Search results for "Wing"

A Proposal to Model Ancient Silk Weaving Techniques and Extracting Information from Digital Imagery - Ongoing Results of the SILKNOW Project

2019

Three dimensional (3D) virtual representations of the internal structure of textiles are of interest for a variety of purposes related to fashion, industry, education or other areas. The modeling of ancient weaving techniques is relevant to understand and preserve our heritage, both tangible and intangible. However, ancient techniques cannot be reproduced with standard approaches, which usually are aligned with the characteristics of modern, mechanical looms. The aim of this paper is to propose a mathematical modelling of ancient weaving techniques by means of matrices in order to be easily mapped to a virtual 3D representation. The work focuses on ancient silk textiles, ranging from the 15…

Attraversare

2016

L'articolo propone alcune riflessioni sul concetto di "attraversamento dell'architettura" tramite l'implicazione delle arti visuali e del teatro danza. In particolare, è stata approfondito tale concetto realizzando un "attraversamento" della concatenazione spaziale di Palazzo Riso, Museo d'Arte Contemporanea di Palermo, filtrando lo spazio con la scansione temporale della danza. La performance di teatro danza prende avvio in un precedente momento architettonico, cioè nella Piazza Bologni, che costituisce una delle due estremità del percorso teatrale-spaziale. La piazza costituisce il momento della riflessione, dall'esterno verso l’interno, di una serie di avvenimenti attraverso i quali pren…

2018

Abstract. In situ cloud observations at mountain-top research stations regularly measure ice crystal number concentrations (ICNCs) orders of magnitudes higher than expected from measurements of ice nucleating particle (INP) concentrations. Thus, several studies suggest that mountain-top in situ cloud microphysical measurements are influenced by surface processes, e.g., blowing snow, hoar frost or riming on snow-covered trees, rocks and the snow surface. This limits the relevance of such measurements for the study of microphysical properties and processes in free-floating clouds. This study assesses the impact of surface processes on in situ cloud observations at the Sonnblick Observatory in…

Surface finish generated in hard turning of quenched alloy steel parts using conventional and wiper ceramic inserts

2006

Abstract Significant progress has already been achieved in green manufacturing including dry and hard, often high-speed, machining technologies. For instance, the demand for higher productivity has resulted in the wider application of ceramic and PCBN tools with special multi-radii (wiper) geometry. This paper reports some important characteristics of the surface roughness produced in the turning of a hardened low-chromium alloy steel using mixed alumina–titanium carbon (TiC) ceramic cutting tools equipped with both conventional and wiper inserts. The characteristic geometrical features of surfaces obtained in both these turning operations have been assessed by means of representative two-d…

Parametric Design of Sailing Hull Shapes

2006

The author presents an original algorithm aimed at automatically generating the hull shape of a sailing yacht starting from an initial set of parameters. The procedure consists of two steps. First one keel line and a Designed Water Line (DWL in the following) are faired according to a set of parameters, say length of water line, canoe body draft, stem angle and some adimensional coefficients. This information is then used to fair the hull surface, which must in turn fulfil more prerequisites (parameters like displaty cement, floatation area and related coefficients). The hull is defined by means of a B-spline surface, the fairing of which is ensured by allowing for all the imposed objective…

An Automatic Three-Dimensional Fuzzy Edge Detector

2009

Three-dimensional object analysis is of particular interest in many research fields. In this context, the most common data representation is boundary mesh, namely, 2D surface embedded in 3D space. We will investigate the problem of 3D edge extraction, that is, salient surface regions characterized by high flexure. Our automatic edge detection method assigns a value, proportional to the local bending of the surface, to the elements of the mesh. Moreover, a proper scanning window, centered on each element, is used to discriminate between smooth zones of the surface and its edges. The algorithm does not require input parameters and returns a set of elements that represent the salient features …

Documentación gráfica de la Iglesia de Santa Águeda en Sotillo de la Ribera (España)

2014

The parochial church of Santa Águeda in Sotillo de la Ribera, located in the province of Burgos, Spain is the object of the works of graphical documentation using different methods of survey, which provide a material with different levels of precision, here analysed and confronted. The value of documentation of buildings never surveyed before, enables a much more thorough formal analysis and offers the possibility of contrasting cases with similar features within the territory. The supplementary value added by the knowledge of measures of ancient architectures means a useful tool for their study and, along with formal and historic studies supplies enough elements to obtain a revalorization …

Towards Municipal Environmental Development: Environmental Management Systems for Local Formal Education Establishments

2021

Educational institutions create certain environmental impacts in their operation – these impacts can be grouped into the sectors of waste, water, energy, transport and others. There is a need for educational institutions to adopt effective environmental management systems in order to reduce these impacts, as well as those of the whole municipality. The Eco-Schools programme is one of the most comprehensive and popular models of environmental education and management in the world. In recent years, the Eco-Schools programme has proved its effectiveness in numerous evaluations in several countries. The programme aims to raise awareness about environmental issues. Therefore, this programme enco…

Interspecific aggression and character displacement in the damselfly Calopteryx splendens

2004

Problems in species recognition are thought to affect the evolution of secondary sexual characters mainly through avoidance of maladaptive hybridization. Another, but much less studied avenue for the evolution of sexual characters due to species recognition problems is through interspecific aggression. In the damselfly, Calopteryx splendens, males have pigmented wing spots as a sexual character. Large-spotted males resemble males of another species, Calopteryx virgo, causing potential problems in species recognition. In this study, we investigate whether there is character displacement in wing spot size and whether interspecific aggression could cause this pattern. We found first that wing …

Morphological variation and the recent evolution of wing length in the icterine Warbler: A case of unidirectional introgression?

1999

Icterine Warbler Hippolais icterina and Melodious Warbler H. polyglotta are closely related species with parapatric breeding ranges. Their breeding ranges overlap only in a narrow zone in western Europe, where the Icterine Warbler population is presently declining and the Melodious Warbler population expanding. In eastern Burgundy (France), both species have bred in sympatry for at least forty years, but the Icterine Warbler started to decline in the mid-seventies. The two species differ in wing length and wing formula. Morphological variations of the wing were compared for the Icterine Warbler population in eastern Burgundy between 1965/76 and 1985/96. In the second period, wing length and…