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 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : The Physical Properties, Fiber Morphology and Chemical Compositions of Sweet Bamboo (Dendrocalamus asper Backer)) ผู้เขียน: สุพัฒน์ คำไทย,  ดร.ประเทือง พุฒซ้อน, ผู้ช่วยศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractThe physical properties, fiber morphology and chemical compositions of sweet bamboo (Dendrocalamus asper Backer) were investigated for utilization in pulp and papermaking. The results indicated that the variation of sweet bamboo properties along the culm depended on position (base, middle and top) and part (node and internode). The basic density and moisture content of sweet bamboo were 725 kg/m3 and 60.24%, respectively. Data collected from sweet bamboo fiber morphology illustrated its fiber dimensions as follows: fiber length 3.11 mm, fiber width 18.03 ?m, cell wall thickness 6.98 ?m and cell lumen 4.35 ?m. The chemical compositions were holocellulose 76.33%, alpha-cellulose 68.11%, lignin 28.70% and ash 1.46%. The solubility in different solvents were alcohol-benzene 5.91%, hot water 8.04%, cold water 7.03% and 1% NaOH 24.91%. According to the results, sweet bamboo has potential as a raw material for long fiber production in Thailand. |
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ที่มา:การประชุมวิชาการวิศวกรรมโยธาแห่งชาติ ครั้งที่15หัวเรื่อง:พฤติกรรมการรับแรงดัดของลำไม้ไผ่ตง |
ที่มา:32nd Congress on Science and Technology of Thailandหัวเรื่อง:Preparation and Characterization of Activated Carbon from Dendrocalamus Asper Backer and Dendrocalamus Latiflorus |
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หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Physicochemical Characteristics of Wood Vinegars from Carbonization of Leucaena leucocephala, Azadirachta indica, Eucalyptus camaldulensis, Hevea brasiliensis and Dendrocala ผู้เขียน:Yongyuth Theapparat, Ausa Chandumpai, Wichitra Leelasuphakul, นิคม แหลมสัก, Chanita Ponglimanont สื่อสิ่งพิมพ์:pdf AbstractThe physicochemical characteristics were evaluated of eight wood vinegars from the carbonization of five wood species—Leucaena leucocephala (Katin), Azadirachta indica (Sadao), Eucalyptus camaldulensis, Hevea brasiliensis (rubber wood) and Dendrocalamus asper (bamboo). The vinegars were produced by heating wood samples up to 400 ?C in a Thai-Iwate kiln and were compared with two commercial products. The quality assessments of all wood vinegars were determined according to criteria from the Charcoal Handbook. The results showed that all wood vinegar samples appeared to be good quality in terms of odor, color and transparency. The pH (2.9–3.5) and total soluble tar (0.325–0.963 % by weight) also met the standard criteria for the pH (around 3) and total soluble tar (not more than 3%). The values of the specific gravity of only two products, from rubber wood (1.012 g.mL-1) and bamboo (1.010 g.mL-1) were within the acceptance criteria of 1.010–1.050 g.mL-1. Chemical compositions of wood vinegars as determined qualitatively by gas chromatography/mass spectrometry and quantitatively by gas chromatography/flame ionized detector consisted of acetic acid as the largest component (30.45–70.60 mg.mL-1). A high number of phenol derivatives (16 compounds) were found and those in higher concentrations were 4-propyl-2-methoxyphenol (5–11 mg.mL-1) followed by 2-methylphenol (2–4 mg.mL-1). An acetic acid concentration from the eight samples whose presence was indicated by pKa at 4.7 was mainly responsible for the pH values as shown in the good correlations of plots between pH and acetic acid concentrations (Correlation coefficient, R = 0.92). The total acid contents of the ten wood vinegars as determined by titration with 0.1 N sodium hydroxide showed poor correlations with pH (R = 0.65) due to the presence of a variety of organic acids and phenolic compounds which may have affected proton transition. The specific gravity showed good correlations with total soluble tar and degree Brix (R = 0.87 for both); in turn the degree Brix showed good correlation with the total soluble tar (R = 0.87). Thus, the degree Brix which was easy to determine could be used as a general indicator of total soluble tar. The amount of total soluble tar signified the presence of phenolic compounds, of which previous studies suggested antifungal activity and usefulness as wood preservatives. Phenolic compounds were also confirmed by the ultraviolet absorption maximum (?max) at 268–274 nm. |
 Researcherดร. จงรัก วัชรินทร์รัตน์, อาจารย์ที่ทำงาน:ภาควิชาวนวัฒนวิทยา คณะวนศาสตร์ สาขาที่สนใจ: การปลูกสร้างสวนป่า , การปลูกสร้างสวนป่ายูคาลิปตัส สัก , วนวัฒนสถิติ , ปฐพีวิทยาป่าไม้ , การจัดการดินป่าไม้ Resume |
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ที่มา:การประชุมวิชาการ ครั้งที่ 47 มหาวิทยาลัยเกษตรศาสตร์หัวเรื่อง:การสร้างแผนที่พันธุกรรมมันสำปะหลังโดยใช้เครื่องหมายดีเอ็นเอชนิด SSR |