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Synergistically regulated PCL scaffold bioactivity and antibacterial activity by wollastonite and in situ zinc oxide

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Ceramics International 2025年第14期51卷 18573-18586页

作者： Li, Dongying Du, Haocheng Ding, Wenhao Guo, Xiaoping Yuan, Hai Jiang, Jinglu Li, Mengqi Long, Nanbiao Xu, Yong Key Laboratory of Hunan Province for Efficient Power System and Intelligent Manufacturing College of Mechanical and Energy Engineering Shaoyang University Shaoyang422000 China School of Automation Hangzhou Dianzi University Hangzhou310018 China Department of Medical Technology Shaoyang University Shaoyang422000 China Shaoyang Industry Polytechnic College Shaoyang422000 China

Synergistically improving bioactivity and imparting antibacterial function are the problems that need to be solved urgently in the application of polycaprolactone (PCL) scaffolds in the field of tissue engineering. To this end, PCL/wollastonite/zinc oxide (PCL/15Wol + ZnO) composite scaffolds were fabricated by combining triply periodic minimal surfaces (TPMS) design, selective laser sintering (SLS) and in-situ deposition technology. First, the rapid degradation of Wol sustainably released Ca2+ ions, inducing the deposition of osteoid apatite on scaffolds and significantly enhancing bioactivity. Second, ZnO grown in situ on the scaffold provided antibacterial functionality by disrupting bacterial structures through oxidative stress. The results indicated that the composite scaffold immersed in SBF quickly induced the formation of apatite layer, possibly due to the substitution of H+ in solution with Ca2+ in Wol, forming a negatively charged silicon-rich layer that subsequently attracted the deposition of HPO42− via electrostatic interactions. In the degradation experiments, Wol played a crucial role in neutralizing acidic byproducts released during PCL degradation and raising the pH of the solution. Furthermore, in-situ zinc oxide endowed the scaffold with antibacterial activity against Escherichia coli and the antibacterial test showed that the 15Wol composite scaffold had an inhibition zone with a diameter of 17 mm. Moreover, the composite scaffold provided a favorable environment for cell survival, which promoted the adhesion, extension and survival viability of MC3T3-E1 cells. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Laser heating

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Analysis of Hydrocarbon Mixture Performance of a Dual-Channel Swirl Engine

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Journal of Thermal Science 2020年第6期29卷 1391-1397页

作者： YUAN Wenhua HUANG Qilin FU Jun LIAO Jingjing LI Yu HE Yong ZHANG Zengfeng MA Yi School of Mechanical and Energy Engineering Shaoyang UniversityShaoyang 422004China State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan UniversityChangsha 410082China Key Laboratory of Hunan Province for Efficient Power System and Intelligent Manufacturing Shaoyang UniversityShaoyang 422000China

In order to understand and improve the oil and gas mixing performance of a dual-channel vortex chamber diesel engine,the BH175F dual-channel vortex chamber combustion system was used as the research foundation,and the oil-gas mixture process of the combustion system was numerically *** analyzing the cylinder temperature,cylinder pressure,mixing process and combustion process of the combustion system,the mixture performance of the combustion system was *** indicated that:The mixture of the compression Top Dead Center(TDC)started to enter the main combustion chamber through the start-up hole;when the piston reached 4°After Top Dead Center(ATDC),the mixture started to enter the main combustion chamber through the connecting channels A and B,and the high-concentration mixture entered the main combustion from the start-up hole;when the piston continued running down to 20°and 25°ATDC,it could be seen that the main combustion chamber mixture was already relatively uniform;besides,when the equivalence ratio was between 0.8 and 1,the air-ftiel mixture was unevenly distributed in the main combustion *** provides guidance for further improvement of the combustion system.

关键词： gas mixing performance dual-channel vortex chamber combustion system

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Dynamic Simulation Analysis of the Working Device of a ZL50 Loader

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Fluid Dynamics & Materials Processing 2020年第4期16卷 699-707页

作者： Guiju Zhang Caiyuan Xiao Key Laboratory of Hunan Province for Efficient Power System and Intelligent Manufacturing Shaoyang422000China College of Mechanical and Energy Engineering Shaoyang UniversityShaoyang422000China

In this study,assuming a certain type of wheel loader as the main objective of the research,the performances of the working device of the loader are investigated on the basis of an in-house *** creating a three-dimensional model of the working device using Solidworks,this model has been imported into the dynamic simulation software ADAMS,and the simulation problem has been completed by adding the relevant constraints and *** load stress curve relating to the main connecting point of the working device has been obtained in the frame work of this approach and it has been shown that the movement characteristics are compatible with(i.e.,they match)the actual working *** present study may be regarded as a theoretical basis for the design and improvement of the working device of a vast category of wheel loaders.

关键词： ADAMS working device solidworks wheel loader dynamic simulation

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Defence Technology（防务技术） 2021年第2期17卷 531-544页

作者： Gui-ju Zhang Cai-yuan Xiao Olatunj Oladimeji Ojo Key Laboratory of Hunan Province for Efficient Power System and Intelligent Manufacturing Shaoyang422000HunanChina College of Mechanical and Energy Engineering Shaoyang UniversityShaoyang422000HunanChina Department of Industrial and Production Engineering Federal University of Technology AkureAkureNigeria

This paper studies the friction stir spot welding of AA2024-T3/AA7075-T6 Al alloys in the ambient and underwater environments by clarifying the nugget features,microstructure,fracture and mechanical properties of the *** results show that the water-cooling medium exhibits a significant heat absorption capacity in the AA2024-T3/AA7075-T6 welded *** features such as stir zone width,circular imprints,average grain sizes,and angular inter-material hooking are reduced by the watercooling effect in the *** whitish(intercalated structures)bands are formed in the underwater joints while Mg2Si and Al2CuMg precipitates are formed in the ambient and the underwater welded joints *** increase in tool rotational speed(600e1400 rpm)and plunge depth(0.1 e0.5 mm)increases the tensile-shear force of the welded AA2024-T3/AA7075-T6 joints in both the ambient and underwater *** maximum tensile-shear forces of 5900 N and 6700 N were obtained in the ambient and the underwater welds respectively.

关键词： Friction stir spot welding Underwater friction stir spot welding Nugget characterization Microstructure Mechanical properties Fracture

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Achieving high yield of Ti3C2Tx MXene few-layer flakes with enhanced pseudocapacior performance by decreasing precursor size

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Chinese Chemical Letters 2020年第4期31卷 1039-1043页

作者： Jianguang Xu Jiale Zhu Chen Gong Zexin Guan Dan Yang Zhihan Shen Wei Yao Haijiang Wu School of Materials Science and Engineering Yancheng Institute of TechnologyYancheng 224051China Key Laboratory of Hunan Province for Efficient Power System and Intelligent Manufacturing Shaoyang UniversityShaoyang 422000China

Ti3C2Tx,a most studied member of MXene family,shows promise as a candidate electrode for pseudocapacitor due to its electronic conductivity and hydrophilic ***,the unsatisfactory yield of Ti3C2Tx few-layer flakes significantly restricted it in real ***,we proposed a simple solution to boost the yield of Ti3C2Tx few-layer flakes by decreasing precursor *** using the small500 mesh Ti3AlC2 powders as raw material,high yield of 65%was successfully ***,the asreceived small flakes also exhibit an enhanced pseudocapacior performance owing to their excellent electrical conductivity,expanded inte rlayer space and more O content on the *** work not only sheds light on the cost effective mass production of Ti3C2Tx few-layer flakes,but also provides an efficient solution for the design of MXene electrodes with high pseudocapacior performance.

关键词： MXene Ti3C2Tx High yield Pseudocapacitor Precursor size Flake size

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Preparation and Performance Test of Poly Vinyl Chloride Gel Artificial Muscle 5

Preparation and Performance Test of Poly Vinyl Chloride Gel ...

引用

5th International Conference on Advanced Electronic Materials, Computers and Software Engineering, AEMCSE 2022

作者： Tan, Yongfa Luo, Bin Zhu, Kejun Quan, Gan Shaoyang University Key Laboratory of Hunan Province for Efficient Power System and Intelligent Manufacturing Hunan Shaoyang422000 China Shaoyang University Hunan Shaoyang422000 China

ISBN: (数字)9781665484749

ISBN: (纸本)9781665484749

Using direct ink wrinting, this paper trys to realize the integrated printing of PVC gel actuator. The aim is to open up a new way to solve the inherent problems of traditional manufacturing methods and lay a foundation for the wider application of this new artificial muscle material. The basic structure of electroactive PVC gel actuator is the sandwich structure. In order to get good actuating performance, this structure generally needs at least four kinds of materials with different characteristics for four different layers, including core layer, electrode layer, sacrificial layer and insulation layer. Therefore, this paper first explores the preparation and performance characterization of printing inks for these four materials, then studies the printing methods of core layer and electrode layer respectively, and discusses the effects of printing process parameters and structural parameters on printing accuracy and actuating performance. © 2022 IEEE.

关键词： Chlorine compounds

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Preparation and Performance Test of Magnetorheological Rubber Flexible Abrasive 5

Preparation and Performance Test of Magnetorheological Rubbe...

引用

5th International Conference on Advanced Electronic Materials, Computers and Software Engineering, AEMCSE 2022

作者： Quan, Gan Zhu, Kejun Luo, Bin Chen, Zhigang Shaoyang University Key Laboratory of Hunan Province for Efficient Power System and Intelligent Manufacturing Hunan Shaoyang422000 China Shaoyang University Hunan Shaoyang422000 China

ISBN: (数字)9781665484749

ISBN: (纸本)9781665484749

This paper prepared the silicone polymer magnetorheological adhesive by using methyl cyclosiloxane and methyl phenyl cyclosiloxane as main materials and end-capping agents and white carbon black as auxiliary materials. Then, carbonyl iron powder (CIP) and SiC abrasive particles with different content respectively were added to the adhesive to prepare MRGS and MRGS flexible abrasives with various components. Their finishing mechanism was analyzed, and their rheological properties were tested by MCR-301. The following conclusions could be drawn: (1) For MRGS with the same composition, the greater the magnetic flux density is, the greater the initial viscosity and shear stress will be. (2) The higher the content of carbonyl iron powder in MRGS is, the greater the initial viscosity and shear stress will be. © 2022 IEEE.

关键词： Adhesives

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Effect of Polypropylene on characteristics of gas products from biomass gasification

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Process Safety and Environmental Protection 2025年

作者： J. Wang J. Zhang Y. Ye Z. Wang J. Zhong B. Yang School of Mechanical and Energy Engineering College Shaoyang University Shaoyang Hunan Province 422000 China Key Laboratory of Hunan Province For Efficient Power System and Intelligent Manufacturing Shaoyang University Shaoyang 422000 China Shanghai LifenGas Co. Ltd Shanghai City 201802 China Haikou Totem new energy application and research development Co. Ltd Haikou City Hainan Province 572000 China

This study explored the influence of polypropylene (PP) on the composition and characteristics of gas products generated from biomass gasification. The co-gasification of PP and biomass is presented as an effective solution for recycling solid waste while optimizing gas production. Biomass gasification, a promising technology for sustainable energy production, often faces challenges in achieving gas quality. Adding plastic waste, such as PP, offers a potential route to optimize the process and gas products. In this work, a chemical reaction kinetic model was developed with ten reactor units in Aspen Plus to simulate the co-gasification process of PP and biomass, and the compositions of gas products were analyzed, such as hydrogen (H 2 ), carbon monoxide (CO), methane (CH 4 ), carbon dioxide (CO 2 ), and so on. Several factors affecting their characteristics were discussed, including PP mass fraction (X pp ), the oxygen equivalence ratio (ER), and gasification temperature (T). The results showed that the inclusion of PP significantly enhanced the volume fractions of CH 4 and bio-hydrane alkane, and improved lower heating value (LHV), carbon conversion rate and gasification efficiency. The H 2 volume fraction increased with T, reaching a peak of 47.6% at an ER of 0.25 and X PP of 0.41 under 1000°C. The CO volume fraction also increased with T, with peak values ranging from 52.3% to 53.9% at an ER between 0.1 and 0.2 under 1000°C and an X PP of 0.09. CH 4 and bio-hydrane alkane reached maximum volume fractions of 56.9% at an ER of 0.1 and an X PP of 0.8. The syngas volume fraction reached up to 98.7% within an ER range of 0.2 to 0.25 and an X PP range of 0.23 to 0.41 at 1000°C. LHV for bio-gas reached a peak of 25.85 MJ/m³ at an ER of 0.25 and X pp of 0.8 under 800°C. CO₂ emissions declined with increasing T and X pp and decreasing ER. These results proved that integrating plastic waste into the gasification process may serve as a sustainable strategy for optimizing bi

关键词： Biomass gasification Polypropylene Kinetic model Gas products Syngas Bio-hydrane alkane

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Simulation analysis and optimization of thermal performance of crank and connecting rod mechanism of small diesel engine with artificial intelligence 5

Simulation analysis and optimization of thermal performance ...

引用

5th International Conference on intelligent Computing and Control systems, ICICCS 2021

作者： Li, Kangdiao Xiao, Caiyuan He, Lvhang Yi, Bolong Zhu, Libin Zhou, Yuzhao Key Laboratory of Hunan Province for Efficient Power System and Intelligent Manufacturing Shaoyang Hunan422000 China College of Mechanical and Energy Engineering Shaoyang University Shaoyang Hunan422000 China

ISBN: (纸本)9781665412728

Simulation analysis and optimization of thermal performance of crank and connecting rod mechanism of small diesel engine with artificial intelligence is studied in this paper. Artificial neural network is responsible for knowledge acquisition and empirical thinking., artificial intelligence is responsible for logical thinking, and knowledge base is also responsible for the function of knowledge memory, and their joint work can improve the accuracy of the model. The excellent performance parameters can be then converted to breaking design machine by general computer programming, hence, the modeling is applied into the design. The experiment on the proposed framework proves the efficiency. © 2021 IEEE.

关键词： Diesel engines

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ZnO/Ga2O3Optoelectronic Device with Wide Response Wavelength 4

ZnO/Ga2O3Optoelectronic Device with Wide Response Wavelength

引用

4th IEEE New Energy and Energy Storage system Control Summit Forum, NEESSC 2024

作者： Yu, Dingli Li, Tao Li, Jiangtao Xu, Hongduo Shaoyang University Department of Mechanical and Energy Engineering Shaoyang422000 China Key Laboratory of Hunan Province for Efficient Power System and Intelligent Manufacturing Shaoyang422000 China

ISBN: (纸本)9798350389012

Heterojunction optoelectronic devices have always been a research hotspot. In this paper, ZnO/Ga2O3 heterojunction thin films are used to form optoelectronic devices with Ni metal. A 100nm ZnO thin film is magnetron sputtered on a sapphire substrate, then, a 300nm Ga2O3 material is deposited on the ZnO thin film by magnetron sputtering. The high-quality Ga2O3 thin films were obtained by using ZnO as the substrate. After depositing Ni metal electrodes on Ga2O3 thin films, ZnO/Ga2O3 photodetection device is formed. The device has a photoresponse current of more than 10 times than the dark current under a bias of 5V. And this device has a photoresponse time of 1.1s and a relaxation time of 1s, respectively. Compared with ZnO thin film optoelectronic device, ZnO/Ga2O3 device has a wider spectral response and higher photoresponsivity at the same wavelength. This work provides a theoretical and practical basis for the growth of oxide heterojunctions, and has reference significance for the later research of heterojunction thin film devices. © 2024 IEEE.

关键词： Sapphire

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