density of electrons
61Mathematics and Physical Sciences — ▪ 2003 Introduction Mathematics Mathematics in 2002 was marked by two discoveries in number theory. The first may have practical implications; the second satisfied a 150 year old curiosity. Computer scientist Manindra Agrawal of the… …
62chemical bonding — ▪ chemistry Introduction any of the interactions that account for the association of atoms into molecules, ions, crystals, and other stable species that make up the familiar substances of the everyday world. When atoms approach one another …
63electrochemical reaction — ▪ chemistry Introduction any process either caused or accompanied by the passage of an electric current and involving in most cases the transfer of electrons between two substances one a solid and the other a liquid. Under ordinary… …
64Theorie de la fonctionnelle de la densite — Théorie de la fonctionnelle de la densité Méthodes numériques pour le calcul de la structure électronique Hartree Fock Théorie de la perturbation de Møller Plesset Interaction de configuration Méthode du cluster couplé Champ multi… …
65Théorie de la fonctionnelle densité — Théorie de la fonctionnelle de la densité Méthodes numériques pour le calcul de la structure électronique Hartree Fock Théorie de la perturbation de Møller Plesset Interaction de configuration Méthode du cluster couplé Champ multi… …
66Théorie de la fonctionnelle de la densité — Pour les articles homonymes, voir DFT. La théorie de la fonctionnelle de la densité (pour Density Functional Theory, sous entendu électronique : DFT) constitue au début du XXIe siècle l une des méthodes les plus utilisées dans les… …
67plasma — plasmatic /plaz mat ik/, plasmic, adj. /plaz meuh/, n. 1. Anat., Physiol. the liquid part of blood or lymph, as distinguished from the suspended elements. 2. Cell Biol. cytoplasm. 3. whey. 4. a green, faintly translucent chalcedony. 5. Physics. a …
68Physical 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… …
69electron tube — an electronic device that consists, typically, of a sealed glass bulb containing two or more electrodes: used to generate, amplify, and rectify electric oscillations and alternating currents. Also called electronic tube. Cf. gas tube, vacuum tube …
70nebula — nebular, adj. /neb yeuh leuh/, n., pl. nebulae / lee , luy /, nebulas. 1. Astron. a. Also called diffuse nebula. a cloud of interstellar gas and dust. Cf. dark nebula, emission nebula, reflection nebula …
