A Triple-Mode Feed-Forward Sigma-Delta Modulator Design For Gsm / Wcdma / Wlan Applications

This paper presents a cascaded 2-2-2 reconfigurable sigma-delta modulator that can handle GSM, WCDMA and WLAN standards. The modulator makes use of a low-distortion swing suppression topology which is highly suitable for wide band applications. In GSM mode, only the first stage (2nd order Σ-Δ ADC) is turned on to achieve 88dB dynamic range with oversampling ratio of 160 for a bandwidth of 200KHz; in WCDMA mode a 2-2 cascaded structure (4th order) is turned on with 1-bit in the first stage and 2-bit in the second stage to achieve 74 dB dynamic range with oversampling ratio of 16 for a bandwidth of 2MHz and a 2-2-2 cascaded MASH architecture with a 4-bit in the last stage to achieve a dynamic range of 58dB for a bandwidth of 20MHz. The novelty lies in the fact that unused blocks of second and third stages can be switched off taking into considerations like power consumption. The modulator is designed in TSMC 0.18um CMOS technology and operates at 1.8 supply voltage.

A study on the quality of life of the members of self help groups assisted by non-governmental organisations in Kerala

School of Management Studies, CUSAT

Self-Assembly of Stimuli-Responsive Water-Soluble [60]Fullerene End-Capped Ampholytic Block Copolymer

Well-defined, water-soluble, pH and temperature stimuli-responsive [60]fullerene (C₆₀) containing ampholytic block copolymer of poly((methacrylic acid)-block-(2-(dimethylamino)ethyl methacrylate))-block–C₆₀ (P(MAA-b-DMAEMA)-b-C₆₀) was synthesized by the atom transfer radical polymerization (ATRP) technique. The self-assembly behaviour of the C₆₀ containing polyampholyte in aqueous solution was characterized by dynamic light scattering (DLS), and transmission electron microscopy. This amphiphilic mono-C₆₀ end-capped block copolymer shows enhanced solubility in aqueous medium at room and elevated temperatures and at low and high pH but phase-separates at intermediate pH of between 5.4 and 8.8. The self assembly of the copolymer is different from that of P(MAA-b-DMAEMA). Examination of the association behavior using DLS revealed the co-existence of unimers and aggregates at low pH at all temperatures studied, with the association being driven by the balance of hydrophobic and electrostatic interactions. Unimers and aggregates of different microstructures are also observed at high pH and at temperatures below the lower critical solution temperature (LCST) of PDMAEMA. At high pH and at temperatures above the LCST of PDMAEMA, the formation of micelles and aggregates co-existing in solution is driven by the combination of hydrophobic, electrostatic, and charge-transfer interactions.

Implementation of training programs in self-regulated learning strategies in Moodle format : Results of a experience in higher education

Resumen tomado de la publicaci??n

Gestión de la actividad no presencial y autoevaluación de competencias = Management of student learning outside the classroom and the self-evaluation of competences

La asignatura troncal “Evaluación Psicológica” de los estudios de Psicología y del estudio de grado “Desarrollo humano en la sociedad de la información” de la Universidad de Girona consta de 12 créditos según la Ley Orgánica de Universidades. Hasta el año académico 2004-05 el trabajo no presencial del alumno consistía en la realización de una evaluación psicológica que se entregaba por escrito a final de curso y de la cual el estudiante obtenía una calificación y revisión si se solicitaba. En el camino hacia el Espacio Europeo de Educación Superior, esta asignatura consta de 9 créditos que equivalen a un total de 255 horas de trabajo presencial y no presencial del estudiante. En los años académicos 2005-06 y 2006-07 se ha creado una guía de trabajo para la gestión de la actividad no presencial con el objetivo de alcanzar aprendizajes a nivel de aplicación y solución de problemas/pensamiento crítico (Bloom, 1975) siguiendo las recomendaciones de la Agencia para la Calidad del Sistema Universitario de Cataluña (2005). La guía incorpora: los objetivos de aprendizaje, los criterios de evaluación, la descripción de las actividades, el cronograma semanal de trabajos para todo el curso, la especificación de las tutorías programadas para la revisión de los diversos pasos del proceso de evaluación psicológica y el uso del foro para el conocimiento, análisis y crítica constructiva de las evaluaciones realizadas por los compañeros

This is funny : On the beneficial role of self-enhancing and affiliative humour in job design

Resumen tomado de la publicaci??n

Self-injurious behavior in Portuguese adolescents

Resumen tomado de la publicaci??n

Evaluación de la severidad de la ideación suicida autoinformada en escolares de 8 a 12 año = Assessment of self-report suicidal ideation severity in 8 to 12 years old school children

El objetivo de este estudio es la evaluación de la ideación suicida infantil y su severidad a partir de la información proporcionada por el propio niño. Para ello se ha aplicado el Children’s Depression Inventory a una muestra representativa de 361 escolares de edades comprendidas entre los 8 y 12 años. Un mes más tarde se ha verificado la persistencia de los deseos de morir mediante la Children’s Depression Rating Scale-Revised. Se evalúa la severidad de la ideación suicida autoinformada con relación a la persistencia, la alteración del estado de ánimo y el conocimiento intelectual de la muerte. Los resultados indican que la persistencia de la intencionalidad suicida esta asociada a una mayor sintomatología depresiva

Self-concept, self-esteem and psychopathological symptoms. 'Autoconcepto, autoestima y s??ntomas psicopatol??gicos'

Resumen tomado de la publicaci??n

Self-regulated profiles and academic achievement. 'Perfiles de aprendizaje autorregulado y rendimiento acad??mico'

Resumen tomado de la publicaci??n

Modelos de autoconcepto y rendimiento : el 'Self Description Questionnaire I'

Resumen tomado de la publicaci??n

Validity of the self-report on drug use by university studentes : correspondence between self-reported use and use detected in urine

Resumen tomado de la publicaci??n

Automatic self-configuration of the logical network using distributed software agents

We present a system for dynamic network resource configuration in environments with bandwidth reservation. The proposed system is completely distributed and automates the mechanisms for adapting the logical network to the offered load. The system is able to manage dynamically a logical network such as a virtual path network in ATM or a label switched path network in MPLS or GMPLS. The system design and implementation is based on a multi-agent system (MAS) which make the decisions of when and how to change a logical path. Despite the lack of a centralised global network view, results show that MAS manages the network resources effectively, reducing the connection blocking probability and, therefore, achieving better utilisation of network resources. We also include details of its architecture and implementation

Assessing self-regulated learning in early childhood education : Difficulties, needs, and prospects

Resumen tomado de la publicaci??n

Critical thinking as a self-regulatory process component in teaching and learning

Resumen tomado de la publicaci??n