Entity

Time filter

Source Type

East Saint Louis, OK, United States

East Central University is a four-year public university in Ada, Oklahoma, located in the south central region of the state. The university also has courses available in McAlester, Shawnee, Ardmore, and Durant.The university began in 1909 as a normal school that taught high school and college classes. Some of its more famous alumni include former NFL player Mark Gastineau, past governors Robert S. Kerr and George Nigh, former U.S. Representative Lyle Boren, Oklahoma Supreme Court Justice Tom Colbert, and U.S. Army General James D. Thurman. Wikipedia.


Jacobson N.S.,NASA | Myers D.L.,East Central University
Journal of Physical Chemistry B | Year: 2011

The vaporization of B2O3 in a reducing environment leads to the formation of both B2O3(g) and B 2O2(g). Whereas the formation of B2O 3(g) is well understood, many questions about the formation of B 2O2(g) remain. Previous studies using B(s) + B 2O3(l) have led to inconsistent thermodynamic data. In this study, it was found that, after heating, B(s) and B2O 3(l) appeared to separate and variations in contact area likely led to the inconsistent vapor pressures of B2O2(g). To circumvent this problem, the activity of boron was fixed with a two-phase mixture of FeB and Fe2B. Both second-and third-law enthalpies of formation were measured for B2O2(g) and B 2O3(g). From these values, the enthalpies of formation at 298.15 K were calculated to be -479.9 ± 25.7 kJ/mol for B 2O2(g) and -833.4 ± 13.1 kJ/mol for B 2O3(g). Ab initio calculations to determine the enthalpies of formation of B2O2(g) and B2O3(g) were conducted using the W1BD composite method and showed good agreement with the experimental values. © 2011 American Chemical Society. Source


Jacobson N.S.,NASA | Myers D.L.,East Central University
Oxidation of Metals | Year: 2011

Silicon carbide (SiC) forms a protective condensed-phase oxide (SiO 2) in passive oxidation and a volatile sub-oxide (SiO(g)) in active oxidation. The transition between these two modes of oxidation and the rates of active oxidation are critical issues. A literature review indicates that impurity effects, the difference between active-to-passive and passive-to-active transitions, and the effect of total pressure on these transitions remain unexplored for SiC. Measurements were made in a thermogravimetric apparatus (TGA) by changing oxygen potentials either by blending O 2/Ar mixtures or changing total pressures in a pure oxygen gas stream to the point where a transition occurs. Specimens were examined with standard optical and electron-optical techniques. Active-to-passive and passive-to-active transitions were measured and found to be similar for SiC, which is in contrast to pure Si. The similarity in SiC is attributed to SiC/SiO 2 interfacial reactions producing the necessary conditions for passive scale formation (active-to-passive) or passive scale breakdown (passive-to-active). Comparable results were obtained in both the O 2/Ar and reduced total O 2 pressure cases for SiC. © 2010 Springer Science+Business Media, LLC (outside the USA). Source


Huling S.G.,U.S. Environmental Protection Agency | Kan E.,National Research Council Italy | Kan E.,Montana State University | Caldwell C.,East Central University | Park S.,East Central University
Journal of Hazardous Materials | Year: 2012

Three columns containing granular activated carbon (GAC) were placed on-line at a ground water pump and treat facility, saturated with methyl tert-butyl ether (MTBE), and regenerated with hydrogen peroxide (H 2O 2) under different chemical, physical, and operational conditions for 3 adsorption/oxidation cycles. Supplemental iron was immobilized in the GAC (≈6g/kg) through the amendment of a ferrous iron solution. GAC regeneration occurred under ambient thermal conditions (21-27°C), or enhanced thermal conditions (50°C). Semi-continuous H 2O 2 loading resulted in saw tooth-like H 2O 2 concentrations, whereas continuous H 2O 2 loading resulted in sustained H 2O 2 levels and was more time efficient. Significant removal of MTBE was measured in all three columns using $(USD) 0.6 H 2O 2/lb GAC. Elevated temperature played a significant role in oxidative treatment, given the lower MTBE removal at ambient temperature (62-80%) relative to MTBE removal measured under thermally enhanced (78-95%), and thermally enhanced, acid pre-treated (92-97%) conditions. Greater MTBE removal was attributed to increased intraparticle MTBE desorption and diffusion and higher aqueous MTBE concentrations. No loss in the MTBE sorption capacity of the GAC was measured, and the reaction byproducts, tert-butyl alcohol and acetone were also degraded. © 2011. Source


Klippenstine M.A.,East Central University | Schuller R.,York University
Psychology, Crime and Law | Year: 2012

The present research examined how expectancies for a complainant's emotional response and the consistency of her emotional response over time impact perceptions of sexual assault. Participants (N = 124) were given one of four trial summaries in which the victim's emotional response (i.e. tearful/upset, calm/controlled) was varied at two points in time (i.e. day following the alleged assault, during trial). Similar to past findings, more support for the victim's claim was evidenced when she was portrayed as tearful/upset as opposed to calm/controlled, with participants' perceptions negatively influenced by emotional information that was incongruent with what would be considered typical of a sexual assault victim. Further analyses revealed, however, that emotions displayed at different points interacted to influence perceptions, with the consistently responding victim tending to receive more support for her claim than the victim who responded inconsistently over time. Mediation analyses revealed that the impact of the victim's emotional response on perceptions was mediated by the perceived typicality of her response. Implications of the research suggest, for both psychological and legal professionals alike, that it is incumbent upon those receiving information regarding a rape victim's emotional response to be more aware of its limited value and its potential prejudicial impact. © 2012 Taylor and Francis Group, LLC. Source


Liu X.,National Research Council Italy | Chen G.,National Research Council Italy | Erwin J.G.,East Central University | Su C.,U.S. Environmental Protection Agency
Environmental Pollution | Year: 2014

Surface transformation can affect the stability, reactivity, and toxicity of titanium dioxide (TiO2) nanoparticles (NPs) in water environments. Herein, we investigated the release kinetics of Si impurity frequently introduced during NP synthesis and the resulting effect on TiO2 NP transformation in aqueous solutions. The release of Si increased from 2 h to 19 d at three pHs with the order: pH 11.2 ≥ pH 2.4 > pH 8.2. The Si release process followed parabolic kinetics which is similar to diffusion controlled dissolution of minerals, and the release magnitude followed the order: 10 × 40 nm rutile > 50 nm anatase > 30 × 40 nm rutile. FTIR data indicated preferential dissolving of less polymerized Si species on NP surface. Surface potential and particle size of TiO2 NPs remained almost constant during the 42-day monitoring, implying the unaffected stability and transport of these NPs by the incongruent dissolution of impurities. © 2013 Elsevier Ltd. All rights reserved. Source

Discover hidden collaborations