36 research outputs found
Hidrólise de enzimas lignocelulolíticas de basidiomicetos dos gêneros ganoderma e lentinula em madeira pré-tratada.
Avaliação de basidiomicetos para produção de enzimas lignocelulolíticas em fermentação submersa em diferentes substratos.
Produção e acúmulo de nutrientes em povoamento de eucalipto em consequência da intensidade do desbaste e da fertilização
Orientational Effects and Random Mixing in 1-Alkanol + Alkanone Mixtures
1-Alkanol + alkanone systems have been investigated through the data analysis of molar excess functions,
enthalpies, isobaric heat capacities, volumes and entropies, and using the Flory model and the formalism of the concentrationconcentration
structure factor (SCC(0)). The enthalpy of the hydroxyl-carbonyl interactions has been evaluated. These
interactions are stronger in mixtures with shorter alcohols (methanol-1-butanol) and 2-propanone or 2-butanone. However,
effects related to the self-association of alcohols and to solvation between unlike molecules are of minor importance when
compared with those which arise from dipolar interactions. Physical interactions are more relevant in mixtures with longer
1-alkanols. The studied systems are characterized by large structural effects. The variation of the molar excess enthalpy with the
alcohol size along systems with a given ketone or with the alkanone size in solutions with a given alcohol are discussed in terms of
the different contributions to this excess function. Mixtures with methanol show rather large orientational effects. The random
mixing hypothesis is attained to a large extent for mixtures with 1-alkanols ≠ methanol and 2-alkanones. Steric effects and
cyclization lead to stronger orientational effects in mixtures with 3-pentanone, 4-heptanone, or cyclohexanone. The increase of
temperature weakens orientational effects. Results from SCC(0) calculations show that homocoordination is predominant and
support conclusions obtained from the Flory model.Ministerio de Ciencia e Innovación, under Project
FIS2010-1695
Orientational Effects and Random Mixing in 1‑Alkanol + Nitrile Mixtures
1-Alkanol + alkanenitrile or + benzonitrile systems have been investigated by means of the molar excess
functionsenthalpies (Hm E ), isobaric heat capacities (Cp,m
E ), volumes (Vm E ), and entropiesand using the Flory model and the
concentration−concentration structure factor (SCC(0)) formalism. From the analysis of the experimental data available in the
literature, it is concluded that interactions are mainly of dipolar type. In addition, large Hm E values contrast with rather low Vm E
values, indicating the existence of strong structural effects. Hm E measurements have been used to evaluate the enthalpy of the
hydroxyl−nitrile interactions (ΔHOH−CN). They are stronger in methanol systems and become weaker when the alcohol size
increases. In solutions with a given short chain 1-alkanol (up to 1-butanol), the replacement of ethanenitrile by butanenitrile
weakens the mentioned interactions. Application of the Flory model shows that orientational effects exist in methanol or 1-
nonanol, or 1-decanol + ethanenitrile mixtures. In the former solution, this is due to the existence of interactions between unlike
molecules. For mixtures including 1-nonanol or 1-decanol, the systems at 298.15 K are close to their UCST (upper critical
solution temperature), and interactions between like molecules are dominant. Orientational effects also are encountered in
methanol or ethanol + butanenitrile mixtures because self-association of the alcohol plays a more important role. Aromaticity
effect seems to enhance orientational effects. For the remainder of the systems under consideration, the random mixing
hypothesis is attained to a rather large extent. Results from the application of the SCC(0) formalism show that homocoordination
is the dominant trend in the investigated solutions, and are consistent with those obtained from the Flory model
The ATLAS trigger system for LHC Run 3 and trigger performance in 2022
The ATLAS trigger system is a crucial component of the ATLAS experiment at the LHC. It is responsible for selecting events in line with the ATLAS physics programme. This paper presents an overview of the changes to the trigger and data acquisition system during the second long shutdown of the LHC, and shows the performance of the trigger system and its components in the proton-proton collisions during the 2022 commissioning period as well as its expected performance in proton-proton and heavy-ion collisions for the remainder of the third LHC data-taking period (2022–2025)
Crop residue harvest for bioenergy production and its implications on soil functioning and plant growth: A review
Desenvolvimento das árvores em povoamentos monoespecíficos e mistos de eucalyptus urograndis e acacia mangium.
Em plantios florestais a deficiência nutricional, sobretudo N, é um dos principais fatores limitantes do crescimento das árvores em regiões tropicais (Bridges et al., 1997). A adição de N faz-se necessária para assegurar a produção sustentável das florestas plantadas, porém, os fertilizantes a base de N chegam com custo elevado no estado de Mato Grosso. A associação de árvores fixadoras de nitrogênio (AFN) e árvores não fixadoras de nitrogênio pode ser benéfico para a produção de biomassa do povoamento, especialmente em regiões de baixa fertilidade, por favorecer a ciclagem de nutrientes e disponibilizar nitrogênio para o sistema (Bouillet et al., 2013). A Acacia mangium é uma boa opção de AFN para ser consorciada com espécies de eucalipto. O fornecimento de N a partir da acácia para o eucalipto pode ocorrer rapidamente através de interações abaixo do solo ou a longo prazo a partir da decomposição da serapilheira e de resíduos culturais (Binkley et al., 2003; Forrester et al., 2006). Portanto, este estudo teve como objetivo avaliar variáveis dendrométricas, como o diâmetro a altura do peito (DAP) e a altura das árvores em plantios homogêneos e mistos de Eucalyptus urograndis e Acacia mangium aos 2,3 anos após o plantio, em Sinop, MT