Modeling assimilation

2018 ◽  
pp. 241-275
Author(s):  
Rebeka Campos-Astorkiza
Keyword(s):  
Experimental Results ◽  
Articulatory Phonology ◽  
Acoustic Data ◽  
Recent Developments ◽  
Central Argument

This chapter discusses recent developments in the study of voicing assimilation as manifested in Spanish preconsonantal sibilants. It uses experimental results to develop a model to capture the observed patterns and make predictions about the behavior of voicing assimilation in Spanish. The central argument is that voicing assimilation in Spanish is the result of gestural blending at the laryngeal level and can be couched within the framework of Articulatory Phonology. The main evidence for the gestural blending account comes from a review of the data available on the topic and, more precisely, from the reanalysis of the data from two experiments run by Rebeka Campos-Astorkiza that provide acoustic data to substantiate the claims put forward here. Furthermore, these experiments allow the evaluation of some of the challenges of working with acoustic data when analyzing voicing assimilation.

Preliminary Design of Variable Nozzle Turbines Based on Sensitive Parameters

2020 ◽  
Author(s):  
Sebastian Wittwer ◽  
Ivo Sandor
Keyword(s):  
Engine Performance ◽  
Optimal Solution ◽  
Operating Conditions ◽  
Experimental Results ◽  
Preliminary Design ◽  
Component Level ◽  
Gasoline Engines ◽  
Functional Parameters ◽  
Predictive Quality ◽  
Recent Developments

Abstract Recent developments in turbocharged gasoline engines have established new requirements for the turbine. A simple approach of scaling or optimizing existing turbines on component level might not be sufficient in terms of finding an optimal solution according to the multi-point, multi-disciplinary layout target. In the following paper nondimensional functional parameters are derived from turbomachinery analytics and rated on corresponding values of existing turbine stages. The influence of different parameters on aerodynamic performance is discussed based on CFD results and arranged according to their sensitivity for different engine relevant operating conditions. A metamodel for the preliminary design of variable nozzle turbine stages is derived from DoE (Design of Experiments) based CFD results. It is evaluated regarding its predictive quality on several exemplary turbine stages. Both, CFD and experimental results are therefore used while the experimental results are made up of hot gas stand measurements as well as measurements on engine test bench. Thus, not only the influence of functional parameters can be verified on turbine efficiency characteristics, but beyond that also the predictive quality of engine performance can be assessed.

scholarly journals Wavefront correction with a ferrofluid deformable mirror: experimental results and recent developments

2008 ◽  
Author(s):  
Denis Brousseau ◽  
Ermanno F. Borra ◽  
Simon Thibault ◽  
Anna M. Ritcey ◽  
Jocelyn Parent ◽  
...  
Keyword(s):  
Experimental Results ◽  
Deformable Mirror ◽  
Wavefront Correction ◽  
Recent Developments

Progress in Gas-Side Fouling of Heat-Transfer Surfaces

1990 ◽  
Vol 43 (3) ◽  
pp. 35-66 ◽  
Author(s):  
W. J. Marner
Keyword(s):  
Heat Transfer ◽  
Pressure Drop ◽  
Experimental Studies ◽  
Heat Transfer Surface ◽  
Experimental Results ◽  
Considerable Progress ◽  
Insulating Layer ◽  
The Past ◽  
Measuring Devices ◽  
Recent Developments

The purpose of this paper is to present a review of recent developments in gas-side fouling, which may be defined as the deposition of an insulating layer of material onto a heat-transfer surface in the presence of a dirty gas stream. Four major topics are covered in the review: (a) Recent reviews involving various aspects of gas-side fouling, (b) Gas-side fouling mechanisms with special emphasis on transport to the surface, (c) Analytical studies including deposition, heat transfer, and pressure drop models, and (d) Experimental studies including gas-side fouling measuring devices and experimental results. Although the review focuses on work carried out during the past 10–15 years, a number of earlier contributions to the gas-side fouling literature are also included. Gas-side fouling is an extremely complex, multifaceted phenomenon and although considerable progress in this area has been made through the years, it is clear that much work remains to be done.

Recent Developments in Gradient Plasticity—Part I: Formulation and Size Effects

2002 ◽  
Vol 124 (3) ◽  
pp. 352-357 ◽  
Author(s):  
Ioannis Tsagrakis ◽  
Elias C. Aifantis
Keyword(s):  
Shear Band ◽  
Wavelet Analysis ◽  
Constitutive Equations ◽  
Size Effects ◽  
Dislocation Dynamics ◽  
Experimental Results ◽  
Current Interest ◽  
Gradient Plasticity ◽  
Recent Developments ◽  
Potential Tool

The purpose of this two-part article, is first to give an update of recent developments of gradient plasticity as this was advanced by Aifantis and co-workers in the early eighties to address dislocation patterning and shear band problems, and then to elaborate on two specific issues of current interest: size effects and plastic heterogeneity. In Part I, a brief review of gradient dislocation dynamics as providing a direct motivation for the simplest form of gradient plasticity is given. Then, a more general phenomenological formulation of gradient plasticity is given and used to interpret size effects. In Part II, wavelet analysis is used as a potential tool to describe plastic heterogeneity at very fine scales for which experimental results are not available, as well as for providing another means to interpret size effects through the derivation of scale-dependent constitutive equations.

scholarly journals Nonaccelerator study of the residual nuclear strong interaction

2021 ◽  
Keyword(s):  
Strong Interaction ◽  
Quantum Electrodynamics ◽  
Weak Interactions ◽  
Close Relation ◽  
Nuclear Interaction ◽  
Experimental Results ◽  
Strong Conclusion ◽  
Modern Physics ◽  
Recent Developments ◽  
Value Range

The present status and recent developments in the nonaccelerator study of residual strong nuclear interaction in solids are briefly reviewed. The emphasis is on new experimental results and they interpretation which were not available in earlier reviews. Artificial activation of the strong interaction by adding of one neutron to the nucleus causes the global reconstruction of the macroscopic characteristics of solids. The experimental evidence of macroscopic manifestation of the strong interaction in optical spectra of solids which is different by term of one neutron from each other (using LiD crystals instead of LiH) has been presented. This evidence is directly seen from luminescence (reflection) and scattering spectra. As far as the gravitation, electromagnetic and weak interactions are the same in both of kind crystals, it only emerges the strong interaction in deuterium nucleus. Therefore a sole conclusion is made that the renormalization of the energy of electromagnetic excitations (electrons, excitons, phonons) is carried out by the strong nuclear interaction. There is a common place in Standard Model of modern physics that the strong nuclear force does not act on leptons. Our experimental results show the violation of this strong conclusion. Moreover, observation of the isotopic shift phononless line in the photoluminescence (reflection) spectra of the whole series of LiHx D1-x mixed crystals is permit to construct change of the strong interaction coupling, α_{s}, in the wide value range. The necessity to take into account the more close relation between quantum chromodynamics and quantum electrodynamics is underlined. In the first step the quantum electrodynamics should be taken into account the strong interaction at the description of elementary excitations (electrons, excitons, phonons) dynamics in solids. Our experimental results open a new avenue in the investigation of the hadron - lepton interaction via study the low - temperature characteristics (reflection, photoluminescence) of solids and may shed light on a number of fundamental puzzles in modern physics, particularly on the unification of forces

scholarly journals Folding and necking across the scales: a review of theoretical and experimental results and their applications

Solid Earth ◽  
2016 ◽  
Vol 7 (5) ◽  
pp. 1417-1465 ◽  
Author(s):  
Stefan Markus Schmalholz ◽  
Neil Sydney Mancktelow
Keyword(s):  
Plate Tectonics ◽  
Numerical Models ◽  
Experimental Studies ◽  
Experimental Results ◽  
Practical Applications ◽  
Fundamental Parameters ◽  
Layered Rock ◽  
Amplification Rate ◽  
Lithospheric Plates ◽  
Recent Developments

Abstract. The shortening and extension of mechanically layered ductile rock generates folds and pinch-and-swell structures (also referred to as necks or continuous boudins), which result from mechanical instabilities termed folding and necking, respectively. Folding and necking are the preferred deformation modes in layered rock because the corresponding mechanical work involved is less than that associated with a homogeneous deformation. The effective viscosity of a layered rock decreases during folding and necking, even when all material parameters remain constant. This mechanical softening due to viscosity decrease is solely the result of fold and pinch-and-swell structure development and is hence termed structural softening (or geometric weakening). Folding and necking occur over the whole range of geological scales, from microscopic up to the size of lithospheric plates. Lithospheric folding and necking are evidence for significant deformation of continental plates, which contradicts the rigid-plate paradigm of plate tectonics. We review here some theoretical and experimental results on folding and necking, including the lithospheric scale, together with a short historical overview of research on folding and necking. We focus on theoretical studies and analytical solutions that provide the best insight into the fundamental parameters controlling folding and necking, although they invariably involve simplifications. To first order, the two essential parameters to quantify folding and necking are the dominant wavelength and the corresponding maximal amplification rate. This review also includes a short overview of experimental studies, a discussion of recent developments involving mainly numerical models, a presentation of some practical applications of theoretical results, and a summary of similarities and differences between folding and necking.

Recent developments in robotic tactile perception

2017 ◽  
Vol 44 (5) ◽  
pp. 565-570 ◽  
Author(s):  
Robert Bogue
Keyword(s):  
Object Recognition ◽  
Collision Detection ◽  
Design Methodology ◽  
Experimental Results ◽  
Tactile Sensing ◽  
Robotic Hands ◽  
Short Introduction ◽  
Content Type ◽  
Recent Developments ◽  
Insight Into

Purpose This paper aims to provide details of recent developments in robotic tactile sensing. Design/methodology/approach Following a short introduction, this paper first provides an overview of tactile sensing effects and technologies. It then discusses recent developments in tactile sensing skins. Tactile sensing for robotic prosthetics and hands is then considered and is followed by a discussion of “tactile intelligence”. Various experimental results are included. Finally, brief concluding comments are drawn. Findings This shows that many advanced, sensitive and technologically varied tactile sensing devices are being developed. These devices are expected to impart robots with a range of enhanced capabilities such as improved gripping and manipulation, object recognition, the control and robotic hands and prosthetics and collision detection. Originality/value Tactile sensing has an increasingly important role to play in robotics, and this paper provides a technical insight into a number of recent developments and their applications.

scholarly journals Experimental results and recent developments on the EU 2 MW 170 GHz coaxial cavity gyrotron for ITER

2012 ◽  
Vol 32 ◽  
pp. 04009 ◽  
Author(s):  
S. Kern ◽  
J.-P. Hogge ◽  
S. Alberti ◽  
K. Avramides ◽  
G. Gantenbein ◽  
...  
Keyword(s):  
Experimental Results ◽  
Coaxial Cavity ◽  
Recent Developments ◽  
The Eu

scholarly journals Development of a VTOL mini UAV for multi-tasking missions

2009 ◽  
Vol 113 (1140) ◽  
pp. 87-98 ◽  
Author(s):  
B. Bataillé ◽  
J.-M. Moschetta ◽  
D. Poinsot ◽  
C. Bérard ◽  
A. Piquereau
Keyword(s):  
Analytical Model ◽  
Aerodynamic Characteristics ◽  
Experimental Results ◽  
Flight Mechanics ◽  
Forward Flight ◽  
Control Loops ◽  
Transition Mechanism ◽  
Recent Developments ◽  
Points Of View ◽  
And Control

Abstract Recent developments in the field of Mini-UAVs lead to successful designs in both hovering rotorcraft and fixed wing aircraft. However, a polyvalent MAV capable of stable hovering and fast forward flight is still expected. A promising candidate for such versatile missions consists of a tilt-body tail-sitter configuration. That concept is studied in this paper both from the flight mechanics and control points of view. Developments are based on an existing prototype called Vertigo. It consists of a tail sitter fixed-wing mini-UAV equipped with a contra-rotating pair of propellers in tractor configuration. A wind-tunnel campaign was carried out to extract experimental results from the Vertigo aerodynamic characteristics. A 6-component sting balance was fitted in the powered model enabling excursion in angles of attack and sideslip angles up to 90°. Thus, a detailed understanding of the transition mechanism could be obtained. An analytical model including propwash effects was derived from experimental results. The analytical model was used to compute stability modes for specific flight conditions. This allowed an appropriate design of the autopilot capable of stabilisation and control over the whole flight envelope. A gain sequencing technique was chosen to ensure stability while minimising control loop execution time. A MATLAB-based flight simulator including an analytical model for the propeller slipstream has been developed in order to test the validity of airborne control loops. Simulation results are presented in the paper including hover flight, forward flight and transitions. Flight tests lead to successful inbound and outbound transitions of the Vertigo.

scholarly journals Folding and necking across the scales: a review of theoretical and experimental results and their applications

2016 ◽  
Author(s):  
Stefan Markus Schmalholz ◽  
Neil Mancktelow
Keyword(s):  
Plate Tectonics ◽  
Numerical Models ◽  
Experimental Studies ◽  
Experimental Results ◽  
Practical Applications ◽  
Fundamental Parameters ◽  
Layered Rock ◽  
Amplification Rate ◽  
Lithospheric Plates ◽  
Recent Developments

Abstract. Shortening and extension of mechanically-layered ductile rock generates folds and pinch-and-swell structures (also referred to as necks or continuous boudins), which result from mechanical instabilities termed folding and necking, respectively. Folding and necking occur in layered rock because the corresponding mechanical work involved is less than that associated with a homogeneous deformation. The effective viscosity of a layered rock decreases during folding and necking, even when all material parameters remain constant. This mechanical softening due to viscosity decrease is solely the result of fold and pinch-and-swell structure development and is hence termed structural softening (or geometric weakening). Folding and necking occur over the whole range of geological scales, from microscopic up to the size of lithospheric plates. Lithospheric folding and necking are evidence for significant deformation of continental plates, which contradicts the rigid-plate paradigm of plate tectonics. We review here some theoretical and experimental results on folding and necking, including the lithospheric scale, together with a short historical overview of research on folding and necking. We focus on theoretical studies and analytical solutions that provide the best insight into the fundamental parameters controlling folding and necking, although they invariably involve simplifications. To first order, the two essential parameters to quantify folding and necking are the dominant wavelength and the corresponding maximal amplification rate. This review also includes a short overview of experimental studies, a discussion of recent developments involving mainly numerical models, a presentation of some practical applications of theoretical results, and a summary of similarities and differences between folding and necking.

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