Naturally Graded 2-Filiform Leibniz Algebras

The Leibniz algebras appear as a generalization of the Lie algebras [8]. The classification of naturally graded p-filiform Lie algebras is known [3], [4], [5], [9]. In this work we deal with the classification of 2-filiform Leibniz algebras. The study of p-filiform Leibniz non Lie algebras is solved for p = 0 (trivial) and p = 1 [1]. In this work we get the classification of naturally graded non Lie 2-filiform Leibniz algebras

Brain morphometry in Florida kids in relations with some parameters of the growth

Se determinan los datos de peso, volumen y medidas lineales de los encéfalos de 44 cabritos (22 hembras y 22 machos) de raza Florida. Se valoran la diferencias encontradas según el sexo, la edad y el peso, así como las principales correlaciones entre los parámetros controlados

Naturally graded quasi-filiform Leibniz algebras

AbstractThe classification of naturally graded quasi-filiform Lie algebras is known; they have the characteristic sequence (n−2,1,1) where n is the dimension of the algebra. In the present paper we deal with naturally graded quasi-filiform non-Lie–Leibniz algebras which are described by the characteristic sequence C(L)=(n−2,1,1) or C(L)=(n−2,2). The first case has been studied in [Camacho, L.M., Gómez, J.R., González, A.J., Omirov, B.A., 2006. Naturally graded 2-filiform Leibniz Algebra and its applications, preprint, MA1-04-XI06] and now, we complete the classification of naturally graded quasi-filiform Leibniz algebras. For this purpose we use the software Mathematica (the program used is explained in the last section)

Out-of-plane constraint loss in three point bend specimens with notches

ABSTRACT: This paper presents an experimental and numerical study of the effect of specimen thickness on the effective notch toughness for cleavage fracture measured using Single Edge Notch Bend (SENB) specimens containing a U-notch instead of a fatigue pre-crack. These specimens are typically used to measure a material's effective notch toughness and to assess failure of a structure containing a non-sharp defect using the Notch Failure Assessment Diagram (NFAD). Both the experimental data and the Finite Element (FE) failure predictions show a significant influence of specimen thickness on , over and above the microstructural weakest link effect arising from differences in the volume of the plastic zone. is a function of not only the in-plane effect of the notch radius, but also an out-of-plane constraint loss which itself is enhanced by the presence of the notch radius. Significant out-of-plane constraint loss occurred for notched specimens with a ratio of thickness to width of 0.5, a geometry that if pre-cracked would have met the minimum thickness requirement mandated by ASTM E1820. Doubling the thickness to = 1.0 was sufficient to eliminate the out-of-plane constraint loss. The use of experimentally measured values in an NFAD assessment of a structure may therefore be non-conservative if <1.0.This paper is published with the permission of Wood, the University of Cantabria, and the UK Atomic Energy Authority. The authors of this work would like to express their gratitude for financial support from: - The Spanish Ministry of Science and Innovation, under project MAT2014-58443-P: “Análisis del comportamiento en fractura de componentes estructurales con defectos en condiciones debajo confinamiento tensional”, on which the results of this paper are based; - Wood, via a contribution to the R6 Development Programme; - The Research Councils UK (RCUK) Energy Programme [grant number EP/P012450/1]

Electronic susceptibilities in systems with anisotropic Fermi surfaces

The low temperature dependence of the spin and charge susceptibilities of an anisotropic electron system in two dimensions is analyzed. It is shown that the presence of inflection points at the Fermi surface leads, generically, to a $T \log T$ dependence, and a more singular behavior, $\chi \sim T ^{3/4} \log T$, is also possible. Applications to quasi two-dimensional materials are discussed.Comment: 8 pages, 5 figures, revtex 4 styl

Web-based HMI for renewable energies microgrid through Grafana environment

[EN] Smart Grids and Microgrids require continuous monitoring and visualization of the operational state of its generation and consumption equipment. The use of Internet of Things (IoT) technology for monitoring purposes can solve limitations of traditional solutions. This paper presents a web-based Human Machine Interface (HMI) developed in the IoT software Grafana to visualize in real-time the operation of a Smart Microgrid. Photovoltaic generation is combined with hydrogen production and consumption in the microgrid. The main magnitudes of the components are measured and graphically displayed through a user-friendly web interface. Experimental results are reported to prove the suitability of the developed HMI

Domain walls in a non-linear S2-sigma model with homogeneous quartic polynomial potential

In this paper the domain wall solutions of a Ginzburg-Landau non-linear S2-sigma hybrid model are exactly calculated. There exist two types of basic domain walls and two families of composite domain walls. The domain wall solutions have been identified by using a Bogomolny arrangement in a system of sphero-conical coordinates on the sphere S2. The stability of all the domain walls is also investigated

Data aggregator implemented through industrial gateway IOT 2050 for smart microgrid

[EN] This paper describes the operation and implementation of a Data Aggregator based on an Industrial Gateway (DAIG) for the storage and transmission of information from an experimental Smart microgrid hybridised with green hydrogen. This DAIG consists of a Siemens IOT 2050, a commercial device that combines physical characteristics such as robustness and open-source software. To achieve this objective, each subsystem involved in the microgrid has a set of sensors and a Data Acquisition Device (DAD) to obtain the relevant logical magnitudes of its operation. The IOT 2050 serves as a centralised system, communicating via Modbus TCP/IP with each DAD and storing the data read in a local database by means of a Python script. Finally, as an example of the application of the designed infrastructure, an IoT software is implemented to visualise the data stored in the DAIG

Domain walls in a non-linear 2-sigma model with homogeneous quartic polynomial potential

[EN] In this paper the domain wall solutions of a Ginzburg-Landau non-linear 2-sigma hybrid model are exactly calculated. There exist two types of basic domain walls and two families of composite domain walls. The domain wall solutions have been identified by using a Bogomolny arrangement in a system of sphero-conical coordinates on the sphere 2. The stability of all the domain walls is also investigated

PV panel monitoring system for cell temperature analysis and comparison by embedded models

[EN] In recent decades, the use of renewable energy sources and the development of related technologies have been boosted due to the energy and environmental paradigm, with photovoltaic (PV) panels being one of the most implemented and optimised to date. The behaviour of panel operation is dependent on multiple parameters such as irradiance, wind speed or operating temperature. This paper presents a monitoring system based on IoT software focused on the study of the cell temperature (CT) of PV panels, highlighting the importance of this variable in the current generation and the equipment overall performance. For this purpose, a dashboard is implemented in Grafana to visualise the evolution of the CT and the associated variables. The implemented dashboard includes embedded models for the simulation of CT, in order to compare real and simulation data. This comparison determines the most suitable model to the real dynamics and could facilitate the development of intelligent control strategies for the pane