INSTABILITIES OF INITIALLY STRESSED HYPERELASTIC CYLINDRICAL MEMBRANE AND SHELL UNDER INTERNAL PRESSURE

Summary This paper investigates the static non-linear behaviour and possible instabilities of cylindrical membranes and shells. A detailed experimental analysis was carried out. The structure was analysed using appropriate membrane or shell finite elements and the resulting non-linear equilibrium equations solved using the FE software ABAQUS. A detailed parametric numerical analysis was carried out and the influence of different types of local imperfections was also studied in detail

Postural Control During Cascade Ball Juggling: Effects of Expertise and Base of Support

Cascade ball juggling is a complex perceptual motor skill which requires efficient postural stabilization. The aim of this study was to investigate effects of experience (expert and intermediate groups) and foot distance (wide and narrow stances) on body sway of jugglers during three ball cascade juggling. A total of 10 expert jugglers and 11 intermediate jugglers participated in this study. Participants stood barefoot on the force plate (some participants wore a gaze tracking system), with feet maintained in wide and narrow conditions and performed three 40-seconds trials of the three-ball juggling task. Dependent variables were sway mean velocity, amplitude, mean frequency, number of ball cycles, fixation number, mean duration and its variability, and area of gaze displacement. Two-way analyses of variance with factors for group and condition were conducted. Experts' body sway was characterized by lower velocity and smaller amplitude as compared to intermediate group. Interestingly, the more challenging (narrow) basis of support caused significant attenuation in body sway only for the intermediate group. These data suggest that expertise in cascade juggling was associated with refined postural control.CNPqFAPESPUniv Estadual Paulista UNESP, Dept Phys Educ, Lab Informat Vis & Act, Fac Sci, Bauru, SP, BrazilUniv Fed Sao Paulo, Paulista Sch Med, Dept Informat Hlth, Lab Ocular Bioengn, Sao Paulo, SP, BrazilNewcastle Univ, Inst Neurosci, Movement Lab, Newcastle Upon Tyne, Tyne & Wear, EnglandUniv Estadual Paulista UNESP, Biosci Inst, Dept Phys Educ, Posture & Gait Studies Lab, Rio Claro, SP, BrazilUniv Estadual Paulista UNESP, Dept Phys Educ, Human Movement Res Lab & Lab Informat, Fac Sci, Bauru, SP, BrazilUniv Fed Sao Paulo, Paulista Sch Med, Dept Informat Hlth, Lab Ocular Bioengn, Sao Paulo, SP, BrazilCNPq: 458916/2014-5CNPq: 458775/2014-2CNPq: 205440/2014-2FAPESP: 2014/23963-1FAPESP: 2015/10851-3Web of Scienc

Relação metionina e colina dietética sobre o desempenho de codornas japonesas (Coturnix coturnix japonica) em postura

We evaluated the relationship between levels of methionine and choline on the performance of Japanese quails (Coturnix coturnix japonica) at the production stage, using 432 birds at 65 days of age and weighing 155g, in a completely randomized design in 4x2 (methionine x choline) factorial arrangement with six replicates and nine birds per unit. The levels of choline and methionine were 0, 200, 400 and 600 ppm and 0.65 and 0.75%, respectively. We analyzed the following variables: egg production (% / hen / day), egg weight (g), egg mass (g egg / hen/ day), feed conversion (g / g) and food intake (g / d). We observed a significant interaction for egg production (P ? 0.01) and egg mass (P ? 0.05) with linear effect for 0.65% methionine and inclusion of increasing levels of choline. There was a quadratic effect of choline levels on feed intake, with 0.65% methionine. The use of choline in diets of quail in production only effects bird performance when 0.65% methionine level is used. Supplementation with choline causes an increase in average egg weight regardless of the level of dietary methionine supplementation.KEYWORDS: laying quails; nutrition; nutritional requirements; performance; sulphur amino acids.Avaliou-se a relação entre níveis de metionina e colina sobre o desempenho de codornas japonesas (Coturnix coturnix japonica) na fase de produção, sendo utilizadas 432 aves com 65 dias de idade e peso médio de 155g, num delineamento experimental inteiramente casualizado, em esquema fatorial 4x2 (colina x metionina) com seis repetições e nove aves por unidade experimental. Os níveis de colina e metionina foram de 0; 200; 400 e 600 ppm e 0,65 e 0,75%, respectivamente. Analisaram-se as variáveis: produção de ovos (%/ave/dia), pesos dos ovos (g), massa dos ovos (gramas de ovo/ave/dia), conversão alimentar e consumo alimentar (g/d). Observou-se interação significativa para produção de ovos (P?0,01) e massa de ovos (P?0,05) com efeito linear para o nível de 0,65% de metionina e inclusão crescente de níveis de colina. Ocorreu efeito quadrático dos níveis de colina para consumo de ração, com nível de 0,65% de metionina. A utilização de colina em rações de codornas em produção somente tem efeitos sobre o desempenho das aves quando o nível de metionina utilizado for de 0,65%. A suplementação com colina promove um aumento no peso médio dos ovos independente do nível de suplementação de metionina dietética.PALAVRAS-CHAVE: aminoácido sulfurado; codornas de postura; desempenho; exigência nutricional; nutrição

Synthesis of Functional Fluorescent BODIPY-based Dyes through Electrophilic Aromatic Substitution: Straightforward Approach towards Customized Fluorescent Probes

Contains fulltext : 161531.pdf (publisher's version ) (Open Access

Unsaturated 1,2-amino alcohols and ethers from aziridines and organolithiums.

Organolithium-induced ring-opening of aziridines of 2,5-dihydrofuran (5 and 8) and 1,4-dimethoxybut-2-ene (16, 17 and 23) gives 3-substituted 2-aminobut-3-en-1-ols 9-15 and amino ethers 18-20 and 24-26

Enantioselective alkylative double ring-opening of epoxides derived from cyclic allylic ethers: synthesis of enantioenriched unsaturated diols.

A screen of external chiral ligands has led to enantioselective organolithium-induced alkylative double ring-opening of 3,4-epoxytetrahydrofuran 1 with n-BuLi to give 3-methyleneheptane-1,2-diol 3 in 75% yield and 55% ee in the presence of bisoxazoline 10, and in up to 60% ee in the presence of (-)-sparteine 2. Extending the alkylative double ring-opening reaction to epoxides derived from oxabicyclo[n.2.1]alkenes (n = 2.3) results in the formation of cycloalkenediols, which, when carried out in the presence of (-)-sparteine 2 affords products in up to 85% ee

Organolithium-induced alkylative ring opening of aziridines: synthesis of unsaturated amino alcohols and ethers.

Organolithium-induced alkylative ring opening of N-sulfonyl-protected aziridinyl ethers is described. The reactions were efficiently carried out with a variety of organolithiums, providing a promising new strategy to unsaturated amino alcohols and ethers. Cis- and trans-1,4-dimethoxybut-2-ene-derived aziridines were prepared, and their propensity to undergo organolithium- induced alkylative desymmetrization is detailed. Use of a single enantiomer of the latter aziridine provides a route to enantiopure unsaturated amino ethers

Postural control during cascade ball juggling: Effects of expertise and base of support

Cascade ball juggling is a complex perceptual motor skill which requires efficient postural stabilization. The aim of this study was to investigate effects of experience (expert and intermediate groups) and foot distance (wide and narrow stances) on body sway of jugglers during three ball cascade juggling. A total of 10 expert jugglers and 11 intermediate jugglers participated in this study. Participants stood barefoot on the force plate (some participants wore a gaze tracking system), with feet maintained in wide and narrow conditions and performed three 40-seconds trials of the threeball juggling task. Dependent variables were sway mean velocity, amplitude, mean frequency, number of ball cycles, fixation number, mean duration and its variability, and area of gaze displacement. Two-way analyses of variance with factors for group and condition were conducted. Experts’ body sway was characterized by lower velocity and smaller amplitude as compared to intermediate group. Interestingly, the more challenging (narrow) basis of support caused significant attenuation in body sway only for the intermediate group. These data suggest that expertise in cascade juggling was associated with refined postural control.Univ Estadual Paulista – UNESP Faculty of Sciences Department of Physical Education Laboratory of Information Vision and ActionFederal University of São Paulo Paulista School of Medicine Department of Informatics in Health Laboratory of Ocular BioengineeringNewcastle University Institute of Neuroscience Movement LaboratoryUniv Estadual Paulista – UNESP Biosciences Institute Department of Physical Education Posture and Gait Studies LaboratoryUniv Estadual Paulista – UNESP Faculty of Sciences Department of Physical Education Human Movement Research Laboratory and Laboratory of Information Vision and ActionUniv Estadual Paulista – UNESP Faculty of Sciences Department of Physical Education Laboratory of Information Vision and ActionUniv Estadual Paulista – UNESP Biosciences Institute Department of Physical Education Posture and Gait Studies LaboratoryUniv Estadual Paulista – UNESP Faculty of Sciences Department of Physical Education Human Movement Research Laboratory and Laboratory of Information Vision and Actio