Tags » Ultraviolet Light

Hubble Ultra-Deep Field

The 2014 edition of the Hubble Ultra-Deep Field, a composite image of separate exposures taken from 2003 to 2012 with the Hubble Space Telescope… 38 more words



We fair-haired or fair-skinned folks have learned to be cautious in our dealings with outdoor activities.  The Sun is both our friend and our foe.  We learned, sometimes the physically painful way, to protect ourselves from solar radiation. 530 more words


HVAC Coils — Keeping Them Clean

Keeping condensing and cooling coils clean increases their efficiency by 15%-30% depending on what research paper you read. The problem with most of these coils is they are difficult to get at or inside the AHU and require shutting the system down — which may not be a viable option. 745 more words

HVAC Articles

Heliogravure III - Ultraviolet Light with Digital Screen

Updated 26/01/2016

Hardening the gelatin. In heliogravure, it is necessary an illumination source rich in ultraviolet (UV) light. This UV light must provoke the cross link reaction into the gelatin previously sensitized with potassium bichromate (K2Cr2O7). 1,467 more words

Early Photography

How Far is the Other Side?

There is far too much evidence to deny the existence of some sort of continuance of life beyond what we call death. Just what that existence consists of is conjecture; but the energy that we are made up of just doesn’t disappear when we leave our bodies. 305 more words