Search results
Results From The WOW.Com Content Network
Moon blocks or jiaobei (also written as jiao bei etc. variants; Chinese: 筊杯 or 珓杯; pinyin: jiǎo bēi; Jyutping: gaau2 bui1), also poe (from Chinese: 桮; Pe̍h-ōe-jī: poe; as used in the term "poe divination"), are wooden divination tools originating from China, which are used in pairs and thrown to seek divine guidance in the form of a yes or no question.
Thermoluminescence from heating chlorophane specimens on a hotplate. Triboluminescence from rubbing together two quartz crystals.. First, it will be useful to introduce some mineralogical terminology for gemstones that can glow when exposed to light, friction, or heat.
The heating process causes gases trapped in the clay to expand, forming thousands of small bubbles and giving the material a porous structure. LECA has an approximately round or oblong shape due to circular movement in the kiln and is available in different sizes and densities. LECA is used to make lightweight concrete products and other uses.
A compressed earth block (CEB), also known as a pressed earth block or a compressed soil block, is a building material made primarily from an appropriate mix of fairly dry inorganic subsoil, non-expansive clay, sand, and aggregate. Forming compressed earth blocks requires dampening, mechanically pressing at high pressure, and then drying the ...
Phosphorescent materials were discovered in the 1700s, and people have been studying them and making improvements over the centuries.The development of strontium aluminate pigments in 1993 was spurred on by the need to find a substitute for glow-in-the-dark materials with high luminance and long phosphorescence, especially those that used promethium.
The stone blocks saw little popularity until 1880, when Friedrich Adolf Richter, a wealthy businessman who had built a small empire in Rudolstadt, purchased the rights to the process for 1,000 marks, plus about 4800 marks (including 800 marks still owing) for the tooling and machines being used to produce them. He developed a series of sets of ...
The term talatat was apparently used by the contemporary Egyptian workmen and introduced into the language of archaeology by the Egyptologist H. Chevrier. There are two hypotheses as to the word's generally unknown ultimate origin in reference to the stones, perhaps not contradictory: [7] The word may be derived from Italian tagliata, meaning cut masonry, [8] or may be derived from the ...
Blocks are formed from material from previous eruptions or from country rock and are therefore mostly accessory or accidental in origin. Blocks also occur due to the impact and breakage of volcanic bombs (a bomb is a block with streamlined appearance, often expelled in a molten state). Blocks can also occur due to the disruption of the crust of ...