检索结果-南通市图书馆

Laser-assisted direct roller imprinting of large-area microstructured optical surfaces

在线全文

学校读者我要写书评

暂无评论

Microsystems & Nanoengineering 2024年第1期10卷 257-266页

作者： Keisuke Nagato Ken takahashi Yuki Yajima Masayuki Nakao Department of Mechanical Engineering Graduate School of EngineeringThe University of Tokyo7-3-1 HongoBunkyo-kuTokyo 113-8656Japan

In this study,a high-throughput fabrication method called laser-assisted direct roller imprinting(LADRI)was developed to lower the cost of nanoimprinting large-area polymer films and to address problems associated with nanoimprinting,namely,microstructural damage and precision in flatness of entire film.With LADRI,the laser directly heats the microstructured surface of the roller mold,which heats and melts the surface of a polymethyl methacrylate(PMMA)film to replicate the microstructures on the mold rapidly.In this study,the effects of laser power density,scanning speed,size of the microstructures,and contact pressure on the replication speed were investigated experimentally.The replication speed increased as the power and scanning speed increased.However,because the film required heating until it filled the entire depth of the microstructure,an appropriate replication speed was necessary.This result was supported by simulation of the temperature distribution inside the mold and the PMMA using transient heat conduction analyses.To demonstrate the applications of LADRI,two different optical surfaces were replicated:an antireflection(AR)structure with conical structures sized several hundred nanometers and a lightextraction structure with a microlens array(MLA)comprising 10μm lenses,for display and illumination,respectively.The replication degree of the MLA was governed by the contact pressure.Polymer flow simulation indicated that the heat conduction and flow speeds of the melted PMMA surface were comparable within several tens of micrometers.In addition,the reflectivity of the AR structure decreased from 4 to 0.5%,and the light intensity of the light-extraction structure increased by a factor of 1.47.

关键词： microstructure roller conduction

Fragmented QRS complex with an additional R-wave attenuated by short RR interval in a patient with acute pulmonary embolism and cardiogenic shock

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Geriatric Cardiology 2022年第12期19卷 995-1000页

作者： koji takahashi Hiromasa Nakahara Eiji Arimitsu Satoshi Imamine Yoshiyasu Obata Kimio Nakanishi Yoshiyasu Taniguchi Maiko Amano Chika Omori Takafumi Okura Department of Community Emergency Medicine Ehime University Graduate School of MedicineEhimeJapan Department of Cardiology Yawatahama City General HospitalEhimeJapan Department of Internal Medicine Oozu City HospitalEhimeJapan Department of Clinical Laboratory Oozu City HospitalEhimeJapan

Registries and hospital discharge datasets of unselected patients with pulmonary embolism show 30-day all-cause mortality rates of approximately 10%.[1]Clinical findings from histories and physical examinations,such as age,systemic blood pressure,and respiratory rate at presentation,classify patients into risk classes of increasing risk of death and other adverse medical outcomes.

关键词： mortality patients Clinical

Unfamiliar waveforms spanning from the ST to TP segments only observed in certain limb leads of the standard 12-lead electrocardiogram due to Aslanger’ s sign

在线全文

学校读者我要写书评

暂无评论

老年心脏病学杂志:英文版 2023年第9期20卷 693-696页

作者： koji takahashi Nobuhisa Yamamura Mako Yoshino Daijiro Enomoto Hiroe Morioka Shigeki Uemura Takafumi Okura Tomoki Sakaue Shuntaro Ikeda Department of Community Emergency Medicine Ehime University Graduate School of MedicineEhimeJapan Department of Cardiology Yawatahama City General HospitalEhimeJapan Department of Clinical Pathology Yawatahama City General HospitalEhimeJapan

Aslanger’s sign,also known as the arterial pulse tapping artifact or electromechanical association artifact,is an electrocardiographic artifact caused by arterial pulsation at the site where the limb leads of the standard 12-lead electrocardiogram near the radial or posterior tibial arteries are positioned,particularly in hyperdynamic states.[1–8]It occurs in every cardiac cycle with a constant coupling interval between the QRS complex and artifact.This synchronization with the underlying heart rhythm makes it less likely to be recognized as an artifact compared to unsynchronized artifacts,such as those caused by limb movement and inadequate contact between the electrode and skin.[1,2,7,8]Almost all reported cases of Aslanger’s sign exhibit an unusual waveform morphology in all 12 leads except one of the standard 12-lead electrocardiogram.This sign is often confused with an electrocardiographic finding commonly observed during acute coronary events.

关键词： electrocardiogram arterial likely

Light chain cardiac amyloidosis in a nonagenarian

在线全文

学校读者我要写书评

暂无评论

Journal of Geriatric Cardiology 2022年第1期19卷 83-89页

作者： koji takahashi Mina Yamashita Tomoki Sakaue Daijiro Enomoto Shigeki Uemura Takafumi Okura Shuntaro Ikeda Takanori Senba Akira Saijo Nobuhisa Yamamura Sohei Kitazawa Department of Community Emergency Medicine Ehime University Graduate School of MedicineEhimeJapan Department of Cardiology Yawatahama City General HospitalEhimeJapan Department of Hematology Yawatahama City General HospitalEhimeJapan Department of Clinical Pathology Yawatahama City General HospitalEhimeJapan Department of Molecular Pathology Ehime University Graduate School of MedicineEhimeJapan

Cardiac amyloidosis is an infiltrative and restrictive cardiomyopathy caused by the extracellular deposition of amyloid fib-rils within the heart as systemic amyloidosis,lead-ing to heart failure,reduced quality of life,and death.[1]There are two major amyloid fibril proteins that af-fect the heart:amyloid immunoglobulin light chain(AL)and amyloid transthyretin(ATTR).The latter is further subdivided into wild-type ATTR and variant types based on the presence of a mutation in the transthyretin gene.

关键词： amyloid death. cardiomyopathy

Nondestructive and active interrogation system for special nuclear material:proof of principle and initial results

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2024年第5期35卷 216-225页

作者： Mahmoud Bakr Kai Masuda Yoshiyuki takahashi Tsuyoshi Misawa Norio Yamakawa Tomas Scott Institute of Advanced Energy Kyoto UniversityGokashoUjiKyoto 611‑0011Japan School of Physics University of BristolBs81TL Tyndall AvenueBristolUK Physics Department Faculty of ScienceAssiut UniversityAssiut 71516Egypt Research Reactor Institute Kyoto University2 Asashiro‑NishiKumatoriOsaka 590‑0494Japan Pony Industry Co.Ltd. 2‑3‑6 Kitakyuhoji‑MachiChuo‑KuOsaka 541‑0057Japan Astral Neutronics LTD Unit H5HallenBristol BS107SBUK

Herein,we employ the threshold energy neutron analysis(TENA)technique to introduce the world's first active interrogation system to detect special nuclear materials(SNMs),including U-235 and Pu-239.The system utilizes a DD neutron generator based on inertial electrostatic confinement(IEC)to interrogate suspicious objects.To detect secondary neutrons produced during fission reactions induced in SNMs,a tensioned metastable fluid detector(TMFD)is employed.The current status of the system's development is reported in this paper,accompanied by the results from experiments conducted to detect 10 g of highly enriched uranium(HEU).Notably,the experimental findings demonstrate a distinct difference in the count rates of measurements with and without HEU.This difference in count rates surpasses two times the standard deviation,indicating a confidence level of more than 96% for identifying the presence of HEU.The paper presents and extensively discusses the proof-of-principle experimental results,along with the system's planned trajectory.

关键词： Special nuclear materials Uranium detection Inertial electrostatic confinement fusion TENA HEU CTMFD

Collapse Behavior of Pipe-Framed Greenhouses with and without Reinforcement under Snow Loading:A 3-D Finite Element Analysis

在线全文

学校读者我要写书评

暂无评论

Journal of Civil Engineering and Architecture 2024年第2期18卷 51-59页

作者： Yasushi Uematsu Kazuya takahashi New Industry Creation Hatchery Center Tohoku UniversitySendai 980-8579Japan Engineering Headquarters Shimizu CorporationChuo-kuTokyo 104-8370Japan

The present paper first investigates the collapse behavior of a conventional pipe-framed greenhouse under snow loading based on a 3-D finite element analysis,in which both geometrical and material non-linearities are considered.Three snow load distribution patterns related to the wind-driven snow particle movement are used in the analysis.It is found that snow load distribution affects the deformation and collapse behavior of the pipe-framed greenhouse significantly.The results obtained in this study are consistent with the actual damage observed.Next,discussion is made of the effects of reinforcements by adding members to the basic frame on the strength of the whole structure,in which seven kinds of reinforcement methods are examined.A buckling analysis is also carried out.The results indicate that the most effective reinforcement method depends on the snow load distribution pattern.

关键词： Pipe-framed greenhouse snow loading collapse buckling finite element analysis

Preoperative albumin-bilirubin score and liver resection percentage determine postoperative liver regeneration after partial hepatectomy

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2024年第14期30卷 2006-2017页

作者： Kazuhiro takahashi Masahiko Gosho Yoshihiro Miyazaki Hiromitsu Nakahashi Osamu Shimomura Kinji Furuya Manami Doi Yohei Owada Koichi Ogawa Yusuke Ohara Yoshimasa Akashi Tsuyoshi Enomoto Shinji Hashimoto Tatsuya Oda Department of Gastrointestinal and Hepatobiliary-Pancreatic Surgery University of TsukubaTsukuba 3058-575IbarakiJapan Department of Biostatistics University of TsukubaTsukuba 3058-575IbarakiJapan

BACKGROUND The success of liver resection relies on the ability of the remnant liver to regenerate.Most of the knowledge regarding the pathophysiological basis of liver regeneration comes from rodent studies,and data on humans are scarce.Additionally,there is limited knowledge about the preoperative factors that influence postoperative regeneration.AIM To quantify postoperative remnant liver volume by the latest volumetric software and investigate perioperative factors that affect posthepatectomy liver regenera-tion.METHODS A total of 268 patients who received partial hepatectomy were enrolled.Patients were grouped into right hepatectomy/trisegmentectomy(RH/Tri),left hepa-tectomy(LH),segmentectomy(Seg),and subsegmentectomy/nonanatomical hepatectomy(Sub/Non)groups.The regeneration index(RI)and late rege-neration rate were defined as(postoperative liver volume)/[total functional liver volume(TFLV)]×100 and(RI at 6-months-RI at 3-months)/RI at 6-months,respectively.The lower 25th percentile of RI and the higher 25th percentile of late regeneration rate in each group were defined as“low regeneration”and“delayed regeneration”.“Restoration to the original size”was defined as regeneration of the liver volume by more than 90%of the TFLV at 12 months postsurgery.RESULTS The numbers of patients in the RH/Tri,LH,Seg,and Sub/Non groups were 41,53,99 and 75,respectively.The RI plateaued at 3 months in the LH,Seg,and Sub/Non groups,whereas the RI increased until 12 months in the RH/Tri group.According to our multivariate analysis,the preoperative albumin-bilirubin(ALBI)score was an independent factor for low regeneration at 3 months[odds ratio(OR)95%CI=2.80(1.17-6.69),P=0.02;per 1.0 up]and 12 months[OR=2.27(1.01-5.09),P=0.04;per 1.0 up].Multivariate analysis revealed that only liver resection percentage[OR=1.03(1.00-1.05),P=0.04]was associated with delayed regeneration.Furthermore,multivariate analysis demonstrated that the preoperative ALBI score[OR=2.63(1.00-1.05),P=0.02;per 1.0 up]and liver resection percentage[OR=1.02(1.00

关键词： Liver regeneration Albumin-bilirubin score Liver resection percentage Partial hepatectomy Human Regeneration index

Using Cross Entropy as a Performance Metric for Quantifying Uncertainty in DNN Image Classifiers: An Application to Classification of Lung Cancer on CT Images

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Biomedical Science and Engineering 2024年第1期17卷 1-12页

作者： Eri Matsuyama Masayuki Nishiki Noriyuki takahashi Haruyuki Watanabe Faculty of Informatics University of Fukuchiyama Kyoto Japan Graduate School of Radiological Sciences International University of Health and Welfare Tochigi Japan School of Health Sciences Fukushima Medical University Fukushima Japan School of Radiological Technology Gunma Prefectural College of Health Sciences Gunma Japan

Cross entropy is a measure in machine learning and deep learning that assesses the difference between predicted and actual probability distributions. In this study, we propose cross entropy as a performance evaluation metric for image classifier models and apply it to the CT image classification of lung cancer. A convolutional neural network is employed as the deep neural network (DNN) image classifier, with the residual network (ResNet) 50 chosen as the DNN archi-tecture. The image data used comprise a lung CT image set. Two classification models are built from datasets with varying amounts of data, and lung cancer is categorized into four classes using 10-fold cross-validation. Furthermore, we employ t-distributed stochastic neighbor embedding to visually explain the data distribution after classification. Experimental results demonstrate that cross en-tropy is a highly useful metric for evaluating the reliability of image classifier models. It is noted that for a more comprehensive evaluation of model perfor-mance, combining with other evaluation metrics is considered essential. .

关键词： Cross Entropy Performance Metrics DNN Image Classifiers Lung Cancer Prediction Uncertainty

Slip Flow on Graphene:Current Status and Perspective

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Thermal Science 2022年第4期31卷 1115-1134页

作者： CHEN Kuan-Ting LI Qin-Yi takahashi koji Department ofAeronautics and Astronautics Kyushu UniversityFukuoka 819-0395Japan International Institute for Carbon-Neutral Energy Research(WPI-I2CNER) Kyushu UniversityFukuoka 819-0395Japan

Fast fluid transport on graphene has attracted a growing body of research due to a wide range of potential applications including thermal management,water desalination,energy harvesting,and lab-on-a-chip.Here,we critically review the theoretical,simulational,and experimental progress regarding the fluid slippage on graphene.Based on the summary of the past studies,we give perspectives on future research directions towards complete understanding and practical applications of slip flow on graphene.

关键词： slip flow graphene nanochannel simulation experiment