检索结果-南通市图书馆

Assessing target optical camouflage effects using brain functional networks:A feasibility study

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2024年第4期34卷 69-77页

作者： Zhou Yu Li Xue Weidong Xu Jun liu Qi Jia Jianghua Hu jidong Wu National Key Laboratory of Lightning Protection and Electromagnetic Camouflage Army Engineering University Nanjing 210007JiangsuChina Unit 31608 of PLA Xiamen 361000FujianChina School of Biological Sciences&Medical Engineering Southeast UniversityNanjing 210096JiangsuChina

Brain functional networks model the brain's ability to exchange information across different regions,aiding in the understanding of the cognitive process of human visual attention during target searching,thereby contributing to the advancement of camouflage evaluation.In this study,images with various camouflage effects were presented to observers to generate electroencephalography(EEG)signals,which were then used to construct a brain functional network.The topological parameters of the network were subsequently extracted and input into a machine learning model for training.The results indicate that most of the classifiers achieved accuracy rates exceeding 70%.Specifically,the Logistic algorithm achieved an accuracy of 81.67%.Therefore,it is possible to predict target camouflage effectiveness with high accuracy without the need to calculate discovery probability.The proposed method fully considers the aspects of human visual and cognitive processes,overcomes the subjectivity of human interpretation,and achieves stable and reliable accuracy.

关键词： Camouflage effect evaluation Electroencephalography(EEG) Brain functional networks Machine learning

Patterns of crop-specific fertilizer-nitrogen losses and opportunities for sustainable mitigation:A quantitative overview of 15N-tracing studies

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

Soil Ecology Letters 2024年第2期6卷 71-81页

作者： Cong Xu Hanshen Zhu Haokuang liu Cheng Ji Jie Yuan Guanlin Li jidong Wang Yongchun Zhang National Agricultural Experimental Station for Agricultural Environment LuheInstitute of Agricultural Resources and EnvironmentJiangsu Academy of Agricultural SciencesNanjing210014China School of the Environment and Safety Engineering Jiangsu UniversityZhenjiang212013China

Pattern and mitigation potential of crop-specific fertilizer-N losses were assessed.China showed high fertilizer-N losses due to high N application rates and low SOC.MAP,SOC,and soil pH are key parameters affecting fertilizer-N losses.At a given application rate,soils with higher SOC have lower fertilizer-N losses.Optimal N rate combined with SOC improvement could cut 34.8%-59.6%of N losses.

关键词： fertilizer-nitrogen loss crop-specific 15N tracing soil organic carbon meta-analysis

Adaptive Decentralized Asymptotic Tracking Control for Large-Scale Nonlinear Systems With Unknown Strong Interconnections

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

IEEE/CAA Journal of Automatica Sinica 2022年第1期9卷 173-186页

作者： Ben Niu jidong liu Ding Wang Xudong Zhao Huanqing Wang College of Information Science and Engineering Shandong Normal UniversityJinan 250014China School of Artificial Intelligence Nankai UniversityTianjin 300071China Faculty of Information Technology Beijing University of TechnologyBeijing 100124 State Key Laboratory of Management and Control for Complex Systems Institute of AutomationChinese Academy of SciencesBeijing 100190China School of Control Science and Engineering Dalian University of TechnologyDalian 116023China Department of Mathematical Science and Automatization Institute Bohai UniversityJinzhou 121000China

An adaptive decentralized asymptotic tracking control scheme is developed in this paper for a class of large-scale nonlinear systems with unknown strong interconnections,unknown time-varying parameters,and disturbances.First,by employing the intrinsic properties of Gaussian functions for the interconnection terms for the first time,all extra signals in the framework of decentralized control are filtered out,thereby removing all additional assumptions imposed on the interconnec-tions,such as upper bounding functions and matching conditions.Second,by introducing two integral bounded functions,asymptotic tracking control is realized.Moreover,the nonlinear filters with the compensation terms are introduced to circumvent the issue of“explosion of complexity”.It is shown that all the closed-loop signals are bounded and the tracking errors converge to zero asymptotically.In the end,a simulation example is carried out to demonstrate the effectiveness of the proposed approach.

关键词： Adaptive decentralized control asymptotic tracking control large-scale nonlinear systems unknown strong interconnections

Bandgap engineering of high mobility two-dimensional semiconductors toward optoelectronic devices

在线全文

学校读者我要写书评

暂无评论

Journal of Materiomics 2023年第3期9卷 527-540页

作者： Qiaoyan Hao Peng Li jidong liu Jiarui Huang Wenjing Zhang International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education Institute of Microscale OptoelectronicsShenzhen UniversityShenzhen518060China Shenzhen Institute of Advanced Electronic Materials Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen518103China

Over the last few years,great advances have been achieved in exploration of high-mobility two-dimensional(2D)semiconductors such as metal chalcogenide InSe and noble-transition-metal dichal-cogenide PdSe_(2).These materials are competitive candidates for constructing next-generation optoelec-tronic devices owing to their unique crystalline and electronic structures.Moreover,the optical and electronic properties of 2D materials can be efficiently modified via precisely engineering their band structures,which is critical for widening specific applications ranging from high-performance opto-electronics to catalysis and energy harvesting.In this review,we focus on the progress in bandgaps engineering of newly emerging high-mobility 2D semiconductors and their applications in optoelec-tronic devices,incorporating our recent study in the InSe and PdSe_(2)systems.First of all,we discuss the structure-property relationship of typical high-mobility 2D semiconductors(InSe and PdSe 2).Next,we analyze several viable strategies for bandgap engineering,including thickness,strain or pressure,alloying,heterostructure,surface modification,intercalation,and so on.Furthermore,we summarize the optoelectronic devices fabricated with such high-mobility 2D semiconductors.The conclusion and outlook in this topic are finally presented.This review aims to provide valuable insights in bandgap engineering of newly emerging 2D semiconductors and explore their potential in future optoelectronic applications.

关键词： High mobility 2D semiconductors Bandgap engineering Alloying Heterostructure

自动乳腺全容积扫描影像组学联合临床和超声特征列线图鉴别良、恶性乳腺导管内病变

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中国医学影像技术 2024年第3期40卷 366-371页

作者：刘梦涵周汇明肖际东中南大学湘雅三医院超声科湖南长沙410013 湖南省妇幼保健院超声科湖南长沙410029

目的观察自动乳腺全容积扫描(ABVS)影像组学联合临床及超声特征列线图鉴别良、恶性乳腺导管内病变的价值。方法回顾性分析144例经病理证实乳腺导管内病变女性患者的临床及超声资料;按照2∶1比例将其随机分为训练集(n=96)及验证集(n=48... 详细信息

目的观察自动乳腺全容积扫描(ABVS)影像组学联合临床及超声特征列线图鉴别良、恶性乳腺导管内病变的价值。方法回顾性分析144例经病理证实乳腺导管内病变女性患者的临床及超声资料;按照2∶1比例将其随机分为训练集(n=96)及验证集(n=48)。基于ABVS图像提取并筛选最优影像组学特征,构建影像组学模型,计算影像组学评分(Radscore);将临床、超声特征及Radscore纳入单因素和多因素logistic回归分析,筛选鉴别良、恶性乳腺导管内病变的独立影响因素,构建临床-超声模型,并联合影像组学模型构建列线图模型;以受试者工作特征(ROC)曲线评估各模型鉴别良、恶性乳腺导管内病变的效能。结果患者年龄[OR(95%CI)=1.104(1.045,1.180),P=0.001]、病变边缘[OR(95%CI)=0.273(0.075,0.917),P=0.039]、微小钙化灶[OR(95%CI)=9.759(2.240,60.730),P=0.006]及Radscore[OR(95%CI)=3.818(1.435,11.994),P=0.012]均为良、恶性乳腺导管内病变的独立影响因素。影像组学模型、临床-超声模型及列线图模型鉴别良、恶性乳腺导管内病变的曲线下面积(AUC)在训练集分别为0.766、0.866及0.901,在验证集分别为0.770、0.765及0.854。结论 ABVS影像组学联合临床及超声特征列线图鉴别良、恶性乳腺导管内病变效能良好。

关键词：乳腺肿瘤超声检查乳腺影像报告和数据系统影像组学

在线全文

学校读者我要写书评

暂无评论

自限幅电路建模及在无线电能传输中的应用

电力自动化设备 2024年第6期44卷 110-117页

作者：刘硕苏建徽张健赖纪东杜燕合肥工业大学电气与自动化工程学院安徽合肥230009

在一些无线电能传输(WPT)技术的应用场合,对供电的可靠性与能量接收端的体积有严苛要求。回顾了用于LLC谐振变换器的自限幅电路,提出了基于基波法、通用于这些自限幅电路的非线性电容-非线性电阻等效电路模型。利用自限幅电路构建了本... 详细信息

在一些无线电能传输(WPT)技术的应用场合,对供电的可靠性与能量接收端的体积有严苛要求。回顾了用于LLC谐振变换器的自限幅电路,提出了基于基波法、通用于这些自限幅电路的非线性电容-非线性电阻等效电路模型。利用自限幅电路构建了本质安全且有利于减小接收端体积的WPT变换器拓扑。基于所提模型的计算结果表明,该拓扑具有本质安全性,并估算了自限幅电路工作后其电压增益变化规律。仿真与实验也验证了该拓扑是本质安全的,且提高了WPT装置的偏移容忍度,所提模型可用于估算其电压增益等指标。

关键词：无线电能传输自限幅 LLC谐振变换器基波法非线性

在线全文

学校读者我要写书评

暂无评论

接触网承力索集中荷载测量方法

西南交通大学学报 2024年第3期59卷 510-518页

作者：刘继冬梁茹楠陈交程军营吴积钦西南交通大学电气工程学院四川成都611756

为分析接触网承力索静止与振动状态下的线索形状与集中荷载对应关系.采用抛物线法对静止状态的承力索进行找形计算,通过构建振动微分方程和使用傅里叶变换计算振动状态下的承力索形状;结合受力分析,并根据牛顿第二定律推导静止与振动状... 详细信息

为分析接触网承力索静止与振动状态下的线索形状与集中荷载对应关系.采用抛物线法对静止状态的承力索进行找形计算,通过构建振动微分方程和使用傅里叶变换计算振动状态下的承力索形状;结合受力分析,并根据牛顿第二定律推导静止与振动状态下承力索集中荷载的公式,在获取静态与振动状态下集中荷载处位移变化后,可以通过该公式求解集中荷载;在实验室搭建的振动试验台上对测量方法进行了检验.检验结果表明:静态时的绝对误差为0.20%,主振频率为1 Hz及2 Hz振动状态下的绝对误差百分比均在0.50%以内;采用机器视觉获取集中荷载处静态位置与振动位移数据,进而实现承力索集中荷载非接触测量的方法是可行的.

关键词：接触网承力索振动荷载非接触测量

Genetic Mapping of Laminaria japonica and L. Iongissima Using Amplified Fragment Length Polymorphism Markers in a ＂Two-Way Pseudo- Testcross＂ Strategy

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2007年第3期49卷 392-400页

作者： Yuhui Li Yingxia Yang jidong liu Xiuliang Wang Tianxiang Gao Delin Duan Ocean University of China Qingdao 266003 China Institute of Oceanology the Chinese Academy of Sciences Qingdao 266071 China Ludong University Yantai 264025 China

With a ＂two-way pseudo-testcross＂ mapping strategy, we applied the amplified fragment length polymorphism （AFLP） markers to construct two moderate density genetic linkage maps for Laminaria. The linkage maps were generated from the 60 progenies of the F1 cross family （Laminaria iongissima Aresch. × L. Japonica Miyabe） with twenty pairs of primer combinations. Of the 333 polymorphic loci scored in 60 progenies, 173 segregated in a 1：1 ratio, corresponding to DNA polymorphisms heterozygous in a single parent, and the other 58 loci existing in both parents followed a 3：1 Mendelian segregation ratio. Among the loci with 1：1 segregating ratios, 79 loci were ordered in 14 linkage groups （648.6 cM） of the paternal map, and 72 loci were ordered in 14 linkage groups （601.9 cM） of the maternal map. The average density of loci was approximately 1 per 8 cM. To Investigate the homologies between two parental maps, we used 58 loci segregated 3：1 for further analysis, and deduced one homologous linkage group. The linkage data developed in these maps will be useful for detecting loci-controlling commercially important traits for Laminaria.

关键词： amplified fragment length polymorphism makers genetic linkage map Laminaria japonica Laminaria longissima segregation ratio two-way pseudo-testcross strategy

一种利用微型盒子波进行检波器性能参数标定的方法

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

地球物理学进展 2024年第2期39卷 828-838页

作者：曹国滨刘涛白雪张旭魏继东中石化石油工程地球物理有限公司北京100020 中石化石油工程地球物理有限公司胜利分公司东营257100

微型盒子波(Micro Box Wave Test,MBW)可以被用于检波器灵敏度、允差、最低有效频率以及自然频率、阻尼(限于动圈式检波器)的野外现场标定.根据奈奎斯特频率内不同频段的地震检波系统的主导因素,对地震勘探有意义的频率范围可以划分为... 详细信息

微型盒子波(Micro Box Wave Test,MBW)可以被用于检波器灵敏度、允差、最低有效频率以及自然频率、阻尼(限于动圈式检波器)的野外现场标定.根据奈奎斯特频率内不同频段的地震检波系统的主导因素,对地震勘探有意义的频率范围可以划分为六个不同的频带.频带20~40 Hz是确定10 Hz动圈式检波器的灵敏度和允差的适用频段.同时,微型盒子波初至时间的最大值相对平均值的偏差可以计算某种类型检波器的总体允差(Tolerance in General).总体允差过大时,由检波器自身因素导致的不一致性会淹没微弱的深层反射信号.另外,在具体工区、具体采集参数的情况下,基于“微型盒子波”方法也可以计算不同类型检波器的“最低有效频率”,该指标可以说明检波器的低频拾取能力.最后,如果把无低频衰减的检波器作为标准检波器,可以标定动圈式检波器的自然频率与阻尼两个参数.数据表明,根据动圈式检波器自然频率与阻尼对其拾取的原始数据做检波器反褶积后,其低频分量与无低频衰减的MEMS检波器具有高度一致性.目前的地震采集项目广泛应用动圈式10 Hz检波器施工,该型检波器损失的低频部分经检波器反褶积恢复后,在处理、解释阶段的应用值得进一步深入研究.

关键词：微型盒子波检波器性能参数标定检波器反褶积