We consider development of sand ripples in shallow water flows which do not reach an equilibrium height but have a time-varying ripple height that slowly reaches a maximum value and then is quickly destroyed by the fluid. A simple scenario to explain the time periodic behavior of the sand ripples...
We introduce a relativistic model for pion-nucleon scattering which includes an elementary
delta dressed by its decay. Crossing-symmetric single-particle exchange
is augmented by parametrized multiple-scattering interactions, with covariant sideways
form factors in both 3- and 4-field vertices. Causality is enforced by dispersion
relations. Unitary fits to observed on-shell amplitudes are...
A new method for evaluating the Lyapunov exponent for a Hamiltonian system
involves a spatial evaluation, rather than a numerical time integration. The
introduction of a novel vector field to the phase space allows the Lyapunov exponent
to be expressed in a form that does not involve time. The Lyapunov...
We used recent phenomenological form factors to calculate the effect of on-shell
two-pion exchange in nucleon-nucleon scattering below the two-pion production
threshold. As expected, the contributions of partial wave amplitudes are all negligible.
We also noticed that the relativistic spin-operator decomposition of the
scattering amplitude is not unique at certain...
We exhibit long-lived resonances in scattering from two-dimensional soft cage potentials comprised
of three and four Gaussian peaks. Specific low-energy resonances with very narrow width
are shown to correspond to classical multiple-reflection events. These states have much larger
probability densities inside the cage than outside and mimic bound states in...
The purpose of this paper was to study the relationship of a
high school family life course to post high school problems and
marriage role expectations. The specific objective of the study was
to determine whether or not there is a relationship between participation
in a high school family life...
The purpose of this study was to investigate the relationship between
physiological maturation and the intrapersonal relations of adolescent
girls. The Interpersonal Check List provided the measure of
self concept and ideal self concept for each subject.
Subjects were 48 early-maturing and 48 late-maturing girls
representing the four levels of...
The primary purpose of this study was to replicate a study of
Abel and Sahinkaya which investigated the emergence of race and sex
preferences of upper middle socioeconomic status Caucasian
children. This study provided a good match with respect to socioeconomic
status, race, and sex; however, the number of subjects...