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1
Gonçalves, André da Motta. "Retificação de ultraprecisão de carbeto de tungstênio-cobalto (WC-Co)." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/18/18146/tde-26072016-100144/.
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Este trabalho apresenta o estudo da Retificação de Ultraprecisão de ligas de carbeto de tungstênio-cobalto (WC-Co) com diferentes microestruturas. A motivação para este estudo foi o grande potencial desta liga para a fabricação de componentes que requerem materiais de alta dureza e resistência à fratura. Devido à combinação dessas características, esses materiais vêm sendo usados na fabricação de moldes para injeção de lentes ópticas de dispositivos eletrônicos e ópticos. Assim, amostras de carbeto de tungstênio-cobalto foram submetidas a vários testes para determinação da correlação entre os parâmetros de corte e parâmetros estruturais (tamanho de grão e teor de cobalto) com o regime de remoção de material. As amostras foram polidas e posteriormente microendentadas com cargas variadas para pré-avaliar a ocorrência de formação de microtrincas. Testes de usinagem foram conduzidos em uma retificadora de ultraprecisão, usando rebolos de diamante e posteriormente a rugosidade e os danos da superfície (microtrincas e crateras) foram avaliados. Para melhor entendimento da influência dos parâmetros estruturais e dos parâmetros de corte sobre os resultados de rugosidade foi realizado um teste ANOVA. As forças de usinagem foram medidas durante os ensaios usando um microdinamômetro piezelétrico com objetivo de estimar a temperatura na zona de retificação. Os resultados obtidos indicam que tanto os parâmetros estruturais como os parâmetros de corte influenciam na rugosidade, microdureza e temperatura na zona de retificação das ligas de carbeto de tungstênio-cobalto. Amostras com maior tamanho de grãos apresentam as menores rugosidades e altas temperaturas na zona de retificação. A velocidade de avanço (Vf) mostrou-se mais influente que a profundidade de corte (ap). Menores velocidades de avanço aumentam a temperatura na zona de retificação e a microdureza na camada superficial. Entretanto, verificou-se que as maiores temperaturas obtidas nos ensaios não foram suficientes para promover alteração metalúrgica no material. Algumas condições de corte combinadas com parâmetros estruturais levam a remoção de material em regime dúctil, resultando em superfícies com qualidade óptica. A porcentagem de cobalto e a velocidade de avanço (Vf) têm forte influência na alteração da microdureza da camada superficial das amostras retificadas. A diminuição da velocidade de avanço tende a aumentar a microdureza na camada. Há aumento de microdureza de até 200 kgf/mm2, sugerindo a ocorrência de encruamento por tensões compressivas. Com base nestes resultados, acredita-se que a retificação de ultraprecisão apresenta-se como uma opção viável para a manufatura de componentes de carbeto de tungstênio com acabamento submicrométrico, possibilitando a eliminação dos processos tradicionais de manufatura óptica, tais como a lapidação e o polimento.The ultraprecision grinding of different tungsten carbide-cobalt microstructures (WC-Co) were investigated. The motivation for this study is the materials high hardness and potential application for micromolds. These materials have been used as optical inserts in glass injection molding processes for optical and electric devices, due to their excellent combination of high hardness, ductility and fracture toughness. Tungsten carbide samples were subjected to tests to determine the correlation between cutting parameters and microstructures to achieve the ductile regime of material removal. Polished surfaces of carbide samples were indented using varying loads to evaluate the microcracks formation. The machining tests were conducted using an ultraprecision grinding and A V-shaped metal-bond was used. Surface roughness was investigated as functions of the grinding conditions by means Analysis of Variance (ANOVA). The tangential force was measured using a piezoelectric dynamometer to estimate the grinding zone temperature. The results indicate that structural parameters (grain size and cobalt content) and cutting parameters have a significant influence on surface roughness, micro-hardness and grinding zone temperature for tungsten carbide-cobalt alloys.Tungsten carbide-cobalt samples with the larger grain size presented lower surface finish results and high grinding temperatures. The feed rate (Vf) showed greater influence that the in-feed (ap). The grinding zone temperature and the hardness are increased when speed rate is reduced. However, it was found that the highest temperature achieved did not reach a critical temperature for phase transformation. Some cutting parameters combined with structural parameters lead to ductile mode grinding mechanism, and as consequence, high optical quality surfaces are obtained. The micro-hardness of layer is extremely influenced by cobalt content and speed rate. Lower feed rate tends to increase the micro-hardness up to 200 kgf/mm2, suggesting that the compressive stress occurs. Considering the results presented it is believed that the Ultraprecision grinding showed to be a viable option for the fabrication of components made of tungsten carbide-cobalt with nanometer surface finish possibly eliminating traditional optical manufacturing processes such as lapping and polishing.
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Burns, Alfred M. "PARENTAL STRESS AS A CO-MORBIDITY OF SEVERE EARLY CHILDHOOD CARIES." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1241624634.
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Huyssteen, S. van. "Bedryfservaring in Kledingprogramme aan die Kaapse Technikon." Thesis, Cape Technikon, 1998. http://hdl.handle.net/20.500.11838/1927.
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Thesis (MTech(Education))--Cape Technikon, Cape Town,1998This study investigates the industry component of cooperative education programmes in Clothing as offered by the Clothing Department at the Cape Technikon relevant to the Western Cape. The character and nature of co-operative education came under general scrutiny. The structure of any cooperative educational program consists of two components; the academic and the industry component. Within this structure, a few attendance patterns are used to employ students in industry. This employment of students bridges the gap between the academic component and practice. The co-ordinator of co-operative education is responsible for the supervision over and application of specific tasks to ensure the successful completion of the industry component. The professional tasks include the identification and recruiting of workstations, the placement of students, the orientation of both the employer and student, the monitoring of the students' progress, as well as the evaluation of the students' work. The important role of the advisory committee cannot be underestimated in order to ensure successful completion of the co-operative educational programs. It should be properly constituted with specific functions with regards to the industry component. A qualitative study was undertaken to describe the course of the current industry experience in Clothing at the Cape Technikon. Discussion forums, personal interviews and a literature study serve as the foundation of this investigation.
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Dalidjan, Mulyani. "Caries inhibitory effect of fluoride co-crystallized sucrose : establishing a field trial /." Title page, contents and summary only, 1995. http://web4.library.adelaide.edu.au/theses/09PH/09phd143.pdf.
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Hasslöf, Pamela. "Probiotic Lactobacilli in the context of dental caries as a biofilm-mediated disease." Doctoral thesis, Umeå universitet, Institutionen för odontologi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-67843.
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Background: The World Health Organization defines probiotics as ‘live microorganisms which, when administered in adequate amounts, confer a health benefit to the host’. Traditionally, probiotic microorganisms have been used to prevent or treat gastrointestinal tract diseases. In the last 15 years, there has been increasing interest of a possible probiotic impact on the oral microbiota and dental caries. Dental caries is a multifactorial disease, and the causative factor in the oral microbiota includes a shift from a balanced microflora to a microflora that includes more aciduric species such as mutans streptococci (MS), non-mutans streptococci, and Actinomyces. MS is considered an opportunistic pathogen although several other bacteria also contribute to the disease. Early acquisition of MS is associated with early development of caries; therefore a desirable complement to other prophylactic measures would be a MS colonization inhibitor. Objective: To better understand how selected strains of probiotic lactobacilli interact with MS in vitro and in vivo and to study the impact of probiotic lactobacilli on caries development during childhood. Material and methods: The in vitro properties of probiotic lactobacilli were studied with regard to (i) acid production from sugars and sugar alcohols, (ii) growth inhibition capacity on clinical isolates and reference strains of MS as well as Candida albicans and (iii) the capacity to co-aggregate with MS. A randomized controlled trial (RCT) tested the short-term effect of intervention with two Lactobacillus reuteri strains on MS, which was evaluated after treatment with chlorhexidine. The re-growth patterns of MS and 19 other selected strains were also evaluated. In the second clinical study we investigated the long-term effect on MS prevalence and dental caries after an intervention with Lactobacillus paracasei ssp. paracasei F19 (LF19) between 4 and 13 months of age. Results: The results from the in vitro testing showed that strains of probiotic lactobacilli differed in their fermentation patterns, inhibition capacity and their capacity to co-aggregate, which should be kept in mind in the translation to clinical research. The clinical study on short-term effects of two L. reuteri strains on MS and other oral strains showed no effect on re-growth patterns after intervention. The clinical study on long-term effects of LF19 showed no effect on the prevalence of MS. Furthermore, the clinical follow-up at 9 years of age showed no differences in either decayed, missing, and filled surface (dmfs) or DMFS between the probiotic and placebo groups. Evaluation of saliva samples showed no signs of oral colonization with LF19 in the study group. Conclusion: The in vitro testing showed potentials of the selected probiotic Lactobacillus strains for interference with MS and C. albicans. The results from the clinical studies showed no such effect on MS or dental caries. Evidence regarding the effectiveness of specific probiotic applications in the prevention of dental caries is limited and does not allow for conclusions concerning the use of probiotic bacteria as a preventive measure.
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Thorne, Trina S. "The effect of co-operative education on career decision making of secondary students in Newfoundland." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0017/MQ54912.pdf.
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Young, Glenda. "Preparing Students for Professional Work Environments Through University- Industry Partnerships: A Single Case Study of the Co-op Development Program." Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/85414.
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Persistent calls to the field of engineering education to help develop diverse, well-prepared engineers for the STEM workforce have fostered collaborations across university and industry stakeholders. As stakeholders focus efforts on supporting student persistence at several critical junctures, there has been a renewed interest in supporting the school-to-workforce transition for engineering graduates. With calls to develop a more tech-savvy workforce, innovative approaches to supporting and preparing students to enter the workforce have become even more necessary; thus it is important to understand how university- industry partnerships generate experiences that contribute to students' eventual workforce entry.
The structure of the Co-op Development Program and the perspective of eight former CDP participants addressed how learning experiences shaped the career decisions of engineering participants immediately following graduation. A qualitative single case study approach was used and Social Cognitive Career Theory (SCCT) guided the study. Major contributions of this study include extending the analytic generalizability of Social Cognitive Career Theory, creating operationalized definitions of learning experiences embedded within that framework, and linking those experiences to how students' beliefs were shaped on their pathway to an early career within engineering industry. The themes identified in this study can help CDP managers and university stakeholders better support co-op participants and potentially allocate resources that
will serve as the basis for future co-op design recommendations.
Stakeholders may also use findings to promote the role of university and industry partnerships in supporting the student workforce transition. Future researchers may extend the study design across multiple cases and leverage recommendations for qualitative and quantitative investigations to address some of the limitations embedded within this research design and further contribute to the discussion of preparing students for professional work environments through university-industry partnerships. Ultimately, findings of this study give voice to the student partner in university-industry partnerships as themes identified in this study help CDP managers and university stakeholders to establish interventions and serve as the basis for future co-op design recommendations.Ph. D.
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Kwong, Koon-lau. "An examination of training practices and its impact on employees's career in Haeco over twenty years /." [Hong Kong : University of Hong Kong], 1985. http://sunzi.lib.hku.hk/hkuto/record.jsp?B12315138.
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Bajunaid, Mohammed Mohammed. "The effectiveness of co-operative education programmes for developing students' awareness of the importance of generic competencies." Connect to e-thesis, 2008. http://theses.gla.ac.uk/489/.
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Thesis (Ph.D.) - University of Glasgow, 2008.Ph.D. thesis submitted to the Faculty of Education, Centre for the Support for Learning, University of Glasgow, 2008. Includes bibliographical references. Print version also available.
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Lawrence, Nelson T. "Career track outcomes for cooperative education students at Kaukauna High School six year follow-up of career choices of mainstream and EEN students enrolled in Technology Education CO-OP Program /." Online version, 1999. http://www.uwstout.edu/lib/thesis/1999/1999lawrencen.pdf.
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Ara?jo, Camila Pacelly Brand?o de. "Obten??o de Mo2C com adi??o de Co por rea??o g?s-s?lido em reator de leito fixo." Universidade Federal do Rio Grande do Norte, 2015. http://repositorio.ufrn.br/handle/123456789/19690.
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Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico - CNPq
As emiss?es de compostos sulfurados pela ind?stria do refino de petr?leo v?m sendo sujeitas a legisla??es cada vez mais restritivas devido aos impactos ambientais e na sa?de humana. A remo??o de compostos de enxofre pode ocorrer atrav?s de rea??es de hidrotratamento (HDT) as quais s?o catalisadas por s?lidos, geralmente ?xidos ou sulfetos met?licos normalmente suportados em alumina. Para a remo??o de enxofre (HDS) catalisadores de Co(Ni)-Mo(W)/Al2O3 s?o os mais utilizados, por?m novos materiais vem sendo desenvolvidos para esse fim. Carbetos de metais refrat?rios foram identificados como potenciais candidatos para essa aplica??o, a dopagem destes pode ser uma alternativa para a cat?lise dessa rea??o. Os precursores para obten??o de Mo2C foram heptamolibdato de molibd?nio [(NH4)6[Mo7O24].4H2O] e nitrato de cobalto [Co(NO3)2.6H2O] e foram cominu?dos manualmente em propor??es estequiom?tricas anteriormente ? rea??o. Os precursores foram caracterizados por TG/DTA, MEV, FRX e DRX. Os carbetos de molibd?nio com adi??o de cobalto foram obtidos atrav?s de rea??o g?s-s?lido com atmosfera de metano (CH4) e hidrog?nio (H2) utilizando reator de leito fixo. Foi utilizada vaz?o total da mistura gasosa de 15L/h com 5% de CH4 e taxa de aquecimento de 5?C/min at? a temperatura de rea??o (700 ou 750?C). Dois percentuais de cobalto foram empregados: 2,5 e 5%. Foi notada a presen?a de fase CoMoO4 e MoO3 nos percursores calcinados, o que indica o ?ntimo contato entre os metais. Para os produtos da rea??o de carboneta??o a 700?C, independentemente do teor de cobalto adicionado, foi formado Mo2C-ortorr?mbica e MoO2- monocl?nica. A 750?C somente Mo2C foi detectada por DRX. N?o foi poss?vel a identifica??o de fase contendo Co pelos difratogramas em nenhuma das condi??es. Nessa temperatura, a an?lise de TOC indicou a completa convers?o dos ?xidos a carbeto, com forma??o de 8,9% de carbono livre para a amostra com 2,5% de Co, para a amostra com 5% a convers?o foi incompleta (86%). Os produtos de rea??o foram caracterizados por FRX, DRX, MEV, TOC, BET e granulometria a laser
Sulfur compounds emissions have been, on the late years, subject to more severe environmental laws due to its impact on the environment (causing the acid rain phenomena) and on human health. It has also been object of much attention from the refiners worldwide due to its relationship with equipment?s life, which is decreased by corrosion, and also with products? quality, as the later may have its color, smell and stability altered by the presence of such compounds. Sulfur removal can be carried out by hydrotreating (HDT) which is a catalytic process. Catalysts for HDS are traditionally based on Co(Ni)-Mo(W)/Al2O3. However, in face of the increased contaminants? content on crude oil, and stricter legislation on emissions, the development of new, more active and efficient catalysts is pressing. Carbides of refractory material have been identified as potential materials for this use. The addition of a second metal to carbides may enhance catalytic activities by increasing the density of active sites. In the present thesis Mo2C with Co addition was produced in a fixed bed reactor via gas-solid reaction of CH4 (5%) and H2(95%) with a precursor made of a mix of ammonium heptamolybdate [(NH4)6[Mo7O24].4H2O] and cobalt nitrate[Co(NO3)2.6H2O] at stoichiometric amounts. Precursors? where analyzed by XRF, XRD, SEM and TG/DTA. Carboreduction reactions were carried out at 700 and 750?C with two cobalt compositions (2,5 and 5%). Reaction?s products were characterized by XRF, XRD, SEM, TOC, BET and laser granulometry. It was possible to obtain Mo2C with 2,5 and 5% cobalt addition as a single phase at 750?C with nanoscale crystallite sizes. At 700?C, however, both MoO2 and Mo2C phases were found by XRD. No Co containing phases were found by XRD. XRF, however, confirmed the intended Co content added. SEM images confirmed XRD data. The increase on Co content promoted a more severe agglomeration of the produced powder. The same effect was noted when the reaction temperature was increased. The powder synthesized at 750?C with 2,5% Co addition TOC analysis indicated the complete conversion from oxide material to carbide, with a 8,9% free carbon production. The powder produced at this temperature with 5% Co addition was only partially converted (86%)
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Azevedo, Heytor Vitor Souza Bezerra de. "Efeito da adi??o de WC e Co na sinteriza??o e propriedades mec?nicas da alumina." Universidade Federal do Rio Grande do Norte, 2016. http://repositorio.ufrn.br/handle/123456789/21026.
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Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES)
Comp?sitos ? base de alumina (Al2O3), carbeto de tungst?nio (WC) e cobalto (Co) apresentam propriedades espec?ficas como baixa densidade, alta resist?ncia ? oxida??o, alto ponto de fus?o e elevada in?rcia qu?mica. Esse comp?sito revela ser um material promissor para ser aplicado em diversos campos da engenharia. Este trabalho tem como objetivo avaliar algumas propriedades mec?nicas durante a confec??o e, ap?s a sinteriza??o do comp?sito (Al2O3 - WC - Co). P?s comp?sitos com a composi??o de 80%.p de Al2O3, 18%.p de WC e 2%.p de Co foram processados pela rota de moagem de alta energia (MAE), em moinho planet?rio por 50 horas, bem como por mistura manual em um recipiente de vidro, seguindo a mesma propor??o em peso. Amostras foram coletadas (2, 10, 20, 30, 40 e 50 horas) durante o processo de moagem. Em seguida, os p?s foram prensados no formato de amostra circular com di?metro de 5 mm em uma prensa uniaxial com press?es de 200 e 400 MPa. A sinteriza??o ocorreu de duas maneiras: a primeira sinteriza??o via fase s?lida foi realizada ? 1300 ?C e ? 1126 ?C durante 1h com taxa de aquecimento de 10?C/min em forno resistivo sob atmosfera de arg?nio as press?es de compacta??o utilizadas foram de 200 e 400 MPa, a segunda sinteriza??o foi realizada em dilat?metro via fase s?lida ? 1300 ?C com press?o de compacta??o de 200 MPa, tamb?m foi realizada em dilat?metro outra sinteriza??o, desta vez por fase l?quida ? 1550 ?C com press?es de compacta??o de 200 e 400 MPa, obedecendo os mesmos par?metros utilizados no forno resistivo. As mat?rias-primas foram caracterizadas por difra??o de raios X - (DRX), fluoresc?ncia de raios X - (FRX), microscopia eletr?nica de varredura (MEV), espectroscopia por dispers?o de energia (EDS) e particulometria a laser. As amostras sinterizadas foram submetidas a ensaios de microdureza. Os resultados mostraram que a moagem de alta energia atingiu os objetivos quanto ao tamanho de part?cula e a densifica??o do comp?sito. Entretanto, a microdureza n?o alcan?ou resultados significativos, isso ? um ind?cio que o comp?sito possui baixa tenacidade ? fratura.
Composites based on alumina (Al2O3), tungsten carbide (WC) and cobalt (Co) exhibit specific properties such as low density, high oxidation resistance, high melting point and high chemical inertia. That composite shows to be a promising material for application in various fields of engineering. In this work, the mechanical properties of the composite (Al2O3 ? WC ? Co), particularly density and hardness, were evaluated according to the effects of the variables of powder processing parameters, green compact and sintered. Powder composites with the composition of 80 wt% Al2O3, 18 wt% WC and 2 wt% Co were processed by high energy ball milling in a planetary mill for 50 hours as well as mixed by manual mixing in a glass vessel with the same proportion. Samples were collected (2, 10, 20, 30, 40 and 50 hours) during the milling process. Then, the powders were compacted in a cylindrical die with 5 mm in diameter in a uniaxial press with pressures of 200 and 400 MPa. The sintering was in two stages: first, the solid phase sintering was performed at 1126 and 1300 ?C for 1 hour with a heating rate of 10 ?C/min in a resistive furnace under argon atmosphere for green samples compacted in 200 and 400 MPa; the second sintering was performed on dilatometer in solid phase at 1300 ?C for green sample compacted in 200 MPa, another sintering also was performed on dilatometer, this time in liquid phase at 1550 ?C for green samples compacted in 200 and 400 MPa, with the same parameters used in resistive furnace. The raw materials were characterized by X ? ray diffraction (XRD), X ? ray fluorescence (XRF), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and laser particlemeter. The sintered samples were subjected to microhardness testing. The results showed that high energy milling achieved to the objectives regarding the particle size and the dispersion of composite phases. However, the hardness did not achieve to significant results, this is an indication that the composite has low fracture toughness.
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Simmons, Jamie Munn. "Characteristics of Exemplary Science, Technology, Engineering, and Math (STEM)-Related Experiential Learning Opportunities." Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/77527.
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Experiential opportunities at the secondary level give students the 'intimate and necessary relation between the processes of actual experience and education' (Dewey, 1938, p. 19-20). Career and Technical Education classes (CTE) and co-curricular experiences, one type of experiential learning, underpin and cultivate student curiosity and often channel interests into STEM-related post-secondary disciplines and career choices. There is little existent research on the characteristics of exemplary experiential learning opportunities and the impact on stakeholders. This study is intended to identify the qualities and characteristics of an exemplary secondary experience through the lived experiences of the stakeholders; students, STEM-related teachers, and CTE/STEM Administrators.
A qualitative research design was used to examine characteristics and implications for students of four STEM-related programs throughout Virginia. Conclusions from the study include fundamental principles for providing exemplary experiential STEM-related learning opportunities. These principles include: providing hands-on, real world learning opportunities for students, providing learning opportunities that will enhance student ownership in their learning, providing unique and comprehensive career exploration opportunities for students, providing a schedule for teachers that will give them time to plan, deliver, and manage exemplary experiential learning opportunities, providing continual teacher and administrator in-service training relative to planning and implementing exemplary experiential learning opportunities, investing appropriate funds for providing exemplary experiential learning opportunities. Establishing and maintaining active partnerships with business/industry and colleges/universities, and maintaining active advisory communities, providing appropriate staff to support the provision of exemplary experiential learning opportunities is needed. The need for adequate funding, improving perception of CTE and STEM programs, and small class sizes was also recommended.Ph. D.
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Schalk, Jaclyn. "The Academic and Co-Curricular Factors That Predict Full-Time Job Placement and Starting Salary Upon Graduation for College of Business Students." Bowling Green State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1371221438.
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Tertuliano, Ruan S?vio da Costa. "S?ntese, carateriza??o e avalia??o cin?tica da obten??o de WC-Co atrav?s de rea??o g?s - s?lido." PROGRAMA DE P?S-GRADUA??O EM ENGENHARIA QU?MICA, 2017. https://repositorio.ufrn.br/jspui/handle/123456789/23396.
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Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES)
A busca por materiais de alto valor agregado, alta aplicabilidade e elevada sustentabilidade motiva inova??es em todas as ?reas da engenharia. Um dos materiais desenvolvidos atualmente com tais requisitos s?o os carbetos dopados, que s?o compostos de cer?mica e metais. Este trabalho prop?e a s?ntese, caracteriza??o e avalia??o cin?tica do carbeto de tungst?nio dopado com cobalto (WC-Co). As etapas de produ??o do material s?o: s?ntese do precursor por via ?mida mediante agita??o em etanol de uma mistura de paratungstato de am?nio e nitrato de cobalto, secagem da lama obtida em mufla por 18h a 80?C, maceragem do p? seco, caracteriza??o preliminar usando as t?cnicas de MEV, DRX e EDS, rea??o g?s-s?lido de carborredu??o a 750, 800 e 850?C em atmosfera com 5% de metano e 95% hidrog?nio em reator de leito fixo e leito rotativo (agita??o de 34 rpm) e caracteriza??o final usando as t?cnicas j? citadas. Os resultados obtidos mostram um material contendo part?culas de carbeto de tungst?nio com o cobalto aderido de boa ?rea interfacial e aplic?vel a ?reas como: em catalisadores, reatores ? membrana e c?lulas combust?veis, o que ressalta a import?ncia desse tipo de pesquisa.
The search for high value-added materials, wide applicability and high sustainability encourages innovation in all areas of engineering. One of the materials currently being developed with such requirements are the doped carbides, which are composed with a mix of ceramics and metals. This work proposes the synthesis, characterization, kinetic evaluation and of tungsten carbide doped with cobalt (WC-Co) in fix and rotating bed reactor. The steps of material production was: synthesis of the precursor of washed by stirring in ethanol of a mixture of ammonium paratungstate and cobalt nitrate, drying th/e slurry obtained in oven for 18h at 80 ?C, the dry powder milling, preliminary characterization by SEM techniques, XRD and SDS, gas-solid reaction of reduction at 750, 800 and 850 ? C in an atmosphere of 5% methane and 95% hydrogen in fix bed and rotating bed reactor (at 34 rpm agitation) and the final characterization using the aforementioned techniques. The results show a material containing particles of tungsten carbide with cobalt adhered, with good interfacial and applicable in areas such as in catalysts, membrane reactors and fuel cells, which emphasizes the importance of such research.
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Emery, Crystal. "The Effect of Joint Training on Knowledge and Attitudes of Career and Technical Education and Special Education Professionals." DigitalCommons@USU, 2019. https://digitalcommons.usu.edu/etd/7590.
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Career and technical education (CTE) is a set of career-focused courses and pathways that provide students with technical skills and knowledge which can lead to future employment and postsecondary education. Concentration in a career and technical education pathway while still in high school supports job exploration for school-age youth and is correlated with higher levels of full-time employment after high school. This is especially true for students with disabilities. Special Education (SPED) is the educational support system for students with disabilities. CTE and SPED professionals have struggled to effectively collaborate to serve students with disabilities. Infrequent and inconsistent communication between CTE and SPED professionals as well as limited time and opportunities are barriers to effective collaboration between these professional groups. Joint training with SPED and CTE teachers may be a crucial component to a successful collaboration process.
The purpose of this research is to explore the effect of joint training and collaborative teaming with CTE and SPED professionals on their knowledge and attitudes of collaboration in serving students with disabilities. The activities in this research study involved educating SPED and CTE professionals in a joint training on working together to effectively serve students with disabilities. Time for collaborative teaming and strategizing between SPED and CTE professionals was included in the training. Knowledge and attitudes were measured before and after the training. This study demonstrated that joint training and collaborative teaming with CTE and SPED professionals increased knowledge of both disciplines and improved attitudes about collaboration between disciplines. Improved knowledge and attitudes toward collaboration resulted from professionals creating a sense of network and community as they worked in interdisciplinary teams.
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Pecharki, Giovana Daniela. "Análise multinível de fatores sociais e biológicos associados à cárie dentária =Multilevel modelling of social and biological factors in dental caries / Giovana Daniela Pecharki ; orientadora, Paula Cristina Trevilatto ; co-orientador, Samuel Jorge Moyses." reponame:Biblioteca Digital de Teses e Dissertações da PUC_PR, 2009. http://www.biblioteca.pucpr.br/tede/tde_busca/arquivo.php?codArquivo=1475.
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Tese (doutorado) - Pontifícia Universidade Católica do Paraná, Curitiba, 2009Inclui bibliografias
A cárie dentária é uma doença complexa que apresenta natureza multifatorial. Assim, uma abordagem considerando fatores que podem influenciar a doença em diferentes níveis e a sua integração parece ser desejável. A Análise Multinível (AM) é um modelo que c
Dental caries is a complex disease which has a multifactorial nature. Thus, an approach, considering factors that may influence disease at different levels and their integration, is desirable. Multilevel Modelling (MM) is a clustered analysis that conside
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Blackwell, Rebecca. "Improving the experiences of palliative care for older people, their carers and staff in the Emergency Department using experience-based co-design." Thesis, King's College London (University of London), 2015. https://kclpure.kcl.ac.uk/portal/en/theses/improving-the-experiences-of-palliative-care-for-older-people-their-carers-and-staff-in-the-emergency-department-using-experiencebased-codesign(9de694f8-899e-4387-9680-02a7f0da8b8c).html.
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Background: The Emergency Department (ED) is often viewed as an inappropriate environment for terminally ill older patients; however, palliative admissions to the ED continue to occur. Despite an increased focus on end of life and palliative care services, the role of the ED has generally been neglected in the UK. Aim and Methodology: This study used the participatory action research methodology, Experience-based Co-design to identify concerns and solutions to improve experiences of palliative care provision in the ED for older patients (65+), their carers and staff at Guy’s and St Thomas’ Hospital NHS Foundation Trust ED. Methods: Experiential narrative data were gathered using audio and filmed interviews, and analysed using a thematic framework to identify the main challenges. Findings were validated by the staff and patient/carer groups, who selected four improvements priorities (IP) each (eight in total). Findings, in the format of a patient/carer film and a staff presentation were shared at a co-design event which enabled participants to collaboratively select shared IPs and began to redesign applicable elements of the service. The study was enhanced by findings from a data collection field trip to a geriatric-only ED at Mount Sinai Hospital in New York. Using interviews and observation additional background contextual data on palliative care coding and ED impact on the patient journey were identified. Findings: The four staff IPs were: ‘helping them [patients and carers] find their way’, ‘being informed and informing them [patients and carers]’, ‘seeing the person in the patient’, and ‘expectations of the care we can give’. Patient and carer IPs were similar: ‘finding our way’, ‘knowing what’s happening’, ‘seeing the person in the patient’, and ‘expectations of care’. The co-design event explored these issues and the group began to develop plans to improve them. Immediate strategies aimed to: improve self-management and ownership, develop ED-based palliative care pathways and staff training, create dedicated palliative care space in the ED, improve IT and databases, improve patient experience, and share the learning of the study. Impact: Early study impact includes palliative care referral improvements, introducing routine ED visits by the palliative care team, development on palliative care pathway processes in the ED, development of mandatory palliative care training in the ED which includes the patient/carer film. Based on feedback from the co-design event, the film was expanded to include the staff experience as well.
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Laruelle, Sophie. "Analyse d'Algorithmes Stochastiques Appliqués à la Finance." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2011. http://tel.archives-ouvertes.fr/tel-00652128.
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Cette thèse porte sur l'analyse d'algorithmes stochastiques et leur application en Finance notamment et est composée de deux parties. Dans la première partie, nous présentons un résultat de convergence pour des algorithmes stochastiques où les innovations vérifient une hypothèse de moyennisation avec une certaine vitesse. Nous l'appliquons ensuite à différents types d'innovations (suites i.i.d., suites à discrépance faible, chaînes de Markov homogènes, fonctionnelles de processus \alpha-mélangeant) et nous l'illustrons à l'aide d'exemples motivés principalement par la Finance. Nous établissons ensuite un résultat de vitesse ''universelle'' de convergence dans le cadre d'innovations équiréparties dans [0,1]^q et nous confrontons nos résultats à ceux obtenus dans le cadre i.i.d.. La seconde partie est consacrée aux applications. Nous présentons d'abord un problème d'allocation optimale appliqué au cas d'un nouveau type de place de trading: les {\em dark pools}. Ces places proposent un prix d'achat (ou de vente) certain, mais n'assurent pas le volume délivré. Le but est alors d'exécuter le maximum de la quantité souhaitée sur ces places. Ceci mène à la construction d'un algorithme stochastique sous contraintes à l'aide du Lagrangien que nous étudions dans les cadres d'innovations i.i.d. et moyennisantes. Le chapitre suivant présente un algorithme d'optimisation pour trouver la meilleure distance de placement d'ordres limites: il s'agit de minimiser le coût d'exécution d'une quantité donnée. Ceci mène à la construction d'un algorithme stochastique sous contraintes avec projection. Pour assurer l'existence et l'unicité de l'équilibre, des critères suffisants sur certains paramètres du modèle sont obtenus à l'aide d'un principe de monotonie opposée pour les diffusions unidimensionnelles. Le chapitre suivant porte sur l'implicitation et la calibration de paramètres dans des modèles financiers. La première technique mène à un algorithme de recherche de zéro et la seconde à une méthode de gradient stochastique. Nous illustrons ces deux techniques par des exemples d'applications sur 3 modèles: le modèle de Black-Scholes, le modèle de Merton et le modèle pseudo-CEV. Enfin le dernier chapitre porte sur l'application des algorithmes stochastiques dans le cadre de modèles d'urnes aléatoires utilisés en essais cliniques. A l'aide des méthodes de l'EDO et de l'EDS, nous retrouvons les résultats de consistance (convergence p.s.) et de normalité asymptotique (TCL) de Bai et Hu mais sous des hypothèses plus faibles sur les matrices génératrices. Nous étudions aussi un modèle ''multi-bras'' pour lequel nous retrouvons le résultat de convergence p.s. et nous montrons un nouveau résultat de normalité asymptotique par simple application du TCL pour les algorithmes stochastiques.
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Dalidjan, Mulyani. "Caries inhibitory effect of fluoride co-crystallized sucrose : establishing a field trial." 1996. http://web4.library.adelaide.edu.au/theses/09PH/09phd143.pdf.
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Bibliography: leaves [165]-178. Designs and implements a field trial to test the effectiveness of a 10 ppm fluoride co-crystallized sugar in inhibiting caries as a potentially inexpensive public health preventative measure.
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Tien, Shu-Lan, and 田淑蘭. "Workers'' Career Strategy in Privatization - A Case Study of Taiwan Transportation Co." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/63433858392966511478.
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Thorne, Trina S. "The effect of co-operative education on career decision making of secondary students in Newfoundland /." 1997.
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Liu, Fan-Chia, and 劉凡嘉. "A study on Relationships among Gender Role, Co-dependency, and Career Maturity of High School Students." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/18946051682723166210.
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碩士淡江大學
教育心理與諮商研究所碩士班
102
The purpose of this study was to investigate the relations between gender role, co-dependency and career maturity in high school students. Questionnaire survey method was used to collect data from 852 public high school students in Taipei. Four research instruments were used in this study, including personal background information, gender role scale, co-dependency scale and career maturity scale. The major findings were as follows: 1.Both in male and female, the “undifferentiated” had the highest percentage, followed by “androgynous”. 2.Female high school students had higher “identified caretaking activities” than male students. “Masculine” and “feminine” had no significant difference in all aspect of “career maturity”. 3.Female high school students had higher “career development of cognitive” than male students. The third-year students had higher “career development of cognitive” than the first-year students, and had higher “career planning attitude” than first/second-year students. 4.In whole career maturity, including “career development of cognitive” and “career planning attitude”, “androgynous” had the highest impact, and “masculine” and “feminine” are both higher than “undifferentiated”. 5.The “identified caretaking activities” can both effectively predict “career development of cognitive” and “career planning attitude”, and “attempts to derive a sense of purpose through relationships” can also predict “career planning attitude”. 6.The “gender role” can both effectively predict “career development of cognitive” and “career planning attitude”, and “androgynous” had the highest predictive power. Based on the research results, further suggestions and discussions were made and future recommendations were also proposed.
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Tsai, Chang Ying, and 蔡長穎. "Industry Global competitive arrangement and management research －A Case Study of Career Tech(FOG) Co.,LTD." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/77887948203771572576.
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碩士元智大學
管理研究所
94
This thesis uses value flexible printed circuits business analysis and Global competitive arrangement and management research. Using a case study methodology, the author investigates of flexible printed circuits industry. Career Tech as the central to research the industry global competitive arrangement and management research . The study analyzes each company their global competitive arrangement, evaluates their management result, contrasts the differences of those companies off models, and suggests that Career Tech adopt actively to developing their global competitive arrangement. . The research finding contributes to the understanding of the value activity spin off issue in flexible printed circuits industry.
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Harris, Brenda Helen. "An enquiry into the value of work experience as part of a career education programme for grade 11 pupils in a co-educational high school." Thesis, 1997. http://hdl.handle.net/10413/5870.
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This study focused on the responses of the main role players in a Work
Experience Programme which is offered as a component of Grade 11 Career Education at Hillcrest High School. The aim was to describe, evaluate and optimise the programme. The theory and literature on career development and work experience was reviewed in order to establish what programmes, methods and approaches are currently being used internationally and in South Africa. Issues related to work experience were explored with a view to evaluate whether the programme undertaken could enhance the career decision making of Grade 11 pupils.
A qualitative, participatory research method was applied. The action research design chosen enabled the researcher to collect data over a period of eight months while interacting 'with her subjects as their teacher counsellor. The design, application, analysis of findings and limitations of the research study are described and recorded.
The findings indicated that the programme was regarded as a positive experience by the majority of pupils. It was possible to make recommendations from the findings for wider application of such a programme.Thesis (M.Ed.)-University of Natal, Pietermaritzburg, 1997.
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Van, der Walt Sophie. "Generational awareness in co-worker relationships in the interactive information society." Thesis, 2011. http://hdl.handle.net/10210/3807.
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M.Phil.Although a great deal of research has been conducted on diversity management in South Africa, very little of this research has focused on age diversity within interactive information societies such as libraries in South Africa. This study will focus specifically on academic libraries. It is also clear that most of the research regarding age diversity within Academic Information Services (AIS) has focused on managing the difference in ages between library patrons and library staff members. Very little of the research is devoted to age diversity between co-workers, and even less research has been conducted regarding Cuspers as a generational cohort within the library environment. This study is aimed at investigating age diversity within AIS in South Africa in relation to its effect on work, work performance and co-worker relationships. It is also aimed at encouraging organisations, and specifically AIS, to take cognisance of the current age demographic of their libraries and to develop and implement not only succession planning policies, but also relevant recruitment and retention policies in order to avoid employee and leadership vacuums. The research findings of this study are relevant as they give organisations in general, and specifically AIS within higher education institutions (HEI), a point of reference to guide the formulation of recruitment and employment policies that would appeal to the values and preferences of younger generational cohorts currently under-represented in these organisations. In addition, this study is of value with regard to the formulation of succession policies focused on the planning and training of new middle and top management staff members in order to improve current succession policies and plans.
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Lin, Wu Yi, and 吳一麟. "The Co-relation Analysis of Police Personnel Training System and Career Development of the Basic Unit Policeman of Taiwan." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/76399770789056128029.
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碩士大葉大學
人力資源暨公共關係學系碩士在職專班
94
ABSTRACT In any modern country, police's organ is an indispensable ring in national administrative organ in fact, and the person who carries out this role's function, need to hang on all police personnel and join hands in order to attend, so the police personnel are the most important human resources in police's organ . In public affair careers of police, how to use and develop this human resources effectively, in order to excite the latent energy of manpower and finish organ's mission, the system has a key factor in fact in ' career development ', so, this text regards probing into a policeman and educating and shunting the influence of alert career development to the basic unit person of the system as the main subject, the researcher has not found yet at present , black suffused with the theorying , have promotion which focuses on the high-order post personnel in China, alert to the basic unit in police's organ person, police junior college graduate and test alert duty personnel of class appoint state and actual distributary system of operation it studies to be still rare genus specially especially, have value of studying deeply. The task that the police personnel take charge of is different from general government functionary, its work has loyal, professional, painstaking, mobility and luring , so there must be most rational , soundest policeman's personnel systems , can enhance troop morale and absorb outstanding talents to join police's camp . So-called: ' people is it lift to make at the same time, origin of an incident law piece ', policeman formulation , personnel of management rule, has set up personnel management systems of police, particularly while the police did in the test and trained with system of shunting, has finished the phased task, so in order to make personnel systems of police become more and more more perfect, make it content with the location , offer it in the family property, and do benefit to fostering outstanding talents, promote development forever, wish to offer authorities to consult with this research results , make police's personnel management march toward another new mileage.
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Akerman, Lisa. "Factors affecting the choice of business studies in the FET phase in three co-educational independent schools in KwaZulu-Natal." Diss., 2012. http://hdl.handle.net/10500/8742.
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The study population for the research comprised Grade 9 learners attending three co-educational, independent schools in KwaZulu-Natal in order to determine factors influencing the selection of business studies for FET phase. Methodology involved qualitative and quantitative approaches with closed and open-ended questionnaires plus one-on-one interviews. Descriptive statistics were produced and opened ended questions and interviews were examined for trends and influences. Findings reflected wide divergence in factual information, attitudes, and opinions on significant issues such as expected level of difficulty, influence of educators, parents and peers on selection, amount of work required and value of subject for future studies or careers. Conclusions were that there was a lack of completed research indicating a need for future research, greater preparation was required pre-FET level to assist decision making about selection of the subject which should involve parents, educators and input from the business world.Curriculum and Instructional Studies
M. Ed. (Curriculum Studies)