Molecular breakdown of different forms of natural rubber and its influence on properties of their mixes and vulcanizates

The forms of natural rubber studied were sheet [RSS 4 and RSS 5], ISNR 20 and EBC. In the case of the latter two forms samples from estate and nonestate sectors were included. The samples were collected from different locations at specified intervals, for a particular period. The effect of the extent of mastication on raw rubber properties as well as the properties of the compounds and vulcanizates also studied. The consistency in raw rubber properties and breakdown behavior of skim rubber were studied by collecting samples periodically from selected processing units. The effect of incorporation of skim with ISNR 20 has also been investigated

Forms of Nitrogen (NO 3 - -N; NO 2 - -N and NH 2 CONH 2 -N) and their relations to A.O.U. in the Indian coastal waters of Arabian Sea

The distribution of three important dissolved forms of nitrogen, viz. nitrate, nitrite and urea in the surface and bottom water samples collected from 27 selected hydrographic profiles, in the Arabian Sea, along the west coast of India is described. Of the three forms, nitrate concentrations were the highest and comparatively higher concentrations were observed in the bottom water. Decomposition of organic matter resulting in the release of the thermodynamically stable nitrogen species, i.e. nitrate, may be the major factor resulting in higher nitrate concentrations at these depths, where the water is also characterized by low values of dissolved oxygen and temperature. The significant positive correlation between A.O.U. and nitrate of the bottom water samples emphasizes the role of oxidative decomposition of organic matter which plays an active role in reducing the oxygen concentrations below the theoretical values since at this depth ( 200 m) the net production is taken to be zero. This is also evidenced by the negative correlation of nitrate with dissolved oxygen and temperature, for the bottom samples

Towards Realization of Magnetocaloric and Magnetoelectric Applications based on Bulk and Thin film forms of Sodium substituted Lanthanum Manganites

The present thesis work focuses on hole doped lanthanum manganites and their thin film forms. Hole doped lanthanum manganites with higher substitutions of sodium are seldom reported in literature. Such high sodium substituted lanthanum manganites are synthesized and a detailed investigation on their structural and magnetic properties is carried out. Magnetic nature of these materials near room temperature is investigated explicitly. Magneto caloric application potential of these materials are also investigated. After a thorough investigation of the bulk samples, thin films of the bulk counterparts are also investigated. A magnetoelectric composite with ferroelectric and ferromagnetic components is developed using pulsed laser deposition and the variation in the magnetic and electric properties are investigated. It is established that such a composite could be realized as a potential field effect device. The central theme of this thesis is also on manganites and is with the twin objectives of a material study leading to the demonstration of a device. This is taken up for investigation. Sincere efforts are made to synthesize phase pure compounds. Their structural evaluation, compositional verification and evaluation of ferroelectric and ferromagnetic properties are also taken up. Thus the focus of this investigation is related to the investigation of a magnetoelectric and magnetocaloric application potentials of doped lanthanum manganites with sodium substitution. Bulk samples of sodium substituted lanthanum manganites. Bulk samples of sodium substituted lanthanum manganites with Na substitution ranging from 50 percent to 90 percent were synthesized using a modified citrate gel method and were found to be orthorhombic in structure belonging to a pbnm spacegroup. The variation in lattice parameters and unit cell volume with sodium concentration were also dealt with. Magnetic measurements revealed that magnetization decreased with increase in sodium concentrations.

Architecture and other Architectures: Mapping the Production of Insular Space in the Pearl River Delta (China) and Jakarta (Indonesia)

Globalization is widely regarded as the rise of the borderless world. However in practice, true globalization points rather to a “spatial logic” by which globalization is manifested locally in the shape of insular space. Globalization in this sense is not merely about the creation of physical fragmentation of space but also the creation of social disintegration. This study tries to proof that global processes also create various forms of insular space leading also to specific social implications. In order to examine the problem this study looks at two cases: China’s Pearl River Delta (PRD) and Jakarta in Indonesia. The PRD case reveals three forms of insular space namely the modular, concealed and the hierarchical. The modular points to the form of enclosed factories where workers are vulnerable for human-right violations due to the absent of public control. The concealed refers to the production of insular space by subtle discrimination against certain social groups in urban space. And the hierarchical points to a production of insular space that is formed by an imbalanced population flow. The Jakarta case attempts to show more types of insularity in relation to the complexity of a mega-city which is shaped by a culture of exclusion. Those are dormant and hollow insularity. The dormant refers to the genesis of insular– radical – community from a culture of resistance. The last type, the hollow, points to the process of making a “pseudo community” where sense of community is not really developed as well as weak social relationship with its surrounding. Although global process creates various expressions of territorial insularization, however, this study finds that the “line of flight” is always present, where the border of insularity is crossed. The PRD’s produces vernacular modernization done by peasants which is less likely to be controlled by the politics of insularization. In Jakarta, the culture of insularization causes urban informalities that have no space, neither spatially nor socially; hence their state of ephemerality continues as a tactic of place-making. This study argues that these crossings possess the potential for reconciling venue to defuse the power of insularity.

Effects of manure quality and application forms on soil C and N turnover of a subtropical oasis soil under laboratory conditions

Our knowledge of the agricultural sustainability of the millennia-old mountain oases in northern Oman is restricted in particular with respect to C and N turnover. A laboratory study was conducted (1) to analyse the effects of rewetting and drying on soil microorganisms after adding different manures, (2) to investigate the effects of mulching or incorporating of these manures, and (3) to evaluate the relationships between C and N mineralisation rates and manure quality indices. During the first 9-day rewetting and drying cycle, i.e. the “mulch” period, the content of extractable organic C decreased by approximately 40% in all four treatments. During the second 9-day rewetting and drying cycle, i.e. the “incorporation” period, this fraction decreased insignificantly in almost all treatments. The control and mature manure treatments form the first pair with a low percentage of total organic C evolved as CO2 (0.3% in 18 days) and a considerable percentage of total N mineralised as NH4 and NO3 (1% in 18 days), the fresh and immature manure treatments form the second pair with a higher amount of total organic C evolved as CO2 (0.5% in 18 days) and no net N mineralisation. During the first 9-day rewetting and drying cycle, the contents of microbial biomass C and biomass N increased by approximately 150% in all four treatments. During the second 9-day rewetting and drying cycle, no further increase was observed in the control and immature manure treatments and a roughly 30% increase in the other two treatments.

Evaluación del programa modular de autoaprendizaje Cómo buscar empleo.

1. Fundamentar el programa de orientación profesional 'Cómo buscar un empleo' desde un punto de vista teórico-científico. 2. Evaluarlo como instrumento potente capaz de dotar al individuo de las competencias implicadas en la tarea de buscar empleo.. 50 personas inscritas en la oficina de empleo, divididas en dos grupos: grupo 1 (aprendizaje grupal) y grupo 2 (autoaprendizaje) compuestos por 16 y 34 sujetos respectivamente.. Se analiza un primer plan piloto de intervención formativa con dos grupos sometidos cada uno a un tipo de tratamiento y se obtienen unos resultados. Se trata de comprobar si hay cambios y si éstos están en relación con las hipótesis de partida. Se elabora un cuestionario de conocimientos en la búsqueda de empleo y se aplica a todos los sujetos de los dos grupos antes y después de la intervención.. Diferencial semántico de Osgood para analizar la actitud hacia el programa aplicado. Cuestionario de conocimientos en la búsqueda de empleo.. Análisis del rendimiento: análisis de equivalencia entre ambos grupos en el pretest, análisis de diferencias entre ambos grupos en el posttest, análisis de la ganancia media pretest-posttest en el grupo 1 y 2. Análisis de actitudes: contraste de medias.. Análisis del rendimiento: no existen diferencias significativas en la variable dependiente en el pretest entre ambos grupos. Existen diferencias en la variable dependiente en el pretest entre ambos grupos a favor del grupo tratado con aprendizaje formal. Tanto los sujetos del grupo 1 como los del grupo 2 son significativamente mejores en la variable dependiente en el posttest que el pretest. Análisis de las actitudes: existen diferencias significativas en las escalas práctico-teórico, pasivo-activo, útil-inútil, malo-bueno, estático-dinámico y oportuno-inoportuno en cuanto a actitudes hacia el programa entre los dos grupos a favor del grupo 1 que puntúa más alto en estas escalas.. 1. El programa parece adaptado al nivel de estudios de la muestra. 2. Todo el material es bien recibido. 3. La aplicación del programa produce una mejora, sobre todo en conocimientos. 4. Los resultados obtenidos en el grupo 1 tratado con aprendizaje grupal resultan ser mejores, tanto en conocimientos como en actitudes, hacia el programa que los obtenidos en el grupo 2 tratado con autoaprendizaje. En posteriores estudios se procurará dar continuidad y profundización al presente trabajo en los aspectos siguientes: ver si las conclusiones se corroboran en otros grupos; hacer un seguimiento de los sujetos diana para ver si las modificaciones derivadas del tratamiento tienen una relación demostrable con el paso del tiempo; determinar modificaciones o tratamientos diferenciales a introducir en algunos módulos del programa; comprobar qué competencias se logran más y cuáles menos con el programa; tratar de probar nuevas metodologías, tales como los sistemas interactivos..

Design and Development of 3-DOF Modular Micro Parallel Kinematic Manipulator

This paper presents the research and development of a 3-legged micro Parallel Kinematic Manipulator (PKM) for positioning in micro-machining and assembly operations. The structural characteristics associated with parallel manipulators are evaluated and the PKMs with translational and rotational movements are identified. Based on these identifications, a hybrid 3-UPU (Universal Joint-Prismatic Joint-Universal Joint) parallel manipulator is designed and fabricated. The principles of the operation and modeling of this micro PKM is largely similar to a normal size Stewart Platform (SP). A modular design methodology is introduced for the construction of this micro PKM. Calibration results of this hybrid 3-UPU PKM are discussed in this paper.

Desarrollo de la teoría modular aplicada al desarrollo curricular.

Estudiar la teoría modular de desarrollo curicular basada en la utilización de paquetes curriculares de aprendizaje y presentar un desarrollo práctico de una programación a partir de los sistemas de paquetes curriculares. Se hace en primer lugar un estudio teórico de la teoría modular y de otro modelo curricular denominado cognitivo. Se hace un estudio comparativo de ambos modelos viendo lo que aporta cada uno de ellos y por ultimo se presenta un ejemplo de programación de un paquete curricular. Tras este estudio teórico sería conveniente llevar a la práctica esta teoría con un grupo de alumnos y comparar con otros grupos que tengan otras programaciones para hacer comparaciones estadísticas de los datos.

Cognitive appraisals, emotional reactions, and their associations with three forms of peer-victimization

Resumen tomado de la publicaci??n

Forms of ethnic prejudice : Assessing the dimensionality of a Spanish-language version of the Blatant and Subtle Prejudice Scale

Resumen tomado de la publicaci??n

Forms of Student Engagement: development and application of the Southampton post-course research (UKSE) iSurvey for a traditionally taught module

Forms of Student Engagement: development and application of the Southampton post-course research (UKSE) iSurvey for a traditionally taught module

Capacidades dinámicas; la fuente de sostenibilidad ante el cambio

Las capacidades dinámicas constituyen un aporte importante a la estrategia empresarial. De acuerdo con esta premisa se desarrolla el siguiente documento, al reconocer que la generación de competencias se consolida como la base teórica para el logro de sostenibilidad ante eventos de cambio que puedan afectar la estabilidad y la toma de decisiones de las organizaciones. Dada la falta de aplicación empírica del concepto se ha elaborado este paper, en el que se demuestran e identifican las herramientas que la aplicación empiríca puede dar a las organizaciones y los instrumentos que proveen para la generación de valor. A través del caso de estudio ASOS.COM se ejemplifica la necesidad de detección y aprovechamiento de oportunidades y amenazas, así como la reconfiguración, renovación y generación de competencias de segundo orden para enfrentar el cambio. De esta manera por medio de las habilidades creadas al interior de las empresas con enfoque en el aprendizaje e innovación se logra la comprensión del negocio y el afianzamiento de mejores escenarios futuros.

Investigaci??n sobre un posible modelo para el desarrollo modular de la ense??anza de la Filosof??a en el nuevo Bachillerato

El objeto de la investigaci??n es el dise??o de un modelo modular para la ense??anza de la Filosof??a en el nuevo Bachillerato, as?? como la elaboraci??n de un material y una metodolog??a espec??ficas que permitan aplicar en la pr??ctica dicho modelo. Aplicado a 100 alumnos de primero de BUP del IBAD de Las Palmas y llevado a cabo por un solo profesor. En cuanto al contenido, los n??cleos tem??ticos se estructuraron en tres m??dulos: I. Ontolog??a-Ciencia. II. ??tica-Pol??tica. III. Experiencia est??tica. La metodolog??a llevada a cabo consist??a en la elaboraci??n y utilizaci??n de un nuevo material impreso, combinado con otros de tipo audiovisual e inform??tico. En la memoria no se especifican resultados.

Sistema modular para adultos.

Proyecto de carácter no académico en la Educación de Adultos, estructurado en módulos, de tal modo que facilite al adulto la obtención de un título de Certificado o de Graduado Escolar, o bien, para obtener un mayor conocimiento de materias que son básicas en el mundo del trabajo. El proyecto se llevó a cabo en las aulas de los centros Teológico, Rehoyas, Batán y Suárez Naranjo. Resultados: En el Centro Teológico: alumnos con niveles muy dispares; alrededor de un 68 por ciento supera las pruebas de acceso para mayores de 25 años. Centro Rehoyas: alumnos con nivel muy bajo; la finalidad es la promoción social; a nivel académico están situados entre los neolectores y el certificado de escolaridad. Centro El Batán: el 17 por ciento obtuvo el Graduado. Centro Suárez Naranjo: el 52,5 por ciento obtuvo el Graduado Escolar. El aula del Centro Teológico parece ser la más completa, ya que dispone de más recursos que el resto de los centros.