Search results for "porat"
showing 10 items of 1595 documents
Formation of micro- and nano-spheric particles (filter dust) during the preparation of cellulose acetate membranes
2003
Abstract Membranes were prepared from six samples of cellulose acetate (CA) differing in their average molecular weight (75–260 kg/mole) and molecular weight distribution using methyl acetate as solvent and 2-propanole as precipitant. The routes through the phase diagram and the evaporation times were varied in these experiments. Electron microscopy demonstrates that the amount of filter dust (CA particles deposited on the membrane surface) decreases as the fraction of low molecular weight material in the starting polymer becomes less. For low average molar mass of CA and moderate polymer concentrations in the casting solution the dust consists of individual spheres of relatively uniform si…
Preferential evaporation of precipitants from polymer solutions in mixed solvents
2000
Partial vapor pressures were measured for the volatiles of solutions of polysulfone or polyethersulfone in mixtures of N,N-dimethylformamide (DMF, solvent) and water or acetone (precipitants) by means of headspace gas chromatography. The results demonstrate that the enrichment of water in the gas phase increases exponentially with rising polymer concentration, in contrast to that of acetone which remains constant. The reinforced expulsion of water resulting from the presence of polymers is theoretically conceivable and should be useful in the field of separation techniques.
Guest-Induced Folding and Self-Assembly of Conformationally Adaptive Macrocycles into Nanosheets and Nanotubes
2017
A conformationally adaptive macrocycle is presented, namely zorb[4]arene, which exists in multiple conformations in the uncomplexed state. The binding cavity of zorb[4]arene is concealed, either due to a collapsed conformation or by self-inclusion. The zorb[4]arene with long alkyl chains manifests itself with surprisingly low melting point and thus exist as an oil at room temperature. Binding of a guest molecule induces the folding and conformational rigidity of zorb[4]arene and leads to well-defined three-dimensional structures, which can further self-assemble into nanosheets or nanotubes upon solvent evaporation, depending on guest molecules and the conformations they can induce.
Giant Crown-Shaped Polytungstate Formed by Self-Assembly of CeIII-Stabilized Dilacunary Keggin Fragments
2010
Single crystals of Na40K6[Ni(H2O)6]3 [K@K7Ce24Ge12W120O456 (OH)12(H2O)64]· 178H2O are synthesized by addition of KCl to a NaOAc/AcOH buffer solution containing Ce(NO3)3, GeO2, Na2WO4, and NiCl2 followed by slow evaporation at room temperature (24% yield).
ChemInform Abstract: Giant Crown-Shaped Polytungstate Formed by Self-Assembly of CeIII-Stabilized Dilacunary Keggin Fragments.
2011
Single crystals of Na40K6[Ni(H2O)6]3 [K@K7Ce24Ge12W120O456 (OH)12(H2O)64]· 178H2O are synthesized by addition of KCl to a NaOAc/AcOH buffer solution containing Ce(NO3)3, GeO2, Na2WO4, and NiCl2 followed by slow evaporation at room temperature (24% yield).
Per una teoria delle società di capitali come entità reali: a proposito di un recente libro di Eva Micheler
2022
This paper reviews, for an Italian readership, a book by Eva Micheler that is titled "Company law. A Real Entity Theory".
LE SANZIONI PER LE PERSONE GIURIDICHE NEI SISTEMI DI RESPONSABILITÀ DA REATO: SPUNTI DI CONFRONTO FRA SUD-AMERICA ED EUROPA
2019
The analysis of the sanctions for corporate criminal liability is conducted in a comparative perspective on two-fold level and scope. In the first place, the study consider the sanctions adopted in South-American jurisdictions which have introduced such responsibility, especially in the last twenty years, based on the UN instruments to contrast transnational organised crime and corruption. Then, the study will move to a parallel overview of the sanctions of EU jurisdictions. The analysis highlights analogies and differences both between the national systems from both contexts and between the two groups of jurisdictions. Overall, a process of ‘weak harmonisation’ is traced between the consid…
I compensi degli amministratori: analisi della disclosure nei bilanci delle società italiane quotate
2012
This paper analyses the disclosure on the directors’ remuneration, whose primary role in a company, makes their information of particular interest to different stakeholders. The authors’ aim is to investigate the official documents (for 2009) of the 50 most capitalized listed Italian companies, in order to verify the compulsory and/or voluntary disclosure provided about the remuneration paid to their directors. The findings will be summarized in a disclosure index whose correlation with some parameters (selected on the basis of specific research hypothesis) concerning board structure and company size will be assessed.
Improving the Quality of the Comply or Explain Approach and Introducing Self-Monitoring Through Online Feedbacks
2017
Codes of corporate governance and comply or explain approach are always at the core of the European Union agenda. This paper will deal both with the evolution of codes of corporate governance across Europe, and with the 2014 Recommendation. The idea put forwards is that regulators, at both EU and national level, should mainly improve the environment where the comply or explain approach is applied and introduce a system of self-monitoring through online feedbacks only. Arguably, this proposal might offer Member States a light-touch way to comply with Art. 11 of the 2014 Recommendation laying down that “[i]n order to motivate companies to comply with the relevant corporate governance code or …
eWOM sobre Responsabilidad Social Corporativa: su efecto sobre la utilidad percibida, la influencia percibida y la equidad de la marca de los destino…
2017
Desde la línea del Comportamiento del Consumidor y de la aproximación de la Sustentabilidad Corporativa, esta tesis analizó la influencia que ejerce la comunicación boca-oído electrónica (eWOM) de la Responsabilidad Social Corporativa (RSC) sobre la utilidad percibida del eWOM (UP), la influencia percibida del eWOM (IP) y la equidad de marca basada en el consumidor (EMBC), considerando en el estilo del eWOM los argumentos sobre las dimensiones ambiental, económica y sociocultural de la RSC y los tipos de contenido emocional y racional. Para lograr este propósito se desarrollaron dos etapas de investigación. En la etapa exploratoria se estudió el estilo del eWOM de los destinos turísticos (D…