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Rare Metals 2023年第8期42卷 2774-2780页

作者： Xiao-yun Song yan Li Fei Zhang State Key Laboratory of Nonferrous Metals and Processes GRIMAT Engineering Institute Co.LtdBeijing 101407China School of Materials Science and Engineering Beihang UniversityBeijing 100191China

The effects of solution and aging heat treatment on microstructural evolution and room temperature tensile properties for as-forged Ni-45Ti-5Al-2Nb-1Mo alloy were investigated through scanning electron microscopy(SEM),transmission electron microscopy(TEM)and tensile *** results show that the microstructure of solution-treated alloy comprises NiTi matrix,Ti_(2)Ni and(Nb,Ti)ss *** aging treatment at 700℃for 6 and100 h,the distribution of Ti_(2)Ni and(Nb,Ti)ss precipitates increases in *** new type of precipitate is observed in the specimen aged at 700℃.After aging at800℃for 100 h,numerous nanosized Ni_(2)TiAl phases are precipitated within the *** and aging treatments improve the tensile properties at room *** strength and ductility are improved after solution treatment at 1100℃plus aging treatment at 800℃for 6 h or 700℃for 100 *** aging time prolonging to 100 h at 800℃,the precipitation of fine Ni2TiAl particles leads to the improvement in tensile strength and deterioration of elongation.

关键词： NiTi-Al-based alloy Intermetallics Microstructure Mechanical properties Heat treatment

Study of 3-D Numerical Simulation for Gas Transfer in the Goaf of the Coal Mining

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Journal of China University of Mining and Technology 2007年第2期17卷 152-157页

作者： WU Zheng-yan JIANG shu-guang HE Xin-jian WANG Lan-yun LIN Bai-quan School of Mining and Safety Engineering China University of Mining ＆ Technology Xuzhou Jiangsu 221008 China

In order to simulate field distribution rules,mathematical models for 3-D air flows and gas transfer in the goaf of the coal mining are established,based on theories of permeability and dynamic dispersion through porous media. A gas dispersion equation in a 3-D field is calculated by use of numerical method on a weighted upstream multi-element balance. Based on data of an example with a U type ventilation mode,surface charts of air pressure distribution and gas concentration are drawn by Graphtool software. Finally,a comparison between actually measured results in the model test and the numerical simulation results is made to proves the numerical implementation feasible.

关键词： 3D numerical simulation of gas transfer in the goaf air pressure distribution in the goaf weighted upstream multi-element balance numerical simulation method

Lung adenocarcinoma harboring rare epidermal growth factor receptor L858R and V834L mutations treated with icotinib:A case report

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World Journal of Clinical Cases 2020年第17期8卷 3841-3846页

作者： shu-Sen Zhai Hui Yu Tian-Tian Gu yan-Xia Li yan Lei Hai-yan Zhang Tong-Huan Zhen yun-Ge Gao Oncology Section PLA Strategic Support Force Characteristic Medical CenterBeijing 100101China Cancer Research Institute YuceBioShenzhen 518000Guangdong ProvinceChina

BACKGROUND Epidermal growth factor receptor(EGFR)tyrosine-kinase inhibitors are widely used for the treatment of non-small-cell lung cancer with EGFR ***,patients with rare,even compound EGFR mutations have different responses to EGFR-tyrosine-kinase inhibitors,which bring uncertainty to clinical *** SUMMARY A 45-year-old female patient presented with a 3-mo history of cough and white sputum without chest *** computed tomography revealed lung spaceoccupying lesions and multiple *** and pathology suggested lung *** variation of EGFR gene(exon 21 L858 R/V834 L)was detected in both tissue and circulating tumor deoxyribonucleic acid *** a result of next-generation sequencing and her family’s wishes,the patient was given oral treatment with icotinib hydrochloride(125 mg/d,tid)from March 21,2019 and has achieved stable disease for the last 1 *** Non-small cell lung adenocarcinoma with EGFR L858 R/V834 L was treated successfully with icotinib,and it may be a new medication treatment option.

关键词： Icotinib hydrochloride Epidermal growth factor receptor L858R/V834L Nonsmall cell lung cancer Stable disease Case report

The influences of convective overshooting and semiconvection on the chemical evolution of massive stars

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Research in Astronomy and Astrophysics 2014年第8期14卷 979-991页

作者： Cai-yun Ding yan Li yunnan Observatories Chinese Academy of Sciences Key Laboratory for the Structure and Evolution of Celestial Objects Chinese Academy of Sciences University of Chinese Academy of Sciences

In massive stars, convection in the interior is different from that of inter- mediate and small mass stars. In the main-sequence phase of small mass stars, there is a convective core and a radiative envelope, between which are the radiative inter- mediate layers with uneven chemical abundances. Semiconvection would occur in the intermediate layers between the convective core and the homogeneous envelope in massive stars. We treat core convective overshooting and semiconvection together as a process. We found that when decreasing overshooting, the semiconvection is more pronounced. In these two processes, we introduce one diffusive parameter D, which is different from other authors who have introduced different parameters for these two zones. The influences of the turbulent diffusion process on chemical evolution and other quantities of the stellar structure are shown in the present paper.

关键词： stars evolution -- stars abundances -- convection -- diffusion

Disjoint Cliques in Claw-free Graphs

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Acta Mathematicae Applicatae Sinica 2018年第1期34卷 19-34页

作者： Su-yun JIANG Jin yan School of Mathematics Shandong University

A graph is said to be claw-free if it does not contain an induced subgraph isomorphic to K_（1,3）. Let s and k be two integers with 0≤s≤k and let G be a claw-free graph of order n. In this paper, we investigate clique partition problems in claw-free graphs. It is proved that if n≥3 s ＋4（k-s） and d（x）＋ d（y）≥n-2 s ＋2 k ＋1 for any pair of non-adjacent vertices x, y of G, then G contains s disjoint K3 s and k-s disjoint K4 s such that all of them are disjoint. Moreover, the degree condition is sharp in some cases.

关键词： claw-free graphs disjoint clique degree condition

On the Structure of Split Leibniz Triple Systems

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Acta Mathematica Sinica,English Series 2015年第10期31卷 1629-1644页

作者： yan CAO Liang yun CHEN School of Mathematics and Statistics Northeast Normal University Department of Basic Education Harbin University of Science and TechnologyRongcheng Campus

We study the structure of arbitrary split Leibniz triple systems with a coherent O-root space. By developing techniques of connections of roots for this kind of triple systems, under certain conditions, in the case of... 详细信息

关键词： Split Leibniz triple system Lie triple system Leibniz algebra system of roots root space

RESEARCHES ON THE TRANSVERSE DISTRIBUTION OF SUSPENDED LOAD CONCENTRATION

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Journal of Hydrodynamics 2003年第5期15卷 35-40页

作者： YueHong-yan XuFang DengJin-yun yangtzeRiverScientificResearchInstitute Wahan430010China ChongqingJiaotongUniversity Chongqing400074China SchoolofWaterResourceandHydropower WuhanUniversityWuhan430072China

In the paper the simplified three-dimensional turbulent diffusion equation ofthe suspended load is deduced by the power series method. The formula on the transversedistribution of the suspended load concentration is obtained, which is tested by a few field data onyangtze River. The simulation results indicate that the calculated data are in primary agreementwith the field data within the allowable error. It is certain value in theory and practice.

关键词： suspended load concentration turbulent transverse distribution numericalsolution

A mechanical model for the adhesive contact with local sliding induced by a tangential force

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Acta Mechanica Solida Sinica 2017年第4期30卷 369-373页

作者： Gan-yun Huang Ji-Feng yan Department of Mechanics School of Mechanical EngineeringTianjin University

Adhesion has been demonstrated to play an important role in contact and friction between objects at small scales. While various models have been established for adhesive contact under normal forces, studies on the adhesive contact under tangential force have been far fewer, which if any, are mostly confined to the non-slipping situations. In the present work, a model has been proposed for adhesive contact with local sliding under tangential forces. Herein, the onset of local sliding in adhesive contact has been addressed by assuming the nucleation of dislocations. By analogy with the emission of dislocations at a crack tip, the critical tangential force for the onset of sliding has been determined, and its effect on the evolution of contact size has also been studied. Comparison with relevant experiments has verified the validity of the present model.

关键词： Adhesive contact Tangential force Local sliding Dislocation Contact size

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知识建构社区交互行为对观点深度影响的研究

兵团教育学院学报 2025年第1期35卷 26-30页

作者：张红艳王韵石河子大学师范学院/兵团教育学院新疆石河子832003 长沙市高仓中学湖南长沙410134

知识建构理论注重学习者主动提出观点,通过各种交互行为让学生提出的观点走向更深的层次。文章对18节知识建构课堂交互行为进行了分析,探究不同交互行为对观点深度的影响。研究发现,知识建构社区中交互行为对观点深度的作用主要表现在... 详细信息

知识建构理论注重学习者主动提出观点,通过各种交互行为让学生提出的观点走向更深的层次。文章对18节知识建构课堂交互行为进行了分析,探究不同交互行为对观点深度的影响。研究发现,知识建构社区中交互行为对观点深度的作用主要表现在教师的言语行为和学生的言语行为两个方面,其中教师语言行为对观点深度的作用要大于学生语言行为的影响,由此可见知识建构社区走向深入教师的言语行为引导非常重要。

关键词：知识建构社区交互行为观点深度影响

On Disjoint Cycles of the Same Length in Tournaments

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Acta Mathematicae Applicatae Sinica 2022年第2期38卷 271-281页

作者： yun WANG JIN yan shuO ZHU School of Mathematics Shandong UniversityJinan 250100China

A tournament is an orientation of the complete *** form perhaps the most interesting class of digraphs and it has a great potential for *** provide a model of the statistical technique called the method of paired comparisons and they have also been studied in connection with sociometric relations in small *** this paper,we investigate disjoint cycles of the same length in *** 2010,Lichiardopol conjectured that for given integers l≥3 and k≥1,any tournament with minimum out-degree at least(l-1)k-1 contains k disjoint l-cycles,where an l-cycle is a cycle of order ***-Jensen et *** the conjecture for l=3 and Ma et *** that it also holds for l≥*** paper provides a proof of the conjecture for the case of 9≥l≥4.

关键词： tournaments minimum out-degree disjoint cycles