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Solidification in Soft-Contact Continuous Casting Mold with Alternating Electromagnetic Field

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Journal of Iron and Steel Research International 2003年第1期10卷 15-19页

作者： deng an-yuan HE Ji-cheng Northeastern University

The mechanical behavior of the mushy zone was studied in detail. Based on the analysis of conventional high temperature mechanical model, considering the physical phenomenon in casting process, a mechanical model suitable for describing the mechanical behavior of the casting material in twin roll casting process was built. Comparing experimental results to the numerical simulated ones, the mechanical model was proved to be correct.

关键词： strip casting mushy zone mechanical model constitutive equation

N-Soliton Solutions of General Nonlinear Schrdinger Equation with Derivative

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Communications in Theoretical Physics 2008年第5期49卷 1101-1104页

作者： ZHAI Wen CHEN deng-yuan Department of Mathematics Shanghai University Shanghai 200444 China

The bilinear equation of the genera/nonlinear Schrodinger equation with derivative （GDNLSE） and the N-soliton solutions are obtained through the dependent variable transformation and the Hirota method, respectively. The bilinear equation of the nonlinear Schrodinger equation with derivative （DNLSE） and its multisoliton solutions are given by reduction.

关键词： general nonlinear Schrodinger equation with derivative nonlinear SchrSdinger equation withderivative Hirota method

All-inorganic ultrathin high-sensitivity transparent temperature sensor based on a Mn-Co-Ni-O nanofilm

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Microsystems & Nanoengineering 2024年第3期10卷 195-205页

作者： yuanyuan Cui Mengwei Sun Changbo Liu yuan deng Research Institute for Frontier Science Beihang UniversityBeijing 100191China School of Materials Science and Engineering Beihang UniversityBeijing 100191China Key Laboratory of Intelligent Sensing Materials and Chip Integration Technology of Zhejiang Province Hangzhou Innovation Institute of Beihang UniversityHangzhou 310051China

The demand for optically transparent temperature sensors in intelligent devices is ***,the performance of these sensors,particularly in terms of their sensitivity and resolution,must be further *** study introduces a novel transparent and highly sensitive temperature sensor characterized by its ultrathin,freestanding design based on a Mn-Co-Ni-O *** Mn-Co-Ni-O-based sensor exhibits remarkable sensitivity,with a temperature coefficient of resistance of−4%℃^(−1),and can detect minuscule temperature fluctuations as small as 0.03℃.Additionally,the freestanding sensor can be transferred onto any substrate for versatile application while maintaining robust structural stability and excellent resistance to interference,indicating its suitability for operation in challenging *** practical utility in monitoring the surface temperature of optical devices is demonstrated through vertical integration of the sensor and a micro light-emitting diode on a polyimide ***,an experiment in which the sensor is implanted in rats confirms its favorable biocompatibility,highlighting the promising applications of the sensor in the biomedical domain.

关键词： transparent sensor versatile

A New Loop Algebra and Its Corresponding Multi-component Integrable Hierarchy

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Communications in Theoretical Physics 2006年第3期45卷 385-388页

作者： YAO Yu-Qin CHEN deng-yuan Department of Mathematics Shanghai University Shanghai 200444 China

A type of new loop algebra GM is constructed by making use of the concept of cycled numbers. As its application, an isospectral problem is designed and a new multi-component integrable hierarchy with multi-potential f... 详细信息

关键词： cycled numbers loop algebra multi-component integrable hierarchy

Effects of vertical electromagnetic stirring on grain refinement and macrosegregation control of bearing steel billet in continuous casting

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Journal of Iron and Steel Research International 2017年第5期24卷 483-489页

作者： Yu Xu En-gang Wang Zhuang Li An-yuan deng Key Laboratory of Electromagnetic Processing of Materials (Ministry of Education) Northeastern University Shenyang 110819 Liaoning China School of Metallurgy Northeastern University Shenyang 110819 Liaoning China School of Materials Science and Engineering Northeastern University Shenyang 110819 Liaoning China

The grain refinement and macrosegregation control of GCrl5 bearing steel were investigated under a type of rarely-used electromagnetic stirring, vertical electromagnetic stirring （V-EMS）, in continuous casting. V-EMS can create an upward electromagnetic force and generate longitudinal loop convection, which ena- bles the better mixing of the upper part with the lower part of the liquid steel. The results showed that ap- plying V-EMS can enlarge the region of the equiaxed grain, decrease the secondary dendrite arm spacing （SDAS） and reduce the segregation of both carbon and sulfur. After applying V-EMS, liquid steel with a high solute concentration is brought to the dendrite tips, making the dendrite arms partially melt. The length of the dendrite fragment is approximately 1.8 mm, 10 to 12 times the SDAS. Upon increasing the amount of cooling water from 2.0 to 3.5 m3/h, the dendrite fragments exhibit an obvious aggregation fol- lowing V-EMS. Finally, a criterion for dendrite fragmentation under V-EMS was derived based on the dendrite fragmentation theory of Campanella et al.

关键词： Vertical electromagnetic stirring Dendrite fragmentation Grain refinement Continuous casting Bearing steel Macrosegregation control

Characteristics and Controlling Factors of Shale Oil Reservoir Spaces in the Bohai Bay Basin

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Acta Geologica Sinica(English Edition) 2020年第2期94卷 253-268页

作者： deng yuan CHEN Shiyue PU Xiugang YAN Jihua School of Geosciences China University of Petroleum(East China)Qingdao 266580China Research Institute of Exploration and Development PetroChina Dagang Oilfield CompanyTianjin 300280China

The Cenozoic continental strata of the Bohai Bay Basin are rich in shale oil resources, and they contain various types of reservoir spaces that are controlled by complex factors. Using field emission scanning electron microscopy(FESEM), automatic mineral identification and characterization system(AMICS), CO2 and N2 gas adsorption, and focused ion beam scanning electron microscopy(FIB-SEM), the types of shale reservoir spaces in the Bohai Bay Basin are summarized, the spatial distribution and connectivity of the various types of pores are described in detail, the microscopic pore structures are characterized, and the key geological mechanisms affecting the formation and evolution of the reservoir spaces are determined. Three conclusions can be drawn in the present study. First, the shale reservoir spaces in the Bohai Bay Basin can be divided into three broad categories, including mineral matrix pores, organic matter pores, and micro fractures. Those spaces can be subdivided into seven categories and fourteen sub-categories based on the distribution and formation mechanisms of the pores. Second, the complex pore-throat structures of the shale reservoir can be divided into two types based on the shape of the adsorption hysteresis loop. The pore structures mainly include wedge-shaped, flat slit-shaped, and ink bottle-shaped pores. The mesopores and micropores are the main contributors to pore volume and specific surface area, respectively. The macropores provide a portion of the pore volume, but they do not significantly contribute to the specific surface area. Third, the factors controlling the development of microscopic pores in the shale are complex. The sedimentary environment determines the composition and structure of the shale and provides the material basis for pore development. Diagenesis controls the types and characteristics of the pores. In addition, the thermal evolution of the organic matter is closely related to inorganic diagenesis and drives the formati

关键词： reservoir characteristic pore structure controlling factor shale oil Bohai Bay Basin

An overview of thermoelectric films:Fabrication techniques,classification,and regulation methods

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Chinese Physics B 2018年第4期27卷 12-26页

作者： Jing-jing Feng Wei Zhu yuan deng School of Materials Science and Engineering Beihang University Beijing 100191 China Beijing Advanced Innovation Center for Biomedical Engineering Beihang University Beijing 100083 China

Thermoelectric materials have aroused widespread concern due to their unique ability to directly convert heat to electricity without any moving parts or noxious *** advantages of two-dimensional structures of thermoelectric films,the potential applications of thermoelectric materials are diversified,particularly in ***-controlled nanostructures in thermoelectric films are effective to optimize the electrical and thermal transport,which can significantly improve the performance of thermoelectric *** this paper,various physical and chemical approaches to fabricate thermoelectric films,including inorganic,organic,and inorganic–organic composites,are summarized,where more attentions are paid on the inorganic thermoelectric films for their excellent thermoelectric ***,strategies for enhancing the performance of thermoelectric films are also discussed.

关键词： thermoelectric films fabrication techniques classification regulation methods

LSB steganalysis of speech data based on distance measure and ML decision

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The Journal of China Universities of Posts and Telecommunications 2007年第3期14卷 103-107页

作者： deng Zong-yuan SHAO Xi YANG Zhen Institute of Signal and Information Processing Nanjing University of Postsand Telecommunications Nanjing 210003 China

Steganalysis can be used to classify an object whether or not it contains hidden information. In this article, is presented, a novel approach to detect the presence of least significant bit（LSB） steganographic messages in the voice secure communication system. A distance measure, which has proven to be sensitive to LSB steganography by analysis of variance （ANOVA）, is denoted to estimate the difference between the host signal and the stego signal. Then an maximum likelihood （ML） decision is combined to form the classifier. Statistical experiments show that the proposed approach has a highly accurate rate and low computational complexity.

关键词： speech signal processing LSB steganography steganalysis ML decision

Effect of Structure Parameters on Power and Magnetic Field in Electromagnetic Soft-Contact Continuous Casting System

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Journal of Iron and Steel Research International 2008年第1期15卷 19-24页

作者： deng an-yuan WANG En-gang HE Ji-cheng Key Laboratory of National Education Ministry for Electromagnetic Processing of Materials Northeastern UniversityShenyang 110004 Liaoning China

To design a power source system and mold for electromagnetic soft-contact continuous casting process and to theoretically estimate the heat losses from the charges and the system power, the effect of structure parameters on system power and magnetic flux density distribution was calculated using finite element method. The results show that as for electromagnetic soft-contact continuous casting system with partial-segment type mold, the power consumption is much more than that with a full-segment type mold; about 62% of electric power is dissipated in the mold, and the effective acting range of magnetic field is relatively narrow. Optimizing mold structure is a crucial measure of remarkably reducing mold power consumption and saving electric energy. Increasing slit number, width, and length can remarkably increase the magnetic flux density in the mold and can reduce the electric energy consumption. Among structure parameters, slit number and slit width are relatively more effective to reduce energy consumption. For a round billet electromagnetic continuous casting system with diameter of 178 ram, the reasonable slit number, width, and length are about 24--32, 0. 5--1.0 mm, and 160 mm, respectively.

关键词： continuous casting soft-contact mold electromagnetic field electric power structure parameter