population Mapping in a Data-Limited Setting
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Kittisak Maneepong, Ryota Yamanotera, Yuki Akiyama, Hiroyuki Miyazaki, Satoshi Miyazawa, and Chiaki Mizutani Akiyama
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urban population mapping ,building height estimation ,building use classification ,machine learning ,Science - Abstract
Urban planning and management increasingly depend on accurate building and population data. However, many regions lack sufficient resources to acquire and maintain these data, creating challenges in data availability. Our methodology integrates multiple data sources, including aerial imagery, Points of Interest (POIs), and digital elevation models, employing Light Gradient Boosting Machine (LightGBM) and Gradient Boosting Decision Tree (GBDT) to classify building uses and morphological filtration to estimate heights. This research contributes to bridging the gap between data needs and availability in resource-constrained urban environments, offering a scalable solution for global application in urban planning and population mapping.
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- 2024
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17. Magic Nature of Neutrons in Ca54 : First Mass Measurements of Ca55–57
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Y. Shimizu, Susumu Shimoura, Masafumi Matsushita, Eiji Ideguchi, Yuya Kubota, K. Kobayashi, Andreas Stolz, H. Baba, Hiroshi Tokieda, Naoki Fukuda, R. Yokoyama, Y. L. Yamaguchi, Hideyuki Sakai, Takeo Kawabata, Kentaro Yako, Toshiyuki Kubo, Daiki Nishimura, Tomohiro Uesaka, Tatsuya Furuno, Y. Yanagisawa, Shuichi Ota, H. Nagakura, DeukSoon Ahn, Kenichi Yoshida, Motoki Kobayashi, C. S. Lee, K. Kisamori, Hiroyuki Miya, A. Mizukami, Motonobu Takaki, H. Oikawa, Masanori Dozono, H. Takeda, Shin'ichiro Michimasa, Naohito Inabe, Hiroshi Suzuki, Satoshi Takeuchi, Shoichiro Kawase, Y. Kiyokawa, and G. P. A. Berg
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Physics ,010308 nuclear & particles physics ,Band gap ,Astrophysics::High Energy Astrophysical Phenomena ,Nuclear Theory ,General Physics and Astronomy ,01 natural sciences ,Atomic mass ,Isotopes of calcium ,Atomic orbital ,Neutron number ,0103 physical sciences ,Neutron ,MAGIC (telescope) ,Atomic physics ,Nuclear Experiment ,010306 general physics - Abstract
We perform the first direct mass measurements of neutron-rich calcium isotopes beyond neutron number 34 at the RIKEN Radioactive Isotope Beam Factory by using the time-of-flight magnetic-rigidity technique. The atomic mass excesses of ^{55-57}Ca are determined for the first time to be -18650(160), -13510(250), and -7370(990) keV, respectively. We examine the emergence of neutron magicity at N=34 based on the new atomic masses. The new masses provide experimental evidence for the appearance of a sizable energy gap between the neutron 2p_{1/2} and 1f_{5/2} orbitals in ^{54}Ca, comparable to the gap between the neutron 2p_{3/2} and 2p_{1/2} orbitals in ^{52}Ca. For the ^{56}Ca nucleus, an open-shell property in neutrons is suggested.
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- 2018
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18. Excitation of the Isovector Spin Monopole Resonance via the Exothermic Zr90(N12,C12) Reaction at 175 MeV/u
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Naoki Fukuda, Y. Yanagisawa, Remco Zegers, Kenichi Yoshida, Tomohiro Uesaka, Hiroaki Matsubara, Satoshi Sakaguchi, Shin'ichiro Michimasa, G. P. A. Berg, Naohito Inabe, H. W. Wang, Shoichiro Kawase, Kenjiro Miki, Shumpei Noji, Motonobu Takaki, Yukie Maeda, Hiroyuki Takeda, Hiroshi Tokieda, Nori Aoi, Masanori Dozono, K. Yako, N. Yokota, Toshiyuki Kubo, Y. Kikuchi, K. Kisamori, Satoshi Takeuchi, D. Kameda, Yoshiko Sasamoto, Takeo Kawabata, Hiroyuki Miya, Shuichi Ota, P. Doornenbal, Hideyuki Sakai, Susumu Shimoura, Tsuyoshi Ohnishi, H. Baba, and H. Miyasako
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Exothermic reaction ,Physics ,Isovector ,010308 nuclear & particles physics ,Nuclear Theory ,Magnetic monopole ,General Physics and Astronomy ,Resonance ,Nuclear matter ,01 natural sciences ,Spectral line ,0103 physical sciences ,Atomic physics ,Nuclear Experiment ,010306 general physics ,Spin (physics) ,Excitation - Abstract
The (^{12}N, ^{12}C) charge-exchange reaction at 175 MeV/u was developed as a novel probe for studying the isovector spin giant monopole resonance (IVSMR), whose properties are important for better understanding the bulk properties of nuclei and asymmetric nuclear matter. This probe, now available through the production of ^{12}N as a secondary rare-isotope beam, is exothermic, is strongly absorbed at the surface of the target nucleus, and provides selectivity for spin-transfer excitations. All three properties enhance the excitation of the IVSMR compared to other, primarily light-ion, probes, which have been used to study the IVSMR thus far. The ^{90}Zr(^{12}N,^{12}C) reaction was measured and the excitation energy spectra up to about 70 MeV for both the spin-transfer and non-spin-transfer channels were deduced separately by tagging the decay by γ emission from the ^{12}C ejectile. Besides the well-known Gamow-Teller and isobaric analog transitions, a clear signature of the IVSMR was identified. By comparing with the results from light-ion reactions on the same target nucleus and theoretical predictions, the suitability of this new probe for studying the IVSMR was confirmed.
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- 2018
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19. Spectroscopy of Pionic Atoms in Sn122(d,He3) Reaction and Angular Dependence of the Formation Cross Sections
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Hiroaki Matsubara, Yasumoto Tanaka, Kenjiro Miki, M. Iwasaki, N. Ikeno, Ryugo S. Hayano, Hiroyuki Fujioka, Shumpei Noji, Naoki Fukuda, Shoichiro Kawase, Shin'ichiro Michimasa, Shigeru Itoh, Tomohiro Uesaka, K. Tsukada, K. Itahashi, Hiroyuki Takeda, Go Mishima, Kenichi Yoshida, K Ichikawa, N. Sakamoto, Shuichi Ota, Kota Okochi, Yuni N. Watanabe, T. Nishi, Masao Nakamura, Satoru Hirenzaki, Hans Geissel, Naohito Inabe, K. Todoroki, D. Kameda, Helmut Weick, Ken Suzuki, Hiroyuki Miya, H. Yamakami, Kensuke Kusaka, Takashi Kubo, Hideko Nagahiro, Nobuhisa Fukunishi, and G. P. A. Berg
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Nuclear reaction ,Physics ,Isotope ,Spectrometer ,010308 nuclear & particles physics ,Binding energy ,General Physics and Astronomy ,01 natural sciences ,Deuterium ,0103 physical sciences ,Mass spectrum ,Atomic physics ,Nuclear Experiment ,010306 general physics ,Spectroscopy ,Beam (structure) - Abstract
We observed the atomic 1s and 2p states of π^{-} bound to ^{121}Sn nuclei as distinct peak structures in the missing mass spectra of the ^{122}Sn(d,^{3}He) nuclear reaction. A very intense deuteron beam and a spectrometer with a large angular acceptance let us achieve a potential of discovery, which includes the capability of determining the angle-dependent cross sections with high statistics. The 2p state in a Sn nucleus was observed for the first time. The binding energies and widths of the pionic states are determined and found to be consistent with previous experimental results of other Sn isotopes. The spectrum is measured at finite reaction angles for the first time. The formation cross sections at the reaction angles between 0° and 2° are determined. The observed reaction-angle dependence of each state is reproduced by theoretical calculations. However, the quantitative comparison with our high-precision data reveals a significant discrepancy between the measured and calculated formation cross sections of the pionic 1s state.
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- 2018
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20. Integrating Remote Sensing and Ground-Based Data for Enhanced Spatial–Temporal Analysis of Heatwaves: A Machine Learning Approach
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Thitimar Chongtaku, Attaphongse Taparugssanagorn, Hiroyuki Miyazaki, and Takuji W. Tsusaka
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heatwaves ,data gap-filling ,remote sensing ,satellite data ,air temperature ,machine learning ,Technology ,Engineering (General). Civil engineering (General) ,TA1-2040 ,Biology (General) ,QH301-705.5 ,Physics ,QC1-999 ,Chemistry ,QD1-999 - Abstract
In response to the urgent global threat posed by human-induced extreme climate hazards, heatwaves are still systematically under-reported and under-researched in Thailand. This region is confronting a significant rise in heat-related mortality, which has resulted in hundreds of deaths, underscoring a pressing issue that needs to be addressed. This research article is one of the first to present a solution for assessing heatwave dynamics, using machine learning (ML) algorithms and geospatial technologies in this country. It analyzes heatwave metrics like heatwave number (HWN), heatwave frequency (HWF), heatwave duration (HWD), heatwave magnitude (HWM), and heatwave amplitude (HWA), combining satellite-derived land surface temperature (LST) data with ground-based air temperature (Tair) observations from 1981 to 2019. The result reveals significant marked increases in both the frequency and intensity of daytime heatwaves in peri-urban areas, with the most pronounced changes being a 0.45-day/year in HWN, a 2.00-day/year in HWF, and a 0.27-day/year in HWD. This trend is notably less pronounced in urban areas. Conversely, rural regions are experiencing a significant escalation in nighttime heatwaves, with increases of 0.39 days/year in HWN, 1.44 days/year in HWF, and 0.14 days/year in HWD. Correlation analysis (p<0.05) reveals spatial heterogeneity in heatwave dynamics, with robust daytime correlations between Tair and LST in rural (HWN, HWF, HWD, r>0.90) and peri-urban (HWM, HWA, r>0.65) regions. This study emphasizes the importance of considering microclimatic variations in heatwave analysis, offering insights for targeted intervention strategies. It demonstrates how enhancing remote sensing with ML can facilitate the spatial–temporal analysis of heatwaves across diverse environments. This approach identifies critical risk areas in Thailand, guiding resilience efforts and serving as a model for managing similar microclimates, extending the applicability of this study. Overall, the study provides policymakers and stakeholders with potent tools for climate action and effective heatwave management. Furthermore, this research contributes to mitigating the impacts of extreme climate events, promoting resilience, and fostering environmental sustainability.
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- 2024
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21. Demonstration of transfer learning using 14 nm technology analog ReRAM array
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Fabia Farlin Athena, Omobayode Fagbohungbe, Nanbo Gong, Malte J. Rasch, Jimmy Penaloza, SoonCheon Seo, Arthur Gasasira, Paul Solomon, Valeria Bragaglia, Steven Consiglio, Hisashi Higuchi, Chanro Park, Kevin Brew, Paul Jamison, Christopher Catano, Iqbal Saraf, Claire Silvestre, Xuefeng Liu, Babar Khan, Nikhil Jain, Steven McDermott, Rick Johnson, I. Estrada-Raygoza, Juntao Li, Tayfun Gokmen, Ning Li, Ruturaj Pujari, Fabio Carta, Hiroyuki Miyazoe, Martin M. Frank, Antonio La Porta, Devi Koty, Qingyun Yang, Robert D. Clark, Kandabara Tapily, Cory Wajda, Aelan Mosden, Jeff Shearer, Andrew Metz, Sean Teehan, Nicole Saulnier, Bert Offrein, Takaaki Tsunomura, Gert Leusink, Vijay Narayanan, and Takashi Ando
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resistive random access memory ,HfOx ,deep learning ,analog hardware ,transfer learning ,open loop training ,Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 - Abstract
Analog memory presents a promising solution in the face of the growing demand for energy-efficient artificial intelligence (AI) at the edge. In this study, we demonstrate efficient deep neural network transfer learning utilizing hardware and algorithm co-optimization in an analog resistive random-access memory (ReRAM) array. For the first time, we illustrate that in open-loop deep neural network (DNN) transfer learning for image classification tasks, convergence rates can be accelerated by approximately 3.5 times through the utilization of co-optimized analog ReRAM hardware and the hardware-aware Tiki-Taka v2 (TTv2) algorithm. A simulation based on statistical 14 nm CMOS ReRAM array data provides insights into the performance of transfer learning on larger network workloads, exhibiting notable improvement over conventional training with random initialization. This study shows that analog DNN transfer learning using an optimized ReRAM array can achieve faster convergence with a smaller dataset compared to training from scratch, thus augmenting AI capability at the edge.
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- 2024
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22. Criticality supports cross-frequency cortical-thalamic information transfer during conscious states
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Daniel Toker, Eli Müller, Hiroyuki Miyamoto, Maurizio S Riga, Laia Lladó-Pelfort, Kazuhiro Yamakawa, Francesc Artigas, James M Shine, Andrew E Hudson, Nader Pouratian, and Martin M Monti
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consciousness ,criticality ,psychedelic ,anesthesia ,epilepsy ,thalamus ,Medicine ,Science ,Biology (General) ,QH301-705.5 - Abstract
Consciousness is thought to be regulated by bidirectional information transfer between the cortex and thalamus, but the nature of this bidirectional communication - and its possible disruption in unconsciousness - remains poorly understood. Here, we present two main findings elucidating mechanisms of corticothalamic information transfer during conscious states. First, we identify a highly preserved spectral channel of cortical-thalamic communication that is present during conscious states, but which is diminished during the loss of consciousness and enhanced during psychedelic states. Specifically, we show that in humans, mice, and rats, information sent from either the cortex or thalamus via δ/θ/α waves (∼1–13 Hz) is consistently encoded by the other brain region by high γ waves (52–104 Hz); moreover, unconsciousness induced by propofol anesthesia or generalized spike-and-wave seizures diminishes this cross-frequency communication, whereas the psychedelic 5-methoxy-N,N-dimethyltryptamine (5-MeO-DMT) enhances this low-to-high frequency interregional communication. Second, we leverage numerical simulations and neural electrophysiology recordings from the thalamus and cortex of human patients, rats, and mice to show that these changes in cross-frequency cortical-thalamic information transfer may be mediated by excursions of low-frequency thalamocortical electrodynamics toward/away from edge-of-chaos criticality, or the phase transition from stability to chaos. Overall, our findings link thalamic-cortical communication to consciousness, and further offer a novel, mathematically well-defined framework to explain the disruption to thalamic-cortical information transfer during unconscious states.
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- 2024
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23. Autoimmune Hemolytic Anemia Associated with Mature Ovarian Cystic Teratoma Containing Monoclonal Immunoglobulin G: A Case Report and Review of Literature
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Yuma Nato, Keiki Nagaharu, Keika Itoh, Naoki Shinke, Keiko Maeyama, Akihiko Sawaki, and Hiroyuki Miyashita
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Gynecology and obstetrics ,RG1-991 - Abstract
Background. Autoimmune hemolytic anemia (AIHA) associated with solid tumors such as mature cystic teratomas is rare and poorly understood. Here, we report a successfully treated case of secondary AIHA in a mature cystic teratoma containing antibodies against red blood cells. Case description. A 22-year-old woman was referred to our hospital with progressive anemia. Laboratory findings revealed hemolysis with a positive direct and indirect antiglobulin test. Imaging studies identified a left ovarian mass, suspected to be a mature cystic teratoma, which was later confirmed by histopathology after laparoscopic oophorocystectomy. The patient was treated with prednisolone, resulting in improved anemia. To examine the relationship between the tumor and AIHA, an indirect antiglobulin test was performed on the tumor contents. Stronger aggregations were observed at any concentration diluted by 10 times from 10 to 10,000 times of the tumor contents compared to the patient’s serum. Additionally, immunofixation electrophoresis of the tumor contents revealed the presence of monoclonal immunoglobulin G-κ. Conclusion. The presence of monoclonal IgG-κ in the tumor suggests intratumoral antibody production as a possible mechanism. Further research is necessary to elucidate the pathogenic relationship between such tumors and AIHA. The report also highlights the importance of considering secondary AIHA in patients with unexplained anemia and solid tumors.
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- 2024
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24. Sintered reaction-bonded silicon nitride ceramics for power-device substrates -review
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Yuki Nakashima, Hiroyuki Miyazaki, You Zhou, Kiyoshi Hirao, Tatsuki Ohji, and Manabu Fukushima
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Silicon nitride ,Thermal conductivity ,Mechanical properties ,Reaction bonding ,Oxygen ,Substrate ,Clay industries. Ceramics. Glass ,TP785-869 - Abstract
This review addressed the recent progress of sintered reaction‐bonded Si3N4 (SRBSN) ceramics which are expected to be used as ceramic substrates of the next-generation power devices. Following an overview of thermal conductivities of Si3N4 ceramics and their improvement strategies, we described the advantages of the SRBSN routes. Because of the low content of lattice oxygen, the SRBSN ceramics possess significantly high thermal conductivities, compared to Si3N4 ceramics prepared by conventional methods. This material also showed exceptionally high fracture toughness and the strong rising R-curve behavior. The properties of the SRBSN ceramics are largely affected by the nitridation conditions, including the temperature, pressure and heating rate, and the sintering additive ratios. The thermal fatigue tests revealed the excellent thermal fatigue resistance of the SRBSN substrates, compared with those of other ceramic substrates. The strength retention ratio after thermal fatigue was clearly proportional to the fracture toughness. The dielectric breakdown strength (DBS) of the SRBSN ceramics with large fibrous grains showed a thickness dependency reverse to the normal (lower DBS in thinner substrates).
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- 2023
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25. Exclusive quasi-free proton knockout from oxygen isotopes at intermediate energies
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Kazuyuki Ogata, Shinsuke Ota, T. Fukunaga, Juzo Zenihiro, C. S. Lee, S. S. Stepanyan, T. Suzuki, Masaki Sasano, Takashi Wakui, Masanori Dozono, Elizabeth Padilla-Rodal, N. Inabe, Hiroshi Tokieda, Motonobu Takaki, Yukie Maeda, Naoki Fukuda, A. Galindo-Uribarri, W. Kim, Kensuke Kusaka, Kazuki Yoshida, Atsushi Tamii, Tomotsugu Wakasa, Rin Yokoyama, Yoshiyuki Yanagisawa, Hiroyuki Takeda, Tetsuo Noro, Satoshi Sakaguchi, Y. Nozawa, T. L. Tang, Koichi Yoshida, Shin'ichiro Michimasa, Didier Beaumel, J. Yasuda, Alexandre Obertelli, Hiroaki Matsubara, Hiroshi Suzuki, Motoki Kobayashi, K. Kisamori, T. Kawahara, Kentaro Yako, Toshiyuki Kubo, Hiroyuki Miya, Takahiro Kawabata, Yuki Kubota, T. Fujii, Shoichiro Kawase, Tomohiro Uesaka, Hideyuki Sakai, Susumu Shimoura, Sanghoon Hwang, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
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Physics ,D13 Stable and unstable nuclei ,010308 nuclear & particles physics ,Nuclear Theory ,General Physics and Astronomy ,D27 Reactions induced by unstable nuclei ,Impulse (physics) ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,01 natural sciences ,7. Clean energy ,Isotopes of oxygen ,13. Climate action ,Ab initio quantum chemistry methods ,0103 physical sciences ,Neutron ,Atomic physics ,010306 general physics ,Nuclear Experiment - Abstract
International audience; The dependence of the single-particle strength on the difference between proton and neutron separation energies is studied for oxygen isotopes in a wide range of isospins. The cross sections of the quasi-free (p, 2p) reaction on 14,16,18,22,24O were measured at intermediate energies. The measured cross sections are compared to predictions based on the distorted wave impulse approximation and shell-model psd valence-space spectroscopic factors. The reduction factors, which are the ratio of the experimental cross sections to the theoretical predictions, show no apparent dependence on the proton–neutron separation energy difference. The result is compatible with the result of the (e, e p) reaction on stable targets and with the predictions of recent ab initio calculations.
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- 2018
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26. Development of low-pressure multi-wire drift chambers for high-resolution spectroscopy with radioactive isotope beams
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Shuichi Ota, Tomohiro Uesaka, Yuki Kubota, K. Miki, Shoichiro Kawase, Hiroaki Matsubara, Hiroyuki Miya, T. Fujii, Shin'ichiro Michimasa, A. Saito, Hideyuki Sakai, Susumu Shimoura, and C. S. Lee
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Nuclear and High Energy Physics ,Physics::Instrumentation and Detectors ,Scattering ,business.industry ,Chemistry ,Detector ,Tracking (particle physics) ,Nuclear physics ,Optics ,Physics::Accelerator Physics ,Atomic number ,Nuclear Experiment ,Nucleon ,Spectroscopy ,business ,Instrumentation ,Beam (structure) ,Voltage - Abstract
Low-pressure multi-wire drift chambers have been developed to track high-intensity radioactive isotope beams at the energies of around 200 MeV/nucleon. In order to minimize the effect of multiple scattering by radioactive isotope beam, the thickness of the detectors were minimized by using isobutane gas at low pressure (10 kPa). The performance of the position resolution, the tracking efficiency, and the beam intensity capability were evaluated as a function of atomic number and applied voltage. As a result, an overall position resolution of 300 μm was achieved for radioactive isotope beams with an intensity of 1 MHz. The details of the design specifications and performances of the low-pressure multi-wire drift chambers are described.
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- 2013
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27. Development of CVD diamond detector for time-of-flight measurements
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Tomohiro Uesaka, Hideyuki Sakai, Susumu Shimoura, Shuichi Ota, Remco Zegers, T. L. Tang, Andreas Stolz, S. Michimasa, Hiroaki Matsubara, Masanori Dozono, Hiroyuki Miya, Eiji Ideguchi, Shintaro Go, Motonobu Takaki, K. Kisamori, Hiroshi Tokieda, and H. Baba
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Nuclear and High Energy Physics ,Optical fiber ,Materials science ,business.industry ,Detector ,Analytical chemistry ,Chemical vapor deposition ,Signal ,Particle detector ,law.invention ,Time of flight ,Optics ,law ,business ,Instrumentation ,Radiation hardening ,Jitter - Abstract
The paper describes recent developments of diamond detector at CNS and discusses the timing signal transfer system suitable for optimizing its performance. The diamond detector is well known to have good properties as a radiation detector such as fast response and good radiation hardness. Consequently, it is an excellent candidate for serving as a high-resolution thin timing detector. CNS and NSCL/MSU started a collaboration to develop diamond detectors, and manufactured a detector with a size of 28 × 28 mm2 and thickness of 200 μm. An irradiation experiment of the detector was performed by using a 32-MeV α beam to check its basic performance. The CNS detector had almost 100% efficiency and a timing resolution of 27 ps ( σ ). Jitter in long optical-fiber signal-transfer lines was examined and found to be 10.7 ps ( σ ). Diamond detectors and signal transfer system using a optical fiber enable us to provide time-of-flight measurements with extremely high resolution.
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- 2013
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28. BigRIPS as a high resolution spectrometer for pionic atoms
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Hideaki Yamada, Naohito Inabe, Kota Okochi, Y. Murakami, Toshiyuki Kubo, Hans Geissel, K. Todoroki, Shumpei Noji, Daisuke Kameda, Yoshiki Tanaka, Hiroshi Suzuki, K. Miki, Kenichi Yoshida, Motonobu Takaki, M. Nakamura, Shin'ichiro Michimasa, G. P. A. Berg, Tatsuya Furuno, Hiroyuki Miya, Hiroyuki Fujioka, Shuichi Ota, Hiroyuki Takeda, Ryugo S. Hayano, Masanori Dozono, Hiroaki Matsubara, Kenta Itahashi, Noritsugu Nakatsuka, Kyo Tsukada, Helmut Weick, Naoki Fukuda, K. Suzuki, Takahiro Nishi, Shigeru Itoh, Tomohiro Uesaka, and Yuni N. Watanabe
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Physics ,Nuclear and High Energy Physics ,Spectrometer ,business.industry ,Resolution (electron density) ,Ion ,Full width at half maximum ,Optics ,Beamline ,Atom ,Spectral resolution ,business ,Spectroscopy ,Instrumentation - Abstract
We are presently working on a new project ‘pionic atom factory project’ at RIBF. The project aims at precision spectroscopy of the energy spectrum of the pionic atom for a wide range of elements, using missing-mass spectroscopy of the (d,3Hed,3He) reaction near the π-π- emission threshold. For this project, we developed a new ion optics for BigRIPS using the dispersion-matching method. In this optics the BigRIPS beam line is used as a high resolving-power forward angle spectrometer to momentum-analyze 3He. We are aiming for a spectral resolution of
- Published
- 2013
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29. SHARAQ spectrometer for high-resolution studies for RI-induced reactions
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Hiromi Sato, C. S. Lee, Yuki Kubota, K. Miki, S. Ota, Y. Yanagisawa, Toshiyuki Kubo, Shoichiro Kawase, Hiroshi Suzuki, T. Uesaka, Naoki Fukuda, T. Fujii, T. Baba, Naohito Inabe, Masanori Dozono, Hiroyuki Takeda, Susumu Shimoura, Shumpei Noji, Andreas Stolz, Y. Kikuchi, Takeo Kawabata, Shin'ichiro Michimasa, T. Ichihara, Hiroaki Matsubara, Remco Zegers, Hiroyuki Miya, H. Baba, Hideyuki Sakai, Yuji Shimizu, Kentaro Yako, Motoki Kobayashi, Hiroshi Tokieda, Daisuke Kameda, Rin Yokoyama, Yoshiko Sasamoto, Takahiro Nishi, K. Kisamori, Motonobu Takaki, M. Tsumura, and Shintaro Go
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Nuclear and High Energy Physics ,Spectrometer ,Physics::Instrumentation and Detectors ,Chemistry ,business.industry ,Resolution (electron density) ,Detector ,Tracking (particle physics) ,law.invention ,Nuclear physics ,Momentum ,Optics ,Beamline ,Achromatic lens ,law ,Physics::Accelerator Physics ,business ,Instrumentation ,Beam (structure) - Abstract
The SHARAQ spectrometer and High-Resolution Beamline, which began operation in March 2009, have been put into use for six experiments using charge exchange reactions with radioactive isotope beams. For experiments at SHARAQ, detector developments and ion optics studies continue to improve performance in high-resolution nuclear spectroscopy. We have introduced improved timing resolution with CVD diamond detectors, high count-rate beamline tracking detectors and development of multi-particle detection by cathode-readout drift chambers. Ion-optics studies for the high-resolution achromatic (HA) and dispersion-matching (DM) transport modes are also reported here. Momentum tagging in the HA mode demonstrated an improvement in spectroscopic resolution with respect to the momentum spread of the radioactive beam. For the DM transportation mode, a momentum resolution of 1 / 8100 (FWHM) was achieved by taking into account the positions and angles of the beam at the third focal plane of BigRIPS.
- Published
- 2013
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30. Spectroscopic Measurement in 9He and 12Be
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Kichiji Hatanaka, Susumu Shimoura, Y. Kikuch, T. Hashimoto, Takayoshi Suzuki, Nori Aoi, Satoshi Sakaguchi, Hiroyuki Miya, H. C. Lee, Shumpei Noji, Yusuke T. Maeda, Motonobu Takaki, Juzo Zenihiro, T. Fujii, Takeo Kawabata, Yuusuke Yasuda, Kentaro Yako, Tomohiro Uesaka, N. Yokota, Shuichi Ota, K. Kisamori, C. S. Lee, Yuki Kubota, Yoshiko Sasamoto, L. T. Tang, K. Miki, Masanori Dozono, Shoichiro Kawase, Hiroshi Matsubara, Keiji Takahisa, Hiroshi Tokieda, Rin Yokoyama, Shin'ichiro Michimasa, and Atsushi Tamii
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Physics ,Cross section (physics) ,Nuclear Theory ,Neutron ,Atomic physics ,Nuclear Experiment ,Spectroscopy ,Atomic and Molecular Physics, and Optics ,Energy (signal processing) ,Excitation ,Charge exchange - Abstract
Spectroscopy for neutron-rich nuclei 9He and 12Be has been performed by means of heavy-ion double charge exchange (HIDCX) (18O, 18Ne) reaction on stable target nuclei 9Be and 12C, respectively. Several clear peaks in 12Be at low excitation energy region even above neutron separation energy have been observed in one-shot measurement, whereas no prominent signals of 9He have been observed owing to the small cross section. It is shown that the HIDCX reaction is a new powerful spectroscopic tool for study of unstable neutron-rich nuclei.
- Published
- 2013
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31. First Precision Spectroscopy of Pionic Atoms at RI Beam Factory
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Helmut Weick, Satoshi Itoh, Shin'ichiro Michimasa, Masaki Nakamura, Daisuke Kameda, Kenta Itahashi, Hiroaki Matsubara, Toshiyuki Kubo, G. P. A. Berg, Hiroyuki Takeda, Shinsuke Ota, K. Miki, Ken Suzuki, Kyo Tsukada, Tomohiro Uesaka, Hans Geissel, K. Todoroki, Naohito Inabe, Koichi Yoshida, Natsumi Ikeno, Hiroyuki Fujioka, Hiroyuki Miya, Ryugo S. Hayano, Satoru Hirenzaki, Shumpei Noji, and Takahiro Nishi
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Physics ,Nuclear reaction ,Meson ,Nuclear Theory ,Atomic and Molecular Physics, and Optics ,Spectral line ,Nuclear physics ,Helium-3 ,Atom ,Physics::Accelerator Physics ,Physics::Atomic Physics ,Atomic physics ,Nuclear Experiment ,Nucleon ,Spectroscopy ,Isotopes of helium - Abstract
We conducted an inclusive missing-mass spectroscopy of 122Sn (d, 3He) reaction near the π¯ emission threshold at an incident energy of T d = 250 MeV/nucleon. The experiment sets its goals to the research and development of the high precision spectroscopy of pionic atoms at the RI beam factory (RIBF) of RIKEN, which precedes a new project, pionic atom factory project (piAF), to observe pionic atoms systematically. Here, we report the preliminary results of the pilot experiment.
- Published
- 2013
32. Candidate Resonant Tetraneutron State Populated by theHe4(He8,Be8)Reaction
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C. S. Lee, Shintaro Go, H. Baba, N. Fukuda, Daisuke Kameda, F. Hammache, Motonobu Takaki, Yukie Maeda, M. Itoh, Shumpei Noji, Rin Yokoyama, Yuya Kubota, Kentaro Yako, H. Sato, Yosuke Kondo, M. Assie, D. Beaumel, Michikazu Kobayashi, Yohei Shimizu, H. Sakai, Hiroyuki Takeda, Takeo Kawabata, K. Miki, Yoshiko Sasamoto, Toshiyuki Kubo, Shoichiro Kawase, Masaki Sasano, Teruo Fujii, Susumu Shimoura, T. Nishi, Shin'ichiro Michimasa, Tomohiro Uesaka, Hiroshi Tokieda, L. Tang, Satoshi Takeuchi, Atsushi Tamii, Satoshi Sakaguchi, Eiji Ideguchi, Y. Yanagisawa, T. Baba, M. Tsumura, Hiroyuki Miya, K. Kisamori, Hiroaki Matsubara, Andreas Stolz, K. Yoshida, Shuichi Ota, Masanori Dozono, Naohito Inabe, H. Suzuki, and M. Kurata-Nishimura
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Physics ,010308 nuclear & particles physics ,Q value ,Spectrum (functional analysis) ,General Physics and Astronomy ,State (functional analysis) ,01 natural sciences ,7. Clean energy ,Nuclear physics ,0103 physical sciences ,Tetraneutron ,High Energy Physics::Experiment ,Nuclear Experiment ,010306 general physics ,Energy (signal processing) - Abstract
A candidate resonant tetraneutron state is found in the missing-mass spectrum obtained in the double-charge-exchange reaction ^{4}He(^{8}He,^{8}Be) at 186 MeV/u. The energy of the state is 0.83±0.65(stat)±1.25(syst) MeV above the threshold of four-neutron decay with a significance level of 4.9σ. Utilizing the large positive Q value of the (^{8}He,^{8}Be) reaction, an almost recoilless condition of the four-neutron system was achieved so as to obtain a weakly interacting four-neutron system efficiently.
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- 2016
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33. Measurement of Pionic121Sn atoms at the RI beam factory
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Toshiyuki Kubo, Shumpei Noji, Satoru Hirenzaki, Satoshi Itoh, Tomohiro Uesaka, Natsumi Ikeno, Masaki Nakamura, Takahiro Nishi, Kenta Itahashi, Helmut Weick, K. Miki, Ken Suzuki, Hiroyuki Takeda, Hiroyuki Miya, Daisuke Kameda, Koichi Yoshida, Hans Geissel, K. Todoroki, Kyo Tsukada, Naohito Inabe, Ryugo S. Hayano, Hiroaki Matsubara, Shinsuke Ota, Shin'ichiro Michimasa, Hiroyuki Fujioka, and G. P. A. Berg
- Subjects
Physics ,Nuclear reaction ,Nuclear and High Energy Physics ,Condensed Matter Physics ,Atomic and Molecular Physics, and Optics ,Spectral line ,Nuclear physics ,Helium-3 ,Isotopes of tin ,Atom ,Physical and Theoretical Chemistry ,Atomic physics ,Spectroscopy ,Isotopes of helium ,Beam (structure) - Abstract
We have measured the energy spectrum of pionic 121Sn atoms by missing-mass spectroscopy of the 122Sn(d, 3He) reaction near the π − emission threshold. The measurement serves as a pilot experiment for high precision systematic spectroscopy of deeply bound pionic atoms in a new pionic Atom Factory project (piAF) at the RI beam factory (RIBF) of RIKEN. The status of the analysis is reported.
- Published
- 2012
34. Spectroscopy of Single-Particle States in Oxygen Isotopes via \((\vec{p},2p)\) Reaction
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Hiroyuki Miya, Tomotsugu Wakasa, Shinsuke Ota, Hiroshi Suzuki, T. L. Tang, T. Fukunaga, A. Galindo-Uribarri, Hiroyuki Takeda, Juzo Zenihiro, Elizabeth Padilla-Rodal, Takashi Wakui, Toshiyuki Kubo, Keiichi Kisamori, Daisuke Kameda, Hiroshi Tokieda, Y. Yanagisawa, Naohito Inabe, Hiroaki Matsubara, Hideyuki Sakai, Motonobu Takaki, Kensuke Kusaka, Koichi Yoshida, Masanori Dozono, Naoki Fukuda, W. Kim, Shin'ichiro Michimasa, Yukie Maeda, Susumu Shimoura, Tomohiro Uesaka, Tetsuo Noro, Alexandre Obertelli, Satoshi Sakaguchi, Sanghoon Hwang, Motoki Kobayashi, S. S. Stepanyan, J. Yasuda, Rin Yokoyama, Didier Beaumel, Kentaro Yako, C. S. Lee, T. Kawahara, Masaki Sasano, T. Fujii, Shoichiro Kawase, and Yuki Kubota
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Physics ,Nuclear reaction ,Isotope ,Hadron ,Analytical chemistry ,Particle ,Elementary particle ,Fermion ,Spectroscopy ,Isotopes of oxygen - Published
- 2015
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35. Superdeformation in 35S
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T. Suzuki, Yuichi Hatsukawa, K. Kisamori, Yutaka Watanabe, Megumi Niikura, Hideo Harada, J. Takatsu, Hiroyuki Miya, Motoki Kobayashi, Kazuyoshi Furutaka, Atsushi Kimura, Takeshi Yamamoto, Shoji Nakamura, Shin'ichiro Michimasa, Masumi Oshima, Daisuke Suzuki, Eiji Ideguchi, Hiroki Nishibata, Ayumi Yagi, Yosuke Toh, Kotaro Shirotori, Takeshi Koike, Yoshikazu Hirayama, Susumu Shimoura, Shinsuke Ota, Fumito Kitatani, Mitsuo Koizumi, F. Azaiez, Motonobu Takaki, Rin Yokoyama, Shintaro Go, M. Sugawara, Yosuke Ito, Toshiyuki Shizuma, D. Verney, and I. Matea
- Subjects
Superdeformation ,Physics ,Light nucleus ,Atomic orbital ,Excited state ,SHELL model ,Atomic physics - Abstract
A rotational band from \(7/2^{ - }\) to \(19/2^{ - }\) was observed in ^35S. The half-life of the transition from the \(19/2^{ - }\) state to \(15/2^{ - }\) state was determined by using the residual Doppler shift of the \(\gamma \)-ray peak. The deduced half-life and the relative intensities of in-band transitions indicate the presence of superdeformed structure in ^35S. The shell model calculation showed that multi-particle multi-hole configurations including \(f_{7/2}\) orbitals are essential for superdeformation in ^35S.
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- 2015
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36. Missing-Mass Spectroscopy of the 4-Neutron System by Exothermic Double-Charge Exchange Reaction 4He(8He,8Be)4n
- Author
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Leung Tang, Hiroshi Suzuki, Fariouz Hammache, Yosuke Kondo, Takahiro Kawabata, Shumpei Noji, M. Kurata-Nishimura, Naohiro Inabe, Shin'ichiro Michimasa, Keiichi Kisamori, Yukie Maeda, Y. Yanagisawa, Hiromi Sato, C. S. Lee, Satoshi Takeuchi, Shoichiro Kawase, Yohei Shimizu, Satoshi Sakaguchi, K. Miki, Hiroaki Matsubara, Rin Yokoyama, Yoshiko Sasamoto, Toshiyuki Kubo, Yuki Kubota, Daisuke Kameda, Motoki Kobayashi, Naoki Fukuda, Kentaro Yako, T. Fujii, T. Baba, Masaki Sasano, Hiroshi Tokieda, Masanori Dozono, Andreas Stolz, Hiroyuki Takeda, Eiji Ideguchi, Shinsuke Ota, Hideyuki Sakai, Hiroyuki Miya, Masatoshi Itoh, Atsushi Tamii, M. Tsumura, Didier Beaumel, Shintaro Go, Marlene Assie, Susumu Shimoura, Tomohiro Uesaka, Motonobu Takaki, Hidetada Baba, and Takahiro Nishi
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Exothermic reaction ,Nuclear reaction ,Materials science ,Analytical chemistry ,Neutron ,Alpha particle ,Mass spectrometry ,Nucleon ,Resonance (chemistry) ,Charged particle - Published
- 2015
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37. A Segmented Neutron Detector with a High Position Resolution for the \((p,pn)\) Reactions
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Tomotsugu Wakasa, T. L. Tang, Hiroaki Matsubara, K. Miki, Kimiko Sekiguchi, Atsushi Tamii, Hiroshi Tokieda, Masatoshi Itoh, Hiroyuki Miya, T. Taguchi, Tatsushi Shima, J. Yasuda, Takashi Wakui, Juzo Zenihiro, Tomohiro Uesaka, Yuki Kubota, Shinsuke Ota, Motoki Kobayashi, Masaki Sasano, Masanori Dozono, Shoichiro Kawase, and C. S. Lee
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Physics ,Nuclear reaction ,Photomultiplier ,Optics ,business.industry ,Resolution (electron density) ,Measuring instrument ,Neutron detection ,Neutron ,business ,Image resolution ,Particle detector - Published
- 2015
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38. Spin-Isospin Response of the Neutron-Rich Nucleus 8He via the \((p,n)\) Reaction in Inverse Kinematics
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Toshiyuki Kubo, Hiroshi Suzuki, Hiroyuki Takeda, Keiichi Kisamori, Kentaro Yako, Naohito Inabe, Motoki Kobayashi, Y. Yanagisawa, Hideyuki Sakai, Shoichiro Kawase, Masaki Sasano, Hiroyuki Miya, Shinsuke Ota, Daisuke Kameda, Naoki Fukuda, Shin'ichiro Michimasa, C. S. Lee, Masanori Dozono, Motonobu Takaki, Yuki Kubota, and Susumu Shimoura
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Nuclear physics ,Physics ,medicine.anatomical_structure ,Inverse kinematics ,Isospin ,medicine ,Neutron ,Nucleus ,Spin-½ - Published
- 2015
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39. Proton Single-Particle Energy of 23F by Quasi-Free (\(\vec{\text{p}},2\text{p}\)) Scattering and Operation of Polarized Proton Target
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Rin Yokoyama, Shin'ichiro Michimasa, T. Fukunaga, C. S. Lee, W. Kim, Motoki Kobayashi, Elizabeth Padilla-Rodal, Hiroyuki Takeda, Yukie Maeda, Tomotsugu Wakasa, Takashi Wakui, Shoichiro Kawase, Masaki Sasano, Juzo Zenihiro, T. L. Tang, Daisuke Kameda, Hiroshi Suzuki, Hiroaki Matsubara, Masanori Dozono, Yuki Kubota, Shinsuke Ota, Kentaro Yako, T. Fujii, J. Yasuda, T. Kawahara, Motonobu Takaki, Hiroyuki Miya, Hiroshi Tokieda, Kensuke Kusaka, Tetsuo Noro, Satoshi Sakaguchi, Naoki Fukuda, A. Galindo-Uribarri, Alexandre Obertelli, S. S. Stepanyan, Susumu Shimoura, Tomohiro Uesaka, Sanghoon Hwang, Didier Beaumel, and Keiichi Kisamori
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Physics ,Nuclear reaction ,Proton ,Scattering ,Excited state ,Hadron ,Elementary particle ,Fermion ,Atomic physics ,Nucleon - Published
- 2015
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40. CUX2 deficiency causes facilitation of excitatory synaptic transmission onto hippocampus and increased seizure susceptibility to kainate
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Toshimitsu Suzuki, Tetsuya Tatsukawa, Genki Sudo, Caroline Delandre, Yun Jin Pai, Hiroyuki Miyamoto, Matthieu Raveau, Atsushi Shimohata, Iori Ohmori, Shin-ichiro Hamano, Kazuhiro Haginoya, Mitsugu Uematsu, Yukitoshi Takahashi, Masafumi Morimoto, Shinji Fujimoto, Hitoshi Osaka, Hirokazu Oguni, Makiko Osawa, Atsushi Ishii, Shinichi Hirose, Sunao Kaneko, Yushi Inoue, Adrian Walton Moore, and Kazuhiro Yamakawa
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Medicine ,Science - Abstract
Abstract CUX2 gene encodes a transcription factor that controls neuronal proliferation, dendrite branching and synapse formation, locating at the epilepsy-associated chromosomal region 12q24 that we previously identified by a genome-wide association study (GWAS) in Japanese population. A CUX2 recurrent de novo variant p.E590K has been described in patients with rare epileptic encephalopathies and the gene is a candidate for the locus, however the mutation may not be enough to generate the genome-wide significance in the GWAS and whether CUX2 variants appear in other types of epilepsies and physiopathological mechanisms are remained to be investigated. Here in this study, we conducted targeted sequencings of CUX2, a paralog CUX1 and its short isoform CASP harboring a unique C-terminus on 271 Japanese patients with a variety of epilepsies, and found that multiple CUX2 missense variants, other than the p.E590K, and some CASP variants including a deletion, predominantly appeared in patients with temporal lobe epilepsy (TLE). The CUX2 variants showed abnormal localization in human cell culture analysis. While wild-type CUX2 enhances dendritic arborization in fly neurons, the effect was compromised by some of the variants. Cux2- and Casp-specific knockout mice both showed high susceptibility to kainate, increased excitatory cell number in the entorhinal cortex, and significant enhancement in glutamatergic synaptic transmission to the hippocampus. CASP and CUX2 proteins physiologically bound to each other and co-expressed in excitatory neurons in brain regions including the entorhinal cortex. These results suggest that CUX2 and CASP variants contribute to the TLE pathology through a facilitation of excitatory synaptic transmission from entorhinal cortex to hippocampus.
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- 2022
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41. Nanomaterials by severe plastic deformation: review of historical developments and recent advances
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Kaveh Edalati, Andrea Bachmaier, Victor A. Beloshenko, Yan Beygelzimer, Vladimir D. Blank, Walter J. Botta, Krzysztof Bryła, Jakub Čížek, Sergiy Divinski, Nariman A. Enikeev, Yuri Estrin, Ghader Faraji, Roberto B. Figueiredo, Masayoshi Fuji, Tadahiko Furuta, Thierry Grosdidier, Jenő Gubicza, Anton Hohenwarter, Zenji Horita, Jacques Huot, Yoshifumi Ikoma, Miloš Janeček, Megumi Kawasaki, Petr Král, Shigeru Kuramoto, Terence G. Langdon, Daniel R. Leiva, Valery I. Levitas, Andrey Mazilkin, Masaki Mito, Hiroyuki Miyamoto, Terukazu Nishizaki, Reinhard Pippan, Vladimir V. Popov, Elena N. Popova, Gencaga Purcek, Oliver Renk, Ádám Révész, Xavier Sauvage, Vaclav Sklenicka, Werner Skrotzki, Boris B. Straumal, Satyam Suwas, Laszlo S. Toth, Nobuhiro Tsuji, Ruslan Z. Valiev, Gerhard Wilde, Michael J. Zehetbauer, and Xinkun Zhu
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severe plastic deformation (spd) ,surface severe plastic deformation ,ultrafine-grained (ufg) materials ,mechanical properties ,functional properties ,Materials of engineering and construction. Mechanics of materials ,TA401-492 - Abstract
Severe plastic deformation (SPD) is effective in producing bulk ultrafine-grained and nanostructured materials with large densities of lattice defects. This field, also known as NanoSPD, experienced a significant progress within the past two decades. Beside classic SPD methods such as high-pressure torsion, equal-channel angular pressing, accumulative roll-bonding, twist extrusion, and multi-directional forging, various continuous techniques were introduced to produce upscaled samples. Moreover, numerous alloys, glasses, semiconductors, ceramics, polymers, and their composites were processed. The SPD methods were used to synthesize new materials or to stabilize metastable phases with advanced mechanical and functional properties. High strength combined with high ductility, low/room-temperature superplasticity, creep resistance, hydrogen storage, photocatalytic hydrogen production, photocatalytic CO2 conversion, superconductivity, thermoelectric performance, radiation resistance, corrosion resistance, and biocompatibility are some highlighted properties of SPD-processed materials. This article reviews recent advances in the NanoSPD field and provides a brief history regarding its progress from the ancient times to modernity. Abbreviations: ARB: Accumulative Roll-Bonding; BCC: Body-Centered Cubic; DAC: Diamond Anvil Cell; EBSD: Electron Backscatter Diffraction; ECAP: Equal-Channel Angular Pressing (Extrusion); FCC: Face-Centered Cubic; FEM: Finite Element Method; FSP: Friction Stir Processing; HCP: Hexagonal Close-Packed; HPT: High-Pressure Torsion; HPTT: High-Pressure Tube Twisting; MDF: Multi-Directional (-Axial) Forging; NanoSPD: Nanomaterials by Severe Plastic Deformation; SDAC: Shear (Rotational) Diamond Anvil Cell; SEM: Scanning Electron Microscopy; SMAT: Surface Mechanical Attrition Treatment; SPD: Severe Plastic Deformation; TE: Twist Extrusion; TEM: Transmission Electron Microscopy; UFG: Ultrafine Grained
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- 2022
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42. De novo inter-regional coactivations of preconfigured local ensembles support memory
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Hiroyuki Miyawaki and Kenji Mizuseki
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Science - Abstract
The authors show that fear-memory-related cell-ensembles in the amygdala, hippocampus, and prefrontal cortex are inter-regionally co-activated in post-learning sleep. The co-activations are hosted by fast network oscillations and re-appear during recall.
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- 2022
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43. Thioredoxin interacting protein protects mice from fasting induced liver steatosis by activating ER stress and its downstream signaling pathways
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Hiroyuki Miyahara, Kosei Hasegawa, Masato Yashiro, Toshiaki Ohara, Masayoshi Fujisawa, Teizo Yoshimura, Akihiro Matsukawa, and Hirokazu Tsukahara
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Medicine ,Science - Abstract
Abstract Under normal conditions, fasting results in decreased protein disulfide isomerase (PDI) activity and accumulation of unfolded proteins, leading to the subsequent activation of the unfolded protein response (UPR)/autophagy signaling pathway to eliminate damaged mitochondria. Fasting also induces upregulation of thioredoxin-interacting protein (TXNIP) expression and mice deficient of this protein (TXNIP-KO mice) was shown to develop severe hypoglycemia, hyperlipidemia and liver steatosis (LS). In the present study, we aimed to determine the role of TXNIP in fasting-induced LS by using male TXNIP-KO mice that developed LS without severe hypoglycemia. In TXNIP-KO mice, fasting induced severe microvesicular LS. Examinations by transmission electron microscopy revealed mitochondria with smaller size and deformities and the presence of few autophagosomes. The expression of β-oxidation-associated genes remained at the same level and the level of LC3-II was low. PDI activity level stayed at the original level and the levels of p-IRE1 and X-box binding protein 1 spliced form (sXBP1) were lower. Interestingly, treatment of TXNIP-KO mice with bacitracin, a PDI inhibitor, restored the level of LC3-II after fasting. These results suggest that TXNIP regulates PDI activity and subsequent activation of the UPR/autophagy pathway and plays a protective role in fasting-induced LS.
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- 2022
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44. Effectuation and Business Models
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Hiroyuki Miyai
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effectuation ,business model ,value creation ,marketing strategy ,Marketing. Distribution of products ,HF5410-5417.5 - Abstract
The purpose of this study is to systematically relate research on effectuation with that on business models, and to propose a starting point for the derivation of marketing implications. The results show that possible connection of studies in these two areas can be examined by focusing on the hierarchy of corporate business processes and systems. Using interviews with three entrepreneurs obtained from practice-based research, this paper examines effectuation decision making of individual entrepreneurs in relation to frameworks used in business model research and development practice, such as value proposition, pivot, and product market fit. We discuss effectuation decision making by individual entrepreneurs in a company, and we show that effectuation decision making by such individuals can be connected to group decision making by utilizing the framework of business model research.
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- 2022
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45. The Deeply Bound Pionic States in 121Sn Produced by (d,3He) Reaction
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Hiroyuki Yamada, Satoshi Itoh, Georg P. A. Berg, Ryugo S. Hayano, Masaki Nakamura, N. Inabe, Y.K. Tanaka, K. Miki, Kota Okochi, Tatsuya Furuno, Yuni N. Watanabe, Hiroyuki Miya, Shumpei Noji, Shin'ichiro Michimasa, Toshiyuki Kubo, Ken Suzuki, Hiroyuki Fujioka, Naoki Fukuda, Motonobu Takaki, Helmut Weick, Hiroshi Suzuki, Shinsuke Ota, Y. Murakami, Hans Geissel, K. Todoroki, Koichi Yoshida, Hiroaki Matsubara, Tomohiro Uesaka, Takahiro Nishi, Kenta Itahashi, Hiroyuki Takeda, Daisuke Kameda, Masanori Dozono, Noritsugu Nakatsuka, and Kyo Tsukada
- Subjects
Physics - Published
- 2014
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46. A new neutron detector with a high position resolution for the study of the (p, pn) reaction on rare isotopes
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Shuichi Ota, Takashi Wakui, Hiroaki Matsubara, Tomohiro Uesaka, C. S. Lee, Masanori Dozono, Hiroyuki Miya, T. L. Tang, Kimiko Sekiguchi, M. Itoh, Yuya Kubota, Motoki Kobayashi, T. Taguchi, Shoichiro Kawase, Masaki Sasano, and Hiroshi Tokieda
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Physics ,Nuclear reaction ,Photomultiplier ,Proton ,Physics::Instrumentation and Detectors ,QC1-999 ,Detector ,Nuclear Theory ,Particle detector ,Nuclear physics ,Scintillation counter ,Neutron detection ,Neutron ,Nuclear Experiment - Abstract
We are developing a neutron detector with a position resolution better than 3 mm to study the single particle properties of nuclei by the knockout ( p , pn ) reaction at intermediate energies. We constructed a prototype detector consisting of scintillating fibers and multi-anode photomultiplier tubes (PMTs). A test experiment using 70-MeV proton and 68- and 50-MeV neutron was performed for characterizing its performance. In preliminary results, a position resolution of about 3 mm, is realized, as designed. The resulting separation-energy resolution would be 1 MeV, when using this system at a distance of 2 m from the target for measuring the ( p , pn ) reaction.
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- 2014
47. Development of a simple method for determination of gas permeability resistance of whole chemical protective gloves
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Takamasa Aoki, Satoko Iwasawa, Shinobu Yamamoto, Akito Takeuchi, Shigeru Tanaka, and Hiroyuki Miyauchi
- Subjects
chemical protective glove ,layered film ,passive sampler ,permeation time ,toluene ,Industrial safety. Industrial accident prevention ,T55-55.3 ,Medicine (General) ,R5-920 - Abstract
Objectives: We investigated the protection performance of whole gloves by developing a straightforward permeability resistance method and evaluating the permeation over 480 min. Methods: The permeation time for toluene was obtained for seven glove types according to the Japanese Industrial Standards. In addition, the permeability resistance of whole gloves was evaluated from the ratio of collected amount of toluene in the passive layered sampler attached to the inside and outside of the glove. Results: The permeation times of the two types of polyurethane gloves evaluated were less than 1 min each. However, the percentages of toluene that permeated through the whole gloves determined by the developed method were 32.5% and 6.8% for the thin and thick gloves, respectively, at 480 min and 71.8% and 24.1% for the thin and thick gloves, respectively, at 1,440 min. Permeation times for all three types of layered films were more than 1,440 min, but the whole glove tests showed differences of 1.7%, 3.1%, and less than 0.1% at 1,440 min. The causes of these differences were assumed to be related to variations in thickness, type of material, and differences in deposition state of the various gloves. Conclusions: It became possible to grasp the permeation performance throughout whole chemical resistant gloves, which could not be known only with material testing, using a straightforward permeability test method.
- Published
- 2021
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48. Author Correction: Neuronal firing rates diverge during REM and homogenize during non-REM
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Hiroyuki Miyawaki, Brendon O. Watson, and Kamran Diba
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Medicine ,Science - Published
- 2021
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49. Evaluation of the Jichi Medical University diverticular hemorrhage score in the clinical management of acute diverticular bleeding with emergency or elective endoscopy: A pilot study
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Takeshi Uehara, Satohiro Matsumoto, Hiroyuki Tamura, Masahiro Kashiura, Takashi Moriya, Kenichi Yamanaka, Hakuei Shinhata, Masanari Sekine, Hiroyuki Miyatani, and Hirosato Mashima
- Subjects
Medicine ,Science - Abstract
Background and aims Emergency endoscopic hemostasis for colonic diverticular bleeding is effective in preventing serious consequences. However, the low identification rate of the bleeding source makes the procedure burdensome for both patients and providers. We aimed to establish an efficient and safe emergency endoscopy system. Methods We prospectively evaluated the usefulness of a scoring system (Jichi Medical University diverticular hemorrhage score: JD score) based on our experiences with past cases. The JD score was determined using four criteria: CT evidence of contrast agent extravasation, 3 points; oral anticoagulant (any type) use, 2 points; C-reactive protein ≥1 mg/dL, 1 point; and comorbidity index ≥3, 1 point. Based on the JD score, patients with acute diverticular bleeding who underwent emergency or elective endoscopy were grouped into JD ≥3 or JD Results The JD ≥3 and JD Conclusion We established a safe and efficient endoscopic scoring system for treating colonic diverticular bleeding. The higher the JD score, the higher the bleeding source identification, leading to a successful hemostatic procedure. Elective endoscopy was possible in the JD
- Published
- 2023
50. Status and future plan of the spectroscopy of pionic atoms
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Shumpei Noji, K. Miki, Noritsugu Nakatsuka, Yuni N. Watanabe, Kyo Tsukada, H. Yamakami, Tatsuya Furuno, Kenichi Yoshida, T. Nishi, Hideaki Yamada, M. Nakamura, Naohito Inabe, Hiroyuki Miya, G. P. A. Berg, Naoki Fukuda, Shigeru Itoh, Ryugo S. Hayano, Kenta Itahashi, K Suzuki, Tomohiro Uesaka, Shin'ichiro Michimasa, Toshiyuki Kubo, Y. Murakami, Shuichi Ota, D. Kameda, Hiroyuki Fujioka, Motonobu Takaki, Masanori Dozono, Yasumoto Tanaka, H Suzuki, Hiroyuki Takeda, Kota Okochi, Hiroaki Matsubara, Helmut Weick, Hans Geissel, and K. Todoroki
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Physics ,History ,Silicon ,Isotope ,Resolution (electron density) ,Nuclear Theory ,chemistry.chemical_element ,Computer Science Applications ,Education ,Nuclear physics ,Full width at half maximum ,chemistry ,Deuterium ,Yield (chemistry) ,ddc:530 ,Physics::Atomic Physics ,Atomic physics ,Chiral symmetry breaking ,Spectroscopy ,Nuclear Experiment - Abstract
2nd FAIR NExt generation ScientistS, Berlin, Germany, 16 Sep 2013 - 21 Sep 2013; Journal of physics / Conference Series Conference Series 503, 012037 (2014). doi:10.1088/1742-6596/503/1/012037, The spectroscopy of deeply bound pionic atoms provides a way to understand the restoration of chiral symmetry breaking at finite density. We have been performing a series of experiments of missing-mass spectroscopy of the (d,3He) reaction at RIBF to investigate pionic atoms of several Sn isotopes. As a first step, we conducted a pilot experiment to measure deeply bound pionic states of 121Sn and successfully observed the deeply bound pionic states. In addition to the experiment at RIBF, we are planning the spectroscopy of deeply bound pionic atoms in inverse kinematics and conducted a feasible study by simulations. We showed that by using a deuterium gaseous active target TPC and silicon detectors, the Q-value resolution is about 500 keV (FWHM) and the yield of the pionic 1s state is 20 counts/day, indicating the experiment is feasible., Published by IOP Publ., Bristol
- Published
- 2014
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