196,808 research outputs found
Non-Chiral Pool Derived Synthetic Auxiliaries: Use of C2-Symmetric Chiral Diols
No full textSynthesis of enantiomerically pure compounds by the use of “man made” chiral inducers has the greatest potential for general asymmetric synthesis since, in principle, no limits exist in terms of their molecular design. This chapter covers the syntheses and uses of enantiopure 1,2- and 1,3-C2-symmetric diols as chiral inducers for diastereoselective reactions, as well as the prepa-ration and applications of the axially chiral 1,1′ binaphthalene-2,2′-diol (BINOL) structure and its derivatives. The interest for these “privileged ligands” is due to their peculiar steric and electronic properties, able to drive the stereochemical course of important chemical reactions in high levels of enantioselectivity
MATERIA (RECUPER)ABILE. Le imbarcazioni in legno veicolo di sostenibilità culturale e ambientale
No full textNell’ultimo ventennio le imbarcazioni da diporto in legno hanno gradualmente acquisito una dimensione “storica” che tende lentamente, ma progressivamente, ad avvicinarle al concetto di patrimonio culturale. In passato questi scafi, soprattutto quelli tradizionali, venivano dismessi e demoliti per essere sostituiti con unità nuove, sicuramente più aggiornate e performanti.
Oggi, grazie a una “felice” inversione di tendenza, le imbarcazioni in legno hanno conquistato una dignità nuova, sono oggetto di culto e popolano raduni nautici “dedicati” in tutto il Mediterraneo. Nei loro confronti sempre più spesso vengono attivate operazioni di recupero e restauro che ne esaltano gli antichi fasti e ne allungano il ciclo vita piuttosto che assistere inerti all’abbandono, alla dismissione o alla demolizione.
Questa tendenza, encomiabile nei confronti della tutela di un patrimonio nautico che altrimenti andrebbe distrutto, è anche realmente virtuosa (come potrebbe sembrare) nei confronti della sostenibilità, del riciclo, del riuso e del LCA?
Il presente saggio intende analizzare criticamente l’effettiva sostenibilità del legno come materiale per le costruzioni nautiche e il reale contributo alla sostenibilità ambientale dei processi di recupero e restauro delle unità storiche esistenti.
Maria Carola Morozzo della Rocca è autrice dei paragrafi: INTRODUZIONE, UN NUOVO INIZIO, COSTRUIRE O RECUPERARE UNA BARCA IN LEGNO, UNA PRATICA SOSTENIBILE?, pp 175-187.
Giulia Zappia è autrice dei paragrafi: LA CULTURA DEL RECUPERO DELLE IMBARCAZIONI COME ESTENSIONE DEL LCA, pp 187-195
Financial markets and Keynes's long-term expectations
No full textThis paper presents an intuitive way to represent Keynes's theory of expectations and its implications for financial markets. Further to a suggestion by Ellsberg, a coherent expectational function for the valuation of assets under Keynesian uncertainty is derived. By following the thread that goes from the non-numerical probabilities of the Treatise on Probability to the expectations of the General Theory, this paper suggests that a function accounting for Keynesian expectations can be modelled by using a class of the so-called ε-contaminated probability priors, where the parameter ε is suggestive of the quality of information about the relevant odds
A stereoselective synthesis of both enantiomers of emeriamine from a single precursor: L-aspartic acid
No full textShackle’s economic agent and modern decision theory
No full textThis paper assesses the rationale of George Shackle’s argument against Bayesian decision making in the light of recent developments of modern decision theory. The focus is on the so-called non-additive probability approach to decision theory under uncertainty, which, not unlike Shackle’s analysis, stresses the inability of agents to describe uncertain environments. A discussion of the pros and cons of the parallel between Shackle’s theory and the non-additive developments is provided
Probabilistic versus non-probabilistic decision making: Savage, Shackle and beyond
No full textThis paper discusses the evolution of decision theory after Savage’s Foundations. Two developments are examined. First, it is presented the rationale of Shackle’s proposal to abandon probabilistic decision making. Second, it is discussed the axiomatisation provided by the non-additive probability approach to account for the experimental evidence originated by the Ellsberg Paradox. An attempt is made to establish a connection between Shackle’s non-probabilistic instances and non-additive probabilistic decision making. The main outgrowth of the paper is that the similarities between the non-additive approach and Shackle’s theory are not limited to a number of methodological statements. In fact, it is also the formal measures used in the two contexts for representing individual preferences in uncertain environments that resemble each other
PREVALENCE OF ULTRASONOGRAPHIC LOWER AND UPPER ENTHESITIS IN PATIENTS WITH INFLAMMATORY BOWEL DISEASE
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