An Investigation into the Parameters Affecting Vehicle Migration During the Redistribution of Aqueous Coatings

The purpose of this study was to determine what effect shear has upon the vehicle migration in aqueous coatings. The roll inclined-plane apparatus was utilized to generate various ranges of shear rate. An immobilization factor was then calculated for these different rates of shear indicating the degree of vehicle penetration. The particle size of the binder and the particle size of the pigment were varied to determine their effect on the penetration into the base substrate. It was concluded that high shear rates pack the particles, either binder or pigment, into the pores of the base substrate. This phenomenon prevents the migration of the liquid phase

Investigating scientific literacy: Scientist’s habits of mind as evidenced by their rationale of science and religious beliefs

Science and technology have been incredibly success¬ful in purely technical terms. For instance, international air travel, space flight, and curing of hitherto untreatable medical illnesses all are now routine events. One feature of the incredible (and seemingly ever increasing) advance of science and technology is a sense of unease amongst the general population of science’s potential to change our lives, in sometimes unpredictable and alarming ways. Public understanding of science, or scientific literacy, is of increasing concern worldwide according to much recent literature

Ceramic Vessels from Caddo Sites in Wood County, Texas

This article concerns the documentation of 54 ceramic vessels in the collections of the Texas Archeological Research Laboratory at The University of Texas at Austin (TARL) from seven ancestral Caddo sites in Wood County in East Texas (Figure 1). This includes vessels from A. C. Gibson (41WD1, n=2 vessels), J. H. Reese (41WD2, n=26), H. D. Spigner (41WD4, n=17), Mattie Dial (41WD5, n=2), B. F. Cathey (41WD14, n=2), J. H. Baker (41WD33, n=4), and 41WD117 (n=1 vessel). The A. C. Gibson site is situated in the floodplain of the Sabine River near the confluence with Cottonwood Creek. In 1932, looters had dig in a midden deposit (with many mussel shells) and exposed one ancestral Caddo burial with two vessels. In 1934, University of Texas archaeologists excavated two more burials (S-1 and S-2) in the midden. Burial S-1 was that of a child, in a flexed position; this burial had no associated funerary offerings. Burial S-2 held two individuals in an extended supine position in an east-west oriented grave. This burial had two ceramic vessels and a rounded elbow pipe as funerary offerings. The TARL files also indicate that at least three ancestral Caddo burials were excavated by amateur archaeologists prior to the 1970s, and at least one burial had associated ceramic vessels. The nearby Son Gibson Farm site (41WD518) is reported to have had sherds from Sanders Slipped, Sanders Engraved, Canton Incised, and Maxey Noded Redware vessels, and it may be contemporaneous with the burials at the A. C. Gibson site

Relocation Is Not Enough: Employment Barriers Among HOPE VI Families

Examines whether the federal HOPE VI housing program has affected employment rates among residents, and identifies barriers to workforce participation. Based on surveys of residents at five Hope VI public housing sites

Caddo Ceramic Vessel Sherds in a 2004 Surface Collection from the Sanders Site (41LR2), Lamar County, Texas

The T. M. Sanders site (41LR2) is one of the more important ancestral Caddo sites known in East Texas, primarily because of its two earthen mounds and the well-preserved mortuary features of Caddo elite persons buried in Mound No. 1 (the East Mound), as well as its extensive (200+ acres) habitation deposits and material culture remains of the Middle Caddo and Historic Caddo period components. The T. M. Sanders site is located on a broad alluvial terrace just south of the confluence of Bois d’Arc Creek and the Red River

Bridging Mechanistic and Phenomenological Models of Complex Biological Systems

The inherent complexity of biological systems gives rise to complicated mechanistic models with a large number of parameters. On the other hand, the collective behavior of these systems can often be characterized by a relatively small number of phenomenological parameters. We use the Manifold Boundary Approximation Method (MBAM) as a tool for deriving simple phenomenological models from complicated mechanistic models. The resulting models are not black boxes, but remain expressed in terms of the microscopic parameters. In this way, we explicitly connect the macroscopic and microscopic descriptions, characterize the equivalence class of distinct systems exhibiting the same range of collective behavior, and identify the combinations of components that function as tunable control knobs for the behavior. We demonstrate the procedure for adaptation behavior exhibited by the EGFR pathway. From a 48 parameter mechanistic model, the system can be effectively described by a single adaptation parameter $\tau$ characterizing the ratio of time scales for the initial response and recovery time of the system which can in turn be expressed as a combination of microscopic reaction rates, Michaelis-Menten constants, and biochemical concentrations. The situation is not unlike modeling in physics in which microscopically complex processes can often be renormalized into simple phenomenological models with only a few effective parameters. The proposed method additionally provides a mechanistic explanation for non-universal features of the behavior

Model Reduction on the Wnt Pathway Leads to Biological Adaptation

Complex systems are an unavoidable problem in the field of biology. One of the ways that scientists have tried to overcome this problem is by building mathematical models—manageable representations designed to look at specific physical phenomena. The Wnt Signaling Pathway is a complex system known to regulate cell-to-cell interactions, play a crucial role in Embryonic Development, and has been implicated in the study of cancer. Typically, the Wnt signal is observed through the behavior of a protein called beta-Catenin (β-Catenin). In 2003, Lee et al. built a model of the Wnt pathway which caused β-Catenin to increase over time. However, in 2010, Jensen et al. built a different model of the Wnt pathway which caused β-Catenin to oscillate over time. This project called for model reduction on the Jensen et al. model to identify the phenomenological parameter combinations that determined features of the Wnt oscillations. The method used to reduce the model is called the Manifold Boundary Approximation Method, which is a geometric, parameter-independent method of reducing the model one parameter at a time. Reduction of the model showed that there were 5 variables and 8 parameters which drove the oscillating behavior of the system. After comparing our results to the Lee et al. reduced model of the Wnt pathway done by student Dane Bjork, a minimal model was constructed which predicted a novel class behavior of the Wnt system: biological adaptation

Ceramic Beads from the Cloud Hammond Site (41SM244), Smith County, Texas

During investigations at the Cloud Hammond site (41SM244) during the 1960s, J. A. Walters recovered Caddo ceramics, two clay beads, Perdiz arrow points, and two Gary dart points. The site is located in northern Smith County, Texas, about 400 m east of the Middle Caddo period Jamestown Mound site (41SM54). Of the artifacts reported to have been recovered from the site, only one clay bead was available for study. No record survives of the extent of investigations at the Cloud Hammond site or if any cultural features such as burials were found during the 1960s work