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On the functions of astrocyte-mediated neuronal slow inward currents

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Neural Regeneration Research 2024年第12期19卷 2602-2612页

作者： Balázs Pál Department of Physiology Faculty of MedicineUniversity of DebrecenDebrecenHungary

Slow inward currents are known as neuronal excitatory currents mediated by glutamate release and activation of neuronal extra synaptic N-met hyl-D-aspartate receptors with the contribution of *** events are significantly slower than the excitatory postsynaptic *** of slow inward currents are determined by seve ral factors including the mechanisms of astrocytic activation and glutamate release,as well as the diffusion pathways from the release site towards the extra synaptic recepto *** are stimulated by neuronal network activity,which in turn excite neurons,forming an astrocyte-neuron feedback *** as a consequence of brain edema,astrocytic swelling can also induce slow inward currents under pathological *** is a growing body of evidence on the roles of slow inward currents on a single neuron or local network *** events often occur in synchro ny on neurons located in the same astrocytic *** synchronization of neuronal excitability,slow inward currents also set synaptic strength via eliciting timing-dependent synaptic *** addition,slow inward currents are also subject to non-synaptic plasticity triggered by long-la sting stimulation of the excitatory *** note,there might be important regionspecific differences in the roles and actions triggering slow inward *** greater networks,the pathophysiological roles of slow inward currents can be better understood than physiological *** inward currents are identified in the pathophysiological background of autism,as slow inward currents drive early hypersynchrony of the neural *** inward currents are significant contributors to paroxysmal depolarizational shifts/interictal *** events are related to epilepsy,but also found in Alzheimer's disease,Parkinson's disease,and stroke,leading to the decline of cognitive *** with features overlapping with slow inward currents(excitatory,N-methyl-Dasp

关键词： astrocyte cortical spreading depolarization gliotransmission glutamate neural synchronization NMDA receptor paroxysmal depolarizational shift slow inward current

Research on Avatar-like robot design based on virtual museum scene

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The Journal of China Universities of Posts and Telecommunications 2022年第2期29卷 43-51页

作者： lü Desheng Tang Qinyi School of Architecture Harbin Institute of TechnologyHarbin 150006China Key laboratory of Interactive Media Design and Equipment Service Innovation of Ministry of Culture and Tourism Harbin Institute of TechnologyHarbin 150006China

An Avatar-like robot in a virtual museum environment was designed to perform the function of telepresence and teleoperation,and make the three-dimensional(3 D) effect through a binocular camera and a virtual reality(VR) head-mounted display(HMD).This robot supports users to participate in the exhibition remotely in a new and interactive way in multiple *** results show that the system has good usability and is worth further optimizing.

关键词： Avatar-like robots social robots teleoperation virtual reality(VR) online tour museum visit

On calculating glacial isostatic adjustment

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Geodesy and Geodynamics 2024年第5期15卷 441-452页

作者： l.M.Cathles Cornell University IthacaNY 14853USA

Modeling the earth's fluid and elastic response to the melting of the glaciers of the last ice age is the most direct way to infer the earth's radial viscosity ***,we compare two methods for calculating the viscoelastic response to surface *** one,the elastic equation of motion is converted to a viscoelastic equation using the Correspondence *** the other,elastic deformation is added to the viscous flow as isostatic adjustment *** two modeling methods predict adjustment histories that are different enough to potentially impact the interpretation of the observed glacial isostatic adjustment(GIA).The differences arise from buoyancy and whether fluid displacements are subjected to hydrostatic *** methods agree if they use the same equations and boundary *** origin of the differences is determined by varying the boundary conditions and pre-stress application.

关键词： Glacial isostatic adjustment Viscoelastic normal modes Hydrostatic pre-stress Elastic buoyancy Correspondence principle

Image label transfer: Short video labelling by using frame auto-encoder

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The Journal of China Universities of Posts and Telecommunications 2020年第1期27卷 92-99页

作者： lü Chaohui Huang Yiyang School of Information and Communication Engineering Communication University of ChinaBeijing 100024China Beijing Key laboratory of Modern Entertainment Technology Communication University of ChinaBeijing 100024China Key laboratory of Acoustic Visual Technology and Intelligent Control System Ministry of Culture and TourismBeijing 100024China

Short videos on the Internet have a huge amount, but most of them are unlabeled. In this paper, a rough short video labelling method based on the image classification neural network is proposed. Convolutional auto-encoder is applied to train and learn unlabeled video frames, in order to obtain feature in the specific level. With these features, the video key-frames are extracted by the feature clustering method. These key-frames which represent the video content are put into an image classification network, so that the labels of every video clip can be got. In addition, the different architectures of convolutional auto-encoder are estimated, and a better performance architecture through the experiment result is selected. In the final experiment, the video frame features from the convolutional auto-encoder are compared with those from other extraction methods, where it illustrates remarkable results by the proposed method.

关键词： image feature video labelling convolutional neural network auto-encoder cluster key-frame

Advances of ferrous and ferric Mossbauer recoilless fractions in minerals and glasses

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Geoscience Frontiers 2022年第2期13卷 78-89页

作者： Hongluo l.Zhang State Key laboratory of Geological Processes and Mineral Resources China University of GeosciencesBeijing 100083China

Mössbauer spectroscopy has been used widely to characterize the ferric(Fe^(3+))and ferrous(Fe^(2+))proportions and coordination of solid *** obtain these accurately,the recoilless fraction is *** recoilless fractions(f)of iron-bearing minerals,including oxides,oxyhydroxides,silicates,carbonates,phosphates and dichalcogenides,and silicate glasses were evaluated from the temperature dependence of their center shifts or absorption area with the Debye model ***,the resolved Debye temperature(θ_(D))of ferric iron in minerals,except dichalcogenides,through their center shifts ranging from 400 to 550 K,is significantly larger than ferrous iron ranging from 300 to 400 K,which is consistent with the conclusion from previous *** resolved f(Fe^(3+))RT with the center shift model(CSM)ranges from 0.825 to 0.925,which is larger than that obtained for f(Fe^(2+))RT,which ranges from 0.675 to ***,the θ_(D) and f resolved from temperature-dependence of absorption are generally lower than from center shifts,especially for ferric *** significant difference between f(Fe^(3+))and f(Fe^(2+))indicates the necessity of recoilless fraction correction on the Fe^(3+)/(Fe^(3+)+Fe^(2+))resolved from Mössbauer spectra.

关键词： Mossbauer spectroscopy Recoilless fraction Debye temperature Oxidation states Iron ratio

Determination of relationships between thermal conductivity and material properties of rocks

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Journal of University of Science and Technology Beijing 2004年第4期11卷 297-301页

作者： Kazim Grgülü Mining Engineering Dept. Cumhuriyet University58140-SivasTurkeynergy transfer between the adjacent parts of rocks in underground mines is widely influenced by the thermal conductivity of rocks. The relationships between the thermal conductivity and some material properties of rocks such as the uniaxial compressive strength unit mass tensile strength cohesion Young's modulus point load strength Schmidt rebound hardness Shore scleroscope hardness and toughness strength were investigated. The statistical analysis of the data obtained in laboratory tests shows that the thermal conductivity increases with increasing the uniaxial compressive strength unit mass tensile strength cohesion Young's modulus point load strength Schmidt rebound hardness and Shore scleroscope hardness and decreases with increasing the toughness strength.

Energy transfer between the adjacent parts of rocks in underground mines is widely influenced by the thermal conductivity of rocks. The relationships between the thermal conductivity and some material properties of rocks such as the uniaxial compressive strength, unit mass, tensile strength, cohesion, Young’s modulus, point load strength, Schmidt rebound hardness, Shore scleroscope hardness and toughness strength were investigated. The statistical analysis of the data obtained in laboratory tests shows that the thermal conductivity increases with increasing the uniaxial compressive strength, unit mass, tensile strength, cohesion, Young’s modulus, point load strength, Schmidt rebound hardness and Shore scleroscope hardness, and decreases with increasing the toughness strength.

关键词： thermal conductivity material properties underground mines

Modeling of the Microstructure Evolution in Continuously Cast Al-pb Alloys

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Journal of Materials Science & Technology 2002年第4期18卷 306-310页

作者： JiuzhouZHAO l.Ratke InstituteofMetalResearch ChineseAcademyofSciencesShenyang110016China InstituteforSpaceSimulation DLRD-51140CologenGermany

A numerical model is presented describing the microstructure evolution of an immiscible alloy under the continuous casting conditions. Calculations are carried out to investigate the microstructure evolution in a vertical strip cast sample of Al+5wt pct Pb alloy. The numerical results show that there exists a peak value for the supersaturation in front of the solid祃iquid interface, and the minority phase droplets are nucleated in a region around this peak. Under strip casting conditions the Marangoni migration dominates the motion of droplets. This leads to an accumulation of the minority phase droplets in front of the solid祃iquid interface.

关键词： Immiscible alloy Continuous casting Microstructure Numerical simulation

Effect of Aging Treatment on Microstructural and Mechanical Characteristics of PEO Coatings on Mg-Al Alloy

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Journal of Materials Science & Technology 2008年第1期24卷 37-40页

作者： Y.l.Kim Department of Materials Engineering Korea Aerospace University Gyeonggi-do412-791Korea

Cast Mg-6 wt pct Al alloy solution-treated at 683 K for 16 h and aged at 498 K was coated by plasma electrolytic oxidation （PEO） *** Mg-6 wt pct Al alloy aged for 16 h exhibited the highest microhardness and wear *** PEO coating,however,the microhardness and wear resistance of coatings on Mg- 6 wt pct Al alloy showed a tendency to decrease with increasing aging time,which was in aggrement with the change of thickness with aging *** addition,the coatings on solution-treated Mg-6 wt pct Al alloy had better microhardness and wear resistance than those on aged Mg-6 wt pct Al ***,it can be understood that the aging treatment has a deleterious influence on the mechanical properties of coatings on Mg-6 wt pct Al alloy.

关键词： Cast Mg-6 wt pct Al Aging treatment Plasma electrolytic oxidation Thickness Microhardness Wear resistance

A Search on the Klein-Gordon Equation

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Chinese Physics letters 2006年第10期23卷 2640-2643页

作者： B.Gonül Department of Engineering Physics University of Gaziantep Gaziantep 27310 Turkey

The s-wave Klein-Gordon equation for the bound states is separated in two parts to see clearly the relativistic contributions to the solution in the non-relativistic limit. The reliability of the model is discussed wi... 详细信息

关键词： ARBITRARY DIMENSIONS POTENTIAlS COUlOMB SCAlAR VECTOR DIRAC