Search results for " Mill."
showing 10 items of 259 documents
Lignin recovery from spent alkaline pulping liquors using acidification, membrane separation, and related processing steps: A Review
2019
The separation of lignin from the black liquor generated during alkaline pulping is reviewed in this article with an emphasis on chemistry. Based on published accounts, the precipitation of lignin from spent pulping liquor by addition of acids can be understood based on dissociation equilibria of weak acid groups, which affects the solubility behavior of lignin-related chemical species. Solubility issues also govern lignin separation technologies based on ultrafiltration membranes; reduction in membrane permeability is often affected by conditions leading to decreased solubility of lignin decomposition products and the presence of colloidal matter. Advances in understanding of such phenomen…
Effect of nano-structuring on hydrogen sorption properties of LaNi5 systems
2010
Hydrogen sorption properties of the CaH2-MgB2-AlB2 system
2011
Hydrogen sorption in the CaH2+MgB2 system
2010
Ball milling and AlB2 addition effects on the hydrogen sorption properties of the CaH2 + MgB2 system
2010
Among the borohydrides proposed for solid state hydrogen storage,Ca(BH4)2 is particularly interesting because of its favourable thermodynamics and relatively cheap price.Composite systems,whereother species are present in addition to the borohydride,show some advantages in hydrogen sorption properties with respect to the borohydrides alone,despite a reduction of the theoretical storage capacity. We have investigated the milling time influence on the sorption properties of the CaH2 +MgB2 system from which Ca(BH4)2 and MgH2 can be synthesized by hydrogen absorption process.Manometric and calorimetric measurements showed better kinetics forlong time milled samples.We found that the total subst…
Hydrogen sorption properties of the composite system calcium hydride – magnesium boride
2010
Nanostructured Materials and Systems for Hydrogen Technology
2011
Tradicions i línies de recerca en Organització escolar
2018
El document forma part dels materials docents programats mitjançant l'ajut del Servei de Política Lingüística de la Universitat de València Aquesta publicació pretén aprofundir en l’evolució de les principals tradicions i estratègies d’investigació que més impacte i repercussió han tingut en l’organització escolar. Moviments que enfoquen el centre escolar com a factor clau de millora i unitat bàsica del canvi educatiu. Entre aquestes, destaquem el moviment de les escoles eficaces, la millora de l’escola, la millora de l’eficàcia escolar, el desenvolupament organitzatiu i les organitzacions que aprenen, entre d’altres. Aquestes línies d’investigació han insistit en la importància i el recone…
Acid-catalyzed mechanocatalytic pretreatment to improve sugar release from birch sawdust : Structural and chemical aspects
2022
This study examined acid-catalyzed mechanocatalytic pretreatment of birch sawdust without a separate impregnation step. Catalyst amount and pretreatment time were the key variables. Pretreated material was mixed with water for hydrolysis (100 °C, 60 min). The efficient release of total reducing sugars from birch sawdust is significant to the path towards biofuels and biochemicals. Based on the results, the structure and surface of birch sawdust changed as a function of mechanocatalytic pretreatment. Milling time caused significant transformations in birch structure and also increased the yields of reducing sugars. The highest yield of total reducing sugar from pretreated sawdust was 23.0% a…
Scrittrici e memoria della shoah: Liana Millu e Edith Bruck
2015
The objective of this text is to analyse some works of Liana Millu and Edith Bruck within the frame of the literature written about the Shoah, establishing a parallel between both writers and reading them, most of all, considering their relation established with their dead mothers and with maternity.