检索结果-南通市图书馆

Correlation between hydration properties and electrochemical performances on Ln cation size effect in layered perovskite for protonic ceramic fuel cells

引用

Journal of Energy Chemistry 2024年第1期88卷 1-9,I0001页

作者： Inhyeok Cho Jiwon Yun Boseok Seong Junseok Kim sun Hee Choi ho-Il Ji Sihyuk Choi Department of Mechanical Engineering Kumoh National Institute of TechnologyGumi 39177GyeongbukRepublic of Korea Department of Aeronautics Mechanical and Electronic Convergence EngineeringKumoh National Institute of TechnologyGumi 39177GyeongbukRepublic of Korea Center for Energy Materials Research Korea Institute of Science and Technology(KIST)Seoul 02792Republic of Korea Center for Hydrogen and Fuel Cell Research Clean Technology Research DivisionKorea Institute of Science and Technology(KIST)Seoul 02792Republic of Korea Department of Energy and Environmental Engineering University of Science and TechnologySeoul 02792Republic of Korea Nanomaterials Science and Engineering Korea University of Science and Technology(UST)KIST CampusSeoul 02792Republic of Korea

PrBa_(0.5)Sr_(0.5)Co_(1.5)Fe_(0.5)O_(5+δ)(PrBSCF) has attracted much research interest as a potential triple ionic and electronic conductor(TIEC) electrode for protonic ceramic fuel cells(PCFCs). The chemical formula for Pr BSCF is AA'B_(2)O_(5+δ), with Pr(A-site) and Ba/Sr(A'-site) alternately stacked along the c-axis. Due to these structural features, the bulk oxygen ion diffusivity is significantly enhanced through the disorder-free channels in the PrO layer;thus, the A site cations(lanthanide ions) play a pivotal role in determining the overall electrochemical properties of layered perovskites. Consequently, previous research has predominantly focused on the electrical properties and oxygen bulk/surface kinetics of Ln cation effects,whereas the hydration properties for PCFC systems remain unidentified. Here, we thoroughly examined the proton uptake behavior and thermodynamic parameters for the hydration reaction to conclusively determine the changes in the electrochemical performances depending on LnBa_(0.5)Sr_(0.5)Co_(1.5)Fe_(0.5)O_(5+δ)(LnBSCF,Ln=Pr, Nd, and Gd) cathodes. At 500 ℃, the quantitative proton concentration of PrBSCF was 2.04 mol% and progressively decreased as the Ln cation size decreased. Similarly, the Gibbs free energy indicated that less energy was required for the formation of protonic defects in the order of Pr BSCF hodes, PCFC single cell measurements and analysis of the distribution of relaxation time were further investigated.

关键词： Protonic ceramic fuel cell Cathode Triple ionic and electronic conductor Hydration property Proton uptake Gibbs free energy

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Copper(I)-Catalyzed Interrupted Click/Sulfenylation Cascade:One-Pot Synthesis of Sulfur Cycle Fused 1,2,3-Triazoles

引用

Chinese Journal of Chemistry 2020年第5期38卷 445-448页

作者： Weiguo Wang Shuai Huang Shikun Yan Xuejun sun Chen-ho Tung Zhenghu Xu School of Chemistry and Chemical Engineering Qufu Normal UniversityQufuShandong 273165China Key Lab for Colloid and Interface Chemistry of Education Ministry Shandong UniversityJinanShandong 250100China State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic ChemistryChinese Academy of SciencesShanghai 200032China

Herein,we report a practical protocol for the synthesis of sulfur cycle fused 1,2,3-triazoles through a copper(I)-catalyzed tandem click/intramolecular sulfenylation *** reaction proceeded via a copper-catalyzed alkyne azide cycloaddition,followed by interception of the in situ formed cuprate-triazole intermediate with *** reaction shows broad substrate scope,complete regioselectivity,and excellent functional group tolerance under mild reaction conditions.

关键词： reaction. catalyzed copper

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Au-catalyzed neighboring hydroxymethyl group directed cycloaddition of alkyne with diazadienes:Synthesis of polysubstituted pyrroles

引用

Chinese Chemical Letters 2023年第1期34卷 342-346页

作者： Zhenwei Shi Wenxiu Mao Zhenning Yang Shuzhe sun Chen-ho Tung Zhenghu Xu School of Chemistry and Chemical Engineering Shandong UniversityJi’nan 250100China Key Laboratory of Precise Synthesis of Functional Molecules of Zhejiang Province School of ScienceWestlake UniversityHangzhou 310024China

Polysubstituted pyrroles are very important scaffolds in many bioactive natural products and synthetic ***,a new gold-catalyzed cycloaddition of alkynes with azadienes to access tetrasubstituted pyrroles is *** neighboring hydroxylmethyl group serves a very important directing group through an addition/cycloaddition/elimination *** polysubstituted pyrroles were synthesized in good yields under mild conditions in one step,and tricyclic pyrrole containing heterocycles were easily obtained through derivatization.

关键词： Pyrrole Au Neighboring group Cascade reaction Synthetic method

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Oxidation of a Co-base Superalloy

引用

Journal of Materials Science & Technology 2008年第6期24卷 883-890页

作者： Guichen ho U Zhiyuan LIU Hua WEI Qi ZHENG Xiaofeng sun Hengrong G UAN Zhuangqi HU Superalloy Division Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China China Aviation Powerplant Research Institute Zhuzhou 412002 China

The oxidation behavior of a cast polycrystalline Co-base superalloy was studied at temperatures from 900 to 1050℃ and analyzed by thermogravimetric analysis （TGA）, X-ray diffraction （XRD） and scanning electron microscopy （SEM）. The results indicate that a cast Co-base superalloy follows the subparabolic oxidation kinetics at 900 and 1000℃, which are controlled by the growth of the inner Cr-rich layer, and that after oxidation at 1050℃ for 200 h, it almost exhibits the linear oxidation kinetics possible due to the volatility of Cr-rich oxide. A mixed scale forms on the alloy after prolonged oxidation. The oxide scale formed at 900 and 1000℃ is composed of an outer layer of spinel and an inner continuous Cr-rich layer and at I050℃ is composed of a very discontinuous Cr-rich layer.

关键词： Co-base superalloy Oxidation Kinetics Microstructure

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Comparison Between Full-Scale and Model Experiments of Oil Fences

引用

China Ocean Engineering 2009年第4期23卷 657-668页

作者： Tae ho KIM Duck Jong JANG Kyong Uk YANG sun Chol NA Dae An KIM School of Marine Technology Chonnam National UniversityYeosu Department of Maritime Police Science Chonnam National UniversityYeosu Korea Marine Environment Management Corporation

This study examines the performance of an air expansion oil fence system as deployed in two different configurations. Geometric and tension characteristics of the oil fence are investigated for （1） the system attached to two vessels and （2） the system attached to one vessel with spreading devices. Since full-scale testing can be time consuming and expensive, another component of the study was to examine how well models would perform. A scaling technique was developed and a set of experiments were conducted with a 1/20-th scale model of the oil fence in a towing tank facility. Performance resalts from the model tests were compared with those conducted at sea. The tension （N） in the full-scale results were represented by R = avb, where v is the current velocity in m/s and the values for a and b used for comparison purposes. Both sets of full-scale and model tests were conducted with an oil fence opening of 120 m and 160m. In the full-scale experiment with spreading devices attaahed to the forward ends of the oil fence, the horizontal distance of the spreading devices has a tendency to linearly increase as the current velocity increases when the warp length is as short as 50 m, but to linearly decrease as the current velocity increases when the warp length is extended to 100 m and 150 m. The spreading distance at uniform current velocitys in the model test increases as the warp length is extended. While there is no significant difference of spreading distance between the cases of 100 m and 150 m, the spreading distance becomes shorter when the warp length is 50 m.

关键词： oil fence spreading devices tension horizontal distance

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Efficient TE-Selective P-I-i-I-N GaAs/Al_( 0.35)Ga_(0.65)As Waveguide Phase Modulator at λ=1.55μm

引用

光学学报 2003年第S1期23卷 341-342页

作者： sun-Pil Kim Sang-sun Lee Seok Lee Deok-Ha Woo sun-ho Kim Photonics Research Laboratory Division of Electrical and Computer Engineering Hanyang University 17 Hangdang-Dong Seongdong-Ku Seoul 133-791 Korea Photonics Research Center KIST P.O.Box 131 Cheongryang Seoul 130-650 Korea

We fabricated a phase modulator with significant phase shift for TE mode but negligible for TM mode. The measured phase shift efficiency was 7.9°/*** for TE mode. No modulation was observed for TM mode.

关键词： phase shift

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Robust superhydrophobicity of hierarchical ZnO hollow microspheres fabricated by two-step self-assembly

引用

Nano Research 2013年第10期6卷 726-735页

作者： Ziqi sun Ting Liao Kesong Liu Lei Jiang Jung ho Kim Shi Xue Dou Institute for Superconducting and Electronic Materials University of Wollongong Innovation Campus North Wollongong NSW 2500 Australia Australian Institute for Bioengineering and Nanotechnology the University of Queensland St Lucia QLD 4072 Australia Key Laboratory of Bio-inspired Smart Interracial Science and Technology of Ministry of Education School of Chemistry and Environment Beijing University of Aeronautics &Astronautics Beijing 100191 China Beijing National Laboratory for Molecular Sciences Key Laboratory of Organic Solids Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China

Superhydrophobic and superhydrophilic surfaces have been extensively inves- tigated due to their importance for industrial applications. It has been reported, however, that superhydrophobic surfaces are very sensitive to heat, ultraviolet （UV） light, and electric potential, which interfere with their long-term durability. In this study, we introduce a novel approach to achieve robust superhydrophobic thin films by designing architecture-defined complex nanostructures. A family of ZnO hollow microspheres with controlled constituent architectures in the morphologies of 1D nanowire networks, 2D nanosheet stacks, and 3D mesoporous nanoball blocks, respectively, was synthesized via a two-step self-assembly approach, where the oligomers or the constituent nanostructures with specially designed structures are first formed from surfactant templates, and then further assembled into complex morphologies by the addition of a second co-surfactant. The thin films composed of two-step synthesized ZnO hollow microspheres with different architectures presented superhydrophobicities with contact angles of 150°-155°, superior to the contact angle of 103° for one-step synthesized ZnO hollow microspheres with smooth and solid surfaces. Moreover, the robust superhydrophobicity was further improved by perfluorinated silane surface modification. The perfluorinated silane treated ZnO hollow microsphere thin films maintained excellent hydrophobicity even after 75 h of UV irradiation. The realization of environmentally durable promising solution for their long-term irradiations. superhydrophobic surfaces provides a service under UV or strong solar light

关键词： ZnO hierarchical structure two-step self-assembly nanomaterials robustsuperhydrophobicity

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

A proximity-induced covalent fluorescent probe for selective detection of bromodomain 4

引用

Chinese Chemical Letters 2018年第7期29卷 1147-1150页

作者： Ling Feng Mohit Chhabra Wing ho So Qing Zhu Jiang Xia hongyan sun Department of Chemistry and Center of Super-Diamond and Advanced Films (COSDAF) City University of Hong Kong Key Laboratory of Biochip Technology Biotech and Health Centre Shenzhen Research Institute of City University of Hong Kong Department of Chemistry The Chinese University of Hong Kong College of Biotechnology and bioengineering Zhejiang University of Technology

Lysine acetylation is one of the most prevalent and important posttranslational modifications(PTMs) in proteins. The process can be recognized by bromodomains(BRDs), which are a class of proteininteraction modules involved in chromatin remodeling and transcriptional activation. The development of BRD fluorescent probes will be useful for monitoring the activity of BRDs in living cells as well as aiding inhibitor development. Herein we designed a peptide-based probe based on the proximity-induced protein conjugation reaction. The peptide-based probe is capable of covalently and selectively reacting with the unique cysteine residue in the bromodomain through proximity effect. Our experimental data showed that the probe displayed noticeable fluorescence response upon addition of BRD4(1). In-gel fluorescence scanning demonstrated that BRD4(1) can be covalently labelled by the probe. Moreover, the probe was shown to selectively detect BRD4(1) over other proteins. We envision that the probe developed in this study will provide a useful tool to further investigate the biological roles of BRDs.

关键词： Peptide-based probe Bromodomain Fluorescent probe Proximity effect Peptides

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Immunosuppressant treatment for IgG4-related sclerosing cholangitis: A case report

引用

World Journal of Clinical Cases 2021年第1期9卷 267-273页

作者： Jong-sun Kim Won ho Choi Kyung-Ann Lee Hyun-Sook Kim Department of Internal Medicine Soonchunhyang University Seoul HospitalSeoul 04401South Korea

BACKGROUND Immunoglobulin G4-related disease(IgG4-RD)is a multi-system fibroinflammatory disorder that can involve any organ,including the salivary glands,pancreas,and biliary *** of immunoglobulin G4-related sclerosing cholangitis(IgG4-SC)is similar to that for IgG4-RD,but progression is irreversible in some *** present a case of IgG4-SC in which an immuno-suppressant induced marked clinical and radiologic *** SUMMARY A 63-year-old male presented with a prominent itching sensation and wholebody *** showed obstructive-pattern jaundice,an elevated IgG4 level,and infiltration of a large number of IgG4-positive cells in the ampulla of *** imaging findings of intrahepatic duct(IHD)and common bile duct dilation,an elevated serum IgG4 level,and characteristic histological findings led to diagnosis of IgG4-SC that compatible with the 2019 ACR/EULAR classification *** planned to treat the patient with high-dose glucocorticoid(GC),followed by cyclophosphamide pulse *** treatment with high-dose GC and an immunosuppressant,imaging studies showed that IHD dilatation had completely *** Prompt diagnosis and appropriate treatment of IgG4-SC are *** there is a risk of relapse of IgG4-SC,the GC dose should be gradually reduced,and a maintenance immunosuppressant should be given.

关键词： Immunoglobulin G4-related disease Immunoglobulin G4-related sclerosing cholangitis Glucocorticoid Immunosuppressant Case report ACR/EULAR classification criteria

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Towards high-performance and robust anion exchange membranes(AEMs)for water electrolysis:Super-acid-catalyzed synthesis of AEMs

引用

Journal of Energy Chemistry 2024年第6期93卷 478-510,I0012页

作者： Geun Woong Ryoo sun Hwa Park Ki Chang Kwon Jong Hun Kang ho Won Jang Min Sang Kwon Department of Materials Science and Engineering Research Institute of Advanced Materials(RIAM)Seoul National UniversitySeoul 08826Republic of Korea Interdisciplinary Materials Measurement Institute Korea Research Institute of Standards and Science(KRISS)Daejeon 34113Republic of Korea Department of Chemical and Biological Engineering and Institute of Chemical ProcessSeoul National UniversitySeoul 08826Republic of Korea Department of Applied Measurement Science University of Science and TechnologyDaejeon 34113Republic of Korea

The increasing demand for hydrogen energy to address environmental issues and achieve carbon neutrality has elevated interest in green hydrogen production,which does not rely on fossil *** various hydrogen production technologies,anion exchange membrane water electrolyzer(AEMWE)has emerged as a next-generation technology known for its high hydrogen production efficiency and its ability to use non-metal ***,this technology faces significant challenges,particularly in terms of the membrane durability and low ionic *** address these challenges,research efforts have focused on developing membranes with a new backbone structure and anion exchange groups to enhance durability and ionic ***,the super-acid-catalyzed condensation(SACC)synthesis method stands out due to its user convenience,the ability to create high molecular weight(MW)polymers,and the use of oxygen-tolerant organic *** the synthesis of anion exchange membranes(AEMs)using the SACC method began in 2015,and despite growing interest in this synthesis approach,there remains a scarcity of review papers focusing on AEMs synthesized using the SACC *** review covers the basics of SACC synthesis,presents various polymers synthesized using this method,and summarizes the development of these polymers,particularly their building blocks including aryl,ketone,and anion exchange *** systematically describe the effects of changes in the molecular structure of each polymer component,conducted by various research groups,on the mechanical properties,conductivity,and operational stability of the *** review will provide insights into the development of AEMs with superior performance and operational stability suitable for water electrolysis applications.

关键词： Green hydrogen production Water electrolysis Anion exchange membrane water electrolyzer(AEMWE) Anion exchange membranes(AEMs) Super-acid-catalyzed condensation(SACC)

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：