Listar Artículos por autor "Moya-Roque, Róger"
Mostrando ítems 1-20 de 23
-
Application of the X-ray densitometry in the evaluation of the quality and mechanical properties of biomass pellets
Tomazello-Filho, Mario; Valaert, Jorre; Tenorio-Monge, Carolina; Moya-Roque, Róger (Elsevier, 2015-04)The use of the X-ray technique and the X-ray densitometry to determine pellet particle distribution and to understand the biomass compaction and its effects in pellet properties has been limited. The present work evaluates ... -
Biomass yield and energy potential of short-rotation energy plantations of Gmelina arborea one year old in Costa Rica
Arias-Aguilar, Dagoberto; Briceño-Elizondo, Elemer; Tenorio-Monge, Carolina; Moya-Roque, Róger (Elsevier, 2016)Short-rotation woody plantations have been recently established in Costa Rica and Gmelina arborea has gained popularity The present work assesses tree diameter and height, biomass distribution, specific gravity, green ... -
Biopulp from pineapple leaf fiber produced by colonization with two white-rot fungi: Trametes versicolor and Pleurotus ostreatus
Rodríguez-Zúñiga, Ana; Rodriguez-Solis, María; Villalobos-Barquero, Verónica; Vega-Baudrit, José; Moya-Roque, Róger; Berrocal-Jiménez, Alexander; Starbird-Pérez, Ricardo (BioResources, 2016)Trametes versicolor and Pleurotus ostreatus were used for the biopulping from pineapple leaf fiber (PALF). PALF substrate was subjected to T. versicolor for 2 to 6 weeks and to P. ostreatus for 4 to 8 weeks. The yields, ... -
Characterisation of pellets made from oil palm residues in Costa Rica
Valaert, Jorre; Tenorio-Monge, Carolina; Moya-Roque, Róger (Journal of Oil Palm Research, 2016)Presently, there are around 67 000 ha of oil palm (Elaeis guineensis) in Costa Rica. The resulting post-harvest residues are not being used currently. These residues can be employed for generation of heat by means of ... -
Characteristics and properties of torrefied biomass pellets from Gmelina arborea and Dipterix panamensis at different times
Gaitán-Álvarez, Johanna; Moya-Roque, Róger (Revista Chapingo, Serie Ciencias Forestales y del Ambiente, 2016)Torrefaction and pelletizing were studied in the generation of energy from lignocellulosic residues to increase the energy properties of the biomass. The aim of this study was torrefied sawdust from Gmelina arborea and ... -
Effects of adding multiwall carbon nanotubes on performance of polyvinyl acetate and urea-formaldehyde adhesives in tropical timber species
Rodríguez-Zúñiga, Ana; Vega-Baudrit, José; Moya-Roque, Róger (Hindawi Publishing Corporation, 2015)Multiwall carbon nanotubes (MWCNTs) functionalized with hydroxyl groups (MWCNTs-OH) have been incorporated into polyvinyl acetate (PVAc) and urea-formaldehyde (UF) adhesives utilized in tropical wood gluing. The Raman ... -
Effects of adding nano-clay (montmorillonite) on performance of polyvinyl acetate (PVAc) and urea-formaldehyde (UF) adhesives in Carapa guianensis, a tropical species
Rodríguez-Zúñiga, Ana; Vega-Baudrit, José; Alvarez, Vera; Moya-Roque, Róger (Elsevier Ltd, 2015-06)The aim of this study was to improve the bond strength resistance of polyvinyl acetate (PVAc) and urea-formaldehyde (UF) adhesives modified with nano-clay (montmorillonite) with a tropical species of wood known to exhibit ... -
Effects of thinning on diameter, heartwood, density and drying defects of gmelina arborea
Vallejos, Jonathan; Serrano, Rafael; Moya-Roque, Róger (Universidade Federal de Sao Carlos, 2015)The effect of three levels thinning intensity in Gmelina arborea plantation on tree diameter, heartwood (diameter and percentage), wood density and drying defects (twist, crook, bow and check) was studied. Wood used for ... -
Effects on density, shrinking, color changing and chemical surface analysis through FTIR of Tectona grandis thermo-treated: Density, shrinking, color changing and chemical analysis by FTIR of the thermally-treated teak wood
Moya-Roque, Róger; Méndez-Mejías, Luis Diego (Forest Sciences, 2016)Thermal-treatment wood is used as an option to improve durability of wood in recent years. This study evaluated the effect of temperature in thermally treated Tectona grandis wood in density, shrinking, color changing ... -
Evaluation of biodeterioration and the dynamic modulus of elasticity of wood in ten fast-growing tropical species in costa rica exposed to field testing
Moya-Roque, Róger (Statny Drevarsky Vyskumny Ustav, 2015)In tropical regions, it is possible to produce a large variety of timber species in plantation conditions. However, wood from these trees has low natural durability. Biodeterioration and the dynamic modulus of elasticity ... -
Evaluation of chemical compositions, air-dry, preservation and workability of eight fastgrowing plantation species in Costa Rica
Moya-Roque, Róger; Salas-Garita, Cynhtia; Berrocal-Jiménez, Alexander; Valverde-Otárola, Juan Carlos (Revista Madera y Bosques, 2015)Costa Rica has successfully planted various forestry species for wood production. However, the use of their wood is limited, due to poor knowledge about their chemical properties, air-dry, preserved and workability ... -
Evaluation of wood properties from six native species of forest plantations in Costa Rica
Moya-Roque, Róger; Tenorio-Monge, Carolina; Salas-Garita, Cynthia; Berrocal-Jiménez, Alexander (Bosque, 2016)This study details information about physical, chemical and mechanical properties, drying, preservation and workability of wood from Cordia alliodora, Dipteryx panamensis, Enterolobium cyclocarpum, Hieronyma alchorneoides, ... -
General, physical and mechanical properties, termites resistance and drying defects of lumber of Tectona grandis from plantations of different climatic and sites fertility condition
Serrano-Montero, Rafael; González-Trejos, Guillermo; Córdoba-Foglia, Rafael; Moya-Roque, Róger; Berrocal-Jiménez, Alexander (Springer India, 2015-06)The influence of climatic and site fertility conditions affect wood quality from fast growing trees. The change in tree diameter, thickness of sapwood, heartwood percentage and bark and pith tissue, physical and mechanical ... -
Kiln drying behavior utilizing drying rate of lumber from six fast-growth plantation species in Costa Rica
Moya-Roque, Róger; Tenorio-Monge, Carolina; Salas-Garita, Cynthia (Drying Technology, 2016)The objective was to study the effect of the drying time and moisture content variations on the drying rate during kiln drying. The moisture content is a good predictor of the variation in drying rate; to determine the ... -
Mineral content in relation to radial position, altitude, chemical properties and density of persian ironwood
Kiaei, Majid; Kord, Behzad; Chehalmardian, Ahmad; Farsi, Mohammad; Moya-Roque, Róger (Universidade Federal de Sao Carlos, 2015)Persian ironwood (Parrotia persica) is native species from Iran and covers 10,54% of the commercial volume. Its wood structure and its chemical composition are affected by growth conditions. The aim of the study was to ... -
Optical performance of finished and unfinished tropical timbers exposed to ultraviolet light in the field in Costa Rica
Moya-Roque, Róger; Vargas-Fonseca, Lupita; Salas-Garita, Cynthia (Wood Material Science & Engineering, 2016)This study evaluated wood color change (ΔE*) and the surface quality in 10 tropical wood species painted with three finishes (composed of wax and polyurethane). Two weathering conditions were tested: natural weathering ... -
Pellets Evaluation Made from Tropical-Climate Agricultural and Forestry Crops of Costa Rica with a Domestic Stove
Rodríguez-Zúñiga, Ana; Valdez, Juan; Valaert, Jorre; Moya-Roque, Róger; Tenorio-Monge, Carolina (Springer Netherlands, 2015-12)The present study shows the results of the evaluation of the pellets made from two forestry crops and eight agricultural crops in Costa Rica by employing a 50 kW domestic stove. Methods: The following variables were ... -
Physical properties and fiber dimension in Stem, Branch and root of Alder Wood
Moya-Roque, Róger; Kiaei, Majid (Parlar Scientific Publications, 2015-01)The aim of this study was to determine physical properties and fiber dimensions in stem, branch and root wood for alder (Alnus glutinosa L) species. For this purpose, three normal alder trees were selected from Khanican ... -
Production and quality analysis of pellets manufactured from five potential energy crops in the Northern Region of Costa Rica
Aragón-Garita, Stephanie; Moya-Roque, Róger; Bond, Brian; Valaert, Jorre; Tomazello-Filho, Mario (Biomass and Bioenergy, 2016)Modifications to a pellet manufacturing process must be made based on the characteristics of raw material used. The purpose of this work was to determine the alternations required to a wood pellet manufacturing process ... -
Quality of pellets made from agricultural and forestry crops in costa rican tropical climates
Valaert, Jorre; Tenorio-Monge, Carolina; Moya-Roque, Róger; Tomazello-Filho, Mario (North Carolina State University, 2015)Pellets may be produced with different types of agriculture or forestry crops in Costa Rica. This work evaluated the energy, physical, and mechanical properties of pellets fabricated from 12 types of agricultural and ...