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Some Characteristics of Neurons in the Reticular Nucleus of the Thalamus (Preliminary Data)

Journal of Behavioral and Brain Science 2023年第3期13卷 45-54页

作者： Zakaria I. Nanobashvili Irine G. Bilanishvili Irine G. Vashakidze Maia G. Barbakadze Megi G. Dumbadze Nadejda A. Khizanishvili Laboratory of Neurophysiology Ivane Beritashvili Center of Experimental Biomedicine Tbilisi Georgia Georgian National University - SEU Tbilisi Georgia Teaching university Geomedi Tbilisi Georgia

Our general understanding of the function of neurons is that dendrites receive information that is relayed to the axon, where action potentials are initiated and propagated to eventually trigger neurotransmitter release at synaptic terminals. Although for a number of neuron types in the mammalian brain, many neuron types do not follow this classical polarity pattern. In fact, dendrites may be the site of action potentials initiation and propagation. It should be noted that convincing evidence has been obtained for the existence of dendritic action potentials in hippocampal and neocortical neurons. With regard to the dendrite potentials of thalamic neurons in general and specifically the reticular nucleus of the thalamus, it has not yet been reported. The results of this study demonstrate, for the first time, that generation of spike potentials of different amplitudes was observed in the activity of the thalamic reticular nucleus neurons. The generation of one action potential does not interfere with the generation of another, and a spike potential of smaller amplitude can occur at the ascending or descending phase of the spike potential of large amplitude. It can be argued that the spike potentials of lower amplitudes arising in the thalamic reticular nucleus neuron are of dendrite origin. Given both the strategic position and the functional purpose of the TRN, it can be assumed that the neurons of this structure must each time be discharged with spike potentials in order to carry out their modulating effect on other areas of the nervous system of the brain without leakage.

关键词： Thalamus Neuron Dendrite Potentials Cat

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In situ atomic-scale tracking of unusual interface reaction circulation and phase reversibility in(de)potassiated alloy-typed anode

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Journal of Energy Chemistry 2024年第8期95卷 241-249页

作者： Lin Su Ruining Fu Shuangying Lei Yuchen Pan Chongyang Zhu Pengcheng Liu Feng Xu seu-FEI Nano-Pico Center Southeast university Key Laboratory of MEMS of the Ministry of Education

Alloy-typed anode materials,endowed innately with high theoretical specific capacity,hold great promise as an alternative to intercalation-typed counterparts for alkali-ion batteries.Despite tremendous efforts devoted to addressing drastic volume change and severe pulverization issues of such anodes,the underlying mechanisms involving dynamic phase evolutions and reaction kinetics have not yet been fully comprehended.Herein,taking antimony(Sb) anode as a representative paradigm,its microscopic operating mechanisms down to the atomic scale during live(de)potassiation cycling are systematically unraveled using in situ transmission electron microscopy.Highly reversible phase transformations at single-particle level,that are Sb■KSb2■KSb■K5Sb4■K3Sb,were revealed during cycling.Meanwhile,multiple phase interfaces associated with different reaction kinetics coexisted and this phenomenon was properly elucidated in the context of density functional theory calculations.Impressively,previously unexplored unidirectional circulation of reaction interfaces within individual Sb particle is confirmed for both potassiation and depotassiation.Based on the empirical results,the surface diffusion-mediated potassiation-depotassiation pathways at single-particle level are suggested.This work affords new insights into energy storage mechanisms of Sb anode and valuable guidance for targeted optimization of alloy-typed anodes(not limited to Sb) toward advanced potassium-ion batteries.

关键词： Alloy-typed anode In situ transmission electron microscopy Potassium storage mechanism Reaction interface

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Pinning Synchronization of Coupled Oscillators with Paired Topologies

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Journal of Systems Science & Complexity 2022年第5期35卷 1653-1667页

作者： ZHANG Miaosen LU Yuezu WANG Qishao WEN Guanghui LIU Guohua XU Wenying Chien-Shiung Wu College of seu Southeast UniversityNanjing 211189China School of Mathematics Southeast UniversityNanjing 211189China Department of Dynamics and Control Beihang UniversityBeijing 100871China

This paper investigates the pinning synchronization of a group of coupled oscillators,where both the dissipative and restorative interactions are taken into consideration.The paired coupling topologies are introduced to capture this feature of the dynamics.To realize the synchronization of the coupled oscillators,the pinning control is introduced,and two pinning criteria are proposed to ensure the synchronization.Both these two proposed criteria provide sufficient and necessary conditions for pinning synchronization of the coupled oscillators with paired topologies.Simulation examples are illustrated to verify the proposed theoretical results.

关键词： Paired coupling topologies pinning control synchronization

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In situ investigation of the mechanical properties of nanomaterials by transmission electron microscopy

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Acta Mechanica Sinica 2012年第6期28卷 1513-1527页

作者： Jun Sun Feng Xu Li-Tao Sun seu-FEI Nano-Pico Center Key Laboratory of MEMS of Ministry of Education Southeast University

With the progress of modern transmission elec- tron microscopy （TEM） and development of dedicated func- tional TEM specimen holders, people can now manipulate a nano-object with nanometer-range precision and simulta- neously acquire mechanical data together with atomic-scale structural information. This advanced methodology is play- ing an increasingly important role in nanomechanics. The present review summarizes relevant studies on the in situ in- vestigation of mechanical properties of various nanomateri- als over the past decades. These works enrich our knowledge not only on nanomaterials （such as carbon nanotubes, car- bon onions, boron nitride nanotubes, silicon nanowires and graphene, etc.） but also on mechanics at the nanoscate.

关键词： Nanomaterials Transmission electron mi-croscopy In situ Nanoscale mechanics

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Surface-Condition-Dependent Deformation Mechanisms in Lead Nanocrystals

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Research 2022年第4期2022卷 589-595页

作者： Hongtao Zhangg Wen Wang Jun Sun Li Zhong Longbing He Litao Sun seu-FEI Nano-Pico Center Key Laboratory of MEMS of Ministry of EducationSoutheast UniversityNanjing 210096China Center for Advanced Materials and Manufacture Southeast University-Monash University Joint Research InstituteSuzhou215123China

Serving as nanoelectrodes or frame units,small-volume metals may critically affect the performance and reliability of nanodevices,especially with feature sizes down to the nanometer scale.Small-volume metals usually behave extraordinarily in comparison with their bulk counterparts,but the knowledge of how their sizes and surfaces give rise to their extraordinary properties is currently insufficient.In this study,we investigate the influence of surface conditions on mechanical behaviors in nanometer-sized Pb crystals by performing in situ mechanical deformation tests inside an aberration-corrected transmission electron microscope(TEM).Pseudoelastic deformation and plastic deformation processes were observed at atomic precision during deformation of pristine and surface-oxidized Pb particles,respectively.It is found that in most of the pristine Pb particles,surface atom diffusion dominates and leads to a pseudoelastic deformation behavior.In stark contrast,in surface-passivated Pb particles where surface atom diffusion is largely inhibited,deformation proceeds via displacive plasticity including dislocations,stacking faults,and twinning,leading to dominant plastic deformation without any pseudoelasticity.This research directly reveals the dramatic impact of surface conditions on the deformation mechanisms and mechanical behaviors of metallic nanocrystals,which provides significant implications for property tuning of the critical components in advanced nanodevices.

关键词： deformation sizes diffusion

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Thermal stability of Te nanowires and their crystallographydetermined surface evolution at elevated temperatures

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Nano Research 2023年第4期16卷 5695-5701页

作者： Lei Shangguan Yating Ran Ziyu Lu Yutian Gao Lei Shi Longbing He Litao Sun seu-FEI Nano-Pico Center Key Laboratory of MEMS of Ministry of EducationSoutheast UniversityNanjing 210096China Centre for Advanced Materials and Manufacture Joint Research Institute of Southeast University and Monash UniversitySuzhou 215123China

Nanowires are fantastic nanostructures for designing new functional devices because of their extraordinary properties.However,nanowires usually suffer pronounced size and surface effects with decreasing diameter size.Whether their structure and thermal stability can still fill the requirements of practical applications is a critical issue to be figured out.Herein,Te nanowires with diameters ranging from sub-10 to over 80 nm are used as samples to probe into this issue.In situ heating experiments are performed on these Te nanowires using an aberration-corrected transmission electron microscopy combined with a chip-based heating holder.It is found that Te nanowires suffer sublimation at elevated temperatures rather than melting,showing sizedependent sublimation scenarios.The Te nanowires with diameter smaller than 20 nm sublimate below 205℃,while the larger ones with diameter around 85 nm require a higher temperature of around 225℃.During sublimation-induced shape evolution,the interfacial wetting equilibrium and crystal orientations play critical roles,leading to the formation of spherical surfaces or featured facets at the free surfaces.A mean contact angle of 107.5°is determined at the C-Te interface when the crystalline Te nanowires stay in a quasi-liquid equilibrium state.However,once the crystalline feature is overwhelming,e.g.,at moderate temperatures,the(1011),(1120),and(1010)facets govern the free surface,despite the wetting condition at the interfaces.

关键词： Te nanowires in situ transmission electron microscopy thermal stability surface evolution

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二维超导η-Mo3C2薄膜的可控制备

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Science China Materials 2021年第3期64卷 664-672页

作者：石威于郡尧徐涛刘伟林黄贤雷徐洁孙立涛高力波 national Laboratory of Solid State Microstructures School of PhysicsCollaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing210093China seu-FEI Nano-Pico Center Key Laboratory of MEMS of Ministry of EducationSchool of Electronic Science and EngineeringSoutheast UniversityNanjing210096China

二维超导体具有丰富的物理特性和非常广泛的潜在应用.最近,有报道制备出具有二维超导特性的α-Mo2C和面心立方Mo2C,这些材料为碳基超导的研究带来了新的方向.碳化钼具有多种晶体结构,除了目前已经被制备的种类外,二维碳化钼尚没有新的... 详细信息

二维超导体具有丰富的物理特性和非常广泛的潜在应用.最近,有报道制备出具有二维超导特性的α-Mo2C和面心立方Mo2C,这些材料为碳基超导的研究带来了新的方向.碳化钼具有多种晶体结构,除了目前已经被制备的种类外,二维碳化钼尚没有新的晶体结构被制备出来,这或许是因为在制备过程中缺乏额外的能量供给.在本工作中,我们进一步发展了两步气相沉积法,通过有效调控等离子体作为外加能量供给,成功制备出具有不同厚度和超导特性的二维η-Mo3C2薄膜.虽然这种方法生长出的η-Mo3C2薄膜是多晶,但这些薄膜仍然可以表现出良好的超导特性.其中,3.0 nm厚的薄膜具有5.38 K的超导转变温度,而且其电学性能很好地与二维超导特性吻合.这项工作不仅证明了二维η-Mo3C2薄膜具有稳定和良好的超导特性,而且还提供了一种更为便捷的生长方法,这将进一步促进更多基于二维碳化物异质结构的应用性器件的便捷制备.

关键词：超导转变温度晶体结构超导特性面心立方气相沉积法碳化钼异质结构 Mo2C

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Aligning Fe_(2)O_(3)photo-sheets on TiO_(2)nanofibers with hydrophilic and aerophobic surface for boosting photoelectrochemical performance

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Nano Research 2023年第3期16卷 4178-4187页

作者： Xiangyu Meng Qi Zhan Yanan Wu Mengmeng Zhu Ken Liu Na Wang Kuibo Yin Yueming Sun Shuai Dong Yunqian Dai School of Chemistry and Chemical Engineering Southeast UniversityNanjing 211189China School of Physics Southeast UniversityNanjing 211189China seu-FEI Nano-Pico Center Key Laboratory of MEMS of Ministry of EducationSoutheast UniversityNanjing 210096China

Photoelectrochemical(PEC)nanomaterials are critical to producing clean oxygenation or value-added chemical production by utilizing sustainable solar energy,but are always limited by simultaneous integration of architectural engineering and electronic regulation in one structure.Directed by density functional theory(DFT)calculations and finite element analysis(FEA),the bioinspired ivy-like Fe_(2)O_(3)heterostructures with enriched oxygen defects on TiO_(2)nanofibers are designed for boosting PEC performances.Ivy-like Fe_(2)O_(3)photo-sheets remarkably enhanced the light harvesting by multiple light-mater interactions.The oxygen vacancies on Fe_(2)O_(3)photo-sheets could aid the photons catching and promote the reactivity at active sites.More importantly,demonstrated by a well-designed dynamic observation,the abundant tip-edges within ivy-like Fe_(2)O_(3)photo-sheets enabled the surface of heterostructure with hydrophilic and aerophobic properties.The functionalized surface allowed the rapid desorption of produced bubbles and thus ensured a high density of unoccupied active sites for electrolyte accessing.Featured by these attributes,the Fe_(2)O_(3)@TiO_(2)nanofibers delivered an excellent photocurrent of 40.8 mA/mg,high donor density(1.2×10^(18)cm^(−3)),and rapid oxygen production rate(1 mmol/(L∙h)).This work demonstrates a new strategy on nano-structural design for enhancing light-harvesting and making a hydrophilic/aerophobic surface on low-dimensional oxide nanomaterial,holding great potential on designing high-performance PEC devices for producing survival source gas,carbon-neutral fuel,and valuedchemicals.

关键词： electrospinning nanofibers TiO2 Fe2O3 light harvesting photoelectrochemical

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Anisotropic metal–insulator transition in strained VO_(2)(B) single crystal

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Chinese Physics B 2024年第6期33卷 56-61页

作者：马泽成闫胜楠刘增霖徐涛陈繁强陈思成曹天俊孙立涛程斌梁世军缪峰 Institute of Brain-Inspired Intelligence National Laboratory of Solid State MicrostructuresSchool of PhysicsCollaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China seu-FEI Nano-Pico Center Key Laboratory of MEMS of Ministry of EducationSoutheast UniversityNanjing 210096China Institute of Interdisciplinary of Physical Sciences School of ScienceNanjing University of Science and TechnologyNanjing 210094China

Mechanical strain can induce noteworthy structural and electronic changes in vanadium dioxide, imparting substantial scientific importance to both the exploration of phase transitions and the development of potential technological applications. Unlike the traditional rutile(R) phase, bronze-phase vanadium dioxide [VO_(2)(B)] exhibits an in-plane anisotropic structure. When subjected to stretching along distinct crystallographic axes, VO_(2)(B) may further manifest the axial dependence in lattice–electron interactions, which is beneficial for gaining insights into the anisotropy of electronic transport.Here, we report an anisotropic room-temperature metal–insulator transition in single-crystal VO_(2)(B) by applying in-situ uniaxial tensile strain. This material exhibits significantly different electromechanical responses along two anisotropic axes.We reveal that such an anisotropic electromechanical response mainly arises from the preferential arrangement of a straininduced unidirectional stripe state in the conductive channel. This insulating stripe state could be attributed to the in-plane dimerization within the distorted zigzag chains of vanadium atoms, evidenced by strain-modulated Raman spectra. Our work may open up a promising avenue for exploiting the anisotropy of metal–insulator transition in vanadium dioxide for potential technological applications.

关键词： vanadium dioxide strain anisotropy electrical transport

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Gold nanorod translocation through a solid-state nanopore

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Chinese Science Bulletin 2014年第7期59卷 598-605页

作者： Liping Liu Jinglin Kong Xiao Xie Hongwen Wu Xiaofeng Ye Zhiliang Zhao Lei Wang Quanjun Liu State Key Laboratory of Bioelectronics Southeast University seu-FEI Nano-Pico Center Key Laboratory of MEMS of Ministry of Education Southeast University

Recently,nanopores have been used in an essential technique for detecting single molecule with high sensitivity.The initial application of nanopores to DNA and RNA sequencing has been expanded to sensing proteins and nanoparticles,including Bovine serum albumin,silica nanoparticles,polystyrene beads,and others.In our study,for the first time,a positively charged gold nanorod was investigated using a solid-state nanopore device.Various gold nanorods passed through the nanopore with different current blockages and duration times,providing a measurement of the nanorod diameter,length,and charge.Our findings indicate that nanopore sensing might be a new method for characterizing the size,shape,and charge of nanoparticles.

关键词：纳米孔纳米棒固态硅纳米颗粒易位金牛血清白蛋白正电荷

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