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Journal of Computational Mathematics 2023年第2期41卷 224-245页

作者： Dongyang Shi houchao zhang School of Mathematics and Statistics Zhengzhou UniversityZhengzhou 450001China

The focus of this paper is on a linearized backward differential formula(BDF)scheme with Galerkin FEM for the nonlinear Klein-Gordon-Schrödinger equations(KGSEs)with damping mechanism.Optimal error estimates and superconvergence results are proved without any time-step restriction condition for the proposed scheme.The proof consists of three ingredients.First,a temporal-spatial error splitting argument is employed to bound the numerical solution in certain strong norms.Second,optimal error estimates are derived through a novel splitting technique to deal with the time derivative and some sharp estimates to cope with the nonlinear terms.Third,by virtue of the relationship between the Ritz projection and the interpolation,as well as a so-called"lifting"technique,the superconvergence behavior of order O(h^(2)+τ^(2))in H^(1)-norm for the original variables are deduced.Finally,a numerical experiment is conducted to confirm our theoretical analysis.Here,h is the spatial subdivision parameter,andτis the time step.

关键词： KGSEs with damping mechanism Linearized BDF Galerkin FEM Optimal error estimates Superconvergence

Microglia in brain aging:An overview of recent basic science and clinical research developments

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Journal of Biomedical Research 2024年第2期38卷 122-136页

作者： Haixia Fan Minheng zhang Jie Wen Shengyuan Wang Minghao Yuan houchao Sun Liu Shu Xu Yang Yinshuang Pu Zhiyou Cai Chongqing Medical University Chongqing 400042China Department of Neurology Chongqing General HospitalChongqing 400013China Chongqing Key Laboratory of Neurodegenerative Diseases Chongqing 400013China Department of Neurology the First Hospital of Shanxi Medical UniversityTaiyuanShanxi 030001China Department of Gerontology the First People's Hospital of JinzhongJinzhongShanxi 030009China

Aging is characterized by progressive degeneration of tissues and organs,and it is positively associated with an increased mortality rate.The brain,as one of the most significantly affected organs,experiences age-related changes,including abnormal neuronal activity,dysfunctional calcium homeostasis,dysregulated mitochondrial function,and increased levels of reactive oxygen species.These changes collectively contribute to cognitive deterioration.Aging is also a key risk factor for neurodegenerative diseases,such as Alzheimer's disease and Parkinson's disease.For many years,neurodegenerative disease investigations have primarily focused on neurons,with less attention given to microglial cells.However,recently,microglial homeostasis has emerged as an important mediator in neurological disease pathogenesis.Here,we provide an overview of brain aging from the perspective of the microglia.In doing so,we present the current knowledge on the correlation between brain aging and the microglia,summarize recent progress of investigations about the microglia in normal aging,Alzheimer's disease,Parkinson's disease,Huntington's disease,and amyotrophic lateral sclerosis,and then discuss the correlation between the senescent microglia and the brain,which will culminate with a presentation of the molecular complexity involved in the microglia in brain aging with suggestions for healthy aging.

关键词： microglia brain aging Alzheimer's disease Parkinson's disease Huntington's disease

SUPERCONVERGENCE ANALYSIS FOR TIME-FRACTIONAL DIFFUSION EQUATIONS WITH NONCONFORMING MIXED FINITE ELEMENT METHOD

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Journal of Computational Mathematics 2019年第4期37卷 488-505页

作者： houchao zhang Dongyang Shi School of Mathematics and Statistics Pingdingshan University Pingdingshan 467000 China School of Mathematics and Statistics Zhengzhou University Zhengzhou 450001 China

In this paper, a fully discrete scheme based on the LI approximation in temporal direction for the fractional derivative of order in (0,1) and nonconforming mixed finite element method (MFEM) in spatial direction is established. First, we prove a novel result of the consistency error estimate with order O(h^2)of EQ1^rot element (see Lemma 2.3). Then, by using the proved character of EQ1^rot element, we present the superconvergent estimates for the original variable u in the broken H^1-norm and the flux →p =△u in the (L^2)^2-norm under a weaker regularity of the exact solution. Finally, numerical results are provided to confirm the theoretical analysis.

关键词： Nonconforming MFEM LI method Time-fractional diffusion equations Superconvergence

Recent advances in nanofiber-based flexible transparent electrodes

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International Journal of Extreme Manufacturing 2023年第3期5卷 144-198页

作者： houchao zhang Xiaoyang Zhu Yuping Tai Junyi Zhou Hongke Li Zhenghao Li Rui Wang Jinbao zhang Youchao zhang Wensong Ge Fan zhang Luanfa Sun Guangming zhang Hongbo Lan Shandong Engineering Research Center for Additive Manufacturing Qingdao University of TechnologyQingdao 266520People’sRepublicofChina Key Laboratory of Additive Manufacturing and Applications in Universities of Shandong Qingdao University of TechnologyQingdao266520People’s Republic of China

Flexible and stretchable transparent electrodes are widely used in smart display,energy,wearable devices and other fields.Due to the limitations of flexibility and stretchability of indium tin oxide electrodes,alternative electrodes have appeared,such as metal films,metal nanowires,and conductive meshes.However,few of the above electrodes can simultaneously have excellent flexibility,stretchability,and optoelectronic properties.Nanofiber(NF),a continuous ultra-long one-dimensional conductive material,is considered to be one of the ideal materials for high-performance transparent electrodes with excellent properties due to its unique structure.This paper summarizes the important research progress of NF flexible transparent electrodes(FTEs)in recent years from the aspects of NF electrode materials,preparation technology and application.First,the unique advantages and limitations of various NF materials are systematically discussed.Then,we summarize the preparation technology of various advanced NF FTEs,and point out the future development trend.We also discuss the application of NFs in solar cells,supercapacitors,electric heating equipments,sensors,etc,and analyze its development potential in flexible electronic equipment,as well as problems that need to be solved.Finally,the challenges and future development trends are proposed in the wide application of NF FTEs in the field of flexible optoelectronics.

关键词： nanofiber flexible transparent electrodes additive manufacturing flexible optoelectronic devices

Additive Manufacturing of Large-scale Metal Mesh with Core-shell Composite Structure for Transparent Electromagnetic Shielding/glass Heater

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Chinese Journal of Mechanical Engineering(Additive Manufacturing Frontiers) 2023年第3期2卷 29-38页

作者： Yuping Tai Junyi Zhou Xiaoyang Zhu houchao zhang Hongke Li Zhenghao Li Rui Wang Fan zhang Guangming zhang Chaohong Liu Hongbo Lan Shandong Engineering Research Center for Additive Manufacturing Qingdao University of TechnologyQingdao266520China Key Laboratory of Additive Manufacturing and Applications in Universities of Shandong Qingdao University of TechnologyQingdao266520China Qingdao Virtual Reality Research Institute Co. Ltd.Qingdao266100China

Transparent electromagnetic(EM)shielding glass with a metal mesh has significant potential for application in different fields of EM radiation and anti-EM interference light-transmitting observation windows.In particular,a transparent EM-shielding glass with a large-aspect-ratio metal mesh can effectively alleviate the contradictory problems of shielding effectiveness and light-transmission performance constraints.However,the fabrication of high-aspect-ratio metal meshes on glass substrates has problems such as high cost,complex processes,low efficiency,small area,and easy damage issues,which limit their application in the field of high-performance,transparent EM-shielding glass.Therefore,this paper proposes a composite additive manufacturing process based on electric-field-driven microjet 3D printing and electroplating.By fabricating metal meshes with an Ag-Cu core-shell structure on a glass substrate,EM-shielding glass with high shielding efficiency and light transmission can be manufactured without increasing the aspect ratio of the metal meshes.The prepared Ag-Cu composite metal mesh has excellent optoelectronic properties(period 250𝜇m,line width 10𝜇m,90.1%transmission at 550 nm visible light,square resistance 0.21Ω/sq),efficient electrothermal effect(3 V DC voltage can reach 189°C steady-state temperature),stable EM-shielding effectiveness(average shielding effectiveness 23 dB at X-band),and acceptable mechanical and environmental stability(less than 3%change in square resistance after 150-times adhesion test and less than 6%and 0.6%change in resistance after 72 h in acid and alkali environments,respectively).This method provides a new solution for the mass production of high-performance large-area transparent electric heating/EM-shielding glass.

关键词： Transparent electromagnetic interference (EMI)shielding Composite metal mesh Shielding efficiency Optical transmittance Additive manufacturing

儿童青少年家庭功能障碍与心理健康关系的三水平元分析

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心理科学进展 2024年第5期32卷 771-789页

作者：文思雁于旭晨金磊宫俊如张晓函孙敬林张杉吕厚超西南大学心理学部中国社区心理学服务与研究中心心理学与社会发展研究中心西南大学时间心理学研究中心重庆400715

当家庭无法完成相应任务或家庭不具备良好的特征时,即为家庭功能障碍。家庭功能障碍是影响儿童青少年心理健康的重要因素,但两者关系存在争议。为了较为全面地理解家庭功能障碍(主观与客观)与儿童青少年心理健康(积极与消极)的关系,基... 详细信息

当家庭无法完成相应任务或家庭不具备良好的特征时,即为家庭功能障碍。家庭功能障碍是影响儿童青少年心理健康的重要因素,但两者关系存在争议。为了较为全面地理解家庭功能障碍(主观与客观)与儿童青少年心理健康(积极与消极)的关系,基于家庭系统理论和心理健康双因素模型,采用三水平元分析对两者关系进行探讨。检索和筛选2022年3月1日以前发表的文献,最终纳入97项研究,包括173个效应量和130227名被试。主效应检验发现,单亲通过损害积极心理健康状态、加剧消极心理健康状态影响儿童青少年,父母离异、父母服刑、父母物质滥用、父母患精神疾病、主观家庭功能障碍通过加剧消极心理健康状态影响儿童青少年。调节效应检验发现,单亲对男生心理健康的消极影响更大;集体主义背景下,父母服刑对儿童青少年心理健康的消极影响更大。研究结果不仅支持家庭系统理论,还提示需要给予家庭功能障碍儿童青少年的积极心理健康状态更多关注,并在关注文化背景的同时,根据性别差异进行精准干预。

关键词：儿童青少年家庭功能障碍心理健康三水平元分析

电场驱动复合微纳3D打印低频透明电磁屏蔽玻璃

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机械工程学报 2024年第3期60卷 305-318页

作者：台玉平朱晓阳李红珂于志浩张厚超张凡张广明赵娟赵佳伟黄友奇兰红波青岛理工大学山东省增材制造工程技术研究中心青岛266520 中国建筑材料科学研究总院有限公司北京100024

为解决大面积高性能低频透明电磁屏蔽玻璃难以低成本批量化制造的挑战性问题,提出一种基于电场驱动微喷射和电镀的复合增材制造新方法,用于制备银镍复合金属网栅低频透明电磁屏蔽玻璃,阐述了制备银镍复合金属网栅的基本原理和工艺流程;... 详细信息

为解决大面积高性能低频透明电磁屏蔽玻璃难以低成本批量化制造的挑战性问题,提出一种基于电场驱动微喷射和电镀的复合增材制造新方法,用于制备银镍复合金属网栅低频透明电磁屏蔽玻璃,阐述了制备银镍复合金属网栅的基本原理和工艺流程;通过实验揭示了主要工艺参数(打印电压、打印速度、打印气压、打印高度、电流密度、电镀时间)对制备银镍复合金属网栅电学性能、光学性能的影响规律;并结合优化的工艺参数,制备了线宽10μm、方阻0.76?/sq、网栅透过率90.2%、在低频波段(10 kHz~30 MHz)屏蔽效能大于40 dB的银镍复合金属网栅透明电磁屏蔽玻璃,复合金属网栅与衬底的黏附力为5B,实现了高屏蔽效能和高透过率电磁屏蔽金属网栅的制造,为高性能低频透明电磁屏蔽玻璃的批量化制造提供了全新的解决方案。

关键词：透明电磁屏蔽微纳3D打印复合金属网栅电场驱动喷射电镀

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重温旧事:怀旧的适应性作用及其解释

心理学探新 2023年第5期43卷 441-448页

作者：张杉吕厚超西南大学心理学部重庆400715

近年来,已有大量研究表明怀旧对个体心理和行为有着积极作用,如心理和生理健康、行为和认知等。怀旧的适应性作用影响广泛,关于怀旧的研究领域众多且发散。但是,目前还尚未有综述统合有关怀旧适应性的相关研究。因此,现有研究旨在系统... 详细信息

近年来,已有大量研究表明怀旧对个体心理和行为有着积极作用,如心理和生理健康、行为和认知等。怀旧的适应性作用影响广泛,关于怀旧的研究领域众多且发散。但是,目前还尚未有综述统合有关怀旧适应性的相关研究。因此,现有研究旨在系统梳理已有关于怀旧适应性的文献,并从社会认知基本维度的视角解释其心理机制。未来研究应进一步探究不同特质群体的怀旧差异以及怀旧的不同后果及其机制;还可以从社会认知的角度梳理怀旧及其作用,纳入相关变量厘清其中的作用机制。

关键词：怀旧情绪心理健康行为

平衡时间洞察力对智慧的影响:中庸思维的调节作用

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心理研究 2023年第4期16卷 310-316,323页

作者：李溪言吕厚超张志杰河北师范大学教育学院石家庄050024 西南大学心理学部西南大学时间心理学研究中心重庆400715

本研究为探讨大学生的平衡时间洞察力、中庸思维及智慧的关系,使用时间洞察力量表、中庸思维量表及三维智慧量表对本科生和硕士生进行调查,共回收404份有效问卷。结果表明:(1)时间洞察力显著正向预测智慧;(2)中庸思维显著正向预测智慧;... 详细信息

本研究为探讨大学生的平衡时间洞察力、中庸思维及智慧的关系,使用时间洞察力量表、中庸思维量表及三维智慧量表对本科生和硕士生进行调查,共回收404份有效问卷。结果表明:(1)时间洞察力显著正向预测智慧;(2)中庸思维显著正向预测智慧;(3)中庸思维在平衡时间洞察力与智慧之间起调节作用,存在一定增益效果,即时间洞察力越平衡的个体,如果中庸思维水平高,则其智慧水平也越高,这种变化主要体现在认知和情感两种成分上。这说明,在中国文化背景下,个体的平衡时间洞察力能够正向预测智慧,且中庸思维调节个体平衡时间洞察力和智慧之间的关系。

关键词：时间洞察力平衡时间洞察力中庸思维智慧

冻黏土界面层单调剪切数值模拟及实验对比分析

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森林工程 2022年第2期38卷 133-139页

作者：孙厚超马爱群杨平张飞盐城工学院土木工程学院江苏盐城224051 南京林业大学土木工程学院南京210037

为研究冻土界面层的单剪力学性质,基于有限元数值模拟技术(ABAQUS)软件Goodman单元,利用软件二次开发功能,自定义冻土界面层弹塑性损伤本构关系,建立基于冻土界面层剪切试验的有限元模型,实现冻土界面层的剪切试验数值模拟。通过数值模... 详细信息

为研究冻土界面层的单剪力学性质,基于有限元数值模拟技术(ABAQUS)软件Goodman单元,利用软件二次开发功能,自定义冻土界面层弹塑性损伤本构关系,建立基于冻土界面层剪切试验的有限元模型,实现冻土界面层的剪切试验数值模拟。通过数值模拟分析和试验对比得出:(1)冻土界面层有限元模型数值模拟剪切试验,将计算结果与试验进行对比,两者间具有一致性;(2)冻土界面层模拟剪切时,剪应力随剪位移达到峰值剪应力后过渡到平稳剪切阶段;模拟峰值剪应力、模拟稳定剪应力随着法向应力增大而增大,冻土界面层的模拟抗剪强度与法向应力具有较好的线性关系,可用摩尔-库仑理论描述;(3)结构面粗糙度、冻土温度和法向应力等因素对冻土界面层力学特性具有重要影响。研究结果对冻土界面层力学特性问题提供新的研究方法和路径。

关键词：接触界面层单调剪切冻黏土数值模拟物理试验