12,016 research outputs found
The multipliers of periodic points in one-dimensional dynamics
It will be shown that the smooth conjugacy class of an unimodal map which
does not have a periodic attractor neither a Cantor attractor is determined by
the multipliers of the periodic orbits. This generalizes a result by M.Shub and
D.Sullivan for smooth expanding maps of the circle
Density Induced Quantum Phase Transitions in Triplet Superconductors
We consider the possibility of quantum phase transitions in the ground state
of triplet superconductors where particle density is the tunning parameter. For
definiteness, we focus on the case of one band quasi-one-dimensional triplet
superconductors but many of our conclusions regarding the nature of the
transition are quite general. Within the functional integral formulation, we
calculate the electronic compressibility and superfluid density tensor as a
function of the particle density for various triplet order parameter symmetries
and find that these quantities are non-analytic when a critical value of the
particle density is reached.Comment: 4 pages, 3 figure
A renormalization fixed point for Lorenz maps
A Lorenz map is a Poincar\'e map for a three-dimensional Lorenz flow. We
describe the theory of renormalization for Lorenz maps with a critical point
and prove that a restriction of the renormalization operator acting on such
maps has a hyperbolic fixed point. The proof is computer assisted and we
include a detailed exposition on how to make rigorous estimates using a
computer as well as the implementation of the estimates.Comment: 29 pages, 2 figure
Topological insulator particles as optically induced oscillators: towards dynamical force measurements and optical rheology
We report the first experimental study upon the optical trapping and
manipulation of topological insulator (TI) particles. By virtue of the unique
TI properties, which have a conducting surface and an insulating bulk, the
particles present a peculiar behaviour in the presence of a single laser beam
optical tweezers: they oscillate in a plane perpendicular to the direction of
the laser propagation, as a result of the competition between radiation
pressure and gradient forces. In other words, TI particles behave as optically
induced oscillators, allowing dynamical measurements with unprecedented
simplicity and purely optical control. Actually, optical rheology of soft
matter interfaces and biological membranes, as well as dynamical force
measurements in macromolecules and biopolymers, may be quoted as feasible
possibilities for the near future.Comment: 6 pages, 5 figures. Correspondence and requests for Supplementary
Material should be addressed to [email protected]
Rendimento de espiga verde de milho em resposta à adubação nitrogenada.
O experimento foi executado, sob regime de sequeiro, em solo de textura média, no município de Teresina, PI, no período de janeiro a março de 2004. Utilizou-se o delineamento experimental de blocos casualizados com quatro repetições e cinco doses de nitrogênio (0, 50, 100, 150 e 200 kg de N ha-1). Foi observado efeito quadrático para o rendimento de espigas verdes com e sem palha sendo os máximos rendimentos (22.178 e 13.321 kg ha-1) obtidos com 108 e 125 kg de N ha-1, respectivamente. O aumento médio nos rendimentos de espigas verde com e sem palha devido ao nitrogênio foram de 32,4% e 35,3%.Edição dos Anais do 47° Congresso Brasileiro de Olericultura; 4º Simpósio Brasileiro sobre Cucurbitáceas, Porto Seguro, ago. 2007. 1 CD-ROM
Pulverizações foliares de cálcio em pessegueiros cultivados na Serra Gaúcha do Rio Grande do Sul e alterações no teor de nutrientes na folha, no fruto e rendimento.
bitstream/CNPUV/9556/1/cot081.pd
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