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Giant Flexoelectric Effect in Snapping Surfaces Enhanced by Graded Stiffness

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Acta Mechanica Solida Sinica 2024年第4期37卷 528-540页

作者： Chuo zhao Department of Aeronautics Imperial College LondonSouth Kensington CampusLondonSW72AZUK

Flexoelectricity is present in nonuniformly deformed dielectric materials and has size-dependent properties, making it useful for microelectromechanical systems. Flexoelectricity is small compared to piezoelectricity;therefore, producing a large-scale flexoelectric effect is of great interest. In this paper, we explore a way to enhance the flexoelectric effect by utilizing the snap-through instability and a stiffness gradient present along the length of a curved dielectric plate. To analyze the effect of stiffness profiles on the plate, we employ numerical parameter continuation. Our analysis reveals a nonlinear relationship between the effective electromechanical coupling coefficient and the gradient of Young’s modulus. Moreover, we demonstrate that the quadratic profile is more advantageous than the linear profile. For a dielectric plate with a quadratic profile and a modulus gradient of − 0.9, the effective coefficient can reach as high as 15.74 pC/N, which is over three times the conventional coupling coefficient of piezoelectric material. This paper contributes to our understanding of the amplification of flexoelectric effects by harnessing snapping surfaces and stiffness gradient design.

关键词： Functionally graded material Flexoelectricity Numerical continuation Snap-through instability

丹红注射液联合稳心颗粒治疗老年心律失常疗效观察

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中国药物经济学 2014年第3期9卷 44-45页

作者：吕蒙赵长毅同济大学医学院上海200092 上海市东海老年护理医院上海201303

目的观察丹红注射液联合稳心颗粒治疗老年心律失常的有效性和安全性。方法将68例患者随机分为治疗组和对照组各34例,治疗组用丹红注射液20ml加入5%葡萄糖注射液250ml静脉滴注,同时加服稳心颗粒。对照组服胺碘酮,按病情调整剂量4周为一... 详细信息

目的观察丹红注射液联合稳心颗粒治疗老年心律失常的有效性和安全性。方法将68例患者随机分为治疗组和对照组各34例,治疗组用丹红注射液20ml加入5%葡萄糖注射液250ml静脉滴注,同时加服稳心颗粒。对照组服胺碘酮,按病情调整剂量4周为一个疗程。观察治疗后24h动态心电图、临床症状改善和不良反应发生情况。结果心律失常总有效率治疗组为88.2%,对照组为79.4%,差异有统计学意义(P<0.05):临床症状改善总有效率治疗组为91.1%,对照组为73.5%,差异有统计学意义(P<0.05)。不良反应治疗组低于对照组,差异有统计学意义(P<0.05)。结论丹红注射液联合稳心颗粒治疗老年心律失常疗效显著,安全性好。

关键词：丹红注射液稳心颗粒心律失常疗效

One dimensional CeO_(2) nanorods/poly(ethylene oxide) solid composite electrolyte for all-solid-state lithium-ion batteries

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Journal of Rare Earths 2024年第3期42卷 570-577,I0005页

作者： Yudi Guo Erqing zhao Xiaofang zhao Shuailei Liu School of Chemistry and Materials Engineering Xinxiang UniversityXinxiang453003China School of Chemistry and Chemical Engineering Henan Institute of Science and TechnologyXinxiang453003China

The research of poly(ethylene oxide)(PEO)-based solid composite electrolyte with high ionic conductivity and excellent interfacial stability is the key to the development of all-solid-state lithium-ion batteries(ASSLIBs). Herein, uniform nanorod structured CeO_(2) fillers were controllably synthesized by electrospinning, which were subsequently filled into PEO polymer to prepare CeO_(2)/PEO solid composite electrolyte. The addition of CeO_(2) nanorods can reduce both the glass transition temperature and the melting point of PEO polymer, and also interact with PEO and lithium bis(trifluoromethanesulphonyl)imide(LITFSI) by Lewis acid—base reaction. Therefore, the solid composite electrolyte exhibits a high ionic conductivity of 4.52 × 10^(-4)S/cm, a wide electrochemical stability window of about 4.8 V, and a good interfacial stability with Li at 55℃. Moreover, the LiFePO_4/Li ASSLIB divulges the discharging specific capacity of 165, 162, 156 and 146 mA,h/g at 0.2, 0.5, 1 and 2 C, respectively, and achieves the capacity retention of 90.3% after 150 cycles at 0.5 C. Consequently, one dimensional CeO_(2) nanorods can be considered as an alternative filler for polymeric solid electrolyte.

关键词： Poly(ethylene oxide) Solid composite electrolyte CeO_(2)nanorods Ionic conductivity Rare earths

Types of Organic Fades and Source Rock Assessment of the Coal-Measure Mudstone in the Turpan-Hami Basin

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Acta Geologica Sinica(English Edition) 1998年第2期72卷 169-179页

作者： zhao changyi, DU Meili, SHAO Longyi, CHEN Jianping,CHENG Kerning and HE ZhonghuaResearch Institute of Petroleum Exploration and Development,China National Petroleum Corporation, 20 Xueyuan Rd., Beijing 100083Beijing Graduate School of China University of Mining and Technology,11 Xueyuan Rd., Beijing 100083

This paper discusses the enviromental characteristics of carbonaceous mudstone and mudstone (coal-measure mudstone in short) of the Early and Middle Jurassic in the Turpan-Hami basin, which were formed in swamps. Through the organic facies study of the coal-measure mudstone in this area, the authors clarify that the flowing-water swamp is the most advanced organic facies belt. Furthermore, according to the practical materials of coal-measure mudstone in the area and with the evaluation criteria of lacustrine mudstone in the past, the authors have established the integrated symbol systems from the abundance of organic matter and the type of organic matter, which can be used in the source rock evaluation of the coal-measure mudstone.

关键词： hydrocarbon from coal coal-measure mudstone organic facies source rock assessment Turpan-Hami basin

The trajectory of rice from wild to domesticated:A new chapter in the study of origins of agriculture

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Science China Earth Sciences 2024年第9期67卷 3011-3012页

作者： Zhijun zhao Institute of Cultural Heritage Shandong UniversityQingdao 266237China

Rice(Oryza sativa)is one of the most important food crops in the world today,feeding more than one-third of the global *** domestication of rice has always been an international research topic(Gross and zhao,2014).When,where,and how rice was cultivated and eventually domesticated has been a hot issue in many research fields such as archaeology,biology,and agronomy(Fuller et al.,2009).

关键词： sativa Oryza crops

大国重器研制的关键核心技术突破——东方电气集团G50重型燃气轮机纵向案例研究

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管理世界 2023年第12期39卷 20-37页

作者：赵长轶谢洪明郭勇孔祥林四川大学商学院广州大学管理学院东方电气集团东方汽轮机有限公司

大国重器关键核心技术的创新管理研究具有鲜明的中国特色和紧迫的现实意义。后发国家的企业在大国重器研制中实现关键核心技术突破,往往受制于技术基础和吸收能力不足而困难重重。如何通过发挥组织印记与资源编排的动态耦合作用破解关... 详细信息

大国重器关键核心技术的创新管理研究具有鲜明的中国特色和紧迫的现实意义。后发国家的企业在大国重器研制中实现关键核心技术突破,往往受制于技术基础和吸收能力不足而困难重重。如何通过发挥组织印记与资源编排的动态耦合作用破解关键核心技术突破难题成为关键。本文通过对东方电气集团的G50重型燃气轮机研制的纵向案例研究,分析了组织印记与资源编排在大国重器核心技术的创新管理中的动态耦合关系,提出了中国企业突破大国重器关键核心技术的过程演进模型。本文探索了特定组织印记的能动作用、演化过程及与资源编排的多阶段动态耦合机理,识别出企业在印记能动作用下实现大国重器关键核心技术突破的3种资源编排方式,对处在新发展阶段的中国企业强化创新主体地位、提升关键核心技术攻关能力具有启示意义。

关键词：大国重器关键核心技术印记资源编排创新管理

A DIRECT DISCONTINUOUS GALERKIN METHOD FOR TIME FRACTIONAL DIFFUSION EQUATIONS WITH FRACTIONAL DYNAMIC BOUNDARY CONDITIONS

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Journal of Computational Mathematics 2024年第1期42卷 156-177页

作者： Jingjun zhao Wenjiao zhao Yang Xu School of Mathematics Harbin Institute of TechnologyHarbin 150001China

This paper deals with the numerical approximation for the time fractional diffusion problem with fractional dynamic boundary *** well-posedness for the weak solutions is studied.A direct discontinuous Galerkin approach is used in spatial direction under the uniform meshes,together with a second-order Alikhanov scheme is utilized in temporal direction on the graded mesh,and then the fully discrete scheme is ***,the stability and the error estimate for the full scheme are analyzed in *** experiments are also given to illustrate the effectiveness of the proposed method.

关键词： Time fractional diffusion equation Numerical stability Convergence

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再论有机质“接力成气”的内涵与意义

石油勘探与开发 2011年第2期38卷 129-135页

作者：赵文智王兆云王红军李永新胡国艺赵长毅中国石油勘探与生产公司中国石油勘探开发研究院

有机质"接力成气"重点关注烃源岩中滞留液态烃在高—过成熟阶段的生气与成藏潜力,是指随热成熟度升高,干酪根降解生气转化为原油裂解生气,在主生气时机上构成接力过程。在增补生气动力学实验和气藏解剖研究基础上,研究发现:烃源岩在液... 详细信息

有机质"接力成气"重点关注烃源岩中滞留液态烃在高—过成熟阶段的生气与成藏潜力,是指随热成熟度升高,干酪根降解生气转化为原油裂解生气,在主生气时机上构成接力过程。在增补生气动力学实验和气藏解剖研究基础上,研究发现:烃源岩在液态窗阶段排烃以后的滞留烃数量相当高,在高—过成熟阶段可作为有效气源灶;滞留烃裂解生气主要发生于Ro值大于1.6%的高—过成熟阶段;滞留烃热裂解天然气可用甲基环己烷含量进行鉴别;高成岩环境下存在天然气有效排驱的通道、动力和过程,可规模形成源外常规气藏。有机质接力成气的意义体现在3方面:①对烃源岩中滞留液态烃生气与成藏贡献的关注;②对滞留液态烃主成气时机的确定;③对高—过成熟阶段滞留液态烃热裂解气"源外"天然气常规成藏潜力的评价。

关键词：有机质接力成气内涵生气母质页岩气滞留烃裂解气勘探

Conformation and Counterion Distribution of Polyelectrolyte in Solution as Viewed from Dielectric Approach

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Chinese Journal of Polymer Science 2024年第9期42卷 1278-1301,I0005页

作者： Kong-Shuang zhao College of Chemistry Beijing Normal UniversityBeijing 100875China

Polyelectrolyte solutions are more variable than uncharged macromolecule due to electrical interaction between charged molecules and surrounding ***,the subject of polyelectrolyte solutions has attracted a wide range of interests in both basic and applied research,and has also been extensively ***,the understanding of the molecular dynamics and conformation of polyelectrolytes in solution remains to be deepened,and universal consensus on some key issues have not been *** methods have contributed to solving the above problems in different ways,including dielectric relaxation spectroscopy(DRS).In this perspective,we briefly reviewed the history of dielectric spectroscopic research on polyelectrolyte solution,with emphasis on summarizing our *** particular,we expound the characteristics of DRS and its ability to obtain the internal information of the system of ***,we evaluate the advantages and limitations of the dielectric method and discussed future prospects of this field.

关键词： Polyelectrolyte Dielectric relaxation spectroscopy Chain conformation Thermosensitive microgel PNIPAM microgel Spherical polyelectrolyte brushes