Search for Gravitational Waves from Primordial Black Hole Binary Coalescences in the Galactic Halo

We use data from the second science run of the LIGO gravitational-wave detectors to search for the gravitational waves from primordial black hole (PBH) binary coalescence with component masses in the range 0.2--$1.0 M_\odot$. The analysis requires a signal to be found in the data from both LIGO observatories, according to a set of coincidence criteria. No inspiral signals were found. Assuming a spherical halo with core radius 5 kpc extending to 50 kpc containing non-spinning black holes with masses in the range 0.2--$1.0 M_\odot$, we place an observational upper limit on the rate of PBH coalescence of 63 per year per Milky Way halo (MWH) with 90% confidence.Comment: 7 pages, 4 figures, to be submitted to Phys. Rev.

Rapid response petrology for the opening eruptive phase of the 2021 Cumbre Vieja eruption, La Palma, Canary Islands

This is the final version. Available on open access from Volcanica via the DOI in this recordData availability: Full datasets are available at Research Square: https: //assets.researchsquare.com/files/rs-963593/ v1/9f174d00-262e-4f21-b0d2-6825cf131538.pdf?c= 1634295351 (doi: 10.21203/rs.3.rs-963593/v1).How and why magmatic systems reactivate and evolve is a critical question for monitoring and hazard mitigation efforts during initial response and ongoing volcanic crisis management. Here we report the first integrated petrological results and interpretation provided to monitoring authorities during the ongoing eruption of Cumbre Vieja, La Palma, Canary Islands, Spain. The first eruptive products comprised simultaneous Strombolian fountain-fed lava flows and tephra fall from near-continuous eruption plumes. From combined field, petrographic and geochemical analyses conducted in the 10 days following sample collection, we infer low percentage mantle melts with a variably equilibrated multimineralic crystal-cargo and compositional fractionation by winnowing during eruptive processes. Hence ‘rapid response’ petrology can untangle complex magmatic and volcanic processes for this eruption, which combined with further study and methodological improvement can increasingly assist in active decision making

Vitamin D assays:past and present debates, difficulties, and developments

Clinical interest in Vitamin D and its purported roles not only in calcium and bone metabolism but in several other medical conditions (diabetes, cardiovascular disease, multiple sclerosis, cancer, psychiatric disorders, neuro-muscular disease) has led to a surge in laboratory requests for 25 hydroxy vitamin D and 1,25 dihydroxy vitamin D measurement. Circulating 25 hydroxy vitamin D concentration is routinely used as the best indicator of vitamin D status, but measurement of other metabolites, especially the physiologically active 1,25 dihyroxy vitamin D, are of clinical value. Over the last 40 years the development of assays for vitamin D and its metabolites from early competitive binding assays through to immunoassay and liquid chromatography aligned to mass spectrometry have demonstrated various analytical challenges, the advantages and disadvantages of each method are constantly changing with new technological developments. Immunoassay remains the predominant mode of measurement for 25-hydroxy vitamin D although problems with equimolar recovery of the D2 and D3 metabolites remain an issue. Standardisation of all assays has been improved but not resolved with the currently available reference materials as evidenced by the international vitamin D external quality assurance scheme, DEQAS. The choice of method for each laboratory remains a balance mainly between turn around time, convenience, cost and the specificity and accuracy of the information obtained. With increasing discussion and clinical interest surrounding other vitamin D metabolites the vitamin D assay debate is set to continue

Why Do Managers Leave Their Organization? : Investigating the Role of Ethical Organizational Culture in Managerial Turnover

The aim of the present longitudinal study was to quantitatively examine whether an ethical organizational culture predicts turnover among managers. To complement the quantitative results, a further important aim was to examine the self-reported reasons behind manager turnover, and the associations of ethical organizational culture with these reasons. The participants were Finnish managers working in technical and commercial fields. Logistic regression analyses indicated that, of the eight virtues investigated, congruency of supervisors, congruency of senior management, discussability, and sanctionability were negatively related to manager turnover. The results also revealed that the turnover group is not homogeneous, and that there are several different reasons for leaving. The reasons given for turnover were grouped into five different categories: (1) lay-off, (2) career challenges, (3) dissatisfaction with the job or organization, (4) organizational change, and (5) decreased well-being/motivation. ANCOVA analyses showed that those managers who stayed in their organization perceived their ethical culture to be stronger than those in turnover groups, and especially compared to groups 3 and 5. The results acquired through different methods complemented and confirmed each other, showing that by nurturing ethical virtues an organization can decrease job changes and encourage managers and supervisors to want to remain in their organization.peerReviewe

First all-sky upper limits from LIGO on the strength of periodic gravitational waves using the Hough transform

We perform a wide parameter-space search for continuous gravitational waves over the whole sky and over a large range of values of the frequency and the first spin-down parameter. Our search method is based on the Hough transform, which is a semicoherent, computationally efficient, and robust pattern recognition technique. We apply this technique to data from the second science run of the LIGO detectors and our final results are all-sky upper limits on the strength of gravitational waves emitted by unknown isolated spinning neutron stars on a set of narrow frequency bands in the range 200 400 Hz. The best upper limit on the gravitational-wave strain amplitude that we obtain in this frequency range is 4.43×10-23