196,111 research outputs found
HILBERT-SPACE AND STRUCTURE CONSTANTS OF DESCENDANT FIELDS IN 2-DIMENSIONAL CONFORMAL THEORIES
No full textWe have developed an algorithm to compute the Hilbert-space basis and the operator algebra of descendant fields for (1 + 1)-dimensional conformal field theories. Implemented as a Mathematica computer program, this algorithm is used to obtain nonperturbatively the spectrum of the transfer matrix theories, seen as deformations of a massless conformal theory
THE SCALING REGION OF THE TRICRITICAL ISING-MODEL IN 2 DIMENSIONS
No full textWe study the scaling region spanned by all four relevant perturbations of the tricritical Ising model in two dimensions. We analyze the spectrum of the (1 + 1)-dimensional off-critical hamiltonian on a truncated Hilbert space, a method recently proposed by Yurov and Al. Zamolodchikov. In the phase coexistence regions the massive excitations are kink states. On the temperature-driven two-phase coexistence line, they form bound states, which we analyze for periodic as well as for twisted boundary conditions. We find a new asymmetric two-phase region driven by the subleading magnetic field. There are some indications of massless states along the crossover line to the Ising model. The effects of off-critical integrability on the spectra are also observed and discussed
A minimal stochastic model for influenza evolution
No full textWe introduce and discuss a minimal individual based model for influenza dynamics. The model takes into account the effects of specific immunization against viral strains, but also infectivity randomness and the presence of a short lived strain-transcending immunity recently suggested in the literature. We show by simulations that the resulting model exhibits substitution of viral strains along the years, but that their divergence remains bounded. We also show that dropping any of these features results in a drastically different behaviour, leading either to the extinction of the disease, to the proliferation of the viral strains or to their divergence
Unidentified employee of stone sculptor Oswald Lassig, at Administration Building, Rice Institute
No full textAn assistant to the sculptor and stone mason Oswald Lassig, posing in front of a column and surrounded by building materials and scaffolding during the construction of William M. Rice Institute’s Administration Building. He is wearing a suit and tie and a bowler hat. Original resource is a sepia photograph.Lassig was a sculptor who contributed to the architectural details in early Rice Institute buildings such as the Administration Building in 1911-1912, and Cohen House, 1927
Hybrid Flow Shop Management: Multi Objective Optimisation
No full textAbstract
The objectives of the optimisation management that considers both assembly and production Hybrid Flow-Shops lines are several: optimal numbers of machines, shifts, product priority and time-period scheduling. The approach uses a combination of DES software with an MDO (Multidisciplinary Design Optimization) software.. The DES model is optimized following the process: 1) A Multi-objective Genetic Algorithm cycle generates a set of optimal solutions; 2) A Clustering cycle groups the solutions into different sets; 3) The selection of the preferred solution via post-processing; 4) A mono-objective optimisation of each cluster; and 5) creation of weekly scheduling with optimal results. Finally, application and results are described and discussed
Evolutionary games and quasispecies
No full textWe discuss a population of sequences subject to mutations and frequency-dependent selection, where the fitness of a sequence depends on the composition of the entire population. This type of dynamics is crucial to understand, for example, the coupled evolution of different strands in a viral population. Mathematically, it takes the form of a reaction-diffusion problem that is nonlinear in the population state. In our model system, the fitness is determined by a simple mathematical game, the hawk-dove game. The stationary population distribution is found to be a quasispecies with properties different from those which hold in fixed fitness landscapes
Dr. Duane M. Jackson, Morehouse College, July 2011
No full textThis video is a conversation with Dr. Duane M. Jackson. Dr. Jackson talks about his paper, "Recall and the Serial Position Effect: The Role of Primacy and Recency on Accounting Students' Performance." Jackie Daniel, AUC Woodruff Library, is the interviewer
"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States" By M. Carey.
No full text"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States: containing bried sketches of the moral and political character of those states.
By M. Carey, member of the American philosophical, and of the American Antiquarian Society, and author of The Olive Branch, Cindiciae Hibernicae, essays on banking, on political economy, and on internal improvement.
To which are now added the English editor's comments on the subject; together with Important Advice to Emigrants, and Cautions Against Impositions Practiced in the Outports
- …
