Search results for "conduct"
showing 10 items of 4412 documents
Thermoelectrics: From history, a window to the future
2019
Thermoelectricity offers a sustainable path to recover and convert waste heat into readily available electric energy, and has been studied for more than two centuries. From the controversy between Galvani and Volta on the Animal Electricity, dating back to the end of the XVIII century and anticipating Seebeck’s observations, the understanding of the physical mechanisms evolved along with the development of the technology. In the XIX century Ørsted clarified some of the earliest observations of the thermoelectric phenomenon and proposed the first thermoelectric pile, while it was only after the studies on thermodynamics by Thomson, and Rayleigh’s suggestion to exploit the Seebeck effect for …
Hybrid materials based on conductive polymers for energy harvesting
2022
Uno de los objetivos de la Organización de las Naciones Unidas (ONU) para el Desarrollo Sostenible 2030 es obtener energía asequible y no contaminante. Por este motivo, se recomiendan encarecidamente las mejoras en la eficiencia energética y las fuentes de energía verde como soluciones óptimas para reducir las emisiones de dióxido de carbono y, por tanto, reducir la huella de carbono de nuestra sociedad. Las emisiones de carbono se han cuadriplicado desde 1950 y actualmente contribuyen en torno al 80 % de las emisiones de gases de efecto invernadero. Como resultado de este cambio, el clima global sufre cambios en las tendencias globales de lluvia y una reducción en los casquetes polares. Co…
The Large Hadron–Electron Collider at the HL-LHC
2021
The Large Hadron-Electron Collider (LHeC) is designed to move the field of deep inelastic scattering (DIS) to the energy and intensity frontier of particle physics. Exploiting energy-recovery technology, it collides a novel, intense electron beam with a proton or ion beam from the High-Luminosity Large Hadron Collider (HL-LHC). The accelerator and interaction region are designed for concurrent electron-proton and proton-proton operations. This report represents an update to the LHeC's conceptual design report (CDR), published in 2012. It comprises new results on the parton structure of the proton and heavier nuclei, QCD dynamics, and electroweak and top-quark physics. It is shown how the LH…
Window-Based Energy Selecting X-ray Imaging and Charge Sharing in Cadmium Zinc Telluride Linear Array Detectors for Contaminant Detection
2023
The spectroscopic and imaging performance of energy-resolved photon counting detectors, based on new sub-millimetre boron oxide encapsulated vertical Bridgman cadmium zinc telluride linear arrays, are presented in this work. The activities are in the framework of the AVATAR X project, planning the development of X-ray scanners for contaminant detection in food industry. The detectors, characterized by high spatial (250 µm) and energy (<3 keV) resolution, allow spectral X-ray imaging with interesting image quality improvements. The effects of charge sharing and energy-resolved techniques on contrast-to-noise ratio (CNR) enhancements are investigated. The benefits of a new energy-resolved …
Comparative environmental analysis of soil sampling methods in precision agriculture for lime application in Paraná State, Brazil
2020
Precision agriculture (PA) provides techniques that favour the localized application of inputs allowing their rational use. This makes the PA a potential indicator of reduced operational costs, input volume, and environmental impacts. The objective of this study was to evaluate and compare the environmental effects of three different sampling methods used in PA for the lime application. The first sampling method evaluated was the grid sampling (GS). It was performed at a density of one sample per hectare in a 100×100 m georeferenced grid. The second method was the directed sampling, that was performed after defining the management zones by soil apparent electrical conductivity (ECa) using a…
Ļaunprātīgas rīcības jēdziens Ženēvas 1956. gada 19. maija Konvencijā "Par kravu starptautisko autopārvadājumu līgumu (CMR)."
2015
CMR konvencijā pārvadātāju atbildība par pilnīgu vai daļēju kravas zaudējumu ir ierobežota. Tomēr 29. pantā ir ietverts izņēmums, kad pārvadātāja atbildība netiek ierobežota. 29. panta redakcija pieļauj ļoti atšķirīgu izpratni attiecībā uz to, kādos gadījumos pārvadātājs ir jāatbrīvo no atbildības. Darba mērķis ir padziļināti izpētīt ļaunprātīgas un tai pielīdzināmas rīcības jēdziena saturu, salīdzinot jēdziena izpratni Rietumeiropas valstīs un Latvijā. Darba ietvaros autors veiks konvencijas 29. panta teleoloģiskā un vēsturisko interpretāciju, kā arī aplūkos un analizēs valstu tiesu praksi 29. panta piemērošanā. Darba rezultāts ir izstrādāts pētījums, kurā ir uzskatāmi salīdzināta valstu i…
Revista iberoamericana de educación
2016
Resumen basado en el de la publicación Título, resumen y palabras clave en español, portugués e inglés Monográfico con el título: "Educación Infantil (I)" Se busca valorar los efectos y resultados del diseño y aplicación de un programa socioeducativo de convivencia, integrado por diversas estrategias de intervención, implantado en el 2º ciclo de Educación Infantil de un Centro de Acción Educativa Singular (CAES) de la ciudad de Valencia. Se utiliza un diseño cuasiexperimental pretest-postest con grupo control, recogiendo información de 93 miembros de la comunidad escolar de la etapa de Educación Infantil, de los cuales 50 son estudiantes, 7 docentes y 18 padres y madres. Los resultados demu…
Desarrollo de un paradigma de enriquecimiento ambiental y su potenciación mediante agonistas nicotínicos: efectos conductuales en ratones
2014
El paradigma del enriquecimiento ambiental (EE) en roedores se basa en proporcionar elevada estimulación cognitiva, física y social mediante diferentes procedimientos (generalmente un número elevado de animales que se mantienen en cajas grandes que contienen ruedas de actividad, túneles y diferentes tipos de juguetes). El principal objetivo de la presente Tesis Doctoral fue el desarrollo de un modelo de EE y la evaluación de sus efectos conductuales y fisiológicos en ratones con el fin de valorar si dicha manipulación contribuye a prevenir y/o revertir algunos de los efectos adversos que se observan asociados a factores como la edad o la exposición crónica situaciones de estrés social. Adem…
Structural analysis, phase stability and electrochemical characterization of Nb doped BaCe0.9Y0.1O3−x electrolyte for IT-SOFCs
2012
Abstract To improve the chemical stability of high temperature proton conductors based on barium cerate, electrolyte powders doped with different amounts of niobium were synthesized by the citrate–nitrate auto-combustion method. Pure single phases of BaCe 0.9− x Nb x Y 0.1 O 3− x (BCYN, 0.03 ≤ x ≤ 0.12) were obtained by thermal treatment at 1000 °C. Sintering at 1450 °C for 10 h produced dense pellets. X-ray absorption spectroscopy allowed to define the dopant ion insertion site and the co-dopant valency. Treatments in pure CO 2 atmosphere at 700 °C for 3 h and subsequent XRD analysis were carried out to probe the chemical stability of the produced electrolytes. The influence of the prese…
The Contribution of Electrical Resistivity Measurements to the Analysis of Landslide Events
2005
In order to gain insight into the study of natural avalanches dynamics, we illustrate a statistical model based on a dissipative dynamical variable associated to a position dependent factor of safety field. This model, as experimentally demonstrated, is able to reproduce the complex structure of landslide events, such as power-law distributions. In this paper, we introduce an explicit dependence of the safety factor on the electrical resistivity to simulate landslide events in pyroclastic soils. An application of the model to data acquired in a test area characterized by flowslide events (Monte Albino, Campania Region - South Italy) bear witness the relevant role played by the resistivity m…