221 research outputs found
Alternativas al entrenamiento tradicional para combatir la obesidad en escolares: entrenamiento concurrente polarizado
With this work we want to show another type of training different from the traditional recommendations that from the most influential organizations (ACSM-American College Sports Medicine, WHO-World Health Organization and AHA-American Heart Association) do to make the training more effective in light of the latest studies on Physical Activity (PA) and Health.The concurrent training (strength-resistance) combined with a work of polarized intensity (high and low) produces better results for the fight of obesity than the isolated work of both and submaximal intensities as it had been working in the most classic protocols.Con este trabajo queremos poner de manifiesto otro tipo de entrenamiento distinto a las recomendaciones tradicionales que desde las organizaciones más influyentes (ACSM-American Collegue Sport Medicine, WHO-World Health Organization y AHA-American Heart Association) hacen para que el entrenamiento sea más efectivo a la luz de los Ăşltimos estudios sobre Actividad FĂsica (AF) y salud.El entrenamiento concurrente (fuerza-resistencia) unido con un trabajo de intensidad polarizada (alta y baja) produce mejores resultados para la lucha de la obesidad que el trabajo aislado de ambas y de intensidades submáximas como se venĂa trabajando en los protocolos más clásicos
Potential of a new strain of Bacillus amyloliquefaciens BUZ-14 as a biocontrol agent of postharvest fruit diseases
The biocontrol potential of the Bacillus amyloliquefaciens strain BUZ-14 was tested against the main postharvest diseases of orange, apple, grape and stone fruit. After characterizing the temperature and pH growth curves of strain BUZ-14, its in vitro antifungal activity was determined against Botrytis cinerea, Monilinia fructicola, M. laxa, Penicillium digitatum, P. expansum and P. italicum. Subsequently, in vivo activity was tested against these pathogens by treating fruit with cells, endospores and cell-free supernatants. The in vitro results showed that BUZ-14 inhibited the growth of all the pathogens tested corresponding to the least susceptible species, P. italicum, and the most susceptible, M. laxa. In vivo tests corroborated these results as most of the treatments decreased the incidence of brown rot in stone fruit from 100% to 0%, establishing 107 CFU mL-1 as the minimum inhibitory concentration. For the Penicillium species a preventive treatment inhibited P. digitatum and P. italicum growth in oranges and reduced P. expansum incidence in apples from 100% to 20%. Finally, it has been demonstrated that BUZ-14 was able to survive and to control brown rot in peaches stored at cool temperatures, making it a very suitable biocontrol agent for application during the post-harvest storage and marketing of horticultural products
Experimental Test of a Two-dimensional Approximation for Dielectric Microcavities
Open dielectric resonators of different shapes are widely used for the
manufacture of microlasers. A precise determination of their resonance
frequencies and widths is crucial for their design. Most microlasers have a
flat cylindrical geometry, and a two-dimensional approximation, the so-called
method of the effective index of refraction, is commonly employed for numerical
calculations. Our aim has been an experimental test of the precision and
applicability of a model based on this approximation. We performed very
thorough and accurate measurements of the resonance frequencies and widths of
two passive circular dielectric microwave resonators and found significant
deviations from the model predictions. From this we conclude that the model
generally fails in the quantitative description of three-dimensional dielectric
resonators.Comment: 10 pages, 13 figure
Las TIC como herramientas didácticas para el profesorado de educaciĂłn fĂsica en la formaciĂłn reglada utilizando el modelo Flipped Classroom
ICTs are tools present in our life's areas, the rise of which has led to their introduction in the educational curriculum and in teaching as a key and indispensable part of it. Thanks to scientific advancement, performance measurement devices are becoming more frequent and easy to use by professionals in physical activity and sports. Therefore, the present work aims to make a didactic proposal based on the use of ICT as a methodological strategy and tool for assessing and implementing training programs within the curricular framework of the educational stage Professional Training of the Higher Technician in Physical Conditioning. This proposal will consist of seven sessions for the subject of "Assessment of the physical condition and intervention in accidents" where they will handle digital tools that favor developing their objectives and skills and integration into the professional market.Las TIC son una herramienta presente en todos los ámbitos de nuestra vida, cuyo auge ha provocado su introducciĂłn en el currĂculum educativo y en las enseñanzas como una pieza clave e indispensable del mismo. Gracias al avance cientĂfico, el uso de dispositivos para la mediciĂłn del rendimiento es cada vez más frecuente y fácil de usar por parte de profesionales de la actividad fĂsica y del deporte. Por eso, el presente trabajo tiene como objetivo realizar una propuesta didáctica basada en el uso de las TIC como estrategia metodolĂłgica y herramienta para la valoraciĂłn y realizaciĂłn de programas de entrenamiento dentro del marco curricular de la etapa educativa FormaciĂłn Profesional del TĂ©cnico Superior en Acondicionamiento FĂsico. Esta propuesta estará compuesta por siete sesiones para la asignatura de “ValoraciĂłn de la condiciĂłn FĂsica e intervenciĂłn en accidentes” donde manejarán herramientas digitales que favorezcan el desarrollo de sus objetivos y competencias e integraciĂłn en el mercado profesional
Casimir-Polder interaction of atoms with magnetodielectric bodies
A general theory of the Casimir-Polder interaction of single atoms with
dispersing and absorbing magnetodielectric bodies is presented, which is based
on QED in linear, causal media. Both ground-state and excited atoms are
considered. Whereas the Casimir-Polder force acting on a ground-state atom can
conveniently be derived from a perturbative calculation of the atom-field
coupling energy, an atom in an excited state is subject to transient force
components that can only be fully understood by a dynamical treatment based on
the body-assisted vacuum Lorentz force. The results show that the
Casimir-Polder force can be influenced by the body-induced broadening and
shifting of atomic transitions - an effect that is not accounted for within
lowest-order perturbation theory. The theory is used to study the
Casimir-Polder force of a ground-state atom placed within a magnetodielectric
multilayer system, with special emphasis on thick and thin plates as well as a
planar cavity consisting of two thick plates. It is shown how the competing
attractive and repulsive force components related to the electric and magnetic
properties of the medium, respectively, can - for sufficiently strong magnetic
properties - lead to the formation of potential walls and wells.Comment: 16 pages, 6 figures, minor additions and correction
Selective Reflection Spectroscopy on the UV Third Resonance Line of Cs : Simultaneous Probing of a van der Waals Atom-Surface Interaction Sensitive to Far IR Couplings and of Interatomic Collisions
We report on the analysis of FM selective reflection experiments on the
6S1/2->8P3/2 transition of Cs at 388 nm, and on the measurement of the surface
van der Waals interaction exerted by a sapphire interface on Cs(8P3/2). Various
improvements in the systematic fitting of the experiments have permitted to
supersede the major difficulty of a severe overlap of the hyperfine components,
originating on the one hand in a relatively small natural structure, and on the
other hand on a large pressure broadening imposed by the high atomic density
needed for the observation of selective reflection on a weak transition. The
strength of the van der Waals surface interaction is evaluated to be 7310
kHz.m3. An evaluation of the pressure shift of the transition is also
provided as a by-product of the measurement. We finally discuss the
significance of an apparent disagreement between the experimental measurement
of the surface interaction, and the theoretical value calculated for an
electromagnetic vacuum at a null temperature. The possible influence of the
thermal excitation of the surface is evoked, because, the dominant
contributions to the vW interaction for Cs(8P3/2) lie in the far infrared
range.Comment: submitted to Laser Physics - issue in the memory of Herbert Walther
Doctor, how much weight will I lose? - a new individualized predictive model for weight loss
Bariatric surgery is an effective treatment for weight loss, but the patient’s ability to reach a sustained weight loss depends upon several technical and individual factors. Creating an easy model that adapts bariatric surgery’s weight loss goals for each patient is very important for pre-surgery and follow-up evaluations.info:eu-repo/semantics/publishedVersio
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