Browsing by Subject "statistical analysis"
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Item Effect of Printing Parameters on the Internal Geometry of Products Manufactured by Fused Filament Fabrication (FFF)(University of Texas at Austin, 2023) Moreno-Núñez, Benjamin A.; Trevino-Quintanilla, Cecilia D.; Esponiza-Garcia, Juan Carlos; Uribe-Lam, Esmeralda; Cuan-Urquizo, EnriqueThe internal geometry of a 3D-printed product determines its mechanical properties. In Fused Filament Fabrication (FFF) the filaments that build up the internal geometry suffer from variations that have not been sufficiently studied. This research focused on identifying the parameters that most affect the filaments and finding the optimum values to reduce their variations. A fractional factorial design of experiments was used to detect the printing parameters of FFF that most affect the width of extruded filaments, these results were also statistically analyzed. A response optimization was done to obtain the values of the printing parameters that will give the closest width of extruded filaments to the nozzle of the 3D printer used. Results showed layer height has the largest impact on filament width variation.Item Letter to H.B. Stenzel from Ernst Mayr on 1948-10-15(1948-10-15) Mayr, ErnstItem Letter to H.B. Stenzel from P.J.Alwin Zeller on 1932-03-08(1932-03-08) Zeller, P.J.AlwinItem Letter to H.B. Stenzel from W.H. Matthews on 1948-10-27(1948-10-27) Matthews, W.H.Item Toward a Statistical Overview of the Archaic Cultures of Central and Southwwestern Texas(Texas Memorial Museum, The University of Texas at Austin, 1967-04) Johnson Jr., LeroyTotal lithic artifact collections from nine Texas sites are compared here by a simple form of cluster analysis with ordered matrix. Roark Cave, Coontail Spin Rockshelter, Centipede Cave, and the Devil's Mouth Site occur in the desertland of southwestern Texas, while the Wunderlich Site and the Levi, Oblate, Smith, and Kyle rockshelters are located in the semi-wooded hills of central Texas. All are simple middens without discrete occupational components. Since component recognition is necessary for archeological unit definition, a culture-historical integration of the archeological data from these sites must be achieved by some other means. This paper develops a comparative method suitable for this task. Lithic artifacts from site columns are isolated into collections representing given intervals of time, described typologically, and compared quantitatively to produce Robinson (1951) indexes of agreement. These indexes are grouped into clusters by matrix analysis, to reveal spatial-temporal patterns of uniformity amenable to cultural and ecological interpretations. Index clusters are plotted in time and space. This plotting shows (1) that the desert area of southwestern Texas is more stable, archeologically, from one period to another than the semi-wooded area of central Texas, and (2) that the two areas stand apart as separate archeological provinces throughout much of their histories.