Search results for "CRITERION"
showing 10 items of 171 documents
A New Systematic Series of Foil Sections with Parallel Sides
2020
Parallel-sided foil sections are used for centerboards and rudders in sailing dinghy classes and also for struts placed in a fluid flow. The objective of this work is to create a systematic series of parallel-sided sections to be used under different conditions, with an emphasis on the sailing dinghies 470, 420 and Optimist. The loss, and surprisingly the gain, in performance relative to 4-digit NACA sections are also investigated. A 2D Reynolds-averaged Navier&ndash
Model of a Constructive Fuctional Optimization of the Cardan Cross
2015
This paper aims to establish an optimization model using the Ansys program, and taking into account the specific constraints depending on the functional role of the specific area. We present certain calculation parameters applied to the cardanic transmission of the Dacia, this cardanic transmission being considered an optimization model. The entire cardanic transmission was analyzed, resulting that the cardan crosses are parts which are strained the most, and that is why it will be here that the optimization will be focused, in terms of minimizing the Von Mises stress.
Stability analysis of Beck's column over a fractional-order hereditary foundation
2018
This paper considers the case of Beck's column resting on a hereditary bed of independent springpots. The springpot possesses an intermediate rheological behaviour among linear spring and linear dashpot. It is defined by means of couple ( C β , β ) that characterize the material of the element and is ruled by a Caputo's fractional derivative. In this paper, we investigate the critical load of the column under the action of a follower load by means of a novel complex transform that allows to use the Routh–Hurwitz theorem in the complex half-plane for the stability analysis.
Habitat preferences of edible dormouse, Glis glis italicus: implications for the management of arboreal mammals in Mediterranean forests
2015
Research on arboreal mammals living in Mediterranean forests is poor. Molecular research assessed the existence of an evolutionary significant unit in the edible dormouse populations living in south Italy, Sicily and Sardinia, and we decided to investigate the environmental factors capable of explaining its occurrence and abundance in Sicily, for a better management of these populations. We assessed the species habitat preferences by setting 25 large and 25 small nestboxes in five sample areas along an altitudinal gradient of the Madonie Range, and recorded habitat variables, food availability, and demographic data for two years. To obtain synthetic descriptors of the dormice habitat requir…
Injury Evaluation in Teenage Cyclist-Vehicle Crash by Multibody Simulation
2014
Information on impact locations, impact situations and cyclist and pedestrian dynamics in impacts with passenger cars is fundamental for the development of effective solutions to improve cyclist and pedestrian protection. Accidentology research shows that cyclists typically have a higher impact location than the pedestrian, with a larger share of injuries from the windscreen area. Majority of accidents in Palermo, in the last years, happens at urban street (84%) that involve teenager (6.4%). In this paper simulation study captures dynamics and injuries to head and chest for teenager between a generic bicycle and a car model that is suitable for pedestrian or cyclist safety. Multibody simula…
Comparative validity of the OIDP and OHIP-14 in describing the impact of oral health on quality of life in a cross-sectional study performed in Spani…
2010
Objectives: We aimed to compare the utility and validity of two popular socio-dental indicators (OIDP and OHIP- 14) for describing the impact of oral conditions on quality of life applied simultaneously. Study design: We recruited a consecutive sample of 270 healthy Spanish workers visiting the Employment Risk Prevention Centre for a routine medical check-up. OHIP-14 was self-completed before the oral examination and the face to face interview of the OIDP was performed. Both instruments were compared by evaluating its reliability and its validity. Results and Conclusions: The standardised Cronbach alphas for OHIP-14 and OIDP were 0.89 and 0.74 respectively. OIDP showed lower face validity b…
Kihon Checklist to assess frailty in older adults: Some evidence on the internal consistency and validity of the Spanish version
2021
Aim The aim of this study was to assess the internal consistency, hypothesis testing and criterion-related validity of the Spanish versions of the Kihon Checklist (KCL) - the original 25-item and reduced 15-item versions - for screening frailty in community-dwelling older adults. Methods A cross-sectional study was carried out between March and September 2018 in Valencia province (Spain). A sample of 251 participants was recruited. Construct validity was assessed using four different frailty instruments, and alternative measures corresponding to the KCL domains (handgrip strength, gait speed, the Short Physical Performance Battery, skeletal muscle mass index, physical activity level, functi…
Spatial autocorrelation and the selection of simultaneous autoregressive models
2007
Aim Spatial autocorrelation is a frequent phenomenon in ecological data and can affect estimates of model coefficients and inference from statistical models. Here, we test the performance of three different simultaneous autoregressive (SAR) model types (spatial error = SAR err , lagged = SAR lag and mixed = SAR mix ) and common ordinary least squares (OLS) regression when accounting for spatial autocorrelation in species distribution data using four artificial data sets with known (but different) spatial autocorrelation structures. Methods We evaluate the performance of SAR models by examining spatial patterns in model residuals (with correlograms and residual maps), by comparing model para…
Adaptación y estudio de las propiedades psicométricas del Cuestionario de consecuencias de consumo de alcohol en jóvenes, forma breve, en muestra esp…
2020
El objetivo de este trabajo es presentar la adaptación y estudio de las propiedades psicométricas del Cuestionario de consecuencias de consumo de alcohol en jóvenes, forma breve (B-YAACQ) en una muestra de 323 estudiantes de Psicología españoles, de los cuales el 74.3% son mujeres. Se realizó una retro-traducción de los ítems siguiendo las normas de la ITC, y un análisis factorial confirmatorio (AFC) con el programa Mplus mediante el método de extracción WLSMV y la matriz de correlaciones policóricas. El AFC arrojó resultados satisfactorios sobre el modelo unidimensional, con muy buenos indicadores de ajuste. Todas las saturaciones factoriales presentaron valores adecuados y fueron estadíst…
On Grinberg’s Criterion
2019
We generalize Grinberg’s hamiltonicity criterion for planar graphs. To this end, we first prove a technical theorem for embedded graphs. As a special case of a corollary of this theorem we obtain Zaks’ extension of Grinberg’s Criterion (which encompasses earlier work of Gehner and Shimamoto), but the result also implies Grinberg’s formula in its original form in a much broader context. Further implications are a short proof for a slightly strengthened criterion of Lewis bounding the length of a shortest closed walk from below as well as a generalization of a theorem due to Bondy and Häggkvist. See full version of the article: https://www.sciencedirect.com/science/article/pii/S01956698183013…