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

Survival improvement and prognostic factors in recent management of extrahepatic cholangiocarcinoma:A single-center study

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Hepatobiliary & Pancreatic Diseases International 2020年第2期19卷 153-156页

作者： Jung wan Choe Hyo Jung kim Jae Seon kim Division of Gastroenterology Department of Internal MedicineKorea University Ansan HospitalKorea University College of Medicine516 Gojan-dongDanwon-guAnsan-siGyeonggi-do15355Korea Division of Gastroenterology Department of Internal MedicineKorea University Guro HospitalKorea University College of Medicine148 Gurodong-roGuro-guSeoul 08308Korea

Background:Cholangiocarcinoma was considered as a dismal disease with very poor prognosis until *** is increasingly found due to increased life *** surgical and medical management were advanced recently,data on the prognosis,especially extrahepatic cholangio-carcinoma(ECC),were *** study aimed to identify clinicopathologic features and prognosis of patients with ***:Patients followed up and diagnosed with ECC between January 2014 and December 2016 at a tertiary hospital were included,whereas those with intrahepatic cholangiocarcinoma,gallbladder cancer,and ampullary cancer were ***:A total of 83 patients were followed after the treatment(49 men and 34 women;median age 73.3 years).Cancer location was classified as distal common bile duct(25 patients),proximal com-mon bile duct(24 patients),common hepatic duct(20 patients),and hilar(14 patients).About 14.5%of patients had history of another malignant neoplasm,and 24.1%patients had chronic ***-cal resection was performed in 54 patients(65%)and dysplasia was combined in 63%(34/54).Adjuvant chemotherapy was performed in 54%(29/54),but only 7 underwent palliative chemotherapy in 29 non-surgical *** median overall survival in all patients was 30.9 *** analyzing the treatment modality,median survival of adjuvant chemotherapy,surgery only,palliative chemotherapy,and support-ive care groups were 42.9,30.9,12.0,and 8.9 months,respectively(P<0.05).In the Cox regression analy-sis of survival,age,surgical resection,chemotherapy,and comorbidity were significant prognostic factors,and the comorbidity was the only significant prognostic factor in the multivariable analysis(hazard ratio[HR]=2.80;95%CI:1.32–5.95;P=0.007).In a subgroup analysis of surgical patients,the presence of dysplasia was a favorable prognostic factor in the multivariable analysis(HR=0.29;95%CI:0.09–0.91;P=0.033).Conclusions:The overall survival of patients with ECC wa

关键词： Cholangiocarcinoma Survival Prognosis

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

在线全文

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

Analytical evaluation and experimental validation on dynamic rocking behavior for shallow foundation considering structural response

在线全文

学校读者我要写书评

暂无评论

Earthquake Engineering and Engineering Vibration 2022年第1期21卷 37-51页

作者： Kil-wan Ko Jeong-Gon Ha Dong-Soo kim Department of Civil and Environmental Engineering UC BerkeleyCalifornia 94720USA Advanced Structures and Seismic Safety Research Division Daejeon 34057Korea Department of Civil and Environmental Engineering KAISTDaejeon 34141Korea

The challenge in the practical application of rocking foundations is the estimation of its performance,particularly the rotation angle,during a strong *** this study,the dynamic rocking behavior for a shallow foundation considering structural response was evaluated through two analytical approaches:the conventional soil-foundation-structure interaction(SFSI)governing equation of a single-degree-of-freedom(SDOF)structure on a rocking shallow foundation,and the Housner rocking model(i.e.,a rocking rigid block on a rigid base).Both approaches were validated with dynamic centrifuge *** test models consisted of a soft soil deposit,a shallow rectangular foundation,and an SDOF structure dominated by a bending behavior.A total of 11 foundation-structure systems and six seismic waves,including recorded earthquake signals and sinusoidal waves,were *** results showed that the conventional SFSI equation well predicted the maximum rotation during strong ***,this method was less accurate regarding the rotational phase information and maximum rotation of the foundation during weak *** the other hand,although the modified Housner′s rocking model required five parameters relevant to a soil-foundation-structure system,it overestimated the maximum rotation of the foundation when compared with the results from dynamic centrifuge tests.

关键词： soil-foundation-structure interaction maximum rotation angle rocking foundation Housner rocking model dynamic centrifuge test

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

Design,Fabrication,and Analysis of Flapping and Folding Wing Mechanism for a Robotic Bird

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 Bionic Engineering 2020年第2期17卷 229-240页

作者： Seung wan Ryu Jong Gu Lee Hyoun Jin kim Department of Mechanical&Aerospace Engineering and Automation Systems Research Institute Seoul National UniversitySeoul 08826Republic of Korea

Emulating periodic main wing movement of a bird for generating lift and thrust remains a significant challenge in developing a robotic *** sequences of main wing motion are comprised of flapping,folding,bending,and *** this paper,we concentrate on the flapping and folding motion,and design two wing mechanisms based on a 4-bar linkage structure:one is only for Flapping Motion(FM)and the other is for simultaneous Flapping and Folding Motion(FFM)during a wing *** derive relationships between length and angle of links to analyze kinematic characteristics of the mechanisms and conduct an optimization to select the length parameters of links that allow maximization of the flapping *** run a simulation to confirm the performance of the optimized parameters by examining physical properties,and fabricate two wing mechanisms *** particular,the folding motion is achieved without using an additional *** measurements to investigate a lift profile of each mechanism and their quantitative comparison of the performance of both types confirm the benefits of the folding motion in the perspectives of wing frequency and *** expect that our kinematic formulation,design procedures,and comparative measurement results can help develop a wing mechanism to create a truly biomimetic robotic bird.

关键词： biomimetic robotic bird flapping and folding wing mechanism wing kinematics force measurement

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

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 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

Primary rectal mucosa-associated lymphoid tissue lymphoma treated with only endoscopic submucosal dissection:A case report

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 Clinical Cases 2023年第14期11卷 3362-3368页

作者： wan-sik Lee Myung-Giun Noh Young-Eun Joo Department of Internal Medicine Chonnam National University Medical SchoolHwasun-eup 58128South Korea Department of Pathology Chonnam National University Medical SchoolHwasun-eup 58128South Korea

BACKGROUND Mucosa-associated lymphoid tissue(MALT)lymphoma is a distinct subtype of non-Hodgkin B cell lymphoma that mostly involves the gastrointestinal *** stomach is the most commonly affected site whereas colorectal involvement occurs very *** its rarity,the management and clinical outcome of colorectal MALT lymphoma are not well established *** SUMMARY From the superficial capillary bed in the lower *** ultrasonography showed homogenous hypoechoic lesions in the deep mucosal *** submucosal dissection(ESD)was done for accurate histologic diagnosis and treatment and both the rectal lesions were completely removed en bloc and subsequently diagnosed as primary rectal MALT ***,we report a case of primary rectal MALT lymphoma in a 68-year-old woman that was treated by only ESD,and the 12-month follow-up revealed no tumour *** These results of our case and previous reports suggest that endoscopic resection alone may be a feasible and safe treatment for primary colorectal MALT lymphoma and allows organ preservation.

关键词： Rectum Mucosa-associated lymphoid tissue lymphoma Endoscopic submucosal dissection

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