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Active precursor promoting nucleation/growth of MwW zeolite and controlling its morphology

Petroleum Science 2023年第3期20卷 1922-1933页

作者： shi-wei cao Peng Xiao Jjie Wang Yu Sun Yun-Shan Shang Ya-Fen Ge Qi Liu Yan-Jun Gong Guang Moo Zhi-Hong Li State Key Laboratory of Heavy OilProcessing Key Laboratory of Catalysis of CNPCChina University of Petroleum-BejingBejing 102249China Beijing Synchrotron Radiation Facility Institute of High Energy PhysicsChinese Academy of SciencesBejing 100039China Cangzhou Risun Chemical Co.Ltd. Hebei 061000China

MWW zeolites is an important catalyst in petrochemical ***,the efficient preparation of Mww zeolites still faces challenges,and the origin of influential factors for regulating its structure properties also remains ***,we designed a nanoscale amorphous silica-alumina species denoted as active precursor(APS),and adopt the APS in the HMI mixture to synthesize MCM-22 zeolite(APS-MWW)*** reveal the distinctive role of APS in promoting the crystallization of MWW zeolites,two crystal materials(ITQ-1 and MCM-22)and one mother liquor(ML)as seeds to synthesize three types of MWW ***,when adding APS in the synthetic mixture,the HMI amount was reduced to less than a quarter and crystallization time was reduced to 36 ***-MWW sample provides a smaller particle size(2-4μm)and thinner stacked layer thickness(5-20 nm).Synchrotron radiation Small Angle X-ray Scattering(SAXS)shows each seed has a different impact on the species'fractal structure and size distribution in the mixture,which is highly related to the nucleation and growth of MWW *** shows a large number of 6 membered ring(MR)structure units which play a sig-nificant role in boosting the rapid nucleation and growth of APS-MwW *** the synthesized MWW zeolites,the APS-MWW performs the highest ethylbenzene yield in the alkylation reaction of benzene-ethylene,which is attributed to its moderate flake thickness,appropriate texture properties and more external surface *** results will provide a new perspective for producing MwW-types zeolites by using the available and effective active precursor.

关键词： MWW zeolites Active precursor Small-angle X-ray scattering Benzene-ethylene alkylation reaction

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500kV整流型混合式高压直流断路器

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电力系统自动化 2018年第7期42卷 102-107页

作者：石巍曹冬明杨兵吕玮王文杰刘彬南京南瑞继保电气有限公司江苏省南京市211102

直流断路器作为柔性直流电网故障元件的快速隔离装置,是构建直流电网的关键设备,能够大力支撑大规模新能源的高效并网和消纳。文中提出一种整流型混合式高压直流断路器电路拓扑,采用桥式换向阀组和单向开断阀组构成分断支路,与常规拓扑... 详细信息

直流断路器作为柔性直流电网故障元件的快速隔离装置,是构建直流电网的关键设备,能够大力支撑大规模新能源的高效并网和消纳。文中提出一种整流型混合式高压直流断路器电路拓扑,采用桥式换向阀组和单向开断阀组构成分断支路,与常规拓扑相比,使用一半数量的绝缘栅双极型晶体管(IGBT)即可实现电流双向开断,经济性好和可靠性高。文中详细介绍了整流型混合式高压直流断路器的拓扑结构及其开断工作原理,并提出预分闸控制策略和软合闸控制策略,以缩短分闸时间和减小合闸操作冲击。研制了一台额定电压500kV,额定电流3kA,最大开断电流25kA,开断时间小于3ms整流型混合式高压直流断路器样机。

关键词：高压直流断路器桥式换向电路拓扑控制策略

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技术创新驱动与晚清出版业转型研究

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编辑之友 2017年第10期 92-97页

作者：施威曹成铭冯锦荣南京信息工程大学科技史研究院江苏南京210044 香港大学中文学院香港薄扶林道999077

技术创新是出版业转型最活跃的因素和内生动力。晚清出版技术创新驱动机制是一个由利益驱动、技术溢出、协同演化机制构成的系统,在革新工作流程、改变产业形态、重塑经营模式三个层次上规约着晚清出版业转型升级的方式和路径。随着西... 详细信息

技术创新是出版业转型最活跃的因素和内生动力。晚清出版技术创新驱动机制是一个由利益驱动、技术溢出、协同演化机制构成的系统,在革新工作流程、改变产业形态、重塑经营模式三个层次上规约着晚清出版业转型升级的方式和路径。随着西方近代印刷、造纸、编辑、发行等技术、理念和规范的引进与广泛应用,晚清出版业的物质基础、组织形式、运营模式、产业性质都发生了根本变革。

关键词：出版技术创新驱动出版业近代化转型

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20kV级厂用分裂变压器的设计改进

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变压器 2016年第10期53卷 9-12页

作者：齐士伟曹真义山东泰开变压器有限公司山东泰安271000

本文中作者列举20k V级分裂变压器可用的几种绕组排列结构,通过分析变压器阻抗参数、损耗计算、主材用量和工艺性,提出了合理的绕组排列结构。

关键词：分裂变压器绕组排列设计

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Gut microbiota-astrocyte axis: new insights into age-related cognitive decline

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Neural Regeneration Research 2025年第4期20卷 990-1008页

作者： Lan Zhang Jingge wei Xilei Liu Dai Li Xiaoqi Pang Fanglian Chen Hailong cao Ping Lei Haihe Laboratory of Cell Ecosystem Department of GeriatricsTianjin Medical University General HospitalTianjinChina Tianjin Geriatrics Institute Tianjin Medical University General HospitalTianjinChina Department of Gastroenterology and Hepatology Tianjin Medical University General HospitalNational Key Clinical SpecialtyTianjin Institute of Digestive DiseasesTianjin Key Laboratory of Digestive DiseasesTianjinChina Department of Urology Tianjin Medical University General HospitalTianjinChina Tianjin Neurological Institution Tianjin Medical University General HospitalTianjinChina

With the rapidly aging human population,age-related cognitive decline and dementia are becoming increasingly prevalent *** is considered the main risk factor for cognitive decline and acts through alterations in the composition of the gut microbiota,microbial metabolites,and the functions of *** microbiota–gut–brain axis has been the focus of multiple studies and is closely associated with cognitive *** article provides a comprehensive review of the specific changes that occur in the composition of the gut microbiota and microbial metabolites in older individuals and discusses how the aging of astrocytes and reactive astrocytosis are closely related to age-related cognitive decline and neurodegenerative *** article also summarizes the gut microbiota components that affect astrocyte function,mainly through the vagus nerve,immune responses,circadian rhythms,and microbial ***,this article summarizes the mechanism by which the gut microbiota–astrocyte axis plays a role in Alzheimer’s and Parkinson’s *** findings have revealed the critical role of the microbiota–astrocyte axis in age-related cognitive decline,aiding in a deeper understanding of potential gut microbiome-based adjuvant therapy strategies for this condition.

关键词： age aging Alzheimer’s disease astrocytes cognitive decline dementia gut microbiota gut–brain axis microbial metabolites neuroinflammation Parkinson’s disease

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Enhancement of motor functional recovery in thoracic spinal cord injury: voluntary wheel running versus forced treadmill exercise

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Neural Regeneration Research 2025年第3期20卷 836-844页

作者： Do-Hun Lee Dan cao Younghye Moon Chen Chen Nai-Kui Liu Xiao-Ming Xu wei Wu Spinal Cord and Brain Injury Research Group Stark Neurosciences Research InstituteIndiana University School of MedicineIndianapolisINUSA Department of Neurological Surgery Indiana University School of MedicineIndianapolisINUSA Department of Neuroscience Baylor College of MedicineHoustonTXUSA

Spinal cord injury necessitates effective rehabilitation strategies, with exercise therapies showing promise in promoting recovery. This study investigated the impact of rehabilitation exercise on functional recovery and morphological changes following thoracic contusive spinal cord injury. After a 7-day recovery period after spinal cord injury, mice were assigned to either a trained group(10 weeks of voluntary running wheel or forced treadmill exercise) or an untrained group. Bi-weekly assessments revealed that the exercise-trained group, particularly the voluntary wheel exercise subgroup, displayed significantly improved locomotor recovery, more plasticity of dopaminergic and serotonin modulation compared with the untrained group. Additionally, exercise interventions led to gait pattern restoration and enhanced transcranial magnetic motor-evoked potentials. Despite consistent injury areas across groups, exercise training promoted terminal innervation of descending axons. In summary, voluntary wheel exercise shows promise for enhancing outcomes after thoracic contusive spinal cord injury, emphasizing the role of exercise modality in promoting recovery and morphological changes in spinal cord injuries. Our findings will influence future strategies for rehabilitation exercises, restoring functional movement after spinal cord injury.

关键词： behavioral assessment motor function neural plasticity running wheel exercise spinal cord injury treadmill exercise voluntary exercise

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Cathodic behavior of molten CaCl_2-cao and CaCl_2-NaCl-cao

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International Journal of Minerals,Metallurgy and Materials 2010年第6期17卷 791-794页

作者： Shu-lan Wang wei Wang shi-chao Li Shan-hui cao Department of Chemistry Northeastem University Shenyang 110004 China

The cathodic behavior of molten CaCl2, CaCl2-cao and equimolar CaCl2-NaCl-cao was studied by cyclic voltammograms and constant potential polarization at temperatures of 1123 to 1173 K on molybdenum and titanium electrodes. The diffusion coefficient of Ca2＋（cao） in molten CaCl2-cao was calculated from the linear relationship between the square root of scan rate and the peak current density. The deposition potentials and the potential temperature coefficient of cao in molten CaCl2-0.5mol%cao and CaCl2-NaCl-0.5mol%cao were also obtained from their cyclic voltammograms. The result shows that cao is more easily reduced than CaCl2. The addition of NaCl in molten CaCl2-cao induces the underpotential electrodeposition of cao.

关键词： molten salts calcium oxide cyclic voltammetry polarization

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分布式电源中最佳蓄电池容量的机会约束规划

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系统仿真学报 2005年第1期17卷 41-44页

作者：孙耀杰康龙云史维祥曹秉刚杨仲庆陕西省西安市西安交通大学机电系西安710049 日本Myway实验室

为解决分布式电源中最佳蓄电池容量的计算问题,提出了电池容量优化机会约束规划的数学模型。在分析决定电池容量的关键因素和分布式电源中风能、太阳能以及用户负载随机特性的概率模型基础上,将电池容量的最优化问题归结为机会约束规划... 详细信息

为解决分布式电源中最佳蓄电池容量的计算问题,提出了电池容量优化机会约束规划的数学模型。在分析决定电池容量的关键因素和分布式电源中风能、太阳能以及用户负载随机特性的概率模型基础上,将电池容量的最优化问题归结为机会约束规划问题,得到了优化计算的数学模型,并应用遗传算法,结合随机模拟技术求解,得到了最佳电池容量。实例计算表明该方法是有效的。

关键词：分布式电源电池容量,随机模拟随机约束规划遗传算法

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Optimizing the key parameter to accelerate the recovery of AMOC under a rapid increase of greenhouse gas forcing

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Atmospheric and Oceanic Science Letters 2025年第1期18卷 39-45页

作者： Haolan Ren Fei Zheng Tingwei cao Qiang Wang International Center for Climate and Environment Science(ICCES) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina University of Chinese Academy of Sciences BeijingChina College of Oceanography Hohai UniversityNanjingChina CAS Key Laboratory of Ocean Circulation and Waves Institute of OceanologyChinese Academy of Sciences and Pilot National Laboratory for Marine Science and Technology(Qingdao)QingdaoChina

Atlantic Meridional Overturning Circulation(AMOC)plays a central role in long-term climate variations through its heat and freshwater transports,which can collapse under a rapid increase of greenhouse gas forcing in climate *** studies have suggested that the deviation of model parameters is one of the major factors in inducing inaccurate AMOC *** this work,with a low-resolution earth system model,the authors try to explore whether a reasonable adjustment of the key model parameter can help to re-establish the AMOC after its *** a new optimization strategy,the extra freshwater flux(FWF)parameter is determined to be the dominant one affecting the AMOC’s *** traditional ensemble optimal interpolation(EnOI)data assimilation and new machine learning methods are adopted to optimize the FWF parameter in an abrupt 4×CO_(2) forcing experiment to improve the adaptability of model parameters and accelerate the recovery of *** results show that,under an abrupt 4×CO_(2) forcing in millennial simulations,the AMOC will first collapse and then re-establish by the default FWF parameter ***,during the parameter adjustment process,the saltier and colder sea water over the North Atlantic region are the dominant factors in usefully improving the adaptability of the FWF parameter and accelerating the recovery of AMOC,according to their physical relationship with FWF on the interdecadal timescale.

关键词： Recovery of AMOC 4×CO_(2)forcing Key parameter Parameter estimation Data assimilation Machine learning

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黑龙江玉米主产区不同基因型玉米氮素利用效率分析

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东北农业大学学报 2017年第2期48卷 1-7页

作者：魏湜曹鑫波李改玲左师宇焦健李晶顾万荣东北农业大学农学院哈尔滨150030

为选育氮高效品种,减少氮肥施用量,试验以黑龙江省24个不同基因型玉米品种为材料,采用盆栽方式,在N200 kg·hm^(-2)氮水平下研究抽雄期玉米品种干物质积累、总氮含量、氮素干物质生产效率、氮吸收速率、氮肥利用效率,分析各玉米品种干... 详细信息

为选育氮高效品种,减少氮肥施用量,试验以黑龙江省24个不同基因型玉米品种为材料,采用盆栽方式,在N200 kg·hm^(-2)氮水平下研究抽雄期玉米品种干物质积累、总氮含量、氮素干物质生产效率、氮吸收速率、氮肥利用效率,分析各玉米品种干物质积累及氮利用率特性,为黑龙江省氮高效玉米品种选育和栽培提供理论依据。根据聚类分析结果,将24个不同基因型品种分为低氮高效型(Ⅰ)、低氮中效型(Ⅱ)和低氮低效型(Ⅲ),分别占12.5%,37.5%和50.0%。Ⅰ型品种各项指标均显著高于其他品种。相关分析表明,氮素干物质生产效率与总干重、总氮含量、氮吸收速率呈极显著正相关,与氮肥利用效率呈显著正相关;通径分析表明,氮素干物质生产效率与总干重呈显著相关,总干重对氮素干物质生产效率贡献较大。

关键词：玉米干物质积累氮素积累氮素干物质生产效率

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