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Dissolution and diffusion of TiO_2 in the CaO-Al_2O_3-SiO_2 slag

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International Journal of Minerals,Metallurgy and Materials 2014年第4期21卷 345-352页

作者： Zhong-shan Ren Xiao-jun Hu xin-mei hou Xiang-xin Xue Kuo-chih Chou State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing School of Metallurgical and Ecological Engineering University of Science and Technology Beijing School of Materials and Metallurgy Northeastern University

The dissolution of TiO2 in the CaO-Al2O3-SiO2 slag under static conditions was studied in the temperature range from 1643 K to 1703 K. After TiO2 dissolved, the microstructure of the interface between TiO2 and the slag was observed by scanning electron microscopy, and the concentration profiles of Ti4＋and other ions across the TiO2/slag interfaces were analyzed by energy-dispersive X-ray spectroscopy. On the basis of these results, the dissolution behavior of TiO2 was evaluated, and the diffusivity of Ti4＋in the bulk slag was estimated. Ac-cording to the Stokes-Einstein relation, the viscosity calculated by a previously reported model gave a diffusivity of Ti4＋ions greater than that estimated by the concentration profiles of Ti4＋ions. The mechanism of TiO2 dissolution in the CaO-Al2O3-SiO2 slag is discussed in de-tail.

关键词： slags titanium dioxide dissolution diffusion interface

Numerical Simulation of Microstructure Formation and Forecast of Mechanical Properties for Spheroidal Graphite Iron

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Journal of Materials Science & Technology 2003年第Z1期19卷 13-16页

作者： Weimin zhao Shuping hou Haipeng LI Aiwen HU School of Materials Science and Engineering Hebei University of TechnologyTianjin 300132 China Tianjin Commercial University 300400 China School of Materials Science and Engineering Hebei University of TechnologyTianjin 300132 China School of Materials Science and Engineering Hebei University of TechnologyTianjin 300132 China

The numerical simulation can overcome the hardship of mathematical analysis and experimental research, explicate the mechanism of microstructure shaping, predict mechanical properties and operating life of castings and then optimize technology and control microstructure formation to obtain the qualified castings. The finite difference method (FDM) is applied to the simulation of temperature field based on all kinds of nucleation and growth models on all stages of solidification of spheroidal graphite cast iron. Visual C++ is used to program the numerical simulation software, QTstructure-1 to simulate the solidification process of spheroidal graphite cast iron and the formation of all phases in solidification process. Finally, the result of simulation is well agreed with the experimental result.

关键词： Spheroidal graphite iron, Numerical simulation, Finite difference method, Temperature field

Interface regulation strategy of Al-CNTs composite induced by Al-Si eutectic reaction and its strengthening mechanism

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Journal of Materials Science & Technology 2023年第20期151卷 1-9页

作者： xin Zhang xin Li Lei Liu Bo Li Xiaodong hou Deng Pan Lina Gao Shufeng Li School of Materials Science and Engineering Xi’an University of TechnologyXi’an 710048China Xi’an Key Laboratory of Advanced Powder Metallurgy Materials and New Technology Xi’an University of TechnologyXi’an 710048China Centre of Excellence for Advanced Materials Songshan LakeDongguan 523808China

Carbon nanotubes(CNTs)reinforced aluminum matrix composites(AMCs)show broad application prospects in the fields of aerospace and transportation because of their lightweight,high specific strength and specific modulus.A new alloying strategy in this study is proposed to regulate its weak intrinsic interface and uncontrollable interfacial *** results show that Si element could hinder the dissolution and diffusion of carbon atoms in Al matrix,inhibiting Al-CNTs interface *** refinement and dislocation increment induced by the reinforcements promote the contributions to the strength of *** wettability and interface bonding of Al-CNTs could be effectively improved by Al/Si/CNTs composite interface,the formed discontinuous strong interface is advantageous to coordinate the plastic deformation of *** particles can also firmly fix CNTs through pinning effect during deformation,which leads to a better load ***,the tensile strength of Al-5Si-0.5CNTs composite can be enhanced up to 391 MPa while maintaining an acceptable plasticity of 7.5%.It brings the strengthening effect of CNTs into full play in AMCs and achieves the strengthening effect of 1+1>2 under the comprehensive effect of grain refinement strengthening,dislocation strengthening,dispersion strengthening of Si particles and load transfer to CNTs。

关键词： Aluminum matrix composites Interface regulation Microstructure Strengthening effect Mechanical properties

In situ coupled MoO_(3)with CoP/rGO to construct three-dimensional self-supported catalyst for highly efficient alkaline hydrogen evolution reaction

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Journal of Materials Science & Technology 2022年第9期104卷 194-201页

作者： Zhuoran hou Di Yang Yuntao xin Haoyu Huang xin Hu Yuyang Guo Siduo Wu Liwen Hu College of Materials Science and Engineering Chongqing UniversityChongqing 400044China Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and Advanced Materials Chongqing UniversityChongqing 400044China

In order to solve the crisis of energy depletion and protect the beautiful natural environment,the development of efficient,cost-effective and stable hydrogen evolution reaction(HER)electrocatalyst has attracted great attention,but it is still an urgent challenge to fabricate an abundant and low cost *** this article,a novel HER catalyst with heterogeneous structure interfaces was in situ synthesized by multi-step electrodeposition method,and the mechanism of the enhancement of its electrocatalytic activity was elucidated by the combination of density functional theory(DFT)calculation and *** initial overpotential is only 83 mV and the Tafel slope is only 58.5 mV/dec,which is better than most of other reported CoP-based *** the meantime,DFT calculations show that the incorporation of MoO_(3)and rGO leads to electron redistribution among different components,which ensures efficient adsorption and activation of H_(2)O molecules and hydrogen ***,this work will contribute to the understanding of the mechanisms associated with heterojunctions and provide guidance for the rational design of a hybrid catalyst.

关键词： catalyst alkaline rational

Bromate removal by gamma irradiation in aqueous solutions

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Nuclear Science and Techniques 2016年第1期27卷 44-49页

作者： zhao-Lian Ye Xue-Hui Fang Hui-Qi hou College of Chemistry and Environmental Engineering Jiangsu University of Technology Department of Environmental Science and Engineering Fudan University

Bromate(BrO_3) is a disinfection by-product in drinking water, and its removal is very difficult especially at low levels.60 Co gamma rays were used to remove BrO_3in aqueous solution in this study. The effects of absorbed doses, BrO_3initial concentration, gas saturation, p H value and coexisting anions(Cl, NO 3, SO2 4and HCO 3=CO_3^(2 -))on BrO_3reduction were evaluated. After 4.0-k Gy irradiation of air-equilibrated solution of 30.7 lg/L BrO_3, the residual BrO_3was 8.3 lg/L, which is below the maximum contaminant level of drinking water. The BrO_3reduction rate increased with the dose, in the order of N2[ air [ O_2[ N_2O atmosphere under similar conditions. The results also show that high p H favored the BrO_3removal. According to the experimental results, it can be concluded that the efficiency of decomposing BrO_3by reactive species followed the order of e aq[ H [ HO_2 [ O_2. Coexisting Cl, HCO 3=CO_3^(2 -)and SO2 4ions have little effect on BrO_3removal, whereas NO_3can inhibit its removal as a result of competition with BrO_3for e aq.

关键词： γ射线照射水溶液溴酸盐吸收剂量二氧化碳高pH值消毒副产物含气饱和度

Performance Analysis in SWIPT-Based Bidirectional D2D Communications in Cellular Networks

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China Communications 2023年第12期20卷 41-51页

作者： Yang Zhang Wei Wang Xiangmo zhao Jun hou School of Information Engineering Chang’an UniversityXi’an 710064China

In this paper,a novel traffic-aware cooperative cognitive radio network that can enable deviceto-device(D2D)communications in cellular system is proposed and *** providing relay cooperation to cellular transmission,D2D users can realize their own two-way communication in the licensed *** most existing works,in the proposed network,both wireless-powered D2D users can harvest energy via radio-frequency signals received from basic station(BS)through a hybrid protocol which can adaptively utilize both time-switching and powersplitting ***,D2D users perform decode-and-forward operation to transmit signals,and mobile user(MU)employs a selection combining *** addition,the performance of both D2D system and cellular system in the proposed network is evaluated by deriving the expressions of their exact outage probability and *** and simulation results validate correctness of derivations and reveal the influence of various system parameters of the proposed network.

关键词： D2D communication outage probability SWIPT

Sedimentary features and sequence stratigraphy of the successions around the Carboniferous-Permian boundary in the Ordos Basin:links to glacial and volcanic impacts

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Journal of Palaeogeography 2023年第3期12卷 358-383页

作者： Zhong-Shuai hou Shi-Yue Chen zhao Liang Hebei Key Laboratory of Strategic Critical Mineral Resources Hebei GEO UniversityShijiazhuang 050031China Interdisciplinary Science Research Institute Hebei GEO UniversityShijiazhuang 050031China School of Geosciences China University of PetroleumQingdao 266580China

The sedimentary successions around the Carboniferous-Permian boundary(CPB)in the Ordos Basin were investigated using extensive outcrop,borehole,well logging,thin section,and geochemistry data to study sedimentary and sequence stratigraphic responses to glaciation and volcanism in paleotropical transitional *** the studied interval,five distinct lithofacies have been identified,including bauxite,coal,and carbonaceous shale(No.8+9 coal seams),sandstone(Qiaotou),limestone(Baode),and mudstone,which can be classified into three lithofacies *** most complete lithofacies associ-ation is composed of bauxite,coal,carbonaceous shale,sandstone,limestone/mudstone or their combinations from the bottom to the top,while coal and carbonaceous shale,as well as sandstone,are absent locally,resulting in the formation of the other two types of lithofacies *** occurrence of bauxite in-dicates shelf exposure and weathering,the occurrence of coal and carbonaceous shale indicates swampiness of the shelf,and the occurrence of sandstone reveals river rejuvenation;all of these are thought to be sedimentary responses to the transcontinental glacier expansion in Gondwana around the *** presence of limestone and mudstone indicates carbonate platform and lagoon deposition,respectively,in the context of the earliest Asselian transgression caused by volcanism-induced glacier *** lithofacies associations record the regressive-transgressive cycles that occurred because of glaciation and volcanism near the *** top surface of bauxite can be used as a sequence boundary,while the lowstand systems tract consists of the No.8+9 coal seams and the Qiaotou sandstone,and the transgressive systems tract consists of the overlying Baode limestone and laterally equivalent *** lowstand systems tract,which contains source rock and hydrocarbon reservoirs,and the overlying transgressive systems tract,which serves as cap rock,form an excellent source-reservoi

关键词： Glaciation Volcanism Incised valley Sequence stratigraphy Ordos basin

Cenozoic Tethyan changes dominated Eurasian animal evolution and diversity patterns

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Zoological Research 2022年第1期43卷 3-13页

作者： Zhe zhao Zhong-E hou Shu-Qiang Li Key Laboratory of Zoological Systematics and Evolution Institute of ZoologyChinese Academy of SciencesBeijing 100101China

Cenozoic tectonic evolution in the Tethyan region has greatly changed the landforms and environment of Eurasia,driving the evolution of animals and greatly affecting the diversity patterns of Eurasian *** combining the latest Tethyan paleogeographic models and some recently published Eurasian zoological studies,we systematically summarize how tectonic evolution in the Tethyan region has influenced the evolution and diversity patterns of Eurasian *** convergence of continental plates,closure of Tethys Sea,and Tethyan sea-level changes have directly affected the composition and spatial distribution of Eurasian animal *** topographic and environmental changes caused by Tethyan tectonics have determined regional animal diversity in Eurasia by influencing animal origin,dispersal,preservation,diversification,and *** ecological transformations resulted in the emergence of new habitats and niches,which promoted animal adaptive evolution,specialization,speciation,and *** highlight that the Cenozoic tectonic evolution of the Tethyan region has been responsible for much of the alteration in Eurasian animal distribution and has been an essential force in shaping organic ***,we generalize a general pattern that Tethyan geological events are linked with Eurasian animal evolution and diversity dynamics.

关键词： Tethys Mediterranean Biogeography Zoogeography Phylogeny

Synthesis and Excellent Antibacterial Activity of Ag_(2)O-Loaded Carboxymethyl Starch Nanocomposites

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Journal of Ocean University of China 2023年第3期22卷 728-734页

作者： WAN Lina YU Liangmin hou Jin zhao Xia Key Laboratory of Marine Chemistry Theory and Technology Ministry of EducationCollege of Chemistry and Chemical EngineeringOcean University of ChinaQingdao 266100China Shandong Key Laboratory of Corrosion Science Institute of OceanologyChinese Academy of SciencesQingdao 266100China

Carboxymethyl starch/silver oxide nanocomposites(CMS-Ag_(2)O NCs)were successfully fabricated by modifying carboxymethyl starch(CMS)with Ag_(2)O obtained from an aqueous AgNO_(3)solution as silver ***_(2)O nanoparticles(NPs)formed on the surface of CMS by ion *** on SEM images,the diameters of Ag_(2)O NPs were determined to be between 50 and 100 *** the XRD spectra of CMS-Ag_(2)O NCs,the new diffraction peaks appeared at 33.88°and 38.08°,which were attributed to the Ag_(2)O *** to the XPS analysis,Ag 3d_(5/2)and Ag 3d_(3/2)peaks in CMS-Ag_(2)O NCs were fitted into two main peaks centered at 367.6 eV and 373.6 eV,which were attributed to Ag^(+).The antibacterial efficiencies of CMS-Ag_(2)O NCs against Escherichia coli,Staphylococcus aureus,Pseudoalteromonas tetraodonis,Micrococcus luteus,and Shewanella putrefaciens were determined to be 99.6%,99.7%,99.4%,99.5%,and 99.6%,*** antibacterial efficiencies of CMS-Ag_(2)O NCs against the bacterial species were all greater than 99%.Therefore,these results indicated that CMS-Ag_(2)O NCs was highly effective as a bactericidal agent against multiple bacterial ***-Ag_(2)O NCs can be further applied to antifouling coating.

关键词： antibacterial activity silver oxide nanoparticles carboxymethyl starch