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International Journal of Minerals,Metallurgy and Materials 2021年第8期28卷 1264-1273页

作者： Lu Lin jia-qing Zeng Metallurgical Technology Institute Central Iron and Steel Research InstituteBeijing 100081China

In order to promote the intelligent transformation and upgrading of the steel industry, intelligent technology features based on the current situation and challenges of the steel industry are discussed in this paper. Based on both domestic and global research, functional analysis, reasonable positioning, and process optimization of each aspect of steel making are expounded. The current state of molten steel quality and implementation under narrow window control is analyzed. A method for maintaining stability in the narrow window control technology of steel quality is proposed, controlled by factors including composition, temperature, time, cleanliness, and consumption(raw material). Important guidance is provided for the future development of a green and intelligent steel manufacturing process.

关键词： steel manufacturing process steelmaking narrow window brand value green and intelligence process function

Reducing the calculation workload of the Green function for electromagnetic scattering in a Schwarzschild gravitational field

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Chinese Physics B 2019年第7期28卷 152-161页

作者： Shou-qing jia School of Computer Science and Engineering Northeastern University

When the finite difference time domain(FDTD) method is used to solve electromagnetic scattering problems in Schwarzschild space-time, the Green functions linking source/observer to every surface element on connection/output boundary must be *** the scatterer is electrically extended, a huge amount of calculation is required due to a large number of surface elements on the connection/output *** this paper, a method for reducing the calculation workload of Green function is *** Taylor approximation is applied for the calculation of Green *** transport equations are *** numerical results verify the effectiveness of this method.

关键词： Green function Schwarzschild space-time electromagnetic scattering finite difference time domain

Finite Volume Time Domain with the Green Function Method for Electromagnetic Scattering in Schwarzschild Spacetime

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Chinese Physics Letters 2019年第1期36卷 1-4页

作者： Shou-qing jia School of Computer Science and Engineering Northeastern University

The finite volume time domain(FVTD) algorithm and Green function algorithm are extended to Schwarzschild spacetime for numerical simulation of electromagnetic scattering. The FVTD method in Schwarzschild spacetime is developed by filling the flat spacetime with an equivalent medium. The Green function in Schwarzschild spacetime is acquired by solving initial value problems. Both the FVTD code and the Green function code are validated by numerical results. Scattering in Schwarzschild spacetime is simulated with these methods.

关键词： Green's function method Electromagnetic scattering schwarzschild

Influence of mechanical alloying time on the properties of Fe_3Al intermetallics prepared by spark plasma sintering

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Journal of University of Science and Technology Beijing 2007年第4期14卷 331-334页

作者： Chengchang jia qing He Jie Meng Lina Guo Materials Science and Engineering School University of Science and Technology Beijing Beijing 100083 China

The Fe3Al-based intermetallics were prepared by mechanical alloying and spark plasma sintering （SPS）, and the influence of milling time on the properties of materials was investigated. The phase identification was investigated by X-ray, and the surface morphology and fractography were observed by scanning electron microscope （SEM）. The mechanical properties such as bending strength, strain, and microhardness were tested. The results show that Fe reacts with Al completely to form Fe3Al during short SPS processing time. The relative densities of the sintered samples were nearly 100%. The mechanical properties of the sintered samples can be improved along with the milling time. The representative values are the bend strength of 1327 MPa and the microhardness of 434.

关键词： Fe3A1 intermetallics mechanical properties mechanical alloying and milling powder metallurgy

A Time-dependent Interaction Problem Between an Electromagnetic Field and an Elastic Body

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Acta Mathematicae Applicatae Sinica 2020年第1期36卷 95-118页

作者： Chang-kun WEI jia-qing YANG Bo ZHANG Academy of Mathematics and Systems Science Chinese Academy of SciencesBeijing 100190China School of Mathematical Sciences University of Chinese Academy of SciencesBeijing 100049China School of Mathematics and Statistics Xi’an Jiaotong UniversityXi’an 710049China

This paper considers the scattering of a time-dependent electromagnetic plane wave by a bounded elastic *** appropriate decomposition of the coupling interface conditions is proposed according to the Voigt’s model between the electromagnetic and elastic *** original unbounded scattering problem is equivalently reduced into an initial-boundary value problem in a bounded domain by introducing an exact transparent boundary condition(TBC)on a sufficiently large *** use of the Lax-Milgram lemma,the abstract inversion theorem of Laplace transform and the energy method,we verify the well-posedness and stability for the reduced ***,a priori estimates are established for the electromagnetic field and elastic displacement by taking special test functions directly in the time domain variational formulation.

关键词： electromagnetic elastic Laplace transform Lax-Milgram lemma energy method well-posedness

Two new dammarane-type sapogenins from Gynostemma pentaphyllum

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Chinese Chemical Letters 2011年第12期22卷 1461-1464页

作者： Xia Li jia qing Cao Lin Shi Yu qing Zhao School of Traditional Chinese Materia Medica Shenyang Pharmaceutical UniversityShenyang 110016China College of Food Science Shenyang Agriculture UniversityShenyang 110866China

Two new sapogenins,named（20S,24R）-3β,20,21β,25-tetrahydroxy-21,24-cyclodammarane（1）and 3β-hydroxyetio-17β-dammaranic acid（2）,were isolated from the alkaline hydrolysate of Gynostemma pentaphyllum *** structu... 详细信息

关键词： Gynostemma pentaphyllum Sapogenin Alkaline hydrolysate

Photoproduction of J/ ψ in pp and PbPb Collisions at Leading Order

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Chinese Physics Letters 2012年第8期29卷 65-68页

作者： ZHU jia-qing LI Yun-De Department of physics Yunnan UniversityKunming 650091

The production of J/ψ originating from photoproduction processes in pp and PbPb collisions at leading order is *** use the color singlet and color octet mechanisms for heavy quarkonium production to deal with the direct photon processes,and consider fragmentation *** shadowing and iso-spin of the nucleus are also considered in our *** numerical results show that the modification of photoproduction processes for J/ψ production becomes obvious in the large pT region at LHC energy.

关键词： calculation processes energy

Development of amplified consensus genetic markers in Taxodiaceae based on Cryptomeria japonica ESTs data

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Journal of Forestry Research 2013年第3期24卷 503-508页

作者： LU Yong-quan jia qing TONG Zai-kang The Nurturing Station for the State Key Laboratory of Subtropical Silviculture Zhejiang Agriculture and Forestry University

Amplified consensus genetic marker （ACGM） is a PCR-based marker technique that uses primers designed within conserved regions of coding sequences. After a comparison of Cryptomeria japonica and Arabidopsis ESTs to search for conserved sequences, 237 single e-PCR products were obtained. We randomly selected 110 candidate ACGM markers to test. Of the 110 candidate ACGM markers tested, 106 yielded stable and clear PCR products in C. japonica. We then tested the utility of these 106 primer pairs in 10 species, representing 7 genera of Taxodi- aceae. The number of specific amplification primer pairs among those 10 species varied from 49 to 103 （or 46.2±97.2%）. The 106 primer pairs （ACGM loci） were high transferable to Cryptomeria fortunei Hooibrenk （97.2%） but were low in Metasequoia glyptostroboides （46.2%）. The number of PCR bands per primer pair ranged from 1.06 to 1.15, which means that most of the ACGM primers can obtain a single band within these 10 Taxodiaceae species. In summary, our study shows that ACGM is a technique applicable for marker development even in species with limited sequence data.

关键词： ACGM Taxodiaceae Cryptomeriajaponica EST database

Cloning and sequence analysis of nine novel MYB genes in Taxodiaceae plants

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Journal of Forestry Research 2014年第4期25卷 795-804页

作者： Yong-quan LU qing jia Zai-kang TONG The Nurturing Station for the State Key Laboratory of Subtropical Silviculture Zhejiang Agriculture and Forestry University

Myeloblastosis （MYB） is one of the largest transcribed factor families in plants. To gain an overall picture of the evolution of MYB genes in relict plants, we cloned nine novel MYB genes in Taxodiaceae plants （ Taxodium distichum, Taxodium ascendens, Cryptomeria japonica var. Sinensis, Cryptomeria japonica cv. Araucarioides, Cryptomer Ja- ponica, Metasequoia glyptostroboides, Cunninghamia lanceolata, Tai- wania cryptomerioides and Glyptostrobus pensilis）. The deduced amino acid sequences for MYBs showed that the nine MYB proteins contained two DNA binding domains. The first domain is from amino acid position 29 to 78, wherein three tryptophanes at 33, 53 and 73 were separated by 19 amino acids, respectively. The second domain is from amino acid position 82 to 127, wherein three tryptophanes at 86, 105 and 124 were separated by 18 amino acids, respectively, whereas the first tryptophane at amino acid position 86 is replaced by a phenylalanine. The characteri- zation of these conserved domains at nine MYBs indicated that they all belong to the R2R3-MYB group. The secondary structure analysis showed that a-helix and 13-turn are the major motifs of the predicted secondary structure of MYBs. The three dimensional model of each MYB protein showed that the structure is like clip, making it more flexi- ble and mobile. The similarities between the nine MYB proteins in Taxodiaceae were calculated. The highest identical value of 99% is be- tween CjsMYB, CjMYB and CjaMYB, whereas the lowest value of 82% is between TaMYB and C1MYB. According to the phylogenetic tree, the distances between different genera were relatively large whereas those within genera were relatively small. As expected, accessions of the same genus formed a subgroup before being grouped with other genera.

关键词： Myeloblastosis Taxodiaceae clone analysis R2R3-MYB group