1,270 Matching Results

Search Results

Advanced search parameters have been applied.

Effect of fiber orientation on ball failures under rolling-contact conditions

Description: The rolling-contact fatigue spin rig was used to test balls of a bearing steel at maximum Hertz stresses of 600,000 to 750,000 psi. The effect of fiber orientation was observed with the ball track restricted to passing directly over the poles, coincident with the equator, or randomly around the ball. The polar areas were found to be weaker in fatigue than the nonpolar areas. This resulted in a much greater portion of the failures occurring in the polar areas than would be expected from a homogeneous material. The early failures are discussed.
Date: February 1957
Creator: Butler, Robert H.; Bear, H. Robert & Carter, Thomas L.
Partner: UNT Libraries Government Documents Department

Effect of fiber orientation in races and balls under rolling-contact fatigue conditions

Description: Report presenting a study of the effect of fiber orientation on fatigue life for both races and balls in the fatigue spin rig. In both balls and races, a concentration of fatigue failures was observed in that portion of the specimens with the highest angle of intersection of fiber flow lines from the surface.
Date: February 1958
Creator: Carter, Thomas L.
Partner: UNT Libraries Government Documents Department

An Analysis of Criteria for Orientation in Public Junior Colleges as Perceived by Three Groups

Description: The problem of this study was to analyze the perceptions held by the following three groups concerning orientation criteria for public junior colleges: (1) a random sample of authorities in the field of orientation, (2) a random sample of public junior college presidents, and (3) a random sample of orientation directors of public junior colleges.
Date: June 1970
Creator: Kerbel, Larry Dean
Partner: UNT Libraries

Person Orientation of College Students' Vocational Interests as a Function of their Parents' Perceptions of Parent-Child Interactions

Description: This study investigated what relationship might exist between the parents' view of their interactions with their children and the degree of person orientation in their children's vocational interests. The hypotheses of this study were that the parents of subjects with toward-person-oriented vocational interests would perceive their interactions with their children as being more loving and overtly attentive than parents of subjects with away-from-person-oriented vocational interests. It was further hypothesized that these differences would be greater for males than for females.
Date: December 1971
Creator: Price, Jack Randall
Partner: UNT Libraries

Allergen Research and Its Implications for Psychology: History, Current Status, and Prospectus

Description: The purpose of this manuscript was to present a brief history, the current status, and a prospectus of allergen and allergic reactions. Research on allergic reactions, particularly as viewed from the psychogenic position, was presented. The review strongly suggests that the psychogenic orientation has been frought with contradictions, unnecessarily complex interpretations, and an over-abundance of subjective, dynamic, and analytic redundancies which have done little more than perpetuate the stagnation of a rather important subdomain of the "mental" health professions.
Date: August 1973
Creator: Arnold, J. Steven
Partner: UNT Libraries

The Effect of a Special Orientation Program for Entering Freshmen on Attrition, Satisfaction, and Grade Point Average

Description: This study was initiated to assess the effectiveness of a special orientation program with the purpose of reducing the anxiety of entering freshmen and easing their adjustment to the campus environment. The criteria of evaluation were retention, satisfaction, and academic achievement. The 468 subjects were first-time freshmen from outside Tarrant County entering Texas Christian University in the fall of 1980. Half of the subjects participated in the experimental program, Operation Welcome, and the other half served as a control group. Those in Operation Welcome were grouped in teams with eight other freshmen, two upperclassmen serving as a big brother and big sister, and a local alumni family. Each of the freshmen in the program received letters of welcome prior to leaving home and participated in special events upon arrival on campus.
Date: August 1980
Creator: Patton, Carol R. (Carol Rogers)
Partner: UNT Libraries

Graphene Layer Growth Chemistry: Five-Six-Ring Flip Reaction

Description: Reaction pathways are presented for hydrogen-mediated isomerization of a five and six member carbon ring complex on the zigzag edge of a graphene layer. A new reaction sequence that reverses orientation of the ring complex, or 'flips' it, was identified. Competition between the flip reaction and 'ring separation' was examined. Ring separation is the reverse of the five and six member ring complex formation reaction, previously reported as 'ring collision'. The elementary steps of the pathways were analyzed using density-functional theory (DFT). Rate coefficients were obtained by solution of the energy master equation and classical transition state theory utilizing the DFT energies, frequencies, and geometries. The results indicate that the flip reaction pathway dominates the separation reaction and should be competitive with other pathways important to the graphene zigzag edge growth in high temperature environments.
Date: December 1, 2007
Creator: Whitesides, R.; Domin, D.; Salomon-Ferrer, R.; Lester Jr., W.A. & Frenklach, M.
Partner: UNT Libraries Government Documents Department

Inferences of sexual orientation and gender role based on clothing and posture

Description: This study investigated the effect of clothing, posture, and sex of subject on inferences concerning sexual orientation and gender role. Subjects were a convenience sample of 327 students. The study wa sa 2 (masculine/feminine clothing) X 2 (masculine/feminine posture) X2 (sex of subject) between subject experimental design. Perceptions of sexual orientation were measured by a single item anchored at one end by homosexual and the other end by not homosexual.
Date: August 1992
Creator: Wiens, Paul A. (Paul Anthony)
Partner: UNT Libraries

Characterization of three dimensional fiber orientation in short-fiber composites

Description: A mathematical procedure for recovering from image analysis the three dimensional nonsymmetric fiber-orientation distribution in short-fiber composites is proposed. Microphotographs from two orthogonal faces of a composite sample are needed to determine the three dimensional fiber orientation. A simple weighting function is derived to take into account the probability of intercepting fibers at varying inclination angles. The present procedure improves the previous works of other researchers in the following two aspects. First, it can obtain the single-angle fiber-orientation distribution from one micrograph in reference to the normal of the photographed surface. This distribution is often needed in predicting the mechanical and physical properties of short-fiber composites in this direction. Second, no symmetry in fiber-orientation distribution is assumed in the determination of the three dimensional fiber-orientation, which makes the present procedure more practical and versatile.
Date: May 1, 1995
Creator: Zhu, Yuntian T. & Blumenthal, W.R.
Partner: UNT Libraries Government Documents Department

Regulatory Orientation, Message Framing and Influences of Fit on Customer Behaviors

Description: Existing literature on consumer behavior has argued that an individual’s regulatory orientation interacts with message framing. If there is a match between regulatory orientation (promotion versus prevention) and message framing, this results in positive attitudes toward a given advertisement. Conversely, if there is a mismatch, the effect is opposite, i.e., attitudes toward that advertisement are less positive and less favorable. This research extends the term of compatibility by examining how regulatory focus moderates the impact of two aspects of message framing (attribute framing and risky choice framing) on customer perceptions. It also examines whether regulatory fit is created when there are interactions between individuals’ regulatory orientation and message framing and how the fit changes customer perceptions about a message. Specifically, this dissertation provides answers to the following questions: (1) does regulatory fit take place when regulatory focus is compatible with two aspects of message framing (attribute and risky choice)?; (2) does regulatory fit take place when one aspect of message framing (attribute) is compatible with the other (risky choice)?; and (3) how do customer perceptions change if customers experience regulatory fit? The results show that the effects of utilitarian attributes and national brands are dominating and that both promotion- and prevention-oriented customers have higher perceptions of these attributes and brands. The findings of this study have both theoretical and practical implications. Theoretically, this study should enhance our understanding of regulatory focus theory. Practically, the results should provide marketers with more insights into the correlation between message framing and regulatory orientation and the effect of fit on message persuasion, enabling them to develop more effective marketing strategies.
Date: August 2012
Creator: Tran, Trang Phuc
Partner: UNT Libraries

Keep Calm and Play On: The Effects of Grit, Mindfulness, and Goal Orientation on Sport Anxiety and Performance

Description: Achievement motivation theory suggests there are two primary approaches to achievement tasks: to appear competent or to develop a skill. These two different approaches to performance yield different affective and behavioral responses. Athletes holding a performance goal orientation tend to respond to challenges with behaviors exemplifying learned helplessness and increased anxiety. Athletes holding a mastery goal orientation tend to respond to challenges with greater effort and experience less sport-related anxiety. Individual athlete factors, such as grit, mindfulness, and achievement orientation may influence how athletes experience their environment and their levels of sport anxiety, and may interact with athletes' achievement motives to influence performance. I used hierarchical multiple regressions to test the main effects of feedback and mindfulness, and feedback and goal orientation, to determine if either mindfulness or goal orientation moderated the effects of feedback on performance. I also used simple regression to determine the relative predictive strength of mindfulness, grit, and goal orientation on athletes' experience of sport anxiety. Mindfulness, but not goal orientation, was a significant moderator of the feedback-shooting performance relationship, but particularly for athletes low in mindfulness; mastery-goal orientation, independently of feedback, was also a significant predictor of task performance. Mindfulness also emerged as the strongest predictor of reduced sport anxiety. These results suggest that, for athletes low in mindfulness, mastery-involving feedback may be especially helpful. Further, mindfulness may also reduce athlete's sport-related concentration disruption, worry, and somatic anxiety.
Date: August 2018
Creator: Auerbach, Alex
Partner: UNT Libraries

Pilot's loss of orientation in inverted spins

Description: Note presenting a discussion of the nature of inverted spins, the optimum control technique for recovery, and some of the apparent reasons for a pilot's loss of orientation, which can lead to accidents. Results regarding testing in the free-spinning-tunnel, airplane experiences, and a description of a new spinning simulator rig designed to investigation the orientation loss problem are provided.
Date: October 1955
Creator: Scher, Stanley H.
Partner: UNT Libraries Government Documents Department

The Student Non-Discrimination Act (SNDA): A Legal Analysis

Description: This report discusses current laws that prohibit discrimination, in education, and continues with an analysis of the specific provisions contained in the Student Non-Discrimination Act (SNDA), including provisions relating to coverage, prohibited acts, and enforcement and remedies under the proposed legislation.
Date: May 9, 2013
Creator: Feder, Jody
Partner: UNT Libraries Government Documents Department

A descriptive analysis and evaluation of an orientation course designed for junior college students

Description: This study was a descriptive analysis of the orientation program for a large junior college in the Dallas/Fort Worth Metroplex. Its purposes were (1) to describe the freshman orientation course, (2) to analyze data compiled from rating forms which recorded student perceptions of each aspect of the course, and (3) to discuss the implications of the data for junior college student service personnel as they attempt to establish programs that will effectively aid students in making a successful adjustment to college.
Date: May 1976
Creator: Dickson, Mary Jane Ramsey
Partner: UNT Libraries

Sculpting the shape of semiconductor heteroepitaxial islands: fromdots to rods

Description: In the Ge on Si model heteroepitaxial system, metal patterns on the silicon surface provide unprecedented control over the morphology of highly ordered Ge islands. Island shape including nanorods and truncated pyramids is set by the metal species and substrate orientation. Analysis of island faceting elucidates the prominent role of the metal in promoting growth of preferred facet orientations while investigations of island composition and structure reveal the importance of Si-Ge intermixing in island evolution. These effects reflect a remarkable combination of metal-mediated growth phenomena that may be exploited to tailor the functionality of island arrays in heteroepitaxial systems.
Date: June 20, 2006
Creator: Robinson, J.T.; Walko, D.A.; Arms, D.A.; Tinberg, D.S.; Evans,P.G.; Cao, Y. et al.
Partner: UNT Libraries Government Documents Department

Influence of shockwave obliquity on deformation twin formation in Ta

Description: Energetic loading subjects a material to a 'Taylor wave' (triangular wave) loading profile that experiences an evolving balance of hydrostatic (spherical) and deviatoric stresses. While much has been learned over the past five decades concerning the propensity of deformation twinning in samples shockloaded using 'square-topped' profiles as a function of peak stress, achieved most commonly via flyer plate loading, less is known concerning twinning propensity during non-I-dimensional sweeping detonation wave loading. Systematic small-scale energetically-driven shock loading experiments were conducted on Ta samples shock loaded with PEFN that was edge detonated. Deformation twinning was quantified in post-mortem samples as a function of detonation geometry and radial position. In the edge detonated loading geometry examined in this paper, the average volume fraction of deformation twins was observed to drastically increase with increasing shock obliquity. The results of this study are discussed in light of the formation mechanisms of deformation twins, previous literature studies of twinning in shocked materials, and modeling of the effects of shock obliquity on the evolution of the stress tensor during shock loading.
Date: January 1, 2009
Creator: Gray Iii, George T; Livescu, V; Cerreta, E K; Mason, T A; Maudlin, P J & Bingert, J F
Partner: UNT Libraries Government Documents Department

Magnetic structure near the Co/NiO(001) interface

Description: We investigate the magnetic coupling at the Co/NiO interface using soft x-ray magnetic linear dichroism (XMLD) and circular dichroism taking explicitly into account the recently observed angular dependence of the XMLD with respect to the crystallographic axes. We find that the Co moments are aligned perpendicular to the NiO moments. We discuss the impact of the anisotropic XMLD on the intensity ratio of the two peaks at the Ni L{sub 2} edge, which is commonly employed to determine the spin orientation in antiferromagnets using XMLD.
Date: August 29, 2008
Creator: Arenholz, Elke; van der Laan, Gerrit & Nolting, Frithjof
Partner: UNT Libraries Government Documents Department

Surprising Coordination Geometry Differences in Ce(IV)- and Pu(IV)-Maltol Complexes

Description: As part of a study to characterize the detailed coordination behavior of Pu(IV), single crystal X-ray diffraction structures have been determined for Pu(IV) and Ce(IV) complexes with the naturally-occurring ligand maltol (3-hydroxy-2-methyl-pyran-4-one) and its derivative bromomaltol (5-bromo-3-hydroxy-2-methyl-pyran-4-one). Although Ce(IV) is generally accepted as a structural analog for Pu(IV), and the maltol complexes of these two metals are isostructural, the corresponding bromomaltol complexes are strikingly different with respect to ligand orientation about the metal ion: All complexes exhibit trigonal dodecahedral coordination geometry but the Ce(IV)-bromomaltol complex displays an uncommon ligand arrangement not mirrored in the Pu(IV) complex, although the two metal species are generally accepted to be structural analogs.
Date: February 12, 2008
Creator: Laboratory, Lawrence Berkeley National; Raymond, Kenneth; Szigethy, Geza; Xu, Jide; Gorden, Anne E.V.; Teat, Simon J. et al.
Partner: UNT Libraries Government Documents Department

Growth and Structure of Metallic Barrier Layer and Interconnect Films I: Experiments

Description: We present experimented results directed at understanding the growth and structure of metallic barrier layer and interconnect films. Numerical simulation results associated with this experimental work are presented in an accompanying paper in these proceedings. Here, thin films of Al, Ti, Cu and Ta have been grown by magnetron sputtering onto oxidized Si substrates. Using a specially-constructed substrate holder, the orientation of the substrate with respect to the growth direction was varied from horizontal to vertical. Films were grown at both low and high argon pressure; in the case of Ta, the cathode power was varied as well. The film structure and in particular the surface roughness was measured by X-ray reflectance and also by atomic force microscopy. We find that the surface roughness increases markedly with orientation angle in the case of Ta and Cu films, and in Ti films grown at high argon pressure. At low pressure, however, the Ti film surface roughness remains constant for all substrate orientations. No variation in roughness with either orientation angle or argon pressure was observed in the Al films. These results suggest that, under certain circumstances, shadowing effects and/or grain orientation (i.e., texture) competition during growth can give rise to lower density, more porous (and thus more rough) films, particularly at large orientation angles, as on sidewalls in sub-micron trenches.
Date: April 5, 1999
Creator: Baumann, F.H.; Gilmer, G.H.; O'Sullivan, P.L.; Sapjeta, J.; Torre, J.D. & Windt, D.L.
Partner: UNT Libraries Government Documents Department