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チョウリンカイ ニサンカ タンソ オ リヨウシタ モクシツ ザイリョウ ノ シンキ ホゾン ショリホウ
No full text京都大学0048新制・課程博士博士(農学)甲第10260号農博第1332号新制||農||867(附属図書館)学位論文||H15||N3781(農学部図書室)UT51-2003-H681京都大学大学院農学研究科森林科学専攻(主査)教授 今村 祐嗣, 教授 川井 秀一, 助教授 角田 邦夫学位規則第4条第1項該当Doctor of Agricultural ScienceKyoto UniversityDA
Physical, Mechanical, and Biological Properties of Silafluofen-treated Tropical Wood Using Multi-Phase Carbon Dioxide Impregnation
Get PDFA new approach in wood preservative treatment using carbon dioxide (CO2) as a carrier solvent has been developed\ud
and evaluated its effect on the physical, mechanical, and biological properties of treated tropical wood. It employs CO2 at\ud
various combinations of temperatures and pressures in a treatment vessel at once and is called Multi-Phase Carbon\ud
Dioxide (MPCO2) treatment. Three commercial tropical wood species (Agathis sp., Palaquium sp., and Heritiera sp.)\ud
measuring 1.5 cm (T) x 1.5 cm (R) x 15 cm (L) were prepared for the treatment with a termiticide (silafluofen). A treatment\ud
cycle was performed by loading two specimens of each wood species, applying the temperature of 15??C and pressure of\ud
60 kg/cm2, gradually increasing the temperature and pressure, respectively, to 35??C and 80 kg/cm2, and releasing the\ud
pressure to atmosphere. The treatment was conducted with five replicates. Untreated and treated specimens were then\ud
evaluated their physical, mechanical, and biological properties. Results show that the MPCO2 treatment significantly\ud
enhanced the termite resistance of treated wood without any adverse effects on their physical and mechanical properties
Physical, Mechanical, and Biological Properties of Silafluofen-treated Tropical Wood Using Multi-Phase Carbon Dioxide Impregnation
No full textA new approach in wood preservative treatment using carbon dioxide (CO2) as a carrier solvent has been developed and evaluated its effect on the physical, mechanical, and biological properties of treated tropical wood. It employs CO2 at various combinations of temperatures and pressures in a treatment vessel at once and is called Multi-Phase Carbon Dioxide (MPCO2) treatment. Three commercial tropical wood species (Agathis sp., Palaquium sp., and Heritiera sp.) measuring 1.5 cm (T) x 1.5 cm (R) x 15 cm (L) were prepared for the treatment with a termiticide (silafluofen). A treatment cycle was performed by loading two specimens of each wood species, applying the temperature of 15⁰C and pressure of 60 kg/cm2, gradually increasing the temperature and pressure, respectively, to 35⁰C and 80 kg/cm2, and releasing the pressure to atmosphere. The treatment was conducted with five replicates. Untreated and treated specimens were then evaluated their physical, mechanical, and biological properties. Results show that the MPCO2treatment significantly enhanced the termite resistance of treated wood without any adverse effects on their physical and mechanical properties.A new approach in wood preservative treatment using carbon dioxide (CO2) as a carrier solvent has been developed and evaluated its effect on the physical, mechanical, and biological properties of treated tropical wood. It employs CO2 at various combinations of temperatures and pressures in a treatment vessel at once and is called Multi-Phase Carbon Dioxide (MPCO2) treatment. Three commercial tropical wood species (Agathis sp., Palaquium sp., and Heritiera sp.) measuring 1.5 cm (T) x 1.5 cm (R) x 15 cm (L) were prepared for the treatment with a termiticide (silafluofen). A treatment cycle was performed by loading two specimens of each wood species, applying the temperature of 15⁰C and pressure of 60 kg/cm2, gradually increasing the temperature and pressure, respectively, to 35⁰C and 80 kg/cm2, and releasing the pressure to atmosphere. The treatment was conducted with five replicates. Untreated and treated specimens were then evaluated their physical, mechanical, and biological properties. Results show that the MPCO2 treatment significantly enhanced the termite resistance of treated wood without any adverse effects on their physical and mechanical properties
Keterawetan Kayu Tropis dengan Proses Pengawetan Menggunakan Karbon Dioksida sebagai Pelarut Pembawa Treatability of Tropical Wood Species with Preservative Treatment Using Carbon Dioxide as a Carrier Solvent
No full textThe feasibility of a preservative treatment using carbon dioxide (CO2) as a carrier solvent under various conditions was determined based on the treatability of three different commercial tropical wood species (Agathis sp., Palaquium sp., and Heritiera sp.). Treatment was conducted at six combinations of temperature and pressure (15ºC and 40 kgf/cm2, 15ºC and 60 kgf/cm2, 15ºC and 80 kgf/cm2, 25ºC and 60 kgf/cm2, 25ºC and 80 kgf/cm2, dan 35ºC and 80 kgf/cm2) with five replicates using two specimens of each wood species for each treatment. Results showed that most of these treatment conditions, except treatment at 15ºC and 40 kgf/cm2, resulted in retention levels above the Silafluofen toxic thereshold value (< 0.25 kg/m3) without any physical damages to all treated materials. The treatability of wood with CO2 impregnation was affected by the wood properties and treatment condition
ANTITERMITIC ACTIVITIES OF BITTI WOOD EXTRACTIVES (Vitex cofassus Reinw.)
Get PDFWoods with low natural durability are vurnerable to the attack of organisms. Preservation\ud
processes increasing wood service life would encounter this problem. However,\ud
preservatives that are usually non-biodegradable will lead to some environmental\ud
problems. The development of biodegradable and renewable natural preservatives that\ud
are environmental friendly is then necessary. This research was aimed at determining\ud
bioactivity of bitti wood (Vitex cofassus Reinw.) extractives to subterranean termite,\ud
Coptotermes curvignathus Holmgren. Extraction and successive fractionation of the wood\ud
extractive resulted in 2.49% of acetone extract consisting of 1.470%, 0.053%, 0.027%, and\ud
0.940% of n-hexane, ethyl ether, ethyl acetate and residue fractions, respectively. The\ud
termite test indicated that ethyl ether fraction was the highest antitermitic activity
FEEDING PREFERENCE OF COPTOTERMES (ISOPTERA: RHINOTERMITIDAE) IN SOUTH SULAWESI, INDONESIA
Get PDFGenus Coptotermes play a critical role in the ecosystem, but is also the most important pest with species that cause the most damage to the wooden constructions and commercial crops in the world, including in Indonesia. This study aimed to observe and analyze the feeding preference of Coptotermes in South Sulawesi. Termites survey covered on South Sulawesi area with the elevation sites below 500 m; specimens collected used the insidential method of sampling; and host or plant attacked by Coptotermes used descriptive analysis . The results showed that there are twelve plants species attacked by Coptotermes, and the jawa wood (Lannea grandis L.) was dominantly preferred to feed by termites (56,7%) based on live plants
SIFAT FISIK IJUK DAN POTENSINYA SEBAGAI PERINTANG FISIK SERANGAN RAYAP TANAH
Get PDFThe fiber of sugar-palm tree Arenga pinnata Merr., locally known as ijuk, is traditionally used as covering to protect ground-contact wood construction materials although effectiveness of the material in protecting wood construction from biodeterioration has not been determined. In the current study, potential of the sugar-palm tree fiber as a physical barrier against termite attacks was analyzed in terms of their structure and physical characteristics. Samples of sugar-palm tree fibers from natural and marketed formations were prepared and determined for their fiber distribution, shapes, sizes, moisture content, density, and sheet grammage since these aspects were considered to be important factors influencing the penetration ability of termites. Results showed that each of the sugar-palm tree fibers has different shapes (half-round, round, rectangle) and different sizes (ranging from 0.05 to 1.00 mm in thickness). It was also found to have 3-5 ramifications with the angle of 10o – 30o. The process of branching out was supposed to initiate a natural insertion of each formed fiber to others. It is believed that fibers with particular arrangements are able to prevent the penetration or tunneling of termites.
Keywords: Sugar- palm tree fiber, physical barrier, subterranean termite
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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