3,365 research outputs found
Risk factor control in hypertensive and diabetic subjects attended by the Family Health Strategy in the State of Pernambuco, Brazil : the SERVIDIAH study = Controle dos fatores de risco em hipertensos e diabéticos acompanhados pela Estratégia Saúde da Família no Estado de Pernambuco, Brasil : estudo SERVIDIAH
The SERVIDIAH study (Evaluation of Health Services for Diabetic and Hypertensive Subjects) was conducted in 2010 in the State of Pernambuco, Brazil. A multi-stage random sample of 785 hypertensive and 823 diabetic patients was drawn from 208 Family Health Strategy (FHS) units selected throughout 35 municipalities. Patients underwent a structured interview and weight, height, blood pressure and HbA1c levels (for diabetic patients) were measured. Mean age was approximately 60 years, and women were overrepresented in the sample (70%). 43.7% of hypertensive subjects and 25.8% of diabetic subjects achieved adequate blood pressure control and 30.5% of diabetic subjects had HbA1c levels below 7%. Despite 70% of the patients being overweight or obese, few had adhered to a weight-loss diet. The study of this representative sample of hypertensive and diabetic patients attended by the FHS in the State of Pernambuco shows that improvements in the management of hypertension and diabetes are needed in order to prevent the occurrence of serious and costly complications, especially given the context of increasing incidence of these two conditions
Fractional transport equations for Levy stable processes
The influence functional method of Feynman and Vernon is used to obtain a
quantum master equation for a Brownian system subjected to a Levy stable random
force. The corresponding classical transport equations for the Wigner function
are then derived, both in the limit of weak and strong friction. These are
fractional extensions of the Klein-Kramers and the Smoluchowski equations. It
is shown that the fractional character acquired by the position in the
Smoluchowski equation follows from the fractional character of the momentum in
the Klein-Kramers equation. Connections among fractional transport equations
recently proposed are clarified.Comment: 4 page
Anatase crystals of unusual habit in quartz veins from the Diamantina region (Espinhaço Range, Minas Gerais)
Modelagem da transferência das pressões aplicadas na superfície de um argissolo do tabuleiros costeiros.
O horizonte subsuperficial coeso dos Argissolos de Tabuleiros Costeiros, reduz a profundidade efetiva desses solos, comprometendo a produtividade e longevidade das lavouras de culturas perenes. Essa limitação pedogenética pode ser potencializada quando a pressão aplicada na superfície do horizonte Ap, durante o tráfego de máquinas agrícolas é transmitida para horizontes mais profundos, AB ou Bt, em níveis superiores a capacidade de suporte de carga dessas camadas. Objetivou-se com esta pesquisa modelar matematicamente a transferência de pressões aplicadas à superfície do horizonte Ap de um Argissolo para camadas subsuperficiais buscando relacionar a pressão aplicada com a umidade do perfil de solo. Com o experimento desenvolvido no laboratório de Solos e Nutrição de Plantas da Embrapa Tabuleiros Costeiros, concluiu-se que a umidade apresenta efeito de amortecimento sobre a pressão transmitida de camadas superiores para subsuperfície. A pressão transmitida para subsuperfície apresenta comportamento exponencial com correlação negativa em função da profundidade, independente da pressão aplicada na superfície. O aumento da área de contato para aplicação de pressões na superfície do solo, atenua a transmissão de pressão para camadas inferiores, quando é comparado à mesma pressão aplicada em áreas menores
Transport properties of one-dimensional interacting fermions in aperiodic potentials
Motivated by the existence of metal-insulator transition in one-dimensional
non-interacting fermions in quasiperiodic and pseudorandom potentials, we
studied interacting spinless fermion models using exact many-body Lanczos
diagonalization techniques. Our main focus was to understand the effect of the
fermion-fermion interaction on the transport properties of aperiodic systems.
We calculated the ground state energy and the Kohn charge stiffness Dc. Our
numerical results indicate that there exists a region in the interaction
strength parameter space where the system may behave differently from the
metallic and insulating phases. This intermediate phase may be characterized by
a power law scaling of the charge stiffness constant in contrast to the
localized phase where Dc scales exponentially with the size of the system.Comment: 11 pages LaTex document with 5 eps figures. Uses revtex style file
Gravitational stability and dynamical overheating of stellar disks of galaxies
We use the marginal stability condition for galactic disks and the stellar
velocity dispersion data published by different authors to place upper limits
on the disk local surface density at two radial scalelengths .
Extrapolating these estimates, we constrain the total mass of the disks and
compare these estimates to those based on the photometry and color of stellar
populations. The comparison reveals that the stellar disks of most of spiral
galaxies in our sample cannot be substantially overheated and are therefore
unlikely to have experienced a significant merging event in their history. The
same conclusion applies to some, but not all of the S0 galaxies we consider.
However, a substantial part of the early type galaxies do show the stellar
velocity dispersion well in excess of the gravitational stability threshold
suggesting a major merger event in the past. We find dynamically overheated
disks among both seemingly isolated galaxies and those forming pairs. The ratio
of the marginal stability disk mass estimate to the total galaxy mass within
four radial scalelengths remains within a range of 0.4---0.8. We see no
evidence for a noticeable running of this ratio with either the morphological
type or color index.Comment: 25 pages, 5 figures, accepted to Astronomy Letter
Landau model for uniaxial systems with complex order parameter
We study the Landau model for uniaxial incommensurate-commensurate systems of
the I class by keeping Umklapp terms of third and fourth order in the expansion
of the free energy. It applies to systems in which the soft mode minimum lies
between the corresponding commensurate wave numbers. The minimization of the
Landau functional leads to the sine-Gordon equation with two nonlinear terms,
equivalent to the equation of motion for the well-known classical mechanical
problem of two mixing resonances. We calculate the average free energies for
periodic, quasiperiodic and chaotic solutions of this equation, and show that
in the regime of finite strengths of Umklapp terms only periodic solutions are
absolute minima of the free energy, so that the phase diagram contains only
commensurate configurations. The phase transitions between neighboring
configurations are of the first order, and the wave number of ordering goes
through harmless staircase with a finite number of steps. These results are the
basis for the interpretation of phase diagrams for some materials from the I
class of incommensurate-commensurate systems, in particular of those for
ABX and BCCD compounds. Also, we argue that chaotic barriers which
separate metastable periodic solutions represent an intrinsic mechanism for
observed memory effects and thermal hystereses.Comment: 12 pages, 14 figures, LaTeX, to be published in Phys. Rev.
Utilização de inoculantes e adubação nitrogenada relacionado ao rendimento e qualidade de grãos de soja.
O nitrogênio (N) é o nutriente essencial para a cultura da soja, podendo ser fornecido para a cultura através de bactérias do gênero Bradyrhizobium, presente em inoculantes. Mundialmente, a soja é o principal produto para produção de óleos e ração para animais, desta forma a qualidade dos grãos produzidos é extremamente importante. Assim, objetivou-se com este estudo, determinar: rendimento e propriedades físicas e fisiológicas de grãos, em função da utilização de diferentes tipos de inoculantes e adubação nitrogenada, na soja transgênica e convencional. Utilizou-se delineamento de blocos em acaso com duas cultivar, quatro repetições e testados quatro tratamentos: inoculante turfoso, líquido, adubação com N mineral e sem inoculante e fertilizante nitrogenado. Os resultados demostram que a inoculação de soja com inoculantes líquidos e turfosos, proporcionou aumento na produtividade de grãos. Em produtividade, a cultivar convencional superou a cultivar transgênica. Para soja convencional o inoculante turfoso mostrou-se eficiente, uma vez que foi constatada uma maior massa de 1.000 grãos e maior massa especifica real. Já o inoculante líquido apresentou valores elevados quando avaliado na soja transgênica, pois obteve maiores valores para massas especifica aparente e real, número de grãos germinados no teste de germinação e no teste de envelhecimento acelerado
Boolean dynamics revisited through feedback interconnections
Boolean models of physical or biological systems describe the global dynamics of the system and their attractors typically represent asymptotic behaviors. In the case of large networks composed of several modules, it may be difficult to identify all the attractors. To explore Boolean dynamics from a novel viewpoint, we will analyse the dynamics emerging from the composition of two known Boolean modules. The state transition graphs and attractors for each of the modules can be combined to construct a new asymptotic graph which will (1) provide a reliable method for attractor computation with partial information; (2) illustrate the differences in dynamical behavior induced by the updating strategy (asynchronous, synchronous, or mixed); and (3) show the inherited organization/structure of the original network’s state transition graph.publishe
Interacting particles at a metal-insulator transition
We study the influence of many-particle interaction in a system which, in the
single particle case, exhibits a metal-insulator transition induced by a finite
amount of onsite pontential fluctuations. Thereby, we consider the problem of
interacting particles in the one-dimensional quasiperiodic Aubry-Andre chain.
We employ the density-matrix renormalization scheme to investigate the finite
particle density situation. In the case of incommensurate densities, the
expected transition from the single-particle analysis is reproduced. Generally
speaking, interaction does not alter the incommensurate transition. For
commensurate densities, we map out the entire phase diagram and find that the
transition into a metallic state occurs for attractive interactions and
infinite small fluctuations -- in contrast to the case of incommensurate
densities. Our results for commensurate densities also show agreement with a
recent analytic renormalization group approach.Comment: 8 pages, 8 figures The original paper was splitted and rewritten.
This is the published version of the DMRG part of the original pape
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