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人口老龄化视角下的家庭金融资产配置——基于CHFS的分析

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贵州大学学报（社会科学版） 2024年第4期42卷 44-63页

作者：张云尹艺霏南开大学经济学院天津300071

为探究人口老龄化对于金融资产配置的影响,本文基于2019年中国家庭金融调查(CHFS),从深度与广度两个层面探究了家庭金融资产配置的生命周期特征。研究发现,风险资产比重在青壮年时期变化不大,而在55岁之后显著减少;股票资产占比、风险... 详细信息

为探究人口老龄化对于金融资产配置的影响,本文基于2019年中国家庭金融调查(CHFS),从深度与广度两个层面探究了家庭金融资产配置的生命周期特征。研究发现,风险资产比重在青壮年时期变化不大,而在55岁之后显著减少;股票资产占比、风险资产种数与年龄呈倒U型关系,并在45至55岁达到峰值;现金与银行存款的占比与年龄呈正相关关系。与此同时,本文分析了老龄化程度加深对家庭金融资产配置的影响,发现老年人口占比提升对家庭风险金融市场参与和风险资产配置产生了显著的抑制作用,而这一抑制作用受养老保险覆盖率与收入的调节,并存在地域异质性。机制分析发现,主观风险态度与金融素养是年龄结构影响家庭金融资产配置的重要途径。最后,针对我国人口老龄化背景下的家庭金融资产配置问题,本文结合实证所得结论提出相应的政策建议。

关键词：人口老龄化生命周期金融资产配置金融市场参与

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北疆文化的价值实现与社会影响

南京林业大学学报（人文社会科学版） 2024年第3期24卷 108-119页

作者：张笑会尹逸飞内蒙古大学民族学与社会学学院

北疆文化作为地域性文化,既延续了中华民族传统文化的优良品质,也充分展现了北疆区域鲜明的文化特色。北疆文化的价值实现对铸牢中华民族共同体意识具有重要的现实意义,北疆文化建设也为铸牢中华民族共同体意识提供了重要抓手。从文化... 详细信息

北疆文化作为地域性文化,既延续了中华民族传统文化的优良品质,也充分展现了北疆区域鲜明的文化特色。北疆文化的价值实现对铸牢中华民族共同体意识具有重要的现实意义,北疆文化建设也为铸牢中华民族共同体意识提供了重要抓手。从文化社会学结构主义的视角出发,科学诠释北疆文化的定位和研究路径,细化北疆文化所具有的时代精神、群体凝聚、符号系统和制度体系的价值面向,并深入探讨北疆文化价值实现路径和社会功能发挥内在机制,既可为铸牢中华民族共同体意识和建设中华民族共有美好精神家园提供社会学学科视角的理论支持,又能拓展和丰富文化社会学领域的地域文化研究经验。

关键词：北疆文化价值实现文化影响力文化社会学

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Experimental Investigation of the Creep Behaviour of Glulam Compression-Bending Members

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Journal of Renewable Materials 2022年第6期10卷 1517-1535页

作者： yifei yin Lirong Qu Weidong Lu Chengshuai Li College of Civil Engineering Nanjing Tech UniversityNanjing211816China

Creep test results of glulam members under compression and bending were studied in this *** creep tests were conducted to investigate the influence of the stress level and relative eccentricity on the creep deformation of glulam *** test results showed that the creep deformation trends of glulam members under long-term compression and bending loading were similar;the creep deformation increased with increases in both the stress level and relative ***,the relative creep deformation decreased with the increase in both the stress level and relative eccentricity under long-term loading,and a five-parameter creep model was proposed to analyse the creep mechanism of glulam members under compression and *** good fitness of the test results indicated that the five-parameter model was able to accurately simulate the creep deformation of glulam compression-bending ***,a numerical model was developed using the creep equation,which was related to the parameter a and *** simulation results were in good agreement with the test results,and the parameters a and b were correlated to the relative eccentricity and stress level,*** on the corrected parameters a and b,the relative creep deformation of glulam compression-bending members was predicted over 50 years.

关键词： Glulam compression-bending members creep stress level relative eccentricity

CCM-FL:Covert communication mechanisms for federated learning in crowd sensing IoT

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Digital Communications and Networks 2024年第3期10卷 597-608页

作者： Hongruo Zhang yifei Zou Haofei yin Dongxiao Yu Xiuzhen Cheng Institute of Intelligent Computing School of Computer Science and TechnologyShandong UniversityQingdao266237China

The past decades have witnessed a wide application of federated learning in crowd sensing,to handle the numerous data collected by the sensors and provide the users with precise and customized ***,how to protect the private information of users in federated learning has become an important research *** with the differential privacy(DP)technique and secure multiparty computation(SMC)strategy,the covert communication mechanism in federated learning is more efficient and energy-saving in training the ma-chine learning *** this paper,we study the covert communication problem for federated learning in crowd sensing Internet-of-Things *** from the previous works about covert communication in federated learning,most of which are considered in a centralized framework and experimental-based,we firstly proposes a centralized covert communication mechanism for federated learning among n learning agents,the time complexity of which is O(log n),approximating to the optimal ***,for the federated learning without parameter server,which is a harder case,we show that solving such a problem is NP-hard and prove the existence of a distributed covert communication mechanism with O(log logΔlog n)times,approximating to the optimal solution.Δis the maximum distance between any pair of learning *** analysis and nu-merical simulations are presented to show the performance of our covert communication *** hope that our covert communication work can shed some light on how to protect the privacy of federated learning in crowd sensing from the view of communications.

关键词： Covert communications Federated learning Crowd sensing SINR model

Fine structure and facet analyses of tunnel-structured FeOOH nanocrystals

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Progress in Natural Science:Materials International 2024年第1期34卷 172-177页

作者： Xuemei Zeng Yanshuai Li Wenjun Song Yun Li Dewu yin yifei Yuan Kun He College of Chemistry and Materials Engineering Wenzhou University

The development of energy storage systems in the future relies on identifying suitable target materials and synthesizing target materials with controllable physicochemical properties to unlock their electrochemical contributions. Based on the structure-property-performance relationship established in materials science, it is crucial to determine the fine structure of key functional materials. Among these materials, tunnel-structured β-FeOOH is widely studied due to its low-cost, decent performance and environmental friendliness; yet, its fine structure in terms of the atomic framework and surface configuration has not been well understood. In this work, we successfully synthesized β-FeOOH nanorods and analyzed their crystallographic features via transmission electron microscopy(TEM). By combining ultramicrotome and aberration-corrected scanning TEM with atomic resolution,we first experimentally revealed the structural details of β-FeOOH featuring 1 × 1 tunnels and 2 × 2 tunnels along the c-axis([001]), the same as the nanorod growth direction. The dominant exposed facets of β-FeOOH nanorods were further revealed to be {010}. Such fine structural elucidation unveils the long-existing mystery in this material system, which is expected to contribute to structural/compositional engineering toward functionality optimization in the near future.

关键词： β-FeOOH tunnel Anisotropic growth Atomic resolution Nanorod Energy storage

Characteristics Variation of Atmospheric CO_(2)and CH_(4)in Yongxing Island,South China Sea

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Journal of Ocean University of China 2024年第2期23卷 438-446页

作者： LV Honggang JIANG yifei WANG Haiyan Key Laboratory of Marine Hazards Forecasting National Marine Environmental Forecasting CenterMinistry of Natural Resources(MNR)Beijing 100081China National Marine Environmental Forecasting Center Beijing 100081China

Using the observation data in Yongxing Island,South China Sea(SCS)from December 2013 to November 2018,the multiple time scales variation of atmospheric CO_(2)and CH_(4)were analyzed to understand their temporal variation characteristics and controlling *** regional-averaged background mole fractions of CO_(2)and CH_(4)both show a single-period sinusoidal variation with a lower value at noon and a higher value in the wee *** the seasonal scale,they exhibited a significant seasonal difference with higher values in winter and lower values in *** the annual scale,CO_(2)and CH_(4)both show an increasing trend,with an annual growth rate of approximately 3.2 ppm and 12 ppb,*** annual growth rate at this site was higher than the global *** change in atmospheric CO_(2)and CH_(4)in Yongxing Island was probably caused by the higher emission of the surrounding areas and the airflows driven by ***,the long-term and high-resolution greenhouse gases(GHGs)dataset will aid relevent researchers and decision-makers in performing more in-depth studies for GHG sources in order to derive effective strategies.

关键词： carbon dioxide methane observation backward trajectory atmospheric transport

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Real-Time 3D Ultrasound Imaging System Based on a Hybrid Reconstruction Algorithm

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Chinese Journal of Electronics 2024年第1期33卷 245-255页

作者： yifei LYU Yu SHEN Mingbo ZHANG Junchen WANG School of Mechanical Engineering and Automation Beihang University The First Medical Center General Hospital of Chinese PLA

As a safe and convenient imaging technology in clinical routine diagnosis, ultrasound imaging can provide real-time 2D images of internal tissues and organs. To realize real-time 3D image reconstruction, pixel nearest neighbor interpolation(PNN) reconstruction algorithm and Bezier interpolation algorithm are combined into a hybrid reconstruction algorithm. On this basis, a real-time interactive 3D ultrasound imaging system is *** temporal calibration and spatial calibration, the six degrees of freedom poses of 2D ultrasound images can be accurately collected. The 3D volume reconstructed by the proposed 3D reconstruction algorithm is visualized by volume rendering. A multi-thread software system allows parallel operation of data acquisition, 3D reconstruction,volume visualization and other functions. 3D imaging experiments on a 3D printing femur model, a neck phantom and the neck of human volunteers were performed for systematic evaluation. When the reconstruction voxel size was set to be(0.53 mm3, 1.03 mm3, 1.53 mm3), the reconstruction errors of the femur and trachea model were respectively(0.23 mm, 0.31 mm, 0.56 mm) and(0.62 mm, 0.88 mm, 1.41 mm). Clinical feasibility was demonstrated by application of the 3D ultrasound imaging on the neck of human volunteers.

关键词： Interpolation Three-dimensional displays Ultrasonic imaging Imaging Data visualization Reconstruction algorithms Real-time systems

Causal relationship between circulating vitamin C and 25-hydroxyvitamin D concentrations and common mental disorders-a Mendelian randomization study

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Food Science and Human Wellness 2024年第4期13卷 1877-1885页

作者： Yuanyuan Wang Lirong Dong Meng Zhao Shiyu yin Pan Da Dengfeng Xu yifei Lu Jiayue Xia Niannian Wang Shaokang Wang Guiju Sun Key Laboratory of Environmental Medicine and Engineering of Ministry of Education and Department of Nutrition and Food HygieneSchool of Public HealthSoutheast UniversityNanjing 210009China Department of Integrated Service and Management Jiangsu Provincial Center for Disease Control and PreventionNanjing 210009China

Mental disorders seriously affect people’s health and social *** Mendelian randomization(MR)study was designed to investigate the causal relationship between circulating vitamin C(VC)or 25-hydroxyvitamin D(25(OH)D)levels and mental *** data used for the MR analysis were derived from the summary genome-wide association studies(GWAS)database for VC and 25(OH)D and from the Finn Gen consortium for fourteen mental *** on the inverse variance weighted(IVW)method,we found a potential causal association between circulating VC and anxiety disorders(IVW:OR=1.139,95%CI:1.023-1.269,P=0.018).However,no causal association was found between VC or 25(OH)D and other mental disorders(P>0.05).In the reverse MR analysis,individuals with Alzheimer’s disease was causally associated with higher concentrations of circulating VC(P=0.012),while individuals with anxiety disorders had a negative association between the concentrations of 25(OH)D(P=0.012).However,the current evidence does not support a causal relationship between VC or 25(OH)D and other mental *** addition,there was no causal association between circulating VC and 25(OH)D(P>0.05).Future studies are needed to confirm these findings and to elucidate the mechanisms of potential causality.

关键词： Circulating vitamin C 25-Hydroxyvitamin D Mental disorder Mendelian randomization

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Enhanced homing of mesenchymal stem cells for in situ niche remodeling and bone regeneration

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Nano Research 2024年第8期17卷 7449-7460页

作者： yin Yuan Lijun Chen Jing Yang Sining Zhou Yangxin Fang Qi Zhang Ning Zhang yifei Li Li Yuan Fan Jia Shuo Ni Charlie Xiang State Key Laboratory for Diagnosis and Treatment of Infectious Diseases National Clinical Research Center for Infectious DiseasesNational Medical Center for Infectious DiseasesCollaborative Innovation Center for Diagnosis and Treatment of Infectious DiseasesThe First Affiliated HospitalZhejiang University School of MedicineHangzhou 310003China Department of Biology The David H.Koch Institute for Integrative Cancer Research at MITMassachusetts Institute of TechnologyCambridgeMA 02139USA Research Units of Infectious disease and Microecology Chinese Academy of Medical SciencesHangzhou 310003China Innovative Precision Medicine(IPM)Group Hangzhou 311215China MOE Key Laboratory of Macromolecule Synthesis and Functionalization of Ministry of Education Department of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027China Key Laboratory of Cardiovascular Intervention and Regenerative Medicine of Zhejiang Province Department of CardiologySir Run Run Shaw HospitalZhejiang University School of MedicineHangzhou 310016China Department of Cancer Immunology and Virology Dana-Farber Cancer InstituteBostonMA 02215USADepartment of ImmunologyHarvard Medical SchoolBoston MA 02115USA Department of Orthopedic Surgery and Shanghai Institute of Microsurgery on Extremities Shanghai Sixth People’s Hospital Affiliated to Shanghai Jiaotong University School of MedicineShanghai 200233China

Mesenchymal stem cells(MSCs)transplantation is a promising strategy for osteoporosis ***,limited sources and poor tissue-homing efficiency limit their clinical *** this study,we isolated a kind of MSCs from women’s menstrual blood(MenSCs)noninvasively and established a novel MSCs bone marrow-targeted delivery system by utilizing waterin-oil-in-water droplet *** were encapsulated withinβ-cyclodextrin-functionalized alginate microcapsules loaded with zoledronates,which has a high affinity for *** this delivery system,MenSCs could be preferentially delivered to the bone marrow tissues via intravenous infusion,and restored bone mass by remodeling the bone marrow niche in situ in ovariectomized mouse ***,scRNA-seq analysis demonstrated that those MenSCs homed to the bone marrow recruited CD4^(+)FOXP3^(+)natural regulatory T(nT_(reg))cells by secreting *** recruited nTreg promoted CD8^(+)T cells to secret Wnt family member 10B(WNT10B),activating the Wnt signaling in osteoblasts and thus promoting bone formation in situ in the bone *** study reveals a promising application of MenSCs in postmenopausal osteoporosis treatment and highlights the clinical value of MenSCs by encouraging women to reserve autologous MenSCs before menopause to prevent and alleviate postmenopausal osteoporosis.

关键词： mesenchymal stem cells microfluidics bone marrow homing stem cell niche postmenopausal osteoporosis