On a mis au point deux techniques de preparation d'echantillons servant a l'observation a... more On a mis au point deux techniques de preparation d'echantillons servant a l'observation au microscope electronique des fibres de la pâte a l'etat libre ou dans la feuille de papier. La premiere technique fait appel a la coloration des fibrilles exterieures, la deuxieme favorise la conservation de la structure de la feuille a l'aide de la reticulation formaldehyde. Ces methodes servent a l'observation des liaisons interfibre dans le papier
... Sinc~ the structure of bamboo fibers varies among certain species (Parames-waran, Liese 1976)... more ... Sinc~ the structure of bamboo fibers varies among certain species (Parames-waran, Liese 1976), we chose only one major species of bamboo, namely ... microscopic observation of the distribution of fiber bundles across the culm wall, blocks, 7 mm x 10 mm x 12 ram, which had ...
Vessel picking troubles of printing papers made from tropical hardwood pulps can be easily preven... more Vessel picking troubles of printing papers made from tropical hardwood pulps can be easily prevented by covering vessel elements with several fibers. This paper deals with the effect of covering layer on vessel picking. Using multi-layered handsheet forming device (JPRI Multi-head) two-layered sheets consisted
... to-cement ratio of 1.0 using commercially available ASTM Type I portland cement, deionized wa... more ... to-cement ratio of 1.0 using commercially available ASTM Type I portland cement, deionized water (resistivity = 18.2 MΩ m), and natural siliceous sand (fineness modulus = 1.80), obtained from Brown Brothers Quarry in Junction City, Georgia. ... [7] and Xu and Hannant [8] and [9 ...
Previous research efforts on pulp fiber-cement composites have largely concentrated on kraft pulp... more Previous research efforts on pulp fiber-cement composites have largely concentrated on kraft pulp fiber composites. In this research program, thermomechanical pulp (TMP) fibers were investigated as an economical alternative to kraft pulp fibers as reinforcement in fibercement composites. Prior to wet/dry cycling, TMP composites exhibited increased first crack strength, but lower peak strength and lower post-cracking toughness, as compared to unbleached and bleached kraft pulp composites at equivalent fiber volume fractions. It is believed that this behavior can be attributed to the lower tensile strength and shorter fiber length of TMP fibers as compared to kraft fibers. After 25 wet/dry cycles, TMP composites showed losses in first crack (peak) strength and post-cracking toughness. However, TMP composites exhibited a slower progression of degradation during wet/dry cycling than composites containing bleached or unbleached kraft fibers.
"March 23, 1999."v. 1. On-line measurement of paper properties: status report for proje... more "March 23, 1999."v. 1. On-line measurement of paper properties: status report for project F007 / Mac Hall , Ted Jackson , Andy Brown ; Fundamentals of acoustic radiation pressure: status report for project F008 / Pierre Brodeur ... [et al.] ;Fundamentals of dimensional stability: status report for project F020 / Douglas Coffin , Barry Hojjatie , Kennisha Collins ; Micromechanics of fiber networks: status report for project F023 / Martin Ostoja-Starzewski ... [et al.] ; Improving the refining of chemical pulps: status report for project F024 / John Waterhouse , Hiroki Nanko , Miranda Bliss ; Fundamentals of interfiber bonding: status report for project F025 / Hiroki Nanko , Shaobo Pan -- v. 2.Fundamentals of accelerated creep: status report for project F026 / Charles Habeger , Douglas Coffin , Barry Hojjatie ; Paper stiffness vs papermaking variable: status report for project F031 / Pierre Brodeur ... [et al.] -- Slide materials
Water/water mixing experiments have been completed in a concentric mixer for velocity ratios betw... more Water/water mixing experiments have been completed in a concentric mixer for velocity ratios between 1 and 6. l Turbulence model closure constants affect the predicted mixing results using the experimental results, the closure constants were determined. l Reasonable qualitative agreement between experiments and numerical predictions have been obtained with water/water concentric mixing. l A new method to model water/fiber mixing has been proposed.
Kyoto University (京都大学)0048新制・課程博士農学博士甲第2263号農博第302号新制||農||280(附属図書館)学位論文||S54||N1090(農学部図書室)6321... more Kyoto University (京都大学)0048新制・課程博士農学博士甲第2263号農博第302号新制||農||280(附属図書館)学位論文||S54||N1090(農学部図書室)6321UT51-54-P322京都大学大学院農学研究科林産工学専攻(主査)教授 原田 浩, 教授 島地 謙, 教授 中戸 莞二学位規則第5条第1項該
Demonstration and economic feasibility study of ultrasonic whitewater clarification in a mill env... more Demonstration and economic feasibility study of ultrasonic whitewater clarification in a mill environment.
visualization studies of lignocellulosic oxidation chemistry by application of C-near edge X-ray ... more visualization studies of lignocellulosic oxidation chemistry by application of C-near edge X-ray absorption fine structure spectroscopy
A novel transmission electron microscopy technique for the visualization of polymers adsorbed on ... more A novel transmission electron microscopy technique for the visualization of polymers adsorbed on secondary fines has been developed. This technique has been utilized in observing the adsorption behavior of various wet-end additives. The technique is sensitive enough not only to allow differentiation between linear and branched polymers, but also to observe differences in the adsorption behavior and conformational characteristics of particular polymeric derivatives. Conformational changes of a cationic polyacrylamide (CPAM) were examined in response to variations in wet-end conditions, such as mixing time and system conductivity. The molecular conformations of cationic starch and cationic guar gum were also examined by this technique. The technique has been employed to observe the effects of silica microparticles on the conformational characteristics of CPAM (drainage/retention aid) pre-adsorbed on secondary fines. The transmission electron microscopy method is a viable tool for inve...
On a mis au point deux techniques de preparation d'echantillons servant a l'observation a... more On a mis au point deux techniques de preparation d'echantillons servant a l'observation au microscope electronique des fibres de la pâte a l'etat libre ou dans la feuille de papier. La premiere technique fait appel a la coloration des fibrilles exterieures, la deuxieme favorise la conservation de la structure de la feuille a l'aide de la reticulation formaldehyde. Ces methodes servent a l'observation des liaisons interfibre dans le papier
... Sinc~ the structure of bamboo fibers varies among certain species (Parames-waran, Liese 1976)... more ... Sinc~ the structure of bamboo fibers varies among certain species (Parames-waran, Liese 1976), we chose only one major species of bamboo, namely ... microscopic observation of the distribution of fiber bundles across the culm wall, blocks, 7 mm x 10 mm x 12 ram, which had ...
Vessel picking troubles of printing papers made from tropical hardwood pulps can be easily preven... more Vessel picking troubles of printing papers made from tropical hardwood pulps can be easily prevented by covering vessel elements with several fibers. This paper deals with the effect of covering layer on vessel picking. Using multi-layered handsheet forming device (JPRI Multi-head) two-layered sheets consisted
... to-cement ratio of 1.0 using commercially available ASTM Type I portland cement, deionized wa... more ... to-cement ratio of 1.0 using commercially available ASTM Type I portland cement, deionized water (resistivity = 18.2 MΩ m), and natural siliceous sand (fineness modulus = 1.80), obtained from Brown Brothers Quarry in Junction City, Georgia. ... [7] and Xu and Hannant [8] and [9 ...
Previous research efforts on pulp fiber-cement composites have largely concentrated on kraft pulp... more Previous research efforts on pulp fiber-cement composites have largely concentrated on kraft pulp fiber composites. In this research program, thermomechanical pulp (TMP) fibers were investigated as an economical alternative to kraft pulp fibers as reinforcement in fibercement composites. Prior to wet/dry cycling, TMP composites exhibited increased first crack strength, but lower peak strength and lower post-cracking toughness, as compared to unbleached and bleached kraft pulp composites at equivalent fiber volume fractions. It is believed that this behavior can be attributed to the lower tensile strength and shorter fiber length of TMP fibers as compared to kraft fibers. After 25 wet/dry cycles, TMP composites showed losses in first crack (peak) strength and post-cracking toughness. However, TMP composites exhibited a slower progression of degradation during wet/dry cycling than composites containing bleached or unbleached kraft fibers.
"March 23, 1999."v. 1. On-line measurement of paper properties: status report for proje... more "March 23, 1999."v. 1. On-line measurement of paper properties: status report for project F007 / Mac Hall , Ted Jackson , Andy Brown ; Fundamentals of acoustic radiation pressure: status report for project F008 / Pierre Brodeur ... [et al.] ;Fundamentals of dimensional stability: status report for project F020 / Douglas Coffin , Barry Hojjatie , Kennisha Collins ; Micromechanics of fiber networks: status report for project F023 / Martin Ostoja-Starzewski ... [et al.] ; Improving the refining of chemical pulps: status report for project F024 / John Waterhouse , Hiroki Nanko , Miranda Bliss ; Fundamentals of interfiber bonding: status report for project F025 / Hiroki Nanko , Shaobo Pan -- v. 2.Fundamentals of accelerated creep: status report for project F026 / Charles Habeger , Douglas Coffin , Barry Hojjatie ; Paper stiffness vs papermaking variable: status report for project F031 / Pierre Brodeur ... [et al.] -- Slide materials
Water/water mixing experiments have been completed in a concentric mixer for velocity ratios betw... more Water/water mixing experiments have been completed in a concentric mixer for velocity ratios between 1 and 6. l Turbulence model closure constants affect the predicted mixing results using the experimental results, the closure constants were determined. l Reasonable qualitative agreement between experiments and numerical predictions have been obtained with water/water concentric mixing. l A new method to model water/fiber mixing has been proposed.
Kyoto University (京都大学)0048新制・課程博士農学博士甲第2263号農博第302号新制||農||280(附属図書館)学位論文||S54||N1090(農学部図書室)6321... more Kyoto University (京都大学)0048新制・課程博士農学博士甲第2263号農博第302号新制||農||280(附属図書館)学位論文||S54||N1090(農学部図書室)6321UT51-54-P322京都大学大学院農学研究科林産工学専攻(主査)教授 原田 浩, 教授 島地 謙, 教授 中戸 莞二学位規則第5条第1項該
Demonstration and economic feasibility study of ultrasonic whitewater clarification in a mill env... more Demonstration and economic feasibility study of ultrasonic whitewater clarification in a mill environment.
visualization studies of lignocellulosic oxidation chemistry by application of C-near edge X-ray ... more visualization studies of lignocellulosic oxidation chemistry by application of C-near edge X-ray absorption fine structure spectroscopy
A novel transmission electron microscopy technique for the visualization of polymers adsorbed on ... more A novel transmission electron microscopy technique for the visualization of polymers adsorbed on secondary fines has been developed. This technique has been utilized in observing the adsorption behavior of various wet-end additives. The technique is sensitive enough not only to allow differentiation between linear and branched polymers, but also to observe differences in the adsorption behavior and conformational characteristics of particular polymeric derivatives. Conformational changes of a cationic polyacrylamide (CPAM) were examined in response to variations in wet-end conditions, such as mixing time and system conductivity. The molecular conformations of cationic starch and cationic guar gum were also examined by this technique. The technique has been employed to observe the effects of silica microparticles on the conformational characteristics of CPAM (drainage/retention aid) pre-adsorbed on secondary fines. The transmission electron microscopy method is a viable tool for inve...
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