pre-vacuum
1Pre-Columbian — The pre Columbian era incorporates all period subdivisions in the history and prehistory of the Americas before the appearance of significant European influences on the American continents. While technically referring to the era before… …
2Vacuum mattress — A vacuum mattress, or vacmat, is a medical device used for the immobilisation of patients, especially in case of a vertebra, pelvis or limb trauma (especially for femur trauma). It is also used for manual transportation of patients for short… …
3Pre-Columbian Mesoamerica — The pre Columbian history of Mesoamerica is known through the work of archaeologists and epigraphers, and through the accounts of the conquistadors, clergymen, and indigenous chroniclers of the immediate post conquest period. While relatively few …
4Vacuum furnace — A vacuum furnace is a type of furnace that can heat materials, typically metals, to very high temperatures and carry out processes such as brazing, sintering and heat treatment with high consistency and low contamination. In a vacuum furnace the… …
5pre-Columbian civilizations — Introduction the aboriginal American Indian (Mesoamerican Indian) cultures that evolved in Meso America (part of Mexico and Central America) and the Andean region (western South America) prior to Spanish exploration and conquest in the 16th …
6Timeline of aviation - pre-18th century — pre 10th century aviation*c 1700 BC ** Greek myth of Icarus and Daedalus explores the desire to fly and the inherent dangers of it. [Gunston, 2001 p.12] *c. 1000 BC ** mythical flying machines called Vimanas are mentioned in the Vedas *c. 850 BC… …
7QCD vacuum — The QCD vacuum is the vacuum state of quantum chromodynamics (QCD). It is an example of a non perturbative vacuum state, characterized by many non vanishing condensates such as the gluon condensate or the quark condensate. These condensates… …
8List of vacuum tubes — This is a list of vacuum tubes or thermionic valves. Before the advent of semiconductor devices, hundreds of tube types were used in consumer and industrial electronics; today only a few types are still used in specialized applications. Contents… …
9Central vacuum cleaner — The power unit of a typical central vacuum cleaner for residential use A central vacuum cleaner (also known as built in or ducted) is a type of vacuum cleaner appliance, installed into a building as a semi permanent fixture. Central vacuum… …
10Rotary vacuum-drum filter — Rotary vacuum filter drum processes start with a pre coat usually consisting of diatomaceous earth (DE) or other types of filter aid. After pre coat has been applied, a broth is sent to the bed of the drum. The drum skims the surface of the broth …
