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Influence of the number of flights on the dilute phase ratio in flighted rotating drums by PTV measurements and DEM simulations

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Particuology 2021年第3期19卷 171-182页

作者： Lanyue Zhang zhaochen jiang Jochen Mellmann Fabian Weigler Fabian Herz Andreas Bück Evangelos Tsotsas Department of Postharvest Technology Leibniz Institute for Agricultural Engineering and BioeconomyMax-Eyth-Allee 100Potsdam 14469Germany Thermal Process Engineering Otto von Guericke University MagdeburgUniversitaetsplatz 239106 MagdeburgGermany Institute of Particle Technology(LFG) FAU Erlangen-NurembergCauerstr.491058 ErlangenGermany Department of Applied Biosciences and Process Engineering Anhalt University of Applied SciencesBernburgerStr.5506366 KoethenGermany

Particle distribution in the cross-section of the flighted rotating drum(FRD)is critical to the analysis of heat and mass transfer between gas and *** this work,the particle tracking velocimetry(PTV)method is applied to study the influence of the number of flights on the particle motion in *** drum,installed with 1,4,8,or 12 rectangular flights,is filled with plastic balls to 15%and operated at various rotating speeds ranging from 10 rpm to 30 *** results show that the number of flights has different effects on the holdup ratio and cascading rate of single flight and active *** 8 and 12 flights,the FRD produces a larger and more stable particle ratio of the dilute ***,DEM simulations agree with PTV measurements,whereas literature models show significant deviations.

关键词： Flighted rotating drum Number of flights Dilute phase PTV DEM

戊醇/生物柴油喷雾微观与宏观特性可视化研究

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工程热物理学报 2023年第11期44卷 3160-3171页

作者：王文俊钟汶君蒋兆晨颜飞斌郭恒何志霞王谦江苏大学能源与动力工程学院镇江212013 江苏大学能源研究院镇江212013

戊醇掺混生物柴油是非常具有潜力的可再生高活性替代燃料,但其掺混后喷雾雾化特性是制约其能否清洁燃烧关键因素。本研究在可视化定容燃烧弹中借助分光镜,将装配了长焦镜头和长工作距显微镜头的两台高速数码相机垂直布置,搭建了长焦高... 详细信息

戊醇掺混生物柴油是非常具有潜力的可再生高活性替代燃料,但其掺混后喷雾雾化特性是制约其能否清洁燃烧关键因素。本研究在可视化定容燃烧弹中借助分光镜,将装配了长焦镜头和长工作距显微镜头的两台高速数码相机垂直布置,搭建了长焦高速阴影成像和长工作距离显微高速阴影成像同步测量平台,同步实时捕捉多个喷射循环内宏观和微观喷雾图像,开展了戊醇/生物柴油喷雾宏观和微观特性的可视化试验。针对微观喷雾液滴直径和瞬时速度特征,开发了基于液滴分离和液滴追踪的颗粒追踪测速方法;针对宏观喷雾特性,基于最大类间方差法,获得喷雾贯穿距和喷雾锥角。本文定量表征了远场离散液滴回卷过程中直径(分布)和瞬时速度(分布),回卷平均速度约为轴向平均速度的1/20。

关键词：液滴直径液滴速度粒子追踪测速戊醇生物柴油

柴油机喷嘴结构对喷雾特性影响的耦合模拟研究

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机械工程学报 2014年第24期50卷 145-151页

作者：何志霞王芬刘菊燕蒋兆晨王谦江苏大学能源与动力工程学院镇江212013

高压共轨系统能有效地改善柴油机的喷雾质量,但随着燃油喷射压力的增加,燃油雾化过程变得更加复杂。而喷嘴内部湍流和空穴现象对喷雾雾化有重要的影响,特别是空穴现象。利用同步辐射X射线同轴相衬成像技术准确获得喷嘴几何结构尺寸,建... 详细信息

高压共轨系统能有效地改善柴油机的喷雾质量,但随着燃油喷射压力的增加,燃油雾化过程变得更加复杂。而喷嘴内部湍流和空穴现象对喷雾雾化有重要的影响,特别是空穴现象。利用同步辐射X射线同轴相衬成像技术准确获得喷嘴几何结构尺寸,建立精确的喷嘴内部流动模型,建立起耦合喷嘴内空穴流动的耦合喷雾模型,分析喷嘴内空穴流动对燃油喷射雾化的影响。利用在高压共轨喷雾试验台架上的高压喷雾试验,验证该喷雾模型的准确性。利用该验证后的喷雾模型直接得到喷嘴结构参数,包括喷孔长径比、喷孔入口圆角半径及喷嘴压力室结构对喷雾特性的影响,得出喷孔入口圆角半径和压力室结构对喷雾的索特平均直径有较大的影响。研究结果为柴油机燃油喷射系统的优化提供了理论依据。

关键词：柴油机喷嘴内空穴流动喷雾耦合模拟

New Biological Records of Paleoecological Changes Inferred from Pollen Since 2500 cal. a B.P. in the Ebinur Lake Area, North Xinjiang

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Acta Geologica Sinica(English Edition) 2021年第4期95卷 1413-1414页

作者： LI Yumei ZHAO Long jiang Hanchao ZHANG Yun KONG zhaochen State Key Laboratory of Earthquake Dynamics Institute of GeologyChina Earthquake AdministrationBeijing 100029China Development Research Center of China Earthquake Administration Beijing 100036China Beijing Institute of Geo-Environment Monitoring Beijing 100195China State Key Laboratory of Vegetation and Environmental Change Institute of BotanyChinese Academy of SciencesBeijing 100093China

Objective Betula microphylla Bunge, as a resource treasury of desert biodiversity, is a pioneer plant in saline-alkaline soil amelioration. According to previous research, Ebinur Lake, north Xinjiang, is a representat... 详细信息

关键词： Xinjiang salinity Paleo

基于“门槛-供需”耦合视角的县域农村生活可达性评价

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农业工程学报 2022年第11期38卷 279-288页

作者：杨兆晨刘耀林罗璇安睿姜永祯武汉大学资源与环境科学学院武汉430079

在乡村振兴背景下,农村生活设施布局优化对乡村发展、农村居民幸福感提升具有重要意义。针对农村可达性研究中评价对象与视角单一等问题,考虑四类生活设施,采用“面向服务需求的等时线分析方法”与改进的“两步移动搜索法”,从“门槛”... 详细信息

在乡村振兴背景下,农村生活设施布局优化对乡村发展、农村居民幸福感提升具有重要意义。针对农村可达性研究中评价对象与视角单一等问题,考虑四类生活设施,采用“面向服务需求的等时线分析方法”与改进的“两步移动搜索法”,从“门槛”与“供需”角度分析高安市农村生活可达性的空间分布特征,进而提出一种基于耦合视角的可达性分区模式,并探讨农村生活可达性的驱动机制与优化路径。结果表明:1)从最低时间成本来看,农村学前教育、大病就医、物流快递、文体活动均存在较大障碍,城乡发展的不均衡现象显著。2)从供需关系来看,教育资源与人口形成相对平衡的区域供需关系。部分乡镇中心医疗设施供给高于城区,商业与文体的供给普遍具有明显的城镇偏向性。3)基于“门槛-供需”耦合视角的农村可达性分区将高安市按四类设施分为高门槛-低供给、高门槛-高供给、低门槛-低供给、低门槛-高供给四种可达区和不可达区。农村生活可达性受空间阻抗与供需关系的影响,可从空间关系调整、生活设施与道路建设、生活服务服务要素流动三方面进行优化。研究可为县域农村生活设施、农村居民点的布局优化提供借鉴和参考。

关键词：生活设施可达性分区等时圈改进的两步移动搜索法(2SFCA) 蜂窝格网优化路径

Research on Command Information System Architecture for Human-Computer Fusion

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Research on Command Information System Architecture for Huma...

Vegetation and climate changes in the western Chinese Loess Plateau since the Last Glacial Maximum

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作者： zhaochen Zhang Wei jiang Xiaobin Mao The 28th Research Institute of CETC Collaborative Innovation Center of Novel Software Technology and Industrialization

In the intelligent war, building a "computer brain" that can understand, think and cooperate with human is one of the development directions of the future command information system. The design concept of command information system architecture for human-computer fusion is proposed, which is the transfer of human intelligence to computer intelligence. The system composition of the core elements such as the game confrontation deduction environment is designed innovatively. The operational mechanisms before and during the war are elaborated. The command information system architecture reference model of human-computer fusion is formed. Finally, the Department of Defense Architecture Framework（DoDAF） is used to verify the top-level guidance of architecture design to the construction of human-computer fusion system through the typical application case of future operation.

关键词： human-computer fusion command information system architecture game confrontation

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Vegetation and climate changes in the western Chinese Loess ...

分散液液萃取-HPLC测定中药化妆品中皂苷含量

中国科学院地质与地球物理研究所2015年度（第15届）学术年会

作者： Xiaoxiao Yang Wenying jiang Shiling Yang zhaochen Kong Yunli Luo Key Laboratory of Cenozoic Geology and Environment Institute of Geology and Geophysics Chinese Academy of Sciences University of Chinese Academy of Sciences State Key Laboratory of Vegetation and Environmental Change Institute of Botany Chinese Academy of Sciences

Pollen analysis was conducted for loess deposits from three sites in the western Chinese Loess Plateau,i.e. the loess area west of the Liupan Mountains. Results show that during the Last Glacial Maximum(LGM), in-situ vegetation was dominated by Artemisia and some droughtetolerant species such as Echinops-type, Chenopodiaceae, Nitraria, and Ephedra, while coniferous forest(mainly Picea) flourished in nearby river valleys. During the Holocene Optimum, Picea almost disappeared, and Echinops-type,Chenopodiaceae, Nitraria and Ephedra decreased;vegetation was characterized by Artemisia, Taraxacumtype, Polygonaceae and Leguminosae, implying the climate was warmer and wetter than during the *** the late Holocene, Chenopodiaceae, indicator of humanemanaged habitats, increased in the study area, indicating enhanced human *** climate was warmer and more humid in the loess areas east of the Liupan Mountains than in the west during both the LGM and Holocene Optimum. Likewise, a significant difference in specific plant types was observed between the east and west since the LGM. During the LGM, Pinus and some broadleaf trees emerged, but no Picea forest grew, while in the west, vegetation was characterized by desert shrub and desert steppe in situ, and by dark coniferous forests(mainly Picea) in nearby river valleys. During the Holocene Optimum, treeline advanced upward as a result of increased temperature. Picea thus withdrew from the western loess areas. Therefore, temperature is the major factor controlling the growth of Picea in the Chinese Loess Plateau.

关键词： Western Chinese Loess Plateau LGM Holocene Picea Vegetation Climate

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中国现代应用药学 2019年第11期36卷 1370-1374页

作者：卢兆晨李梦娇刘迪蒋晔吉林大学第一医院药学部长春130000 河北医科大学药学院石家庄050017

目的建立一种简便快速的分散液液萃取法(dispersive liquid-liquid extraction method,DLLE)用于除去中药化妆品中的基质类干扰成分,分离得到目标活性成分,并进行含量测定。方法取样品加甲醇溶解,过滤,调pH值至酸性。精密量取滤液1.0 mL... 详细信息

目的建立一种简便快速的分散液液萃取法(dispersive liquid-liquid extraction method,DLLE)用于除去中药化妆品中的基质类干扰成分,分离得到目标活性成分,并进行含量测定。方法取样品加甲醇溶解,过滤,调pH值至酸性。精密量取滤液1.0 mL,加入3 mL水饱和的氯仿和0.5 mL水,涡旋振荡2 min使成均一的乳浊液。离心(3 000 r·min^-1,5 min)分取上清液,即可完成中药化妆品中基质成分的去除以及目标活性成分的纯化。结果使用DLLE法对中药化妆品进行处理,分离得到活性成分,方法回收率为97.3%~98.0%,精密度和重复性良好。样品测定3个批号的中药护肤霜中人参皂苷Rg1含量测定值分别为0.236,0.210,0.222 mg·g^-1。结论本研究所建立的DLLE法操作简便,能快速有效地去除中药化妆品中的基质干扰,分离得到目标成分,方法回收率高;有机溶剂用量少,为中药化妆品分析测定提供了一个很好的分析手段。

关键词：分散液液萃取法(DLLE) 中药化妆品中药活性成分快速除杂

掺铥光纤激光器抽运的可调谐窄线宽Cr…ZnSe激光器

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中国激光 2017年第2期44卷 163-168页

作者：卜祥宝师红星程昭晨彭志刚刘江王璞北京工业大学激光工程研究院北京市激光应用技术工程技术研究中心北京100124

搭建了由国产1908nm掺铥光纤激光器抽运的中红外可调谐窄线宽Cr…ZnSe激光器。该激光器为X型腔结构,在抽运功率6.8 W时连续光最大输出功率为1.6 W,对应的斜效率为26.7%,中心波长为2420nm。采用Littrow结构实现了2284~2716nm的连续可调谐... 详细信息

搭建了由国产1908nm掺铥光纤激光器抽运的中红外可调谐窄线宽Cr…ZnSe激光器。该激光器为X型腔结构,在抽运功率6.8 W时连续光最大输出功率为1.6 W,对应的斜效率为26.7%,中心波长为2420nm。采用Littrow结构实现了2284~2716nm的连续可调谐,调谐范围为432nm,半峰全宽(FWHM)为0.13nm;抽运功率5 W时采用输出比22%的耦合输出镜在2350~2510nm范围内获得了大于500mW的输出。采用Littman结构实现了2305~2658nm的连续可调谐,调谐范围为353nm,FWHM小于0.05nm;抽运功率5 W时可在2350~2520nm范围内实现300mW以上激光功率输出。

关键词：激光器 cr:ZnSe 可调谐激光器光纤激光器中红外波段