Medical dictionary. 2011.
open circulation theory — one of the theories explaining how the blood in the spleen gets from the arteries to the venous sinuses; it holds that the capillaries open directly into the pulp reticulum, and that the blood gradually filters back into the venous sinuses.… … Medical dictionary
open-closed circulation theory — see closed open circulation t … Medical dictionary
closed circulation theory — one of the theories explaining how the blood in the spleen gets from the arteries to the venous sinuses; it holds that the capillaries empty directly into the venous sinuses. Cf. open circulation t. and closed open circulation t. Called also fast … Medical dictionary
Closed system (control theory) — The terms closed system and open system have long been defined in the widely (and long before any sort of amplifier was invented) established subject of thermodynamics, in terms that have nothing to do with the concepts of feedback and… … Wikipedia
Open and closed systems in social science — Ludwig Bertalanffy describes two types of systems: open systems and closed systems. The open systems are systems that allow interactions between its internal elements and the environment. An open system is defined as a “system in exchange of… … Wikipedia
plate tectonics — plate tectonic, adj. Geol. a theory of global tectonics in which the lithosphere is divided into a number of crustal plates, each of which moves on the plastic asthenosphere more or less independently to collide with, slide under, or move past… … Universalium
Timeline of Islamic science and engineering — This timeline of Islamic science and engineering covers the general development of science and technology in the Islamic world during the Islamic Golden Age, usually dated from the 7th to 16th centuries.From the 17th century onwards, the advances … Wikipedia
Perpetual motion — For other uses, see Perpetual motion (disambiguation). Robert Fludd s 1618 water screw perpetual motion machine from a 1660 wood engraving. This device is widely credited as the first recorded attempt to describe such a device in order to produce … Wikipedia
Fountain — For other uses, see Fountain (disambiguation). the Jet d eau, in Geneva (1951), rises 140 meters (459 feet) above Lake Geneva … Wikipedia
china — /chuy neuh/, n. 1. a translucent ceramic material, biscuit fired at a high temperature, its glaze fired at a low temperature. 2. any porcelain ware. 3. plates, cups, saucers, etc., collectively. 4. figurines made of porcelain or ceramic material … Universalium
