Showing papers on "Crossover published in 1978"

A renormalization group analysis of the hierarchical model in statistical mechanics

Abstract: Probabilistic formulation of the problem.- The RG-transformation for the hierarchical model.- The existence of a non-trivial fixed point.- The flow around the fixed point.- Discussion of the critical indices.- Global properties of the flow.- Discussion of the thermodyamic limit.- Perturbation theory.- Explicit perturbation calculation for the Eigenvalue ?2.- Linear problems and the existence of ??.- Differentiability of o?.- The normal form of the flow.- Crossover. Part 2.- Crossover, Part II. A) Single phase region.- Crossover Part II. B) Two phase region.- Miscellaneous short proofs.

Classifications and comparisons of multilocus recombination distributions

Abstract: Various classifications and representations of multilocus recombination structures are delineated based on generalized notions of linkage values and recombination rates. An important class of recombination distributions (called the count-location chiasma process) is parameterized by a distribution of the number of crossover events and, for each such crossover count, by a conditional distribution of crossover locations. A number of properties of this recombination structure are developed. A multilocus definition of a “natural” recombination range is set forth. Orderings among recombination distributions in the multilocus setting are also discussed. Comparisons are made in terms of complete linkage, free assortment and noninterference schemes serving as standards.

Specific structures for large-scale state estimation algorithms having information exchange

Abstract: This paper considers the design and evaluation of large-scale state estimation algorithms having specific structures which allow the subsystems to exchange information over noisy channels. The specific structures which are presented are first motivated by considering the relative performance between the surely locally unbiased filter and a global dynamics filter. The role of the surely locally unbiased filter in evaluating the tradeoffs between the cost of information transfer and filter performance is examined and a theorem is presented which forms the basis for an algorithm for calculating channel noise crossover levels. The theoretical results are illustrated via an application to a power system model.

Quantum crossover in the transverse Ising model

Abstract: The critical behaviour of d dimensional Ising models in a transverse magnetic field, Gamma , is investigated using a quantal generalisation of the Landau-Ginzburg-Wilson free-energy functional introduced by Hertz and Young (1976). A variational approximation of the Hartree type allows a detailed analysis: behaviour near the critical line, Gamma = Gamma c(T) is governed by the exponents of the d dimensional spherical model (which are mean-field-like for d>or=4). However, the point ( Gamma ,T)=( Gamma c(0),0) is multicritical in nature, and characterised by the exponents of the (d+1) dimensional spherical model. Crossover scaling functions, valid near the multicritical point, are found for the longitudinal susceptibility and free energy. They involve the crossover exponent phi T; for 2 4, no crossover occurs. These results are shown to be consistent, for all d>2, with the finite-size scaling analogy suggested by Suzuki (1976) and others.

Pre/post-collation copying system

Abstract: A dual mode copier which automatically switches the recirculating document handler and copy output system between pre-collation and post-collation modes of operation in response to a selection in the copy counter control of a number of copies which exceeds a pre-set crossover copy count, but which provides a first pre-collation proof set in both modes.

Apparatus for dynamically timing a diesel engine

Abstract: A timing method and timing apparatus are provided for dynamically timing an apparatus. The timing method includes operating the apparatus to be timed, and generating a signal having a zero crossover portion, and generating a timing signal in response to the signal reaching the zero crossover portion. The timing apparatus receives the signal and generates the timing signal in response to the signal reaching the zero crossover portion.

Compensated crossover network

Abstract: The signal from the crossover network of an audio output circuit is applied to certain of the audio system's low, middle and high frequency speakers through particular compensation circuits that are associated with the crossover network and the speaker driver coils. These compensation networks include: a resistor-inductor-capacitor sequence of selected values connected across the terminals of a high frequency or other driver whose resonant impedance peak must be compensated to a resistive impedance for optimum crossover; a resistor-capacitor sequence of selected values connected across the terminals of a low frequency or other driver whose inductance must be compensated to a resistive impedance for optimum crossover; and a variable inductor connected in series with one or more of the terminals of any driver where a "roll off" at higher frequency may be desired. The result is more faithful audio reproduction.

Crossover differences as an indication of survey accuracy

Abstract: Differences in values obtained at trackline crossovers can be used to give an indication of the overall accuracy of marine geophysical surveys. A study of the statistical validity and interpretative value of several parameters commonly used to summarize crossover discrepancies has been made. It was found that the interpretation of commonly reported statistical parameters such as standard deviation and R.M.S. error can be complicated by the presence of a systematic error in the survey data, by possible non-normalities in the error distribution, or by the use of a distribution of positive differences. A standard procedure for the analysis of survey error on the basis of crossover discrepancies is outlined, including techniques for estimating systematic survey errors and for the evaluation of the normality of the observed distribution of crossover discrepancies.