检索结果-南通市图书馆

Thermodynamic model for deoxidation of liquid steel considering strong metal-oxygen interaction in the quasichemical model framework

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2024年第5期31卷 988-1002页

作者： Yong-Min cho Youn-Bae Kang Graduate Institute of Ferrous and Eco Materials Technology Pohang University of Science and TechnologyPohangKyungbuk37673Rep.of Korea N.EX.T Hub POSCO HoldingsPohangKyungbuk37673Rep.of Korea Department of Materials Science and Engineering Pohang University of Science and TechnologyPohangKyungbuk37673Rep.of Korea

Herein,a thermodynamic model aimed at describing deoxidation equilibria in liquid steel was *** model provides explicit forms of the activity coefficient of solutes in liquid steel,eliminating the need for the minimization of internal Gibbs energy preliminarily when solving deoxidation *** elimination of internal Gibbs energy minimization is particularly advantageous during the coupling of deoxidation equilibrium calculations with computationally intensive approaches,such as computational fluid *** model enables efficient calculations through direct embedment of the explicit forms of activity coefficient in the computing *** proposed thermodynamic model was developed using a quasichemical approach with two key approximations:random mixing of metallic elements(Fe and oxidizing metal) and strong nonrandom pairing of metal and oxygen as nearest *** these approximations,the quasichemical approach yielded the activity coefficients of solutes as explicit functions of composition and temperature without requiring the minimization of internal Gibbs energy or the coupling of separate *** model was successfully applied in the calculation of deoxidation equilibria of various elements(Al,B,C,Ca,Ce,Cr,La,Mg,Mn,Nb,Si,Ti,V,and Zr).The limitations of the model arising from these assumptions were also discussed.

关键词： deoxidation equilibria thermodynamics quasichemical approach computational fluid dynamics

Engineering and Optimization of Silicon–Iron–Manganese Nanoalloy Electrode for Enhanced Lithium-Ion Battery

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2017年第4期9卷 41-48页

作者： Pankaj K.Alaboina Jong-Soo cho Sung-Jin cho Joint School of Nanoscience and Nanoengineering North Carolina Agricultural and Technical State UniversityGreensboroNC 27401USA

The electrochemical performance of a battery is considered to be primarily dependent on the electrode material. However, engineering and optimization of electrodes also play a crucial role, and the same electrode material can be designed to offer significantly improved batteries. In this work, Si–Fe–Mn nanomaterial alloy(Si/alloy) and graphite composite electrodes were densified at different calendering conditions of 3, 5, and 8 tons, and its influence on electrode porosity, electrolyte wettability, and long-term cycling was investigated. The active material loading was maintained very high(~2 mg cm^(-2)) to implement electrode engineering close to commercial loading scales. The densification was optimized to balance between the electrode thickness and wettability to enable the best electrochemical properties of the Si/alloy *** this case, engineering and optimizing the Si/alloy composite electrodes to 3 ton calendering(electrode densification from 0.39 to 0.48 g cm^(-3)) showed enhanced cycling stability with a high capacity retention of ~100% over 100 cycles.

关键词： Electrode engineering Silicon nanoalloy Calendering effect Electrolyte wettability High-density silicon anode

Massless and Massive Particle-in-a-Box States in Single- and Bi-Layer Graphene

在线全文

学校读者我要写书评

暂无评论

Nano Research 2011年第4期4卷 385-392页

作者： Sungjae cho Michael Fuhrer Department of Physics and Center for Nanophysics and Advanced Materials University of Maryland College Park Maryland 20742 USA

Electron transport through short, phase-coherent metal-graphene-metal devices occurs via resonant transmission through particle-in-a-box-like states defined by the atomically-sharp metal leads. We study the spectrum of particle-in-a-box states for single- and bi-layer graphene, corresponding to massless and massive two-dimensional （2-D） fermions. The density of states D as a function of particle number n shows the expected relationships D（n） -n1/2 for massless 2-D fermions （electrons in single-layer graphene） and D（n） -constant for massive 2-D fermions （electrons in bi-layer graphene）. The single parameters of the massless and massive dispersion relations are found, namely Fermi velocity vF = 1.1 × 10^6 m/s and effective mass m＊ = 0.032 me, where me, is the electron mass, in excellent agreement with theoretical expectations.

关键词： Fabry-Perot interference ballistic density of states phase-coherent

Ampullary neuroendocrine tumor diagnosed by endoscopic papillectomy in previously confirmed ampullary adenoma

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 2016年第13期22卷 3687-3692页

作者： Seoung Ho Lee Tae hoon Lee Si-Hyong Jang Chi Young choi Won Myung Lee Ji Hey Min Hyun Deuk cho Sang-Heum Park Division of Gastroenterology Department of Internal Medicine Soonchunhyang University College of Medicine Cheonan Hospital Department of Pathology Soonchunhyang University College of Medicine Cheonan Hospital

Ampullary adenoma is a common indication for endoscopic papillectomy. Ampullary neuroendocrine tumor(NET) is a rare disease for which complete surgical resection is the treatment of choice. However, because of the morbidity and mortality associated with surgical resection, endoscopic papillectomy is increasingly used in selected cases of low grade, with no metastasis and no invasion of the pancreatic or bile duct. Also, confirmed and complete endoscopic resection of ampullary NET accompanied by adenoma has not been reported to date. We report herein a rare case of an ampullary NET accompanied with adenoma, which was successfully and completely resected via endoscopic papillectomy. Prior to papillectomy, this case was diagnosed as an ampullary adenoma.

关键词： Ampulla of Vater Neuroendocrine tumor Adenoma Papillectomy

Convergence of Stereo Vision-Based Multimodal YOLOs for FasterDetection of Potholes

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2022年第11期73卷 2821-2834页

作者： Sungan Yoon Jeongho cho Department of Electrical Engineering Soonchunhyang UniversityAsan31538Korea

Road potholes can cause serious social issues,such as unexpected damages to vehicles and traffic *** efficient road management,technologies that quickly find potholes are required,and thus researches on such technologies have been conducted *** three-dimensional(3D)reconstruction method has relatively high accuracy and can be used in practice but it has limited application owing to its long data processing time and high sensor maintenance *** two-dimensional(2D)vision method has the advantage of inexpensive and easy application of ***,although the 2D vision method using the convolutional neural network(CNN)has shown improved pothole detection performance and adaptability,large amount of data is required to sufficiently train the ***,we propose a method to improve the learning performance of CNN-based object detection model by artificially generating synthetic data similar to a pothole and enhancing the learning ***,to make the defective areas appear more contrasting,the transformed disparity map(TDM)was calculated using stereo-vision cameras,and the detection performance of the model was further improved through the late fusion with RGB(Red,Green,Blue)***,through the convergence of multimodal You Only Look Once(YOLO)frameworks trained by RGB images and TDMs respectively,the detection performance was enhanced by 10.7%compared with that when using only ***,the superiority of the proposed method was confirmed by showing that the data processing speed was two times faster than the existing 3D reconstruction method.

关键词： CNN YOLO disparity map stereo vision pothole

Anti-quorum sensing and anti-biofilm formation activities of plant extracts from South Korea

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Biomedicine 2018年第8期8卷 411-417页

作者： Okhee choi Dong-Wan Kang Su Kyung cho Yeyeong Lee Byeongsam Kang Juyoung Bae Seunghoe Kim Jeong hoon Lee Seung Eun Lee Jinwoo Kim Institute of Agriculture & Life Science Gyeongsang National University Gyeonsangnam-do Agriculture Extension Services Department of Plant Medicine Gyeongsang National University Division of Applied Life Science Gyeongsang National University National Institute of Horticultural and Herbal Science Rural Development Administration

Objective: To investigate anti-quorum sensing(anti-QS) and anti-biofilm formation(antiBF) activities of the ethanol extracts of 388 plants. Methods: The anti-QS activity of the plant extracts was evaluated by disc-diffusion assays using the bio-reporter strain, Chromobacterium violaceum CV017. Pseudomonas aeruginosa PAO1, Yersinia enterocolitica ATCC 9610, and Agrobacterium tumefaciens C58, which possess QS systems, were used to evaluate the antiBF activity of the plant extracts. Results: Among 388 plant extracts, the Cornus controversa(C. controversa) and Cynanchum wilfordii extracts exhibited the strongest anti-QS activity. The C. controversa extract exhibited anti-BF activity against Pseudomonas aeruginosa, Yersinia enterocolitica and Agrobacterium tumefaciens, whereas the Cynanchum wilfordii extract exhibited no anti-BF activity against Pseudomonas aeruginosa. In addition, the C. controversa extract suppressed soft rot of cabbage. Conclusions: The C. controversa extract inhibits bacterial QS and BF, and is capable of controlling soft rot. Therefore, this extract has potential for the prevention and treatment of bacterial infections and for the development of alternatives to antibiotics.

关键词： Plant extracts Quorum sensing Biofilm formation Cornus controversa

CYP3A5 unexpectedly regulates glucose metabolism through the AKT-TXNIP-GLUT1 axis in pancreatic cancer

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Genes & Diseases 2024年第4期11卷 381-399页

作者： Ming Shao Qingfei Pan Haiyan Tan Jing Wu Ha Won Lee Andrew D.Huber William C.Wright Ji-hoon cho Jiyang Yu Junmin Peng Taosheng Chen Department of Chemical Biology and Therapeutics St.Jude Children's Research HospitalMemphisTN 38105USA Department of Computational Biology St.Jude Children's Research HospitalMemphisTN 38105USA Center for Proteomics and Metabolomics St.Jude Children's Research HospitalMemphisTN 38105USA Department of Structural Biology St.Jude Children's Research HospitalMemphisTN 38105USA Department of Developmental Neurobiology St.Jude Children's Research HospitalMemphisTN 38105USA

CYP3A5 is a cytochrome P450(CYP)enzyme that metabolizes drugs and contributes to drug resistance in ***,it remains unclear whether CYP3A5 directly influences cancer *** this report,we demonstrate that CYP3A5 regulates glucose metabolism in pancreatic ductal ***-omics analysis showed that CYP3A5 knockdown re-sults in a decrease in various glucose-related metabolites through its effect on glucose trans-port.A mechanistic study revealed that CYP3A5 enriches the glucose transporter GLUT1 at the plasma membrane by restricting the translation of TXNIP,a negative regulator of ***,CYP3A5-generated reactive oxygen species were proved to be responsible for atten-uating the AKT-4EBP1-TXNIP signaling ***3A5 contributes to cell migration by maintaining high glucose uptake in pancreatic *** together,our results,for the first time,reveal a role of CYP3A5 in glucose metabolism in pancreatic ductal adenocarcinoma and identify a novel mechanism that is a potential therapeutic target.

关键词： Cell migration CYP3A5 Glucose metabolism GLUT1 Pancreatic cancer TXNIP

Investigation on the magnetomechanical behavior of trilayered GM actuator

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 Rare Earths 2008年第2期26卷 264-267页

作者： Heung-Shik Lee chongdu cho Department of Mechanical Engineering Inha University Yonghyun-dong Nam-ku Incheon 402-751 South Korea

In this article, it was suggested a TbFe/Co/Dy trilayered GM （Giant Magnetostrictive） film type actuator and investigated the magnetomechanical characteristics of the actuator for micro application. The trilayered films were fabricated at different thickness ratios to get an optimized structure. TbFe had positive GM properties, and cobalt, dysprosium layers made the magnetostriction property of composite film increase in low magnetic field. To fabricate the Si based microactuator with trilayered film, micromachining processes including RIE （Reactive Ion Etching） and selective DC magnetron sputtering techniques were combined. The deposited film thicknesses were measured by X-ray diffraction （XRD）. As a result, the magnetization of the film on the fabricated actuator was observed to characterize the magnetic properties of the TbFe/Co/Dy film using VSM （Vibrating Sample Magnetometer）. The magnetostriction of the actuator was determined by measuring the differences of curvature of the film coated silicon substrates using the optical cantilever method, and the deflections were also estimated under the external magnetic field lower than 0.5T for micro-system applications.

关键词： GM actuator magnetostriction trilayered film magnetron sputtering magnetization rare earths

Ungraded Matrix Factorizations as Mirrors of Non-orientable Lagrangians

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2024年第1期40卷 26-42页

作者： Lino AMORIM Cheol-Hyun cho Department of Mathematics Kansas State University138 Cardwell Hall1228 N.17th StreetManhattanKS 66506USA Department of Mathematical Sciences Research Institute of MathematicsSeoul National UniversitySan 56-1ShinrimdongGwanakguSeoul 47907South Korea

We introduce the notion of ungraded matrix factorization as a mirror of non-orientable Lagrangian *** ungraded matrix factorization of a polynomial W,with coefficients in a field of characteristic 2,is a square matrix Q of polynomial entries satisfying Q^(2)=W·*** then show that non-orientable Lagrangians correspond to ungraded matrix factorizations under the localized mirror functor and illustrate this construction in a few *** main example is the Lagrangian submanifold RP^(2)⊂CP^(2)and its mirror ungraded matrix factorization,which we construct and *** particular,we prove a version of Homological Mirror Symmetry in this setting.

关键词： Mirror symmetry non-orientable Lagrangian submanifold matrix factorization

同方期刊数据库