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Thermodynamic model for deoxidation of liquid steel considering strong metal-oxygen interaction in the quasichemical model framework

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International Journal of minerals,Metallurgy and Materials 2024年第5期31卷 988-1002页

作者： yong-min Cho Youn-Bae Kang Graduate Institute of Ferrous and Eco Materials Technology Pohang University of Science and TechnologyPohangKyungbuk37673Rep.of Korea N.EX.T Hub POSCO HoldingsPohangKyungbuk37673Rep.of Korea Department of Materials Science and Engineering Pohang University of Science and TechnologyPohangKyungbuk37673Rep.of Korea

Herein,a thermodynamic model aimed at describing deoxidation equilibria in liquid steel was *** model provides explicit forms of the activity coefficient of solutes in liquid steel,eliminating the need for the minimization of internal Gibbs energy preliminarily when solving deoxidation *** elimination of internal Gibbs energy minimization is particularly advantageous during the coupling of deoxidation equilibrium calculations with computationally intensive approaches,such as computational fluid *** model enables efficient calculations through direct embedment of the explicit forms of activity coefficient in the computing *** proposed thermodynamic model was developed using a quasichemical approach with two key approximations:random mixing of metallic elements(Fe and oxidizing metal) and strong nonrandom pairing of metal and oxygen as nearest *** these approximations,the quasichemical approach yielded the activity coefficients of solutes as explicit functions of composition and temperature without requiring the minimization of internal Gibbs energy or the coupling of separate *** model was successfully applied in the calculation of deoxidation equilibria of various elements(Al,B,C,Ca,Ce,Cr,La,Mg,Mn,Nb,Si,Ti,V,and Zr).The limitations of the model arising from these assumptions were also discussed.

关键词： deoxidation equilibria thermodynamics quasichemical approach computational fluid dynamics

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A Revised Graduated Cylindrical Shell Model and its Application to a Prominence Eruption

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Research in Astronomy and Astrophysics 2023年第12期23卷 63-72页

作者： Qing-min Zhang Zhen-yong Hou Xian-yong Bai Key Laboratory of Dark Matter and Space Astronomy Purple Mountain ObservatoryNanjing 210023China Yunnan Key Laboratory of the Solar Physics and Space Science Kunming 650216China School of Earth and Space Sciences Peking UniversityBeijing 100871China National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Solar Activity and Space Weather National Space Science CenterChinese Academy of SciencesBeijing 100190China

In this paper,the well-known graduated cylindrical shell(GCS)model is slightly revised by introducing longitudinal and latitudinal deflections of prominences originating from active regions(ARs).Subsequently,it is applied to the three-dimensional(3D)reconstruction of an eruptive prominence in AR 13110,which produced an M1.7 class flare and a fast coronal mass ejection(CME)on 2022 September *** is revealed that the prominence undergoes acceleration from~246 to~708 km s^(-1).Meanwhile,the prominence experiences southward deflection by 15°±1°without longitudinal deflection,suggesting that the prominence erupts *** deflections of the prominence and associated CME are consistent,validating the results of fitting using the revised GCS ***,the true speed of the CME is calculated to be 1637±15 km s^(-1),which is~2.3 times higher than that of *** is indicative of continuing acceleration of the prominence during which flare magnetic reconnection reaches maximum beneath the erupting ***,the reconstruction using the revised GCS model could successfully track a prominence in its early phase of evolution,including acceleration and deflection.

关键词： Sun flares-Sun filaments-prominences-Sun coronal mass ejections(CMEs)

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A transient energy function for power systems including the induction motor model

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Science China(Technological Sciences) 2007年第5期50卷 575-584页

作者： min yong CHEN Lei State Key Lab of Power Systems Department of Electrical Engineering Tsinghua University Beijing 100084 China State Key Lab of Power Systems Department of Electrical Engineering Tsinghua University Beijing 100084 China

A construction method for power system transient energy function is studied in the paper, which is simple and universal, and can unify the forms of some current en- ergy functions. A transient energy function including the induction motor model is derived using the method. The unintegrable term is dealt with to get an approxi- mate energy function. Simulations in a 3-bus system and in the WSCC 4-generator system verify the validity of the proposed energy function. The function can be applied to direct transient stability analysis of multi-machine large power systems and provides a tool for analysis of the interaction between the generator angle stability and the load voltage stability.

关键词： power system stability, transient stability, energy function, direct method, induction motor

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Severe prelenticular membrane formation on the surface of a hydrophilic acrylic intraocular lens after cataract surgery in an eye with an Ahmed valve implant

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International Journal of Ophthalmology(English edition) 2015年第2期8卷 430-432页

作者： yong-Sun ahn Jin A Choi Department of Ophthalmology St. Vincent Hospital The College of Medicine Catholic University of Korea

Dear Sir,Iam yong-Sun ahn,from the Department of Ophthalmology of *** Hospital of Suwon,Kyungki-do,South *** are a common problem in eyes with a glaucoma drainage device(GDD),because tube shunt surgery increases the incidence and progression of cataracts[1].An Ahmed valve,the most commonly inserted GDD,is composed of a silicone tube connected to a flat plate sewn to the sclera,and aqueous humor flows from the

关键词： IOL Severe prelenticular membrane formation on the surface of a hydrophilic acrylic intraocular lens after cataract surgery in an eye with an Ahmed valve implant body Figure

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Ligand-controlled NiH-catalyzed regiodivergent hydroalkylation of 2-alkenylazaarenes

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Science China Chemistry 2024年第6期67卷 1935-1940页

作者： Ya-Ping Shao Zhuo-min Chi yong-min Liang State Key Laboratory of Applied Organic Chemistry School of Chemistry and Chemical EngineeringLanzhou UniversityLanzhou730000China

A nickel-hydride(Ni H)-catalyzed migratory and nonmigratory hydroalkylation reaction of 2-alkenyl azaarenes with alkyl iodines has been established through strategic modulation of N-or P-donor *** method enables the synthesis of diverseβ-orγ-branched aromatic *** mild regiodivergent protocols exhibit wide substrate scope,excellent functional tolerance,and great reaction yield with remarkable ***,deuterium labeling studies reveal Ni H-catalyzed interrupted chain-walking mode as the mechanism behind remotedβ-selective hydroalkylation reaction—an interesting phenomenon mediated through aromatic imine directing groups.

关键词： NiH regiodivergent hydroalkylation azaarenes interrupted chain-walking

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Effect of bonding interface on delamination behavior of drawn Cu/Al bar clad material

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中国有色金属学会会刊：英文版 2012年第S3期22卷 645-649页

作者： Sangmok LEE min-Geun LEE Sang-Pill LEE Geun-ahn LEE yong-Bae KIM Jong-Sup LEE Dong-Su BAE Advanced Forming Technology Center Korea Institute of Industrial Technology Department of Advanced Materials Engineering Dong-Eui University Department of Mechanical Engineering Dong-Eui University

Cu/Al bar clad material was fabricated by a drawing process and a subsequent heat *** these processes,intermetallic compounds have been formed at the interface of Cu/Al and have affected its bonding *** of Cu/Al interfaces were observed by OM,SEM and EDX Analyser in order to investigate the bonding properties of the *** to the microstructure a series of diffusion layers were observed at the interface and the thicknesses of diffusion layers have increased with aging time as a result of the diffusion *** interfaces were composed of 3-ply diffusion layers and their compositions were changed with aging time at 400 °*** compositional compounds were revealed to be η2,(θ+η2),(α+θ) intermetallic *** is evident from V-notch impact tests that the growth of the brittle diffusion layers with the increasing aging time directly influenced delamination distance between the Cu sleeve and the Al *** is suggested that the proper holding time at 400 °C for aging as post heat treatment of a drawn Cu/Al bar clad material would be within 1 h.

关键词： drawn Cu/Al bar clad material aging bonding interface intermetallic compound diffusion layer delamination

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Hybrid transmit antenna selection and maximal-ratio transmission systems

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Journal of Systems Engineering and Electronics 2007年第2期18卷 229-235页

作者： Zhu Yaolin Fang yong Wang min School of Communication and Information Engineering Shanghai Univ. Shanghai 200072P.R.China

Maximal-ratio transmission systems with transmit antenna selection is investigated. According to the order statistics of channel fiat fading coefficients, the closed-form expressions axe derived for average SNR with any amount of RF chains and average BER with two RF chains, respectively. The algorithm for calculating the minimum of total transmit antennas is presented in terms of reduced RF chains. The method of quantizing transmit precoders is employed in this study to decrease feedback information. Simulation results demonstrate the superiority of the proposed systems under full and quantized transmit precoders. The SNR of the proposed systems has been less degraded by the quantization of transmit precoder than that of pure maximal-ratio transmission systems.

关键词： Maximal-ratio transmission transmit antenna selection Lloyd quantization.

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Compressed sensing based channel estimation for fast fading OFDM systems

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Journal of Systems Engineering and Electronics 2010年第4期21卷 550-556页

作者： Xiaoping Zhou yong Fang min Wang Key Laboratory of Specialty Fiber Optics and Optical Access Networks School of Communication and Information Engineering Shanghai University Shanghai 200072 P. R. China Key Laboratory of Advanced Display and System Applications Shanghai 200072 P. R. China

A compressed sensing（CS） based channel estimation algorithm is proposed by using the delay-Doppler sparsity of the fast fading channel.A compressive basis expansion channel model with sparsity in both time and frequency domains is *** pilots in accordance with a novel random pilot matrix in both time and frequency domains are sent to measure the delay-Doppler sparsity *** relatively nonzero channel coefficients are tracked by random pilots at a sampling rate significantly below the Nyquist *** sparsity channels are estimated from a very limited number of channel measurements by the basis pursuit *** proposed algorithm can effectively improve the channel estimation performance when the number of pilot symbols is reduced with improvement of throughput efficiency.

关键词： compressed sensing sparse channel channel estimation fast fading.

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BUILDING FOR THE FUTURE:UNITED NATIONS APPROACH FOR THEIR BUILDINGS

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Journal of Green Building 2011年第4期6卷 1-6页

作者： yong Han ahn Department of Construction Management at East Carolina University

INTRODUCTION The term“Sustainable Development”was first used in the Brundtland Report from the United Nations World Commission on Environment Development(WCED)in *** this report,sustainable development was defined as“development that meets the needs of the present without compromising the ability of future generations to meet their own needs.”

关键词： Sustainable sustainable BUILDING

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Five Consecutive Positive Odd Numbers None of Which Can Be Expressed as a Sum of Two Prime Powers Ⅱ

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Acta Mathematica Sinica,English Series 2008年第11期24卷 1883-1890页

作者： yong Gao CHEN min TANG Department of Mathematics Nanjing Normal University Nanjing 210097 P. R. China Department of Mathematics Anhui Normal University Wuhu 241000 P. R. China

In this paper, we find two integers k0, m of 159 decimal digits such that if k ≡ k0 （mod m）, then none of five consecutive odd numbers k, k - 2, k - 4, k - 6 and k - 8 can be expressed in the form 2^n ± p^α, wher... 详细信息

关键词： Erdos problems covering systems odd numbers sums of prime powers

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