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Now showing items 836-855 of 1620
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Hidrogenación de acroleína y crotonaldehído sobre catalizadores de ir soportado
Se evaluó el comportamiento de diferentes catalizadores de Ir, en la hidrogenación de aldehídos a,b-insaturados, acroleína y crotonaldehído, para la obtención de sus alcoholes insaturados alcohol alílico y crotílico ...Universidad Nacional de Colombia Revistas electrónicas UN Dyna. -
Hidrogenación de crotonaldehído sobre catalizadores ir/tio2-sio2
Se estudió la hidrogenación de crotonaldehído en fase líquida, sobre catalizadores Ir/TiO2-SiO2; este aldehído es altamente contaminante y proviene de fuentes tan diversas como humo de tabaco, gases de escape de motores ...Universidad Nacional de Colombia Revistas electrónicas UN Dyna. -
Hidrogenación de furfural sobre catalizadores ir/nb2o5. estudio cinético
Se estudió la cinética de hidrogenación de furfural sobre el catalizador Ir/Nb2O5 que presenta el efecto SMSI (Fuerte interacción metal soporte). Se examinaron el efecto de diferentes parç–¥etros de reacción como concentración ...Universidad Nacional de Colombia Revistas electrónicas UN Dyna. -
High performance control of a three-phase PWM rectifier using odd harmonic high order repetitive control
The control goal for three-phase pulse width-modulated rectifiers focuses on generating sinusoidal input currents and regulating the DC output voltage. Despite the fact that control strategies such as resonant and repetitive ...Universidad Nacional de Colombia Revistas electrónicas UN Dyna. -
High power printed circuit board design for automotive fuse block usage
The minimal size for the conductor calculation is always the first point of interest when an electrical designer is creating a High Power Printed Circuit Board for automotive applications; in this paper you will see the ...Universidad Nacional de Colombia Revistas electrónicas UN Dyna. -
Highway designs: effects of heavy vehicles stability
From the perspective of heavy vehicles stability, some criteria of stability should be adhered to highway designs. In particular, the relationship between minimum radius, superelevation, slope angle, side friction, and ...Universidad Nacional de Colombia Revistas electrónicas UN Dyna. -
HMI/ SCADA standards in the design of data center interfaces: A network operations center case study
This paper presents an evaluation of interfaces at the Network Operations Center NOC (Network Operations Center) in terms of HMI standards and related regulations, as well as the ergonomic monitoring GEDIS guide. The Centre ...Universidad Nacional de Colombia Revistas electrónicas UN Dyna. -
Hotelling’s t² control charts based on robust estimators
Under the presence of multivariate outliers, in a Phase I analysis of historical set of data, the T² control chart based on the usual sample mean vector and sample variance covariance matrix performs poorly. Several ...Universidad Nacional de Colombia Revistas electrónicas UN Dyna. -
How to promote distributed resource supply in a Colombian microgrid with economic mechanism?: System dynamics approach
Distributed generation currently has caused an increase in the installation or renewable energy generation resources near the consumption centers and the ability to operate in the event of a failure of the interconnected ...Universidad Nacional de Colombia Revistas electrónicas UN Dyna. -
Human error and response to alarms in process safety
Human operators are required to respond to alarms in normal conditions, and also to find solutions to unexpected situations in real time. The aim of this study is to increase the knowledge of human responses to alarms in ...Universidad Nacional de Colombia Revistas electrónicas UN Dyna. -
Hybrid approach for an optimal adjustement of a knowledge-based regression technique for locating faults in power distribution systems
This paper is focused in the development of a hybrid approach based on support vector machines (SVMs) which are used as a regression technique and also in the Chu-Beasley genetic algorithm (CBGA) which is used as an ...Universidad Nacional de Colombia Revistas electrónicas UN Dyna. -
Hybrid methodology for modeling short-term wind power generation using conditional Kernel density estimation and singular spectrum analysis
A fundamental part of the probabilistic forecasting of wind energy process is to take into account wind speed forecasts. To achieve accurate probabilistic forecast of wind output, it is developed a hybrid methodology using ...Universidad Nacional de Colombia Revistas electrónicas UN Dyna. -
Hydraulic conductivity in layered saturated soils assessed through a novel physical model
This paper introduces a novel physical model for measuring the hydraulic conductivity of granular materials in saturated conditions. An innovation in the location of the device’s piezometers allows the device to be used ...Universidad Nacional de Colombia Revistas electrónicas UN Dyna. -
Hydro-meteorological data analysis using olap techniques
The wealth of data recorded by meteorological networks provides a great opportunity for analyzing and discovering knowledge. However, efficient data storage and its effective handling are prerequisites for meteorological ...Universidad Nacional de Colombia Revistas electrónicas UN Dyna. -
Hydrodynamic effects asociated to methyl ester sulphonation in falling film reactors
Falling film reactors (FFR) are widely used in industry, mainly in those processes which require an efficient heat exchange. Although, these devices have been studied for several years, there is not yet a full understanding ...Universidad Nacional de Colombia Revistas electrónicas UN Dyna. -
Hydrogen kinetics limitation of an autotrophic sulphate reduction reactor
Sulphate-reducing bacteria (SRB) are microorganisms that can be used as removal agents in polluted water sources. The use of inorganic substrates in SRB systems could reduce the cost and simplify operation. However, the ...Universidad Nacional de Colombia Revistas electrónicas UN Dyna. -
Hydrogen production in a novel configuration of UASB reactor under different hydraulic retention time
The aim of this work was to evaluate the production of hydrogen in a conventional and hybrid Upflow Anaerobic Sludge Blanket (UASB) reactors by modifying the hydraulic retention time (HRT). Both reactors operated continuously ...Universidad Nacional de Colombia Revistas electrónicas UN Dyna. -
Hydrologic and hydraulic simulations for use in macrodrainage designs for gully management and recovery
Runoff on susceptible terrains that is not associated with adequate drainage causes soil erosion, as gullies. Gullies and drainage continue to be major issues in reclamation projects since soil erosion can be reactivated ...Universidad Nacional de Colombia Revistas electrónicas UN Dyna. -
Hydrothermal synthesis of hydroxyapatite nanorods using a fruit extract template
Biocompatible materials development for the replacement of human body parts has been one of the needs of science. Hydroxyapatite is a bioceramic similar to the mineral component present in the human hard tissues and animal ...Universidad Nacional de Colombia Revistas electrónicas UN Dyna. -
Hydrothermal transformation of kaolinite in the system k₂osio₂al₂o₃h₂o
A kaoliniterich raw material was treated hydrothermally with 1.33 and 3.99M KOH solutions at 100 and 175 °C during different reaction times ranging from 24 to 528 h. The synthesis products were characterized by Xray ...Universidad Nacional de Colombia Revistas electrónicas UN Dyna.
