检索结果-南通市图书馆

Numerical investigation of the photo-thermal characteristics of a direct absorption solar collector using Monte Carlo and finite volume methods

在线全文

学校读者我要写书评

暂无评论

Science China Technological Sciences 2024年第8期67卷 2436-2448页

作者： ZHU YanLong LI SuNing fan jianhua KONG WeiQiang YUAN Yuan TAN HePing School of Energy Science and Engineering Harbin Institute of Technology Department of Civil Engineering and Mechanical Engineering Technical University of Denmark School of Vehicle and Energy Yanshan University

In this study, a novel model of photothermal conversion in a direct absorption solar collector based on the Monte Carlo and finite volume methods was built and validated and the temperatures of the novel and traditional solar collectors were compared. The sensitivity of the parameters to the radiative heat loss was investigated. Finally, the radiative heat transfer characteristics were discussed using the radiative exchange factor. The results of this study validated the advantages of the novel solar collector at both the surface and fluid temperatures. Under the conditions used in this study, the maximum temperature difference of the novel solar collector was 30 K, compared with 193 K for the traditional solar collector. Furthermore, the collector was divided into several units along the flow direction. The radiative exchange factor indicated that with an increase in the attenuation coefficient, the percentage of radiation intensity in the total solar radiation absorbed by the corresponding unit ***, it decreased with an increase in the incident angle and scattering albedo. These results provide a reference for addressing the low efficiency and thermal damage caused by traditional solar collectors at high temperatures.

关键词： direct absorption solar collector radiative heat transfer Monte Carlo

Photo-controllable antifouling hydrogels embedded with AgNPs coated spiropyran functionalized mesoporous silica for long-term antibacterial activity

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2024年第9期17卷 8337-8349页

作者： Wei Su Fei Wang Bing Chen Ruoke Li Jindian Liu Junjie Xu jianhua fan Yueling Liu State Key Laboratory of Bioreactor Engineering East China University of Science and TechnologyShanghai 200237China Department of Applied Biology School of BiotechnologyEast China University of Science and TechnologyShanghai 200237China

Silver nanoparticles(AgNPs)are widely used in antimicrobial ***,its easy aggregation and rapid loss hinder the effective *** address this issue,a novel stimuli-responsive antibacterial nanocomposite(Ag@SP-MSN)was developed based on spiropyran covalently conjugated mesoporous silica nanoparticles(284.6 nm)and AgNPs(27.1 nm)via strong electrostatic *** transmission electron microscopy(TEM)and atomic force microscopy(AFM)images proved the successful modification of AgNPs onto *** light-induced maximum loading amount towards AgNPs was calculated to be 95.0 wt.%after ultraviolet irradiation,while the amount of AgNPs released from Ag@SP-MSN was 94.4 wt.%under visible light in the aid of ammonia(0.1%,v/v).Upon cycled light irradiation,Ag@SP-MSN could recover 84.5 wt.%of AgNPs even after four *** proposed Ag@SP-MSN exhibited better antibacterial activity against both *** and *** than Ag@MSN under visible light illumination,indicating the efficient photo-responsive isomerization of ***,the Ag@SP-MSN embedded gel demonstrated outstanding antifouling ability even after 21 days when compared to AgNPs *** long-term photo-controllable antifouling property proved the excellent reversible absorption and release of Ag@SP-MSN towards *** work provides new insights into the safe utilization of nanomaterials,offering promising advancements to meet clinical antibacterial requirements.

关键词： light-responsive silver nanoparticles spiropyran mesoporous silica nanoparticles antibacterial activity

习近平文化思想指引文化产业高质量发展的理论诠释和实践路径

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

云南师范大学学报（哲学社会科学版） 2024年第4期56卷 80-90页

作者：范建华李林江华中师范大学国家文化产业研究中心湖北武汉430079

以习近平同志为核心的党中央将社会主义文化建设纳入“五位一体”总体布局,系统谋划和部署新时代社会主义文化建设和文化产业发展,形成了思想内涵丰富、理论体系严整、明体达用体用贯通的习近平文化思想。习近平文化思想继承和发展马克... 详细信息

以习近平同志为核心的党中央将社会主义文化建设纳入“五位一体”总体布局,系统谋划和部署新时代社会主义文化建设和文化产业发展,形成了思想内涵丰富、理论体系严整、明体达用体用贯通的习近平文化思想。习近平文化思想继承和发展马克思主义文化观,深刻认识和把握社会主义文化产业一般发展规律,以人民为中心,继承发展优秀传统文化,指引文化产业担负起新的文化使命,满足人民日益增长的文化需求,与社会主义文化事业协调发展,逐步成为国民经济战略性和支柱性产业,实现高质量发展。

关键词：习近平文化思想文化产业高质量发展理论诠释实践路径

特色文化产业赋能中国式乡村现代化——基于鹤庆县的考察

在线全文

学校读者我要写书评

暂无评论

云南民族大学学报（哲学社会科学版） 2024年第3期41卷 70-77页

作者：范建华黄小刚华中师范大学国家文化产业研究中心湖北武汉430079 贵州民族大学乡村振兴研究中心贵州贵阳550025

中国式现代化是中国共产党领导的、有别于西方的社会主义现代化。特色文化产业是实现乡村全面振兴的有力支撑,是实现“第二个结合”的重要突破口,也是实现中华优秀传统文化“两创”的关键抓手,对建设中国式乡村现代化具有显著的赋能作... 详细信息

中国式现代化是中国共产党领导的、有别于西方的社会主义现代化。特色文化产业是实现乡村全面振兴的有力支撑,是实现“第二个结合”的重要突破口,也是实现中华优秀传统文化“两创”的关键抓手,对建设中国式乡村现代化具有显著的赋能作用。鹤庆县持续推进“一村一业”发展模式,形成了以新华村为引领,覆盖县域整体的特色文化产业发展格局。通过铸牢中华民族共同体意识凝聚中国式现代化建设强大合力、激发和坚持特色文化产业发展的村民主体性地位、以“一村一业”特色文化产业集群推进中华优秀传统文化“两创”等途径,探索出了一条以特色文化产业助力乡村全面振兴、实现中国式乡村现代化的可行之路。

关键词：特色文化产业中国式现代化乡村现代化乡村振兴鹤庆县

同方期刊数据库

脑缺血/再灌注后大鼠心肌自噬的变化及分子调节机制

在线全文

学校读者我要写书评

暂无评论

中国医科大学学报 2024年第7期53卷 603-609页

作者：李晓婷聂宏光樊建华中国医科大学附属第四医院院内感染管理办公室沈阳110032 中国医科大学基础医学院干细胞与再生医学研究室沈阳110122 中国医科大学附属第四医院神经内科沈阳110032

目的探讨脑缺血/再灌注(CI/R)不同时间心肌损伤及机体自我保护机制自噬的的动态变化及分子机制。方法采用雄性Sprague-Dawley大鼠建立CI/R模型。按照再灌注时间将大脑中动脉闭塞后CI/R大鼠分为6、12、24和48 h组。采用活性氧(ROS)、... 详细信息

目的探讨脑缺血/再灌注(CI/R)不同时间心肌损伤及机体自我保护机制自噬的的动态变化及分子机制。方法采用雄性Sprague-Dawley大鼠建立CI/R模型。按照再灌注时间将大脑中动脉闭塞后CI/R大鼠分为6、12、24和48 h组。采用活性氧(ROS)、活性氮(RNS)检测指标评估心肌氧化应激损伤。观察各组大鼠心肌细胞凋亡和自噬体结构,检测心肌自噬、自噬流以及自噬调控蛋白和基因表达的动态变化。结果大鼠CI/R后心肌发生氧化应激损伤及凋亡,心肌细胞内自噬体增加,在12 h达高峰,自噬流在CI/R前12 h内被破坏,心肌内自噬调节蛋白Beclin 1、mTOR、AMPK在CI/R后48 h表达增加,其表达趋势与自噬变化基本一致,与对照组比较差异均有统计学意义。结论自噬在大鼠CI/R所致心肌损伤中起保护作用,Beclin 1介导的自噬/凋亡互反馈通路及mTOR介导的mTOR/自噬互反馈通路在调节自噬中起重要作用。

关键词：缺血/再灌注损伤自噬 Beclin 1 mTOR

同方期刊数据库

在线全文

学校读者我要写书评

暂无评论

面向多任务联邦学习的移动设备调度方法

指挥与控制学报 2024年第1期10卷 88-99页

作者：焦翔魏祥麟范建华薛羽贾茹娜南京信息工程大学计算机与软件学院南京210044 国防科技大学第六十三研究所南京210007

边缘指挥控制场景下,将多任务联邦学习中的移动设备调度问题建模为多目标优化问题,在模型收敛性、传输可靠性、计算资源有限性约束下,最小化联邦学习任务每轮的训练时延和能耗。为了求解该0-1整数规划问题,提出了一种基于差分进化的移... 详细信息

边缘指挥控制场景下,将多任务联邦学习中的移动设备调度问题建模为多目标优化问题,在模型收敛性、传输可靠性、计算资源有限性约束下,最小化联邦学习任务每轮的训练时延和能耗。为了求解该0-1整数规划问题,提出了一种基于差分进化的移动设备调度算法,将调度方案作为个体,通过交叉变异迭代进化得到具有最佳适应度的次优解。仿真结果表明,所提算法能够在保证模型准确率的前提下,有效降低训练过程中的时延与能量消耗。

关键词：多任务联邦学习移动边缘计算时延能量消耗

在线全文

学校读者我要写书评

暂无评论

自编码器端到端通信系统后门攻击方法

计算机科学 2024年第7期51卷 413-421页

作者：甘润魏祥麟王超王斌王敏范建华南京信息工程大学电子与信息工程学院南京210044 国防科技大学第六十三研究所南京210007 南京信息工程大学计算机与软件学院南京210044

自编码器端到端通信系统无需显式地设计通信协议,比传统模块式通信系统复杂性更低,且灵活性和鲁棒性更高。然而,自编码器模型的弱可解释性也给端到端通信系统带来了新的安全隐患。实验表明,在信道未知且解码器单独训练的场景下,通过在... 详细信息

自编码器端到端通信系统无需显式地设计通信协议,比传统模块式通信系统复杂性更低,且灵活性和鲁棒性更高。然而,自编码器模型的弱可解释性也给端到端通信系统带来了新的安全隐患。实验表明,在信道未知且解码器单独训练的场景下,通过在信道层添加精心设计的触发器就可以让原本表现良好的解码器产生误判,并且不影响解码器处理不含触发器样本时的性能,从而实现针对通信系统的后门攻击。文中设计了一种触发器生成模型,并提出了将触发器生成模型与自编码器模型进行联合训练的后门攻击方法,实现动态的触发器的自动生成,在增加攻击隐蔽性的同时提升了攻击成功率。为了验证所提方法的有效性,分别实现了4种不同的自编码器模型,考察了不同信噪比、不同投毒率、不同触发器尺寸以及不同触发信号比场景下的后门攻击效果。实验结果表明,在6dB信噪比下,针对4种不同的自编码器模型,所提方法的攻击成功率与干净样本识别率均超过92%。

关键词：深度学习后门攻击端到端通信触发器自编码器

Request pattern change-based cache pollution attack detection and defense in edge computing

在线全文

学校读者我要写书评

暂无评论

Digital Communications and Networks 2023年第5期9卷 1212-1220页

作者： Junwei Wang Xianglin Wei jianhua fan Qiang Duan Jianwei Liu Yangang Wang The 63rd Research Institute National University of Defense TechnologyNanjing210007China

Through caching popular contents at the network edge,wireless edge caching can greatly reduce both the content request latency at mobile devices and the traffic burden at the core ***,popularity-based caching strategies are vulnerable to Cache Pollution Attacks(CPAs)due to the weak security protection at both edge nodes and mobile *** CPAs,through initiating a large number of requests for unpopular contents,malicious users can pollute the edge caching space and degrade the caching *** paper firstly integrates the dynamic nature of content request and mobile devices into the edge caching framework,and introduces an eavesdroppingbased CPA ***,an edge caching mechanism,which contains a Request Pattern Change-based Cache Pollution Detection(RPC2PD)algorithm and an Attack-aware Cache Defense(ACD)algorithm,is proposed to defend against *** results show that the proposed mechanism could effectively suppress the effects of CPAs on the caching performance and improve the cache hit ratio.

关键词： Mobile edge computing Cache pollution attack Flash crowd

A Current Perspective on the Renewable Energy Hydrogen Production Process

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

Journal of Thermal Science 2023年第2期32卷 542-596页

作者： ZHOU Jinzhi JI Wenhui CAO Xiaoling HE Wei fan jianhua YUAN Yanping School of Mechanical Engineering Southwest Jiaotong UniversityChengdu 610031China Department of Building Environment and Equipment Hefei University of TechnologyHefei 230009China Department of Civil Engineering Technical University of DenmarkBrovej 118Kgs.Lyngby DK 2800Denmark

Hydrogen is a type of clean energy which has the potential to replace the fossil energy for transportation,domestic and industrial *** expand the hydrogen production method and reduce the consumption of fossil energy,technologies of using renewable energy to generate hydrogen have been developed *** to the advantages of widespread distribution and various hydrogen production methods,most of the research or review works focus on the solar and biomass energy hydrogen production *** achieve a comprehensive acknowledge on the development state of current renewable energy hydrogen production technology,a review on hydrogen production systems driven by solar,wind,biomass,geothermal,ocean and hydropower energy has been *** reaction process,energy efficiency,exergy efficiency,hydrogen production rate,economic and environmental performance of these systems have been *** on the analysis of these different systems,the challenge and prospects of them are also analyzed.

关键词： hydrogen production renewable energy yield rate energy performance economic and environmental performance