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Regulating photocatalytic overall water splitting of ferroelectric heterostructures by size effect

Nano Research 2024年第9期17卷 8000-8006页

作者： Zixing Ye Daifu Yu Ruian Zhang Fei Qin Yiran Sun Jie Huang Zhanqi Zhou He Tian Gaorong Han zhaohui ren Gang Liu State Key Laboratory of Silicon and Advanced Semiconductor Materials School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Center of Electron Microscopy School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China

In the past decade,ferroelectric materials have been intensively explored as promising *** intriguing ability of ferroelectrics is to directly sperate the photogenerated electrons and holes,which is believed to arise from a spontaneous *** how polarization affects the photocatalytic performance is vital to design high-efficiency *** this work,we report a size effect of ferroelectric polarization on regulating the photocatalytic overall water splitting of SrTiO_(3)/PbTiO_(3)nanoplate heterostructures for the first *** was realized hydrothermally by controlling the thickness and thus spontaneous polarization strength of single-crystal and single-domain PbTiO_(3)nanoplates,which served as the substrate for selective heteroepitaxial growth of SrTiO_(3).An enhancement of 22 times in the photocatalytic overall water splitting performance of the heterostructures has been achieved when the average thickness of the nanoplate increases from 30 to 107 nm.A combined experimental investigation revealed that the incompletely compensated depolarization filed is the dominated driving force for the photogenerated carrier separation within heterostructures,and its increase with the thickness of the nanoplates accounts for the enhancement of photocatalytic ***,the concentration of oxygen vacancies for negative polarization compensation has been found to grow as the thickness of the nanoplates increases,which promotes oxygen evolution reaction and reduces the stoichiometric ratio of H_(2)/O_(2).These findings may provide the opportunity to design and develop high-efficiency ferroelectric photocatalysts.

关键词： single-domain nanoplates size effect ferroelectric polarization screening photocatalytic overall water splitting

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生物阻抗谱参数提取算法研究

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科学技术创新 2024年第2期 98-102页

作者：任朝辉张博杨凌职业技术学院陕西咸阳

生物阻抗测量技术起源于生物电理论,其利用生物组织的电特性对人体信号提取和分析,用以进行一些生理、病理研究。根据生物细胞等效电路模型建立以各元件参数为求解变量的复阻抗-频率响应函数模型,通过对函数曲线回归求解实现等效电路拟... 详细信息

生物阻抗测量技术起源于生物电理论,其利用生物组织的电特性对人体信号提取和分析,用以进行一些生理、病理研究。根据生物细胞等效电路模型建立以各元件参数为求解变量的复阻抗-频率响应函数模型,通过对函数曲线回归求解实现等效电路拟合,采用非线性最小二乘法(NLS)思想,并引入遗传算法(GA)提供初始值估计减小拟合误差。

关键词：生物阻抗测量等效电路拟合曲线回归求解混合算法思想

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Vibration isolation performance analysis of a bilateral supported bio-inspired anti-vibration control system

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Applied Mathematics and Mechanics(English Edition) 2023年第5期44卷 759-772页

作者： Shihua ZHOU Dongsheng ZHANG Bowen HOU zhaohui ren School of Mechanical Engineering&Automation Northeastern UniversityShenyang 110819China

To achieve better anti-vibration performance in a low frequency region and expand the range of vibration isolation,a bilateral supported bio-inspired anti-vibration(BBAV)structure composed of purely linear elements is proposed,inspired by the motion form of bird legs and the nonlinear extension and compression of muscles and *** kinematic relations and nonlinear dynamic model considering vertical and rotational vibrations are *** loading capacity and equivalent stiffness are investigated with key *** amplitude-frequency characteristics and force transmissibility are used to evaluate the stability and anti-vibration performance with the effects of the excitation amplitude,rod length,installation angle,and spring *** results show that the loading requirements and resonant characteristics of the BBAV structure are adjustable,and superior vibration isolation performance can be achieved readily by tuning the *** X-shaped vibration structure is sensitive to the spring stiffness,which exhibits a wider vibration isolation bandwidth with smaller spring ***,depending on the parameters,the nonlinear behavior of the BBAV system can be interconverted between the softening type and the hardening *** theoretical analysis in this study demonstrates the advantages and effectiveness of the vibration isolation structure.

关键词： bio-inspired X-shaped structure anti-vibration performance force transmissibility loading capacity amplitude-frequency curve

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2个抗感烟草品种响应马铃薯Y病毒早期胁迫的转录组分析

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吉林农业大学学报 2024年第2期46卷 219-227页

作者：王平任雅萍任昭辉苏亮吴委林杨超群董环宇朴世领延边大学农学院延吉133002 呼伦贝尔市农牧科学研究所呼伦贝尔021000 吉林烟草工业有限责任公司长春130031

为探明烟草不同抗性品种NC95和SY04-3对马铃薯Y病毒(PVY)胁迫的响应差异,对烟草幼苗接种PVY,在12 h采集幼苗样本,进行转录组测序和生物信息学分析。结果表明:NC95上调差异表达基因有206个,下调111个;SY04-3上调差异表达基因有1001个,下... 详细信息

为探明烟草不同抗性品种NC95和SY04-3对马铃薯Y病毒(PVY)胁迫的响应差异,对烟草幼苗接种PVY,在12 h采集幼苗样本,进行转录组测序和生物信息学分析。结果表明:NC95上调差异表达基因有206个,下调111个;SY04-3上调差异表达基因有1001个,下调423个。这些差异表达基因的功能归类于生物过程、细胞组分及分子功能3大类54个GO条目,NC95和SY04-3上调差异表达基因显著富集在7条KEGG代谢通路中,而NC95和SY04-3下调差异表达基因分别显著富集在10条、14条KEGG代谢通路中;转录因子预测NC95有13个家族的20个转录因子发生显著变化,SY04-3有20个家族的38个转录因子发生了显著变化。

关键词：烟草马铃薯Y病毒转录组差异表达基因

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Optically Controlled Coercive Field of MAPbl_(3)/P(VDF-TrFE)Ferroelectric Composite Films

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Chemical Research in Chinese Universities 2023年第2期39卷 228-233页

作者： SU Yangfan SUN Yiran ZHOU Dikui TANG Xiaoming HAN Gaorong ren zhaohui State Key Laboratory of Silicon Materials School of Materials Science and EngineeringZhejiang UniversityHangzhou310027P.R.China Center of Electron Microscope School of Materials Science and EngineeringZhejiang UniversityHangzhou310027P.R.China Research Center for Humanoid Sensing Zhejiang LabHangzhou311100P.R.China

Ferroelectric polymers,such as poly(vinylidene fluoride-trifluoroethylene)[P(VDF-TrFE)or PVTF]have attracted growing interest in developing flexible devices because of their excellent ferroelectricity and *** coercive field(E c)inherent to PVTF for switching its polarization,however,is not beneficial for practical memory or sensor device *** strategies,including irradiation and interface control,have been thus developed to reduce E *** many efforts,a facile approach to tailoring intrinsic E_(c) of PVTF has not been *** this work,an optically controlled E_(c) was reported,which is achieved for the first time by introducing photosensitive MAPbI3 nanocrystals into PVTF *** exposed to the irradiation of 532 nm laser light,a decreased E_(c) of the composites can be achieved reversibly by increasing the light *** decreased level of E_(c) increases as the MAPbI3 content enhanced,and a 10.7%reduction of E_(c) can be achieved in 15%(mass fraction)MAPbI3/PVTF *** results could be attributed to loading an internal stress on PVTF,which was generated by the photostriction of MAPbI3 *** explanation was further supported by in-situ XRD results under irradiation of 532 nm laser *** findings may offer the opportunity to optically modulate the ferroelectric properties of PVTF composites for optimized device performances.

关键词： Poly(vinylidene fluoride-trifluoroethylene)[P(VDF-TrFE)] MAPbI_(3) Photostriction Optically controlled coercive field

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基于PKI技术的PDF签名签章文档验证方案研究与设计

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信息安全与通信保密 2024年第2期 80-92页

作者：黄腾辉高超航寇建波李登和任昭辉中电科网络安全科技股份有限公司四川成都610041

随着互联网和数字化转型的快速发展,电子文档签名和签章技术已成为数字化时代的重要环节,广泛应用于合同签署、电子商务和电子档案管理等领域,而接收者如何正确有效验证以确保文档的真实可靠显得尤为重要。基于当前对电子文档验证的实践... 详细信息

随着互联网和数字化转型的快速发展,电子文档签名和签章技术已成为数字化时代的重要环节,广泛应用于合同签署、电子商务和电子档案管理等领域,而接收者如何正确有效验证以确保文档的真实可靠显得尤为重要。基于当前对电子文档验证的实践,从电子签名法可靠电子签名要求出发,对文档结构、验证关键点和验证流程深入分析,阐述如何确保验证结果的准确性和可靠性,保障数字签名和电子签章在文档传输过程中实现真实性、完整性和不可否认性的目标。

关键词：电子文档数字签名电子签章电子签名

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循环流化床锅炉双捅渣灰控阀结构设计

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今日自动化 2024年第2期 56-58页

作者：任朝晖张军惠建峰许杰周新明内蒙古北方蒙西发电有限责任公司内蒙古鄂尔多斯016014

为解决锅炉运行中广泛存在的排渣堵塞问题,文章提出了创新的循环流化床锅炉双捅渣灰控阀的结构设计方案,阐述了这一新型阀门结构的关键部分,即驱动结构和螺旋式阀杆结构,并探讨了如何将这两个核心组件集成于循环流化床锅炉的双捅渣灰控... 详细信息

为解决锅炉运行中广泛存在的排渣堵塞问题,文章提出了创新的循环流化床锅炉双捅渣灰控阀的结构设计方案,阐述了这一新型阀门结构的关键部分,即驱动结构和螺旋式阀杆结构,并探讨了如何将这两个核心组件集成于循环流化床锅炉的双捅渣灰控阀中。研究结果表明,该结构设计不仅可以有效解决排渣堵塞问题,还能显著提高锅炉的运行效率和安全性,为新能源产业的可持续发展作出贡献。

关键词：驱动结构螺旋式阀杆双捅渣灰控阀新能源产业

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Dynamic Characteristics of Multi-degrees of Freedom System Rotor-bearing System with Coupling Faults of Rub-impact and Crack

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Chinese Journal of Mechanical Engineering 2014年第4期27卷 785-792页

作者： ren zhaohui ZHOU Shihua LI Chaofeng WEN Bangchun School of Mechanical Engineering and Automation Northeastern University

Extensive studies on rotor systems with single or coupled multiple faults have been carried out. However these studies are limited to single-span rotor systems. A finite element model for a complex rotor-bearing system with coupled faults is presented. The dynamic responses of the rotor-bearing system are obtained by using the rotor dynamics theory and the modern nonlinear dynamics theory in connection with the continuation-shooting algorithm（commonly used for obtaining a periodic solution for a nonlinear system） for a range of rub-impact clearances and crack depths. The stability and Hopf instability of the periodic motion of the rotor-bearing system with coupled faults are analyzed by using the procedure described. The results indicate that the finite element method is an effective way for determining the dynamic responses of such complex rotor-bearing systems. Further for a rotor system with rub-impact and crack faults, the influences of the clearances are significantly different for different rub-impact stiffness. On the contrary, the influence of crack depths is rather small. The instability speeds of the rotor-bearing system increase due to the presence of the crack fault. The results obtained using the new finite element model, presented for computation and analysis of dynamic responses of the rotor-bearing systems with coupled faults, are in accordance with measurements in experiment. The formulations given can be used for diagnosis of faults, vibration control, and safe and stable operations of real rotor-bearing systems.

关键词： rotor-bearing system rub-impact crack dynamic characteristic instability

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Nonlinear Dynamic Analysis of Coupled Gear-Rotor-Bearing System with the Effect of Internal and External Excitations

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Chinese Journal of Mechanical Engineering 2016年第2期29卷 281-292页

作者： ZHOU Shihua SONG Guiqiu ren zhaohui WEN Bangchun School of Mechanical Engineering and Automation Northeastern University

Extensive studies on nonlinear dynamics of gear systems with internal excitation or external excitation respectively have been carried out. However, the nonlinear characteristics of gear systems under combined internal and external excitations are scarcely investigated. An eight-degree-of-freedom（8-DOF） nonlinear spur gear-rotor-bearing model, which contains backlash, transmission error, eccentricity, gravity and input/output torque, is established, and the coupled lateral-torsional vibration characteristics are studied. Based on the equations of motion, the coupled spur gear-rotor-bearing system（SGRBS） is investigated using the Runge-Kutta numerical method, and the effects of rotational speed, error fluctuation and load fluctuation on the dynamic responses are explored. The results show that a diverse range of nonlinear dynamic characteristics such as periodic motion, quasi-periodic motion, chaotic behaviors and impacts exhibited in the system are strongly attributed to the interaction between internal and external excitations. Significantly, the changing rotational speed could effectively control the vibration of the system. Vibration level increases with the increasing error fluctuation. Whereas the load fluctuation has an influence on the nonlinear dynamic characteristics and the increasing excitation force amplitude makes the vibration amplitude increase, the chaotic motion may be restricted. The proposed model and numerical results can be used for diagnosis of faults and vibration control of practical SGRBS.

关键词： spur gear-rotor-bearing system(SGRBS) backlash eccentricity internal and external excitations coupled lateral-torsional vibration

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Surface energy-driven solution epitaxial growth of anatase TiO2 homostructures for overall water splitting

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Journal of Materials Science & Technology 2020年第11期42卷 139-144页

作者： Shi Li Luoyuan Ruan Shanpeng Wang Zhiyu Wang zhaohui ren Gaorong Han State Key Laboratory of Silicon Materials School of Materials Science and EngineeringCyrus Tang Center for Sensor Materials and ApplicationZhejiang UniversityHangzhou310027China State Key Laboratory of Crystal Materials Shandong UniversityJinan250100China

Titanium dioxide(TiO2)has been extensively investigated as a photocatalyst for water splitting to produce ***,an overall water splitting by using anatase TiO2 is extremely difficult due to the short lifetime of *** this work,we propose that a surface energy decrease from{001}to{101}of anatase TiO2 is able to drive an epitaxial growth.A novel anatase TiO2 homostructure has been successfully synthesized via a facile hydrothermal route,where{101}semi-pyramid nanoparticles epitaxially grew on the both sides of the{001}*** epitaxial relationship between the nanoparticles and the nanosheets has been characterized to be{001}//{001}of anatase *** the first time,it is interesting to find that the homostructure with 12 wt%of{101}semi-pyramid can significantly improve the H2 evolution rate by nearly 5 times compared to the pure nanosheets under the ultraviolet *** importantly,such homostructure enables 10.78μmol g-1h-1 of O2 production whereas the pure nanosheets cannot evolve detectable O2 ***,the time-resolved photoluminescence analysis indicates that the mean lifetime of the holes is increased from 2.20 ns of the nanosheets to 3.59 ns of the homostructure,accounting for the observed overall water *** findings suggest that constructing a homostructure by a surface energy strategy could be promising towards overall water splitting,which may be applicable to other photocatalytic materials.

关键词： {001} {101} Homostructure Anatase TiO2 Overall water splitting

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