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Properties of Flare Events on M Stars from LAMOST Spectral Survey Based on Kepler and TESS Light Curves

Research in Astronomy and Astrophysics 2023年第5期23卷 1-18页

作者： Gang meng Li-Yun Zhang Tianhao Su Zilu Yang Xianming LHan Prabhakar Misra Liu long Qingfeng Pi Zhongzhong zhu Linyan Jiang College of Physics&Guizhou Provincial Key Laboratory of Public Big Data Guizhou UniversityGuiyang 550025China Department of Astronomy Beijing Normal UniversityBeijing 100875China Dept.of Physics and Astronomy Butler UniversityIndianapolisIN 46208USA Department of Physics&Astronomy Howard University WashingtonDC 20059USA College of Medicine Guizhou University of Traditional Chinese MedicineGuiyang 550025China Guiyang Institute of Information Science and Technology Guiyang 550025China

A catalog of M stars has been published from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope data release 7(LAMOST DR7).We cross-matched the LAMOST M catalog with Kepler,Kepler 2(K2)and Transiting Exoplanet Survey Satellite(TESS)*** obtained the light curves from the Kepler and TESS *** detected 20,047 flare events from 4053 M stars and calculated their durations,amplitudes,and *** analyzed the distribution of the flare durations and *** distributions of flare duration for Kepler,K2 and TESS peak are at 3–3.5 hr,4–6 hr and 1–1.5 hr,*** may be the result of the different cadences for the three data *** highest regions of the flare energies of Kepler,K2 and TESS are 32–32.5,32–32.5 and31–31.5 erg in Log format,respectively.A linear relationship between flare duration and energy emerges from our *** ratio of flare duration to total observational time is approximately 0.2%–0.3%for the Kepler,K2 and TESS *** occurrence rate of a star with a flare event increases from the M0 to M4 *** also determined the spatial distribution of the flare rate of M stars in the Milky *** seems that the flare rate decreases as the vertical height *** power index of the flare energies is in the region of 1.53–2.32,which is similar to previous result for solar type star(2.0).Further,we examined the relationship between the flare amplitude and chromospheric *** flare activity increases rapidly with the increase in the HαEW at the lower values(less approximately 2?)and it increases slowly at the higher values.

关键词： stars activity-stars flare-stars low-mass

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Constructing the Basis Path Set by Eliminating the Path Dependency

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Journal of Systems Science & Complexity 2022年第5期35卷 1944-1962页

作者： zhu Juanping meng Qi CHEN Wei WANG Yue MA Zhiming School of Mathematics and Statistics Yunnan UniversityKunming 650500China Microsoft Research Asia Beijing 100190China Academy of Mathematics and Systems Science Chinese Academy of ScienceBeijing 100190China

The newly appeared G-SGD algorithm can only heuristically find the basis path set in a simple neural network,so its generalization to a more practical network is *** the perspective of graph theory,the BasisP athSetSearching problem is formulated to find the basis path set in a complicated fully connected neural *** paper proposes algorithm DEAH to hierarchically solve the BasisP athSetSearching problem by eliminating the path *** this purpose,the authors discover the underlying cause of the path dependency between two independent *** path subdivision chain is proposed to effectively eliminate the path dependency,both inside the chain and between *** theoretical proofs and the analysis of time complexity are presented for Algorithm *** paper therefore provides one methodology to find the basis path set in a general and practical neural network.

关键词： Basis path neural network path dependency path subdivision chain substructure path

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Reaction mechanism for in-situ β-SiAlON formation in Fe3Si–Si3N4–Al2O3 composites

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International Journal of Minerals,Metallurgy and Materials 2017年第3期24卷 324-331页

作者： Hai-xia Qin Yong Li Li-xiong Bai meng-long long Wen-dong Xue Jun-hong Chen School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China

In this work,Fe_3Si–Si_3N_4–Al_2O_3 composites were prepared at 1300°C in an N_2 atmosphere using fused corundum and tabular alumina particles,Al_2O_3 fine powder,and ferrosilicon nitride(Fe_3Si–Si_3N_4) as raw materials and thermosetting phenolic resin as a *** effect of ferrosilicon nitride with different concentrations(0wt%,5wt%,10wt%,15wt%,20wt%,and 25wt%) on the properties of Fe_3Si–Si_3N_4–Al_2O_3 composites was *** results show that the apparent porosity varies between 10.3% and 17.3%,the bulk density varies from 2.94 g/cm^3 and 3.30 g/cm^3,and the cold crushing strength ranges from 67 MPa to 93 *** the experimental conditions,ferrosilicon nitride,whose content decreases substantially,is unstable;part of the ferrosilicon nitride is converted into Fe_2C,whereas the remainder is retained,eventually forming the ferrosilicon *** assessment of the Si_5AlON_7 indicated that the ferrosilicon alloy accelerated the reactions between Si_3N_4 and α-Al_2O_3 fine powder and that Si in the ferrosilicon alloy was nitrided directly,forming β-Si Al ON *** addition,fused corundum did not react directly with Si_3N_4 because of its low reactivity.

关键词： alumina ferrosilicon nitride SiAlON liquid sintering reaction mechanisins

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Recent progress on green electromagnetic shielding materials based on macro wood and micro cellulose components from natural agricultural and forestry resources

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Nano Research 2022年第8期15卷 7506-7532页

作者： Chuanyin Xiong Tianxu Wang Yongkang Zhang meng zhu Yonghao Ni College of Bioresources Chemical&Materials Engineering Shaanxi University of Science and TechnologyXi’an 710021China Limerick Pulp&Paper Ctr University of New BrunswickFrederictonNB E3B 5A3Canada

Recent research efforts in the field of electromagnetic interference shielding(EMI)materials have focused on biomass as a green and sustainable *** specifically,wood and cellulose nano fiber(CNF)have many advantages,some of which include lightweight,porosity,widespread availability,low cost,and easy *** favorable properties have led researchers to consider these types of biomass as an EMI shielding material with great *** present,while many excellent published works in EMI shielding materials have investigated wood and CNF,this research area is still new,compared with non-biomass EMI shielding *** specifically,there is still a lack of in-depth research and summary on the preparation process,pore structure regulation,component optimization,and other factors affecting the EMI shielding of wood and CNF based EMI shielding ***,this review paper presents a comprehensive summary of recent research on wood and CNF based EMI shielding materials in recent three years in terms of the preparation methods,material structure design,component synergy,and EMI mechanism,and a forward future perspective for existing problems,challenges,and development *** ultimate goal is to provide a comprehensive and informative reference for the further development and exploration of biomass EMI shielding materials.

关键词： biomass materials wood and nano cellulose fiber electromagnetic interference shielding pore structure regulation component synergy

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Detection of the assimilation characteristics of iron ores: Dynamic resistance measurements

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International Journal of Minerals,Metallurgy and Materials 2020年第1期27卷 18-25页

作者： Li-xin Qian Tie-jun Chun Hong-ming long Qing-min meng School of Metallurgical Engineering Anhui University of TechnologyMa’anshan 243002China Key Laboratory of Metallurgical Emission Reduction&Resources Recycling Ministry of EducationAnhui University of TechnologyMa’anshan 243002China

Resistance in iron ore undergoes a sharp change of up to several orders of magnitude when the sintered solid phase changes to liquid *** view of the insufficiency of existing assimilation detection methods,a timing-of-assimilation reaction is proposed,which was judged by continuously detecting the changes in resistance at the reaction *** of pole position and additional amounts of iron ore on assimilation reaction timing were *** results showed that the suitable depth of pole groove was about 2 mm,and there was no obvious impact when the distance of the poles changed from 4 to 6 mm,or the amount of iron ore changed from 0.4 to 0.6 *** temperature of sudden change of resistance in the temperature-resistant image was considered to be the lowest assimilation temperature of iron *** accuracy of this resistance method was clarified by X-ray diffraction,optical microscope,and scanning electron microscope/energy dispersive spectrometer(SEM/EDS)analyses.

关键词： iron ore sintering assimilation characteristic resistance method interface

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De novo synthesis of atropisomeric benzofurans via Cu/SPDO complex catalyzed asymmetric formal [3 + 2] annulation

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Science China Chemistry 2025年第1期 174-180页

作者： Fan-Xiao meng Xing-Yu Wang Ka Lu Ju-Song Yang Fu-Min Zhang Ai-Jun Ma Bao Du Yong-Qiang Tu State Key Laboratory of Applied Organic Chemistry College of Chemistry and Chemical Engineering Lanzhou University School of Chemistry and Chemical Engineering Shanghai Jiao Tong University School of Biotechnology and Health Sciences Wuyi University

Herein, the de novo synthesis of atropisomeric benzofurans through the Cu/spirocyclic-pyrrolidine-oxazoline(SPDO) complex catalyze asymmetric formal [3 + 2] cycloaddition between quinones and ynamides is explored, producing a range of structurally diverse axially chiral benzofurans in satisfactory yields with good to excellent enantioselectivities. Furthermore, density functional theory calculations were applied to explain the possible reaction mechanism.

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Amino-functionalized Ti_(3)C_(2)T_(x) with anti-corrosive/wear function for waterborne epoxy coating

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Journal of Materials Science & Technology 2020年第19期54卷 144-159页

作者： Han Yan meng Cai Wen Li Xiaoqiang Fan Minhao zhu Key Laboratory of Advanced Technologies of Materials(Ministry of Education) School of Materials Science and EngineeringSouthwest Jiaotong UniversityChengdu 610031China Tribology Research Institute School of Mechanical EngineeringSouthwest Jiaotong UniversityChengdu 610031China

Two-dimensional Ti_(3)C_(2)T_(x) flakes have great application potential in various areas due to their optical,electronic,electrochemical and mechanical properties,but their anti-corrosion and wear-resistance performance were not well *** difficulties in achieving good dispersity and interface interaction of inorganic additives in organic coatings hinder the incorporation of Ti_(3)C_(2)T_(x) into the epoxy ***,few-layered Ti_(3)C_(2)T_(x) sheets with amino-functionalization were prepared,and as reinforced-additives were added into the waterborne epoxy ***-corrosion and tribological properties of as-prepared composite coatings were investigated in *** results reveal that the composite coating with 0.5 wt.%amino-functionalized Ti_(3)C_(2)T_(x) sheets shows excellent corrosion protection(the lowest frequency impedance was 3.12×10^(9) cm^(2))and wear resistance(wear rate was reduced by 72.74%).The greatly improving performance of composite coatings mainly depends on:(a)good dispersity and compatibility of amino-functionalized Ti_(3)C_(2)T_(x) in organic matrix,(b)high adhesion strength between coating and metal substrate and(c)the intrinsic properties of Ti3C2Tx *** work provides a good path for applications of MXene as multifunctional additives.

关键词： Ti_(3)C_(2)T_(x) Amino functionalization Waterborne epoxy coating Corrosion Wear

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Numerical study on transom stern ventilation and resistance of high-speed ship in calm water

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Journal of Hydrodynamics 2022年第5期34卷 864-875页

作者： Hui Wang Ren-chuan zhu meng-xiao Gu Le Zha State Key Laboratory of Ocean Engineering School of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong UniversityShanghai200240China Marine Design and Research Institute of China Shanghai200011China

A transom stern is a common design feature for a high-speed *** the present study,the transom stern ventilation of NPL 3b,5b hull is investigated by three methods:H−H formula,Doctors’formula,and computational fluid dynamics(CFD)method at *** the CFD method,the ratios of the wave elevation and wetted area are used to determine the transom *** of results show that Doctors’formula is more accurate to calculate the critical transom draft Froude *** then a Rankine panel method(RPM)based on the high-order boundary element method incorporated the modified transom stern condition is implemented to evaluate the steady wave problem of a high-speed fishery patrol ship in calm ***,free-surface(FS)and double body(DB)simulations based on Star-CCM+are carried out to obtain the wave-making resistance and total *** results of the resistance and wave pattern around the fishery patrol ship computed by RPM show generally good agreement with experimental measurement and CFD *** results indicate that the developed Rankine panel method with transom condition could predict the resistance of high-speed displacement ships with good accuracy.

关键词： Transom ventilation computational fluid dynamics(CFD)method Rankine panel method(RPM) high-speed ship double body simulation resistance

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High retention volume covalent organic polymer for xenon capture:Dynamic separation of Xe and Kr

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Green Energy & Environment 2022年第5期7卷 948-956页

作者： Qian Wang zhu meng Juntao Li Shuming Peng Zhonghua Xiang Institute of Nuclear Physics and Chemistry China Academy of Engineering PhysicsMianyangSichuan621900China State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing100029China Department of Chemistry Imperial College London20 Gordon StreetLondonWC1H0AJUK Department of Chemistry University College LondonLondonW120BZUK

Xenon capture and Xe/Kr separation are important processes in *** instance,Xe/Kr separation is an indispensable step in recycle and treatment of nuclear fuel *** different separation methods,selectively adsorb gas molecules using porous materials is a promising way to reduce the high energy consumption in traditional cryogenic ***,many reported adsorbents still face the challenges of:ⅰ) poor separation property at low Xe/Kr concentrations;ⅱ) insufficient retention volumes,which influence the viability of whole *** this work,we present a stable covalent organic polymer,i.e.,COP-14,showing promising potential for Xe/Kr *** dynamic breakthrough experiments,COP-14 successfully separates low concentration Xe(350 ppm) and Kr(35 ppm) from target gas ***,the xenon retention volume per gram(1700 mL g^(-1) at 298 K) of COP-14 in dynamics absorption process achieves 3.8 times of benchmark active *** good performance of the newly devloped COP-14 mainly from its rich nitrogen sites and suitable pore size with xenon *** promising results of COP-14 on Xe/Kr separation in this work provide a promising way for designing efficient Xe/Kr separation mateirals.

关键词： process separation retention

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Towards natural object-based image recoloring

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Computational Visual Media 2022年第2期8卷 317-328页

作者： meng-Yao Cui Zhe zhu Yulu Yang Shao-Ping Lu TKLNDST CSNankai UniversityTianjin 300350China Department of Radiology Duke UniversityDurhamNC 27705USA

Existing color editing algorithms enable users to edit the colors in an image according to their own *** artists who have an accurate grasp of color,ordinary users are inexperienced in color selection and matching,and allowing non-professional users to edit colors arbitrarily may lead to unrealistic editing *** address this issue,we introduce a palette-based approach for realistic object-level image *** data-driven approach consists of an offline learning part that learns the color distributions for different objects in the real world,and an online recoloring part that first recognizes the object category,and then recommends appropriate realistic candidate colors learned in the offline step for that *** also provide an intuitive user interface for efficient color *** color selection,image matting is performed to ensure smoothness of the object *** evaluation on various color editing examples demonstrates that our approach outperforms existing state-of-the-art color editing algorithms.

关键词： color editing object recognition color palette representation natural color

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