Search results for "operation"
showing 10 items of 2969 documents
Isobaric Vapor−Liquid Equilibria for Binary and Ternary Mixtures with Cyclohexane, Cyclohexene, and 2-Methoxyethanol at 100 kPa
2009
Consistent vapor−liquid equilibria (VLE) data at 100 kPa have been determined for the ternary system cyclohexane + cyclohexene + 2-methoxyethanol and two constituent binary systems: cyclohexane + 2-methoxyethanol and cyclohexene + 2-methoxyethanol. Both binary systems deviate remarkably from ideal behavior presenting a minimum boiling point azeotrope. The VLE data have been correlated by the Wilson, UNIQUAC, and NRTL equations. The ternary system does not present an azeotrope and is well predicted from binary interaction parameters. Prediction with the UNIFAC method has been also obtained.
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.
The Opportunities of Cluster Development in Borderland of Poland and the Czech Republic
2016
The cluster was defined according to the definition proposed by M.E. Porter as a specialized concentration of mutually competing and cooperating enterprises which gives them the ability to generate and maintain a competitive advantage. The most important element of the cluster are geographically concentrated companies from a single industry. A concentration of enterprises aggravates their mutual competition in the markets and factors of production and simultaneously produces external effects which are beneficial for them - for example, a greater influx of innovative resources and staff necessary for the smooth running of the production process or provision of services in their industry. Pol…
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…
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 …
Operācijas laika ietekme uz apendektomijas rezultātu
2018
Kopsavilkums Nosaukums: Operācijas laika izvēles ietekme uz apendektomijas rezultātu Fons: Apendektomija ir viena no pasaulē visbiežāk veiktajām akūtajām ķirurģiskajām manipulācijām. Vēsturiski to veic nekavējoties un neatkarīgi no diennakts laika. Tomēr ir svarīgi jautāt, vai laika izvēle ietekmē klīnisko rezultātu. Mērķis: Pētījuma mērķis ir izvērtēt, vai apendektomiju ir iespējams aizkavēt vai arī tiešas ķirurģiskas iejaukšanās gadījumā rezultāts būs labāks. Materiāli un metodes: Šis ir retrospektīvs pētījums ar nejauši atlasītiem pacientiem ar apendektomiju, kas veikta Rīgas Austrumu klīniskajā universitātes slimnīcā 2015. un 2016. gadā. Vērtējuma parametri; vecums, dzimums, ķirurģiskai…