oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Search Results: 1 - 10 of 4906 matches for " Mariano Bauer "
All listed articles are free for downloading (OA Articles)
Page 1 /4906
Display every page Item
A dynamical time operator in Dirac's relativistic quantum mechanics
Mariano Bauer
Physics , 2009, DOI: 10.1142/S0217751X14500365
Abstract: A self-adjoint dynamical time operator is introduced in Dirac's relativistic formulation of quantum mechanics and shown to satisfy a commutation relation with the Hamiltonian analogous to that of the position and momentum operators. The ensuing time-energy uncertainty relation involves the uncertainty in the instant of time when the wave packet passes a particular spatial position and the energy uncertainty associated with the wave packet at the same time, as envisaged originally by Bohr. The instantaneous rate of change of the position expectation value with respect to the simultaneous expectation value of the dynamical time operator is shown to be the phase velocity, in agreement with de Broglie's hypothesis of a particle associated wave whose phase velocity is larger than c. Thus, these two elements of the original basis and interpretation of quantum mechanics are integrated into its formal mathematical structure. Pauli's objection is shown to be resolved or circumvented. Possible relevance to current developments in interference in time, in Zitterbewegung like effects in spintronics, grapheme and superconducting systems and in cosmology is noted.
Measurement and Ergodicity in Quantum Mechanics
Mariano Bauer,Pier A. Mello
Mathematics , 2013,
Abstract: The experimental realization of successive non-demolition measurements on single microscopic systems brings up the question of ergodicity in Quantum Mechanics (QM). We investigate whether time averages over one realization of a single system are related to QM averages over an ensemble of similarly prepared systems. We adopt a generalization of von Neumann model of measurement, coupling the system to $N$ "probes" --with a strength that is at our disposal-- and detecting the latter. The model parallels the procedure followed in experiments on Quantum Electrodynamic cavities. The modification of the probability of the observable eigenvalues due to the coupling to the probes can be computed analytically and the results compare qualitatively well with those obtained numerically by the experimental groups. We find that the problem is not ergodic, except in the case of an eigenstate of the observable being studied.
A shell model mass formula for exotic light nuclei
Mariano Bauer,Hugo Garcia Tecocoatzi,Cristian Mojica
Physics , 2012,
Abstract: An analytic phenomenological shell model mass formula for light nuclei is constructed., The formula takes into account the non locality of the self consistent single particle potential and the special features of light nuclei, namely: a) charge and mass distributions are closer to a Gaussian shape than to the shape characteristic in medium and heavy nuclei; b) the central charge and mass densities are larger than, and decrease towards, the "asymptotic" values that are the reference parameters for nuclear matter; and c) after a shell closure, the next level has a larger orbital angular momentum and a noticeably larger mean square radius. Only then a good numerical fit is obtained with parameters consistent with optical model analysis and empirical spin-orbit couplings. A correlation between the "skin effect" and the symmetry dependence of the optical potential is established. Towards the neutron drip line the potential well depth, the spin-orbit splitting of the single particle levels and the gap between major shells decrease, as has been observed. The ensuing shift and contraction of the single particle level scheme may lead to: a) to strong configuration mixing and new magic numbers, and b) the onset of the halo effect, to avoid the expulsion of single particle levels to the continuum.
A New Approach to the Optimization of the CVRP through Genetic Algorithms  [PDF]
Mariano Frutos, Fernando Tohmé
American Journal of Operations Research (AJOR) , 2012, DOI: 10.4236/ajor.2012.24058
Abstract: This paper presents a new approach to the analysis of complex distribution problems under capacity constraints. These problems are known in the literature as CVRPs (Capacitated Vehicle Routing Problems). The procedure introduced in this paper optimizes a transformed variant of a CVRP. It starts generating feasible clusters and codifies their ordering. In the next stage the procedure feeds this information into a genetic algorithm for its optimization. This makes the algorithm independent of the constraints and improves its performance. Van Breedam problems have been used to test this technique. While the results obtained are similar to those in other works, the processing times are longer.
Vaccination against urinary tract infections caused by E. coli  [PDF]
Hartwig Wilhelm Bauer, Hira Shams, Ricarda Michaela Bauer
Advances in Bioscience and Biotechnology (ABB) , 2013, DOI: 10.4236/abb.2013.43A064
Abstract:

Uropathogenic Escherichia coli (UPEC) causes uncomplicated urinary tract infection (UTI) depicts a prevalent and potentially uncompromising infectious disease. In this analysis, we explained the functions of an immunoproteomics concept to vaccine development that has been successfully employed to recognize vaccine targets in other pathogenic bacteria. Pyelonephritis strains E. coli CFT073 are used for outer membrane isolation mimics urinary tract environment in which iron limitation, osmotic stress, human urine, and exposure to uroepithelial cells are included. During experiments of UTI, the antigens that induce the humoral immune response is to identified, two-dimensional gel electrophoresis are employed for the isolation of outer membrane protein and probed using pooled antisera from 20 CBA/J mice chronically infected with E. coli CFT073. 23 total outer membrane antigens, in which a unique iron compound receptor is included, are reacted with antisera and were identified by mass spectrometry. These antigens comprises of proteins with known functions in UPEC pathogenesis such as, ChuA, IroN, IreA, Iha, IutA, and FliC. These all information and data elaborate that these factors are associated with virulence during UTI are directed by antibody response. We also represents that the genes encoding ChuA, IroN, hypothetical protein c2482, and IutA are significantly more prevalent among UPEC strains than among fecal-commensal E. coli isolates. Therefore we concluded that, the outer membrane antigens are identified in this study are conserved, could be reflective part for the UTI vaccine generated to induce protective immunity against UPEC infections.

Towards Cloud Management by Autonomic Manager Collaboration  [PDF]
Omid Mola, Michael A. Bauer
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2011, DOI: 10.4236/ijcns.2011.432097
Abstract: The management of clouds comprised of hundreds of hosts and virtual machines present challenging problems to administrators in ensuring that performance agreements are met and that resources are efficiently utilized. Automated approaches can help in managing such environments. Autonomic managers using policy-based management can provide a useful approach to such automation. We outline how collections of collaborating autonomic managers in cloud can be a step towards better management of clouds. We describe how a hierarchy of policy-based autonomic managers can collaborate using messages. The messages and when to communicate is inferred automatically from the policies given to the managers. We evaluate the approach via a prototype inspired by a cloud virtualized infrastructure and show how collaboration between managers in a hierarchy can improve the response time of a web server and avoid service level agreement violations. Results of three different scenarios shows the importance of collaboration between managers at different authority levels and how this collaboration can help to increase efficiency of current infrastructures.
Forma??o continuada de professores e resultados dos alunos no SARESP: propostas e realiza??es
Bauer, Adriana;
Educa??o e Pesquisa , 2011, DOI: 10.1590/S1517-97022011000400009
Abstract: this work presents results of a study conducted between 2005 and 2006 entitled the use of the results of the saresp exam: the role of assessment in teacher education policies (uso dos resultados do saresp: o papel da avalia??o nas políticas de forma??o docente), whose purpose was to analyze possibilities and limits of the use of the results obtained by pupils in the saresp exam (school performance assessment system of the state s?o paulo) to formulate and direct teacher education policies. the attention was focused on education programs for teachers of portuguese language to pupils in fundamental education. four out of the thirteen regional education directorships of the state of s?o paulo were visited to gain acquaintance with the teacher education programs they developed and to investigate to what extent they could be related to the results achieved in the saresp exam. the qualitative study adopted as its main strategy the exploratory survey, with the use of semi-structured interview and observation scripts. the theoretical framework employed brought together contributions by dennis palumbo (1998) and marcus figueiredo and argelina figueiredo (1986) to understand the concept and stages of public policy, as well as by elba barreto and regina pinto (2001), blaine worthen, james sanders and jody fitzpatrick (2004), and by almerindo afonso (1998) on the discussion about assessment programs, among others. it concludes that, the statements in the teacher education program and in the saresp documentations about the correlation between the former and pupil assessment results notwithstanding, the actual achievement of positive results depends on the effective commitment of the professionals working at the education directorships. formal actions by the secretariat for education to foster this use of the results have proved insufficient to ensure the proposed link between pupil assessment and teacher education.
é possível relacionar avalia??o discente e forma??o de professores? A experiência de S?o Paulo
Bauer, Adriana;
Educa??o em Revista , 2012, DOI: 10.1590/S0102-46982012000200004
Abstract: taking the context of s?o paulo's educational policy, an attempt is made to relate teacher training programmes to the results of saresp (s?o paulo evaluation system of educational performance).this work is an extension of a theoretical analysis carried out in the author's original text, produced for a master's thesis, focusing on the relationship between saresp and educational, training programmes of the state. going on statements made in official documents, concerning the current understanding of the relationship between the two, one wonders to what extent it is relevant to design programs, and teachers' training activities, using student performance during assessments, as indicative of what teachers require.the conclusion is reached that this relationship is not straightforward, despite being defended within educational policies concerned with the streamlined management of the educational system. furthermore, the need for further discussion and studies on this coupling: teacher education/ performance of students results, is indicated.
A new solution algorithm for skip-free processes to the left
Bauer,Claus;
Cubo (Temuco) , 2010, DOI: 10.4067/S0719-06462010000200011
Abstract: this paper proposes a new solution algorithm for steady state models describing skip-free processes to the left where each level has one phase. the computational complexity of the algorithm is independent of the number of levels of the system. if the skip parameter of the skip-free process is significantly smaller than the number of levels of the system, our algorithm numerically outperforms existing algorithms for skip-free processes. the proposed algorithm is based on a novel method for applying generalized fibonacci series to the solution of steady state models.
In memory of Prof. Helena Ra ková, MD., DSc., Dr.h.c.
Viktor Bauer
Interdisciplinary Toxicology , 2010, DOI: 10.2478/v10102-010-0009-z
Abstract: On April 13, 2010, Prof. Helena Ra ková, MD, DrSc., Dr.h.c., the legendary figure of Czecho-Slovak and world pharmacology, passed away. She was born in 1913 in Laussane in a physician's family of a Czech father and Russian mother. She was predestinated for science even due to her childhood experience and meetings with A. Einstein and the later Nobel prize winner W. Hess, who played in a chamber quartet with her father. Moreover, she became a polyglot from the earliest time of her life (Czech from her father, Russian from her mother), Switzerdeutsch and Hochdeutsch from nursary rhymes, French in the elementary school in Zurich and basic English in convent summer school in Weymouth, where as she put it "she got an early lesson that one loves one's own country but is also a citizen of the world".
Page 1 /4906
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.