Hafnium
71Nuclear isomer — A nuclear isomer is a metastable state of an atomic nucleus caused by the excitation of one or more of its nucleons (protons or neutrons). Metastable refers to the fact that these excited states have half lives more than 100 to 1000 times the… …
72Control rod — PWR control rod assembly, above fuel element A control rod is a rod made of chemical elements capable of absorbing many neutrons without fissioning themselves. They are used in nuclear reactors to control the rate of fission of uranium and… …
73Tantalum — Eigenschaften …
74Zircaloy — (de l anglais Zirconium et « alloy » = alliage) est un nom générique et de marque donné à un groupe d alliages de zirconium (Solutions solides). « Crayon » constitué d un tube de zircaloy destiné à recevoir un empilement de… …
75Подгруппа титана — Общие сведения Состав группы Титан, цирконий, гафний, резерфордий Период открытия XVIII XX вв. Нахождение в природе …
76hafniu — HÁFNIU s.n. Element chimic, metal rar, asemănător cu oţelul, care se găseşte în minereurile de zirconiu şi care se întrebuinţează în electrotehnică; celţiu. – Din fr. hafnium, germ. Hafnium. Trimis de gall, 13.09.2007. Sursa: DEX 98 HÁFNIU s.… …
77Dictionary of chemical formulas — This is a list of chemical compounds with chemical formulas and CAS numbers, indexed by formula. This complements alternative listings to be found at list of inorganic compounds, list of organic compounds and inorganic compounds by element. Table …
78Dirk Coster — (October 5, 1889– February 12, 1950), was a Dutch physicist. He was a Professor of Physics and Meteorology at the University of Groningen. Coster was born in Amsterdam. On February 26, 1919, he married Lina Maria Wijsman, who held a degree in… …
79Barre de contrôle (nucléaire) — Pour les articles homonymes, voir Barre de contrôle. Barres de contrôle (2006) Sommaire …
80Zirconium — (pronEng|zɚˈkoʊniəm, IPA|/ˌzɝˈkoʊniəm/) is a chemical element with the symbol Zr and atomic number 40. It is a lustrous, gray white, strong transition metal that resembles titanium. Zirconium is used as an alloying agent due to its high… …
