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Search Results: 1 - 10 of 6663 matches for " Alessandro Bagno "
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Through-Space Spin-Spin Coupling In Acetylenic Systems. Ab Initio and DFT Calculations
Alessandro Bagno,Girolamo Casella,Giacomo Saielli,Gianfranco Scorrano
International Journal of Molecular Sciences , 2003, DOI: 10.3390/i4040193
Abstract: coming soon
Observation of scalar nuclear spin-spin coupling in van der Waals molecules
Micah Ledbetter,Giacomo Saielli,Alessandro Bagno,Nhan Tran,Michael Romalis
Physics , 2011,
Abstract: Scalar couplings between covalently bound nuclear spins are a ubiquitous feature in nuclear magnetic resonance (NMR) experiments, imparting valuable information to NMR spectra regarding molecular structure and conformation. Such couplings arise due to a second-order hyperfine interaction, and, in principle, the same mechanism should lead to scalar couplings between nuclear spins in unbound van der Waals complexes. Here, we report the first observation of scalar couplings between nuclei in van der Waals molecules. Our measurements are performed in a solution of hyperpolarized ${\rm ^{129}Xe}$ and pentane, using superconducting quantum interference devices to detect NMR in 10 mG fields, and are in good agreement with calculations based on density functional theory. van der Waals forces play an important role in many physical phenomena, and hence the techniques presented here may provide a new method for probing such interactions.
Hispanismo en Rusia y en los Países del Este: Adonde va, de dónde viene
Bagno, Vsevolod
Arbor : Ciencia, Pensamiento y Cultura , 2001,
Abstract: Not available No disponible
Sign balance for finite groups of Lie type
Yona Cherniavsky,Eli Bagno
Mathematics , 2005,
Abstract: A product formula for the parity generating function of the number of 1's in invertible matrices over Z_2 is given. The computation is based on algebraic tools such as the Bruhat decomposition. The same technique is used to obtain a parity generating function also for symplectic matrices over Z_2. We present also a generating function for the sum of entries of matrices over an arbitrary finite field F_q calculated in F_q. These formulas are new appearances of the Mahonian distribution.
Congruence B-Orbits and the Bruhat Poset of Involutions of the Symmetric Group
Eli Bagno,Yonah Cherniavsky
Mathematics , 2009,
Abstract: We study the poset of Borel congruence classes of symmetric matrices ordered by containment of closures. We give a combinatorial description of this poset and calculate its rank function. We discuss the relation between this poset and the Bruhat poset of involutions of the symmetric group.
Colored-Descent Representations of Complex Reflection Groups G(r,p,n)
Eli Bagno,Riccardo Biagioli
Mathematics , 2005,
Abstract: We study the complex reflection groups G(r,p,n). By considering these groups as subgroups of the wreath products Z_r wr S_n, and by using Clifford theory, we define combinatorial parameters and descent representations of G(r,p,n), previously known for classical Weyl groups. One of these parameters is the flag major index, which also has an important role in the decomposition of these representations into irreducibles. A Carlitz type identity relating the combinatorial parameters with the degrees of the group, is presented.
Permutation representations on invertible matrices
Yona Cherniavsky,Eli Bagno
Mathematics , 2004,
Abstract: We discuss permutation representations which are obtained by the natural action of $S_n \times S_n$ on some special sets of invertible matrices, defined by simple combinatorial attributes. We decompose these representations into irreducibles. The multiplicities involved have a nice combinatorial interpretation. We also generalize known results on asymptotic behavior of the conjugacy representation of $S_n$.
On the excedance number of colored permutation groups
Eli Bagno,David Garber
Mathematics , 2005,
Abstract: We generalize the results of Ksavrelof and Zeng about the multidistribution of the excedance number of $S_n$ with some natural parameters to the colored permutation group and to the Coxeter group of type $D$. We define two different orders on these groups which induce two different excedance numbers. Surprisingly, in the case of the colored permutation group, we get the same generalized formulas for both orders.
Tarefas da educa o lingüística no Brasil
Marcos Bagno,Egon de Oliveira Rangel
Revista Brasileira de Linguística Aplicada , 2005,
Abstract: Com base no conceito de "educa o lingüística", os autores discutem a necessidade de atender às demandas sociais por essa educa o lingüística e definem as áreas de reflex o e atua o mais importantes para a implementa o de uma política de educa o lingüística no Brasil. Based on the concept of "linguistic education", the authors debate the need of responding to the social demands for this linguistic education and define the most important areas of reflection and action for the implementation of a politics of linguistic education in Brazil.
Research-design model for professional development of teachers: Designing lessons with physics education research
Bat-Sheva Eylon,Esther Bagno
Physical Review Special Topics. Physics Education Research , 2006,
Abstract: How can one increase the awareness of teachers to the existence and importance of knowledge gained through physics education research (PER) and provide them with capabilities to use it? How can one enrich teachers’ physics knowledge and the related pedagogical content knowledge of topics singled out by PER? In this paper we describe a professional development model that attempts to respond to these needs. We report on a study of the model’s implementation in a program for 22 high-school experienced physics teachers. In this program teachers (in teams of 5-6) developed during a year and a half (about 330 h ), several lessons (minimodules) dealing with a topic identified as problematic by PER. The teachers employed a systematic research-based approach and used PER findings. The program consisted of three stages, each culminating with a miniconference: 1. Defining teaching and/or learning goals based on content analysis and diagnosis of students’ prior knowledge. 2. Designing the lessons using PER-based instructional strategies. 3. Performing a small-scale research study that accompanies the development process and publishing the results. We describe a case study of one of the groups and bring evidence that demonstrates how the workshop advanced: (a) Teachers’ awareness of deficiencies in their own knowledge of physics and pedagogy, and their perceptions about their students’ knowledge; (b) teachers’ knowledge of physics and physics pedagogy; (c) a systematic research-based approach to the design of lessons; (d) the formation of a community of practice; and (e) acquaintance with central findings of PER. There was a clear effect on teachers’ practice in the context of the study as indicated by the materials brought to the workshop. The teachers also reported that they continued to use the insights gained, mainly in the topics that were investigated by themselves and by their peers.
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