on lagrangian-grassmannian variety

In this paper it is shown that Family of Linear Relations of Contraction ($FRLC$) are the only ones, up to linear combination, that vanish the Lagrangian-Grassmannian. It is shown that the Pl\"ucker matrix of the Lagrangian-Grassmannian is a direct sum of incidence matrix, regular and sparce with entries in the set { 0, 1}.Comment: 24 page

Bullying y Mobbing en la Escuela

School bullying, whether it manifests as bullying or mobbing, constitutes a violent and intentional behavior, aimed at causing damage, of a verbal and physical nature to another person who is perceived as a victim, on which a submission is exercised that perpetuates its evolution violent and its incidence. The problem occurs in various countries and cultures and in Colombia 8,981 cases have already been registered this year throughout the country.In the district of Barranquilla, the phenomenon has a prevalence of 1,330, which led to the research approach, which aimed to study the effects of a social acceptance program based on resilience in a group of students. The methodology was proposed with a quantitative approach and with a longitudinal quasi-experimental design, with observation before (pre-test) and observation after (post-test) the intervention of the program. An intentional sampling was carried out with the participation of 26 students, 13 made up the control group and 13 the experimental group, from grade 8 of elementary school with coexistence problems registered by the school administration. The ICD-Abbreviated scale was applied to them. The results revealed that the intervention carried out significantly reduced aggressive behavior among peers and rejection behaviors that maintained bullying and mobbing. Social inclusion, positive participation within the group and coexistence were intensified. Statistical analysis was carried out with the application of the Student's T testEl Acoso escolar ya sea que se manifieste como bullying o mobbing, constituye una conducta violenta e intencional, dirigida a ocasionar daños, de tipo verbal y físico a otra persona que se percibe como víctima, sobre la cual se ejerce un sometimiento que perpetua su evolución violenta y su incidencia. La problemática se presenta en diversos países y culturas y en Colombia ya han sido registrados en el presente año 8.981 casos a nivel de todo el territorio. En el distrito de Barranquilla el fenómeno presenta una prevalencia de 1.330, lo cual dio lugar al planteamiento de la investigación, que tuvo como objetivo, estudiar los efectos de un programa de aceptación social basado en la resiliencia en un grupo de estudiantes. La metodología se planteó con un enfoque cuantitativo ycon un diseño cuasiexperimental longitudinal, con observación antes (pre test) y observación después (postest) de la intervención del programa. Se llevo a cabo unmuestreo intencional con una participación de 26 estudiantes, 13 conformaron grupo control y 13 el grupo experimental, del grado 8 de básica secundaria con problemas de convivencia registrados por la dirección escolar.Se les aplico la escala CIE-Abreviada. Los resultados revelaron que la intervención llevada a cabo redujo significativamente el comportamiento agresivo entre pares y las conductas de rechazo que mantenían el bullying y el mobbing, Se intensifico la inclusión social, la participación positiva dentro del grupo y la convivencia. El análisis estadístico se realizó con la aplicación de la prueba T de student

Effects of organic wastes on olive mineral nutrition and its influence on fruit quality, preliminary results for macronutrients

ISHS Acta Horticulturae 512: XXV International Horticultural Congress, Part 2: Mineral Nutrition and Grape and Wine Quality. 8 Pag., 6 Fig. The definitive version is available at: http://www.actahort.org/The effect of pig slurry fertilization on two olive (Olea europaea L. cv. Empeltre) groves has been studied for one season. The dosage of landsprayed slurry was 15 and 30 m3ha-1 for a non-irrigated olive grove, which was in a bearing year and 30 and 60 m3ha-1 for an irrigated grove in a non-bearing year. The macronutrient seasonal trend, both young (less than a year old) and old (older than one year), was studied from February until December. The evolution curves of the macronutrients from young and old leaves showed the same tendency, although the concentrations in young leaves were usually greater than old leaves, except for calcium. The macronutrient evolution curves of olive fruits have been also studied. The results showed that this kind of fertilization did not lead to significant increases in mineral leaf concentrations in this first year trial of slurry fertilization.Research work is supported by the Diputación General de Aragón. Spain (Projects PCAI394 and P29/97 1).Peer reviewe

Prevalencia de la conducta prosocial según sexo y edad en una muestra de estudiantes colombianos

El presente estudio pretende analizar la conducta prosocial teniendo en cuenta las diferencias estadísticas según género y edad en población adolescente de estudiantes de tres colegios de la zona metropolitana de Bucaramanga, Colombia. La conducta prosocial fue codificada con el Teenage Inventory of Social Skills, que evalúa la conducta prosocial y agresiva de los adolescentes en las relaciones con sus iguales. El 50,4% de estudiantes de la investigación fueron identificados como prosociales. El análisis de proporciones reveló una prevalencia significativamente superior en conducta prosocial en las chicas que en los chicos. Con el paso de los años se produce un cambio de tendencia en la frecuencia de los estilos interpersonales, aunque la prosociabilidad es más frecuente a los 17 años.This study aims to analyze the prosocial behavior taking into account the statistical differences by gender and age in adolescent population of students from three schools in the metropolitan area of Bucaramanga, Colombia. Prosocial behavior was coded with the Teenage Inventory of Social Skills, which assesses prosocial and aggressive behavior in adolescent peer relationships. 50.4% of students in the research were identified as prosocial. The ratio analysis revealed a significantly higher prevalence in prosocial behavior in girls than in boys. Over the years, a shift in the frequency of interpersonal styles occurs, although prosociabili- dad is more common at age 17.peerReviewe

Discovering Rehabilitation trends in Spain: A bibliometric analysis

The main purpose of this study is to offer an overview of the rehabilitation research area in Spain from 1970 to 2018 through a bibliometric analysis. Analysis of performance and a co-word science mapping analysis were conducted to highlight the topics covered. The software tool SciMAT was used to analyse the themes concerning their performance and impact measures. A total of 3,564 documents from the Web of Science were retrieved. Univ Deusto, Univ Rey Juan Carlos and Basque Foundation for Science are the institutions with highest relative priority. The most important research themes are IntellectualDisability, Neck-Pain and Pain

Amphibians and reptiles associated with the prairie dog grasslands ecosystem and surrounding areas at the janos casas grandes complex, Northwestern Chihuahua, México

Prairie dogs (Cynomys ludovicianus) are considered a keystone species that forms extensive colonies in the grasslands of western and central North America. These colonies are characterized byhigh diversity of associated vertebrates. The largest colonies in North America are located in the Janos region, northwestern Chihuahua, Mexico. In this study we present an inventory of the amphibians and reptiles inhabiting at prairie dog grasslands and surrounding mesquite scrublands in the Janos region. Methods to assess the herpetofauna included the use of a combined system of pitfall traps and visual encounter surveys (VES). We found 9 species of amphibians and 35 of reptiles. Of these species, 28 were closely related to prairie dog colonies, and 18 were exclusively recorded in this habitat. Additionally, 13 species were restricted to the mesquite scrubland. The Janos amphibian and reptile communities are of conservation concern, because 16 of the included species (1 amphibian and 15 reptiles) are considered at some risk of extinction. The diversity of amphibians and reptiles in the Janos region is clearly high in comparison with other grasslands. Our results strongly support the assumption that prairie dog grasslands are important for maintaining the mammal and avian diversity in the ecosystems of the Chihuahuan desert

Las Patronas e sua construção de agencia em torno a migração centro-americana em trânsito por México

In a context in which migration policies are increasingly severe, searching to limit the mobility of people, especially those who have non-business or high-income tourism purposes, discrimination, criminalization, and violence emerge towards those who do not have the "established requirements". As a counterbalance, the emergence of civil society collectives that build support or assistance networks for vulnerable migrants is worth noting. With the information obtained through a multi-sited ethnography and taking as analytical reference the agency and experience proposed by Norman Long, this article presents the case of Las Patronas and their actions around Central American transit migration through Mexico. The women, Las Patronas, are transforming the reality of migrants in transit and their community. Their actions on behalf of migrants in transit have gradually become a focus (and a role model) for other groups, volunteers, and even institutions at the national or international levels. Hence, its community has little by little benefited from the actions of Las Patronas and external agents.En un contexto donde las políticas migratorias son cada vez más severas para limitar la movilidad de gente de bajos o nulos recursos que viajan de un país a otro sin documentos de migración “requeridos” para trabajar o escapar de circunstancias de violencia, opera fuertemente la discriminación, criminalización y violencia hacia tales personas; pero, como contrapeso, también surgen colectivos de la sociedad civil que construyen redes de apoyo hacia quienes migran en situación de vulnerabilidad. Con información obtenida a través de una etnografía multisituada y tomando como referencial analítico la capacidad de agencia y la experiencia, propuestas por Norman Long, en este artículo se presenta el caso de Las Patronas y sus acciones en torno a la migración centroamericana de tránsito por México. estas mujeres, están transformando la realidad no solo de los migrantes en tránsito, también de su comunidad. A partir de sus acciones en pro de los migrantes de paso se han convertido poco a poco en centro de atención (y ejemplo a seguir) para otros colectivos, voluntarios e incluso instituciones a nivel nacional e internacional; de ahí que, poco a poco, su comunidad se ha visto beneficiada por acciones de ellas y de agentes externos.Em um contexto em que as politicas migratórias são cada vez mais restritas visando limitar a mobilidade das pessoas, principalmente daquelas que são realizadas com fins não comercias ou de turismo de alta renda, as consequências tem sido a discriminação, criminalização e a violência para quem não têm os “requisitos estabelecidos”. Como contrapeso, é preciso sinalizar a emergência de coletivos da sociedade civil que constroem redes de apoio para quem migra em situação de vulnerabilidade. Com informação obtida através de uma etnografia multisituada e tendo como referencial analítico a capacidade de agência e a experiência, proposta por Norman Long, este artigo apresenta o caso de “Las Patronas” e suas ações em torno da migração centro-americana em trânsito por México. As mulheres, “Las Patronas”, estão transformando a realidade não apenas dos migrantes em trânsito, embora também da sua comunidade. A partir das suas ações em beneficio dos migrantes de passagem se tornaram gradualmente o centro das atenções (e um exemplo a seguir) para outros coletivos, voluntários e até instituições de nível nacional e internacional; assim, sua comunidade tem se beneficiado aos poucos das ações de “Las Patronas” e de agentes externos