检索结果-南通市图书馆

Microstructure investigation and multicolor upconversion in Yb3+/Ln3+(Ln=Er/Tm/Ho) ions doped α-Sialon

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2019年第5期29卷 549-555页

作者： sang hoon jeong Yuwaraj K.Kshetri Seung Ho Kim Sung Hun Cho Soo W.Lee Department of Environment and Bio-Chemical Engineering Sun Moon University Research Center for Eco Multi-Functional Nano Materials Sun Moon University The Institute of Scientific and Industrial Research (ISIR) Osaka University

Yb3+/Ln3+(Ln=Er/Tm/Ho)-α-sialon ceramics were fabricated by hot press sintering *** microstructure and luminescent properties were studied by XRD,EDS,HRTEM and photoluminescence *** results showed that the sintered ceramics consisted ofα-Sialon with a trace amount ofβ-Sialon *** frequency upconversion and downconversion properties of Yb3+/Ln3+(Ln=Er/Tm/Ho)-α-Sialon ceramics were investigated under 980 nm low-power *** different concentrations of Yb3+/Ln3+(Ln=Er/Tm/Ho)produced multicolor emissions characteristics of each Ln3+ion as a result of the energy transfer from Yb3+to Er3+,Tm3+and Ho3+*** EDS spectra measurements and mappings showed that the Ln3+ions were well incorporated in theα-Sialon *** evolution of the emission decay behavior has been investigated to understand the energy transfer mechanism.

关键词： α-Sialon Hot press sintering Upconversion Energy transfer

Functions of transcription factor superfamilies in rice immunity

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

The Crop Journal 2025年第1期13卷 5-22页

作者： sang Ryeol Park Yujeong jeong Seungmin Son National Institute of Agricultural Sciences Rural Development AdministrationJeonju 54874Republic of Korea Department of Crop Science and Biotechnology Jeonbuk National UniversityJeonju 54896Republic of Korea

The emergence of novel phytopathogens and the accelerated spread of plant diseases to new regions,driven by global climate change,constitute significant threats to agricultural ***,a major tropical staple crucial for global food security,possesses six transcription factor superfamilies-AP2/ERF,bHLH,bZIP,MYB,NAC,and WRKY-that function in innate immunity against *** review their biological functions and regulatory mechanisms in rice immunity.

关键词： Biotic stress Crop resilience Immune response Rice Transcription factor

Data driven prediction of fragment velocity distribution under explosive loading conditions

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Defence Technology(防务技术) 2025年第1期43卷 109-119页

作者： Donghwan Noh Piemaan Fazily Songwon Seo Jaekun Lee Seungjae Seo hoon Huh jeong Whan Yoon Department of Mechanical Engineering Korea Advanced Institute of Science and Technology291 Daehak-roYuseong-guDaejeon 34141Republic of Korea Warhead System Team Precision Firepower Research DivisionPOONGSAN Defense R&D Institute2606-10 Hoguk-roAngang-OupKyung JuKyung-BukRepublic of Korea School of Engineering Deakin UniversityWauran PondsVIC 3216Australia

This study presents a machine learning-based method for predicting fragment velocity distribution in warhead fragmentation under explosive loading *** fragment resultant velocities are correlated with key design parameters including casing dimensions and detonation *** paper details the finite element analysis for fragmentation,the characterizations of the dynamic hardening and fracture models,the generation of comprehensive datasets,and the training of the ANN *** results show the influence of casing dimensions on fragment velocity distributions,with the tendencies indicating increased resultant velocity with reduced thickness,increased length and *** model's predictive capability is demonstrated through the accurate predictions for both training and testing datasets,showing its potential for the real-time prediction of fragmentation performance.

关键词： Data driven prediction Dynamic fracture model Dynamic hardening model Fragmentation Fragment velocity distribution High strain rate Machine learning

Nasal cavity fungus ball discovered accidentally:A case report

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2025年第5期13卷 44-48页

作者： Dae-Neung Lee Dong hoon Lee sang Chul Lim Department of Otolaryngology-Head and Neck Surgery Chonnam National University Medical SchoolChonnam National University Hwasun HospitalHwasun 58128South Korea Department of Otolaryngology-Head and Neck Surgery Chonnam National University Medical SchoolHwasun HospitalChonnam National University Hwasun HospitalHwasun 58128South Korea Department of Otolaryngology-Head and Neck Surgery Chonnam National University Medical SchoolKwangju 501190South Korea

BACKGROUND Fungal balls within the nasal cavity are an exceedingly rare clinical entity,typically presenting with nonspecific symptoms or being identified *** SUMMARY This report presents an incidental discovery of a fungal ball in the nasal cavity during routine imaging,with no associated clinical *** This case underscores the importance of considering the possibility of asympto-matic presentations of nasal fungal balls,which may be detected incidentally during imaging evaluations.

关键词： Fungi Mycoses Fungus ball Nasal cavity Nasal surgical procedures Case report

High cellular prion protein expression in cholangiocarcinoma:A marker for early postoperative recurrence and unfavorable prognosis

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 Gastrointestinal Surgery 2025年第3期17卷 267-277页

作者： Dong Woo Shin Yoon Ah Cho Sung-hoon Moon Tae Hyung Kim Ji-Won Park Jung-Woo Lee Ji-Young Choe Min-jeong Kim Sung-Eun Kim Department of Internal Medicine Hallym University Sacred Heart HospitalHallym University College of MedicineAnyang 14068Gyeonggi-doSouth Korea Department of Pathology and Translational Genomics Samsung Medical CenterSungkyunkwan University School of MedicineSeoul 06351South Korea Department of Surgery Hallym University Sacred Heart HospitalHallym University College of MedicineAnyang 14068South Korea Anatomic Pathology Reference Lab Seegene Medical FoundationSeoul 04805South Korea Department of Radiology Hallym University Sacred Heart HospitalHallym University College of MedicineAnyang 14068South Korea

BACKGROUND The cellular prion protein(PrPC),traditionally associated with neurodegenerative disorders,plays an important role in cancer progression and metastasis by inhibiting *** To investigate the influence of PrPC expression in cholangiocarcinoma(CCA)on patient outcomes following surgical *** Patients who underwent curative surgical resection for either intrahepatic or hilar CCA were enrolled in this retrospective *** on the immunohistochemical staining results of the surgical specimens,patients were categorized into two groups:The low PrPC group(negative or 1+)and the high PrPC group(2+or 3+).Survival analyses,including overall survival and recurrence-free survival,were conducted using the Kaplan-Meier method and compared using the log-rank *** In total,seventy-six patients diagnosed with CCA(39 with intrahepatic and 37 with hilar CCA)underwent curative hepatectomy from January 2011 to November *** these patients,38(50%)demonstrated high PrPC expression,whereas the remaining 38(50%)showed low expression of *** a median follow-up period of 31.2 months(range:1 to 137 months),the high PrPC group had a significantly shorter median overall survival than the low PrPC group(40.4 months vs 137.9 months,respectively;P=0.041).Moreover,the high PrPC group had a significantly shorter median recurrence-free survival than the low PrPC group(13.3 months vs 23.8 months,respectively;P=0.026).CONCLUSION PrPC expression is significantly associated with early recurrence and decreased survival period in CCA patients following surgical ***,PrPC may be used as a prognostic factor in treatment planning.

关键词： Cholangiocarcinoma Cellular prion protein Liver neoplasms Prognosis Recurrence Survival

Dynamic deformation behavior and microstructural evolution during high-speed rolling of Mg alloy having non-basal texture

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 Materials Science & Technology 2019年第4期35卷 473-482页

作者： sang-hoon Kim jeong Hun Lee Chong Soo Lee Jonghun Yoon Sung Hyuk Park School of Materials Science and Engineering Kyungpook National University Ulsan Regional Division Korea Institute of Industrial Technology Graduate Institute of Ferrous Technology Pohang University of Science and Technology Department of Mechanical Engineering Hanyang University

The dynamic deformation behaviors and resultant microstructural variations during high-speed rolling(HSR) of a Mg alloy with a non-basal texture are investigated. To this end, AZ31 alloy samples in which the basal poles of most grains are predominantly aligned parallel to the transverse direction(TD) are subjected to hot rolling with different reductions at a rolling speed of 470 m/min. The initial grains with a TD texture are favorable for {10–12} twinning under compression along the normal direction(ND); as a result, {10–12} twins are extensively formed in the material during HSR, and this consequently results in a drastic evolution of texture from the TD texture to the ND texture and a reduction in the grain size. After the initial grains are completely twinned by the {10–12} twinning mechanism, {10–11} contraction twins and {10–11}-{10–12} double twins are formed in the {10–12} twinned grains by further *** the contraction twins and double twins have crystallographic orientations that are favorable for basal slip during HSR, dislocations easily accumulate in these twins and fine recrystallized grains nucleate in the twins to reduce the increased internal strain energy. Until a rolling reduction of 20%, {10–12}twinning is the main mechanism governing the microstructural change during HSR, and subsequently,the microstructural evolution is dominated by the formation of contraction twins and double twins and the dynamic recrystallization in these twins. With an increase in the rolling reduction, the average grain size and internal strain energy of the high-speed-rolled(HSRed) samples decrease and the basal texture evolves from the TD texture to the ND texture more effectively. As a result, the 80% HSRed sample, which is subjected to a large strain at a high strain rate in a single rolling pass, exhibits a fully recrystallized microstructure consisting of equiaxed fine grains and has an ND basal texture without a TD texture component.

关键词： Magnesium alloy High-speed rolling Texture Dynamic recrystallization Twinning

Dynamic recrystallization behavior and microstructural evolution of Mg alloy AZ31 through high-speed rolling

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2018年第10期34卷 1747-1755页

作者： jeong Hun Lee Jong Un Lee sang-hoon Kim Seok Weon Song Chong Soo Lee Sung Hyuk Park Ulsan Regional Division Korea Institute of Industrial Technology School of Materials Science and Engineering Kyungpook National University Technical Research Laboratories POSCO Graduate Institute of Ferrous Technology Pohang University of Science and Technology

High-speed rolling （HSR） is known to improve the workability of Mg alloys significantly, which makes it possible to impose a large reduction in a single pass without fracture. In the present study, dynamic recrystallization （DRX） behavior and microstructural and textural variations of Mg alloy AZ31 dur-ing a HSR process were investigated by conducting rolling with different imposed reductions in the range of 20%-80% at a high rolling speed of 470 m/min and 400℃. High-strain-rate deformation during HSR suppresses dislocation slips but promotes twinning, which results in the formation of numer-ous twins of several types, i.e., {10-12} extension twins, {10-11} and {10-13} contraction twins, and {10-11}-{10-12} double twins. After twinning, high strain energy is accumulated in twin bands because their crystallographic orientations are favorable for basal slips, leading to subsequent DRX at the twin bands. Accordingly, twinning activation and twinning-induced DRX behavior play crucial roles in accommodating plastic deformation during HSR and in varying microstructure and texture of the high- speed-rolled （HSRed） sheets. Area fraction of fine DRXed grains formed at the twin bands increases with increasing rolling reduction, which is attributed to the combined effects of increased strain, strain rate, and deformation temperature and a decreased critical strain for DRX. Size, internal strain, and texture intensity of the DRXed grains are smaller than those of unDRXed grains. Therefore, as rolling reduction increases, average grain size, stored internal energy, microstructural inhomogeneity, and basal texture intensity of the HSRed sheets gradually decrease owing to an increase in the area fraction of the DRXed grains.

关键词： Magnesium alloy High-speed rolling Twinning Dynamic recrystallization Microstructure

Induced atrial fibrillation during defibrillation test on implantation of subcutaneous implantable cardioverter defibrillator

在线全文

学校读者我要写书评

暂无评论

Journal of Geriatric Cardiology 2020年第8期17卷 525-527页

作者： Ki-Hun Kim sang-hoon Seol Jino Park Yeo-jeong Song Seunghwan Kim Dong-Kie Kim Division of Cardiology Department of Internal MedicineHaeundae Paik HospitalInje University College of MedicineBusanKorea

The subcutaneous implantable cardioverter defibrillator(S-ICD)has become an alternative to the transvenous ICD in indicated ***,inappropriate shock or failed ventricular tachycardia/fibrillation conversion is the most... 详细信息

关键词： Atrial fibrillation Defibrillation test Subcutaneous implantable cardioverter defibrillator

Distributed Coordinator Election Scheme for QoS Support and Seamless Connectivity in WPANs

在线全文

学校读者我要写书评

暂无评论

Journal of Computer Science & Technology 2009年第6期24卷 1138-1148页

作者： Soon-Gyu jeong sang-Jo Yoo Graduate School of Information Technology & Telecommunications Inha University

Wireless personal area networks （WPANs） are formed in a relatively small area, and coordinator that serves as a central control device plays an important role in the operation and organization of a piconet. Typical applications of WPANs include home automation systems, security systems and health monitoring systems. In these types of systems, guaranteeing seamless connectivity is very important, and communications cannot take place when the coordinator malfunctions. Thus, in the case of a breakdown, it is necessary to elect a new coordinator as soon as possible. For this reason, a distributed coordinator election scheme （DCES） is proposed that considers not only QoS support but also network connectivity in an effort to avoid possible network partition. Simulation results show that the proposed scheme can elect a new coordinator while maintaining QoS and guaranteeing connectivity for a limited period.

关键词： QoS seamless connectivity leader election piconet coordinator (PNC) wireless personal area network (WPAN)