检索结果-南通市图书馆

Tunable order in colloids of hard magnetic hexaferrite nanoplatelets

Nano Research 2022年第2期15卷 898-906页

作者： Artem A.Eliseev Lev A.Trusov evgeny o.anokhin Andrei P.Chumakov Vladimir V.Korolev Anastasia E.Sleptsova Peter Boesecke Vladimir Ya.Shur Vladimir YaShur Pavel E.Kazin Andrei A.Eliseev Faculty of Chemistry Moscow State UniversityLeninskie Gory lb3Moscow 119991Russia Department of Materials Science MSU-BIT UniversityShenzhen 517182China Faculty of Materials Science Moscow State UniversityLeninskie Gory lb73Moscow 119991Russia European Synchrotron Radiation Facility Avenue des Martyrs 71Grenoble 38043France School of Natural Sciences and Mathematics Ural Federal UniversityLenin Ave 51Ekaterinburg 620000Russia

Structural ordering in the concentrated magnetic colloids containing 50×5 nm hard magnetic disc-like SrFe_(12)o_(19) nanoparticles was investigated by cryogenic scanning electron microscopy,optical microscopy,magnetic measurements,and small-angle X-ray *** was revealed that macroscopically homogeneous magnetic liquid consists of dynamic threads of stacked *** threads align into quasiperiodic arrays with the distances between individual threads of a few *** also can form pseudodomain structures with -90°domain boundaries realized through T-type thread *** effects of magnetic attraction and electrostatic repulsion on the equilibrium interplatelet distance in the threads were *** was demonstrated that this distance can be tuned by the control of the particles charge and electric double layer screening from Stern layer thickness(-1 nm)to tens of *** was shown that the permanent magnetic field is not able to cause any structural changes in the ordered magnetic liquid phase,while alternating field draws particles apart by their *** variation of interparticle distance up to 6%was achieved using an alternating magnetic field of low *** data were complemented by the theoretical models of screened electrostatic interactions between spherical and platelike magnetic *** last model provides good predictive power and correlates with the experimental *** stabilization energy of the condensed phase in the order of 1-10 kBT was derived from the *** approach allows controlling of an equilibrium interparticle distance and interparticle distance distribution by adjusting the magnetization and surface charge of the particles as well as the ionic strength of the solvent.

关键词： hexaferrite ferrofluid self-assembly colloidal solution

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Light-stimulated adaptive artificial synapse based on nanocrystalline metal-oxide film

引用

opto-Electronic Science 2023年第10期2卷 1-11页

作者： Igor S.Balashov Alexander A.Chezhegov Artem S.Chizhov Andrey A.Grunin Konstantin V.anokhin Andrey A.Fedyanin Faculty of Physics Lomonosov Moscow State UniversityMoscow 119991Russia Faculty of Chemistry Lomonosov Moscow State UniversityMoscow 119991Russia Institute for Advanced Brain Studies Lomonosov Moscow State UniversityMoscow 119991Russia P.K.anokhin Research Institute of Normal Physiology Moscow 125315Russia.

Artificial synapses utilizing spike signals are essential elements of new generation brain-inspired *** this paper,we realize light-stimulated adaptive artificial synapse based on nanocrystalline zinc oxide *** artificial synapse photoconductivity shows spike-type signal response,long and short-term memory(LTM and STM),STM-to-LTM transition and paired-pulse *** is also retaining the memory of previous exposures and demonstrates spike-frequency adaptation properties.A way to implement neurons with synaptic depression,tonic excitation,and delayed accelerating types of response under the influence of repetitive light signals is *** developed artificial synapse is able to become a key element of neuromorphic chips and neuromorphic sensorics systems.

关键词： neuromorphic photonics synaptic adaptation spiking neuron neuromorphic computing optoelectronic synaptic devises nanocrystalline metal-oxide film

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Revealing True and False Brain States Based on Wavelet Analysis of Electroencephalogram

引用

Neuroscience & Medicine 2022年第2期13卷 61-69页

作者： evgeny Antonovich Yumatov Elena Nikolaevna Dudnik oleg Stanislavovich Glazachev Anna Igorevna Filipchenko Sergey Sergeevich Pertsov P. K. anokhin Scientific Research Institute of Normal Physiology Moscow Russia I. M. Sechenov First Moscow State Medical University Moscow Russia

Statement of the Problem: As you know, there exist two different states in the brain’s mental activity: true and false. In recent years, a progressive method of wavelet transformation of the electroencephalogram (EEG) has been developed, which enabled us to establish the fundamental possibility of direct objective registration of the human brain’s mental activity. Earlier, we created an experimental model and software for recognizing true and false mental responses of a person based on the EEG wavelet transformation and described it in the article. The developed experimental model and information software made it possible to compare the two mental states of brain activity by electroencephalographic indicators, one of which is false and the other is true. The goal is to develop a fundamentally new information technology for recognizing true and false states in the brain’s mental activity based on the wavelet transformation of the electroencephalogram. Results: It was revealed that the true and false states of the brain can be distinguished using the method of continuous wavelet transformation and calculation of the EEG wavelet energy. It is shown that the main differences between true and false mental responses are observed in the delta and alpha ranges of the EEG. In the EEG delta rhythm, the wavelet energy is reliably higher in case of a false answer compared to a true one. In the EEG alpha rhythm, the wavelet energy is significantly higher with a true answer than a false one. Practical significance of the research: The data obtained open up the fundamental possibility of identifying true and false mental states of the brain on the basis of continuous wavelet transformation and calculation of the EEG wavelet energy.

关键词： Information Technology Electroencephalogram (EEG) Continuous EEG Wavelet Transformations Mental Activity of the Brain Consciousness Truth and Falsehood

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Design of bounded feedback controls for linear dynamical systems by using common Lyapunov functions

引用

Theoretical & Applied Mechanics Letters 2011年第1期1卷 66-68页

作者： Igor Ananievskii Nickolai anokhin Alexander ovseevich Institute for Problems in Mechanics RAS 101-1Vernadsky Ave.119526 Moscow Russia

For a linear dynamical system,we address the problem of devising a bounded feedback control,which brings the system to the origin in finite *** construction is based on the notion of a common Lyapunov *** is shown tha... 详细信息

关键词： linear control system feedback control bounded control common Lyapunov function

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Derivation of the Gutenberg-Richter empirical formula from the solution of the generalized logistic equation

引用

Natural Science 2012年第8期4卷 648-651页

作者： Lev A. Maslov Vladimir M. anokhin Aims College Greeley CO USA and Computer Center FEBRAS Russia All-Russia Gramberg Research Institute for Geology and Mineral Resources of the ocean (VNIIoKEANGEoLoGIA) St. Petersburg Russia

We have written a new equation to study the statistics of earthquake distributions. We call this equation “the generalized logistic equation”. The Gutenberg-Richter frequency-magnitude formula was derived from the solution of the generalized logistic equation as an asymptotic case for the approximation of large magnitudes. To illustrate how the solution of the generalized logistic equation works, it was used to approximate the observed cumulative distribution of earthquakes in four different geological provinces: the Central Atlantic (40N - 25N, 5W - 35W), Canary Islands, Magellan Mountains (20N - 9S, 148E - 170E), and the Sea of Japan. This approximation showed an excellent correlation between the theoretical curves and observed data for earthquakes of magnitudes 1 < m < 9.

关键词： Gutenberg-Richter Formula Generalized Logistic Equation Earthquakes

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Emotional Stress: The Dialectics of Nature

引用

Neuroscience & Medicine 2020年第1期11卷 20-28页

作者： evgeny Antonovich Yumatov P.K. anokhin Scientific Research Institute of Normal Physiology Moscow Russia

The article considers the biological nature and origins of emotional stress. Emotional stress is primarily formed within the mental activity of the brain in the form of pronounced negative emotions. The “Dynamic Theory of Emo-tions” characterizes the development of a continuous negative emotional state in conflicting behavioral situations when the subject is unable to satisfy its strong dominant need for a long time. The emotional stress is represented as having a dual nature, i.e. a biologically negative pathogenetic effect on health, but a positive impact on the adaptation of individuals, self-preservation of life, and evolutionary change in species.

关键词： Emotions Emotional Stress Psychosomatic Diseases Health Adaptation Evolution

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

The Molecularly Fielding Psychophysical Nature of the Brain Mental Activity

引用

Neuroscience & Medicine 2019年第2期10卷 55-74页

作者： evgeny A. Yumatov P. K. anokhin Research Institute of Normal Physiology Moscow Russia

The brain is a unique organization in nature, having the psychic activity, which is expressed in subjective states: thoughts, feelings, emotions. Knowledge of the nature of mental activity of the brain is the most urgent and the most challenging task of physiology. Historically the neurophysiology developed on the basis of physical and chemical laws discovered in an inanimate nature. our investigation is devoted towards the origin of a human subjective state, and presents a new methodology for studying of the nature psychic brain activity. We have established the existence of physical phenomena unique for the living brain so-called “psychogenic field”, which reflects the expressed psychic state of human brain. The subjective state of a human being was shown to affect remotely the physicochemical properties of the blood. An original schematic diagram is presented to describe the formation of the brain psychic activity. This approach is based on the feedback influence of a psychogenic field on neuronal molecular processes (self-induction in the brain). We propose a paradigm for the origin of psychic state and possible existence of the fields, which are unique for the brain. The presented scheme and paradigm of systemic organization of psychic activity of the brain are a prerequisite for the subsequent development of the theory consciousness.

关键词： Mind Consciousness Subjective State Brain Psychophysics Psychogenic Field Quantum Biology

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Clustered c-Fos Activation in Rat Hippocampus at the Acquisition Stage of Appetitive Instrumental Learning

引用

Journal of Behavioral and Brain Science 2015年第3期5卷 69-80页

作者： olga E. Svarnik Yuri I. Alexandrov Konstantin V. anokhin Institute of Psychology Russian Academy of Sciences Moscow Russia Department of Neuroscience National Research Center “Kurchatov Institute” Moscow Russia P. K. anokhin Institute of Normal Physiology Russian Academy of Medical Sciences Moscow Russia

To address the issue of how hippocampal neurons are involved into learning progress, we studied c-Fos expression in rat hippocampal subfields at different stages of appetitive instrumental learning. To model the first stage of learning, we pre-trained animals to approach the lever to obtain the food, and then made this behavior ineffective by not reinforcing it during the last session (“mismatch” group). Another group just acquired lever-pressing behavior at that day (“acquisition” group). Animals of the third group performed this well-trained behavior (“performance” group). The number of Fos-positive neurons in all hippocampal regions of the “mismatch” group animals was higher than in the ones of the home cage control group animals. The number of Fos-positive neurons was increased in CA1 and CA3 areas, but not in the dentate gyrus of both the “acquisition” and “performance” group animals as compared with the control group. We also found segmented c-Fos expression, which was more evident in “acquisition” group animals. Thus, our results suggest that during the first (mismatch) stage of learning hippocampal neurons are activated in an equally distributed manner. The following clustered pattern of activated CA1 neurons during the acquisition stage may reflect specialization of these neurons in respect to the specific lever-pressing behavior.

关键词： Fos Hippocampus Clusters Neuron Learning

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Importance of Monitoring of Emotional Stress and Physiological Functions of Humans during the Night Sleep

引用

Journal of Pharmacy and Pharmacology 2017年第5期5卷 275-281页

作者： evgeny A. Yumatov Sergey S. Pertsov P. K. anokhin Research Institute of Normal Physiology Moscow 125315 Russia A.I. Evdokimov Moscow State Medical Dental University Moscow 127473 Russia

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Possibility for Recognition of Psychic Brain Activity with Continuous Wavelet Analysis of EEG

引用

Journal of Behavioral and Brain Science 2019年第3期9卷 67-77页

作者： evgeny A. Yumatov Alexandr E. Hramov Vadim V. Grubov oleg S. Glazachev Elena N. Dudnik Nikolay A. Karatygin P.K. anokhin Research Institute of Normal Physiology Moscow Russia Yuri Gagarin State Technical University of Saratov Saratov Russia First Moscow State Medical University of the Ministry of Health of the Russian Federation (Sechenov University) Moscow Russia

The brain is a unique organization in nature, possessing the ability for psychic activity, which manifests itself in thoughts, feelings and emotions. In present days, numbers of mathematical methods for analysis of electroencephalogram (EEG) were developed with continuous wavelet transform being one of the most successive approaches for studying of brain activity. This paper is aimed to develop methods for investigation of psychic brain activity with help of continuous wavelet analysis of EEG. Ability of human to realize semantic content of the image presented on the screen was tested. Experiment was accompanied with simultaneous EEG recording, which was held with developed software and PC-based experimental setup. The information capabilities of continuous wavelet transform-based method for EEG analysis were improved for the recognition of specific patterns in human brain activity. Comparative wavelet analysis was carried out for EEG recordings at the moment of awareness of the semantic content of the image and for EEG recordings in the absence of conscious (subjective) perception of the semantic content of the image. Significant differences were shown in the alpha rhythm of EEG for the moments of awareness of the semantic content of the image and for the moments of absence of conscious perception. Continuous wavelet analysis of EEG showed that the alpha rhythm is the main EEG rhythm, which can be used to estimate the presence of subjective perception of the visual image. Significant differences were shown in the alpha rhythm of EEG for the moments of awareness of the semantic content of the image and for the moments of absence of conscious perception. Conducted studies allow to conclude that revealing of brain activity related to visual image awareness is possible through analysis of EEG.

关键词： Brain Psychic Consciousness Electroencephalogram Continuous Wavelet Analysis

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：