检索结果-南通市图书馆

High-temperature mechanical properties of as-extruded AZ80 magnesium alloy at different strain rates

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2022年第7期29卷 1373-1379页

作者： Wenjun Liu Bin Jiang Hongchen Xiang Qing Ye Shengqi Xia Siqiang Chen Jiangfeng Song Yanlong Ma Mingbo Yang college of Materials Science and engineering Chongqing University of TechnologyChongqing 400054China college of Materials Science and engineering Chongqing UniversityChongqing 400044China Chongqing Tsingshan Industrial Chongqing 402761China

The mechanical properties of as-extruded AZ80 magnesium alloy at temperatures of 450-525℃ and strain rates of 3.0 s^(−1)and 0.15 s^(−1)were investigated by tensile tests.Zero ductility of alloy appeared at 500℃ with a strain rate of 0.15 s^(−1),while the zero strength and zero ductility of the alloy were obtained nearly simultaneously at 525℃ with a strain rate of 3.0 s^(−1).The results indicated that the lower strain rate accelerated the arrival of zero ductility.As the temperature increased,the failure mode of the alloy developed from trans-granular fracture to cleavage fracture and then to inter-granular fracture with the feature of sugar-like grains and fusion traces.The existence of the low-melting composite ofβ-Mg_(17)Al_(12) and Al_(8)Mn_(5) particles segregated near the Mg_(17)Al_(12) phase along grain boundaries were demonstrated to be the reason for the brittle fracturing of the AZ80 alloy at high temperatures.Furthermore,microstructural evolution at temperatures approaching the solidus temperature was discussed to clarify magnesium alloy’s high temperature deformation mechanism.

关键词： AZ80 magnesium alloy strain rate microstructural evolution Al_(8)Mn_(5)phase fracture morphology

Two-dimensional MXene hollow fiber membrane for divalent ions exclusion from water

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 260-266页

作者： Guozhen Liu Yanan Guo Baochun Meng Zhenggang Wang Gongping Liu Wanqin Jin State Key Laboratory of Materials-Oriented Chemical engineering College of Chemical EngineeringNanjing Tech UniversityNanjing 211816China

Two-dimensional material membranes with fast transport channels and versatile chemical functionality are promising for molecular separation.Herein,for the first time,we reported design and engineering of two-dimensional Ti_(3)C_(2)Tx MXene(called transition metal carbides and nitrides)membranes supported on asymmetric polymeric hollow fiber substrate for water desalination.The membrane morphology,physicochemical properties and ions exclusion performance were systematically investigated.The results demonstrated that surface hydrophilicity and electrostatic repulsion and size sieving effect of interlayer channels synergistically endowed the MXene hollow fiber membrane with fast water permeation and efficient rejection of divalent ions during nanofiltration process.

关键词： Two-dimensional material MXene membranes Hollow fiber Desalination Nanofiltration

Preface to integrative stratigraphy,biotas,and paleogeographical evolution of the Qinghai-Tibetan Plateau and its surrounding areas

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2024年第4期67卷 895-898页

作者： Shuzhong SHEN Lin DING Maoyan ZHU Xiangdong WANG Tao DENG State Key Laboratory for Mineral Deposits Research School of Earth Sciences and Engineering and Frontiers Science Center for Critical Earth Material CyclingNanjing UniversityNanjing 210023China State Key Laboratory of Tibetan Plateau Earth System Resources and EnvironmentInstitute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China State Key Laboratory of Palaeobiology and Stratigraphy Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and PalaeoenvironmentChinese Academy of SciencesNanjing 210008China college of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 100049China Key Laboratory of Vertebrate Evolution and Human Origins of Chinese Academy of Sciences Institute of Vertebrate Paleontology and PaleoanthropologyChinese Academy of SciencesBeijing 100044China

The Qinghai-Tibetan Plateau(QTP)is well known as the Roof of the World,the Third Pole and the Asian Water Tower.It spans a vast area from the Pamir Plateau in the west to the Longmenshan-Hengduan Mountains in the east,from the Himalaya Mountains in the south to the Kunlun-Qilian Mountains in the north.It stretches approximately 1,200 km from north to south and 2,500 km from east to west.When did the QTP start to uplift?This is still controversial between early and late Cenozoic scenarios.While some scholars advocated its uplift since the India-Asia continental collision at about 65 million years ago in the Paleogene(e.g.,Ding et al.,2017,2022),and the others suggested its uplift since the Miocene(Zheng and Wu,2018).

关键词： uplift Tibetan north

Expert consensus on irrigation and intracanal medication in root canal therapy

在线全文

学校读者我要写书评

暂无评论

International Journal of Oral Science 2024年第1期16卷 26-35页

作者： Xiaoying Zou Xin Zheng Yuhong Liang Chengfei Zhang Bing Fan Jingping Liang Junqi Ling Zhuan Bian Qing Yu Benxiang Hou Zhi Chen Xi Wei Lihong Qiu Wenxia Chen Wenxi He Xin Xu Liuyan Meng Chen Zhang Liming Chen Shuli Deng Yayan Lei Xiaoli Xie Xiaoyan Wang Jinhua Yu Jin Zhao Song Shen Xuedong Zhou Lin Yue Department of Cariology and Endodontology Peking University School and Hospital of Stomatology&National Center of Stomatology&National Clinical Research Center for Oral Diseases&National Engineering Laboratory for Digital and Material Technology of Stomatology&Beijing Key Laboratory of Digital Stomatology&Research Center of Engineering and Technology for Computerized Dentistry Ministry of Health&NMPA Key Laboratory for Dental MaterialsBeijingChina Center of Stomatology Peking University HospitalBeijingChina State Key Laboratory of Oral Diseases&National Center for Stomatology&National Clinical Research Center for Oral Diseases&West China Hospital of Stomatology Sichuan UniversityChengduChina Department of Emergency Peking University School and Hospital of Stomatology&National Center of Stomatology&National Clinical Research Center for Oral Diseases&National Engineering Laboratory for Digital and Material Technology of Stomatology&Beijing Key Laboratory of Digital Stomatology&Research Center of Engineering and Technology for Computerized Dentistry Ministry of Health&NMPA Key Laboratory for Dental MaterialsBeijingChina Restorative Dental Sciences EndodonticsFaculty of DentistryThe University of Hong KongPok Fu LamHong Kong SARChina State Key Laboratory of Oral&Maxillofacial Reconstruction and Regeneration Key Laboratory of Oral Biomedicine Ministry of EducationHubei Key Laboratory of StomatologySchool&Hospital of StomatologyWuhan UniversityWuhanChina Department of Endodontics Shanghai Ninth People’s HospitalShanghai Jiao Tong University School of MedicineCollege of StomatologyShanghai Jiao Tong UniversityNational Clinical Research Center for Oral DiseasesNational Center for StomatologyShanghai Key Laboratory of StomatologyShanghaiChina Department of Operative Dentistry and Endodontics Hospital of StomatologyGuanghua School of StomatologySun Yat-Sen University&Guangdong Provincial Key Laboratory of StomatologyGuangzhouChina State Key Laboratory of Oral&Maxillofacial Reconstruction and R

Chemical cleaning and disinfection are crucial steps for eliminating infection in root canal treatment. However, irrigant selection or irrigation procedures are far from clear. The vapor lock effect in the apical region has yet to be solved, impeding irrigation efficacy and resulting in residual infections and compromised treatment outcomes.

关键词： treatment irrigation Expert

在线全文

学校读者我要写书评

暂无评论

Clinical Complementary Medicine and Pharmacology 2024年第1期4卷 85-94页

作者： Iffat Ara Rita Turcio Tasmia Islam Md.Sabbir Hossain Md.Kamrul Hasan Department of Biochemistry and Molecular Biology Tejgaon CollegeNational UniversityGazipur-1700Bangladesh Department of Pharmacy University of Naples Federico IIvia Domenico Montesano49-80131 Napoli NAItaly Department of Genetic engineering and Biotechnology Jashore University of Science and TechnologyJashore-7408Bangladesh Department of Public Health North South UniversityDhaka-1229Bangladesh

Background:Licochalcone A(LCA)is a flavonoid derived from the roots of Glycyrrhiza uralensis Fisch.ex DC and other related plants.Its natural source has been extensively used in complementary medicine,especially traditional Chinese medicine,to treat various ailments.Identified as a phenolic chalcone compound,LCA has gained significant attention in recent years due to its various pharmacological properties.Objective:The objective of this review article is to assess the anti-aging ralated pharmacological properties of LCA.Method:An exhaustive search of several scientific databases was conducted using various relevant keywords to write this review article on LCA,focusing on its therapeutic applications and anti-aging-related pharmacological activities.Some inclusion and exclusion criteria were strictly followed to retrieve updated relevant articles.Results:A collection of 292 papers were screened,and 131 were included in this review for an in-depth analysis of Licochalcone A,focusing on its anti-aging-related pharmacological activities and relevant mechanisms,and its toxicity and side effects.Moreover,the potential of LCA as a pharmacological product is discussed,emphasizing its health benefits and potential as a pharmaceutical product.Conclusion:These findings indicate that Licochalcone A is a promising natural therapeutic agent for anti-aging therapy and other ailments.

关键词： Licochalcone A Glycyrrhiza uralensis Chalcone Anti-aging Neuroprotective Antioxidant Skin protection Therapeutic agent

Visualization Detection of Solid-Liquid Two-Phase Flow in Filling Pipeline by Electrical Capacitance Tomography Technology

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

Computer Modeling in engineering & Sciences 2022年第4期131卷 465-476页

作者： Ningbo Jing Mingqiao Li Lang Liu Yutong Shen Peijiao Yang Xuebin Qin college of Electrical and Control engineering Xi’an University of Science and TechnologyXi’an710054China college of Energy engineering Xi’an University of Science and TechnologyXi’an710054China

During mine filling,the caking in the pipeline and the waste rock in the filling slurry may cause serious safety accidents such as pipe blocking or explosion.Therefore,the visualization of the innermine filling of the solid-liquid two-phase flow in the pipeline is important.This paper proposes a method based on capacitance tomography for the visualization of the solid-liquid distribution on the section of a filling pipe.A feedback network is used for electrical capacitance tomography reconstruction.This reconstruction method uses radial basis function neural network fitting to determine the relationship between the capacitance vector and medium distribution error.In the reconstruction process,the error in the linear back projection is removed;thus,the reconstruction problem becomes an accurate linear problem.The simulation results showthat the reconstruction accuracy of this algorithm is better than that of many traditional algorithms;furthermore,the reconstructed image artifacts are fewer,and the phase distribution boundary is clearer.This method can help determine the location and size of the caking and waste rock in the cross section of the pipeline more accurately and has great application prospects in the visualization of filling pipelines in mines.

关键词： Electrical capacitance tomography mine backfilling visualization detection image reconstruction radial basis function neural network

Self-catalytic induced interstitial C-doping of Pd nanoalloys for highly selective electrocatalytic dehydrogenation of formic acid

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

Journal of Energy Chemistry 2023年第4期79卷 550-558页

作者： Jun Li Liying Cai Xiaosi Liang Shuke Huang Xiaosha Wang Yongshuai Kang Yongjian Zhao Lei Zhang Chenyang Zhao college of chemistry and environmental engineering Shenzhen UniversityShenzhen 518071GuangdongChina Key laboratory of optoelectronic devices and systems of ministry of education and Guangdong province College of physics and optoelectronic engineeringShenzhen UniversityShenzhen 518067GuangdongChina college of chemistry and environmental engineering Hanshan Normal UniversityChaozhou 521041GuangdongChina

Light-metalloid-atom-doped Pd interstitial nanoalloy is promising candidate for electrocatalysis because of the favorable electronic effect.Herein,an innovative method was developed to synthesize C-doped Pd interstitial nanoalloy using palladium acetate both as metal precursor and C dopant.Elaborate characterizations demonstrated that C atoms were successfully doped into the Pd lattice via self-catalytic decomposition of acetate ions.The as-synthesized C-doped Pd catalysts showed excellent activity and durable stability for formic acid electrooxidation.The mass activity and specific activity at 0.6 V of C-doped Pd were approximately 2.59 A/mg and 3.50 mA cm^(-2),i.e.,2.4 and 2.6 times of Pd,respectively.DFT calculations revealed that interstitial doping with C atoms induced differentiation of Pd sites.The strong noncovalent interaction between the Pd sites and the key intermediates endowed Pd with high-selectivity to direct routes and enhanced CO tolerance.This work presents a sites-differentiation strategy for metallic catalysts to improve the electrocatalysis.

关键词： C-doped Palladium Interstitial nanoalloy Electrocatalysis Formic acid oxidation reaction

The roles of polymer-graphene interface and contact resistance among nanosheets in the effective conductivity of nanocomposites

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 2023年第11期44卷 1941-1956页

作者： Y.ZARE K.Y.RHEE Department of Mechanical engineering(BK21 Four) College of EngineeringKyung Hee UniversityYongin 17104Republic of Korea

The effective conductivity of graphene-based nanocomposites is suggested by the characteristics of polymer-filler interfacial areas as well as the contact resistance between the neighboring nanosheets.The interfacial properties are expressed by the effective levels of the inverse aspect ratio and the filler volume fraction.Moreover,the resistances of components in the contact regions are used to define the contact resistance,which inversely affects the effective conductivity.The obtained model is utilized to predict the effective conductivity for some examples.The discrepancy of the effective conductivity at various ranks of all factors is clarified.The interfacial conductivity directly controls the effective conductivity,while the filler conductivity plays a dissimilar role in the effective conductivity,due to the incomplete interfacial adhesion.A high operative conductivity is also achieved by small contact distances and high interfacial properties.Additionally,big contact diameters and little tunnel resistivity decrease the contact resistance,thus enhancing the effective conductivity.

关键词： polymer nanocomposite operative conductivity graphene interfacial property contact region

A Robust Heterometallic Cd(Ⅱ)/Ba(Ⅱ)-Organic Framework with Exposed Amino Group and Active Sites Exhibiting Excellent CO_(2)/CH4 and C_(2)H_(2)/CH_(4) Separation

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2022年第3期41卷 287-292,I0015页

作者：傅红如蒋玉莹罗家华李婷 college of Chemistry and Chemical engineering Luoyang Normal UniversityLuoyang 471934China college of Materials and Chemical engineering China Three Gorges UniversityYichang 443002China

A microporous and robust bimetal-organic framework[Cd_(2)Ba(NH_(2)-BTB)_(2)]·2(DMA)·2(H_(2)O)(1)was constructed by mixing the heterometallic nodes and an tridentate carboxyl ligand with amino group,benefiting from the synergistic effect of active sites,exposed amino groups and ultramicroporous structure.This compound displays an extraordinary selectivity of CO_(2)/CH4 and C_(2)H_(2)/CH_(4)(16.7 and 146.3)at 298 K and 1 atm,which can exceed those of many reported MOFs under the same conditions.This work provides an important model to design metal-organic frameworks for the adsorption and separation of small gas molecules.

关键词： heterometallic-organic framework C2H2/CH4 separation exposed sites