Defect

1. Absence of an electron (hence, presence of a hole) in the lattice of a semiconductor crystal. 2. An abnormality of design, construction, or performance of an electronic ...

D-defects

Semiconductors; Silicon wafer

Very small voids in Si formed by agglomeration of vacancies.

defect

Forest products; Forest engineering & harvesting

Crook, conk, decay, split, sweep, or other injury that decreases the amount of usable wood that can be obtained from a log.

air space

Building materials; Lumber

The area between insulation facing and interior of exterior wall coverings. For best results, manufacturers recommend filling this space with insulation and allowing at least 3/4" ...

annual ring

Building materials; Lumber

The rings that are generated each year as a tree grows. The age of the tree can be determined by counting the growth rings. The size of the rings can also indicate what type of ...

compression web

Building materials; Lumber

A member of a truss which connects the bottom and top chords and provides downward support.

conifer

Building materials; Lumber

Conifer species are trees or shrubs of the evergreen variety that bear cones. An example would be the pine.

coniferous forests

Building materials; Lumber

Forests comprised of mostly cone bearing trees such as pine forests.

convection

Building materials; Lumber

Currents created by heating air, which then rises and pulls cooler air behind it.

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Industry/Domain: People Category: Astronomers

Neil Armstrong

Neil Armstrong (August 5, 1930 – August 25, 2012) was an American astronaut, Navy fighter pilot, NASA test pilot, aerospace engineer, and university ...