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showing 10 items of 3606 documents
Isobaric Vapor−Liquid Equilibria for Binary and Ternary Mixtures of Ethanol, Methylcyclohexane, and p-Xylene
2004
Consistent vapor−liquid equilibria (VLE) were determined for the ternary system ethanol + methylcyclohexane + p-xylene and the three binary subsystems at 101.3 kPa at temperatures in the range from 345 to 408 K. The binary systems exhibit positive deviation from ideal behavior, and the system ethanol + methylcyclohexane presents a minimum-boiling-point azeotrope. The VLE data have been correlated by the Wilson, NRTL, and UNIQUAC equations. The ternary system does not present an azeotrope and is well predicted from binary interaction parameters.
1990
Intrinsic viscosities, [η], second virial coefficients, A2, and interaction potentials, g12, for the ternary systems alcohol (1)/3-heptanone (2)/poly(1-vinyl-2-pyrrolidone) (3), with the unbranched alcohols methanol, ethanol and 1-propanol, were determined at 25°C. Taking into account the dependence of the viscometric interaction parameter, B, with the molecular weight of the polymer, the unperturbed dimensions parameter, KΘ, of the polymer was unambiguously obtained. Relationships between ΔKΘ (defined as ΔKΘ = ΔK − KΘ) and excess Gibbs energies, GE, and between excess viscosity, Δ[η], and GE allow to obtain equations relating A2 to ΔKΘ or to Δ[η]. Therefore, A2 can be evaluated from experi…
ChemInform Abstract: Ternary Complexes of Cimetidine and Phenobarbital with Cu(II) in Methanolic Solution.
1986
The formation constants of the binary complexes Cu(CM)2+ and Cu(CM) 2 2+ as well as those of the ternary complexes Cu(CM)L + and Cu(CM)2 L + (CM=Cimetidine=N-Cyano-N′-methyl-N″[(5-methyl-1H-imidazol-4-yl)methyltioethyl]-guanidine; HL=Phenobarbital=5-ethyl-5-phenyl-barbituric acid) have been determined in 0.1 and 1.0 mol dm−3 NaClO4 methanol solutions at 25±0.2°C. The values of logX, log βstat.., and Δ logK confirm the stability of the ternary complexes.
Ternary complexes of cimetidine and phenobarbital with Cu(II) in methanolic solution
1986
The formation constants of the binary complexes Cu(CM)2+ and Cu(CM) 2 2+ as well as those of the ternary complexes Cu(CM)L + and Cu(CM)2 L + (CM=Cimetidine=N-Cyano-N′-methyl-N″[(5-methyl-1H-imidazol-4-yl)methyltioethyl]-guanidine; HL=Phenobarbital=5-ethyl-5-phenyl-barbituric acid) have been determined in 0.1 and 1.0 mol dm−3 NaClO4 methanol solutions at 25±0.2°C. The values of logX, log βstat.., and Δ logK confirm the stability of the ternary complexes.
La catena del valore nelle organizzazioni produttive di servizi. Il capitale sociale della città
2005
The urban unity-difference, formed of the social community interacting with the human, natural and constructed environments, produces private and social values or benefits. Interactions among the "services supplying urban firm" and the social, economic and natural environments produce value flows that dinamically form and exchange in the value chain. The New Economics approach is used to analyze the functioning principles of such a kind of value chain. Moreover, the application of a multicriterial operational model for the valuation of variations of social capital produced by every kind of private o public "firm-market system" is outlined. The subject is rilevant: in the public decisional c…
Flipped learning e gioia del lavoro ben fatto. Una ricerca con i futuri docenti di scuola primaria e dell'infanzia
2019
La formazione iniziale degli insegnanti richiede un approccio sistemico e modelli formativi per la promozione di interventi finalizzati a favorire negli studenti la consapevolezza del valore dello studio in un quadro orientato a favorire i risultati della formazione così come definiti dai Descrittori di Dublino e a sostenere l'apprendimento responsabile dello studente. La promozione della qualità della didattica universitaria ha come scopo fondamentale quello di garantire agli studenti un apprendimento significativo ed efficace. Initial teacher training requires a systemic approach and training models for the promotion of interventions aimed at encouraging students to evaluate the value of …
Co-produzione di valore nei servizi museali e performance multidimensionali: un approccio dinamico a supporto del management culturale
2021
Contesto della ricerca: nei piccoli centri urbani la co-produzione di servizi museali può essere una leva per la generazione di valore pubblico. Obiettivi del paper: lo scritto mira ad illustrare come un approccio multidimensionale di performance governance sia in grado di offrire una prospettiva sistemica per l’identificazione degli outcome gestionali, organizzativi e di comunità nonché di evidenziare leve per il miglioramento dei processi di generazione di valore nei musei e a beneficio della comunità. Metodologia: dapprima si è proceduto alla revisione della letteratura sul tema della co-produzione di servizi pubblici. Per analizzare le performance di tali contesti collaborativi si è cos…
El empleado como recurso operante en la cocreación de valor: aplicación al ámbito de salud
2023
En el contexto sanitario actual, la investigación de la cocreación de valor desde la perspectiva del marketing ha experimentado un aumento sostenido. Frow et al. (2016) destacan que la atención sanitaria representa un contexto de servicio importante para investigar la cocreación de valor debido al reconocimiento generalizado de la importancia de las actividades colaborativas entre los diversos actores en la obtención de resultados beneficiosos para la salud. Si bien la participación del paciente en el proceso de cocreación de valor ha recibido una considerable atención en la literatura reciente, la cocreación liderada por los empleados está notoriamente ausente. Sin embargo, Palumbo (2016) …
The on-demand warehousing problem
2022
Warehouses are key elements of supply chain networks, and great attention is paid to increase their efficiency. Highly volatile space requirements are enablers of innovative resource sharing concepts, where warehouse capacities are traded on online platforms. In this context, our paper introduces the on-demand warehousing problem from the perspective of platform providers. The objective prioritises demand–supply matching with maximisation of the number of transactions. If there is a tie, the secondary objective maximises the number of suppliers matched with at least one customer and the number of customers that have matches within a specific threshold with respect to the minimum achievable …
L'assignatura de Comerç Internacional: des de la teoria fins la pràctica
2010
En este artículo proponemos una práctica empírica para la asignatura de Comercio Internacional con la que los estudiantes puedan manejar estadísticas de comercio y acercarse así a la realidad del comercio mundial. El objetivo de la práctica es doble: por un lado, el estudiante aprende a interpretar y aplicar algunas teorías de comercio, extrayendo hipótesis contrastables empíricamente; por otro lado, se enfrenta a datos reales de comercio que debe tratar estadísticamente a fin y efecto de contrastar la validez de las predicciones teóricas