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Devolatilization of high viscous fluids with high gravity technology

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Chinese Journal of Chemical Engineering 2024年第7期71卷 249-257页

作者： Jibing Qi Youzhi liu Yandong liu Taiyuan University Taiyuan 030032China Shanxi Province Key Laboratory of Higee-Oriented Chemical Engineering North University of ChinaTaiyuan 030051China

Volatile organic compounds(VOCs)are generally toxic and harmful substances that can cause health and environmental *** removal of VOCs from polymers has become a key *** effective devolatilization to remove VOCs from high viscous fluids such as polymer is necessary and is of great *** this study,the devolatilization effect of a rotating packed bed(RPB)was studied by using polydimethylsiloxane as the viscous fluid and acetone as the *** devolatilization rate and liquid phase volume(KLa)have been *** results indicated that the optimum conditions were the high-gravity factor of 60,liquid flow rate of 10 L·h^(-1),and vacuum degree of 0.077 *** dimensionless correlation of KLa was established,and the deviations between predicted and experimental values were less than±28%.The high-gravity technology will result in lower mass transfer resistance in the devolatilization process,enhance the mass transfer process of acetone,and improve the removal effect of *** work provides a promising path for the removal of volatiles from polymers in combination with high-gravity *** can provide the basis for the application of RPB in viscous fluids.

关键词： High-gravity technology Devolatilization rate High viscous fluid Volatile organic compounds(VOCs)

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不同形状砂岩的动态力学特性

中南大学学报（自然科学版） 2017年第9期48卷 2441-2448页

作者：谢晓锋陶明吴秋红王泽伟尚雪义刘恺中南大学资源与安全工程学院湖南长沙410083

为研究横截面形状对岩石试样动态力学特性的影响,采用改进后的霍普金森压杆(SHPB)对砂岩圆柱试样、方形试样和厚壁圆筒试样进行冲击试验。研究结果表明:这3种试样的动态强度均随应变率的增大而增大,由于厚壁圆筒试样存在较大自由面,故... 详细信息

为研究横截面形状对岩石试样动态力学特性的影响,采用改进后的霍普金森压杆(SHPB)对砂岩圆柱试样、方形试样和厚壁圆筒试样进行冲击试验。研究结果表明:这3种试样的动态强度均随应变率的增大而增大,由于厚壁圆筒试样存在较大自由面,故其比圆柱试样和方形试样对应变率变化更敏感;横截面形状对岩石变形模量的影响较小,而对峰值应变的影响较大,峰值应变的应变率效应不明显;横截面形状和应变率对试样破坏形式的影响较明显,方形试样棱角处均出现明显的剪切面,应变率越大,试样破碎块度越小。

关键词：岩石力学霍普金森压杆(SHPB) 动态性质形状效应应变率强度

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星载导航SoC产品保证方法探索与实践

质量与可靠性 2022年第5期 1-6页

作者：赵小莉刘学毅航天恒星科技有限公司北京100095

系统级芯片(System on Chip, SoC)是一款设计复杂度高、研制生产流程复杂的芯片。为了保证SoC芯片的设计质量,实现一次流片成功,针对宇航用SoC芯片数量少、成本高、可靠性高的产品特点和存在的问题及风险点,通过不断的研究和实践,形成... 详细信息

系统级芯片(System on Chip, SoC)是一款设计复杂度高、研制生产流程复杂的芯片。为了保证SoC芯片的设计质量,实现一次流片成功,针对宇航用SoC芯片数量少、成本高、可靠性高的产品特点和存在的问题及风险点,通过不断的研究和实践,形成了一套SoC芯片研制生产过程的精细化产品保证方法。重点介绍了产品保证技术要素和产品保证流程,通过产品保证技术要素落实风险点和关键点的管控措施,并结合前端设计、后端设计、封装筛选及考核试验阶段重点阐述了产品保证技术要素在产品保证流程中的实现,以及产品保证流程与技术流程的融合。通过过程质量确认,保障了宇航SoC芯片精细化产品保证工作的全面实施,从而大幅度提升了星载导航SoC芯片的产品合格率和产品质量。

关键词： SoC芯片技术流程产品保证要素前端设计后端设计质量确认

Polar solvent induced in-situ self-assembly and oxygen vacancies on Bi_(2)MoO_(6)for enhanced photocatalytic degradation of tetracycline

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Nano Research 2024年第6期17卷 4951-4960页

作者： Fangyan liu Dongyue Su Weizhen liu Baiquan liu Chuan liu Hong Wang Mengye Wang State Key Laboratory of Optoelectronic Materials and Technologies Guangdong Province Key Laboratory of Display Material and TechnologySchool of Electronics and Information TechnologySun Yat-Sen UniversityGuangzhou 510275China School of Materials Sun Yat-Sen UniversityShenzhen 518107China School of Environment and Energy Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and RecyclingSouth China University of TechnologyGuangzhou 510006China

It has been proved to be an effective route to efficiently ameliorate photocatalytic performance of catalysts via designing three-dimensional(3D)hierarchical nanostructures and constructing oxygen vacancies(VOs).However,controlling the self-assembly of organization into 3D hierarchical nanostructures while introducing VOs in photocatalysts remains a ***,we reported an ethylene glycol(EG)mediated approach to craft 3D hydrangea-structure Bi_(2)MoO_(6)with VOs for efficient photocatalytic degradation of *** manipulating the EG concentration during the fabrication process,the influence of EG concentration on the Bi_(2)MoO_(6)structure was systematically *** could promote the self-assembly of Bi_(2)MoO_(6)nanosheets to form a 3D hierarchical *** with 2D nanoplates,3D hierarchical architecture enhanced the surface area and the amount of active sites of Bi_(2)MoO_(6).In addition,the reduction effect of EG on metallic oxide enabled the generation of VOs in Bi_(2)MoO_(6).The VOs adjusted the electronic structure of Bi_(2)MoO_(6),which not only enhanced the light harvesting,but also facilitated the simultaneous utilization of photo-induced electrons and holes to form reactive oxygen species(·O2−and·OH)for the efficient tetracycline decomposition.3D Bi_(2)MoO_(6)hydrangea with VOs achieved a 79.4%removal efficiency of tetracycline after 75 *** work provides a simple yet robust EG-mediated strategy,which not only promotes the self-assembly of nano-catalysts into 3D hierarchical architectures,but also crafts tunable VOs for highly efficient photocatalysis.

关键词： three-dimensional(3D)hierarchical nanostructures tunable oxygen vacancies ethylene glycol(EG)-mediated strategy bismuth molybdate photocatalytic degradation tetracycline

Thermal-hydraulic performance analysis and multi-objective optimization of a microchannel with staggered semi-elliptical ribs

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Science China Technological Sciences 2024年第10期67卷 3152-3167页

作者： CUI Pan liu Wei liu ZhiChun School of Energy and Power Engineering Huazhong University of Science and Technology

To enhance the cooling capacity of traditional microchannels for high heat flux electronic devices,a microchannel design with staggered semi-elliptical ribs is proposed in this *** numerical simulations,the flow characteristics of the designed microchannel are compared with those of a smooth one,and the effects of rib width（Wr）,rib height（Hr）,and rib length（Lr）,on the thermal-hydraulic performance are investigated under laminar flow *** results show that the periodically arranged ribs induce periodic vortices within the microchannel,effectively promoting fluid mixing and enhancing heat *** Hrhave similar effects on microchannel performance,with an increase in them leading to an enhanced thermal performance at the expense of deteriorated hydraulic ***,Lrhas a comparatively weaker influence,with both the heat transfer and flow resistance initially growing with increasing Lrand then *** strike a balance between the two performances,a multi-objective optimization on the three geometrical parameters is conducted at a Reynolds number（Re） *** with simulation data,artificial neural networks are trained as surrogate models,and a multi-objective genetic algorithm is employed to derive the Pareto *** the TOPSIS decision-making method,an optimal compromise solution is determined as Wr=0.2415 mm,Hr=0.0976 mm,and Lr=0.6486 *** testing on the optimized microchannel reveals that it exhibits high heat transfer,middle flow resistance,and excellent overall performance,with the performance evaluation criterion（PEC） falling between 1.572 and 1.723 within the Re range of 220–660.

关键词： heat transfer enhancement microchannel semi-elliptical rib numerical simulation multi-objective optimization

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混凝土-CA砂浆复合试件界面端奇异应力场消除方法研究

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铁道科学与工程学报 2018年第9期15卷 2232-2239页

作者：曹世豪李佳莉康维新刘学毅西南交通大学高速铁路线路工程教育部重点实验室四川成都610031

为研究混凝土-CA砂浆双材料界面端的应力场奇异性,建立混凝土-CA砂浆双材料复合试件轴拉计算模型,并对界面拉应力分布进行分析。基于Bogy特征方程,提出消除混凝土-CA砂浆复合试件界面端奇异性的方法。研究结果表明:混凝土与CA砂浆界面... 详细信息

为研究混凝土-CA砂浆双材料界面端的应力场奇异性,建立混凝土-CA砂浆双材料复合试件轴拉计算模型,并对界面拉应力分布进行分析。基于Bogy特征方程,提出消除混凝土-CA砂浆复合试件界面端奇异性的方法。研究结果表明:混凝土与CA砂浆界面端附近存在应力奇异现象,该应力奇异现象使得界面端点处的应力明显增加。当结合角组合θ1=θ2≤72°时,混凝土-CA砂浆界面端的应力奇异性消失,此时应力场为一定值。研究成果可为精确的双材料界面黏结强度试验提供理论依据。

关键词：板式无砟轨道双材料界面端应力奇异性 Bogy特征方程结合角组合

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双块式无砟轨道枕边裂纹水力特性研究

铁道科学与工程学报 2016年第2期13卷 219-225页

作者：谢露刘学毅曹世豪杨荣山西南交通大学高速铁路线路工程教育部重点实验室四川成都610031

针对双块式无砟轨道枕边裂纹,采用ANSYS计算软件,建立流固耦合三维模型,在列车荷载和水耦合作用下,对双块式无砟轨道枕边裂纹内部动水压力和水流速度的分布和变化规律进行模拟计算,为双块式无砟轨道枕边裂纹的防治和维修提供理论基础。... 详细信息

针对双块式无砟轨道枕边裂纹,采用ANSYS计算软件,建立流固耦合三维模型,在列车荷载和水耦合作用下,对双块式无砟轨道枕边裂纹内部动水压力和水流速度的分布和变化规律进行模拟计算,为双块式无砟轨道枕边裂纹的防治和维修提供理论基础。研究结果表明:裂纹内水压力最大值发生在裂纹中部尖端处,而最大水流速度发生在裂纹中部出口处;最大水压力和最大水流速度随着荷载幅值和频率的增加而增加,且荷载频率对水压力和水流速度的影响较大;随着裂纹开口量的增加,最大水压力和最大水流速度反而减小,但裂纹深度越深,最大水压力越大,且最大水流速度随着裂纹深度的增加最后成线性增加趋势。因此,裂纹深度是影响枕边裂纹水压力和水流速度的一个关键因素。

关键词：双块式无砟轨道枕边裂纹流固耦合最大水压力最大水流速度

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Q345C钢板探伤不合格原因分析

热加工工艺 2008年第18期37卷 102-105页

作者：江卫华刘学一吴斌李战军首钢技术研究院宽厚板研究所北京100041

通过取样分析,研究了冶炼、轧制以及轧后控冷工艺对Q345C钢板微观组织及探伤结果不合格的影响。结果表明:中心偏析、裂纹、轧后水冷、MnS等夹杂物以及氢均对钢板的探伤结果造成不利影响。

关键词： Q345C钢板超声波探伤微观组织内部质量

Revealing the role of electrode potential micro-environments in single Mn atoms for carbon dioxide and oxygen electrolysis

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Nano Research 2024年第9期17卷 7957-7966页

作者： Pengcheng liu anyi liu Kaili Wang Shuai Shi Mengmeng Jin Jingxiu liu Tao Qin Qian liu Xijun liu Jia He Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion School of Chemistry and Chemical EngineeringInstitute of New-Energy Materials and Low-Carbon TechnologiesSchool of Materials Science and EngineeringTianjin University of TechnologyTianjin 300384China School of Chemistry and Chemical Engineering and Environmental Engineering Weifang UniversityWeifang 261061China Department of Electrical Engineering and Automation Luoyang Institute of Science and TechnologyLuoyang 471023China Institute for Advanced Study Chengdu UniversityChengdu 610106China State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured MaterialsSchool of ResourcesEnvironment and MaterialsGuangxi UniversityNanning 530004China

Elucidation the relationship between electrode potentials and heterogeneous electrocatalytic reactions has attracted widespread *** we construct the well-defined Mn single-atom(MnSA)catalyst with four N-coordination through a simple thermal pyrolysis preparation method to investigate the electrode potential micro-environments effect on carbon dioxide reduction reactions(CO_(2)RR)and oxygen reduction reactions(ORR).MnSA catalysts generate higher CO production Faradaic efficiency of exceeding 90%at-0.9 V for CO_(2)RR and higher H_(2)O_(2)yield from 0.1 to 0.6 V with excellent ORR *** functional theory(DFT)calculations based on constant potential models were performed to study the mechanism of MnSA on CO_(2)*** thermodynamic energy barrier of CO_(2)RR is lowest at-0.9 V *** hydrogen electrode(RHE).Similar DFT calculations on the H_(2)O_(2)yield of ORR showed that the H_(2)O_(2)yield at 0.2 V was *** study provides a reasonable explanation for the role of electrode potential micro-environments.

关键词： electrode potential micro-environments Mn single-atom catalyst carbon dioxide reduction reaction oxygen reduction reaction constant potential models