O consumo domiciliar de microcomputadores cresceu de forma acelerado nos últimos anos. Apesar de grupos com determinadas características socioeconômicas terem um consumo maior de computadores, o consumo vem aumentando em todos os grupos. Ou seja, mesmo com diferenças grandes, o consumo de computadores não é mais uma exclusividade dos mais ricos, dos mais bem instruídos ou de determinadas regiões do país. Os modelos Probit e double-hurdle se mostraram adequados para analisar o consumo de computadores no Brasil. O modelo Probit ajustou bem os dados na análise da presença de um computador no domicílio. Já para a despesa com computador, o modelo double-hurdle se mostrou melhor que o modelo Tobit, uma vez que este separa a análise do processo de decisão de compra em dois, separando a decisão de gastar da decisão de quanto gastar. / Household consumption of microcomputers grew up fast in recent years. Despite some socioeconomic groups take highercomputer consumption, consumption is increasing in all groups. In other words, even with large differences, the consumption of computers is no longer uniqueness of wealthier, better educated or at certain regions of the country. Probit and double-hurdle models were suitable for analyzing the consume of computers in Brazil. The Probit model adjusted well the data set in the analysis of the presence of a computer at home. For the computer spending the double-hurdle model proved better than Tobit because separates the analysis of the purchase decision process in two, separating the decision to spend from the decision of how much spend.

O consumo domiciliar de microcomputadores cresceu de forma acelerado nos últimos anos. Apesar de grupos com determinadas características socioeconômicas terem um consumo maior de computadores, o consumo vem aumentando em todos os grupos. Ou seja, mesmo com diferenças grandes, o consumo de computadores não é mais uma exclusividade dos mais ricos, dos mais bem instruídos ou de determinadas regiões do país. Os modelos Probit e double-hurdle se mostraram adequados para analisar o consumo de computadores no Brasil. O modelo Probit ajustou bem os dados na análise da presença de um computador no domicílio. Já para a despesa com computador, o modelo double-hurdle se mostrou melhor que o modelo Tobit, uma vez que este separa a análise do processo de decisão de compra em dois, separando a decisão de gastar da decisão de quanto gastar. / Household consumption of microcomputers grew up fast in recent years. Despite some socioeconomic groups take highercomputer consumption, consumption is increasing in all groups. In other words, even with large differences, the consumption of computers is no longer uniqueness of wealthier, better educated or at certain regions of the country. Probit and double-hurdle models were suitable for analyzing the consume of computers in Brazil. The Probit model adjusted well the data set in the analysis of the presence of a computer at home. For the computer spending the double-hurdle model proved better than Tobit because separates the analysis of the purchase decision process in two, separating the decision to spend from the decision of how much spend.

Salmonella and Escherichia coli O157:H7 (EC) contamination continues to be one of the major concerns for the microbiological safety of raw poultry and beef products. Application of more than one decontamination agent as a multi-hurdle intervention to carcasses in a processing line might produce greater reductions than one treatment alone due to different modes of action of individual antimicrobials. In this study, sequential spray applications of e-polylysine (EPL), lauric arginate and acidic calcium sulfate (ACS) solutions were evaluated against Salmonella Enteritidis (SE) and Salmonella Typhimurium (ST) on artificially inoculated broiler carcasses and against ST and EC on beef rounds and ground beef derived from the rounds. All possible 2-way combinations and individual applications of 20 % ACS (ACS20), 300 mg/liter EPL (EPL300) and 200 mg/liter LAE (LAE200) were evaluated using a sterile membrane filter model system. The combinations that provided higher Salmonella reductions were further evaluated on inoculated chicken carcasses using either response surface methodology (RSM) or in various concentrations applied in a sequential manner. Sequential spray applications of EPL300 - ACS 30 % (ACS30) or LAE200-ACS30 produced the highest Salmonella reductions on inoculated chicken carcasses. In a subsequent experiment, treatment of Salmonella inoculated carcasses with EPL300-ACS30 or LAE200-ACS30 combinations were found effective for reducing initial Salmonella counts by 1.5 and 1.8 log CFU/ml, respectively, immediately after treatment and by 1.2 and 1.8 log CFU/ml, respectively, following 6 days of storage at 4.4 °C. Evaluation of the resident microflora including aerobic plate counts (APC), E. coli, coliforms and psychrotrophs on uninoculated chicken carcasses after treatment with EPL300-ACS30 or LAE200-ACS30 and during storage indicated that these treatments have the potential to increase the shelf-life of poultry carcasses. Furthermore, application of warm (55 °C) EPL300-ACS30 or LAE200-ACS30 onto inoculated beef rounds reduced both ST and EC counts over 6 days of storage at 4.4 °C by 4.5 and 4.3 log CFU/cm2, respectively. Ground beef manufactured with EPL300-ACS30 or LAE200- ACS30 treated rounds had lower ST and EC counts initially and stayed lower over 4 days of storage at 4.4 °C when compared to control.

According to the 2003 National Household Survey, mean labour income for an indigenous worker is only 56% of that for a non-indigenous worker. Studies of ethnic discrimination in Peru’s labour markets generally find that discrimination is too low to explain inequalities of this magnitude. However, Sigma Theory (Figueroa 2003) predicts that social exclusion is a source of inter-ethnic inequality, and that has not been empirically tested. The primary aim of this paper is to fill this gap by estimating the extent to which exclusion and discrimination contribute to income inequality. Hurdle models are used to tackle down econometric endogeneity of years of schooling and truncation-at-zero of incomes. The results imply that exclusion plays a stronger role on inequality than discrimination: without exclusion, the Gini of labour income would decrease from 0.64 to 0.45, and without discrimination it would be reduced to 0.50. / De acuerdo a la Enaho 2003, el ingreso promedio de un trabajador indígena es solo 56% del de un trabajador no-indígena. Sin embargo, estudios sobre discriminación étnica en los mercados laborales de Perú usualmente hallan brechas demasiado pequeñas como para explicar la desigualdad observada. De acuerdo a Figueroa (2003), la exclusión social es una fuente importante de desigualdad interétnica, pero esto no ha sido contrastado empíricamente. El objetivo central de este documento es llenar esa brecha estimando qué porcentaje de la desigualdad se debe a exclusión y qué porcentaje a discriminación, comparando directamente los efectos. La metodología econométrica utilizada (hurdle models) permite incluir en el análisis a los trabajadores con ingresos nulos y contrarrestar problemas de endogeneidad econométrica. Los resultados implican que la exclusión juega un papel más importante que la discriminación. Sin exclusión, el Gini de ingresos laborales se reduciría de 0.64 a cerca de 0.45; sin discriminación, a alrededor de 0.50.

Research surrounding the steeplechase is scarce, with most research focusing primarily on how biomechanical factors relate to maintaining running speed while crossing barriers. One area that has not been well explored is the relationship between biomechanical factors and hurdling economy. The purpose of this study was to investigate how performance times and biomechanical variables relate to hurdling economy during the steeplechase. This was accomplished by measuring running economy of collegiate and professional steeplechasers while running with and without hurdles. Biomechanical measures of approach velocity, take-off distance, clearance height, and lead knee extension while hurdling, as well as steeplechase performance times were correlated to a ratio of running economy with and without hurdles. Results indicated no correlation between steeplechase performance time and the ratio of running economy during the hurdle and non-hurdle laps. Results also indicated no correlation between the aforementioned biomechanical variables and ratio of running economy during the hurdle and non-hurdle laps. Increasing approach velocity did not negatively affect running economy. Steeplechasers may continue to increase approach velocity without hurting their economy or performance times.

Yes / Flow experience has been widely investigated in experiential activities such as sports, the performing arts, gaming and Internet usage. Most studies focus on the positive aspects of flow experience and its effect on performance. In stark contrast, gambling research focusing on the negative side of addiction lacks an in-depth investigation of gamblers’ (positive) flow encounters. This separation of research lines seems out of place given that recent research indicates connections between flow and addiction. Joining both constructs in a causal effects model helps to gain a better understanding of their relationship and its contingencies. This paper empirically investigates whether and how it is possible to observe a “Janus face” of flow with its various sub-dimensions in online gambling. Empirical data was collected from 500 online gamblers by applying a structured questionnaire with established scales. The data was analyzed with a confirmatory factor analysis and a double-hurdle model to separate casual gamblers who are unsusceptible to any addiction issues from gamblers affected by initiatory addiction issues. The findings indicate that online gambling addiction is negatively influenced by two sub-dimensions of flow experience, namely a sense of control and concentration on the task at hand, while enhanced by a transformation of time and autotelic experience.

Title: Technique of Hurdle Clearing in 400 Meters Hurdles Authors: Jiří Jakoubek Supervisor: PhDr. Aleš Kaplan, Ph.D. Aims: The aim of this thesis is to describe technique of hurdle clearing in 400 meters hurdle race using study review and to examine this technique at particular athlete during training and racing sessions in 400 meters hurdles race. Methods: Technique was compared and examined at young athlete. Two kinograms were used for analysis, one from training and one from racing session. The comparison was made using third hurdle in second track. One hurdle clearance from each training and racing sessions with clearly visible individual phases of hurdle crossing were used. For better and well-arranged comparative analysis the same athlete was always examined. Technique of hurdle clearing is analysed thanks to using kinogram. The captured record was transmitted into appropriate format and elaborated in Kinovea program. For superior quality of presented snapshots program Corel photo-point 9.0 was used. Results: The goal of this thesis is to analyze technique of clearing the third hurdle in 400 meter race at particular athlete and to find differences and imperfections in applied technique. When comparing the technique of hurdle crossing at chosen athlete it was found that there are diferences...

In the sport of track and field, proper hurdling technique is a complicated combination of various running and jumping kinematics. With most research having been done on sprint hurdling, there is a growing need for research on hurdling events of different lengths. The intermediate hurdles (IH) and the steeplechase (SC) are two events where there are a number of differences in hurdling technique. This study compared the differences in hurdling technique between events (IH and SC) as well as the differences in technique between genders. Subjects for this study consisted of 20 elite intermediate hurdlers (10 male, 10 female) and 20 elite steeplechasers (10 male, 10 female). Subjects were filmed performing their respective events at the 2006 USA Outdoor Track and Field National Championships. A 2-D analysis was performed on each subject to determine differences between events and genders for the following variables: loss of horizontal velocity, peak center of mass relative to hurdle height, horizontal position at peak center of mass, deviation angle at takeoff, hurdle step length, penultimate, and recovery step lengths, takeoff and landing distance, minimum lead leg hip angle, trail leg knee height relative to the hip at peak height, trunk angle at peak height, landing angle, and finally, the ratio of the recovery step to the penultimate step. Significant differences (p < .05) were observed in 11 of the 13 variables analyzed. Steeplechasers showed significantly higher values than hurdlers in deviation angle, landing angle, minimum lead leg hip angle, peak height over the barrier, takeoff and landing distances, as well as penultimate, hurdle and recovery step lengths. Trail leg knee height was shown to be higher for hurdlers. Also, female steeplechasers were shown to have a greater trunk angle and loss of horizontal velocity than female hurdlers. Females showed higher values than males in deviation angle, landing angle, minimum lead leg hip angle, and peak height over the barrier. Landing distance, hurdle step length and trail leg knee height were higher for males. Also, female steeplechasers had a longer penultimate step length than males. Several differences in hurdling technique exist between events and gender. Hurdlers appear to place more emphasis on the kinematics which helps to promote a low center of mass hurdle clearance. Steeplechasers, on the other hand, are less pronounced with their hurdling kinematics. This is likely due to the greater economy required of the longer event. Gender differences appear to be, in large part, a function of differences in barrier height. As athletes and coaches go about evaluating and training hurdling technique, it is important to recognize the differences that exist between these different events.

Le travail présenté dans cette thèse prend pour cadre d'analyse les systèmes d'innovation et vise à étudier les effets et les déterminants des collaborations science-industrie. Notre démarche empirique repose sur la combinaison entre une analyse statistique et économétrique de données nationales, et la réalisation d'enquêtes exploratoires sur un territoire donné. Pour déterminer l'impact de ces collaborations sur l'innovation des firmes, nous considérons deux mesures de l'innovation : le dépôt de brevet et l'intensité d'innovation. En distinguant entre deux types de collaborations académiques que sont les collaborations avec les universités et établissements d'enseignement supérieur et les collaborations avec les organismes publics de recherche ou privés à but non-lucratif, il ressort de ce travail que ces collaborations ont un effet positif et significatif sur l'innovation. Les déterminants des collaborations science-industrie sont, quant à eux, analysés à travers deux enquêtes : l'une portant sur les entreprises d'un technopôle, et l'autre réalisée auprès d'enseignants-chercheurs d'une université. Les deux enquêtes révèlent que les entreprises collaborent avec des organismes académiques principalement pour rechercher des solutions aux problèmes qu'elles rencontrent, alors que les chercheurs s'engagent dans ces collaborations pour rester au courant des problématiques actuelles des acteurs économiques. Les résultats de la première enquête établissent en outre un caractère multiscalaire des collaborations science-industrie, ce qui relativise le poids de la proximité géographique permanente au profit d'une proximité géographique temporaire couplée à d'autres types de proximité. La seconde enquête, qui s'intéresse à la propension des chercheurs à collaborer montre que les déterminants de cet engagement diffèrent selon le type de collaboration. / The works presented in this thesis use systems of innovation as an analytical framework and aims to study the effects and determinants of science-industry collaborations. Our empirical approach relies on a combination of statistical and econometric analysis of national data, and exploratory surveys within a given territory. To determine the impact of these collaborations on firms' innovation, we consider two measures of innovation: patenting and innovative performance. Taking into accounts two types of academic collaboration, including collaborations with universities and establishments of higher education and public and nonprofit research organizations, it appears that these collaborations have a significant and positive effect on innovation. On the other hand, determinants of science-industry collaborations are analyzed through two surveys: one covering firms belonging to a technopole, and the other conducted among researchers from a university. Both surveys show that firms collaborate with academic organizations mainly to find solutions to problems they face, while researchers are involved in these collaborations to stay abreast of current issues of economic agents. The results of the first survey establish a mutliscalar nature of science-industry collaborations, which minimize the importance of permanent geographical proximity in favor of a temporary geographical proximity coupled with other types of proximity. The second survey, which focuses on the determinants of researchers' propensity to collaborate, shows that these determinants are different according to the type of collaboration.

nÃo hà / Nosso principal objetivo neste estudo à investigar o papel da heterogeneidade na atualizaÃÃo, depois de um choque de informaÃÃo, do risco subjetivo sobre vitimizaÃÃo de homicÃdio. Nesse sentido, os dados utilizados neste trabalho tambÃm atestam a superestimaÃÃo do crime encontrada na literatura. A novidade à que os entrevistados receberam um choque de informaÃÃo que consiste na taxa oficial de homicÃdios, mas a grande maioria deles mantÃm a mesma percepÃÃo inicial. Ao propor um modelo de Update Bayesiano permitindo que nenhuma atualizaÃÃo fosse realizada, dois modelos foram desenvolvidos: um Tobit modificado e um modelo Hurdle de dois nÃveis. Assim como em estudos anteriores, nossos resultados mostraram que poderÃamos prosseguir com uma abordagem de Update Bayesiano. Ainda, quanto mais altas as respostas iniciais eram definidas, mais propensos os indivÃduos estavam em proceder uma mudanÃa de percepÃÃo. AlÃm disso, fundamentalmente, pudemos racionalizar a decisÃo de nÃo revisar as respostas seguindo um argumento de qualidade/credibilidade da informaÃÃo percebida. Descobrimos que os participantes mais velhos e as mulheres sÃo mais relutantes nÃo apenas em alterar as respostas iniciais, mas tambÃm na escolha do nÃvel da nova resposta, em caso de mudanÃa. Outra conclusÃo feita foi que o nÃvel educacional dos entrevistados era insignificante em nosso exercÃcio. De fato, o nÃvel educacional do entrevistador teve um papel fundamental em ambas decisÃes de mudanÃa e magnitude de revisÃo. Finalmente, nossos resultados tambÃm levantaram fortes evidÃncias sobre aspectos de homofilia. A ocorrÃncia de uma correspondÃncia em gÃnero entre entrevistadores e entrevistados teve o maior impacto sobre a decisÃo de mudar e na magnitude da atualizaÃÃo neste estudo. / Our main purpose in this study is to investigate the role of heterogeneity into the update of subjective homicide victimization risk after an informational shock. In this sense, the data used here also attests the crime overestimation found in the literature. The novelty is that our respondents faced an informational shock consisting in the official homicide rate, but the vast majority of them keeps the same initial perception. In proposing a Bayesian Update model allowing that no update takes place, two models were developed: a modified Tobit and a two-tiered Hurdle model. In accordance with previous papers, our results showed that we could proceed with a Bayesian Update approach. Also, the higher initial responses are set, more likely individuals are in proceeding a change in perceptions. Furthermore, fundamentally, we could rationalize a non-updating decision following a perceived informational quality/credibility argument. We found that older participants and females are more reluctant not only to change initial responses, but also to choose the level of the new response, in case of an update. In addition, respondentsâ level of education was insignificant in our exercise. In fact, interviewersâ level of education had a key role in both the changing and updating magnitude decisions. Finally, our results also raised strong evidence on homophily aspects. The occurance of a matching in gender between interviewers and interviewees had a major impact on the decision to change and in the magnitude of the update in this study.