Search results for "figuration"
showing 10 items of 615 documents
<title>Achieving high performances at lower cost for real-time image rotation by using dynamic reconfiguration</title>
2001
FPGA components are widely used today to perform various algorithms (digital filtering) in real time. The emergence of Dynamically Reconfigurable (DR) FPGAs made it possible to reduce the number of necessary resources to carry out an image processing application (tasks chain). We present in this article an image processing application (image rotation) that exploits the FPGA's dynamic reconfiguration feature. A comparison is undertaken between the dynamic and static reconfiguration by using two criteria, cost and performance criteria. For the sake of testing the validity of our approach in terms of Algorithm and Architecture Adequacy , we realized an AT40K40 based board ARDOISE.
Experimental design method to the weld bead geometry optimization for hybrid laser-MAG welding in a narrow chamfer configuration
2017
International audience; The work presented in this paper relates to the optimization of operating parameters of the welding by the experimental design approach. The welding process used is the hybrid laser-MAG welding, which consists in combining a laser beam with an MAG torch, to increase the productivity and reliability of the chamfer filling operation in several passes over the entire height of the chamfer. Each pass, providing 2 mm deposited metal and must provide sufficient lateral penetration of about 0.2 mm. The experimental design method has been used in order to estimate the operating parameters effects and their interactions on the lateral penetration on one hand, and to provide a…
Theoretical approaches for geometric optimization of urban forms : towards a fractal development of the city
2017
This thesis aims to establish a urban structure that optimizes inhabitant's preferences. In other words, we want to find out which city shape answers the best the residents' aspirations, according to their consumption preferences for urban and green amenities. By considering a theoretical field of study and by characterizing the population by a Cobb-Douglas behavioral pattern, we will build step by step a city, assuming successive arrivais of new individuals, in order to find out which geometric shape gives the most suitable answer. The final goal of this thesis is there to suggest a city with a fractal shape as an appro- priate answer to the resident's expectations. We will show that this …
Indole Diterpenoids from an Endophytic Penicillium sp.
2019
A chemical investigation of the endophyte Penicillium sp. (strain ZO-R1-1), isolated from roots of the medicinal plant Zingiber officinale, yielded nine new indole diterpenoids (1-9), together with 13 known congeners (10-22). The structures of the new compounds were elucidated by 1D and 2D NMR analysis in combination with HRESIMS data. The absolute configuration of the new natural products 1, 3, and 7 was determined using the TDDFT-ECD approach and confirmed for 1 by single-crystal X-ray determination through anomalous dispersion. The isolated compounds were tested for cytotoxicity against L5178Y, A2780, J82, and HEK-293 cell lines. Compound 1 was the most active metabolite toward L5178Y ce…
Exploring the Relationship between Information Technology Infrastructure Library and Process Management: Theory Development and Empirical Testing
2014
This paper investigates whether information technology (IT) departments that implement the IT Infrastructure Library (ITIL) processes also employ process management. This is a pertinent issue, as ITIL not only implies a time-limited program for redesigning vital IT processes according to best practices but a complete transformation to ITIL also implies that processes are managed on a daily basis. Without process management, ITIL will not be a success beyond its initial implementation. A survey of 444 Nordic ITIL experts was conducted to examine if there is a correlation between the implementation of ITIL processes and process management. The results are unambiguous and promising for sustain…
Regional Susceptibility in VCD Spectra to Dynamic Molecular Motions
2018
Experimental and theoretical studies of the vibrational circular dichroism (VCD) spectrum of 3-methyl-1-(methyldiphenlsilyl)-1-phenylbutan-1-ol, whose absolute configuration is key to elucidating the Brook rearrangement of tertiary benzylic α-hydroxylsilanes, are presented. It is found that the entire OH-bending region in this spectrum—a region that provides important marker bands—cannot be reproduced at all by standard theoretical approaches even though other regions are well described. Using a novel approach to disentangle contributions to the rotational strength of these bands, internal coordinates are identified that critically influence the appearance of this part of the spectrum. We s…
Kristall‐ und Molekülstruktur sowie absolute Konfiguration des (+)‐Benzylmethyl‐α‐naphthylphenylphosphonium‐bromids
1975
(+)-Benzylmethyl-α-naphthylphenylphosphonium-bromid kristallisiert in der Raumgruppe P212121 mit den Gitterkonstanten a = 22.12 A, b = 9.89 A,c = 9.49A und mit vier Molekulen in der Elementarzelle. Die Struktur wurde nach der Schweratommethode aufgeklart und bis zu einem R-Wert von 5.8% verfeinert. Unter Berucksichtigung der anomalen Dispersion konnte die absolute Konfiguration ermittelt werden, es liegt R-Konfiguration vor. Crystal- and Molecular Structure of (+)-Benzylmethyl-α-naphthylphenylphosphonium Bromide (+)-Benzylmethyl-α-naphthylphenylphosphonium bromide crystallizes in the space group P212121 with four molecules in the unit cell of dimensions a = 22.12 A, b = 9.89 A, c = 9.49 A. …
syn ‐[2.2](1,3)Cyclophane durch doppelte Photocyclodimerisierung
1988
Durch doppelte Cyclodimerisierung wird in einer Photolyse in Losung aus dem 1,3-disubstituierten Benzol 3 das syn[2.2](1,3)Cyclophan 4 erhalten. Eine kombinierte Belichtung Festkorper/Losung ergibt bei 5 das analoge System 6 mit Estergruppen. Beide Reaktionen erfolgen streng regiospezifisch durch Kopf-Kopf-Verknupfung und stereospezifisch bezuglich der syn-Geometrie im Cyclophan und der trans-Konfiguration der Vierringsubstituenten. Die einzige stereochemische Freiheit besteht in der Anordnung der Vierringe, wobei die Isomeren 4/6a,b,c, den drei moglichen Rotameren in 3 und 5 entsprechen. Wahrend das Gerust von 4 starr ist, zeigt 6 bei Raumtemp. eine langsame Inversion des zentralen 10-Ring…
The Role of C–H···H–B Interactions in Establishing Rotamer Configurations in Metallabis(dicarbollide) Systems
2010
The aim of this work is to explore the self-interaction capability of the anion [3,3′-Co(1,2-C2B9H11)2]– through Ccluster–H···H–B (Cc–H···H–B) dihydrogen bonds. A set of theoretical and empirical data aiming to establish the main rules that account for the binding mode between the negatively charged borane framework made by [3,3′-Co(1,2-C2B9H11)2]– and the [NMe4]+ ions have been compiled. The interaction between cation and anion is mainly electrostatic but the covalent contribution is also proven and quantified. The existing intermolecular H···H short contacts have been studied and are compared with available data from the Cambridge Structural Database. The results show that the electronic …
Reconfigurable electrical interconnection strategies for photovoltaic arrays: A review
2014
Non-uniform irradiance significantly decreases the power delivered by solar photovoltaic arrays. A promising technique for compensating these power losses relies on dynamically reconfiguring the electrical connections between photovoltaic modules. This paper presents the current state-of-the-art strategies for photovoltaic array reconfiguration in order to increase the power output under partial shading and mismatch conditions. The different approaches have been compared in terms of effectiveness of the control algorithms, monitored electrical and environmental variables, overall hardware complexity and specific features of each solution. Finally, the most challenging aspects of the reconfi…