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Effect of pre-oxidation degree on gaseous reduction of pre-oxidized ilmenite concentrate by CO

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Journal of Iron and Steel Research International 2022年第6期29卷 881-890页

作者： Shi-qing Zhao Xiao-dong lv Zhi-ming Yan Xue-wei lv Wei lv Chen-guang Bai College of Materials Science and Engineering Chongqing UniversityChongqing 400044China Advanced Manufacturing&Materials Centre University of WarwickCoventry CV47ALUK School of Metallurgy Northeastern UniversityShenyang 110819LiaoningChina

The effect of pre-oxidation degree of Panzhihua ilmenite concentrate on the gaseous reduction by carbon monoxide was *** raw ilmenite concentrates were pre-oxidized at 600,700,800,900,and 1000°C for 2 h,*** phase change,FeO content,and morphology after the oxidation at various temperatures were *** oxidation degree was calculated according to the change of FeO *** was performed on the oxidized ilmenite concentrate samples(oxidized at 600,800,and 1000°C)at 850,900,and 950°C,*** results show that the pre-oxidation of ilmenite concentrate can accelerate the reduction process:the higher pre-oxidation degree,the faster reduction *** high pre-oxidation degree of ilmenite concentrate is beneficial to accelerate the subsequent reduction process in two *** stages of the reduction process were divided via the first derivatives of reduction degree,and the reduction mechanism and apparent activation energy were discussed subsequently.

关键词： Ilmenite Pre-oxidation Reduction Kinetic Titanium slag

Aggregate Engineering in Supramolecular Polymers via Extensive Non-covalent Networks

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Chinese Journal of Polymer Science 2021年第10期39卷 1310-1318,I0007页

作者： Xin Huang dong lv Li-Qing Ai Shuk Han Cheng Xi Yao Department of Biomedical Sciences City University of Hong KongHong Kong 999077China City University of Hong Kong Shenzhen Research InstituteShenzhen 518075China

Aggregate engineering of non-covalent networks endows supramolecular polymers with thermo-mechanical versatility,stimuli-responsive phase transitions and intrinsic damage-healing ***,most non-covalent networks are vulnerable at elevated temperatures,which suppresses the robustness of supramolecular ***,ureidocytosine(UCy)motifs,which are capable of forming extensive non-covalent networks and thus robust molecular aggregates via multivalent hydrogen bonds and aromatic stackings,are proposed to enable precise programming of the thermo-mechanical *** simulations reveal that the enthalpic contributions from the UCy aggregates play dominant roles to compensate the entropic loss from the redistributions of polymeric spacers and stabilize the non-covalent networks over wide temperature *** aggregate-level strategy offers prospects for applications which require thermo-mechanical versatility of supramolecular polymers,such as 3D printing,microfabrication and damage-healing coating.

关键词： Aggregate engineering Damage-healing Extensive non-covalent network Ureidocytosine Supramolecular polymers

Effect of Y_(2)O_(3)doping on preparation ultrafine/nano-tungsten powder and refinement mechanism

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Tungsten 2023年第4期5卷 539-547页

作者： dong-dong lv Yu Sun Jian-Bo Zhang Sheng-Da Guo Bai-Xiong Liu Faculty of Materials Metallurgy and Chemistry Jiangxi University of Science and TechnologyGanzhou341000China Jiangxi Advanced Copper Industry Research Institute Yingtan335000China Naional Rare Earh Functional Material Innovation Center Jiangxi Universiy of Science and TechnologyGanzhou341000China Engineering Research Center of Tungsten Resources High-Efficiency Development and Application Technology of the Ministry of Education Jiangxi University of Science and TechnologyGanzhou341000China

In this study,ultrafine/nano W-Y_(2)O_(3)composite powders were synthesized by spray drying,roasting and two-step hydrogen reduction using ammonium metatungstate and yttrium nitrate as raw *** mechanism of the influence of Y_(2)O_(3)on the growth of WO_(2.72)and the particle refinement of tungsten powder is *** effect of Y_(2)O_(3)particles on the reduction behavior of tungsten powder was investigated using scanning electron microscopy to study the near surface morphology and X-ray diffraction for phase ID(composition)and crystal structural changes for the reduced powders at each *** results show that the doping of 0.3 wt.%Y_(2)O_(3)can significantly increase the aspect ratio of WO_(2.72)in the first step of hydrogen ***,Y_(2)O_(3)can effectively inhibit the growth of tungsten particles in the hydrogen reduction ***,The Y_(2)O_(3)-doped tungsten powders have finer particles and a narrower particle size distribution range than the undoped *** average particle diameter of 0.3 wt.%Y_(2)O_(3)doping tungsten powder was in the range of 90-120 nm.

关键词： Tungsten powder Hydrogen reduction Yttrium oxide

Photoelectrochemical properties of BiVO4 thin films with NaOH chemical treatment

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Rare Metals 2019年第5期38卷 446-452页

作者： dong-dong lv Jiao-Feng Liu Zheng Zhang Ying-You Ma Yan Liang Zhi-Tai Zhou Wei-Chang Hao School of Physics Beihang University

BiVO4 thin films were prepared by a mature and simple electrochemical deposition method on F-doped SnO2 substrate electrode(FTO).The influence of a chemical treatment using sodium hydroxide(NaOH)on the photoelectrochemical properties of BiVO4 thin films was *** was found that NaOH can etch the crystal surface of BiVO4,which leads to the increase in specific surface area and improved photoelectrochemical *** photocurrent density of the BiVO4 thin films showed an enhancement of photoelectronic current from 0.50 to0.65 mAácm-2 at 1.23 V(***)after the treatment for5 h by NaOH,which supplies a stronger potential for H2 O oxidation.

关键词： BiVO4 Photoelectrochemical Surface treatment NaOH

Isoselective Ring-opening Polymerization of Racemic Lactide Catalyzed by N-heterocyclic Olefin/(Thio)urea Organocatalysts

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Chinese Journal of Polymer Science 2021年第6期39卷 709-715,I0006页

作者： Zhen-Yu Wang Guang-Qiang Xu Li Zhou Cheng-dong lv Ru-Lin Yang Bing-Zhe dong Qing-Gang Wang Key Laboratory of Biobased Materials Qingdao Institute of Bioenergy and Bioprocess TechnologyChinese Academy of SciencesQingdao 266101China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

The isoselective ring-opening polymerization of racemic lactide was achieved by combining N-heterocyclic olefin(NHO)with mono(thio)ureas or bis(thio)ureas as catalytic *** polymerization process shows high stereoselectivity,controllability and reactivity,delivering multi-block isotactic polylactides with high chain-end fidelity and narrow molecular weight *** enhancement of catalytic performance was observed in the following order:bisthiourea(DTU)

关键词： mechanism. heterocyclic polymerization

One-dimensional Janus Polymeric Vehicles

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Chinese Journal of Polymer Science 2015年第9期33卷 1344-1350页

作者： dong-mei lv Wei Ni 梁福鑫 Qian Wang Xiao-zhong Qu 杨振忠 State Key Laboratory of Polymer Physics and Chemistry Institute of Chemistry Chinese Academy of Sciences

We herein report a novel approach to fabricate poly（DVB-co-VBC） one-dimentional nanomaterials with varied composition. By adjusting the monomer DVB/VBC ratio and using inert solvents, after internal cavity of the nanotubes disappears and length of the nanotubes is decreased, thus nanorods are achieved. After quaternary ammoniation from the benzyl chloride group, the exterior surface becomes hydrophilic while the interiority preserves hydrophobic. The Janus nanorods can serve as a specific vehicle to selectively collect oils from their aqueous surroundings.

关键词： Poly(DVB-co-VBC) Janus Nanotube Nanorod.

Face Detection under Complex Background and Illumination

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Journal of Electronic Science and Technology 2015年第1期13卷 78-82页

作者： Shao-dong lv Yong-Duan Song Mei Xu Cong-Ying Huang School of Energy Science and Engineering University of Electronic Science and Technology

For face detection under complex background and illumination, a detection method that combines the skin color segmentation and cost-sensitive Adaboost algorithm is proposed in this paper. First, by using the characteristic of human skin color clustering in the color space, the skin color area in YC b C r color space is extracted and a large number of irrelevant backgrounds are excluded; then for remedying the deficiencies of Adaboost algorithm, the cost-sensitive function is introduced into the Adaboost algorithm; finally the skin color segmentation and cost-sensitive Adaboost algorithm are combined for the face detection. Experimental results show that the proposed detection method has a higher detection rate and detection speed, which can more adapt to the actual field environment.

关键词： Adaboost cost-sensitive learning face detection skin color segmentation

Single droplet formation by controlling the viscoelasticity of polymer solutions during inkjet printing

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Chinese Chemical Letters 2024年第6期35卷 244-248页

作者： dong lv Xuelei Liu Wei Li Qiang Zhang Xinhong Yu Yanchun Han State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China School of Applied Chemistry and Engineering University of Science and Technology of ChinaHefei 230026China

Inkjet printing has emerged as a potential solution processing method for large-area patterned *** inkjet printing,a single droplet without satellite droplet is required for high-quality ***,we propose a strategy for obtaining a single droplet by adjusting the reduced concentration(c/c^(*),where c^(*)is the critical overlap concentration)in the range of *** formation can be categorized into three distinct regimes:(1)c/c^(*)2.0,no ***,an inertial-capillary balance led to the 2/3-power scaling of the minimum radius with time for the solutions of c/c^(*)lvents.

关键词： Inkjet printing Single droplet Satellite droplet Viscoelasticity Coil-stretch

A semi-custom design methodology for design performance optimization

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第4期9卷 510-516页

作者： dong-ming lv Pei-yong ZHANG Dan-dan ZHENG Xiao-lang YAN Bo ZHANG Li QUAN Institute of VLSI Design Zhejiang University Hangzhou 310027 China

We present a semi-custom design methodology based on transistor tuning to optimize the design performance. Compared with other transistor tuning approaches, our tuning process takes the cross-talk effect into account and prominently reduces the complexity for circuit simulation and analysis by decomposing the circuit network utilizing graph theory. Furthermore, the incremental placement and routing for the corresponding transistor tuning in conventional approaches is not required in our methodology, which might induce timing graph variation and additional iterations for design convergence. This methodology combines the flexible automated circuit tuning and physical design tools to provide more opportunities for design optimization throughout the design cycle.

关键词： Transistor tuning Cross-talk Circuit decomposing