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Constructing a 3D multichannel structure to enhance performance of Ni–Co–Mn hydroxide electrodes for flexible supercapacitors

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Rare Metals 2024年第1期43卷 148-163页

作者： zhi-hui Xu Shi-Shuai Sun Xue-Lei Li zhi-hui zhang Hai-Ying Li Shuang-Ting Ruan Shou-Gen Yin Key Laboratory of Display Materials and Photoelectric Devices(Ministry of Education)and Tianjin Key Laboratory for Photoelectric Materials and Devices School of Materials Science and EngineeringTianjin University of TechnologyTianjin 300384China College of Science Tianjin University of TechnologyTianjin 300384China School of Materials Science and Engineering Inner Mongolia University of TechnologyHohhot 010051China

The balancing of the electrochemical performance,mechanical stability,and processing technology for applying supercapacitors to flexible and wearable electronics continues to encounter severe ***,we prepare Ni-Co-Mn hydroxide electrodes with a threedimensional multichannel structure via a simple hydrothermal *** are constructed using vertically contiguous nano sheets with a uniform thickness and rough *** electrodes can provide numerous electroactive sites and accelerate the transmission of electrolyte *** relationship between the structure and electrochemical performances is verified by experiments and theoretical ***-dimensional(2D)planar and one-dimensional(1D)fiber electrodes are prepared using a flexible carbon cloth(CC)and carbon fiber(CF),respectively,as *** assembled quasi-solid-state flexible asymmetric supercapacitor(FASC)with a twodimensional sandwich structure using NiCoMn-OH/CC as the electrode achieves a remarkable energy density of73.8 Wh·kg^(-1)at a power density of 1.03 kW·kg^(-1).The quasi-solid-state FASC with a 1D linear structure using NiCoMn-OH/CF as the electrode also attains a high energy density(12.9 Wh·kg^(-1)at a power density of0.75 W·kg^(-1)).Moreover,the electrochemical performances of the NiCoMn/CC//AC/CC and NiCoMn/CF//AC/CF FASCs are not disturbed at different bending angles(0°,45°,90°,135°and 180°),This indicates the superior flexibility of the *** also assemble a self-powered energy-harvesting storage system by integrating FASCs and commercial solar cells to verify its *** displays sustainable development potential for energy storage.

关键词： Supercapacitors Flexible Ni–Co–Mn hydroxide 3D multichannel structure High performances

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A novel acidophile community populating waste ore deposits at an acid mine drainage site

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Journal of Environmental Sciences 2007年第4期19卷 444-450页

作者： HAO Chun-bo zhang Hong-xun BAI zhi-hui HU Qing zhang Bao-guo Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China.

Waste ore samples （pH 3.0） were collected at an acid mine drainage （AMD） site in Anhui, China. The present acidophillc microbial community in the waste ore was studied with 16S rRNA gene clone library and denaturing gradient gel electrophoresis （DGGE）. Eighteen different clones were identified and affiliated withActinobacteria, low G ＋ C Gram-positives, Thermomicrobia, Acidobacteria, Proteobacteria, candidate division TM7, and Planctomycetes. Phylogenetic analysis of 16S rRNA gene sequences revealed a diversity of acidophiles in the samples that were mostly novel. It is unexpected that the moderately thermophilic acidophiles were abundant in the acidic ecosystem and may play a great role in the generation of AMD. The result of DGGE was consistent with that of clone library analysis. These findings help in the better understanding of the generation mechanism of AMD and in developing a more efficient method to control AMD.

关键词： acid mine drainage acidophile 16S rRNA DGGE waste ore

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Endodontic management of the maxillary first molar with special root canals:A case report and review of the literature

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World Journal of Clinical Cases 2020年第12期8卷 2590-2596页

作者： zhi-hui zhang Hai-Lin Yao Yan zhang Xiao Wang Stomatology Department Peking University Third HospitalBeijing 100191China Department of Stomatology Peking University Third Hospital Yanqing HospitalBeijing 102100China

BACKGROUND As the complex anatomy of maxillary first molars is one of the major challenges in endodontic therapy,knowledge of the complicated root canal anatomy and configuration is crucial to ensure the success of endodontic treatment and *** article presents an endodontically managed left maxillary first molar with an unusual palatal root *** available literature on the anatomic variation of maxillary first molars is also *** SUMMARY A 36-year-old man with no medical history presented to the Stomatology Department of Peking University Third Hospital complaining of a toothache during mastication in the maxillary left posterior region for approximately 3 *** had a spontaneous and intermittent toothache that had worsened,particularly at *** diagnosis based on clinical examination,X-ray imaging,and cone beam computed tomography(CBCT)was symptomatic irreversible *** endodontic therapy was performed for the left maxillary first *** root canals revealed by CBCT included a special palatal root canal(1-2-1-shaped),two mesiobuccal root canals,and one distobuccal root *** of the CBCT images confirmed the root canal morphology and the clinician performed more effective cleaning,obturation,and ***,the tooth was restored using composite resin,and the patient was satisfied with the *** CBCT and a complete review of the literature may be beneficial for investigating the root canal system to achieve a biological and functional therapeutic effect.

关键词： Maxillary first molar Root canal anatomy Morphology Endodontic treatment Cone beam computed tomography Case report

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Stability of supersaturated solid solution of quenched Al–X(X 5 Zn, Mg, Cu) binary alloys

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Rare Metals 2014年第2期33卷 139-143页

作者： zhi-hui zhang Bai-Qing Xiong Bao-Hong Zhu Yu-Ting Zuo National Center of Analysis and Testing for Nonferrous Metals& Electronic Materials General Research Institute of Nonferrous

In this study, the changing trend of crystal-lattice constant and the influential factors of the stability of supersaturated solid solutions with various alloying additions in the Al–X（Zn, Mg, Cu） binary alloys were investigated. The samples were analyzed using X-ray diffraction（XRD）,X-ray absorption fine structure（XAFS）, and scanning electron microscope（SEM）. It is found that the addition of Cu causes the largest change of crystal-lattice constant of the Al–xCu supersaturated solid solution binary alloy. The most dramatic change occurs in the initial stage of Cu *** change is stabilized thereafter. Also, at the same alloying element addition to the Al–X（X = Zn, Mg, Cu）binary alloys, the Al–xCu is the most unstable *** factors of the stability include the lattice constant change and the type of alloying element. The larger the lattice constant changes, the more unstable the supersaturated solid solution is. The alloying element, easy to aggregate, often leads to the solid solution less stable.

关键词： Lattice constant Binary Al alloy Supersaturated solid solution Stability

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Parity and carotid atherosclerosis in elderly Chinese women

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Journal of Geriatric Cardiology 2020年第12期17卷 759-765页

作者： Xiao-Yan WANG Fei YE Li-Xiong ZENG Shan TU Wen-zhi LUO Xu DENG zhi-hui zhang Department of Cardiology the Third Xiangya HospitalCentral South UniversityChangshaChina

Background The relationship between parity and atherosclerosis has been reported in some ethnic ***,results regarding Chinese women are still *** study aimed to investigate the association of parity and carotid atherosclerosis,which has a predictive value of subsequent atherosclerotic events in elderly Chinese *** A total of 2,052 participants from the medical examination center of the Third Xiangya Hospital were enrolled in the study.A standardized,structured questionnaire was administered to collect information on subjects’demographic characteristics,socioeconomic status,and cardiovascular risk ***-resolution ultrasound was used to examine carotid plaques and carotid intima-media thickness(IMT).Results The mean age of participants was 66.1±5.5 *** with more birth appeared to have a higher risk of carotid artery plaques.A multivariate-adjusted model yielded an odds ratio of 1.38(95%CI:12%-70%,P=0.003)per birth.A positive association was observed between parity and common carotid IMT(β±SE:0.029±0.006,P<0.001),and internal carotid IMT(β±SE:0.011±0.005,P=0.03)in a univariate model;however,these associations became non-significant in multivariate-adjusted *** common carotid IMT was classified into an IMT≥1 mm group and an IMT<1 mm group,higher parity was associated with more obvious thickening both in the unadjusted model(OR=1.61,95%CI:1.29-2.00,P<0.001)and in the fully adjusted model(OR=1.43,95%CI:1.09-1.88,P=0.01).Conclusions There is a positive association between parity and risk of carotid plaques,as well as between parity and risk of obvious thickening for common carotid IMT in elderly Chinese women,indicating multiparous women might experience more atherosclerotic challenges.

关键词： Atherosclerosis Elderly women Parity

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Metallurgy and Solidification Microstructure Control of Fusion-Based Additive Manufacturing Fabricated Metallic Alloys:A Review

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Acta Metallurgica Sinica(English Letters) 2024年第1期37卷 29-53页

作者： Qiang Li Xing-Ran Li Bai-Xin Dong Xiao-Long zhang Shi-Li Shu Feng Qiu Lai-Chang zhang zhi-hui zhang Key Laboratory of Bionic Engineering(Ministry of Education) and College of Bionic Science and EngineeringJilin UniversityChangchun130022China Institute of Structured and Architected Materials Liaoning Academy of MaterialsShenyang110167China Key Laboratory of Automobile Materials Ministry of Education and Department of Materials Science and EngineeringJilin UniversityChangchun130025China School of Mechanical and Aerospace Engineering Jilin UniversityChangchun130025China School of Engineering Edith Cowan University270 Joondalup DriveJoondalupPerthWA6027Australia

The metal-based additive manufacturing(AM),also referred to as metal 3D printing,has drawn particular interest because it enables direct creation,aided by computationally-directed path design,of intricate components with site-specific compositions and geometrical requirements as well as low buy-to-fly *** the last two decades,the objective of this revolutionary technology has been shifting from only“rapid prototyping”to advanced manufacturing of special high-end products or devices,which,in many aspects,outperform conventional manufacturing *** fusion-based AM,significant progress has been achieved in understanding the processing window of macroscopic scales,non-equilibrium metallurgy of mesoscale scales,and grain evolution of microscopic *** the versatile capacity of AM facilitates new avenues for discovering advanced materials and structures,their potential has still not been fully *** the unique non-equilibrium solidification during the AM process,coarse columnar grains with strong textures are usually developed along the build direction,which downgrades the mechanical *** push the limits of this digital manufacturing,this review attempts to provide in-depth and comprehensive overviews of the recent progress in understanding the evolution and control of the as-built microstructure that has been made recently and the challenges encountered during the AM process.

关键词： Additive manufacturing Temperature field Microstructure control Nanoparticles Functionally graded materials

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Changes of microstructure of different quench sensitivity 7,000 aluminum alloy after end quenching

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Rare Metals 2014年第3期33卷 270-275页

作者： zhi-hui zhang Bai-Qing Xiong Shu-Feng Liu Bao-Hong Zhu Yu-Ting Zuo National Center of Analysis and Testing for Nonferrous Metals & Electronic Materials General Research Institute for Nonferrous Metals

The quench sensitivity and their influential factors of 7,021, 7,085, and 7,050 alloys were investigated by the end quenching test method and the measurement of electrical conductivity, hardness, and microstructure after aging. The results indicate that 7,050 alloy has the largest changes with hardness decreasing from HV 199 to HV 167,and electrical conductivity increases from 16.6 to18.2 MS m-1when the distance from quenched end increases from 2 to 100 mm. Alloys 7,085 and 7,021 have relatively smaller changes. According to the relationship between the hardness and electrical conductivity of a supersaturated solid solution, 7,050 alloy has higher quench sensitivity than 7,085 and 7,021 alloys. The microstructure of 7,050 alloy with higher major alloy element（Zn ？ Mg ？ Cu） addition and Cu element addition is mostly affected by the changes of distance from quenched end. In 7,050 alloy, the size of intragranular precipitates is from about 10-200 nm, and the（sub） grain boundary precipitates are about 20-300 nm. Alloy 7,085 with lower Cu content is moderately affected, while 7,021 is least affected. It is found that with the increase of distance from quenched end, quenched-induced precipitate preferentially nucleates and grows in the（sub） grain boundary and then on the pre-existing Al3 Zr particles.

关键词： 7,000 series aluminum alloy Quenchsensitivity Microstructure Matrix precipitates

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Cutting performance of saw blades with microtextured rougher and finisher sawteeth

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Advances in Manufacturing 2024年第2期12卷 317-334页

作者： Yang Lu Jian-Xin Deng zhi-hui zhang Jia-Xing Wu Ran Wang Yi-Chen Bao Key Laboratory of High Efficiency and Clean Mechanical Manufacture of MOE School of Mechanical EngineeringShandong UniversityJinan250061People’s Republic of China

The problems of severe sawtooth wear,harsh sawing noise,and low surface quality during the processing of circular saw blades need to be *** improve the cutting performance of TiC-based cermet saw blades,microtextures parallel to the cutting edge were fabricated on rough and fine sawteeth by laser *** cutting tests were performed on a sawing platform under lubricated *** of the sawing arc length and working sawtooth cutting force variations were developed for sawing steel pipes,and the accuracy of the sawing force model was verified *** results indicate that the variations in the sawing force are proportional to the sawing arc *** circular saw blades with microtextures that did not penetrate the sawtooth rake face exhibited the lowest cutting force,sawing noise,and highest machined surface ***,the worn-out distance of the rougher and finisher sawteeth was reduced by approximately 7.4%and 44.1%,respectively,compared with conventional circular saw *** main failure modes of sawteeth were tip wear,rake face adhesion,and oxidative *** addition,the mechanism by which the textures improve the cutting and wear properties of TiC-based circular saw blades was *** study provided a significant concept for enhancing the cutting performance of circular saw blades and improving the machined surface quality.

关键词： Circular saw blades Micro textures Cutting performance Wear performance

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Single-Molecule Studies on Artificial Small-Molecule Machines

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CCS Chemistry 2023年第11期5卷 2448-2465页

作者： zhi-hui zhang Hai-Na Feng Guanyu Chi David A.Leigh Liang zhang School of Chemistry and Molecular Engineering East China Normal UniversityShanghai 200062 Department of Chemistry The University of ManchesterManchester M139PL Shanghai Frontiers Science Center of Molecular Intelligent Synthesis School of Chemistry and Molecular EngineeringEast China Normal UniversityShanghai 200062

Molecular machines transduce energy from one form to another through controlled motion in response to *** the ubiquitous use of molecular machines in biology,understanding the detailed mechanisms of such complex structures remains *** progress in studying the modes of operation of synthetic small-molecule machines at the single-molecule level has shed new light on the mechanisms of *** this mini-review,we focus on the study of artificial small-molecule machines using single-molecule techniques,including single-molecule force spectroscopy,single-molecule electrical spectroscopy,and single-molecule optical *** survey the techniques used to monitor single-molecule behavior to date and describe the latest studies on small-molecule machines,highlighting their common features and challenges that need to be overcome to realize the potential of these techniques in unraveling the behavior of small molecule systems.

关键词： artificial molecular machines singlemolecule techniques molecular nanotechnology

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Mechanical Properties of Vermicular Graphite Cast Iron Processed by Selective Laser Surface Alloying with Ultra-fine ZrO2 Ceramic Particulates

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Acta Metallurgica Sinica(English Letters) 2016年第11期29卷 985-992页

作者： Peng-Yu Lin zhi-hui zhang Shu-Hua Kong Hong Zhou Yunhong Liang Xin Tong Lu-Quan Ren The Key Laboratory of Engineering Bionics (Ministry of　Education China) and the College of Biological and　Agricultural Engineering Jilin University (Nanling Campus)Changchun 130025 China The Department of Weld Planning FAW-Volkswagen Co.Ltd. Changchun 130011 China The Key Laboratory of Automobile Materials (Ministry of Education China) and School of Materials Science and Engineering Jilin University (Nanling Campus) Changchun 130025 China The National Engineering Laboratory for Modem Materials Surface Engineering Technology Guangzhou Research Institute of Non-ferrous Metals Guangzhou 510651 China

In this work, the mechanical properties and microstructures of vermicular graphite cast iron processed by selective laser surface alloying with ultra-fine ZrO2 ceramic particulates were investigated. A particulate-reinforced metal matrix composite coating with the thickness of -650 μm was fabricated by laser treatment on the sample surface. The particulates were uniformly distributed in the microstructure of the coating. The tensile strength and microhardness both increased with the particulate fraction, since more tensile load was transferred from the matrix to the reinforcement showing essential strengthening effect. The composite coating also sharply reduced the wear mass loss and thus improved the wear resistance.

关键词： Scanning electron microscopy Mechanical characterization Magnesium alloys Grainrefinement Hardness

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