ORCID Profile
0000-0002-5482-9514
Current Organisation
National Research and Innovation Agency
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Publisher: IOP Publishing
Date: 03-2020
DOI: 10.1088/1755-1315/460/1/012015
Abstract: Eucalyptus pellita is usually harvested at young age for pulp and paper production. Therefore, it’s wood quality needs to be improved when it is used for construction. One of which is through its conversion into laminated products. Nevertheless, several factors are assumed to influence the final quality of laminated products, i.e pre-drying temperatures used to prepare the s les and the adhesives types used. This paper aims to investigate the effect of both factors on the bending properties and shear strength of glued Eucalyptus pellita boards. The Pellita boards were exposed to 2 drying temperatures (50°C and 60°C) and further laminated by using 2 tannin-based adhesives (made from the mahogany and oil palm bark extracts). The results showed the modulus of elasticity (MOE) and modulus of rupture (MOR) of the glued boards with mahogany-tannin adhesives were, respectively, 33,333.15-39,160.15 kg/cm 2 and 214.30-640.77 kg/cm 2 higher than the boards laminated with the oil palm wood tannin adhesives. Nevertheless, the oil palm tannin adhesives improved the shear strength of laminated Pellita, approximately 15.06-16.45 kg/cm 2 higher than the boards laminated with mahogany-tannin adhesives. A further statistical test showed the tannin-types used for adhesives, and not the drying temperatures, that significantly affected the investigated mechanical properties of glued Pellita boards.
Publisher: IOP Publishing
Date: 12-2019
DOI: 10.1088/1755-1315/399/1/012105
Abstract: Molucca, a region which is located in the eastern part of the Indonesia Region, is a wet tropical forest type. The ersity of tree species in this area is high. Nevertheless, up to now, only a few species, i.e ramin ( Gonystylus bancanus ), have been considered to have high economic value which categorized as fancy wood for the imposition of forestry fees. This paper presents the results of the study of some basic properties and potential uses of 35 wood species growing in Molucca’s forest. The study was carried out by reviewing secondary data collected from related literatures intensively. The results show that of the 35 species, nyatoh putih ( Pouteria duclitan ), sesendok (Endospermum malaccense ), nyaling ( Mastixia trichotoma ), and gopasa ( Pouteria duclitan ) have similar physical and mechanical properties, as well as decorative appearance with ramin wood. Therefore, these 4 species are considered as potential ramin’s substitute. The four species are also proposed to be included in the category of the fancy wood class instead of the ordinary mixed-species group. As a further impact, the imposition of forestry fees for the 4 species needs to be reviewed and readjusted.
Publisher: IOP Publishing
Date: 06-2022
DOI: 10.1088/1755-1315/1034/1/012010
Abstract: Dragon blood’s resin is one of herbal commodities from Indonesia’s forest, mainly obtained from the rattan fruits called Jernang ( Daemonorops sp). The effectiveness of its simplicia as medical material is affected by, one of which, the processing stages it exposes to, i.e. the drying techniques being applied. Intermittent drying is a drying technique combining heating phase at certain temperature and period with non-heating phase at ambient temperature and certain period. The cycle was alternated until the s les being dried reach the final target condition. This study particularly investigated the effect of implementing different intermittent drying conditions on the drying rate and quality of dragon’s blood resin. Three heating temperatures, 60°C, 55°C and 55/60°C, and 2 non-heating periods, 15 and 30 mins, were applied. A 1-hour heating phase was applied and alternated regularly with the non-heating period. c. Further statistical analysis confirmed that the heating temperature levels and non-heating periods, as well as their interaction, significantly affected several quality parameters of dragon blood’s resin (dracorhodin, final moisture, ash and impurity levels). Intermittent drying with heating phase at 60°C and 15-mins non-heating period is potential for further application.
Publisher: Asosiasi Peneliti dan Teknisi Kehutanan dan Lingkungan Hidup Indonesia
Date: 30-04-2020
Publisher: Springer Science and Business Media LLC
Date: 21-02-2018
Publisher: Informa UK Limited
Date: 02-01-2022
Publisher: Forest Research Institute Malaysia
Date: 26-01-2022
DOI: 10.26525/JTFS2022.34.1.74
Abstract: The study aimed to investigate the effect of thermal compression on the properties of 8-year-old waru gunung wood. Wood specimens with the dimension of 25 mm100 mm150 mm in thickness, width and length, respectively were heated at 180 ˚C and 200 ˚C for 4 h. During the heating process, the specimens were subsequently compressed at 2.452 N mm−2 for 40 mins at each temperature. Changes in the wood chemical structure were examined using the pyrolysis-gas chromatography-mass spectrometry, the wood physical properties were tested according to ASTM D143-94, the wood surface hardness was tested using a Universal Testing Machine and the wood discoloration was examined using the CIELab method. The changes in crystallinity degree was examined using x-ray diffraction and cell structure were collected as supporting data. Results showed that the thermal compression at 180 ˚C and 200 ˚C caused severe degradation on the specimen carbohydrate but less for lignin. The sum effect of thermal compression on the specimens also consecutively increased the density by 34.24% and 41.87% and surface hardness by 52.78% and 63.09% and decreased the swelling thickness by 38.54% and 47.03% and the equilibrium moisture content by 36.53% and 38.59% at 180 ˚C and 200 ˚C, respectively. Thermally compressed specimens also had darker colours, glossier surfaces and smoother texture compared to non-thermally compressed specimens.
Publisher: IOP Publishing
Date: 09-2020
DOI: 10.1088/1757-899X/935/1/012020
Abstract: Mangium ( Acacia mangium ) has been opted as one of potential species for the establishment of industrial timber estate in Indonesia, particularly to support the production of pulp and paper. In order to obtain mangium stands that produces high quality wood, one attempt can be carried out through the selection and development of potential mother trees from the selected provenances. This study aim to obtain information on fiber dimension and the anatomy of mangium wood from two different mother trees from Papua New Guinea provenance. The wood was collected from mangium estate in Wonogiri forest research which was established in 2012 and managed by the Center Forest Biotechnology and Tree Improvement. Maceration process followed Forest Product Laboratory guidance and the preparat preparation followed Sass method. The wood anatomical terminology referred to IAWA (International Association of Wood Anatomists) list of microscopic features for hardwood identification was used to scrutinize the s les. The results showed that the average fiber dimension of mangium from the mother tree group 1 was 1239 micron (length), 25.96 micron (fiber diameter), and 3.67 micron (cell wall thickness). Those from the mother tree group 2 posseses the dimension as follow: 1215 micron (length), 25.42 micron (fiber diameter), and 3.73 micron (cell wall thickness). The fiber quality of mangium fiber from both mother tree groups could be considered in the quality class II. The anatomical structure of mangium from both mother tree groups include vessels cells in radial multiples radial multiple of 2-3 or 4 cells vestured intervessel pits parenchyma vascicentric and aliform all ray cells procumbent and prismatic crystals in chambered axial parenchyma cells.
Publisher: IOP Publishing
Date: 09-2020
DOI: 10.1088/1757-899X/935/1/012045
Abstract: Activated carbon prepared from Gigantochloa robusta was studied to reduce Chemical Oxygen Demand (COD) levels in pharmaceutical-liquid waste. Physical activator was used to produce Activated Carbon (AC) in temperature regulation of 750°C retort for 60 minutes. Dosage of AC powder were 0.25%, 0.5%, and 0.75% of 250 mL of pharmaceutical waste, respectively. Retention time variations of 30, 60, and 90 minutes were used in laboratory scale experiments. Proximate analysis including volatile substances, water content, ash content, fixed carbon and I2 adsorption were observed to characterize AC. This research shows that the produced AC successfully meets the SNI 06-3730-1995 standards. The study results show variations in COD removal between 9-23%. The best result was performed by the AC dosage of 0.75% over a 60 minutes retention time.
Publisher: Elsevier
Date: 2018
Publisher: IOP Publishing
Date: 11-2021
DOI: 10.1088/1755-1315/914/1/012058
Abstract: Dragon blood’s resin is obtained by extracting the dragon blood’s fruit with organic or non-organic solvents. Following extraction, drying process is usually carried out to dry the wet resin. The drying techniques used is assumed to affect not only the drying performance but also the quality of the dragon blood’s resin, in particular its active ingredient content (dracorhodin). The purpose of this study was to measure and compare the effect of solar and oven drying on the drying performance and quality of dragon blood’s resin. The oven temperature used was 60°C. Both drying techniques were executed until the resin dried which was indicated by color change and its easiness to rupture. The results showed that solar drying of dragon blood required shorter time (210 minutes) with higher drying rate (0.25%/minute) than the oven drying process which need 250 minutes to finish with a drying rate of 0.14%/minute. Except the ash content of solar dried resin, other post-drying quality parameters of dragon blood resin from both drying techniques have met the Indonesia standard for trading purpose (SNI 8663:2018). Further statistical analysis confirmed that the drying techniques applied significantly affected the drying rate and post-drying quality values of dragon blood’s resin.
Publisher: Forest Research Institute Malaysia
Date: 02-2019
Location: Indonesia
No related grants have been discovered for KARNITA YUNIARTI.