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Parameter Identification Based on Force-Displacement Curves for a Bolted Joint Finite Element Model

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Journal of Beijing Institute of Technology 2017年第1期26卷 50-57页

作者： delin Sun Ridong Liao Dexing Qian Zhengkun Cheng School of Mechanical Engineering Beijing Institute of TechnologyBeijing 100081China

In order to identify the uncertain parameters of a bolted joint finite element model,a simple and applicable way of parameter identification is *** utilizing numerical simulation with the Abaqus software and experimental investigation with the MTS material testing system,the tangential force-displacement curves that reflect the characteristics of the bolted joint were *** the basis of this,by employing the response surface methodology（RSM）and genetic algorithms（GAs）,parameters in the FEM model were *** force-displacement curves by both virtual and experimental approaches are well correlated at the *** phenomenon-based parameter identification method may help facilitate precise prediction of complex jointed connection structures.

关键词： force-displacement curve contact parameters finite element method response surfacemethodology

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池田大作的中国观及其当代价值

北京理工大学学报（社会科学版） 2025年第1期27卷 197-204页

作者：纪亚光孟芮竹南开大学马克思主义学院天津300350

日本思想家池田大作立足于全球视野,剖析西方现代文明中的困境,在西方现代化危机的背景下考察中国,多次访华探讨对中国的认知。从传统向现代演进的线索缕析其诸多论述,可以看到池田大作中国观的多重面向:一方面,池田大作关注到中国“以... 详细信息

日本思想家池田大作立足于全球视野,剖析西方现代文明中的困境,在西方现代化危机的背景下考察中国,多次访华探讨对中国的认知。从传统向现代演进的线索缕析其诸多论述,可以看到池田大作中国观的多重面向:一方面,池田大作关注到中国“以人为本”历史传统理念的现代意义,另一方面,他对新中国成立以来中国共产党基于传统进行史观上的思想革命、注重民众与政党自身的精神变革、顺应时代所需灵活运用马克思主义、以捍卫主权统一和发展自主性的原则开创多元价值的现代化表示赞赏。池田大作从时空维度明晰“现代化”不等于“西方化”,阐释中国传统中的精神智慧具有超越于西方现代化的可能,从人类文明演进的视野剖析中国共产党对“以人为本”传统的延续,为理解中国式现代化为何必须走自己的路、必须坚持以“第二个结合”为方向指引、必须坚持中国共产党的领导,予以一定启迪和借鉴。

关键词：池田大作中国观以人为本中国式现代化

Effect of Mineralized Layer Topographies on Stem Cell Behavior in Microsphere Scaffold

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Journal of Materials Science & Technology 2016年第9期32卷 971-977页

作者： Jie Hou Huichang Gao Ying,jun Wang delin Cheng Xiaodong Cao School of Materials Science and Engineering South China University of TechnologyGuangzhou 510641China National Engineering Research Center for Tissue Restoration and Reconstruction Cuangzhou 510006China Guangdong Province Key Laboratory of Biomedical Engineering South China University of TechnologyGuangzhou 510006China Center for Human Tissues and Organs Degeneration Shenzhen Institutes of Advanced TechnologyChinese Academy o~SciencesShenzhen 518055China

Modifying substrates through mineralization is a popular way to improve the osteogenic performance. Screening of the best mineralization characteristics on specific substrates for stem cells is meaningful but not fully studied. In this paper, poly（lactic-co-glycolic acid）/hydroxyapatite （PLGA[HA, PH） microsphere scaffolds with superficial pores were fabricated by a low-temperature fusion method. After the mineralization in the 5x stimulated body fluid （SBF） for 0, 7, 12 and 24 h, four mineralized scaffolds （MPH-0, MPH-7, MPH-12 and MPH-24） with different apatite topographies were obtained. It was found that the surface of MPH-7 was evenly decorated with abundant micro-pores, MPH-12 with dense and plain apatite layer, and MPH-24 with small spherical bumps. The responses of mouse bone mesenchymal stem cells （mBMSCs） to the four scaffolds were further studied. The results showed that MPH-7 and MPH-24 had more obvious effects on mBMSCs attachment, proliferation and differentiation than MPH-0 and MPH- 12. This work indicated that to obtain the maximum improvement, the mineralization characteristics had to be carefully chosen. This was noteworthy in the chemical modification of surfaces to form the functionalized scaffolds for bone repair.

关键词： Microsphere scaffold Mineralization Topography Cell behavior

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本科生全程导师制的价值意蕴及实践探索

北京科技大学学报（社会科学版） 2025年第1期41卷 32-38页

作者：赵萌北京科技大学北京100083

本科教育在人才培养工作中占据基础地位,如何推动本科教育理念和方式不断变革,谋求本科教育体制机制的创新发展是提升教育质量的关键所在。本科生全程导师制从学生多样化、个性化的需求出发,注重因材施教,逐渐成为提升人才培养质量的关... 详细信息

本科教育在人才培养工作中占据基础地位,如何推动本科教育理念和方式不断变革,谋求本科教育体制机制的创新发展是提升教育质量的关键所在。本科生全程导师制从学生多样化、个性化的需求出发,注重因材施教,逐渐成为提升人才培养质量的关键手段之一,并在教学实践中不断得到创新和优化。文章以北京科技大学近年来推行的本科生全程导师制为例,针对8921名本科生进行在校生满意度调查,分析得出该导师制在思想引导、学术指导以及创业就业等方面充分发挥了教师的积极作用,获得了广大学生的高度认可,由此探索构建符合新时代人才培养需求的本科人才培养新模式。

关键词：本科生全程导师制人才培养学生满意度

Comparative study on microstructure evolution and failure mechanisms of ordinary and refurbished EB-PVD TBC under cyclic oxidation

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Journal of Advanced Ceramics 2023年第9期12卷 1805-1820页

作者： Pan Li Xiaochao Jin Pin Lu delin Liu Rende Mou Xueling Fan Xi’an Key Laboratory of Extreme Environmental Serviceability and Protection Technologies School of Aerospace EngineeringXi’an Jiaotong UniversityXi’an 710049China AECC Beijing Institute of Aeronautical Materials Beijing 100095China

Refurbishment of thermal barrier coating(TBC)has become a valuable technique to prolong the service life of high-temperature *** study investigates the effect of the refurbishment process(coating removal and recoating)on the microstructure evolution and physical properties of TBC,including oxidation characteristics,element diffusion behavior,and crack failure *** results showed that a certain amount of interdiffusion zone(IDZ)with Cr-rich would be retained in DD6 superalloy substrate after coating *** microstructure of the refurbished specimens showed equiaxedβ-NiAl phases,while the ordinary specimens have elongated grain shapes with a high aspect ***,mixed oxides in the refurbished TBC specimens were earlier observed during cyclic oxidation,with a greater thickness compared to ordinary TBC,due to the influence of BC layer phase *** growth mechanism of thermally grown oxide(TGO-Al_(2)O_(3)layer)in the refurbished TBC specimens was also different,resulting from the different mechanisms of mixed oxides ***,under cyclic oxidation with water quenching at 1100℃,the cracks in the refurbished specimen tend to occur in the mixed oxides layer,while the cracks in the ordinary specimen occur in the top coat(TC)layer,attributing to the earlier and thicker mixed oxides layer formed in refurbished specimens.

关键词： thermal barrier coating(TBC)systems coating removal refurbishment cyclic oxidation microstructure evolution failure mechanism

Isolation, Expression and Characterization of rbc L Gene from Ulva prolifera J. Agardh(Ulvophyceae, Chlorophyta)

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Journal of Ocean University of China 2015年第6期14卷 1087-1095页

作者： SHAO Zhanru LI Wei GUO Hui DUAN delin Institute of Oceanology Chinese Academy of Sciences Institute of General Botany and Plant Physiology Friedrich Schiller University University of Chinese Academy of Sciences

Ulva prolifera is a typical green alga in subtidal areas and can grow tremendously fast. A highly efficient Rubisco enzyme which is encoded by Up Rbc L gene may contribute to the rapid growth. In this study, the full-length Up Rbc L open reading frame(ORF) was identified, which encoded a protein of 474 amino acids. Phylogenetic analysis of Up Rbc L sequences revealed that Chlorophyta had a closer genetic relationship with higher plants than with Rhodophyta and Phaeophyta. The two distinct residues(aa11 and aa91) were presumed to be unique for Rubisco catalytic activity. The predicted three-dimensional structure showed that one α/β-barrel existed in the C-terminal region, and the sites for Mg^(2+)coordination and CO_2 fixation were also located in this region. Gene expression profile indicated that Up Rbc L was expressed at a higher level under light exposure than in darkness. When the culture temperature reached 35℃, the expression level of Up Rbc L was 2.5-fold lower than at 15℃, and the carboxylase activity exhibited 13.8-fold decrease. Up Rbc L was heterologously expressed in E. coli and was purified by Ni^(2+) affinity chromatography. The physiological and biochemical characterization of recombinant Rubisco will be explored in the future.

关键词： Ribulose-1,5-bisphosphate carboxylase/oxygenase large subunit sequence analysis real-time PCR in vitro expres-sion Ulva prolifera

Segment differential aggregation representation and supervised compensation learning of ConvNets for human action recognition

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Science China(Technological Sciences) 2024年第1期67卷 197-208页

作者： REN ZiLiang ZHANG QieShi CHENG Qin XU ZhenYu YUAN Shuai LUO delin School of Computer Science and Technology Dongguan University of TechnologyDongguan 523808China Shenzhen Institute of Advanced Technology Chinese Academy of SciencesShenzhen 518055China School of Electronic Engineering and Automation Guilin University of Electronic TechnologyGuilin 541004China Department of the mechanical engineering Erlangen-Nuremberg UniversityErlangen 91508Germany School of Aerospace Engineering Xiamen UniversityXiamen 361102China

With more multi-modal data available for visual classification tasks,human action recognition has become an increasingly attractive ***,one of the main challenges is to effectively extract complementary features from different modalities for action *** this work,a novel multimodal supervised learning framework based on convolution neural networks(Conv Nets)is proposed to facilitate extracting the compensation features from different modalities for human action *** on information aggregation mechanism and deep Conv Nets,our recognition framework represents spatial-temporal information from the base modalities by a designed frame difference aggregation spatial-temporal module(FDA-STM),that the networks bridges information from skeleton data through a multimodal supervised compensation block(SCB)to supervise the extraction of compensation *** evaluate the proposed recognition framework on three human action datasets,including NTU RGB+D 60,NTU RGB+D 120,and *** results demonstrate that our model with FDA-STM and SCB achieves the state-of-the-art recognition performance on three benchmark datasets.

关键词： action recognition segment frame difference aggregation supervised compensation learning ConvNets

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Multiple Time Scale Analysis of River Runoff Using Wavelet Transform for Dagujia River Basin, Yantai, China

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Chinese Geographical Science 2009年第2期19卷 158-167页

作者： LIU delin LILT Xianzhao LI Bicheng ZHAO Shiwei LI Xiguo Research Center of Soil and Water Conservation and Ecological Environment Chinese Academy of Sciences and Ministry of Education Northwest Sci-Tech University of Agriculture and Forestry Yangling 712100 China College of Geography and Resource Management Ludong University Yantai 264025 China Yantai Hydrology and Water Resource Survey Office Yantai 264025 China Graduate University of the Chinese Academy of Sciences Beijing 100049 China

Based on monthly river runoff and meteorological data, a method of Morlet wavelet transform was used to analyze the multiple time scale characteristics of river runoff in the Dagujia River Basin, Yantai City, Shandong Province. The results showed that the total annual river runoffin the Dagujia River Basin decreased significantly from 1966 to 2004, and the rate of decrease was 48× 10^6ma/10yr, which was higher than the mean value of most rivers in China. Multiple time scale characteristics existed, which accounted for different aspects of the changes in annual river runoff, and the major periods of the runofftime series were identified as about 28 years, 14 years and 4 years with decreasing levels of fluctuation. The river runoff evolution process was controlled by changes in precipitation to a certain extent, but it was also greatly influenced by human activities. Also, for different time periods and scales, the impacts of climate changes and human activities on annual river runoff evolution occurred at the same time. Changes in the annual river runoffwere mainly associated with climate change before the 1980s and with human activities after 1981.

关键词： multiple time scale river runoff climate change Morlet wavelet transform Dagujia River

Is it possible to foot reflexology for infants with sensorineural hearing loss?

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World Journal of Clinical Cases 2025年第2期13卷 1-4页

作者： Min Ai Hang-Hang Zhang Jun-Bang Feng Chuan-Ming Li Wen-Jing Wang meng-Die Hu Department of Anesthesiology Nanan District People's Hospital of ChongqingChongqing 400060China Department of Breast and Thyroid Surgery Chongqing Bishan District Maternal and Child Health Care HospitalChongqing 402760China Department of Medical Imaging Chongqing University Central HospitalChongqing 400014China

Foot reflexology is a non-invasive and safe complementary therapy that works by massaging the reflex zones of the feet and exerts systemic or whole-body regulation through meridian nerve *** therapy is commonly used in the treatment of various conditions such as autism and Parkinson's ***,there is limited reporting on the use of foot reflexology therapy for infants with sensorineural hearing loss(SNHL).Currently,there is no definitive conclusion on how foot reflexology therapy can influence *** editorial holds some guiding significance regarding this clinical *** aim is to present physiological evidence of how foot reflexology therapy can impact infants with SNHL,thereby enhancing clinician’s awareness of foot reflexology in treating infants with SNHL.

关键词： Foot reflexology Sensorineural Hearing Loss Future perspectives Limitations Neural conduction