Contribución a la caracterización químico-mineralógica de los esquistos del "Complejo de Ordes"

[Resumen] Se presentan los datos qUlmlcos y mineralógicos de 77 muestras de rocas esquistosas de la "Unidad Betanzos-Arzúa", perteneciente al "Complejo de Ordes" , con objeto de analizar la variabilidad existente y discutir las posibilidades de sectorización de los distintos tipos de rocas en función de parámetros de composición.[Abstract] This paper presents the chemical and mineralogical composi tion of 77 samples of schi ts belonging to the "Unit of Betanzos-Arzua" , included in the "Ordenes Complex" . Tqe data were used to make an analysis the variability in the composi tion of the rocks and a subdivision of the " Unidad " based on the rock characteristics was intented

Robust symmetric multiplication for programmable analog VLSI array processing

This paper presents an electrically programmable analog multiplier. The circuit performs the multiplication between an input variable and an electrically selectable scaling factor. The multiplier is divided in several blocks: a linearized transconductor, binary weighted current mirrors and a differential to single-ended current adder. This paper shows the advantages introduced using a linearized OTA-based multiplier. The circuit presented renders higher linearity and symmetry in the output current than a previously reported single-transistor multiplier. Its inclusion in an array processor based on CNN allows for a more accurate implementation of the processing model and a more robust weight distribution scheme than those found in previous designs.Office of Naval Research (USA) N-00014- 02-1-0884Ministerio de Ciencia y Tecnología TIC2003-09817-C02-0

Cierre quirúrgico en flexión versus extensión en artroplastias totales de rodilla

Se ha realizado un estudio prospectivo de 44 pacientes con gonartrosis primaria que fueron intervenidos con artroplastia total de rodilla con el objeto de determinar las diferencies en cuanto a la movilidad final de la rodilla dependiendo del cierre quirúrgico en flexión o en extensión. Se formaron dos grupos con similares características de homogeneidad respecto al sexo, edad, peso corporal y arco de movilidad previa, no existiendo diferencies significativas entre los grupos en la valoración preoperatoria. En el primer grupo se incluyeron 22 pacientes donde se había realizado la sutura de la cápsula articular y del plano muscular y cutáneo en flexión de 70º a 90º; el segundo grupo estaba formado por otros 22 pacientes en los que se realizó la sutura con la rodilla en extensión completa. En todos los pacientes se implantó el mismo modelo artroplástico y todos siguieron el mismo protocolo de rehabilitación postoperatoria. La evaluación clínica se realizó en el momento del alta hospitalaria, al mes, tres y seis meses, siguiendo la escala del Hospital for Special Surgery. Se apreció un arco de movilidad y puntuación clínica mayor en el grupo de rodillas suturadas en extensión, con una diferencia estadísticamente significativa, en los controles realizados en el alta hospitalaria y al mes de la intervención. A los seis meses no se apreciaron diferencias entre ambos grupos. La posición de la rodilla en el cierre quirúrgico de una artroplastia no afecta a su funcionalidad.In a prospective study, 44 patients with primary osteoarthritis of the knee undergoing total knee arthroplasty were compared to determine whether surgical closure of the entire wound in flexion had any effect on the postoperative range of motion over a period of six months. In twenty-two patients the knee was surgically closed in 70º to 90º flexion. In the second group of 22 patients, knees were closed in extension. There was no significant difference between groups respect to age, gender, weight and preoperative range of motion. All of the patients were operated on by the same team of surgeons and with the same type of prosthesis. Both groups of patients received a standardized exercise program during their hospitalization. All patients were evaluated following the parameters of the Hospital for Special Surgery score at discharge from the hospital, at first month, third and sixth month after operation. At all the intervals, both the flexion measurements and function scores were better in the flexion closure group, although we only found statically significant difference at discharge and at the first month postoperatively. The position of the knee in the surgical closing of an arthroplasty doesn't affected o functionality

A Focal-Plane Image Processor for Low Power Adaptive Capture and Analysis of the Visual Stimulus

Portable applications of artificial vision are limited by the fact that conventional processing schemes fail to meet the specifications under a tight power budget. A bio-inspired approach, based in the goal-directed organization of sensory organs found in nature, has been employed to implement a focal-plane image processor for low power vision applications. The prototype contains a multi-layered CNN structure concurrent with 32times32 photosensors with locally programmable integration time for adaptive image capture with on-chip local and global adaptation mechanisms. A more robust and linear multiplier block has been employed to reduce irregular analog wave propagation ought to asymmetric synapses. The predicted computing power per power consumption, 142MOPS/mW, is orders of magnitude above what rendered by conventional architectures

Alteración de las rocas gneisicas con riebeckita del área de Vigo

[Resumen] Se estudian los factores del medio físico, procesos de alteración y cambios químicos y mineralógicos producidos en la meteorización de un grupo de rocas gneisicas de composiciónquímica heterogénea en el área de Vigo. El proceso de alteración origina una saprolita masivade textura arenosa a areno-francosa, constituida por minerales heredados (cuarzo, feldespatos, plagioclasas, micas y anfíboles), micas degradadas y minerales neoformados (caolinita, gibbsita , goethita). El proceso de meteorización es una hidrólisis ácida con pérdida de bases y silicio y enriquecimiento relativo en aluminio. Los minerales de neoformación indican un predominio de la "monosialitización" cuando el sistema presenta drenaje ralentizado y de la "alitización")en fases incipientes de la alteración}cuando el sistema no tiene materia orgánica y el drenaje es excesivo[Abstract] It has been studied the physical environmental factors, alteration processes, and chemical and mineralogical changes produced during the gneisic rocks group from Vigo area ~eathering. ln these rocks great heterogenity in the chemical composition has been found. The weathering prevailing process in the area give rise to the formation of a saprolite with sandy to sandy-loamy textures,increasing permeability and it is composed of inherited minerals :quarz, feldspars and/or plagioclases,micas, amphiboles; neoformed materials, gibbsite,caolinite,goethite and degraded micas)the last two occasionally. The weathering process is an acid hydrolysis with desbasification and Al relative enrichment tendencies. With slow drainage systems the neoformed minerals indicate a monosiallitization predominance (formation of silicates 1:1); while 1ack i ng organ i c matter and in good dra i ned zones, the neoformed minerals indicate an incipient allititatio

Review of ADCs for imaging

The aim of this article is to guide image sensors designers to optimize the analog-to-digital conversion of pixel outputs. The most common ADCs topologies for image sensors are presented and discussed. The ADCs specific requirements for these sensors are analyzed and quantified. Finally, we present relevant recent contributions of specific ADCs for image sensors and we compare them using a novel FOM. © (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use onlyPeer reviewe