197,307 research outputs found
Experimental investigations of ambiguity: the case of most
No full textIn the study of natural language quantification, much recent attention has been devoted to the investigation of verification procedures associated with the proportional quantifier most. The aim of these studies is to go beyond the traditional characterization of the semantics of most, which is confined to explicating its truth-functional and presuppositional content as well as its combinatorial properties, as these aspects underdetermine the correct analysis of most. The present paper contributes to this effort by presenting new experimental evidence in support of a decompositional analysis of most according to which it is a superlative construction built from a gradable predicate many or much and the superlative operator -est (Hackl, in Nat Lang Semant 17:63–98, 2009). Our evidence comes in the form of verification profiles for sentences like Most of the dots are blue which, we argue, reflect the existence of a superlative reading of most. This notably contrasts with Lidz et al.’s (Nat Lang Semant 19:227–256, 2011) results. To reconcile the two sets of data, we argue, it is necessary to take important differences in task demands into account, which impose limits on the conclusions that can be drawn from these studies
Instantaneous conduction and switching losses in two-level voltage source inverters
No full textA mathematical model is derived which allows to compute instantaneously the conduction and switching losses in two-level voltage source inverters (2L-VSIs) regardless of the employed modulation scheme. The model is based on the use of switching vectors applied to the considered VSI, taking into account the instantaneous conduction and switching losses of the semiconductor devices. The advantages of this method are, (i) it can be extended to any type of VSI and any modulation scheme, (ii) it can be applied to analyze the power losses of VSIs during any desired period, and (iii) it can be easily implemented in any kind of the simulation software (e.g. Matlab/Simulink)
Variational modeling of microstructures in plasticity
No full textThe analysis and simulation of microstructures in solids has gained crucial importance, virtue of the influence of all microstructural characteristics on a material’s macroscopic, mechanical behavior. In particular, the arrangement of dislocations and other lattice defects to particular structures and patterns on the microscale as well as the resultant inhomogeneous distribution of localized strain results in a highly altered stress-strain response. Energetic models predicting the mechanical properties are commonly based on thermodynamic variational principles. Modeling the material response in finite-strain crystal plasticity very often results in a nonconvex variational problem so that the minimizing deformation fields are no longer continuous but exhibit small-scale fluctuations related to probability distributions of deformation gradients to be calculated via energy relaxation. This results in fine structures which can be interpreted as the observed microstructures.
This manuscript is supposed to give an overview of the available methods and results in this field. We start by discussing the underlying variational principles for inelastic materials, derive evolution equations for internal variables, and introduce the concept of condensed energy. As a mathematical prerequisite we review the variational calculus of nonconvex potentials and the notion of relaxation. We use these instruments in order to study the initiation of plastic microstructures. Here we focus on a model of single-slip crystal plasticity. Afterward we move on to model the evolution of microstructures. We introduce the concept of essential microstructures and the corresponding relaxed energies and dissipation potentials, and derive evolution equations for microstructure parameters. We then present a numerical scheme by means of which the microstructure development can be computed, and show numerical results for particular examples in single- and double-slip plasticity. We discuss the influence of hardening and of slip system orientations in the present model
Rate-Independent versus Viscous Evolution of Laminate Microstructures in Finite Crystal Plasticity
No full textIn this chapter we investigate the variational modeling of the evolution of inelastic microstructures by the example of finite crystal plasticity with one active slip system. For this purpose we describe the microstructures by laminates of first order.We propose an analytical partial relaxation of an incompressible neo-Hookean energy formulation, keeping the internal variables and geometric microstructure parameters fixed, thus approximating the relaxed energy by an upper bound of the rank-one-convex hull. Based on the minimization of a Lagrange functional, consisting of the sum of rate of energy and dissipation potential, we derive an incremental strategy to model the time-continuous evolution of the laminate microstructure. Special attention is given to the three distinct cases of microstructure evolution, initiation, rotation, and continuous change. We compare a rate-independent approach with another one that employs viscous regularization which has certain advantages concerning the numerical implementation. Simple shear and tension/compression tests will be shown to demonstrate the differences between both approaches and to show the physical implications of the models introduced
Extended State Observer Based Stator Flux Linkage Estimation of Nonlinear Synchronous Machines
No full textMC VIII SAMOIEDICA 2: JURAK-SAMOIEDICA 1: Line-aligned Ground Truth
No full textMC VIII SAMOIEDICA 2: JURAK-SAMOIEDICA 1: Line-aligned Ground Truth
This dataset contains 172 microfilm scans Tundra Nenets materials, in which the text content is manually aligned line by line with the scanned images. This material has been created in collaboration between the Finno-Ugrian Society and the University of Innsbruck. It is intended specifically for handwritten text recognition experiments, training and benchmarking. For electronic materials and printed volumes that are intended to be used in linguistic, ethnographic and folkloric research, please refer to other publications in this Zenodo collection or [Manuscripta Castreaniana website](https://www.sgr.fi/manuscripta/).
The materials were aligned in the University of Innsbruck with contributions by Günter Mühlberger and Günter Hackl. Other contributors are Karina Lukin and Niko Partanen. [Transkribus](https://readcoop.eu/transkribus/?sc=Transkribus) platform was extensively used in processing this dataset, and the file format is a direct Transkribus image and Page XML export
System Parameter-free Continuous Control-set Predictive Current Control of Synchronous Motors
No full textDr. Duane M. Jackson, Morehouse College, July 2011
No full textThis video is a conversation with Dr. Duane M. Jackson. Dr. Jackson talks about his paper, "Recall and the Serial Position Effect: The Role of Primacy and Recency on Accounting Students' Performance." Jackie Daniel, AUC Woodruff Library, is the interviewer
Functional analysis as a conceptual instrument for studying and developing new farm-implements. An application to the design of a hand-tool for collecting kaki fruits
No full textA novel design-approach for studying and developing new farm-implements or tools is illustrated here, describing the different steps and its main conceptual instrument: the functional analysis (FA). In the present case (concerning the tools for fruit-harvesting), the FA was used to prepare a multidimensional matrix of the technical requirements; the same matrix was then used to classify the current design-requirements, verify any preexisting solution normally present in commercial tools.
The method is therefore applied to a first prototype of a hand-tool for collecting kaki fruits, usable also with very ripe fruits (i.e., ready to be eaten). It has been decided to undertake the design of a tool to harvest kakis due to the remarkable difficulties the picker has usually to face with the manipulation of these particularly-delicate fruits (including the phases of abscission, interception/grasping of fruits and adduction to the operator). The designed tool resulted to be very practical to be used, cheap and effective in ensuring the product integrity during the harvesting
- …
