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Transient process of methane-oxygen diffusion flame-street establishment in a microchannel

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Frontiers in Energy 2022年第6期16卷 988-999页

作者： Xin kang Yu WANG School of Civil Engineering and Architecture Wuhan University of TechnologyWuhan 430070China School of Automotive Engineering Wuhan University of TechnologyWuhan 430070China

“Flame-street”is an interesting diffusion flame behavior in which a series of flame-segments is separately distributed along the mixing layer in a narrow *** experimental phenomenon was experimentally and numerically investigated with the focus on the steady-state,thermo-chemical flame structures in previous *** the present paper,the dynamic formation process of a methane-oxygen diffusion flame-street structure was simulated with a reacting flow solver developed based on the open-source framework *** imposing a certain amount of ignition-energy near the channel outlet,a reaction-kernel was formed and ***,three separate flames were consecutively generated from this kernel and propagated within the *** whole process was completed within 15 ms and all the discrete flames were eventually in a ***,different propagation features were observed for the three flame segments:The leading flame experienced a flame shape/type change from a tribrachial structure in its fastpropagating phase to a long,trailing diffusion tail after being anchored to the *** successive flame had a much lower propagation speed,keeping its two wing-like(fuel-lean premixed and fuel-rich premixed)structure while moving toward its stabilization location,which was approximately in the middle of the *** last flame,after the ignition source was turned-off,was immediately convected a bit downstream,and eventually featured a similar two-branch-like structure as the second ***,chemical insights for the premixed and diffusion branches of the leading flame were also provided with the change of significance of some key elementary reactions focused on,in order to attain a detailed profiling of the flame-type *** paper is a first-ever one discussing the transient formation of flame-streets in literature and is believed to be useful for obtaining a comprehensive understanding of this unique flame characte

关键词： micro-combustion flame-street diffusion flame mixing layer flame propagation speed

Review on fatigue life prediction models of welded joint

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Acta Mechanica Sinica 2020年第3期36卷 701-726页

作者： Guozheng kang Huiliang Luo Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province School of Mechanics and EngineeringSouthwest Jiaotong UniversityChengdu 610031China Institute of Applied Mechanics State Key Laboratory of Traction PowerSouthwest Jiaotong UniversityChengdu 610031China

Fatigue assessment of welded joint is still far from being completely solved now,since many influencing factors coexist and some important ones should be considered in the developed life prediction models ***,such influencing factors of welded joint fatigue are firstly summarized in this work;and then,the existing life prediction models are reviewed from two aspects,i.e.,uniaxial and multiaxial ones;finally,significant conclusions of existing experimental and theoretical researches and some suggestions on improving the fatigue assessment of welded joints,especially for the low-cycle fatigue with the occurrence of ratchetting,are provided.

关键词： Welded joint High-cycle fatigue Low-cycle fatigue Influencing factors Life prediction models

Combinatorial principles between RRT2 2 and RT2 2

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Frontiers of Mathematics in China 2014年第6期9卷 1309-1323页

作者： Xiaojun kang School of Philosophy and Sociology Jilin University Changchun 130012 China Institute of Logic and Cognition Sun Yat-sen University Guangzhou 510275 China

We study the strength of some combinatorial principles weaker than Ramsey theorem for pairs over RCA0. First, we prove that Rainbow Ramsey theorem for pairs does not imply Thin Set theorem for pairs. Furthermore, we get some other related results on reverse mathematics using the same method. For instance, Rainbow Ramsey theorem for pairs is strictly weaker than ErdSs- Moser theorem under RCA0.

关键词： Reverse mathematics thin set free set ErdSs-Moser theorem,Rainbow Ramsey theorem

CONTACT ALGORITHMS FOR CONTACT DYNAMICAL SYSTEMS

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Journal of Computational Mathematics 1998年第1期16卷 1-14页

作者： kang Feng 中科院计算数学与科学工程计算所北京

In this paper, we develop a general way to construct contact algorithms for contact dynamical systems. Such an algorithm requires the corresponding step transition map preserve the contact structure of the underlying contact phase space. The constructions are based on the correspondence between the contact geometry of R2n+1 and the conic symplectic one of R2n+2 and therefore, the algorithms are derived naturally from the symplectic algorithms of Hamiltonian systems.

关键词： contact algorithms contact systems conic symplectic geometry generating functions

A study on neural mechanism of face processing based on fMRI

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Progress in Natural Science:Materials International 2008年第2期18卷 201-207页

作者： kang Lee Canada Institute of Child Study University of Toronto

Recently,there were debates about the specificity of lateral middle fusiform in face processing. The debates focused on whether these areas were specialized in face processing or involved in processing of visual expertise and categorization at individual level. The present study aims to investigate the neural mechanism of face processing,using Chinese characters as comparison stimuli. Chinese characters are greatly similar to faces on a variety of dimensions,among which the most significant one is that both faces and Chinese characters not only are extremely familiar to literate Chinese adults but also are processed at individual level. In the present study,faces and Chinese characters activated bilateral middle fusiform with great correlation. Greater activities were observed in the right fusiform face area (FFA) for faces than for Chinese characters. These results demonstrate that FFA is specialized in face processing per se rather than the processing of visual expertise and categorization at individual level.

关键词： Face processing Chinese characters Fusiform gyrus fMRI

Boundless love:a German Professor Uli Schwarz in China

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Protein & Cell 2024年第8期15卷 553-558页

作者： Le kang State Key Laboratory of Integrated Management of Pest Insects and Rodents Institute of ZoologyChinese Academy of SciencesBeijing 100101China

More than 20 years ago,an old German man embarked on a quest to explore the suburbs of Shanghai and the villages of jiangsu Province in search of antique Chinese *** was not a mere antique collector or aficionado of ancient furmiture,but a German scientist motivated by his profound love of Chinese *** name was Uli Schwarz(Fig.1),a distinguished German scientist who had dedicated the majority of his life to promoting cross-cultural scientific exchanges,an effort that left an indelible mark on the landscape of research collaborations between China and Germany.

关键词： Schwarz German landscape

The applications of robust estimation method BaySAC in indoor point cloud processing

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Geo-Spatial Information Science 2016年第3期19卷 182-187页

作者： Zhizhong kang School of Land Science and Technology China University of GeosciencesBeijingChina

Based on Bayesian theory and RANSAC,this paper applies Bayesian Sampling Consensus(BaySAC)method using convergence evaluation of hypothesis models in indoor point cloud *** implement a conditional sampling method,BaySAC,to always select the minimum number of required data with the highest inlier *** the primitive parameters calculated by the different inlier sets should be convergent,this paper presents a statistical testing algorithm for a candidate model parameter histogram to compute the prior probability of each data ***,the probability update is implemented using the simplified Bayes’*** performances of the BaySAC algorithm with the proposed strategies of the prior probability determination and the RANSAC framework are compared using real *** experimental results indicate that the more outliers contain the data points,the higher computational efficiency of our proposed algorithm gains compared with *** results also indicate that the proposed statistical testing strategy can determine sound prior inlier probability free of the change of hypothesis models.

关键词： 3D indoor modeling robust estimation RANSAC BaySAC point cloud registration fitting of point cloud

Preparation and Unimolecular-Micellization Behavior of Homopolymer of Surface-Active Monomer AMC14AB

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Chinese Journal of Chemical Physics 2008年第5期21卷 469-475页

作者： kang-kai Liu Lei Li Institute of Coal Chemistry Chinese Academy of Sciences Taiyuan 030001 China Economy and Commerce Committee of Shanxi Province Taiyuan 030001 China

（2-acrylamido） ethyl tetradecyl dimethylammonium bromide （AMC14AB） was polymerized in aqueous solu- tion to form the homopolymer P（AMC14AB）. The physicochemical properties of P（AMC14AB） in aqueous solution were mainly studied with fluorescent probe method, surface tension measurement and conductom- etry. The experimental results show that the aggregation morphology of P（AMC14AB） in aqueous solution is unimolecular micelle as expected. Being different from conventional multimolecular micelle systems, the unimolecular micelle system of P（AMC14AB） not only shows critical micellar concentration （CMC=0）, （i.e. once added to pure water, the surface tension decreases immediately in spite how small the density is）, but also the surface tension stays almost the same with the concentration increasing. That is to say, there is no mutational point on the relationship curve between surface tension and concentration. Furthermore, the unimolecular micelle system of P（AMC14AB） has no Krafft temperature, i.e. at any temperature, so long as it is dissolved in water, the unimolecular micelles will form. Besides this, for the solubilization of hydrophobic organic substances, the unimolecular micelle system of P（AMC14AB） is obviously different from the common multimolecular micelle system, having no turning point on the relationship curve between toluene solubi- lizaion amount and P（AMC14AB） concentration, and the solubilizing ability of the unimolecular-micelle system of P（AMC14AB） for hydrophobic organic substances is much higher than that of the conventional multimolecular micelle solutions of common surfactants, such as centyl trimethyl ammonium bromide.

关键词： Surface active monomer Unimolecular micelle Zero critical micellar concentration Krafft temperature

Reaction coupling as a promising methodology for selective conversion of syngas into hydrocarbons beyond Fischer-Tropsch synthesis

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Science China Chemistry 2017年第11期60卷 1382-1385页

作者： kang Cheng Jincan kang Qinghong Zhang Ye Wang State Key Laboratory of Physical Chemistry of Solid Surfaces Collaborative Innovation Center of Chemistry for Energy MaterialsNational Engineering Laboratory for Green Chemical Production of AlcoholsEthers and EstersCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China

Syngas （CO/H2） is a key platform that bridges various car- bon resources （including natural gas or shale gas, coal and biomass） and liquid fuels or high-value chemicals. In addi- tion to these carbon resources, syngas can also be produced from waste and CO2. From syngas, a variety of products such as hydrocarbons, which can be either liquid fuels （gasoline, diesel fuel and jet fuel） or building-block chemicals （lower olefins and aromatics）, and oxygenates （methanol and ethanol or other C2＋ oxygenates） can be obtained. The development of efficient catalysts for the conversion ofsyngas into specific target products is the core of syngas chemistry. The selectiv- ity control is the biggest challenge in syngas chemistry.

关键词：碳氢化合物合成气转化含氧化合物联作反应液体燃料高效催化剂