Materjalimaailm

Vaata kõiki materjalimaailma artikleid siit või kõige viimast altpoolt:

-
Text and photos: Jaak Kikas, UT Institute of Physics, Tartu
Translation: Liis
  
He who remembers old grudges loses an eye, an Estonian proverb says. The cure for injuries is not to remember them is an Italian saying. But to remember is also essential and useful for humans. It is not for nothing that the storage of information, and materials and methods for it, have played a major role in our technological development, from the clay tablets of Mesopotamia to today’s DVDs and memory cards. The memories used for storing information are optical, magnetic or electric. But there are also materials that remember ... their own shape. Objects made of these materials can be deformed past recognition, and still resume their earlier shape...
view
-
Text and photos: Jaak Kikas, TU Institute of Physics, Tartu
Translation: Liis
 
Photo 1. Thinking Putty flowing through hole in jar cover. In spite of its name, it probably doesn’t think much in the process :).

Second World War: victorious Japan is rapidly widening its territories, conquering a number of countries that are important rubber (caoutchouc) producers. The scarcity of rubber is...
view
-
Text: Jaak Kikas, UT Institute of Physics, Tartu
Photos: Jaak Kikas and Wikimedia
Translation: Liis
 
Photo 1. Ruprecht Pfalzgraf bei Rhein, Herzog von Bayern (painting by unknown artist).
 
Prince Rupert of Bavaria (Ruprecht Pfalzgraf bei Rhein, Herzog von Bayern, Photo 1), who lived in the years 1619-1682, was a man of many talents. He sometimes entertained his friends with a...
view
-
Text: Jaak Kikas, UT Institute of Physics, Tartu
Photos: Jaak Kikas and Wikimedia
Translation: Liis from forum
 
Photo 1. Drop of mercury in glass ampoule. The alchemists’ symbol for mercury is shown in the lower right-hand corner.
 
Hydrargyrum....
view
-
Text: Jaak Kikas, UT Institute of Physics
Photos: Jaak Kikas and Wikimedia
Translation: Liis from forum
 
Photo 1. Rock crystal is a variety of quartz characterised by large crystals.
 
The American West. The Indians of the Uncompahgre Ute tribe have gathered for a night ritual. One detail in their activity is interesting for us: from the...
view
-
Text: Jaak Kikas, UT Institute of Physics
Photos: Jaak Kikas and Wikimedia
Translation: Liis from forum
 
“Chemical garden”: copper silicate “plants” in a water-glass solution.
 
In the previous instalment it was stated that to obtain quartz glass very high temperatures are necessary (crystalline...
view
-
Text: Jaak Kikas, UT Institute of Physics
Photos: Jaak Kikas and Wikimedia
  
A piece of Libyan desert glass. Due to the high purity of the material light is strongly transmitted through it.
 
The year 1932. The desert survey expedition led by Patrick A. Claytoni discovers something extraordinary in western Egypt, in a desert bordering to Libya. In a rather limited area chunks of very...
view
-
Text and photos: Jaak Kikas, UT Institute of Physics

Translation: Liis from the Forum

 
Our world is a world of materials. Our history is a history of materials (we talk of the Stone Age, the Iron Age). The innumerable possible combinations of the atoms of the fewer than 100 chemical elements have given us an enormous and ever longer list of the most disparate materials. Some of them have been known since ancient times and still serve us today. Others are just out of the doors of the scientific laboratories. Some largely preserve their native character; others are changed past recognition, or maybe put together again atom by atom...
view

EST EN DE ES RU  FORUM

       

The week in pictures

My Nature Calendar

Help to do Looduskalender.ee better - send Your observations about nature.

News History