Biochemical and Biotechnological investigations on the water-fern Salvinia molesta Mitchell

The present work is focussed mainly on the utilization of this weed-biomass on a biochemical and biotechnological basis. Before designing scientific and systematic utilization of any given biomass, the detailed analysis of its chemical componets is essential. Hence, as the preliminary part of the experimental works, samples of Salvinia were analysed for its chemical constituents.Before designing scientific and systematic utilization of any given biomass, the detailed analysis of its chemical componets is essential .The composition of the substrate contributes much to the nutritive value of mushrooms. Hence, alterations in the nutritive value of mushrooms (in terms of total carbohydrates, proteins, lipids and minerals) in response to Salvinia as substrate were analyzed.Substrate after mushroom harvest (spent substrate) can be utilized for various purposes such as cattle feed, as a source of degradative enzymes, as a substrate for other mushrooms and as garden manure. But studies are limited with regard to the utilization of Pleurotus spent substrate as garden manure. So the value of spent substrate as an organic supplement and its multidimensional impacts on soil chemical status, soil microbial population dynamics and plant growth (Amhurium andreanum) were carried out.Major findings of this work have got much relevance in designing measures to utilize different types of plant biomass, especially aquatic weeds, with the aid of a powerful biological tool, the lignocellulolytic fungus, Pleurorus

Thermohaline variability in the upper layers of the Arabian Sea

The Arabian Sea is an area of complex air-sea interaction processes with seasonal reversing monsoons. The associated thermohaline variability in the upper layers appears to control the large scale monsoon flow which is not yet completely understood. The variability in the thermohaline fields is known to occur in temporal domain ranging from intra-diurnal to inter-annual time scales and on spatial domains of few tens of kilometers to few thousands of kilometers. In the Arabian Sea though the surface temperature was routinely measured by both conventional measurements and satellites, the corresponding information on the subsurface thermohaline field is very sparse due to the lack cw adequate measurements. In such cases the numerical models offer promise in providing information on the subsurface features given an initial thermohaline field and surface heat flux boundary conditions. This thesis is an outcome of investigations carried out on the various aspects of the thermohaline variability on different time scales. In addition to the description of the mean annual cycle. the one dimensional numerical models of Miller (1976) and Price et a1 (1986) are utilised to simulate the observed mixed layer characteristics at selected locations in the Arabian Sea on time scales ranging from intra-diurnal to synoptic scales under variable atmospheric forcing.

Studies on High- Tc Superconductors with Inequivalent Conducting Layers

The thesis deals with the study of super conducting properties of layered cuprates within the frame work of a modified Lawrence-Doniach (LD) model. The thesis is organized in seven chapters. Chapter I is a survey of the phenomena and theories of conventional superconductivity which can serve as a springboard for launching the study of the new class of oxide superconductors and it also includes a chronological description of the efforts made to overcome the temperature barrier. Chapter II deals with the structure and properties of the copper oxide superconductors and also the experimental constraints on the theories of high te:::nperature superconductivity. A modified Lawrence-Doniach type of phenomenological model which forms the basis of the presnt study is also discussed. In chapter III~ the temperature dependence of the upper critical field both parallel and perpendicular to the layers is determined and the results are compared with d.c. magnetization measurements on different superconducting compoilllds. The temperature and angular dependence of the lower critical field both parallel and perpendicular to the layers is also discussed. Chapters IV, V and VI deal with thermal fluctuation effects on superconducting properties. Fluctuation specific heat is studied in chapter IV. Paraconductivity both parallel and perpendicular to the layers is discussed in chapter V. Fluctuation diamagnetism is dealt with in chapter VI. Dimensional cross over in the fluctuation regime of all these quantities is also discussed. Chapter VII gives a summary of the results and the conclusions arrived at.

Optimization of parameters of chemical spray pyrolysis technique to get n and p-type layers of SnS

SnS thin films were prepared using automated chemical spray pyrolysis (CSP) technique. Single-phase, p-type, stoichiometric, SnS films with direct band gap of 1.33 eV and having very high absorption coefficient (N105/cm) were deposited at substrate temperature of 375 °C. The role of substrate temperature in determining the optoelectronic and structural properties of SnS films was established and concentration ratios of anionic and cationic precursor solutions were optimized. n-type SnS samples were also prepared using CSP technique at the same substrate temperature of 375 °C, which facilitates sequential deposition of SnS homojunction. A comprehensive analysis of both types of films was done using x-ray diffraction, energy dispersive x-ray analysis, scanning electron microscopy, atomic force microscopy, optical absorption and electrical measurements. Deposition temperatures required for growth of other binary sulfide phases of tin such as SnS2, Sn2S3 were also determined

Anisotropic adaptive resolution of boundary layers for heat conduction problems

We deal with the numerical solution of heat conduction problems featuring steep gradients. In order to solve the associated partial differential equation a finite volume technique is used and unstructured grids are employed. A discrete maximum principle for triangulations of a Delaunay type is developed. To capture thin boundary layers incorporating steep gradients an anisotropic mesh adaptation technique is implemented. Computational tests are performed for an academic problem where the exact solution is known as well as for a real world problem of a computer simulation of the thermoregulation of premature infants.

Manuel Fern??ndez de Castro : materiales did??uticos. 'Manuel Fern??ndez de Castro : materiales did??cticos'

Con motivo de dedicarse la XVIII Selmana de les Lletres Asturianes de 1997 a la figura y a la obra de Manuel Fern??ndez de Castro se elaboraron unos materiales did??cticos destinados a los centros de ense??anza secundaria donde se imparte la optativa de lengua asturiana. Este autor del siglo XIX, traductor y poeta principalmente de textos religiosos sirve como ejemplo para valorar el trabajo del traductor como instrumento indispensable en la normalizaci??n de una lengua. Se hacen una serie de propuestas organizadas alrededor de unos centros de inter??s; las actividades se plantean desde una perspectiva interdisciplinar como v??a de integraci??n de la lengua asturiana en el curr??culo de secundaria. Los tres bloques que se trabajan son: 1-El tiempo que le toc?? vivir a Manuel Fern??ndez de Castro. 2-El ambiente literario que rodea la obra del autor. 3-La obra de Fern??ndez de Castro y la traducci??n al asturiano. Se presenta una selecci??n de textos, actividades como rellenar cuadros, esquemas, resolver pasatiempos de contenido literario, etc. Finalmente se ofrece como ejemplo de una futura serie, un material en el que unas fichas gr??ficas con un personaje central llamado Marga, sirvi??ndose en este caso de la figura de Fern??ndez de Castro y su obra en asturiano, propone actividades al alumnado del primer ciclo de Secundaria y de los cursos m??s altos de la Ense??anza Primaria.

Fern??ndez de Lizardi y la necesidad ilustrada de la educaci??n civil y pol??tica

Resumen tomado de la publicaci??n

Adobe Photoshop : Adjustment and Fill Layers

Find out more about Photoshop Adjustment and Fill Layers with this share of video tutorials.

Ermitas Fern??ndez Fern??ndez : la educaci??n en las aldeas gallegas

Se presenta el perfil personal y profesional de Ermitas Fern??ndez Fern??ndez. Para ella, los entornos rurales son un medio rico y estimulante para el aprendizaje. Lleva m??s de treinta a??os dedicada a la educaci??n del medio rural gallego y a conseguir que las familias tomen conciencia del valor de su trabajo como educadoras de sus hijos. Empez?? trabajando en la escuela unitaria de Maderne, en A Fonsagrada, Lugo, donde, en contacto con maestros de Acci??n Cat??lica, pondr?? en pr??ctica modelos organizativos innovadores, convirtiendo el aula en un espacio de libertad a trav??s de la conversaci??n y el di??logo. Trabajar?? con chicos y chicas que han abandonado la escuela en las llamadas actividades de noche; con los padres, dentro del programa de Extensi??n Agraria ofreciendo actividades orientadas a mejorar su nivel cultural; y luchar?? contra la discriminaci??n y la falta de integraci??n de la mujer en estas actividades. En contacto con Antonio Gandoy, secretario de Acci??n Social de C??ritas de Galicia, se embarcar?? en el proyecto de Preescolar na Casa, y desarrollar?? un intenso trabajo de investigaci??n y expansi??n del programa en colaboraci??n con otros pa??ses como Francia e Italia.

Visi??n tecnol??gica de la did??ctica : aportaci??n de los doctores Fern??ndez Huerta y Rodr??guez Di??guez

Los doctores Fern??ndez Huertas y Rodr??guez Di??guez han constituido el eje de la did??ctica en Espa??a durante la segunda mitad del siglo XX y los primeros a??os del siglo XXI. Sus obras han constituido la base de la did??ctica y de los modelos de formaci??n del profesorado. El conocimiento de los dos maestros permite profundizar en la visi??n de la tecnolog??a de la Did??ctica. La Did??ctica, como disciplina social inmersa en la sociedad de la informaci??n, no puede renunciar a su sistematizaci??n tecnol??gica. Adem??s de tratar la Did??ctica desde un enfoque tecnol??gico, se analizan las aportaciones del modelo did??ctico establecido por Fern??ndez Huertas y Rodr??guez Di??guez.

Los maestros mexicanos en tiempos de Fern??ndez de Lizardi (1776-1827)

Resumen tomado de la publicaci??n

Lope ante Fern??n Gonz??lez a la luz del arte nuevo

Se examina la leyenda ??pica de Fern??n Gonz??lez, a trav??s de la obra teatral de Lope de Vega, El conde Fern??n Gonz??lez, de 1623. Se diferencian los distintos elementos de la tragicomedia, el estilo barroco y la estructura de la obra, su versificaci??n, la presencia de los ideales de los siglos de oro, la conservaci??n de la tradici??n de los condes castellanos y las novedades introducidas en la acci??n, como el tema campesino unido al ??pico.

Layers of generality and types of generalization in pattern activities. 'Niveles de generalidad y tipos de generalizaciones en actividades de patrones'.

Resumen basado en el de la publicación