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Pedro J. Hdez
Attended University of Manchester
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Pedro J. Hdez

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5 buenas razones por la que podemos confiar en los modelos climáticos

1, Por una cuestión de simple ciencia http://arstechnica.com/science/2013/09/why-trust-climate-models-its-a-matter-of-simple-science/

2, Porque muestran un gran acuerdo con el aumento de temperaturas de superficie http://www.skepticalscience.com/Climate-Models-Show-Remarkable-Agreement-with-Recent-Surface-Warming.html

3. Porque llevan décadas haciendo predicciones correctas http://tamino.wordpress.com/2014/03/21/hansens-1988-predictions/

4. Porque podemos jugar personalmente con modelos climáticos de todo tipo http://www.easterbrook.ca/steve/2013/01/simple-climate-models-to-play-with-in-the-classroom/

5. Porque su implementación es completamente transparente http://www.easterbrook.ca/steve/2013/01/new-grad-course-on-computational-models-of-climate-change/
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How climate scientists test, test again, and use their simulation tools.
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Pedro J. Hdez

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Popular Mechanics se hace eco de los denominados editores rapaces que utilizan las publicaciones on-line abiertas para ganar dinero a base de donaciones y titulares atractivos basados en mala ciencia. Me hice eco de estas prácticas en un artículo en Naukas hace unos meses

http://naukas.com/2013/04/20/un-estudio-vergonzoso-sobre-la-radiacion-de-fukushima/

Los autores que criticaba en aquél artículo han vuelto a ser puestos en evidencia con otro estudio basura donde relacionaban un exceso de 4000 cánceres en la población tras el cierre de la central nuclear de Rancho Seco (California) en 1989.

La nota de prensa del departamento de salud pública http://www.slocounty.ca.gov/Assets/PH/Media+Release+-+DCNPP+Health+Study.pdf

Estudio http://www.slocounty.ca.gov/Assets/PH/Health+Concerns+from+DCNPP.pdf
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Pedro J. Hdez

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[*] Not all CO2 emissions are accumulating in the atmosphere – only about 45% of our emissions end up in the atmosphere.

[*] For each ppm increase of CO2 concentration the atmosphere must absorb 2.12 GtC.

[*] The relationship between atmospheric CO2 concentration and the corresponding increase in radiative forcing is given by the logarithmic formula: RF = 5.35·ln (C/C0), where RF denotes radiative forcing in W/m2, C is CO2 concentration in parts per million (ppm), C0 is a reference concentration (usually the latter is 280 ppm – the concentration before the industrial revolution).

[*] Doubling the CO2 concentration (which is equivalent to 3.7 W/m2 increase in radiative forcing) causes temperature increase of 3°C.
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Pedro J. Hdez

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Silicon cells require direct sunlight (rays must shine at at least 90 degrees) before they start outputting energy. But newer technologies like OPV generate energy regardless of the angle of the rays. On a cloudy day, though there is less sunlight overall, rays still hit the earth at multiple angles. Thus, OPV cells can produce energy for a larger portion of the day.

The efficiency of this technology has already climbed rapidly in recent years, from 5 percent in 2008 to 12 percent in 2013. Conventional solar panels average about 15 percent efficiency, with the best commercial products coming in at around 20 percent.
Scientists have already developed technologies that are more effective in cloudy weather. Now they just have to prove it.
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Have him in circles
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Pedro J. Hdez

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Hoy en el blog de música una lista de reproducción con excelentes ejecuciones en directo de piezas de Arvo Pärt que hará las delicias de aquellos seguidores de este compositor y además servirá como una magnífica introducción a aquellos que no conozcan su obra.
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Hoy presentamos una grabación de la Estonian Philharmonic Chamber Choir and Tallinn Chamber Orchestra bajo la dirección de Tõnu Kaljuste en la iglesia de San Nicolás, Tallinn, Estonia en agosto de 1999 de una pieza del gran compositor Arvo Pärt que podría ser perfectamente representativa de la música cristiana antigua. Te Deum dura unos 30 minutos y encaja perfectamente dentro de nuestra selección musical por Semana Santa. Pero antes queremos pre...
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One day when I was still very young, I asked my father about his parents. I knew my maternal grandparents intimately, but I wanted to know why I had never met his parents.

“Because they died,” he said wistfully.

“Will you ever see them again?” I asked.

He considered his answer carefully. Finally, he said that there was nothing he would like more in the world than to see his mother and father again, but that he had no reason — and no evidence — to support the idea of an afterlife, so he couldn’t give in to the temptation.

“Why?”

Then he told me, very tenderly, that it can be dangerous to believe things just because you want them to be true. You can get tricked if you don’t question yourself and others, especially people in a position of authority. He told me that anything that’s truly real can stand up to scrutiny.

As far as I can remember, this is the first time I began to understand the permanence of death. As I veered into a kind of mini existential crisis, my parents comforted me without deviating from their scientific worldview.
Learning about mortality and immortality from my father, Carl Sagan. 
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Comparación de tamaños de naves y vehículos de la historia de la exploración espacial.

Vía http://www.wired.com/2014/04/historic-spacecraft/
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Pedro J. Hdez

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Todo es relativo. Algunos afirman haber visto esta mañana un eclipse solar :)
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Lunar Eclipse (as if you're on the Moon)

In the early morning hours on April 15, 2014, the Moon entered the Earth's shadow, creating a total lunar eclipse. When viewed from the Moon, as in this frame from a computer-generated animation created by NASA Goddard's Scientific Visualization Studio, the Earth hides the Sun. A red ring, the sum of all Earth's sunrises and sunsets, lines the Earth's limb and casts a red glow on the lunar landscape. With the darkness of the eclipse, the stars emerge in the background. Notice how the city lights of North and South America are visible on the night side of the Earth. The lunar eclipse was visible in those two continents.

Watch the full animation at
https://www.flickr.com/photos/gsfc/13853309795/

Read more about the eclipse on the Lunar Reconnaissance Orbiter website at http://www.nasa.gov/mission_pages/LRO/main/#.U02vGiQZMTE

See more Earth at Night imagery at
http://earthobservatory.nasa.gov/Features/NightLights/?src=googleplus
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Los nipones hicieron un timelapse desde La Luna en un eclipse de 2009 con su nave orbital Kaguya http://space.jaxa.jp/movie/20090218_kaguya_movie01_j.html

Vía http://www.universetoday.com/25929/kaguya-captures-eclipse-from-the-moon/
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El perro de Pavlov :)
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Have him in circles
895 people
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Profesor de tecnología en Secundaria
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Nunca atribuyo a una conspiración aquello que pueda explicarse por simple incompetencia
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Colaborador de naukas.com
Education
  • University of Manchester
    MSc, 1992 - 1993
  • ULL
    Física/Astrofísica, 1986 - 1991
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