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Al2O3-TiO2/ZrO2-SiO2 based porous ceramics from particle-stabilized wet foam

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Journal of Advanced Ceramics 2017年第2期6卷 129-138页

作者： Bijay BASNET Naboneeta SARKAR Jung Gyu PARK Sangram MAZUMDER ik jin kim Institute of Processing and Application of Inorganic Materials(PAIM) Hanseo University # 360 Seosan-siChungnam 356-706 Republic of Korea School of Mechanical and Materials Engineering Washington State University Pullman Washington United States

The porous ceramics based on Al2O3-TiO2/ZrO2-SiO2 from particle-stabilized wet foam by direct foaming were *** initial Al2O3-TiO2 suspension was prepared by adding TiO2 suspension to partially hydrophobized colloidal Al2O3 suspension with equimolar amount,to form Al2TiO5 on *** secondary ZrO2-SiO2 suspension was prepared using the equimolar composition,and to obtain ZrSiO4,ZrTiO4,and mullite phases in the sintered samples,the secondary suspension was blended into the initial suspension at 0,10,20,30,and 50 vol％.The wet foam exhibited an air content up to 87％,Laplace pressure from 1.38 to 2.23 mPa,and higher adsorption free energy at the interface of approximately 5.8×108 to 7.5×108J resulting an outstanding foam stability of 87％.The final suspension was foamed,and the wet foam was sintered from 1400 to 1600 ℃ for 1 *** porous ceramics with pore size from 150 to 400 μm on average were *** phase identification was accomplished using X-ray diffraction (XRD),differential thermal analysis (DTA),and thermogravimetric analysis (TGA),and microstructural analysis was performed using field emission scanning electron microscopy (FESEM).

关键词： Al2TiO5 direct foaming Laplace pressure adsorption free energy porous ceramics

Negative Thermal Expansion up to 1000℃ of ZrTiO4-Al2TiO5 Ceramics for High-Temperature Applications

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Negative Thermal Expansion up to 1000℃ of ZrTiO4-Al2TiO5 Ce...

Technical issues and new devices of ESD of early gastric cancer

The 3～〔rd〕International Conference on High-Performance Ceramics(CICC-3)（2）

作者： ik jin kim Hyung Chul kim In Sub Han Christos G.Aneziris Institute for Processing and Application of Inorganic Materials（PAIM） Department of Materials Science and Engineering Hanseo UniversitySeosan city Chungnam Korea Institute for Processing and Application of Inorganic Materials（PAIM） Department of Materials Science and Engineering Hanseo UniversitySeosan city Chungnam Korea Energy Materials Research Team Korea Institute of Energy Research （KIER） Taejeon 305-343 South Korea Institute of Ceramic Glass and Construction MaterialsTechnical University of Freiberg Agricola strasse 17 09599 FreibergGermany

＜正＞ High temperature structural ceramics based on Al2TiO5-ZrTiO4 （ZAT） having excellent thermal-shock-resistance were synthesized by a reaction sintering. The ZAT ceramics sintered at 1600℃had a negative thermal expansions up to 1000℃and a much lower thermal expansion coefficient （0.3 -1.3 ×10-6 /K） than that of polycrystalline Al2TiO5 （1.5 ×10-6 /K）. These low thermal expansion are apparently due to a combination of microcracking caused by the large thermal expansion anisotropy of the crystal axes of the Al2TiO5 phase. The microstructural degradation of the composites after various thermal treatment for high temperature applications were analyzed by scanning electron microscopy, X-ray diffraction, ultrasonic and dilatometer.

关键词： Al2TiO5 ZrTiO4 negative thermal expansion thermal-shock-resistance thermal durability

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World Journal of Gastroenterology 2011年第31期17卷 3585-3590页

作者： Wan Sik Lee jin Woong Cho Young Dae kim Kyu Jong kim Byung ik Jang Division of Gastroenterology Department of Internal MedicineChonnam University Medical School Division of Gastroenterology and Hepatology Department of Internal MedicinePresbyterian Medical Center Division of Gastroenterology and Hepatology Department of Internal MedicineSchool of MedicineChosun University Division of Gastroenterology Department of Internal MedicineKosin University College of Medicine Division of Gastroenterology Department of Internal MedicineYeungnam University College of Medicine

Endoscopic submucosal dissection(ESD) is a highly refined technique compared to conventional endoscopic mucosal *** enables complete resection of early gastric cancer(EGC) which has no possibility of lymph node *** for ESD of EGC generally entails early gastric cancer confined to the mucosa with well differentiated histology,though there are clinically suitable expanded *** ESD requires specific skill and expertise,endoscopists need to be familiarized with basic methods and the use of special *** essence of the technique is to dissect the submucosal layer with direct vision and maintain thecutting plane above the underlying proper muscle *** there are some differences in the detailed technical aspect,the cardinal method of ESD is now well established and ***,research and development of new ESD devices that render more efficient,safe ESD are still in progress to improve the overall result of ESD on early gastric cancer.

关键词： Endoscopic submucosal dissection Technique Device Early gastric cancer

Continuum understanding of twin formation near grain boundaries of FCC metals with low stacking fault energy

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npj Computational Materials 2017年第1期3卷 275-283页

作者： Jaimyun Jung Jae ik Yoon Jung Gi kim Marat I.Latypov jin You kim Hyoung Seop kim Department of Materials Science and Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea GT-CNRS UMI 2958 Georgia TechLorraine 57070 MetzFrance Pohang Research Laboratory Steel Products Research Group 1POSCOPohang 790-785Republic of Korea Center for High Entropy Alloys Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea

Deformation twinning from grain boundaries is often observed in face-centered cubic metals with low stacking fault *** of the possible factors that contribute to twinning origination from grain boundaries is the intergranular interactions during ***,the influence of mechanical interaction among grains on twin evolution has not been fully *** spite of extensive experimental and modeling efforts on correlating microstructural features with their twinning behavior,a clear relation among the large aggregate of grains is still *** this work,we characterize the micromechanics of grain-to-grain interactions that contribute to twin evolution by investigating the mechanical twins near grain boundaries using a full-field crystal plasticity simulation of a twinning-induced plasticity steel deformed in uniaxial tension at room *** are first observed through electron backscatter diffraction technique to obtain data to reconstruct a statistically equivalent microstructure through synthetic microstructure ***-to-grain micromechanical response is analyzed to assess the collective twinning behavior of the microstructural volume element under tensile *** of the simulated results reveal that grain interactions are capable of changing the local mechanical behavior near grain boundaries by transferring strain across grain boundary or localizing strain near grain boundary.

关键词： grain microstructure steel

Electrochemically Deposited CZTSSe Thin Films for Monolithic Perovskite Tandem Solar Cells with Efficiencies Over 17%

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Energy & Environmental Materials 2024年第1期7卷 147-152页

作者： Sun Kyung Hwang ik Jae Park Se Won Seo Jae Hyun Park So Jeong Park jin Young kim Department of Materials Science and Engineering Seoul National UniversitySeoul 08826Korea Department of Applied Physics Sookmyung Women's UniversitySeoul 04310Korea Research Institute of Advanced Materials and Systems Sookmyung Women's UniversitySeoul 04310Korea Research Institute of Advanced Materials(RIAM) Seoul National UniversitySeoul 08826Korea

In spite of the high potential economic feasibility of the tandem solar cells consisting of the halide perovskite and the kesterite Cu2ZnSn(S,Se)4(CZTSSe),they have rarely been demonstrated due to the difficulty in implementing solution-processed perovskite top cell on the rough surface of the bottom ***,we firstly demonstrate an efficient monolithic two-terminal perovskite/CZTSSe tandem solar cell by significantly reducing the surface roughness of the electrochemically deposited CZTSSe bottom *** surface roughness(R_(rms))of the CZTSSe thin film could be reduced from 424 to 86 nm by using the potentiostatic mode rather than using the conventional galvanostatic mode,which can be further reduced to 22 nm after the subsequent ion-milling *** perovskite top cell with a bandgap of 1.65 eV could be prepared using a solution process on the flattened CZTSSe bottom cell,resulting in the efficient perovskite/CZTSSe tandem solar *** the current matching between two subcells involving the thickness control of the perovskite layer,the best performing tandem device exhibited a high conversion efficiency of 17.5%without the hysteresis effect.

关键词： CZTSSe monolithic tandem solar cells perovskite solution process surface roughness control

Profile of Blow-up Solution to Hyperbolic System with Nonlocal Term

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Acta Mathematica Sinica,English Series 2007年第6期23卷 1083-1094页

作者： Zhi Wen DUAN Kwang ik kim Department of Mathematics Huazhong University of Science and Technology Wuhan 430074 P. R. China Department of Mathematics Pohang University of Science and Technology Pohang 790-784 Republic of Korea

This paper is concerned with a nonlocal hyperbolic system as follows utt = △u ＋（∫Ωvdx ）^p for x∈R^N,t〉0 ,utt = △u ＋（∫Ωvdx ）^q for x∈R^N,t〉0 ,u（x,0）=u0（x）,ut（x,0）=u01（x） for x∈R^N,u（x,0）=u0（x）,ut（x,0）=u01（x） for x∈R^N, where 1≤ N ≤3, p ≥1, q ≥ 1 and pq 〉 1. Here the initial values are compactly supported and Ω belong to R^N is a bounded open region. The blow-up curve, blow-up rate and profile of the solution are discussed.

关键词： hyperbolic system nonlocal term blow-up profile

Energy Estimate for the Type-Ⅱ Superconducting Film

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Acta Mathematica Sinica,English Series 2008年第1期24卷 75-86页

作者： Kwang ik kim Zu Han LIU Department of Mathematics Pohang University of Science and Technology Pohang 790-784 Republic of Korea Department of Mathematics Xuzhou Normal University Xuzhou 221116 P. R. China

We study the minimizers of the Ginzburg-Landau model for variable thickness, superconducting, thin films with high k, placed in an applied magnetic field hex, when hex is of the order of the ＂first critical field＂, i.e. of the order of ｜lnε｜. We obtain the asymptotic estimates of minimal energy and describe the possible locations of the vortices.

关键词： superconductivity Ginzburg-Landau functional free boundary problem

CXC chemokines and chemokine receptors in gastric cancer: From basic findings towards therapeutic targeting

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World Journal of Gastroenterology 2014年第7期20卷 1681-1693页

作者： Hyo jin Lee ik-Chan Song Hwan-Jung Yun Deog-Yeon Jo Samyong kim Division of Hematology/Oncology Department of Internal MedicineSchool of Medicine Chungnam National University and Chungnam National University HospitalDaejeon 301-721South Korea Cancer Research Institute Chungnam National UniversityDaejeon 301-721South Korea Division of Hematology/Oncology Department of Internal MedicineChungnam National University HospitalDaejeon 301-721South Korea

Gastric cancer is the fourth most common cancer,and the second-highest cause of cancer-related deaths *** extensive research to identify novel diagnostic and therapeutic agents,patients with advanced gastric cancer suffer from a poor quality of life and poor prognosis,and treatment is dependent mainly on conventional cytotoxic *** improve the quality of life and survival of gastric cancer patients,a better understanding of the underlying molecular pathologies,and their application towards the development of novel targeted therapies,is urgently *** are a group of small proteins associated with cytoskeletal rearrangements,the directional migration of several cell types during development and physiology,and the host immune response via interactions with G-protein coupled *** is also growing evidence to suggest that chemokines not only play a role in the immune system,but are also involved in the development and progression of *** gastric cancer,CXC chemokines and chemokine receptors regulate the trafficking of cells in and out of the tumor *** chemokines and their receptors can also directly influence tumorigenesis by modulating tumor transformation,survival,growth,invasion and metastasis,as well as indirectly by regulating angiogenesis,and tumor-leukocyte *** this review,we will focus on the roles of CXC chemokines and their receptors in the development,progression,and metastasis of gastric tumors,and discuss their therapeutic potential for gastric cancer.

关键词： Chemokine Chemokine receptor Gastric neoplasm Therapeutic target

Involvement of lymphocytes in dextran sulfate sodium-induced experimental colitis

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World Journal of Gastroenterology 2006年第2期12卷 302-305页

作者： Tae Woon kim Jae Nam Seo Young Ho Suh Hyo jin Park Ju Hyun kim Ji Young kim Kwon ik Oh Department of Pathology Hallym University College of MedicineChuncheonKorea Division of Metabolic Diseases Department of Biomedical SciencesNational Institute of HealthSeoulKorea Graduate Program of Immunology and Department of Pathology Seoul National University College of MedicineSeoulKorea

AIM： To investigate the roles of lymphocytes in the development of dextran sulfate sodium-induced colitis. METHODS： Using various doses of dextran sulfate sodium （DSS）, we induced colitis in wild-type B6 control and Rag-1 knockout （H-2b haplotype） mice, and evaluated the colitis in terms of symptomatic and histologic parameters, such as weight loss, survival, severity of diarrhea, shortage of colon length and histological changes. Symptomatic parameters were checked daily and histological changes were scored. RESULTS： Although development of colitis in Rag-1 knockout mice treated with high dose （5%） of DSS was comparable to that in B6 control mice, colitis progression was much more tolerable in Rag-1 knockout mice compared to than in B6 mice treated with low dose （1.5%） DSS. Symptomatic parameters as well as histopathologic changes were improved in Rag-1 knockout mice. CONCLUSION： These results indicate that the presence of lymphoo/tes contributes to colitis progression at low dose of DSS stimulation. Lymphoo/tes may play roles as an aggravating factor in DSS-induced colitis.

关键词： Dextran sulfate sodium Colitis Lymphocyte Rag-1 Knockout