Narrowband Searches for Continuous and Long-duration Transient Gravitational Waves from Known Pulsars in the LIGO-Virgo Third Observing Run

Isolated neutron stars that are asymmetric with respect to their spin axis are possible sources of detectable continuous gravitational waves. This paper presents a fully coherent search for such signals from eighteen pulsars in data from LIGO and Virgo's third observing run (O3). For known pulsars, efficient and sensitive matched-filter searches can be carried out if one assumes the gravitational radiation is phase-locked to the electromagnetic emission. In the search presented here, we relax this assumption and allow both the frequency and the time derivative of the frequency of the gravitational waves to vary in a small range around those inferred from electromagnetic observations. We find no evidence for continuous gravitational waves, and set upper limits on the strain amplitude for each target. These limits are more constraining for seven of the targets than the spin-down limit defined by ascribing all rotational energy loss to gravitational radiation. In an additional search, we look in O3 data for long-duration (hours-months) transient gravitational waves in the aftermath of pulsar glitches for six targets with a total of nine glitches. We report two marginal outliers from this search, but find no clear evidence for such emission either. The resulting duration-dependent strain upper limits do not surpass indirect energy constraints for any of these targets. © 2022. The Author(s). Published by the American Astronomical Society

Association between anthropometric measures of obesity and cardiovascular risk markers in a self-selected group of indigenous Australians

Background Indigenous Australians have a high prevalence of obesity and an unacceptably high rate of cardiovascular disease. Methods We conducted a cross-sectional analysis of 93 high-risk indigenous Australians to assess how strongly three anthropometric measures correlated with known cardiovascular risk factors. Results Both waist circumference and body mass index were strongly associated with important risk factors. The waist: hip ratio was less useful. Waist circumference was the only measure that significantly correlated with the urine albumin creatinine ratio (p=0.14; P=0.04). Conclusion Measuring the waist circumference is a cheap, effective way of monitoring cardiovascular risk

The Local production of knowledge: disease labels, identities and category entitlements in ME support group talk

This article uses discursive psychology to analyse how knowledge claims and entitlements are locally produced in an ME support group meeting and a research interview. The article demonstrates how ‘expertise’ and ‘experience’ associated with lay and professional membership are locally constituted in the activity of reasoning, arguing and claims making. The analysis shows how expertise and experiential claims are constructed, disclaimed, warranted and undermined in relationship to membership categorization and entitlements to knowledge that are co-constructed in the process of a discussion about disease labels and the nature of the illness as physical or psychological. In a discussion about the definition of contested disease categories, what is ‘at stake’ for the group members is the entitlement to speak from experience as members who can ‘know’ their own minds

A detailed chemical kinetic reaction mechanism for oxidation of four small alkyl esters in laminar premixed flames

Westbrook CK, Pitz WJ, Westmoreland PR, et al. A detailed chemical kinetic reaction mechanism for oxidation of four small alkyl esters in laminar premixed flames. PROCEEDINGS OF THE COMBUSTION INSTITUTE. 2009;32(1):221-228.A detailed chemical kinetic reaction mechanism has been developed for a group of four small alkyl ester fuels, consisting of methyl formate, methyl acetate, ethyl formate, and ethyl acetate. This mechanism is validated by comparisons between computed results and recently measured intermediate species mole fractions in fuel-rich, low-pressure, premixed laminar flames. The model development employs a principle of similarity of functional groups in constraining the H atom abstraction and unimolecular decomposition reactions for each of these fuels. As a result, the reaction mechanism and formalism for mechanism development are suitable for extension to larger oxygenated hydrocarbon fuels, together with an improved kinetic understanding of the structure and chemical kinetics of alkyl ester fuels that can be extended to biodiesel fuels. Variations in concentrations of intermediate species levels in these flames are traced to differences in the molecular structure of the fuel molecules. (C) 2009 The Combustion Institute. Published by Elsevier Inc. All rights reserved

Biogeography of bacterioplankton in the tropical seawaters of Singapore

10.1111/1574-6941.12057FEMS Microbiology Ecology842259-269FMEC