Segunda parte del Nobiliario genealogico de los reyes y titulos de España... / compuesto por Alonso Lopez de Haro... I. de, imp. II. España, Madrid / compuesto por Alonso Lopez de Haro...

Port. con grab. xil. esc. real

Early dysfunction of functional connectivity in healthy elderly with subjective memory complaints

It is still an open question whether subjective memory complaints (SMC) can actually be considered to be clinically relevant predictors for the development of an objective memory impairment and even dementia. There is growing evidence that suggests that SMC are associated with an increased risk of dementia and with the presence of biological correlates of early Alzheimer's disease. In this paper, in order to shed some light on this issue, we try to discern whether subjects with SMC showed a different profile of functional connectivity compared with subjects with mild cognitive impairment (MCI) and healthy elderly subjects. In the present study, we compare the degree of synchronization of brain signals recorded with magnetoencephalography between three groups of subjects (56 in total): 19 with MCI, 12 with SMC and 25 healthy controls during a memory task. Synchronization likelihood, an index based on the theory of nonlinear dynamical systems, was used to measure functional connectivity. Briefly, results show that subjects with SMC have a very similar pattern of connectivity to control group, but on average, they present a lower synchronization value. These results could indicate that SMC are representing an initial stage with a hypo-synchronization (in comparison with the control group) where the brain system is still not compensating for the failing memory networks, but behaving as controls when compared with the MCI subjects.

Static Pressure Impact on Aerodynamics of High Speed Railway Tunnels

A pressure wave is generated when a high speed train enters a tunnel. This wave travels along the tunnel back and forth, and is reflected at the irregularities of the tunnel duct (section changes, chimneys and tunnel ends). The pressure changes are associated to these waves can have an effect on passengers if the trains are not suitably sealed or pressurized. The intensity of the waves depends mainly on the train speed, and on the blockage ratio (train-section-to- tunnel-section area ratio). As the intensity of the waves is limited by regulations, and also by the effects on passengers and infrastructures, the sizing of the tunnel section area is largely influenced by the maximum train speed allowed in the tunnel. The aim of this study is to analyse the increase in cost in a tunnel due to the existence of this difference in ground level, and evaluate the increase of construction costs that this elevation might involve.

Influential factors in determination of biomass termal susceptibility by termal analysis

Las biomasas almacenadas en silos son potencialmente capaces de absorber oxígeno produciendo reacciones exotérmicas de oxidación. Si el calor producido en estas reacciones no se dispersa adecuadamente, provoca un auto-calentamiento de la materia orgánica que puede ser causa de descomposición e inflamación. En el ámbito de la posible auto-combustión en el almacenamiento y manipulación de las biomasas existen diversos factores que influyen en la susceptibilidad térmica de las biomasas, es decir, en su tendencia a la oxidación y posterior inflamación de la materia. Con el fin de analizar este comportamiento se han estudiado diferentes tipos de biomasas. En este estudio se ha trabajado con biomasas de origen agrícola, forestal y residual con distinta composición química. Las muestras de estudio se han acondicionado mediante distintos tratamientos físicos para valorar la influencia de diferentes factores en su auto-combustión.

Application of protection means against explosions in underground mines

Underground coal mines explosions generally arise from the inflammation of a methane/air mixture. This explosion can also generate a subsequent coal dust explosion. Traditionally such explosions have being fought eliminating one or several of the factors needed by the explosion to take place. Although several preventive measures are taken to prevent explosions, other measures should be considered to reduce the effects or even to extinguish the flame front. Unlike other protection methods that remove one or two of the explosion triangle elements, namely; the ignition source, the oxidizing agent and the fuel, explosion barriers removes all of them: reduces the quantity of coal in suspension, cools the flame front and the steam generated by vaporization removes the oxygen present in the flame. The present paper is essentially based on the comprehensive state-of–the-art of Protective Systems in underground coal mines, and particularly on the application of Explosion Barriers to improve safety level in Spanish coal mining industry. After an exhaustive study of series EN 14591 standards covering explosion prevention and protection in underground mines, authors have proven explosion barriers effectiveness in underground galleries by Full Scale Tests performed in Polish Barbara experimental mine, showing that the barriers can reduce the effects of methane and/or flammable coal dust explosions to a satisfactory safety level.

Workflow-centric research objects: First class citizens in scholarly discourse.

A workflow-centric research object bundles a workflow, the provenance of the results obtained by its enactment, other digital objects that are relevant for the experiment (papers, datasets, etc.), and annotations that semantically describe all these objects. In this paper, we propose a model to specify workflow-centric research objects, and show how the model can be grounded using semantic technologies and existing vocabularies, in particular the Object Reuse and Exchange (ORE) model and the Annotation Ontology (AO).We describe the life-cycle of a research object, which resembles the life-cycle of a scienti?c experiment.

Alterations of cross-frequency coupling in MEG resting state recordings in Mild Cognitive Impairment patients

The default mode network (DMN) has received growing attention in recent years because it seems to be involved in the neuropathology of psychiatric and neurodegenerative disorders such as autism, schizophrenia and Alzheimer Disease. It has been defined as a task negative network, beca use the activity of all its brain regions is increased during the resting state and suspended during external or goal directed tasks.

Flammability properties of dry sewage sludges

Dry sewage sludge are being considered as a possible energy source for direct firing. They have interesting properties to be used as an alternative fuel, but also other characteristics must be considered from the point of view of its safe operation: the most important are ignition sensitivity, explosion severity, thermal sensitivity and thermal stability. The aim of this study was to determine if sewage sludge have different characteristics due to different locations or seasons and how this influences their flammability properties. To study these characteristics sludge samples were selected from different locations in Spain, taken during different seasons. In addition, relationships between flammability parameters and chemical analysis were observed. Some parameters can be controlled during normal operation, such as granulometry or humidity, and may mean a decrease in the risk of explosion. Those relationships are well known for other dusts materials, like coal, but not yet for sewage sludge dusts. Finally, properties related to spontaneous combustion were determined (thermal susceptibility and stability). The addition of those properties to the study provides an overview of the thermal behavior of sewage sludge during their utilization, including transport and storage.

Characterization of spontaneous combustuion tendency of dried sewage sludge

The general purpose of this study was the determination of the safety conditions to avoid the presence of explosive atmospheres in the wastewater industry. Eight Spanish plants located in Madrid, Barcelona and Málaga were considered and several sludge samples were taken in different seasons. The base for the assessment of the spontaneous ignition behaviour of dust accumulations is the experimental determination of the self-ignition temperature under isothermal conditions. Self-ignition temperatures at four volumes were obtained for one sample of sewage sludge, allowing their extrapolation to large storage facilities. A simple test method, based also on an isothermal study of samples, is the UN classification of substances liable to spontaneous combustion. Two different samples were so tested, obtaining unlike results if transported in packages of different volumes. By means of thermogravimetric techniques it is possible to analyse the thermal susceptibility of dried sewage sludge. Apparent activation energy can be obtained from the rate of weight loss. It is also applied to the study of self-ignition susceptibility by modifying test conditions when oxygen stream is introduced. As a consequence of this oxidant contribution, sample behaviour can be very different during testing and a step drop or sudden loss of weight is observed at a characteristic temperature for every substance, associated to a rapid combustion. Plotting both the activation energy and the characteristic temperature, a map of self-ignition risk was obtained for 10 samples, showing different risk levels for samples taken in different locations and at different seasons. A prediction of the self-ignition risk level can be also determined.

Apologia contra los Diarios de los Literatos de España : sobre los articulos XII. XIII y XIV del Tomo II y I del Tomo III

Contiene: Repulsa evidente de una impostura, y censura calumniosa : XL p.

Prácticas en Asturias Manuscrito : grupos hulleros de las minas Mariana, Baltasara, Zurón : fábrica de luz eléctrica en Gijón : transporte de energía eléctrica en el puerto del Musel (Gijón)

Asturias es una del as regiones mineras más importante de nuestra Península.Además de figurar en primer término como proveedora de hulla, contiene también otras minas de sustancias metalíferas, entre las que pueden citarse las del Naranco (Oviedo)....

Determinación del riesgo de auto-combustión en almacenamiento de biomasas para la producción de gas mediante gasificación

En la actualidad más del 80 % de la energía eléctrica empleada en el mundo se obtiene a partir de combustibles de origen fósil. Sin embargo, estas fuentes de energía (gas natural, el carbón o el petróleo) presentan problemas de emisión de cantidades importantes de contaminantes a la atmósfera como CO, NOx y SOx. Estas emisiones están llevando a intentar reducir las emisiones enfocando el consumo a la utilización de fuentes de energía renovable, menos dañinas para el ambiente como la energía solar, la eólica, la biomasa, etc. En los almacenamientos de biomasa, ésta es potencialmente capaz de absorber oxígeno produciendo reacciones exotérmicas de oxidación. Si el calor producido en estas reacciones no se disipa adecuadamente, provoca un auto-calentamiento de la materia orgánica que puede ser causa de descomposición e inflamación. En el ámbito de la posible auto-combustión en el almacenamiento y manipulación de las biomasas existen diversos factores que influyen en la susceptibilidad térmica de las biomasas, es decir, en su tendencia a la oxidación y posterior inflamación de la materia. Esta Tesis Doctoral pretende evaluar el riesgo de auto-combustión de las biomasas almacenadas, para su uso en procesos de gasificación. En este estudio se ha trabajado con biomasas de origen agrícola, forestal y residual empleadas en procesos industriales de gasificación con distinta composición química. Los métodos empleados se han basado en técnicas clásicas de termogravimetría, calorimetría diferencial de barrido, análisis de composición y morfología. Con estos ensayos se pretende definir un rango de temperaturas lo más estrecho posible donde las muestras presentan mayor susceptibilidad a un calentamiento espontáneo que puede derivar en auto-combustión, en función de las distintas propiedades estudiadas de las biomasas, para poder servir así de herramienta de evaluación y análisis del riesgo de autocombustión. Como conclusión se muestran umbrales y valores que relacionan las propiedades físicas y químicas de las biomasas estudiadas en su auto-combustión, analizando la influencia de los procesos de preparación de las biomasas sobre las variables que caracterizan su susceptibilidad térmica.

Cartas eruditas, y curiosas [Texto impreso] : En que ... se continúa el designio del Theatro critico universal, Impugnando, ò reduciendo à dudosas, varias opiniones comunes

Contiene con port. propia (p. 327-340) : Conversion de un pecador / por Don Geronymo Montenegro, su verdadero autor ..