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Modes of grain growth and mechanism of dislocation reaction under applied biaxial strain:Atomistic and continuum modeling

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Journal of Materials Science & Technology 2020年第14期47卷 236-250页

作者： Ying-Jun Gao Qian-Qian Deng Zhe-yuan Liu zong-ji huang Yi-Xuan Li Zhi-Rong Luo Guangxi Advanced Key Laboratory of Novel Energy Materials Guangxi Key Laboratory for the Relativistic AstrophysicsSchool of Physics Science and EngineeringGuangxi UniversityNanning530004China Institute of Physics Science and Engineering Technology Yulin Normal UniversityYulin537000China

The phase field crystal method and Continuum Modeling are applied to study the cooperative dislocation motion of the grain boundary(GB)migration,the manner of the nucleation of the grain and of the grain growth in two dimensions(2 D)under the deviatoric deformation at high *** types of the nucleation modes of new finding are observed by the phase field crystal simulation:The first mode of the nucleation is generated by the GB splitting into two sub-GBs;the second mode is of the reaction of the sub-GB dislocations,such as,the generation and annihilation of a pair of partial Frank sessile dislocation in 2 *** process can be considered as the nucleation of dynamic recrystallization;the third mode is caused by two oncoming rows of the dislocations of these sub-GBs,crossing and passing each other to form new gap which is the nucleation place of the new deformed *** research is shown that due to the nucleation of different modes the mechanism of the grain growth by means of the sub-GB migration is different,and therefore,the grain growth rates are also *** the deviatoric deformation of the applied biaxial strain,the grain growth is faster than that of the grain growth without external applied *** is observed that the cooperative dislocation motion of the GB migration under the deviatoric deformation accompanies with local plastic flow and the state of the stress of the system changes *** the system is in the process of recrystallized grain growth,the system energy is in an unstable state due to the release of the strain energy to cause that the reverse movement of the plastic flow *** area growth of the deformed grain is approximately proportional to the strain square and also to the time *** rule of the time square of the deformed grain growth can also be deduced by establishing the continuum dynamic equation of the biaxial strain-driven migration of the *** copper metal is taken as an example of the calcu

关键词： Grain boundary splitting Grain growth Dislocation reaction Atomistic simulation Continuum modeling

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Long-Term Application of Organic Manure and Mineral Fertilizer on N_2O and CO_2 Emissions in a Red Soil from Cultivated Maize-Wheat Rotation in China

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Agricultural Sciences in China 2011年第11期10卷 1748-1757页

作者： ZHAI Li-mei L1U Hong-bin ZHANG ji-zong huang jing WANG Bo-ren Key Laboratory of Nonpoint Pollution Control Ministry of Agriculture~Institute of Agricultural Resources and Regional Planning ChineseAcademy of Agricultural Sciences Beijing 100081 P.R.China

A long-term field experiment was established to determine the influence of mineral fertilizer and organic manure on soil fertility. A tract of red soil （Ferralic Cambisol） in Qiyang Red Soil Experimental Station （Qiyang County, Hunan Province, China） was fertilized beginning in 1990 and N20 and CO2 were examined during the maize and wheat growth season of 2007-2008. The study involved five treatments： organic manure （NPKM）, fertilizer NPK （NPK）, fertilizer NP （NP）, fertilizer NK （NK）, and control （CK）. Manured soils had higher crop biomass, organic C, and pH than soils receiving the various mineralized fertilizers indicating that long-term application of manures could efficiently prevent red soil acidification and increase crop productivity. The application of manures and fertilizers at a rate of 300 kg N ha-1 yr-1 obviously increased NzO and CO2 emissions from 0.58 kg N20-N ha-~ yr-~ and 10565 kg C ha-~ yr-~ in the CK treatment soil to 3.0l kg N20-N ha-~ yr-~ and 28 663 kg C ha-~ yr-I in the NPKM treatment. There were also obvious different effects on N20 and CO2 emissions between applying fertilizer and manure. More N20 and CO2 released during the 184-d maize growing season than the 125- d wheat growth season in the manure fertilized soils but not in mineral fertilizer treatments. N20 emission was significantly affected by soil moisture only during the wheat growing season, and CO2 emission was affected by soil temperature only in CK and NP treatment during the wheat and maize growing season. In sum, this study indicates the application of organic manure may be a preferred strategy for maintaining red emissions than treatments only with mineral fertilizer. soil productivity, but may result in greater N20 and CO2

关键词： red soil N fertilizer organic manure temperature WFPS

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Structural transformation and energy analysis for pile-up dislocations at triple junction of grain boundary

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Transactions of Nonferrous Metals Society of China 2022年第1期32卷 45-63页

作者： Ying-jun GAO zong-ji huang Qian-qian DENG Kun LIAO Yi-xuan LI Xiao-Ai YI Zhi-rong LUO Guangxi Key Laboratory of Advanced Energy Materials Guangxi Key Laboratory for the Relativistic AstrophysicsSchool of Physics Science and EngineeringGuangxi UniversityNanning 530004China School of Physics and Telecommunication Engineering Yulin Normal UniversityYulin 537000China

An energy model for the structure transformation of pile-ups of grain boundary dislocations(GBD)at the triple-junction of the grain boundary of ultrafine-grain materials was *** energy of the pile-up of the GBD in the system was calculated by the energy model,the critical geometric and mechanical conditions for the structure transformation of head dislocation of the pile-up were analyzed,and the influence of the number density of the dislocations and the angle between Burgers vectors of two decomposed dislocations on the transformation mode of head dislocation was *** results show when the GBD is accumulated at triple junction,the head dislocation of the GBD is decomposed into two Burgers vectors of these dislocations unless the angle between the two vectors is less than 90°,and the increase of applied external stress can reduce the energy barrier of the dislocation *** mechanism that the ultrafine-grained metal material has both high strength and plasticity owing to the structure transformation of the pile-up of the GBD at the triple junction of the grain boundary is revealed.

关键词： triple junction of grain boundary dislocation pile-up dislocation structural transformation energy model for pile-up ultrafine-grain materials

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Surface micro-arrays enhancing electromagnetic interference shielding of polydimethylsiloxane/multiwalled carbon nanotubes nanocomposites

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Nano Research 2025年第1期18卷 508-519页

作者： Ke jiang Zhi Chen ji Yu Chen Zheng Shan huang Ming Wang Chongqing Key Laboratory of Soft-Matter Material Manufacturing School of Chemistry and Chemical EngineeringSouthwest UniversityChongqing 400715China School of Mechanics Civil Engineering and ArchitecturesNorthwestern Polytechnical UniversityXi’an 710072China jieyang Branch of Chemistry and Chemical Engineering Guangdong Laboratory(Rongjiang Laboratory) Jieyang 515200China

Herein,the electromagnetic shielding performance of surface concave-convex(SC)and zig-zag micro-arrays was studied by using a simulation prediction and a three-dimensional(3D)printing custom ***,surface stripe concaveconvex(SSC)and surface cylindrical concave-convex(SCC)micro-arrays with or without zig-zag micro-arrays are designed,and their shielding performance is simulated in multi-bands(C-,X-band).The multiwalled carbon nanotubes/polydimethylsiloxane composites(MWCNT/PDMS)with different SC structures and different electrical conductivity are molded in acrylonitrile-butadiene-styrene copolymer(ABS)molds which are printed by a 3D *** results show that the electromagnetic interference shielding effectiveness(EMI SE)of the samples can be enhanced by constructing the SC micro-arrays with zig-zag micro-arrays,and improving with the increase of conductivity and *** addition,the shielding mechanism of the SC-MWCNT/PDMS composites is investigated and discussed by an electromagnetic simulation.

关键词： surface micro-arrays electrical properties electromagnetic interference(EMI)shielding three-dimensional(3D)printing

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Role of nutrition in diabetes mellitus and infections

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World Journal of Clinical Cases 2025年第3期13卷 1-8页

作者： Xue-Lu Yu Li-Yun Zhou Xiao huang Xin-Yue Li Ming-Ke Wang ji-Shun Yang Naval Medical Center of PLA Naval Medical UniversityShanghai 200052China

In this editorial,we have commented on the article that has been published in the recent issue of World Journal of Clinical *** authors have described a case of unilateral thyroid cyst and have opined that the acute onset of infection may be linked to diabetes mellitus(DM).We have focused on the role of nutrition in the association between DM and *** with DM are at a high risk of infection,which could also be attributed to nutrition-related *** interventions for patients with diabetes are mainly based on a low-calorie diet,which can be achieved by adhering to a low-carbohydrate ***,dietary fiber supplementation is recommended to maintain the diversity of the gut ***,high-quality protein can prevent the increased risk of infection due to *** of vitamins C,vitamins A,vitamins D,and folic acid improves blood sugar control and facilitates immune *** deficiencies augment the risk of infection,but the relationship with diabetes is mostly U-shaped and a good intake should be maintained.

关键词： Diabetes mellitus Infection Macronutrients Vitamins Minerals

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In Situ TiC/FeCrNiCu High-Entropy Alloy Matrix Composites:Reaction Mechanism,Microstructure and Mechanical Properties

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Acta Metallurgica Sinica(English Letters) 2020年第8期33卷 1091-1102页

作者： Hao Wu Si-Rui huang Cheng-Yan Zhu ji-Feng Zhang He-Guo Zhu zong-Han Xie College of Materials Science and Engineering Nanjing University of Science and TechnologyNanjing 210094China School of Mechanical Engineering University of AdelaideSA 5005Australia School of Engineering Edith Cowan UniversityJoondalupWA 6027Australia

In situ TiC particles-reinforced FeCrNiCu high-entropy alloy matrix composites were prepared by vacuum induction melting *** reaction mechanisms of the mixed powder(Ti,Cu and C)were analyzed,and the mechanical properties of resultant composites were ***4Tiwere formed in the reaction of Cu and Ti when the temperature rose to 1160 *** the temperature further increased to 1182 K,newly formed Cu4Tireacted with C to give rise to TiC particles as reinforcement *** apparent activation energy for these two reactions was calculated to be 578.7 kJ/mol and 1443.2 kJ/mol,*** hardness,tensile yield strength and ultimate tensile strength of the 15 vol%TiC/FeCrNiCu composite are 797.3 HV,605.1 MPa and 769.2 MPa,respectively,representing an increase by 126.9%,65.9%and 36.0%as compared to the FeCrNiCu high-entropy base alloy at room ***,the elongation-to-failure is reduced from 21.5 to 6.1%with the formation of TiC *** was revealed that Orowan mechanism,dislocation strengthening and load-bearing effect are key factors responsible for a marked increase in the hardness and strength of the high-entropy alloy matrix composites.

关键词： High-entropy alloy matrix composite TiC particle Reaction mechanism Mechanical properties Strengthening mechanism

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DR-model-based estimation algorithm for NCS

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Frontiers of Electrical and Electronic Engineering in China 2006年第2期1卷 223-227页

作者： huang Si-niu CHEN zong-ji WEI Chen Depment of Automatic Control Beijing University of Aeronautics and AstronauticsBeijing 100083China

A novel estimation scheme based on dead reckoning(DR)model for networked control system(NCS)is proposed in this *** the detailed DR estimation algorithm and the stability analysis of the system are *** using DR estimation of the state,the effect of communication delays is *** makes a controller designed without considering delays still applicable in ***,the scheme can effectively solve the problem of data packet loss or timeout.

关键词： Networked control system(NCS) Time-delay Time synchronization Dead reckoning(DR)

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Early warning model for slope debris flow initiation

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Journal of Mountain Science 2018年第6期15卷 1342-1353页

作者： LI Ming-li jiANG Yuan-jun YANG Tao huang Qiang-bing QIAO jian-ping YANG zong-ji Key Laboratory of Mountain Hazards and Earth Surface Process of Chinese Academy of Sciences Institute of Mountain Hazards and EnvironmentChinese Academy of SciencesChengdu 610041China University of Chinese Academy of Sciences Beijing 100049China Chengdu Center of Hydrogeology and Engineering Geology of Sichuan Bureau of Geology&Mineral Resources Chengdu 610000China Department of Geological Engineering Chang'an UniversityXi'an 710054China

Early warning model of debris flow is important for providing local residents with reliable and accurate warning information to escape from debris flow hazards. This research studied the debris flow initiation in the Yindongzi gully in Dujiangyan City, Sichuan province, China with scaled-down model experiments. We set rainfall intensity and slope angle as dominating parameters and carried out 20 scaled-down model tests under artificial rainfall conditions. The experiments set four slope angles(32°, 34°, 37°, 42°) and five rainfall intensities(60 mm/h, 90 mm/h, 120 mm/h, 150 mm/h, and 180 mm/h) treatments. The characteristic variables in the experiments, such as, rainfall duration, pore water pressure, moisture content, surface inclination, and volume were monitored. The experimental results revealed the failure mode of loose slope material and the process of slope debris flow initiation, as well as the relationship between the surface deformation and the physical parameters of experimental model. A traditional rainfall intensity-duration early warning model(I-D model) was firstly established by using a mathematical regression analysis, and it was then improved into ISD model and ISM model(Here, I is rainfall Intensity, S is Slope angle, D is rainfall Duration, and M is Moisture content). The warning model can provide reliable early warning of slope debris flow initiation.

关键词： Slope debris flow Artificial rainfallmodel Early warning model Model experiment

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Cast-rolling force model of multi-roll solid–liquid cast-rolling bonding process for fabricating metal cladding materials

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Chinese Journal of Aeronautics 2023年第9期36卷 346-368页

作者： Ce ji Huagui huang College of Mechanical and Vehicle Engineering Taiyuan University of TechnologyTaiyuan 030024China Engineering Research Center of Advanced Metal Composites Forming Technology and Equipment of Ministry of Education Taiyuan University of TechnologyTaiyuan 030024China National Key Laboratory of Metal Forming Technology and Heavy Equipment Taiyuan University of TechnologyTaiyuan 030024China College of Mechanical Engineering Yanshan UniversityQinhuangdao 066004China National Engineering Research Center for Equipment and Technology of Cold Strip Rolling Yanshan UniversityQinhuangdao 066004China

Based on twin-roll casting technology and multi-roll groove rolling technology,a Multi-Roll Solid-Liquid Cast-Rolling Bonding(MRSLCRB)process was proposed to fabricate Cu/steel cladding bars,which processes the advantages of short flow and ***,it is a typical 3-D thermal-fluid-mechanics coupled problem,and determining cast-rolling force is difficult during the equipment ***,the geometrical evolution of the cast-rolling area was studied,laying the foundation to establish contact boundary equations and analyze mechanical schematics and metal ***,a 3-D steady-state thermal-fluid coupled simulation model,including casting roll,substrate bar,and cladding metal,was *** Kissing Point(KP)height,average outlet temperature,and process window were predicted,and simulation results of the three-roll layout indicate that the KP distribution along the circumferential direction can be considered ***,the engineering cast-rolling force model was derived based on the differential element method and plane deformation *** accuracy was verified by the 3-D finite element model,and the influences of process layouts and technological parameters on the castrolling force were *** the indirect multi-field coupled analysis method,the temperature–pressure evolution and reasonable process window can be predicted,which provides a significant basis for guiding equipment design and improving product quality.

关键词： Cast-rolling force Kissing point Multi-field coupled Numerical simulation Solid-liquid cast-rolling bonding

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Series expansion feasibility of singular integral in method of moments

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Journal of Systems Engineering and Electronics 2014年第3期25卷 386-392页

作者： jinzu ji Peilin huang School of Aeronautic Science and Engineering Beihang University

When calculating electromagnetic scattering using method of moments （MoM）, integral of the singular term has a significant influence on the results. This paper transforms the singular surface integral to the contour integral. The integrand is expanded to Taylor series and the integral results in a closed form. The cut-off error is analyzed to show that the series converges fast and only about 2 terms can agree wel with the accurate result. The comparison of the perfect electric conductive （PEC） sphere＇s bi-static radar cross section （RCS） using MoM and the accurate method validates the feasibility in manipulating the singularity. The error due to the facet size and the cut-off terms of the series are analyzed in examples.

关键词： method of moments (MoM) singular term series cut-off error radar cross section (RCS).

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