The Effect of Periodic Silane Burst on the Properties of GaN on Si (111) Substrates

The periodic silane burst technique was employed during metalorganic chemical vapor deposition of epitaxial GaN on AlN buffer layers grown on Si (111). Periodic silicon delta doping during growth of both the AlN and GaN layers led to growth of GaN films with decreased tensile stresses and decreased threading dislocation densities, as well as films with improved quality as indicated by x-ray diffraction, micro-Raman spectroscopy, atomic force microscopy, and transmission electron microscopy. The possible mechanism of the reduction of tensile stress and the dislocation density is discussed in the paper.

Inputs for the incorporation of the UNESCO guidelines on ICT competency standards for teachers : the training of teachers of mathematics in Central America

Resumen tomado de la publicaci??n

Introduction to Network Mathematics

Introduction to Network Mathematics provides college students with basic graph theory to better understand the Internet

School of Mathematics Computing Guide

Guide for computing in the School of Mathematics. Intended for new staff and PG students. Originally written by Anton Prowse from a number of earlier documents.

WAIS seminar:Mathematics for Web Science Part3-1

ABSTRACT In the first two seminars we looked at the evolution of Ontologies from the current OWL level towards more powerful/expressive models and the corresponding hierarchy of Logics that underpin every stage of this evolution. We examined this in the more general context of the general evolution of the Web as a mathematical (directed and weighed) graph and the archetypical “living network” In the third seminar we will analyze further some of the startling properties that the Web has as a graph/network and which it shares with an array of “real-life” networks as well as some key elements of the mathematics (probability, statistics and graph theory) that underpin all this. No mathematical prerequisites are assumed or required. We will outline some directions that current (2005-now) research is taking and conclude with some illustrations/examples from ongoing research and applications that show great promise.

WAIS seminar:Mathematics for Web Science Part 3-2

ABSTRACT In the first two seminars we looked at the evolution of Ontologies from the current OWL level towards more powerful/expressive models and the corresponding hierarchy of Logics that underpin every stage of this evolution. We examined this in the more general context of the general evolution of the Web as a mathematical (directed and weighed) graph and the archetypical “living network” In the third seminar we will analyze further some of the startling properties that the Web has as a graph/network and which it shares with an array of “real-life” networks as well as some key elements of the mathematics (probability, statistics and graph theory) that underpin all this. No mathematical prerequisites are assumed or required. We will outline some directions that current (2005-now) research is taking and conclude with some illustrations/examples from ongoing research and applications that show great promise.

WAIS seminar: Mathematics for Web Science: Part 3-3

ABSTRACT In the first two seminars we looked at the evolution of Ontologies from the current OWL level towards more powerful/expressive models and the corresponding hierarchy of Logics that underpin every stage of this evolution. We examined this in the more general context of the general evolution of the Web as a mathematical (directed and weighed) graph and the archetypical “living network” In the third seminar we will analyze further some of the startling properties that the Web has as a graph/network and which it shares with an array of “real-life” networks as well as some key elements of the mathematics (probability, statistics and graph theory) that underpin all this. No mathematical prerequisites are assumed or required. We will outline some directions that current (2005-now) research is taking and conclude with some illustrations/examples from ongoing research and applications that show great promise.

Impact on the quality of learning as a result of the use of computers in schools

The educational software and computer assisted learning has been used in schools to promote the interest of students in new ways of thinking and learning so it can be useful in the reading learning process. Experimental studies performed in preschool and school age population have shown a better yield and a positive effect in reading, mathematics and cognitive skills in children who use educative software for fi fteen to twenty minutes a day periods. The goal of this study was to evaluate the progression in verbal, visual-motor integration and reading skills in children who were using educational software to compare them with a group in traditional pedagogic methodology. Results: All children were evaluated before using any kind of pedagogic approach. Initial evaluation revealed a lower–age score in all applied test. 11% of them were at high risk for learning disorders. There was a second evaluation that showed a significant positive change compared with the fi rst one. Nevertheless, despite some items, there were no general differences comparing the groups according if they were using or not a computer. In conclusion, policies on using educational software and computers must be revaluated due to the fact that children in our public schools come from a deprived environment with a lack of opportunities to use technologies.

Proyecto 'mete' (mathematics education traditions of europe) : el foco matem??tico

Se presentan los resultados de un estudio sobre las tradiciones de ense??anza en varios pa??ses europeos. Dichos pa??ses son B??lgica, Inglaterra, Hungr??a y Espa??a. Se realiza un estudio a peque??a escala en el que se emplean m??todos cuantitativos y cualitativos. A lo largo del estudio, se tiene como objetivo sacar conclusiones que mejoren la ense??anza de las Matem??ticas. Dicho objetivo es siempre m??s prioritario que la obtenci??n de generalizaciones sobre la ense??anza. Se establecen comparaciones a trav??s de los resultados de varios tests y seobtienen unas conclusiones. A partir de las conclusiones, se extraen recomendaciones para los profesores con las que mejorar su experiencia docente.

Proyecto 'mete' (mathematics education traditions of europe) : pol??gonos en primaria

Se aborda el estudio comparativo de la ense??anza de la matem??tica en varios pa??ses europeos. Se estudia la ense??anza de los pol??gonos en primaria desde un punto de vista cuantitativo y cualitativo. Para el estudio se apoya en el an??lisis de cuatro unidades did??cticas puestas en pr??ctica por profesores de los correspondientes pa??ses. Se muestra la complementariedad de ambos tipos de datos y sus posibilidades para profundizar en la ense??anza de los pol??gonos.

Foundation mathematics : teaching the early years.

Es un nuevo recurso para la etapa de tres a cinco años. Está pensado para apoyar los objetivos de aprendizaje temprano y muestra a los niños cómo usar las matemáticas en el mundo real, además para trabajar con toda la clase cálculo mental, juego de roles en escenarios que proporcionan una variedad de contextos ricos en matemáticas. Los temas estimulan en los niños los propios intereses y el sentido de la curiosidad. Cada unidad dispone de : una serie progresiva de actividades para apoyar el desarrollo de los niños desde la enseñanza preescolar. Un alto nivel de apoyo para el profesional, para desarrollar las actividades y sugerencias para apoyar a los niños con capacidades diferentes.

Key Three Mathematics : the revision guide, levels 5-8.

Guía de revisión para la etapa clave tres (Key Stage 3) de matemáticas. Abarca el plan de estudios para estudiantes de once a catorce años (niveles 5-8). Contiene explicaciones detalladas de diferentes temas y términos técnicos. También incluye diagramas, así como un resumen de preguntas para poner a prueba lo que los niños han aprendido en cada sección.

Edexcel GCSE mathematics 16+.

Ayuda a los estudiantes a través de su curso de matemáticas en un año, ya sea nuevo o para repetir el examen del General Certificate of Secundary Education (GCSE). Proporciona cobertura de todos los temas esenciales de nivel intermedio. Ofrece apoyo completo a la enseñanza, para garantizar a los estudiantes comprender los conceptos clave y lograr mejores calificaciones. Incluye hojas de trabajo de ampliación para los que deseen practicar preguntas de nivel superior hasta el grado B. Los contenidos de este recurso son:Enteros. Fracciones. Decimales. Porcentajes. Razón y proporción. Álgebra. Fórmulas y expresiones. Ecuaciones. Gráficos lineales y cuadráticos. Desigualdades. Ángulos. Transformaciones. Medida. Pitágoras y trigonometría Recogida y organización de datos. Estadística. Diagramas de dispersión. Valores medios y de rango. Diagramas de frecuencia acumulada. Probabilidad.