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记忆或遗忘——人们如何处理数字“身后事”

北京印刷学院学报 2024年第2期32卷 36-41页

作者：董嘉楠谢巍北京印刷学院北京102600

数字技术的发展不断延续逝者在社会中存在的时间和影响。数字遗产作为一种新型媒介形式正在重构用户生前逝后的媒介实践,年轻一代更愿意对自己的数字遗产进行生前管理,有选择地封存一个“数字自我”留置于网络空间。在这一过程中,数字... 详细信息

数字技术的发展不断延续逝者在社会中存在的时间和影响。数字遗产作为一种新型媒介形式正在重构用户生前逝后的媒介实践,年轻一代更愿意对自己的数字遗产进行生前管理,有选择地封存一个“数字自我”留置于网络空间。在这一过程中,数字遗产发挥着作为情感媒介、表演媒介与记忆媒介的功能,影响生者与逝者的数字交往。

关键词：数字遗产数字痕迹数字化数字自我数字隐私

Electric field control by permittivity functionally graded and superficially non-linear conductivity materials for DC-GIS spacer

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High Voltage 2022年第5期7卷 992-1000页

作者： Boxue Du jianan dong Hucheng Liang School of Electrical and Information Engineering Tianjin UniversityTianjinChina

This paper offers a simulation study on the application of a novel approach to control the electric field around a basin-type spacer by combining permittivity functionally graded materials(ε-FGM)and superficially non-linear conductivity materials(SNCM),namely multi-dimensional functional materials(MDFM).The permittivity distribution of theε-FGM spacer is designed by the iteration optimization algorithm,and the epoxy/SiC composites with 30 and 60 phr doping contents are assigned as the coating materials of two SNCM spacers,namely SNCM30 and *** MDFM spacer combinesε-FGM in its bulk and SNCM60 on its *** electric field regulation effect of each functional spacer is investigated under variable conditions,that is,DC steady state(DC-steady),DC turn-on state(DC-on),DC polarity reversal(DC-PR),and DC superimposed with switching impulse voltage(DC-SI).Results show that the applicability ofε-FGM and SNCM is limited to transient and stationary conditions,*** MDFM spacer combines the advantages ofε-FGM and SNCM for adaptively relaxing the electric field under all the above *** is hoped that this research will be beneficial to the development and application of spacers for the direct current gas-insulated switchgear(DC-GIS).

关键词： composites graded field

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“电机学”课程虚拟仿真实验建设

实验室科学 2024年第2期27卷 171-174页

作者：谷爱昱董佳楠郭艺伟广东工业大学自动化学院广东广州510006

电机学实验是工程基础课程“电机学”必要环节。针对理论教学中存在概念难理解、现象直观性差,实物实验内容全面性不足的问题,将有限元虚拟仿真技术应用于实验教学中,直观展示电机的运行机理和电磁特性,解决教学难题。在阐述虚拟仿真实... 详细信息

电机学实验是工程基础课程“电机学”必要环节。针对理论教学中存在概念难理解、现象直观性差,实物实验内容全面性不足的问题,将有限元虚拟仿真技术应用于实验教学中,直观展示电机的运行机理和电磁特性,解决教学难题。在阐述虚拟仿真实验建设思路的基础上,以变压器仿真实验建设为例说明虚拟仿真实验设计方法和开展过程。教学实践证明,在电机实验教学中开展虚拟仿真实验,保证了实验内容的全面性和系统性,学生的工程实践能力和创新意识得到提高。

关键词：电机学实验教学虚拟仿真变压器

Facile molybdenum and aluminum recovery from spent hydrogenation catalyst

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Chinese Journal of Chemical Engineering 2024年第5期69卷 72-78页

作者： Zhenhui Lv jianan Li dong Xue Tao Yang Gang Wang Chong Peng State Key Laboratory of Fine Chemicals School of Chemical EngineeringDalian University of TechnologyDalian 116024China Dalian Research Institute of Petroleum and Petrochemicals SINOPECDalian 116041China

Industrial catalyst waste has emerged as a hazardous pollutant that requires safe and proper disposal after the unloading *** a valuable and sustainable strategy for its treatment is a significant challenge compared to traditional *** this study,we present a facile method for the recovery of molybdenum and aluminum contents from spent Mo-Ni/Al_(2)O_(3) hydrogenation catalysts through crystallization separation and ***,the recovered molybdenum and aluminum are utilized as active metals and carriers for the preparation of new *** properties were thoroughly analyzed and investigated using various characterization *** hydrogenation activity of these newly prepared catalysts was evaluated on a fixed-bed small-scale device and compared with a reference catalyst synthesized from commercial raw ***,the hydrogenation activity of the catalysts was further assessed by using the entire distillate oil of coal liquefaction as the raw oil,specifically focusing on denitrogenation and aromatic *** work not only offers an effective solution for recycling catalysts but also promotes sustainable development.

关键词： Waste treatment Alumina Hydrogenation Catalyst Crystallization Precipitation

Multifunctional Sodium Gluconate Electrolyte Additive Enabling Highly Reversible Zn Anodes

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Chemical Research in Chinese Universities 2024年第4期40卷 722-729页

作者： ZHAO Kang ZHAO jianan YU Meng LIU Fangming dong Yang WANG Shiwen CHENG Fangyi College of Chemistry Nankai UniversityTianjin300071P.R.China College of New Energy Zhengzhou University of Light IndustryZhengzhou450002P.R.China

Sodium gluconate(SG)is reported as an electrolyte additive for rechargeable aqueous zinc *** SG addition is proposed to modulate the nucleation overpotential and plating behaviors of Zn by forming a shielding buffer layer because of the adsorption priority and large steric hindrance effect,which contributes to limited rampant Zn^(2+)diffusion and mitigated hydrogen evolution and *** the introduction of 30 mmol/L SG in 2 mol/L ZnSO_(4)electrolyte,the Zn anode harvests a reversible cycling of 1200 h at 5 mA/cm^(2)and a high average Coulombic efficiency of Zn plating/stripping(99.6%).Full cells coupling Zn anode with V_(2)O_(5)·1.6H_(2)O or polyaniline cathode far surpass the SG additivefree batteries in terms of cycle stability and rate *** work provides an inspiration for design of a high-effective and low-cost electrolyte additive towards Zn-based energy storage devices.

关键词： Electrolyte additive Zn anode Sodium gluconate Adsorption Zn dendrite

Navigation for autonomous vehicles via fast-stable and smooth reinforcement learning

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Science China(Technological Sciences) 2024年第2期67卷 423-434页

作者： ZHANG RuiXian YANG jianan LIANG Ye LU ShengAo dong YiFei YANG BaoQing ZHANG LiXian School of Astronautics Harbin Institute of TechnologyHarbin 150001China

This paper investigates the navigation problem of autonomous vehicles based on reinforcement learning(RL)with both stability and smoothness *** introducing a data-based Lyapunov function,the stability criterion in mean cost is obtained,where the Lyapunov function has a property of fast ***,an off-policy RL algorithm is proposed to train safe policies,in which a more strict constraint is exerted in the framework of model-free RL to ensure the fast convergence of policy generation,in contrast with the existing RL merely with stability *** addition,by simultaneously introducing constraints on action increments and action distribution variations,the difference between the adjacent actions is effectively alleviated to ensure the smoothness of the obtained policy,instead of only seeking the similarity of the distributions of adjacent actions as commonly done in the past literature.A navigation task of a ground differentially driven mobile vehicle in simulations is adopted to demonstrate the superiority of the proposed algorithm on the fast stability and smoothness.

关键词： autonomous vehicles navigation reinforcement learning smoothness stability

直流GIL表层功能梯度绝缘子参数设计与电场优化

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高压电器 2023年第9期59卷 106-112页

作者：姚航杜伯学梁虎成董佳楠天津大学电气自动化与信息工程学院智能电网教育部重点实验室天津300072

为调控直流稳态与极性反转工况下直流气体绝缘输电线路(HVDC GIL)绝缘子的沿面电场分布,分别设计了稳态梯度(ST-SFGM)绝缘子与极反梯度(PR-SFGM)绝缘子。迭代优化后的SFGM绝缘子涂层电导率恒定,厚度沿r坐标方向减小。电场仿真结果表明,... 详细信息

为调控直流稳态与极性反转工况下直流气体绝缘输电线路(HVDC GIL)绝缘子的沿面电场分布,分别设计了稳态梯度(ST-SFGM)绝缘子与极反梯度(PR-SFGM)绝缘子。迭代优化后的SFGM绝缘子涂层电导率恒定,厚度沿r坐标方向减小。电场仿真结果表明,直流稳态工况下均匀绝缘子的最大电场出现在高压三结合点附近,强度为4.25 kV/mm。ST-SFGM绝缘子与PR-SFGM绝缘子的直流电场分布较为均匀,最大电场强度分别下降54.6%与62.1%。极性反转工况下,均匀绝缘子与ST-SFGM绝缘子的电场畸变加剧,最大电场强度分别提升1.09和3.44倍,而PR-SFGM绝缘子的最大电场强度则基本保持不变。

关键词：直流极性反转功能梯度绝缘子参数设计电场调控

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短视频在父亲支持母乳喂养健康教育中的应用

护理学杂志 2023年第2期38卷 69-72页

作者：董家男李秀荣王娟张银铃耿素格河北医科大学第四医院产科河北石家庄050011

目的探讨基于短视频的健康教育在父亲支持母乳喂养中的应用效果。方法选取103对住院分娩的初产妇及其配偶按照住院时间顺序分组。对照组52对,给予常规健康教育;干预组51对,在常规健康教育的基础上增加基于短视频的健康教育。结果干预组... 详细信息

目的探讨基于短视频的健康教育在父亲支持母乳喂养中的应用效果。方法选取103对住院分娩的初产妇及其配偶按照住院时间顺序分组。对照组52对,给予常规健康教育;干预组51对,在常规健康教育的基础上增加基于短视频的健康教育。结果干预组产后42 d父亲支持母乳喂养自我效能评分、初产妇对配偶参与母乳喂养满意度评分、产后3 d及42 d纯母乳喂养率显著优于对照组(均P<0.05)。结论基于短视频的健康教育能够提高父亲支持母乳喂养自我效能,提升产妇对配偶参与母乳喂养的满意度,进而促进纯母乳喂养。

关键词：初产妇配偶母乳喂养健康教育短视频自我效能父亲支持母乳喂养

基于TRNSYS的太阳能水源热泵系统优化研究

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南京理工大学学报 2015年第4期39卷 494-499页

作者：曲世琳王东旭董家男彭莉北京科技大学机械工程学院北京100083

为提高太阳能水源热泵耦合系统性能,该文从设计及运行两方面对其进行优化研究。在建立太阳能水源热泵耦合系统应用模型的基础上,用瞬时系统模拟程序(Transient system simulation program,TRNSYS)软件搭建系统计算模型,以系统的设计参数... 详细信息

为提高太阳能水源热泵耦合系统性能,该文从设计及运行两方面对其进行优化研究。在建立太阳能水源热泵耦合系统应用模型的基础上,用瞬时系统模拟程序(Transient system simulation program,TRNSYS)软件搭建系统计算模型,以系统的设计参数如:太阳能集热器面积、储热水箱体积及集热器倾角等为变量,利用GENOPT软件对系统进行优化。并以系统运行控制参数如:集热器供回水温差和供暖末端供回水温差为变量分析系统性能参数(Coefficient of performance,COP),分析系统节能潜力。该文以北京某别墅为研究对象进行优化,结果表明系统COP升高、性能得到改善。研究结果为太阳能热泵系统优化提供了一定的理论依据。

关键词：太阳能集热器储热水箱热泵系统性能参数瞬时系统模拟程序系统优化运行策略