directional flow control valve
31Microphone — For the indie film, see Microphone (film). Microphones redirects here. For the indie band, see The Microphones. A …
32rocket and missile system — ▪ weapons system Introduction any of a variety of weapons systems that deliver explosive warheads to their targets by means of rocket propulsion. Rocket is a general term used broadly to describe a variety of jet propelled missiles… …
33Oil well — The pumpjack, such as this one located south of Midland, Texas, is a common sight in West Texas. An oil well is a general term for any boring through the earth s surface that is designed to find and acquire petroleum oil hydrocarbons. Usually… …
34Pipeline transport — An elevated section of the Alaska Pipeline …
35Brass instrument — A brass instrument is a musical instrument whose tone is produced by vibration of the lips as the player blows into a tubular resonator. They are also called labrosones , literally meaning lip vibrated instruments (Baines, 1993).There are two… …
36sports — /spawrts, spohrts/, adj. 1. of or pertaining to a sport or sports, esp. of the open air or athletic kind: a sports festival. 2. (of garments, equipment, etc.) suitable for use in open air sports, or for outdoor or informal use. [1910 15; SPORT +… …
37HVAC — may also stand for High voltage alternating current. See also: Glossary of HVAC HVAC systems use ventilation air ducts installed throughout a building that supply conditioned air to a room through rectangular or round outlet vents, called… …
38petroleum production — Introduction recovery of crude oil and, often, associated natural gas from the Earth. petroleum is a naturally occurring hydrocarbon material that is believed to have formed in deep sedimentary (sedimentary rock) beds from animal and …
39Membraneless Fuel Cells — convert stored chemical energy into electrical energy without the use of a conducting membrane as with other types of fuel cells. In Laminar Flow Fuel Cells (LFFC) this is achieved by exploiting the phenomenon of non mixing laminar flows where… …
40Congenital heart defect — Classification and external resources The normal structure of the heart (left) in comparison to two common locations for a ventricular septal defect (right), the most common form of congenital heart defect.[1] …
