A5005819728- Magnetic Properties of Alloys
- Rare-earth and actinide compounds
- Metal and Thin Film Mechanics
- Advanced materials and composites
- Metallic Glasses and Amorphous Alloys
- Recycled Aggregate Concrete Performance
- Metal Alloys Wear and Properties
- Concrete and Cement Materials Research
- Drilling and Well Engineering
- Advanced ceramic materials synthesis
- Concrete Corrosion and Durability
- Enhanced Oil Recovery Techniques
- Environmental and Ecological Studies
- Metallurgical and Alloy Processes
- Innovative concrete reinforcement materials
- Solid State Laser Technologies
- Magnetic properties of thin films
- Graphite, nuclear technology, radiation studies
- Occupational Health and Safety in Workplaces
- Hydrogen Storage and Materials
- Magnetic Properties and Applications
- Magnetic Properties and Synthesis of Ferrites
- Traffic and Road Safety
- Hydraulic Fracturing and Reservoir Analysis
- Engineering and Information Technology
University of Ottawa
2023
Pedagogical and Technological University of Colombia
2013-2021
University of Tolima
2005-2013
Ghent University
2009-2010
RWTH Aachen University
2007
Petroleum of Venezuela (Venezuela)
2002
Abstract This paper presents evaluations of stability and rheological behavior aqueous foam formulations. The these systems was evaluated by the Ross-Miles method, using half-life measurements, studied as a function type concentration surfactants, polymers salts. effect contaminants such crude oil is also examined. A capillary tube viscometer used to perform studies. variables quality foam, pressure system, diameter polymer shown. Results were corrected for wall slip normalized equalized...
An efficient method to produce ecoefficient cementitious mixtures is using particle packing models (PPMs) combined with limestone fillers (LF). Yet, key outcomes obtained in the fresh and hardened states, including slump compressive strength, are variable remain mostly not fully understood. Therefore, this work, concept of interparticle separation distance (IPS) employed describe overall performance cement paste high LF dosages [up 81% ordinary Portland (OPC) replacement]. In scenario,...
The present work includes the first advances in development of investigations that seek to include Ground Grinding Glass (GRR) and Electric Arc Furnace Slag (EAFS) production mixtures hydraulic concrete mixing them simultaneously, so it satisfies specifications techniques be used construction rigid pavements. Firstly, we cite tests carried out on different materials obtain their physical, chemical mechanical characterization determine compliance, as well measurement certain characteristics...
Abstract This paper presents operational results of the pilot test under near balanced conditions a new foam drilling fluid developed by PDVSA-Intevep in an inclined well drilled La Paz Field Western Venezuela. The target formations were fractured, depleted limestone low pressure, and reservoir contains highly fractured hard rocks, known for deferred oil production due to flushing lost circulation. Similar wells with aerated fluids vicinity have shown very rates penetration, short bit lives,...
The joining of tungsten and carbon-based materials is demanding due to the incompatibility their chemical thermophysical properties. Direct unfeasible by reason brittle carbide formation. High-temperature brazing has been investigated in order find a suitable filler metal (BFM) which successfully acts as an intermediary between incompatible properties base materials. So far only low Cr-alloyed Cu-based BFMs provide preferential combination good wetting action on both materials, tolerable...
Concrete is one of the most studied industrial products with aim improving its durability, strength, and workability, as well developing innovative alternatives in production to reduce environmental footprint (Rivera, 2013). This research validates use waste generated department Boyacá - Colombia, within concrete for construction rigid pavements. The followed several stages, beginning physical, chemical, mechanical characterization materials design standard mixture following ACI 211...
El presente documento plantea una alternativa para la evaluación de seguridad en carreteras rurales dos carriles Colombia, dada ausencia este tipo prácticas ingeniería vías Colombianas. Por lo anterior, se aborda a profundidad el Módulo Predicción Accidentes (CPM CrashPrediction Module) del programa IHSDM (Interactive Highway Safety Design Model) FHWA (Federal Administration, agencia departamento transporte Estados Unidos), adoptado ampliamente otros países evaluar vial. De modo, presenta...
Field Application of Near-Balanced Drilling Using Aqueous Foams in Western Venezuela Y. Rojas; Rojas PDVSA Search for other works by this author on: This Site Google Scholar P. Vieira; Vieira M. Borrell; Borrell J. Blanco; Blanco Ford; Ford L. Nieto; Nieto G. Lopez; Lopez B. Atencio Paper presented at the IADC/SPE Conference, Dallas, Texas, February 2002. Number: SPE-74449-MS https://doi.org/10.2118/74449-MS Published: 26 2002 Cite View Citation Add to Manager Share Icon Twitter LinkedIn Get...
The boom in the construction of big engineering projects has boosted demand steel, which turn increased production steel waste. This is cause for environmental same time, exploitation non-renewable natural resources like stone aggregates also deteriorating ecosystems, while regulations doing so are becoming stricter, thus inflating costs. These scenarios lead to a paradigm shift: using unconventional materials and employing recycling techniques existing pavements. use industrial waste...
This article presents the efficiency of using concrete mixtures replacing 75% gravel by electric arc furnace slag, and simultaneously 20%, 30% 40% sand recycled ground glass. The selected replacements correspond to results obtained authors in previous research. materials were analysed physically, chemically, mechanically. studied compression bending samples cylinders, beams loaded thirds section, respectively. Through scanning electron microscope analysis, adherence between aggregates cement...
From comparative dry sliding pin-on-plate experiments on distinctive WC-Co and WC-Ni cemented carbides, machined by grinding or wire-EDM, correlations are derived between wear rate, volume coefficient of friction contact load, distance, microstructure surface finish condition. The EDM induced modification turns out to deteriorate resistance, especially during the wear-in stage sliding. These findings in agreement with X-ray diffraction measurements residual stress level WC phase.
Abstract Titan und Titanlegierungen weisen hohe spezifische Festigkeiten bis zu einer Temperatur von ca. 600 °C auf, verbunden mit ausgezeichneten Korrosionsbeständigkeit [1]. Ein entscheidendes Hindernis für den noch breiteren Einsatz stellt allerdings die geringe Verschleißbeständigkeit dar. Insbesondere sind Titanwerkstoffe gegenüber Reibermüdung Erosionsverschleiß anfällig. Um dieser technischen Einschränkung begegnen, müssen Beschichtungsverfahren entwickelt werden. Einen...
Abstract In this work we report the magnetic and structural properties obtained by Mössbauer spectrometry, Vibrating Sample Magnetometry X‐ray diffraction, of powder Nd 2 Fe 14 B prepared mechanical alloying. The mixtures were ball milled during 48 hours submitted to heat treatments between 500 900 °C under an argon atmosphere. Structural parameters derived from high statistics patterns. spectra registered at 300 K for samples without treatment fitted means a sextet hyperfine field...