Progress on the Ohio State University Get Away Special G-0318: DEAP

The Get Away Special program became a major presence at the Ohio State University with the award of GAS-0318 by the American Institute of Aeronautics and Astronautics. There are some twenty engineering researchers and students currently working on the project. GAS-0318 payload is an experimental manufacturing process known as Directional Electrostatic Accretion Process (DEAP). This high precision portable microgravity manufacturing method will revolutionize the manufacture and repair of spacecraft and space structures. The cost effectiveness of this process will be invaluable to future space development and exploration

Isolation and Characterisation of Staphylococcus aureus Strains from Phyllo Dough (Yufka) in Burdur Province

In this study, 11 Staphylococcus aureus isolates were isolated and characterized by molecular methods from 50 phylo dough samples. Antimicrobial susceptibility testing against 12 antibiotics was performed by agar disk diffusion method and resistance was detected in 10 strains. 3 strains were oxacillin resistant which are also considered as methicillin-resistant S. aureus. Biofilm formation test were carried out by microplate test in TSB, TSB+1% sucrose, TSB+1% glucose, TSB+4% NaCl and BHI, BHI+1% sucrose, BHI+1% glucose and BHI+4%NaCl and biofilm formation detected in 4 strains. Coa, nuc and spa genes were evaulated for molecular identification.  Enterotoxin A, B, C, D, and E genes, toxic shock syndrome toxin gene (tst) and mecA gene were investigated. MecA gene not detected, enterotoxin genes detected in 10 strains and tst gene detected in 9 strains. Our study confirmed that possible contamination and transmission of antibiotic resistant S. aureus from phyllo dough.&nbsp

Master of Science

thesisCoal gasification temperature distribution in the gasifier is one of the important issues. High temperature may increase the risk of corrosion of the gasifier wall or it may cause an increase in the amount of volatile compounds. At the same time, gasification temperature is a dominant factor for high conversion of products and completing the reactions during coal gasification in a short time. In the light of this information it can be said that temperature is one of key parameters of coal gasification to enhance the production of high heating value syngas and maximize refractory longevity. This study aims to predict the adiabatic flame temperatures of Australian bituminous coal and Indonesian roto coal in an entrained flow gasifier using different operating conditions with the ChemCAD simulation and design program. To achieve these objectives, two types of gasification parameters were carried out using simulation of a vertical entrained flow reactor: (1) oxygen-to-coal feed ratio by kg/kg and pressure and (2 ) steam-to-coal feed ratio by kg/kg and pressure. In the first part of study the adiabatic flame temperatures, coal gasification products and other coal characteristics of two types of coals were determined using ChemCAD software. During all simulations, coal feed rate, coal particle size, initial temperature of coal, water and oxygen were kept constant. The relationships between flame temperature, coal gasification products and operating parameters were fundamentally investigated. The second part of this study addresses the modeling of the flame temperature relation to methane production and other input parameters used previous chapter. The scope of this work was to establish a reasonable model in order to estimate flame temperature without any theoretical calculation. Finally, sensitivity analysis was performed after getting some basic correlations between temperature and input variables. According to the results, oxygen-to-coal feed ratio has the most influential effect on adiabatic flame temperature

A novel approach in formulation of special transition elements: Mesh interface elements

The objective of this research program is in the development of more accurate and efficient methods for solution of singular problems encountered in various branches of mechanics. The research program can be categorized under three levels. The first two levels involve the formulation of a new class of elements called 'mesh interface elements' (MIE) to connect meshes of traditional elements either in three dimensions or in three and two dimensions. The finite element formulations are based on boolean sum and blending operators. MEI are being formulated and tested in this research to account for the steep gradients encountered in aircraft and space structure applications. At present, the heat transfer and structural analysis problems are being formulated from uncoupled theory point of view. The status report: (1) summarizes formulation for heat transfer and structural analysis; (2) explains formulation of MEI; (3) examines computational efficiency; and (4) shows verification examples

Specialty functions singularity mechanics problems

The focus is in the development of more accurate and efficient advanced methods for solution of singular problems encountered in mechanics. At present, finite element methods in conjunction with special functions, boolean sum and blending interpolations are being considered. In dealing with systems which contain a singularity, special finite elements are being formulated to be used in singular regions. Further, special transition elements are being formulated to couple the special element to the mesh that models the rest of the system, and to be used in conjunction with 1-D, 2-D and 3-D elements within the same mesh. Computational simulation with a least squares fit is being utilized to construct special elements, if there is an unknown singularity in the system. A novel approach is taken in formulation of the elements in that: (1) the material properties are modified to include time, temperature, coordinate and stress dependant behavior within the element; (2) material properties vary at nodal points of the elements; (3) a hidden-symbolic computation scheme is developed and utilized in formulating the elements; and (4) special functions and boolean sum are utilized in order to interpolate the field variables and their derivatives along the boundary of the elements. It may be noted that the proposed methods are also applicable to fluids and coupled problems

AN ANALYTIC LOOK AT A LANGUAGE COURSE DESIGN MODEL

This study aims to qualitatively examine and elaborate on the characteristics of the course design model devised by Graves (2000). Drawing upon the traditional components and principals of instructional design, Graves’ course design model is innovative or different in that it has been more specially developed for language course design purposes and thus is believed to be more suited to the nature of language courses with its consideration of the main elements or characteristics of language teaching and learning processes. This descriptive study centers upon the seven main examination criteria, which are in fact the main procedures as suggested by Graves (2000). These are a) defining context, b) conceptualizing content, c) organizing the course, d) formulating goals and objectives, e) assessing needs, f) developing materials and finally g) designing an assessment plan. In this essence, each criterion was first introduced and explained in detail before the researchers extend their critical outlook into the functionality and practical use of the relevant steps and strategies recommended by Graves (2000). This critical analysis and review on the Graves’ course design model revealed that the model employs the traditional components of the ADDIE generic and lends itself well also to be used in the other disciplines other than foreign languages. The final part of this report will provide suggestions as regards the potential application of the model specifically in English language curriculum development and more broadly in the curriculum and course development procedures pertaining to other discipline areas.Keywords: course design model, English language teaching, instructiona

Descripción de una asociación multitaxones del Triásico Superior de Post-Quarry de Texas (Grupo Dockum), incluyendo un nuevo taxón de pequeño Dinosauriformes basal

Una asociación ósea de diminutos fragmentos craneanos y postcraneanos de diferentes individuos es aquí descripto. Los especímenes provienen de la bien conocida localidad fosilífera del Triásico Tardío de Post Quarry, Texas, USA. Los elementos esqueletarios pertenecen a diversos archosauromorfos y saurios, incluyendo una columna vertebral parcial asignable a Vancleavea campi y un dentario referido a un nuevo género y especie de pequeño dinosauriformes basal. Implantación anquilotecodonte de los dientes en el dentario indica afinidades fuertes con Silesauridae. Un basicráneo fragmentario de arcosauromorfos constituye un elemento curioso de la asociación. Este ejemplar exhibe un marcado contraste entre un otoccipital muy derivado y un basioccipital con rasgos plesiomórficos. La pobre preservación de la mayor parte de los elementos esqueletarios impide asignaciones taxonómicas más acotadas. El grado de desgaste y la mezcla de esta asociación osteológica reflejan las complejidades de la tafonomía de los tetrápodos terrestres de Dockum.A bone assemblage composed of intermixed small cranial and postcranial fragments from the Post Quarry of Texas, USA, is described. The skeletal elements represent multiple individuals of different taxa, including a partial dorsal column assigned to Vancleavea campi and an incomplete dentary referred to a new genus and species of a small-sized basal dinosauriform. Ankylothecodont dental implantation of the dinosauriform dentary bears strong resemblance to silesaurids. A fragmentary archosauromorph braincase is another intriguing element of the assemblage; it displays a striking contrast of a derived otoccipital on a plesiomorphic basioccipital. Poor preservation prevents more conclusive taxonomic assignments for the rest of the skeletal elements. The observed attrition and entangling in this bone assemblage reflect the complexities of the Dockum land tetrapod taphonomy.Fil: Sarigul, Volkan. University Of Texas. Departament Of Physics; Estados UnidosFil: Agnolin, Federico. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina. Fundación de Historia Natural Félix de Azara; ArgentinaFil: Chatterjee, Sankar. University Of Texas. Departament Of Physics; Estados Unido

Frequency Effects in Second Language Acquisition: An Annotated Survey

The aim of this study is to investigate the relationship between frequency and language acquisition from many perspectives including implicit and explicit instruction, frequency effects on morpheme acquisition in L2, the relationship between frequency and multi-word constructions, frequency effects on phonetics, vocabulary, gerund and infinitive constructions, bitransitive constructions, and so on. In his impressive article on frequency, Ellis (2002a) asked this crucial question about the relationship between frequency and SLA: “How exactly does the frequency of patterns in the input affect acquisition?” Another fundamental question that needs to be answered is: “What purpose does frequency serve in language acquisition?” In addition, frequency and range are said to be the most salient criteria for determining the general usefulness of a word (Koprowski, 2005). Moreover, both corpus and experimental data suggest that frequency has significant effects on second language acquisition. These questions and arguments, which constitute the foundation of frequency studies in second language acquisition, led and guided this study. This annotated survey, summarizing the studies on frequency effects on L2 learning, shows that there are still lots of ways to go with research on the relationship between frequency and second language acquisition in the literature. Some pedagogical implications are discussed with recommendations for the stakeholders of foreign language contexts (i.e. curriculum designers, coursebook writers, language teachers and learners)

Synthesis and growth of solution-processed chiral perovskites

In materials science, chiral perovskites stand out due to their exceptional optoelectronic properties and the versatility in their structure and composition, positioning them as crucial in the advances of technologies in spintronics and chiroptical systems. This review underlines the critical role of synthesizing and growing these materials, a process integral to leveraging their complex interplay between structural chirality and distinctive optoelectronic properties, including chiral-induced spin selectivity and chiroptical activity. The paper offers a comprehensive summary and discussion of the methods used in the synthesis and growth of chiral perovskites, delving into extensive growth techniques, fundamental mechanisms, and strategic approaches for the engineering of low-dimensional perovskites, alongside the creation of novel chiral ligands. The necessity of developing new synthetic approaches and maintaining precise control during the growth of chiral perovskites is emphasized, aiming to enhance their structural chirality and boost their efficiency in spin and chiroptical selectivity