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银发经济中备老人群消费特征与发展趋势研究

新疆师范大学学报（哲学社会科学版） 2025年第2期46卷 48-58,F0002页

作者：彭希哲陈倩复旦大学老龄研究院上海200433

银发经济已成为我国未来经济持续增长的重要领域,发展银发经济需要从供给和需求两方面同时发力。银发经济有特定的年龄针对性,文本关注银发经济中未老阶段的备老经济。备老人群呈现身体健康状况良好、预期寿命持续延长,文化教育水平较... 详细信息

银发经济已成为我国未来经济持续增长的重要领域,发展银发经济需要从供给和需求两方面同时发力。银发经济有特定的年龄针对性,文本关注银发经济中未老阶段的备老经济。备老人群呈现身体健康状况良好、预期寿命持续延长,文化教育水平较高、消费观念开放包容,互联网普及程度较高、消费个性化、注重悦己等群体特征,具有较强的消费能力和消费意愿,备老人群的消费将为银发经济带来巨大的增量空间。深入理解并满足备老人群的消费需求,对推动供需在更高水平实现良性循环、促进银发经济高质量发展具有重要意义。

关键词：银发经济备老经济高质量发展良性循环消费特征

Experimental and numerical study on the growth and collapse of a bubble in a narrow tube

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Acta Mechanica Sinica 2012年第5期28卷 1248-1260页

作者： Bao-Yu ni A-Man Zhang qian-xi Wang Bin Wang College of Shipbuilding Engineering Harbin Engineering University School of Mathematics University of Birmingham National Key Laboratory of Shock Wave and Detonation Physics Institute of Fluid Physics

The growth, expansion and collapse of a bubble in a narrow tube are studied using both experiments and numerical simulations. In experiment, the bubble is generated by an electric spark in a water tank and recorded by a highspeed camera system. In numerical simulation, the evolution of the bubble is solved by adopting axisymmetric boundary integral equation, considering the surface tension effect. The results of experiments and numerical simulations are compared and good agreements are achieved. Both of them show that a counter-jet forms and penetrates the bubble at the end of the collapse stage, before a ring type bubble forms. Under the attraction of the tube wall due to Bjerknes force, a ring jet is generated, pointing towards the tube. On the basis of this, some physical quantities like the pressure on the tube wall and kinetic energy are calculated in a case study. The effects of tube diameters and tube lengths on the bubble＇s behaviors are also investigated.

关键词： Narrow tube Ring bubble Counter-jet Ringjet Bubble experiment

Recent progress in MnBi2nTe3n+1 intrinsic magnetic topological insulators: crystal growth, magnetism and chemical disorder

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National Science Review 2024年第2期11卷 65-80页

作者： Chaowei Hu Tiema qian ni ni Department of Physics and Astronomy and California Nano Systems Institute University of California-Los Angeles

The search for magnetic topological materials has been at the forefront of condensed matter research for their potential to host exotic states such as axion insulators, magnetic Weyl semimetals, Chern insulators,etc. To date, the MnBi2nTe3n+1family is the only group of materials showcasing van der Waals-layered structures, intrinsic magnetism and non-trivial band topology without trivial bands at the Fermi level. The interplay between magnetism and band topology in this family has led to the proposal of various topological phenomena, including the quantum anomalous Hall effect, quantum spin Hall effect and quantum magnetoelectric effect. Among these, the quantum anomalous Hall effect has been experimentally observed at record-high temperatures, highlighting the unprecedented potential of this family of materials in fundamental science and technological innovation. In this paper, we provide a comprehensive review of the research progress in this intrinsic magnetic topological insulator family, with a focus on single-crystal growth, characterization of chemical disorder, manipulation of magnetism through chemical substitution and external pressure, and important questions that remain to be conclusively answered.

关键词： MnBi2Te4 magnetic topological insulator magnetism tuning antiferromagnetism ferromagnetism pressure chemical doping

Identification of key genes involved in axon regeneration and Wallerian degeneration by weighted gene co-expression network analysis

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Neural Regeneration Research 2022年第4期17卷 911-919页

作者： Yan Lu Qi Shan Mei Ling xi-An ni Su-Su Mao Bin Yu qian-qian Cao Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education Co-innovation Center of NeuroregenerationNantong UniversityNantongJiangsu ProvinceChina School of Life Sciences Nantong UniversityNantongJiangsu ProvinceChina

Peripheral nerve injury repair requires a certain degree of cooperation between axon regeneration and Wallerian ***,investigating how axon regeneration and degeneration work together to repair peripheral nerve injury may uncover the molecular mechanisms and signal cascades underlying peripheral nerve repair and provide potential strategies for improving the low axon regeneration capacity of the central nervous *** this study,we applied weighted gene co-expression network analysis to identify differentially expressed genes in proximal and distal sciatic nerve segments from rats with sciatic nerve *** identified 31 and 15 co-expression modules from the proximal and distal sciatic nerve segments,*** enrichment analysis revealed that the differentially expressed genes in proximal modules promoted regeneration,while the differentially expressed genes in distal modules promoted ***,we constructed hub gene networks for selected modules and identified a key hub gene,Kif22,which was up-regulated in both nerve *** vitro experiments confirmed that Kif22 knockdown inhibited proliferation and migration of Schwann cells by modulating the activity of the extracellular signal-regulated kinase signaling ***,our findings provide a comparative framework of gene modules that are co-expressed in injured proximal and distal sciatic nerve segments,and identify Kif22 as a potential therapeutic target for promoting peripheral nerve injury repair via Schwann cell proliferation and *** animal experiments were approved by the Institutional Animal Ethics Committee of Nantong University,China(approval No.S20210322-008)on March 22,2021.

关键词： axon regeneration extracellular signal-regulated kinase signaling pathway hub genes Kif22 peripheral nerve injury protein kinase Cα Schwann cells Wallerian degeneration weighted gene co-expression network analysis

Asymptotics of the solution to a stationary piecewise-smooth reaction-diffusion equation with a multiple root of the degenerate equation

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Science China Mathematics 2022年第2期65卷 291-308页

作者： qian Yang Mingkang ni School of Mathematical Sciences East China Normal UniversityShanghai 200241China Shanghai Key Laboratory of Pure Mathematics and Mathematical Practice Shanghai 200241China

A piecewise-smooth second-order singularly perturbed differential equation whose right-hand side is a nonlinear function with a discontinuity on some curve is investigated. This is a new class of problems in the case where the degenerate equation has a multiple root on the left-hand side of the curve which separates the domain and an isolated root on the right-hand side of that curve. The asymptotics of a solution with an internal layer near a point on the discontinuous curve and the transition point is constructed. The method to construct the internal layer function is proposed. The behavior of the solution in the internal layer consisting of four zones essentially differs from the case of isolated roots. For sufficiently small parameter values, the existence of a smooth solution with an internal layer from the multiple root of the degenerate equation to the isolated root in the neighborhood of a point on the discontinuous curve is proved. The method can be shown to be effective in the given example.

关键词： reaction-diffusion equation multizonal internal layer asymptotic method piecewise-smooth dynamical system

An Adaptive Collocation Method with Weighted Extended PHT-Splines

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Journal of Systems Science & Complexity 2021年第1期34卷 47-67页

作者： ni qian DENG Jiansong WANG Xuhui School of Mathematical Sciences University of Science and Technology of ChinaHefei 230026China School of Mathematics Hefei University of TechnologyHefei 230009China

This paper presents an adaptive collocation method with weighted extended *** authors modify the classification rules for basis functions based on the relation between the basis vertices and the computational domain. The Gaussian points are chosen to be collocation points since PHT-splines are C1 continuous. The authors also provide relocation techniques to resolve the mismatch problem between the number of basis functions and the number of interpolation conditions. Compared to the traditional Greville collocation method, the new approach has improved accuracy with fewer oscillations. Several numerical examples are also provided to test our the proposed approach.

关键词： Collocation method Gaussian points PHT-splines weighted extended PHT-splines

Mechanistic insight into the synergy between nickel single atoms and nanoparticles on N-doped carbon for electroreduction of CO2

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Journal of Energy Chemistry 2025年第1期100卷 327-336页

作者： Mingdong Sun Wenwen Guan Cailing Chen Chao Wu xiaoling Liu Biao Meng Tao Chen Yu Han Jun Wang Shibo xi Yu Zhou State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical Engineering Nanjing Tech University Advanced Membranes and Porous Materials Center Physical Sciences and Engineering Division King Abdullah University of Science and Technology Institute of Sustainability for Chemicals Energy and Environment A*STAR (Agency for Science Technology and Research) College of Materials Science and Engineering Sichuan University

The synergy of single atoms （SAs） and nanoparticles （NPs） has demonstrated great potential in promoting the electrocatalytic carbon dioxide reduction reaction （CO2RR）;however,the rationalization of the SAs/NPs proportion remains one challenge for the catalyst ***,a ni2+-loaded porous poly（ionic liquids）(PIL) precursor synthesized through the free radical self-polymerization of the ionic liquid monomer,1-allyl-3-vinylimidazolium chloride,was pyrolyzed to prepare the ni,N co-doped carbon materials,in which the proportion of ni SAs and NPs could be facilely modulated by controlling the annealing *** catalyst ni-NC-1000 with a moderate proportion of ni SAs and NPs exhibited high efficiency in the electrocatalytic conversion of CO2into *** ni K-edge X-ray absorption near-edge structure （XANES） spectra and theoretical calculations were conducted to gain insight into the synergy of ni SAs and *** charge transfer from ni NPs to the surrounding carbon layer and then to the ni SAs resulted in the electron-enriched ni SAs active *** the electroreduction of CO2,the coexistence of ni SAs and NPs strengthened the CO2activation and the affinity towards the key intermediate of*COOH,lowering the free energy for the potential-determining*CO2→*COOH step,and therefore promoted the catalysis efficiency.

关键词： Single atom catalyst Synergy effect Carbon catalyst Electrocatalysis

Comprehensive understanding and rational regulation of microenvironment for gas-involving electrochemical reactions

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Carbon Energy 2023年第7期5卷 70-99页

作者： Qiyang Cheng Mengfan Wang Jiajie ni Lifang Zhang Yu Cheng xi Zhou Yufeng Cao Tao qian Chenglin Yan School of Chemistry and Chemical Engineering Nantong UniversityNantongChina Key Laboratory of Core Technology of High Specific Energy Battery and Key Materials for Petroleum and Chemical Industry College of EnergySoochow UniversitySuzhouChina Light Industry Institute of Electrochemical Power Sources Soochow UniversitySuzhouChina

Substantial progress has been made in the understanding of gas-involving electrochemical reactions recently for the sake of clean,renewable,and efficient energy ***,the specific influence mechanism of the microenvironment at the reaction interface on the electrocatalytic performance(activity,selectivity,and durability)remains ***,we provide a comprehensive understanding of the interfacial microenvironment of gas-involving electrocatalysis,including carbon dioxide reduction reaction and nitrogen reduction reaction,and classify the factors affecting the reaction thermodynamics and kinetics into gas diffusion,proton supply,and electron *** categorization allows a systematic survey of the literature focusing on electrolyzer-level(optimization of the device,control of the experimental condition,and design of the working electrode),electrolytelevel(increase of gas solubility,regulation of proton supply,and substitution of anodic reaction),and electrocatalyst-level strategies(promotion of gas affinity,adjustment of hydrophobicity,and enhancement of conductivity),aiming to retrieve the correlations between the microenvironment and electrochemical ***,priorities for future studies are suggested to support the comprehensive improvement of next-generation gas-involving electrochemical reactions.

关键词： CO_(2)RR electrocatalysis microenvironment NRR three-phase interface

Finite dimensional of Brownian rough characteristic functions path

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Frontiers of Mathematics in China 2017年第4期12卷 859-877页

作者： xi GENG Zhongmin qian Department of Mathematical Sciences Carnegie Mellon UniversityPittsburgh PA 15217 US Mathematical Institute University of Oxford Oxford OX2 6GG UK

The Brownian rough path is the canonical lifting of Brownian motion to the free nilpotent Lie group of order 2. Equivalently, it is a process taking values in the algebra of Lie polynomials of degree 2, which is described explicitly by the Brownian motion coupled with its area process. The aim of this article is to compute the finite dimensional characteristic functions of the Brownian rough path in IRd and obtain an explicit formula for the case when d = 2.

关键词： Brownian rough paths finite dimensional characteristic functions,Riccati system