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Particuology 2024年第8期91卷 176-189页

作者： Min An Jingqi Gao Tiankuo Wang xiangnan li National Supercomputing Center in Zhengzhou Zhengzhou UniversityZhengzhou450001China School of Chemical Engineering and New Energy Xiamen University MalaysiaSepangSelangor43900Malaysia School of Chemistry and Chemical Engineering Henan Normal UniversityXinxiang453007China

Particles can appear as catalyst,reactant or product in various gas-liquid-solid three-phase production *** bubble column reactors(SBCRs),as a kind of three-phase reactors,are preferred for phase contacting and ***,literature studies concerning the effects of particles on the hydrodynamics of SBCRs are manifold and inconsistent in ***,the multiscale interactions between particles,turbulent eddies and bubbles determine the reactor *** review focuses on revealing the particle effects in SBCRs from the perspective of multiscale *** hydrodynamic changes due to particle effects in literature are *** parameters,including the Stokes number,the solid-to-liquid density ratio,the ratio of particle and liquid characteristic lengths,the contact angle and the particle volume fraction are adopted to evaluate the characteristics of gas-liquid-solid *** relationships between particle influencing mechanisms and these parameters are analyzed and *** experimental results are explained by different ranges of these dimensionless ***,particle effects at the mesoscale and microscale,such as the influence on the bubble dynamics and the pivoting effect on the turbulence energy spectrum,are ***,progress in modeling the SBCRs with consideration of particles effects using the Euler method are *** review aims to improve the overall understanding of the complex hydrodynamics in the SBCRs.

关键词： Slurry bubble column reactors Particle effects Turbulence characteristics Bubble dynamics CFD

考虑分时电价和多车型的电动公交行车计划优化

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交通运输系统工程与信息 2024年第4期24卷 188-199,211页

作者：熊杰梁晶晶李向楠窦雪萍李同飞北京工业大学北京市交通工程重点实验室北京100124 民航机场规划设计研究总院有限公司北京100101

为最小化电动公交系统的总运营成本,本文提出一种考虑分时电价和多车型的电动公交行车与充电计划的一体化优化模型。该模型同时考虑车次链构建、充电时间窗及充电桩数量等实际运营约束。通过设计自适应大邻域搜索算法(Adaptive Large Ne... 详细信息

为最小化电动公交系统的总运营成本,本文提出一种考虑分时电价和多车型的电动公交行车与充电计划的一体化优化模型。该模型同时考虑车次链构建、充电时间窗及充电桩数量等实际运营约束。通过设计自适应大邻域搜索算法(Adaptive Large Neighborhood Search, ALNS)求解车次链,该算法针对多车型下的车次与车型匹配和车次链可行性等问题特性多元化设计可行解的破坏与修复算子。对于ALNS迭代中生成的可行车次链组合,构建分时电价下的充电计划优化子问题,并将其转化到特定的网络图中,设计基于最小费用流的算法求解充电时长,优化决策充电开始时间。选取北京市的3条公交线路验证模型和算法,结果显示,相比于现状,车队规模从30辆减少至24辆,电费成本和运营总成本分别降低了25.84%和20.63%。通过对比实验,探讨不同修复指标权重和车型组合对优化结果的影响。

关键词：城市交通行车计划自适应大邻域搜索算法电动公交分时电价多车型

从《自由魂》发现“革命新女性”--秋瑾“本来面目”探源

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衡阳师范学院学报 2024年第2期45卷 102-109页

作者：李向南湖州师范学院教师教育学院浙江湖州313000

在历史剧《自由魂》中,夏衍打破了“失事”与“求似”之间的均衡,造成秋瑾形象的“失真”。专业批评意见不断质疑秋瑾造像的真实性,挑战夏衍的“真实”标准。夏衍接受并践行了菊池宽的“实在性格”理论,通过鲜明的无产阶级观念、国族意... 详细信息

在历史剧《自由魂》中,夏衍打破了“失事”与“求似”之间的均衡,造成秋瑾形象的“失真”。专业批评意见不断质疑秋瑾造像的真实性,挑战夏衍的“真实”标准。夏衍接受并践行了菊池宽的“实在性格”理论,通过鲜明的无产阶级观念、国族意识与牺牲意志来凸显秋瑾的雄性气概,使秋瑾戴上了“革命新女性”的面具,同时也消泯了她作为女性的真实生命体验。夏衍从倍倍尔的《妇人与社会》一书获取了“新女性”的模板,将斯巴达女性与左联烈士冯铿作为秋瑾“本来面目”的现实参照,但经过“律法”的剪裁与重塑后,斯巴达女性、冯铿与秋瑾都丧失了“另一副面孔”。“失事”与“求似”之间的失衡,造成了历史人物叙事的内在困境。

关键词：秋瑾 “本来面目” “革命新女性” 斯巴达女性冯铿

水流作用下混凝土表面剪切力及其冲磨特性的试验研究

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混凝土 2024年第2期 6-10,19页

作者：张露玉左晓宝陈帅李向南南京理工大学理学院土木工程系江苏南京210094

为了获得水流作用下混凝土表面剪切力和抗冲磨强度的变化规律,以水泥砂浆替代混凝土,设计制备环形试件作为研究对象,将一部分试件浸入1 mol/L的氯化铵溶液浸泡,以得到表层具有不同溶蚀程度的环形试件,再利用自主设计的水流冲刷试验装置... 详细信息

为了获得水流作用下混凝土表面剪切力和抗冲磨强度的变化规律,以水泥砂浆替代混凝土,设计制备环形试件作为研究对象,将一部分试件浸入1 mol/L的氯化铵溶液浸泡,以得到表层具有不同溶蚀程度的环形试件,再利用自主设计的水流冲刷试验装置,开展试件在不同条件下的水流冲刷试验,分析水流流速、含砂率和溶蚀程度等参数对试件表面剪切力的影响以及试件抗冲磨强度的变化。结果表明:水泥砂浆试件表面剪切力随流速和含砂率的增大而增大,且与流速的1.70次方成正比;溶蚀后试件的表面剪切力比未溶蚀试件有明显增加,随着溶蚀程度的提高,试件表面剪切力也有一定增加;试件抗冲磨强度随着溶蚀程度和冲刷流速的增大而降低。

关键词：水流作用表面剪切力流速含砂率溶蚀程度抗冲磨强度

Hydrodynamic behavior of liquid-solid micro-fluidized beds determined from bed expansion

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Particuology 2018年第3期16卷 103-112页

作者： xiangnan li Mingyan liu Yanjun li Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) School of Chemical Engineering and Technology Tianjin University Tianjin 300072 China State Key Laboratory of Chemical Engineering (Tianjin University) Tianjin 300072 China

The bed-expansion characteristics of liquid-solid micro-fluidized beds were experimentally studied. Bed columns with inner diameters of 0.8, 1.45, and 2.3 mm were fabricated based on capillaries. Five parti- cle sizes in a range of 22-58 t^m were investigated. Bed-expansion curves were plotted using visually recorded bed-expansion heights. The bed expansion and initial fluidization behavior were compared with predictions for conventional-scale beds, Evident differences are reflected in lower expansion ratios and higher minimum fluidization velocities for micro-fluidized beds. These were attributed to the increase in the internal surface area of the particle beds and specific surface area of wall contact. The wall effect for micro-fluidized beds at higher particle/bed diameter ratios caused higher local voidage and an increase in expansion ratio. Correlations for the exponent and proportional coefficient in the Richardson-Zaki equation for micro-fluidized beds were proposed. The minimum fluidization velocities were correlated using a modification of the Ergun equation.

关键词： Micro-fluidized bed Wall effect Minimum fluidization velocity Richardson-Zaki equation Ergun equation

作物-内生微生物响应CO_(2)浓度升高与干旱胁迫的作用机制研究进展

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中国生态农业学报（中英文） 2024年第8期32卷 1331-1340页

作者：刘雨佳张鹏李书鑫刘磊姜淼李向楠刘海峰延边大学农学院延吉133002 中国科学院东北地理与农业生态研究所长春130102 吉林农业大学资源与环境学院长春130118 中国科学院大学北京100049

全球变暖、二氧化碳(CO_(2))浓度升高和局部地区干旱加剧等环境变化对作物生长发育及产量造成的影响日趋明显。内生微生物是一类与宿主植物形成互利共生机制的微生物,由于其长期生活在植物体的特殊环境中,对作物的生长发育和抗逆性具有... 详细信息

全球变暖、二氧化碳(CO_(2))浓度升高和局部地区干旱加剧等环境变化对作物生长发育及产量造成的影响日趋明显。内生微生物是一类与宿主植物形成互利共生机制的微生物,由于其长期生活在植物体的特殊环境中,对作物的生长发育和抗逆性具有重要作用,两者的共生关系会直接影响作物对环境变化的响应。本文主要综述作物-内生微生物共生系统及其在CO_(2)和干旱胁迫下对作物生理过程的调控,探讨了作物内生微生物群落的多样性以及促生效果、抑菌作用、抗逆能力,并重点关注了作物-内生微生物系统如何提高环境的耐受特性。具体而言,内生微生物可以通过提高宿主的气孔调节能力、增加根系吸收水分和养分的能力等方式,帮助作物适应CO_(2)浓度升高和干旱胁迫,从而减小环境变化对作物生长的负面影响,提高作物产量。此外,内生微生物还可以激活宿主的防御系统,提高其对病原体的抵抗能力,从而减轻病害对作物的影响。未来的研究应关注作物-内生微生物共生系统在不断升高的CO_(2)浓度和干旱复合胁迫下的响应机制,以提高作物对极端环境变化的抗性,为作物抗逆性育种提供新的思路和策略。

关键词： CO_(2)浓度升高干旱胁迫内生微生物群落多样性互作效应

中国通号FZL-300信号系统ATS分机设备原理及故障处理分析

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现代信息科技 2024年第6期8卷 48-51页

作者：卢美静李向南陕西城际铁路有限公司陕西西安710018

西安地铁14号线信号系统采用中国通号自研FZL-300型CBTC系统,其中ATS分机作为设备集中站的核心设备,负责控制中心与车站联锁系统之间的数据传输。掌握ATS分机工作原理,做好设备日常维护保养及故障处理,对地铁高效运营起着至关重要的作... 详细信息

西安地铁14号线信号系统采用中国通号自研FZL-300型CBTC系统,其中ATS分机作为设备集中站的核心设备,负责控制中心与车站联锁系统之间的数据传输。掌握ATS分机工作原理,做好设备日常维护保养及故障处理,对地铁高效运营起着至关重要的作用。文章主要从ATS车站分机工作原理、功能概述、故障处理以及日常维护等方面进行阐述,对同类型线路设备维护、故障处理等具有一定参考意义。

关键词： CBTC系统 ATS分机设备原理故障处理日常维护

Solid State Reaction Preparation of liFePO_4/(C+Cu) Cathode Material and Its Electrochemical Performance

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Journal of Materials Science & Technology 2013年第10期29卷 937-942页

作者： Yanhong Yin xiangnan li Xinxin Mao Xianliang Ding Shuting Yang School of Chemistry and Chemical Engineering Henan Normal University Engineering Technology Research Center of Motive Power and Key Materials of Henan Province

Cu-C co-coated liFePO4 （liFePO4/（C ＋ Cu）） cathode material was successfully prepared through solid state reduction reaction. The optimized additive amount of CuO was determined by electrochemical test of series content-dependent samples. Electrochemical performances of liFePO4/（C ＋ Cu） cathode material were investigated. Crystalline structure, morphology and electrochemical performance of the samples were characterized by X-ray diffraction, scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, energy dispersive spectroscopy （EDS）, charge-discharge tests and AC impedance techniques. Results showed that crystal structure of the bulk material was not destroyed after Cu particles distributed on the surface of liFePO4/C. With 5 wt% CuO additive, the liFePO4/（C ＋ Cu） cathode material showed improved electrochemical performance especially at high rates and low temperature. At 25 ℃ and 0.1 C current rate, specific capacity of the Cu-coated sample reaches 161.3 mA h/g. The result was 47 mA h/g higher than that of the un-coated one. At -20 ℃, the discharge capacity of Cu-coated materials was 113.4 mA h/g at 0.1 C rate and 83.8 mA h/g at 5 C rate, which reached about 70% of that at room temperature, respectively.

关键词： liFePO4/(C + Cu) Cu-coated Low temperature performance li-ion batteries Electrochemical performances Materials synthesis

In-situ observation and modeling approach to evolution of pore-fracture structure in coal

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International Journal of Mining Science and Technology 2023年第3期33卷 265-274页

作者： Hongwei Zhou Zelin liu Jiawei Zhao Bocen Chen xiangnan li Jiangcheng Zhong School of Energy and Mining Engineering China University of Mining and Technology-BeijingBeijing 100083China State Key Laboratory of Coal Resources and Safe Mining China University of Mining and Technology-BeijingBeijing 100083China School of Mechanics and Civil Engineering China University of Mining and Technology-BeijingBeijing 100083China

The characterisation of the pore-fracture structure(PFS)and its evolution in coal during mining are essential for preventing gas outbursts and improving gas extraction *** this study,the evolution of the PFS in coal samples under the condition of mining stress was directly captured in situ by combination of the mechanical testing system with high-precision visualisation nuclear magnetic resonance equipment.A fractional derivative model was established to describe the relationship between stress and porosity based on experimental results of the PFS under different stress *** results showed that with an increase in the deviatoric stress,the adsorption pore content increases rapidly initially and then increases slowly or remains unchanged;the seepage pore and fracture(SPF)content decreases initially and then *** SPF compressibility coefficient decreases with an increase in the deviatoric *** fractional derivative model can accurately describe the stress sensitivity of the SPFs at the pre-peak stage,thus providing a new approach for accurately characterising the seepage characteristics of coal reservoirs.

关键词： Pore-fracture structure Fractional derivative Stress sensitivity Compressibility Nuclear magnetic resonance imaging

Computer Aided Design Technology for Convex Faceted Gem Cuts Based on the Half-Edge Data Structure

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Journal of Beijing Institute of Technology 2019年第3期28卷 585-597页

作者： linhong Xu xiangnan li Jianhua Rao Yuan Han Zhipeng li Jichun li School of Mechanical Engineering and Electronic Information China University of Geosciences (Wuhan)

Aiming to increase the efficiency of gem design and manufacturing, a new method in computer-aided-design (CAD) of convex faceted gem cuts (CFGC) based on Half-edge data structure (HDS), including the algorithms for the implementation is presented in this work. By using object-oriented methods, geometrical elements of CFGC are classified and responding geometrical feature classes are established. Each class is implemented and embedded based on the gem process. Matrix arithmetic and analytical geometry are used to derive the affine transformation and the cutting algorithm. Based on the demand for a diversity of gem cuts, CAD functions both for free-style faceted cuts and parametric designs of typical cuts and visualization and human-computer interactions of the CAD system including two-dimensional and three-dimensional interactions have been realized which enhances the flexibility and universality of the CAD system. Furthermore, data in this CAD system can also be used directly by the gem CAM module, which will promote the gem CAD/CAM integration.

关键词： Half-edge data structure convex faceted gem cuts (CFGC) computer aided design (CAD)