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An eco-friendly and highly sensitive loofah@CF/CNT 3D piezoresistive sensor for human activity monitoring and mechanical cotrol

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Science China(Technological Sciences) 2022年第11期65卷 2667-2674页

作者： ZHU Jie SONG YongTao xue xiaofei LIU ZhiLong MAO QingYuan JIA ZhenHua School of Computer Science and Engineering North China Institute of Aerospace EngineeringLangfang 065000China

Three-dimensional(3D)porous piezoresistive sensors are widely used because of their simple fabrication and convenient signal ***,because of the dependence on organic skeleton materials and the complexity of conductive coating preparation,the electrical and mechanical properties of 3D wearable piezoresistive sensors have gradually failed to accommodate many emerging ***,a new flexible 3D piezoresistive sensor(NF3PS)with high sensitivity and a wide measurement range is proposed,which comprises a natural porous loofah as a flexible framework and carbon fiber/carbon nanotube(CF/CNT)multiscale composite as a conductive *** of cellulose and lignin,the irregular,porous loofah has excellent mechanical strength,elasticity,and toughness,ensuring a repeated compression/recovery behavior of the *** addition,compared with the single-size carbon coating,the coupling of multiscale CF/CNT composite coating improves sensitivities over a range of *** NF3PS demonstrates a sensitivity of 6.94 kPa^(-1) with good linearity in the pressure range of 0–11.2 kPa and maintains a sensitivity of 0.28 kPa^(-1) in an ultrawide measurement range of 11.2–84.6 *** flexibility,robustness,and wide-ranging linear resistance variation,the feasibility of the NF3PS in human activity monitoring,mechanical control,and smart homes is *** work provides a novel strategy for a new generation of 3D flexible pressure sensors for improving sensitivity and measurement range and demonstrates attractive applications in wearable sensors.

关键词： 3D piezoresistive sensor loofah framework CF/CNT multiscale composite high sensitivity human activity monitoring mechanical control

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The Hemodynamic Study on the Effects of Entry Tear and Coverage in Aortic Dissection

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Computer Modeling in Engineering & Sciences 2019年第12期121卷 929-945页

作者： Zhenxia Mu xiaofei xue Minrui Fu Dawei Zhao Bin Gao Yu Chang School of Life Science and BioEngineering Beijing University of TechnologyBeijing100124China

In this work,the hemodynamic effects of the type-A aortic dissection in different entry and covering entry tear positions were mainly *** provides a new method or idea in the field of the aortic dissection hemodynamics,and it is of profound significance to provide basic theoretical research on the development of aortic dissection in the aspect of clinical *** type-A aortic dissection models with different entry tear positions(Model 1:The entry tear was located at the entrance of the ascending aorta,Model 2:The entry tear was located at the starting position of the descending aorta)were reconstructed according to the computed tomography(CT)images of the *** our study,the thoracic aortic endovascular repair was simulated by covering the entry tear(Model 3).To clarify the hemodynamic effects of entry tear and coverage,the comparative study on the true lumen(TL)and false lumen(FL)blood flow patterns of three models were carried out *** velocity vector,flow ratio,pressure,time-averaged wall shear stress(TAWSS)and relative residence time(RRT)were calculated to evaluate the hemodynamic *** results of this work indicated that(I)the velocity of entry tear at the aorta entrance was higher;(II)The helical development of the TL and FL might be related to the helical nature of aortic arch;(III)The blood flow which passing the FL of Model 1,Model 2 and Model 3 in one cardiac cycle were approximately 26.63%,13.39%and 1%,respectively;(IV)The difference in intima wall pressure of the TL and FL were showed a strong pulsation;(V)The TAWSS distribution in TL and FL were completely different(the TAWSS in TL intima>8 Pa,the TAWSS in FL intima<4 Pa).In brief,the aortic morphology and location of the entry tear were found to have a significant effect on the hemodynamics of the aortic *** addition,the CFD method is used to obtain multi-dimensional hemodynamic information such as velocity field,pressure,TAWSS and RRT,which can help clinic

关键词： Computational fluid dynamics(CFD) aortic dissection hemodynamic TEVAR

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The Hemodynamic Study on the Effects of Entry Tear and Coverage in Aortic Dissection

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医用生物力学 2019年第A1期34卷 87-88页

作者： Zhenxia Mu xiaofei xue Minrui Fu Dawei Zhao Bin Gao Yu Chang College of Life Science and Bioengineering Beijing University of Technology

Nowadays,cardiovascular disease has gradually become the number one killer of human *** Stanford type-A aortic dissection is a relatively common cardiovascular disease with potential *** disease is caused by a partialtearing of the aortic *** endovascular aortic repair(TEVAR)is one of the most effective treatment for type A aortic dissection and has been widely used clinically to achieve thrombosis and reduce pressure by covering the incision tear in the ***,the effect of entry tear location on type-A aortic dissection and the prognosis of TEVAR intervention are *** this work,the hemodynamic effects of the type-A aortic dissection in different entry and covering entry tear position were mainly *** can provide a new method or idea in the field of the aortic dissection hemodynamics,which is of great significance to provide a basic theoretical research on the development of aortic dissection in the aspect of clinical *** type-A aortic dissection models with different entry tear positions(Model 1:the entry tear was located at the entrance of the ascending aorta,Model 2:the entry tear was located at the starting position of the descending aorta)were reconstructed according to the computed tomography(CT)images of the *** our study,the thoracic aortic endovascular repair was simulated by covering the entry tear(Model 3).Then,the semi-automatic adaptive technology HyperMeshl0.0(Altair HyperWorks,Troy,Ml,USA)mesh generator was used to generate the high-quality tetrahedral 3D *** clarify the hemodynamic effects of entry tear and coverage in aortic blood flow pattern,the comparative study on the true lumen(TL)and false lumen(FL)blood flow patterns of three models were carried out numerically(the time-dependent pulsatile waveform of pressure boundary conditions used at the aortic inlet were consistent with Rapezzis’s work,time-dependent pulsatile waveform of velocity at the descending aorta outlet and the time

关键词： computational fluid dynamics(CFD) aortic dissection hemodynamic TEVAR

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The regulatory network behind maize seed germination: Effects of temperature, water, phytohormones, and nutrients

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The Crop Journal 2021年第4期9卷 718-738页

作者： xiaofei xue Shangyi Du Fuchao Jiao Menghan Xi Aiguo Wang Haicheng Xu Qiqing Jiao Xin Zhang Hao Jiang Jingtang Chen Ming Wang College of Agronomy Qingdao Agricultural UniversityQingdao 266109ShandongChina Administrative Committee of Yellow River Delta Agri-High-Tech Industry Demonstration Zone Dongying 257347ShandongChina Shandong Institute of Pomology Tai’an 271000ShandongChina Jinan Fruit Research Institute All China Federation of Supply and Marketing Co-operativesJinan 250000ShandongChina Productivity Promotion Center of Zoucheng Jining 273500ShandongChina

Seed germination is the process by which an organism grows from a seed. It requires suitable conditions and environmental factors. Maize is one of the most important crops worldwide. Germination influences both final maize yield and quality. Seed germination is regulated by a complex gene network. It is also influenced by endogenous(phytohormones and nutrients) and exogenous(temperature and water)inputs, involving molecular networks only partly identified to date. This review describes current understanding of the influence of temperature, water, phytohormones, and nutrients in regulating maize seed germination, and indicates knowledge gaps that should be addressed.

关键词： Germination of maize seed Temperature Water Phytohormones Nutrients

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商业银行绿色供应链金融的实践思考:模式、问题及对策

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新金融 2022年第3期 41-47页

作者：薛小飞福建华通银行股份有限公司

绿色供应链金融是绿色金融理念植根于供应链金融的一个细分方向,是商业银行践行绿色发展理念的重要路径。国外绿色供应链金融以“绿色供应链+供应链金融”的组合模式为主,侧重于产业端;国内商业银行在开展绿色供应链金融方面进行了大量... 详细信息

绿色供应链金融是绿色金融理念植根于供应链金融的一个细分方向,是商业银行践行绿色发展理念的重要路径。国外绿色供应链金融以“绿色供应链+供应链金融”的组合模式为主,侧重于产业端;国内商业银行在开展绿色供应链金融方面进行了大量实践,但由于其依托产业的多样性和金融业务的特殊性,尚未形成公认的模式。总体上,我国绿色供应链金融业务存在发展模式粗放、动力不足和评价机制缺乏等方面的问题,制约了绿色供应链金融的发展。基于此,本文提出绿色银行、投研银行、数字银行和敏捷银行的建设思路,以推动绿色供应链金融发展。

关键词：供应链金融绿色金融碳达峰碳中和 ESG

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Research on New Algorithm of Droop Control

Research on New Algorithm of Droop Control

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第30届中国控制与决策会议

作者： xue xiaofei Li Hong Lv Zhipeng College of Automation Beijing Information Science & Technology University China Electric Power Research Institute

The grid-connected inverter has excellent characteristics based on the control strategy of virtual synchronization generator（VSG）. In this paper, the rotor rotation model is applied to the current droop and power drooping control algorithm, replacing the active/frequency adjustment and reactive/voltage regulation control strategies of virtual synchronous generators. Not only can the inverter have the damping and inertial characteristics of the virtual synchronous generator, while simplifying the control model. Finally, the algorithm is validated by Matlab/Simulink. The experimental results show that the proposed algorithm is feasible and effective, and the stability of the grid frequency and voltage is enhanced.

关键词： Virtual Synchronous Generator Current Droop Control Power Droop Control Inverter

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商业银行智慧供应链金融探究:产业、科技与金融

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科技广场 2022年第1期 49-58页

作者：薛小飞福建华通银行股份有限公司福建福州350004

智慧供应链金融是产业、科技和金融的结合体,三者缺一不可:产业是根基,科技是手段,金融是纽带。基于产业和科技协同的供应链金融得到大量实践,形成了全科技型、行业型和场景型的发展模式,与此同时产业平台主导的供应链金融起到了引领和... 详细信息

智慧供应链金融是产业、科技和金融的结合体,三者缺一不可:产业是根基,科技是手段,金融是纽带。基于产业和科技协同的供应链金融得到大量实践,形成了全科技型、行业型和场景型的发展模式,与此同时产业平台主导的供应链金融起到了引领和推动作用。目前,智慧供应链金融模式尚在探索实践中,产业链管控能力有限,成熟的合作机制缺乏。基于此,本文建议从产业集群层面、金融服务层面和政策支持层面对其加以优化改进。

关键词：供应链金融产业科技银行

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具有阻尼和惯性的电流下垂控制研究

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电力系统保护与控制 2018年第24期46卷 54-61页

作者：雪晓菲厉虹吕志鹏北京信息科技大学自动化学院北京100192 中国电力科学研究院北京100192

针对虚拟同步发电机控制策略的优良特性,研究了其在电流下垂控制中的应用。采用电流下垂控制算法取代虚拟同步发电机的有功/频率调节和无功/电压调节控制策略,保留其机械转动所具有的惯性和阻尼特性,舍弃其定子电气模块,使逆变器不仅具... 详细信息

针对虚拟同步发电机控制策略的优良特性,研究了其在电流下垂控制中的应用。采用电流下垂控制算法取代虚拟同步发电机的有功/频率调节和无功/电压调节控制策略,保留其机械转动所具有的惯性和阻尼特性,舍弃其定子电气模块,使逆变器不仅具有电流下垂控制的优越性能,而且具备虚拟同步发电机的阻尼和惯性特征,增强电网频率和电压幅值的稳定性。通过在电压/电流双闭环控制器中引入虚拟阻抗,提升并网逆变器的鲁棒性。仿真实验结果验证了所提出控制策略的可行性和有效性。

关键词：虚拟同步发电机电流下垂控制逆变器虚拟阻抗

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热弹耦合运动斜板振动特性研究

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机械科学与技术 2019年第12期38卷 1854-1860页

作者：郭旭侠薛晓飞宝鸡文理学院机械工程学院

分析无量纲运动速度、边长比、斜角,无量纲热弹耦合因子等参数对热弹耦合运动斜薄板振动特性的影响。以运动热弹耦合运动斜薄板为研究对象,基于弹性薄板小挠度弯曲理论,建立运动微分方程,采用微分求积法进行离散建立热弹耦合运动斜板的... 详细信息

分析无量纲运动速度、边长比、斜角,无量纲热弹耦合因子等参数对热弹耦合运动斜薄板振动特性的影响。以运动热弹耦合运动斜薄板为研究对象,基于弹性薄板小挠度弯曲理论,建立运动微分方程,采用微分求积法进行离散建立热弹耦合运动斜板的特征方程。得到了热弹耦合运动斜板前3阶模态的无量纲复频率与运动速度之间的关系曲线。结果表明,相同条件下,第1阶模态发散失稳的临界速度随着斜板角度的增加而减小,第1阶模态的发散失稳临界速度随着无量纲热弹耦合因子的增大而增大。

关键词：热弹耦合运动斜板微分求积法振动特性

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融合动态泊松网络与关系强度Deffuant模型的舆情演化研究

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情报科学 2023年第6期41卷 70-78页

作者：肖毅薛晓斐易明肖明华中师范大学信息管理学院湖北武汉430079 华中师范大学信息化办公室湖北武汉430079 华中师范大学语言与语言教育研究中心湖北武汉430079

【目的/意义】研究泊松网络的拓扑结构与舆情演化的内生性关系,将连接的关系强度作为控制因素考察对二者的影响,有助于更好理解舆情演化的内在机制。【方法/过程】在观点动力学Deffuant模型的基础上进行改进,通过引入关系强度并构建微... 详细信息

【目的/意义】研究泊松网络的拓扑结构与舆情演化的内生性关系,将连接的关系强度作为控制因素考察对二者的影响,有助于更好理解舆情演化的内在机制。【方法/过程】在观点动力学Deffuant模型的基础上进行改进,通过引入关系强度并构建微观层面的数学模型,探讨在演化过程中舆情与网络结构的相互影响。采用ABM研究范式,在基于Java的Repast平台构建加权泊松网络,跟踪不同参数组合下的仿真实验结果并分析演化过程。【结果/结论】有界信任范围对观点簇数量的形成起到决定性作用,由关系强度和观点值触发的网络结构之动态变化不会对舆情演化的最终结果造成颠覆性影响,仅仅改变其演化的速度和节奏。【创新/局限】从关系强度视角构建了动态泊松网络,并在此基础上观察舆情演化的结果。对个体和舆情网络刻画的不够充分,可以融入个体异质性(心理、记忆等方面)、意见领袖、社团结构等因素,提升与现实网络的拟合度。

关键词： Deffuant模型舆情传播关系强度动态网络泊松网络

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