Communication of hardness to gypsum. simple recipes

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Communication of hardness to gypsum. Simple recipes and tips

Factory technologies - simple recipes

Directory / Factory technology at home - simple recipes

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How to give plaster hardness?

It is known that gypsum, mixed with water and then hardened, does not differ in strength: it becomes extremely brittle and therefore finds relatively little use for itself. In order to remedy this deficiency and to impart greater hardness to gypsum, the following method is used in America: 6 parts of gypsum are mixed with 1 part of slaked lime, and this mixture is then manipulated as with ordinary gypsum.

Items made from such a mixture, after good drying, are impregnated with a solution of zinc sulfate. Objects made of gypsum treated in this way are much stronger than ordinary gypsum crafts.

Author: Korolev V.A.

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The pleasure of new words 08.11.2014

Remembering new words, we experience pleasure, say researchers from the Otto von Guericke University (Germany) and the University of Barcelona (Spain). The experiment of Pablo Ripolles and his colleagues involved more than thirty adult volunteers who had to understand the meaning of a word from two suggestive sentences. For example, if one sentence reads "The whole family dine at table" and the second sentence reads "Table is made of wood", then from the context we can understand that table means table.

At the same time, while the person was trying to understand the meaning of the words, neuroscientists monitored the activity of his brain using functional magnetic resonance imaging (fMRI). After the language task, the volunteers had to play a certain game twice, in which winning meant a monetary reward - the game test was also conducted under fMRI observation.

In an article in Current Biology, the authors write that learning new words stimulated activity in the ventral striatum, or striatum. This is an important part of the brain, which, among other things, is part of the reinforcement system: impulses running through the striatum are directly related to motivation, pleasure, expectation of reward, goal setting, etc. And just its ventral part is especially strongly involved here, namely it works when we feel pleasure from food, sex, monetary gain, it is in it that one of the causes of drug addiction lies. Not surprisingly, her activity increased while playing for money. Interestingly, the striatum reacted to new words in the same way as to a monetary gain.

In addition, success in learning new words depended on the state of the white matter in the striatum. White matter plays the role of wires connecting different areas of the brain; and the more it is, for example, in the striatum, it means that it is more integrated with other brain "departments", the more actively it exchanges data with them.

The striatum itself has nothing to do with the language function, it does not decipher the meanings of words and does not remember them, for this there are special linguistic centers in the cerebral cortex. However, he seems to reinforce the motivation to learn the language by responding to linguistic efforts with a sense of pleasure - pleasant emotions help memorize new material.

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