La musique, l’auditeur et la radio des années trente : histoire et répertoire de la Radio Suisse romande

La version intégrale de ce mémoire est disponible uniquement pour consultation individuelle à la Bibliothèque de musique de l’Université de Montréal (www.bib.umontreal.ca/MU).

Growth and Characterisation of Radio Frequency Magnetron Sputttered Indium Tin Oxide Thin Films

The increasing interest in the interaction of light with electricity and electronically active materials made the materials and techniques for producing semitransparent electrically conducting films particularly attractive. Transparent conductors have found major applications in a number of electronic and optoelectronic devices including resistors, transparent heating elements, antistatic and electromagnetic shield coatings, transparent electrode for solar cells, antireflection coatings, heat reflecting mirrors in glass windows and many other. Tin doped indium oxide (indium tin oxide or ITO) is one of the most commonly used transparent conducting oxides. At present and likely well into the future this material offers best available performance in terms of conductivity and transmittivity combined with excellent environmental stability, reproducibility and good surface morphology. Although partial transparency, with a reduction in conductivity, can be obtained for very thin metallic films, high transparency and simultaneously high conductivity cannot be attained in intrinsic stoichiometric materials. The only way this can be achieved is by creating electron degeneracy in a wide bandgap (Eg > 3eV or more for visible radiation) material by controllably introducing non-stoichiometry and/or appropriate dopants. These conditions can be conveniently met for ITO as well as a number of other materials like Zinc oxide, Cadmium oxide etc. ITO shows interesting and technologically important combination of properties viz high luminous transmittance, high IR reflectance, good electrical conductivity, excellent substrate adherence and chemical inertness. ITO is a key part of solar cells, window coatings, energy efficient buildings, and flat panel displays. In solar cells, ITO can be the transparent, conducting top layer that lets light into the cell to shine the junction and lets electricity flow out. Improving the ITO layer can help improve the solar cell efficiency. A transparent ii conducting oxide is a material with high transparency in a derived part of the spectrum and high electrical conductivity. Beyond these key properties of transparent conducting oxides (TCOs), ITO has a number of other key characteristics. The structure of ITO can be amorphous, crystalline, or mixed, depending on the deposition temperature and atmosphere. The electro-optical properties are a function of the crystallinity of the material. In general, ITO deposited at room temperature is amorphous, and ITO deposited at higher temperatures is crystalline. Depositing at high temperatures is more expensive than at room temperature, and this method may not be compatible with the underlying devices. The main objective of this thesis work is to optimise the growth conditions of Indium tin oxide thin films at low processing temperatures. The films are prepared by radio frequency magnetron sputtering under various deposition conditions. The films are also deposited on to flexible substrates by employing bias sputtering technique. The films thus grown were characterised using different tools. A powder x-ray diffractometer was used to analyse the crystalline nature of the films. The energy dispersive x-ray analysis (EDX) and scanning electron microscopy (SEM) were used for evaluating the composition and morphology of the films. Optical properties were investigated using the UVVIS- NIR spectrophotometer by recording the transmission/absorption spectra. The electrical properties were studied using vander Pauw four probe technique. The plasma generated during the sputtering of the ITO target was analysed using Langmuir probe and optical emission spectral studies.

Characterization of radio frequency plasma using Langmuir probe and optical emission spectroscopy

The radio frequency plasma generated during the sputtering of Indium Tin Oxide target using Argon was analyzed by Langmuir probe and optical-emission spectroscopy. The basic plasma parameters such as electron temperature and ion density were evaluated. These studies were carried out by varying the RF power from 20 to 50 W. A linear increase in ion density and an exponential decrease in electron temperature with rf power were observed. The measured plasma parameters were then correlated with the properties of ITO thin films deposited under similar plasma conditions.

Studies on air pollution meteorology with special reference to Madras city

The main aim of the study is to give a clear picture of various meteorological factors affecting the dispersal of pollutants. One such important developing metropolis, namely Madras, is chosen for the present study. The study throws light into the occurrence of inversions, isothermals and lapse conditions and the vertical and horizontal extent of mixing of pollutants. The thesis also aims to study the wind climatology and atmospheric stability .The study gives a insight to the spatial distribution of sulphudioxide concentration using the Gaussian plume model, which accounts for various industrial sources. The researcher suggests optimum locations for industries and various steps to reduce air pollution.

Theoretical Studies on Air Pollution Meteorology in South India

Man's inadvertent interference with the environment by way of indiscreL¢ industrflflization has led to the deteriorating air quality in the recent times. The search is on to find the remedies to confine the air pollution levels with in their thershold limits. Theoretical studies play A crucial role in the control and for abatment of air pollution. Improper siting of industry is one of the most common reasons for the increased levels of air pollution in urban environments. A proper and effective ecological planning is an essential first step for any region in order to reduce the effects of air pollution. By means of theoretical models one can obtain the pollutant distribution in any urban area, provided the necessary data are available with the help of which the sites for new industries could be suggested, given the emission inventory. Studies on air pollution meteorology serve and aid the planners to initate remedial actions to bring down the levels of pollution and also to out—line the control strategy. In the present thesis some theoretical studies on air pollution meteorology over South India are made. The thesis is divided into six chapters

Variation in radio refractivity index associated with formation of low - pressure systems

Numerous low - pressure systems form in the Arabian Sea and Bay of Bengal. These low-pressure systems are highly useful in bringing the rainfall over the Indian sub continent. The developments of these systems are accompanied by the reduction in air temperature and an increase in atmospheric humidity. The radio refractivity, which is a function of the atmospheric pressure, temperature and humidity, also changes following the development of these systems. Variation of radio refractive index and its vertical gradient are analysed for many low pressure systems formed over the Arabian Sea and Bay of Bengal. It is found that the atmosphere becomes super refractive associated with the formation of these systems, caused by the increase in humidity and decrease in temperature. The maximum gradient is observed near the surface layers, especially in the lowest 1 km. Super refraction leads to increased radar detection range and extension of radio horizon

Determination of charge carrier transport in radio frequency plasma polymerized aniline thin films

The carrier transport mechanism of polyaniline (PA) thin films prepared by radio frequency plasma polymerization is described in this paper. The mechanism of electrical conduction and carrier mobility of PA thin films for different temperatures were examined using the aluminium–PA–aluminium (Al–PA–Al) structure. It is found that the mechanism of carrier transport in these thin films is space charge limited conduction. J –V studies on an asymmetric electrode configuration using indium tin oxide (ITO) as the base electrode and Al as the upper electrode (ITO–PA–Al structure) show a diode-like behaviour with a considerable rectification ratio

Virtual Radio Engine

Software Defined Radio (SDR) hardware platforms use parallel architectures. Current concepts of developing applications (such as WLAN) for these platforms are complex, because developers describe an application with hardware-specifics that are relevant to parallelism such as mapping and scheduling. To reduce this complexity, we have developed a new programming approach for SDR applications, called Virtual Radio Engine (VRE). VRE defines a language for describing applications, and a tool chain that consists of a compiler kernel and other tools (such as a code generator) to generate executables. The thesis presents this concept, as well as describes the language and the compiler kernel that have been developed by the author. The language is hardware-independent, i.e., developers describe tasks and dependencies between them. The compiler kernel performs automatic parallelization, i.e., it is capable of transforming a hardware-independent program into a hardware-specific program by solving hardware-specifics, in particular mapping, scheduling and synchronizations. Thus, VRE simplifies programming tasks as developers do not solve hardware-specifics manually.

Periódico Digital y Radio Sacapuntas en Internet.

Utilización de las TICs en las distintas áreas de conocimiento y edición de un periódico escolar digital, así como la conexión de la emisora escolar para su escucha a través de internet incluida dentro de su página web.

Taller de nuevas tecnologías aplicadas a la radio.

El currículum de la asignatura de Música en cuarto de ESO desarrolla entre otras temáticas las nuevas tecnologías y los medios de comunicación. Sin que se obvie el hecho de que la totalidad del currículum se puede desarrollar a partir de este proyecto educativo. La idea ha consistido en impartir el temario de la asignatura de Música en cuarto curso de la ESO a partir de la confección de programas de radio a desarrollar en los recreos. De este modo se trabajó cada uno de los epígrafes del currículum, seleccionando aquellas audiciones a presentar al resto de compañeros del centro junto con música comercial. De esta forma han trabajado su música preferida y han integrado una tipología a la que el alumnado no tiene acceso y con la que deben familiarizarse para configurar un criterio estético más personal.

Prensa, radio y publicidad : medios de comunicación y áreas transversales en el aula de lengua.

El objetivo del presente trabajo es acercar al alumnado al conocimiento del mundo tan cercano y, a la vez, tan desconocido para la mayoría, que representan los medios de comunicación, para que puedan ser cada día más conscientes de la importancia de éstos. Los medios de comunicación están en la casa, en la calle, en todas partes. Raro es el lugar que se resiste a su poder de penetración. Forman parte imprescindible de la vida moderna, del progreso, y lo queramos o no vamos asimilando sus mensajes de manera más o menos consciente. Se puede y se debe comenzar el día relacionando al alumnado con su contexto más inmediato, es decir, comentando las noticias del momento, potenciando al mismo tiempo la comprensión de la realidad más inmediata. La prensa, la radio y la publicidad ayudan al profesorado a un tipo de enseñanza vinculada a la vida, pero no hay que olvidar que esto requiere a su vez de un gran esfuerzo y que no es tarea fácil.

Una experiencia asturiana de radio escolar : el programa Horizontes

En esta comunicaci??n se aborda un programa radiof??nico-escolar nacido en los primeros a??os de la fase tecnocr??tica del franquismo. El programa de radio Horizontes, iniciado en el curso 1954 y dirigido a la infancia asturiana, fue planteado para ser escuchado en las escuelas. El d??a de emisi??n el programa formaba parte de la actividad educativa de los escolares al ser sintonizado desde las aulas y posteriormente requerir los maestros actividades relacionadas con el contenido, tales como s??ntesis, redacciones, dibujos... o bien realizando las tareas propuestas en los concursos. No se trataba de un programa infantil al uso sino de un programa radiof??nico en horario lectivo para ni??os y maestros, cuyo contenido, a tono con la ??poca, no parece estar pensado s??lo para el entretenimiento o el adoctrinamiento pol??tico y religioso sino tambi??n para estimular el conocimiento de manera l??dica, fomentando la cultura de los escolares y de la poblaci??n. Resumen basado en la publicaci??n.

Radios estatales competitivas : Radio Nacional de Colombia y Radiónica, otra cara para la radio pública en Colombia

El proyecto se fundamenta en la creación de líneas estratégicas que permitan el sostenimiento y captación de audiencias de las emisoras Radio Nacional de Colombia y Radiónica. Por medio de un planteamiento estratégico se generan para este proyecto tres fases de implementación: Plan de medios, Segmentación de mercados y Realización de eventos en Cali, Medellín y Bogotá.

Alunizando, el magazine de los sesenta hoy. Una apuesta por una radio con magia

Alunizando, el magazine de los sesenta hoy, es un programa radial que pretende transportar al oyente a la época de su infancia y juventud, época de grandes transformaciones tanto para Colombia como para el mundo. Asimismo, busca indicar las causas o las raíces de los fenómenos y procesos que se viven hoy en día en el mundo. No sólo es un programa para los nostálgicos, sino también para aquellas personas interesadas en la historia, música, hechos y personajes de los sesenta, así como para quienes buscan una alternativa a los programas radiales convencionales. Al ser un magazine radial cuenta en su estructura con géneros periodísticos tales como: la noticia, el reportaje, la crónica, el perfil biográfico y un género dramático que es la radionovela.