Browsing by Issue Date, starting with "2023-05-17"
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- Global Operator Calculus on Spin GroupsPublication . Cerejeiras, P.; Ferreira, M.; Kähler, U.; Wirth, J.n this paper, we use the representation theory of the group Spin(m) to develop aspects of the global symbolic calculus of pseudo-differential operators on Spin(3) and Spin(4) in the sense of Ruzhansky–Turunen–Wirth. A detailed study of Spin(3) and Spin(4)-representations is made including recurrence relations and natural differential operators acting on matrix coefficients. We establish the calculus of left-invariant differential operators and of difference operators on the group Spin(4) and apply this to give criteria for the subellipticity and the global hypoellipticity of pseudo-differential operators in terms of their matrix-valued full symbols. Several examples of first and second order globally hypoelliptic differential operators are given, including some that are locally neither invertible nor hypoelliptic. The paper presents a particular case study for higher dimensional spin groups.
- Plano de Negócios: Symbiosis Eco ResortPublication . Mareco, Pedro Henrique Silva; Carvalho, Mário João Paulo de JesusO Glamping, ou acampamento de luxo, é um conceito que tem ganho popularidade nos últimos anos, especialmente entre os viajantes que buscam uma experiência mais autêntica e próxima da natureza, sem abdicarem do conforto e da qualidade. A ideia é proporcionar aos hóspedes uma estada única, com paisagens deslumbrantes, e ainda assim oferecer todas as comodidades esperadas de um hotel de luxo. O presente plano de negócios, denominado de Symbiosis Eco Resort, pretende desenvolver um Glamping na aldeia de Azinhal, concelho de Castro Marim. A localização do empreendimento é num terreno de 20 hectares junto à barragem de Beliche, oferecendo um ambiente natural e tranquilo para os hóspedes desfrutarem. O objetivo é criar um espaço alternativo e sustentável, proporcionando uma experiência única e diferenciada. O presente plano de negócio permitiu um estudo exaustivo do setor e procura avaliar a viabilidade económica e financeira. Para o efeito foi realizada análise de mercado, plano de marketing, plano de recursos humanos, plano de implementação e plano financeiro. A implementação deste plano de negócios carece de um investimento inicial no valor de 1.372.417€, financiado em 100.000€ por capitais próprios e por um empréstimo bancário de 1.308.700€ reembolsável em dez anos. No primeiro ano de atividade, prevê-se um volume de vendas na ordem dos 1.117.341€. Na perspetiva do projeto pré-financiamento, as previsões são de um valor atual líquido (VAL) de 1.568.661€, uma taxa interna de rendibilidade (TIR) de 33,16% e um período de pay back de três anos. Na perspetiva do projeto pós-financiamento, prevê-se um VAL de 98.216€, uma TIR de 29,96% e um período de pay back de cinco anos. Por último, na perspetiva do investidor, o VAL será de 2.924.997€, a TIR de 402,73% e o período de pay back de um ano.
- The Effects of 6-Month Multi-Component Exercise Intervention on Body Composition in Aged Women: A Single-Arm Experimental with Follow-Up StudyPublication . Rodrigues, Filipe; Teixeira, José; Monteiro, António; Forte, PedroMulticomponent exercise programs, which combine multiple modalities such as aerobic exercises, strength training exercises, flexibility exercises, and balance exercises, can help to promote healthy aging and prevent chronic diseases in aged women. Thus, the goal of this study is to examine if a multicomponent exercise program could improve body composition in community-dwelling aged women. A 6-month single-arm quasi-experimental research was conducted using a multicomponent exercise program for older adults. The sample included 38 women with a mean age of 63.50 years (SD = 6.47 years). Body composition and anthropometric measurement was conducted from baseline (T1), after intervention (T2), and follow-Up (T3). In addition, after exercise intervention, a significant difference with moderate to large effects was reported for fat mass [η2p = 0.374, p < 0.001)], bone density [η2p = 0.374, p < 0.05)], percentage of water [η2p = 0.374, p < 0.001)], and a metabolic equivalent task [η2p = 0.374, p < 0.05]. Additionally, a significant large effect size between T1 and T2 was verified. However, body composition indicators seem to decrease below baseline levels after concluding exercise intervention (T3). Muscle mass decreased significantly after exercise intervention and mean scores were lower compared to baseline data (T1). Thus, a positive effect of the multicomponent exercise program on body composition was established in this group of community-dwelling aged women. However, the relative improvement in body fat and muscle mass were lost after the exercise program’s conclusion for values below the baselines. Avoiding detraining periods is, therefore, fundamental to maintaining the normal relative body composition.