Los instrumentos antiguos de los gabinetes de Física : propuesta de clasificación y estudio comparativo

Se han estudiado colecciones de instrumentos de física que formaron parte de los antiguos gabinetes escolares españoles. A fin de realizar contrastes, se han considerado igualmente manuales de física de la época, laboratorios de investigación y laboratorios escolares actuales. Para ello se ha aplicado un esquema clasificatorio basado en criterios didácticos. Se obtiene así un perfil global para cada colección que pone de manifiesto la existencia de varios patrones característicos. Tales aportaciones contribuyen a un mejor conocimiento de la enseñanza de la física en el pasado, especialmente en la España del siglo XIX.This article describes a study of collections of physics instruments in Spanish schools. In order to compare the collections, an analysis was performed of physics textbooks of the 19th century as well as of instruments in research laboratories, and modern school laboratories. For this purpose a classification scheme, based on didactic criteria, was applied. In this way, we obtained a profile for each collection, which highlights the existence of a set of characteristic patterns. The results of our study contribute to a deeper knowledge of how physics was taught in the past, and especially in Spain in the 19th century

Groove gap waveguide in metallized 3D-printed plastic and in mechanized aluminium in Ka band

This paper conducts a comparison between two different manufacturing technologies for a prototype in Groove Gap Waveguide. Both technologies are metallized 3D-printed plastic and mechanized aluminium. The prototype is a straight section with transitions to WR-28 that works in the frequency band from 28 to 30 GHz. The main properties of the technologies in terms of losses, weight and ease of manufacture are presented, as well as measurements for both prototypes together with simulations

‘E-TAP’ CURRICULUM FOR VIRTUE EDUCATION: A FIT ANALYSIS TO THE ‘SKOLA-2030’ CURRICULUM

The virtue education curriculum ‘e-TAP’ is one of the recent efforts for improving character and virtue education at school in Latvia from preschool till grade nine. The objective of this research was to provide evidence regarding whether this curriculum is appropriate (‘fits’) to the Latvian context, in particular in reference to the Skola-2030 curriculum. Based on fit and feasibility theory, this work addressed the research question: “How does the treatment of virtues of the e-TAP curriculum fit to the treatment of virtues of the new Skola-2030 curriculum?”. The analysis used statistical descriptive frequency analysis of the virtues of each programme and comparative analysis between the two document sets included in each of them, using Excel software. The results show that Skola-2030 programme stresses performance and civic virtues, while the e-TAP programme underlines moral and intellectual virtues. Performance virtues are the most important ones in Skola-2030 (38 %), but account only for 17 % in the e-TAP curriculum. In addition, in Skola-2030 curriculum civic virtues account for 23 %, while in e-TAP they are only 8 %. In the e-TAP curriculum, moral virtues account for half of all the mentions (50 %) and intellectual virtues for 25 %, whereas in Skola-2030 those virtue groups account for 22 % and 18 %, respectively. The high ‘complementarity fit’ of both programmes suggests that the e-TAP curriculum could considerably enrich the Skola-2030 educational offer. Suggestions for e-TAP programme improvement and further research are put forward.

A ringed pole-on outflow from DO Tauri revealed by ALMA

We present new ALMA Band 6 observations including the CO (2-1) line and 1.3 mmcontinuum emission from the surroundings of the young stellar object DO Tauri. TheALMA CO molecular data show three different series of rings at different radial ve-locities. These rings have radii around 220 au and 800 au. We make individual fits tothe rings and note that their centers are aligned with DO Tauri and its optical high-velocity jet. In addition, we notice that the velocity of these structures increases withthe separation from the young star. We discuss the data under the hypothesis that therings represent velocity cuts through three outflowing shells that are possibly drivenby a wide-angle wind, dragging the environment material along a direction close to theline of sight (i= 19◦). We estimate the dynamical ages, the mass, the momentum andthe energy of each individual outflow shell and those of the whole outflow. The resultsare in agreement with those found in outflows from Class II sources. We make a roughestimate for the size of the jet/wind launching region, which needs to be of.15 au.We report the physical characteristics of DO Tauri?s disk continuum emission (almostface-on and with a projected major axis in the north-south direction) and its velocitygradient orientation (north-south), indicative of disk rotation for a 1-2 Mcentral star.Finally we show an HST [SII] image of the optical jet and report a measurement of itsorientation in the plane of the sky.Fil: Fernandez Lopez, Manuel. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomía; ArgentinaFil: Zapata Gonzalez, Luis Alberto. Universidad Nacional Autonoma de Mexico. Instituto de Astronomia; MéxicoFil: Rodríguez, Luis F.. Universidad Nacional Autonoma de Mexico. Instituto de Astronomia; MéxicoFil: Vazzano, María Mercedes. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomía; ArgentinaFil: Guzman, Andrés E.. National Astronomical Observatory Of Japan; JapónFil: López, Rosario. Universidad Autónoma de Barcelona. Facultad de Física. Departamento Astronomía y Meteorología; Españ

The Effect of the Spanish Nuclear Phase-out on the Electricity Market

Portugal and Spain are integrated into what is known as the Iberian Electricity Market. Spain participates in this market with significant contribution of energy produced by nuclear plants. In 2022, nuclear energy accounted for 22 % of the total energy generated in Spain. Nuclear power plants sell their energy largely through bilateral contracts, and approximately 20 % is offered in the day-ahead electricity market. By 2035, Spain will phase-out nuclear power producing a structural change of its generation mix. In this paper, we investigate the effect on the day-ahead Iberian electricity market that the gradual removal of nuclear power plants will have on the daily electricity market. The methodology is based on a ceteris paribus approach, where generation conditions are modified by removing nuclear plants and keeping the rest of the variables constant (demand and other generation). Under these conditions, the market is reproduced, estimating how electricity prices change in the day-ahead electricity market. To evaluate the market electricity prices under this new scenario with a total or a partial elimination of nuclear energy generation, it is necessary to use a market model. The existing literature shows various approaches to replicate the electricity market, among which are agent-base modelling, optimization algorithms, artificial intelligence techniques or metaheuristic merit-order methods. Our approach is based on the latter methods, by using actual generation and demand data, the new market generation and demand curves are reconstructed and the new clearing price is obtained. For the most conservative scenario, the results show a price increase of more than 5 % for the first 6 months of 2021. The reason for this increase is that nuclear generation participates in the market by offering its energy at prices close to zero. When this generation is withdrawn, there is a shift to the left of the hourly generation curve producing a new market equilibrium at a point of higher price and lower energy

PEDAGOGICAL LEADERSHIP ASPECTS OF LATVIAN VOCATIONAL EDUCATION INSTITUTIONS’ LEADERS

Leadership of vocational education institutions’ leaders is one of the leading resources in order to provide access, quality, competitiveness and sustainability of vocational education. The goal of the research is to analyse leadership of vocational education institutions’ leaders on the basis of the Charismatic, Emotional, Anticipatory, Professional, Participatory, Cultural, Formative and Administrative Dimensions (Gento González, 2012) identified due to the analysis of scientific literature and normative documents in the context of the vocational education reform. The outcomes of the quantitative research testify that students assess the vocational education institution leaders’ leadership more critically than staff, but from the respondents’ point of view the leadership characterizing criteria such as professionality, emotionality and charisma are assessed the highest in general.

New antenna topologies for 5G communication systems

This paper presents new antenna topologies for 5G communication systems. The objective is the study of low losses distribution network technologies and the radiating elements for low profile antennas for 5G applications. Different technologies are considered as PCB technology, LTCC technology and metallized 3D printing in terms of design procedures, transmission losses and manufacturing processes in order to contribute to these types of technologies. Different designs and prototypes are done to validate these antennas for 5G communication system

Comparison of 60 GHz Planar Array Antenna on LTCC and Rogers Substrates for 5G applications

The spectrum currently allocated for mobile service is fragmented into different frequency bands (800, 900, 1800, 2100,2600 MHz). However, those bands are getting congested and they are unable to satisfy the increasing user demand. The use of millimeter-wave bands appears as an opportunity to implement short range 5G data networks. The principal advantage of using millimeter-wave bands is the large amount of contiguous spectrum that can be used, which allows the delivery of high data rates. However, the technology is not yet so mature as in microwave frequencies. This paper presents array antennas using different materials: low-temperature cofired ceramics (LTCC) and Rogers substrates of a single radiating element, 1x2 and 2x2 array. The 2x2 array antenna achieves a -10 dB bandwidth from 58 to 65 GHz with a peak gain of 10.8 dBi at 60 GHz