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Search Results: 1 - 10 of 170 matches for " Kerson;Trevizan "
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Knowledge management in health: a systematic literature review
Rocha, Elyrose Sousa Brito;Nagliate, Patricia;Furlan, Claudia Elisangela Bis;Rocha Jr, Kerson;Trevizan, Maria Auxiliadora;Mendes, Isabel Amélia Costa;
Revista Latino-Americana de Enfermagem , 2012, DOI: 10.1590/S0104-11692012000200024
Abstract: knowledge has been used as a resource for intelligent and effective action planning in organizations. interest in research on knowledge management processes has intensified in different areas. a systematic literature review was accomplished, based on the question: what are the contributions of brazilian and international journal publications on knowledge management in health? the sample totaled 32 items that complied with the inclusion criteria. the results showed that 78% of journals that published on the theme are international, 77% of researchers work in higher education and 65% have a ph.d. the texts gave rise to five thematic categories, mainly: development of knowledge management systems in health (37.5%), discussion of knowledge management application in health (28.1%) and nurses' function in knowledge management (18.7%).
Protein Folding as a Physical Stochastic Process
Kerson Huang
Physics , 2007,
Abstract: We model protein folding as a physical stochastic process as follows. The unfolded protein chain is treated as a random coil described by SAW (self-avoiding walk). Folding is induced by hydrophobic forces and other interactions, such as hydrogen bonding, which can be taken into account by imposing conditions on SAW. The resulting model is termed CSAW (conditioned self-avoiding walk. Conceptually, the mathematical basis is a generalized Langevin equation. In practice, the model is implemented on a computer by combining SAW and Monte Carlo. To illustrate the flexibility and capabilities of the model, we consider a number of examples, including folding pathways, elastic properties, helix formation, and collective modes.
An Asymptotically Free Phi4 Theory
Kerson Huang
Physics , 1993,
Abstract: The Phi4 theory in 4-epsilon dimensions has two fixed points, which coincide in the limit epsilon->0. One is a Gaussian UV fixed point, and the other a non-trivial IR fixed point. They lead to two different continuum field theories. The commonly adopted IR theory is ``trivial,'' behaves like perturbation theory, and suggests an upper bound on the Higgs boson mass. The UV theory is asymptotically free, and does not impose a bound on the Higgs mass. The UV continuum limit can also be reached in 4 dimensions with momentum or lattice cutoff.
A Critical History of Renormalization
Kerson Huang
Physics , 2013, DOI: 10.1142/S021775X13300500
Abstract: The history of renormalization is reviewed with a critical eye, starting with Lorentz's theory of radiation damping, through perturbative QED with Dyson, Gell-Mann & Low, and others, to Wilson's formulation and Polchinski's functional equation, and applications to "triviality", and dark energy in cosmology.
Growth-Collapse Cycles of a Bose-Einstein Condensate with Attractive Interactions
Kerson Huang
Physics , 2001,
Abstract: A Bose-Einstein condensate of atoms with attractive interactions exhibits growth and collapse cycles, when it is fed by a thermal cloud. Recently this phenomenon has been directly observed in a trapped Li-7 gas. We offer a quantitative explanation of the data, on the basis of a model proposed earlier. It is shown that the condensate wave function acquires a chaotic component after the first collapse, indicating superfluid turbulence.
CSAW: a dynamical model of protein folding
Kerson Huang
Physics , 2006,
Abstract: CSAW (conditioned self-avoiding walk) is a model of protein folding that combines SAW (self-avoiding walk) with Monte-Carlo. It simulates the Brownian motion of a chain molecule in the presence of interactions, both among chain residues, and with the environment. In a first model that includes the hydrophobic effect and hydrogen bonding, a chain of 30 residues folds into a native state with stable secondary and tertiary structures. The process starts with a rapid collapse into an intermediate "molten globule", which slowly decays into the native state afer a relatively long quiescent period. The behavior of the radius of gyration mimics experimental data.
Cold Trapped Atoms: A Mesoscopic System
Kerson Huang
Physics , 2000,
Abstract: The Bose-Einstein condensates recently created in trapped atomic gases are mesoscopic systems, in two senses: (a) Their size fall between macroscopic and microscopic systems; (b) They have a quantum phase that can be manipulated in experiments. We review the theoretical and experimental facts about trapped atomic gases, and give examples that emphasize their mesoscopic characters. One is the dynamics of collapse of a condensate with attractive interactions. The other is the creation of a 1D kink soliton that can be used as a mode-locked atom laser.
Methods for a Nonuniform Bose Gas
Kerson Huang,Paolo Tommasini
Physics , 1996,
Abstract: We review mathematical methods for the treatment of a system of Bose particles with nonuniform density. Common pitfalls are pointed out.
Fate of a Bose-Einstein condensate with attractive interaction
Masahito Ueda,Kerson Huang
Physics , 1998, DOI: 10.1103/PhysRevA.60.3317
Abstract: We calculate the decay amplitude of a harmonically trapped Bose-Einstein condensate with attractive interaction via the Feynman path integral. We find that when the number of particles is less than a critical number, the condensate decays relatively slowly through quantum tunneling. When the number exceeds the critical one, a "black hole" opens up at the center of the trap, in which density fluctuations become large due to a negative pressure, and collisional loss will drain the particles from the trap. As the black hole is fed by tunneling particles, we have a novel system in which quantum tunneling serves as a hydrodynamic source.
Fixed-Point Structure of Scalar Fields
Kenneth Halpern,Kerson Huang
Physics , 1994, DOI: 10.1103/PhysRevLett.74.3526
Abstract: We search for alternatives to the trivial $\phi^4$ field theory by including arbitrary powers of the self-coupling. Such theories are renormalizable when the natural cutoff dependencies of the coupling constants are taken into account. We find a continuum of fixed points, which includes the well-known Gaussian fixed point. The fixed point density has a maximum at a location corresponding to a theory with a Higgs mass of approximately 2700 GeV. The Gaussian fixed point is UV stable in some directions in the extended parameter space. Along such directions we obtain non-trivial asymptotically free theories.
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