Creep-age forming of AA7475 aluminum panels for aircraft lower wing skin application

Creep-age forming (CAF) is an interesting process for the airframe industry, as it is able to form or shape panels into smooth, but complex, curvatures. In the CAF process, the ageing cycle of the alloy is used to relax external loads imposed to the part, through creep mechanisms. Those relaxed stresses impose a new curvature to the part. At the end of the process, significant spring back (sometimes about 70%) is observed and the success in achieving the desired form depends on how the spring back can be predicted in order to compensate it by tooling changes. Most of the applications relate to simple (non stiffened) panels. The present work deals with the CAF of aluminum panels for aircraft wing skin application. CAF was performed using vacuum-bagging autoclave technique in small scale complex shape stiffened panels, machined from an AA7475 alloy plate. An analytical reference model from the literature was employed estimate the spring back effect in such panel geometry. This model that deals with simple plates was adapted to stiffened panels using a geometric simplification, resulting in a semi-empirical model. The results demonstrate that CAF is a promising process to form stiffened panels, and the spring back can be roughly estimated through a simple model and few experiments.Empresa Brasileira de Aeronáutica S.A.Universidade Federal de São Paulo (UNIFESP) Departamento de Ciência e TecnologiaUNIFESP, Depto. de Ciência e TecnologiaSciEL

a meta-analysis

de Oliveira Santini, F., Ladeira, W. J., Sampaio, C. H., & Pinto, D. C. (2018). The brand experience extended model: a meta-analysis. Journal of Brand Management, 25(6), 519-535. DOI: 10.1057/s41262-018-0104-6This research provides a comprehensive overview of the brand experience effects and proposes an extension to the brand experience model by testing novel direct, moderating, and mediating relationships. The authors conducted a meta-analysis of 256 quantitative studies in 73 papers published between 2009 and 2015. The findings reveal new empirical generalizations about the relationship between brand experience and the relevant constructs. The findings demonstrate the positive influence of brand experience on brand satisfaction and positive influence of brand satisfaction on brand trust, brand loyalty, and word-of-mouth (WOM). Furthermore, this research uncovers important mediation variables (hedonic benefits, brand love, and brand personality) of the relationship between brand experience and brand satisfaction. This paper also tests the moderation effects of methodological (e.g., sample type, sample size), theoretical (product type and product lifecycle), and cultural variables (e.g., level of innovation, level of wealth and Human Development Index). The findings extend the brand experience model, helping managers to understand the positive outcomes of brand experience on satisfaction and to invest in actions that can enhance the brand experience. Furthermore, this study shows that brand managers should consider culture is a key factor when crafting branding experience strategies.authorsversionpublishe

Mechanical properties of dense cordierite discs sintered by solar radiation heating

Consolidation of cordierite disc specimens was undertaken under concentrated solar beam in a solar furnace at PSA (Plataforma Solar de Almerıá). Satisfactory extent of densification was achieved by the present solar-sintering experiment. The mechanical properties measured for the solar-sintered cordierite test pieces were; density ¼ 2:45 0:02 g/cm3, Vickers microhardness HV ¼ 7:31 0:29 GPa, Young’s modulus E ¼ 97 5 GPa, shear modulus G ¼ 38 2 GPa, Poisson ratio ¼ 0:27 0:01, fracture toughness KIC ¼ 1:50 0:15 MPa m1=2 and modulus of rupture evaluated by ring-on-ring test MORROR ¼ 57:8 13:7 MPa which were comparable to those of the counterparts sintered by conventional industrial gas furnace

Retail crowding: meta-analysis of contextual and cultural moderators

De Oliveira Santini, F., Ladeira, W. J., Pinto, D. C., Herter, M. M., Mattila, A. S., & Perin, M. G. (2022). Retail crowding: meta-analysis of contextual and cultural moderators. Marketing Intelligence and Planning, 40(1), 57-71. https://doi.org/10.1108/MIP-03-2021-0076Purpose – Although academics and retail managers share a common belief that crowded stores generate more sales, there is a growing concern about the negative impact of retail crowding on customer relationship management (CRM). This research aims to understand the underlying processes driving the effect, and it explores potential moderators that may mitigate the negative effects on consumer satisfaction. Design/methodology/approach – This research employs a meta-analysis on retail crowding effects and potential moderators. Findings – The integrative model of retail crowding reveals that social needs, crowd similarity, crowd expectation and uncertainty avoidance mitigate the negative retail crowding effects on satisfaction. Research limitations/implications – The authors advance the retailing literature by synthesizing recent studies on retail crowding. The findings also provide a clearer understanding of the mediating role of negative emotions in the relationship between retail crowding and satisfaction. Practical implications – This research offers guidance for retail managers on how to mitigate the harmful effects of crowding on customer satisfaction. Originality/value – This research contributes to the retailing literature and offers guidance for retailers on how to mitigate the harmful effects of crowding on customer satisfaction. Our moderation analyses provide insights into how and when crowding drives consumer satisfaction.authorsversionpublishe

a framework and meta-analysis

Santini, F. D. O., Ladeira, W. J., Pinto, D. C., Herter, M. M., Sampaio, C. H., & Babin, B. J. (2020). Customer engagement in social media: a framework and meta-analysis. Journal Of The Academy Of Marketing Science. [Advanced online publication on 27 May 2020]. Doi: https://doi.org/10.1007/s11747-020-00731-5This research examines customer engagement in social media (CESM) using a meta-analytic model of 814 effect sizes across 97 studies involving 161,059 respondents. Findings reveal that customer engagement is driven by satisfaction, positive emotions, and trust, but not by commitment. Satisfaction is a stronger predictor of customer engagement in high (vs. low) convenience, B2B (vs. B2C), and Twitter (vs. Facebook and Blogs). Twitter appears twice as likely as other social media platforms to improve customer engagement via satisfaction and positive emotions. Customer engagement is also found to have substantial value for companies, directly impacting firm performance, behavioral intention, and word-of-mouth. Moreover, hedonic consumption yields nearly three times stronger customer engagement to firm performance effects vis-à-vis utilitarian consumption. However, contrary to conventional managerial wisdom, word-of-mouth does not improve firm performance nor does it mediate customer engagement effects on firm performance. Contributions to customer engagement theory, including an embellishment of the customer engagement mechanics definition, and practical implications for managers are discussed.authorsversionpublishe

Heterogeneity along the Height in Disc Specimens of Graphite/Tungsten Powder Mixtures with Sub-Stoichiometric Carbon Atom Ratios Heated by Concentrated Solar Beam to 1600 C

Compositional heterogeneity along the thickness of compacted disc specimens of graphite/tungsten powder mixtures with substoichiometric carbon atom ratios (0.35, 0.50 and 1.00) heated by concentrated solar beam to 1600 C was characterised by X-ray diffraction. Top surface of any examined test piece was consisted purely of mono-carbide WC while the bottom surface showed different constitution depending on the net initial C/W ratio of the test piece; almost pure metallicWfor the C/W ¼ 0:35 specimen, dominant metallicWassociated with small proportion ofW2C for the C/W ¼ 0:50 and dominantW2C with trivial proportion of WC for the C/W ¼ 1:0. In the intermediate zone between the top and the bottom layers, the constitution held virtually constant depending on the nominal C/W ratio of the starting material: co-existing metallicWandW2C for the C/W ¼ 0:35, pureW2C for the C/W ¼ 0:50 and predominant WC with traceW2C for the C/W ¼ 1:00. Unlike for the top surface of the C/W ¼ 0:35 test piece heated in a solar furnace to 1900 C reported earlier, no evidence of formation of nano-meter scale WC whisker was detected for the top surface in any sample heated to 1600 C in the present work

MANIPULAÇÃO DO PLANO OCLUSAL PARA A OBTENÇÃO DE HARMONIA FACIAL EM CIRURGIAS ORTOGNÁTICAS BIMAXILARES

A correção das deformidades dento-faciais através do tratamento orto-cirúrgico normalmente requer cirurgias bimaxilares, a fim de obter um resultado funcional e estético ideal. A manipulação do complexo maxilo-mandibular através da rotação do plano oclusal no sentido horário ou anti-horário tem sido cada vez mais utilizada pelos cirurgiões responsáveis por esta modalidade de tratamento; e resultados comprovando a estabilidade destas movimentações têm sido recentemente publicados na literatura. O presente trabalho visa demonstrar um caso clínico de tratamento orto-cirúrgico através de cirurgia ortognática bimaxilar, onde a manipulação do plano oclusal foi essencial para o ótimo reposicionamento tridimensional da maxila e mandíbula, e consequentemente obtenção de harmonia facial favorável

Unicompartmental knee arthroplasty: current perspectives and trends in Brazil

OBJECTIVE: The aim of this study was to evaluate the approaches and procedures used by Brazilian orthopedic surgeons for treating osteoarthrosis by means of unicompartmental knee arthroplasty and high tibial osteotomy of the knee. METHODS: A questionnaire with 14 closed questions was developed and applied to Brazilian knee surgeons during the three days of the 43rd Brazilian Congress of Orthopedics and Traumatology. RESULTS: A total of 113 surgeons filled out the questionnaire completely and became part of the sample analyzed. In this study, the majority of the surgeons performed fewer than five unicompartmental knee arthroplasty procedures/year (61.1%) and between 5 and 15 high tibial osteotomy procedures/year (37.2%). Use of computerized navigation systems during surgery remains uncommon in our environment, since only 0.9% of the specialists were using it. 65.5% of the surgeons reported that they had chosen to use total knee arthroplasty rather than partial arthroplasty due to lack of familiarity with the surgical technique. When asked about the possibility that the number of unicompartmental prostheses used in Brazil would grow as surgeons in this country become increasingly familiar with the technique, 80.5% of the respondents believed in this hypothesis. In this sample, we found that the greater the surgeon's experience was, the greater the numbers of unicompartmental prostheses and tibial osteotomies performed annually were (r = 0.550 and r = 0.465, respectively; p < 0.05). CONCLUSIONS: There is a clear evolutional trend towards treatment of unicompartmental osteoarthritis using partial knee arthroplasty in Brazil. However, further prospective controlled studies are needed in order to evaluate the clinical and scientific benefits of these trends.OBJETIVO: O objetivo deste estudo é avaliar as condutas e procedimentos realizados pelos cirurgiões de joelho do Brasil no tratamento da osteoartrose com artroplastia unicompartimental e osteotomia tibial alta do joelho. MÉTODOS: Um questionário de 14 questões fechadas foi elaborado e aplicado a cirurgiões brasileiros de joelho durante os três dias do 43º Congresso Brasileiro de Ortopedia e Traumatologia. RESULTADOS: Um total de 113 cirurgiões de joelho preencheram completamente o questionário e fizeram parte da amostra analisada. Neste estudo, a maioria dos cirurgiões realizava menos de cinco artroplastias unicompartimentais do joelho/ano (61,1%) e entre cinco e 15 osteotomias tibiais altas/ano (37,2%). A utilização de navegação computadorizada no intraoperatório é ainda infrequente em nosso meio, sendo realizada por apenas 0,9% dos especialistas. A opção pelo uso da artroplastia total do joelho em detrimento da parcial devido à falta de familiaridade com a técnica cirúrgica foi relatada por 65,5% dos cirurgiões. Quando arguidos sobre a possibilidade de crescimento no número de próteses unicompartimentais no Brasil com o aumento da familiaridade com a técnica pelos cirurgiões do País, 80,5% dos entrevistados responderam que acreditam nesta hipótese. Nesta amostra, constatamos que quanto maior a experiência do cirurgião maior o número de próteses unicompartimentais e osteotomias tibiais realizadas anualmente (r = 0,550 e r = 0,465, respectivamente, e p < 0,05). CONCLUSÕES: Existem claras tendências em evolução no tratamento da osteoartrose unicompartimental com artroplastia parcial do joelho no Brasil. No entanto, mais estudos prospectivos controlados são necessários para avaliar o benefício clínico e científico destas tendências.Universidade Federal de São Paulo (UNIFESP) Departamento de Ortopedia e Traumatologia Centro de Traumatologia do EsporteUniversidade Federal de São Paulo (UNIFESP) Departamento de Ortopedia e TraumatologiaUNIFESP, Depto. de Ortopedia e Traumatologia Centro de Traumatologia do EsporteUNIFESP, Depto. de Ortopedia e TraumatologiaSciEL

Impact of One-Catheter Strategy with TIG I Catheter on Coronary Catheterization Performance and Economic Costs

Background: Coronary angiography with two catheters is the traditional strategy for diagnostic coronary procedures. TIG I catheter permits to cannulate both coronary arteries, avoiding exchanging catheters during coronary angiography by transradial access. Objective: The aim of this study is to evaluate the impact of one-catheter strategy, by avoiding catheter exchange, on coronary catheterization performance and economic costs. Methods: Transradial coronary diagnostic procedures conducted from January 2013 to June 2017 were collected. One-catheter strategy (TIG I catheter) and two-catheter strategy (left and right Judkins catheters) were compared. The volume of iodinated contrast administered was the primary endpoint. Secondary endpoints included radial spasm, procedural duration (fluoroscopy time) and exposure to ionizing radiation (dose-area product and air kerma). Direct economic costs were also evaluated. For statistical analyses, two-tailed p-values < 0.05 were considered statistically significant. Results: From a total of 1,953 procedures in 1,829 patients, 252 procedures were assigned to one-catheter strategy and 1,701 procedures to two-catheter strategy. There were no differences in baseline characteristics between the groups. One-catheter strategy required less iodinated contrast [primary endpoint; (60-105)-mL vs. 92 (64-120)-mL; p < 0.001] than the two-catheter strategy. Also, the one-catheter group presented less radial spasm (5.2% vs. 9.3%, p = 0.022) and shorter fluoroscopy time [3.9 (2.2-8.0)-min vs. 4.8 (2.9-8.3)-min, p = 0.001] and saved costs [149 (140-160)-€/procedure vs. 171 (160-183)-€/procedure; p < 0.001]. No differences in dose-area product and air kerma were detected between the groups. Conclusions: One-catheter strategy, with TIG I catheter, improves coronary catheterization performance and reduces economic costs compared to traditional two-catheter strategy in patients referred for coronary angiography

Models of Self in Families of People with Spina Bifida

Os modelos de self revelam a visão cultural acerca das competências que as crianças devem adquirir e tendem a ser compartilhados pelas pessoas que integram o mesmo ambiente. Neste sentido, este estudo objetiva avaliar os modelos de self em famílias de pessoas com espinha bífida. Dezessete cuidadores responderam um questionário virtual contendo questões sociodemográficas e três Escalas de Self: Autônomo, Relacionado e Autônomo Relacionado. Os dados foram tratados por meio de estatística descritiva, com técnicas de análises multivariadas. Os principais resultados indicam que o modelo de self mais valorizado foi o autônomo relacional que se reflete no desejo que os filhos e filhas desenvolvam a autonomia e, também, relacionamentos interpessoais. Tal modelo, porém, distingue-se dos grupos familiares de pessoas com desenvolvimento típico que residem no mesmo ambiente cultural, o que evidencia a necessidade das famílias de pessoas com espinha bífida receberem apoio para alcançarem seus alvos desenvolvimentais.Los modelos de self revelan la visión cultural de las habilidades que los niños deben adquirir y suelen ser compartidos por personas que pertenecen a un mismo entorno. Así, este estudio tiene como objetivo evaluar los modelos de self en familias de personas con espina bífida. Diecisiete cuidadores contestaron un cuestionario virtual que contiene preguntas demográficas y tres Escalas de Self: Autónomo, Relacional y Autónomo-relacional. Los datos fueron analizados mediante estadística descriptiva, con las técnicas del análisis multivariado. Los principales resultados indican que el modelo de self más valorado es el autónomo relacional, que se refleja en el deseo de que los hijos e hijas puedan desarrollar la autonomía y también las relaciones interpersonales. Este hallazgo es distinto de los grupos familiares de personas con desarrollo típico del mismo entorno cultural. Por eso, las familias de personas con espina bífida deben recibir apoyo para lograr sus objetivos de desarrollo.Models of self reveal cultural views regarding the competences that children should acquire, and these views tend to be shared by people within the same environment. Thus, this study aims to evaluate the models of self in families of people with spina bifida. Seventeen caregivers answered an online questionnaire containing socio-demographic questions and three scales of self: autonomous, related and autonomous-related. The data were analyzed using descriptive statistics and techniques of multivariate analysis. The main results indicate that the most valued model of self was the autonomous-related model, reflecting the desire that children develop autonomy as well as interpersonal relationships. Such a model, however, is distinct from that of family groups of people with typical development living in the same cultural environment, indicating the need for families of people with spina bifida to receive support to reach their developmental goals