检索结果-南通市图书馆

Driving inward growth of lithium metal in hollow microcapsule hosts by heteroatom‐controlled nucleation

在线全文

学校读者我要写书评

暂无评论

Carbon Energy 2024年第8期6卷 262-272页

作者： Siwon kim Hong Rim Shin Ki Jae kim Min‐sik Park Jong‐Won Lee Division of Materials Science and Engineering Hanyang UniversitySeoulRepublic of Korea Department of Energy Science and Engineering Daegu Gyeongbuk Institute of Science and Technology(DGIST)DaeguRepublic of Korea Department of Energy Science Sungkyunkwan UniversitySuwonRepublic of Korea Department of Advanced Materials Engineering for Information and Electronics Integrated Education for Frontier Science and Technology(BK21 Four)Kyung Hee UniversityYonginRepublic of Korea

The application of Li metal anodes in rechargeable batteries is impeded by safety issues arising from the severe volume changes and formation of dendritic Li ***‐dimensional hollow carbon is receiving increasing attention as a host material capable of accommodating Li metal inside its cavity;however,uncontrollable and nonuniform deposition of Li remains a *** this study,we synthesize metal–organic framework‐derived carbon microcapsules with heteroatom clusters(Zn and Ag)on the capsule walls and it is demonstrated that Ag‐assisted nucleation of Li metal alters the outward‐to‐inward growth in the microcapsule ***‐incorporated microcapsules are prepared via chemical etching of zeolitic imidazole framework‐8 polyhedra and are subsequently decorated with Ag by a galvanic displacement reaction between Ag^(+) and metallic *** introduced Ag significantly reduces the energy barrier and increases the reaction rate for Li nucleation in the microcapsule host upon Li *** combined electrochemical,microstructural,and computational studies,we verify the beneficial role of Ag‐assisted Li nucleation in facilitating inward growth inside the cavity of the microcapsule host and,in turn,enhancing electrochemical *** study provides new insights into the design of reversible host materials for practical Li metal batteries.

关键词： hollow carbon hosts lithium metal batteries lithium plating metal-organic frameworks nucleation

2.47 GPa grade ultra-strong 15Co-12Ni secondary hardening steel with superior ductility and fracture toughness

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 2021年第7期66卷 36-45页

作者： Young-Kyun kim Kyu-sik kim Young-Beum Song Jung Hyo Park Kee-Ahn Lee Department of Materials Science and Engineering Inha UniversityIncheon22212Republic of Korea Agency for Defense Development(ADD) Yuseong-guDaegeon34186Republic of Korea

This study investigated the effect of multi-step heat treatment on the microstructure, mechanical properties and fracture behavior of thick 15 Co-12 Ni secondary hardening steel. As-quenched sample was found to have elongated prior austenite grain(PAG) and coarse lenticular martensitic structure. On the other hand, heat-treated sample was observed to have fine lenticular martensitic structure due to fine PAG size and a lot of nano-sized carbides. Also, after heat treatment, nano-scale reverted austenite film was formed at the martensite interfaces. The heat-treated sample showed 2.47 GPa superior tensile strength and superior elongation of about 12 %. The high strength was mainly due to fine block size and high number density of nano-sized carbides. The average value of plane strain fracture toughness(KIC) was 29.3 MPa m1/2, which indicated a good fracture toughness even with the high tensile strength. The tensile fracture surface was observed to have ductile fracture mode(cup-and-cone) and the formation of about ~1 μm ultra-fine dimples. In addition to this, nano-sized carbides were observed within the *** findings suggested that the nano-sized carbide had a positive effect not only on the strength but also on the ductility of the alloy. The fractured surface after toughness test, also showed ductile fracture mode with a lot of dimples. Based on the above results, correlation among microstructural evolution,deformation and fracture mechanisms along the heat-treatment was also discussed.

关键词： Ultra-high strength High Co-Ni secondary hardening steel Microstructure Tensile properties Fracture toughness Reverted austenite

Optimal proximal resection margin distance for gastrectomy in advanced gastric cancer

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2020年第18期26卷 2232-2246页

作者： Amy kim Beom Su kim Jeong Hwan Yook Byung sik kim Division of Stomach Surgery Department of SurgeryAsan Medical CenterUniversity of Ulsan College of MedicineSeoul 05505South Korea Department of Surgery Korea University Medical Center Ansan HospitalAnsanGyeonggi-do 15355South Korea

BACKGROUND The conventional guidelines to obtain a safe proximal resection margin(PRM)of5-6 cm during advanced gastric cancer(AGC)surgery are still applied by many surgeons across the *** recent studies have raised questions regarding the need for such extensive resection,but without reaching *** study was designed to prove that the PRM distance does not affect the prognosis of patients who undergo gastrectomy for *** To investigate the influence of the PRM distance on the prognosis of patients who underwent gastrectomy for *** Electronic medical records of 1518 patients who underwent curative gastrectomy for AGC between June 2004 and December 2007 at Asan Medical Center,a tertiary care center in Korea,were reviewed retrospectively for the *** demographics and clinicopathologic outcomes were compared between patients who underwent surgery with different PRM distances using one-way ANOVA and Fisher’s exact test for continuous and categorical variables,*** influence of PRM on recurrence-free survival and overall survival were analyzed using Kaplan-Meier survival analysis and Cox proportional hazard *** The median PRM distance was 4.8 cm and 3.5 cm in the distal gastrectomy(DG)and total gastrectomy(TG)groups,*** cohorts in the DG and TG groups were subdivided into different groups according to the PRM distance;≤1.0 cm,1.1-3.0 cm,3.1-5.0 cm and>5.0 *** DG and TG groups showed nostatistical difference in recurrence rate(23.5%vs 30.6%vs 24.0%vs 24.7%,P=0.765)or local recurrence rate(5.9%vs 6.5%vs 8.4%vs 6.2%,P=0.727)according to the distance of *** both groups,Kalpan-Meier analysis showed no statistical difference in recurrence-free survival(P=0.467 in DG group;P=0.155 in TG group)or overall survival(P=0.503 in DG group;P=0.155 in TG group)according to the PRM *** analysis using Cox proportional hazard model revealed that in both groups,there was no significant differ

关键词： Stomach neoplasms Gastrectomy Margins of excision Prognosis Recurrence

Band dynamics accompanied by bound states in the continuum at the third-orderΓpoint in leaky-mode photonic lattices

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Photonics Research 2021年第6期9卷 1109-1116页

作者： sun-GOO LEE SEONG-HAN kim CHUL-sik KEE Integrated Optics Laboratory Advanced Photonics Research InstituteGISTGwangju 61005Republic of Korea

Bound states in the continuum(BICs)and Fano resonances in planar photonic lattices,including metasurfaces and photonic-crystal slabs,have been studied extensively in recent ***,the BICs and Fano resonances are associated with the second stop bands open at the second-order Γ *** paper addresses the fundamental properties of the fourth stop band accompanied by BICs at the third-order Γ point in one-dimensional leakymode photonic *** the fourth stop band,one band edge mode suffers radiation loss,thereby generating a Fano resonance,while the other band edge mode becomes a nonleaky *** fourth stop band is controlled primarily by the Bragg processes associated with the first,second,and fourth Fourier harmonic components of the periodic dielectric constant *** interplay between these three major processes closes the fourth band gap and induces a band flip whereby the leaky and BIC edges transit across the fourth band *** the fourth stop band,an accidental BIC is formed owing to the destructive interplay between the first and second Fourier *** the fourth band gap closes with strongly enhanced radiative Q factors,Dirac cone dispersions can appear at the third-order Γ point.

关键词： lattices continuum harmonics

Altered physiology of mesenchymal stem cells in the pathogenesis of adolescent idiopathic scoliosis

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2020年第11期8卷 2102-2110页

作者： Dai sik Ko Yun Hak kim Tae sik Goh Jung Sub Lee Division of Vascular Surgery Department of SurgeryGachon University Gil Medical CenterIncheoz 21565South Korea Department of Anatomy and Department of Biomedical Informatics School of MedicinePusan National UniversityYangsan 50612South Korea Department of Orthopaedic Surgery and Biomedical Research Institute Pusan National University HospitalBusan 49241South Korea

Adolescent idiopathic scoliosis is the most common spinal deformity during puberty,especially in *** is characterized by aberrant skeletal growth and generalized reduced bone density,which is associated with impaired bone mineral *** recent progress in multidisciplinary research to support various hypotheses,the pathogenesis of Adolescent idiopathic scoliosis is still not clearly *** of the hypothesis is to study the role of mesenchymal stem cells due to its involvement in the above-mentioned bone metabolic *** this review,we will summarize reported literatures on the role of mesenchymal stem cells,particularly in the pathogenesis of Adolescent idiopathic *** addition,we will describe the research on mesenchymal stem cells of Adolescent idiopathic scoliosis performed using bioinformatics tools.

关键词： Adolescent idiopathic scoliosis Mesenchymal stem cell Bioinformatics Transcriptome Proteome

CD200Rhigghh neutrophils with dysfunctional autophagy establish systemic immunosuppression by increasing regulatory T cells

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Cellular & Molecular Immunology 2024年第4期21卷 349-361页

作者： Ye Seon kim Yu sun Jeong Geon Ho Bae Ji Hyeon Kang Mingyu Lee Brian A.Zabel Yoe-sik Bae Department of Biological Sciences Sungkyunkwan UniversitySuwon16419Republic of Korea Department of Health Science and Technology SAIHSTSungkyunkwan UniversitySeoul06351Republic of Korea Palo Alto Veterans Institute for Research Veterans Affairs HospitalPalo AltoCA94304USA

Distinct neutrophil populations arise during certain pathological *** generation of dysfunctional neutrophils during sepsis and their contribution to septicemia-related systemic immune suppression remain *** this study,using an experimental sepsis model that features immunosuppression,we identified a novel population of pathogenic CD200R^(high) neutrophils that are generated during the initial stages of sepsis and contribute to systemic immune suppression by enhancing regulatory T(T_(reg))*** to their CD200R^(low)counterparts,sepsis-generated CD200Rhigh neutrophils exhibit impaired autophagy and dysfunction,with reduced chemotactic migration,superoxide anion production,and TNF-α*** soluble CD200 blocks autophagy and neutrophil maturation in the bone marrow during experimental sepsis,and recombinant CD200 treatment in vitro can induce neutrophil dysfunction similar to that observed in CD200R^(high) *** administration of anα-CD200R antibody effectively reversed neutrophil dysfunction by enhancing autophagy and protecting against a secondary infection challenge,leading to increased *** analysis revealed that CD200R^(high) neutrophils expressed high levels of Igf1,which elicits the generation of Treg cells,while the administration of anα-CD200R antibody inhibited Treg cell generation in a secondary infection *** together,our findings revealed a novel CD200R^(high) neutrophil population that mediates the pathogenesis of sepsis-induced systemic immunosuppression by generating Treg cells.

关键词： Sepsis Neutrophils CD200R Autophagy IGF-1 Regulatory T cells

Relief of YAP-mediated inhibition by IKKε promotes innate antiviral immunity

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Cellular & Molecular Immunology 2018年第6期15卷 642-644页

作者： Nayoung kim Yun-Yong Park Chul Hyun Joo Hun sik kim Department of Convergence Medicine Asan Medical CenterUniversity of Ulsan College of MedicineSeoul 05505Korea Asan Institute for Life Sciences Asan Medical CenterUniversity of Ulsan College of MedicineSeoul 05505Korea Department of Microbiology Asan Medical CenterUniversity of Ulsan College of MedicineSeoul 05505Korea Department of Biomedical Sciences Asan Medical CenterUniversity of Ulsan College of MedicineSeoul 05505Korea

The innate immune response to invading viruses is critical for the mounting of protective immunity,in which type I interferons(IFN),for example,IFN-αandβ,are potent effector molecules.1 Most cell types,particularly fibroblasts and epithelial cells,produce IFN-β,whereas hematopoietic cells,notably plasmacytoid dendritic cells,are the predominant sources of IFN-α.IFNs potently stimulate a variety of innate and adaptive immune cells,including macrophages,NK cells and T *** binding of type I IFN to its cognate receptor triggers the activation of the Janus kinase signal transducer and activator of transcription pathway,which results in the transcription of IFNstimulated genes that play key roles in host resistance to viral infections.

关键词： immunity protective mount

A Computational Study of Thrust Vectoring Control Using Dual Throat Nozzle

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 2010年第6期19卷 486-490页

作者： Choon sik Shin Heuy Dong kim Toshiaki Setoguchi Shigeru Matsuo Department of Mechanical Engineering Andong National University Department of Mechanical Engineering Saga University

Dual throat nozzle (DTN) is fast becoming a popular technique for thrust vectoring. The DTN is designed with two throats, an upstream minimum and a downstream minimum at the nozzle exit, with a cavity in between the upstream throat and exit. In the present study, a computational work has been carried out to analyze the performance of a dual throat nozzle at various mass flow rates of secondary flow and nozzle pressure ratios (NPR). Two-dimensional, steady, compressible Navier-Stokes equations were solved using a fully implicit finite volume scheme. The present computational results were validated with available experimental data. Based on the present results, the control effectiveness of thrust-vectoring is discussed in terms of the thrust coefficient and the coefficient of discharge.

关键词： Compressible Flow Dual Throat Nozzle Thrust Vector Control Shock Wave Supersonic Flow

A Study on Energy Saving Rate for Variable Speed Condition of Multistage Centrifugal Pump

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2015年第6期24卷 566-573页

作者： Sang-Ho Suh Rakibuzzaman Kyung-Wuk kim Hyoung-Ho kim In sik Yoon Min-Tae Cho Department of Mechanical Engineering Soongsil University Dooch Co. 295 Sagok-ri Jangan- Myeon Hwaseong-si Gyeonggi-do 445-942 South Korea

Centrifugal pumps are being widely used in many industrial and commercial *** of these pumps are being operated at constant speed but could provide energy savings through adjustable speed *** purpose of this study was to get the energy saving rates of the multistage centrifugal pump with variable speed *** this investigation an experimental set up of variable flow and pressure system was made to get energy saving rates and numerical analyses are applied to validate the pump *** energy saving and therefore the cost saving depends on the specific duty cycle of which the machine *** cycle is the proportion of time during which a component,device and system is *** duty cycle segmented into different flow rates and weighting the average value for each segment by the interval *** system was operated at 50%or less of the pump *** input power of the system was carried out by pump characteristics curve of each operating *** energy consumption was done by the product of specific duty cycle and the input power of the system for constant speed and variable speed drive *** total energy consumed for constant speed drive pump was 75,770 k *** and for variable speed drive pump was 31,700 k *** total energy saving of the system was 44,070 k *** or 58.16%***,this paper suggests a method of implementing an energy saving on variable-flow and pressure system of the multistage centrifugal pump.

关键词： Multistage Centrifugal Pump Performance Analysis Energy saving rate SST Model Duty Cycle