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Particles migration behavior during laser keyhole welding of ZL101/TiB_2 composites

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Acta Metallurgica Sinica(English Letters) 2012年第3期25卷 190-200页

作者： Haichao CUI Fenggui LU Xinhua TANG shun yao Shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science andEngineeringShanghai Jiao Tong UniversityShanghai 200030China

Particle redistribution occurred with the flow of pool fluid in laser welding aluminum composites. In order to investigate particle migration behavior, a numerical model was established on laser welding of ZL101-TiB2 composite. TiB2 migration coupling with fluid was realized. The volume-of-fluid （VOF） method was employed to track free fluid surfaces. The travel heat source was realized utilizing the workpiece mo- tion in place of heat source motion, which made the heat load stable. Melting and evaporation enthalpy, recoil force, surface tension and buoyancy were considered in this model. Through the calculation it showed that the simulated weld cross section shape and particle distribution were in good agreement with experimental results.

关键词： Laser welding Numerical simulation Fluid flow Particle migration

Photodegradation of benzothiazole ionic liquids catalyzed by titanium dioxide and silver-loaded titanium dioxide

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Chinese Journal of Chemical Engineering 2020年第5期28卷 1397-1404页

作者： Jinghang Li Huimin Zang shun yao Zicheng Li Hang Song School of Chemical Engineering Sichuan UniversityChengdu 610065China

In recent years,ionic liquids(ILs)have been widely used in extraction,synthesis,electrochemistry and other ***,the environmental impact of ILs has been attracting a lot of attention,and eco-friendly treatment for ILs is becoming a necessary *** this study,photocatalytic degradations of benzothiazole ILs catalyzed by titanium dioxide(TiO2)and silver-loaded titanium dioxide(Ag/TiO2)were studied for the first *** degradation of benzothiazole hexafluorophosphate([C4 Bth]PF6)could reach more than 99%within 240 min with the catalysis of *** improve catalytic efficiency,Ag/TiO2 was synthesized and characterized by UV–Vis diffuse reflectance absorption spectra(DRS)and X-ray photoelectron spectroscopy(XPS).The degradation of[C4 Bth]PF6 could reach more than 99%within 120 min in the degradation catalyzed by Ag/*** photodegradation products of benzothiazole ILs are composed of inorganic substances or organic substances with simpler structures,which are easier to decompose and less *** degradation system proposed by this study could provide a simple,green,safe,and economical method for the efficient treatment of benzothiazole ILs.

关键词： Photocatalysis Degradation Ionic liquid Titanium dioxide

Enhancement of the mechanical properties of polylactic acid/basalt fiber composites via in-situ assembling silica nanospheres on the interface

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Journal of Materials Science & Technology 2021年第25期84卷 182-190页

作者： Xianliang Hou shun yao Zhen Wang Changqing Fang Tiehu Li School of Materials Science and Engineering Northwestern Polytechnical UniversityXi'an710072China Faculty of Printing Packaging and Digital Media TechnologyXi’an University of TechnologyXi'an710048China

A valid strategy to tailor the properties of polylactic acid for more extensive applications was introducing *** this work,basalt fiber assembled with in-situ SiO_(2) nanoparticles on the surface was successfully prepared via hydrothermal method and it was further treated with coupling agent KH-550 to improve interfacial interaction between polylactic acid(PLA)and basalt fibers(BF).It was demonstrated that the introduction of BFS could increase the crystallization of PLA and resulted in forming trans-crystallization based on TG and DSC *** tensile strength of PLA/BF composites raised from 39 MPa to 62.5 MPa with increasing the fiber loading from 1 wt%to 10 wt%.Furthermore,the interfacial interaction could be effectively improved by assembling SiO_(2)(especially with 250 nm in diameter)on BF surface to build mechanical locking,which could keep the PLA matrix in place during the mechanical deformation with the tensile strength value raised from 62.5 MPa to 74.0 *** is noticeable that the impact and flexural properties were effectively increased with the incorporation of in-situ SiO_(2) *** further KH-550 treatment made a positive impact as *** instance,the impact strength and flexural strength of the sample with SiO_(2) and KH-550 modification were improved to 22.49 k J/m^(2) and 146.83 MPa and it enhanced about 42.16%and 41.04%than those of neat PLA,***,an efficient enhancement of mechanical performance was achieved and this concept of assembling in-situ SiO_(2) on silica-based fiber as a modifier was a novel and simple path to design the interfacial construction and properties of the polymer composites.

关键词： Poly(lactic acid) Basalt fiber Silica nanoparticles In-situ assembled Interface interaction

Engineered microneedles arrays for wound healing

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Engineered Regeneration 2022年第3期3卷 232-240页

作者： shun yao Yuan Luo Yongan Wang State Key Laboratory of Toxicology and Medical Countermeasures Beijing Institute of Pharmacology and ToxicologyBeijing 100850China

Wound healing is the regenerative process of original skin structure after destructing by different damage *** to their transdermal delivery capability and high specific surface area,microneedles arrays(MAs)have been recognized as encouraging biomaterials for wound *** this review,we have outlined the engineered MAs used for tissue regeneration and wound *** MAs were first classified by design methodologies such as bionic design,intelligent-responsive design,actively-triggered design,matrix materials innovation,and composite smart ***,the MAs were divided into two categories based on the different loading substances:drug-loaded MAs and living component-loaded ***,we have summed up the important elements of the preceding discussions and forecasted their future evolution.

关键词： Engineered design Microneedles arrays Wound healing

Discrete element method study of solid descending and residence properties in COREX shaft furnace with center gas supply device

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Journal of Iron and Steel Research International 2019年第7期26卷 669-678页

作者： Heng Zhou Qin-fu Hou Ming-yin Kou shun yao Sheng-li Wu School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083 China Department of Chemical Engineering Monash University Clayton VIC 3800 Australia

Solid descending and residence properties in COREX shaft furnace with a center gas supply device (CGSD) were studied using the discrete element method. Solid flow pattern, residence time distribution, and local solid residence time (SRT) were analyzed. Moreover, the effects of the rotation speed of screws, the radius, and height of CGSD were investigated. The results show that the solid flow is dominantly a plug flow in the shaft furnace with the CGSD. In the upper region of the shaft furnace for gas-solid reduction, uniform distribution of local SRT is observed, which is preferable to match the even gas distribution expected due to the CGSD and slots. For different rotation speeds of the screws, the distribution of solid flow patterns is similar. The averaged residence time, dispersed plug volume fraction, and dead volume fraction decrease with increasing the rotation speed of the screws. The radius of the CGSD affects the solid residence in the shaft furnace. Local SRT above the CGSD increases with the increase in the radius of CGSD, possibly leading to the formation of more agglomerates. Hence, the radius of CGSD should be chosen carefully. The height of CGSD has a minor effect on solid residence in the shaft furnace.

关键词： COREX shaft furnace Solid residence time Discrete element method Center gas supply device Solid descending

Fabrication and characterization of novel tentacle-type adsorbent for resolution of chiral drugs

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Chinese Science Bulletin 2013年第27期58卷 3390-3397页

作者： ZHU WeiXia WANG QuanYi DU KaiFeng yao shun SONG Hang Department of Pharmaceutical & Biological Engineering School of Chemical Engineering Sichuan University

Novel tentacle-type chiral adsorbent based on silica gels modified with β-cyclodextrin (β-CD) and polyvinyl alcohol(PVA) is synthesized by surface grafting technique. The adsorption behavior of chiral pharmaceuticals using the resulting adsorbents is investigated. In the study, FT-IR and thermogravimetric analysis (TGA) are employed to characterize the chemical and physical properties of the adsorbent; mandelic acid (MA) serves as model solute to evaluate the sorption capacity and selectivity of the adsorbent. The experimental results show that the novel tentacle-type adsorbent is possessed of larger equilibrium adsorption capacity and better selectivity over the conventional one and could be as potential chiral stationary phase (CSPs).

关键词：手性药物吸附剂手型表征小说制备拆分表面接枝技术

Effect of cross-section shape of rotating chute on particle movement and distribution at the throat of a bell-less top blast furnace

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Particuology 2019年第3期17卷 194-206页

作者： Mingyin Kou Jian Xu Shengli Wu Heng Zhou Kai Gu shun yao Bingjie Wen School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083 China Department of Metallurgical Engineering College of Materials Science and Engineering Chongqing University Chongqing 400044 China

Rotating chutes are widely used to control the burden distribution and enhance the gas distribution in a blast *** chute cross-section shape has a significant effect on the particle movement and ***,this study developed a three-dimensional model of a blast furnace top with rotating chute using the discrete element *** effect of different chute shapes on the particle movement and radial burden distribution was then *** results showed that the burden stream height at the chute discharge agrees well with the burden stream thickness at the burden surface.A semicircular chute had the largest main striking point,where the chute discharge joins the burden surface,and trapezoidal and rectangular chutes had successively smaller *** semicircular chute helped to obtain a uniform radial size *** trapezoidal chute helped form an aggregated burden stream at low rotating speeds,while the rectangular shape chute achieved this at higher rotating speeds and different chute angles.

关键词： Blast furnace Chute shape Burden size segregation Discrete element method

Efficient and mild cyclization procedures for the synthesis of novel 2-amino-4H-pyran derivatives with potential antitumor activity

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Chinese Chemical Letters 2014年第7期25卷 1011-1013页

作者： Dao-Cai Wang Yong-Mei Xie Chen Fan shun yao Hang Song Department of Pharmaceutical and Biological Engineering College of Chemical EngineeringSichuan University State Key Laboratory of Biotherapy West China HospitalWest China Medical SchoolSichuan University

A series of novel 2-amino-4H-pyran derivatives have been synthesized via a three-component reaction of α,β-unsaturated ketone derivatives, malononitrile, aldehydes in excellent yields, using DBU as a catalyst and ethanol as a cheap, safe, and environmentally benign solvent under mild conditions. Their antitumor activity was evaluated in three human tumor cell lines, including human colon cancer （HCT116）, human cervical cancer （Hela）. and non-small cell lung cancer （H1975）.

关键词： Synthesis 2-Amino-4H-pyran derivatives Multicomponent Anticancer

Influence of annealing temperatures on microstructure evolution and mechanical properties in a low-carbon steel

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Journal of Iron and Steel Research International 2020年第8期27卷 981-991页

作者： You-hui Jiang shun yao Wei Liu Yun Han Su-peng Liu Geng Tian Ai-min Zhao Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing 100083China Institute of Engineering and Technology University of Science and Technology BeijingBeijing 100083China China Shougang International Trade Engineering Co. Ltd.Beijing 100082China Shougang Research Institute of Technology Beijing 100043China

Quenching and partitioning (Q&P) heat treatments with different annealing temperatures and fixed initial quenching tem-peratures were applied to cold-rolled low-carbon steel with the initial microstructure of ferrite and pearlite, aiming to gain the same amount of austenite (preset value) before the partitioning stage. The chemical compositions of the material have been specially designed, containing 1.6 wt.% silicon and 0.8 wt.% aluminum to avoid the precipitation of carbides. The micro-structure evolution of the investigated steel was characterized using a dilatometer, an optical microscope, a scanning electron microscope (SEM), an X-ray diffractometer, an electron backscattered diffraction and transmission electron microscope. Consequently, the microstructure of all samples looks quite similar. At the same time, according to SEM micrographs and dilatometer data, there are competitive reactions in Q&P process, such as the precipitation of carbides, the transformation of bainite and the formation of secondary martensite. Thus, the measured austenite is less than the preset values. Mechanical properties of the material were detected by uniaxial tensile tests. The results indicate that the ultimate tensile strength of the four groups of samples is similar, but the total elongation has a significant downward tendency with the increase in annealing temperatures. After annealing at 840 ℃, the steel possesses great ultimate tensile strength of about 1200 MPa and optimum total elongation of about 20.37% with favorable products of strength and elongation of about 24.35 GPa%.

关键词： Quenching and partitioning Intercritical annealing Microstructure evolution Mechanical propriety Retained austenite