34 research outputs found
Co-deformation of a two-phase FCC/BCC material
No full textThe drive to produce materials with novel or beneficial combinations of properties has prompted research into a range of new materials and processing routes. In many applications one of the important design variables is the mechanical strength. Exceptional strengths can be achieved in certain materials consisting of two deformable phases when they are drawn into fine wires or rolled into thin sheets, the common example being pearlitic steel wire which can achieve strengths in excess of 5 GPa. The mechanisms that permit co-deformation and result in the observed strengthening are, however, not well understood. In this thesis an approach was adopted whereby co-deformation of a well characterized model material has been studied primarily using uniaxial tensile tests. Directional solidification of a Cu-1.56at%Cr eutectic alloy has been used to produce material consisting of submicron diameter single crystals of Cr embedded within a polycrystalline Cu matrix. It has been shown that these two phases exhibit preferred crystallographic orientation relationships, habit planes and growth directions the same as those found for solid state precipitates of Cr in Cu. On deforming this material it is found that the Cr fibres yield at stresses close to the theoretical limit. However, their are able to continue to co-deform with the Cu matrix to large plastic strains. This process of co-deformation is observed to cause a rate of nearly constant work hardening that results in both high strength and high ductility. This behaviour has been attributed to the fact that the Cr fibres continue to carry increasing elastic strain beyond their yield thereby contributing to an increasing level of internal stress in the material. It is suggested that this mechanism may play an important role in other co-deformed two phase materials. In particular, it is suggested that this may provide one mechanism for the continued high rate of work hardening in heavily co-deformed two phase materials.Doctor of Philosophy (PhD
Huntsville Times sleeve HT0003532
No full textChildren's author - illustrator Bill Joyce. He'll be signing books. Can get photo of just him or of him with fan(s). / Books-A-Million / Airport Road / Weatherly Elementary 5th / Amber Graffeo / Nancy Jone
The effects of precipitation and river runoff anomalies in a coupled ice-ocean model of the Arctic
No full textA coupled ice-ocean model of the Arctic Ocean and adjacent seas is developed in order to study the effects of anomalies of precipitation and river runoff on sea ice. A dynamic-thermodynamic sea ice model is coupled to an ocean general circulation model which includes a turbulence closure scheme for the treatment of stability-dependent vertical mixing of temperature, salinity, and momentum. The ice and ocean models are coupled by the fluxes of heat, momentum, and salinity computed from the predicted ice and ocean temperatures, velocities, and net ice growth. The model is forced by interannually-varying atmospheric temperature and pressure data from 1980-1989, parameterized incoming radiation, and hydrologic forcing from precipitation and river runoffs. The modeled ice thickness, ice extent, and ice drift are generally similar to observed patterns, with a bias toward thinner ice and some regional differences in extent, which reduces the export of ice out of the Arctic. The ice extent is shown to be sensitive to the ocean heat flux computed in the model. Ice thickness and sea surface salinity are shown to be very sensitive to how the vertical mixing scheme in the ocean maintains the strong stratification. Sensitivity experiments show that without any precipitation input, sea ice thickness decreases rapidly because of the destabilization of the upper ocean. Eliminating the river runoffs causes a much slower decreasing trend in ice thickness, due to the decadal timescale of the dispersal of runoff in the Arctic Ocean. Interannual precipitation anomalies are shown to create anomalies of ice thickness that last 1-2 years, while runoff anomalies do not produce significant ice anomalies. The ice-ocean model results suggest that changes in arctic precipitation can affect sea ice more rapidly and more significantly than river runoffs, although rivers contribute the greater volume of fresh water to the Arctic, and that river runoffs can affect the sea ice on the timescale of a decade.Made available in DSpace on 2011-05-07T13:13:44Z (GMT). No. of bitstreams: 2
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S.T.A.R. Performance: A Quantitative Exploration of Behavioral Responses to Simulated Selection Interviews
No full textProspective employers primarily utilize the traditional job interview format to screen and hire new employees (Kwon, Powell, & Chalmers, 2013; Posthuma, Moregeson, & Campion, 2002; Young & Kacmar, 1998). Thus, the employment interview has been the focus of extensive research. Topics have included the predictive value of the interview process (McCarthy & Goffin, 2004), the influence of social media on the candidate selection process (Jennings, Blount & Weatherly, 2014; Roth, Bobko, Van Iddekinge, & Thatcher, 2016), and candidates� attempts to sway recruiters by implementing impression management tactics and recruiters� interpretation of those efforts (Roulin, Bangerter, & Levashina, 2014). Other studies have examined the questions posed by recruiters, generally categorized as behavioral�actions that candidates have taken in the past�and situational�actions that the candidate would likely take in the future. Job applicants are encouraged to encode their responses in formats that recruiters can easily decode. Studies that report how candidates respond to behavioral and situational interview questions have been more theoretical than applied. Although such investigations contribute to the body of knowledge, they may be difficult for the layperson to decode. In simple terms, will John Public or Jane Doe have a comprehensive understanding of how their responses are interpreted by recruiters? The purpose of this article is to provide insight into candidate interview responses
The Platinum Rule Meets the Golden Minimum: Inclusive and Efficient Archival Description of Oral Histories
No full textThis article presents an oral history description methodology, rooted in both extensible processing practices as well as cultural humility, that results in efficiently-processed but richly-described oral history interviews. The author explores three key questions. Is there a way to process oral history to the golden minimum? Is there a way to process oral history ethically, with an empathetic approach to narrators and the communities they originate from or discuss? And is there a way to do both at the same time? In addition to the application of this descriptive methodology, the article examines the archives and oral history professional ethics that guide descriptive practices when working with the narratives of traditionally marginalized and underrepresented groups. The results of the project show that it is not only possible to approach oral histories with inclusivity and efficiency at the fore, but also that archivists can process with both of these principles successfully. Most importantly, doing so can set the foundation for an inclusive and reparative description program
Honoring Transitions: An Examination of Junior and Senior Honors Student Engagement
No full textabstract: This action research study took a mixed methods approach to examine junior and senior student engagement at the honors college in the downtown campus of Arizona State University. The purpose of the study was to better understand the lack of engagement with junior and senior students within the college. The study sought to examine the usage of year specific programs and the possibility of influence on the target populations’ engagement. In addition, the study focused on understanding the usage of such programs and its ability to influence student perception of coping with transitions. The growth of honors education and the value of student engagement lead the study. Life Hacks is a series of programs designed to engage the target population by addressing an anticipated transition. This study focused on exploring junior and senior honors student engagement and the utilization of programs to address the student’s ability to cope with transitions. The program was divided into six workshops that spanned the semester and were taught by college partners who were deemed a resource on the subject matter. Two surveys were deployed: one at the beginning of the semester and the other at the end of the semester. Participants were selected based on their academic status as a junior or senior within the honors college on campus and their age rage. All participants traditionally matriculated from high school and were between the ages of 18-25. Two focus groups, with a total of eight participants (4 juniors and 4 seniors), were conducted at the end of the semester to gather qualitative data. Findings indicated that participants allowed their emotions to influence their ability to cope with transitions. Relationships with peers and staff were important to decision making processes and network building for junior and senior participants. Students within the study set expectations for the college and themselves that influence how they relate to college and their relation to adulthood. The implications of practice that resulted from the study involved improving student access to information and assisting students with understanding the need for the resource and how to apply it to their current and future challenges.Dissertation/ThesisDoctoral Dissertation Educational Leadership and Policy Studies 201
Investigating distributed simulation with COTS simulation packages: Experiences with Simul8 and the HLA
No full textCommercial-off-the-shelf simulation packages (CSPs) are used widely in industry. Several research groups are currently working towards the creation of distributed simulation with these CSPs. The motivations to do this are various and are largely unproven as there are very few good examples of this kind of distributed simulation in practice. Our goal is therefore to create a distributed simulation environment using CSPs that will allow end users to make their own decisions as to whether this technology will be useful. This paper presents continuing research in creating such an environment using the CSP Simul8 and the High Level Architecture, the IEEE 1516 standard for distributed simulation. The scope of this paper is limited to the CSPI-PDG Type I Interoperability Reference Model
THE EFFECTS OF NON-RIGIDITY ON THE HYPERFINE STRUCTURE OF
No full textAuthor Institution: Molecular Spectroscopy Division, National Institute of Standards and TechnologyIn the hyperfine structure arises mainly from the quadrupole coupling of the four deuterium atoms. This dimer also exhibits a large amplitude motion consisting of a geared rotation of the two acetylene subunits, during which each deuterium atom is put in turn into the hydrogen bond, thus leading to a change of the electric field gradient tensor for any given deuterium nucleus. The hyperfine structure of should therefore give us important information on the interaction of the quadrupole coupling with the large amplitude motion. The theoretical approach involves setting up a complete quadrupole Hamiltonian for the four deuterium atoms, which is allowed to depend upon the large amplitude coordinate necessary to fully describe the various configurations of the molecule. The mean value of this operator is then evaluated for each of the tunneling levels, which for acetylene dimer1 take the form of nondegenerate A or B type levels, or doubly degenerate E type levels. The unexpected result is that for nondegenerate tunneling levels the calculation of the mean value leads to an effective hyperfine Hamiltonian which is the sum of four one-deuterium hyperfine Hamiltonians, each with the same effective coupling constant. The group of the permutations of 4 identical particules can be used to classify the hyperfine energy levels, and symmetry adapted wavefuctions can be constructed prior to the diagonalisation of the hyperfine Hamiltonian. Such an approach is similar to the one used by Wolf, Williams and Weatherly for and , except that the number of identical particules is increased by one in the present problem. The particular symmetry properties of the effective hyperfine Hamiltonian will be discussed, and we hope to be able to compare predicted hyperfine patterns with data. G. T. Fraser, R. D. Suenram, F. J. Lovas, A. S, Pine, J. T. Hougen, W. J. Lafferty, and J. S. Muenter, J. Chem. Phys. 89, 6028-6045 (1988). A. A. Wolf, Q. Williams, and T. L. Weatherly, J. Chem. Phys. 47, 5101-5109 (1967)
A Phenomenological Approach to Care Leavers’ Transition to Higher Education
No full textPrevious research conducted in the UK has highlighted issues with the educational experiences of care leavers in general and has suggested that life transitions affect care leavers’ later experiences. However, the participation and achievement of care leavers in education particularly care leavers’ experiences of transitions in education, remains under-researched. This research investigated the educational experiences of nine care leavers studying in their first or second year, at universities across the Greater Manchester and Yorkshire areas of Northern England. Each participant took part in a semi-structured interview relating to their transition to university. Adopting a phenomenological approach, interview transcripts were analysed through Interpretative Phenomenological Analysis (IPA). Three main themes emerged; ‘care leaver identity’, ‘lack of positive care leaver role models’, and ‘corporate versus normal parenting’. The first theme ‘care leaver identity’, investigates what impact being a care leaver has on the participant personally and within their education. The second theme ‘lack of positive care leaver role models’ explores, what effect role models have on care leavers within their educational pursuits, and the final theme ‘corporate versus normal parenting’, investigates care leavers’ perception of what ‘parenting’ means and the nature of the parenting they receive
