检索结果-南通市图书馆

Machine learning-based detection of cervical spondylotic myelopathy using multiple gait parameters

在线全文

学校读者我要写书评

暂无评论

Biomimetic Intelligence & Robotics 2023年第2期3卷 30-40页

作者： Xinyu Ji Wei Zeng Qihang Dai Yuyan Zhang shaoyi du Bing Ji School of Control Science and Engineering Shandong UniversityJinan 250061China School of Physics and Electromechanical Engineering Longyan UniversityLongyan 364012China Institute of Artificial Intelligence and Robotics Xi’an Jiaotong UniversityXi’an 710049China

Cervical spondylotic myelopathy(CSM)is the main cause of adult spinal cord dysfunction,mostly appearing in middle-aged and elderly patients.Currently,the diagnosis of this condition depends mainly on the available imaging tools such as X-ray,computed tomography and magnetic resonance imaging(MRI),of which MRI is the gold standard for clinical diagnosis.However,MRI data cannot clearly demonstrate the dynamic characteristics of CSM,and the overall process is far from costefficient.Therefore,this study proposes a new method using multiple gait parameters and shallow classifiers to dynamically detect the occurrence of CSM.In the present study,45 patients with CSM and 45 age-matched asymptomatic healthy controls(HCs)were recruited,and a three-dimensional(3D)motion capture system was utilized to capture the locomotion data.Furthermore,63 spatiotemporal,kinematic,and nonlinear parameters were extracted,including lower limb joint angles in the sagittal,coronal,and transverse planes.Then,the Shapley Additive exPlanations(SHAP)value was utilized for feature selection and reduction of the dimensionality of features,and five traditional shallow classifiers,including support vector machine(SVM),logistic regression(LR),k-nearest neighbor(KNN),decision tree(DT),and random forest(RF),were used to classify gait patterns between CSM patients and HCs.On the basis of the 10-fold cross-validation method,the highest average accuracy was achieved by SVM(95.56%).Our results demonstrated that the proposed method could effectively detect CSM and thus serve as an automated auxiliary tool for the clinical diagnosis of CSM.

关键词： Cervical spondylotic myelopathy Gait analysis Machine learning Shapley Additive exPlanations

On-chip ultrafast stackable dielectric laser positron accelerator

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

Chinese Physics B 2024年第3期33卷 350-354页

作者：孙斌何阳帆潘晨浩樊思劼王度王少义赵宗清 Department of Plasma Physics and Fusion Engineering School of Nuclear Science and TechnologyUniversity of Science and Technology of ChinaHefei 230026China National Key Laboratory of Plasma Physics Research Center of Laser FusionChina Academy of Engineering PhysicsMianyang 621900China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China State Key Laboratory of High Field Laser Physics and Chinese Academy of Sciences Center for Excellence in Ultra-Intense Laser Science Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China Department of Engineering Physics Tsinghua UniversityBeijing 100084China The Institute of Technological Sciences Wuhan UniversityWuhan 430072China

We present a first on-chip positron accelerator based on dielectric laser acceleration.This innovative approach significantly reduces the physical dimensions of the positron acceleration apparatus,enhancing its feasibility for diverse applications.By utilizing a stacked acceleration structure and far-infrared laser technology,we are able to achieve a seven-stage acceleration structure that surpasses the distance and energy gain of using the previous dielectric laser acceleration methods.Additionally,we are able to compress the positron beam to an ultrafast sub-femtosecond scale during the acceleration process,compared with the traditional methods,the positron beam is compressed to a greater extent.We also demonstrate the robustness of the stacked acceleration structure through the successful acceleration of the positron beam.

关键词： dielectric laser accelerator positron accelerator high gradient accelerator inverse Cherenkov effect

A Correntropy-based Affine Iterative Closest Point Algorithm for Robust Point Set Registration

在线全文

学校读者我要写书评

暂无评论

IEEE/CAA Journal of Automatica Sinica 2019年第4期6卷 981-991页

作者： Hongchen Chen Xie Zhang shaoyi du Zongze Wu Nanning Zheng the School of Electronic and Information Engineering South China University of TechnologyGuangzhou 510640China the School of Electric Power South China University of TechnologyGuangzhou 510640China the Institute of Artificial Intelligence and Robotics Xi’an Jiaotong UniversityXi’an 710049China the School of Automation Guangdong University of TechnologyGuangzhou 510006China IEEE

The iterative closest point(ICP)algorithm has the advantages of high accuracy and fast speed for point set registration,but it performs poorly when the point set has a large number of noisy outliers.To solve this problem,we propose a new affine registration algorithm based on correntropy which works well in the affine registration of point sets with outliers.Firstly,we substitute the traditional measure of least squares with a maximum correntropy criterion to build a new registration model,which can avoid the influence of outliers.To maximize the objective function,we then propose a robust affine ICP algorithm.At each iteration of this new algorithm,we set up the index mapping of two point sets according to the known transformation,and then compute the closed-form solution of the new transformation according to the known index mapping.Similar to the traditional ICP algorithm,our algorithm converges to a local maximum monotonously for any given initial value.Finally,the robustness and high efficiency of affine ICP algorithm based on correntropy are demonstrated by 2D and 3D point set registration experiments.

关键词： Affine iterative closest point(ICP)algorithm correntropy-based robust point set registration

Virtual source approach for maximizing resolution in high-penetration gamma-ray imaging

在线全文

学校读者我要写书评

暂无评论

Matter and Radiation at Extremes 2024年第3期9卷 19-30页

作者： Yuchi Wu shaoyi Wang Bin Zhu Yonghong Yan Minghai Yu Gang Li Xiaohui Zhang Yue Yang Fang Tan Feng Lu Bi Bi Xiaoqin Mao Zhonghai Wang Zongqing Zhao Jingqin Su Weimin Zhou Yuqiu Gu National Key Laboratory of Plasma Physics Laser Fusion Research CenterCAEPMianyangSichuan 621900China College of Physics Sichuan UniversityChengdu 610065China

High-energy gamma-ray radiography has exceptional penetration ability and has become an indispensable nondestructive testing(NDT)tool in various fields.For high-energy photons,point projection radiography is almost the only feasible imaging method,and its spatial resolution is primarily constrained by the size of the gamma-ray source.In conventional industrial applications,gamma-ray sources are commonly based on electron beams driven by accelerators,utilizing the process of bremsstrahlung radiation.The size of the gamma-ray source is dependent on the dimensional characteristics of the electron beam.Extensive research has been conducted on various advanced accelerator technologies that have the potential to greatly improve spatial resolution in NDT.In our investigation of laser-driven gamma-ray sources,a spatial resolution of about 90μm is achieved when the areal density of the penetrated object is 120 g/cm^(2).A virtual source approach is proposed to optimize the size of the gamma-ray source used for imaging,with the aim of maximizing spatial resolution.In this virtual source approach,the gamma ray can be considered as being emitted from a virtual source within the convertor,where the equivalent gamma-ray source size in imaging is much smaller than the actual emission area.On the basis of Monte Carlo simulations,we derive a set of evaluation formulas for virtual source scale and gamma-ray emission angle.Under optimal conditions,the virtual source size can be as small as 15μm,which can significantly improve the spatial resolution of high-penetration imaging to less than 50μm.

关键词： resolution approach utilizing

Research Progress of High Entropy Ceramic Materials

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

Research and Application of Materials Science 2024年第1期6卷 16-22页

作者： Song WU Shikai LIU Jialin WANG Bibo HAN shaoyi SHEN Zhigang YU Zhaobo ZHANG Xinhua ZHENG School of Materials Science and Engineering Henan University of TechnologyZhengzhouHenan450001China

High-entropy materials(HEMs)have better mechanical,thermal,and electrical properties than traditional materials due to their special"high entropy effect".They can also adjust the performance of high entropy ceramics by adjusting the proportion of raw materials,and have broad application prospects in many fields.This article provides a review of the high entropy effect,preparation methods,and main applications of high entropy ceramic materials,especially exploring relevant research on high entropy perovskite ceramics.It is expected to provide reference for the promotion of scientific research and the development of further large-scale applications of high-entropy ceramic materials.

关键词： High-entropy ceramic materials high entropy effect preparation method perovskite structure research prog

“智慧+食品监管”:发展历程、应用现状与未来方向

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

食品科学技术学报 2024年第3期42卷 1-10页

作者：左敏王菲宋绍义颜文婧戴欣然北京工商大学农产品质量安全追溯技术及应用国家工程研究中心北京100048 北京物资学院北京101149 北京工商大学食品与健康学院北京100048 北京工商大学计算机与人工智能学院北京100048

大食物观为食品产业的未来发展提出了新的需求。随着食品产业的扩大和升级,影响食品安全的因素将变得越来越复杂,因而带来更为艰巨的食品安全风险防控任务。只有保障业态安全,食品产业才能健康和顺利发展。当前,有限的监管资源和力量与... 详细信息

大食物观为食品产业的未来发展提出了新的需求。随着食品产业的扩大和升级,影响食品安全的因素将变得越来越复杂,因而带来更为艰巨的食品安全风险防控任务。只有保障业态安全,食品产业才能健康和顺利发展。当前,有限的监管资源和力量与食品产业中繁重复杂的监管任务之间的矛盾日益凸显,传统的监管手段和方式难以满足食品产业的高质量发展需求。数据驱动下的计算机科学和智能技术为食品监管提供了技术切入点。在食品产业链中,实时采集各种信息形成“数据智能”,发展食品行业的智慧监管技术,有助于建设规范有序、协同高效的食品产业生态环境,为食品行业高质量发展提供保障。介绍了食品产业中智慧监管从初始到繁荣的发展历程,分析了智能技术在食品全产业链和食品监管体系数字化建设中的应用,指出了以安全为底线,以品质监测、营养分析、风味评估为新导向的食品智慧监管未来发展方向,探讨了食品行业智慧监管面临的机遇和挑战,希望为食品监管的智能化和高质量发展提供技术参考。

关键词：人工智能食品监管安全保障风险防范大食物观

Thermoelectric Properties of an Individual Suspended Single-Crystalline Sb_(2)Se_(3)Nanowire

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2022年第4期31卷 1106-1114页

作者： du Yanzheng SHI shaoyi MIAO Tingting MA Weigang MAI Liqiang ZHANG Xing Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Department of Engineering Mechanics Tsinghua UniversityBeijing 100084China Beijing Key Laboratory of Process Fluid Filtration and Separation College of Mechanical and Transportation EngineeringChina University of PetroleumBeijing 102249China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China

Nanowires exhibit excellent thermoelectric performance,due to the stronger quantum confinement and phonon scattering effect compared to bulk materials.However,it is a challenge to accurately evaluate the thermoelectric performance of nanowires.In this paper,the thermoelectric properties of an individual suspended Sb_(2)Se_(3) nanowire have been characterized by comprehensive T-type method,including thermal conductivity,electrical conductivity,Seebeck coefficient and figure of merit.The thermal conductivity increases from 0.57 W/(m·K)to 3.69 W/(m·K)with temperature increasing from 80 K to 320 K.The lattice vibration dominates the heat conduction process,and due to its flawless crystal structure,the thermal conductivity is not lower than the reported values of bulk Sb_(2)Se_(3).The electrical conductivity increases from 7.83 S/m to 688 S/m in the temperature range of 50 K–320 K,which is a great improvement compared with the corresponding bulk value.At 294 K,the Seebeck coefficient of the Sb_(2)Se_(3) nanowire is–1120μV/K and the corresponding figure of merit is 0.064.

关键词： Sb_(2)Se_(3)nanowire thermoelectric properties thermal conductivity Seebeck coefficient electrical conductivity

在线全文

学校读者我要写书评

暂无评论

白云鄂博西矿含铁岩选矿工艺试验研究

中国矿业 2024年第1期33卷 226-234页

作者：唐绍义李彦鑫内蒙古包钢钢联股份有限公司巴润矿业分公司内蒙古包头041010

为实现白云鄂博西矿TFe品位13%~16%铁素资源(含铁岩)的回收利用,本文以含铁岩为研究对象,通过采用化学分析、X射线衍射仪、光学显微镜等检测手段研究其矿石性质,并在此基础上进行系统的选矿试验。研究结果表明:该含铁岩中TFe品位13.14%... 详细信息

为实现白云鄂博西矿TFe品位13%~16%铁素资源(含铁岩)的回收利用,本文以含铁岩为研究对象,通过采用化学分析、X射线衍射仪、光学显微镜等检测手段研究其矿石性质,并在此基础上进行系统的选矿试验。研究结果表明:该含铁岩中TFe品位13.14%,可回收的主要金属矿物为磁铁矿,占全铁比例为52.28%。含铁岩需破碎至−3 mm时才能获得TFe品位20%以上的预选粗精矿,且通过阶段破碎-分级预选流程试验可获得尾矿抛除产率56.01%、粗精矿TFe品位20.62%、磁性铁品位14.80%、TFe回收率69.19%、磁性铁回收率94.27%的技术指标,推荐采用三段破碎-两级预选-高压辊磨超细碎抛尾的原则流程作为预选技术改造方案。将预选粗精矿细磨至−0.045 mm含量85.80%时,经过两次弱磁选后最终获得TFe品位65.10%、TFe回收率50.25%、磁性铁回收率93.03%的合格铁精矿。该研究结果可为含铁岩的高效回收利用提供科学依据。

关键词：白云鄂博西矿含铁岩超贫铁矿石干式预选资源化利用高压辊磨机

在线全文

学校读者我要写书评

暂无评论

辽宁省大石桥市果树分布及生产普查和研究

果树资源学报 2024年第2期5卷 115-121页

作者：杜洁张素敏陈伟隋韶奕辽宁省果树科学研究所辽宁营口115214 大石桥市农业农村事务中心辽宁大石桥115100

于2020—2022年对大石桥市的果树产业开展调研工作,全面普查了大石桥市下属8个乡镇、共75个村的果树种植情况,包括14个树种的种植数量、栽培面积以及3年间的产量。通过调查与分析,深入了解了大石桥市果树产业的现状和问题,并提出合理的... 详细信息

于2020—2022年对大石桥市的果树产业开展调研工作,全面普查了大石桥市下属8个乡镇、共75个村的果树种植情况,包括14个树种的种植数量、栽培面积以及3年间的产量。通过调查与分析,深入了解了大石桥市果树产业的现状和问题,并提出合理的解决方案。普查和研究可为预测大石桥市未来果树产业的变化趋势提供科学依据,为促进果树产业与市场的对接、提高产品的附加值和市场竞争力、促进产业稳定和可持续的发展、带动地方农业经济的繁荣提供有力的支持。

关键词：果树种质资源普查分析