Multiferroic Quantum Criticality

The zero-temperature limit of a continuous phase transition is marked by a quantum critical point, which can generate exotic physics that extends to elevated temperatures. Magnetic quantum criticality is now well known, and has been explored in systems ranging from heavy fermion metals to quantum Ising materials. Ferroelectric quantum critical behaviour has also been recently established, motivating a flurry of research investigating its consequences. Here, we introduce the concept of multiferroic quantum criticality, in which both magnetic and ferroelectric quantum criticality occur in the same system. We develop the phenomenology of multiferroic quantum critical behaviour, describe the associated experimental signatures, and propose material systems and schemes to realize it.Comment: 8 pages, 4 figure

Fair Coexistence of Scheduled and Random Access Wireless Networks: Unlicensed LTE/WiFi

We study the fair coexistence of scheduled and random access transmitters sharing the same frequency channel. Interest in coexistence is topical due to the need for emerging unlicensed LTE technologies to coexist fairly with WiFi. However, this interest is not confined to LTE/WiFi as coexistence is likely to become increasingly commonplace in IoT networks and beyond 5G. In this article we show that mixing scheduled and random access incurs and inherent throughput/delay cost, the cost of heterogeneity. We derive the joint proportional fair rate allocation, which casts useful light on current LTE/WiFi discussions. We present experimental results on inter-technology detection and consider the impact of imperfect carrier sensing.Comment: 14 pages, 8 figures, journa

Impact of a change in the scoring system on the competitive balance: The Six Nations Championship

In sports economics, measuring the competitive balance of a league is done through normalised indices. These indices require that the maximum level of concentration is known. Which situation represents the maximum concentration? How is the competitive balance affected if the scoring system changes? We see it in rugby, particularly in the Six Nations Championship.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech

Aerodynamic Analysis of Cup Anemometers Performance: The Stationary Harmonic Response

The effect of cup anemometer shape parameters, such as the cups’ shape, their size, and their center rotation radius, was experimentally analyzed.This analysis was based on both the calibration constants of the transfer function and the most important harmonic termof the rotor’smovement,which due to the cup anemometer design is the third one.This harmonic analysis represents a new approach to study cup anemometer performances. The results clearly showed a good correlation between the average rotational speed of the anemometer’s rotor and the mentioned third harmonic term of its movement

Accurate Simulation of MPPT Methods Performance When Applied to Commercial Photovoltaic Panels

Anew, simple, and quick-calculationmethodology to obtain a solar panel model, based on the manufacturers’ datasheet, to perform MPPT simulations, is described. The method takes into account variations on the ambient conditions (sun irradiation and solar cells temperature) and allows fast MPPT methods comparison or their performance prediction when applied to a particular solar panel. The feasibility of the described methodology is checked with four different MPPT methods applied to a commercial solar panel, within a day, and under realistic ambient conditions

Alkyl End Group Effects on the Thermal Decomposition of Oxymethylene Ether Fuel Additives

Efforts to improve the efficiency of internal combustion engines continue, and with them so do the investigations of fuel additives with favorable properties that reduce harmful emissions. One potential additive is dimethoxymethane (DMM), the simplest oxymethylene ether (OME), its high oxygen to carbon ratio is ideal for reducing engine soot formation. However, major disadvantages like low cetane number, low lower heating value (LHV), and high water solubility may impede DMM from being widely adopted. Although OMEs with more oxymethylene units and higher cetane numbers have been explored as alternatives, drawbacks regarding their low energy density, oxidative stability, and poor sealing material compatibility remain.Recent studies have shown that OMEs with longer alkyl end groups like diethoxymethane (DEM) and dipropoxymethane (DPM) have better diesel compatibility, higher energy densities, and remain environmentally friendly. This work seeks to elucidate the initiation chemistry of DEM and DPM by quantifying the primary reactions that occur during the onset of the combustion. To do this, a chemical kinetic investigation was carried out to study the pyrolysis of DEM, DPM, and the most relevant radicals formed from their thermal decomposition. High-level electronic structure calculations at the (CCSD(T)/cc-pV&infin;Z//M06-2X/cc-pVTZ) level of theory were leveraged in conjunction with master equation theory to quantify the rates of reaction. The predicted temperature and pressure-dependent rate constants showed that single-step soot precursor-forming reactions in DEM and DPM have low importance at ignition temperatures, instead these soot precursors likely form through radical decomposition reactions. In addition, it was found that H-atom abstraction radicals from DEM favor the production of ethyl formate and acetaldehyde. Although similar compounds were produced by equivalent radicals for DPM, the results suggest that these radicals are also prone to generate abundant amounts of formaldehyde at high temperatures. This is the first comparison of the pyrolysis of different OME end groups and is the first high-level ab initio study of DPM. Lastly, python codes were developed and integrated with existing software to automate the computational process. The improved computational pipeline was leveraged to expedite the application of quantum mechanical methods to compute rates for DEM and DPM. &nbsp;</p

Evaluación de un tratamiento de floculación-flotación para el agua residual generada en el procedimiento de subproductos avícolas

Se evaluó el tratamiento de vapor condensado de cocción de plumas, agua de vísceras, suero de sangre, lixiviado de lodos de mataderos y agua de lavado de una plata de procesamiento de subproductos avícolas mediante la técnica de floculación-flotación. Se hicieron ensayos variando los porcentajes de las corrientes para la preparación de los tres tipos de agua de interés en el tratamiento y las dosificaciones de agentes químicos para las aguas preparadas. Mediante una serie de pruebas de jarras se logró determinar las mejores condiciones para la remoción de carga contaminante presente en las diferentes muestras de agua residual. Con dichas condiciones se realizaron estudios analíticos para determinar la variación de los parámetros de calidad de agua como pH, turbiedad, sólidos suspendidos totales, demanda bioquímica de oxígeno y demanda química de oxígeno.Treating condensed steam cooking feather water viscera, blood serum, slaughterhouses leachate slurry and wash water a poultry processing silver products by flocculation-flotation technique was evaluated. Tests were performed by varying the percentages of the currents for the preparation of water three types of interest in the treatment and dosages of chemical agents prepared waters. Through a series of jar tests it was determined the best conditions for the removal of pollution load present in the different samples of wastewater. With these conditions analytical studies were conducted to determine the variation of water quality parameters such as pH, turbidity, total suspended solids, biochemical oxygen demand and chemical oxygen demand.processing byproduct

Propiedades psicométricas de la escala de satisfacción en la pareja (ESP-10) en adultos de Lima Metropolitana, 2021

La satisfacción en la pareja es un constructo unidimensional que ha tenido recientemente solo una escala que logra medirla, pero desarrollada y validada en pobladores de Puerto Rico. Sin embargo, al tratarse de una escala que mide la relación de pareja sin intentar tipificarla como una unión civil en matrimonio, o en sentido religioso, o deseando considerar solo a las parejas convivientes, la ESP-10 resulta apropiada para aplicarla y analizarla en nuestra población. Para ello, se analizó el criterio de jueces para después realizar una prueba piloto en pobladores de Lima Metropolitana en el 2021. Se analizó la validez de contenido por criterio de jueces; los ítems a través del análisis descriptivo; la valides por estructura interna, la fiabilidad a través del estadístico Alpha de Cronbach, y por último, se desarrolló los baremos y percentiles con la muestra final. Así mismo fue importante hallar la relación que tenía con otras variables negativas para entender su forma de relacionarse, en este caso, con el Cuestionario de Dependencia Emocional (CDE) y la Escala de Celos, ambos adaptadas a la población peruana por Ventura-León, J., y Caycho-Rodríguez, (2016) en el (CDE) y con Caycho-Rodríguez, T., Barboza Palomino, M., Aparco, V., & Rodas, N. (2018) en la Escala de Celos Versión Peruana, que fueron integradas en la discusión y conclusiones finalmente