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Mechanism of high Li-ion conductivity in poly(vinylene carbonate)-poly(ethylene oxide)cross-linked network based electrolyte revealed by solid-state NMR

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Journal of Energy Chemistry 2024年第6期93卷 377-383,I0010页

作者： Fan Li Tiantian Dong yi ji Lixin Liang Kuizhi Chen Huanrui Zhang Guanglei Cui Guangjin Hou State Key Laboratory of Catalysis Dalian National Laboratory for Clean EnergyCollaborative Innovation Center of Chemistry for Energy MaterialsDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina University of Chinese Academy of Sciences Beijing 100049China Qingdao Industrial Energy Storage Research Institute Qingdao Institute of Bioenergy and Bioprocess TechnologyChinese Academy of SciencesQingdao 266101ShandongChina

Solid polymer electrolytes(SPEs)have become increasingly important in advanced lithium-ion batteries(LIBs)due to their improved safety and mechanical properties compared to organic liquid electrolytes.Cross-linked polymers have the potential to further improve the mechanical property without trading off Li-ion conductivity.In this study,focusing on a recently developed cross-linked SPE,i.e.,the one based on poly(vinylene carbonate)-poly(ethylene oxide)cross-linked network(PVCN),we used solid-state nuclear magnetic resonance(NMR)techniques to investigate the fundamental interaction between the chain segments and Li ions,as well as the lithium-ion motion.By utilizing homonuclear/heteronuclear correlation,CP(cross-polarization)kinetics,and spin-lattice relaxation experiments,etc.,we revealed the structural characteristics and their relations to lithium-ion mobilities.It is found that the network formation prevents poly(ethylene oxide)chains from crystallization,which could create sufficient space for segmental tumbling and Li-ion co nductio n.As such,the mechanical property is greatly improved with even higher Li-ion mobilities compared to the poly(vinylene carbonate)or poly(ethylene oxide)based SPE analogues.

关键词： ssNMR Lithium-ion mobility Cross-link Solid polymer electrolyte

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Repetitive transcranial magnetic stimulation in Alzheimer’s disease:effects on neural and synaptic rehabilitation

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Neural Regeneration Research 2025年第2期20卷 326-342页

作者： yi ji Chaoyi Yang Xuerui Pang yibing Yan Yue Wu Zhi Geng Wenjie Hu Panpan Hu Xingqi Wu Kai Wang Department of Neurology The First Affiliated Hospital of Anhui Medical UniversityHefeiAnhui ProvinceChina Anhui Province Key Laboratory of Cognition and Neuropsychiatric Disorders HefeiAnhui ProvinceChina Collaborative Innovation Center of Neuropsychiatric Disorders and Mental Health HefeiAnhui ProvinceChina Institute of Artificial Intelligence Hefei Comprehensive National Science CenterHefeiAnhui ProvinceChina Department of Psychology and Sleep Medicine The Second Affiliated Hospital of Anhui Medical UniversityHefeiAnhui ProvinceChina

Alzheimer’s disease is a neurodegenerative disease resulting from deficits in synaptic transmission and homeostasis.The Alzheimer’s disease brain tends to be hyperexcitable and hypersynchronized,thereby causing neurodegeneration and ultimately disrupting the operational abilities in daily life,leaving patients incapacitated.Repetitive transcranial magnetic stimulation is a cost-effective,neuro-modulatory technique used for multiple neurological conditions.Over the past two decades,it has been widely used to predict cognitive decline;identify pathophysiological markers;promote neuroplasticity;and assess brain excitability,plasticity,and connectivity.It has also been applied to patients with dementia,because it can yield facilitatory effects on cognition and promote brain recovery after a neurological insult.However,its therapeutic effectiveness at the molecular and synaptic levels has not been elucidated because of a limited number of studies.This study aimed to characterize the neurobiological changes following repetitive transcranial magnetic stimulation treatment,evaluate its effects on synaptic plasticity,and identify the associated mechanisms.This review essentially focuses on changes in the pathology,amyloidogenesis,and clearance pathways,given that amyloid deposition is a major hypothesis in the pathogenesis of Alzheimer’s disease.Apoptotic mechanisms associated with repetitive transcranial magnetic stimulation procedures and different pathways mediating gene transcription,which are closely related to the neural regeneration process,are also highlighted.Finally,we discuss the outcomes of animal studies in which neuroplasticity is modulated and assessed at the structural and functional levels by using repetitive transcranial magnetic stimulation,with the aim to highlight future directions for better clinical translations.

关键词： Alzheimer’s disease amyloid deposition apoptotic mechanisms biomarker neural regeneration neurodegeneration repetitive transcranial magnetic stimulation synaptic plasticity

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Infantile hepatic hemangiomas:looking backwards and forwards

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Precision Clinical Medicine 2022年第1期5卷 34-45页

作者： Xue Gong Yanan Li Kaiying Yang Siyuan Chen yi ji Division of Oncology Department of Pediatric SurgeryWest China Hospital of Sichuan UniversityChengdu 610041China Pediatric Intensive Care Unit Department of Critical Care MedicineWest China Hospital of Sichuan UniversityChengdu 610041China

Infantile hepatic hemangiomas(IHHs)are common benign tumors seen in the liver of infants.IHHs are true infantile hemangiomas(IHs)and have phases of proliferation and involution parallel to those of cutaneous IHs.The definition and classification of IHH are still confusing in the literature.The mechanisms during the pathogenesis of IHH have yet to be discovered.The clinical manifestations of IHH are heterogeneous.Although most IHH lesions are asymptomatic,some lesions can lead to severe complications,such as hypothyroidism,consumptive coagulopathy,and high-output congestive cardiac failure.Consequently,some patients can possibly encounter a fatal clinical condition.The heterogeneity of the lesions and the occurrence of disease-related comorbidities can make the treatment of IHH challenging.Oral propranolol is emerging as an effective systemic approach to IHH with obvious responses in tumor remission and symptom regression.However,the precise clinical characteristics and treatment strategies for patients with severe IHH have not yet beenwell established.Here,we summarize the epidemiology,pathogenicmechanism,clinical manifestations,diagnosis,and treatment of IHH.Recent updates and future perspectives for IHH will also be elaborated.

关键词： infantile hepatic hemangioma angiogenesis vasculogenesis screening endothelial progenitor cells glycolysis consumptive hypothyroidism treatment

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A two-dimensional tetragonal structure of vanadium telluride

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Nano Research 2023年第5期16卷 7749-7755页

作者： Zizhao Liu Ye Tao Zhiqiang Cui yi ji Xuhan Zhou Peigen Li Yunwei Zhang Dingyong Zhong School of Physics Sun Yat-sen UniversityGuangzhou 510275China State Key Laboratory of Optoelectronic Materials and Technologies Sun Yat-sen UniversityGuangzhou 510275China

The family of vanadium chalcogenides with variable stoichiometry and abundant crystallographic structures are promising platforms for realizing exotic emergent phenomena.Here,we report on a novel two-dimensional(2D)tetragonal structure of vanadium telluride(VTe)grown by molecular beam epitaxy.The atomic structures and electronic properties are revealed by scanning tunneling microscopy and first-principles calculations.Different from the hexagonal or trigonal lattices of 2D VTe_(2),the 2D VTe with a V:Te ratio of 1:1 exhibits an uncommon square lattice.Non-zero differential conductivity at the Fermi energy detected by scanning tunneling spectroscopy reveals the metallic feature of VTe.Meanwhile,Friedel oscillations are observed near chiral point defects and domain walls,illustrating the itinerant nature of the electrons close to the Fermi energy.Our firstprinciples structure searches identify a 2D body-centered cubic(bcc)-like structure with a favorable formation energy to be the candidate of the metallic phase of the tetragonal VTe obtained experimentally.Based on our calculations the 2D bcc-like structure possesses a strong 2D antiferromagnetic order.Our work enriches the family of vanadium chalcogenides and provides a possible 2D antiferromagnetic material for fabricating advanced spintronic devices.

关键词： vanadium telluride molecular beam epitaxy scanning tunneling microscopy two-dimensional magnetism first-principles calculation

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战略目标视角下饲料企业人力资源管理的实施路径

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中国饲料 2024年第4期 109-112页

作者：季艺郑州商学院河南郑州451200

饲料企业的各项经济业务活动都需要人的参与和控制,只有保证一定数量和质量的劳动力资源,才能推动饲料企业的正常运营和发展,才能提高饲料企业的经济效益,因此,人力资源成为饲料企业的第一资源。而在战略目标的导向下,人力资源管理需要... 详细信息

饲料企业的各项经济业务活动都需要人的参与和控制,只有保证一定数量和质量的劳动力资源,才能推动饲料企业的正常运营和发展,才能提高饲料企业的经济效益,因此,人力资源成为饲料企业的第一资源。而在战略目标的导向下,人力资源管理需要立足经济业务活动的期望值,为战略目标的顺利达成提供有力的人才支撑。但部分饲料企业的人力资源管理工作存在一定问题,这些问题制约了企业的内部管理成效,需要加以分析,进一步优化人力资源管理的实施路径。

关键词：战略目标饲料企业人力资源管理实施路径

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An Improved Higher-Order Time Integration Algorithm for Structural Dynamics

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Computer Modeling in Engineering & Sciences 2021年第2期126卷 549-575页

作者： yi ji Yufeng Xing Institute of Solid Mechanics Beihang UniversityBeijing100083China Shen Yuan Honors College Beihang UniversityBeijing100083China

Based on the weighted residual method,a single-step time integration algorithm with higher-order accuracy and unconditional stability has been proposed,which is superior to the second-order accurate algorithms in tracking long-term dynamics.For improving such a higher-order accurate algorithm,this paper proposes a two sub-step higher-order algorithm with unconditional stability and controllable dissipation.In the proposed algorithm,a time step interval[t_(k),t_(k)+h]where h stands for the size of a time step is divided into two sub-steps[t_(k),t_(k)+γh]and[t_(k)+γh,t_(k)+h].A non-dissipative fourth-order algorithm is used in the rst sub-step to ensure low-frequency accuracy and a dissipative third-order algorithm is employed in the second sub-step to lter out the contribution of high-frequency modes.Besides,two approaches are used to design the algorithm parameterγ.The rst approach determinesγby maximizing low-frequency accuracy and the other determinesγfor quickly damping out highfrequency modes.The present algorithm usesρ_(∞)to exactly control the degree of numerical dissipation,and it is third-order accurate when 0≤ρ_(∞)<1 and fourth-order accurate whenρ_(∞)=1.Furthermore,the proposed algorithm is self-starting and easy to implement.Some illustrative linear and nonlinear examples are solved to check the performances of the proposed two sub-step higher-order algorithm.

关键词： Time integration algorithm two-sub-step higher-order accuracy controllable dissipation unconditional stability

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基于单-多视图优化的足球球员三维姿态和体型估计

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计算机工程 2024年第3期50卷 200-207页

作者：谢欢刘纯平季怡苏州大学计算机科学与技术学院江苏苏州215006

足球比赛场景的三维重建有助于观众自由切换视角,增加了互动性和沉浸感。针对足球比赛场景中的足球球员,提出一种三维姿态和体型估计方法。对球员的多视图图像使用训练好的部分注意力回归的三维人体估计(PARE)模型生成初始的三维姿态和... 详细信息

足球比赛场景的三维重建有助于观众自由切换视角,增加了互动性和沉浸感。针对足球比赛场景中的足球球员,提出一种三维姿态和体型估计方法。对球员的多视图图像使用训练好的部分注意力回归的三维人体估计(PARE)模型生成初始的三维姿态和体型估计,并使用人工标注的二维关节点作为优化目标。单-多视图优化操作利用蒙皮多人线性模型(SMPL)和正交投影的可微性,将球员的三维姿态和体型参数映射到二维关节点,计算其与人工标注之间的差异,再使用神经网络的反向传播算法更新三维姿态和体型参数,持续这些过程直到差异最小化。在自建的足球球员多视图数据集上的实验结果表明,该方法能够有效估计足球球员的三维姿态和体型,与人体网格恢复、在循环中优化SMPL、PARE等方法相比,二维关节点精度在单视图上提高了9.2%~37.5%,在多视图交叉验证中提高了34.9%~54.1%。

关键词：三维姿态和体型估计参数化人体模型单-多视图优化反向传播蒙皮多人线性模型

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Evidence for charge and spin density waves in single crystals of La_(3)Ni_(2)O_(7) and La_(3)Ni_(2)O_(6)

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Science China(Physics,Mechanics & Astronomy) 2023年第1期66卷 164-170页

作者： Zengjia Liu Hualei Sun Mengwu Huo Xiaoyan Ma yi ji Enkui yi Lisi Li Hui Liu jia Yu Ziyou Zhang Zhiqiang Chen Feixiang Liang Hongliang Dong Hanjie Guo Dingyong Zhong Bing Shen Shiliang Li Meng Wang Center for Neutron Science and Technology Guangdong Provincial Key Laboratory of Magnetoelectric Physics and DevicesSchool of PhysicsSun Yat-sen UniversityGuangzhou 510275China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Center for High Pressure Science and Technology Advanced Research Shanghai 201203China Songshan Lake Materials Laboratory Dongguan 523808China

Charge and spin orders are intimately related to superconductivity in copper oxide superconductors.Elucidation of the competing orders in various nickel oxide compounds is crucial,given the fact that superconductivity has been discovered in Nd_(0.8)Sr_(0.2)NiO_(2)films.Herein,we report structural,electronic transport,magnetic,and thermodynamic characterizations of single crystals of La_(3)Ni_(2)O_(7)and La_(3)Ni_(2)O_(6).La_(3)Ni_(2)O_(7)is metallic with mixed Ni^(2+)and Ni^(3+)valent states.Resistivity measurements yield two transition-like kinks at~110 and 153 K.The kink at 153 K is further revealed from magnetization and specific heat measurements,indicative of the formation of charge and spin density waves.La_(3)Ni_(2)O_(6)single crystals obtained from the topochemical reduction of La_(3)Ni_(2)O_(7)are insulating and show an anomaly at~176 K on magnetic susceptibility.The transition-like behaviors of La_(3)Ni_(2)O_(7)and La_(3)Ni_(2)O_(6)are analogous to those observed in La_(4)Ni_(3)O_(10) and La_(4)Ni_(3)O_(8),suggesting that charge and spin density waves are a common feature in the ternary La-Ni-O system with mixed-valent states of nickel.

关键词： charge-density-wave systems spin-density waves mixed-valence solids superlattices crystal growth

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学习体验视角下中外高质量在线开放课程比较研究

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现代教育技术 2024年第2期34卷 81-89页

作者：肖婉季一木南京邮电大学教育科学与技术学院江苏南京210023 南京邮电大学计算机学院江苏南京210023

在教育数字化转型背景下,高质量在线开放课程建设对于促进在线教育优质发展、推动高等教育强国建设具有重要意义。然而,当前在线开放课程质量参差不齐,导致实践应用中存在课程完成率低、学生参与度低、学习体验差等问题,亟须重视在线开... 详细信息

在教育数字化转型背景下,高质量在线开放课程建设对于促进在线教育优质发展、推动高等教育强国建设具有重要意义。然而,当前在线开放课程质量参差不齐,导致实践应用中存在课程完成率低、学生参与度低、学习体验差等问题,亟须重视在线开放课程质量研究,以提升学习效果和学习体验。为了解国内和国际高质量在线开放课程的特点,文章基于学习体验视角,首先对20门高质量在线开放课程评论进行文本挖掘,揭示其学习体验的八大构成要素;然后文章从感官体验、内容体验、情感体验和价值体验四个维度对其进行整体比较,并从素质类课程、基础类课程、专业类课程三个方面对其内容体验与体感体验进行了特色分析。文章通过多维度及多层次比较研究,从学习体验视角揭示了中外高质量在线开放课程的共性和差异,以期为我国在线课程的质量提升和国际化传播提供实证参考。

关键词：学习体验高质量在线开放课程 MOOC

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考虑应力梯度的缺口疲劳分散性研究

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塑性工程学报 2024年第1期31卷 223-230页

作者：郑战光谢羿吉孙腾谢昌吉黄增广西大学机械工程学院广西高校现代设计与先进制造重点实验室广西南宁530004 北部湾大学机械与船舶海洋工程学院广西钦州535011 广西机电职业技术学院机械工程学院广西南宁530007

针对缺口部位的微观结构及尺寸导致的疲劳分散差异较大的问题,为准确预测缺口件的疲劳分散性,以矩形截面缺口件为例,采用宏观Chaboche循环塑性本构模型与细观晶体循环塑性本构模型相结合的有限元子模型方法,并考虑缺口效应,提出了以应... 详细信息

针对缺口部位的微观结构及尺寸导致的疲劳分散差异较大的问题,为准确预测缺口件的疲劳分散性,以矩形截面缺口件为例,采用宏观Chaboche循环塑性本构模型与细观晶体循环塑性本构模型相结合的有限元子模型方法,并考虑缺口效应,提出了以应力梯度影响因子、等效应力与纵向应变为变量的统计标准差作为疲劳指示因子FIP_(notch)。在不同位移载荷、位移载荷比和缺口直径大小情况下将疲劳指示因子FIP_(notch)与经典的Fatemi-Socie疲劳指示因子FIP FS进行疲劳分散性的比较与分析。结果表明:疲劳指示因子FIP_(notch)均能很好地预测不同位移载荷、位移载荷比和缺口直径下的缺口疲劳分散性,且比经典的FIP FS方法有更高的精度与适用性。

关键词：疲劳分散性晶体塑性裂纹萌生驱动力疲劳指示因子

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