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Effects of different alloying elements M(M=Fe,Ni,Mn,si,Mo,Cu,Y)on Cr_(2)0_(3)with Cl:a first-principles study

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Journal of Iron and Steel Research International 2021年第5期28卷 613-620页

作者： Ya-nan Niu Nan Dong si Liu Jing Yang Pei-de Han Yu-cheng Wu College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024ShanxiChina Shanxi Engineering Technology Research Center for Energy Materials and Analysis and Testing Taiyuan University of TechnologyTaiyuan 030024ShanxiChina

Using the first-principles methods,the effects of different alloying elements M(M=Fe,Ni,Mn,si,Mo,Cu,Y)on Cr_(2)0_(3)with Cl adsorption are *** results show that the layer distance of all doped models has been widened to different degrees with Cl *** Mo or Y is doped into the passive film,the difference of layer distance is reduced to a certain *** interaction between alloying elements and Cl is studied by calculating the adsorption height,bond population and electron density *** results show that Mo and Y can inhibit Cl erosion and improve the corrosion resistance of passive ***,we investigate the CrMoFe and CrMoY co-doped system with Cl *** calculations point out that when Mo and Y are doped together in the passive film,the corrosion resistance of the system is more prominent than that of CrMo,CrY and CrMoFe co-doping systems.

关键词： Density functional theory Cr_(2)0_(3) Doping Cl Austenitic stainless steel

Path Factors and Neighborhoods of Independent Sets in Graphs

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Acta Mathematicae Applicatae sinica 2023年第2期39卷 232-238页

作者： si-zhong ZHOU School of Science Jiangsu University of Science and TechnologyZhenjiang 212100China

A path-factor is a spanning subgraph F of G such that every component of F is a path with at least two *** k≥2 be an integer.A P_(≥k)-factor of G means a path factor in which each component is a path with at least k vertices.A graph G is a P_(≥k)-factor covered graph if for any e∈E(G),G has a P_(≥k)-factor including ***βbe a real number with 1/3≤β≤1 and k be a positive *** verify that(ⅰ)a k-connected graph G of order n with n≥5k+2 has a P_(≥3)-factor if|NG(I)|>β(n-3k-1)+k for every independent set I of G with|I|=「β(2k+1)」;(ⅱ)a(k+1)-connected graph G of order n with n≥5k+2 is a P_(≥3)-factor covered graph if|NG(I)|>β(n-3k-1)+k+1 for every independent set I of G with|I|=「β(2k+1)」.

关键词： graph independent set neighborhood P≥3-factor P≥3-factor covered graph

Asymptotic Normality of Wavelet Density Estimator under Censored Dependent Observations

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Acta Mathematicae Applicatae sinica 2012年第4期28卷 781-794页

作者： si-li NIU Department of Mathematics Tongji University

In this paper, we discuss the asymptotic normality of the wavelet estimator of the density function based on censored data, when the survival and the censoring times form a stationary α-mixing sequence. To simulate the distribution of estimator such that it is easy to perform statistical inference for the density function, a random weighted estimator of the density function is also constructed and investigated. Finite sample behavior of the estimator is investigated via simulations too.

关键词： Wavelet density estimator asymptotic normality, censored data, α-mixing, random weightedestimator

A Result on Fractional(a,b,k)-critical Covered Graphs

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Acta Mathematicae Applicatae sinica 2021年第4期37卷 657-664页

作者： si-zhong ZHOU School of Science Jiangsu University of Science and TechnologyZhenjiang212100China

A fractional[a,b]-factor of a graph G is a function h from E(G)to[0,1]satisfying a≤d^(h)_(G)(v)≤b for every vertex v of G,where d^(h)_(G)(v)=∑e∈E(v)h(e)and E(v)={e=uv:u∈V(G)}.A graph G is called fractional[a,b]-covered if G contains a fractional[a,b]-factor h with h(e)=1 for any edge e of G.A graph G is called fractional(a,b,k)-critical covered if G—Q is fractional[a,b]-covered for any Q⊆V(G)with∣Q∣=*** this article,we demonstrate a neighborhood condition for a graph to be fractional(a,b,k)-critical ***,we claim that the result is sharp.

关键词： graph neighborhood fractional[a,6]-factor fractional[a.6]-covered graph fractional(a.b,k)-critical covered graph

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大豆产业链可持续发展的国际经验及启示

世界农业 2025年第1期 67-78页

作者：胡哲鹏司伟中国农业大学经济管理学院

大豆产业链的可持续发展是实现中国大豆产业振兴的关键途径，也是中国积极参与全球可持续发展治理的重要实践。本文基于联合国《2030年可持续发展议程》中可持续发展的目标和内涵，从经济、环境、社会三个维度提出了大豆产业链可持续发... 详细信息

大豆产业链的可持续发展是实现中国大豆产业振兴的关键途径，也是中国积极参与全球可持续发展治理的重要实践。本文基于联合国《2030年可持续发展议程》中可持续发展的目标和内涵，从经济、环境、社会三个维度提出了大豆产业链可持续发展的一般框架。根据该框架，本文梳理了美国、巴西及国际粮商构建可持续大豆产业链的主要经验和做法。结果表明，上述国家及企业可持续大豆产业链的建立，以联合国可持续发展目标和理念为基本遵循，展现出了政策规划系统性强、绿色创新引领作用突出、协同治理国际化程度高、出口竞争力提升明显等特征。基于上述发现，本文提出了加强顶层设计、推广绿色技术、优化贸易方式、发展绿色金融和建立追溯体系的启示和政策建议。

关键词：大豆产业链可持续发展

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Microstructure characterization and hydrogen storage properties study of Mg2Ni0.92M0.08（M = Ti, V, Fe or si） alloys

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Progress in Natural Science:Materials International 2018年第4期28卷 464-469页

作者： Yue Zhang Hairi Zhang Xiaoli Ding Dongming Liu Qingan Zhang Tingzhi si School of Materials Science and Engineering Anhui University of Technology

In the present study Mg2Ni-type compounds alloyed independently with Ti,V,Fe and si were successfully prepared by wet-milling followed by *** these alloyed Mg2Ni compounds exhibited a similar hydrogen storage mechanism as that of pure Mg2Ni,the dissolution of Ti,V or Fe into the Mg2NiH4lattice had a considerable catalytic effect on hydrogen desorption from additional *** further structure investigations clearly indicated that the substitution of Ti for Ni could suppress the formation of the micro-twined low-temperature phase（LT2）and promote the formation of the high-temperature phase（HT）,thus resulting in remarkably improved hydrogen desorption kinetics for the Mg2Ni0.92Ti0.08–H system.

关键词： Hydrogen storage Mg-based alloys Elemental substitution Kinetics

Automatic Circuit Extractor for HDL Description Using Program Slicing

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Journal of Computer Science & Technology 2004年第5期19卷 718-728页

作者： TunLi YangGuo si-KunLi SchoolofComputerScienceandTechnology NationalUniversityofDefenseTechnologyChangsha410073P.R.China

Design extraction and reduction have been extensively used in modern VLsi design process. The extracted and reduced design can be efficiently processed by various applications, such as formal verification, simulation, automatic test pattern generation (ATPG), etc. This paper presents a new circuit extraction method using program slicing technique, and develops an elegant theoretical basis based on program slicing for circuit extraction from Verilog description. The technique can obtain a chaining slice for given signals of interest. Compared with related researches, the main advantages of the method include that it is fine grain, it has no hardware description language (HDL) coding style limitation; it is precise and is capable of dealing with various Verilog constructions. The technique has been integrated with a commercial simulation environment and incorporated into a design process. The results of practical designs show the significant benefits of the approach.

关键词： program slicing chaining slice process dependence graph circuit extraction VLsi functional verification

Fermi Blazars in the Zwicky Transient Facility Survey:A Correlation Study

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Research in Astronomy and Astrophysics 2023年第7期23卷 64-79页

作者： si-si Sun Zhong-Xiang Wang Yi Xing Department of Astronomy School of Physics and AstronomyYunnan UniversityKunming 650091China Shanghai Astronomical Observatory Chinese Academy of SciencesShanghai 200030China

We report on our correlation analysis for theγ-ray blazars detected with the Large Area Telescope(LAT)onboard the Fermi Gamma-ray Space Telescope(Fermi),for which we use the Fermi-LAT data and the optical zr and zg band data from the Zwicky Transient Facility survey in the time period approximately from 2018 July to *** start from the full sample of the Fermi-LAT blazars and find~38%of them as significant variables in bothγ-ray and optical *** the variables,which are 705 blazars,95 are selected as our targets based on the requirement for theγ-ray *** 15 out of the 95 blazars are found to show theγ-ray-optical correlations in the~3.7 yr time *** of the 15 blazars are classified as low synchrotron peaked(LSP)ones with the time lags between theγ-ray and optical bands in a range from-19 to+25 *** results generally fit the often-considered emission scenario for the LSP *** cases of showing~-100 days time lags are discussed,which require farther studies for *** analysis results suggest that among the detected significant variables,~23%LSPs can showγ-ray and optical correlations,while their averageγ-ray fluxes are above~4×10^(-8)photon cm^(-2)s^(-1).

关键词： gamma-rays:galaxies (galaxies:)quasars:general (galaxies:)BL Lacertae objects:general

Three-dimensional adaptive finite-time guidance law for intercepting maneuvering targets

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Chinese Journal of Aeronautics 2017年第6期30卷 1985-2003页

作者： Yujie si Shenmin SONG Center for Control Theory and Guidance Technology Harbin Institute of Technology Harbin 150001 China

To intercept maneuvering targets at desired impact angles, a three-dimensional terminal guidance problem is investigated in this study. Because of a short terminal guidance time, a finitetime impact angle control guidance law is developed using the fast nonsingular terminal sliding mode control theory. However, the guidance law requires the upper bound of lumped uncertainty including target acceleration, which may not be accurately obtained. Therefore, by adopting a novel reaching law, an adaptive sliding mode guidance law is provided to release the drawback. At the same time, this method can accelerate the convergence rate and weaken the chattering phenomenon to a certain extent. In addition, another novel adaptive guidance law is also derived; this ensures systems asymptotic and finite-time stability without the knowledge of perturbations *** simulations have demonstrated that all the three guidance laws have effective performances and outperform the traditional terminal guidance laws.

关键词： Adaptive control Finite-time guidance law Impact angle Sliding mode control Three-dimensional guidance law