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3.895  Articles
1 of 391 pages  |  10  records  |  more records»
The processes of a selective epitaxy of silicon layers on the structures Si-SiO2-Si*, formation of dielectric isolation and diffusive areas of complementary bipolar transistor structures are optimized in the work. Complete dielectric isolation of elements... see more

The cutoff frequency performance of an NPN Si/SiGe/SiGe single-heterojunction bipolartransistor (SiGe SHBT) at high collector current densities has been analysed using a 2-D MEDICIdevice simulator. A conventional NPN Si/SiGe/Si double-heterojunction bipol... see more

ResumenEl mundo actual vive constantes avances en materia tecnológica, adquisición y actualización de la información; por lo cual se evidencia la necesidad de adquirir nuevos conocimientos. La educación actual procura hallar a través de los medios tecnoló... see more

ResumenEl mundo actual vive constantes avances en materia tecnológica, adquisición y actualización de la información; por lo cual se evidencia la necesidad de adquirir nuevos conocimientos. La educación actual procura hallar a través de los medios tecnoló... see more

This paper presents the development of a two-stage low noise amplifier (LNA) operating at the S-band frequency that is implemented using the non-simultaneous conjugate match (NSCM) technique. The motivation of this work was to solve the issue of the gain ... see more

Demencia frontotemporal y manía: estudio de un caso y revisión de la literaturaDemencia frontotemporal y manía: estudio de un caso y revisión de la literaturaINTRODUCTION: Frontotemporal Dementia is a descriptive term used to define a dementia invariably associated with degeneration of the frontal and temporal lobes, in the absence of Alzheimer's disease. It is a heterogeneous group of neurodegenerative diseases with different clinical manifestations, genetic component and anatomopathological alteration. It´s psychiatric symptoms have an insidious onset, with personality deterioration and progressive affectation of behavior. Usually these changes occur before finding abnormalities in neuroimaging studies, their characteristics depend on the location of the cerebral lesions and usually are precede or mask by cognitive disabilities. Apathy and lack of volition are common initial symptoms and occurs in most patients as the disease progresses. Disinhibition is manifested by inappropriate social behaviors such as inadequate laughter, exhibitionism, restless, impulses, uncontrolled sexuality and violence, inappropriate jocularity and childish humor; that symptoms can be present in a half of patients.CASE REPORT: A representative case report was considered in which the first manifestation of dementia is a syndrome with manic features. Also, specific literature published to date is reviewed.CONCLUSIONS: Is required a correct differential diagnosis between dementia and the beginning of a late onset bipolar affective disorder, and complementary examinations can be useful for this purpose.

CONCLUSIONS: Is required a correct differential diagnosis between dementia and the beginning of a late onset bipolar affective disorder, and complementary examinations can be useful for this purpose.

La complejidad creciente de los sistemas electrónicos, el escalado de las dimensiones con nuevos nodos tecnológicos y el incremento de las frecuencias de trabajo, demandan circuitos integrados cada vez más exactos y estables. Para lograrlos se requiere de... see more

Se realiza un estudio teórico de la zona de ruptura por avalancha de los Transistores Bipolares y la caracterización de los mismos en dichas condiciones extremas de trabajo, para obtener los datos necesarios y de esta manera un criterio de selección, que ... see more

Teaching abstract subjects to students studying towards a degree in electronics practical engineering (a degree between a technician and an engineer) requires didactic tools that enable understanding of issues without using advanced mathematics and physic... see more

1 of 391 pages  |  10  records  |  more records»