Submitted by Bruno Caldeira Carlotti de Souza null (brunoccarlotti@gmail.com) on 2017-03-02T01:45:21Z No. of bitstreams: 1 Dissertação - Bruno C. C. de Souza.pdf: 1030573 bytes, checksum: e3dd1e43953565236359b6d10831067c (MD5) / Approved for entry into archive by LUIZA DE MENEZES ROMANETTO (luizamenezes@reitoria.unesp.br) on 2017-03-07T18:32:31Z (GMT) No. of bitstreams: 1 souza_bcc_me_sjrp.pdf: 1030573 bytes, checksum: e3dd1e43953565236359b6d10831067c (MD5) / Made available in DSpace on 2017-03-07T18:32:31Z (GMT). No. of bitstreams: 1 souza_bcc_me_sjrp.pdf: 1030573 bytes, checksum: e3dd1e43953565236359b6d10831067c (MD5) Previous issue date: 2017-02-23 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / O objetivo principal deste trabalho é apresentar detalhadamente um estudo sobre um critério, que aparece na referência Coincidence for maps of spaces with finite group action de D. L. Gonçalves, J. Jaworowski, P. L. Q. Pergher e A. Volovikov, para a existência de (H,G)-coincidências de aplicações cujo contradomínio é um CW-complexo finito Y de dimensão k e cujo domínio é um espaço X paracompacto, Hausdorff, conexo e localmente conexo por caminhos e munido de uma G-ação livre, de modo que exista um inteiro m tal que os grupos i-dimensionais de homologia de X sejam triviais nas dimensões 0<i<m e a cohomologia (m+1)-dimensional de G não seja trivial. Para a realização deste estudo foram necessários alguns resultados da teoria de cohomologia de grupos finitos, com ênfase em grupos de cohomologia periódica segundo a teoria de cohomologia de Tate, alguns resultados da teoria de fibrados e algumas noções da teoria de sequências espectrais cohomológicas. / The mais objective of this work is to present in detail a study about a criterion, which appears in the reference Coincidence for maps of spaces with finite group actions by D. L. Gonçalves, J. Jaworowski, P. L. Q. Pergher and A. Volovikov, for existence of (H,G)-coincidences of maps into a finite CW-complex Y with dimension k and whose domain is a paracompact, Hausdorff, connected and locally pathconnected space X with a free action of G, in a way that there exists an integer m such that the ith-homology group of X is trivial for 0<i<m and the (m+1)th-cohomology group of G is nontrivial. For the study of this criterion were needed some results of the theory of cohomology of finite groups, with emphasis on groups with periodic cohomology according to Tate cohomology theory, some results of the theory of fiber bundles and some notions of the theory of cohomological spectral sequences.

Este texto é resultado de um estudo detalhado da teoria topológica de raízes para aplicações de complexos CW 2-dimensionais em superfícies fechadas (compactas e sem bordo). Diversas abordagens dos problemas envolvidos nesta teoria são apresentadas, algumas inclusive bastante diferenciadas com respeito aos parâmetros da teoria clássica / This text is the result of a detailed study of the topological root theory for maps from 2-dimensional CW complex into closed surfaces (compact and without boundary surfaces). Several approaches to the problems involved in this theory are presented, some of which are quite different with respect to the parameters of the classical theory

Job Crafting – durch Beschäftigte initiierte Veränderungen des Jobs – hat in der Wissenschaft und Praxis in den letzten Jahren einen hohen Stellenwert eingenommen. Die Job Crafting Literatur hebt besonders die positive Seite des Job Craftings hervor – sowohl auf inter- als auch intraindividueller Ebene. Allerdings scheinen Job Crafting und seine Folgen komplexer zu sein und benötigen ein besseres Verständnis. Daher war das Ziel der Dissertation bisherige Job Crafting Theorien anhand von drei Ansätzen zu erweitern. Dafür habe ich vier Studien durchgeführt, aus denen drei Manuskripte hervorgingen. Erstens, in Studie 1 bezog ich mich auf die ressourcen-konsumierende Natur des Job Craftings und fand einen kurvilinearen Job Crafting-Effekt auf das Arbeitsengagement. Dies galt nur für erschöpfte Beschäftigte (d.h. Moderationseffekt). Zweitens, Studie 2 fokussierte sich auf den fluktuierenden Anteil des Job Craftings innerhalb von Beschäftigten (d.h. intraindividuelle Ebene) und untersuchte reziproke Beziehungen zwischen Job Crafting, Arbeitsengagement und Leistung von einer zur nächsten Woche. Daten aus einer wöchentlichen Tagebuchstudie wurden mit Hilfe eines Random-Intercept Cross-Lagged Panel Modells (RI-CLPM) analysiert. Es gab keine reziproken Beziehungen zwischen Job Crafting, Arbeitsengagement und Leistung auf intraindividueller Ebene zwischen den Wochen, die Beziehungen waren sehr heterogen. Drittens, in Studien 3 und 4 haben wir die Approach-Avoidance Job Crafting Skala basierend auf dem Approach-Avoidance Crafting Model entwickelt und validiert. Die Skala bildet Approach und Avoidance Crafting als unabhängige Faktoren ab und misst 8 verschiedene Dimensionen resultierend aus einer hierarchischen Struktur, die frühere Job Crafting Konzepte integriert. Unsere Ergebnisse zeigten inkrementelle Validität von Approach und Avoidance Crafting bei der Vorhersage von arbeitsbezogenen Outcomes. / Job crafting – employee-initiated changes to the job – has received a high priority in science and practice in the recent years. Job crafting literature often emphasizes its positive effects – both at the between-person and within-person level. However, job crafting and its consequences seem to be more complex and, thus needs further understanding. Doing so, the aim of the dissertation was to expand current job crafting theories by using three approaches. Therefore, I conducted four studies resulting in three manuscripts. Firstly, in Study 1, I referred to the resource-consuming nature of job crafting and found a curvilinear effect (U-shaped curve) of the job crafting strategy crafting social resources (i.e., increasing social resources) on work engagement. This only applied to exhausted employees (i.e., a moderation effect). Secondly, in Study 2 focused on the fluctuating portion of job crafting within employees and investigated reciprocal relationships between job crafting, work engagement, and performance from one week to the next at the within-person level. Data from a weekly diary study were analyzed with a random-intercept cross-lagged panel model (RI-CLPM). There were no reciprocal relationships between job crafting, work engagement, and performance at the within-person level across weeks, rather the relations were more heterogeneous than anticipated. Thirdly, in Study 3 and 4, we developed and validated the Approach-Avoidance Job Crafting Scale based on my approach-avoidance crafting model. The scale depicts approach and avoidance crafting as two independent factors and assesses eight different job crafting dimensions. These result from a hierarchical structure in which previous job crafting concepts are integrated. Our results showed that approach and avoidance crafting have incremental validity in predicting work-related outcomes beyond previous job crafting scales.

Betriebe werden immer vielfältiger. Diskussionen über dessen Vor- und Nachteile konzentrieren sich oft auf Leistungsaspekte, aber selten auf Gesundheit und Wohlbefinden. Da Arbeit das Wohlbefinden beeinflusst, betrachtet diese Dissertation in zwei Artikeln, wie Zusammenhänge zwischen sozialen Stressoren, sozialer Unterstützung und Wohlbefinden mit der Angehörigkeit zu einer ethnischen Minderheit und ethnischer Diversität in Arbeitsteams assoziiert sind. Um darüber hinaus Forschungsergebnisse anhand von Arbeit und Gesellschaft zu diskutieren, wurde das Arbeits-Gesellschafts-Widerspieglungsmodell entwickelt. Artikel 1 untersuchte, inwiefern sich Zusammenhänge zwischen Beschäftigten, die einer ethnischen Minderheit angehörten, und Beschäftigten, die der Mehrheit angehörten, unterschieden. In beiden Gruppen gab es einen negativen indirekten Zusammenhang zwischen verbaler Aggression durch Kund:innen und arbeitsbezogenem positivem Affekt über emotionale Dissonanz. Unerwarteterweise war bei Beschäftigten, die einer ethnischen Minderheit angehörten, die negative indirekte Beziehung zwischen verbaler Aggression durch Kund:innen und arbeitsbezogenem positivem Affekt dann besonders stark ausgeprägt, wenn ihre Vorgesetzten sie in hohem Maße unterstützten. Artikel 2 untersuchte, ob ethnische Diversität mit emotionalen Konflikten zusammenhängt und ob diese wiederum mit emotionaler Irritation korrelieren. Um Team- und Personenebene zu vergleichen, wurde ethnische Diversität auf beiden Ebenen in einem Mehrebenenmodell kombiniert. Die Ergebnisse wiesen auf einen Unterschied zwischen beiden Ebenen hin: Auf Teamebene gab es einen positiven Zusammenhang zwischen ethnischer Diversität und emotionaler Irritation, der durch emotionale Konflikte vermittelt wurde. Jedoch war dieser Zusammenhang auf Personenebene negativ, was die Komplexität ethnischer Diversität verdeutlicht. Abschließend diskutiere ich diese Forschungsergebnisse mithilfe des Arbeits-Gesellschafts-Widerspieglungsmodells. / Increased ethnic diversity in workplaces has fueled discussions on whether this diversity is an asset or a liability. These discussions often focused on performance but paid limited attention to well-being and health. As work represents an important determinant of well-being, this dissertation aimed to understand how associations between social stressors, social support, and well-being relate to ethnic minority status and ethnic diversity at work. Two papers addressed this aim. To discuss their research findings in the broader contexts of work and society, I introduced the work-society reflection model. Paper 1 examined ethnic minority status as a moderator in a multi-group path model. The analysis showed that the negative indirect association between customer verbal aggression and work-related positive affect via emotional dissonance did not vary between ethnic minority and ethnic majority workers. However, supervisor support moderated this indirect association only among ethnic minority workers. Unexpectedly, the negative indirect relationship between customer verbal aggression and work-related positive affect via emotional dissonance was stronger in ethnic minority workers with high levels of supervisor support. Paper 2 examined the association between ethnic diversity and emotional strain via emotional conflicts. To investigate whether this association varied between the team and individual levels, this paper combined ethnic diversity at both levels in a multilevel path model. In fact, the results indicated a difference between the team and individual levels: At the team level, ethnic diversity related positively to emotional strain via emotional conflicts. However, this association was negative at the individual level. This difference highlights the complexity of ethnic diversity. Finally, I integrated these research findings in the work-society reflection model to broaden the view on this topic and outlined implications for research and practice.

In this paper, the study of k-fold branched coverings for which the branch set is a stratified set is considered. First of all, the existence of universal k-fold branched coverings over CW-complexes with stratified branch set is proved using Brown's Representability Theorem. Next, an explicit construction of universal k-fold branched coverings over manifolds is given. Finally, some homotopy and homology groups are computed for some specific examples of Universal k-fold branched coverings.

Submitted by Cleide Dantas (cleidedantas@ufpa.br) on 2014-04-10T12:38:16Z No. of bitstreams: 2 license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) Dissertacao_EstudoViabilidadeOperacional.pdf: 3736724 bytes, checksum: a35ebe82f6137262328d3fe76f0595b0 (MD5) / Approved for entry into archive by Ana Rosa Silva (arosa@ufpa.br) on 2014-08-29T15:00:44Z (GMT) No. of bitstreams: 2 license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) Dissertacao_EstudoViabilidadeOperacional.pdf: 3736724 bytes, checksum: a35ebe82f6137262328d3fe76f0595b0 (MD5) / Made available in DSpace on 2014-08-29T15:00:44Z (GMT). No. of bitstreams: 2 license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) Dissertacao_EstudoViabilidadeOperacional.pdf: 3736724 bytes, checksum: a35ebe82f6137262328d3fe76f0595b0 (MD5) Previous issue date: 2007 / Este trabalho apresenta um estudo experimental da viabilidade operacional, econômica, geométrica e da qualidade da solda com o uso do processo intitulado MAG-CW (Metal Active Gas–Cold Wire); entendido como: processo de soldagem MAG com adição de arame frio ou não energizado. Neste contexto, para o desenvolvimento deste trabalho utilizou-se os processos de soldagem MAG e o MAG-CW, sendo utilizados arames consumíveis sólidos de 1,2 mm de diâmetro, da classe AWS E-70S6 e o dióxido de carbono puro, CO2, como gás de proteção com vazão de 17 l/min, para os dois processos empregados. A soldagem automatizada foi realizada com o auxílio de uma fonte eletrônica ajustada em CC+, no modo tensão constante e interfaceada a um microcomputador. Para ambos os processos, os cordões de solda foram depositados sobre corpos de prova de aço carbono SAE 1020 medindo 76x155x12,7 mm, com passes em simples deposição, na posição plana puxando e empurrando o arco voltaico. Para o processo MAG-CW adicionouse o arame frio, na região do arco elétrico, por um sistema de alimentação auxiliar de arame de forma seqüencial Tandem e Twin, também, na posição plana. As variáveis de influência foram a Velocidade de Alimentação do Arame-Eletrodo, VAE, que variou em três níveis: 6, 7,5 e 9 m/min, respectivamente, a Velocidade de Alimentação de Arame Frio, VAF, que também variou em três níveis, sendo: 3, 4 e 5 m/min combinadas com VAE. As variáveis de resposta para a avaliação experimental foram a estabilidade do arco elétrico, as características econômicas, as características geométricas e a qualidade superficial do cordão de solda. Os resultados mostraram satisfatória estabilidade do arco, bem como, elevada produção em relação ao processo MAG e bom aspecto superficial das soldas. Neste sentido, o processo MAG-CW, quando comparado ao processo MAG, foi superior na taxa de fusão (TF) em 57% para a VAE igual a 6 m/min, 59 % para VAE igual a 7,5 m/min e de 53 % para a VAE igual a 9 m/min. Observou-se, ainda, que o mesmo ocorreu para a taxa de deposição (TD) aumentando em todos os níveis de velocidade: 62% para a VAE na condição igual a 6 m/min e 7,5 m/min e de 57 % para a VAE na condição igual a 9 m/min. A boa performance no aumento das taxas obtidas pelo processo MAG-CW demonstra vantagem, com maior evidência no desempenho destas características, em função da adição de arame frio ao arco. / The present study shows experimental research of the weld concerning operational, economic and geometric viability as well as its superficial quality when using MAGCW (Metal Active Gas – Cold Wire), understood as: MAG welding process with nonenergized wire or cold wire. For the development of this research, welding MAG and MAG-CW processes have been used together with 1,2 mm of diameter consumable solid wires, class AWS E-70S6 and carbon dioxide pure, CO2, as protection gas with 17 l/min release for both processes. Automated welding was performed with electronic source adjusted in CC+, in constant tension mode, interfaced by a microcomputer. In both processes the welds were put on steel carbon samples SAE 1020, 76x155x12,7 mm size, with simple disposition passes, pulling and pushing the voltage arc. The MAG-CW process added cold wire on the electric arc region, fed by the Tandem and Twin sequential wire shape auxiliary system on plane position. The variables of influence were: Velocidade de Alimentação do Arame-Eletrodo, VAE, which varied in three levels: 6; 7,5 and 9 m/min, respectively, Velocidade de Alimentação do Arame-Fio, VAF, which also varied in three levels: 3; 4 and 5 m/min combined with VAE. Response variables for experimental evaluation were electric arc stability, economic features, geometric features and weld superficial quality. The results demonstrated satisfactory arc stability as well as high production concerning MAG process and also good superficial aspect of welds. Rising rates obtained by MAG-CW process demonstrates the superiority due to non-energized wire addition to the arc. Thus, the MAG-CW process, in comparison with MAG process, demonstrated superiority concerning the 57% in rate of fusion (RF) for the VAE of 6 m/min, 59 % for the VAE of 7,5 m/min and 53 % for the VAE in 9 m/min. it has also been observed that the same occurred with the rate of deposition (RD) increasing in all speed levels: 62% for the VAE in both conditions of 6 m/min and 7,5 m/min and in 57 % for the VAE in 9 m/min. The good performance in the increase of the taxes obtained by the process MAG-CW demonstrates advantage, with larger evidence in the acting of these characteristics, in function of the addition of cold wire to the arch.

Challenging behavior in preschool is a serious concern for teachers. In recent years, positive behavior support (PBS) has been shown to be effective in reducing such behaviors. Class-Wide Function-related Intervention Teams (CW-FIT) is a specific program for implementing PBS principles in classroom settings. CW-FIT is a group contingency that utilizes social skills training, teacher praise, and positive reinforcement to improve student behavior. Students are taught specific social skills and then work in teams to earn a group reward based on the use of these skills. CW-FIT has been shown to be effective in elementary classrooms but has not yet been evaluated with other age groups. The present study examined the effects of CW-FIT implementation on teacher praise rates and student engagement in four preschool classrooms with 55 total students. A single-subject, multiple-baseline design with embedded reversals was used to evaluate impact. Results indicate that CW-FIT increased teacher praise rates and student engagement while reducing student disruptive behavior. Both teachers and students found CW-FIT to be socially valid. The present study indicates promising results for the implementation of CW-FIT in a preschool setting.

Challenging and disruptive student behavior is a major concern for all teachers, including those who teach art. Unfortunately, there is a lack of research and resources available for art teachers to manage student behavior. School-wide positive behavior support (SWPBS) is a framework that has been shown to improve student behavior. Class-wide Function-Related Intervention Teams (CW-FIT) is an intervention that utilizes SWPBS principles including group contingency, social skills instruction, teacher praise, and positive reinforcement and has been shown to be effective in general education classrooms. This is the first study of CW-FIT in elementary art classrooms and examined the effects of the intervention on teacher praise-to-reprimand rates and student on-task behavior in three classrooms. The first classroom utilized an AB design while the other two used a reversal (ABAB) design to evaluate impact. The results indicated the teacher was able to implement CW-FIT with fidelity, increase praise-to-reprimand ratios, and increase group on-task behavior. Finally, both the teacher and students found it to be socially valid. Limitations and implications of this study for researchers and practitioners are discussed.

The ionization of chemicals in solids or liquids under ambient conditions, known as ambient ionization mass spectrometry, is currently a fruitful research area in mass spectrometry. To classify those ambient ionization techniques from preexisting atmospheric pressure ionization methods, the former are commonly defined as those mass spectrometric ionization methods that operate under ambient conditions and require minimal or no sample pretreatment. A characteristic of this technology is that sample introduction and ionization are usually separate events, thereby allowing independent control of each set of conditions. A two-step ESI-based technique, named electrospray laser desorption ionization (ELDI), has been developed to characterize nonvolatile analyte molecules directly from the surfaces of solid samples in 2005 by J. Shiea and his co-workers. The analyte molecules are produced by laser irradiating of the sample surfaces, and then post-ionized in an ESI plume. However, the pulsed laser used in ELDI-MS system is quite expensive. Our aim in this research is to develop simple, convenient, and cheap desorption methods and coupled them to post-ionization techniques for direct analysis of liquid and solid sample analysis. They includes: (a) the use of continuous wave (CW) laser instead of pulsed laser to desorb analytes in liquid samples and ointments, and (b) the use of thermal probe to desorb analytes in solid and liquid samples. All of the desorbed neutral species like molecules or droplets are then post-ionized via ESI or APCI processes. The first topic of the research is to develop a cheaper laser system to introduce analytes in solids or liquids into reaction region for post-ionization. In this section, we use a CW laser instead of a pulsed laser for the sampling of analytes. The titanium foil and stainless steel foil sample plate is quite useful and shows a great of desorption efficiency for liquid samples while irradiating by a CW laser. The detection limit by using a CW laser for sampling and ESI for post-ionization is 0.1 £gM for Benzethonium chloride and 1 £gM for cytochrome c, respectively. The combination of CW laser desorption and ESI post-ionization mass spectrometry can be applied in drug components, food safety and biomedical sample analysis. As a result of small size, lightness and lower prices of CW laser system, it not only shows large potential to use as a high efficiency desorption device for novel ionization source of mass spectrometer but also available for a wide range of useful application in many fields. The second topic of the research is to develop a new thermal probe for the direct desorption of sample surface. The home-made thermal probe is used to touch surface of solid sample or liquid sample to generate gas phase molecules or micro analyte droplets. Those neutral analytes are then post-ionized via ESI or APCI processes. In this study, the setting temperature of thermal probe is 250¢J. When the thermal probe touches liquid sample, it makes droplets boiling away explosively and then fused with ESI plume to generate ions. The detection limit by using a thermal probe for sampling and ESI or APCI for post-ionization is 1 £gM for both melamine and cytochrome c. This technique is also applied to analyze controversial additives in drinks. It also shows large potential to use as a high efficiency desorption device for novel ionization source of mass spectrometer and useful for a wide range of useful application in many fields.

Phase locking of external-cavity diodes laser¡]ECDL¡^ to the stabilized optical frequency combs of a femtosecond mode-locked laser. Optical frequency combs of a femtosecond mode-locked laser can be the reference standard of dual-wavelength external-cavity diode lasers (ECDLs). Frequency stabilization of two external-cavity diode laser is also demonstrated simultaneously.Suppression of the frequency fluctuation of two ECDLs from hundreds MHz to 200 Hz is demonstrated and characterized. Meanwhile, frequency tunable continuous-wave Tera-Hertz (cw THz) wave is generated and observed by photomixing of the output of two frequency stabilized ECDLS with tunable relative frequency difference on a photoconductive antennas. In our experiment, cw THz wave is demonstrated and with tuning range from 0.200 to 1.240THz and could be attribute as frequency standard of THz.