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Static output feedback stabilization for systems with time-varying delay based on a matrix transformation method

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Science China(Information Sciences) 2015年第1期58卷 188-200页

作者： liu zhen wei ZHANG HuaGuang SUN QiuYe College of Information Science and Engineering Northeastern University State Key Laboratory of Synthetical Automation for Process Industries Northeastern University

This paper is concerned with the problem of static output feedback stabilization for linear systems with time-varying delay. A novel controller design is proposed based on a matrix transformation method with a new equation condition, which can solve the controller gain more easily and avoid complicated calculations of the non-linear matrix inequality. Then, the corresponding criteria can be obtained by combining the matrix transformation method and the ideas of non-uniformly dividing delay interval, which can guarantee the asymptotic stability of the closed-loop systems and calculate the satisfactory controller gain. Finally, two numerical examples are provided to verify the effectiveness of the proposed design scheme.

关键词： static output feedback matrix transformation method time-varying delay non-uniformly dividing delay interval equation condition

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基于微波加热的沥青混合料自愈合性能研究

公路交通科技 2024年第9期41卷 60-70页

作者：赵毅刘威震张庆宇翟晓静张新永重庆交通大学交通土建工程材料国家地方联合工程实验室重庆交通大学材料科学与工程学院重庆交通大学土木工程学院河北交通职业技术学院河北迁曹高速公路开发有限公司

微波加热作为一种全新的体积加热形式,因其快速、均匀和节能的加热特性,已广泛应用于食品、陶瓷等行业,但在道路早期养护领域尚处于探索研究阶段。本研究归纳了基于微波加热的沥青混合料自愈合性能研究进展,针对沥青材料自愈合理论、微... 详细信息

微波加热作为一种全新的体积加热形式,因其快速、均匀和节能的加热特性,已广泛应用于食品、陶瓷等行业,但在道路早期养护领域尚处于探索研究阶段。本研究归纳了基于微波加热的沥青混合料自愈合性能研究进展,针对沥青材料自愈合理论、微波加热机理、微波加热材料、微波加热沥青混合料自愈合影响因素等方面研究现状进行了总结。综述分析表明:由于沥青成分、微观结构以及复杂的相互作用,沥青材料的愈合机制尚未完全清楚,但裂缝表面分子扩散理论、裂缝表面能理论和毛细流动理论在一定的限定条件下能够很好地表征沥青材料的自愈合特性;微波加热是一种高效、环保的沥青混合料自愈合热诱导形式,通过掺入钢屑、钢渣、炭黑、铁素体颗粒等微波加热材料,可提高沥青混合料的自愈合性能;沥青混合料的自愈合性能受到微波特性、沥青性能及沥青混合料类型、外部环境等因素的共同影响,外部环境对沥青混合料自愈合性能的影响最为显著,当超过最佳加热时间、含水率过高、损伤程度较大时,沥青混合料的自愈合性能显著下降。最后,从实际工程的角度,分析了微波加热沥青混合料自愈合性能工程应用面临的问题,并展望了其应用前景。

关键词：道路工程自愈合性能微波加热沥青混合料路面材料

富硒五谷虫粉对生长育肥猪生长性能、血清生化指标、屠宰性能和肉品质的影响

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饲料研究 2024年第5期47卷 21-25页

作者：邓志颖刘真卫王锦晖贺芳周锡红湖南农业大学动物科学技术学院湖南长沙410000 中国科学院亚热带农业生态研究所湖南长沙410000 亿海蓝尔(北京)生物科学研究院有限公司北京100000

试验探究了饲粮中添加不同剂量的富硒五谷虫粉对生长育肥猪生长性能、血清生化指标、屠宰性能和肉品质的影响。试验选用72头体况健康、体重21 kg左右60日龄“杜×长×大”生长育肥猪,随机分为3组,每组6个重复,每个重复4头猪。对照组饲... 详细信息

试验探究了饲粮中添加不同剂量的富硒五谷虫粉对生长育肥猪生长性能、血清生化指标、屠宰性能和肉品质的影响。试验选用72头体况健康、体重21 kg左右60日龄“杜×长×大”生长育肥猪,随机分为3组,每组6个重复,每个重复4头猪。对照组饲喂基础饲粮,0.1%组、0.2%组分别在基础饲粮中添加1 kg/t和2 kg/t的富硒五谷虫粉。试验期17周。结果显示,与对照组相比,饲粮添加0.1%富硒五谷虫粉可显著提高生长育肥猪的平均日增重(P<0.05);0.2%富硒五谷虫粉可以显著提高生长育肥猪血清免疫球蛋白A含量及谷胱甘肽过氧化物酶、超氧化物歧化酶的活性(P<0.05),显著降低血清丙二醛含量(P<0.05);饲粮添加0.1%、0.2%富硒五谷虫粉可增加生长育肥猪背最长肌中肌内脂肪、硒、亚油酸、α-亚油酸、花生酸、二十碳烯酸和二十碳二烯酸含量。研究表明,饲粮添加富硒五谷虫粉可以提高生长育肥猪的生长性能、免疫和抗氧化能力,改善猪肉的营养价值。

关键词：富硒五谷虫粉生长育肥猪抗氧化能力肉品质脂肪酸

Impact of Herbal Preparations on Outcomes of Highly Active Antiretroviral Therapy: A One-Year Prospective Cohort Study

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Chinese Journal of Integrative Medicine 2020年第7期26卷 497-501页

作者： SU Qi-jian SONG Ce LU zhen-zhen liu zhen-wei XIAO Jian WU Fa-sheng Center for AIDS Research Ruikang Hospital Affiliated to Guangxi University of Chinese MedicineNanning(530011)China Departme nt of Chronic Non comm un icable Disease Prevention and Control Guangxi Center for Disease Prevention and ControlNanning(530028)China School of Basic Medical Science Guangxi University of Chinese MedicineNanning(530200)China Department of Oncology Ruikang Hospital Affiliated to Guangxi University of Chinese MedicineNanning(530011)China

Objective:To investigate the impacts of two herbal preparations for human immunodeficiency virus/aquired immune deficiency syndrome(HIV/AIDS)patients,Shenling Fuzheng Capsule(参灵扶正胶囊,SLFZC)and Qingdu Capsule(清毒胶囊,QDC),on the efficacy of highly active antiretroviral therapy(HAART).Methods:HIV/AIDS patients met the criteria were all enrolled in a 1-year cohort study,in which patients receiving HAART alone were designated as Group A,those receiving HAART in combination with SLFZC were designated as Group B,and those receiving HAART in combination with QDC were designated as Group C,100 cases in each *** dose of SLFZC was 1.48 g(4 capsules),3 times daily,and QDC 1.56 g(4 capsules),3 times daily.T cell subsets,HIV RNA and HIV-1 drug resistance were detected at enrollment and 1 year after *** were followed up every 3 months,during which side-effects and other clinical data were ***:After 1-year treatment,the median increment in CD4 counts was 165.0,178.0 and 145.0 cells/μL for Group A,B and C,*** RNA was undetectable in 94%of patients in Group A,96%in Group B and 92%in Group *** were no differences regarding the increment in CD4 counts,HIV RNA and frequency of HIV-1 drug resistance *** of the 14 suspected side-effect symptoms,*** and dizziness,were lower in Groups B and C than in Group A(P<0.05,respectively).Conclusion:SLFZC and QDC do not have a negative impact on immunological and virological response to HAART;however,these preparations are not as potent in reducing HAART-associated side-effects as anticipated.

关键词： human immunodeficiency syndrome aquired immune deficiency syndrome Chinese medicine Shenling Fuzheng Capsule Qingdu Capsule

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铝合金缸盖低压铸造模具设计及凝固质量优化

铸造 2024年第8期73卷 1144-1150页

作者：陈晓斌谈毅杨安刘臻炜广州城市理工学院机械工程学院广东广州501800 贵州蓝辉新材料有限公司贵州遵义563000

针对摩托车发动机的铝合金单缸缸盖低压铸造成形时容易发生缩松、缩孔和气孔等缺陷问题,运用MAGMA软件模拟缸盖低压铸造过程温度和冷却率变化情况,预测缸盖容易产生的缺陷趋势及重点发生区域。在合理设计缸盖模具结构和侧模各部分冷却... 详细信息

针对摩托车发动机的铝合金单缸缸盖低压铸造成形时容易发生缩松、缩孔和气孔等缺陷问题,运用MAGMA软件模拟缸盖低压铸造过程温度和冷却率变化情况,预测缸盖容易产生的缺陷趋势及重点发生区域。在合理设计缸盖模具结构和侧模各部分冷却系统的同时,将数值模拟结果与智能化设备相结合应用,运用低压铸造机数字化智能技术进行凝固工艺过程的冷却时序控制和压力分段精细化控制,避免缸盖燃烧室重点区域凝固结晶时的缺陷发生,提高铝合金缸盖铸件内部组织成形致密度及低压铸造生产质量。

关键词：铝合金缸盖低压铸造缺陷预测智能设备

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万寿菊种子繁育基地病虫害综合防治技术研究

中国口岸科学技术 2024年第7期6卷 52-58页

作者：王晓东王智亮张常弘刘玮琦刘振伟赤峰海关赤峰024000

本文通过对万寿菊种子繁育基地病虫害发生情况的研究,探索出一套包括物理防治方法、化学防治方法、生物防治方法的防治技术,并通过田间试验对防治效果进行评估。结果表明,该防治技术效果明显,能够从源头上降低万寿菊种子携带有害生物风... 详细信息

本文通过对万寿菊种子繁育基地病虫害发生情况的研究,探索出一套包括物理防治方法、化学防治方法、生物防治方法的防治技术,并通过田间试验对防治效果进行评估。结果表明,该防治技术效果明显,能够从源头上降低万寿菊种子携带有害生物风险,提升海关监管效能,筑牢国门生物安全屏障。

关键词：万寿菊种子种子繁育基地病虫害综合防治技术

Data and Model Driven Task Offloading Strategy in the Dynamic Mobile Edge Computing System

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Journal of Systems Science & Complexity 2024年第1期37卷 351-368页

作者： DONG Hairong WU wei SONG Haifeng liu zhen ZHANG Zixuan School of Electronic and Information Engineering Beijing Jiaotong UniversityBeijing 100044China School of Electronic and Information Engineering BeiHang UniversityBeijing 100191China CRSC Research&Design Institute Group Co. Ltd.Beijing 100070China

Mobile Edge Computing(MEC)provides communication and computational capabilities for the industrial Internet,meeting the demands of latency-sensitive ***,traditional model-driven task offloading strategies face challenges in adapting to situations with unknown network communication status and computational *** limitation becomes notably significant in complex industrial networks of high-speed *** by these considerations,a data and model-driven task offloading problem is proposed in this paper.A redundant communication network is designed to adapt to anomalous channel states when tasks are offloaded to edge *** link switching mechanism is executed by the train according to the attributes of the completed *** task offloading optimization problem is formulated by introducing data-driven prediction of communication states into the traditional ***,the optimal strategy is achieved by employing the informer-based prediction algorithm and the quantum particle swarm optimization method,which effectively tackle real-time optimization problems due to their low time *** simulations illustrate that the data and model-driven task offloading strategy can predict the communication state in advance,thus reducing the cost of the system and improving its robustness.

关键词： Data driven model informer mobile edge computing quantum particle swarm optimization task offloading.

Delay-dependent Stability for Systems with Fast-varying Neutral-type Delays via a PTVD Compensation

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自动化学报 2010年第1期36卷 147-152页

作者： liu zhen-wei ZHANG Hua-Guang Key Laboratory of Integrated Automation for the Process Industry Ministry of Education Shenyang 110004 P.R. china College of Information Science and Engineering Northeastern University Shenyang 110004 P.R. China

The stability for a class of linear neutral systems with time-varying delays is studied in this paper,where delay in neutral-type term includes a fast-varying case(i.e.,the derivative of delay is more than one),which has never been considered in current *** less conservative delaydependent stability criteria for this system are proposed by applying new Lyapunov-Krasovskii functional and novel polynomials with time-varying delay(PTVD)compensation *** aim to deal with systems with fast-varying neutral-type delay can be achieved by using the new *** benefit brought by applying the PTVD compensation technique is that some useful elements can be included in criteria,which are generally ignored when estimating the upper bound of derivative of Lyapunov-Krasovskii functional.A numerical example is provided to verify the effectiveness of the proposed results.

关键词：稳定性稳定标准时滞补偿技术线性中立系统

Revisiting the island of hexadecapoledeformation nuclei in the A≈150 mass region:focusing on the model application to nuclear shapes and masses

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Communications in Theoretical Physics 2024年第2期76卷 74-88页

作者： Xiao-Yang wei Hua-Lei Wang zhen-zhen Zhang Min-Liang liu School of Physics and Microelectronics Zhengzhou UniversityZhengzhou 450001China Key Laboratory of High Precision Nuclear Spectroscopy Institute of Modern PhysicsChinese Academy of SciencesLanzhou 730000China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China

Based on the potential-energy-surface calculation,the impact of different deformation degrees of freedom on a single-particle structure and binding energies in nuclei around^(152)Nd,located on one of the hexadecapole-deformation islands,is analyzed in a multi-dimensional deformation *** energy maps,curves and tables are presented to indicate nuclear *** calculated equilibrium deformations and binding energies with different potential parameters are compared with experimental data and other *** is found that the inclusion of the hexadecapole deformations,especially the axial one,can improve the theoretical description of both nuclear shapes and *** addition,our calculated potential-energy curve shows that a critical deformation-point,β_(2)≈0.4,exists—the triaxial(hexadecapole)deformation effect can be neglectable but the hexadecapole(triaxial)one plays an important role before(after)such a critical point.

关键词： hexadecapole deformation binding energy potential-energy-surface calculation nuclear property