Search results for " speed"
showing 10 items of 641 documents
Enhancing Speed Loop PI Controllers with Adaptive Feed-forward Neural Networks: Application to Induction Motor Drives
2022
This paper proposes the idea to improve the performance of the speed loop PI controller by using feed-forward and adaptive control actions. Indeed, when the system to be controlled is required to track a rapidly changing reference frame, higher bandwidth is usually required, making the system more sensitive to noise and consequently less robust. In such cases, to achieve a better performance in reference tracking while keeping noise rejection capacity, one idea is to use a feed-forward controller, employed to enhance the required tracking, leaving the feedback action to stabilize the system and suppress higher frequency disturbance. As such, this paper analysis the classical PI based field …
Infrastructure as interface. Thinking the urban and the high -speed station: italian case-studies.
2011
This presentation will document some results of an ongoing research focusing on the role of infrastructure in contemporary design practice. The methodology is based on critical design theory and combines theoretical aspects with a case-study approach, at the junction of infrastructure, urban design and architecture. It is already well documented that 19th and 20th century infrastructure have deeply affected their programs in order to face new challenges over the last 30 decades. Railway stations are leading examples in this fields: they have gradually implemented their design, that already integrated commercial spaces and facilities, until involving in public space transformation. Instead, …
A mass-independent expanded Dunham analysis of aluminum monoxide and aluminum monosulfide
2018
Abstract Pure rotational transitions of 27Al16O, 27Al18O, 27Al32S, and 27Al34S are recorded in the vibrational ground state and singly excited vibrational state using a mm-wavelength supersonic jet spectrometer in combination with a laser ablation source. In total 275 rotational transitions have been assigned. For the first time, mass-independent expanded Dunham analyses are performed using isotopologues of aluminum monoxide and aluminum monosulfide. The breakdown of the Born-Oppenheimer approximation is observed. Based on these mass-independent analyses, frequency positions of pure rotational transitions of the rare radioactive isotopologues 26AlO and 26AlS are predicted with uncertainties…
Low-energy Neutrino Astronomy in LENA
2015
LENA (Low Energy Neutrino Astronomy) is a proposed next-generation neutrino detector based on 50 kilotons of liquid scintillator. The low detection threshold, good energy resolution and excellent background rejection inherent to the liquid-scintillator detectors make LENA a versatile observatory for low-energy neutrinos from astrophysical and terrestrial sources. In the framework of the European LAGUNA-LBNO design study, LENA is also considered as far detector for a very-long baseline neutrino beam from CERN to Pyhasalmi ¨ (Finland). The present contribution gives an overview LENA’s broad research program, highlighting the unique capabilities of liquid scintillator for the detection of low-…
Modeling Atmospheric Turbulence via Rapid Distortion Theory: Spectral Tensor of Velocity and Buoyancy
2017
Abstract A spectral tensor model is presented for turbulent fluctuations of wind velocity components and temperature, assuming uniform vertical gradients in mean temperature and mean wind speed. The model is built upon rapid distortion theory (RDT) following studies by Mann and by Hanazaki and Hunt, using the eddy lifetime parameterization of Mann to make the model stationary. The buoyant spectral tensor model is driven via five parameters: the viscous dissipation rate ε, length scale of energy-containing eddies L, a turbulence anisotropy parameter , gradient Richardson number (Ri) representing the local atmospheric stability, and the rate of destruction of temperature variance . Model outp…
Validation of buoyancy driven spectral tensor model using HATS data
2016
We present a homogeneous spectral tensor model for wind velocity and temperature fluctuations, driven by mean vertical shear and mean temperature gradient. Results from the model, including one-dimensional velocity and temperature spectra and the associated co-spectra, are shown in this paper. The model also reproduces two-point statistics, such as coherence and phases, via cross-spectra between two points separated in space. Model results are compared with observations from the Horizontal Array Turbulence Study (HATS) field program (Horst et al. 2004). The spectral velocity tensor in the model is described via five parameters: the dissipation rate (), length scale of energy-containing eddi…
Speed in cognitive tasks as an indicator of second/foreign language reading and writing skills
2013
In a cross-sectional study 823 Finnish school children were tested to examine the relation between speed of performance in cognitive and linguistic tasks and second/foreign language reading and writing. Participants were Finnish-speakers with English as foreign language and Russian-speakers with Finnish as second language which made it possible to compare the results across these two language groups. The Finnish group was furthermore divided into three groups by age to see how speed develops with age and education. Groups were tested with a number of cognitive instruments that included measures of speed of performance. Overall, performance on the speed measures improved with age; often, the…
Real-time Control of Metallurgic Processes
1996
The careful control of the liquid metal solidification and the solid shell growth is of central importance in all metallurgic processes. These have a considerable influence on the formation of cracks and other defects which can be formed in the cast material. To ensure defect free products, the liquid metal is to be cooled down according to a pattern which depends i.e. on metal grade, product dimension, cooling speed and machine design. On the other hand, the control of the liquid/solid interface is a key element in optimising the liquid solidification with respect to good productivity. So, the heat transfer plays a very important role in metallurgic casting processes, especially when casti…
Is processing speed a valid neurocognitive endophenotype in bipolar disorder? Evidence from a longitudinal, family study.
2021
[Background] Substantial evidence supports the existence of neurocognitive endophenotypes in bipolar disorder (BD), but very few longitudinal studies have included unaffected relatives. In a 5-year, follow-up, family study, we have recently suggested that deficits in manual motor speed and visual memory could be endophenotype candidates for BD. We aimed to explore whether this also applies to processing speed.
LYON PART DIEU, HUB METROPOLITANO CONTEMPORANEO
2014
Lyon Part Dieu, contemporary metropolitan hub. By François Decoster, Djamel Klouche and Caroline Poulin. This article introduces a series of concepts developed by the AUC in its research on the theme of mobility, transportation, and stations in contemporary cities. The “inexorable station” in fact debates the need, for contemporary stations and more in general transportation venues, to evolve as projects for open spaces, to be porous with respect to the city while establishing with it an organic relationship. Stations are not just specialized venues dedicated to transportation, but more than ever they are becoming “initiators”, essential levers for urban development and regeneration in toda…