861 research outputs found
Bayes and maximum likelihood for L^1-Wasserstein deconvolution of Laplace mixtures
No full textWe consider the problem of recovering a distribution function on the real line from observations additively contaminated with errors following the standard Laplace distribution. Assuming that the latent distribution is completely unknown leads to a nonparametric deconvolution problem. We begin by studying the rates of convergence relative to the -norm and the Hellinger metric for the direct problem of estimating the sampling density, which is a mixture of Laplace densities with a possibly unbounded set of locations: the rate of convergence for the Bayes' density estimator corresponding to a Dirichlet process prior over the space of all mixing distributions on the real line matches, up to a logarithmic factor, with the rate for the maximum likelihood estimator. Then, appealing to an inversion inequality translating the -norm and the Hellinger distance between general kernel mixtures, with a kernel density having polynomially decaying Fourier transform, into any -Wasserstein distance, , between the corresponding mixing distributions, provided their Laplace transforms are finite in some neighborhood of zero, we derive the rates of convergence in the -Wasserstein metric for the Bayes' and maximum likelihood estimators of the mixing distribution. Merging in the -Wasserstein distance between Bayes and maximum likelihood follows as a by-product, along with an assessment on the stochastic order of the discrepancy between the two estimation procedures
Le tournant fictionnel de la traduction au service de la visibilité du traducteur
No full textThis article deals with a case study belonging to what has been called the “fictional turn” in translation studies, that is the approach of fictional representations of translators or interpreters in literature and cinema. This perspective contributes to the visibility of translator and can shed new light on some theoretical issues about translation, especially when the author of the fiction is a practising translator
Posterior rates of convergence for Dirichlet mixtures of exponential power densities
No full textA Dirichlet mixture of exponential power distributions, as a prior on densities supported on the real line in the problem of Bayesian density estimation, is a natural generalization of a Dirichlet mixture of normals, which has been shown to possess good frequentist asymptotic properties in terms of posterior consistency and rates of convergence. In this article, we establish upper bounds on the rates of convergence for the posterior distribution of a Dirichlet mixture of exponential power densities, assuming that the true density has the same form as the model. When the kernel is analytic and the mixing distribution has either compact support or sub-exponential tails, a nearly parametric rate, up to a logarithmic factor whose exponent depends on the tail behaviour of the base measure of the Dirichlet process and the exponential decay rate at zero of the prior for the scale parameter, is obtained. The result covers the important special case where the true density is a location mixture of normals and shows that a nearly parametric rate arises also when the prior on the scale contains zero in its support, provided it has a sufficiently fast decay rate at zero. This improves on some recent results on density estimation with Dirichlet mixtures of normals by allowing the inverse-gamma distribution, which is a commonly used prior on the square of the bandwidth. When the kernel is not infinitely differentiable at zero, as the case may be depending on the shape parameter, the posterior distribution is shown to concentrate around the sampling density at a slower rate
CATIA V5 macro programming: with Visual Basic Script
No full textCATIA V5 Macro Programming with Visual Basic Script shows you, step by step, how to create your own macros that automate repetitive tasks, accelerate design procedures, and automatically generate complex geometries. Filled with full-color screenshots and illustrations, this practical guide walks you through the entire process of writing, storing, and executing reusable macros for CATIA® V5. Sample Visual Basic Script code accompanies the book’s hands-on exercises and real-world case studies demonstrate key concepts and best practices
CATIA-BASED BIM TECHNOLOGY IN HIGHWAY TUNNEL DESIGN
No full textto CATIA’s ‘assemblies + parts’ modeling method, CATIA based BIM (Building Information Modeling) technology has been proposed for highway tunnel design in this paper. A tunnel BIM is created by CATIA, which is based on a real case in China, focusing on the following 3 aspects: (1) Creating tunnel bolts by UDF + Loop cyclic arrangement method; (2) Using Sketch Tracer module to create tunnel portal; (3) Parameter is used to create and call the Catalog database. Then, bolt collision inspection and U shaped groove concrete statistics are conducted with the help of the tunnel BIM created. Finally, the finite element analysis of tunnel construction process is carried out through the CATIA Midas interface. The results demonstrate that the CATIAbased BIM technology can well adapt to the characteristics of tunnel and have well potential applications in tunnel design
Coping with Iberian monopolies: Genoese trade networks and formal institutions in Spain and Portugal during the second half of the eighteenth century
No full textThis article explores Genoese trade interests in Cadiz and Lisbon, the two capitals of Iberian colonial trade at the end of the early-modern period. The author aims to explain the persisting intermediary role of a merchant community that has been largely overlooked by historians. The structure of the trade networks established in the two cities will be reconstructed by using the primary sources conserved in the archive of the Durazzos, a powerful aristocratic family of the Republic which has left a unique collection of private correspondence. This sizeable and largely unexplored documentation illuminates the different strategies used to access the Spanish and Portuguese monopolistic systems, the main actors who traded in both contexts, their relations with the local elite, and the nature of the business networks linking Genoese investors in the mother city with the expatriated agents. The author concludes with a comparative analysis of the institutional resources that Genoese used to maintain their interests, with particular attention paid to the religious institutions established by the 'nation' in the two port cities
Modeling of helicopter blades flapping in CATIA V5
No full textZjawisko drgań układów mechanicznych jest istotnym problemem w projektowaniu części maszyn i mechanizmów. Szczególne ważne jest to w urządzeniach takich ja śmigłowce, w których nie można sobie pozwolić na awarię. Za pomocą modułów DMU Kinematics oraz Knownage Advisor w systemie Catia V5 został stworzony model drgań łopaty wirnika nośnego śmigłowca w układzie klasycznym. W tym modelu zostały odtworzone więzy kinematyczne występujące na rzeczywistym obiekcie oraz dodany opis równań ruchu łopaty w trzech kierunkach, to jest w płaszczyźnie ciągu, obrotów i przekręceń. Model ten pozwala na analizę zachowania się łopat przy różnych wymuszeniach, analizę maksymalnych wychyleń od położenia neutralnego oraz zbadanie zachowania się układu przy różnych wymiarach części składowych mechanizmu.In this publication presents virtual vibration model of helicopter main rotor blade, created in modules DMU Kinematics and Knownage Advisor in Catia V5 system. In this model create all kinematic joints based on real object. This method of modeling allow to analyzing blade vibration with parameters of motion defined by user
Micro-impedance cytometry
No full textElectrical impedance spectroscopy is a non-invasive and label free technique that allows for rapid counting and characterisation of particles in suspension based on their response to applied AC potentials. In recent years, lab-on-a-chip technologies have been developed to enable single-cell impedance detection and a wide range of impedance-based microfluidic devices have been reported. Despite the number of contributions and the achievements of this field, micro-impedance cytometry still suffers from a lack of sensitivity and specificity compared to traditional flow cytometry, which limits the potential commercialization of microfluidic impedance devices. While impedance measurements of beads and cells are well established, discrimination between particles that are very similar in size or detection of small particles (around 1 ?m in diameter) such as bacteria, still represents a difficult task. A number of issues limit the sensitivity and specificity of these microfluidic systems. Primarily, the sensitivity is governed by the dimension of the sample analysis volume. A small volume gives a high sensitivity, but this can lead to practical problems, including fabrication and clogging of the device. In addition, the spatial location of each particle needs to be controlled accurately within the field. Therefore, an efficient and accurate method for focussing the particles in the centre of the electric field is important. In this thesis, a micro-impedance cytometer for the detection of small particles and bacteria and for the discrimination of particles that are very similar in size is presented. The device consists of a microfluidic channel where two pairs of microfabricated electrodes are provided to perform differential measurements of single particles in suspension at high speed. Different electrode configurations and different techniques for focussing the sample within the detection region of the device are investigated in order to improve the sensitivity of the system without reducing the dimensions of the microfluidic channel. Detection at a volume ratio of particle to an estimated sensing volume of 0.007% and discrimination of 1 ?m and 2 ?m diameter polystyrene beads and E. coli are demonstrated. The micro-impedance cytometer is also proven to be a reliable and effective system to investigate and determine the unknown dielectric properties of particles in suspension, such as polyelectrolyte microcapsule
Reverse Engineering Design and Inspection standards of precision components with free form surfaces using 3D-CAD software CATIA
No full text80 σ.Η διπλωματική εργασία παρουσιάζει όλα τα εργαλεία και δυνατότητες του σχεδιαστικού πακέτου CATIA ως μια ακόμη εναλλακτική και αξιόπιστη λύση σε προβλήματα αντίστροφου μηχανολογικού σχεδιασμού. Μέσα από εφαρμογές παρουσιάζονται και χρησιμοποιούνται μια πλειάδα από εντολές ακολουθώντας όλα τα βήματα και στάδια του αντίστροφου σχεδιασμού μέχρι να προκύψει το τελικό τρισδιάστατο αντικείμενο. Επιπλέον, το τελικό ψηφιακό αντικείμενο αναλύεται διεξοδικά και ελέγχεται σε ποιο βαθμό προσεγγίζει το πραγματικό αντικείμενο.This dissertation paper is presenting all the tools and potential of the design package CATIA as an alternative and reliable solution to problems concerning reverse design. Through the application of CATIA a number of instructions that follow all the steps of reverse design are followed until the final 3D object is created. Furthermore, the final digital object is analyzed thoroughly and verifies to what extend it resembles the real object.Χριστόφορος Κ. Όξινο
Construction of solid end-milling cutter in SW CATIA V5
No full textBakalářská práce obsahuje metodický popis konstrukce frézy v Catii a základní popis konstrukčních prvků používaných na frézách. Modelování frézy je uzpůsobeno ke skutečné tvorbě frézy v praxi. Práce by měla sloužit katedře KTO v rámci předmětu KCN.Katedra technologie obráběníObhájenoThe bachelor´s work contains a methodical description of milling cutter design in Catia and an elementary description of design elements used on milling cutter.
Modelling of the milling cutter is adjusted to the real milling cutter production in reality. This work should be dedicated to the Department of Machining Technology under the terms of subject Cutting Tool and Fixture Design
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