KARLINASARI, Lina, Indonesia

  • Jurnal Ilmu dan Teknologi Hasil Hutan Vol. 2 No. 1 (2009): Jurnal Ilmu Teknologi Hasil Hutan - Articles
    The aim of this study was to evaluate dynamic modulus of elasticity (MOEdyn) of woods after tested those natural durability. Field tests by grave yard test were applied to prove the natural durability of jackfruit and mangium woods in ground contact. The method of non-destructive testing based on ultrasonic wave propagation was carried out to define ultrasonic velocity than that used for evaluating MOEdyn. The result showed that ultrasonic velocity of jackfruit and mangium woods decreased 3% and 0.5%, respectively after field test. There was a significant difference of MOEdyn value between before and after natural durability testings
    Abstract  PDF
  • Jurnal Ilmu dan Teknologi Hasil Hutan Vol. 4 No. 1 (2011): Jurnal Ilmu Teknologi Hasil Hutan - Articles

    Pangsor (Ficus callosa WILLD) and kecapi (Sandoricum kucape MERR) are usually planted in garden and rural forest. The objective of this study was to determine its specific gravity (SG), maximum crushing strength (σc//), longitudinal modulus elasticity (EL), and Poisson’s ratio (n).  The compression test  was conducted referring to  ASTM D143-94(2000) using UTM Instron 3369 which is equipped with two biaxial clip on extensometers.  The result showed that vertical and horizontal position of wood in the trees statistically significant influenced on SG and σc//.  Horizontal position in Pangsor wood affected its EL, but the other position in both species were not significantly different.  There were poor correlations between SG with EL and σc//.   Poisson’s ratio value of both woods were in a range 0.0045 – 0.275 for longitudinal-radial direction (nLR), and 0.0151 – 0.1289 for longitudinal-tangensial direction (nLT).

     

    Keywords :    Longitudinal Modulus of Elasticity, Maximum Crushing Strength, Poisson’s Ratio, Pangsor wood, Kecapi wood


    Abstract  PDF
  • Jurnal Ilmu dan Teknologi Hasil Hutan Vol. 4 No. 1 (2011): Jurnal Ilmu Teknologi Hasil Hutan - Articles

    The use of modern devices and human activity today have increased noise problem. The applicaton of acoustic panels in building construction could be as an alternative to overcome this problem. The purpose of this study was to investigate acoustical properties of sound absorption coefficient and sound transmission loss from wood wool or excelsior board. Three fast growing species, sengon (Paraserianthes falcataria), african wood (Maesopsis eminii), and mangium (Acacia mangium) lumbers were processed to obtain wool particles. Two different categories of board density and types of resins were used in this study. Sound absorption coefficient was determined using the impedance tube method, while that for the determination of transmission loss based on the reverberation room method. The results showed that the board density of 0.8 g/cm3 had good sound absorption for low and high frequencies compared with board of 1.0 g/cm3. In the medium frequencies those boards reflected the sound. Wood wool cement bonded board was good in sound absorption for high frequency. In the range low to high frequencies, the boards with isocyanate adhesive were good in transmission loss value compared with cement bonded boards. Meanwhile, the boards with density of 1.0 g/cm3 possessed transmission loss value higher than board of 0.8 g/cm3.

     

    Keywords:     acoustic panel, wood wool board, fast growing species, sound absorption, transmission loss


    Abstract  PDF