169,929 research outputs found
Cesarotti e van Goens. Un carteggio europeo
No full textIl contributo fa luce sul rapporto epistolare tra M. Cesarotti e il filologo olandese M.R. van Goens (in appendice alcune lettere di Cesarotti a van Goens che non figurano nell'epistolario ottocentesco del padovano)
A systemic approach to achieve operational excellence in hotel services
No full textPurpose: The purpose of the framework here proposed is to introduce an industrial culture within the service organizations. Concepts such as employees empowerment, ownership, continuous improvement, together with the systematic implementation of quantitative methods builds the organizational basis for achieving operational excellence in services, reducing costs and increasing service quality. This has been deployed in two phases: a “hard” phase to support the design of the service and the construction of tangible and intangible elements of the service, and a “soft” phase to support the management, maintenance and improvement of the service delivery. All this has been applied to the hotel service sector where the interaction between tangible and intangible elements of the service are particularly evident.
Methodology/approach: The framework uses and integrates several methodologies. Quality Function Deployment is largely used in order to support the “hard” phase of the framework. Kano’s model of customer requirements has been integrated in the Quality Function Deployment structure by means of an original method developed by the authors, introducing a so-called Non-Quality Priority Number (similar to the FMEA’s Risk Priority Number) that in combination with a so-called Quality Priority Number drives the decisions for improvement towards operational excellence. Moreover the “soft” phase of the framework introduces methods such as Failure Mode and Effect Analysis and Total Productive Maintenance in order to improve the service organization’s operational competence and culture, increasing at the same time the sense of ownership and the commitment for improvement of front line workers.
Findings: Through this paper it has been shown that industrial methods for operational excellence can be adapted and transferred to the service sector with a potential for significant improvements in particular for those services with a high degree of tangible factors. Allowing in this way to achieve outstanding results also without significant investments.
Research limitations/implications: This paper does not have the intention of describing the state of the art of service design and management, but rather it focuses on the transfer of industrial methods and techniques to the service sector.
Originality/value: The value of this paper is related to proposal of a global systemic approach to operational excellence in services, by means of which industrial methods for operational excellence are transferred to the service sector. Only few works in literature have tried to transfer industrial methods for operational excellence to services, however the main value of this paper is not – or not only – in the specific methods proposed, but in their integration in the systemic approach.
Keywords: Service operational excellence, Quality Function Deployment, Total Productive Maintenance, FMEA, commitment and empowerment, industrial culture transfer.
Paper type: Research Paper
ZedPhos Ru(II)/Diamine complexes in asymmetric reduction of carbonyl groups.
No full textThe asymmetric catalysis by transition metal complexes is recognized an alternative strategy for the preparation of compounds which were believed to be impossible to carry out by conventional methods. The greater part of the transition metals known as excellent catalysts for asymmetric synthesis have optically active diphosphine as source of chiality but in spite of the great variety of chiral ligands available, there is still demand for the development of catalysts which display the requirements of high enantioselectivity, diastereoselectivity and productivity in fine chemicals, fragrances, flavours, agrochemicals1.
We have recently prepared two ligands derived from chiral olefins in Z-geometry2, nicknamed ZedPhos by ourselves(a (R,R)-ZedPhos and b(R,R)-Xilyl ZedPhos).
We have investigated the stereodifferentiating ability of these ligands in Hydrogen Transfer (HT) and Asymmetric Hydrogenation (AH) of carbonyl compounds in the presence of achiral diamine (ampy), and chiral (R,R) or (S,S)-1,2-diphenyletylen diamine (DPEN). By comparison we have prepared the hydrogenated analogous3, (2R,5R) -2,5-bis(diphenylphosphino)hexane c, to investigate the possible fate of the the double bound on the ligand. e.e.% up to 82% was obtained in the reduction of acetophenone.
[1] H.U. Blaser, Asymmetric catalysis on industrial scale, E. SHMIDT Eds., 2004.
[2] Cesarotti, Edoardo; Rimoldi, Isabella; Spalluto, Paola; Demartin, Francesco. Chiral 1,4-bis-diphosphine ligands from optically active (Z)-olefins. Tetrahedron: Asymmetry 2007, 18(11), 1278-1283.
[3] Yan, Yuan-Yong; RajanBabu, T. V. Ligand substituent effects on asymmetric induction. Effect of structural variations of the DIOP ligand on the Rh-catalyzed asymmetric hydrogenation of enamides. Organic Letters 2000, 2(26), 4137-4140
Stereochemistry of substitution reactions at a chiral ruthenium atom: the crystal structure of (R)-[Ru(h5- C5H4R*)(CO)(PPh3)NCCH3]PF6(R* = neomenthyl)
No full textThe stereochemistry of substitution reactions of complexes of the type [Ru(η5-C5H4R*)(CO)(PPh3)L]n+ (R* = menthyl or R = neomenth n = 1, L = NCCH3 or NCCD3 has been studied by X-ray crystallography. Circular Dichroism and 1H, 13C and 31P NMR spectroscopy. All the reactions investigated have been unequivocably proved to occur with ≥ 94% retention of configuration at the ruthenium atom. Thus (S)-Ru(η5-C5H4R*)(CO)(PPh3)Cl reacts with NaI to give (R)-Ru(η5-C5H4R*)(CO)(PPh3)I (R* = menthyl or neomenthyl) and reaction of Ru(η5-C5H4R*)CO(PPh3)X (R*=menthyl, (S)Ru, X = Cl; R* = neomenthyl, (R)Ru, X = I) with AgY in acetonitrile yields the corresponding complex (R)-[Ru(η5- C5H4R*)(CO)(PPh3)(NCCH3)]Y (Y = PF6 or BF4). An X-ray structure determination of [Ru(η5-C5H4R*)(CO)(PPh3)NCCH3]PF6 (R* = neomenthyl) has confirmed that the absolute configuration of the ruthenium centre is R. The crystals are orthorhombic, space group P212121 (No. 19) with a 10.400(2), b 15.850(4), c 24.740(5) Å and Z = 4. The structure was solved via the heavy-atom method and refined to R = 0.036 using 4183 diffractometer data with I ≥ 1.56(I). CD3CN undergoes exchange with the coordinated acetonitrile in (R)-[Ru(C5H4R*)(CO)(PPh3)(NCCH3)]BF4 (R* = neomenthyl) with retention of configuration at ruthenium and reaction of (R)-[Ru(η5-C5H4R*)(CO)(PPh3)NCCD3]BF4 with NaI regenerates (R)-[Ru(η5-C5H4R*)(CO)(PPh3)I] (R* = neomenthyl)
Synthesis and stereochemical studies of the chiral ruthenium complexes [Ru(η-C5H5)(S)dpompyr-PP′X] [dpompyr = N-diphenylphosphino-2-(diphenylphosphinoxymethyl)pyrrolidine, X = H or Cl]. Crystal structure of [(S)Ru(η-C5H5)(S)dpompyr-PP′Cl]
No full textA simple procedure for the preparation of [(S)Ru(η-C5H5)(S)dpompyr-PP′H] [dpompyr = N-diphenylphosphino-2-(diphenylphosphinoxymethyl)pyrrolidine] from [Ru3(CO)12] is described. The hydride reacts stereospecifically with chloroform or carbon tetrachloride to give [(S)Ru(η-C5H5)(S)dpompyr-PP′Cl] whose structure is reported. The crystals are monoclinic, space group P21 with a = 11.076(2), b = 10.908(2), c = 12.825(3) Å, β = 92.26(2), and Z = 2. The structure was solved by the heavy-atom method and refined to R = 0.0322 using 2 306 diffractometer data with I > 3σ(I). Synthesis of this chloro-complex from [Ru(η-C5H5)(PPh3)2Cl] and (S)dpompyr proceeds with only modest diastereoselectivity whereas reduction of [(S)Ru(η-C5H5)(S)dpompyr-PP′Cl] using LiAlH4 regenerates 88% [(S)Ru(η-C5H5)(S)dpompyr-PP′H]. Mechanisms are proposed to explain the observed diastereoselectivities. Circular dichroism and 1H, 13C, and 31P n.m.r. spectra of all new compounds are also reported
A Service Operations Model for Public-Utilities to increase Corporate Social Responsibility
No full textIn the modern market one of the most upscale word is certainly “Sustainability”. Frequently enterprises promote sustainability just for advertisement, sometimes because they really believe in it and act for it. This paper concerns the study of public utilities and its position about sustainability. Analyzing the scientific debate concerning the public utilities companies business targets and their position about Corporate Social Responsibility, we want to show how CSR can be (in this sector) strategically and economically convenient. In the second part of the paper we will show how the focus on the public utility/citizen interface is essential to guarantee sustainability. Finally we will propose a model for Service Operations Management in public utilities customer service in order to optimize effectiveness and value creation in a sustainable way
Optically active complexes of Schiff bases. Part 6. Palladium(II) and platinum(II) complexes with quadridentate Schiff bases of salicylaldehyde
No full textThe synthesis and properties of palladium(II) and platinum(II) complexes with quadridentate Schiff bases derived from the condensation of salicylaldehyde and (R)-1,2-diamines are described. The ligand conformation of the platinum(II) complexes is discussed on the basis of the circular dichroism and the 1H n.m.r. spectra. The anomalous patterns of the circular dichroism spectra of palladium(II) derivatives are also reported
Proposal of an energy management maturity model to assess the progress achieved through mandatory energy audit application in the eu energy efficiency directive context
No full textIn the European scene, the promotion of energy efficiency is a key element of the community’s strategic effort. Among the binding measures established by the Energy Efficiency Directive of 2012 to foster this vision, the requirement for large companies to conduct energy audits with a four-years frequency was one of the most notable. Thus, following the receipt of the second round of energy audits reports, in December 2019, a new "photograph" of the energy situation of Italian companies has been made available. This presents the possibility, previously unavailable, of being able to compare the two situations reported in 2015 and 2019 in order to evaluate how the legislative obligation, and in particular the tool represented by mandatory energy audits, influenced the development of energy efficiency in the country. In order to do so, in collaboration with the Italian National Agency for Energy, a project has started with the objective to develop tools and methodologies necessary to evaluate in more detail the evolution that has taken place in the four years since 2015. In the present paper, a Maturity Model to assess the degree of progress achieved in the last four years in a company's energy management is presented. The model, realized after a comprehensive assessment of the scientific literature on this theme, comprises 5 maturity levels and 6 dimensions to cover all relevant aspects of energy management. The evaluation of the maturity level of the organization is achieved through a guided self-assessment conducted with a questionnaire of 48 questions. Moreover, through the use of the maturity model, an evaluation of the examined organization’s weaknesses and strengths is provided. In the next years, the model will be applied to a significant selection of Italian organizations in energyintensive industrial sectors
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