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Gadolinium is a chemical element; it has symbol Gd and atomic number 64. Gadolinium is a silvery-white metal when oxidation is removed. It is a malleable and ductile rare-earth element. Gadolinium reacts with atmospheric oxygen or moisture slowly to form a black coating. Gadolinium below its Curie point of 20 °C (68 °F) is ferromagnetic, with ...
Geometric dimensioning and tolerancing ( GD&T) is a system for defining and communicating engineering tolerances via a symbolic language on engineering drawings and computer-generated 3D models that describes a physical object's nominal geometry and the permissible variation thereof. GD&T is used to define the nominal (theoretically perfect ...
General Dynamics. General Dynamics Corporation ( GD) is an American publicly traded aerospace and defense corporation headquartered in Reston, Virginia. As of 2020, it was the fifth-largest defense contractor in the world by arms sales, and fifth largest in the United States by total sales. [2]
talk. edit. Naturally occurring gadolinium ( 64 Gd) is composed of 6 stable isotopes, 154 Gd, 155 Gd, 156 Gd, 157 Gd, 158 Gd and 160 Gd, and 1 radioisotope, 152 Gd, with 158 Gd being the most abundant (24.84% natural abundance ). The predicted double beta decay of 160 Gd has never been observed; only a lower limit on its half-life of more than ...
Gross Domestic Product ( GDP) is a monetary measure of the market value [2] of all the final goods and services produced and rendered in a specific time period by a country [3] or countries. [4] [5] [6] GDP is often used to measure the economic health of a country or region. [3] Definitions of GDP are maintained by several national and ...
Gestational diabetes is a condition in which a person without diabetes develops high blood sugar levels during pregnancy. [2] Gestational diabetes generally results in few symptoms; [2] however, it increases the risk of pre-eclampsia, depression, and of needing a Caesarean section. [2] Babies born to individuals with poorly treated gestational ...
Gadobutrol is a medicinal product used in diagnostic magnetic resonance imaging (MRI) in adults and children. It provides contrast enhancement during cranial, spinal, breast, or other investigations. In the central nervous system, Gadobutrol works by highlighting any areas with disrupted blood brain barrier (BBB) and/or abnormal vascularity.
Gradient descent is a method for unconstrained mathematical optimization. It is a first-order iterative algorithm for finding a local minimum of a differentiable multivariate function . The idea is to take repeated steps in the opposite direction of the gradient (or approximate gradient) of the function at the current point, because this is the ...