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Low‐dimensional material supported single‐atom catalysts for electrochemical CO_(2) reduction

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SmartMat 2022年第1期3卷 84-110页

作者： Bingqing Wang Shenghua Chen zedong zhang Dingsheng Wang Department of Chemistry Tsinghua UniversityBeijingChina

Converting CO_(2) emissions to valuable carbonaceous chemicals/fuels under mild conditions provides a sustainable way to maintain carbon balance and alleviate the energy shortage.Low‐dimensional material(LDM)supported single‐atom catalysts(SACs)have been attracted significant attention for electrochemical CO_(2) reduction reaction(ECR)in recent years.This is mainly because integrating the single‐atoms and LDMs can inherit the advantages of themselves and the synergy effects between them are potential to enhance the ECR performance.In this review,we summarized the strategies for synthesizing LDM supported SACs for ECR,and different LDM supported SACs for ECR have been briefly introduced.Moreover,some optimization strategies for LDM supported SACs towards CO_(2) electroreduction are highlighted.At the end of this review,the perspectives and challenges of LDM supported SACs for ECR are provided.

关键词： ECR electrochemical CO_(2)reduction low‐dimensional material single‐atom catalysts

海拔对隧道救援站列车火灾烟气蔓延特性的影响

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中南大学学报（自然科学版） 2024年第4期55卷 1602-1617页

作者：周丹张则栋陈涛李金柱陈光中南大学交通运输工程学院轨道交通安全教育部重点实验室湖南长沙410075 中南大学轨道交通安全关键技术国际合作联合实验室湖南长沙410075 中南大学轨道交通列车安全保障技术国家地方联合工程研究中心湖南长沙410075

采用三维非定常N-S方程和完全浮力修正的RNG k-ε湍流模型,基于滑移网格技术实现列车在隧道内的运动过程模拟,构建高海拔隧道紧急救援站列车火灾数值模拟方法,并利用现有动模型试验和隧道静止火灾试验数据验证数值模拟方法的可靠性和正... 详细信息

采用三维非定常N-S方程和完全浮力修正的RNG k-ε湍流模型,基于滑移网格技术实现列车在隧道内的运动过程模拟,构建高海拔隧道紧急救援站列车火灾数值模拟方法,并利用现有动模型试验和隧道静止火灾试验数据验证数值模拟方法的可靠性和正确性,研究海拔对事故隧道、紧急救援站和列车中部车厢附近横通道内的烟气流速和温度分布的影响规律。研究结果表明:当着火列车驶入隧道紧急救援站时,活塞风主导了火灾烟气的蔓延趋势;在列车停车瞬间,随着海拔增大,事故隧道拱顶处和列车中部车厢附近横通道拱顶处的烟气流速峰值及温度峰值逐渐增大;列车停车后,活塞风逐渐衰减,烟气开始在隧道拱顶处向火源上游逆流;随着海拔增大,紧急救援站下游高温区域蔓延范围逐渐扩大,事故隧道拱顶处温度峰值随之升高;随着时间推移,高海拔与低海拔隧道拱顶处的温度峰值差异逐渐增大,可能对更高海拔隧道救援站内的人员安全造成更大的威胁;不同海拔处列车中部车厢附近横通道内人眼高度处的温度均超过330 K(对人体有危害),且在同一时刻,海拔越高,横通道内高温烟气层高度越低,烟气沉降速度明显加快。

关键词：高海拔列车火灾隧道紧急救援站烟气蔓延

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浅析非遗食品加工技艺的现代化转型与市场推广策略

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现代食品 2024年第6期30卷 124-126页

作者：张泽东北京海风悠歌餐饮管理有限公司北京100000

非物质文化遗产是中华民族悠久历史和灿烂文化的结晶,其中的食品加工技艺更凝聚了先民的智慧和创造力,形成了独特的风味和品质,成为我国饮食文化的瑰宝。因此,本文分析了非遗食品加工技艺的现代化转型与推广策略,旨在促进非遗食品加工... 详细信息

非物质文化遗产是中华民族悠久历史和灿烂文化的结晶,其中的食品加工技艺更凝聚了先民的智慧和创造力,形成了独特的风味和品质,成为我国饮食文化的瑰宝。因此,本文分析了非遗食品加工技艺的现代化转型与推广策略,旨在促进非遗食品加工行业的发展。

关键词：非遗食品加工技艺现代化转型市场推广

Quantitative analysis of distributed and centralized development of renewable energy

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Global Energy Interconnection 2018年第5期1卷 576-584页

作者： Xiaolu Wang Nana Li Wei Sun Shan Xu zedong zhang State Grid Energy Research Institute CO. Ltd Global Energy Interconnection Development and Cooperation Organization

Global renewable energy has maintained a steady growth in recent years, mainly fostered by national policies and increasing demand. Analyzing the experience of renewable energy development in developed countries can be important to provide reference and guidance for its adoption in other countries. First, we compare and summarize definitions of distributed generation from 18 leading countries and organizations in renewable energy. On this basis, we provide three basic characteristics for successful distributed generation using renewable resources. Then, we empirically analyze the distributed and centralized development of renewable energy in Germany with focus on wind and photovoltaic power. We determined that 95% of the photovoltaic generation and 85% of the wind power generation is distributed in Germany, suggesting that the most suitable generation mode for renewable energy is the distributed approach.

关键词： Renewable energy Development mode Distributed generation Centralized generation

习近平总书记关于党的文化领导权重要论述的理论渊源、丰富内涵和实践路径

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东华大学学报（社会科学版） 2024年第2期24卷 1-7页

作者：张泽栋郑丽平上海交通大学马克思主义学院上海200240

习近平总书记关于党的文化领导权重要论述是新时代党领导文化建设的行动指南和根本遵循,是习近平文化思想的重要内容。它守正创新,继承和发展了马克思主义文化领导权理论,赋予其新的时代内涵和现实价值;它洞察大势,深刻总结了党领导文... 详细信息

习近平总书记关于党的文化领导权重要论述是新时代党领导文化建设的行动指南和根本遵循,是习近平文化思想的重要内容。它守正创新,继承和发展了马克思主义文化领导权理论,赋予其新的时代内涵和现实价值;它洞察大势,深刻总结了党领导文化建设的历史经验,实现了对重大时代命题的理论提炼和升华;以加强党的建设、巩固意识形态阵地、建强人才队伍为实践路径,科学回答了建设社会主义文化强国的时代之问。

关键词：文化领导权意识形态马克思主义习近平文化思想

冷轧及退火工艺对5083铝合金薄板组织性能的影响

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轻合金加工技术 2024年第1期52卷 23-27页

作者：张泽东刘晓滕曹零勇宝武铝业科技有限公司河南三门峡472000

利用金相显微镜、拉伸试验机、弯曲试验机对5083O铝合金板材在不同冷轧加工率(5%~40%)和不同退火温度(120~280℃)下的微观组织、拉伸力学性能、弯曲性能进行了系统研究。研究结果表明,5083O铝合金板材晶粒为细小均匀的等轴晶。随着冷轧... 详细信息

利用金相显微镜、拉伸试验机、弯曲试验机对5083O铝合金板材在不同冷轧加工率(5%~40%)和不同退火温度(120~280℃)下的微观组织、拉伸力学性能、弯曲性能进行了系统研究。研究结果表明,5083O铝合金板材晶粒为细小均匀的等轴晶。随着冷轧加工率从5%增加至40%,晶粒逐渐被压扁、拉长。冷轧加工率不大于10%的板材折弯性能良好;当冷轧加工率为20%时,弯曲样品外侧出现凹凸不平的颈缩区域;当冷轧加工率增加到30%时,折弯样品出现微裂纹;当加工率增加到40%时,裂纹数量增多、尺寸增大。随着退火温度从120℃增加到280℃,不同冷轧加工率的板材屈服强度和抗拉强度呈单调下降趋势,而且屈服强度的降幅大于抗拉强度的降幅,断后伸长率呈单调增加趋势。当冷轧加工率为20%时,需对板材进行200℃以上的退火处理才能满足折弯性能要求;当冷轧加工率增加至30%和40%时,需要对板材进行240℃以上的退火处理才能满足折弯性能要求。

关键词：新能源汽车电池包 5083铝合金薄板微观组织力学性能

Resilience-Oriented Load Restoration Method and Repair Strategies for Regional Integrated Electricity-Natural Gas System

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Energy Engineering 2024年第4期121卷 1091-1108页

作者： Keqiang Wang Pengyang Zhao Changjian Wang Zimeng zhang Yu zhang Jia Lu zedong Yang Baicheng Power Supply Company State Grid Jilin Electric Power Co.Ltd.Baicheng137000China School of Electrical Engineering Northeast Electric Power UniversityJilin132012China

The rising frequency of extreme disaster events seriously threatens the safe and secure operation of the regional integrated electricity-natural gas system(RIENGS).With the growing level of coupling between electric and natural gas systems,it is critical to enhance the load restoration capability of both systems.This paper proposes a coordinated optimization strategy for resilience-enhanced RIENGS load restoration and repair scheduling and transforms it into a mixed integer second-order cone programming(MISOCP)model.The proposed model considers the distribution network reconfiguration and the coordinated repair strategy between the two systems,minimizing the total system load loss cost and repair time.In addition,a bi-directional gas flow model is used to describe the natural gas system,which can provide the RIENGS with more flexibility for load restoration during natural gas system failure.Finally,the effectiveness of the proposed approach is verified by conducting case studies on the test systems RIENGS E13-G7 and RIENGS E123-G20.

关键词： Resilience regional integrated electricity-natural gas system load restoration repair strategy

Template-assisted growth of Co-BaTiO_(3) vertically aligned nanocomposite thin films with strong magneto-optical coupling effect

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Nano Research 2024年第4期17卷 3130-3138页

作者： zedong Hu Juanjuan Lu Hongyi Dou Jianan Shen James PBarnard Juncheng Liu Xinghang zhang Haiyan Wang School of Electrical and Computer Engineering Purdue UniversityWest LafayetteIN 47906USA School of Materials Engineering Purdue UniversityWest LafayetteIN 47906USA

Oxide-metal based nanocomposite thin films have attracted great interests owing to their unique anisotropic structure and physical properties.A wide range of Au-based oxide-metal nanocomposites have been demonstrated,while other metal systems are scarce due to the challenges in the initial nucleation and growth as well as possible interdiffusions of the metallic nanopillars.In this work,a unique anodic aluminum oxide(AAO)template was used to grow a thin Co seed layer and the following self-assembled metal-oxide(Co-BaTiO_(3))vertically aligned nanocomposite thin film layer.The AAO template allows the uniform growth of Co-seeds and successfully deposition of highly ordered Co pillars(with diameter<5 nm and interval between pillars<10 nm)inside the oxide matrix.Significant magnetic anisotropy and strong magneto-optical coupling properties have been observed.A thin Au-BaTiO_(3) template was also later introduced for further enhanced nucleation and ordered growth of the Co-nanopillars.Taking the advantage of such a unique nanostructure,a large out-of-plane(OP)coercive field(Hc)of~5000 Oe has been achieved,making the nanocomposite an ideal candidate for high density perpendicular magnetic tunneling junction(p-MTJ).A strong polar magneto-optical Kerr effect(MOKE)has also been observed which inspires a novel optical-based reading method of the MTJ states.

关键词： vertically aligned nanocomposite(VAN) Co BaTiO_(3) thin film magneto-optical coupling magnetic anisotropy

基于AdaBelief的Heavy-Ball动量方法

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模式识别与人工智能 2022年第2期35卷 106-115页

作者：张泽东陇盛鲍蕾陶卿中国人民解放军陆军炮兵防空兵学院信息工程系合肥230031

同时使用动量和自适应步长技巧的自适应矩估计(Adaptive Moment Estimation,Adam)型算法广泛应用于深度学习中.针对此方法不能同时在理论和实验上达到最优这一问题,文中结合AdaBelief灵活调整步长提高实验性能的技巧,以及仅采用指数移... 详细信息

同时使用动量和自适应步长技巧的自适应矩估计(Adaptive Moment Estimation,Adam)型算法广泛应用于深度学习中.针对此方法不能同时在理论和实验上达到最优这一问题,文中结合AdaBelief灵活调整步长提高实验性能的技巧,以及仅采用指数移动平均(Exponential Moving Average,EMA)策略调整步长的Heavy-Ball动量方法加速收敛的优点,提出基于AdaBelief的Heavy-Ball动量方法.借鉴AdaBelief和Heavy-Ball动量方法收敛性分析的技巧,巧妙选取时变步长、动量系数,并利用添加动量项和自适应矩阵的方法,证明文中方法对于非光滑一般凸优化问题具有最优的个体收敛速率.最后,在凸优化问题和深度神经网络上的实验验证理论分析的正确性,并且证实文中方法可在理论上达到最优收敛性的同时提高性能.

关键词： AdaBelief Heavy-Ball动量方法个体收敛速率深度神经网络