319 research outputs found
Sampling constants in generalized Fock spaces
We discuss sampling constants for dominating sets in generalized Fock spaces.Comment: arXiv admin note: text overlap with arXiv:2004.0503
Modeles mathematiques du mode temps monopartage des systemes informatiques dâentreprise
Principles of the models development of optimum management processes of access in the computers networks of the corporative information systems are reviewed and the results of the adequacy estimation of these models are presented.Dans le travail nous considérons les principes de conception
des modĂšles de processus optimaux de contrĂŽle dâaccĂšs dans
les réseaux informatiques des systÚmes informatiques
dâentreprise et prĂ©sentons les rĂ©sultats dâĂ©valuation de
lâadĂ©quation de ces modĂšles
Antécédents culturaux et identification de quelques pratiques paysannes en replantation cacaoyÚre en CÎte d'Ivoire
La CĂŽte dâIvoire est le premier producteur mondial de cacao, avec plus de 1700 000 tonnes. Cette performance a Ă©tĂ© atteinte, principalement, par lâaccroissement des superficies cultivĂ©es aux dĂ©pends de la forĂȘt. LâenquĂȘte a concernĂ© les parcelles de cacaoyers de moins de 5 ans (0-5 ans) et chaque producteur a Ă©tĂ© enquĂȘtĂ© individuellement, chacun sur sa parcelle, afin de confronter les rĂ©ponses aux observations de terrain. Les rĂ©sultats des enquĂȘtes effectuĂ©es, entre 2002 et 2003, par le projet PIC-CACAO, montrent que trois types dâantĂ©cĂ©dents culturaux sont actuellement utilisĂ©s pour la culture du cacaoyer en CĂŽte dâIvoire. Il sâagit des vieilles cacaoyĂšres, des vieilles cafĂ©iĂšres et des jachĂšres, moins favorables Ă la culture du cacaoyer. Face aux contraintes rencontrĂ©es au cours du renouvellement du verger cacaoyer sur ces antĂ©cĂ©dents, les producteurs ont, soit adoptĂ© des techniques proposĂ©es par la recherche, soit adaptĂ© certaines de leurs pratiques endogĂšnes aux nouvelles conditions écologiques et naturelles du milieu. Les adoptions ont concernĂ©s lâutilisation de matĂ©riel vĂ©gĂ©tal amĂ©liorĂ©, issu des pĂ©piniĂšres, sur les jachĂšres. Quant aux adaptations, elles se sont traduites par la pratique de fortes densitĂ©s de plantation de jeunes cacaoyers et par la densification de lâombrage.Mots clĂ©s: Cacaoyer, antĂ©cĂ©dents culturaux, adoptions, adaptations, CĂŽte dâIvoireEnglish Title: Cropping history and identification of some farmer pratices in cocoa replanting in CĂŽte dâIvoireEnglish AbstractCĂŽte dâIvoire is the first producer of cocoa worldwide with more than 1700 000 tons. This performance was reached, mainly, by the increase of acreages at the expense of the forest. The investigation concerned the cocoa plots under 5 years (0-5 years) and each producer was investigated individually, each on his plot in order to compare his responses with field observations. The results of the investigations carried out, between 2002 and 2003, by PIC-cacao project, show that three types of antecedents are currently used for the culture of the cocoa-tree. They are the old cocoa plantations, the old coffee plantations and the fallow, less favourable of the cultivation of cocoa. Faced with the constraints during the renewal of the cocoaorchard on these antecedents, producers adopted techniques proposed by research or adapted some endogenous practices to the new ecological and natural conditions of the environment. The adoptions related to the use of vegetable material improved and nurseries on the fallow. As for the adaptations, they resulted in the use of high densities of plantation of young cocoa-trees and to the thickening of the shade.Keywords: Cocoa-orchard (Theobroma cacao L.), farming antecedents, adoptions, adaptations, CĂŽte dâIvoir
Past, Present and Future Perspectives on Groundnut Breeding in Burkina Faso
Groundnut (Arachis hypogaea L.) is a major food and cash crop in Burkina Faso. Due to
the growing demand for raw oilseeds, there is an increasing interest in groundnut production from
traditional rain-fed areas to irrigated environments. However, despite implementation of many
initiatives in the past to increase groundnut productivity and production, the groundnut industry still
struggles to prosper due to the fact of several constraints including minimal development research
and fluctuating markets. Yield penalty due to the presence of drought and biotic stresses continue
to be a major drawback for groundnut production. This review traces progress in the groundnut
breeding that started in Burkina Faso before the countryâs political independence in 1960 through to
present times. Up to the 1980s, groundnut improvement was led by international research institutions
such as IRHO (Institute of Oils and Oleaginous Research) and ICRISAT (International Crops Research
Institute for the Semi-Arid Tropics). However, international breeding initiatives were not suïżœcient to
establish a robust domestic groundnut breeding programme. This review also provides essential
information about opportunities and challenges for groundnut research in Burkina Faso, emphasising
the need for institutional attention to genetic improvement of the crop
Manganese pigmented anodized copper as solar selective absorber
The study concerns the optical and structural properties of layers obtained by a new efficient surface treatment totally free of chromium species. The process is made up of an anodic oxidation of copper in an alkaline solution followed by an alkaline potassium permanganate dipping post-treatment. Coatings, obtained at the lab and pilot scales, are stable up to 220 °C in air and vacuum, present low emissivity (0.14 at 70 °C) and high solar absorptivity (0.96), i.e. a suitable thermal efficiency (0.84 at 70 °C)
Application of Upflow Anaerobic Sludge Blanket (UASB) Reactor Technology for Wastewater Treatment: Technical, Environmental and Socio-Economic Assessment in Developing Countries
Anti-proliferative effect of Scoparia dulcis L. against bacterial and fungal strains
Scoparia dulcis L. was sequentially extracted with hexane, chloroform and methanol and soaked with aqueous-acetone (80%) to check for its antimicrobial activities against five bacterial and four fungal strains.250ÎŒg of each extract loaded on a whatman paper disc exhibited significant antimicrobial activities on all the fungus and against Gram-negative and Gram-positive bacteria. Therefore, P. mirabilis is less sensitive to all the extracts while B. cereus, a Ăą-lactamase producer bacterium, was resistant to the activity of the polar methanol and aqueous-acetone extracts. By the microdilution method, the most active extracts were chloroform extract on B. cereus with minimal inhibitory concentration (MIC) of 1.56 mg/ml and Aqueous-acetone extract on S. typhimurium (MIC = 1.56 mg/ml); the antifungal activity was strongest for hexane extract (MIC = 6.25 mg/ml) on both A. niger and P. roquefortii.Keywords: Scoparia dulcis, Antibacterial, Antifungal, Polyphenols
Direct Percutaneous Approach for Endoluminal Glue Embolization of Stomal Varices
The present report describes the authors\u27 experience with direct endoluminal embolization for bleeding stomal varices. Between December 1998 and July 2006, seven patients with enterostomies, portal hypertension, and recurrent stomal variceal bleeding resistant to medical treatment were treated at a single institution. Ultrasonography was used to guide direct puncture of the varices. Direct endoluminal embolization with cyanoacrylate glue was performed under fluoroscopic control imaging. Embolization was successful in six of seven cases. One patient with hepatocellular carcinoma and complete portal thrombosis had three recurrences treated with the same technique, with clinical success. Three patients died at 3, 8, and 18 months without recurrence of bleeding. Although further evaluation is indicated, direct percutaneous embolization appears to be a potential alternative treatment for bleeding stomal varices
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