Search results for "Focus"
showing 10 items of 1181 documents
Tolerance to rotation of toric monofocal and bifocal intraocular lenses. A theoretical study
2018
Abstract This manuscript aims to evaluate the tolerance to rotation of a toric monofocal and a toric bifocal intraocular lenses with different cylinder powers. Theoretical designs based on wavefront aberrations were created to simulate a toric monofocal and a toric bifocal intraocular lens. Cylinder power ranged from −1 D to −6 D, in steps of −1 D. Tolerance to rotation was estimated by the visual Strehl ratio based on the optical transfer function (VSOTF) metric. Tolerance to rotation for both monofocal and bifocal intraocular lenses decreased when the cylinder power increased. For the bifocal design studied, the tolerance to rotation was larger for the near focus than for the far, however…
Determination of cow’s milk in non-bovine and mixed cheeses by capillary electrophoresis of whey proteins in acidic isoelectric buffers
2000
An improved method for the determination of cow's milk in non-bovine cheese is reported: electrophoresis of whey proteins in acidic, isoelectric buffers. Two background electrolytes (BGEs) have been tested: (i) 50 mM iminodiacetic acid (pH=isoelectric point=2.30 at 25 degrees C), 0.5% hydroxyethylcellulose, 0.1% Tween 20 and 6 M urea (apparent pH 3.1), E=300 V/cm, for the separation of alpha-lactalbumins (alpha-LAs); (ii) a BGE with the same composition, but supplemented with 10% Tween 20, E=450 V/cm, for the fractionation of beta-lactoglobulins (beta-LGs). Surfactants have a discriminating effect on the retention behaviour of the bovine alpha-LA and beta-LG proteins, owing to the different…
Study of product repositioning for the Marsala Vergine DOC wine
2017
Italian production of wine is very diversified and Sicily is one of the major regions with regards to quality and quantity of wine. The Marsala is the oldest fortified Sicilian wine, which is very valuable because of its organoleptic qualities and its production process. Marsala wine has been gaining for over a century in the Italian and foreign market, but, after a century of fame, it entered a long phase of decline because of inappropriate producers' decisions and new competitors. The objective of this study is to investigate strengths, weaknesses, opportunities and treats of Marsala Vergine DOC wine for repositioning the product in the market. The focus group and factor analysis were car…
A probabilistic approach to radiant field modeling in dense particulate systems
2016
Radiant field distribution is an important modeling issue in many systems of practical interest, such as photo-bioreactors for algae growth and heterogeneous photo-catalytic reactors for water detoxification.In this work, a simple radiant field model suitable for dispersed systems showing particle size distributions, is proposed for both dilute and dense two-phase systems. Its main features are: (i) only physical, independently assessable parameters are involved and (ii) its simplicity allows a closed form solution, which makes it suitable for inclusion in a complete photo-reactor model, where also kinetic and fluid dynamic sub-models play a role. A similar model can be derived by making us…
Puhekaverina botti
2020
Viestivät tekoälyt eli luonnollisella kielellä käytävään keskusteluun kykenevät algoritmit ovat yhä tyypillisempiä vuorovaikutuskumppaneita erilaisilla teknologisilla alustoilla. Yksi tyypillinen viestivän tekoälyn muoto on botti: automaattinen ohjelma, joka käyttää verkkopalvelun käyttäjätiliä tavallisen käyttäjän tavoin ja suorittaa yksinkertaisia toimintoja tai viestii. Tyypillisesti botit tavalla tai toisella pyrkivät näyttäytymään ihmiskäyttäjinä, tai ainakin niille ohjelmoidaan ja suunnitellaan ihmisenkaltaisia piirteitä.Artikkeli tarkastelee bottien roolia vuorovaikutuskumppaneina sisäisessä ja julkisessa mediatilassa kytkeytymällä tuoreeseen ihmis-koneviestinnän tutkimusalaan. Keski…
Aspects Regarding the Modelling of Geometric and Strength Calculations of Worm Gears Using CAD Applications
2020
The new processes of plastic deformation of the gears eliminate some of the shortcomings of the old methods of their manufacture, while reducing the production costs and the time of production in series. This scientific paper addresses the issue of worm gears. The focus has been on geometric and strength calculations for this type of gear, using different CAD applications. The use of these applications substantially reduces the time before the actual development of the processing activities, as well as the early encounter of possible problems.
The teaching of the Valencian language and linguistic prejudices. A case study in a secondary school in Plana Utiel-Requena
2020
[EN] The present research deals with the question of the teaching of Valencian in the Spanish-speaking areas where the LUEV (1983) is in force, which determines the possibility of exemption from the subject of Valencian. Specifically, we approach the question of the beliefs and social representations on the language and its teaching from a case study carried out in a secondary school of the city of Requena. The aim of the study is to identify and differentiate the linguistic attitudes towards the Valencian language in this sociolinguistic context and it is an opportunity to present an educational change. The results of this study respond to the ideas of the students and the native teachers …
Rotation Forms and Local Hamiltonian Monodromy
2017
International audience; The monodromy of torus bundles associated with completely integrable systems can be computed using geometric techniques (constructing homology cycles) or analytic arguments (computing discontinuities of abelian integrals). In this article, we give a general approach to the computation of monodromy that resembles the analytical one, reducing the problem to the computation of residues of polar 1-forms. We apply our technique to three celebrated examples of systems with monodromy (the champagne bottle, the spherical pendulum, the hydrogen atom) and to the case of non-degenerate focus-focus singularities, re-obtaining the classical results. An advantage of this approach …
Energy minimization of single input orbit transfer by averaging and continuation
2006
AbstractThis article deals with the transfer between Keplerian coplanar orbits using low propulsion. We focus on the energy minimization problem and compute the averaged system, proving integrability and relating the corresponding trajectories to a three-dimensional Riemannian problem that is analyzed in details. The geodesics provide approximations of the extremals of the energy minimization problem and can be used in order to evaluate the optimal trajectories of the time optimal and the minimization of the consumption problems with continuation methods. In particular, minimizing trajectories for transfer towards the geostationary orbit can be approximated in suitable coordinates by straig…
Probability and algorithmics: a focus on some recent developments
2017
Jean-François Coeurjolly, Adeline Leclercq-Samson Eds.; International audience; This article presents different recent theoretical results illustrating the interactions between probability and algorithmics. These contributions deal with various topics: cellular automata and calculability, variable length Markov chains and persistent random walks, perfect sampling via coupling from the past. All of them involve discrete dynamics on complex random structures.; Cet article présente différents résultats récents de nature théorique illustrant les interactions entre probabilités et algorithmique. Ces contributions traitent de sujets variés : automates cellulaires et calculabilité, chaînes de Mark…