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PubMed | Zhejiang Industry & Trade Vocational College, Swinburne University of Technology, CSIR - Central Electrochemical Research Institute, Deakin University and National Institute of Nutrition ICMR
Type: | Journal: Colloids and surfaces. B, Biointerfaces | Year: 2014

Biodegradable magnesium-zirconia-calcium (Mg-Zr-Ca) alloy implants were coated with Collagen type-I (Coll-I) and assessed for their rate and efficacy of bone mineralization and implant stabilization. The phases, microstructure and mechanical properties of these alloys were analyzed using X-ray diffraction (XRD), optical microscopy and compression test, respectively, and the corrosion behavior was established by their hydrogen production rate in simulated body fluid (SBF). Coll-I extracted from rat tail, and characterized using fourier transform infrared (FT-IR) spectroscopy, was used for dip-coating the Mg-based alloys. The coated alloys were implanted into the femur bones of male New Zealand white rabbits. In vivo bone formation around the implants was quantified by measuring the bone mineral content/density (BMC/BMD) using dual-energy X-ray absorptiometry (DXA). Osseointegration of the implant and new bone mineralization was visualized by histological and immunohistochemical analysis. Upon surface coating with Coll-I, these alloys demonstrated high surface energy showing enhanced performance as an implant material that is suitable for rapid and efficient new bone tissue induction with optimal mineral content and cellular properties. The results demonstrate that Coll-I coated Mg-Zr-Ca alloys have a tendency to form superior trabecular bone structure with better osteoinduction around the implants and higher implant secondary stabilization, through the phenomenon of contact osteogenesis, compared to the control and uncoated ones in shorter periods of implantation. Hence, Coll-I surface coating of Mg-Zr-Ca alloys is a promising method for expediting new bone formation in vivo and enhancing osseointegration in load bearing implant applications.

Gao Y.,Zhejiang Industry & Trade Vocational College | Fu Q.,Sichuan University | Niu L.,Zhejiang Industry & Trade Vocational College | Shi Z.,Zhejiang Industry & Trade Vocational College
Journal of Materials Science | Year: 2015

The interfacial adhesion is a significant factor for improving mechanical properties of filler-reinforced polymer composites. In this work, the as-spun and hot-stretched poly(phenylene sulfide) (PPS) and multi-walled carbon nanotubes (MWCNTs) composite fibers were prepared. Tensile test showed that large enhancements in tensile strength and modulus were achieved in hot-stretched samples. The strong interfacial interaction leading to the effective load transferring was realized in hot-stretched composite fibers. Further analysis showed that the strong interfacial adhesion might be the result of the formation of π–π interaction between the benzene ring of PPS and the surface of MWCNTs with the help of hot-stretching, which could be the most important reason for the remarkable mechanical enhancement of the hot-stretched composite fibers. © 2015, Springer Science+Business Media New York.

Zhang J.,Wenzhou Vocational & Technical College | Zhang J.,Zhejiang Industry & Trade Vocational College | Shi K.,Huazhong University of Science and Technology
Zhongguo Jixie Gongcheng/China Mechanical Engineering | Year: 2015

An autonomous shop floor control system based on wireless sensor network was proposed to cope with the unforeseen inside and outside disturbances occurring frequently. In this system, the physical objects such as the parts and machines were enriched with competencies and abilities for communicating, computing and decision-making by sensor nodes embedding. A pheromone based control algorithm that imitated ants foraging behavior was developed to make the parts autonomously deciding efficient processing operations and routing paths. To demonstrate the feasibility and advantages of the proposed control system, a prototype implementation was developed, and experiments were made with this prototype implementation. The experimental results illustrate the advantages of the proposed approach and its capacity to surmount perturbations. ©, 2015, China Mechanical Engineering Magazine Office. All right reserved.

Xia S.-X.,Zhejiang Industry & Trade Vocational College
Tien Tzu Hsueh Pao/Acta Electronica Sinica | Year: 2015

The paper proposes a new three-phase four-wire multilevel inverter. Besides the conventional six-switch three-phase full-bridge inverter output, the inverter cascades to a half bridge configuration and has a bootstrap circuit with the load neutral line connecting to the anode of input power. Under the ripple-tracing segmental SPWM(Sinusoidal Pulse Width Modulation), the cascaded half-bridge electricity is obtained when the bootstrap circuit works. The circuit topology structure and its control method reduce the independent direct-current power sources of the multilevel inverter and raise the inverter output voltage. Using the piecewise calculation method, the paper analyzes the ripples and current of the bootstrap capacitor with regular sampling SPWM modulation, and the harmonic waves generated. The analyses and experiments in this paper show that a bootstrap capacitor's capacitance, charging loop resistance, load and modulation degree can affect the capacitor's ripples and current. ©, 2015, Chinese Institute of Electronics. All right reserved.

Lin J.-X.,Zhejiang Industry & Trade Vocational College | Lin J.-X.,Jilin University | Tong X.,Zhejiang Industry & Trade Vocational College | Liu C.-M.,Zhejiang Industry & Trade Vocational College | And 3 more authors.
Zhuzao/Foundry | Year: 2015

Through designing a group of L9(34) orthogonal experiment, microstructure and mechanical properties of alloy with adding different metal elements contents were analyzed, the optimal composition proportion of high strength near eutectic Al-11.6Si-3Cu alloy was determined. The results show that the best process parameter of intuitive analysis is A2B1C3D3 which the adding content of the alloy is (wt.%):0.3%Mg, 0.4% Zn, 0.3% Sb and 0.25% Ti. Variance analysis shows that factor D (addition of Ti) has an significant influence, while A, B, C (addition of Mg, Zn and Sb) have some certain effects, the extent of influence of these four factors on the tensile strength is D>A>C>B; with the process parameter of A2B1C3D2, the tensile strength of alloy was 304.9 MPa. ©, 2015, Chinese Mechanical Engineering Society. All right reserved.

Lin J.,Zhejiang Industry & Trade Vocational College | Lin J.,Jilin University | Tong X.,Zhejiang Industry & Trade Vocational College | Lou Y.,Zhejiang Industry & Trade Vocational College | And 3 more authors.
Jinshu Rechuli/Heat Treatment of Metals | Year: 2015

After adding different percents of Cu, the microstructure and properties of near eutectic Al-11.6Si alloys were investigated by comparing microstructure, fluidity, corrosion resistance and mechanical properties, so as to determine the appropriate content of Cu in this alloy. The results show that with the increase of Cu content, the volume and size of Al2Cu phase increase, the fluidity, corrosion current density and corrosion rate of the alloy increase, but corrosion resistance decreases. The tensile strength of the alloy sharply increases until addition of 3%Cu and then slowly decreases, the highest tensile strength of as-cast and T6 heat treated alloy reaches 257 MPa and 330 MPa, respectively, while the elongation decrease. ©, 2015, Chinese Mechanical Engineering Society of Heat Treatment. All right reserved.

Xia S.,Zhejiang Industry & Trade Vocational College
Taiyangneng Xuebao/Acta Energiae Solaris Sinica | Year: 2015

A new five-level half-bridge cascaded Inverter is presented. It is derived from the traditional H-Bridge by cascading the first-level half-bridge on the two half-bridges and connecting the bootstrap components between the upper and lower cascades. By using the CPS-SPWM, the bootstrap circuit will supply the power for the cascaded half-bridge, and it is not need independent DC power supply, which raises the output voltage of the inverter. On the applications of the inversion of the solar cell, storage cell, super-capacitor and other DC power supplies, the new inverter will decrease the amounts of the cells in series of the power branch. The effect of the load, modulation index, electric resistance of charge circuit and the capacity of the bootstrap electric capacitor on the ripple voltage the bootstrap electric capacitor, charging current and output harmonic wave of the inverter is analyzed by using infinitesimal method. By further analysis and experiments, we verify that it is the multilevel inverter is verified to be a kind of inverter with high voltage utilization and less voltage requirements. ©, 2015, Science Press. All right reserved.

PubMed | Jilin University, Bozok University, RMIT University, Japan National Institute of Materials Science and Zhejiang Industry &Trade Vocational College
Type: | Journal: Scientific reports | Year: 2016

Titanium alloys are receiving increasing research interest for the development of metallic stent materials due to their excellent biocompatibility, corrosion resistance, non-magnetism and radiopacity. In this study, a new series of Ti-Ta-Hf-Zr (TTHZ) alloys including Ti-37Ta-26Hf-13Zr, Ti-40Ta-22Hf-11.7Zr and Ti-45Ta-18.4Hf-10Zr (wt.%) were designed using the d-electron theory combined with electron to atom ratio (e/a) and molybdenum equivalence (Mo

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