Thermoluminescence is a form of luminescence that is exhibited by certain crystalline materials, such as some minerals, when previously absorbed energy from electromagnetic radiation or other ionizing radiation is re-emitted as light upon heating of the material. The phenomenon is distinct from that of black body radiation.
Incandescence is the emission of light (visible electromagnetic radiation) from a hot body due to its temperature. The term derives from the verb incandesce, to glow white.
Tuesday, June 29, 2010
Monday, June 7, 2010
Yeats - First poem in (1936) Oxford book of modern verse (on the Mona Lisa / La Gioconda)
She is older than the rocks among which she sits;
Like the Vampire,
She has been dead many times,
And learned the secrets of the grave;
And has been a diver in deep seas,
And keeps her fallen day about her;
And trafficked for strange webs with Eastern merchants;
And, as Leda,
Was the mother of Helen of Troy,
And, as St. Anne,
Was the mother of Mary;
And all this has been to her but as the sound of lyres and flutes,
And lives
Only in the delicacy
With which it has moulded the changing lineaments,
And tinged the eyelids and the hands.
Like the Vampire,
She has been dead many times,
And learned the secrets of the grave;
And has been a diver in deep seas,
And keeps her fallen day about her;
And trafficked for strange webs with Eastern merchants;
And, as Leda,
Was the mother of Helen of Troy,
And, as St. Anne,
Was the mother of Mary;
And all this has been to her but as the sound of lyres and flutes,
And lives
Only in the delicacy
With which it has moulded the changing lineaments,
And tinged the eyelids and the hands.
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