SpaceX Dragon Air Circulation System

The Dragon capsule is a reusable vehicle being developed by Space Exploration Technologies (SpaceX) that will provide commercial cargo transportation to the International Space Station (ISS). Dragon is designed to be a habitable module while it is berthed to ISS. As such, the Dragon Environmental Control System (ECS) consists of pressure control and pressure equalization, air sampling, fire detection, illumination, and an air circulation system. The air circulation system prevents pockets of stagnant air in Dragon that can be hazardous to the ISS crew. In addition, through the inter-module duct, the air circulation system provides fresh air from ISS into Dragon. To utilize the maximum volume of Dragon for cargo packaging, the Dragon ECS air circulation system is designed around cargo rack optimization. At the same time, the air circulation system is designed to meet the National Aeronautics Space Administration (NASA) inter-module and intra-module ventilation requirements and acoustic requirements. A flight like configuration of the Dragon capsule including the air circulation system was recently assembled for testing to assess the design for inter-module and intra-module ventilation and acoustics. The testing included the Dragon capsule, and flight configuration in the pressure section with cargo racks, lockers, all of the air circulation components, and acoustic treatment. The air circulation test was also used to verify the Computational Fluid Dynamics (CFD) model of the Dragon capsule. The CFD model included the same Dragon internal geometry that was assembled for the test. This paper will describe the Dragon air circulation system design which has been verified by testing the system and with CFD analysis

An empirical study of the determinants of Internet Banking adoption among Brazilians non-users

Este estudo investiga os fatores determinantes da adoção de Internet Banking entre não usuários brasileiros. Para tanto propõe-se um modelo que reúne os constructos dos modelos mais conhecidos de adoção de novas tecnologias da literatura de marketing. O modelo foi testado com amostra de 292 pessoas e os resultados revelam que os efeitos de oito variáveis sobre a intenção de usar o Internet Banking são significativos. São elas compatibilidade com estilo de vida, normas subjetivas, auto-eficácia, imagem, vantagem relativa de segurança e privacidade, vantagem relativa de controle, testagem e suporte tecnológico. Por outro lado, os efeitos das características individuais incluídas no modelo não se mostram significativos. A maior contribuição do estudo é a proposta de um modelo abrangente, simples e facilmente implementável. O estudo conclui apontando algumas implicações gerenciais, limitações e sugestões para estudos futuros.This study investigates the determinants of Internet Banking adoption among Brazilians non-users. To accomplish this objective, the study proposes a model built with constructs gathered from the most known models of new technology adoption found in the marketing literature. The model was tested among a sample of 292 people and the results show that the effects of eight variables were significant in determining the intention to adopt Internet Banking. They are compatibility with lifestyle, subjective norm, self-efficacy, image, relative advantage of security and privacy, relative advantage of control, trialability, and technological support. By the other side, none of the individual characteristics included in the model were significant. The major contribution of the study is the proposal of a comprehensive, simple, and easily implementable model. The study concludes by pointing some managerial implications, limitations, and suggestions for future studies

Comparing transformational and instrumental leadership The influence of different leadership styles on individual employee and financial performance in Brazilian startups

Abstract Purpose – The purpose of this study is to investigate the influence of transformational and instrumental leadership on the individual performance of the employee and the financial performance in Brazilian startups. Design/methodology/approach – The adopted methodological construction strategy was structural equation modeling, with the purpose of applying the model to primary data collected from a sample of leaders of Brazilian startups (n = 126). Findings – Results suggest that when leadership types are analyzed separately, both directly influence employee performance. Originality/value – This study has four main contributions: to test the influence of the two leadership styles on employee performance and thus to help advance the theoretical understanding of leadership; to perform this test in the context of Brazilian startups; to equip professionals with more information about the effects of crucial leadership types on individual type of employee performance; and to expand knowledge for recruitment and managerial training in initial-stage companie

Development-based Trust: Proposing and Validating a New Trust Measurement Model for Buyer-Seller Relationships

This study proposes and validates a trust measurement model for buyer-seller relationships. Baptized as development-based trust, the model encompasses three dimensions of trust: calculus-based, knowledge-based and identification-based. In addition to recognizing that trust is a multidimensional construct, the model also assumes that trust can evolve to take on a different character depending on the stage of the relationship. In order to test the proposed model and compare it to the characteristic-based trust measurement model, the measure most frequently used in the buyer-seller relationship literature, data were collected from 238 clients of an IT product wholesaler. The results show that the scales are valid and reliable and the proposed development-based trust measurement model is superior to the characteristic-based trust measurement model in terms of its ability to explain certain variables of interest in buyer-seller relationships (long-term relationship orientation, information sharing, behavioral loyalty and future intentions). Implications for practice, limitations and suggestions for future studies are discussed

Competing scales for measuring the perceived quality: a comparison between the Servqual and RSQ

Não há dúvida sobre a importância da qualidade de serviços como fator de sucesso empresarial, mas mensurar essa qualidade tem se mostrado um desafio quando se consideram diferentes contextos. Diante disso, o objetivo deste estudo foi testar duas escalas de mensuração da qualidade percebida de serviços. A comparação entre a escala Service Quality (Servqual) e a Retail Service Quality (RSQ), deu-se por meio de survey junto a 351 respondentes e utilizou como ambiente de pesquisa uma rede de home centers com lojas localizadas na cidade de São Paulo. Para analisar os dados obtidos, foram utilizadas as técnicas multivariadas de análise fatorial exploratória e confirmatória. Como resultado, as duas escalas demonstraram níveis aceitáveis de confiabilidade e validade. Entretanto, no teste de validade nomológica, a escala RSQ mostrou-se superior à escala Servqual, uma vez que a primeira foi capaz de explicar 43% da lealdade em relação ao varejista, enquanto a segunda explicou apenas 11%.There is no doubt about the importance of service quality as a factor of businesses' success, but to measure this quality has proved to be a challenge when one considers different environmental contexts. Given this, the main goal of this paper was to test two measurement scales of perceived service quality. The comparison between Service Quality scale (Servqual) and Retail Service Quality (RSQ) was conducted by means of a survey with 351 participants, clients of a home center stores chain located in the city of São Paulo. The data were analyzed using both exploratory and confirmatory factor analysis. As a result, both scales demonstrated acceptable levels of reliability and validity. However, the RSQ demonstrated a better performance in the nomological test since it was able to explain 43% of the loyalty towards the retailer, while the Servqual scale explained only 11%

Women, Health and Aging: Building a Statewide Movement

Provides an overview of current policy and program environments that affect the state's most vulnerable elder population, and considers some effective strategies to address the growing needs of older persons in California

Polar de un germen de curva irreducible de género uno

Sea f una curva plana irreducible con semigrupo (n, m), denotemos por K(n; m) el conjunto de curvas irreducibles topológicamente equivalentes a f, es sabido que el tipo topológico de la polar de una curva g, definida por P(g) = agx + bgy no es constante en el conjunto K(n; m) ver Ejemplo 1, o sea el tipo topológico de la polar no es un invariante topológico de la curva sino un invariente analítico. Sin embargo, Casas Alvero demostro que al menos generícamente el tipo topológico de la polar es constante en K(n; m) y su topología es determinada a partir de n y m. Nosotros daremos una prueba particular de esa a afirmación, describiendo además de modo explicito un abierto U en K(n; m) donde la topología de la polar es constante y bien determinada; además veremos el comportamiento de la polar de algunas curvas que no estan en el conjunto U.Tesi

Regulating regret via decreasing goal level:Comparing maximizers and satisficers

Regret is an important emotion in the context of decision making and has many implications for the behavior of consumers. Although regret may be an inevitable outcome, it is possible to cope with it through various regulation strategies. This research investigates one of those strategies, namely, decrease the goal level strategy (DGL), in which one regulates regret by reevaluating the negativity of an outcome. Two properly powered and preregistered experimental studies find that the DGL strategy effectively works in regulating individuals' post-decisional regret. Besides, the DGL effect is moderated by individuals' maximizing tendency. When maximizers engaged in the DGL strategy, by reappraising their decision and recognizing positive alternative goals, they regulated their regrets more successfully. For satisficers, in contrast, who are by default more prone to adopt the protective “good enough” choice, engaging in a DGL strategy did not affect their regrets. These results contribute to the literature on regret by empirically testing DGL as an effective regret regulation strategy, showing mechanisms that can help individuals to effectively cope with regret

THE USE OF RGT (REPERTORY GRID TECHNIQUE) IN MEASURING THE IMAGE OF SHOPPING CENTERS

À medida que aumenta o número e a variedade de shopping centers existentes no Brasil, aumenta a pressão sobre os praticantes de marketing para que compreendam melhor como os consumidores escolhem os shopping centers tanto para como área de compras quanto como área de lazer. Este estudo sugere que a técnica de repertory grid (RGT) é superior a outras técnicas geralmente utilizadas para avaliar as dimensões pelas quais um consumidor avalia um shopping center. A principal vantagem da técnica de repertory grid é que as dimensões pelas quais um objeto é avaliado e as suas importâncias relativas são obtidas diretamente dos consumidores sem qualquer interferência do pesquisador. O estudo introduz alguns conceitos básicos necessários para se entender a aplicação da técnica e a teoria na qual ela se baseia, a psicologia dos constructos pessoais desenvolvida por Kelly (1955). O estudo também apresenta alguns exemplos hipotéticos de como aplicar a técnica e suas principais limitações.With the number and variety of shopping centers in Brazil increasing, there is greater pressure on the practitioners of marketing to better understand how consumers choose shopping centers both as shopping and leisure areas. This study suggests that the technique of the repertory grid (RGT) is superior to other techniques which are generally used to evaluate the dimensions which a consumer uses to evaluate a shopping center. The main advantage of the repertory grid is that the dimensions through which an object is evaluated and its relative importance are directly obtained from the consumer with no interference from the researcher. The study introduces a number of necessary basic concepts to understand the application of the technique and the theory on which it is based, the psychology of personal constructs developed by Kelly (1955). The study also presents a number of hypothetical examples of how to apply the technique and its main limitations

The germination of a world: for a volcanic cosmopolitics

La compañía (2017-2019) es una muestra del artista mexicano Daniel Lezama en donde se narra visualmente algunos mecanismos de explotación intensiva en relación con la reproducción biótica de las especies, a la vez que pone en tensión una visión náhuatl, diversos cuerpos-máquina y la permanencia actante de los volcanes Popocatépetl e Iztaccíhuatl. Dicho lo anterior, a través del análisis de algunos materiales de la muestra sostenemos dos hipótesis. La primera tiene que ver con pensar La compañía como un imaginario antiedípico que muestra cómo los mecanismos de la colonización capitalista operan a través de la captura de múltiples intensidades pulsionales que crean realidades-mundo. La segunda hipótesis despliega que el inconsciente está estructurado según mecánicas extractivistas, en donde La compañía esboza un imaginario de germen-mundo y posibilita otra imagen pensamiento sobre la naturaleza en relación con sus geografías y sus lenguajesLa compañía (2017-2019) is an exhibition by the Mexican artist Daniel Lezama where some mechanisms of intensive exploitation in relation to the biotic reproduction of species are visually narrated, while it mobilizes a náhuatl imaginary, various body-machines, and the actant permanence of the Popocatépetl and Iztaccíhuatl volcanoes. Through the analysis of some of these materials, our essay advances two main hypotheses. The first posits La compañía as an anti-Oedipal imaginary that shows how the mechanisms of capitalist colonization operate through the capture of instinctual intensities that create world realities. The second hypothesis postulates that the unconscious is structured according to extractivist mechanics, while La compañía outlines an imaginary of a germ-world, enabling another thought-image about nature in relation to its geographies and its languages.Fil: Hernandez Galvan, Francisco. Benemérita Universidad Autónoma de Puebla; México. Consejo Nacional de Ciencia y Tecnología; MéxicoFil: de Mauro Rucovsky, Martin Adrian de Mauro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Humanidades. Universidad Nacional de Córdoba. Instituto de Humanidades; Argentina. Universidad Autónoma del Estado de México; Méxic