检索结果-南通市图书馆

Cell behaviors on surface of pure tantalum with nano-dimpled structure

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2019年第6期38卷 543-551页

作者： Jun-Wei Ma rui zan Wen-Zhi Chen Jia-Hua Ni Xiao-Nong Zhang State Key Laboratory of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China California Nanosystems Institute University of CaliforniaLos AngelesCaliforniaCA 90095USA

Tantalum exhibits excellent biocompatibility and good chemical stability, which has been employed in dental and orthopedic *** local microenvironment of the surface of implants influence determines the surrounding cell *** this work, nano-dimpled structure on the surface of pure tantalum was fabricated by electrochemical *** surface morphology of the nano-dimpled structure was observed, and the dimensions of the nano-dimpled structure were measured by scanning electron microscopy(SEM).The surface roughness of the sample with nano-dimpled structure was measured by atomic force microscopy(AFM).The results show that the diameter of nano-dimpled ranges from 40 to 180 nm, and the higher the applied voltage, the larger the ***, nano-dimpled structure has good *** vitro results show that nano-dimpled structure can promote the adhesion and proliferation of mouse cranial anterior bone(MC-3T3-E1) *** filopodia of MC-3T3-E1 cells can be fully extended on this nano-dimpled *** the surface of the nano-dimpled structure with a dimple size of 40 nm, the cells have the longest aspect *** small dimple size of the nanodimpled structure is beneficial to cell proliferation and osteogenic differentiation.

关键词： Tantalum Nano-dimpled structure Cell behaviors Anodization

Translational status of biomedical Mg devices in China

在线全文

学校读者我要写书评

暂无评论

Bioactive Materials 2019年第1期4卷 358-365页

作者： Yu Sun Hongliu Wu Wenhui Wang rui zan Hongzhou Peng Shaoxiang Zhang Xiaonong Zhang State Key Laboratory of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai200240China Suzhou Origin Medical Technology Co.Ltd. Suzhou215513China

Magnesium(Mg)and its alloys as temporary medical implants with biodegradable and properly mechanical properties have been investigated for a long *** are already three kinds of biodegradable Mg implants which are approved by Conformite Europeene(CE)or Korea Food and Drug Administration(KFDA),but not China Food and Drug Administration(CFDA,now it is National Medical Products Administration,NMPA).As we know,Chinese researchers,surgeons,and entrepreneurs have tried a lot to research and develop biodegradable Mg implants which might become other new approved implants for clinical *** in this review,we present the representative Mg implants of three categories,orthopedic implants,surgical implants,and intervention implants and provide an overview of current achievement in China from academic publications and Chinese *** would like to provide a systematic way to translate Mg and its alloy implants from experiment designs to clinical products.

关键词： Magnesium Implant Device Biomedical translation China

In vitro crevice corrosion of biodegradable magnesium in different solutions

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 Materials Science & Technology 2020年第17期52卷 83-88页

作者： Bowei Chen Hongliu Wu ruibang Yi Wenhui Wang Haidong Xu Shaoxiang Zhang Hongzhou Peng Junwei Ma Haomiao Jiang rui zan Shuang Qiao Yu Sun Peng Hou Pei Han Jiahua Ni Xiaonong Zhang State Key Laboratory of Metal Matrix Composites School of Material Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China School of Materials Science and Engineering Central South UniversityChangsha 410083China Suzhou Origin Medical Technology Co.Ltd. Suzhou 215513China Orthopaedic Department Shanghai Jiao Tong University Affiliated Sixth People's HospitalShanghai 200233China Department of Mechanical Engineering Massachusetts Institute of TechnologyCambridgeMassachusetts 02139USA

Magnesium(Mg)is a promising biomedical metal because of its *** crevice between tissue and Mg implant can not be neglected in some implantation sites due to inducing crevice corrosion of *** this paper,a new single mold was designed to build the in vitro experimental setup and four kinds of solutions,*** deionized water(DW),the 0.9 wt.%sodium chloride solution(NaCl),the phosphate buffer saline(PBS)and the modified simulated body fluid(m-SBF)were used to explore necessary factors of crevice corrosion in *** was observed that crevice corrosion in Mg sheets would occur in NaCl and PBS solution under 0.2,0.5 and 0.8 mm crevice *** it was found that there were two necessary factors,*** ion and crevice dimension,in crevice *** the high-purity Mg cannulated screws,crevice corrosion could occur inside tunnel when immersed in PBS.

关键词： Mg Crevice corrosion Cannulated screw Chloride ion Crevice size

In-Plane Dynamic Crushing Behaviors of a Vertex-Based Hierarchical Auxetic Honeycomb

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Solida Sinica 2024年第1期37卷 53-62页

作者： Yichen zan Xiuhui Hou Zichen Deng School of Mechanics Civil Engineering and ArchitectureNorthwestern Polytechnical UniversityXi'an 710072China MIIT Key Laboratory of Dynamics and Control of Complex Systems Northwestern Polytechnical UniversityXi'an 710072China School of Aeronautics Northwestern Polytechnical UniversityXi'an 710072China State Key Laboratory of Structural Analysis Optimization and CAE Software for Industrial EquipmentDalian University of TechnologyDalian 116024China

Auxetic metamaterials,which exhibit the negative Poisson’s ratio(NPR)effect,have found wide applications in many engineering ***,their high porosity inevitably weakens their bearing capacity and impact *** improve the energy absorption efficiency of auxetic honeycombs,a novel vertex-based hierarchical star-shaped honeycomb(VSH)is designed by replacing each vertex in the classical star-shaped honeycomb(SSH)with a newly added self-similar *** analytical model is built to investigate the Young’s modulus of VSH,which shows good agreement with experimental results and numerical *** in-plane dynamic crushing behaviors of VSH at three different crushing velocities are investigated,and empirical formulas for the densification strain and plateau stress are *** results reveal more stable deformation modes for VSH,attributed to the addition of self-similar star-shaped ***,compared with SSH under the same relative densities,VSH exhibits better specific energy absorption and higher plateau ***,VSH is verified to be a better candidate for energy absorption while maintaining the auxetic *** study is expected to provide a new design strategy for auxetic honeycombs.

关键词： Vertex-based hierarchical star-shaped honeycomb Auxetic honeycomb Energy absorption Plateau stress Negative Poisson's ratio

A novel lean alloy of biodegradable Mg-2Zn with nanograins

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Bioactive Materials 2021年第12期6卷 4333-4341页

作者： Wenhui Wang Carsten Blawert rui zan Yu Sun Hongzhou Peng Jiahua Ni Pei Han Tao Suo Yang Song Shaoxiang Zhang Mikhail L.Zheludkevich Xiaonong Zhang State Key Laboratory of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai200240China Magnesium Innovation Centre(MagIC) Institute of Materials ResearchHelmholtz-Zentrum GeesthachtGeesthacht21502Germany Department of Mechanical Engineering Massachusetts Institute of TechnologyCambridgeMA02139United States Orthopaedic Department Shanghai Jiao Tong University Affiliated Sixth People’s HospitalShanghai200233China Zhongshan Hospital Fudan University Shanghai200233China Suzhou Origin Medical Technology Co.Ltd. Jiangsu215513China

Lean alloy(low alloyed)is beneficial for long-term sustainable development of metal *** a nanocrystalline microstructure is a desirable approach to improve biodegradability and mechanical properties of lean biomedical Mg alloy,but it is nearly impossible to *** the present study,the bulk nanocrystalline Mg alloy(average grain size:~70 nm)was successfully obtained by hot rolling process of a lean Mg-2wt.%Zn(Z2)alloy and both high strength((223 MPa(YS)and 260 MPa(UTS))and good corrosion resistance(corrosion rate in vivo:0.2 mm/year)could be *** microstructure evolution during the rolling process was analyzed and *** factors including large strain,fine grains,strong basal texture,high temperature and Zn segregation conjointly provided the possibility for the activation of pyramidalslip to produce *** finding could provide a new development direction and field of application for lean biomedical Mg alloys.

关键词： Magnesium alloy Nanocrystal Biodegradable Rolling Microstructure

Controlled release of hydrogen by implantation of magnesium induces P53-mediated tumor cells apoptosis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Bioactive Materials 2022年第3期7卷 385-396页

作者： rui zan Hao Wang Weijie Cai Jiahua Ni Berengere J.C.Luthringer-Feyerabend Wenhui Wang Hongzhou Peng Weiping Ji Jun Yan Jiazeng Xia Yang Song Xiaonong Zhang State Key Laboratory of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai200240China Institute of Metallic Biomaterials Department of Biological CharacterisationHelmholtz-Zentrum Geesthacht(HZG)Geesthacht21502Germany Department of General Surgery and Translational Medicine Center Wuxi No.2 People’s HospitalAffiliated Wuxi Clinical College of Nantong UniversityJiangsu214002China Orthopaedic Department Shanghai Jiao Tong University Affiliated Sixth People’s HospitalShanghai200233China Department of General Surgery Shanghai Jiao Tong University Affiliated Sixth People’s HospitalShanghai200233China Suzhou Origin Medical Technology Co.Ltd. Suzhou215513China

Hydrogen has been used to suppress tumor growth with considerable *** of hydrogen gas and oral ingestion of hydrogen-rich saline are two common systemic routes of hydrogen *** have developed a topical delivery method of hydrogen at targeted sites through the degradation of magnesium-based ***,the underlying mechanism of hydrogen’s role in cancer treatment remains ***,we investigate the mechanism of tumor cell apoptosis triggered by the hydrogen released from magnesium-based *** find that the localized release of hydrogen increases the expression level of P53 tumor suppressor proteins,as demonstrated by the in vitro RNA sequencing and protein expression ***,the P53 proteins disrupt the membrane potential of mitochondria,activate autophagy,suppress the reactive oxygen species in cancer cells,and finally result in tumor *** anti-tumor efficacy of magnesium-based biomaterials is further validated in vivo by inserting magnesium wire into the subcutaneous tumor in a *** also discovered that the minimal hydrogen concentration from magnesium wires to trigger substantial tumor apoptosis is 91.2μL/mm^(3)per day,which is much lower than that required for hydrogen *** together,these findings reveal the release of H2 from magnesium-based biomaterial exerts its anti-tumoral activity by activating the P53-mediated lysosome-mitochondria apoptosis signaling pathway,which strengthens the therapeutic potential of this biomaterial as localized anti-tumor treatment.

关键词： Biodegradable magnesium Hydrogen Tumor apoptosis Underlying mechanism P53

Bioleaching of vanadium from stone coal vanadium ore by Bacillus mucilaginosus:Influencing factors and mechanism

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2024年第8期31卷 1828-1838页

作者： Yingbo Dong Jinyu zan Hai Lin School of Energy and Environmental Engineering University of Science and Technology BeijingBeijing 100083China Beijing Key Laboratory on Resource-oriented Treatment of Industrial Pollutants Beijing 100083China

Vanadium and its derivatives are used in various industries,including steel,metallurgy,pharmaceuticals,and aerospace *** China has massive reserves of stone coal resources,these resources have low ***,the effective extraction and recovery of metallic vanadium from stone coal is an important way to realize the efficient resource utilization of stone coal vanadium ***,Bacillus mucilaginosus was selected as the leaching *** vanadium leaching rate reached 35.5%after 20 d of bioleaching under optimal operating *** cumulative vanadium leaching rate in the contact group reached 35.5%,which was higher than that in the noncontact group(9.3%).The metabolites of ***,such as oxalic,tartaric,citric,and malic acids,dominated in bioleaching,accounting for 73.8%of the vanadium leaching ***,during leaching,the presence of stone coal stimulated the expression of carbonic anhydrase in bacterial cells,and enzyme activity increased by 1.335-1.905 *** activity positively promoted the production of metabolite organic acids,and total organic acid content increased by 39.31 mg·L^(-1),resulting in a reduction of 2.51 in the pH of the leaching system with stone *** effect favored the leaching of vanadium from stone *** force microscopy illustrated that bacterial leaching exacerbated corrosion on the surface of stone coal beyond 10 *** study provides a clear and promising strategy for exploring the bioleaching mechanism from the perspective of microbial enzyme activity and metabolites.

关键词： Bacillus mucilaginosus stone coal vanadium ore bioleaching carbonic anhydrase organic acids

Topologically protected entanglement switching around exceptional points

在线全文

学校读者我要写书评

暂无评论

Light(Science & Applications) 2024年第8期13卷 1631-1644页

作者： zan Tang Tian Chen Xing Tang Xiangdong Zhang Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurements of Ministry of Education Beijing Key Laboratory of Nanophotonics&Ultrafine Optoelectronic SystemsSchool of PhysicsBeijing Institute of Technology100081 BeijingChina

The robust operation of quantum entanglement states is crucial for applications in quantum information,computing,and communications^(1–3).However,it has always been a great challenge to complete such a task because of decoherence and ***,we propose theoretically and demonstrate experimentally an effective scheme to realize robust operation of quantum entanglement states by designing quadruple degeneracy exceptional *** encircling the exceptional points on two overlapping Riemann energy surfaces,we have realized a chiral switch for entangled states with high *** to the topological protection conferred by the Riemann surface structure,this switching of chirality exhibits strong robustness against perturbations in the encircling ***,we have experimentally validated such a scheme on a quantum walk *** work opens up a new way for the application of non-Hermitian physics in the field of quantum information.

关键词： exceptional quantum Riemann

Surface wave inversion with unknown number of soil layers based on a hybrid learning procedure of deep learning and genetic algorithm

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Earthquake Engineering and Engineering Vibration 2024年第2期23卷 345-358页

作者： zan Zhou Thomas Man-Hoi Lok Wan-Huan Zhou Department of Civil and Environmental Engineering Faculty of Science and TechnologyUniversity of MacaoMacaoChina

Surface wave inversion is a key step in the application of surface waves to soil velocity ***,a common practice for the process of inversion is that the number of soil layers is assumed to be known before using heuristic search algorithms to compute the shear wave velocity profile or the number of soil layers is considered as an optimization ***,an improper selection of the number of layers may lead to an incorrect shear wave velocity *** this study,a deep learning and genetic algorithm hybrid learning procedure is proposed to perform the surface wave inversion without the need to assume the number of soil ***,a deep neural network is adapted to learn from a large number of synthetic dispersion curves for inferring the layer ***,the shear-wave velocity profile is determined by a genetic algorithm with the known layer *** applying this procedure to both simulated and real-world cases,the results indicate that the proposed method is reliable and efficient for surface wave inversion.

关键词： surface wave inversion analysis shear-wave velocity profile deep neural network genetic algorithm