Third derivative modification of k-step block Falkner methods for the numerical solution of second order initial-value problems

[EN]This paper is devoted to the development and analysis of a modified family of Falkner- type methods for solving differential systems of second-order initial-value problems. The approaches of collocation and interpolation are adopted to derive the new methods. These modified methods are implemented in block form to obtain the numerical solutions to the considered problems. The study of the properties of the proposed block Falkner-type methods reveals that they are consistent and zero-stable, and thus, convergent. From the stability analysis, it could be seen that the proposed Falkner methods have non-empty sta- bility regions for k = 2 , 3 , 4 . Some numerical test are presented to illustrate the efficiency of the proposed family

El metamorfismo del sector El Vellon-Pedrezuela (Sistema Central Español)

El presente trabajo aborda el estudio metamorfico del sector «El Vellon - Pedrezuela». Mediante la determinación de los diferentes tipos de paragenesis minerales que contienen los materiales que afloran en este sector (metapelitas. metasamitas. anfibolitas y rocas calcosiiicatadas). de sus relaciones interminerales y de sus penodos de blastesis. se establece un metamorfismo regional progresivo de grado medio. Dicho metamorfismo se caracteriza por unas condiciones de 5.25 Kbar y 550 UC para un periodo de interfase yariando estas durante la segunda fase a 4 4 0.5 Kbar y 600 JC. Ei gradiente metamorfico aumenta di: 26 oC/Km. a 380 4 5 oC/Km desde el periodo de interfase a la segunda fase hercinica

The boson peak in structural and orientational glasses of simple alcohols: Specific heat at low temperatures

We review in this work specific-heat experiments, that we have conducted on different hydrogen-bonded glasses during last years. Specifically, we have measured the low-temperature specific heat Cp for a set of glassy alcohols: normal and fully-deuterated ethanol, 1- and 2- propanol, and glycerol. Ethanol exhibits a very interesting polymorphism presenting three different solid phases at low temperature: a fully-ordered (monoclinic) crystal, an orientationally-disordered (cubic) crystal or 'orientational glass', and the ordinary structural glass. By measuring and comparing the low-temperature specific heat of the three phases, in the 'boson peak' range 2-10 K as well as in the tunneling-states range below 1K, we are able to provide a quantitative confirmation that ''glassy behavior'' is not an exclusive property of amorphous solids. On the other hand, propanol is the simplest monoalcohol with two different stereoisomers (1- and 2-propanol), what allows us to study directly the influence of the spatial rearrangement of atoms on the universal properties of glasses. We have measured the specific heat of both isomers, finding a noteworthy quantitative difference between them. Finally, low-temperature specific-heat data of glassy glycerol have also been obtained. Here we propose a simple method based upon the soft-potential model to analyze low-temperature specific-heat measurements, and we use this method for a quantitative comparison of all these data of glassy alcohols and as a stringent test of several universal correlations and scaling laws suggested in the literature. In particular, we find that the interstitialcy model for the boson peak [A. V. Granato, Phys. Rev. Lett. 68 (1992) 974] gives a very good account of the temperature at which the maximum in Cp/T^3 occurs.Comment: 16 pages, 2 figures, Proceedings of the 4th International Discussion Meeting on Relaxations in Complex Systems, Hersonissos (Crete), June 2001. Journal of Non-Crystalline Solids (accepted for publication

Morfología polínica y su implicación en la taxonomía de las especies endémicas del complejo Gonospermum Less., Lugoa D.C. y Tanacetum L. (Asteraceae: Anthemideae) en las Islas Canarias, España

XV lnternational A.P.L.E. Symposium of Palynolog

A saltar las instituciones

"¡Contra, contra, contra! Anti, anti, anti! No, no, no!" Mani muy radical a la que asistieron 27 personas y un perrete. Barcelona, Gràcia. Septiembre de 1996.[...] 'Contra, contra, contra! Anti, anti, anti! No, no, no! ' Mani molt radical a la qual van assistir 27 persones i un perrete. Barcelona, Gràcia. Setembre de 1996. [...

Morfología polínica del género Allagopappus Cass. (Asteraceae: Inuleae), endémico de las Islas Canarias, España

XV lnternational A.P.L.E. Symposium of Palynolog

Problemas y propuestas de mejora en la atención sanitaria a los inmigrantes económicos

ResumenObjetivosAnalizar los problemas que existen en la atención sanitaria a los inmigrantes económicos en opinión de profesionales sociosanitarios, de la administración sanitaria y de inmigrantes, así como conocer y priorizar las propuestas de los profesionales para mejorar dicha atención.MétodosEstudio descriptivo de enfoque cualitativo realizado en Mallorca. Se han realizado tres grupos focales y tres grupos nominales con profesionales de atención primaria y especializada, dos entrevistas semiestructuradas a dos miembros de la administración sanitaria, uno de la Administración autonómica y otro de la Administración central, y doce entrevistas semiestructuradas a inmigrantes económicos identificados a partir de informantes clave.ResultadosEl incremento del número de inmigrantes económicos es percibido por los profesionales y por la administración con una sensación de llegada masiva. Los principales problemas identificados han sido las restricciones de acceso, el seguimiento de estos pacientes, y la falta de entrenamiento en medicina tropical. Los inmigrantes, en cambio, están más preocupados por regularizar su situación y por el acceso a la vivienda. La primera propuesta de los profesionales es su formación en medicina tropical. La Administración autonómica prioriza el acceso a los servicios sanitarios y la búsqueda activa de problemas de salud en esta población, mientras que la Administración central aboga en primer lugar por la regularización de todos los inmigrantes.ConclusionesLas principales barreras en la atención sanitaria a los inmmigrantes económicos son, en opinión de los profesionales sociosanitarios, las restricciones de acceso, el seguimiento clínico y la falta de entrenamiento en medicina tropical, y para mejorar esta situación los profesionales demandan formación. Las prioridades de las Administraciones autonómica y central no son coincidentes. Finalmente, para los inmigrantes económicos, la atención sanitaria no parece ser una prioridad.SummaryObjectivesTo analyse existing problems in health care to economic immigrants from the point of view of health and social professionals, health authorities and economic immigrants and to know which will be their proposals and priorities to improve economic immigrants’s health assistance.MethodsQualitative approach study made in Majorca island. (Spain). Three focus groups and three nominal groups with health and social workers from primary health care and hospital services were carried out as well as two partially structured interviews to health authorities, one Autonomic Authority and one Governmental Authority, and twelve partially structured interviews to economic immigrants identified trough key informants.ResultsHealth and social workers perceive the increase in the number of economic immigrants as a massive arrival. The main problems identified are: access restrictions to public helath services for economic immigrants, the follow-up of these patients and diagnostic difficulties because lack of training in tropical medicine. Health and social workers’s first proposal for improving this situation is their own training in tropical medicine. Autonomic Authority priorities are to garantiee access to public health services for all immigrants and to look actively for health problems in these population. Governmental Authority, instead, holds the legalization for all. In fact, economic immigrants are not concerned on health care because legalization and houssing problems.ConclusionsThe main barriers identified by health and social workers in health care to economic immigrants are: access restrictions, follow-up and lack of training in tropical medicine. Health and social first proposal to improve this situation is their own training in tropical medicine while Autonomic and Central Authorities’s priorities are not the same. For economic inmigrants, health assistance is not their biggest concern

Developing biodata for public manager selection purposes: A comparison between fuzzy logic and traditional methods

Biodata have been widely used in personnel selection for a long time, mainly due to their predictive validity in different contexts, low faking, and positive applicant reactions. At the same time, some disadvantages need to be highlighted, with discriminatory content representing a major concern. In order to shed light on these issues, the objectives of the present research are twofold: firstly, we aim to develop biodata items for personnel selection for the provision of managerial positions in Public Administration and, secondly, we aim to test the fuzzy logic method as a valid approach for the development of biodata scales, with a view to choosing the best biodata items in terms of job performance, fairness, and privacy, according with manager and applicant perspectives. Participants assessed 26 items according to traditional and fuzzy rules, resulting in 8 highly effective items. Then, both approaches were compared: fuzzy logic turned out to have similar results as the traditional approach. Finnally, future developments in research an practical implications in the field are suggested. Los datos biográficos (biodata) se han utilizado en la selección de personal durante mucho tiempo debido, principalmente, a su buena validez predictiva en diferentes contextos, a su bajo falseamiento y a las reacciones positivas de los solicitantes de empleo. No obstante, podemos destacar el posible contenido discriminatorio como su principal desventaja. Por tanto, los objetivos de la presente investigación son, en primer lugar, desarrollar empíricamente ítems válidos y justos para la selección de puestos directivos en la Administración Pública y, en segundo lugar, comprobar la utilidad de la lógica difusa en el desarrollo de escalas con biodata para elegir los mejores ítems en términos de desempeño laboral, equidad y privacidad, de acuerdo con las perspectivas de directivos y de solicitantes de empleo. Los participantes en el estudio evaluaron 26 ítems según reglas tradicionales y difusas, y se obtuvieron 8 ítems altamente efectivos. Posteriormente se compararon ambos enfoques: aunque la lógica difusa demostró cierta eficacia, logró resultados similares a los del enfoque tradicional. Finalmente, se proponen futuros desarrollos de investigación e implicaciones prácticas en esta materia

Do Gender And Age Influence Agroforestry Farmers’ Knowledge Of Tree Species Uses In An Area Of The Atlantic Forest, Brazil?

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)This study aimed to explore the extent of knowledge of tree species and their uses by agroforestry farmers in the Vale do Ribeira, Brazil, to verify whether gender and age are related to species knowledge in different use categories. The study was conducted using semi-structured interviews, guided tours, direct observation and collection and identification of botanical material. Analyses were based on the frequency with which plants were mentioned. Forty farmers (17 women and 23 men aged 18 to 78 years) were interviewed. There were significant differences in the species richness cited exclusively by each gender; the number of species mentioned by men (36 sp.) was higher than by women (11 sp.). Men exhibited a greater knowledge of such categories as construction, organic matter, fuel, animal feed, technology and beekeeping, whereas there were no significant differences for food, medical and other categories. Age was also a distinguishing factor; younger people mentioned the lowest number of species (74 sp.) compared to adults (163 sp.) and the elderly (150 sp.). The greater number of species mentioned exclusively by men may indicate the existence of specialized knowledge, whereas environmental constraints and the availability of plant resources may limit the knowledge of young people. © 2016, Sociedade Botanica do Brasil. All rights reserved.304667682CAPES, Coordenação de Aperfeiçoamento de Pessoal de Nível SuperiorCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES

Resposta de milhos híbridos e variedades de polinização livre a fertilização orgânica e mineral

Em condições de cultivo marginais, as variedades regionais de polinização livre de milho podem ser alternativa aos híbridos comerciais. Neste trabalho reportam-se resultados comparativos de duas variedades regionais de milho, uma proveniente de Benguela ('Angola'), e outra proveniente do norte de Portugal ('Montalegre'), e dois híbridos comerciais, um recomendado para Benguela ('SC411SRT') e outro recomendado para o norte de Portugal ('PR36Y03'). A experiência foi organizada num fatorial com as quatro cultivares referidas e seis modalidades de fertilizaçao, 0, 50, 100 e 200 kg N ha' na forma de nitrato de amónio, estrume de bovino e um composto orgânico comercial aplicados na dose de 100 kg N ha'. Os ensaios decorreram em Bragança, NE Portugal. A variedade 'Angola' foi a que apresentou maior altura média (3, 6 m), maior número de folhas (18) e menor número de espigas por planta (0, 9). Na posição oposta esteve a variedade 'Montalegre' com a menor altura (2, 2 m), menor número de folhas (9) e maior número de espigas por planta (1, 1). A produção de gao foi mais elevada no híbrido 'SC411SRT' (9,8 Mg hal ), seguida do híbrido 'PR36Y03' (8,1 Mg ha '), variedade 'Montalegre' (5, 7 Mg ha') e, por último, a variedade 'Angola' (0,8 Mg ha'). As modalidades de fertilizaçao orgânica, em particular o estrume de bovino, mostraram baixa eficiência de uso do azoto e menor produtividade que as modalidades de fertilizaçâo mineral. A variedade 'Montalegre', de ciclo particularmente curto, produziu aproximadamente ao nível das cultivares híbridas se os resultados tiverem em conta o tempo necessário até à colheita e a soma de temperaturas associadas ao seu ciclo cultural.info:eu-repo/semantics/publishedVersio