810 research outputs found
Body composition evaluated by skinfolds, bioimpedance and body mass index in adults
El objetivo de este estudio fue comparar la composición corporal por pliegues cutáneos (DC) por bioimpedancia eléctrica(BIA) y el índice de masa corporal(IMC). Se hizo un trabajo de campo con 153 militares usando los siguientes equipos: balanza Wiso; estadiómetro WCS; adipómetro Cescorf científico y Malton BF-900 para bioimpedancia eléctrica. La densidad corporal se consiguió por la ecuación de Jackson&Pollock y la clasificación delporcentaje de grasa corporal siguiendo Pollock&Wilmore. Para verificar la correlación se usó el test de Spearman. Los resultados promedios (± desviación estándar) hallados para edad, peso, estatura e IMC, fueron: 19 años (±1,8 años), 70,9Kg (±9,55), 1,74 metros (±0.06) y 23,9 kg/m² (±2,76) respectivamente. El porcentaje de grasa corporal por DC y BIA fueron respectivamente 12,78 (±5,45); 16,29 (±4,02). Concluí que la composición corporal por el método de DC, BIA e IMC presentó datos que se correlacionan, siendo que el uso de la bioimpedancia fue más indicada en grupos cuyo porcentaje de grasa corporal variaba entre 18-20%.The aim of this study was to compare body composition by skinfold thickness (DC) by bioelectrical impedance analysis (BIA) and body mass index (BMI). Research was carried out with 153 soldiers with the equipment: balance Wiso; WCS stadiometer; adipometer Cescorf Malton scientific and BF-900 to bioelectrical impedance analysis. Body density was obtained by the equation of Jackson&Pollock and classification of the percentage of fat by following Pollock&Wilmore. To check the correlation was used Spearman's test. The average results (±standard deviation) found for age, weight, height and BMI were: 19 years (±1.8years), 70.9 kg (±9.55), 1.74 meters (±0.06) and 23.9 kg/m² (±2.76), respectively. The fat percentage by BIA and DC were respectively 12.78 (±5.45) and 16.29 (±4.02). Concluded that body composition by the method of DC, BIA and BMI have data that correlate, and the use of bioimpedance was indicated in most groups whose fat percentage ranged around 18-20%.Gracias CAPES para la inversión financiera en forma de beca en el Programa de Posgrado en Ingeniería Eléctrica e Informática Industrial (CPGEI) de la Universidad Tecnológica Federal de Paraná (UTFPR)
Rotational Bands and Electromagnetic Transitions of some even-even Neodymium Nuclei in J-Projected Hartree-Fock Model
Rotational structures of even-even Nd nuclei are studied with the
self-consistent deformed Hartree-Fock (HF) and angular momentum (J) projection
model. Spectra of ground band, recently observed , and a few
more excited, positive and negative parity bands have been studied upto high
spin values. Apart from these detailed electromagnetic properties (like E2, M1
matrix elements) of all the bands have been obtained. There is substantial
agreement between our model calculations and available experimental data.
Predictions are made about the band structures and electromagnetic properties
of these nuclei. Some 4-qasiparticle K-isomeric bands and their electromagnetic
properties are predicted.Comment: 20 page
Recent Data to the Distribution of Western Corn Rootworm (Diabrotica virgifera virgifera LeConte) in Hungary
The Hungarian plant protection organization has been performing western corn rootworm moni- toring over the past four years.In 1998 three different trapping activities were carried out at 150 monitoring sites.Hungarian pheromone traps and Multigard ®(yellow sticky)traps were used from July 1 to September 30.The number of catches and the average catches/trap in 1998 were lower than the catch numbers in 1997. In 1998,the pest spread to a lesser degree than in 1997
Two- and three-body color flux tubes in the Chromo Dielectric Model
Using the framework of the Chromo Dielectric Model we perform an analysis of
color electric flux tubes in meson-like and baryon-like quark
configurations. We discuss the Abelian color structure of the model and point
out a symmetry in color space as a remnant of the SU(3) symmetry of QCD. The
generic features of the model are discussed by varying the model parameters. We
fix these parameters by reproducing the string tension MeV/fm and
the transverse width fm of the flux tube obtained in
lattice calculations. We use a bag constant MeV, a glueball
mass MeV and a strong coupling constant . We show that the asymptotic string profile of an infinitely long flux
tube is already reached for separations fm. A connection
to the Dual Color Superconductor is made by extracting a magnetic current from
the model equations and a qualitative agreement between the two descriptions of
confinement is shown. In the study of the system we observe a
-like geometry for the color electric fields and a
\textsf{Y}-like geometry in the scalar fields both in the energy density
distribution and in the corresponding potentials. The resulting total
potential is described neither by the -picture nor by the
\textsf{Y}-picture alone.Comment: 32 pages, 35 eps-figures, revised version, some references + 1
eps-file added, to be published in Phys.Rev.
Hypernetted-chain study of broken rotational symmetry states for the = 1/3 fractional quantum Hall effect and other fractionally filled Landau levels
We investigate broken rotational symmetry (BRS) states for the fractional
quantum Hall effect (FQHE) at 1/3-filling of the valence Landau level (LL).
Recent Monte Carlo calculations by Musaelian and Joynt [J. Phys.: Condens.\
Matter {\bf 8}, L105 (1996)] suggest that Laughlin's state becomes unstable to
a BRS state for some critical finite thickness value. We study in detail the
properties of such state by performing a hypernetted-chain calculation that
gives results in the thermodynamic limit, complementing other methods which are
limited to a finite number of particles. Our results indicate that while
Laughlin's state is stable in the lowest LL, in higher LLs a BRS instability
occurs, perhaps indicating the absence of FQHE at partial fillings of higher
LLs. Possible connections to the newly discovered liquid crystalline phases in
higher LLs are also discussed.Comment: 7 pages including 3 eps figure
Effects of mesonic correlations in the QCD phase transition
The finite temperature phase transition of strongly interacting matter is
studied within a nonlocal chiral quark model of the NJL type coupled to a
Polyakov loop. In contrast to previous investigations which were restricted to
the mean-field approximation, mesonic correlations are included by evaluating
the quark-antiquark ring sum. For physical pion masses, we find that the pions
dominate the pressure below the phase transition, whereas above T_c the
pressure is well described by the mean-field approximation result. For large
pion masses, as realized in lattice simulations, the meson effects are
suppressed.Comment: 11 pages, 4 figures; version accepted for publication in Yad. Fiz.,
text extended, 1 figure adde
Baryon Density and the Dilated Chiral Quark Model
We calculate perturbatively the effect of density on hadronic properties
using the chiral quark model implemented by the QCD trace anomaly to see the
possibility of constructing Lorentz invariant Lagrangian at finite density. We
calculate the density dependent masses of the constituent quark, the scalar
field and the pion in one-loop order using the technique of thermo field
dynamics. In the chiral limit, the pion remains massless at finite density. It
is found that the tadpole type corrections lead to the decreasing masses with
increasing baryon density, while the radiative corrections induce
Lorentz-symmetry-breaking terms. We found in the large limit with large
scalar mass that the tadpoles dominate and the mean-field approximation is
reliable, giving rise a Lorentz-invariant Lagrangian with masses decreasing as
the baryon density increases.Comment: Late
Influence of microwave annealing on GMI response and magnetization of an amorphous Fe73.5Nb3Cu1Si13.5B9 ribbon
The resistive and reactive components of magneto-impedance was studied for
the as-quenched and microwave annealed amorphous Fe73.5Nb3Cu1Si13.5B9 ribbon as
a function of biasing d.c magnetic fields (-60 to +60 Oe) and excitation
frequencies (0.1, 1, 10 and 20MHz). The magneto-impedance (both components)
response was much reduced for the microwave annealed ribbon and the changes
were more discernable at higher excitation frequencies. The imaginary component
of magneto-impedance showed maxima at finite (non-zero) d.c magnetic fields for
both the as-quenched and microwave annealed ribbons. Magnetization measurements
performed for both the as-quenched and microwave annealed ribbons revealed the
magnetic hardness of the latter. The initial susceptibility decreases by two
orders of magnitude for the microwave-annealed ribbon. XRD measurements
indicated the transformation of the surface of the ribbon from the amorphous
state to the crystalline one.Comment: 14 pages, 6 figure
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