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Theory-driven designed TiO_(2)@MoO_(2)heterojunction:Balanced crystallinity and nanostructure toward desirable kinetics and highrate sodium-ion storage

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Nano Research 2023年第4期16卷 4941-4949页

作者： Junyi Yin Pengqi Hai Yuan Gao zihan gan Chao Wu Yonghong Cheng Xin Xu State Key Laboratory of Electrical Insulation and Power Equipment Center of Nanomaterials for Renewable EnergySchool of Electrical EngineeringXi’an Jiaotong UniversityXi’an 710049China Frontier Institute of Science and Technology Xi’an Jiaotong UniversityXi’an 710049China

Sodium-ion batteries(SIBs)are promising candidates for large-scale energy storage due to their cost effectiveness and the unlimited availability of sodium.However,there remains a need for the rational design of better anodic materials than are currently available,as these materials are critical for the sodium-ion storage process.In this work,theoretical calculations were performed to design a conceptually novel TiO_(2)@MoO_(2)heterojunction(TMH)anode that was expected to exhibit better electrochemical performance than current anodes.The TMH anode was fabricated via a facile and cost-effective method,and the results of in-depth sodium-ion-storage performance and reaction kinetics analyses indicate that it exhibited an excellent rate capability and enhanced pseudocapacitive response,due to its high crystallinity.This electrochemical performance was superior to that of previously reported anodic materials,confirming the accuracy of the theoretical calculations.Destruction of TMH’s nanostructure at high temperatures resulted in a decrease in its electrochemical performance,indicating the key role played by the nanostructure in TMH’s ability to store sodium ions.This study demonstrates that integration of theoretical predictions with experimental investigations offers insights into how materials’crystallinity and nanostructure affect their pseudocapacitive sodiumion storage capabilities,which will help to guide the rational design of effective anodic materials for SIBs.

关键词： theory-driven electrode development heterojunction crystallinity nanostructure enhanced pseudocapacitive response

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煅烧温度对煅后石油焦微观结构演变的影响

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中国有色冶金 2024年第1期53卷 8-16页

作者：犹子涵肖劲于谱生周宇甘小双仲奇凡中南大学冶金与坏境学院湖南长沙410083 济南澳海炭素有限公司山东济南250101

煅后石油焦是铝电解用炭阳极等冶金炭素材料的主要原料,现有研究缺乏对不同煅烧温度下煅后焦微观结构演变的深入探索,导致冶金炭素材料的制备难以智能调控,降耗困难。针对上述问题,本文利用一种基于高分辨适射电镜(HRTEM)检测的碳材料... 详细信息

煅后石油焦是铝电解用炭阳极等冶金炭素材料的主要原料,现有研究缺乏对不同煅烧温度下煅后焦微观结构演变的深入探索,导致冶金炭素材料的制备难以智能调控,降耗困难。针对上述问题,本文利用一种基于高分辨适射电镜(HRTEM)检测的碳材料晶格条纹智能提取技术,结合数学拟合对不同煅烧温度下煅后焦微观结构的演变规律进行了深入探究。结果表明,煅后焦的平均晶格条纹长度、堆叠占比和45°集中分布的特征值在600℃以下会随温度升高而轻微劣化,而在600~1 600℃的温度范围内,各项微观结构特征值的变化规律符合Sigmoid函数模型,随着温度升高先迅速提升后平缓增加;利用拟合曲线的推导公式求得煅后焦各项微观结构特征的有效升温区间,进一步得到煅后焦微观结构特征随温度变化而演变的优先级为晶格取向>晶格堆叠>晶格尺寸生长;通过拉曼光谱分析得到煅后焦的石墨化度R值在25~1 600℃的温度范围内由0.86变化到0.59,石墨化度在不同温度下的变化规律映证了上述各项微观结构特征演变分析的结果。

关键词：冶金炭素煅后焦晶格条纹微观结构演变铝电解炭阳极煅烧

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Dispersion characteristics of switching transients from large‐scale experiments in a 1100 kV gas insulated switchgear circuit

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High Voltage 2023年第6期8卷 1253-1263页

作者： zihan Teng Weijiang Chen Jiangong Zhang Baoquan Wan Jun Zhao Kejie Li Zhenghai Liao Zheyuan gan State Key Laboratory of Power Grid Environmental Protection China Electric Power Research InstituteWuhanChina State Grid Corporation of China BeijingChina School of Electrical Engineering and Automation Hefei University of TechnologyHefeiChina

The switching operation of gas insulated switchgear(GIS)disconnector will produce multiple random spark discharges between the gas gaps of the disconnector.Each spark discharge can be affected by various random factors,such as trapped charge on the load side,the initial operating phase,gap distance and operating speed of the disconnector,leading to dispersion characteristics.At present,some studies have mentioned this dispersion,but its impact is still unclear due to the lack of experimental data,resulting in a deviation between the simulation results and the measured results.In this study,thousands of switching operations were carried out based on the 1100 kV full‐scale GIS circuit in Wuhan ultra‐high voltage alternating current Test Base.The maximal information coeffi-cient analysis,linear regression fitting and other statistical methods were used to discuss the dispersion characteristics of very fast transient overvoltage(VFTO)and transient enclosure voltage(TEV)from large‐scale experimental data.The results show that the dispersion of VFTO and TEV in amplitude aspects both increase gradually as the breakdown voltage increases,with the maximum difference of five times of TEV amplitude at normalised breakdown voltage.In terms of frequency characteristics,the dispersion of different fre-quency components in TEV is always greater than that of VFTO,especially for the high‐frequency components.Moreover,by comparing the frequency characteristics of TEV at different positions,we notice that the dispersion is almost independent of the spatial po-sition but only determined by the randomness of spark discharges.These discoveries reveal the importance of the dispersion in switching transients and make up for the lack of theoretical understanding of the correlation among them.

关键词： characteristics transient breakdown

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基于多视图关注网络的图文多模态情感分析模型

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现代电子技术 2024年第12期47卷 157-164页

作者：丛子涵张思佳大连海洋大学信息工程学院辽宁省海洋信息技术重点实验室辽宁大连116023 大连海洋大学设施渔业教育部重点试验室辽宁大连116023 大连市智慧渔业重点实验室辽宁大连116023

针对现有多模态情感分类模型无法全面、准确地捕获复杂的情感信息,以及融合过程中没有充分挖掘两者之间的潜在关联,导致模型结构冗余复杂、计算效率低下的问题,提出一种多视图关注网络(MPF-Net)模型。该模型通过引入多维感知特征捕获机... 详细信息

针对现有多模态情感分类模型无法全面、准确地捕获复杂的情感信息,以及融合过程中没有充分挖掘两者之间的潜在关联,导致模型结构冗余复杂、计算效率低下的问题,提出一种多视图关注网络(MPF-Net)模型。该模型通过引入多维感知特征捕获机制,全面而精确地获取图像和文本中蕴含的情感信息;其次,采用增强的记忆互动学习机制,使模型能够更加有效地提取和融合单模态特征,并在多轮迭代中不断更新和优化这些特征,从而捕捉到更深层次的情感细节;再构建一个高级深度学习框架,该框架采用生成对抗网络(gan)与池化技术的深度融合单元,以实现复杂数据特征的高效提取与整合;最后,在保留原有特征信息的基础上进行特征整合,同时通过降维技术降低模型的复杂性,提高计算效率。在公开数据集MVSA-Single和MVSA-Multiple以及自建数据集上通过实验验证所提模型的准确性,结果表明,与多个基线模型对比,所提模型的准确率和F1值均有所提高。

关键词：多模态情感分析对抗学习多视图网络生成对抗网络文本特征提取特征融合

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基于氨基酸成分的淡水珍珠及海水珍珠对比分析及近红外快速检测

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中草药 2024年第10期55卷 3477-3486页

作者：张紫涵王香颖李思维李启龙甘柳霜郝二伟杜正彩侯媛媛白钢邓家刚侯小涛广西中医药大学药学院广西南宁530200 广西中医药大学广西中药药效研究重点实验室广西南宁530200 农作物废弃物功能成分研究协同创新中心广西南宁530200 广西中医湿病方药理论与转化重点实验室广西南宁530200 南开大学药学院天津市分子药物研究重点实验室天津300071

目的基于关键氨基酸的含量差异,通过近红外技术实现淡水与海水珍珠的快速检测。方法采用氨基酸分析仪考察108批次海水珍珠与淡水珍珠氨基酸种类与含量差异,依据氨基酸比较分析筛选关键氨基酸。针对关键氨基酸优化近红外定量模型,确立近... 详细信息

目的基于关键氨基酸的含量差异,通过近红外技术实现淡水与海水珍珠的快速检测。方法采用氨基酸分析仪考察108批次海水珍珠与淡水珍珠氨基酸种类与含量差异,依据氨基酸比较分析筛选关键氨基酸。针对关键氨基酸优化近红外定量模型,确立近红外光谱技术珍珠快速检测模型。结果研究发现天冬氨酸(Asp)和甘氨酸(Gly)含量在淡水珍珠与海水珍珠有显著差异,且两者含量范围无交集。通过珍珠近红外光谱与Asp、Gly含量化学计量学拟合对珍珠样品进行检测,所得结果与传统的氨基酸分析技术测定结果一致。结论基于化学计量学手段对珍珠的定量分析,结果准确可靠,结合近红外光谱技术对不同基原珍珠进行快速检测,为珍珠的质量控制提供方法依据。

关键词：珍珠氨基酸定量测定近红外光谱技术快速检测

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Gene variations of glutamate metabolism pathway and epilepsy

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Acta Epileptologica 2022年第2期5卷 105-119页

作者： Yan Feng Cuirong Zhang zihan Wei Guoyan Li Yajing gan Chao Liu Yanchun Deng Xi’an Medical University Xi’an710021China Department of Neurology Epilepsy Center of Xijing HospitalFourth Military Medical UniversityXi’an710032China Department of Neurology QinHuang HospitalXi’an710600China

Background Epilepsy is a paroxysmal disorder of the brain,caused by an imbalance of neuronal excitation and inhibition.Glutamate is the most important excitatory neurotransmitter in the brain and plays an important role in epileptogenesis.Mutations in genes at any step/component of the glutamate metabolic pathway may lead to the development of epilepsy or epileptic encephalopathy.Methods Clinical history of 3 epilepsy patients with genetic variations of the glutamate metabolism pathway was collected.Electroencephalogram recording and magnetic resonance imaging were performed in each patient.We also reviewed recent literature for a variety of the genetic variations involved in epilepsy.Results Case 1 was a SLC1A2 mutation-carrier diagnosed with developmental and epileptic encephalopathy(DEE)41,whose seizures decreased after start of the ketogenic diet.Case 2 carried a GRIN2A gene mutation and was seizure-free for three years after taking levetiracetam and vitamin B6.Case 3 was a GRIN2B mutation-carrier diagnosed with DEE 27,who seizures diminished after taking oxcarbazepine.Conclusions Preclinical and clinical evidence supports the therapeutic potential of glutamatergic signaling-targeting treatments for epilepsy.More studies are needed to discover novel DEE-related genetic mutations in the glutamate metabolic pathway.

关键词： Glutamate Epilepsy Developmental and epileptic encephalopathy

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面向可调谐微波应用的Ba_(x)Sr_(1-x)TiO_(3)铁电薄膜材料与器件研究进展

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硅酸盐学报 2024年第1期52卷 229-239页

作者：沈德坤杨淄涵郭沛源赵梦玲葛健邓功勋王爱记北京师范大学多尺度自旋物理教育部重点实验室北京师范大学物理学系北京100875 中国科学院物理研究所北京100190

可调谐微波器件是相控阵雷达和现代移动通信技术的重要技术核心,具有广阔的应用前景和市场需求。Ba_(x)Sr_(1-x)TiO_(3)铁电薄膜材料因其高介电可调性和快速的场响应而被认为是可调谐微波器件最有前途的材料之一。目前,人们对该材料降... 详细信息

可调谐微波器件是相控阵雷达和现代移动通信技术的重要技术核心,具有广阔的应用前景和市场需求。Ba_(x)Sr_(1-x)TiO_(3)铁电薄膜材料因其高介电可调性和快速的场响应而被认为是可调谐微波器件最有前途的材料之一。目前,人们对该材料降低介质损耗和提升介电可调性方面的研究取得了众多进展。综述了近年来国内外有关Ba_(x)Sr_(1-x)TiO_(3)铁电薄膜的介电性能研究以及其在可调谐微波器件的发展现状,并探讨了其研究中所存在的主要问题及未来研究重点。

关键词：钛酸锶钡薄膜介电性能可调谐微波器件

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“工程材料与成型基础”课程的实际案例教学

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实验室科学 2024年第3期27卷 112-114,119页

作者：周子涵鞠恒丁晓非施伟贾华于赢水甘涌泉大连海洋大学机械与动力工程学院辽宁大连116023

“工程材料与成型基础”课程具有实践性强、内容多、综合性强、抽象度高等特性,因此将实际案例引入课堂教学中以提高教学效果。通过探究式案例的准备、思政元素的融入以及案例的主观分析考核等多种形式,将理论知识点融入课程教学实践中... 详细信息

“工程材料与成型基础”课程具有实践性强、内容多、综合性强、抽象度高等特性,因此将实际案例引入课堂教学中以提高教学效果。通过探究式案例的准备、思政元素的融入以及案例的主观分析考核等多种形式,将理论知识点融入课程教学实践中,使枯燥的理论具备可观性。通过与企业项目相结合的实际案例教学,强化知识在实际生产中的深度应用,让学生对未来的就业有较好的认知,同时也提高了学生的主动学习积极性及综合素质。

关键词：探究式案例思政元素校企合作综合素质

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Architectural proteins for the formation and maintenance of the 3D genome

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Science China(Life Sciences) 2020年第6期63卷 795-810页

作者： Mengfan Li Jingbo gan Yuao Sun zihan Xu Junsheng Yang Yujie Sun Cheng Li Peking-Tsinghua Center for Life Sciences Academy for Advanced Interdisciplinary Studies School of Life Sciences Peking UniversityBeijing 100871China State Key Laboratory of Membrane Biology School of Life Sciences Biomedical Pioneering Innovation Center (BIOPIC) Peking UniversityBeijing 100871China Center for Statistical Science Center for Bioinformatics School of Life Sciences Peking UniversityBejjing 100871China

Eukaryotic genomes are densely packaged into hierarchical three-dimensional(3D) structures that contain information about gene regulation and many other biological processes. With the development of imaging and sequencing-based technologies, 3D genome studies have revealed that the high-order chromatin structure is composed of hierarchical levels, including chromosome territories, A/B compartments, topologically associated domains, and chromatin loops. However, how this chromatin architecture is formed and maintained is not completely clear. In this review, we introduce experimental methods to investigate the 3D genome, review major architectural proteins that regulate 3D chromatin organization in mammalian cells, such as CTCF(CCCTC-binding factor), cohesin, lamins, and transcription factors, and discuss relevant mechanisms such as phase separation.

关键词： 3D genome architectural protein Hi-C

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Polymorphism dependent triplet-involved emissions of a pure organic luminogen

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Chinese Chemical Letters 2019年第4期30卷 933-936页

作者： zihan He Wenbo Li gan Chen Yongming Zhang Wang-Zhang Yuan School of Chemistry and Chemical Engineering Shanghai Key Lab of Electrical Insulation and Thermal Aging Shanghai Electrochemical Energy Devices Research Center Shanghai Jiao Tong University

Polymorphism has been frequently used in tuning the singlet emissions of pure organic dyes. The modulation of triplet-involved emissions, particularly room temperature phosphorescence(RTP),however, is scarcely reported. Herein, polymorphism is reported to tune the triplet-involved emissions of 2 CZBZL, a newly designed pure organic luminogen consisting of twisted benzil and two planar carbazole moieties. Other than the conventional modulation through changing molecular conformation and packing, vibration can also finely tune the triplet-involved emissions. Besides prompt fluorescence(PF),polymorph B with relatively extended conformation emits thermally activated delayed fluorescence(TADF), whereas the others(A, C–E) with similarly more twisted conformations generate predominant RTP or simultaneous DF and RTP. These results demonstrate the fascinating chance to regulate the tripletinvolved emissions through controlling conformation and vibration.

关键词： Polymorphism Room temperature phosphorescence Pure organic luminogens Thermally activated delayed fluorescence Triplet-involved emissions

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