Search results for "FUNCTIONAL"
showing 10 items of 4822 documents
Asymmetric Synthesis of Amino-Bis-Pyrazolone Derivatives via an Organocatalytic Mannich Reaction.
2017
A new series of N-Boc ketimines derived from pyrazolin-5-ones have been used as electrophiles in asymmetric Mannich reactions with pyrazolones. The amino-bis-pyrazolone products are obtained in excellent yields and stereoselectivities by employing a very low loading of 1 mol % of a bifunctional squaramide organocatalyst. Depending on the substitution at position 4 of the pyrazolones, the new protocol allows for the generation of one or two tetrasubstituted stereocenters, including a one-pot version combing the Mannich reaction with a base-mediated halogenation. peerReviewed
Some approximation properties of ( p , q ) $(p,q)$ -Bernstein operators
2016
This paper is concerned with the $(p,q)$ -analog of Bernstein operators. It is proved that, when the function is convex, the $(p,q)$ -Bernstein operators are monotonic decreasing, as in the classical case. Also, some numerical examples based on Maple algorithms that verify these properties are considered. A global approximation theorem by means of the Ditzian-Totik modulus of smoothness and a Voronovskaja type theorem are proved.
Inferences on Sicilian Mesolithic subsistence patterns from cross-sectional geometry and entheseal changes
2020
International audience; Using cross-sectional geometry (CSG), entheseal changes (ECs), and presence of external auditory meatus exostosis (EAE), this study tests hypothesis-bases on isotopic and zooarchaeological evidence-that in the Sicilian Mesolithic terrestrial rather than marine resources were predominantly exploited, in substantial continuity with previous Epigravettian hunters. Results show similarities in the general frequency of ECs-a rough proxy for overall activity-with Late Pleistocene hunters, in contrast with Mesolithic coastal foragers or Neolithic herders/farmers. Yet, CSG suggests that this possible continuity in the type of resources exploited was accompanied by a behavior…
Differential Effects of Bilateral Norms on SMEs’ Export Relationships: A Dynamic Perspective
2017
Prior research has established the pivotal role of bilateral norms in relationship marketing, identifying them as effective relational governance mechanisms that firms can use to manage their international alliances with overseas intermediaries. Unfortunately, few studies have examined differential effects of specific norms on positive and negative behaviors, let alone norms’ effectiveness in the harsh export context of resource-constrained small and medium-sized enterprises (SMEs). To address these gaps, the authors explicate the effects of three norms (continuity expectations, equity, and cooperation) on both dysfunctional and productive behaviors of foreign distributors. Using two conse…
New approach to delay-dependent H∞ control for continuous-time Markovian jump systems with time-varying delay and deficient transition descriptions
2015
Abstract This paper proposes an input–output (IO) approach to the delay-dependent stability analysis and H ∞ controller synthesis for a class of continuous-time Markovian jump linear systems (MJLSs). The concerned systems are with a time-varying delay in the state and deficient mode information in the Markov stochastic process, which simultaneously involves the exactly known, partially unknown and uncertain transition rates. It is first shown that the original system with time-varying delay can be reformulated by a new IO model through a process of two-term approximation and the stability problem of the original system can be transformed into the scaled small gain (SSG) problem of the IO mo…
Probability Measures on Product Spaces
2020
In order to model a random time evolution, the canonical procedure is to construct probability measures on product spaces. Roughly speaking, the first step is to take a probability measure that models the initial distribution. In the second step, on a different probability space, the distribution after one time step is modeled. Then in each subsequent step, on a further probability space, the random state in the next time step given the full history is modeled. On a formal level, we consider products of probability spaces and Markov kernels between such spaces. Finally, the Ionescu-Tulcea theorem shows that the whole procedure can be realized on a single infinite product space. Furthermore,…
Simple Nuclear Structure inCd111–129from Atomic Isomer Shifts
2016
Isomer shifts have been determined in ^{111-129}Cd by high-resolution laser spectroscopy at CERN-ISOLDE. The corresponding mean square charge-radii changes, from the 1/2^{+} and the 3/2^{+} ground states to the 11/2^{-} isomers, have been found to follow a distinct parabolic dependence as a function of the atomic mass number. Since the isomers have been previously associated with simplicity due to the linear mass dependence of their quadrupole moments, the regularity of the isomer shifts suggests a higher order of symmetry affecting the ground states in addition. A comprehensive description assuming nuclear deformation is found to accurately reproduce the radii differences in conjunction wi…
The Knowledge as an instrument for recovery and valorize the rural architecture in Sicily. The masseria Pintorna S. Barbara in the mountain area of t…
2018
KNOWLEDGE FOR RECOVER AND VALORIZATION OF SICILIAN RURAL ARCHITECTURE The Pintorna S. Barbara farm in the Madonie mountain area The Pintorna S. Barbara farm located in the territory of Geraci Siculo (PA), a small rural village in the Madonie area, represents a relevant example of rural architecture for his constructive and typological aspects, but also for the potential that it offers in a project of compatible recover. In the same way of other farms that marks the sicilian territory, this one at the moment is in an abandonment state because of the absence of mainteinance during the last year so that it risks to be ruined. The study wants to evidence the principal materic contructive, funct…
The Dirichlet-Bohr radius
2015
[EN] Denote by Ω(n) the number of prime divisors of n ∈ N (counted with multiplicities). For x ∈ N define the Dirichlet-Bohr radius P L(x) to be the best r > 0 such that for every finite Dirichlet polynomial n≤x ann −s we have X n≤x |an|r Ω(n) ≤ sup t∈R X n≤x ann −it . We prove that the asymptotically correct order of L(x) is (log x) 1/4x −1/8 . Following Bohr’s vision our proof links the estimation of L(x) with classical Bohr radii for holomorphic functions in several variables. Moreover, we suggest a general setting which allows to translate various results on Bohr radii in a systematic way into results on Dirichlet-Bohr radii, and vice versa
L-fuzzy valued measure and integral
2012
Promocijas darbā mēra un integrāļa koncepcijas ir attīstītas L-kopu teori- jas kontekstā, kur L ir pilns, pilnīgi distributīvs režģis ar minimuma t-normu. Darba mērķis ir ieviest mēra un integrāļa jēdzienus gadījumā, kad ne tikai kopas, bet arī mēra un integrāļa vērtības ir L-nestriktas. Darbā ir izstrādā- tā vispārīgā shēma parasto kopu mēra turpinājumam līdz L-kopu mēram ar vērtībām L-nestriktajā reālajā taisnē. Ir definēts L-nestrikti vērtīgs integrālis pa mērojamu L-kopu pēc L-nestrikti vērtīga mēra, ir izpētītas tā īpašības un aprakstītas integrēšanas metodes. Izmantojot integrāli, ir uzdota L-nestrikti vērtīga norma, kura raksturo integrējamas funkcijas L-kopās. Ir aprakstīti daži L-n…