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This solution, often called the Robertson–Walker metric since they proved its generic properties, is different from the dynamical "Friedmann–Lemaître" models, which are specific solutions for a (t) that assume that the only contributions to stress–energy are cold matter ("dust"), radiation, and a cosmological constant.
Cycle of abuse. The cycle of abuse is a social cycle theory developed in 1979 by Lenore E. Walker to explain patterns of behavior in an abusive relationship. The phrase is also used more generally to describe any set of conditions which perpetuate abusive and dysfunctional relationships, such as abusive child rearing practices which tend to get ...
[5] [11] DWM is the cause of around 4.3% of cases of congenital hydrocephalus [14] and 2.5% of all cases of hydrocephalus. [6] A 2017 review found that most patients (65%) were diagnosed with either "Dandy–Walker malformation" or "Dandy–Walker syndrome", while 20% were diagnosed with "Dandy–Walker variant" and 1.1% with "mega cisterna ...
The P-loop main chain is shown in red, the Mg 2+ ion as green sphere and the side chains of the amino acids K16 and S17 are shown as sticks. Walker A motif, also known as the Walker loop, or P-loop, or phosphate-binding loop, is a motif in proteins that is associated with phosphate binding. The motif has the pattern G-x (4)-GK- [TS], where G, K ...
The Millennium Prize Problems are seven well-known complex mathematical problems selected by the Clay Mathematics Institute in 2000. The Clay Institute has pledged a US $1 million prize for the first correct solution to each problem. The Clay Mathematics Institute officially designated the title Millennium Problem for the seven unsolved ...
The Walker circulation, also known as the Walker cell, is a conceptual model of the air flow in the tropics in the lower atmosphere (troposphere). According to this model, parcels of air follow a closed circulation in the zonal and vertical directions. This circulation, which is roughly consistent with observations, is caused by differences in ...
Matthew Walker is a British author, scientist and professor of neuroscience and psychology at the University of California, Berkeley. [1][3][4][5] As an academic, Walker has focused on the impact of sleep on human health. He has contributed to many scientific research studies. [1] Why We Sleep (2017) is his first work of popular science.
Jimmie Walker. James Carter Walker Jr. (born June 25, 1947) is an American actor and comedian. He portrayed James ("J.J.") Evans Jr., the older son of James Evans Sr. and Florida Evans, on the CBS television comedy series Good Times. The show ran from 1974 to 1979, and Walker was nominated for a Golden Globe Award in 1975 and 1976 for his role ...