Design and construction of a portable spectrum analyzer using a graphic LCD and a freescale dsp56f807

 En el presente artículo se hallan contenido los resultados de la investigación realizada para el diseño y construcción de un equipo analizador de espectros portátil utilizando el procesador de señales digitales DSP56F807 miembro de la familia 56F800 de Freescale Semiconductor y una pantalla LCD gráfica. Se resalta este diseño como un ejemplo de aplicación directa de la teoría de tratamiento digital de señales y, se observa finalmente que los errores obtenidos son menores al 1% al implementar el algoritmo de radix-2 para calcular la Transformada Rápida de  fourier con diversas formas de onda.This article presents the results of the investigation carried out for the design and construction of a portable spectrum analyzer using the digital signal processor DSP56F807, a member of the family 56F800 of Freescale Semiconductor, and a screen LCD graph. This design is an example of a direct application of the theory of digital signal processing. It was finally observed that the obtained erros are smaller than 1% when implementing the radix-2 algorithm to calculate the fast fourier transform with different waveforms

Resultados Semilleros de Investigación 2009-2010

La publicación recoge los doce informes finales de investigación presentados por los estudiantes de ocho Semilleros 1 y cuatro Semilleros 2, correspondientes a la convocatoria 2009–2010 y se constituye en el Número 25 de la Serie de Investigaciones en Construcción, si bien este es el primer Número publicado en formato digital que UNIJUS se permite poner a disposición no sólo de la comunidad universitaria, sino también de la sociedad colombiana e internacional, interesada en los temas estudiados por los jóvenes investigadores de la Facultad de Derecho, Ciencias Políticas y Sociales de la Universidad Nacional de Colombia

Design and construction of a portable spectrum analyzer using a graphic LCD and a freescale dsp56f807

 En el presente artículo se hallan contenido los resultados de la investigación realizada para el diseño y construcción de un equipo analizador de espectros portátil utilizando el procesador de señales digitales DSP56F807 miembro de la familia 56F800 de Freescale Semiconductor y una pantalla LCD gráfica. Se resalta este diseño como un ejemplo de aplicación directa de la teoría de tratamiento digital de señales y, se observa finalmente que los errores obtenidos son menores al 1% al implementar el algoritmo de radix-2 para calcular la Transformada Rápida de  fourier con diversas formas de onda.This article presents the results of the investigation carried out for the design and construction of a portable spectrum analyzer using the digital signal processor DSP56F807, a member of the family 56F800 of Freescale Semiconductor, and a screen LCD graph. This design is an example of a direct application of the theory of digital signal processing. It was finally observed that the obtained erros are smaller than 1% when implementing the radix-2 algorithm to calculate the fast fourier transform with different waveforms

I simposio Internacional sobre Investigación en la enseñanza de las ciencias

Edición 202

Erratum to: Guidelines for the use and interpretation of assays for monitoring autophagy (3rd edition) (Autophagy, 12, 1, 1-222, 10.1080/15548627.2015.1100356

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Diminishing benefits of urban living for children and adolescents’ growth and development

Optimal growth and development in childhood and adolescence is crucial for lifelong health and well-being1–6. Here we used data from 2,325 population-based studies, with measurements of height and weight from 71 million participants, to report the height and body-mass index (BMI) of children and adolescents aged 5–19 years on the basis of rural and urban place of residence in 200 countries and territories from 1990 to 2020. In 1990, children and adolescents residing in cities were taller than their rural counterparts in all but a few high-income countries. By 2020, the urban height advantage became smaller in most countries, and in many high-income western countries it reversed into a small urban-based disadvantage. The exception was for boys in most countries in sub-Saharan Africa and in some countries in Oceania, south Asia and the region of central Asia, Middle East and north Africa. In these countries, successive cohorts of boys from rural places either did not gain height or possibly became shorter, and hence fell further behind their urban peers. The difference between the age-standardized mean BMI of children in urban and rural areas was <1.1 kg m–2 in the vast majority of countries. Within this small range, BMI increased slightly more in cities than in rural areas, except in south Asia, sub-Saharan Africa and some countries in central and eastern Europe. Our results show that in much of the world, the growth and developmental advantages of living in cities have diminished in the twenty-first century, whereas in much of sub-Saharan Africa they have amplified