Showing papers on "Deceleration parameter published in 1983"

A special law of variation for Hubble’s parameter

Abstract: A law of variation for Hubble’s parameter in evolutionary models, that yields a constant value for the deceleration parameter, is presented. It leads naturally to the exclusion of open universes.

Physical Constants as Cosmological Constraints

Abstract: A solution to the primary “missing mass” problem is found in the context of accounting for the coincidence of large dimensionless numbers first noticed by Weyl, Eddington, and Dirac. This solution entails (1) a log2 relation between the electromagnetic and gravitational coupling constants; (2) setting the maximum radius of curvature at the gravitational radius, 2GM/c2; (3) a changing gravitational parameterG, which varies as an inverse function of the universal radius of curvature. These features motivate the development of a neo-Friedmann formalism, which employs a function,e(χ). governing the change from Euclidian to non-Euclidian volumes. Observational consequences include (1) a universal density of 7.6×10−31g cm−3, (2) a Hubble parameter of 15 km s−1 Mpc−1, (3) an age of the universe of 32×109 yr, (4) a gravitational parameter diminishing at a current rate of 2.2×10−12 yr−1, and (5) a deceleration parameter of 1.93. Moreover, it is shown that for a Friedmann-type (λ=0) cosmology (whether open or closed) any deceleration parameter will be represented by a straight line in the (log-log) red shift: luminosity-distance space of the Hubble diagram. The major claim of this paper is that we have devised a model in which the large-scale structure of the universe is completely determined by the values of the fundamental physical constants:c, h, e, andme setting the scale, andG selecting the epoch.

Electronic controller for air-fuel ratio of internal-combustion engine

Abstract: PURPOSE:To heighten the accuracy of compensation responsive to acceleration and deceleration, by detecting the acceleration and deceleration state and compensating the air fuel ratio every time the detection signal of an acceleration and deceleration parameter has changed by a prescribed value. CONSTITUTION:The output of an intake amount detector 2 is used as an operation parameter of an engine. A register 11, in which the value of the parameter is stored, and a comparator 13 are provided. The instantaneous output value of a throttle valve opening degree detector 6 and the value stored in the register 11 are compared with each other by the comparator 13. When the deviation value between the compared values has exceeded a prescribed value, the output of the register 11 is renewed. According to this constitution, lag at the time of sharp acceleration and deceleration and wrong detection at the time of slow acceleration and deceleration are avoided so that the air-fuel ratio is accurately compensated according to the acceleration and deceleration.

Redshifts and Large Scale Structures

Abstract: The effort to measure the geometry of space by experiment, that is, the determination of the Hubble Constant, Ho, and of the deceleration parameter, qo, led toward the end of the first half of the century, to the classical paper by Humason, Mayall, and Sandage (1956). Their catalogue contains 920 redshifts collected over a twenty-year period (1935–1955). Further redshifts of galaxies were measured to refine such determinations and to study the dynamics of clusters (Zwicky 1933).