9 research outputs found
On Taylor and other joint spectra for commuting n-tuples of operators
AbstractLet R and S be commuting n-tuples of operators. We will give some spectral relations between RS and SR that extend the case of single operators. We connect the Taylor spectrum, the Fredholm spectrum and some other joint spectra of RS and SR. Applications to Aluthge transforms of commuting n-tuples are also provided
Evaluation de la qualitĂ© et de la composition chimique de trois huiles extraites Ă partir de pĂ©pins dâagrumes cultivĂ©s dans lâoriental du Maroc
In eastern Morocco, new cooperatives of citrus fruit technological transformation begin to be installed. The seeds resulting from these transformation processes remain without any valorization. This study concerns the physico-chemical characterization of three different citrus seed oils (Citrus limon (Citron), Citrus aurantium (Bigarade) and Citrus clementina (Clementine de Berkane)), cultivated in eastern Morocco. The seed oils were mechanically extracted by oil press and the oil yield, quality indices (acidity, peroxide, saponification, and refraction indices), polyphenol contents, antioxidant activity and fatty acid profile were analyzed. The mechanical yield varies between 15% for Bigarade seed oil and 29% for Lemon seed oil. The acidity, peroxide, saponification, and refraction indices varied between 0.55 - 0.57% of oleic acid, 5.77 to 10.34 meqO2/kg of oil, 116.67 and 173.53 mg KOH /g and 1.4699-1.4718 for the 3 studied seed oils, respectively. The polyphenols varied from 565 to 913 mg / 100g and the antioxidant activity ranged between 30 and 50%. The fatty acid profiles, of the analyzed citrus seed oils, presented 5 major fatty acids with the dominance of linoleic acid (C18: 2) which presented 34% for Clementine and Lemon seed oils and 35.5% for Bigarade seed oil.  Au niveau de la rĂ©gion de lâoriental du Maroc, de nouvelles coopĂ©ratives commencent Ă sâinstaller et sont actives dans la transformation technologique des agrumes. Les pĂ©pins issus de ces procĂ©dĂ©s de transformation restent sans valorisation. Cette Ă©tude porte sur la caractĂ©risation physico-chimique dâhuiles de pĂ©pins des fruits de 3 espĂšces dâagrume Citrus limon (Citron), Citrus aurantium (Bigarade) et Citrus clementina (ClĂ©mentine), cultivĂ©es au niveau de la rĂ©gion de lâoriental du Maroc. Les huiles de pĂ©pins sont extraites mĂ©caniquement par une presse Ă huile de type vis sans fin, le rendement en huile, lâaciditĂ©, les indices de qualitĂ©s (dâindice de peroxyde, de saponification et de rĂ©fraction), la teneur en polyphĂ©nols, lâactivitĂ© antioxydante ainsi que le profil des acides gras ont Ă©tĂ© dĂ©terminĂ©s. Le rendement dâextraction par pressage varie entre 15 % pour lâhuile de pĂ©pin de Bigarade et 29 % pour huile de pĂ©pin de Citron. Pour les 3 huiles de pĂ©pins Ă©tudiĂ©es, lâaciditĂ©, lâindice de peroxyde, lâindice de saponification et indice de rĂ©fraction varient entre 0,55-0,57 % dâacide olĂ©ique, 5,77-10,34 meqO2/kg dâhuile, 116,67 et 173,53 mg KOH/g et 1,4699-1,4718 respectivement. La teneur en polyphĂ©nols change de 565 Ă 913 mg dâacide cafĂ©ique/100g dâhuile et le pourcentage dâinhibition sâoscille entre 30 et 50 %. Les profils des acides gras, des huiles de pĂ©pin dâagrumes analysĂ©es, prĂ©sentent 5 principaux acides gras avec la dominance de lâacide linolĂ©ique (C18 :2) dont les teneurs sont 34% pour les huiles de pĂ©pin de ClĂ©mentine et de Citron et 35,5% pour lâhuile de pĂ©pin de Bigarade
Bounded point evaluations for cyclic hyponormal operators
Consiglio Nazionale delle Ricerche - Biblioteca Centrale - P.le Aldo Moro, 7 Rome / CNR - Consiglio Nazionale delle RichercheSIGLEITItal
Calcul flatulent de Wermer et spectra local
Consiglio Nazionale delle Ricerche - Biblioteca Centrale - P.le Aldo Moro, 7 Rome / CNR - Consiglio Nazionale delle RichercheSIGLEITItal
Classes de shifs decomposables sur les espaces de Beurling
Consiglio Nazionale delle Ricerche - Biblioteca Centrale - P.le Aldo Moro, 7 , Rome / CNR - Consiglio Nazionale delle RichercheSIGLEITItal
Orthography and local spectrum
Consiglio Nazionale delle Ricerche - Biblioteca Centrale - P.le Aldo Moro, 7 , Rome / CNR - Consiglio Nazionale delle RichercheSIGLEITItal