Optical/Infrared Observations of the Anomalous X-ray Pulsar 1E 1048.1-5937 During Its 2007 X-Ray Flare

We report on optical and infrared observations of the anomalous X-ray pulsar (AXP) 1E 1048.1-5937, made during its ongoing X-ray flare which started in 2007 March. We detected the source in the optical I and near-infrared Ks bands in two ground-based observations and obtained deep flux upper limits from four observations, including one with the Spitzer Space Telescope at 4.5 and 8.0 microns. The detections indicate that the source was approximately 1.3--1.6 magnitudes brighter than in 2003--2006, when it was at the tail of a previous similar X-ray flare. Similar related flux variations have been seen in two other AXPs during their X-ray outbursts, suggesting common behavior for large X-ray flux variation events in AXPs. The Spitzer flux 1E 1048.1-5937 limits are sufficiently deep that we can exclude mid-infrared emission similar to that from the AXP 4U 0142+61, which has been interpreted as arising from a dust disk around the AXP. The optical/near-infrared emission from probably has a magnetospheric origin. The similarity in the flux spectra of 4U 0142+61 and 1E 1048.1-5937 challenges the dust disk model proposed for the latter.Comment: 5 pages, 1 figure, accepted by Ap

What does it mean when we ask the public if they are “confident” in policing? The Trust, Fairness, Presence model of “public confidence”

‘Confidence’ is widely taken to be a crucial measure of the relationship between citizens and public services such as policing. It is acknowledged that confidence is multifaceted and hard to measure, but often discussions are based on one ‘headline’ rating of a single item, for instance: ‘What is your level of confidence in…’. The subsequent focus for research is explaining what might drive ‘confidence’, or what it might predict. We are interested in a more fundamental question: what does it mean when we ask the public if they are ‘confident’ in policing? To answer this, we analyse extensive and detailed survey data specifically designed to measure public confidence, within the jurisdiction of a UK police force – West Midlands Police. We develop then validate a three-part model of confidence as trust, fairness and presence, and find good evidence to support this model across different waves of the survey. This extends existing literature with implications for policy

Elliptic Reciprocity

The paper introduces the notions of an elliptic pair, an elliptic cycle and an elliptic list over a square free positive integer d. These concepts are related to the notions of amicable pairs of primes and aliquot cycles that were introduced by Silverman and Stange. Settling a matter left open by Silverman and Stange it is shown that for d=3 there are elliptic cycles of length 6. For d not equal to 3 the question of the existence of proper elliptic lists of length n over d is reduced to the the theory of prime producing quadratic polynomials. For d=163 a proper elliptic list of length 40 is exhibited. It is shown that for each d there is an upper bound on the length of a proper elliptic list over d. The final section of the paper contains heuristic arguments supporting conjectured asymptotics for the number of elliptic pairs below integer X. Finally, for d congruent to 3 modulo 8 the existence of infinitely many anomalous prime numbers is derived from Bunyakowski's Conjecture for quadratic polynomials.Comment: 17 pages, including one figure and two table

Ethics as an act of listening

Over the past fifty years concerns regarding ethical and human rights abuses arising from biomedical research have led to the establishment of sophisticated processes for ethical oversight of research and to increasing regulation of many aspects of the research endeavour. Research using human tissue collections (tissue banking research) is no exception, with evermore stringent regulations emerging in response to concerns about consent, privacy and commercialisation. These measures are perfectly compatible with central bioethical concerns such as the need to ensure autonomy and the right to control one’s body and personal information, and the need to protect vulnerable research subjects from harm. So why, one might ask, are scientists so resentful of these regulations and so concerned about their potential adverse impact (e.g. Furness 2004)? Does this mean that the scientific community is dangerously insensitive to the public’s mistrust and desire for autonomy? Or are they more aware of public values? It is possible to theorise endlessly about such matters, but at some point it is necessary to carry out empirical research into public attitudes and values. While the ‘empirical turn’ in bioethics has its limitations and is primarily descriptive, rather than normative (Sugarman 2004), as Chandros Hull et al remind us, if bioethics does not accurately reflect community values may impede science and misrepresent the needs of “vulnerable” populations

Polarisation-independent Bragg gratings in ion-exchanged glass channel waveguides

The polarisation dependence of Bragg gratings photowritten in ion-exchanged glass waveguides is characterised for waveguides with different mask-opening widths and burial depths. It is found that polarisation-independent gratings can be written in waveguides with a wide variation in fabrication parameters

An empirical reappraisal of public trust in biobanking research: rethinking restrictive consent requirements

Collections of human tissue removed from patients in the course of medical diagnosis or therapy are believed to be an increasingly important resource for medical research (biobank research). As a result of a number of tissue-related "scandals" and increasing concern about ownership and privacy, the requirements to obtain consent from tissue donors are becoming increasingly stringent. The authors' data show that members of the general public perceive academic biobank researchers and their institutions to be highly trustworthy and do not see the need for recurrent, project-specific consent. They argue, on the basis of their empirical findings, that we should question the trend, at least in some settings, toward ever more stringent consent requirements for the use of tissue in research. They argue that this approach, while perhaps counterintuitive in the current regulatory environment, can be both ethically and legally sound so long as channels of communication are maintained and third-party relationships are tightly controlled

Age and Prostate-Specific Antigen Level Prior to Diagnosis Predict Risk of Death from Prostate Cancer.

A single early prostate-specific antigen (PSA) level has been correlated with a higher likelihood of prostate cancer diagnosis and death in younger men. PSA testing in older men has been considered of limited utility. We evaluated prostate cancer death in relation to age and PSA level immediately prior to prostate cancer diagnosis. Using the Veterans Affairs database, we identified 230,081 men aged 50-89 years diagnosed with prostate cancer and at least one prior PSA test between 1999 and 2009. Prostate cancer-specific death over time was calculated for patients stratified by age group (e.g., 50-59 years, through 80-89 years) and PSA range at diagnosis (10 ranges) using Kaplan-Meier methods. Risk of 10-year prostate cancer mortality across age and PSA was compared using log-rank tests with a Bonferroni adjustment for multiple testing. 10.5% of men diagnosed with prostate cancer died of cancer during the 10-year study period (mean follow-up = 3.7 years). Higher PSA values prior to diagnosis predict a higher risk of death in all age groups (p < 0.0001). Within the same PSA range, older age groups are at increased risk for death from prostate cancer (p < 0.0001). For PSA of 7-10 ng/mL, cancer-specific death, 10 years after diagnosis, increased from 7% for age 50-59 years to 51% for age 80-89 years. Men older than 70 years are more likely to die of prostate cancer at any PSA level than younger men, suggesting prostate cancer remains a significant problem among older men (even those aged 80+) and deserves additional study