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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
721

Realizace SWOT analýzy pro vybranou firmu / The Implementation of a SWOT analysis for selected company

PAULÍK, Martin January 2013 (has links)
The aim of the thesis is to use the SWOT analysis to identify threats and opportunities of the selected company on the market with regards to its strenghts and weaknesses, or a proposal to remove or eliminate the weaknesses.
722

Características de personalidade e comprometimento organizacional

Cervo, Clarissa Socal January 2007 (has links)
Os estudos sobre comprometimento organizacional vêm se expandindo no cenário internacional e nacional e apresentam diferentes focos de investigação. A relação entre o Comprometimento Organizacional e a personalidade no referencial teórico do Modelo dos Cinco Grandes Fatores – Big Five é o objetivo dessa pesquisa. Os participantes foram 269 profissionais entre 17 e 80 anos de idade, oriundos de empresas públicas e privadas. Os instrumentos utilizados foram um questionário sócio-demográfico, uma Escala de Comprometimento Organizacional, e as Escalas Fatoriais de Extroversão, Socialização e Abertura. As análises de Regressão apontaram que as variáveis que apresentam maior efeito sobre o Comprometimento Organizacional foram Abertura e alguns subfatores das Escalas de Extroversão e Socialização. Já a natureza das instituições (pública e privada) influenciou no vínculo que os trabalhadores desenvolvem com a organização sendo que esse vínculo é respaldado por diferentes fatores da personalidade. A percepção dos colaboradores quanto ao apoio que as empresas oferecem para o desenvolvimento profissional e o tempo de atividade no mesmo local de trabalho foram as variáveis mais significativas na interação com o Comprometimento Organizacional. / Studies on commitment to organizations are expanding in both national and international scenes and there are multiple focuses of investigation and research. The study of the relationship between commitment to organizations and personality in the context of the Big Five Model is the goal of this research. The participants were 269 professionals, 17 to 80 years old, working in state-controlled companies or in private companies. The instruments used were a social-demographic questionnaire, the Scale of Organizational Commitment, and the factorial Scales of Extraversion, Agreeableness and Openness. An analysis of regression showed that the variables that had most effect on organizational commitment were openness, some sub-factors of extraversion and agreeableness. No significant relationship was found between these construct. The nature of the institution (state-controlled or private) affected the bond between the workers and the organization, mediated by different personality factors. The perception of the workers about the support the companies offer to personal development and the time of activity in the same company were the most significant variables to determine organizational commitment.
723

Influencers på Instagram : en studie om kvinnors köpbenägenhet / Influencers on Instagram : a study of women's propensity to buy

Andersson, Jennie, Bazso, Tove January 2018 (has links)
Influencer marketing påstås vara ett marknadsföringsverktyg som ligger rätt i tiden. Dennamarknadsföringsmetod handlar om att använda sig utav influencers för att sprida ett företagsvarumärke och produkter. På sociala medier kan influencers lägga upp bilder och videos ochmånga anser att influencer marketing är mer trovärdigt och personligt än till exempel reklampå TV. Denna trovärdighet bidrar till att konsumenters köpbenägenhet ökar eftersom mankänner tillhörighet och samhörighet med influencers.Syftet med denna studie är att undersöka vilken betydelse influencer marketing har påInstagram och om de har någon inverkan på unga kvinnors köpbenägenhet, och i så fall vilkeninverkan det har. Två forskningsfrågor har tagits fram för att uppfylla syftet och med hjälp avett kvalitativt angreppssätt och vetenskapliga artiklar har forskarna jämfört det insamladeempiriska materialet. Den kvalitativa metoden bestod av tre stycken fokusgrupper där urvaletvar unga kvinnor mellan 20–25 år.Efter att ha analyserat resultatet har forskarna kommit fram till att influencer marketing har enstor påverkan på unga kvinnors köpbenägenhet. Forskarna menar att det som en influencerlägger upp på Instagram inte alltid behöver leda till ett köp, utan det leder mer till att ett behovoch en köpbenägenhet skapas av de bilder som dyker upp i flödet. Hur influencer marketinguppfattas av konsumenter är något individuellt men det tycks ändå vara enmarknadsföringsmetod som fungerar då det upplevs trovärdigt. / Influencer marketing påstås vara ett marknadsföringsverktyg som ligger rätt i tiden. Denna marknadsföringsmetod handlar om att använda sig utav influencers för att sprida ett företagsvarumärke och produkter. På sociala medier kan influencers lägga upp bilder och videos och många anser att influencer marketing är mer trovärdigt och personligt än till exempel reklam på TV. Denna trovärdighet bidrar till att konsumenters köpbenägenhet ökar eftersom man känner tillhörighet och samhörighet med influencers. Syftet med denna studie är att undersöka vilken betydelse influencer marketing har på Instagram och om de har någon inverkan på unga kvinnors köpbenägenhet, och i så fall vilken inverkan det har. Två forskningsfrågor har tagits fram för att uppfylla syftet och med hjälp av ett kvalitativt angreppssätt och vetenskapliga artiklar har forskarna jämfört det insamlade empiriska materialet. Den kvalitativa metoden bestod av tre stycken fokusgrupper där urvalet var unga kvinnor mellan 20–25 år. Efter att ha analyserat resultatet har forskarna kommit fram till att influencer marketing har en stor påverkan på unga kvinnors köpbenägenhet. Forskarna menar att det som en influencer lägger upp på Instagram inte alltid behöver leda till ett köp, utan det leder mer till att ett behov och en köpbenägenhet skapas av de bilder som dyker upp i flödet. Hur influencer marketing uppfattas av konsumenter är något individuellt men det tycks ändå vara en marknadsföringsmetod som fungerar då det upplevs trovärdigt.
724

Organisational transformation using total quality management and ISO 9000

Nabe, Percival Mvuyisi January 2008 (has links)
To be submitted in partial fulfilment of the requirements for the degree MAGISTER TECHNOLOGIAE in Quality Faculty of Engineering CAPE PENINSULA UNIVERSITY OF TECHNOLOGY 2008 / Engineering by its very nature is associated with quality processes. Ineffective processes have the potential to jeopardize the chances of providing consistently, products that meet customer and applicable regulatory requirements. By implication, this senario also calls for organizational transformation. SA Five Engineering (Pty) Ltd (SAF), which will serve as the target organization for this research study has in the past year suffered numerous complaints of poor products as a result of ineffective processes, impacting on production quality. Both 150 9000 and the concept of Total Quality Management have the potential to mitigate ineffective processes within SAF. The key research objective with this research study, is to recommend how to improve ineffective processes and the competitive advantage of SAF through improved products. Furthermore, to analyze the business organization in order to determine the extent to which Total Quality Management principles are deployed with the aim of developing a model, which will serve as a benchmark for sustained improvement. The research problem deals with ineffective processes within SAF which impacts adversely on delivery of quality products and services. The research design and methodology to be conducted within the ambit of this research study is applied research, as applied research is designed to apply its findings to solve a specific existing problem. The research will furthermore fall in the social world as the research relates to a structured business research study pertaining to how things are, and why. The research will be conducted from both an empirical and theoretical research paradigm, using a survey for the purpose of data collection. The research method that will be applied within the context of this research study will be a case study research.
725

The development of an artificial hand using nickel-titanium as actuators

Longela, Makusudi Simon January 2013 (has links)
Thesis (MTech (Mechanical Engineering))--Cape Peninsula University of Technology, 2013. / This thesis outlines a proposed mechanical design, prototyping and testing of a five fingered artificial hand made of 15 articulated joints actuated by Shape Memory Alloys (SMAs) mimicking muscular functions. SMAs Artificial muscles were incorporated in the forearm and artificial tendons made of nylon wires passing through a hollow palm transmit the pulling force to bend the fingers. Torsion springs set in each joint of the fingers create enough restoring force to straighten the finger when the actuators are disengaged. Nickel-Titanium (NiTi) wires were intrinsically embedded within the hand structure allowing significant movements mimicking human hand-like gestures. A control box made of switches connected to the artificial hand helps to control each gesture. A modular approach was taken in the design to facilitate the manufacture and assembly processes. Nickel-Titanium wires were used as actuators to perform the artificial muscle functions by changing their crystallographic structures due to Joule's heating. Rapid prototyping techniques were employed to manufacture the hand in ABS plastic.
726

Desenvolvimento e testes de um conversor eletromagnético de 3 para 5 fases

Souza, Giancarlo de January 2016 (has links)
A dissertação aborda o desenvolvimento e testes de um conversor eletromagnético de 3 para 5 fases, sendo inicialmente avaliadas configurações conhecidas usando vários tipos de ligações. Foi desenvolvido um modelo baseado em resistências e indutâncias próprias e mútuas, para as quais caminhos de fluxo magnético através do núcleo de aço silício e também através do ar em torno dos enrolamentos foram considerados. Com base no modelo desenvolvido e nos resultados das simulações realizadas com o modelo, na sequência, foi projetado e construído um protótipo. O projeto levou em conta aspectos como equilíbrio de tensão nos secundários sob carga, aproveitamento do material dos enrolamentos e do núcleo, assim como a facilidade de conexão dos enrolamentos. Para as simulações do modelo utilizou-se o software Micro- Cap, tendo sido avaliado o equilíbrio nas tensões de saída do conversor sob carga equilibrada e desequilibrada, além de avaliar seu comportamento diante de falhas (abertura) de uma das fases da carga dos secundários. Os resultados das simulações foram comparados com os ensaios realizados no protótipo utilizando cargas resistivas e também um motor de indução pentafásico, tendo sido observada uma boa concordância entre ambos. Para as cargas resistivas utilizadas nos ensaios, as tensões ficaram muito próximas da simulação, mantendo as tensões nos secundários dentro de níveis aceitáveis de desequilíbrio. Contudo, na operação sob falha em uma das fases da carga, o nível de desequilíbrio de tensão apresentou-se acima do aceitável. Já para o motor de indução pentafásico utilizado nos ensaios, as tensões nos secundários apresentaram níveis aceitáveis de desequilíbrio, mesmo na operação sob falha em uma das fases da carga e independente da conexão dos enrolamentos primários. Finalmente, a indução no núcleo do conversor foi avaliada, sendo que em todos os ensaios e simulações, os valores máximos nas colunas do transformador não ultrapassaram os limites projetados, mostrando que não houve efeitos significativos de saturação e assim mantendo níveis aceitáveis de perdas no ferro. / This work addresses the development and test of an electromagnetic converter which can convert a three-phase system into a five-phase system. Initially, known configurations are evaluated which use several different types of connections. A prototype was designed and built considering aspects such as (1) voltage balanced under load on the secondary side, (2) utilization of the conductor and core material, and (3) difficulty to connect the windings. In order to evaluate the performance of the converter, a model was developed which is based on resistances, self inductance, and mutual inductances; for the determination of these inductances, the flux paths through the yokes and also through the air space surrounding the windings have been considered, besides the iron characteristic. The model was implemented using the software Micro-Cap, being assessed the voltage balance on the secondary side under balanced and also unbalanced load; in addition, the performance was evaluated under the occurrence of a fault on the secondary side (loss of one phase). The results obtained through simulations were compared with practical results measured on the prototype connected to a resistive load and also to a five-phase induction machine, being a good agreement between both results observed. For the resistive loads used during the tests, the voltages were very close to the predicted values, being the output voltages within an acceptable level of unbalance. However, for the operation under fault in one phase, the secondary voltages showed not acceptable unbalance. For the operation of the induction machine, the secondary voltages showed acceptable unbalance, even for the operation under fault and for all types of connection on the primary side. Finally, the induction in the magnetic yokes of the converter was investigated; in all tests and simulations, the maximal values in the magnetic parts did not surpass the design limits, ensuring that no significant saturation effects took place and thus keeping the magnetic losses within acceptable limits.
727

Otimização multiobjetivo de uma máquina pentafásica utilizando NSGA-II

Dias, Tiago Fouchy January 2016 (has links)
Neste trabalho é desenvolvida uma metodologia de otimização multiobjetivo baseada no NSGA-II (Nondominated Sorting Genetic Algorithm), a qual visa a otimização do projeto de máquinas de indução pentafásicas. A escolha deste tipo de máquina se justifica pelo fato de que elas apresentam vantagens importantes quando comparadas com as trifásicas convencionais, tais como maior potência e maior torque para um mesmo volume de material ativo, além da possibilidade de operar na ocorrência de falhas (perda de uma ou duas fases). Na otimização de máquinas de indução vários objetivos podem ser definidos, sendo estes muitas vezes conflitantes. Neste contexto, este trabalho visa obter soluções que representam um compromisso entre dois objetivos: rendimento e custo do material ativo (ferro e material condutor). O algoritmo de otimização desenvolvido e implementado utiliza dois controles de diversidade da população, um baseado no fenótipo dos indivíduos, que é característico do NSGA-II, e outro adicional que é baseado no genótipo. A geometria do estator e do rotor da máquina e o seu modo de acionamento são parametrizados por 14 variáveis inteiras. O método desenvolvido foi implementado no Matlab R e aplicado a um caso prático de otimização de uma máquina de indução pentafásica considerando os dois objetivos citados. Os resultados práticos mostram que o método é capaz de obter projetos otimizados com maior rendimento e menor custo aproveitando as características particulares deste tipo de máquina. / In this work, it is developed a method of multiobjective optimization based on NSGAII (Nondominated Sorting Genetic Algorithm), which aims at optimizing the design of five-phase induction machines. The choice of this particular type of machine is justified by the fact that they have important advantages over conventional three-phase machines, such as higher power and higher torque for the same volume of material; in addition, they can operate under fault (loss of one or even two phases). When optimizing induction machines, several objectives can be defined, which are often conflicting. In this context, this work aims to obtain solutions that represent a trade-off between two objectives: efficiency and cost of active material (iron and conductor materials). The optimization algorithm that was developed and implemented uses two types of control for the diversity of the population, one based on the phenotype of the individuals, characteristic of the NSGA-II, and another one based on the genotype. The geometrical dimensions of the stator and rotor, together with the driving strategy, are parameterized by 14 integer variables. The developed method was implemented using Matlab R and applied to a practical case of a five-phase induction machine considering the aforementioned objectives. The practical results show that the method can lead to an optimized design with higher efficiency and at a lower cost, accounting for the special characteristics of this type of machine.
728

Vývoj vztahu dítěte a dobrovolníka v Programu Pět P / The evolution of the relationship between child and volunteer in Program Five P

NOHEJLOVÁ, Pavla January 2010 (has links)
The issue of the child {--} volunteer relation development in the Five Ps Programme is a really sensitive one. No research dealing with the child {--} volunteer relation development has been performed yet in the Czech Republic. The child {--} volunteer relation development research is based on mapping changes within the eight dimensions of a relation as per Hinde´s theory (1988). The theoretical part of the thesis deals with the Five Ps programme itself, its brief history, handicaps and benefits. The theoretical part also deals with relations in general and the relation child {--} volunteer in the Five P programme and its development. The thesis is aimed at mapping the child {--} volunteer relation development in the Five Ps programme upon changes in the above eight relation dimensions. The practical part employed the questioning method, the technique of structured interview with open questions, the method of participant observation and document analyses. The research sample consisted of 15 respondents (5 volunteers, 5 children, 5 legitimate representatives of the children). The survey was performed at the regional Five P Programme Centre in Písek. The results of the work consist of analyses of interview with the volunteers, children and legitimate representatives after three months and after ten months of a relation, then observation of each couple during common activities, analyses of supervision records and meeting minutes. Two hypotheses arose from the results. The first is: The child {--} volunteer relation in the Five P programme develops in eight dimensions as per Hinde´s theory (1988). The other hypothesis is: Each child {--} volunteer relation in the Five Ps programme develops differently. The thesis also includes practical recommendations, particularly to beginning Five Ps coordinators. These recommendations present examples of questions by which changes in the individual relationship dimensions may be monitored and the relationship development better observed. The thesis may be useful either for beginning coordinators in the Five Ps programme or for those having longer experience in coordinating the couples in the programme.
729

Medição da velocidade de queima laminar de biogás e gás de síntese através do método do fluxo de calor e comparação com mecanismos cinéticos

Nonaka, Hugo Ohno Barbosa January 2015 (has links)
A velocidade de queima laminar adiabática é um importante parâmetro da combustão que dita o comportamento de chamas pré-misturadas. Dos métodos disponíveis para a medição desse parâmetro, o método do fluxo de calor destaca-se pela simplicidade e precisão. No presente trabalho, esse método é utilizado para medir a velocidade de queima de biogás (modelado como CH4 com diferentes níveis de diluição com CO2) e de gás de síntese (modelado como uma mistura de CH4, H2, CO, CO2 e N2) em ar a 298 K e 1 atm. Tais gases são de crescente interesse para a sociedade em função de aspectos ambientais, porém, suas velocidades de queima não foram amplamente estudadas ainda. Os resultados obtidos são comparados com as previsões de cinco mecanismos cinéticos (GRI-Mech 3.0, Davis et al., Konnov, San Diego e USC Mech II) a fim de avaliar a sua capacidade preditiva. Os resultados experimentais e numéricos das velocidades de queima de biogás e ar apresentam uma boa concordância e as incertezas encontradas foram condizentes com as relatadas na literatura. Os resultados experimentais desse gás foram parametrizados em uma correlação empírica de fácil utilização em modelos numéricos. As medições da velocidade de queima de gás de síntese e ar, por outro lado, apresentaram valores inferiores às previsões numéricas de todos os mecanismos estudados. Os dados experimentais da literatura, para a mesma mistura, diferem tanto em valores quanto em comportamento dos resultados do presente trabalho. Tal comportamento está provavelmente relacionado a alguma contaminação no CO utilizado, já que quando esse gás está presente observa-se uma chemi-luminescência não relatada na literatura. / The adiabatic laminar burning velocity is an important combustion parameter that dictates premixed flames characteristics. Among the measuring methods available in literature, the heat flux method stands out for its simplicity and accuracy. In the present work, this method is used to measure the adiabatic laminar burning velocity of biogas (modeled as CH4 with different dilution levels with CO2) and syngas (modeled as a CH4, H2, CO, CO2 and N2 mixture) in air at 298 K and 1 atm. Such gases are of growing society interest due to environmental aspects, however, their adiabatic laminar burning velocity have not been widely studied yet. The experimental results are compared to predictions of five kinetic mechanisms (GRI-Mech 3.0, Davis et al., Konnov, San Diego e USC Mech II) to evaluate their predictive capacity. Experimental and numerical results of biogas/air mixtures adiabatic laminar burning velocity show good agreement and the found uncertainties are in agreement with literature. Experimental results of this gas were fitted in an empiric correlation of simple numerical application. Experimental results of the laminar burning velocity of syngas/air, on the other hand, show lower values than the numerical predictions of all studied kinetic mechanisms. Literature available data for the same mixture differ both in values and behavior of the present work results. Such behavior is probably related to some contamination on the CO used since a chemi-luminescence not reported in literature can be noted when this gas is present.
730

Medição da velocidade de queima laminar de biogás e gás de síntese através do método do fluxo de calor e comparação com mecanismos cinéticos

Nonaka, Hugo Ohno Barbosa January 2015 (has links)
A velocidade de queima laminar adiabática é um importante parâmetro da combustão que dita o comportamento de chamas pré-misturadas. Dos métodos disponíveis para a medição desse parâmetro, o método do fluxo de calor destaca-se pela simplicidade e precisão. No presente trabalho, esse método é utilizado para medir a velocidade de queima de biogás (modelado como CH4 com diferentes níveis de diluição com CO2) e de gás de síntese (modelado como uma mistura de CH4, H2, CO, CO2 e N2) em ar a 298 K e 1 atm. Tais gases são de crescente interesse para a sociedade em função de aspectos ambientais, porém, suas velocidades de queima não foram amplamente estudadas ainda. Os resultados obtidos são comparados com as previsões de cinco mecanismos cinéticos (GRI-Mech 3.0, Davis et al., Konnov, San Diego e USC Mech II) a fim de avaliar a sua capacidade preditiva. Os resultados experimentais e numéricos das velocidades de queima de biogás e ar apresentam uma boa concordância e as incertezas encontradas foram condizentes com as relatadas na literatura. Os resultados experimentais desse gás foram parametrizados em uma correlação empírica de fácil utilização em modelos numéricos. As medições da velocidade de queima de gás de síntese e ar, por outro lado, apresentaram valores inferiores às previsões numéricas de todos os mecanismos estudados. Os dados experimentais da literatura, para a mesma mistura, diferem tanto em valores quanto em comportamento dos resultados do presente trabalho. Tal comportamento está provavelmente relacionado a alguma contaminação no CO utilizado, já que quando esse gás está presente observa-se uma chemi-luminescência não relatada na literatura. / The adiabatic laminar burning velocity is an important combustion parameter that dictates premixed flames characteristics. Among the measuring methods available in literature, the heat flux method stands out for its simplicity and accuracy. In the present work, this method is used to measure the adiabatic laminar burning velocity of biogas (modeled as CH4 with different dilution levels with CO2) and syngas (modeled as a CH4, H2, CO, CO2 and N2 mixture) in air at 298 K and 1 atm. Such gases are of growing society interest due to environmental aspects, however, their adiabatic laminar burning velocity have not been widely studied yet. The experimental results are compared to predictions of five kinetic mechanisms (GRI-Mech 3.0, Davis et al., Konnov, San Diego e USC Mech II) to evaluate their predictive capacity. Experimental and numerical results of biogas/air mixtures adiabatic laminar burning velocity show good agreement and the found uncertainties are in agreement with literature. Experimental results of this gas were fitted in an empiric correlation of simple numerical application. Experimental results of the laminar burning velocity of syngas/air, on the other hand, show lower values than the numerical predictions of all studied kinetic mechanisms. Literature available data for the same mixture differ both in values and behavior of the present work results. Such behavior is probably related to some contamination on the CO used since a chemi-luminescence not reported in literature can be noted when this gas is present.

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