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Synthesis of ZnS from organic sulfur in petroleum co.e and its photocatalysis properties

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Petroleum Science 2010年第2期7卷 268-272页

作者： Zheng Yanjun Wang Xudong Cui Lishan State Key Laboratory of Heavy Oil Processing China University of Petroleum Beijing 102249 China Department of Materials Science and Engineering China University of Petroleum Beijing 102249 China Technical Department Construction Division Offshore Oil Engineering Co. Ltd Mailbox 595 Tianjin 300452 China

Organic sulfur in high sulfur petroleum co.e was treated as the S source for synthesis of ZnS photocatalyst. Experimental results showed that with ball milling and subsequent heating treatment, ZnS co.pound co.ld be successfully synthesized and showed co.siderable photocatalysis activity for deco.posing industrial pollutants. The co.centration of methyl orange or ethylene blue may be lowered to less than 5% after being deco.posed by the synthesized-ZnS photocatalysis. Results of this study suggested a potential technique of turning high sulfur petroleum co.es from industrial wastes into useful products for environment improvement.

关键词： Petroleum co.e photocatalysis ZnS ball milling high-sulfur

Surface Integrity of Inco.el 738LC Parts Manufactured by Selective Laser Melting Followed by High-speed milling

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Chinese Journal of Mechanical Engineering 2023年第1期36卷 65-79页

作者： Guanhui Ren Sai Guo Bi Zhang Department of Mechanical and Energy Engineering Southern University of Science and TechnologyShenzhen518055China Shenzhen Key Laboratory for Additive Manufacturing of High-performance Materials Shenzhen518055China Research and Development Department Shenzhen Xinjinquan Precision Techonology Co.Ltd.Shenzhen518055China School of Mechanical Engineering Shandong UniversityJinan250061China

This study is co.cerned with the surface integrity of Inco.el 738LC parts manufactured by selective laser melting(SLM)followed by high-speed milling(HSM).In the investigation process of surface integrity,the study employs ultradepth three-dimensional microsco.y,laser scanning co.focal microsco.y,scanning electron microsco.y,electron backscatter diffractometry,and energy dispersive spectrosco.y to characterize the evolution of material microstructure,work hardening,residual stress co.pling,and anisotropic effect of the building direction on surface integrity of the *** results show that SLM/HSM hybrid manufacturing can be an effective method to obtain better surface quality with a thinner machining metamorphic ***-speed machining is adopted to reduce cutting force and suppress machining heat,which is an effective way to produce better surface mechanical properties during the SLM/HSM hybrid manufacturing *** general,high-speed milling of the SLM-built Inco.el 738LC samples offers better surface integrity,co.pared to simplex additive manufacturing or casting.

关键词： Surface integrity Inco.el 738LC Selective laser melting High-speed milling

Effect of ZrO_(2)Addition on Lanthanum Aluminate-based High Emissivity co.ting Materials

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China's Refractories 2023年第4期32卷 38-41页

作者： ZHANG Yifan WANG Gang WANG Qu LU Keke ZHANG Qi State Key Laboratory of Advanced Refractories Sinosteel Luoyang Institute of Refractories Research Co.Ltd.Luoyang 471039China co.lege of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China

In order to enhance the sintering resistance of lanthanum aluminate based high emissivity co.tings,Ca^(2+)-Fe^(3+)doped LaAlO_(3)/ZrO_(2)specimens were prepared by solid state sintering using La_(2)O_(3),Al_(2)O_(3),Caco.(3) and Fe_(2)O_(3) as raw materials,extra-adding fused Y_(2)O_(3)-stabilized ZrO_(2)(0,5%,10%,and 15%,by mass),ball milling,pre-calcining,pressing into shapes and sintering at 1600℃for 2 *** effect of the ZrO_(2)addition on the properties of lanthanum aluminate based high emissivity co.tings was *** is co.cluded that ZrO_(2)does not react with LaAlO_(3),which can inhibit the sintering of the *** the increase of the ZrO_(2),addition,the linear shrinkage rate and the thermal co.ductivity decrease significantly,while the emissivity decreases,but the emissivity of all the specimens is all higher than *** optimal addition of ZrO_(2),is 10%.

关键词： lanthanum aluminate zirco.ia sintering resistance emissivity

Effect of Microstructure of co.posite Powders on Microstructure and Properties of Microwave Sintered Alumina Matrix Ceramics

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Journal of Materials Science & Technology 2013年第5期29卷 429-433页

作者： Hanmin Bian Yong Yang You Wang Wei Tian Haifu Jiang Zhijuan Hu Weimin Yu Department of Materials Science Harbin Institute of Technology Tianjin Cement Industry Design & Research Institute co. Ltd. School of Materials Science and Engineering Hebei University of Technology China Gas Turbine Establishment National Defense Science and Technology Key Lab for Reliability and Environment Engineering Technology Beijing Institute of Spacecraft Environment Engineering

Two kinds of different structured alumina-titania co.posite powders were used to prepare alumina matrix ceramics by microwave sintering. One was powder mixture of alumina and titania at a micron-submicron level, in which fused-and-crushed alumina particles （micrometers） was clad with submicron-sized titania. The other was powder mixture of alumina and titania at nanometer-nanometer level, in which nano-sized alumina and nano-sized titania particles were homogeneously mixed by ball-milling and spray dried to prepare spherical alumina-titania co.posite powders. The effect of the microstructure of co.posite powders on microstructure and properties of microwave sintered alumina matrix ceramics were investigated. Nano-sized co.posite （NC） powder showed enhanced sintering behavior co.pared with micro-sized co.posite （MC） powders. The as- prepared NC ceramic had much denser, finer and more homogenous microstructure than MC ceramic. The mechanical properties of NC ceramic were significantly higher than that of MC ceramic, e.g. the flexural strength, Vickers hardness and fracture toughness of NC ceramic were 85.3%, 130.3% and 25.7% higher than that of MC ceramic, respectively. The improved mechanical properties of NC ceramic co.pared with that of MC ceramic were attributed to the enhanced densification and the finer and more homogeneous microstructure through the use of the nanostructured co.posite powders.

关键词： Al2O3 co.posites Microwave processing Mechanical properties

Preparation of Nb3Al superco.ductor by powder metallurgy and effect of mechanical alloying on the phase formation

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Journal of Modern Transportation 2014年第1期22卷 55-58页

作者： Zhao Liu Yongliang Chen Lupeng Du Pingyuan Li Yajing Cui Xifeng Pan Guo Yan Key Laboratory of Magnetic Levitation Technologies and Maglev Trains Ministry of Education of Chinaand Superconductivity and New Energy R&D CenterSouthwest Jiaotong University Western Superco.ducting Technologies co. Ltd.

Adoption of powder-in-tube method to fabricatesuperco.ducting wire can realize a large application ofNb3Al prepared by powder metallurgy. Powder metallurgywas used to synthesize Nb3Al under various heat-treatmentco.ditions, annealing temperature was varied from 700 to1,000 C and heating time was varied from 10 to 50 h.X-ray diffraction patterns reveal that a reaction between Nband Al took place and formed NbAl3 phase. Under currentheat-treatment co.ditions （annealing temperature wasvaried from 700 to 1,000 C and heating time was variedfrom 10 to 50 h）, NbAl3 was so stable that it did not furtherreact with the unreacted Nb and was not sensitive to theheat-treatment co.dition. By mechanical alloying, adoptionof high-energy ball milling significantly decreases particlesize and enhances surface free energy, which promotes theformation of Nb3Al phase. X-ray diffraction patternsindicate that relatively pure Nb3Al phase was obtainedunder the same heat-treatment co.dition. Energy-dispersiveX-ray analysis measurement demonstrates that theobtained samples were close to the right stoichiometry ofA15 structure Nb3Al.

关键词： Nb3Al Superco.ductivity Powdermetallurgy Mechanical alloying

Microstructure investigation of dynamic recrystallization in hard machining:From thermodynamic irreversibility perspective

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Frontiers of Mechanical Engineering 2021年第2期16卷 315-330页

作者： Binxun LI Xinzhi ZHANG Song ZHANG Key Laboratory of High Efficiency and Clean Mechanical Manufacture of Ministry of Education School of Mechanical EngineeringShandong UniversityJinan 250061China Key National Demonstration Center for Experimental Mechanical Engineering Education Shandong UniversityJinan 250061China China Unico.(Shandong)Industrial Internet co. Ltd.Jinan 250001China

The drastically changed thermal,mechanical,and chemical energies within the machined surface layer during hard machining tend to initiate microstructural *** this paper,attention is paid to the introduction of thermodynamic potential to unravel the mechanism of microstructure ***,the thermodynamic potential-based model expressed by the Helmholtz free energy was proposed for predicting the microstructure changes of serrated chip and the machined surface ***,the proposed model was implemented into a validated finite element simulation model for cutting operation as a user-defined *** addition,the predicted irreversible thermodynamic state change in the deformation zones associated with grain size,which was reduced to less than 1 mm from the initial size of 1.5 mm on the machined surface,was provided for an in-depth *** good co.sistency between the simulated results and experimental data validated the efficacy of the developed *** research helps to provide further insight into the microstructure alteration during metal cutting.

关键词： thermodynamic irreversibility Helmholtz free energy microstructure evolution dynamic recrystallization hard milling

Preparation of Ce(SO_4)_2-doped Phosphosilicate Gels by Mechanical milling

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Chemical Research in Chinese Universities 2012年第2期28卷 299-301页

作者： PENG Hui-fen HU Lin-na HE Jun-hua School of Materials Science and Engineering Hebei University of TechnologyTianjin 300130P.R.China School of Chemical Engineering Hebei University of TechnologyTianjin 300130P.R.China Chengdu Sepmem Science&Technology co. Ltd.Chengdu 610091P.R.China

Ce（SO4） 2-doped phosphosilicate gel was prepared by mechanical *** impedance analysis proved that the 15 h-ball-milled sample showed a maximum co.ductivity of 2.97 S/m at 130 °C,which is about 40% higher than that of the sol-gel-prepared sample with the same *** results proved that the ball-milled samples co.tained more Q1 structural units helpful to an increase in both proton co.duction and chemical durability.

关键词： Phosphosilicate gel Proton co.ductor Cerium sulphate Mechanical milling

Genes co.trolling grain chalkiness in rice

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The Crop Journal 2024年第4期12卷 979-991页

作者： Luo Chen Xiumei Li Minhua Zheng Rui Hu Jingfang Dong Lingyan Zhou Wuge Liu Dilin Liu Wu Yang Rice Research Institute Guangdong Academy of Agricultural SciencesGuangdong Key Laboratory of New Technology in Rice BreedingGuangdong Rice Engineering LaboratoryKey Laboratory of Genetics and Breeding of High Quality Rice in Southern China(Co-construction by Ministry and Province)Ministry of Agriculture and Rural AffairsGuangzhou 510640GuangdongChina co.lege of Agriculture and Biology Zhongkai University of Agriculture and EngineeringGuangzhou 510225GuangdongChina Guangdong Provincial Key Laboratory for Crop Germplasm Resources Preservation and Utilization Agro-biological Gene Research CenterGuangdong Academy of Agricultural SciencesGuangzhou 510640GuangdongChina

With rising living standards,there is an increasing demand for high-quality *** quality is mainly defined by milling quality,appearance quality,co.king and eating quality,and nutrition *** them,chalkiness is a key trait for appearance quality,which adversely affects co.king and eating quality,head rice yield,and co.mercial ***,chalkiness is undesirable,and reducing chalkiness is a major goal in rice quality ***,chalkiness is a co.plex trait jointly influenced by genetic and environmental factors,making its genetic study and precision improvement a huge *** the rapid development of molecular techniques,much knowledge has been gained about the genes and molecular networks involved in chalkiness *** present review describes the major environmental factors affecting chalkiness and summarizes the quantitative trait loci(QTL)associated with *** than 150 genes related to chalkiness formation have been *** functions of the genes regulating chalkiness,primarily those involved in starch synthesis,storage protein synthesis,transcription regulation,organelle development,grain shape regulation,and hightemperature response,are ***,we identify the challenges associated with genetic improvement of chalkiness and suggest potential ***,the review offers insight into the molecular dynamics of chalkiness and provides a strong basis for the future breeding of high-quality rice varieties.

关键词： Rice Grain quality Chalkiness QTL identification Gene

Experimental Research on Spontaneous co.bustion Tendency of High Volatile Blended co.ls

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Engineering（科研） 2013年第3期5卷 309-315页

作者： Jinfeng Ma Fei Shao Junrui Shi Zhijia Xue Shuqun Wang Hongtao Li Huangxin Zhang MI Ninth Design & Research Institute co. Ltd. Changchun China Shenyang Institute of Engineering Shenyang China

Experiment of oxidation characteristics with slow velocity of high volatile blended co.ls was investigated in the surroundings of low oxygen co.ditions, which gives three kinetic factors in the step of low temperature through the methods of thermo gravimetric analysis, the co.ts-Redfern integration and Achar-Brindley-Sharp-Wendworth. The results of calculation show that activation energy and pre-exponential factor increase with the reaction process, and tendency of spontaneous co.bustion of the blended co.l have changed. The experimental results show that the type of absorbing oxygen is mainly physical adsorption and calorific value is very small during increasing weight. Volatile of blended co.l releases before single co.l and co.bustion temperature of blended co.l is between one and other single co.ls. If the oxygen co.tent is below 16% in the milling system, explosion-proof effect on high volatile blended co.l can be obtained.

关键词： Thermogravimetric Analysis High Volatile Blended co.l Kinetic Theory Oxidation Characteristics