检索结果-南通市图书馆

An analytical model for electrode-ceramic interaction in multilayer piezoelectric actuators

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2007年第2期23卷 199-208页

作者： B.L.Wang j.C.han Center for Composite Materials Harbin Institute of TechnologyHarbin 150001China

The present paper develops an analytical model for multi-electrodes in multi-layered piezoelectric actuators, in which the electrodes are vertical to and terminated at the edges of the medium and electroelastic field concentrations ahead of the electrodes in the multilayer piezoelectric actuators are examined. By considering a representative unit in realistic multilayers, the problem is formulated in terms of electric potential between the electrode tips and results in a system of singular integral equations in which the electric potential is taken as unknown function. Effects are investigated of electrode spacing and piezoelectric coupling on the singular electroelastic fields at the electrode tips, and closed-form expressions are given for the electromechanical field near the electrode tips. Exact solution for un-coupled dielectrics is provided, where no piezoelectric coupling is present.

关键词： Actuators . Piezoelectric materials . Electrodes. Multilayer. Fracture mechanics

A non-nucleophilic electrolyte based on all-inorganic salts with conditioning-free characteristic for rechargeable magnesium batteries

在线全文

学校读者我要写书评

暂无评论

journal of Magnesium and Alloys 2024年第8期12卷 3357-3369页

作者： jiaxin Wen jingdong Yang Xueting Huang Xin Zhang Guangsheng Huang jingfeng Wang Lingjie Li Fusheng Pan Chongqing Industry Polytechnic College Chongqing 401120PR China National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing 400044PR China School of Chemistry and Chemical Engineering Chongqing UniversityChongqing 400044PR China

Conditioning-free electrolytes with high reversibility of Mg plating/stripping are of vital importance for the commercialization of the superior rechargeable magnesium batteries(RMBs).In the present work,a non-nucleophilic electrolyte(denoted as MLCH)based on all-inorganic salts of MgCl_(2),LiCl and CrCl_(3) for RMBs is prepared by a straightforward one-step *** a result,the MLCH electrolyte shows the noticeable performance of high ionic conductivity(3.40 mS cm^(−1)),low overpotential(∼46 mV vs Mg/Mg^(2+)),high Coulombic efficiency(∼93%),high anodic stability(SS,∼2.56 V vs Mg/Mg^(2+))and long-term(more than 500 h)cycling stability,especially the conditioning-free *** main equilibrium species in the MLCH electrolyte are confirmed to be the tetracoordinated anions of[LiCl2(THF)2]−and solvated dimers of[Mg_(2)(μ-Cl)3(THF)6]+.The addition of LiCl can assist the dissolution of MgCl_(2) and activation of the electrode/electrolyte interface,resulting in a superior Mg plating/stripping *** synergistic effect of LiCl,CrCl_(3),a small amount of HpMS and the absence of polymerization THF enable the conditioning-free characteristic of the MLCH ***,the MLCH electrolyte exhibits decent compatibility with the cathodic materials of *** Mg/CuS full cell using the MLCH electrolyte presents a discharge specific capacity of 215 mAh g^(−1)at 0.1 C and the capacity can retain∼72%after 40 ***,the MLCH electrolyte has other superiorities such as the broad sources of materials,low-cost and easy-preparation,leading to the potential prospect of commercial application.

关键词： Rechargeable magnesium batteries Non-nucleophilic electrolyte All-inorganic salt Conditioning-free Mg plating/stripping

Interface-facilitated stable plasticity in ultra-fine layered FeAl/FeAl_(2) micro-pillar at high temperature

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14期73卷 61-65页

作者： Lulu Li Irene j.Beyerlein Weizhong han Center for Advancing Materials Performance from the Nanoscale State Key Laboratory for Mechanical Behavior of MaterialsXi’an Jiaotong UniversityXi'an 710049China Department of Mechanical Engineering Materials DepartmentUniversity of CaliforniaSanta Barbara.CA.93106-5070USA

Fe-Al compounds possess a combination of high strength and corrosion resistance at high ***,increasing Al content to make them lighter results in ***,we investigate the high-temperature behavior of a novel,lightweight,ultra-fine-layered FeAl/FeAl_(2) *** report a transition from unstable to stable plasticity at 450℃.Below 450℃,deformation is dominated by localized shear deformation within the soft FeAl layers,while above 450℃,it proceeds by co-deformation between Fe Al and the brittle FeAl_(2) *** show that co-deformation is associated with the temperature at which the interface converts from sliding to sourcing dislocations for Fe Al_(2).

关键词： Fe-Al alloy Compression High-temperature Interface Dislocation

Redistributing Cu species in Cu-SSZ-13 zeolite as NH3-SCR catalyst via a simple ion-exchange

在线全文

学校读者我要写书评

暂无评论

Chinese journal of Chemical Engineering 2022年第1期35卷 329-341页

作者： Ben Liu Nangui Lv Chan Wang Hongwei Zhang Yuanyuan Yue jingdong Xu Xiaotao Bi Xiaojun Bao National Engineering Research Center of Chemical Fertilizer Catalyst College of Chemical EngineeringFuzhou UniversityFuzhou 350002China Qingyuan Innovation Laboratory Quanzhou 362801China Sinochem Quanzhou Energy Technology Co LtdQuanzhou 362000China Department of Chemical&Biological Engineering University of British Columbia2360 East MallVancouverBC V6T 1Z3Canada State Key Laboratory of Photocatalysis on Energy&Environment College of ChemistryFuzhou UniversityFuzhou 350116China

The nature and distribution of Cu species in Cu-SSZ-13 play a vital role in selective catalytic reduction of NO by NH3(NH3-SCR),but existing methods for adjusting the Cu distribution are complex and difficult to ***,we report a simple and effective ion-exchange approach to regulate the Cu distribution in the one-pot synthesized Cu-SSZ-13 that possesses sufficient initial Cu species and thus provides a“natural environment”for adjusting Cu distribution *** using this proposed strategy,a series of Cu-SSZ-13x zeolites with different Cu contents and distributions were *** is shown that the dealumination of the as-synthesized Cu-SSZ-13 during the ion-exchange generates abundant vacant sites in the double six-membered-rings of the SSZ-13 zeolite for relocating Cu2+species and thus allows the redistribution of the Cu *** catalytic results showed that the ion-exchanged Cu-SSZ-13 zeolites exhibit quite different catalytic performance in NH3-SCR reaction but superior to the parent *** structure–activity relationship analysis indicates that the redistribution of Cu species rather than other factors(e.g.,crystallinity,chemical composition,and porous structure)is responsible for the improved NH3-SCR performance and SO_(2) and H_(2)O *** work offers an effective method to precisely adjust the Cu distribution in preparing the industrial SCR catalysts.

关键词： Catalyst Zeolite Cu-SSZ-13 Ion-exchange Redistribution of Cu species Selective catalytic reduction(SCR)

A PARAMETER-UNIFORM TAILORED FINITE POINT METHOD FOR SINGULARLY PERTURBED LINEAR ODE SYSTEMS＊

在线全文

学校读者我要写书评

暂无评论

journal of Computational Mathematics 2013年第4期31卷 422-438页

作者： Houde han j.j.H. Miller Min Tang Department of Mathematical Sciences Tsinghua University Beijing 100084 China Department of Mathematics Trinity College Dublin 2 Ireland Key Laboratory of Scientific and Engineering Computing Department of Mathematics and Institute of Natural Sciences Shanghai Jiao Tong University Shanghai 200240 China

In scientific applications from plasma to chemical kinetics, a wide range of temporal scales can present in a system of differential equations. A major difficulty is encountered due to the stiffness of the system and it is required to develop fast numerical schemes that are able to access previously unattainable parameter regimes. In this work, we consider an initial-final value problem for a multi-scale singularly perturbed system of linear ordi- nary differential equations with discontinuous coefficients. We construct a tailored finite point method, which yields approximate solutions that converge in the maximum norm, uniformly with respect to the singular perturbation parameters, to the exact solution. A parameter-uniform error estimate in the maximum norm is also proved. The results of numerical experiments, that support the theoretical results, are reported.

关键词： Tailored finite point method Parameter uniform Singular perturbation ODEsystem.

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

中医五形人“金形人”之亚型内涵解析

中华中医药杂志 2024年第6期39卷 3165-3168页

作者：李佳佳贾竑晓 jing-Dong j.han 杨心宇崔静雯吕宏蓬首都医科大学附属安定医院国家精神疾病医学中心国家精神心理疾病临床医学研究中心精神疾病诊断与治疗北京市重点实验室北京100088 首都医科大学人脑保护高精尖创新中心北京100069 北京大学前沿交叉学科研究院北大-清华生命科学联合中心定量生物学中心北京100871 北京大学生命科学学院北京100871

《灵枢·阴阳二十五人》根据中医五行理论,构建了包含25种亚型的形神分类模型。亚型是中医五形人理论模型的具体演绎,具有重要的研究意义。文章为中医五形人亚型内涵解析系列文章之一。根据中医五形人理论,中医金形人每一形人可再分为5... 详细信息

《灵枢·阴阳二十五人》根据中医五行理论,构建了包含25种亚型的形神分类模型。亚型是中医五形人理论模型的具体演绎,具有重要的研究意义。文章为中医五形人亚型内涵解析系列文章之一。根据中医五形人理论,中医金形人每一形人可再分为5种亚型,分别为敦敦然、廉廉然,脱脱然、监监然、严严然。原文行文简练,内涵丰富,但是目前相关研究较少。本研究试图基于文字学、文献学、理论推导及对3D人脸的样本观察,解析中医金形人亚型的内涵,以更好地了解中医金形人及亚型的形神特征,更好地指导中医金行人及亚型的临床辨证。

关键词：五形人金形人阴阳二十五人亚型金行特质能量五行互藏经脉气血盛衰特征

A human circulating immune cell landscape in aging and COVID-19

在线全文

学校读者我要写书评

暂无评论

Protein & Cell 2020年第10期11卷 740-770页

作者： Yingfeng Zheng Xiuxing Liu Wenqing Le Lihui Xie He Li Wen Wen Si Wang Shuai Ma Zhaohao Huang jinguo Ye Wen Shi Yanxia Ye Zunpeng Liu Moshi Song Weiqi Zhang jing-Dong j.han juan Carlos lzpisua Belmonte Chuanle Xiao jing Qu Hongyang Wang Guang-Hui Liu Wenru Su State Key Laboratory of Ophthalmology Zhongshan Ophthalmic CenterSun Yat-sen UniversityGuangzhou 510060China State Key Laboratory of Membrane Biology Institute of ZoologyChinese Academy of SciencesBeiing 100101China National Center for Liver Cancer Second Military Medical UniversityShanghai 200433China Department of Critical Care Wuhan Hankou HospitalWuhan 430012China State Key Laboratory of Stem Cell and Reproductive Biology Institute of ZoologyChinese Academy of SciencesBeijing 100101China Institute for Stem Cell and Regeneration CASBejjing 100101China University of Chinese Academy of Sciences Beijing 100049China Advanced Innovation Center for Human Brain Protection National Clinical Research Center for Geriatric DisordersXuanwu Hospital Capital Medical UniversityBeijing 100053China CAS Key Laboratory of Genomic and Precision Medicine Beijing Institute of GenomicsChinese Academy of SciencesBeijing 100101China China National Center for Bioinformation Beijing 100101China Peking-Tsinghua Center for Life Sciences Academy for Advanced Interdisciplinary StudiesCenter for Quantitative Biology(CQB)Peking UniversityBeijing 100871China Gene Expression Laboratory Salk Institute for Biological StudiesLa JollaCAUSA

Age-associated changes in immune cells have been linked to an increased risk for ***,a global and detailed characterization of the changes that human circulating immune cells undergo with age is ***,we combined scRNA-seq,mass cytometry and sCATAC-seq to compare immune cell types in peripheral blood collected from young and old subjects and patients with *** found that the immune cell landscape was reprogrammed with age and was characterized by T cell polarization from naive and memory cells to effector,cytotoxic,exhausted and reg-ulatory cells,along with increased late natural killer cells,age-associated B cells,inflammatory monocytes and age-associated dendritic *** addition,the expression of genes,which were implicated in coron-avirus susceptibility,was upregulated in a cell subtype-specific manner with ***,COVID-19 promoted age-induced immune cell polarization and gene expression related to inflammation and cellular ***,these findings suggest that a dysreg-ulated immune system and increased gene expression associated with SARS-CoV-2 susceptibility may at least partially account for COVID-19 vulnerability in the elderly.

关键词： aging single-cell sequencing blood COVID-19 immune cells

在线全文

学校读者我要写书评

暂无评论

高硫铝土矿焙烧脱硫及精矿溶出性能研究

有色金属（冶炼部分） 2025年第1期 59-65页

作者：武国宝韩东战中铝郑州有色金属研究院有限公司郑州450041

对某矿区高硫铝土矿进行了不同焙烧方式的脱硫试验,提出了一种模拟流态化焙烧脱硫过程的静态焙烧试验方法,进行了系统的焙烧脱硫试验,确定了较适宜的焙烧脱硫工艺条件,考察了焙烧过程对精矿溶出性能的影响。在磨矿粒度250μm筛下含量≥9... 详细信息

对某矿区高硫铝土矿进行了不同焙烧方式的脱硫试验,提出了一种模拟流态化焙烧脱硫过程的静态焙烧试验方法,进行了系统的焙烧脱硫试验,确定了较适宜的焙烧脱硫工艺条件,考察了焙烧过程对精矿溶出性能的影响。在磨矿粒度250μm筛下含量≥90.84%、焙烧温度580~600℃、焙烧时间2 min的条件下,精矿中全硫(ST)含量可降低至0.50%左右,S2−含量不超过0.10%;在石灰添加量10%、溶出温度265℃、溶出液αk=1.35~1.39及溶出时间50 min的条件下,精矿的氧化铝溶出率>89%,溶出赤泥A/S=1.31~1.34,N/S=0.15~0.16。在相同溶出试验条件下,与原矿相比,焙烧精矿溶出性能变化不大。

关键词：高硫铝土矿焙烧脱硫溶出

Annealing cracking in Zr and a Zr-alloy with low hydrogen concentration

在线全文

学校读者我要写书评

暂无评论

journal of Materials Science & Technology 2024年第15期182卷 165-175页

作者： Xi-Heng Lin Irene j.Beyerlein Wei-Zhong han Center for Advancing Materials Performance from the Nanoscale State Key Laboratory for Mechanical Behavior of MaterialsXi’an Jiaotong UniversityXi’an 710049China Materials Department University of CaliforniaSanta BarbaraCA 93106-5070USA Department of Mechanical Engineering University of CaliforniaSanta BarbaraCA 93106-5070USA

Hydrogen embrittlement,also known as hydrogen-induced cracking,is a longstanding concern for zirco-nium(Zr)and its *** affinity for hydrogen in zirconium results in the formation of brittle *** are conventionally thought to facilitate crack propagation,and the prevailing recommendation to hinder hydride embrittlement involves reducing the hydrogen concentration in the material and ap-plying slow cooling to reduce thermal ***,in Zr with a maximum hydrogen concentration of 43 wppm,we show that cracks initiate unexpectedly after annealing,a step that involves slow cooling and no external *** a suite of high-resolution microscopy,we show that annealing cracks initiate at prismaticδ-hydrides,whose presence is *** microscopic annealing crack paths are conse-quently crystallographic,following the habit plane of these prismaticδ-*** commonly reportedγ-hydride andδ-hydrides that develop on the basal plane are found not to initiate *** rationalize that prismaticδhydrides result from the intergranular thermal residual stresses that develop during slow *** finding of uncommon annealing cracking further advances the mechanistic understanding of hydride embrittlement in zirconium and can lead to new strategies for design and fabrication of advanced zirconium alloys for harsh environments.

关键词： Zirconium Hydride Cracking Habit plane Reorientation