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Simulation of gas-solid flow characteristics of the circulating fluidized bed boiler under pure-oxygen combustion conditions

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Chinese Journal of Chemical Engineering 2024年第6期70卷 9-19页

作者： Kaixuan Gao Xiwei Ke Bingjun Du Zhenchuan Wang Yan Jin Zhong Huang yanhong li Xuemin liu Key Laboratory of Special Equipment Safety and Energy-Saving for State Market Regulation China Special Equipment Inspection&Research InstituteBeijing 100029China Department of Energy and Power Engineering Tsinghua UniversityBeijing 100084China School of Electrical and Power Engineering Taiyuan University of TechnologyTaiyuan 030024China

Under the pressure of carbon neutrality,many carbon capture,utilization and storage technologies have witnessed rapid development in the recent years,including oxy-fuel combustion(OFC)***,the conventional OFC technology usually depends on the flue gas recirculation system,which faces significant investment,high energy consumption,and potential low-temperature corrosion *** these deficiencies,the direct utilization of pure oxygen to achieve particle fluidization and fuel combustion may reduce the overall energy consumption and CO_(2)-capture *** this paper,the fundamental structure of a self-designed 130 t·h^(-1) pure-oxygen combustion circulating fluidized bed(CFB)boiler was provided,and the computational particle fluid dynamics method was used to analyze the gas-solid flow characteristics of this new-concept boiler under different working *** results indicate that through the careful selection of design or operational parameters,such as average bed-material size and fluidization velocity,the pure-oxygen combustion CFB system can maintain the ideal fluidization state,namely significant internal and external particle ***,the contraction section of the boiler leads to the particle backflow in the lower furnace,resulting in the particle suspension concentration near the wall region being higher than that in the center ***,the upper furnace still retains the classic core-annulus flow *** addition to increasing solid circulation rate by reducing the average bed-material size,altering primary gas ratio and bed inventory can also exert varying degrees of influence on the gas-solid flow characteristics of the pure-oxygen combustion CFB boiler.

关键词： Circulating fluidized bed Pure-oxygen combustion Gas-solid flow characteristics Simulation CO_(2)capture

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Apolipoprotein E4 interferes with lipid metabolism to exacerbate depression-like behaviors in 5xFAD mice

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Animal Models and Experimental Medicine 2024年第3期7卷 347-361页

作者： Yanju Gong Mingfeng li Min liu Xinghan Wu yanhong li Chuan Qin ling Zhang iNHC Key Laboratory of Human Disease Comparative Medicine Beijing Engineering Research Center for Experimental Animal Models of Human Critical DiseasesInternational Center for Technology and lnnovation of Animal ModelComparative Medicine CenterInstitute of Laboratory Animal SciencesChinese Academy of Medical Sciences(CAMS)and Peking Union Medical College(PuMC)BeijingChina Changping National Laboratory(CPNL) BeijingChina

Background:Apolipoprotein E4(ApoE4)allele is the strongest genetic risk factor for late-onset Alzheimer's disease,and it can aggravate depressive symptoms in non-AD ***,the impact of ApoE4 on AD-associated depression-l ike behaviors and its underlying pathogenic mechanisms remain ***:This study developed a 5xFAD mouse model overexpressing human ApoE4(E4FAD).Behavioral assessments and synaptic function tests were conducted to explore the effects of ApoE4 on cognition and depression in 5xFAD *** in peripheral and central lipid metabolism,as well as the levels of serotonin(5-HT)andγ-aminobutyric acid(GABA)neurotransmitters in the prefrontal cortex,were *** addition,the protein levels of 24-dehydrocholesterol reductase/glycogen synthase kinase-3 beta/mammalian target of rapamycin(DHCR24/GSK3β/m TOR)and postsynaptic density protein 95/calmodulin-dependent protein kinase II/brain-derived neurotrophic factor(PSD95/CaMK-II/BDNF)were measured to investigate the molecular mechanism underlying the effects of ApoE4 on AD ***:Compared with 5xFAD mice,E4FAD mice exhibited more severe depressionlike behaviors and cognitive *** mice also exhibited increased amyloid-beta deposition in the hippocampus,increased astrocyte numbers,and decreased expression of depression-related neurotransmitters 5-HT and GABA in the prefrontal ***,lipid metabolism disorders were observed in E4FAD,manifesting as elevated low-density lipoprotein cholesterol and reduced high-density lipoprotein cholesterol in peripheral blood,decreased cholesterol level in the prefrontal cortex,and reduced expression of key enzymes and proteins related to cholesterol synthesis and *** expression of proteins related to the DHCR24/GSK3β/m TOR and PSD95/CaMK-II/BDNF pathways was also ***:This study found that ApoE4 overexpression exacerbates depressionlike behaviors in 5xFAD mice and confirmed that ApoE4 reduces co

关键词： 5xFAD mice Alzheimer's disease ApoE4 allele depression like

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Interdecadal variation of drought patterns and associated influencing factors in the north-south transitional zone of China

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Journal of Geographical Sciences 2024年第7期34卷 1253-1279页

作者： DONG Qingdong ZHU lianqi DUAN Zheng WANG liyuan CHEN Chaonan li yanhong ZHU Wenbo GURUNG Sher Bahadur The College of Geography and Environmental Science Henan UniversityKaifengHenan475004China Department of Physical Geography and Ecosystem Science Lund UniversityLundS-22362Sweden Central Department of Geography Tribhuvan UniversityKathmandu44600Nepal

In the context of global warming,escalating water cycles have led to a surge in drought frequency and ***,multidecadal fluctuations in drought and their multifaceted influencing factors remain inadequately *** study examined the multidecadal changes in drought characteristics(frequency,duration,and severity)and their geographical focal points within China's north-south transitional zone,the Qinling-Daba Mountains(QDM),from 1960 to 2017 using the Standardized Precipitation Evapotranspiration Index(SPEI).In addition,a suite of eight scenarios,correlation analysis,and wavelet coherence were used to identify the meteorological and circulation factors that influenced drought *** results indicate the following:(1)From 1960 to 2017,the QDM experienced significant interdecadal variations in drought frequency,duration,and severity,the climate was relatively humid before the 1990s,but drought intensified ***,the 1990s marked the period of the longest drought duration and greatest severity,while the years spanning 2010 to 2017 experienced the highest frequency of drought events.(2)Spatially,the Qinling Mountains,particularly the western Qinling Mountain,exhibited higher drought frequency,duration,and severity than the Daba *** disparity can be attributed to higher rates of temperature increase and precipitation decrease in the western Qinling Mountain.(3)Interdecadal variations in droughts in the QDM were directly influenced by the synergistic effects of interdecadal fluctuations in air temperature and *** factors modulate temperature and precipitation through phase transitions,thereby affecting drought dynamics in the *** Atlantic Multidecadal Oscillation emerges as the primary circulation factors influencing temperature changes,with a mid-1990s shift to a positive phase favoring *** East Asian Summer Monsoon and El Ni?o-Southern Oscillation are the main circulation factors a

关键词： drought standardized precipitation evapotranspiration index multidecadal shift transitional zone Qinling-Daba Mountains

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A multi-kernel-shell indium selenide@carbon nanosphere enabling high-performance lithium-ion batteries

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Journal of Energy Chemistry 2024年第9期96卷 698-708页

作者： Sihao Wang Zhuoming Jia Ying Zhao yanhong li Xianglong Kong Yongde Yan Fei He Milin Zhang linzhi Wu Piaoping Yang Wenwu li Meilin liu Zhiliang liu College of Material Sciences1nd Chemical Engineering Harbin Engineering UniversityHarbin 150001HeilongjiangChina School of Materials Science&Engineering Georgia Institute of TechnologyAtlantaGA 30332USA School of Chemical Engineering Sungkyunkwan University 2066Seobu-roJangan-guSuwon 440-746Republic of Korea College of Aerospace1nd Civil Engineering Harbin Engineering UniversityHarbin 150001HeilongjiangChina

Indium selenide has garnered significant attention for high volumetric capacities,but is currently plagued by the sluggish charge transfer kinetics,severe volume effect,and rapid capacity degradation that hinder their practical ***,we design,synthesize,and characterize a multi-kernel-shell structure comprised of indium selenide encapsulated within carbon nanospheres(referred to as m-K-S In_(2)Se_(3)@C)through an integrated approach involving a hydrothermal method followed by a gaseous selenization ***,experimental measurements and density functional theory calculations confirm that the m-K-S In_(2)Se_(3)@C not only improve the adsorption capability for li-ions but also lower the energy barrier for li-ions *** from numerous contact points,shorter diffusion distances and an improved volume buffering effect,the m-K-S In_(2)Se_(3)@C achieves an 800 mA h g^(−1)capacity over 1000 loops at 1000 mA g^(−1),a 520 mA h g^(−1)capacity at 5000 mA g^(−1)and an energy density of 270 Wh kg^(−1)when coupled with liFePO4,surpassing most related anodes reported ***,the m-K-S structure with unique nano-micro structure offers a new approach to the design of advanced anodes for liBs.

关键词： Multi-kernel-shell structure In_(2)Se_(3) Anode li-ion batteries

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专业何以正当化:再论新闻权威概念

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新闻界 2024年第3期 28-37页

作者：李艳红中山大学新闻传播学院中山大学城市治理创新研究基地广东深圳518060

“新闻权威”概念为讨论数字时代新闻业“命运”提供了重要的文化视角,近年来成为数字新闻业研究的重要概念。但这一概念仍显模糊,本文希望在前期学者的基础上为进一步厘清这一概念做努力。将新闻权威视为一种专业/职业的文化权威,认为... 详细信息

“新闻权威”概念为讨论数字时代新闻业“命运”提供了重要的文化视角,近年来成为数字新闻业研究的重要概念。但这一概念仍显模糊,本文希望在前期学者的基础上为进一步厘清这一概念做努力。将新闻权威视为一种专业/职业的文化权威,认为理解新闻权威的核心在于理解新闻作为一个专业何以成立以及何以正当化的问题。放在职业社会学脉络中,通过梳理职业社会学领域的三个不同的流派:结构/文化学派、控制/生态学派和互动建构论视角,本文为分析数字时代新闻权威的境况、变迁和挑战提供了一个分析框架,并以此为依据做出初探性讨论,期待以此激发更多实证研究。

关键词：数字新闻介入性新闻受众新闻生态

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Infection with SARS-CoV-2 can cause pancreatic impairment

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Signal Transduction and Targeted Therapy 2024年第5期9卷 2143-2160页

作者： Wei Deng linlin Bao Zhiqi Song ling Zhang Pin Yu Yanfeng Xu Jue Wang Wenjie Zhao Xiuqin Zhang Yunlin Han yanhong li Jiangning liu Qi Lv Xujian liang Fengdi li Feifei Qi Ran Deng Siyuan Wang Yibai Xiong Ruiping Xiao Hongyang Wang Chuan Qin NHC Key Laboratory of Comparative Medicine Beijing Key Laboratory for Animal Models of Emerging and Remerging Infectious DiseasesInstitute of Laboratory Animal ScienceChinese Academy of Medical Sciences and Comparative Medicine CenterPeking Union Medical CollegeBeijing 100021China Institute of Molecular Medicine College of Future TechnologyPeking UniversityBeijing 100871China Beijing Key Laboratory of Cardiometabolic Molecular Medicine Peking UniversityBeijing 100871China State Key Laboratory of Biomembrane and Membrane Biotechnology Peking-Tsinghua Center for Life SciencesBeijing 100871China Chinese Academy of Engineering Eastern Hepatobiliary Surgery Hospital225 Changhai RoadYangpu DistrictShanghai 200438China International Co-operation Laboratory on Signal Transduction Eastern Hepatobiliary Surgery InstituteSecond Military Medical UniversityShanghai 200438PR China National Laboratory for Oncogenes and Related Genes Cancer Institute of Shanghai Jiao Tong UniversityShanghai 200441PR China Changping National laboratory(CPNL) Beijing 102206China State Key Laboratory of Respiratory Health and Multimorbidity National Health Commission of the People’s Republic of ChinaBeijingPR China

Evidence suggests associations between COVID-19 patients or vaccines and glycometabolic dysfunction and an even higher risk of the occurrence of ***,we retrospectively analyzed pancreatic lesions in autopsy tissues from 67 SARS-CoV-2 infected non-human primates(NHPs)models and 121 vaccinated and infected NHPs from 2020 to 2023 and COVID-19 ***-label immunofluorescence revealed direct infection of both exocrine and endocrine pancreatic cells by the virus in NHPs and *** and limited phenotypic and histopathological changes were observed in adult *** proteomics and metabolomics results indicated metabolic disorders,mainly enriched in insulin resistance pathways,in infected adult NHPs,along with elevated fasting C-peptide and C-peptide/glucose ratio ***,in elder COVID-19 NHPs,SARS-CoV-2 infection causes loss of beta(β)cells and lower expressed-insulin in situ characterized by islet amyloidosis and necrosis,activation ofα-SMA and aggravated fibrosis consisting of lower collagen in serum,an increase of pancreatic inflammation and stress markers,ICAM-1 and G3BP1,along with more severe glycometabolic *** contrast,vaccination maintained glucose homeostasis by activating insulin receptorαand insulin receptorβ.Overall,the cumulative risk of diabetes post-COVID-19 is closely tied to age,suggesting more attention should be paid to blood sugar management in elderly COVID-19 patients.

关键词： infected elevated homeostasis

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基于人工智能技术的机器人运动控制系统设计

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现代电子技术 2024年第10期47卷 117-122页

作者：李艳红武汉工程大学邮电与信息工程学院湖北武汉430070

设计一种基于人工智能技术的机器人运动控制系统,确保机器人更好地理解人类的意图,并提供更加人性化的服务。该系统通过运动数据采集与传输组件连接机器人的轴电机,采集机器人当前运动数据后,将其传输到控制器组件内,控制器组件依托X86... 详细信息

设计一种基于人工智能技术的机器人运动控制系统,确保机器人更好地理解人类的意图,并提供更加人性化的服务。该系统通过运动数据采集与传输组件连接机器人的轴电机,采集机器人当前运动数据后,将其传输到控制器组件内,控制器组件依托X86架构工控机,使用PIC总线将采集到的机器人当前运动数据发送到基于人工智能技术的机器人运动路径规划模块内。该模块运用人工智能技术中的A*算法获取机器人轨迹路径规划结果后,依据该路径规划结果,将人工智能技术中的神经网络和模糊B样条基函数相结合,建立模糊B样条基函数神经网络控制器。该控制器输出机器人运动控制指令,并发送给伺服驱动器组件,伺服驱动器负责驱动机器人轴电机,控制机器人运动。实验结果表明:所设计系统具备较强的机器人路径规划能力,可在复杂路径情况下实现机器人运动控制,且控制精度和控制阶跃响应能力均较强。

关键词：人工智能机器人运动控制系统模糊B样条基函数神经网络路径规划

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交通运输行业碳排放自然达峰特征与峰值预测研究

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交通运输系统工程与信息 2024年第2期24卷 34-44页

作者：杨东李艳红田春林交通运输部科学研究院综合运输研究中心北京100029

交通运输行业碳排放达峰是一项长期的自然演变过程。为研究中国交通运输行业碳达峰进程,本文首先采用国际类比法,选取国外典型国家,对比国家总体碳排放量、交通运输行业碳排放量以及换算周转量三者峰值出现的时间,分析交通运输行业碳排... 详细信息

交通运输行业碳排放达峰是一项长期的自然演变过程。为研究中国交通运输行业碳达峰进程,本文首先采用国际类比法,选取国外典型国家,对比国家总体碳排放量、交通运输行业碳排放量以及换算周转量三者峰值出现的时间,分析交通运输行业碳排放的自然达峰特征,结合交通需求预测,预判中国交通运输行业碳排放自然达峰时间。然后,引入单位换算周转量碳排放量、铁路公路货运比等核心影响因素,构建交通运输碳排放STIRPAT(Stochastic Impacts by Regression on Population, Affluence, and Technology)预测模型。最后,通过类比分析与模型预测,得到中国交通运输行业碳达峰时间及峰值排放量。国际类比结果表明:交通运输行业碳达峰与国家碳达峰之间没有明确的因果关系,但与换算周转量达峰紧密相关,交通运输行业碳排放达峰时换算周转量达峰或接近峰值;预测中国换算周转量在2048年左右达到26万亿吨公里的平台期,从国际类比的角度判断,中国交通运输行业实现碳排放自然达峰时间约在2040—2043年。STIRPAT模型显示:城镇化率、人均GDP、单位换算周转量碳排放量、铁路公路货运比每增加1%,中国交通运输行业碳排放量将分别增加1.201%、0.259%、0.454%、-0.389%。基于国际类比与STIRPAT模型组合预测判断,中国交通运输行业将在2038—2040年实现碳排放达峰,峰值排放量约为13亿t。

关键词：综合运输碳达峰国际类比 STIRPAT模型峰值预测

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基于5G技术的舰船电力调度自动化系统研究

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舰船科学技术 2024年第15期46卷 173-176页

作者：李艳红李自成武汉工程大学邮电与信息工程学院湖北武汉430070 武汉工程大学电气信息学院湖北武汉430205

考虑舰船电力系统线路复杂、设备多样,调度数据冗杂且规模巨大,在此情况下为实现舰船电力系统快速、有效自动化调度,设计基于5G技术的舰船电力调度自动化系统。系统使用由RTU远动终端设备采集电力系统的线路、设备运行信息后,由5G通信... 详细信息

考虑舰船电力系统线路复杂、设备多样,调度数据冗杂且规模巨大,在此情况下为实现舰船电力系统快速、有效自动化调度,设计基于5G技术的舰船电力调度自动化系统。系统使用由RTU远动终端设备采集电力系统的线路、设备运行信息后,由5G通信网关发送至调度器;调度器结合目前电力系统运行信息,使用基于线性求解器的电力系统自动化调度模型,构建以快速实现断电负载故障合理恢复为调度目标的目标函数,由线性求解器自动化求解满足目标函数条件的电力系统开关动作方案,以故障重构的方式实现舰船电力调度自动化管理。实验中该系统调度下,舰船电力系统失电负荷为0 kW,5G通信网络的整体效用值不受调度数据业务数据包数量的约束,高达0.9,能够稳定、高效地支持大规模调度数据的传输。

关键词： 5G技术舰船电力调度自动化资源分配机制线性求解器故障重构

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KDP晶体生长机理实验研究手段综述

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广东化工 2024年第9期51卷 90-92,115页

作者：李滟鸿山东大学晶体材料国家重点实验室晶体材料研究所山东济南250100

KDP晶体是典型的水溶液型人工晶体。它具有非线性光学性能优良、易于生长出大尺寸单晶的优点,被用来制作惯性约束核聚变(ICF)工程中的倍频器件。但大晶体在生长过程中容易出现开裂、包藏等缺陷,严重影响晶体的物理性能。为了生长出高质... 详细信息

KDP晶体是典型的水溶液型人工晶体。它具有非线性光学性能优良、易于生长出大尺寸单晶的优点,被用来制作惯性约束核聚变(ICF)工程中的倍频器件。但大晶体在生长过程中容易出现开裂、包藏等缺陷,严重影响晶体的物理性能。为了生长出高质量单晶,针对KDP晶体的生长机理研究与生长工艺改进工作一直在进行。在此背景下,本文总结了近半个世纪以来针对该晶体生长机理研究的主要实验手段,分别介绍了它们的工作原理及存在的优缺点,并对部分研究结果进行了整理,可为其他水溶液型晶体生长机理研究工作提供有用参考。

关键词： KDP晶体生长机理生长台阶生长丘研究方法

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