Search results for "General Engineering"
showing 10 items of 2407 documents
Límites y posibilidades de las políticas institucionales inclusivas en las universidades del conurbano bonaerense. Explorando caminos nuevos
2019
Este trabajo se inscribe en una línea de investigación que explora las políticas institucionales que llevan a cabo las universidades argentinaspara favorecer el acceso, la permanencia y el rendimiento académico del estudiantado. Particularmente, se concentra en las universidadespúblicas del conurbano bonaerense (Provincia de Buenos Aires), que atienden a una población estudiantil proveniente de sectores de bajosingresos. El objetivo del presente trabajo es identificar, describir y analizar algunas políticas institucionales en dos ámbitos: uno, centradoen aquellas políticas que están orientadas a contribuir al sostenimiento económico de las y los ingresantes ?a través de becas, y de libros y…
Speeches About Men and Women in Technical Education: Between Reproduction and Transformation. A Study Located in Two Argentinian Provinces
2020
La formación técnica en Argentina ha sido un ámbito históricamente masculinizado. Ante el incremento de la matrícula femenina y la visibilización y demandas sociales respecto de las desigualdades de género, nos preguntamos, de qué manera las instituciones de ETP favorecen el reconocimiento y la participación con miras a la justicia social. Este trabajo analiza discursos sobre las desigualdades entre varones y mujeres (en interseccionalidad con otras) que circulan en 12 instituciones de educación técnico profesional en dos provincias argentinas (Neuquén y Mendoza), y sobre los dispositivos de acompañamiento a la escolaridad y articulación con el trabajo que allí se construyen. Desplegamos un…
A comprehensive probabilistic analysis of approximate SIR‐type epidemiological models via full randomized discrete‐time Markov chain formulation with…
2020
Spanish Ministerio de Economia y Competitividad, Grant/Award Number: MTM2017-89664-P; Generalitat Valenciana, Grant/Award Number: APOSTD/2019/128; Ministerio de Economia y Competitividad, Grant/Award Number: MTM2017-89664-P
Some approximation properties of a Durrmeyer variant ofq-Bernstein-Schurer operators
2016
Polarization and acoustic properties of barium-modified lead-free potassium–sodium niobate ceramics
2017
The publication costs of this article were covered by the Estonian Academy of Sciences and the University of Tartu.
Determination of Contact Potential Difference by the Kelvin Probe (Part II) 2. Measurement System by Involving the Composite Bucking Voltage
2016
Abstract The present research is devoted to creation of a new low-cost miniaturised measurement system for determination of potential difference in real time and with high measurement resolution. Furthermore, using the electrode of the reference probe, Kelvin method leads to both an indirect measurement of electronic work function or contact potential of the sample and measurement of a surface potential for insulator type samples. The bucking voltage in this system is composite and comprises a periodically variable component. The necessary steps for development of signal processing and tracking are described in detail.
Determination of Contact Potential Difference by the Kelvin Probe (Part I) I. Basic Principles of Measurements
2016
Abstract Determination of electric potential difference using the Kelvin probe, i.e. vibrating capacitor technique, is one of the most sensitive measuring procedures in surface physics. Periodic modulation of distance between electrodes leads to changes in capacitance, thereby causing current to flow through the external circuit. The procedure of contactless, non-destructive determination of contact potential difference between an electrically conductive vibrating reference electrode and an electrically conductive sample is based on precise control measurement of Kelvin current flowing through a capacitor. The present research is devoted to creation of a new low-cost miniaturised measuremen…
Structural, optical, and luminescence properties of ZnO:Ga optical scintillation ceramic
2018
This paper discusses the characteristics of ZnO and ZnO:Ga ceramics fabricated by uniaxial hot pressing. The short-wavelength transmission limit of zinc oxide ceramics is in the 370-nm region; the long-wavelength limit is determined by the free-charge-carrier concentration and lies in the interval from 5 to 9 μm. The total transmittance of such ceramics in the visible and near-IR regions is about 70% when the sample is 0.5 mm thick. The luminescence spectrum is represented by a broad emission band with maximum at 580 nm, having a defect nature. The introduction of 0.03–0.1 mass % gallium into the zinc oxide structure inhibits grain growth and increases the free-charge-carrier concentration …
Isothermal relaxation of discommensurations in K2ZnCl4
1994
At the incommensurate-ferroelectric transition temperature T c of K 2 ZnCl 4 , the dielectric susceptibility contains an anomalous contribution both above and below T c . Previous quasi-static dielectric measurements and hysteresis loops demonstrated that this anomalous part arises from the peculiar dynamics of discommensurations. We have used isothermal dielectric measurements to get some insight into the long time dynamics of these discommensurations. We have found that the characteristic relaxation times τ are of the order of 10 4 s in the incommensurate and in the ferroelectric phase. Even more unusual is a non-monotonous relaxation which is observed in a restricted temperature range ab…
Comparative Study on Micromechanical Properties of ZnO:Ga and ZnO:In Luminiscent Ceramics
2021
The research has been supported by the Project ERANET RUS_ST#2017-051(Latvia) and #18-52-76002 (Russia). The Institute of Solid State Physics, University of Latvia as the Centre of Excellence has received funding from the European Union’s Horizon 2020 Framework, Program H2020-WIDESPREAD-01-2016-2017-Teaming Phase 2 under grant agreement No. 739508, project CAMART2.