**Differential mobility detector** — (DMD) is a type of microelectromechanical system, radio frequency modulated IMS (MEMS RF IMS) device. Varian CP 4900 MicroGC, four channel, with Differential Mobility Detector (first from the right) Due its small size, it easily fits into… … Wikipedia

**Differential geometry of surfaces** — Carl Friedrich Gauss in 1828 In mathematics, the differential geometry of surfaces deals with smooth surfaces with various additional structures, most often, a Riemannian metric. Surfaces have been extensively studied from various perspectives:… … Wikipedia

**differential geometry** — Math. the branch of mathematics that deals with the application of the principles of differential and integral calculus to the study of curves and surfaces. * * * Field of mathematics in which methods of calculus are applied to the local geometry … Universalium

**Cylinder (geometry)** — A right circular cylinder A cylinder is one of the most basic curvilinear geometric shapes, the surface formed by the points at a fixed distance from a given line segment, the axis of the cylinder. The solid enclosed by this surface and by two… … Wikipedia

**Cylinder stresses** — Circumferential stress is a type of mechanical stress of a cylindrically shaped part as a result of internal or external pressure. The classic example of circumferential stress is the tension applied to the iron bands, or hoops, of a wooden… … Wikipedia

**Differential refraction** — Refraction Re*frac tion (r?*fr?k sh?n), n. [F. r[ e]fraction.] 1. The act of refracting, or the state of being refracted. [1913 Webster] 2. The change in the direction of ray of light, heat, or the like, when it enters obliquely a medium of a… … The Collaborative International Dictionary of English

**differential compression check** — A maintenance check to determine the condition of piston rings and the cylinder valves of a reciprocating engine … Aviation dictionary

**differential-pressure valve** — Inside the Bosch CIS fuel distributor, these valves (there is one for each cylinder) maintain a constant pressure drop at each of the control plunger slits, regardless of changes in the quantity of fuel flow … Dictionary of automotive terms

**Hydraulic cylinder** — A Hydraulic cylinder (also called a linear hydraulic motor) is a mechanical actuator that is used to give a linear force through a linear stroke. It has many applications, notably in engineering vehicles. Operation Hydraulic cylinders get their… … Wikipedia

**Closed and exact differential forms** — In mathematics, especially vector calculus and differential topology, a closed form is a differential form α whose exterior derivative is zero (dα = 0), and an exact form is a differential form that is the exterior derivative of another … Wikipedia