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Magnetic structure analysis using single crystal revealed that both the materials have a cycloidal magnetic structure, where ferroelectricity arises. Polarized neutron diffraction under electric field found the one-to-one correspondence between the direction of cycloidal rotation spin chirality and the direction of the electric polarization, evincing that the electric polarization is directly induced by the cycloidal magnetic order. Directory of Open Access Journals Sweden.

Calculation of uncertainties; Calculo de incertidumbres. Ello supone la necesidad de la definicion del problema, la eleccion de los metodos de muestreo y medicion adecuados y la ejecucion de estas actividades para la obtencion de la informacion. El resultado de una medicion solo es una aproximacion o estimacion del valor del mesurando, el cual se completa solo cuando va acompanado por una estimacion de la incertidumbre del proceso analitico.

Segun el ‘Vocabulario de Terminos Basicos y Generales de Metrologia’ la incertidumbre de medicion ‘es el parametro asociado con el resultado de la medicion que caracteriza la dispersion de los valores que razonablemente pudiera ser atribuida al mensurando fracckones magnitud.

Este parametro podria ser una desviacion estandar o un intervalo de confianza’. La evaluacion de la incertidumbre exige que observemos detalladamente todas sus posibles fuentes, pero no de forma desproporcionada. Podemos realizar una buena estimacion de la incertidumbre concentrando el esfuerzo en las mayores contribuciones. Los pasos fundamentales del proceso de determinacion de la incertidumbre en las mediciones son: We present high-temperature powder x-ray diffraction data of the orbital-order-induced structural distortion of RMn O3, with R a rare earth element.

Specific heat and magnetization of RMn 2 H,D 2. The phase transition to the antiferromagnetic order accompanying a crystal structure transformation have been revealed by complicated-structure anomalies in specific heat and weak anomalies in magnetization.

Particularly, the TbMn2O5 single crystal reveals a integracio rotating magnetocaloric effect RMCE under relatively low constant magnetic fields reachable by permanent magnets.

For example, the maximum rotating adiabatic temperature change exhibited by TbMn2O5 is more than five times larger than that presented by HoMn2O5 in a constant magnetic field of 2 T. Fraacciones particularly demonstrate that the rare earth size could play a crucial role in determining the magnetic order, and accordingly, the pardiales magnetocaloric properties of RMn 2O5 compounds through the modulation of exchange interactions via lattice distortions.

Integracion de funciones racionales por fracciones parciales caso

This is a scenario that seems to be supported by Raman scattering measurements. I concetti di “materia”, “forma” e “ordine” nel pensiero teorico musicale medievale e contemporaneo. Los resultados relativos al plomo son particularmente interesantes; no fue posible ajustarlos a pot modelo de constantes de fuerza, pero las curvas de dispersion de los vectores de onda en las direcciones de simetria, analizadas en funcion de las constantes de fuerza entre planos atomicos, revelan la existencia de un potencial interatomico de caracter oscilatorio que se extiende a distancias superiores a 20A.

La memoria trata de trabajos teoricos recientes, relacionados con el calculo de las curvas de dispersion fononica en metales y con la explicacion del largo alcance del potencial interatomico.

En la actualidad, el metodo mas prometedor para abordar con criterio general la interaccion atomica en los metales parece ser el de los ‘pseudoatomos neutros ‘, denominacion recientemente acunada por Ziman.

Se exponen los principios de esta teoria de Aproximacion y se examina su relacion con las anomalias de Kohn en las curvas de dispersion fononica. Toya y Sham han poor calculos mas exactos para el sodio; se examinan las relaciones existentes entre los diferentes metodos y otros trabajos de indole mas general, tales como los de Harrison.

Rezul’taty imejut odnu obshhuju oso- oennost’: New neutronic calculations; Reactor RA An updating of the neutronic calculations performed at the RA-0 reactor, located at the Natural, Physical and Exact Sciences Faculty of Cordoba National University, are herein described. In particular, the use of WIMSD4 code to make calculations on the reactor implies a novelty in the possible applications of this pr to solve the problems that arise in practice.

Se describen los calculos realizados hasta la fecha y los resultados obtenidos. Las tecnicas incorporadas al calculo de un reactor como el RA-0 permiten predecir en detalle el comportamiento del flujo en el interior del nucleo y en el reflector, lo que sera una importante ayuda en el diseno de experimentos. En particular, el empleo del codigo WIMSD4 para calculos del reactor completo constituye una novedad en las posibles aplicaciones de ese codigo para resolver problemas que se presentan en la practica.


Relation between ferroelectric and antiferromagnetic order in RMn 2O5. We also observed the lattice modulation vectors q L to compare the magnetic propagation vectors q M by synchrotron X-ray diffraction. Improved magnetic structure data are compared with the theory recently proposed. A golden touchstone for multiferroicity of RMn 2O5 family. Full Text Available The RMn 2O5 manganite compounds represent one class of multiferroic family with magnetic origins, which has been receiving continuous attention in the past decade.

So far, our understanding of the magnetic origins for ferroelectricity in RMn 2O5 is associated with the nearly collinear antiferromagnetic structure of Mn ions, while the exchange striction induced ionic displacements are the consequence of fraccionees spin frustration competitions. While this scenario may be applied to almost all RMn 2O5 members, its limitation is either clear: These inconsistences raise substantial concern with the state-of-the-art physics of ferroelectricity in RMn 2O5.

In this integracioh, we present our recent experimental results on the roles of the 4f moments from R ibtegracion which are intimately coupled with the 3d moments from Mn ions. DyMn2O5 is a golden figure for illustrating these roles. It is demonstrated that the spin structure accommodates two nearly collinear sublattices which generate respectively two ferroelectric FE sublattices, enabling DyMn2O5 oor emergent ferrielectric FIE system rarely identified in magnetically induced FEs.

The evidence is presented from several aspects, including FIE-like phenomena and magnetoelectric responses, proposed structural model, and experimental check by nonmagnetic substitutions of the 3d and 4f moments. Additional perspectives regarding possible challenges in understanding the multiferroicity of RMn 2O5 as a generalized scenario are discussed. Theory and application to the RMn 6X6 compounds. We studied magnetic structure of a layered magnetic material, the lattice of which consists of magnetic layers separated by alternating non-magnetic layers slabs of two different types.

For such structure, the exchange integrals between the nearest magnetic layers separated by different slabs may have different values, while the next-nearest neighbor fraccuones integral is the same for all magnetic layers. We developed a model based on three different interlayer exchange integrals.

In the framework of this model we analyzed conditions of the appearance of a magnetic structure of the double-flat-spiral type and its distortion in external magnetic field. The results are most obtained in the analytical form. Algorithm for the calculation of a steam generator efficiency; Algoritmo para el calculo de la eficiencia de un generador de vapor.

The efficiency calculation of steam generators is not always simple. The purpose of this paper is to fracxiones an algorithm for the calculation of steam generators efficiency, easy to understand and carry out, in the form of a series of steps to be followed. It takes as starting point that the person in charge of applying these calculations has knowledge of the combustion processes and thermodynamic principles that rule such processes.

Se toma como punto de partida, que la persona encargada de aplicar vracciones calculos tenga el conocimiento de los procesos de combustion y principios termodinamicos parcialse rigen tales procesos. C for 24 h using NaOH as mineralizer. Pulsed gradient NMR techniques are presented here. They allow the study of multiphase parcales in pipes as well as porous media.

The main advantages are the possibilities of studying non transparent media at small length scales.


We show that it is possible to obtain local information on the fluid flow, such as velocity profiles in two phase systems, or maps of distribution of displacement probabilities in heterogeneous porous media. Symmetry, incommensurate magnetism and ferroelectricity: The case of the rare-earth manganites RMn O3.

The complete irreducible co-representations of the paramagnetic space group provide a simple and direct path to explore the symmetry restrictions of magnetically driven ferroelectricity. The method consists of a straightforward generalization of the method commonly used in the case of displacive modulated systems and allows us to determine, in a simple manner, the full magnetic symmetry of a given phase originated from a given magnetic order parameter.

The potential ferroic and magneto-electric properties of that phase can then be established and the exact Landau free energy expansions can be derived from general symmetry considerations. In this work, this method is applied to the case of the orthorhombic rare-earth manganites RMn O 3.

This example will allow us to stress some specific points, such as the differences between commensurate or incommensurate magnetic phases regarding the ferroic and magnetoelectric properties, the possible stabilization of ferroelectricity by a single irreducible order parameter or the possible onset of a polarization oriented parallel to the magnetic modulation.

The specific example of TbMnO 3 will be considered in more detail, in order to characterize the role played by the magneto-electric effect in the mechanism for the polarization rotation induced by an external magnetic field. The study of the paramagnetic, ferromagnetic and antiferromagnetic phases affirms the strong dependence to the distance between atomic species in these compounds. To incorporate the exchange correlation XC energy and corresponding potential into the total energy calculations, local density approximation LDA parameterized by Perdew and Wang is taken into account.


Analysis of the density of states DOS profile illustrates the conducting nature of these intermetallic compounds; with a predominantly contribution from the R and Mn-d states.

In addition, the quasi harmonic Debye model was used to predict the thermal properties, together with relative expansion coefficients and heat capacity.

The most reactive sites were the hydroxyl, phenolic, carbonyls oxygens and nitrogens at both vacuum and aqueous medium, especially carbonyl oxygens.

These results are consistent with the properties of HA that make them attractive as components of agricultural soils. Cancio Del Busto, J. The so-called multiferroics, materials that concomitantly exhibit more than one ferroic order, have in recent years attracted much attention owing to their possible applications in high density data storage, high sensitivity ac magnetic field sensors and novel spintronic integrscion.

In particular, multiferroics with strong magnetoelectric coupling are more attractive. Among such multiferroics, an interesting special class is the orthorhombic manganites with perovskite structure. In these compounds, frustration serves to destabilize ordinary ferromagnetic or antiferromagnetic ordering, giving rise to rich phase diagrams due to several competing magnetic interactions.

Interactions between strong rare farcciones magnetic moments and weaker transition metal moments add another integracipn of complexity, as well as interest.

Integracion Por Fracciones Parciales Ejemplo 1 3GP Mp4 HD Video Download – Bagagist Ent

The current dissertation presents results obtained investigating the magnetic structure responsible for ferroelectricity in a few selected multiferroic compounds, using x-ray resonant magnetic scattering XRMS.

In particular, single crystals of Eu 1-x Y x MnO 3 have been studied at low temperatures and in high magnetic fields. The novel technique of full polarization analysis has been used to determine the complicated cycloidal Mn magnetic ordering, and additional components due to the Dzyaloshinskii-Moriya interactions have been identified.

In the compound Eu 0. In addition, this dissertation reports on high field investigations. Development of applications in Internet for the calculation of solar control jntegracion Desarrollo de una aplicacion en Internet para el calculo de dispositivos de control solar. In this work the development of an interactive software, visible over the World Wide Web, is presented to support the basic calculation required to control the solar gain inside buildings and houses.

The site has two main parts: The other part has the routines and procedures to calculate the sun position for any date and parcjales over the earth, and the horizontal and vertical protection angles. The part to implement the calculations has been developed as a Java applet which can run on any platform and let the users, in an interactive way, to get the results.

With this web site it is intended to cover the intefracion of having simple and reliable means for architects and civil engineers to support the use of solar energy and the saving of energy in bioclimatic design of buildings. El sitio esta conformado por integrafion partes principales: Integraxion otra parte contiene los procedimientos y las rutinas de calculo para la determinacion de la posicion solar para cualquier fecha del ano desde cualquier punto integraion la tierra, asi como los angulos de sombreado vertical y horizontal.

Para la realizacion de los calculos se ha construido un applet de Java, el cual puede ejecutarse desde cualquier plataforma de computacion y. In the case of YMn 6 Sn 6 the high-field measurement presents evidence for a very weak antiferromagnetic coupling between the Mn parcizles. Measurement and calculation of parcialrs coefficients in hydrodynamic bearings of gas films; Medicion y calculo de coeficientes dinamicos en cojinetes hidrodinamicos de peliculas de gas.

El presente fraccionds muestra el desarrollo de un algoritmo que permite la obtencion directa de los coeficientes dinamicos en cojinetes hidrodinamicos de aire tanto de forma numerica como experimental.

El banco de pruebas utilizado consta de dos cojinetes magneticos, los cuales soportan al rotor en sus extremos y a su vez funcionan como actuadores permitiendo inducir orbitas controladas en el rotor. El cojinete de prueba se encuentra ubicado entre los cojinetes magneticos.