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Browsing Earth Sciences Research Journal by Title
Now showing items 234-253 of 373
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Observación y análisis de la variación de parámetros geofísicos de un pozo ubicado en el piedemonte llanero
Este artículo presenta el desarrollo de instrumentación especializada que se diseñó y se puso en funcionamiento con el fin de realizar la bservación y el análisis de la variación de parámetros geofísicos de un pozo ubicado ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Occurrence of Cr-bearing beryl in stream sediment from Eskişehir, NW Turkey
Beryl crystals are found within stream sediments transecting schists in the northeast of Eskişehir, western Anatolia. This paper studied the Eskişehir beryl crystals with optical microscopy, scanning electron microscopy ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Oil decontamination of bottom sediments experimental work results
This article presents the results of experimental work during 2004-2005 on oil decontamination of bottom sediments of Lake Schuchye, situated in the Komi Republic (Northern Russia). The cause of thecontamination were huge ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Online Outlier Detection for Time-varying Time Series on Improved ARHMM in Geological Mineral Grade Analysis Process
Given the difficulty of accurate online detection for massive data collecting real-timely in a strong noise environment during the complex geological mineral grade analysis process, an order self-learning ARHMM (Autoregressive ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Operadores diferenciales en el análisis de señales en geofísica
EI objetivo de este artículo es mostrar la utilidad que tienen los operadores vectoriales en el análisis e interpretación de información en Geofísica. Con éste propósito, se plantean algunos filtros digitales y se sugiere ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Optimización en la solución del problema inverso en geofísica usando el algoritmo de entrenamiento supervisado de levenberg-marquardt
En este trabajo se presenta una metodología para el entrenamiento supervisado de redes neuronales, utilizando el algoritmo de Levenberg-Marquardt. Este método se aplica en gravimetría para optimizar la convergencia en el ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Optimization of land use at Mt. Yuelu scenic area: an analysis using the ecological green equivalent
This study applies the ecological green equivalent approach to evaluating the land use structure of Mt. Yuelu scenic area in Hunan Province, China. A mathematical model is established based on land use and land cover data, ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Origin of Earthquake Light Associated with Earthquakes in Christchurch, New Zealand, 2010-2011
Earthquake light (EQL) mainly blue-white flashes from the ground, was observed coseismically during a NewZealand M7.1 earthquake, (4.47 am 4-Sep-2010 local time). A local production mechanism is most probable. The blue-white ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Ossodas, a portable digital system for seismological signal acquisition
This paper presents the concept and design of a digital system to record seismological signals. The hardware and software designed has been interfaced to the PC 104 BUS architecture in order to achieve a modular system to ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Oxygen and Carbon Isotopic Composition of Carbonate Rocks of the Permian Qixia Formation, Sichuan Basin: Thermal Effects of Emeishan Basalt
The late Permian thermal events related to Emeishan Basalt has made a great impact on the underlying carbonate rock properties in the western margin of the Yangtze Platform. In this paper, we investigate the carbon and ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Paleontological study of the echinoderms in the qom formation (central iran)
The Qom formation was formed in the Oligo-Miocene during the final sea transgression in Central Iran (Figure 1). The best outcrop is located in the vicinities of the Qom City, approximately 130km at the south of Tehran. ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Perfil altitudinal de la temperatura media del aire en Colombia
Se establecen ecuaciones que relacionan la temperatura media anual del aire enColombia con la altitud. Por medio de ellas se posibilita estimar los valores de esa temperatura en cualquier lugar, con el requisito de conocer ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Performance of Single Base RTK GNSS Method versus Network RTK
After the late 1990s, GNSS/GPS network RTK technology has become the preferred technique in the world, today widely used in various applications such as monitoring, early warning systems, and mapping and engineering ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Petrogenesis of the metacarbonate and related rocks of the silgará formation, central santander massif, colombian andes: an overview of a “reaction calcic exoscarn”
Metacarbonate rocks (pure and impure marbles, carbonate-silicate rocks, calc-silicate rocks and carbonate-bearing silicate rocks) form a very complex group within the metamorphic sequence of the Silgará Formation at the ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Petrographical study of ewekoro carbonate rocks, in ibese, south western nigeria
Limestone deposits can be found in every system of the geologic column since the Precambrian. In classifying this rock, various attempts have been made and notable among them is the classification scheme based on three ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Petrography and application of the rietveld method to the quantitative analysis of phases of natural clinker generated by coal spontaneous combustion
Fine-grained and mainly reddish color, compact and slightly breccious and vesicular pyrometamorphic rocks (natural clinker) are associated to the spontaneous combustion of coal seams of the Cerrejón Formation exploited by ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Petrologic significance of Fe-rich staurolite in pelitic schists of the Silgará Formation, Santander Massif
Medium grade metapelites of the Silgará Formation at the Santander Massif (Colombian Andes) have been affected by a medium-pressure/high-temperature Barrovian type of metamorphism, developing a sequence of metamorphic zones ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Petrology and mineralogy of the Fenghuanshan granodiorite, Anhui Province, China: implications for petrogenesis and metallogenesis implication
The Fenghuangshan copper deposit, in the Tongling area of Anhui Province, China, is genetically associated with the Fenghuangshan granodiorite, which contains amphiboles that can be used to determine the pressure and ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Petrophysical properties of the Lower Cretaceous formations in the Shaikhan oilfield, northern Iraq
The current study represents an evaluation of the petrophysical properties in the well Shaikhan-8 for the Garagu, Sarmord and Qamchuqa formations in Shaikhan oilfield, Duhok basin, northern Iraq. The petrophysical evaluation ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
PNN-based Rockburst Prediction Model and Its Applications
Rock burst is one of main engineering geological problems significantly threatening the safety of construction. Prediction of rock burst is always an important issue concerning the safety of workers and equipment in tunnels. ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal.
