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Controlled synthesis of magnetic carbon nanoparticles via glycerol/ferrocene co-pyrolysis with magnetic induction

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Particuology 2018年第2期16卷 9-16页

作者： Konrat Kerdnawee Noriaki Sano hajime Tamon Tawatchai Charinpanitkul Center of Excellence in Particle Technology Department of Chemical Engineering Faculty of Engineering Chulalongkorn University Bangkok Thailand Department of Chemical Engineering Graduate School of Engineering Kyoto University Kyoto Japan

We performed a controlled synthesis of magnetic carbon nanoparticles （M-CNPs） via co-pyrolysis of glycerol and ferrocene with magnetic induction. The morphology of the synthesized M-CNPs was confirmed by transmission electron microscopy, and thermogravimetric analysis was used to analyze the carbon and Fe contents. M-CNPs that responded to magnetic stimulation were also examined with an AC-magnetic susceptibility analyzer. Our investigations on the influence of synthesis temperature in the range 700-1000℃ suggested that for an initial glycerol to ferrocene weight ratio of 3：1 and a temperature of 800 ℃ gave the highest yield of M-CNPs. Comparing the synthesis with and without magnetic induction, the controlled synthesis under the influence of magnetic induction shows promise as a method for producing high quality M-CNPs in high yields.

关键词： Carbon nanoparticle Glycerol Co-pyrolysis Magnetic induction

Soft ground tunnel lithology classification using clustering-guided light gradient boosting machine

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第11期15卷 2857-2867页

作者： Kursat Kilic hajime Ikeda Tsuyoshi Adachi Youhei Kawamura Department of Geosciences Geotechnology and Materials Engineering for ResourcesGraduate School of International Resource SciencesAkita UniversityAkita010-8502Japan Division of Sustainable Resources Engineering Faculty of EngineeringHokkaido UniversityKita 13Nishi 8Kita-kuSapporo060-8628Japan

During tunnel boring machine(TBM)excavation,lithology identification is an important issue to understand tunnelling performance and avoid time-consuming ***,site investigation generally lacks ground samples and the information is subjective,heterogeneous,and imbalanced due to mixed ground *** this study,an unsupervised(K-means)and synthetic minority oversampling technique(SMOTE)-guided light-gradient boosting machine(LightGBM)classifier is proposed to identify the soft ground tunnel classification and determine the imbalanced issue of tunnelling *** the tunnel excavation,an earth pressure balance(EPB)TBM recorded 18 different operational parameters along with the three main tunnel *** proposed model is applied using Python low-code PyCaret ***,four decision tree-based classifiers were obtained in a short time period with automatic hyperparameter tuning to determine the best model for clustering-guided SMOTE *** addition,the Shapley additive explanation(SHAP)was implemented to avoid the model black box *** proposed model was evaluated using different metrics such as accuracy,F1 score,precision,recall,and receiver operating characteristics(ROC)curve to obtain a reasonable outcome for the minority *** shows that the proposed model can provide significant tunnel lithology identification based on the operational parameters of *** proposed method can be applied to heterogeneous tunnel formations with several TBM operational parameters to describe the tunnel lithologies for efficient tunnelling.

关键词： Earth pressure balance(EPB) Tunnel boring machine(TBM) Soft ground tunnelling Tunnel lithology Operational parameters Synthetic minority oversampling technique (SMOTE) K-means clustering

Camera array calibration for light field acquisition

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Frontiers of Computer Science 2015年第5期9卷 691-702页

作者： Yichao XU Kazuki MAENO hajime NAGAHARA Rin-ichiro TANIGUCHI Graduate School of Information Science and Electrical Engineering Kyushu University Fukuoka 819-0395 Japan

Light field cameras are becoming popular in com- puter vision and graphics, with many research and commercial applications already having been proposed. Various types of cameras have been developed with the camera array being one of the ways of acquiring a 4D light field image using multiple cameras. Camera calibration is essential, since each application requires the correct projection and ray geometry of the fight field. The calibrated parameters are used in the fight field image rectified from the images captured by multiple cameras. Various camera calibration approaches have been proposed for a single camera, multiple cameras, and a moving camera. However, although these approaches can be applied to calibrating camera arrays, they are not effective in terms of accuracy and computational cost. Moreover, less attention has been paid to camera calibration of a light field camera. In this paper, we propose a calibration method for a camera array and a rectification method for generating a light field image from the captured images. We propose a two-step algorithm consisting of closed form initialization and nonlinear refinement, which extends Zhang＇s well-known method to the camera array. More importantly, we introduce a rigid camera constraint whereby the array of cameras is rigidly aligned in the camera array and utilize this constraint in our calibration. Using this constraint, we obtained much faster and more accurate calibration results in the experiments.

关键词： light field camera array calibration rectification digital refocusing

Analyses and architectural typology of preserved traditional mosques in the old city of Herat in Afghanistan:the case of Quzzat Quarter

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Built Heritage 2022年第4期6卷 51-64页

作者： Ghulam Mohammad Asim Shimizu hajime Faculty of Engineering and Science University of the Ryukyus1 Aza-SenbaruNishihara-choNakagami-gunOkinawa 903-0213Japan

The study aims to analyse the architectural typology and determine the period of construction for the preserved traditional mosques of the Quzzat Quarter in the Old City of Herat(known as the Pearl of Khorasan).Twenty-nine mosques are located in the area,three of which are modern and 26 are *** out of the 26 traditional mosques still exist and have preserved their traditional *** analogy to analyse water cisterns and mosques,we determine when each mosque was developed and establish the period of development for each *** analyses are carried out on the edifces’architectural *** analyses and mosque typologies suggest that fve buildings were built before the Timurid dynasty;two were built during the Timurid dynasty(1370−1507 CE);and one was built after the Timurid *** mosques incorporating elements from diferent periods are counted as exceptions,and the remaining two are considered to have been built during transitional periods.

关键词： Architectural analyses Analogy Period of development Preserved traditional mosques Built heritage conservation Herat Old City Afghanistan

Current surgical treatment of esophagogastric junction adenocarcinoma

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World Journal of Gastrointestinal Oncology 2019年第8期11卷 567-578页

作者： Shun Zhang hajime Orita Tetsu Fukunaga Department of Gastroenterology Surgery Shanghai East Hospital(East Hospital Affiliated to Tongji University)Shanghai 200120China Department of Gastroenterology and Minimally Invasive Surgery Juntendo University HospitalTokyo 113-8431Japan

The incidence of esophagogastric junction(EGJ)adenocarcinoma has shown an upward trend over the past several decades *** this article,we review previous studies and aimed to provide an update on the factors related to the surgical treatment of EGJ *** Siewert classification has implications for lymph node spread and is the most commonly used *** types of EGJ cancer have different incidences of mediastinal and abdominal lymph node metastases,and different surgical approaches have unique advantages and *** invasive surgeries have been increasingly applied in clinical practice and show comparable oncologic *** resection may be a good therapy for early EGJ ***,there is still a great need for well-designed,large RCTs to forward our knowledge on the surgical treatment of EGJ cancer.

关键词： Esophagogastric junction cancer Surgery Lymph nodes Siewert classification

Experiment and simulation of turbulent flow in local scour around a spur dyke

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International Journal of Sediment Research 2009年第1期24卷 33-45页

作者： hajime NAKAGAWA Kenji KAWAIKE Yasuyuki BABA Disaster Prevention Research Institute Kyoto University

The turbulent flow in the local scour hole around a single non-submerged spur dyke is investigated with both experimental and numerical methods. The experiments are conducted under clear-water scour regime with an impermeable spur dyke. The scour geometry and flow velocities are measured in details with a high-resolution laser displacement meter,electro-magnetic velocimetries and PIV(Particle image velocimetry). A 3D non-linear k-ε model is developed to simulate the complex local flow field around the scour area. The numerical model is formulated using FVM(Finite volume method) on a collocated unstructured mesh,capable of resolving complex geometries and boundaries. It is found that the simulation results are reasonably consistent with those of the experimental measurements. Based on the study results,the nature of the flow structure around a spur dyke with local scour hole is analyzed.

关键词： Spur dyke Local scour 3D flow Non-linear k-ε model Unstructured mesh

Bed morphology and grain size characteristics around a spur dyke

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International Journal of Sediment Research 2012年第2期27卷 141-155+157+156页

作者： Hao ZHANG hajime NAKAGAWA Hideaki MIZUTANI Disaster Prevention Research Institute Kyoto UniversityJapan 2. Department of Civil and Earth Resources EngineeringKyoto UniversityJapan

This paper presents an experimental study on the local bed morphology and grain size characteristics around an impermeable spur dyke.A series of experiments are conducted with different types of sediment *** is found that the heterogeneity of the sediment exerts an influence on detailed bed topographies around the spur dyke,but does not influence the typical features of scour-deposition *** mean grain size and the geometric standard deviation of the bed sediment are two important and practical parameters in characterizing the changes of the bed morphologies and the bed compositions around the spur *** sediment sorting process plays a crucial role in the grain size distribution,and the process occurs longitudinally,laterally and *** the proximity of the spur dyke,the bed is generally coarsened from upstream to downstream and sand ribbons consisting of fine particles are *** the scour hole,the bottom sediment is coarser than that at the top.

关键词： Spur dyke Non-uniform sediment Local scour Grain size distribution Sand ribbon

Molecular pathogenesis of sporadiccolorectal cancers

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Chinese Journal of Cancer 2016年第1期35卷 12-19页

作者： Hidetsugu Yamagishi hajime Kuroda Yasuo Imai Hideyuki Hiraishi Department of Diagnostic Pathology Dokkyo Medical University880 Kita‑KobayashiMibuShimotsugaTochigi 321‑0293Japan Department of Pathology International University of Health and Welfare Hospital537‑3 IguchiNasushiobaraTochigi 329‑2763Japan Department of Diagnostic Pathology Ota Memorial HospitalFuji Heavy Industries Health Insurance Society455‑1 OshimaOtaGunma 373‑8585Japan Department of Gastroenterology Dokkyo Medical University880 Kita‑KobayashiMibuShimotsugaTochigi 321‑0293Japan.

Colorectal cancer(CRC)results from the progressive accumulation of genetic and epigenetic alterations that lead to the transformation of normal colonic mucosa to *** 75%of CRCs are sporadic and occur in people without genetic predisposition or family history of *** the past two decades,sporadic CRCs were classified into three major groups according to frequently altered/mutated *** genes have been identified by linkage analyses of cancer-prone families and by individual mutation analyses of candidate genes selected on the basis of functional *** the first half of this review,we describe the genetic pathways of sporadic CRCs and their clinicopathologic ***,large-scale genome analyses have detected many infrequently mutated genes as well as a small number of frequently mutated *** infrequently mutated genes are likely described in a limited number of ***-oriented models of CRC progression are being replaced by pathway-oriented *** the second half of this review,we summarize the present knowledge of this research field and discuss its prospects.

关键词： Sporadic colorectal cancer, Pathogenesis, Morphology, Large-scale genome analysis, Genetic pathway

Activation of hypoxia-inducible factor 1 attenuates periapical inflammation and bone loss

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International Journal of Oral Science 2018年第2期10卷 92-101页

作者： Kimito Hirai Hisako Furusho Kiichi Hirota hajime Sasaki Department of Cariology Restorative Sciences & Endodontics University of Michigan School of Dentistry Department of Immunology and Infectious Diseases The Forsyth Institute Department of Oral and Maxillofacial Pathobiology Hiroshima University Department of Human Stress Response Science Institute of Biomedical Science Kansai Medical University

Hypoxia（low oxygen level） is an important feature during infections and affects the host defence mechanisms. The host has evolved specific responses to address hypoxia, which are strongly dependent on the activation of hypoxia-inducible factor 1（HIF-1）.Hypoxia interferes degradation of HIF-1 alpha subunit（HIF-1α）, leading to stabilisation of HIF-1α, heterodimerization with HIF-1 beta subunit（HIF-1β） and subsequent activation of HIF-1 pathway. Apical periodontitis（periapical lesion） is a consequence of endodontic infection and ultimately results in destruction of tooth-supporting tissue, including alveolar bone. Thus far, the role of HIF-1 in periapical lesions has not been systematically examined. In the present study, we determined the role of HIF-1 in a wellcharacterised mouse periapical lesion model using two HIF-1α-activating strategies, dimethyloxalylglycine（DMOG） and adenovirusinduced constitutively active HIF-1α（CA-HIF1 A）. Both DMOG and CA-HIF1 A attenuated periapical inflammation and tissue destruction. The attenuation in vivo was associated with downregulation of nuclear factor-κappa B（NF-κB） and osteoclastic gene expressions. These two agents also suppressed NF-κB activation and subsequent production of proinflammatory cytokines by macrophages. Furthermore, activation of HIF-1α by DMOG specifically suppressed lipopolysaccharide-stimulated macrophage differentiation into M1 cells, increasing the ratio of M2 macrophages against M1 cells. Taken together, our data indicated that activation of HIF-1 plays a protective role in the development of apical periodontitis via downregulation of NF-κB, proinflammatory cytokines, M1 macrophages and osteoclastogenesis.

关键词： CA Activation hypoxia-inducible factor attenuates periapical inflammation bone loss HIF