deviation from cylindrical form
51Joint — A joint is the area where two bones are attached for the purpose of motion of body parts. A joint is usually formed of fibrous connective tissue and cartilage. An articulation or an arthrosis is the same as a joint. Joints are grouped according… …
52Ginkgo biloba — This article is about the tree. For the Goethe poem, see Gingo biloba. Ginkgo biloba Temporal range: 49.5–0 Ma …
53Drilling fluid — This article is about fluids used when drilling a well. For fluids used with drill bits during metal working, see cutting fluid. Driller pouring a foaming agent down the rod string on a drilling rig In geotechnical engineering, drilling fluid is… …
54Ceramics of indigenous peoples of the Americas — Moche portrait vessel, Musée du quai Branly, ca. 100 700 CE, 16 x 29 x 22 cm …
55climate change — Introduction periodic modification of Earth s climate brought about as a result of changes in the atmosphere as well as interactions between the atmosphere and various other geologic, chemical, biological, and geographic factors within the Earth …
56Contact mechanics — Continuum mechanics …
57Drilling mud — In geotechnical engineering, drilling mud, also known as spud mud (when beginning the drilling process), is a drilling fluid used to drill boreholes into the earth. Often used while drilling oil and natural gas wells and on exploration drilling… …
58Digital read out — DRO providing a three axis display with pitch circle calculator, diameter/radius conversion, absolute and incremental toggle, and inch metric toggle A digital read out (DRO) is a small computer (display unit) usually with an integrated keyboard… …
59petroleum 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 …
60Lift (force) — For other uses, see Lift. Boeing 747 8F landing A fluid flowing past the surface of a body exerts a surface force on it. Lift is the component of this force that is perpendicular to the …
