The Experts below are selected from a list of 24222 Experts worldwide ranked by ideXlab platform
Tom Baer - One of the best experts on this subject based on the ideXlab platform.
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solid freeform fabrication of aqueous alumina poly vinyl alcohol gelcasting suspensions
Journal of the American Ceramic Society, 2004Co-Authors: Sherry L Morissette, Jennifer A Lewis, Joseph Cesarano, D Dimos, Tom BaerAbstract:Solid freeform fabrication of aqueous alumina–poly(vinyl alcohol) (Al2O3–PVA) gel-casting suspensions was conducted using a computer-controlled extrusion apparatus fitted with a two-nozzle delivery system. The impact of casting parameters on the shear rate profiles experienced during deposition was evaluated via conventional flow analysis and computer simulations. In addition, the influence of these parameters on line resolution/uniformity, printability, and as-cast component properties was studied using laser profilometry, optical microscopy, and scanning electron microscopy. Continuous printablity was achieved for Tip Diameters ranging from 0.254 to 1.370 mm for all mixing rates and suspension compositions studied. Printed lines were uniform with good edge definition, and line dimensions were independent of mixing rate for these process conditions. The Al2O3 volume fraction (φAl2O3) in the as-deposited layers depended on casting conditions and cross-linking agent concentration, where (φAl2O3 increased with decreased Tip Diameter and increased cross-linking agent concentration. The free-formed Al2O3 components exhibited uniform particle packing, with minimal macrodefects (e.g., slumping or staircasing) and no discernable microdefects (e.g., bubbles or cracking).
Sherry L Morissette - One of the best experts on this subject based on the ideXlab platform.
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solid freeform fabrication of aqueous alumina poly vinyl alcohol gelcasting suspensions
Journal of the American Ceramic Society, 2004Co-Authors: Sherry L Morissette, Jennifer A Lewis, Joseph Cesarano, D Dimos, Tom BaerAbstract:Solid freeform fabrication of aqueous alumina–poly(vinyl alcohol) (Al2O3–PVA) gel-casting suspensions was conducted using a computer-controlled extrusion apparatus fitted with a two-nozzle delivery system. The impact of casting parameters on the shear rate profiles experienced during deposition was evaluated via conventional flow analysis and computer simulations. In addition, the influence of these parameters on line resolution/uniformity, printability, and as-cast component properties was studied using laser profilometry, optical microscopy, and scanning electron microscopy. Continuous printablity was achieved for Tip Diameters ranging from 0.254 to 1.370 mm for all mixing rates and suspension compositions studied. Printed lines were uniform with good edge definition, and line dimensions were independent of mixing rate for these process conditions. The Al2O3 volume fraction (φAl2O3) in the as-deposited layers depended on casting conditions and cross-linking agent concentration, where (φAl2O3 increased with decreased Tip Diameter and increased cross-linking agent concentration. The free-formed Al2O3 components exhibited uniform particle packing, with minimal macrodefects (e.g., slumping or staircasing) and no discernable microdefects (e.g., bubbles or cracking).
Lee H Silverstein - One of the best experts on this subject based on the ideXlab platform.
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periodontal probing probe Tip Diameter
Journal of Periodontology, 2000Co-Authors: Jerry J Garnick, Lee H SilversteinAbstract:Background: Periodontal probing is one of the most common methods used in diagnosing periodontal disease. The purpose of this study was to determine the importance of the Diameter of periodontal probing Tips in diagnosing and evaluating periodontal disease. Methods: The literature discussing periodontal probe Diameters in human, dog, and monkey studies was reviewed and compared. Tip Diameters varied from 0.4 to over 1.0 mm in these studies. Probe advancement between the gingiva and the tooth is determined by the pressure exerted on the gingival tissues and resistance from the healthy or inflamed tissue. The pressure is directly proportionate to the force on the probe and inversely proportionate to the probe Tip Diameter. The larger probing Diameters reduced probe advancement into inflamed connective tissue. This effect of change in probe Diameter reduced the pressure in a greater manner than an increase of similar change in probe force. Results: In the studies reviewed, the pressure used to place the prob...
Joseph Cesarano - One of the best experts on this subject based on the ideXlab platform.
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solid freeform fabrication of aqueous alumina poly vinyl alcohol gelcasting suspensions
Journal of the American Ceramic Society, 2004Co-Authors: Sherry L Morissette, Jennifer A Lewis, Joseph Cesarano, D Dimos, Tom BaerAbstract:Solid freeform fabrication of aqueous alumina–poly(vinyl alcohol) (Al2O3–PVA) gel-casting suspensions was conducted using a computer-controlled extrusion apparatus fitted with a two-nozzle delivery system. The impact of casting parameters on the shear rate profiles experienced during deposition was evaluated via conventional flow analysis and computer simulations. In addition, the influence of these parameters on line resolution/uniformity, printability, and as-cast component properties was studied using laser profilometry, optical microscopy, and scanning electron microscopy. Continuous printablity was achieved for Tip Diameters ranging from 0.254 to 1.370 mm for all mixing rates and suspension compositions studied. Printed lines were uniform with good edge definition, and line dimensions were independent of mixing rate for these process conditions. The Al2O3 volume fraction (φAl2O3) in the as-deposited layers depended on casting conditions and cross-linking agent concentration, where (φAl2O3 increased with decreased Tip Diameter and increased cross-linking agent concentration. The free-formed Al2O3 components exhibited uniform particle packing, with minimal macrodefects (e.g., slumping or staircasing) and no discernable microdefects (e.g., bubbles or cracking).
Jennifer A Lewis - One of the best experts on this subject based on the ideXlab platform.
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solid freeform fabrication of aqueous alumina poly vinyl alcohol gelcasting suspensions
Journal of the American Ceramic Society, 2004Co-Authors: Sherry L Morissette, Jennifer A Lewis, Joseph Cesarano, D Dimos, Tom BaerAbstract:Solid freeform fabrication of aqueous alumina–poly(vinyl alcohol) (Al2O3–PVA) gel-casting suspensions was conducted using a computer-controlled extrusion apparatus fitted with a two-nozzle delivery system. The impact of casting parameters on the shear rate profiles experienced during deposition was evaluated via conventional flow analysis and computer simulations. In addition, the influence of these parameters on line resolution/uniformity, printability, and as-cast component properties was studied using laser profilometry, optical microscopy, and scanning electron microscopy. Continuous printablity was achieved for Tip Diameters ranging from 0.254 to 1.370 mm for all mixing rates and suspension compositions studied. Printed lines were uniform with good edge definition, and line dimensions were independent of mixing rate for these process conditions. The Al2O3 volume fraction (φAl2O3) in the as-deposited layers depended on casting conditions and cross-linking agent concentration, where (φAl2O3 increased with decreased Tip Diameter and increased cross-linking agent concentration. The free-formed Al2O3 components exhibited uniform particle packing, with minimal macrodefects (e.g., slumping or staircasing) and no discernable microdefects (e.g., bubbles or cracking).
