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全民健身背景下用户在线健身需求体系构建与分析——基于Word2Vec-IPA模型的研究

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北京体育大学学报 2024年第4期47卷 131-143页

作者：郭家欣崔乐泉郑州大学管理学院河南郑州450001 郑州大学体育学院(校本部) 河南郑州450001

精准识别并深入分析健身App用户需求,对于推动健身App发展和优化大众在线健身体验具有重要价值。基于健身App在线评论数据,运用Word2Vec模型和K-means++算法精准识别用户在线健身需求,构建在线健身需求体系,并结合IPA模型分析各需求维... 详细信息

精准识别并深入分析健身App用户需求,对于推动健身App发展和优化大众在线健身体验具有重要价值。基于健身App在线评论数据,运用Word2Vec模型和K-means++算法精准识别用户在线健身需求,构建在线健身需求体系,并结合IPA模型分析各需求维度关注度与满意度及两者间关系。结果显示,在线健身需求体系由4个维度构成:服务(基本功能属性/付费会员体验)、信息(运动数据记录/健身信息资源)、交互(社会交流互动/情感交流反馈)及技术(页面布局设计/技术设备支持)。其中,用户高度关注基本功能属性和健身信息资源且满意度较高,应采取优势保持策略;运动数据记录和设备技术支持满意度较低,但关注度较高,应重点优化;其他子维度的关注度较低,建议采取低优先改进策略。研究解决了以往用户在线健身需求研究的主观性和片面性问题,识别了市场与真实需求之间的对接不足,为在线健身产业优化方向提供了指导。

关键词：在线评论健身App Word2Vec模型 IPA模型需求体系

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我国矿区土地复垦关键政策实施情况调查分析

中国土地科学 2024年第5期38卷 1-11页

作者：胡振琪郭家新赵艳玲王振中国矿业大学环境与测绘学院江苏徐州221116 中国矿业大学(北京)土地复垦与生态重建研究所北京100083 北京大学城市与环境学院北京100871

研究目的:调查土地复垦4项关键政策的实施情况,判断政策失灵与否,并分析其失灵原因,为相关政策修订提供科学支撑。研究方法:问卷调查法,统计分析法和定量分析法。研究结果:(1)三类受访者认为“谁损毁,谁复垦”政策不完善的比例为65.30%... 详细信息

研究目的:调查土地复垦4项关键政策的实施情况,判断政策失灵与否,并分析其失灵原因,为相关政策修订提供科学支撑。研究方法:问卷调查法,统计分析法和定量分析法。研究结果:(1)三类受访者认为“谁损毁,谁复垦”政策不完善的比例为65.30%,其中第三方不完善比例高达92.02%,同时三类受访者一致赞同应由政府牵头复垦。(2)在编制土地复垦方案方面,三类受访者表示“不完善”(49.74%)略高于“赞成”(47.01%),其中第三方不完善的比例高达89.57%;矿山企业认为方案实施率较高,但政府部门(26.74%)和第三方(3.07%)表示方案落实不力。(3)矿山企业高度赞成采矿临时用地政策,但三类受访者一致认为政策执行率低,其中“0%执行”比例中政府为22.40%、矿山企业为23.92%、第三方高达91.41%,表明该政策执行率较低,需要改革和完善。(4)三类受访者赞成“边开采、边复垦”比例为43.59%、“不完善”为53.68%,其中第三方认为不完善的比例高达77.30%;政府和矿山企业都表示执行率较好,但第三方认为执行率仅为11.65%;政府(52.80%)和矿山企业(74.41%)不了解“边采边复”技术是政策实施不力的原因之一。研究结论:(1)“谁损毁,谁复垦”、编制“土地复垦方案”、“采矿临时用地”和“边开采,边复垦”4项关键政策的总体失灵度分别为51.11%、56.92%、89.23%和50.43%,均高于50%,同时第三方认为失灵度分别为92.03%、96.93%、98.77%和88.35%,表明4项政策都需要完善和革新;(2)4项政策均受到内部和外部多种因素的影响,导致执行率较低,需要从综合角度进行完善。

关键词：土地复垦关键政策调查分析矿区

Tuning Charge Transport of Oligopeptide Junctions via Interfacial Amino Acids

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Chinese Journal of Chemistry 2023年第17期41卷 2113-2118页

作者： jiaxin guo Pan Qi Yongkang Zhang Cunlan guo College of Chemistry and Molecular Sciences Wuhan UniversityWuhanHubei 430072China

Comprehensive Summary,The charge transport through peptides can imitate the corresponding processes in more complicated proteins,enabling us to develop high-performance bioelectronic devices and to understand the mechanisms of biomolecular recognition and information *** charge transport modulation through individual peptides has been achieved via various covalent strategies,the intermolecular modulation is still very challenging,which may capture the charge transport between *** tackle this challenge,we used well-defined self-assembled monolayers(SAMs)of oligopeptides as a model to imitate the interface of proteins and explored an interfacial amino acid strategy for charge transport *** showed that non-covalently interfaced charged amino acids(e.g.,arginine)effectively attenuated the charge transport of glutamic acid terminated polyglycine peptide *** analyzing the relationship of the charge transport with the molecular frontier orbital relative to the Fermi energy level of the electrode,the molecule-electrodes coupling(Γ),and the trends in skewness and kurtosis with voltage and the dielectric constant(εr),we showed that the attenuation was from the decreasedΓand the reduced *** present an efficient strategy to modulate the charge transport of oligopeptide-SAM junctions by intermolecular interactions,which will advance our understanding of charge transport in biological systems and facilitate developing future electronics.

关键词： Charge transport modulation Molecular electronics Molecular junctions Interfaces Weak intermolecular interactions

Surface Passivation of Perovskite Solar Cells Toward Improved Efficiency and Stability

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Nano-Micro Letters 2019年第3期11卷 240-248页

作者： Zhiqi Li Jiajun Dong Chunyu Liu jiaxin guo Liang Shen Wenbin guo State Key Laboratory on Integrated Optoelectronics College of Electronic Science and EngineeringJilinUniversity2699Qianjin StreetChangchun130012People’s Republic of China State Key Laboratory of Superhard Materials Jilin University2699 Qianjin StreetChangchun130012People’s Republic of China

The advancement of perovskite solar cells(PVSCs)technology toward commercialized promotion needs high efficiency and optimum *** introducing a small molecular material such as tetratetracontane(TTC,CH3(CH2)42CH3)at the fullerene(C60)/perovskite interface of planar p-i-n PVSCs,we significantly reduced the interfacial traps,thereby suppressing electron recombination and facilitating electron ***,an improved efficiency of 20.05% was achieved with a high fill factor of 79.4%,which is one of the best performances for small molecular-modified ***,the hydrophobic TTC successfully protects the perovskite film from water *** a result,we realized a better long-term stability that maintains 87% of the initial efficiency after continuous exposure for 200 h in air.

关键词： Perovskite solar cells Surface passivation Charge transport Surface defect

Technical factors affecting the performance of anion exchange membrane water electrolyzer

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International Journal of Minerals,Metallurgy and Materials 2023年第11期30卷 2259-2269页

作者： Xun Zhang Yakang Li Wei Zhao jiaxin guo Pengfei Yin Tao Ling Key Laboratory for Advanced Ceramics and Machining Technology of Ministry of Education Institute of New-EnergySchool of Materials Science and EngineeringTianjin UniversityTianjin 300072China School of Materials Science and Engineering Tianjin Chengjian UniversityTianjin 300384China

Anion exchange membrane(AEM)electrolysis is a promising membrane-based green hydrogen production ***,AEM electrolysis still remains in its infancy,and the performance of AEM electrolyzers is far behind that of well-developed alkaline and proton exchange membrane ***,breaking through the technical barriers of AEM electrolyzers is *** the basis of the analysis of the electrochemical performance tested in a single cell,electrochemical impedance spectroscopy,and the number of active sites,we evaluated the main technical factors that affect AEM *** factors included catalyst layer manufacturing(e.g.,catalyst,carbon black,and anionic ionomer)loadings,membrane electrode assembly,and testing conditions(e.g.,the KOH concentration in the electrolyte,electrolyte feeding mode,and operating temperature).The underlying mechanisms of the effects of these factors on AEM electrolyzer performance were also *** irreversible voltage loss in the AEM electrolyzer was concluded to be mainly associated with the kinetics of the electrode reaction and the transport of electrons,ions,and gas-phase products involved in *** on the study results,the performance and stability of AEM electrolyzers were significantly improved.

关键词： hydrogen production anion exchange membrane water electrolyzer catalyst membrane electrode assembly

Nanoparticle–Cartilage Interaction: Pathology-Based Intra-articular Drug Delivery for Osteoarthritis Therapy

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Nano-Micro Letters 2021年第10期13卷 29-76页

作者： Xu Li Bingyang Dai jiaxin guo Lizhen Zheng Quanyi guo Jiang Peng Jiankun Xu Ling Qin Musculoskeletal Research Laboratory Department of Orthopedics and TraumatologyThe Chinese University of Hong KongSha TinHong KongSARPeople’s Republic of China Joint Laboratory of Chinese Academic of Science and Hong Kong for Biomaterials The Chinese University of Hong KongSha TinHong KongSARPeople’s Republic of China Beijing Key Lab of Regenerative Medicine in Orthopedics Key Laboratory of Musculoskeletal Trauma and War Injuries PLAInstitute of OrthopedicsChinese PLA General HospitalBeijingPeople’s Republic of China Innovative Orthopedic Biomaterial and Drug Translational Research Laboratory Li Ka Shing Institute of Health SciencesThe Chinese University of Hong KongSha TinHong KongSARPeople’s Republic of China

Osteoarthritis is the most prevalent chronic and debilitating joint disease,resulting in huge medical and socioeconomic ***-articular administration of agents is clinically used for pain ***,the effectiveness is inapparent caused by the rapid clearance of *** overcome this issue,nanoparticles as delivery systems hold considerable promise for local control of the pharmacokinetics of therapeutic *** the therapeutic programs are inseparable from pathological progress of osteoarthritis,an ideal delivery system should allow the release of therapeutic agents upon specific features of *** this review,we firstly introduce the pathological features of osteoarthritis and the design concept for accurate localization within cartilage for sustained drug ***,we review the interactions of nanoparticles with cartilage microenvironment and the rational ***,we highlight advances in the therapeutic schemes according to the pathology ***,armed with an updated understanding of the pathological mechanisms,we place an emphasis on the development of“smart”bioresponsive and multiple modality nanoparticles on the near horizon to interact with the pathological *** anticipate that the exploration of nanoparticles by balancing the efficacy,safety,and complexity will lay down a solid foundation tangible for clinical translation.

关键词： Nanoparticle Drug delivery Osteoarthritis Articular cartilage Nanomedicine

从“祛瘀生新”探讨恶性血液病化疗后骨髓抑制中医治疗

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中国中医药图书情报杂志 2024年第4期48卷 242-245页

作者：国佳鑫杨茜茹严冬董青北京急救中心北京100031 北京中医药大学东直门医院北京100700

“祛瘀生新”最早出自《神农本草经》,作为治疗法源于《黄帝内经》。血瘀是化疗后骨髓抑制的重要病理因素,且贯穿疾病全程。化疗后骨髓抑制的病机为正虚致瘀,新血不生,气滞血瘀,血运失畅;久病体虚,瘀毒并存。以祛瘀为治疗恶性血液病化... 详细信息

“祛瘀生新”最早出自《神农本草经》,作为治疗法源于《黄帝内经》。血瘀是化疗后骨髓抑制的重要病理因素,且贯穿疾病全程。化疗后骨髓抑制的病机为正虚致瘀,新血不生,气滞血瘀,血运失畅;久病体虚,瘀毒并存。以祛瘀为治疗恶性血液病化疗后骨髓抑制的关键方法,使瘀祛气血平、新血生。本文从理论及临床方面探讨祛瘀生新法治疗恶性血液病化疗后骨髓抑制的作用,以展现中医治疗本病的特色和优势。

关键词：化疗后骨髓抑制血瘀祛瘀生新中医治疗

青藏高原“一江两河”农区居民家庭食物消费生态足迹核算

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生态学报 2024年第17期44卷 7476-7489页

作者：王灵恩李云云李佳洳郭嘉欣张宪洲范玉枝成升魁中国科学院地理科学与资源研究所北京100101 中国农业大学经济管理学院北京100083 南开大学旅游与服务学院天津300350

核算区域食物消费及其资源环境代价对优化区域食物供应、加强区域生态保护与调整食物安全战略具有重要意义。基于实地调研获取的2018年青藏高原“一江两河”农区居民家庭食物消费一手数据,在分析居民食物消费数量与结构的基础上核算其... 详细信息

核算区域食物消费及其资源环境代价对优化区域食物供应、加强区域生态保护与调整食物安全战略具有重要意义。基于实地调研获取的2018年青藏高原“一江两河”农区居民家庭食物消费一手数据,在分析居民食物消费数量与结构的基础上核算其生态足迹。主要结论如下:(1)“一江两河”农区居民家庭人均食物消费量为482.44 kg人^(-1)a^(-1),全年区域食物消费总量达36.90万t,其中植物性食物消费占比74.4%,约是动物性食物(25.6%)的2.91倍;消费结构中,蔬菜占比最高(29.4%),其次是青稞(20.7%)和奶类(15.3%),肉类消费以牛羊肉为主(88.4%);(2)区域食物消费所占用的生态足迹总量高达41.41万hm^(2),是“一江两河”所在三市(拉萨、日喀则和山南)耕地面积的2.48倍,肉类消费所占用的生态足迹最大(51.1%);食物消费的生态足迹有30.8%来自外地,其中以甘肃、青海、新疆三地居多。

关键词：食物消费生态足迹农区家庭定量核算青藏高原

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基于深度学习的机械故障诊断方法研究

信息与电脑 2024年第2期36卷 139-141页

作者：郭家鑫苏孟豪左昊文郑州工业应用技术学院河南郑州1451100 中原工学院河南郑州450007

文章研究了一种基于深度学习的机械故障诊断方法,通过分析机械部件产生的振动信号诊断故障。系统设计包括机械部件、振动信号采集以及深度学习振动信号分析模型。在算法方面,该模型采用融合长短期记忆(Long Short-Term Memory,LSTM)和... 详细信息

文章研究了一种基于深度学习的机械故障诊断方法,通过分析机械部件产生的振动信号诊断故障。系统设计包括机械部件、振动信号采集以及深度学习振动信号分析模型。在算法方面,该模型采用融合长短期记忆(Long Short-Term Memory,LSTM)和卷积神经网络(Convolutional Neural Network,CNN)的结构,有效地捕捉振动信号的时序和空间信息。在凯斯西储大学(Case Western Reserve University,CWRU)滚动轴承数据集上进行实验验证,结果表明该方法在多类别故障诊断任务中表现优秀,具有高准确性和可靠性。

关键词：深度学习机械故障长短期记忆(LSTM)模型卷积神经网络(CNN)