The entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file. Title from PDF of title page (University of Missouri--Columbia, viewed on March 25, 2010). Thesis advisor: Dr. Jerry W. Valentine. Vita. Includes bibliographical references.

Thesis (Ph.D.)--University of Iowa, 2006. / Supervisor: Mary Noonan Includes bibliographical references (leaves 170-182).

Thesis (Ph. D.) University of Missouri-Columbia, 2006. / The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on July 31, 2007) Includes bibliographical references.

Thesis (Ph.D.)--University of Nebraska-Lincoln, 2006. / Title from title screen (site viewed April 26, 2007). PDF text: vii, 164 p. : ill. UMI publication number: AAT 3229555. Includes bibliographical references. Also available in microfilm and microfiche formats.

This current study empirically tested elements of Ehlers and Clark's (2000) cognitive model of Posttraumatic Stress Disorder (PTSD) symptom maintenance using path analysis and structural equation modeling (SEM). Ehlers and Clark's model suggests that a reciprocal relationship between cognitive appraisals of the traumatic event and characteristics of the trauma memory maintain symptoms by increasing one's sense of current threat. Participants in the current study were 405 undergraduates at a Midwestern university who each reported having experienced at least one traumatic event during his/her lifetime. Path analysis was utilized to examine the possibility that one's posttraumatic cognitions may mediate the relationship between the centrality of the traumatic event to one's sense of self and one's current level of PTSD symptoms. The reverse mediation was also tested for each of the PTSD symptom clusters. Results indicate that both event centrality and posttraumatic cognitions are unique and independent predictors of current symptom level. SEM procedures were used to examine possible mediation as well as to test a reciprocal relationship between these predictors. Results are generally consistent with those from the path analysis although additional research is necessary before any firm conclusions can be stated. Overall, the results of this study support aspects of the cognitive model of PTSD; cognitive appraisals of the self and memory characteristics of the event were highly related to levels of distress. However, the current study suggests that overly integrated trauma memories lead to greater distress and not poorly integrated ones as suggested by Ehlers and Clark. The relationship between trauma memories and PTSD is in need of further study as is the role of memory and cognitions in the temporal development of PTSD.

L’objet de la thèse est l’étude des fonctions de mentor exercées par les maîtres d’apprentissage du secteur artisanal. Cette question répond aux difficultés rencontrées par les dirigeants de TPE à fidéliser les nouveaux collaborateurs formés en apprentissage dans un secteur confronté à une pénurie structurelle de main d’œuvre qualifiée. À partir de la théorie de l’échange social, la thèse se focalise sur les effets du mentorat sur l’intention de quitter. Deux mécanismes ont été identifiés et explorés empiriquement : le mécanisme de clarification des valeurs et le mécanisme médiateur d’engagement. Ce double mécanisme opérant à la fois aux niveaux organisationnel et occupationnel a permis de saisir suivant quelles modalités les fonctions de mentorat, en particulier l’activité de role model, influencent positivement la rétention des apprentis à court terme dans l’entreprise et à long terme dans le métier. 230 apprentis des compagnons du devoir ont été interrogés par questionnaires, 6 mois après leur entrée en entreprise. Les données ainsi recueillies ont fait l’objet d’un traitement statistique par la méthode des équations structurelles / The purpose of this thesis is to study the mentoring functions exercised by apprenticeship masters in the craft industry. This issue echoes the difficulties small business leaders may have to retain new staff trained through apprenticeship in a trade suffering from a structural shortage of qualified workforce. Drawing on social exchange theory, this thesis focuses on the impact of mentoring on the intent to leave. Two mechanisms have been identified and empirically explored: the values clarity mechanism and the mediating commitment mechanism. This double mechanism, operating on both the organizational and occupational level, was instrumental in the understanding of how mentoring functions, and the role model activity in particular, have a positive impact on short-term apprentice retention in the business, and long-term retention in the profession. 230 French Compagnons apprentices have been interviewed with questionnaires after 6 months in the business. The collected data has been processed statistically using the structural equation modeling approach

abstract: Statistical mediation analysis allows researchers to identify the most important the mediating constructs in the causal process studied. Information about the mediating processes can be used to make interventions more powerful by enhancing successful program components and by not implementing components that did not significantly change the outcome. Identifying mediators is especially relevant when the hypothesized mediating construct consists of multiple related facets. The general definition of the construct and its facets might relate differently to external criteria. However, current methods do not allow researchers to study the relationships between general and specific aspects of a construct to an external criterion simultaneously. This study proposes a bifactor measurement model for the mediating construct as a way to represent the general aspect and specific facets of a construct simultaneously. Monte Carlo simulation results are presented to help to determine under what conditions researchers can detect the mediated effect when one of the facets of the mediating construct is the true mediator, but the mediator is treated as unidimensional. Results indicate that parameter bias and detection of the mediated effect depends on the facet variance represented in the mediation model. This study contributes to the largely unexplored area of measurement issues in statistical mediation analysis. / Dissertation/Thesis / Masters Thesis Psychology 2016

abstract: Relational turbulence theory (RTT) has primarily explored the effects of relational uncertainty and partner interdependence on relational outcomes. While robust, the theory fails to account for uncertainties and perceived interdependence stemming from extra-dyadic factors (such as partners’ social networks). Thus, this dissertation had two primary goals. First, scales indexing measures of social network-based relational uncertainty (i.e., network uncertainty) and social network interdependence are tested for convergent and divergent validity. Second, measurements of network uncertainty and interdependence are tested alongside measures featured in RTT to explore predictive validity. Results confirmed both measurements and demonstrated numerous significant relationships for turbulence variables. Discussions of theoretical applications and future directions are offered. / Dissertation/Thesis / Doctoral Dissertation Communication Studies 2018

Submitted by Leonardo Freitas (leonardo.hfreitas@ufpe.br) on 2015-04-10T14:27:21Z No. of bitstreams: 2 Tese Marcos Gabriel F Mendes.pdf: 1549891 bytes, checksum: 54640abf22622a7da0d29005cfc63db6 (MD5) license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) / Made available in DSpace on 2015-04-10T14:27:22Z (GMT). No. of bitstreams: 2 Tese Marcos Gabriel F Mendes.pdf: 1549891 bytes, checksum: 54640abf22622a7da0d29005cfc63db6 (MD5) license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Previous issue date: 2013 / PPGBV; FACEPE; CNPq; / Entender como a Diversidade Funcional (DF) de assembleias de organismos afeta a complexidade estrutural do habitat em paisagens fragmentadas é um passo fundamental para se avaliar o funcionamento adequado do ecossistema e qual valor de conservação desses ambientes modificados pelo homem. Utilizando a DF obtida através de um conjunto de oito atributos funcionais descritos para 1985 indivíduos da assembleia de árvores em 19 comunidades, comparamos dois modelos causais distintos entre a DF e quatro variáveis de complexidade estrutural (produção de serrapilheira, índice de área foliar, área basal e luz transmitida difusa) em dois tipos de habitats: (i) fragmentos florestais < 100 ha e (ii) áreas de floresta primária (controle). Os resultados mostram que a DF afeta estruturalmente o habitat, principalmente no que se refere à produção de serrapilheira e variação da área basal florestal, em grandes segmentos de floresta. Por outro lado, a relação entre DF e complexidade estrutural em fragmentos < 100 ha é inexistente, sugerindo que a estruturação do habitat dependa basicamente do estágio sucessional e pressões provenientes da matriz, as quais os fragmentos são submetidos. Este estudo reforça a importância da DF sobre a estruturação do habitat, mostrando que esta relação em pequenos fragmentos está sujeita à distorções resultantes dos efeitos da frequência relativa de determinadas estratégias de vida favorecidas pela modificação da paisagem e da maior sensibilidade desses habitats aos efeitos físicos provenientes da matriz.

Submitted by Leonardo Freitas (leonardo.hfreitas@ufpe.br) on 2015-04-10T17:22:05Z No. of bitstreams: 2 Tese Marcos Gabriel F Mendes 2013 (PPGBV_UFPE).pdf: 1549891 bytes, checksum: 54640abf22622a7da0d29005cfc63db6 (MD5) license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) / Made available in DSpace on 2015-04-10T17:22:05Z (GMT). No. of bitstreams: 2 Tese Marcos Gabriel F Mendes 2013 (PPGBV_UFPE).pdf: 1549891 bytes, checksum: 54640abf22622a7da0d29005cfc63db6 (MD5) license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Previous issue date: 2003 / PPGBV; CEPAN; FACEPE; CNPq / Entender como a Diversidade Funcional (DF) de assembleias de organismos afeta a complexidade estrutural do habitat em paisagens fragmentadas é um passo fundamental para se avaliar o funcionamento adequado do ecossistema e qual valor de conservação desses ambientes modificados pelo homem. Utilizando a DF obtida através de um conjunto de oito atributos funcionais descritos para 1985 indivíduos da assembleia de árvores em 19 comunidades, comparamos dois modelos causais distintos entre a DF e quatro variáveis de complexidade estrutural (produção de serrapilheira, índice de área foliar, área basal e luz transmitida difusa) em dois tipos de habitats: (i) fragmentos florestais < 100 ha e (ii) áreas de floresta primária (controle). Os resultados mostram que a DF afeta estruturalmente o habitat, principalmente no que se refere à produção de serrapilheira e variação da área basal florestal, em grandes segmentos de floresta. Por outro lado, a relação entre DF e complexidade estrutural em fragmentos < 100 ha é inexistente, sugerindo que a estruturação do habitat dependa basicamente do estágio sucessional e pressões provenientes da matriz, as quais os fragmentos são submetidos. Este estudo reforça a importância da DF sobre a estruturação do habitat, mostrando que esta relação em pequenos fragmentos está sujeita à distorções resultantes dos efeitos da frequência relativa de determinadas estratégias de vida favorecidas pela modificação da paisagem e da maior sensibilidade desses habitats aos efeitos físicos provenientes da matriz