检索结果-南通市图书馆

Textured CsPbI_(3)nanorods composite fibers for stable high output piezoelectric energy harvester

在线全文

学校读者我要写书评

暂无评论

eScience 2024年第5期4卷 150-159页

作者： Tao Yang Dengzhou Jia Bing Xu Yongfei Hao Yanglong Hou kang wang Enhui wang Zhentao Du Sheng Cao Kuo-Chih Chou Xinmei Hou Institute for Carbon Neutrality University of Science and Technology BeijingBeijing 100083China Institute of Steel Sustainable Technology Liaoning Academy of MaterialsShenyang 110000China School of Materials Shenzhen Campus of Sun Yat-Sen UniversityShenzhen 518107China MOE Key Laboratory of New Processing Technology for Non-ferrous Metals and Materials Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured MaterialsGuangxi UniversityNanning 530004China Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing 100083China

The utilization of piezoelectric nanogenerator(PENG)based on halide perovskite materials has demonstrated significant promise for energy harvesting ***,the challenge of synthesizing halide perovskite materials with both high output performance and stability using a straightforward process persists as a substantial ***,we present the fabrication of CsPbI_(3)nanorods(NRs)exhibiting highly uniform orientation within polyvinylidene fluoride(PVDF)fibers through a simple texture engineering approach,marking the instance of enhancing PENG performance in this *** resultant composite fibers showcase a short-circuit current density(I_(sc))of 0.78μAcm^(-2)and an open-circuit voltage(V_(oc))of 81V,representing a 2.5 fold increase compared to the previously reported highest value achieved without the electric poling *** outstanding output performance is ascribed to the orientation of CsPbI_(3)NRs facilitated by texture engineering and dipole poling via the self-polarization ***,the PENG exhibits exceptional thermal and water stability,rendering it suitable for deployment in diverse and challenging environmental *** findings underscore the significant potential of textured CsPbI_(3)NRs composite fibers for powering low-power consumer electronics,including commercial LEDs and electronic watches.

关键词： Texture engineering CsPbI_(3) Piezoelectric nanogenerator Self-polarization Electrospinning

个人信息保护民事公益诉讼损害赔偿规则适用研究

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

河北法学 2024年第7期42卷 50-67页

作者：王康郑州大学法学院河南郑州450001

个人信息保护民事公益诉讼实践中,存在损害赔偿计算方式单一、损害赔偿与没收违法所得适用混乱、惩罚性赔偿适用态度不明等问题。传统的“差额说”损害论存在局限性,以违法所得计算损害赔偿的方法不具有普适性。以恢复完整公共利益为目... 详细信息

个人信息保护民事公益诉讼实践中,存在损害赔偿计算方式单一、损害赔偿与没收违法所得适用混乱、惩罚性赔偿适用态度不明等问题。传统的“差额说”损害论存在局限性,以违法所得计算损害赔偿的方法不具有普适性。以恢复完整公共利益为目标,损害赔偿的范围应包括经济利益与秩序利益、现实利益与未来利益,但不包括民事主体的个体损失。适用惩罚性赔偿具有正当性,但应处理好其与刑事、行政责任之关系。在损害赔偿规则适用中,应引入“动态系统论”这一理论工具,将侵害人主观状态、具体情节、影响后果、获利数额、恢复公共秩序的合理开支、侵害人经济和生活状况作为考量因素,合理计算损害赔偿数额;应平衡罚金、罚款和惩罚性赔偿的数额,明确没收违法所得与损害赔偿的折抵关系;此外还应加强损害赔偿金的管理,保证其用于填补、修复个人信息保护相关的公共利益损害。

关键词：个人信息保护民事公益诉讼损害赔偿规则适用动态系统论惩罚性赔偿

二项分布双边收尾概率和假设检验统计量的几处修正

在线全文

学校读者我要写书评

暂无评论

作物学报 2024年第6期50卷 1361-1372页

作者：王建康中国农业科学院作物科学研究所/作物基因资源与育种国家重点实验室北京100081

二项分布是广泛存在的一种离散型概率分布。服从二项分布B(n,p)的一个随机变量等于n个相互独立且服从贝努利分布B(1,p)的随机变量之和,二项分布包含参数p的估计与检验等同于贝努利分布参数p的估计与检验。本文修正常见教科书中有关二项... 详细信息

二项分布是广泛存在的一种离散型概率分布。服从二项分布B(n,p)的一个随机变量等于n个相互独立且服从贝努利分布B(1,p)的随机变量之和,二项分布包含参数p的估计与检验等同于贝努利分布参数p的估计与检验。本文修正常见教科书中有关二项分布双边收尾概率计算和假设检验统计量构建中存在的3处问题。(1)对二项分布B(n,p)的取值概率pk(k=0,1,…,n)从小到大排序,排序后的概率用p_((k))表示,观测值k的双边收尾精确概率等于■;(2)二项分布B(n,p)参数p与给定值p0的差异显著性检验统计量被修正为■,该统计量在大样本条件下近似服从正态分布N(p–p0,1);(3)二项分布B(n1,p1)和B(n2,p2)的参数p1和p2差异显著性检验统计量被修正为■,该统计量在大样本条件下近似服从正态分布N(p1–p2,1)。修正后的双边收尾概率是精确值,不会出现概率大于1的问题。修正后的2个检验统计量无论原假设是否成立,其大样本近似正态分布的方差均为1,有利于准确研究备择假设条件下检验统计量的功效。此外,文中还介绍了小样本条件下二项分布参数的精确检验,对比分析了准确检验与近似检验的异同;讨论了修正统计量的理论基础,给出了小概率和大样本的判定标准,列出了贝努利分布参数检验与正态分布均值检验的异同。期望读者能够从中了解到假设检验与统计推断作为统计学核心研究内容的全貌。

关键词：二项分布正态分布假设检验检验统计量修正检验功效

Traffic Sign Detection Model Based on Improved RT-DETR

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

印刷与数字媒体技术研究 2024年第4期 97-106,178页

作者： wang Yong-kang SI Zhan-jun College of Artificial Intelligence Tianjin University of Science and TechnologyTianjin 300457China

The correct identification of traffic signs plays an important role in automatic driving technology and road safety ***,to address the problems of misdetection and omission in traffic sign detection due to the variety of sign types,significant size differences and complex background information,an improved traffic sign detection model for RT-DETR was proposed in this ***,the HiLo attention mechanism was added to the Attention-based Intra-scale Feature Interaction,which further enhanced the feature extraction capability of the network and improved the detection efficiency on high-resolution ***,the CAFMFusion feature fusion mechanism was designed,which enabled the network to pay attention to the features in different regions in each *** on this,the model could better capture the remote dependencies and neighborhood feature correlation,improving the feature fusion capability of the ***,the MPDIoU was used as the loss function of the improved model to achieve faster convergence and more accurate regression *** experimental results on the TT100k-2021 traffic sign dataset showed that the improved model achieves the performance with a precision value of 90.2%,recall value of 88.1%and mAP@0.5 value of 91.6%,which are 4.6%,5.8%,and 4.4%better than the original RT-DETR model *** model effectively improves the problem of poor traffic sign detection and has greater practical value.

关键词： Object detection Traffic signs RT-DETR CAFMFusion

虚拟现实技术在弱视患儿视觉训练中应用的范围综述

在线全文

学校读者我要写书评

暂无评论

中华护理杂志 2024年第16期59卷 1948-1956页

作者：王康王俏李静中国中医科学院眼科医院护理部北京市100040

目的对虚拟现实技术在弱视患儿视觉训练中应用的相关研究进行范围综述,为规范其应用提供参考。方法依据范围界定审查指南,系统检索Embase、Web of Science、CINAHL、Cochrane Library、Scopus、PubMed、中国生物医学文献数据库、万方数... 详细信息

目的对虚拟现实技术在弱视患儿视觉训练中应用的相关研究进行范围综述,为规范其应用提供参考。方法依据范围界定审查指南,系统检索Embase、Web of Science、CINAHL、Cochrane Library、Scopus、PubMed、中国生物医学文献数据库、万方数据库、维普数据库、中国知网中的相关研究,检索时限为建库至2023年11月1日,对纳入文献进行归纳和分析。结果共纳入24篇文献。其中,二分法训练、视感知训练和视觉推拉模型训练为基于虚拟现实技术进行视觉训练的主要方式,通常以游戏、动画、视频影像的形式进行干预。评估指标包括视觉分辨率、最佳矫正视力、立体视、立体视敏锐度、对比敏感度、视觉诱发电位、三级视功能,以及安全性、训练依从性、接受度和满意度等。结论基于虚拟现实技术的视觉训练在弱视患儿中应用安全可行,可改善患儿视力、提高训练依从性。未来可基于虚拟现实技术开发智能化视觉训练系统,并根据患儿的年龄、弱视类型和程度,构建更科学、有效的结构化视觉训练方案。

关键词：虚拟现实弱视视觉训练范围综述儿科护理学

Fiber Bragg Grating Strain Sensing Sliding Mode Control based on Extended State Observer

在线全文

学校读者我要写书评

暂无评论

Fiber Bragg Grating Strain Sensing Sliding Mode Control base...

The Association Between Preserved Ratio Impaired Spirometry and Mortality –– 10 CKB Study Areas, China, 2004–2022

第35届中国过程控制会议

作者： Tongming Huo Xiaoli Li Lianqing Zhu kang wang Beijing Key Laboratory of Computational Intelligence and Intelligent System Engineering Research Center of Digital Community Ministry of Education Beijing Engineering Research Center of Optoelectronic Information and Instruments Beijing Information Science & Technology University

Sliding mode control strategy based on extended observer is designed to address the issue of the inability to directly obtain strain, structural deformation and unknown disturbances in the health monitoring of structures such as aircraft using Fiber Bragg Grating strain sensing signals. The extended state observer is utilized to estimate both the system state and disturbances using strain signals. A nonlinear function is designed to enhance the convergence speed and tracking accuracy of the extended observer. This enables feedforward compensation for the sliding mode controller and reduces oscillations. By employing sat(·)function instead of the sign(·) function, it further suppresses sliding mode chattering while ensuring tracking of the state and convergence of errors. Simulation experiment demonstrate that the proposed control method effectively enhances the system performance.

关键词： Fiber Bragg Grating Strain Sensing Extended State Observer Sliding Mode Control Saturation Function

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

China CDC weekly 2024年第43期6卷 1120-1125,I0003页

作者： Yalei Ke Xinyi Zhang Dianjianyi Sun Pei Pei Huaidong Du Yiping Chen Ling Yang Xiaoming Yang kang wang Junshi Chen Zhengming Chen Jun Lv Liming Li Canqing Yu Department of Epidemiology and Biostatistics School of Public HealthPeking University Health Science CenterBeijingChina Peking University Center for Public Health and Epidemic Preparedness&Response BeijingChina Key Laboratory of Epidemiology of Major Diseases(Peking University) Ministry of EducationBeijingChina Clinical Trial Service Unit&Epidemiological Studies Unit(CTSU) Nuffield Department of Population HealthUniversity of OxfordOxfordUK Shibei Center for Disease Control and Prevention Qingdao CityShandong ProvinceChina China National Center for Food Safety Risk Assessment BeijingChina State Key Laboratory of Vascular Homeostasis and Remodeling Peking UniversityBeijingChina.

What is already known about this topic?China has the world’s most significant public health and economic burden of chronic respiratory ***,the association between preserved ratio impaired spirometry(PRISm)and mortality risk is *** is added by this report?The PRISm group exhibited a 37%higher risk of allcause mortality than the normal group,and the risks of death from cardiovascular diseases,neoplasms,respiratory diseases,and infectious and parasitic diseases were also increased in ***,the presence of respiratory symptoms or disease was associated with an increased risk of mortality in *** are the implications for public health practice?It is imperative to enhance public awareness of PRISm and to implement measures to facilitate the regression of PRISm toward normal lung function.

关键词： function. impaired neoplasms

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

IRS辅助的车联网相移设计和信道对齐策略

系统工程与电子技术 2024年第2期46卷 761-769页

作者：王汝言王康崔亚平何鹏吴大鹏重庆邮电大学通信与信息工程学院重庆400065 先进网络与智能互联技术重庆市高校重点实验室重庆400065 泛在感知与互联重庆市重点实验室重庆400065

针对车联网中车辆的动态移动以及信号的随机散射所导致的信道快速变化问题,研究了智能反射面(intelligent reflecting surface,IRS)辅助的车联网通信并提出了联合相移设计和信道对齐策略,以削减车联网中多普勒频移的影响并提升通信性能... 详细信息

针对车联网中车辆的动态移动以及信号的随机散射所导致的信道快速变化问题,研究了智能反射面(intelligent reflecting surface,IRS)辅助的车联网通信并提出了联合相移设计和信道对齐策略,以削减车联网中多普勒频移的影响并提升通信性能。提出的策略由两个阶段构成。在第一阶段设计IRS的相移以改善级联信道的衰落状态,在策略的第二阶段进行修正函数的设计,实现了直接信道和级联信道的信道对齐,从而减少直接信道快衰落状态对通信性能的影响。通过联合相移设计和信道对齐策略中设计的反射相移以及修正函数,实现了通信性能的提升。仿真结果表明,所提策略相比于相移优化策略可以提升8.8%的频谱效率。

关键词：车联网智能反射面衰落信道相移设计

在线全文

学校读者我要写书评

暂无评论

基于超表面的多通道窄带滤光片研究

应用光学 2024年第1期45卷 184-191页

作者：王敏孙硕李晟吴佳王康南京信息工程大学电子与信息工程学院江苏南京210044 安徽建筑大学电子与信息工程学院安徽合肥230601

针对传统多通道窄带滤光片存在尺寸大、通道选择性差的问题,该文设计了由分布式布拉格反射镜(DBR)和超表面微纳阵列组成的多通道窄带滤光片。利用传输矩阵法分析单侧DBR介质周期以及缺陷层折射率对透射光谱的影响,并优化了窄带滤光片结... 详细信息

针对传统多通道窄带滤光片存在尺寸大、通道选择性差的问题,该文设计了由分布式布拉格反射镜(DBR)和超表面微纳阵列组成的多通道窄带滤光片。利用传输矩阵法分析单侧DBR介质周期以及缺陷层折射率对透射光谱的影响,并优化了窄带滤光片结构。通过Comsol Multiphysics软件搭建窄带滤光片单元结构进行模拟仿真,研究了超表面以及入射角对窄带滤光片滤波特性的影响。仿真结果表明:通过调节超表面边长能够调控窄带滤光片的中心波长,在634 nm~714 nm的红光波段均可以获得一个带宽窄、透射率高的透射峰;每一个通道的的中心波长都可以通过调节超表面边长来调控,从而实现多个光谱通道的窄带滤光;入射光线小角度范围(0°~10°)内的变化对滤波性能的影响甚微。该结果为多通道窄带滤光片的设计提供了一条新的思路。

关键词：多通道窄带滤光片分布式布拉格反射镜超表面缺陷模入射角

维普期刊数据库博看期刊