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A conservative local discontinuous Galerkin method for the solution of nonlinear Schrdinger equation in two dimensions

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Science China Mathematics 2017年第12期60卷 2515-2530页

作者： ZHANG RongPei YU XiJun li mingjun li XiangGui School of Mathematics and Systematic Sciences Shenyang Normal University Laboratory of Computational Physics Institute of Applied Physics and Computational Mathematics School of Mathematics and Computational Science Xiangtan University School of Applied Science Beijing Information Science and Technology University

In this study, we present a conservative local discontinuous Galerkin(LDG) method for numerically solving the two-dimensional nonlinear Schrdinger(NLS) equation. The NLS equation is rewritten as a firstorder system and then we construct the LDG formulation with appropriate numerical flux. The mass and energy conserving laws for the semi-discrete formulation can be proved based on different choices of numerical fluxes such as the central, alternative and upwind-based flux. We will propose two kinds of time discretization methods for the semi-discrete formulation. One is based on Crank-Nicolson method and can be proved to preserve the discrete mass and energy conservation. The other one is Krylov implicit integration factor(IIF) method which demands much less computational effort. Various numerical experiments are presented to demonstrate the conservation law of mass and energy, the optimal rates of convergence, and the blow-up phenomenon.

关键词： discontinuous Galerkin method nonlinear Schrdinger equation conservation Krylov implicit integration factor method

Antibacterial behavior and related mechanisms of martensitic Cu-bearing stainless steel evaluated by a mixed infection model of Escherichia coli and Staphylococcus aureus in vitro

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Journal of Materials Science & Technology 2021年第3期62卷 139-147页

作者： mingjun li li Nan Chunyong liang Ziqing Sun Lei Yang Ke Yang Center for Health Science and Engineering School of Materials Science and EngineeringHebei University of TechnologyTianjin 300130China Institute of Metal Research University of Chinese Academy of SciencesShenyang 110016China International Research Center for Translational Orthopaedics(IRCTO) China

Escherichia coli(***)and Staphylococcus aureus(***)are the most typical pathogenic bacteria with a significantly high risk of bio-contamination,widely existing in hospital and public *** studies on antibacterial materials and the related mechanisms have attracted more interests of ***,the antibacterial behavior of materials is usually evaluated separately on the single bacterial strain,which is far from the practical ***,the interaction between the polymicrobial communities can promote the growing profile of bacteria,which may weaken the antibacterial effect of *** this work,a 420 copper-bearing martensitic stainless steel(420 CuSS)was studied with respect to its antibacterial activity and the underlying mechanism in a co-culturing infection model using both *** and *** *** via plating and counting colony forming units(CFU),Cu releasing,and material characterization,420 CuSS was proved to present excellent antibacterial performance against the mixed bacteria with an approximately 99.4%of antibacterial *** addition,420 CuSS could effectively inhibit the biofilm formation on its surfaces,resulting from a synergistic antibacterial effect of Cu ions,Fe ions,reactive oxygen species(ROS),and proton consumption of bacteria.

关键词： Mixed bacterial strains E.coli S.aureus 420 Cu-bearing stainless steel Antibacterial mechanism

Parameter Effects of the Potential‑Field‑Driven Model Predictive Controller for Shared Control

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Automotive Innovation 2023年第1期6卷 48-61页

作者： mingjun li Chao Jiang Xiaolin Song Haotian Cao State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan UniversityChangsha 410082China

Parameter effects of the potential-field-driven model predictive control(PF-MPC)method on performances of shared control systems during obstacles avoidance are *** PF-MPC controllers of autonomous driving and shared control systems are designed based on the constructed potential fields and model predictive control method,and the driver-vehicle dynamics and the driver-related costs are also considered in the design of the shared *** explore a potential approach of alleviating driver-automation conflicts of the shared control systems,different motion planning results generated by the PF-MPC controller are explored by adjusting effects of potential fields’parameters,which provides possibilities to decrease driver-automation conflicts between the planned trajectory and driver’s target ***,two case studies are designed to discuss different frameworks and parameters effects on shared control *** show that the proposed shared control frameworks considering driver-vehicle dynamics and the driver-related cost show better performances regarding driver-automation conflicts management and driving safety than the decentralized control *** the longitudinal normalized constant of potential fields parameters shows influences on the driver-automation conflicts management and driving safety performances of shared control.

关键词： PF-MPC method Potential field Parameter effect Driver-automation conflict

基于转录组测序的山药NBS-LRR家族基因鉴定和分析

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中国蔬菜 2024年第8期 47-57页

作者：李顺朋李朝闯王兰宁张昊王瑞飞李明军杨清香河南师范大学生命科学学院河南新乡453007 河南省农业微生物生态与技术国际联合实验室河南新乡453007 河南省道地药材保育及利用工程技术中心河南新乡453007

为了探究NBS-LRR类抗病基因在铁棍山药响应不同真菌侵染中的作用,通过同源克隆从山药基因组中扩增出NBS类基因DoRGA2和DoRGA4,RT-qPCR分析发现山药黑斑病病原真菌互隔交链孢和内生真菌耐盐青霉侵染会不同程度诱导DoRGA2和DoRGA4上调表... 详细信息

为了探究NBS-LRR类抗病基因在铁棍山药响应不同真菌侵染中的作用,通过同源克隆从山药基因组中扩增出NBS类基因DoRGA2和DoRGA4,RT-qPCR分析发现山药黑斑病病原真菌互隔交链孢和内生真菌耐盐青霉侵染会不同程度诱导DoRGA2和DoRGA4上调表达。同时,利用转录组测序分析互隔交链孢和耐盐青霉侵染山药愈伤组织后的NBS-LRR家族基因,结果共鉴定到47个山药NBS-LRR家族基因,包括N、NL、CN、CNL和TN 5种类型,分别有25、15、3、3、1个基因;不同亚家族NBS-LRR蛋白的进化路径存在差异,且这些NBS-LRR类蛋白以酸性为主,普遍具有亲水性,主要定位在细胞膜或细胞质。这些NBS-LRR家族基因中,TRINITY_DN9146_c0_g1、TRINITY_DN8009_c1_g1、TRINITY_DN49830_c0_g1和TRINITY_DN39475_c0_g1在接种互隔交链孢后显著上调表达,而TRINITY_DN18700_c0_g3在接种耐盐青霉菌后显著上调。

关键词：山药 NBS-LRR基因互隔交链孢黑斑病 RNA-seq

明挖卸荷施工对下卧既有地铁盾构隧道的影响研究

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现代城市轨道交通 2024年第1期 119-124页

作者：李明君孙庆文陈小飞中铁第六勘察设计院集团有限公司天津300131 济南轨道交通集团有限公司山东济南250101

为研究明挖卸荷施工对下卧既有地铁盾构隧道的影响,文章以济南某明挖基坑近接既有地铁隧道为背景,基于midas GTS NX有限元软件,考虑3个方面因素并假设28种对比工况,开展数值模拟对比分析。得到不同因素影响下明挖卸荷施工对下卧既有地... 详细信息

为研究明挖卸荷施工对下卧既有地铁盾构隧道的影响,文章以济南某明挖基坑近接既有地铁隧道为背景,基于midas GTS NX有限元软件,考虑3个方面因素并假设28种对比工况,开展数值模拟对比分析。得到不同因素影响下明挖卸荷施工对下卧既有地铁盾构隧道影响规律,并提出相应的建议措施。研究结果表明,明挖基坑与既有隧道夹角保持在45°及以上,可降低明挖卸荷施工对既有隧道的影响;明挖基坑与既有隧道竖向距离在0.5D(D为隧道直径)以上时,竖向距离对于控制隆起变形效果较为明显;在0.5D以下时,竖向距离对于控制隆起变形并不明显;明挖基坑横向卸荷面积对既有地铁隧道竖向变形影响随基坑加宽或加深而呈线性增加,基坑深度因素影响尤为显著。

关键词：地铁近接盾构隧道明挖卸荷有限元数值模拟研究

大兴安岭东麓阿荣旗地区黑土地地表基质分布特征及成因

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地质论评 2024年第S1期70卷 305-306页

作者：李瑞红李明军刘航杨永赵凯明王学文公为鑫中国地质调查局廊坊自然资源综合调查中心河北廊坊065000

地表基质可以看作是地球的“皮肤”,它是山水林田湖草沙自然资源综合体在立体空间的基本纽带,其物质组成涵盖了地表自然资源产生、发育、演化和利用的全过程,因此是孕育和支撑了森林、草原、水等各类自然资源的基础物质(侯红星等,2022)... 详细信息

地表基质可以看作是地球的“皮肤”,它是山水林田湖草沙自然资源综合体在立体空间的基本纽带,其物质组成涵盖了地表自然资源产生、发育、演化和利用的全过程,因此是孕育和支撑了森林、草原、水等各类自然资源的基础物质(侯红星等,2022)。地表基质是自然作用的产物,同时与人类活动也息息相关。当前,按照地表基础物质的肉眼可见的物质形态,将地表基质划分为岩石、砾质、土质、泥质4个一级分类.

关键词：大兴安岭阿荣旗地表基质成因

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悬索桥主缆与索鞍间侧向传力的数值分析

西南科技大学学报 2024年第2期39卷 68-73页

作者：王路谭正军古松李明骏西南科技大学土木工程与建筑学院四川绵阳621010 四川振通检测股份有限公司四川绵阳621000

悬索桥主缆与索鞍间依靠挤压接触维持联结,但目前缆-鞍间侧向传力机制不明导致结构设计困难。构建了鞍槽内足量钢丝离散体的数值分析模型,并据此开展了关键参数影响分析。结果表明:侧向压力随深度表现出负指数型收敛分布,底部钢丝因槽... 详细信息

悬索桥主缆与索鞍间依靠挤压接触维持联结,但目前缆-鞍间侧向传力机制不明导致结构设计困难。构建了鞍槽内足量钢丝离散体的数值分析模型,并据此开展了关键参数影响分析。结果表明:侧向压力随深度表现出负指数型收敛分布,底部钢丝因槽底的支撑作用会出现侧向压力骤减;钢丝的排列方式对侧向力影响明显,细长排列会减小对应深度的侧向压力,但会增加总体侧向力;摩擦系数越大,侧向压力越小,显示出明显的负相关关系;在常规范围内设定钢丝的弹性模量及泊松比对侧向力影响微小。研究结果可为悬索桥索鞍结构设计及抗滑稳定性验算提供参考。

关键词：悬索桥主缆索鞍侧向力数值分析

基于炎症及糖类抗原125建立术前预测子宫内膜癌病理分期及分级的列线图预测模型

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国际老年医学杂志 2024年第5期45卷 559-565页

作者：荆芳芳李明军吕欣欣赤峰学院附属医院妇二科赤峰024050

目的探讨炎症指标、糖类抗原125(CA125)对术前子宫内膜癌(EC)病理分期及分级的预测价值。方法选取2021-2023年收治的214例EC患者作为研究对象,随机分为训练集(134例)与验证集(80例),测定炎症指标[中性粒细胞与淋巴细胞的比值(NLR)、血... 详细信息

目的探讨炎症指标、糖类抗原125(CA125)对术前子宫内膜癌(EC)病理分期及分级的预测价值。方法选取2021-2023年收治的214例EC患者作为研究对象,随机分为训练集(134例)与验证集(80例),测定炎症指标[中性粒细胞与淋巴细胞的比值(NLR)、血小板与淋巴细胞的比值(PLR)、全身免疫炎症指数(SII)]、CA125水平,评估训练集EC患者病理分期及分级,比较不同病理分期及分级患者炎症指标、CA125水平差异,利用R软件建立列线图预测模型,并由验证集验证,分析炎症指标、CA125对术前EC病理分期及分级的预测价值。结果训练集中TNM病理分期Ⅰ期120例、Ⅱ期4例、Ⅲ期10例,国际妇产科联盟(FIGO)分级1级16例、2级79例、3级39例。TNM病理分期Ⅱ、Ⅲ期的EC患者NLR、PLR、CA125均高于TNM病理分期Ⅰ期的患者(P0.90,有较高的预测价值。结论基于炎症及CA125建立的列线图预测模型对术前EC的病理分期及分级具有较高的预测价值。

关键词：子宫内膜癌炎症糖类抗原125 病理分期病理分级列线图预测价值

Overexpression of MdFRK2 enhances apple drought resistance by promoting carbohydrate metabolism and root growth under drought stress

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Horticultural Plant Journal 2023年第5期9卷 884-897页

作者： Jingjing Yang Ruiling Zhan Lan Wang Junqiao li Baiquan Ma Fengwang Ma mingjun li Key Laboratory of Molecular Module-Based Breeding of High Yield and Abiotic Resistant Plants in Universities of Shandong College of AgricultureLudong UniversityYantaiShandong 264025China State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple College of HorticultureNorthwest A&F UniversityYanglingShaanxi 712100China Key Laboratory of Fruit Tree Research in Ganzi Academy of Agricultural Sciences KangdingSichuan 626000China

Soluble sugars function not only as the energy and structural blocks supporting plants,but also as osmoregulators and signal molecules during plant adaptation to water ***,we investigated drought resistance in transgenic apple(Malus×domestica)overexpressing MdFRK2,a key gene regulating fructose content and sugar *** is no obvious phenotypic difference between MdFRK2-overexpressing transgenic plants and WT plants under the well-watered ***,the transgenic plants and the grafted plants using MdFRK2-overexpressing rootstock exhibited improved tolerance to drought *** of MdFRK2 significantly promoted the growth of root system under drought *** sequencing showed that under drought stress,genes involved in sugar metabolism,transcription regulation,signal transduction or hormone metabolism were differentially expressed in MdFRK2 transgenic *** with the gene expression profile,the activities of enzyme(SDH,FRK and NI)involved in sugar metabolism in the roots of MdFRK2 transgenic plants were significantly higher than those of untransformed control plants after drought *** drought stress,overexpression of MdFRK2 promoted the accumulation of IAA,and decreased the contents of ABA and CK in apple root *** conclusion,these results suggest that MdFRK2 can promote the growth of apple roots under drought stress by regulating sugar metabolism and accumulation,hormone metabolism and signal transduction,and then resist drought stress.

关键词： Malus×domestica MdFRK2 Drought stress Sugar Auxin Signal transduction Transcriptome