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Wyszukujesz frazę "atom" wg kryterium: Temat


Wyświetlanie 1-2 z 2
Tytuł:
The scientific and cultural role of atomistics
Autorzy:
Sosnowski, R.
Powiązania:
https://bibliotekanauki.pl/articles/147868.pdf
Data publikacji:
2005
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
atom
history of science
structure of matter
Opis:
The development of the idea that atoms are the building blocks of matter is presented. This hypothesis began in the Ancient Greece and, independently, in the Ancient India. Arguments are presented that the fact that the atomic theory started in these two regions and not e.g. in Egypt, China or by the Mayas can be linked to their writing. In both Greece and India the alphabet contained letters and not pictograms as used in the three other cultures. The role of Islamic scholars in preserving the knowledge of the ancient atomic theories is presented. In the Middle Ages a significant part of the Greek philosophic treatises have been firstly learned via the Arab translations. It is shown that the atomic concept has not been developed in the Middle Ages. This was because the church found it to be in a disagreement with the Holy Scripture. The start of the modern scientific atomic theory is presented and the role of the established quantitative laws of chemical reactions is discussed. Arguments are presented that the atoms discovered in the nineteenth century did not have the qualities of the atoms proposed by the Ancient Greek philosophers. Contrary to the atoms proposed by the Greeks the former can be decomposed into more fundamental parts. The discussion of the possibility that quarks, leptons and quanta of interactions fields meet the above qualities is presented.
Źródło:
Nukleonika; 2005, 50,suppl.3; 5-10
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Production of 166Ho and 153Sm using hot atom reactions in neutron irradiated tris(cyclopentadienyl) compounds
Autorzy:
Nassan, L.
Achkar, B.
Yassine, T.
Powiązania:
https://bibliotekanauki.pl/articles/147591.pdf
Data publikacji:
2011
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
hot atom reactions
holmium-166
miniature nuclear source reactor (MNSR)
Opis:
The behavior of a recoiled 166Ho and 153Sm resulting from the reactions 165Ho(n,gamma)166Ho and 152Sm(n,gamma)153Sm in the organometallic compounds tris(cyclopentadienyl)holmium (C5H5)3Ho(III), and tris(cyclopentadienyl)samarium (C5H5)3Sm(III) were investigated. Several chemical separation methods were developed for each compound to separate the recoil products from the irradiated compound. Retention value of 0.2 �} 0.1% was obtained for (C5H5)3Ho(III) using sublimation. Another value of retention of 0.4 plus or minus 0.1% resulted when column chromatography was used. Paper chromatography (using Whatman Chr. 1 and Whatman Chr. 4) gave different retention values of about 0.11 plus or minus 0.05%, and 0.4 plus or minus 0.1%, respectively. Similar behavior of 153Sm in irradiated (C5H5)3Sm(III) was found when paper chromatography was used for separation. The different retention values given by different methods of separation were discussed. An important improvement of the specific activity was achieved as compared with other published results in this field. The obtained results pointed out that tris(cyclopentadienyl)holmium and samarium could be used to produce high specific activity of 166Ho and 153Sm in the Syrian low flux miniature nuclear source reactor (MNSR), where the averaged achieved enrichment factor for holmium compound was found to be greater than 1.6 x 107.
Źródło:
Nukleonika; 2011, 56, 4; 263-267
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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