Separating elements

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• Separating set — In mathematics a set of functions S from a set D to a set C is called a separating set for D or said to separate the points of D if for any two distinct elements x and y of D , there exists a function f in S so that f ( x ) ≠ f ( y ). Examples *… …   Wikipedia

• neodymium — Symbol: Nd Atomic number: 60 Atomic weight: 144.24 Soft bright silvery metallic element, belongs to the lanthanoids. Seven natural isotopes, Nd 144 being the only radioactive one with a half life of 10^10 to 10^15 years. Six artificial… …   Elements of periodic system

• chemical element — Introduction also called  element,         any substance that cannot be decomposed into simpler substances by ordinary chemical processes. Elements are the fundamental materials of which all matter is composed.       This article considers the… …   Universalium

• листоотделяющие устройства — 3.9 листоотделяющие устройства (Separating elements; Vereinzelungselemente): Элементы самонаклада листов, заготовок или других подобных материалов, с помощью которых отдельные листы, заготовки и т.д. отделяются от стапеля и подаются в машину.… …   Словарь-справочник терминов нормативно-технической документации

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• rare-earth element — /rair errth /, Chem. any of a group of closely related metallic elements, comprising the lanthanides, scandium, and yttrium, that are chemically similar by virtue of having the same number of valence electrons. Also called rare earth metal. [1955 …   Universalium

• List of Edison patents — Below is a list of Edison patents. Thomas Edison was an inventor who, it is said, accumulated 1500 plus patents worldwide for his inventions. Nearly 1100 of Edison s patents were in the United States, but other patents were approved in countries… …   Wikipedia

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• nuclear weapon — an explosive device whose destructive potential derives from the release of energy that accompanies the splitting or combining of atomic nuclei. [1945 50] * * * or atomic weapon or thermonuclear weapon Bomb or other warhead that derives its force …   Universalium

• Physical Sciences — ▪ 2009 Introduction Scientists discovered a new family of superconducting materials and obtained unique images of individual hydrogen atoms and of a multiple exoplanet system. Europe completed the Large Hadron Collider, and China and India took… …   Universalium