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Superalloy development relies on chemical and process innovations. Superalloys develop high temperature strength through solid solution strengthening and precipitation strengthening from secondary phase precipitates such as gamma prime and carbides. Oxidation or corrosion resistance is provided by elements such as aluminium and chromium.
The sexual revolution describes a change in attitudes and actions regarding sex in Western cultures. It came to a head in the early 1960s, leading to emerging adulthood as a stage. This was due to young adults having sexual relations or children before marriage. [46] While it came to a head in the 1960s, the sexual revolution started long before.
Cultural selection theory has so far never been a separate discipline. [2] However it has been proposed [3] that human culture exhibits key Darwinian evolutionary properties, and "the structure of a science of cultural evolution should share fundamental features with the structure of the science of biological evolution". [3]
Dual inheritance theory (DIT), also known as gene–culture coevolution or biocultural evolution, [1] was developed in the 1960s through early 1980s to explain how human behavior is a product of two different and interacting evolutionary processes: genetic evolution and cultural evolution.
Cultural evolution is an evolutionary theory of social change. It follows from the definition of culture as "information capable of affecting individuals' behavior that they acquire from other members of their species through teaching, imitation and other forms of social transmission". [1] Cultural evolution is the change of this information ...
As a result of simplistic notions of "progressive evolution", more modern, complex cultural evolution theories (such as dual inheritance theory, discussed below) receive little attention in the social sciences, having given way in some cases to a series of more humanist approaches. Some reject the entirety of evolutionary thinking and look ...
The concept of adulthood has legal and socio-cultural definitions. The legal definition [ 4 ] of an adult is a person who is fully grown or developed. This is referred to as the age of majority , which is age 18 in most cultures, although there is a variation from 15 to 21.
[4] [5] Cultural evolution, the domain of research focused on how culture changes through time due to different individual transmission mechanisms and population-level effects, often uses models derived from population genetics, in which agents are passive recipients of cultural traits (e.g. Bentley et al., 2004 [6]). While evolutionary ...