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Barros Mariana Silva,Silva Paula Fernanda Damasceno,Santana Márcia Luciana Carregosa,Bragança Rafaella Mariana Fontes,Faria-e-Silva André Luis 대한치과보존학회 2023 Restorative Dentistry & Endodontics Vol.48 No.1
Objectives This study aimed to evaluate the surrounding and underlying shades’ effect on the color adjustment potential (CAP) of a single-shade composite used in a thin layer. Materials and Methods Cylinder specimens (1.0 mm thick) were built with the Vittra APS Unique composite, surrounded (dual specimens) or not (simple specimens) by a control composite (shade A1, A2, or A3). Simple specimens were also built only with the control composites. Each specimen’s color was measured against white and black backgrounds or the simple control specimens with a spectrophotometer (CIELAB system). The whiteness index for dentistry (WID) and translucency parameters (TP00) were calculated for simple specimens. Differences (ΔE00) in color between the simple/dual specimens and the controls were calculated. The CAP was calculated based on the ratios between data from simple and dual specimens. Results The Vittra APS Unique composite showed higher WID and TP00 values than the controls. The highest values of ΔE00 were observed among simple specimens. The color measurements of Vittra APS Unique (simple or dual) against the control specimens presented the lowest color differences. Only surrounding the single-shade composite with a shaded composite barely impacted the ΔE00. The highest CAP values were obtained using a shaded composite under simple or dual specimens. Conclusions The CAP of Vittra APS Unique was strongly affected by the underlying shade, while surrounding this composite with a shaded one barely affected its color adjustment.
Mariana Hwang 한국기독교교육정보학회 2005 Journal of Christian education information tech Vol.0 No.7
This study investigatesthe effect of a positive God-concept on the development of a positive self-concept from the perspective of Christian education. A number of studies have recognized that an individual's positive self-concept, as well as a positive God-concept, is positively related to his or her spiritual growth. In fact, several studies have claimed that an individual's positive self-concept is one of the critical factors for the individual to develop a positive God-concept, which in turn helps to develop spiritual growth. However, contrary to those previous studies, this study proposes that an individual's positive God-concept may lead to the development of a positive self-concept. This qualitative study used a narrative research method to collect data from a sample of 24 Korean-American children (12 boys and 12 girls), ages ranging from 9-11, who have been attending church during the last five years with their parents.Thirteen out of the twenty-four children attend their churches with their parents regularly (twice or more a month), and the other eleven children attend their churches once or less a month with their parents. These children were asked to narrate their ideas and experiences based on the interview questions. This study revealed that a positive relationship exists between the children's self-concepts and their God-concepts. The study also showed that the children's positive God-concept is one of the influential factors for the development of the children's positive self-concept. Moreover, one of the most important findings of this study is that the children's God-conceptscan be changed through what they learn from their Christian educators at church. In summary, this study reflects the importance of the role of a faith community, church and home, and the importance of the role of Christian educators in their influence upon children's construction of God-concepts and self-concepts.
Optimization of a four-bar mechanism cyclic pitch control for a vertical axis wind turbine
Mariana Montenegro-Montero,Gustavo Richmond-Navarro,Pedro Casanova-Tret 한국풍공학회 2022 Wind and Structures, An International Journal (WAS Vol.35 No.2
In this paper, the issue of pitch control in a vertical axis wind turbine was tackled. Programming the Actuator Cylinder model in MATLAB, a theoretical optimum pitch solution was found and then a classic four-bar mechanism was adapted to that theoretical solution to achieve a simple and elegant control of the pitch in the turbine. A simulation using the mechanism worked to find the optimum pitch cycles, where it was found that the mechanism would, in fact, increase the efficiency of the VAWT, by at least 11% and in the best case, over 35%. Another aspect that is studied is the possibility of selfstart of the turbine by only changing the pitch on the blades. This analysis, however, proved that a further individual pitch control must be used to surpass the cogging torque. All analyses conducted were done for a specific wind turbine that is 2 m2 in the swept area.
Mariana TSANEVA 조선대학교 지식경영연구원 2013 기업과 혁신연구 Vol.6 No.2
A comparative study has been done in attempt to evaluate some of the major properties of weighted mixtures of distributions and their predictive ability for risk management purposes. The process of constructing weighted sums of normal distributions has been demonstrated starting from the properties of the most common distributions, continuing with problems that lead to combining individual distributions in mixtures, and finishing with analysis of the predictive ability of two different brands of mixtures: arithmetic and weighted sum of normal distributions. The models was applied to three sets of economic data for South Korea. The estimation of predictive ability in these cases was based on their discrimination ability. The results obtained after performing linear discriminant analysis show better accuracy (between 0.28% and 9.5%) of the weighted sums of normal distributions than the one of the arithmetic sums.
Mariana Nikolova,Gabriela Ambrozova,Maria Kratchanova,Petko Denev,Veselin Kussovski,Milan Ciz,Antonin Lojek 한국식품영양과학회 2013 Journal of medicinal food Vol.16 No.8
The current survey investigates the effect of four polysaccharides isolated from fresh leek or alcohol insoluble substances (AIS) of leek on the production of reactive oxygen species (ROS) and reactive nitrogen species (RNS) from phagocytes. The ability of the polysaccharides to activate serum complement was also investigated. Despite the lack of antioxidant activity, the pectic polysaccharides significantly decreased the production of ROS by human neutrophils. Polysaccharides isolated from AIS markedly activated RAW 264.7 macrophages for RNS production in a concentration-dependent manner. The Western blot analysis revealed that this effect was due to the stimulation of the inducible nitric oxide synthase protein expression of macrophages. The polysaccharides extracted from AIS with water showed the ability to fix serum complement, especially through the alternative pathway. It was found that the polysaccharide that has the highest complement-fixing effect is characterized by the highest content of uronic acids and the highest molecular weight.
Mariana Appel Hort,Elke Zuleika Schuldt,ˆ ngela Cristina Bet,Silvia DalBo,Jarbas Mota Siqueira,,Carla Ianssen,Fa´tima Abatepaulo,Heraldo Possolo de Souza,Beatriz Veleirinho,Marcelo Maraschin,Rosa Mari 한국식품영양과학회 2012 Journal of medicinal food Vol.15 No.10
Moderate wine intake (i.e., 1–2 glasses of wine a day) is associated with a reduced risk of morbidity and mortality from cardiovascular disease. The aim of this study was to evaluate the anti-atherosclerotic effects of a nonalcoholic ethyl acetate fraction (EAF) from a South Brazilian red wine obtained from Vitis labrusca grapes. Experiments were carried out on low-density lipoprotein (LDL) receptor knockout (LDLr−/−) mice, which were subjected to a hypercholesterolemic diet and treated with doses of EAF (3, 10, and 30 mg/kg) for 12 weeks. At the end of the treatment, the level of plasma lipids, the vascular reactivity, and the atherosclerotic lesions were evaluated. Our results demonstrated that the treatment with EAF at 3 mg/kg significantly decreased total cholesterol, triglycerides, and LDL plus very low-density lipoprotein levels compared with control hypercholesterolemic mice. The treatment of mice with EAF at 3 mg/kg also preserved the vasodilatation induced by acetylcholine on isolated thoracic aorta from hypercholesterolemic LDLr−/− mice. This result is in agreement with the degree of lipid deposit on arteries. Taken together, the results show for the first time that the lowest concentration of an EAF obtained from a red wine produced in southern Brazil significantly reduced the progression of atherosclerosis in mice.
Continuous-Discontinuous Model for Ductile Fracture
Mariana R. R. Seabra,Jose M. A. Cesar de Sa 한국소성가공학회 2010 기타자료 Vol.2010 No.6
In this contribution, a continuum-dicontinuum model for ductile failure is presented. The degradation of material properties trough deformation is described by Continuum Damage Mechanics in a non-local integral formulation to avoid mesh dependence. In the final stage of failure, the damaged zone is replaced by a cohesive macro crack and subsequent traction-free macro crack for a more realistic representation of the phenomenon. The inclusion of the discontinuity surfaces is performed by the XFEM and Level Set Method and avoids the spurious damage growth typical of this class of models.
Modelling and Optimisation of Up-and Down-Milling Processes for a Representative Pocket Feature
Mariana Dotcheva,Krassimir Dotchev,Ivan Popov 한국정밀공학회 2013 International Journal of Precision Engineering and Vol. No.
This paper presents the specifics of the two types of end-milling, up- and down-milling, in the context of process planning of a finishing operation for machining complex pocket features. An optimisation mechanism is used for a pocket type of end-milling operation with the aim of comparing the results from up- and down-milling. Two sets of cutting conditions have been generated and analysed for each type of end-milling- one with constant parameters for the entire tool path, derived from the worst case of cutting (representing the usual process planning approach) and another set representing the optimised process. The predicted results were verified through experiments. The optimized cutting parameters, when machining the critical corner, demonstrate the important changes in magnitude and direction of the radial cutting-tool deviation and surface error.