检索结果-南通市图书馆

A semi-analytical multi-harmonic balance method on full-3D contact model for dynamic analysis of dry friction systems

引用

Chinese Journal of Aeronautics 2024年第2期37卷 309-329页

作者： He sun Dayi ZHANG yaguang WU Qingyang SHEN Dianyin HU Research Institute of Aero-Engine Beihang UniversityBeijing 100191China School of Energy and Power Engineering Beihang UniversityBeijing 100191China Beijing Key Laboratory of Aero-Engine Structure and Strength Beijing 100191China Sino-French Engineering School Beihang UniversityBeijing 100191China AECC Sichuan Gas Turbine Research Establishment Chengdu 610500China

Dry friction damping structures are widely-used in aero-engines to mitigate vibration.The nonlinear nature of friction and the two-dimensional in-plane motion on the contact interface bring challenges to accurately and efficiently predict the forced response of frictionally damped structures.The state-of-the-art Multi-Harmonic Balance Method(MHBM)on quasi-3D contact model in engineering cannot precisely capture the kinematics on the friction interface although the efficiency is high.The full-3D contact model can describe the constitutive relationship of the interface in a more accurate manner;however,the efficiency and convergence are not guaranteed for large-scale models.In this paper,a semi-analytical MHBM on full-3D contact model is proposed.The original Trajectory Tracking Method(TTM)for evaluating the contact force is reformulated to make the calculation more concise and the derivation of the Analytical Jacobian Matrix(AJM)feasible.Based on the chain rule of derivation,the AJM which is the core to upgrade the performance is deduced.Through a shrouded blade finite element model,the accuracy and efficiency of the proposed method are compared with both the MHBM on full-3D contact model with numerical Jacobian matrix and the MHBM on quasi-3D contact model with AJM.The results show that the AJM improves significantly the efficiency of the MHBM on full-3D contact model.The time cost of the proposed method is in the same order of magnitude as that of the MHBM on quasi-3D contact model.We also confirm that the full-3D contact model is necessary for the dynamic analyses of shrouded blades.If one uses the quasi-3D model,the estimation relative error of damping can even reach 31.8%in some cases.In addition,the AJM also brings benefits for stability analysis.It is highly recommended that engineers use the MHBM on full-3D contact model for the dynamic analysis and design of shrouded blades.

关键词： Dry friction damping Multi-harmonic balance method Trajectory tracking method Jacobian matrix Shrouded blade

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

Carbon materials in electrocatalytic oxidation systems for the treatment of organic pollutants in wastewater:A review

引用

Carbon Resources Conversion 2023年第4期6卷 262-273页

作者： Xintong Duan Dezhang Ren Shichun Wang Mengjie Zhang yaguang sun Shujing sun Zhibao Huo Nahui Zhang College of Marine Ecology and Environment Shanghai Ocean University999 Huchenghuan RoadShanghai 201306China The Key Laboratory of Inorganic Molecule-Based Chemistry of Liaoning Province Shenyang University of Chemical TechnologyShenyang 110142China Liaoning Ecological Environmental Monitoring Center Shenyang 110165China

Carbon materials are widely used as catalysts in electrocatalytic oxidative(EO)degradation of wastewater due to their large specific surface area and low cost.Carbon materials can also be used as catalyst carriers for EO reactions due to their ease of functionalization with other heteroatoms and metals/metal oxides.To improve the catalytic activity and current efficiency of carbon materials,modifying the structural and physicochemical properties of conventional carbon materials are common improvement method.This review briefly outlines the recent research progress of carbon materials in EO for organic pollutants degradation.It also discusses the modification strategies and corresponding electrocatalytic properties of various carbon materials(carbon nanomaterials and porous carbon materials),and explores the EO mechanism.Finally,some summaries of the remaining challenges and future developments of carbon materials in the field of electrocatalysis are given.

关键词： Carbon materials Electrocatalytic oxidation Industrial wastewater Mechanism

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 review of anodic catalysts and their application in(non-)Kolbe electrocatalytic decarboxylation of carboxylic acids

引用

Carbon Resources Conversion 2023年第4期6卷 287-297页

作者： Shichun Wang Dezhang Ren Yueying Du Mengjie Zhang Nahui Zhang yaguang sun Zhibao Huo College of Marine Ecology and Environment Shanghai Ocean University999 Huchenghuan RoadShanghai 201306China The Key Laboratory of Inorganic Molecule-Based Chemistry of Liaoning Province Shenyang University of Chemical TechnologyShenyang110142China Shanghai Engineering Research Center of River and Lake Biochain Construction and Resource Utilization Shanghai201702China

Biomass,as the exclusive and abundant organic resources,is considered to be the promising renewable resource.Carboxylic acids are one of the many compounds that can be obtained from raw biomass.Decarboxylation of carboxylic acids into fuels and chemicals via electrochemical method at mild reaction condition has been studied for many years.The(non-)Kolbe reaction,one of the oldest organic electrochemical reactions,is the decarboxylation of carboxylic acids to produce alkanes,alcohols,esters,etc.And electrode materials influence the production of electrocatalytic decarboxylation products from carboxylic acids.Therefore,this work mainly reviews the recent advances in applications of anodic materials for(non-)Kolbe electrocatalytic decarboxylation of carboxylic acids.It discusses the reaction mechanism of(non-)Kolbe electrolytic reaction,and the electrocatalytic oxidation of carboxylic acid using different electrodes and electrolytic systems to synthesize fuels and chemicals.Also,various types of electrode catalysts,such as Pt-based catalysts,C-based catalysts,and other catalysts,are introduced in detail.Finally,the challenges and future trends of the(non-)Kolbe reaction of carboxylic acids are presented.This review found that platinum-based electrocatalysts proved to be the most promising catalysts at present.And in recent years,a variety of synthesis methods have been developed to synthesize small size and high-performance noble metal based amorphous catalysts.Another approach is to study catalysts without platinum electricity,such as Ru,Ir,Ti and carbon materials.The review is helpful in understanding and know the anodic materials and their application in(non-)Kolbe electrocatalytic decarboxylation of carboxylic acids for the readers.

关键词： Electrocatalytic decarboxylation Carboxylic acid (non-)Kolbe reaction Anode material Catalysis

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

Hybrid structure of iron single atoms and metallic titanium for photothermal ethanol steam reforming

引用

Science China Chemistry 2024年第3期67卷 848-854页

作者： Dachao Yuan Guanda Han Zhixuan Wang Jianguo Zhao Kailuan Li Pengfei Wang Jianjun Hao yaguang Li Jinhua Ye College of Mechanical and Electrical Engineering Technology Innovation Center of Intelligent Agricultural EquipmentHebei Agricultural UniversityBaoding 071001China Research Center for Solar Driven Carbon Neutrality The College of Physics Science and TechnologyInstitute of Life Science and Green DevelopmentHebei UniversityBaoding 071002China International Center for Materials Nanoarchitectonics(WPI-MANA) National Institute for Materials Science(NIMS)1-1 NamikiTsukubaIbaraki 305-0044Japan Graduate School of Chemical Science and Engineering Hokkaido UniversitySapporo 060-0814Japan

Photothermal ethanol steam reforming(ESR) is currently limited by low intrinsic activity and strong solar energy dissipation.Herein,we synthesized Fe single atoms supported on CeO_(2)(SA Fe-CeO_(2)) to exhibit excellent low-temperature ESR activity with a hydrogen production rate of 512 mmol g^(-1)h^(-1) at 350℃,becuase of the high oxidation state of Fe single atoms to weaken the reaction barrier of ethanol decomposition.Furthermore,a heterostructure of SA Fe-CeO_(2) and Ti foil could eliminate 66% of infrared radiation via the size effect,thus achieving a 3.5 sun-driven temperature of 347℃.Consequently,the heterostructure of SA Fe-CeO_(2) and Ti foil shows a hydrogen generation rate of 984 mmol g^(-1)h^(-1) of ESR and 11.31% of solar-to-hydrogen energy conversion efficiency,which outperforms other photothermal ethanol-hydrogen production systems.This study provides a new path for designing active catalytic sites and trapping light energy of photothermal catalysts.

关键词： photothermal catalysis single atoms heterostructure ethanol steam reforming iron

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

二型免疫细胞（Th2/ILC2）在肺部过敏性炎症中作用机制的研究进展

引用

中国免疫学杂志 2024年第1期40卷 11-20页

作者：张亚光孙兵西安交通大学第一附属医院Med-X研究院免疫代谢性疾病研究所中国科学院分子细胞科学卓越创新中心

二型炎症反应主要由二型免疫细胞和二型细胞因子介导，例如二型辅助型T细胞（Th2细胞）和二型先天样淋巴细胞（ILC2细胞），以及IL-4、IL-5、IL-13等。二型炎症反应在体液免疫、抗寄生虫、中和毒素、组织损伤修复和再生等过程中发挥重... 详细信息

二型炎症反应主要由二型免疫细胞和二型细胞因子介导，例如二型辅助型T细胞（Th2细胞）和二型先天样淋巴细胞（ILC2细胞），以及IL-4、IL-5、IL-13等。二型炎症反应在体液免疫、抗寄生虫、中和毒素、组织损伤修复和再生等过程中发挥重要调控作用，但其也有促进疾病发生的作用。目前认为二型炎症反应主要在皮肤、呼吸道、消化道和脂肪等组织中发挥生理和病理性作用，是导致过敏性疾病发生的主要炎症反应类型。呼吸道由于其特殊的免疫微环境，是二型炎症高发区域，涉及的疾病包括慢性鼻窦炎、过敏性鼻炎、过敏性哮喘、过敏性支气管肺曲霉菌病、嗜酸性粒细胞增多的慢性阻塞性肺疾病等。本文将重点综述二型炎症反应中的关键免疫细胞Th2和ILC2细胞在肺部过敏性炎症中的最新研究进展和过敏性炎症相关疾病靶向治疗的情况。

关键词：二型辅助型T细胞二型先天样淋巴细胞肺部过敏性炎症

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Intramolecular spatial charge transfer enhances TADF efficiency

引用

Journal of Semiconductors 2021年第5期42卷 1-3页

作者： Baoyi Ren Chuantian Zuo yaguang sun Liming Ding College of Science Shenyang University of Chemical TechnologyShenyang 110142China Center for Excellence in Nanoscience(CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS)National Center for Nanoscience and TechnologyBeijing 100190China

Organic thermally activated delayed fluorescence (TADF)emitters have been advancing fast since 2012, behaving like the next-generation electroluminescent (EL) materials with the advantages of 100%exciton utilization e... 详细信息

关键词： charge transfer thermally

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

CeO_(2)-ZrO_(2)纳米复合粉体的原位自组装法制备及表征

引用

中国稀土学报 2024年第3期42卷 509-514页

作者：宋志健刘世凯王嘉琳韩碧波孙亚光河南工业大学材料科学与工程学院河南郑州450001

针对氧化锆纳米复合材料组分分布不均和高温处理时晶粒异常长大等问题,本研究采用原位自组装法制备了CeO_(2)-ZrO_(2)纳米复合粉体,研究了CeO_(2)的添加量、不同分散剂以及煅烧条件对ZrO_(2)粉体的相含量及微观形貌的影响。研究结果表明... 详细信息

针对氧化锆纳米复合材料组分分布不均和高温处理时晶粒异常长大等问题,本研究采用原位自组装法制备了CeO_(2)-ZrO_(2)纳米复合粉体,研究了CeO_(2)的添加量、不同分散剂以及煅烧条件对ZrO_(2)粉体的相含量及微观形貌的影响。研究结果表明:在真空条件下煅烧,以聚醚P123作为分散剂、含有10%CeO_(2)的ZrO_(2)粉体对氧化锆四方相实现了全稳,并且其分散性良好,粒径为50~100 nm。真空煅烧中形成的碳可以有效防止CeO_(2)-ZrO_(2)纳米颗粒的异常长大。本文成果可望为高质量陶瓷纳米复合粉体的制备提供支持,具有广阔的应用前景。

关键词：原位自组装法相稳定 CeO_(2)-ZrO_(2) 纳米复合粉体

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

NHC-Ag修饰的钐配合物催化CO_(2)与端炔的羧化反应

引用

精细化工 2024年第4期41卷 865-871页

作者：李金融王文玉王晓娟由立新熊刚孙亚光沈阳化工大学理学院辽宁沈阳110142

将1,3-二(4-羧基苯甲基)-苯并咪唑氯化物(H_(2)BCBI)与Sm(NO_(3))3•6H_(2)O在水热条件下进行反应,得到了二维配位聚合物[Sm(BCBI)(NO_(3))2•H_(2)O]n(Sm-BCBI),将其与乙酸银(AgOAc)作用引入氮杂环卡宾(NHC)-Ag(Ⅰ)催化位点,制备了氮杂环卡宾-银功能化的钐配合物[NHC-Ag(Ⅰ)@Sm-BCBI]。通过单晶X射线衍射仪、PXRD、TGA、XPS、电感耦合等离子发射光谱仪、SEM和EDS对Sm-BCBI和NHC-Ag(Ⅰ)@Sm-BCBI进行了表征,考察了NHC-Ag(Ⅰ)@Sm-BCBI催化CO_(2)(0.1MPa)与苯乙炔(1.0mmol)羧化反应的最佳条件,考察了底物的拓展性。结果表明,Sm-BCBI为二维层状结构;NHC-Ag(Ⅰ)@Sm-BCBI具有良好的热稳定性,且其中的银以+1价形式存在。在反应温度为50℃、以Cs2CO_(3)(1.5 mmol)为碱、N,N-二甲基甲酰胺为溶剂,NHC-Ag(Ⅰ)@Sm-BCB用量70 mg、反应时间为16h的最佳条件下,苯丙炔酸分离产率可达80%。催化剂易回收,循环使用5次后,苯丙炔酸分离产率仍能达到57%。

关键词：氮杂环卡宾-银催化 CO_(2) 端炔羧化反应

来源：

维普期刊数据库

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Recent advances in visible-light-driven conversion of CO_(2)by photocatalysts into fuels or value-added chemicals

引用

Carbon Resources Conversion 2020年第1期3卷 46-59页

作者： Yu Gao Kun Qian Baotong Xu Zheng Li Jiaxin Zheng Shan Zhao Fu Ding yaguang sun Zhenhe Xu The Key Laboratory of Inorganic Molecule-Based Chemistry of Liaoning Province College of Applied ChemistryShenyang University of Chemical TechnologyShenyang 110142China

The photocatalytic conversion of CO_(2)into sustainable,green fuels and value-added chemicals is believed to be an appealing method to overcome both the energy crisis and environmental problems.Numerous efforts have been dedicated to enhance the CO_(2)conversion efficiency and selectivity through developing photocatalysts and CO_(2)reduction systems in recent years.This review gives an overview of the latest progress in photocatalysts for visible-light photocatalytic CO_(2)conversion and recent research advances of heterogeneous photocatalytic CO_(2)conversion systems.Furthermore,The roles of cocatalyst and heterojunctions to increase the efficiency of charge transfer,separation and visible light excitation are discussed.Finally,the challenges and perspectives for visible-light-driven photocatalytic conversion of CO_(2)are proposed.

关键词： Photocatalysis CO_(2) Fuels Visible light

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

“智能制造实训教学系统”创新实训课程教学探索

引用

科教导刊 2024年第5期 103-105页

作者：席佳乐霍亚光孙鑫长安大学现代工程训练中心陕西西安710018

文章基于“智能制造实训教学系统”,以“化整为零、联零为整”的教学思路,“虚实结合”的教学策略,“以赛促教”的评测手段,将智能制造实训教学系统划分为智能加工单元、智能检测单元、总控信息管理三大模块。依据三大模块,分专业、分... 详细信息

文章基于“智能制造实训教学系统”,以“化整为零、联零为整”的教学思路,“虚实结合”的教学策略,“以赛促教”的评测手段,将智能制造实训教学系统划分为智能加工单元、智能检测单元、总控信息管理三大模块。依据三大模块,分专业、分模式设计了层层递进的教学课程,使工业化真正走入课堂,为培养学生的工程思维提供了良好的教学平台。

关键词：智能制造实训教学系统教学设计工程思维

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：