reciprocity
111Organ gifting — Several authors have used the terms organ gifting and “tissue gifting” to describe processes behind organ and tissue transfers that are not captured by more traditional terms such as donation and transplantation. The concept of “gift of life” in… …
112Altruism — Selflessness redirects here. For the 1965 jazz album, see Selflessness: Featuring My Favorite Things. Giving alms to the poor is often considered an altruistic action in many cultures and religions. Altruism …
113Radiation pattern — Three dimensional antenna radiation patterns. The radial distance from the origin in any direction represents the strength of radiation emitted in that direction. The top shows the directive pattern of a horn antenna, the bottom shows the… …
114Gaussian integer — In number theory, a Gaussian integer is a complex number whose real and imaginary part are both integers. The Gaussian integers, with ordinary addition and multiplication of complex numbers, form an integral domain, usually written as Z[i]. The… …
115Film speed — is the measure of a photographic film s sensitivity to light, determined by sensitometry and measured on various numerical scales, the most recent being the ISO system. A closely related ISO system is used to measure the sensitivity of digital… …
116Quadratic residue — In number theory, an integer q is called a quadratic residue modulo n if it is congruent to a perfect square modulo n; i.e., if there exists an integer x such that: Otherwise, q is called a quadratic nonresidue modulo n. Originally an abstract… …
117British nationality law and Hong Kong — British nationality law as it pertains to Hong Kong has been a unique situation ever since Hong Kong was created a British colony in 1842. With its beginning as a trading port to today s cosmopolitan international financial centre, the territory… …
118Number theory — A Lehmer sieve an analog computer once used for finding primes and solving simple diophantine equations. Number theory is a branch of pure mathematics devoted primarily to the study of the integers. Number theorists study prime numbers (the… …
119Exposure (photography) — Underexposure redirects here. For the 2005 film by Oday Rasheed, see Underexposure (2005 film). A long exposure showing stars rotating around the southern and northern celestial poles. Credit: European Southern Observatory …
120Antenna (radio) — Whip antenna on car …
