Os dejo hoy un resumen de la Primera Unidad del Curso de Facilitación de Comunidades Online en el que participo, considerando que puede ser de utilidad a diversas disciplinas, desde la educación al márketing social.
El curso se desarrolla en inglés (paso a traducir este mismo artículo) pero he creído que a algunos lectores podrían seros de interés algunas de sus conclusiones. Lo iré haciendo al finalizar cada unidad. Se trata de un ejercicio de síntesis y aportación personal. Podéis ver las fuentes teóricas de las que parto, las que matizo según mi experiencia, al final del artículo
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Al2O3 crystals (Sapphire), featuring broad optical transmission from 150-5500nm spanning from UV to MWIR spectrum, and robust mechanical/thermal properties, are excellent for applications involving harsh and variant environments or requiring a broad transparent wavelength range (e.g. windows of sensors and detectors, IR applications, etc.). The material's most distinguishing attribute is its unequaled mechanical strength, being the second hardest material after diamond, single sapphire crystals have a Knoop Hardness of 1800-2200, making the windows made from single crystals sapphire resistant in extreme to chemical corrosion and abrasions. Sapphire windows might be produced into thin optics without fracturing because of the tight internal covalent bonding of single-crystal sapphire while demonstrating good thermal stabilities due to its high thermal conduction.
Sappire (as known as white sappire, molecular formula Al2O3) single crystal is an excellent multifunctional material. It has high temperature resistance, good thermal conductivity, high hardness, infrared transmission and good chemical stability. It is widely used in many fields of industry, national defense and scientific research (such as high-temperature infrared windows, etc.). At the same time, it is also a widely used single crystal substrate material, and it is the first choice for the blue, violet, and white light emitting diode (LED) and blue laser (LD) industries. And it is also an important superconducting film substrate. In addition to making Y-series, La-series and other high-temperature superconducting films, it can also be used to grow new practical MgB2 superconducting films.
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