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Epigenetic regulation of plant immunity:from chromatin codes to plant disease resistance

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aBIOTECH 2023年第2期4卷 124-139页

作者： si-si Xie Cheng-Guo Duan Shanghai Center for Plant Stress Biology and CAS Center for Excellence in Molecular Plant Sciences Chinese Academy of SciencesShanghai 200032China University of the Chinese Academy of Sciences Beijing 100049China

Facing a deteriorating natural environment and an increasing serious food crisis,bioengineering-based breeding is increasing in *** defend against pathogen infection,plants have evolved multiple defense mechanisms,including pathogen-associated molecular pattern(PAMP)-triggered immunity(PTI)and effector-triggered immunity(ETI).A complex regulatory network acts downstream of these PTI and ETI pathways,including hormone signal transduction and transcriptional *** recent years,increasing lines of evidence show that epigenetic factors act,as key regulators involved in the transcriptional reprogramming,to modulate plant immune ***,we summarize current progress on the regulatory mechanism of DNA methylation and histone modifications in plant defense *** addition,we also discuss the application of epigenetic mechanism-based resistance strategies in plant disease breeding.

关键词： Histone modification DNA methylation Transcriptional reprogramming Plant immunity Disease resistance

Condensed Galerkin element of degree m for first-order initial-value problem with O(h^(2m+2))super-convergent nodal solutions

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Applied Mathematics and Mechanics(English Edition) 2022年第4期43卷 603-614页

作者： si YUAN Quan YUAN Department of Civil Engineering Key Laboratory of Civil Engineering Safety and Durability of China Education MinistryTsinghua UniversityBeijing 100084China

A new type of Galerkin finite element for first-order initial-value problems(IVPs)is *** the trial and test functions employ the same m-degreed *** adjoint equation is used to eliminate one degree of freedom(DOF)from the test function,and then the so-called condensed test function and its consequent condensed Galerkin element are *** is mathematically proved and numerically verified that the condensed element produces the super-convergent nodal solutions of O(h^(2m+2)),which is equivalent to the order of accuracy by the conventional element of degree m+*** related properties are addressed,and typical numerical examples of both linear and nonlinear IVPs of both a single equation and a system of equations are presented to show the validity and effectiveness of the proposed element.

关键词： Galerkin method finite element method(FEM) condensed element superconvergence adjoint operator initial-value problem(IVP)

Entangled multi-knot lattice model of anyon current

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Chinese Physics B 2019年第4期28卷 76-107页

作者： Tieyan si Physics Department School of Sciences Key Laboratory of Microsystems and Microstructures Manufacturing-Ministry of EducationHarbin Institute of Technology

We proposed an entangled multi-knot lattice model to explore the exotic statistics of anyons. Long-range coupling interaction is a fundamental character of this knot lattice model. The short-range coupling models, such as the Ising model,Hamiltonian model of quantum Hall effect, fermion pairing model, Kitaev honeycomb lattice model, and so on, are the short-range coupling cases of this knot lattice model. The long-range coupling knot lattice model bears Abelian and nonAbelian anyons, and shows integral and fractional filling states like the quantum Hall system. The fusion rules of anyons are explicitly demonstrated by braiding crossing states. The eigenstates of quantum models can be represented by a multilayer link lattice pattern whose topology is characterized by the linking number. This topological linking number offers a new quantity to explain and predict physical phenomena in conventional quantum models. For example, a convection flow loop is introduced into the well-known Bardeen–Cooper–Schrieffer fermion pairing model to form a vortex dimer state that offers an explanation of the pseudogap state of unconventional superconductors, and predicts a fractionally filled vortex dimer state. The integrally and fractionally quantized Hall conductance in the conventional quantum Hall system has an exact correspondence with the linking number in this multi-knot lattice model. The real-space knot pattern in the topological insulator model has an equivalent correspondence with the Lissajous knot in momentum space. The quantum phase transition between different quantum states of the quantum spin model is also directly quantified by the change of topological linking number, which revealed the topological character of phase transition. Circularized photons in an optical fiber network are a promising physical implementation of this multi-knot lattice, and provide a different path to topological quantum computation.

关键词： anyon knot lattice linking number quantum Hall effect

改进RT-DETR的无人机图像目标检测算法

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计算机工程与应用 2025年第01期61卷 98-108页

作者：姜贸翔司占军王晓喆天津科技大学人工智能学院北京航空航天大学无人系统研究院

针对轻小型无人机图像目标检测中由于目标灵活多样、环境复杂多变导致的检测精度低等问题，提出基于改进RT-DETR无人机目标检测算法。综合考虑轻量级simAM注意力和倒置残差模块改进ResNet-r18主干网络，提高目标检测模型的特征提取能力... 详细信息

针对轻小型无人机图像目标检测中由于目标灵活多样、环境复杂多变导致的检测精度低等问题，提出基于改进RT-DETR无人机目标检测算法。综合考虑轻量级simAM注意力和倒置残差模块改进ResNet-r18主干网络，提高目标检测模型的特征提取能力。采用级联分组注意力机制优化倒置残差模块和特征交互模块，提升特征选择能力，实现目标检测信息的精细化获取。颈部网络中引入160×160检测层，提升特征融合阶段小目标的感知能力。基于VisDrone2019数据集的实验结果表明，改进后的模型具有更低的参数量和更高的检测精度。在Alver＿Lab＿Ulastirma和HIT-UAV数据集上进一步验证了改进方法的有效性和鲁棒性。

关键词：小目标检测 DETR 注意力机制 Transformer 残差链接

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Influence of Ce and Mn addition on α-Fe morphology in recycled Al-si alloy ingots

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International Journal of Minerals,Metallurgy and Materials 2013年第9期20卷 890-895页

作者： Chao Fan si-yuan Long Huai-de Yang Xiang-jie Wang Jun-cheng Zhang College of Materials Science and Engineering Chongqing University Engineering Training Center Guangxi University of Science and Technology

The influence of Ce or Ce and Mn combined additions on the morphology of a-Fe phases in recycled Alosi alloys was experimentally investigated by microstructure observation and room temperature tensile testing. It is found that Ce modifies the morphology of a-Fe phase from the large Chinese script-like into the individual and fine nodular shape. A combined addition of Ce and Mn results in the promotion of primary a-Fe formation, and their size increases considerably with the increase in Ce content. The mechanism of the above morphological changes was discussed in accordance with the nucleation and growth of a-Fe phase during solidification.

关键词： aluminum-silicon alloys cerium manganese modification morphology

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