The Random and Fluctuating World最新文献_第2页

Statistics of Fluctuations of Magnetic Monopole Concentration in Spin Ice 自旋冰中磁单极子浓度波动的统计

The Random and Fluctuating World Pub Date : 2017-11-21 DOI: 10.1142/S0219477517500353

A. V. Klyuev, M. Ryzhkin, A. V. Yakimov

引用次数: 11

Memristor Equations: Incomplete Physics and Undefined Passivity/Activity 忆阻器方程:不完全物理和未定义的被动/活性

The Random and Fluctuating World Pub Date : 2017-03-23 DOI: 10.1142/S0219477517710018

K. Sundqvist, D. Ferry, L. Kish

引用次数: 7

Zero Thermal Noise in Resistors at Zero Temperature 零温度下电阻的零热噪声

The Random and Fluctuating World Pub Date : 2016-10-24 DOI: 10.1142/S0219477516400010

L. Kish, G. Niklasson, C. Granqvist

{"title":"Zero Thermal Noise in Resistors at Zero Temperature","authors":"L. Kish, G. Niklasson, C. Granqvist","doi":"10.1142/S0219477516400010","DOIUrl":"https://doi.org/10.1142/S0219477516400010","url":null,"abstract":"The bandwidth of transistors in logic devices approaches the quantum limit, where Johnson noise and associated error rates are supposed to be strongly enhanced. However, the related theory — asserting a temperature-independent quantum zero-point (ZP) contribution to Johnson noise, which dominates the quantum regime — is controversial and resolution of the controversy is essential to determine the real error rate and fundamental energy dissipation limits of logic gates in the quantum limit. The Callen–Welton formula (fluctuation–dissipation theorem) of voltage and current noise for a resistance is the sum of Nyquist’s classical Johnson noise equation and a quantum ZP term with a power density spectrum proportional to frequency and independent of temperature. The classical Johnson–Nyquist formula vanishes at the approach of zero temperature, but the quantum ZP term still predicts non-zero noise voltage and current. Here, we show that this noise cannot be reconciled with the Fermi–Dirac distribution, which defines the thermodynamics of electrons according to quantum-statistical physics. Consequently, Johnson noise must be nil at zero temperature, and non-zero noise found for certain experimental arrangements may be a measurement artifact, such as the one mentioned in Kleen’s uncertainty relation argument.","PeriodicalId":191232,"journal":{"name":"The Random and Fluctuating World","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126627740","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Market Correlation Structure Changes Around the Great Crash: A Random Matrix Theory Analysis of the Chinese Stock Market 大崩盘前后市场相关结构变化:中国股市的随机矩阵理论分析

The Random and Fluctuating World Pub Date : 2016-01-30 DOI: 10.1142/S0219477517500183

Rui-Qi Han, Wen-Jie Xie, Xiong Xiong, Wei Zhang, Wei‐Xing Zhou

{"title":"Market Correlation Structure Changes Around the Great Crash: A Random Matrix Theory Analysis of the Chinese Stock Market","authors":"Rui-Qi Han, Wen-Jie Xie, Xiong Xiong, Wei Zhang, Wei‐Xing Zhou","doi":"10.1142/S0219477517500183","DOIUrl":"https://doi.org/10.1142/S0219477517500183","url":null,"abstract":"We perform a comparative analysis of the Chinese stock market around the occurrence of the 2008 crisis based on the random matrix analysis of high-frequency stock returns of 1228 stocks listed on the Shanghai and Shenzhen stock exchanges. Both raw correlation matrix and partial correlation matrix with respect to the market index in two time periods of one year are investigated. We find that the Chinese stocks have stronger average correlation and partial correlation in 2008 than in 2007 and the average partial correlation is significantly weaker than the average correlation in each period. Accordingly, the largest eigenvalue of the correlation matrix is remarkably greater than that of the partial correlation matrix in each period. Moreover, each largest eigenvalue and its eigenvector reflect an evident market effect, while other deviating eigenvalues do not. We find no evidence that deviating eigenvalues contain industrial sectorial information. Surprisingly, the eigenvectors of the second largest eigenvalues in 2007 and of the third largest eigenvalues in 2008 are able to distinguish the stocks from the two exchanges. We also find that the component magnitudes of the some largest eigenvectors are proportional to the stocks' capitalizations.","PeriodicalId":191232,"journal":{"name":"The Random and Fluctuating World","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122561843","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 22

FAST MEASUREMENT OF HYPERSPACE VECTORS IN NOISE-BASED LOGIC 基于噪声逻辑的超空间向量快速测量

The Random and Fluctuating World Pub Date : 2012-07-11 DOI: 10.1142/S0219477512500010

L. Stachó

引用次数: 4

ITÔ VERSUS STRATONOVICH: 30 YEARS LATER ItÔ vs . stratonovich: 30年后

The Random and Fluctuating World Pub Date : 2012-05-16 DOI: 10.1142/S021947751240010X

R. Mannella, P. McClintock

引用次数: 49

COHERENCE BETWEEN FLUCTUATIONS IN BLOOD FLOW AND OXYGEN SATURATION 血流量和血氧饱和度波动之间的一致性

The Random and Fluctuating World Pub Date : 2012-05-16 DOI: 10.1142/S0219477512400135

A. Bernjak, A. Stefanovska, P. McClintock, P. J. Owen-Lynch, P. Clarkson

引用次数: 36

IS THE REGIME WITH SHOT NOISE SUPPRESSION BY A FACTOR 1/3 ACHIEVABLE IN SEMICONDUCTOR DEVICES WITH MESOSCOPIC DIMENSIONS? 在具有介观尺寸的半导体器件中，散粒噪声抑制因子为1/3是否可以实现?

The Random and Fluctuating World Pub Date : 2012-05-16 DOI: 10.1142/S0219477512400123

P. Marconcini, M. Macucci, D. Logoteta, M. Totaro

引用次数: 11

ROGUE WAVES IN SPATIALLY EXTENDED OPTICAL SYSTEMS 空间扩展光学系统中的异常波

The Random and Fluctuating World Pub Date : 2012-05-16 DOI: 10.1142/S0219477512400147

S. Residori, U. Bortolozzo, A. Montina, F. Lenzini, F. Arecchi

{"title":"ROGUE WAVES IN SPATIALLY EXTENDED OPTICAL SYSTEMS","authors":"S. Residori, U. Bortolozzo, A. Montina, F. Lenzini, F. Arecchi","doi":"10.1142/S0219477512400147","DOIUrl":"https://doi.org/10.1142/S0219477512400147","url":null,"abstract":"Giant anomalous events may occur in systems characterized by many waves, with extremely high amplitude waves appearing with a probability much higher than expected for a random dynamics. Such rare, and giant, events are known to occur on the ocean surface and have been named, in that context, \"rogue waves\". We present here some recent experimental results on the statistical properties of giant optical waves, or \"optical rogue waves\", observed in spatially extended optical systems. We will present the main statistical features of such extreme events, then, based on both a linear and a nonlinear experiment, we will outline a way enabling us to identify two key ingredients at the origin of optical rogue waves, namely, granularity, that is, a minimal size of the individual light spots, and inhomogeneity, that is, clustering of the light spots into separate domains with different average intensities. In the linear experiment we measure also the statistics of the waiting times between successive rogue waves and we show that it follows a log-Poisson distribution, which is characteristics of event separation observed in cooperative, complex systems and in such different fields as geophysics and biology.","PeriodicalId":191232,"journal":{"name":"The Random and Fluctuating World","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124649228","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 11

NONEQUILIBRIUM RATE THEORY FOR CONDUCTION IN OPEN ION CHANNELS 开放离子通道中传导的非平衡速率理论

The Random and Fluctuating World Pub Date : 2012-05-16 DOI: 10.1142/S0219477512400160

R. Tindjong, I. Kaufman, P. McClintock, D. G. Luchinsky, R. Eisenberg

引用次数: 3