The orbital evolution of cataclysmic variables in which the companion is illuminated by a fraction of the accretion luminosity consists of irradiation–driven limit cycles on thermal timescales, superimposed on a secular evolution toward shorter periods due to systemic angular momentum losses. We show that positive orbital period derivatives during bright phases are a natural consequence of the ...

We present a secular theory of a coplanar N-planet system, in the absence of mean motion resonances between the planets. This theory relies on the averaging of a perturbation to the two-body problem over the mean longitudes. We expand the perturbing Hamiltonian in Taylor series with respect to the ratios of semi-major axes which are considered as small parameters, without direct restrictions on...

The world’s religions have made a contribution to environmental conservation and sustainable development through faith-based non-governmental organizations. Partnerships between secular conservation and development organizations and faith-based groups, however, are not always easy. Such partnerships face various challenges, including differences in worldviews, conflict between identities, and t...

Rapid secular variation pulses in the Earth’s geomagnetic field have been identified during the last decade. In particular, the 2014 jerk is the latest in a series of localised rapid secular variation events observed at the Earth’s surface which are thought to be the result of rapid oscillations at the core surface approximately at a depth of 3000 km. In Southern Africa, the 2014 jerk has been ...

PURPOSE/OBJECTIVES To examine the differences among secular, traditional, and religious Israeli oncology nurses' intrinsic religiosity, extrinsic religiosity, spiritual well-being, and attitudes toward spiritual care. DESIGN A comparative, descriptive study. SAMPLE 148 Israeli Jewish nurses drawn from the membership of the Israeli Oncology Nursing Association. METHODS Nurses completed mai...

A strong bar rotating within a massive halo should lose angular momentum to the halo through dynamical friction, as predicted by Weinberg. We have conducted fully self-consistent, numerical simulations of barred galaxy models with a live halo population and find that bars are indeed braked very rapidly. Specifically, we find that the bar slows sufficiently within a few rotation periods that the...

Secular Buddhism is coalescing today in response to two main factors. First, it rejects the incoherence of Buddhist modernism, a protean formation that accommodates elements as far afield as ancestral Buddhism and psychotherapies claiming the Buddhist brand. Second, it absorbs the cultural influence of modern secularity in the West. Historically understood, secularity has constituted a centurie...

In Dr Moell's series of cases there was no increase in weight velocity when steroids were omitted from reinduc-tion therapy. Their attained height (-0.06 standard deviation score) and weight (-0.03 standard deviation score) at diagnosis were comparable. Weight velocity remained normal during maintenance therapy, whereas height velocity was reduced. Consequently, by the stopping of treatment the...

It is now a well established fact that galaxies undergo significant morphological transformation during their lifetimes, manifesting as an evolution along the Hubble sequence from the late to the early Hubble types. The physical processes commonly believed to be responsible for this observed evolution trend, i.e. the major and minor mergers, as well as gas accretion under a barred potential, th...

Studies that use cross-sectional data have shown an increase in the prevalence of childhood obesity, as assessed by BMI (weight in kilograms divided by height in meters squared), over the past 30 y in the United States (1). Between the 1960s and 2000 the distribution of BMI among children became more skewed, whereas between 2000 and 2010 there was relatively little change among either boys or g...