Piezoelectric and optical setup to measure an electrical field: Application to the longitudinal near-field generated by a tapered coax

We propose a new setup to measure an electrical field in one direction. This setup is made of a piezoelectric sintered lead zinconate titanate film and an optical interferometric probe. We used this setup to investigate how the shape of the extremity of a coaxial cable influences the longitudinal electrical near-field generated by it. For this application, we designed our setup to have a spatial resolution of 100 um in the direction of the electrical field. Simulations and experiments are presented

A multipolymer system for organocatalytic alcohol oxidation

A system involving two polymer-supported reagents for the selective and organocatalytic oxidation of alcohols to aldehydes or ketones has been developed in which both polymeric reagents can be recovered and reused. © The Royal Society of Chemistry 2005.postprin

Modification of Tillage Implements for Alley Cropping System

Sustainable alley agriculture in the agro-forestry cropping system becomes a great challenge due to the lack of suitable land preparation, using the conventional tillage system “The three-bottom disc plough”. This research is an attempt to modify the conventional tillage implement for better use in agroforestry system. The modified Tillage System, in comparison with 3-bottom disc plough, showed significantly lower tractor actual speed, higher wheel slippage, effective field capacity and higher draught requirements. For the secondary operations, no significant differences were detected between modified tandem and the offset disc harrow, except for the tractor actual speed, where the offset disc harrow resulted in significant higher speed. Moreover, the modified tillage implements shows lower un-ploughed length area within the alley, and two meters increase in the preparation of the available cultivated area compared to the conventional system, and significantly lower bulk density at crop emergence stage only. The modified implements resulted in higher initial and final infiltration rate after seedbed preparation and at harvest in comparison with the conventional system. With regards to crop yield, the modified tillage system resulted in significant higher grain yield in the first and second seasons, in comparison with the use of the conventional tillage system. Keywords: draught requirements, tillage implements, alley cropping, soil cold size, bulk density, superficial lateral root, infiltration rat

Time variations in the deep underground muon flux measured by MACRO

More than 30 million of high-energy muons collected with the MACRO detector at the underground Gran Sasso Laboratory have been used to search for flux variations of different natures. Two kinds of studies were carried out: search for periodic variations and for the occurrence of clusters of events. Different analysis methods, including Lomb-Scargle spectral analysis and Scan Test statistics have been applied to the data.Comment: 6 pages, 4 EPS figures. Talk given at the 29th ICRC, Pune, India, 3-10 August 200

Etude épidémiologique et clinique des détresses respiratoires aigues chez les enfants âgés de 1 à 59 mois admis dans le service des urgences pédiatriques au CHU Gabriel Toure

Introduction : Les détresses respiratoires sont une cause majeure de morbidité et de mortalité en pédiatrie ; l’objectif de notre étude était d’étudier les aspects épidemiocliniques des détresses respiratoires chez les enfants âgés de 1 à 59 mois dans le service de pédiatrie de CHU. Gabriel Toure. Méthodologie : Il s’agit d’une étude transversale descriptive sur douze mois du 1er au 31 décembre 2012 au service de pédiatrie du CHU Gabriel Touré Bamako Mali. Tous les enfants de 1 à 59 mois présentant une détresse respiratoire ont été inclus. Résultats : Ainsi 678 dossiers d’enfants en détresse respiratoire sur un total de 2241 hospitalisés en pédiatrie ont été analysés soit un taux d’admission de 30,25%. 64,75% des enfants avaient un âge compris entre 1 et 11 mois. Le sex-ratio était de 1,38 en faveur des garçons; les signes de lutte respiratoire (battement des ailes du nez, tirage intercostal et le geignement) étaient présents dans 96,22%. La pathologie pulmonaire la plus fréquente était la pneumonie (68,36%) celle extra-pulmonaire était le paludisme grave (11,80%). Le taux de mortalité était de 20,65%. Conclusion : les détresses respiratoires restent une importante cause de mortalité du nourrisson dans notre contexte avec des problèmes majeurs de prise en charg

Fragmentation studies of 158 A GeV Pb ions using CR39 nuclear track detectors

Six stacks of CR39 nuclear track detectors with different targets were exposed to a lead ion beam of 158 A GeV at the CERN-SPS, at normal incidence, in order to study the fragmentation properties of ultra-relativistic lead nuclei. Measurements of the total, break-up and pick-up charge-changing cross sections of 158 A GeV Pb ions have been made for the first time

Time variations in the deep underground muon flux

More than 35 million high-energy muons collected with the MACRO detector at the underground Gran Sasso Laboratory have been used to search for flux variations of different nature. Two kinds of studies were carried out: a search for the occurrence of clusters of events and a search for periodic variations. Different analysis methods, including the Scan Statistics test and the Lomb-Scargle spectral analysis have been applied to the data.Comment: 7 pages, 5 figures, accepted by EP