Prefacedoi: 10.1088/1757-899X/735/1/011001pmid: N/A
7th annual 2019 International Conference on Material Science and Environmental Engineering [MSEE 2019] was held on November 15-16th, 2019, Wuhan, China. MSEE2019 aims to bring researchers, engineers, and students to the areas of Material Science and Environmental Engineering. MSEE2019 features unique mixed topics of Material Science and Advanced Materials, Material Engineering and Application, Environmental Protection and Sustainable Development, Environmental Science and Engineering.We received over 192 submissions from various parts of the world. The Technical Program Committee worked very hard to have all manuscripts reviewed before the review deadline. All the accepted papers have been submitted to strict peer-review by 2-4 referees, and selected based on originality, significance and clarity for the purpose of the conference. The conference program is extremely rich, profound and featuring high-impact presentations of selected papers and additional late-breaking contributions. We sincerely hope that the conference would not only show the participants a broad overview of the latest research results on related fields, but also provide them with a significant platform for academic connection and exchange. There is two keynote speaker and four invited sessions. The keynote speakers are internationally recognized leading experts in their research fields, who have demonstrated outstanding proficiency and have achieved distinction in their profession. The proceedings would be published by IOP Conference Series: Materials Science and Engineering (MSE).We would like to express our sincere gratitude to all the members of Technical Program Committee and organizers for their enthusiasm, time, and expertise. Our deep thanks also go to many volunteers and staffs for the long hours and hard work they have generously given to MSEE2019. The last but not least, we would like to thank all the authors, speaker and participants for their great contributions to the success of MSEE2019.MSEE2019 Organizing Committee
Peer review statementdoi: 10.1088/1757-899X/735/1/011002pmid: N/A
All papers published in this volume of IOP Conference Series: Materials Science and Engineering have been peer reviewed through processes administered by the proceedings Editors. Reviews were conducted by expert referees to the professional and scientific standards expected of a proceedings journal published by IOP Publishing.
Effects of Pt Content on Room-Temperature Hydrogen Sensing Characteristics of Pt-SnO2 Nano-Composite CeramicsWang, Caochuang; Li, Pengcheng; Hu, Yongming; Xu, Liqun; Zhou, Zhen; Chen, Wanping
doi: 10.1088/1757-899X/735/1/012001pmid: N/A
A series of Pt-SnO2 nano-mixtures with 0, 0.25, 1 and 2.5 wt% Pt separately were prepared using SnO2 nanoparticles and H2PtCl6. Through pressing and sintering, Pt-SnO2 nano-composite ceramics with Pt nanoparticles well dispersed have been successfully prepared from the nano-mixtures. Their resistance is found to increase monotonously and greatly with increasing Pt content, which is increased by three orders of magnitude when Pt is increased from 0 to 2.5 wt%. All those samples with a Pt content show distinct responses to hydrogen at room temperature, while their hydrogen sensitivity and their recovery time both decease dramatically with increasing Pt content. These results strongly suggest that Pt as a catalyst promotes oxygen chemisorption on SnO2 and the reaction between hydrogen and oxygen at room temperature. Pt thus has catalytic effects on both hydrogen and oxygen, which leads to quite complicated effects of Pt content on the room-temperature hydrogen sensing behaviors of semiconducting metal oxides.
Experimental Study on Modified Shielding Functional MortarGao, Yi; Lu, Yingjian; Huang, Jing
doi: 10.1088/1757-899X/735/1/012002pmid: N/A
The mortar board was prepared with the content of reduced iron powder, thickness and shielding fabric as variables. The results showed that appropriate content of reduced iron powder could improve the shielding efficiency of mortar, and the peak shielding efficiency of 10mm thick specimens with a dosage of 300kg/m3 reached 16.9db and the 20mm-thick specimens reached 17.1db. The 10mm-thick specimens with shielding fabric reached 73.5db, and the 20mm-thick specimens reached 59.3db
Effect of Surface Burnishing Treatment on Microstructure and Wear Performance of ZK60 Magnesium AlloyZhang, Haiquan; Liu, Yichen; Guo, Peiquan
doi: 10.1088/1757-899X/735/1/012003pmid: N/A
In order to improve the surface properties of high strength magnesium alloy ZK60, the surface burnishing treatment was carried out. The effects of burnishing process parameters on surface roughness, microhardness and microstructure of ZK60 magnesium alloy were studied. And the wear performance of the untreated and the surface burnishing treated samples was compared and analyzed. A gradient microstructure layer of nanocrystalline, ultrafine, deformed and original coarse grains from the treated surface to the matrix was formed on ZK60 alloy by surface burnishing treatment. In comparison with the untreated sample, the surface roughness of the burnishing treated sample was significantly reduced and the surface microhardness was evidently improved. After surface burnishing treatment, the wear of ZK60 sample decreased by 44.58%, and the friction coefficient decreased from 0.328 to 0.293, significantly improving the wear performance.
Preparation and Characterization of Submicron TiO2 Microspheres via Urea-formaldehyde TemplateLin, Shaosen; Du, Shiguo; Lu, Yanling
doi: 10.1088/1757-899X/735/1/012004pmid: N/A
In order to obtain sub-micron TiO2 microspheres with good dispersibility and easy collection, urea-formaldehyde(UF)-TiO2 hybrid microspheres were synthesized by polymerization-induced precipitation in acidic TiO2 sol through the reaction of urea and formaldehyde. The hybrid microspheres and their calcined products were analyzed by scanning electron microscopy, laser particle size analyzer, thermogravimetric analyzer and X-ray Powder diffractometer. The results of morphological characterization showed that the UF-TiO2 hybrid microspheres were spherical and well dispersed, and their particle size ranged from 0.8∼5μm The sub-micron TiO2 microspheres with large pore volume and good dispersion were obtained by calcining and removing the organic components in the hybrid microspheres. Thermogravimetric analysis showed that the proportion of inorganic components in hybrid microspheres was about 20%. XRD analysis showed that the product of calcined hybrid microspheres was single anatase-type titanium dioxide.
Analytic Solutions of Two-photon Rabi Model Based on Bargmann SpaceYan, Zhanyuan; Yao, Xuemin
doi: 10.1088/1757-899X/735/1/012005pmid: N/A
The quantum Rabi model (QRM) is identified as the simplest model to study the interaction between light and matter. In recent years, Braak proposed an alternative more efficient method to obtain the exact solvability and spectrum of the QRM in the Bargmann space, which is appropriate frame for extended squeezed coherent states. Based on this feasible method, some study for the two-photon QRM is concentrated. In this paper we diagonalized the Hamiltonian and obtain the Spectrum of the system of two-photon QRM in the special case that the level splitting of the atom was equal to 0, and compared with Travĕnec’s results without diagonalizing the Hamiltonian. Finally, we confirm the validity of diagonalization for the Hamiltonian in the two-photon QRM.
Characteristic Analysis of Adjustable Speed Equilibrium Loop of an Electric Proportional Three-way ValveLuo, Yanlei; Chen, Wang; Chi, Baokun; Shi, Liming
doi: 10.1088/1757-899X/735/1/012006pmid: N/A
Based on the research of the existing balance valve and valve control balance loop at home and abroad, this paper constructs a quantitative pump adjustable speed balance loop based on proportional three-way valve, on the basis of analyzing the working principle of the circuit. The speed regulation of load motion in the loop is carried out by using the quantitative pump, and the working principle of the circuit is briefly analyzed. Through the analysis of theory and principle, the simulation analysis model of the equilibrium loop and important components is constructed by using AMESim software. Combined with theoretical analysis, the velocity influencing factors of the circuit are put forward, and then the velocity and pressure curves of the model loop under various parameters are obtained by adjusting some parameters which affect the characteristics of the system, which provides some guiding significance for the study of the balance loop of the single-acting cylinder and the optimization design of the next step.
Providing A Long-term Protection for NCM811 Cathode Material by Al2O3 Coating LayerWang, Jing; Yuan, Qiang; Wang, Ran; Tan, Guoqiang; Su, Yuefeng; Li, Danhua; Wu, Feng
doi: 10.1088/1757-899X/735/1/012007pmid: N/A
The degradation of Ni-rich LiNi0.8Co0.1Mn0.1O2 cathode material is successfully suppressed via a facile Al2O3 coating method. The coated Al2O3 layer on the electrode surface is inactive and amorphous, it does not react with the electrolyte and could provide a long-term protection on the electrode during cycling. The electrochemical performance of the modified NCM811 was improved dramatically both at room and elevated temperature. The capacity retention of pristine NCM811 was enhanced from 81.8% to 91.7% when the coating amount reached to 2 wt% at 25°C and much increased from 68.5% to 87.7% at 55°C. Such excellent high temperature performance clearly confirmed the effect of Al2O3 on the structure stability of electrode, it successfully built a favorable protection of the bulk NCM811 from direct contact with electrolyte and suppressed the undesired side reactions.