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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Wood Science and Technology
Journal Basic Information
Journal DOI :
The Korean Society of Wood Science Technology
Editor in Chief :
Volume & Issues
Volume 34, Issue 6 - 00 2006
Volume 34, Issue 5 - 00 2006
Volume 34, Issue 4 - 00 2006
Volume 34, Issue 3 - 00 2006
Volume 34, Issue 2 - 00 2006
Volume 34, Issue 1 - 00 2006
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Anatomy of Quercus variabilis Charcoal Manufactured at Various Temperatures
Kim, Nam-Hun ; Gwon, Gu-Jung ; Gwon, Seong-Min ; Hwang, Won-Jung ; Lee, Seong-Je ;
Journal of the Korean Wood Science and Technology, volume 34, issue 4, 2006, Pages 1~8
Anatomy of Quercus variabilis charcoal was investigated by scanning electron microscopy. Charcoal was prepared in an electric furnace under nitrogen gas atmosphere at 400oC, 600oC, 800oC, and 1000oC for 10 min. The structure of charcoal was significantly affected by charring temperature. In cross section, charcoal prepared at 400oC exhibited a smooth clean surface. As the charring temperature increased, the surface became more rough and increasingly disrupted. The cell walls appeared homogeneous and glass-like. Ray parenchyma cells showed very little separation from each other in radial section at 400oC. At 600oC and above there is an apparent disintegration of the middle lamella, resulting in a separation of the ray cells. The 2～4 µm wart-like protuberances were observed on the surfaces of the parenchyma cells. These structures were seen in charcoal prepared at all temperatures. Distinctive features can be seen in multiseriate rays as large crack and split. Rhomboidal crystals in crystalliferous cells had a smooth surface at 400oC and 600oC, but the crystals had a sponge like appearance at 800oC and 1000oC.
PEG Distribution in the Cell Walls of PEG-treated Woods using SEM-EDS
Gwon, Gu-Jung ; Kim, Nam-Hun ;
Journal of the Korean Wood Science and Technology, volume 34, issue 4, 2006, Pages 9~14
This study was carried out to investigate the distribution and penetration of PEG molecules into the cell wall of wood by SEM-EDS method. SEM observation indicated that the cell walls of PEG-treated specimen were swollen, and didn’t show any change in their shapes, while the cells of untreated specimen were more or less collapsed. The results of X-ray analyses of potassium stained samples revealed the distribution of the impregnated chemicals within the cell walls, when considering the distribution of potassium ions in the cell walls. Consequently, this study supported the possibility of PEG molecules penetrated into the wood cell wall play an important role in enhancing the dimensional stability of wood.
A Study on the Basic Properties of Wood Impregnated with Inorganic Compounds
Kim, Geon-Hyeong ; Lee, Won-Hui ; O, Tae-Gyeong ;
Journal of the Korean Wood Science and Technology, volume 34, issue 4, 2006, Pages 15~21
Composite materials were prepared by impregnating water glass into the wood, followed by soaking in solutions of boric acid or phosphoric acid. The effects of these treatments on the physical and mechanical properties of the specimens and especially on its heat resistance were investigated. 1) Weight Percent Gain (WPG)s increased with increase of concentrations of water glass. However, there was little relationship between treatment temperatures and WPG. Generally, WPGs of double treated specimens were higher than single treated ones. 2) Percent shrinkages in each directions of the specimens treated with water glass had higher value than other specimens. Percent shrinkages of the specimens treated with boric acid or phosphoric acid were decreased as compared with untreated specimen. However, the specimens treated with water glass or phosphoric acid showed very high hygroscopicity. 3) The bending strengths of all specimens treated inorganic substances were slightly decreased. However, the values of compressive strength and hardness of most specimens treated with inorganic substances increased or similar to that of untreated specimen except for a phosphoric acid treated specimens. 4) The specimens had good heat resistance. Weight losses of all specimens treated inorganic substances were about 50～70%. In particular, the specimens treated at 300oC and 400oC almost kept their shapes.
Development of Test Method using VOC Analyzer to Measure Volatile Organic Compound Emission for Particle Board
An, Jae-Yun ; Kim, Hyeon-Jung ; Kim, Su-Min ; Kim, Jin-A ; Mun, Seok-Jung ;
Journal of the Korean Wood Science and Technology, volume 34, issue 4, 2006, Pages 22~30
The volatile organic compound (VOC) Analyzer is a portable device to measure the four main aromatic hydrocarbon gases: toluene, ethylbenzene, xylene and styrene. With the VOC Analyzer, a semiconductor gas sensor eliminates the need for the carrier gas which is required for conventional gas chromatographs. In addition, since the semiconductor gas sensor is supersensitive to gas components, it is not necessary to use a conventional gas concentrator or other complicated equipment. Compared with other measurement methods, the VOC analyzer is useful for measuring toluene, ethylbenzene, xylene and styrene in wood-based panel because of its ease in obtaining field results and repeating the test. The VOC Analyzer primarily measures four VOC in the air. In this study, we designed a test method of VOC measurement for particle board. A specimen was sealed in 3L polyester bag, after 96hours we could measure maximum VOC emission level that is a stabilized VOC Value. For easy, fast and economic testing of TVOC emission from wood-based panel, we developed the test method with the VOC Analyzer. The VOC Analyzer is expected to gain widespread use in the manufacturing field where a quick and easy test for VOC emission from wood-based panel is required. Furthermore, the VOC Analyzer promises to become an easier, faster and more economic technique than the currently used standard methods.
Effects of Blending Fatty Acid-Glycerol-pMDI with Urea-Formaldehyde Resin Adhesives to Their Adhesion for the Use of Soybean Oil
Yu, Yeong-Sam ; Seo, Jun-Won ; Park, Heon ; Choe, Jin-Rim ;
Journal of the Korean Wood Science and Technology, volume 34, issue 4, 2006, Pages 31~36
This study was conducted to improve the bond strength of plywood bonded with F/U molar ratio urea-formaldehyde (UF) resins modified with the selected FGMDI prepolymer contents for various purposes. The amount of FGMDI was mixed with liquid UF resin at 0 wt% (as control), 2 wt%, 5 wt%, 10 wt%, 25 wt%, and 50 wt% based on the resin solids. As results, in bonding strength, plywood with F/U molar ratio of 1.4 showed the highest value in Type 2 test and all molar ratio UF resins modifiedwith over 25 wt% of the FGMDI showed more than 11 kgf/cm2, which was satisfied the minimum requirement of KS standard, 7.5 kgf/cm2, after Type1.5 testing. As F/U molar ratio was increased and the FGMDI addition in the UF resin was increased, average reduction rate of Type 1.5 bonding strength compared with Type 2 was significantly decreased.
Heavy Metals of Landfilled Biomass and Their Environmental Standard, Including CCA-treated Wood for Eco-housing Materials
Im, Gi-Pyo ; Lee, Jong-Tak ; Beom, Jeong-Won ;
Journal of the Korean Wood Science and Technology, volume 34, issue 4, 2006, Pages 37~45
Screening of Wood-Rot Fungi Based on RBBR Decolorization and Its Laccase Activity
Choe, Yun-Jeong ; Jo, Nam-Seok ; Sin, Yu-Su ;
Journal of the Korean Wood Science and Technology, volume 34, issue 4, 2006, Pages 46~53
This study was to screen white-rot fungi possesing strong lignin degrading enzymes, glucose-1 oxidase (GOD), laccase (LAC) and Mn-peroxidase (MnP), based on their decolorization activity of Remazol Brilliant Blue R (RBBR). In the midst of 20 tested fungi, 9 isolates were shown 4 kinds of activities such as RBBR decolorization, GOD, LAC and MnP. Relatively high active strains were identified as Phlebia radiata, Trametes versicolor, Abortiporus biennis, Gleophyllum odoratum and Cerrena unicolor. In particular, T. versicolor, G. odoratum, and C. unicolor, which have high activities of LAC, were used to confirm the optimal temperature and pH and to evaluate the effect of inducer, 2,5-xylidine on their LAC activity. The optimum temperatures for mycelial growth were 28oC for T. versicolor and G. odoratum, and 25oC for C. unicolor. The optimum pH for mycelial growth was 5.5. Three strains showed the increase of LAC enzyme activity by the addition of 2,5-xylidine. T. versicolor had the highest LAC activity of 22,700 nkat/ℓ, corresponding to 11.3 times, G. odoratum 15,400 nkat/ℓ, 9 times and C. unicolor 17,330 nkat/ℓ, 5.5 times higher than those of the control.
Biomass and Energy Content of Quercus mongolica Stands in Gwangyang and Jeju Areas
Gwon, Gi-Cheol ; Lee, Don-Gu ;
Journal of the Korean Wood Science and Technology, volume 34, issue 4, 2006, Pages 54~65
This study was conducted to examine the biomass and energy content of 60- to 70-year-old Quercus mongolica stand facing northern and southern aspect in Mt. Baekwoon (800 m above sea level), Gwangyang, Jeollanam-do and in Mt. Halla (1,000 m above sea level), Jeju-do. The total biomass was 288.4ton/ha in northern aspect and 241.9 ton/ha in southern aspect of Mt. Baekwoon while 368.4 ton/ha in northern aspect and 364.3 ton/ha in southern aspect of Mt. Halla. Annual net production was 20.7 ton/ha/yr in northern aspect and 17.7 ton/ha/yr in southern aspect of Mt. Baekwoon while 19.0 ton/ha/yr in northern aspect and 21.2 ton/ha/yr in southern aspect of Mt. Halla. Total biomass and annual net production of Mt. Halla were greater than those of Mt. Baekwoon. The net assimilation rate (NAR) was 5.05 in northern aspect and 4.09 in southern aspect of Mt. Baekwoon, while 4.60 in northern aspect and 3.66 in southern aspect of Mt. Halla, Total energy content was 5,666 GJ/ha in northern aspect and 4,793 GJ/ha in southern aspect of Mt. Baekwoon while 6,550 GJ/ha in northern aspect and 6,435 GJ/ha in southern aspect of Mt. Halla. Annual energy content was 365 GJ/ha/yr in northern aspect and 360 GJ/ha/yr in southern aspect of Mt. Baekwoon while 351 GJ/ha/yr in northern aspect and 347 GJ/ha/yr in so
Biomass and Energy Content of Pinus koraiensis Stand Planted in Mt. Wolak
Gwon, Gi-Cheol ; Lee, Don-Gu ;
Journal of the Korean Wood Science and Technology, volume 34, issue 4, 2006, Pages 66~75
This study was conducted to understand the biomass and the energy content of 24-year-old Pinus koraiensis stand planted in Mt. Wolak, Chungcheongbuk-do, Korea. Nine sample trees were selected and harvested for the study. Stem, bark, branches and leaves were weighed respectively with the stratified clipping method, and analyzed for productive structure. The allometric regression equations between dry weight of each component and D2H were obtained to estimate the total biomass of aboveground (47.0 ton/ha) and other parts (56.5% from stemwood, 9.1% from stembark, 0.5% from current twigs, 18.4% from live branches, 2.6% from current leaves, and 12.9% from previous leaves). Annual net production of aboveground was 6.0 ton/ha/yr, and the ratios of stemwood, stembark, current twigs, live branches, and current leaves to that of aboveground were 49.8%, 7.3%, 3.5%, 18.6%, and 20.8%, respectively. Energy content of aboveground was 1,028 GJ/ha, and annual energy content was 133 GJ/ha/yr. Leaf area index (LAI) of P. koraiensis plantation was 20.2 in Mt. Wolak.
A Study on the Extractives of Domestic Major Softwood Needles (II)*1 - Antioxidant Activity of the Extractives from the Needles of Chamaecyparis pisifera (Sieb. et Zucc.) Endlicher -
Lee, Sang-Geuk ; Bae, Yeong-Su ;
Journal of the Korean Wood Science and Technology, volume 34, issue 4, 2006, Pages 76~82
The dried ground needles (2.0 kg) of Chamaecyparis pisifera (Sieb. et Zucc.) Endlicher were extracted with acetone-H2O (7:3, v/v), concentrated, and fractionated with a series of n-hexane, methylene chloride, ethyl acetate and water on a separation funnel. Each fraction was freeze dried, then a portion of ethyl acetate soluble powder was chromatographed on a Sephadex LH-20 column using a series of aqueous methanol and ethanol-n-hexane mixture as eluents. The isolated compounds were identified by cellulose TLC, 1H-, 13C-NMR, COSY, HETCOR, FAB and EI-MS. (+)-catechin, taxifolin-3-O-β- D-xylopyrano-side, quercetin-3-O-α-L-rhamnopyranoside were isolated from the ethyl acetate soluble fraction of Chamaecypairs pisifera needle. Antioxidative tests on the isolated compounds indicated that all of the compounds showed similar values to α-tocopherol and BHT as controls.