Design, production and characterisation of granular adsorbent material for arsenic removal from contaminated wastewater

The objective of this research was to design granulated iron oxide for the adsorption of heavy metals from wastewater. Polyvinyl acetate (PVAc) was chosen as a suitable binder; as it is water insoluble. Initial experiments on selection of suitable solvent of the polymer were carried out using three solvents namely; methanol, acetone and toluene. Based on the initial tests on product yield and mechanical strength, acetone was selected as the solvent for the polyvinyl acetate binder. Design of experiment was then used to investigate the influence of granulation process variables; impeller speed, binder concentration and liquid to solid ratio on the properties of the granular materials. The response variables in the study were granules mean size, stability in water and granule strength. The results showed that the combination of high impeller speed and high binder concentration favour the formation of strong and stable granules. Results also showed that leaching of the binder into the simulated was water was negligible. Trial adsorption experiments carried out using the strongest and most stable iron oxide granules produced in this work showed removal efficiency of around 70% of synthetic arsenic solutions with initial concentration of 1000 ppb.

Flexibel mit „make or buy"

Im Artikel geht es um die Frage, ob es sich für Unternehmen lohnt, Materialen selbst herzustellen oder einzukaufen.

Estimação de cobertura rádio em comunicações ferroviárias

Trabalho Final de Mestrado para obtenção do grau de Mestre em Engenharia de Electrónica e Telecomunicações

Prevalence and clinical importance of mesenteric venous thrombosis in the swiss inflammatory bowel disease cohort.

OBJECTIVE. The purpose of this study was to evaluate the prevalence of mesenteric venous thrombosis (MVT) in the Swiss Inflammatory Bowel Disease Cohort Study and to correlate MVT with clinical outcome. MATERIALS AND METHODS. Abdominal portal phase CT was used to examine patients with inflammatory bowel disease (IBD). Two experienced abdominal radiologists retrospectively analyzed the images, focusing on the superior and inferior mesenteric vein branches and looking for signs of acute or chronic thrombosis. The location of abnormalities was registered. The presence of MVT was correlated with IBD-related radiologic signs and complications. RESULTS. The cases of 160 patients with IBD (89 women, 71 men; Crohn disease [CD], 121 patients; ulcerative colitis [UC], 39 patients; median age at diagnosis, 27 years for patients with CD, 32 years for patients with UC) were analyzed. MVT was detected in 43 patients with IBD (26.8%). One of these patients had acute MVT; 38, chronic MVT; and four, both. The prevalence of MVT did not differ between CD (35/121 [28.9%]) and UC (8/39 [20.5%]) (p = 0.303). The location of thrombosis was different between CD and UC (CD, jejunal or ileal veins only [p = 0.005]; UC, rectocolic veins only [p = 0.001]). Almost all (41/43) cases of thrombosis were peripheral. MVT in CD patients was more frequently associated with bowel wall thickening (p = 0.013), mesenteric fat hypertrophy (p = 0.005), ascites (p = 0.002), and mesenteric lymph node enlargement (p = 0.036) and was associated with higher rate of bowel stenosis (p < 0.001) and more intestinal IBD-related surgery (p = 0.016) in the outcome. Statistical analyses for patients with UC were not relevant because of the limited population (n = 8). CONCLUSION. MVT is frequently found in patients with IBD. Among patients with CD, MVT is associated with bowel stenosis and CD-related intestinal surgery.

Toward interoperable bioscience data.

To make full use of research data, the bioscience community needs to adopt technologies and reward mechanisms that support interoperability and promote the growth of an open 'data commoning' culture. Here we describe the prerequisites for data commoning and present an established and growing ecosystem of solutions using the shared 'Investigation-Study-Assay' framework to support that vision.

Interleukin-33 safeguards neutrophils in sepsis.

Cytokines have a fundamental role in orchestrating innate immune responses to bacterial infections. Interleukin-33 (IL-33) is now shown to protect from sepsis by promoting neutrophil influx into the focus of infection

Extraits relatifs à l'histoire de l'empire ottoman.

Le premier (folio 1 verso), qui est incomplet de ses derniers feuillets, contient les événements des règnes des sultans Selim II et Mourad III ; le second (folio 61 recto) commence dans le bas d'une page par un chapitre dans lequel se trouve narrée la manière dont les Karamaniens se produisirent sur la scène du monde, en l'année 676 de l'hégire (1277), sous le règne du sultan d'Égypte el-Melik el-Zahir Baïbars ; il contient un abrégé sans intérêt de l'histoire osmanlie jusqu'à la fin du règne du sultan Soleïman II ; le texte de ces extraits se trouve, en de nombreux endroits, interrompu par des espaces qui ont été laissés en blanc.

L'expérience et approbation, Ulrich de Hutem,... : touchant la médecine du boys dit guaiacii pour circonvenir et déchasser la maladie de Neaples ([Reprod.]) / traduicte et interprétée par maistre Jehan Cheradame,...

Collection : French books before 1601 ; 413.3

Breviarium totius juris canonici ([Reprod.]) / Paulus Florentinus

Collection : French books before 1601 ; 134.2

Sermones praedicabiles ([Reprod.]) / Paulus Florentinus

Collection : Italian books before 1601 ; 528.1

L'Écho de Paris

1888/06/15 (Numéro 1546).