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Interface characteristics between TiN and matrix and their effect on solidification structure

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Journal of Iron and Steel Research International 2021年第9期28卷 1149-1158页

作者： Tian-peng Qu De-yong Wang hui-hua Wang Dong Hou Jun Tian Shao-yan Hu Li-juan Su Shagang School of Iron and Steel Soochow UniversitySuzhou215021JiangsuChina

Heterogeneous nucleation is an effective way to promote the dispersion and precipitation of second-phase particles in steel and refine the grain size of the solidification *** only refining as-cast structure grain size,but TiN in ferritic stainless steel can also pin grain boundaries and restrain the overgrowth of grains during *** interface characteristics between TiN and heterogeneous phases(high-melting inclusions and ferrite phase)were studied based on the wetting angles between molten steel with different compositions and TiN substrate,and on the matching degree between TiN and ferrite *** was found that,for the molten steel with the same composition,the wetting angle with the TiN substrate was significantly smaller than the contact angles with the other three substrates,while the wetting angle between ferrite phase and TiN was the *** lattice matching was compared among MgAl_(2)O_(4),TiN andδmatrix by means of a high-resolution transmission electron microscope,which revealed that a coherent or semi-coherent interface was formed between the crystal plane(400)of MgAl_(2)O_(4)and the crystal plane(200)of TiN,as well as between the crystal plane(200)of TiN and the crystal plane(110)ofδmatrix,with a lattice misfit of 5.1%and 3.4%,***,these two characteristics between TiN and ferrite phase were both explained from the perspective of interfacial *** microstructure refinement mechanism from high temperature to room temperature can be better reflected by the proposed wetting–lattice misfit theory.

关键词： TiN Heterogeneous nucleation Interfacial wetting Lattice matching Grain refinement

Effects of angiopoietin-1 on attachment and metastasis of human gastric cancer cell line BGC-823

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World Journal of Gastroenterology 2009年第43期15卷 5432-5441页

作者： Xi-Long Ou hui-juan Chen Wei-Hao Sun Cheng Hang Liu yang Yun-yan Guan Fang yan Bao-An Chen Department of Gastroenterology Zhongda-Hospital Southeast University Nanjing 210009 Jiangsu Province China Department of Gastroenterology the Second Hospital of Nanjing Southeast University Nanjing 210003 Jiangsu Province China Department of Geriatrics First Affiliated Hospital of Nanjing Medical University Nanjing 210029 Jiangsu Province China Department of Intensive Care Unit Wuxi Hospital of Traditional Chinese Medicine Wuxi 214001 Jiangsu Province China Department of Oncology Changhai HospitalShanghai 200433 China

AIM： To evaluate the effects of angiopoietin-1 （Ang-1） on adhesion of gastric cancer cell line BGC-823 and expression of integrin β1, CD44V6, urokinase-type plasminogen activator （uPA） and matrix metalloproteinase-2 （MMP-2）. METHODS： BGC-823 cells were transfected transiently with adenovirus-Ang-1 （Ad-Ang-1）. Cells transfected transiently with adenovirus-green fluorescent protein （Ad-GFP） and untransfected cells were used as a negative and blank control group, respectively. The cell adhesion rate between cell and extracellular matrix （ECM） was determined by cell adhesion assay. To investigate whether Ang-1 could reinforce gastric carcinoma metastasis, we performed migration and invasion assays in BGC-823 cells. The mRNA and protein expression of integrin β1, CD44V6, uPA and MMP-2 were detected by reverse transcription polymerase chain reaction and Western blotting, respectively. The expression of integrin β1 and CD44V6 was measured by immunohistochemistry. RESULTS： BGC-823 cells were transfected successfully. The adhesion rate increased significantly in the Ad-Ang-1 group （P 〈 0.05）. The Ad-Ang-1-transfected group had a significant increase in migration and invasion compared with that of the mock-transfected and Ad-GFP groups. The mRNA and protein expression of integrin β1, CD44V6, uPA and MMP-2 in the Ad- Ang-1 group was higher than that in the Ad-GFP and blank control groups （P 〈 0.05）. Compared with mocktransfected and Ad-GFP groups, integrin 131 and CD44V6 expression intensity greatly increased （P 〈 0.05）. CONCLUSION： Transfection of Ang-1 into human gastric cancer cell line BGC-823 can significantly increase expression of integrin β1 and CD44V6, by which cell adhesion and metastasis to the ECM are promoted.

关键词： Angiopoietin-1 CD44V6 Cell adhesion Gastric cancer Integrin β1 Matrix metaUoproteinase-2 Neoplasm metastasis Urokinase-type plasminogen activator

Regionalization of Precipitation Regimes in China

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Atmospheric and Oceanic Science Letters 2009年第5期2卷 301-307页

作者： Chen Li-juan Chen De-Liang Wang hui-Jun yan Jing-hui National Climate Center Laboratory for Climate Studies Chinese Meteorological Administration Beijing 100081 China Department of Earth Sciences University of Gothenburg Gothenburg 40530 Sweden Nansen-Zhu International Research Center Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China

Precipitation regimes of China were mapped by using empirical orthogonal function (EOF) analysis with orthogonal rotation based on normalized monthly mean precipitation data at 400 stations from 1961 to *** regional boundaries were defined with the maximum-loading *** results identified 13 consistent and contiguous precipitation regions with distinct regional variations in China that are expected to reflect dominant regional patterns focusing on seasonal and interannual precipitation *** precipitation regionalization is operationally useful for seasonal and interannual climate predictions.

关键词： regionalization precipitation China REOF

Secrecy Efficiency Maximization in Intelligent Reflective Surfaces Assisted UAV Communications

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Computer Modeling in Engineering & Sciences 2023年第11期137卷 1805-1824页

作者： hui Wei Leibing yan School of Electronic Information Engineering Henan Institute of TechnologyXinxiang453003China

This paper focuses on the secrecy efficiency maximization in intelligent reflecting surface(IRS)assisted unmanned aerial vehicle(UAV)*** the popularization of UAV technology,more and more communication scenarios need UAV *** consider using IRS to improve the secrecy ***,IRS and UAV trajectories work together to counter potential eavesdroppers,while balancing the secrecy rate and energy *** original problem is difficult to solve due to the coupling of optimization *** first introduce secrecy efficiency as an auxiliary variable and propose relaxation optimization problem,and then prove the equivalence between relaxation problem and the original *** an iterative algorithm is proposed by applying the block coordinate descent(BCD)method and the inner *** simulation results show that the proposed algorithm converges fast and is superior to the existing *** addition,in order to improve the robustness of the algorithm,we also pay attention to the case of obtaining imperfect channel state information(CSI).

关键词： Secrecy unmanned aerial vehicle(UAV) intelligent reflecting surface(IRS) trajectory

Sparse recovery method for far-field and near-field sources localization using oblique projection

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The Journal of China Universities of Posts and Telecommunications 2013年第3期20卷 90-96页

作者： WANG Bo ZHAO yan-ping LIU juan-juan College of Communication Engineering Jilin University

In this paper, we propose a novel source localization method to estimate parameters of arbitrary field sources, which may lie in near-field region or far-field region of array aperture. The proposed method primarily constructs two special spatial-temporal covariance matrixes which can avoid the array aperture loss, and then estimates the frequencies of signals to obtain the oblique projection matrixes. By using the oblique projection technique, the covariance matrixes can be transformed into several data matrixes which only contain single source information, respectively. At last, based on the sparse signal recovery method, these data matrixes are utilized to solve the source localization problem. Compared with the existing typical source localization algorithms, the proposed method improves the estimation accuracy, and provides higher angle resolution for closely spaced sources scenario. Simulation results are given to demonstrate the performance of the proposed algorithm.

关键词： array signal processing near-field far-field sparse signal recovery oblique projection

Valuation of Futures Options with Initial Margin Requirements and Daily Price Limit

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Acta Mathematica Sinica,English Series 2010年第3期26卷 579-586页

作者： juan LI yan Ling GU School of Mathematics and Statistics Shandong University at Weihai Weihai 264209 P. R. China Treasury Department China Everbright Bank Beijing 100045 P. R. China

The paper presents a valuation model of futures options trading at exchanges with initial margin requirements and daily price limit, and this result gives an academic guidance to design trading rules at exchanges. Unlike the leading work of Black, certain trading rules are considered so as to be more fit for practical futures markets. The paper prices futures options with initial margin requirements and daily price limit by duplicating them with the help of the theory of backward stochastic differential equations （BSDEs, for short）. Furthermore, an explicit expression of the price Of the call （or the put） futures option is given and also is shown to be the unique solution of the associated nonlinear partial differential equation.

关键词： valuation of futures option initial margin requirements daily price limit backward stochastic differential equations

Four IVa bHLH Transcription Factors Are Novel Interactors of FIT and Mediate JA Inhibition of Iron Uptake in Arabidopsis

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Molecular Plant 2018年第9期11卷 1166-1183页

作者： yan Cui Chun-Lin Chen Man Cui Wen-juan Zhou hui-Lan Wu Hong-Qing Ling The State Key Laboratory of Plant Cell and Chromosome Engineering Institute of Genetics and Developmental Biology Chinese Academy of Sciences Beijing 100101 China University of Chinese Academy of Sciences Beijing 100049 China These authors contributed equally to this article

Plants have evolved sophisticated genetic networks to regulate iron （Fe） homeostasis for their survival. Several classes of plant hormones including jasmonic acid （JA） have been shown to be involved in regulating the expression of iron uptake and/or deficiency-responsive genes in plants. However, the molecular mechanisms by which JA regulates iron uptake remain unclear. In this study, we found that JA negatively modulates iron uptake by downregulating the expression of FIT （bHLH29）, bHLH38, bHLH39, bHLHIO0, and bHLHI01 and promoting the degradation of FIT protein, a key regulator of iron uptake in Arabidopsis. We further demonstrated that the subgroup IVa bHLH proteins, bHLH18, bHLH19, bHLH20, and bHLH25, are novel interactors of FIT, which promote JA-induced FIT protein degradation. These four IVa bHLHs function redundantly to antagonize the activity of the Ib bHLHs （such as bHLH38） in regulating FIT protein stability under iron deficiency. The four IVa bHLH genes are primarily expressed in roots, and are inducible by JA treatment. Moreover, we found that MYC2 and JAR1, two critical components of the JA signaling pathway, play critical roles in mediating JA suppression of the expression of FIT and Ib bHLH genes, whereas they differentially modulate the expression of bHLH18, bHLH19, bHLH20, and bHLH25 to regulate FIT accumulation under iron deficiency. Taken together, these results indicate that by transcriptionally regulating the expression of different sets of bHLH genes JA signaling promotes FIT degradation, resulting in reduced expression of iron-uptake genes, IRT1 and FRO2, and increased sensitivity to iron deficiency. Our data suggest that there is a multilayered inhibition of iron-deficiency response in the presence JA in Arabidopsis.

关键词： iron uptake jasmonic acid FIT IVa bHLH proteins Ib bHLH proteins

A Note on List Edge and List Total Coloring of Planar Graphs without Adjacent Short Cycles

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Acta Mathematica Sinica,English Series 2014年第1期30卷 91-96页

作者： hui juan WANG Jian Liang WU School of Mathematics Shandong University

LetGbe a planar graph with maximum degreeΔ.In this paper,we prove that if any4-cycle is not adjacent to ani-cycle for anyi∈{3,4}in G,then the list edge chromatic numberχl（G）=Δand the list total chromatic number... 详细信息

关键词： List edge coloring list total coloring planar graph cycle

Therapeutic effects of Qishen Yiqi Dropping Pill on myocardial injury induced by chronic hypoxia in rats

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Chinese Journal of Natural Medicines 2015年第10期13卷 776-780页

作者： YU Fu-Chao XU yan-juan TONG Jia-Yi LU Zhou-Zhou ZHANG Xiao-hui Cardiovascular Institute Southeast University Nanjing Official Hospital

The present study was designed to determine the effects of a traditional Chinese medicine, called Qishen Yiqi Dropping Pill on chronic hypoxia-induced myocardial injury. To establish a rat chronic hypoxia model to be used in the evaluation of the therapeutic effects of the Qishen Yiqi Dropping Pill, Sprague-Dawley （SD） rats were randomly divided into three groups： the control, model, and treatment groups （n - 10 per group）. The animals were housed in a plexiglass container. The control animals were under normal oxygen concentration and the model and treatment groups were exposed to air and nitrogen for 5 weeks. The rats in the treatment group were orally administered the Qishen Yiqi Dropping pill （35 mg-kg-1.d-1） for 5 weeks. After the treatment, the cardiac function and morphology were analyzed, and the expression levels of hypoxia-inducible factor la （HIF-1a） were determined using Western blotting. Our results indicated that the cardiac function was impaired, cell apoptosis was enhanced, and HIF-1a expression was up-regulated in the model group, compared to the control group. These changes were ameliorated by the treatment with the Qishen Yiqi Dropping Pill. In conclusion, Qishen Yiqi Dropping pill can ameliorate myocardial injury induced by chronic hypoxia, improve cardiac function, and decrease myocardial cell apoptosis, which may provide a basis for its clinical use for the treatment of chronic cardiovascular diseases

关键词： Qishen Yiqi Dropping pill Chronic hypoxia Myocardial injury HIF-1a