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11 ώρες πριν · The paper considers an axisymmetric stress state of a homogeneous elastic space with a circular disc-shaped crack, one of the edges of which is pressed into a cylindrical circular stamp with static friction. It is assumed that the contact zone is considered under the generalized law of dry friction, i.e. tangential contact stresses are proportional to normal contact pressure, while the ...
11 ώρες πριν · The concept of critical community size was first put forward by Bartlett, a British statistician, when he observed the relationship between the period of measles and the population size in different areas of England and Wilson in the 1950s [1,2,3].However, he gave the approximate interval of critical community size based on statistical methods, and then scholars used dynamic system methods ...
11 ώρες πριν · History. The Dirac equation in the form originally proposed by Dirac is:: 291 (+ =) (,) = (,) where ψ(x, t) is the wave function for an electron of rest mass m with spacetime coordinates x, t. p 1, p 2, p 3 are the components of the momentum, understood to be the momentum operator in the Schrödinger equation. c is the speed of light, and ħ is the reduced Planck constant.
11 ώρες πριν · Hartsfield–Jackson Atlanta International Airport (IATA: ATL, ICAO: KATL, FAA LID: ATL) is the primary international airport serving Atlanta and its surrounding metropolitan area, in the U.S. state of Georgia.The airport is located 10 miles (16 km; 8.7 nmi) south of the Downtown Atlanta district. It is named after former Atlanta mayors William B. Hartsfield and Maynard Jackson.
