检索结果-南通市图书馆

Compressive Sensing Sparse Sampling Method for Composite Material Based on Principal Component Analysis

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

Transactions of Nanjing University of Aeronautics and Astronautics 2018年第2期35卷 282-289页

作者： sun yajie Gu Feihong Ji Sai Wang Lihua Jiangsu Engineering Centre of Network Monitoring Nanjing University of Information Science and Technology Nanjing 210044 P. R. China Jiangsu Collaborative Innovation Center on Atmospheric Environment and Equipment Technology Nanjing University of Information Science and Technology Nanjing 210044 P. R. China School of Computer and Software Nanjing University of Information Science and Technology Nanjing 210044 P. R. China School of Information and Control Nanjing University of Information Science and Technology Nanjing 210014 P. R. China

Signals can be sampled by compressive sensing theory with a much less rate than those by traditional Nyquist sampling theorem,and reconstructed with high probability,only when signals are sparse in the time domain or a transform *** signals are not sparse in real world,but can be expressed in sparse form by some kind of sparse *** used sparse transformations will lose some information,because their transform bases are generally *** this paper,we use principal component analysis for data reduction,and select new variable with low dimension and linearly correlated to the original variable,instead of the original variable with high dimension,thus the useful data of the original signals can be included in the sparse signals after dimensionality reduction with maximize ***,the loss of data can be reduced as much as possible,and the efficiency of signal reconstruction can be ***,the composite material plate is used for the experimental *** experimental result shows that the sparse representation of signals based on principal component analysis can reduce signal distortion and improve signal reconstruction efficiency.

关键词： principal component analysis compressive sensing sparse representation signal reconstruction

Research on the Signal Reconstruction of the Phased Array Structural Health Monitoring Based Using the Basis Pursuit Algorithm

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2019年第2期58卷 409-420页

作者： yajie sun Yanqing Yuan Qi Wang Lihua Wang Enlu Li Li Qiao Jiangsu Engineering Centre of Network Monitoring Nanjing University of Information Science and TechnologyNanjing210044China School of Computer and Software Nanjing University of Information Science and TechnologyNanjing210044China School of Information and Control Nanjing University of Information Science and TechnologyNanjing210044China Capability Systems Centre School of Engineering and Information TechnologyUniversity of New South WalesCanberra2600Australia

The signal processing problem has become increasingly complex and demand high acquisition system,this paper proposes a new method to reconstruct the structure phased array structural health monitoring *** method is derived from the compressive sensing theory and the signal is reconstructed by using the basis pursuit algorithm to process the ultrasonic phased array *** to the principles of the compressive sensing and signal processing method,non-sparse ultrasonic signals are converted to sparse signals by using sparse *** sparse coefficients are obtained by sparse decomposition of the original signal,and then the observation matrix is constructed according to the corresponding sparse ***,the original signal is reconstructed by using basis pursuit algorithm,and error analysis is carried *** research analysis shows that the signal reconstruction method can reduce the signal complexity and required the space efficiently.

关键词： Basis pursuit algorithm compressive sensing phased array signal reconstruction

Impact Force Magnitude and Location Recognition of Composite 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

Computers, Materials & Continua 2020年第9期64卷 1647-1656页

作者： yajie sun Yanqing Yuan Qi Wang Sai Ji Lihua Wang Shao’en Wu Jiangsu Engineering Centre of Network Monitoring Nanjing University of Information Science and TechnologyNanjing210044China School of Computer and Software Nanjing University of Information Science and TechnologyNanjing210044China School of Information and Control Nanjing University of Information Science and TechnologyNanjing210044China Department of Computer Science Ball State UniversityMuncieUSA

In order to identify the location and magnitude of the impact force accurately,determine the damage range of the structure and accelerate the health monitoring of key components of the composite,this paper studies the location and magnitude of the impact force of composite plates by an inverse ***,a PZT sensor mounted on the material plate is used to collect the response signal generated by the impact force,which is from several impact locations,and establish transfer functions between the impact location and the PZT ***,this paper applies several forces to any location on the material plate,and collects the corresponding response signals,and reconstructs the impact force of several locations in ***,according to the reconstruction result of each location,the correct impact location is ***,an improved regularization method is used to optimize the reconstructed impact force and accurate the magnitude of the impact *** comparison experiments prove that the recognition error of this method is smaller.

关键词： Impact force identification transfer function regularization

Role of nanoparticle-mediated immunogenic cell death in cancer immunotherapy

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

Asian Journal of Pharmaceutical Sciences 2021年第2期16卷 129-132页

作者： yajie sun Xiangru Feng Chao Wan Jonathan F.Lovell Honglin Jin Jianxun Ding Union Hospital Tongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430022China China Key Laboratory of Polymer Ecomaterials Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China Department of Biomedical Engineering University at BuffaloState University of New York.BuffaloNew York 14260USA

An essential concept of cancer immunotherapy is that immunogenic cell death(ICD),characterized by the release of tumor-associated antigens(TAAs)and tumor-specific antigens(TSAs)like neoantigens,danger-associated molecular patterns(DAMPs),and pro-inflammatory cytokines,facilitates the presentation of TAAs and TSAs to adaptive immune cells,eliciting an emerging or reinstating a pre-existing anti-cancer immune response.

关键词： immunotherapy cancer death

Design and Experiment of PZT Network-based Structural Health Monitoring Scanning System

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2009年第5期22卷 505-512页

作者： Qiu Lei Yuan Shenfang Wang Qiang sun yajie Yang Weiwei The Aeronautic Key Lab for Smart Material and Structure Nanjing University of Aeronautics and Astronautics Nanjing 210016 China

The active Lamb wave and piezoelectric transducer （PZT）-based structural health monitoring （SHM） technology is a kind of efficient approach to estimate the health state of aircraft structure. In practical applications, PZT networks are needed to monitor large scale structures. Scanning many of the different PZT actuator-sensor channels within these PZT networks to achieve on-line SHM task is important. Based on a peripheral component interconnect extensions for instrumentation （PXI） platform, an active Lamb wave and PZT network-based integrated multi-channel scanning system （PXI-ISS） is developed for the purpose of practical applications of SHM, which is compact and portable, and can scan large numbers of actuator-sensor channels and perform damage assessing automatically. A PXI-based 4 channels gain-programmable charge amplifier, an external scanning module with 276 actuator-sensor channels and integrated SHM software are proposed and discussed in detail. The experimental research on a carbon fiber composite wing box of an unmanned aerial vehicle （UAV） for verifying the functions of the PXI-ISS is mainly discussed, including the design of PZTs layer, the method of excitation frequency selection, functional test of damage imaging, stability test of the PXI-ISS, and the loading effect on signals. The experimental results have verified the stability and damage functions of this system.

关键词： structural health monitoring active Lamb wave piezoelectric transducer network multi-channel scanning system damage detection

在线全文

学校读者我要写书评

暂无评论

亚里士多德与苏格拉底的反诘法

哲学研究 2020年第8期 98-107页

作者：孙亚杰山东大学哲学与社会发展学院

亚里士多德辩证法的思想来源比较多样化,但备受争议的苏格拉底反诘性哲学活动仍是其重要源泉。不过,鉴于反诘法的辩证程序同其哲学目标之间的张力,亚里士多德辩证法既包含着对这种程序的某些描述和揭示,也自觉地、有目的地进行了富有成... 详细信息

亚里士多德辩证法的思想来源比较多样化,但备受争议的苏格拉底反诘性哲学活动仍是其重要源泉。不过,鉴于反诘法的辩证程序同其哲学目标之间的张力,亚里士多德辩证法既包含着对这种程序的某些描述和揭示,也自觉地、有目的地进行了富有成效的重大补充、修正和发展。这种修正和发展不仅是哲学方法论反思的结果,同时也深深渗透着亚里士多德总体上对哲学活动一般结构——包括哲学活动的起点、领域和对象等方面——的独特理解。

关键词：亚里士多德反诘法辩驳法辩证法定义性知识

在线全文

学校读者我要写书评

暂无评论

磁控电弧焊接过程及新技术研究进展

材料导报 2020年第21期34卷 21155-21165页

作者：孙雅杰常云龙沈阳工业大学材料科学与工程学院沈阳110870

电弧等离子体具有导电性,在不同类型的外加磁场作用下,电弧的形态、空间位置、电弧运动的特点发生改变,进而改变电弧行为,影响熔滴过渡过程,减少飞溅,对熔池流动也有重要影响。通过电磁搅拌作用可以提高焊缝成形及焊缝质量。在焊接过程... 详细信息

电弧等离子体具有导电性,在不同类型的外加磁场作用下,电弧的形态、空间位置、电弧运动的特点发生改变,进而改变电弧行为,影响熔滴过渡过程,减少飞溅,对熔池流动也有重要影响。通过电磁搅拌作用可以提高焊缝成形及焊缝质量。在焊接过程中如何控制构件的形状和性能成为焊接过程中迫切需要解决的两大重要问题。研究发现,由于磁场的电磁搅拌作用,焊接接头的组织得到改善,晶粒变得细小均匀,焊接接头缺陷明显减少,焊缝表面由凹凸不平变得光滑,力学性能有所提高。磁场在焊接领域的应用过程中,产生了新技术及新设备,如磁控电弧增材制造技术、磁旋弧焊接技术等。本文主要阐述了低频及高频磁场对电弧焊接过程的影响,尤其对不同类型的磁场、不同参数及不同焊接方法作用下的电弧形态、熔滴过渡及熔池流动过程的影响进行探讨分析,重点介绍了磁控电弧增材制造技术、磁旋弧焊接技术等,并对磁控焊接技术的美好未来进行了展望,磁控焊接技术正逐步向高效化、自动化、智能化等发展。

关键词：外加磁场(EMF) 电弧焊接组织性能增材制造(AM) 磁旋弧

早期亚里士多德辩证法对柏拉图辩证法的革新与发展

在线全文

学校读者我要写书评

暂无评论

哲学动态 2020年第5期 71-79页

作者：孙亚杰山东大学哲学与社会发展学院

作为一切严肃哲学活动的基本展开方式,柏拉图的辩证法不是一种单纯的哲学方法论,而是方法论、存在论和认识论的统一,是理念论形而上学框架中的辩证法。而早期亚里士多德在避免承诺理念论形而上学的前提下,仍然坚守哲学活动或哲学性科学... 详细信息

作为一切严肃哲学活动的基本展开方式,柏拉图的辩证法不是一种单纯的哲学方法论,而是方法论、存在论和认识论的统一,是理念论形而上学框架中的辩证法。而早期亚里士多德在避免承诺理念论形而上学的前提下,仍然坚守哲学活动或哲学性科学探究中辩证法在方法论上的主导地位。不过,这种意义上的辩证法,在活动领域、起点、程序和目的等方面,都对前者进行了重要革新和发展。并且,这些革新与发展,深深渗透着亚里士多德对哲学性科学和辩证法的关系,乃至对整个人类知识图景的重新思索。

关键词：辩证法理念论知识

在线全文

学校读者我要写书评

暂无评论

社会信用体系改革与企业劳动收入份额

证券市场导报 2024年第2期 3-12页

作者：文雯孙亚婕北京外国语大学国际商学院北京100089

提高劳动收入份额是实现共同富裕目标的关键路径。本文基于社会信用体系改革分批试点的准自然实验场景,以2007—2021年沪深A股上市公司数据为样本,从非正式制度的视角探究企业劳动收入份额的影响因素。研究发现:(1)社会信用体系改革显... 详细信息

提高劳动收入份额是实现共同富裕目标的关键路径。本文基于社会信用体系改革分批试点的准自然实验场景,以2007—2021年沪深A股上市公司数据为样本,从非正式制度的视角探究企业劳动收入份额的影响因素。研究发现:(1)社会信用体系改革显著提升了劳动收入份额;(2)社会信用体系改革通过缓解企业代理问题、提高企业信贷融资可得性以及盈利溢出效应等路径提升劳动收入份额;(3)社会信用体系改革提高了普通员工的劳动收入份额,降低了高管的劳动收入份额;(4)社会信用体系改革对劳动收入份额的提升作用在劳动密集型行业以及经济发展相对落后城市的企业更加突出。本文从劳动收入份额视角为社会信用体系改革的政策效果提供了经验证据,对于推动社会信用体系建设的完善和实现共同富裕目标具有现实意义。

关键词：社会信用体系劳动收入份额非正式制度共同富裕

维普期刊数据库博看期刊