Evaluation on the Thermal Performance of Selected Tropical Timber Species

InCIEC 2015 ◽  
2016 ◽  
pp. 713-723
Author(s):  
Raihana binti Mohamad Hata ◽  
Rohana Hassan ◽  
Fadzil Arshad
Keyword(s):  
Thermal Performance ◽  
Timber Species ◽  
Tropical Timber

NIRS IDENTIFICATION OF SWIETENIA MACROPHYLLA IS ROBUST ACROSS SPECIMENS FROM 27 COUNTRIES

IAWA Journal ◽  
2016 ◽  
Vol 37 (3) ◽  
pp. 420-430 ◽  
Author(s):  
Maria C.J. Bergo ◽  
Tereza C.M. Pastore ◽  
Vera T.R. Coradin ◽  
Alex C. Wiedenhoeft ◽  
Jez W.B. Braga
Keyword(s):  
Species Identification ◽  
Near Infrared ◽  
Similar Species ◽  
Timber Species ◽  
Cedrela Odorata ◽  
Swietenia Macrophylla ◽  
Classification Rate ◽  
Tropical Timber ◽  
Carapa Guianensis ◽  
Country Level

Big-leaf mahogany is the world’s most valuable widely traded tropical timber species and Near Infrared Spectroscopy (NIRS) has been applied as a tool for discriminating its wood from similar species using multivariate analysis. In this study four look-alike timbers of Swietenia macrophylla (mahogany or big-leaf mahogany), Carapa guianensis (crabwood), Cedrela odorata (cedar or cedro) and Micropholis melinoniana (curupixá) have been successfully discriminated using NIRS and Partial Least Squares for Discriminant Analysis using solid block and milled samples. Species identification models identified 155 samples of S. macrophylla from 27 countries with a correct classification rate higher than 96.8%. For these specimens, the NIRS spectrum variation was more powerful for species identification than for determining provenance of S. macrophylla at the country level.

scholarly journals Effects of Adding Multiwall Carbon Nanotubes on Performance of Polyvinyl Acetate and Urea-Formaldehyde Adhesives in Tropical Timber Species

2015 ◽  
Vol 2015 ◽  
pp. 1-15 ◽  
Author(s):  
Róger Moya ◽  
Ana Rodríguez-Zúñiga ◽  
José Vega-Baudrit
Keyword(s):  
Carbon Nanotubes ◽  
Thermal Stability ◽  
Polyvinyl Acetate ◽  
Urea Formaldehyde ◽  
Multiwall Carbon Nanotubes ◽  
Hydroxyl Groups ◽  
Timber Species ◽  
Tropical Timber ◽  
Tropical Woods ◽  
Multiwall Carbon

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 spectroscopy, the atomic force microscopy (AFM), and transmission electron microscopy (TEM) were used to describe the MWCNTs-OH. The adhesives were evaluated in three concentrations of MWCNTs-OH: 0% (control), 0.05%, and 0.1%. The evaluation included color, the distribution of MWCNTs-OH by TEM and AFM, thermal stability and viscosity of the adhesives, and shear strength (SS) of the glue line for nine tropical woods. AFM and TEM confirmed interaction of MWCNTs-OH with adhesives. The viscosity of the PVAc adhesive increases with added MWCNTs-OH. The incorporation of MWCNTs-OH in PVAc and UF resin produces wood adhesives with less brightness, less yellowness, and increased redness. The nanotubes in the adhesive improved the thermal stability of the composites and increased the entropy factor and energy of activation in the kinetic decomposition of the resin. In relation to SS, MWCNTs-OH in any of the two concentrations had no significant effect on SS in dry condition in half of the species studied glued with PVAc adhesive, whereas, for UF-adhesive, the SS and percentage of wood failure improved in most of the 9 species studied.

scholarly journals Fire resistance properties of some selected tropical timber species from South-western Nigeria after fire exposure

2019 ◽  
Vol 14 (2) ◽  
pp. 61-72
Author(s):  
Oluwaseun Adedapo Adetayo ◽  
Bamidele Ibukunolu Olugbemi Dahunsi
Keyword(s):  
Tectona Grandis ◽  
Strength Properties ◽  
Timber Species ◽  
Fire Exposure ◽  
Tropical Timber ◽  
Moisture Contents ◽  
Percentage Loss ◽  
Temperature Ranges ◽  
Density Values ◽  
Nauclea Diderrichii

AbstractThe research investigated changes in post fire density and strength properties of Nigerian wood species used for construction. The selected species are: Terminalia superba (Afara), Milicia excels (Iroko), Nauclea diderrichii (Opepe), Khaya ivorensis (Mahogany), Mansonia altissima (Mansonia), Tectona grandis (Teak). Densities and strength properties of the species were determined at Moisture Contents (MC) of 9.0, 12.0, and 15.0%. Species were exposed to fire at various temperature ranges. The results revealed that at 9, 12 and 15%MC, Opepe had the highest density values of 630±28.85kg/m³, 686±22.64kg/m³ and 752±17.22 kg/m³ respectively. At 9%MC, Mahogany had the lowest density (439±10.58kg/m³) while at 12 and 15%MC, Afara had the lowest density values of 444±4.18kg/m³ and 469±7.07kg/m³ respectively. Post fire exposure revealed that Afara had the highest percentage loss in density 29.2% and strength properties, while both Iroko and Mahogany exhibited the lowest percentage loss in both density and strength properties.

scholarly journals NATURAL DURABILITY OF SEVEN TROPICAL TIMBER SPECIES IN GROUND CONTACT AT THREE SITES IN MÉXICO

2018 ◽  
Vol 30 (1) ◽  
pp. 75-81
Author(s):  
Colín-Urieta S ◽  
Carrillo-Parra A ◽  
Rutiaga-Quiñones JG ◽  
López-Albarrán P ◽  
Gabriel-Parra R ◽  
...  
Keyword(s):  
Natural Durability ◽  
Timber Species ◽  
Ground Contact ◽  
Tropical Timber

Corrigendum to “Biodeteriorating agents associated with three tropical timber species” [For. Ecol. Manage. 195 (2004) 311–323]

2004 ◽  
Vol 203 (1-3) ◽  
pp. 411
Author(s):  
M.M. Apetorgbor ◽  
N.A. Darkwa ◽  
E. Opuni-Frimpong ◽  
V.K. Agyeman
Keyword(s):  
Timber Species ◽  
Tropical Timber

Isolation and characterization of microsatellite markers in Koompassia malaccensis (Leguminosae), an important tropical timber species

2006 ◽  
Vol 6 (4) ◽  
pp. 1198-1201 ◽  
Author(s):  
C. T. LEE ◽  
S. L. LEE ◽  
Q. Z. FARIDAH ◽  
S. S. SIRAJ ◽  
K. K. S. NG ◽  
...  
Keyword(s):  
Microsatellite Markers ◽  
Timber Species ◽  
Tropical Timber ◽  
Isolation And Characterization

THE THERMAL CONDUCTIVITY OF SELECTED TROPICAL TIMBER SPECIES USING HOT BOX METHOD

2016 ◽  
Vol 78 (5-4) ◽  
Author(s):  
Raihana Mohamad Hata ◽  
Rohana Hassan ◽  
Haslin Idayu ◽  
Fadzil Arshad
Keyword(s):  
Thermal Conductivity ◽  
Heat Flux ◽  
Steady State ◽  
Surface Temperature ◽  
Air Temperature ◽  
Timber Species ◽  
Steady State Condition ◽  
Tropical Timber ◽  
Box Method ◽  
Cold Chamber

In this study, thermal conductivity of selected tropical timber species was determined using hot box method. The test was conducted up until the heat flux, air temperature and surface temperature value at hot and cold chamber of hot box become constant. Each of the selected timber species represent hardwood and softwood as classified in MS 544: Part 2:2011. For this purpose, Chengal (Neobalanocarpus heimii – Dipteracarpaceae), Perupok (Lophopetalum spp. Celastraceae) Nyatoh (Sapotaceae) and Pulai (Alstonia spp. Apocynaceae) were tested. The thermal conductivity test was carried out based on BS EN ISO 8990:1996 standard. The thermal conductivity for Chengal, Perupok, Nyatoh and Pulai under steady state condition are 5.71 x 10-4, 3.595 x 10-4, 2.973 x 10-4 and 3.469 x 10-4 W/m2K respectively. Higher thermal conductivity value is significant with high density of materials.

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