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Dr. Ratih Damayanti
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ratih_turmuzi@yahoo.com
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ejournal_wrj@gmail.com
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Research Center for Biomaterials,Indonesian Institute of Sciences Jl. Raya Bogor Km 46, Cibinong, Bogor 16911, Indonesia
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INDONESIA
Wood Research Journal : Journal of Indonesian Wood Research Society
Published by Masyarakat Peneliti Kayu Indonesia
ISSN : 20873840     EISSN : 27749320     DOI : 10.51850/wrj
Core Subject : Agriculture,
Agriculture, Biological Sciences & Forestry
Wood Research Journal is the official journal of the Indonesian Wood Research Society. This journal is an international medium in exchanging, sharing and discussing the science and technology of wood. The journal publishes original manuscripts of basic and applied research of wood science and technology related to Anatomy, Properties, Quality Enhancement, Machining, Engineering and Constructions, Panel and Composites, Entomology and Preservation, Chemistry, Non Wood Forest Products, Pulp and Papers, Biomass Energy, and Biotechnology. Besides that, this journal also publishes review manuscripts which topics are decided by the Editors.
Arjuna Subject : Ilmu Pertanian dan Biologi (Semua) - Kehutanan
Articles 157 Documents
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Variation of Heartwood Proportion and Wood Colour from Fast Grown 5-Year-Old Teak Ratih Damayanti; Barbara Ozarska; Jugo Ilic; Gustan Pari; Wahyu Dwianto; Dian Anggraini Indrawan; Krisdianto Krisdianto
Wood Research Journal Vol 11, No 1 (2020): Wood Research Journal
Publisher : Masyarakat Peneliti Kayu Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51850/wrj.2020.11.1.1-11

Abstract

The heartwood percentage and wood colour of fast plantation grown teak destined for harvest at 5 years of age were characterized using automatic image processing ’ImageJ’ routines and CieLab’s colour system with the following coefficients: L for lightness, a* for redness and b* for yellowness. Analyses were conducted on material from different dry and wet sites. Comparison with 6-year old plantation from a dry site was conducted to study differences arising in older trees. Analyses of variation of those properties between and within different tree diameter classes were also conducted. The results showed that brightness, redness and yellowness values of 5-year old teak trees were 60.7, 10.7 and 23.1, respectively. Tree clone had a more dominant effect on wood colour and heartwood proportion than site, thus if specific colour preferences are needed of plantation trees, clone selection is important. The drier site produced larger proportions of heartwood in trees, as well as a more attractive figure. The trees produced heartwood proportions of 20% and 14% from the dry and wet sites respectively. On average, these 5 year old teak trees already produced 18% heartwood. Faster tree growth (larger diameter) appeared to have produced significantly larger heartwood proportions. Radially, the palest colour (the highest L but the lowest a*b* parameters) occurred in an area between heartwood and sapwood indicating the presence of a transition zone in all the tree samples. 
Characterization and Antioxidant Activity of Mahogany Bark Extract-loaded Chitosan Nanoparticles Syamsul Falah; Sulistiyani Sulistiyani; Dimas Andrianto
Wood Research Journal Vol 3, No 2 (2012): Wood Research Journal
Publisher : Masyarakat Peneliti Kayu Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51850/wrj.2012.3.2.94-99

Abstract

Nanoparticles-based drug delivery has been recognized to improve the solubility of poorly water-soluble drugs, prolong the half-life of drug systematic circulation by reducing immunogenicity, and releases drugs at a sustain rate. The present study reports on the characterization of mahogany bark extract-loaded chitosan nanoparticles and their antioxidant activity.  Mahogany bark meal was extracted in boiled water for four hours.  Chitosan-sodium tripolyphosphate (STPP) nanospheres were sonicated with ultrasonicator to obtain chitosan-STTP nanocapsules for 30 and 60 min and then were dried with spray dryer. The chitosan-STPP nanocapsules loaded by mahogany extract were then analysed for surface morphology and physical state by scanning electron microscope (SEM) and X ray diffraction (XRD), respectively. Antioxidant activity of the nanoparticles was evaluated by scavenging the 1,1-diphenyl-2-picrylhydrazyl (DPPH) using free radical method. Based on SEM data, the nanoparticle shapes were viewed to adhere to spherical shape. Spherical chitosan-STTP nanoparticles loaded with mahogany bark extract were obtained in the size range of 480 ~ 2000 nm and 240 ~ 1000 nm for 30 and 60 min of ultrasonication time, respectively. The antioxidant activity of the nanoparticles was lower than that of the native mahogany bark extract. 
Relationship between Wood Properties and Developed Drying Schedule of Inferior Teak (Tectona grandis L.F) and Mahogany (Swietenia macrophylla King) Tomy Listyanto; Ganis Lukmandaru; Candra Pramadya; Dwi Siswanto; Nobuaki Hattori
Wood Research Journal Vol 1, No 2 (2010): Wood Research Journal
Publisher : Masyarakat Peneliti Kayu Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51850/wrj.2010.1.2.83-88

Abstract

Development of drying schedule has been a critical issue on a drying process concerning the changing of material condition, especially in Java. Established drying schedule used to be purposed for a high quality timber. The aims of this study were to develop drying schedule of inferior teak and mahogany, and to analyze the relationship between the drying schedule and its wood properties.The specimens were taken from 25 years old teak and 20 years-old mahogany. Wood density, sapwood percentage and extractive contents were determined as wood properties. Four types of specimen’s dimensions (25 x 30 mm; 25 x 50 mm; 25 x 100 mm; and 50 x 50 mm) were dried in the oven with temperature of 103⁰C until reach oven dried conditions.  Levels of checks, collapse, and honeycomb were observed to develop drying schedule. A Chi square analysis was used to analyze the relationship between wood properties and the drying schedule.The results showed that there were four types of drying schedule are applicable for teak and five types for mahogany. The most recommended schedule for teak sample was the schedule with an initial temperature (IT) was 70⁰C, relative humidity (RH) was 71%, and the final temperature (FT) was 90⁰C, while the mahogany wood was the schedule with an IT 60⁰C, RH 81%, and the FT 85⁰C, respectively. Chi square analysis indicated that the mahogany lumber dimension was significantly related to the schedule development while specific gravity, heartwood percentage, and extractive content had no significant relationship with the drying schedule development. 
Furfuryl Alcohol Treatment of Bamboo Betung (Dendrocalamus asper Backer ex K. Heyne) Strips Krisdianto Krisdianto; Peter Vinden; Simon Prezwloka
Wood Research Journal Vol 10, No 1 (2019): Wood Research Journal
Publisher : Masyarakat Peneliti Kayu Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51850/wrj.2019.10.1.11-17

Abstract

Based upon  successful chemical modification of  wood, bamboo strips  were subjected to  furfurylation treatment. Furfurylation in the mean of impregnating furfuryl alcohol to the bamboo and then heated at 100°C for 24 hours to produce solid polymeric resin. The success of furfurylation is assessed by uptake and the weight percentage gain of furfurylated bamboo strips. However, the treatability of dry bamboo strip is relatively poor. This paper studies the furfurylation process of bamboo betung (Dendrocalamus asper Backer ex K.Heyne) strips by soaking, vacuuming and the combinations thereof. Results showed that soaking bamboo strips for two days after vacuum treatment achieved optimum uptake of furfuryl alcohol solutions and gave rise to an 80% weight gain. Catalyst addition during furfurylation did not increase the weight percent gain. Water was an active solvent carrier for achieving higher weight gains
Characteristic of Bamboo Particleboard Bonded with Citric Acid Ragil Widyorini; Ari Puspa Yudha; Yuditya Adifandi; Kenji Umemura; Shuichi Kawai
Wood Research Journal Vol 4, No 1 (2013): Wood Research Journal
Publisher : Masyarakat Peneliti Kayu Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51850/wrj.2013.4.1.31-35

Abstract

Converting biomass waste to high value-added product, such as biocomposite, tends to attract the interest of researcher and industry. Reducing the utilization of synthetic resin adhesives becomes one of the important points, considering the safe global environment. Binderlessboard is a product whose bonding depends mainly on the chemical composition of the raw materials. The aim of this research was to develop bio-based composites made from bamboo biomass waste materials. This report focused on the physical and mechanical properties of the particleboards. To improve the properties of the boards, the possibility of using citric acid was investigated and discussed. Petung bamboo particles (Dendrocalamus asper Backer) were used in this research. The contents of citric acid were ranged in 0% (binderlessboard), 10%, and 20% based on dried particles. The dimension of the boards was 25 x 25 x 0.7 cm, with the target density was 0.9 g/cm3. The particleboards were hot pressed at 200ºC and 220ºC for 10 and 15 min. The physical and mechanical properties of those particleboards were then evaluated based on Japanese Industrial Standard A 5908 for particleboard. The results showed that the physical and mechanical properties of the boards improved significantly by adding the citric acid. The bamboo particleboards obtained had good properties, with the spesific IB, specific MOR and specific MOE values under the optimum condition of 20 wt % citric acid content and 200ºC hot press were 0.44 MPa, 15.1 MPa and 4.6 GPa, respectively. It stated that bamboo particleboards bonded using citric acid had high performance on mechanical properties and good dimensional stability.
Formation of SiC Rods in Composites of SiC/SiO2/C from Carbonized Wood Infiltrated with Ethylsilicate-40 Joko Sulistyo; Toshimitsu Hata; Sri Nugroho Marsoem
Wood Research Journal Vol 2, No 1 (2011): Wood Research Journal
Publisher : Masyarakat Peneliti Kayu Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51850/wrj.2011.2.1.34-41

Abstract

Silicon carbide rods were formed in composites of silicon carbide/silicon dioxide/carbon (SiC/SiO2/C) from carbonized wood impregnated with ethyl silicate-40 after heat treatments using a pulse current apparatus. The effect of reaction temperatures, heating rates and pressures on the SiC rods formation was investigated. Raman spectroscopy indicated that the SiC rods possessed well crystalline. The SiC rods in the composites prepared at 1200 and 1400°C exhibited straight structure with smooth surfaces. The increase of reaction temperature up to 1600°C increased the length and diameter of SiC rods which exhibited a camelback-type structure. Different heating rate only determined the length of SiC rods grown; meanwhile the increase of pressure from 0 to 15 MPa increased the length and diameter of SiC rods grown.
Pore Size Distribution and Microstructure of Oil Palm Shell Heat Treated at 300 C Followed by Slow or Fast Heating Treatment Joko Sulistyo; Toshimitsu Hata; Yuji Imamura; Purnomo Darmaji; Sri Nugroho Marsoem
Wood Research Journal Vol 9, No 1 (2018): Wood Research Journal
Publisher : Masyarakat Peneliti Kayu Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51850/wrj.2018.9.1.15-25

Abstract

Pore size distribution and microstructure development of oil palm shell heat treated at 300ºC and treated at 300ºC and recarbonization at 600ºC followed by slow- or fast heating treatment up to 700ºC were investigated by small angle X-ray scattering (SAXS), N2 gas adsorption and Raman spectroscopy. On oil palm shell heat-treated at 300ºC, slow heating treatment gave the widening micropore along with the ordering microstructure; but fast heating treatment produced charcoal with a narrow diameter of micropore with wider pore size distribution and the disordering microstructure. On oil palm shell heat treated at 300ºC and recarbonization at 600ºC, slow heating treatment contributed on the opening new micropore with ordering microstructure, but some parts of micropore showing inaccessible for N2 gas. Meanwhile, fast heating treatment with the heating rate from 75 to 250ºC/min increased BET surface area with similar pore size distribution and the disordering microstructure.
Effect of Hole Diameter and Drying Condition on Shrinkage and Defect of Sugi (Cryptomeria japonica D. Don) Wood in Convective Air Dryer Yustinus Suranto; Kazuo Hayashi
Wood Research Journal Vol 2, No 2 (2011): Wood Research Journal
Publisher : Masyarakat Peneliti Kayu Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51850/wrj.2011.2.2.%p

Abstract

Sugi wood containing pith in the centre of specimen has a very low drying ability and very easy to suffer a defect due to drying on convective dryer. Trunk of sugi trees grown artificially in Matsuyama forest district were cut longitudinally to some rectangular samples in dimension of 12.3 cm x 12.3 cm x 1.5 cm (length). Every six of samples were grouped in one group. The first unit of the sample in every group was intended to measure initial moisture content and another five units of the samples  were subjected to treatment in a hole in the center of the sample with a diameter’s dimension of 0 cm, 2.46 cm, 3.075 cm, 4.1 cm and 6.15 cm respectively. The first until the ninth  group were dried in air convective dryer with temperature of 50°C and relative humidity of 80%, while the tenth until the nineteenth group were dried at temperature of 80°C and relative humidity of 87%. Every stage of drying, each of the samples was weighted and measured for tangential and radial shrinkage as well as length of crack. Data was analyzed using completely randomized design in a factorial arrangement.The result showed that the smaller hole diameter and the higher drying condition, the lower  final moisture content, the higher tangential shrinkage, the higher radial shrinkage and the longer of the total crack.
Characterization of Cuticle Layer of Ilex latifolia Jun-ichi Azuma; Shuntaro Tsubaki; Rike Yudianti; Myrtha Karina
Wood Research Journal Vol 1, No 1 (2010): Wood Research Journal
Publisher : Masyarakat Peneliti Kayu Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51850/wrj.2010.1.1.56-63

Abstract

Cuticular membranes were isolated from the upper and lower surfaces of Ilex latifolia leaves and their morphological, chemical compositional and mechanical properties were characterized.  The upper cuticular membrane contained 18.6% wax, 53.5% cutin and 17.5% cutan with low contaminating carbohydrates (10.4%), while the lower cuticular membrane had the values of 17.9%, 49.2%, 15.8% and 17.1%.  Both membranes were rich in aliphatic CH2 groups, and the main monomer of the cutin in the upper cuticular membrane was 9(10),18-dihydroxyhexadecanoic acid while 9,10,18-trihydroxyoctadecanoic acid in the lower membrane. Mechanical analyses indicate clear orientation differences in breaking stress and strain between the two membranes with higher breaking stress in the upper cuticular membrane and in the longitudinal direction parallel to the midvein. Additive such as a cellulosic hydrogel from Salvia viridis to make a composite influenced the mechnical properties of the cuticular membranes. Mechanical properties of the isolated cuticular membranes may be more influenced by their morphological properties than chemical compositions; thick and smooth structure of the upper cuticular membrane, while wrinkled and scattered stoma-rich structure of the lower cuticular membrane.
Strength and Stiffness Behavior of Earthquake Resistant Pedestrian LVL Timber Bridge Bernardinus Herbudiman; Delima Delima; Yosafat Aji Pranata
Wood Research Journal Vol 11, No 2 (2020): Wood Research Journal
Publisher : Masyarakat Peneliti Kayu Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51850/wrj.2020.11.2.53-57

Abstract

A bridge is a structure which is used to connect two areas separate by obstacles. The environmental damage caused a number of reductions in the production of timber, and by that, the LVL timber which is a high quality processed or engineered timber is chosen. This research determined the design of the timber bridge structure for pedestrian with simple beam type and earthquake resistant. The load in this bridge is referring to the SNI 1725:2016 and SNI 2833:2008, the design of the girder and the connection is referring to SNI 7973:2013, and the deflection is referring to the LFRD for Highway Bridge Superstructures. The timber bridge is designed to have a span of 10 metres long and 3 metres wide. The modeling and designing of the wooden bridge are using an application called SAP2000 based on finite element analysis. Result obtained from this research indicated that the longitudinal dimension of the girder is 360 mm x 630 mm and the cross sectional dimension is 180 mm x 270 mm. The number of bolts and lock screws needed on the connection among the longitudinal girders are 40 pieces, between the longitudinal girders and the cross sectional girders is three pieces, and between the railing and the slab are two pieces. Based on the stiffness review, the results showed that the bridge deflection that occurred was lower than the permit deflection

Page 7 of 16 | Total Record : 157

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