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Evidence of Correlation between High Frequency Geomagnetic Variations and Seismicity in the Caribbean

Open Journal of Earthquake Research 2021年第2期10卷 30-41页

作者： bladimir moreno Eric Calais Centro Nacional de Investigaciones Sismológicas CENAIS Santiago de Cuba Cuba Ecole Normale Superieure Department of Geoscience Paris France

An analysis between the hourly distribution of earthquakes in three areas of the Caribbean and the high-frequency variations of the geomagnetic field is presented. The number of earthquakes selected for each zone is between 10,000 and 43,000, which guarantees a statistically significant distribution. The hourly distributions of seismicity in all areas show a bay-shape distribution with a significant increase in the number of earthquakes at night, from 11 PM to 5 AM. For example, in eastern Cuba 36.7% of earthquakes occur at that time, representing 11.7% over 25% in the absence of any time preference. Geomagnetic disturbances were compiled from several years to be able to make a statistically significant hourly distribution of their occurrence, being determined by sudden changes in the magnetic field at a short period of 1 minute. In this sense, geomagnetic data were processed between the years 2011-2016, recorded by the geostationary satellite GOES13 and the magnetic ground station SJG in San Juan, Puerto Rico. The result shows a significant correlation between hourly earthquakes distribution and high-frequency geomagnetic variations. The time-varying conductivity response of Earth’s interior also correlates with seismicity. The theory behind this correlation could be related to the piezoelectric phenomena and the electromagnetic force induced when the magnetic field is disturbed.

关键词： Caribbean Seismicity Conductivity Response Geomagnetic Storms Hourly Earthquakes Frequency Electromagnetic Induction Eddy Currents Geomagnetic Field

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Dimensionality reduction of hyperspectral images of vegetation and crops based on self-organized maps

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Information Processing in Agriculture 2021年第2期8卷 310-327页

作者： David Ruiz Hidalgo bladimir Bacca Cortés Eduardo Caicedo Bravo Perception and Intelligent Systems Research Group School of Electrical and Electronic EngineeringUniversidad del ValleSantiago de Cali 76001Colombia

Hyperspectral images are multidimensional massive sets of information that have shown a great potential for different kind of applications as urban mapping,environmental management,vegetation and crops supervision and mineral ***,due to its high dimensional nature and the high variability of the spectral information,the dimensionality reduction process is one of the main challenges in processing hyperspectral *** aim of dimensionality reduction is to eliminate redundant information and simplify the subsequent processes of classification and the search of *** this context,several dimensionality reduction methods have been proposed,but most of them are not flexible enough to deal with the particular features of the hyperspectral *** this way,the use of intelligent methods as neural networks and specially an unsupervised approach as self-organized maps,may improve the dimensionality reduction stage and the final classification *** paper proposes an unsupervised method for the dimensionality reduction of hyperspectral images based on Kohonen self-organized maps,which,compared with other traditional methods such as principal component analysis(PCA)and wavelet decomposition,provides better classification *** results provided in this paper use an RBF(radial basis function)*** average,the proposed method provides a 64%dimensionality reduction and an 88.5%classification *** results suggest that the dimensionality reduction algorithm based on self-organized maps is an efficient approach compared with other popular *** is due to the ability of self-organized maps to automatically detect(self-organizing)relationships within the set of input patterns,which provides flexibility to deal with the special features of the hyperspectral images.

关键词： Dimensionality reduction Hyperspectral images Principal component analysis Radial basis function Remote sensing Self-organized maps Wavelet transform

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Minimal Vasovagal Dysautonomia in Patients with Rare or Unique Syncope

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International Journal of Clinical Medicine 2022年第7期13卷 262-275页

作者： Pedro Jiménez-Cohl Maximiliano Aspeé Magaly Sepúlveda bladimir Lepe José Ignacio Godoy Sofía Jiménez-Castillo Campus San Felipe (Chile) and Department of Neurology and Autonomic Studies Universidad de Valparaíso Hospital Mili-tar de Santiago Santiago Chile Public Health Department Putaendo Chile Campus San Felipe Universidad de Valparaíso San Felipe Chile Universidad de Los Andes Santiago Chile

Introduction: It is common to find people sent to perform a Head Up Tilt Test (HUT) who suffered a single syncope, or syncopes that occur during certain periods and never appear again. We wonder how these people are different from those who have never had syncope. Methods: We found 300 patients who suffered only one (unique) or a maximum of 5 vasovagal syncopes during their life. And their HUT was positive for vasovagal dysautonomia. We compared them, with 120 healthy volunteers who have never had syncope. We try to explain how some constitutional predisposing factors act in these patients, and are associated with environmental triggers to precipitate the syncope. Results: We found differences between cases and controls in predisposing factors such as: heredity, joint hypermobility, baroreflex failure, venous compliance and some neurological diseases. Then an environmental factor acts as a trigger for syncope: prolonged standing, stress, pain and emotions, dehydration, use of certain drugs, abundant food. Conclusions: There are people with minimally expressed vasovagal dysautonomia who have an organic predisposition to present vasovagal syncopes (heredity, joint hypermobility, baroreflex failure, venous compliance, some neurological diseases, etc.). But this predisposition is not enough by itself to produce syncopes. One or more environmental factors must be added, acting as a trigger that would be the reason why these episodes are so infrequent.

关键词： Dysautonomia Unique Vasovagal Syncope Head Up Tilt Test

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哥伦比亚巴兰基利亚马雷贡滨河公共空间

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风景园林 2020年第8期27卷 81-84页

作者：无 Ricardo Vives Guerra Pezzano Ingeniería CONCEP bladimir Salcedo Arenas Asociados Monica Barreneche(摄影) Diego Sanchez Navarro(摄影) 陈馨(翻译) 钱蕾西(校对) Disenos y Conceptos设计事务所不详

位于巴兰基利亚的马雷贡滨河公共空间设计项目是Dise?osy Conceptos设计事务所的最新作品,本着城市自身特色、实用性以及前卫的角度进行设计。该项目源于重建城市与马格达莱纳河之间和谐发展关系的必要性,二者之间的和谐正是影响该城市... 详细信息

位于巴兰基利亚的马雷贡滨河公共空间设计项目是Dise?osy Conceptos设计事务所的最新作品,本着城市自身特色、实用性以及前卫的角度进行设计。该项目源于重建城市与马格达莱纳河之间和谐发展关系的必要性,二者之间的和谐正是影响该城市社会文化和经济发展的重要因素,但曾经一度脱节。

关键词：设计事务所公共空间设计滨河巴兰基利亚哥伦比亚实用性自身特色必要性

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