Tipo de Material
Mostrando documentos 21-40 de 373
-
An approximate method for estimating nutrient loads in drainage water from a coastal irrigated area
In this work an estimation of nutrient loads (expressed as Dissolved Inorganic Nitrogen and Inorganic Phosphorous) in drainage water from a coastal irrigated area, was undertaken. The procedure is based on the calculation ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
An Assessment Method for Debris Flow Dam Formation in Taiwan
Debris flows in tributaries rush into and block the main branches of rivers and often result in serious hazards. Dam failures cause large floods in the downstream area and can lead to fatalities and property damage. This ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
An engineering geological appraisal of the chamshir dam foundation using dmr classification and kinematic analysis, southwest of iran
This paper describes the results of engineering geological investigations and rock mechanics studies carried out at the proposed Chamshir dam site. It is proposed that a 155 m high solid concrete gravity-arc dam be built ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
An Evaluation of Recent Global Geopotential Models for Strip Area Project in Turkey
The aim of this study is to present the evaluations based on comparisons of geoid heights that are computed from several global geopotential models (GGMs) and the GNSS/levelling data. In this application framework, differences ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Analysis and comparison model for measuring tropospheric scintillation intensity for ku-band frequency in malaysia
This study has been based on understanding local propagation signal data distribution characteristics and identifying and predicting the overall impact of significant attenuating factors regarding the propagation path such ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Analysis of aeromagnetic data for interpretation of seismicity at fayoum-cairo area, egypt
An aeromagnetic reconnaissance study is presented to delineate the subsurface structure and tectonic setting at the Fayoum-Cairo district, which experienced a damaging earthquake on October 12, 1992 of magnitude (M = 5.7). ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Analysis of aeromagnetic data over wamba and its adjoining areas in north-central nigeria
An aeromagnetic intensity contour map of Wamba was acquired, digitised and analysed. The study was aimed at mapping metalliferous mineral deposits in basement rocks, delineating structural lineaments and their trends as ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Analysis of Mechanical Characteristics and Instability Law of Inverse Fault under the Influence of Mining
In order to explore the mechanical characteristics and stability of the reverse fault under the influence of mining, an inverse mechanics model has been built under work face mining conditions, according to the law of ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Analysis of October 23 (Mw 7.2) and November 9 (Mw 5.6), 2011 Van Earthquakes Using Long-Term GNSS Time Series
The eastern Anatolia provides one of the best examples of an area of rapid deformation and intense contraction that is the consequence of an active continental collision between the Arabian and Eurasian plates leading to ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Analysis of phosphate deposit “disturbances” using the horizontal-gradient responses of resistivity data (oulad abdoun, morocco)
In the great Oulad Abdoun Basin exploitation of a new phosphate deposit was begun after the Grand Daoui horizon was exhausted. Inclusions of sterile hardpan-so-called "disturbances" -are hard to detect and interfere with ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Análisis de la amplitud referenciada con trayectorias de rayo y su aplicación en avo
EI análisis AVO se basa en la variación de amplitudes de ondas con el offset, determinada entre otras causas por las propiedades elásticas de las rocas.Las variables necesarias para caracterizar el comportamiento elástico ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Análisis de las condiciones que favorecen el desarrollo de la actividad convectiva de las tormentas eléctricas en la sabana de bogotá
La predicción de la actividad convectiva en los trópicos es un problema aun sin resolver. Las dificultades para resolverlo están asociadas con el hecho de que este fenómeno se presenta a menudo como resultado de una compleja ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Análisis de sensibilidad en la estimación de la función característica de punta de hamilton de la sísmica geométrica
Usando la aproximación de segundo orden de los tiempos de Tránsito en modelos sísmicos constituidos por capas homogéneas e isotrópicas separadas por interfaces suaves, los tiempos de los eventos de reflexión registrados ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Análisis espacial y temporal de q-coda en el piedemonte llanero (colombia)
La variación espacial y temporal del parámetro de atenuación Q-Coda en un sector del Piedemonte Llanero es estudiada usando las ondas Coda. La estirnación de la atenuación de la amplitud de la coda se calcula por medio del ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Aplicación del análisis de fourier para describir la variación diurna de elementos climáticos
En este trabajo, con base en los valores medios horarios de la presión, temperatura y humedad relativa del aire, determinados en la estación Observatorio Meteorológico Nacional, ubicada en la Ciudad Universitaria de Santafé ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Application of a heuristic method for the estimation of s-wave velocity structure
The assessment of local site effects is one of the most important subjects in Engineering Seismology. In order to perform an assessment, it is necessary to determine the S-wave velocity structure of the site. Additionally, ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Application of Artificial Neural Network for Predicting Shaft and Tip Resistances of Concrete Piles
Axial bearing capacity (ABC) of piles is usually determined by static load test (SLT). However, conducting SLT is costly and time-consuming. High strain dynamic pile testing (HSDPT) which is provided by pile driving analyzer ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Application of gravimetry and electric tomography methods to obtain stratigrafic profiles: case study at university of quindío and puerto espejo area, armenia-colombia
Se describe la metodología usada para desarrollar campañas geofísicas de resistividad y gravimetría aplicadas al subsuelo. Estos son métodos totalmente indirectos cuyo propósito es determinar los contrastes de densidad y ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Application of neural networks to obtain the site response in mexico city
Hemos implementado una red neuronal de tres capas escondidas con 40 neuronas por capa para ser usada como funciones de trasferencia suelo/roca en dos estaciones acelerométricas en Ciudad de México. La red fue entrenada con ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal. -
Application of seismic refraction tomography for tunnel design in santa clara mountain, san juan, argentina
A geophysical survey involving seismic refraction tomography (SRT) for mapping 'P' waves was carried out in Sierra Santa Clara, San Juan Province, Argentina in July 2009. The purpose of the geophysical survey was to determine ...Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal.