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Journal of Iron and Steel Research International 2014年第2期21卷 166-173页

作者： Jing GUO Shu-sen cheng Zi-jian cheng State Key Laboratory of Advanced Metallurgy School of Metallurgical and Ecological EngineeringUniversity of Science and Technology of Beijing Jiuquan Iron and Steel (Group) Co. Ltd.

Steel and slag samples were taken at the start and the end of LF refining for steel plate cold common （SPCC）, in the compact strip production （CSP） process, and at the same time, the temperature and oxygen activity a[o] were measured by using an oxygen sensor. Furthermore, inclusions in steel samples were monitored by scanning electron microscopy （SEM） combined with energy dispersive spectroscopy （EDS）. It was confirmed that a [o] in liq- uid steel was in equilibrium with inclusion rather than with top slag during LF refining. Desulfurization was related to deoxidation since a[o] at slag-steel interface was clarified to be very close to that in liquid steel under the specific con- dition in LF with intense stirring by argon blowing and refined by highly basic low oxidizing slag for Al-killed steel. Sulfur partition ratio （Ls） was very sensitive to a[o]. Since a[o] increased rapidly with temperature rise, it not only offset promotion to desulfurization reaction with temperature rise but decreased Ls. For Al-killed steel, ***- tion of Al2O3 for lowering the activity of Al2O3 in inclusion was believed to be favorable for both deoxidation and desulfurization during LF refining.

关键词： deoxidation desulfurization inclusion sulfur partition ratio LF refining

Organocatalytic polymerization

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Science China Chemistry 2019年第9期62卷 1087-1089页

作者： cheng-jian Zhang Xing-Hong Zhang Key Laboratory of Macromolecular Synthesis and Functionalization (Ministry of Education) Department of Polymer Science and EngineeringZhejiang University

Organocatalysis, defined as the use of small organic molecules for catalyzing chemical transformations, can be traced back more than a century and has become a thriving area over the past 20 years.

关键词： Organocatalytic polymerization organic molecules catalyzing chemical transformations

The Origin of The Soft X-Ray Excess in the Seyfert 1.5 Galaxy ESO 362-G18

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Research in Astronomy and Astrophysics 2022年第3期22卷 10-32页

作者： Xiao-Gu Zhong jian-cheng Wang Yunnan Observatories Chinese Academy of SciencesKunming 650216China Key Laboratory for the Structure and Evolution of Celestial Objects Chinese Academy of SciencesKunming 650216China University of Chinese Academy of Sciences Beijing 100049China

We review the Seyfert 1.5 Galaxy ESO 362-G18 for exploring the origin of the soft X-ray *** Warm Corona and Relativistic Reflection models are two main scenarios to interpret the soft X-ray excess in active galactic nuclei at *** use the simultaneous X-ray observation data of XMM-Newton and Nu STAR on2016 September 24 to perform spectral analysis in two ***,we analyze the time-average spectra by using Warm Corona and Relativistic Reflection ***,we also explore the Hybrid model,Double Reflection model and Double Warm Corona *** find that both the Warm Corona and Relativistic Reflection models can interpret the time-average spectra well but cannot be distinguished easily based on the time-averaged spectra fit ***,we add the rms and covariance spectra to perform the spectral analysis with time-average *** result shows that the warm corona could reproduce all of these spectra *** hot,optical thin corona and neutral distant reflection will increase their contribution with the temporal frequency,meaning that the corona responsible for X-ray continuum comes from the inner compact X-ray region and the neutral distant reflection is made of some moderate scale neutral clumps.

关键词： galaxies:active galaxies:individual(ESO 362-G18) galaxies:Seyfert

Chlorine Gas Sensors with HPS Film on Interdigitated Capacitors

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稀有金属材料与工程 2006年第A03期35卷 152-154页

作者： Wang dao jiang Lingyan Fan Cuiyun Yang Yang cheng Shuiyuan Research Office of Chemical Sensors College of Environmental and Energy Engineering Beijing University of Technology Beijing 100022 China

The Cl2-sensitive heteropolysiloxanes(HPS) film was formed on the interdigital capacitor based on silicon dioxide by means of sol-gel process and spin-on *** of interdigital capacitance were performed at room temperature for frequencies 100 Hz,1 kHz and 10 *** is shown that there is a linear relationship between the capacitance and the concentration of chlorine *** of the measurement frequency and film thickness of silicate on the sensitivity of the sensor to C12 gas were *** organically modified N,N-diethylaminopropyl-trimethoxysilane (APMS) had a much higher sensitivity.

关键词： chlorine sensor HPS thin film interdigital capacitors

Self-trapped spatially localized states in combined linear-nonlinear periodic potentials

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Frontiers of physics 2020年第1期15卷 17-24页

作者： Jin-cheng Shi jian-Hua Zeng State Key Laboratory of Transient Optics and Photonics Xi’an Institute of Optics and Precision Mechanics of CASXi’an 710119China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory for Physical Electronics and Devices of the Ministry of Education&Shaanxi Key Lab of Information Photonic Technique Xi’an Jiaotong UniversityXi’an 710049China

We analyze the existence and stability of two kinds of self-trapped spatially localized gap modes,gap solitons and truncated nonlinear Bloch waves,in one-and two-dimensional optical or matter-wave media with self-focusing nonlinearity,supported by a combination of linear and nonlinear periodic lattice *** former is found to be stable once placed inside a single well of the nonlinear lattice,it is unstable *** to the case with constant self-focusing nonlinearity,where the latter solution is always unstable,here,we demonstrate that it nevertheless can be stabilized by the nonlinear lattice since the model under consideration combines the unique properties of both the linear and nonlinear *** practical possibilities for experimental realization of the predicted solutions are also discussed.

关键词： gap solitons and gap waves Bose-Einstein condensates linear and nonlinear periodic potentials

Observation and simulation of wind waves near a typical reef lagoon in South China Sea

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Journal of Hydrodynamics 2021年第1期33卷 24-32页

作者： Ze Sun dao-lin Xu Xiao-long Liu Hai-cheng Zhang Zhi-wen Cai China Ship Scientific Research Center Wuxi 214082China Centre for Marine Technology Hunan UniversityChangsha 410082China Southern Marine Science and Engineering Guangdong Laboratory Zhanjiang 524025China

Due to the inference of the uneven shallow water seabed and the surrounding islands,the wind-generated waves around or in a reef lagoon are rather complicated,and critical to the safety of floating structures deployed near islands or inside a *** paper aims to find a feasible analysis tool for the wave simulations near islands and *** proposed three methods of grid techniques of WAVEWATCH III(WW3)are assessed by using on-site measured data which was collected and accumulated for about 5 years since August 2014 by a wave observation system deployed inside and outside a reef lagoon in South China *** the assessments,the wave statistics including the correlation coefficients,root mean square errors,and their variances are used to quantify the precisions of the simulation results of the significant wave heights,mean wave periods,and peak wave directions at two *** the three methods,the Multi-scale Zone and Multi-scale grid Technique(MZMGT)established on unstructured triangular grids exhibits better results in terms of the accuracy and CPU *** addition,the bimodal feature of wave spectra was observed at both sites of the reef lagoon in different typhoon *** wave characteristics inside the reef lagoon and open sea are also analyzed.

关键词： Wave simulation reef lagoon WAVEWATCH III(WW3) grid methods typhoon waves on-site measurements

Role of trivalent antimony in the removal of As, Sb, and Bi impurities from copper electrolytes

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International Journal of Minerals,Metallurgy and Materials 2013年第1期20卷 9-16页

作者： Fa-xin Xiao dao Cao jian-wei Mao Xiao-ni Shen Feng-zhang Ren School of Materials Science and engineering Henan University of Science and Technology Henan Key Laboratory of Advanced Nonferrous Metal Materials

The role of trivalent antimony was investigated in removing As, Sb, and Bi impurities from a copper electrolyte. Puri- fication experiments were carried out by adding a various concentrations of Sb（III） ions in a synthetic electrolyte containing 185 g/L sulfuric acid, 45 g/L Cu2＋, 10 g/L As, and 0.5 g/L Bi under stirring at 65℃ for 2 h. The electrolyte was filtered, and the structure, morphology and composition of the precipitate were analyzed by means of chemical analysis, scanning electron mi- croscopy （SEM）, X-ray diffraction （XRD）, transmission electron microscopy （TEM）, and IR spectroscopy. The precipitate is composed of irregular lumps which are agglomerated by fine dendritic and floccus particles, and it mainly consists of As, Sb, Bi, and O elements. Characteristic bands in the IR spectra of the precipitate are As-OX （X=As, Sb, Bi）, Sb-OY （Y=Sb, Bi）, O-As-O1 As-OH, Sb-OH, and O-H. The precipitate is a mixture of microcrystalline SbAsQ, （Sb,As）203, and amorphous phases. As, Sb, and Bi impurities are effectively removed from the copper electrolyte by Sb（III） ions attributing to these pre- cipitates.

关键词： copper metallurgy electrorefining electrolytes impurities removal antimony arsenic bismuth

Lie transformation on shortcut to adiabaticity in parametric driving quantum systems

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Chinese Physics B 2021年第6期30卷 111-115页

作者： jian-jian cheng Yao Du Lin Zhang School of Physics and Information Technology Shaanxi Normal UniversityXi'an 710119China

Shortcut to adiabaticity(STA) is a speedway to produce the same final state that would result in an adiabatic, infinitely slow process. Two typical techniques to engineer STA are developed by either introducing auxiliary counterdiabatic fields or finding new Hamiltonians that own dynamical invariants to constraint the system into the adiabatic paths. In this paper,an efficient method is introduced to naturally cover the above two techniques with a unified Lie algebraic framework and neatly remove the design difficulties and loose assumptions in the two techniques. A general STA scheme for different potential expansions concisely achieves with the aid of squeezing transformations.

关键词： shortcut to adiabaticity parametric driving Lewis–Riesenfeld invariants

Transformer real-time reliability model based on operating conditions

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第3期8卷 378-383页

作者： HE jian cheng Lin SUN Yuan-zhang State Key Laboratory of Power Systems Department of Electrical Engineering Tsinghua University Beijing 100084 China

Operational reliability evaluation theory reflects real-time reliability level of power system. The component failure rate varies with operating conditions. The impact of real-time operating conditions such as ambient temperature and transformer MVA (megavolt-ampere) loading on transformer insulation life is studied in this paper. The formula of transformer failure rate based on the winding hottest-spot temperature (HST) is given. Thus the real-time reliability model of transformer based on oper- ating conditions is presented. The work is illustrated using the 1979 IEEE Reliability Test System. The changes of operating conditions are simulated by using hourly load curve and temperature curve, so the curves of real-time reliability indices are ob- tained by using operational reliability evaluation.

关键词： Operational reliability Real-time reliability model Transformer Winding hottest-pot temperature (HST)

Tuning turbulent convection through rough element arrangement

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Journal of Hydrodynamics 2022年第2期34卷 308-314页

作者： jian-zhao Wu dao-liang Dong Bo-fu Wang Yu-hong Dong Quan Zhou Shanghai Institute of Applied Mathematics and Mechanics School of Mechanics and Engineering ScienceShanghai Key Laboratory of Mechanics in Energy EngineeringShanghai UniversityShanghai200072China

The tuning of turbulent Rayleigh-Bénard(RB)convection in a box is realized numerically by designed rough element *** the nonlinear dynamics of the thermal turbulence system,five models with rough elements of different widths and the same height are proposed to tune the fluid flow heat-transport *** simulations are performed using spectral element method for Rayleigh number in the range 10^(6)≤Ra≤10^(9) and a fixed Prandtl number Pr=*** is found that heat transport is enhanced for large roughness widths as the interaction between the large-scale circulation and secondary flows inside the cavity regions between the rough elements promotes the eruptions of thermal plumes,but is suppressed for small ones as more heat are trapped inside the *** all the rough models studied,different scaling exponents for the heat transport are identified and the influences of roughness arrangement on flow structure are studied.

关键词： Rayleigh-Bénard(RB)turbulence heat transport roughness arrangement