The Chaotic Long-term X-ray Variability of 4U 1705-44.

The low-mass X-ray binary 4U1705-44 exhibits dramatic long-term X-ray time variability with a timescale of several hundred days. The All-Sky Monitor () aboard the () and the Japanese () aboard the International Space Station together have continuously observed the source from December 1995 through May 2014. The combined data provide a continuous time series over fifty times the length of the timescale of interest.

Orthodontists' perceptions of the need for orthognathic surgery in patients with Class II Division 1 malocclusion based on extraoral examinations.

Introduction: The purpose of this study was to establish the influence of soft-tissue profile values on the decision of orthodontists to recommend orthognathic surgery for patients with Class II Division 1 malocclusion.

Methods: A questionnaire containing 40 profile photographs of adults with Class II Division 1 malocclusion was sent to all 256 consultant orthodontists in the United Kingdom asking for a "yes" or "no" response to the question: "Based on the profile view of this patient, would you treat this patient using an orthognathic surgical approach?" A soft-tissue analysis was carried out on each photograph, and multi-level logistic regression was used to investigate factors that affect the decision to recommend surgery.

Results: The response rate was high: 208 of 256 questionnaires (81.

Rheumatic heart disease in pregnancy: cardiac and obstetric outcomes.

Background: Rheumatic heart disease (RHD) remains an important health issue for indigenous women of child-bearing age in northern Australia. However, the influence of RHD on maternal outcomes with current clinical practice is unclear.

Aims: To determine maternal cardiac complications and obstetric outcomes in patients with RHD.

A survey of denture identification marking within the United Kingdom.

Aim: To assess the attitudes of healthcare workers within the UK towards identification marking of removable prostheses, and quantify the frequency with which this is currently undertaken.

Design: A postal questionnaire-based study.

Setting: The study was undertaken within the UK between 2002 and 2006 and surveyed prosthodontists working in a wide range of clinical settings.

The association of GRB 060218 with a supernova and the evolution of the shock wave.

Although the link between long gamma-ray bursts (GRBs) and supernovae has been established, hitherto there have been no observations of the beginning of a supernova explosion and its intimate link to a GRB. In particular, we do not know how the jet that defines a gamma-ray burst emerges from the star's surface, nor how a GRB progenitor explodes. Here we report observations of the relatively nearby GRB 060218 (ref.

Gamma-ray bursts: huge explosion in the early Universe.

Long gamma-ray bursts (GRBs) are bright flashes of high-energy photons that can last for tens of minutes; they are generally associated with galaxies that have a high rate of star formation and probably arise from the collapsing cores of massive stars, which produce highly relativistic jets (collapsar model). Here we describe gamma- and X-ray observations of the most distant GRB ever observed (GRB 050904): its redshift (z) of 6.29 means that this explosion happened 12.

A short gamma-ray burst apparently associated with an elliptical galaxy at redshift z = 0.225.

Gamma-ray bursts (GRBs) come in two classes: long (> 2 s), soft-spectrum bursts and short, hard events. Most progress has been made on understanding the long GRBs, which are typically observed at high redshift (z approximately 1) and found in subluminous star-forming host galaxies. They are likely to be produced in core-collapse explosions of massive stars.

The relationship between social ties and survival among black and white breast cancer patients. National Cancer Institute Black/White Cancer Survival Study Group.

The relationship between social ties, stage of disease, and survival was analyzed in a population-based sample of 525 black and 486 white women with newly diagnosed breast cancer. There were significant differences between the two race groups in reported social ties. Using logistic regression to adjust for the effects of age, race, study area, education, and the presence of symptoms, there was little or no evidence for an association between individual network measures of social ties and stage of disease.

Chaotic scattering in the gravitational three-body problem.

We summarize some results of an ongoing study of the chaotic scattering interaction between a bound pair of stars (a binary) and an incoming field star. The stars are modeled as point masses and their equations of motion are numerically integrated for a large number of initial conditions. The global features of the resulting initial-value space maps are presented, and their evolution as a function of system parameters is discussed.