Diversidad florística del patio del museo provincial “Ignacio Agramonte Loynaz”, Camagüey, Cuba

The results of the floristic-physiognomic study of a space of 2,620 m2, located in a building from the colonial era that holds, since 2016, the status of National Monument is shown. The current flora was studied in situ and sources referring to previous stages were reviewed. The samples were identified by comparison with scientific collections and the use of descriptions and keys. The origin, distribution, presence in Cuba, conservation status and behavior before the anthropic impact of each taxon, were taken from the specialized literature. The similarity with three relevant areas of gardening in the city was calculated. 152 species are registered, most of them exotic and that in the country are only found in cultivation for their recognized ornamental utility, or that, even naturalized, remain associated with human activity. Despite the recent reduction in the number of plants, including trees, elements of the lawn and relevant individuals due to their visual impact, it continues to be a welcoming, aesthetically relevant natural space, with significant cultural potential and notable environmental impact, by it is located in an area densely urbanized. Ensuring substrates, irrigation, recycling of organic matter, as well as the promotion of germinators and own nurseries to stimulate the replacement of specimens, are identified as basic conditions to recover the splendor that the flora and vegetation had in past times. As a live room of the museum, it is recommended to present it as a representative sample of the city's gardening and as an incarnation of the patio that characterizes Camagüey's colonial architecture.Se muestran los resultados del estudio florístico-fisionómico de un espacio de 2 620 m2, ubicado en un inmueble de la época colonial que ostenta, desde 2016, la condición de Monumento Nacional. Se estudió in situ la flora actual y se revisaron fuentes referidas a etapas anteriores. Las muestras se identificaron por comparación con colecciones científicas y el uso de descripciones y claves. El origen, distribución, presencia en Cuba, estado de conservación y comportamiento ante el impacto antrópico de cada taxón, se tomó de la literatura especializada. Se calculó la similitud con tres áreas relevantes de la jardinería de la ciudad. Se registran 152 especies, en su mayoría exóticas y que en el país solo se encuentran en cultivo por su reconocida utilidad ornamental, o que, aún naturalizadas, se mantienen asociadas a la actividad humana. A pesar de la reciente reducción del número de plantas, incluidos árboles, elementos del césped e individuos relevantes por su impacto visual, sigue siendo en un espacio natural acogedor, estéticamente relevante, con significativo potencial cultural y notable repercusión ambiental por encontrarse ubicado en una zona densamente urbanizada. Asegurar sustratos, riego, reciclaje de materia orgánica, así como el fomento de germinadores y viveros propio para dinamizar el remplazo de especímenes, se identifican como condiciones básicas para recuperar el esplendor que tuvo la flora y vegetación en épocas pasadas. Como sala viva del museo, se recomienda presentarla como muestra representativa de la jardinería de la ciudad y como encarnación del patio que caracteriza la arquitectura colonial camagüeyana

Simulation of multipactor effect trough the individual simulation of electrons

This is an electronic version of the paper presented at the 5th International Workshop on Multipactor, Corona and Passive Intermodulation In Space RF Hardware, held in Noordwijk on 2005In the context of the ESA Program AO 4025 Surface Treatment and Coating, we have developed a simulator called MEST for the prediction of the multipactor effect. The simulator has been developed using a micro level object-oriented approach, where each electron in the simulation is an independent object. This approach differs from other models described in the literature, which are macro level or intermediate, handling electrons in packages rather than individually. MEST works with a simplified model of a waveguide, where a radiofrequency potential is applied to the plates. The space between the plates is assumed to be a vacuum, except for the presence of a number of free electrons. The individual trajectories of all the electrons in the RF field are computed, although no space charge effects are assumed. When electrons collide with the plates, secondary emission of electrons is simulated. The secondary electron emission yield (SEY) is computed with a detailed Monte Carlo model, which has been validated using experimental data. It depends on the surface material (bulk), but also on surface finish properties, such as air contamination, cleanliness or surface treatments. If certain conditions hold, the number of electrons between the plates may increase out of control, until a multipactor discharge occurs and the waveguide becomes unusable. The object of the simulator is to predict the occurrence (or not) of this phenomenon for different surface materials. The simulator has been validated using experimental data from ESTEC (ESA), UAM and TESAT. Several materials have been tested. The results show good agreement with the experimental dat

A novel algorithm for dynamic student profile adaptation based on learning styles

The file attached to this record is the author's final peer reviewed version. The Publisher's final version can be found by following the DOI link.E-learning recommendation systems are used to enhance student performance and knowledge by providing tailor- made services based on the students’ preferences and learning styles, which are typically stored in student profiles. For such systems to remain effective, the profiles need to be able to adapt and reflect the students’ changing behaviour. In this paper, we introduce new algorithms that are designed to track student learning behaviour patterns, capture their learning styles, and maintain dynamic student profiles within a recommendation system (RS). This paper also proposes a new method to extract features that characterise student behaviour to identify students’ learning styles with respect to the Felder-Silverman learning style model (FSLSM). In order to test the efficiency of the proposed algorithm, we present a series of experiments that use a dataset of real students to demonstrate how our proposed algorithm can effectively model a dynamic student profile and adapt to different student learning behaviour. The results revealed that the students could effectively increase their learning efficiency and quality for the courses when the learning styles are identified, and proper recommendations are made by using our method

AO-4025 ITT ESA - Surface treatments and coatings for reduction of multipactor and Passive InterModulation (PIM) effect in RF components

This is the electronic version of a paper presented at the 4th International Workshop on Multipactor, Corona and Passive Intermodulation in Space RF Hardware (MULCOPIM 2003) held in Noordwijk, The Netherlands.ESA has initiated several activities with the aim to reduce the risk of multipaction and corona effects in space hardware. Within the activity Surface Treatment and Coating for the Reduction of Multipactor and Passive Intermodulation (PIM) Effects in RF Components a European group has been formed to investigate new surface coatings / treatments to improve the power handling capability of passive equipment with respect to multipactor and passive intermodulation. This paper presents an overview of the activities to be performed within this project and describes the first results

ULEARN: Personalised Learner’s Profile Based On Dynamic Learning Style Questionnaire

The file attached to this record is the author's final peer reviewed version.E-Learning recommender system effectiveness re- lies upon their ability to recommend appropriate learning con- tents according to the learner learning style and preferences. An effective approach to handle the learner preferences is to build an efficient learner profile in order to gain adaptation and individualisation of the learning environment. It is usually necessary to know learning style and preferences of the learner on a domain before adapting the learning process and course content. This study focuses on identifying the learning styles of students in order to adapt the learning process and course content. ULEARN is an adaptive recommender learning system designed to provide learners with personalised learning environment such as course learning objects that match their adaptive profile. This paper presents the algorithm used in ULEARN to reduce dynamically the number of questions in Felder-Silverman learning style ques- tionnaire used to initialise the adaptive learner profile. Firstly, the questionnaire is restructured into four groups, one for each learning style dimension; and a study is carried out to determine the order in which questions will be asked in each dimension. Then an algorithm is built upon this ranking of questions to calculate dynamically the initial learning style of the user as they go through the questionnaire

Automatic composition of music by means of Grammatical Evolution

This is the author's version of the work. It is posted here for your personal use. Not for redistribution. The definitive Version of Record was published in APL Quote Quad, http://dx.doi.org/10.1145/604444.602249Proceedings of the 2002 conference on APL: array processing languages: lore, problems, and applications (Madrid)This work describes how grammatical evolution may be applied to the domain of automatic composition. Our goal is to test this technique as an alternate tool for automatic composition. The AP440 auxiliary processor will be used to play music, thus we shall use a grammar that generates AP440 melodies. Grammar evolution will use fitness functions defined from several well-known single melodies to automatically generate AP440 compositions that are expected to sound like those composed by human musicians.This paper has been sponsored by the Spanish Interdepartmental Commission of Science and Technology (CICYT), project numbers TEL1999-0181 and TIC2001-0685-C02-1