Status of the light ion source developments at CEA/Saclay

ACC NIMInternational audienceSILHI (High Intensity Light Ion Source) is an ECR ion source producing high intensity proton ordeuteron beams at 95 keV. It is now installed in the IPHI site building, on the CEA/Saclay center. IPHI is a frontend demonstrator of high power accelerator. The source regularly delivers more than 130 mA protons in CWmode and already produced more than 170 mA deuterons in pulsed mode at nominal energy. The last beamcharacterisations, including emittance measurements, space charge compensation analysis and diagnosticimprovements, will be reported. Taking into account the SILHI experience, new developments are in progress tobuild and test a 5 mA deuteron source working in CW mode. This new source will also operate at 2.45 GHz andpermanent magnets will provide the magnetic configuration. This source, of which the design will be discussed,will have to fit in with the SPIRAL 2 accelerator developed at GANIL to produce Radioactive Ion Beams. TheH- test stand status is briefly presented here and detailed in companion papers.This work is partly supported by the European Commission under contract n°: HPRI-CT-2001-50021

Hydrogen peroxide scavenging activity of grape (Vitis vinifera) methanolic extract

Grape is a fruit used since antiquity by man for its therapeutic virtues due to its richness in antioxidant molecules that can replace synthetic antioxidants such as butylated hydroxytoluene (BHT) and butylated hydroxyanisole (BHA) and tert-butylhydroquinone (TBHQ) which are dangerous for human health. Antioxidant activity of methanolic grape extract was evaluated using the hydrogen peroxide (H2O2) scavenging activity. The high percentages of H2O2 scavenging activity were obtained for black varieties (Gros noir and Muscat noir) with 72.86 and 65.72, respectively. The white variety (Victoria) has exhibited a percentage of 38.57 which is close to that obtained for Cardinal 2 (38.64) and higher than that obtained for Cardinal 1 (30.64) which is red variety. These results suggest that grape extracts may serve as a potential source of natural antioxidant for food preservative and pharmaceutical application even black, red or white varieties

A Java-Web-Based-Learning Methodology, Case Study : Waterborne diseases

A Java-Web-Based-Learning Methodology, Case Study : Waterborne diseases The recent advances in web technologies have opened new opportunities for computer-based-education. One can learn independently of time and place constraints, and have instantaneous access to relevant updated material at minimal cost. Several web-based-learning systems have been developed. But, they stay limited : they cannot control and guide the learner due to the lack of interactivity of the web. This article proposes a java-based-methodology for web-based-learning systems that transcends these limits. This methodology supports student understanding by providing appropriate and immediate feedback, and a high level of interactivity. Key Words:Computer-based-education/ Web-based-learning/ Interactivity/ Individualized learning java/ Applet. Une Méthodologie d `enseignement basée-Java : Etude de cas les maladies à transmission hydrique Les développements récents des technologies Web ont fait émerger de nouvelles approches pour l'enseignement assisté par ordinateur. En effet, l'apprenant peut apprendre indépendamment des contraintes de temps et de lieu. Plusieurs systèmes basés sur le Web ont été développés. Cependant, ils demeurent limités : ils ne peuvent pas contrôler et guider l'apprenant vu le manque d'interactivité du Web. Dans cet article, nous présentons une approche basée sur Java pour la conception de systèmes d'enseignement qui surmontent les limites des systèmes existants. Cette approche offre un apprentissage à distance, invidualisé tenant compte du rythme de l'apprenant et supportant ainsi un haut niveau d'interactivité. Une étude de cas est présentée concernant les maladies à transmission hydrique. Mots-clés : Enseignement assisté par ordinateur/ Enseignement à distance/ Java/ Apprentissage invidualisé. Revue d'Information Scientifique & Technique Vol.11(2) 2001: 11-1

Impact of refrigerated storage on the bioactive compounds and antioxidant capacity of two Algerian carrot varieties (Daucus carota L.)

Carrot (Daucus carota L.) is one of the main root vegetables rich in bioactive compounds with appreciable health-promoting properties, largely consumed in Algeria. In the current study, the storage effect (at 4 °C throughout 12 days) on bioactive compound stability and the antioxidant activity of two Algerian orange carrot varieties (Supermuscade and Touchon) were investigated. Total phenolic content of samples was determined by the Folin–Ciocâlteu method. Antioxidant capacity was determined spectrophotometrically, based on the evaluation of Free Radical Scavenging Activity (FRSA) using DPPH radical and Ferric Reducing Power (FRP). The results showed that the Touchon variety is richer in phenolics, flavonoids, and carotenoids and presents higher antioxidant activity in comparison with the Supermuscade variety. At the end of storage, the bioactive compound content and antiradical activity increased significantly (p < 0.05). Also, an extremely significant correlation (p < 0.001) was observed between the antioxidant contents and the antioxidant capacities of aqueous carrot extracts