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Reoxidation process and corrosion behavior of TA15 alloy by laser ablation

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Rare Metals 2021年第4期40卷 865-876页

作者： Bo-Wen liu gao-Yang Mi chun-Ming Wang School of Materials Science and Engineering Huazhong University of Science and TechnologyWuhan 430074China

The thermal oxide layer formed of TA15 alloy has poor corrosion *** this paper,the changes of the elements and components on the surface after laser ablation with different energy densities(E) were *** formation process and corrosion behavior of laser-generated oxide layer were *** E increases,the oxygen content decreases from 8.52% to 5.43% and then increases to 11.89%.The surface oxide layer changes from TiO_(2)(R)(i.e.,rutile) to Ti_(2) O_(3)+TiO_(2)(R) and finally becomes TiO_(2)(R)+TiO_(2)(A)(i.e.,anatase).The TiO_(2)(R) gasification was confirmed by calculating the surface temperature *** surface reoxidation process was illustrated by a thermodynamically calculated ΔgT(i.e.,the gibbs free energy changes with temperature).When E≥17.5 J·cm^(-2),the oxide layer exhibits an agitated morphology,and oxide falls off at the *** E increases,the corrosion rate decreases first and then *** energy density of 8.75 J·cm^(-2),the surface corrosion rate was 20.43 times slower than that of the untreated *** impedance spectrum and equivalent resistance results also prove the best corrosion resistance at 8.75 J·cm^(-2).The corrosion behavior of the oxide layer is analyzed from the properties of the oxide layer components and the reaction products with the electrolyte.

关键词： Laser ablation TA15 alloy Reoxidation process Corrosion behavior Elemental analysis

feature analysis on US military aircraft engine advanced technology programs

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航空动力学报 2014年第7期29卷 1701-1709页

作者： LIANg chun-hua SUN Ming-xia liu Hong-xia Shenyang Engine Design and Research Institute Aviation Industry Corporation of China

US military aircraft engine advanced technology programs were overviewed and analyzed from light weight gas generator(LWgg)program initiated in 1960 sthrough integrated high performance turbine engine technology(IHPTET)program started in 1980 s,then to versatile affordable advanced turbine engine(VAATE)*** features and trends were summarized and concluded by literature statistics method,such as teams based on closely corporation among government,industries and academics,goals oriented with national defence strategies and weapon system development requirements,engineering manufacture and development including all relative disciplines and areas,verification measured by technology readiness level,the application extending to military aircraft engine,civilian engine,gas turbine and space vehicle,*** experience and lessons obtained can provide reference and guide for technology research and engineering manufacture and development of military aircraft engines in the world.

关键词： aircraft engine military aircraft engine advanced technology program technology corporation multi-discipline development technology verification

Dissolution characteristics of black aluminum dross in Na_(3)AIF_(6)-AIF_(3)-Al_(2)O_(3)molten salt system

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Rare Metals 2023年第8期42卷 2747-2756页

作者： Zheng-Ping Zuo guo-Qing Yu chun-Li liu gui-Cheng liu fe.g-Qin liu State Key Laboratory of Advanced Metallurgy School of Metallurgical and Ecological EngineeringUniversity of Science and Technology BeijingBeijing 100083China Research Center Heavy Machinery Ministry of Education Taiyuan University of Science and TechnologyTaiyuan 030024China Department of Physics and Oxide Research Center Hankuk University of Foreign StudiesYongin 17035Republic of Korea School of Energy Power and Mechanical Engineering North China Electric Power UniversityBeijing 102206China Department of Physics Dongguk UniversitySeoul 04620Korea

The dissolution performance of black aluminum dross(BAD)in cryolite electrolyte is key to its recovery by molten salt *** stable operation of the electrolyzer depends mainly on the rapid dissolution of BAD in Na_(3)AlF_(6)-AlF_(3)-Al_(2)O_(3)electrolyte *** this paper,the dissolution performance and behavior of BAD and its main components in the cryolite system were studied,and the saturation solubility of aluminum nitride in this system was *** dissolution performance of BAD in cryolite electrolyte before and after denitration was compared,and the effects of temperature,cryolite ratio,and the doping ratio of BAD and alumina on the dissolution rate were *** obtained results showed that aluminum nitride was the main factor affecting the dissolution performance of BAD in the *** nitride was partly converted toα-Al_(2)O_(3)after addition to the electrolyte,and the convertedα-Al_(2)O_(3)was partially dissolved in the cryolite electrolyte,while the remaining precipitated and accumulated at the bottom with aluminum *** nitride was almost insoluble in the cryolite electrolyte,with 0.0022%solubility.A higher proportion ofα-Al_(2)O_(3)in BAD was negatively influenced its solubility in the cryolite *** dissolution rate of BAD in cryolite electrolytes was effectively improved by mixing BAD withγ-Al_(2)O_(3).

关键词： Aluminum dross Aluminum nitride Kinetics Hydrolysis Dissolution rate

The Natural Imagery in the Zhuangzh A Preliminary Study

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Frontiers of Literary Studies in China-Selected Publications from Chinese Universities 2013年第1期7卷 65-86页

作者： chun liu Department of English Peking University Beijing 100871 China

This essay presents a preliminary examination of the use of natural imagery in the Inner Chapters of the Zhuangzi. The essay analyzes the characteristics of this imagery and the possible reasons for Zhuangzi＇s particular use of fantastic language, exaggeration, and fiction in connection with natural images. In doing so, I also compare the Zhuangzi with several important classical Chinese and greek texts. In addition, I explore the possible motivations for and influence exerted by Zhuangzi＇s use of natural imagery. The essay aims to demonstrate that an analysis of the roles played by natural imagery in the Zhuangzi contributes significantly to our understanding of the work as a whole, as well as its abiding influence on later works.

关键词： the Zhuangzi natural images Chu culture transformation exaggeration allegory

Evolution of fermion resonance in thick brane

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Communications in Theoretical Physics 2024年第12期76卷 129-139页

作者： chun-chun Zhu Qin Tan Yu-Peng Zhang Yu-Xiao liu Institute of Theoretical Physics & Research Center of gravitation Lanzhou University Key Laboratory of Quantum Theory and Applications of Mo E Lanzhou University Lanzhou Center for Theoretical Physics & Key Laboratory of Theoretical Physics of gansu Province Lanzhou University

In this work, we investigate the numerical evolution of massive Kaluza–Klein(KK) modes of a Dirac field on a thick brane. We deduce the Dirac equation in five-dimensional spacetime, and obtain the time-dependent evolution equation and Schr?dinger-like equation of the extradimensional component. We use the Dirac KK resonances as the initial data and study the corresponding dynamics. By monitoring the decay law of the left-and right-chiral KK resonances, we compute the corresponding lifetimes and find that there could exist long-lived KK modes on the brane. Especially, for the lightest KK resonance with a large coupling parameter and a large three momentum, it will have an extremely long lifetime.

关键词： braneworld dynamic evolution fermion resonance

STUDY ON SAMPLINg INSPECTION SCHEME TO DIgITAL PRODUCTS IN gIS

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geo-Spatial Information Science 2001年第1期4卷 62-67页

作者： liu chun Dept. of Surveying and geoinforrnatics Tongii University

Adopting a principle of “check_accept for the first rank,inspection for the second rank”,this paper briefly discusses the rationale of the sampling inspection and the sampling inspection schemes to digital products in *** OC curve is drawn to explain the deficiency of the percent sampling ***,the method of One Time Limiting Quality of count selection is presented as the inspection scheme for production departments while the method of One Time After_inspection Mean Percent Defective Upper Limit of count selection is for acceptance departments.

关键词： sampling inspection digital products gIS

Determination of gossypol in Trace Level by Flow Injection Analysis with Chemiluminescence Detection

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Chinese Chemical Letters 2006年第1期17卷 57-60页

作者： Bing chun XUE Er Bao liu College of Chemistry and Life Sciences Tianjin Normal University Tianjin 300074

This work reports the single-molecule detection of gossypol by flow injection analysis with chemiluminescence method. The method is based on the reaction of luminol with ferricyanid in sodium hydroxide medium sensitized by gossypol. Under the optimum conditions, the CL intensity is proportional to the concentration of gossypol over the range of 1.11×10^-17-2.78×10^-16 mol/L in acid solution and 8.00×10^-11-7.39×10^-8mol/L in neutral solution with correlation coefficients 0.9983 and 0.9905, respectively. The detection limits is 1.60×10^-18 mol/L （S/N=3）. The proposed method has been applied for the determination of the gossypol in cottonseeds and pharmaceutical formulations with satisfactory results.

关键词： Single-molecule detection chemiluminescence flow injection gossypol.

MatDEM-fast matrix computing of the discrete element method

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Earthquake Research Advances 2021年第3期1卷 1-7页

作者： chun liu Hui liu Hongyong Zhang School of Earth Sciences and Engineering Nanjing UniversityNanjing210023China

Discrete element method can effectively simulate the discontinuity,inhomogeneity and large deformation and failure of rock and *** on the innovative matrix computing of the discrete element method,the highperformance discrete element software MatDEM may handle millions of elements in one computer,and enables the discrete element simulation at the engineering *** supports heat calculation,multi-field and fluidsolid coupling numerical ***,the software integrates pre-processing,solver,postprocessing,and powerful secondary development,allowing recompiling new discrete element *** basic principles of the DEM,the implement and development of the MatDEM software,and its applications are introduced in this *** software and sample source code are available online(http://***).

关键词： Discrete element method High-performance MatDEM Matrix computing

Protein dynamics elucidated by NMR technique

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Protein & Cell 2013年第10期4卷 726-730页

作者： Conggang Li chun Tang Maili liu Key Laboratory of Magnetic Resonance in Biological Systems Wuhan Center for Magnetic ResonanceState Key Laboratory of Magnetic Resonance and Atomic and Molecular PhysicsWuhan Institute of Physics and MathematicsChinese Academy of SciencesWuhan 430071China

In 1957,Christian Anfinsen postulated his famous dogma based on the study of ribonuclease(Sela et al.,1957),stating that the amino acid sequence of a protein determines its tertiary structure,a unique and kinetically accessible energy minimum,in a given *** a result,determination of a global energy minimum,or the most populated structure,has been the main focus of structural biology in the ensuing half a *** more and more structures have been determined,people have gain some insights of why protein functions,but the detailed mechanisms and the function process,or how protein functions,remains elusive.

关键词： elucidated structure dynamics