Multifrequency radio observations of SNR J0536-6735 (N 59B) with associated pulsar

We present a study of new Australian Telescope Compact Array (ATCA) observations of supernova remnant, SNR J0536-6735. This remnant appears to follow a shell morphology with a diameter of D=36x29 pc (with 1 pc uncertainty in each direction). There is an embedded Hii region on the northern limb of the remnant which made various analysis and measurements (such as flux density, spectral index and polarisation) difficult. The radio-continuum emission followed the same structure as the optical emission, allowing for extent and flux density estimates at 20 cm. We estimate a surface brightness for the SNR at 1 GHz of 2.55x10^-21 W m^-2 Hz^-1 sr^-1. Also, we detect a distinctive radio-continuum point source which confirms the previous suggestion of this remnant being associated with a pulsar wind nebulae (PWN). The tail of this remnant isn't seen in the radio-continuum images and is only seen in the optical and X-ray images.Comment: 10 pages 4 figures, accepted for publication in SA

Organisational factors and academic research agendas: an analysis of academics in the social sciences

The demands for academic research placed on contemporary universities are closely related to the levels of innovative research they are expected to produce. Concurrently, both governments and university management strive to make the production of academic research more cost-efficient and have implemented measures to ensure this. Top-down policies influenced by the concepts of new public management and managerialism have been introduced, pushing for competitiveness and increased performativity in academic research setups. These policies and guidelines have been criticised by academics as having eroded collegiality and autonomy, which are considered necessary to achieve quality research. The focus of this study is on the social sciences and aligns with this critique, demonstrating that autonomy and collegiality are the key organisational features fostering multidisciplinary, collaborative and riskier research agendas that lead to breakthroughs. Academics with high levels of organisational commitment are more likely to create research agendas that assume more conservative, discipline-bound and risk-averse traits, with less potential to achieve the intended innovative research outcomes.info:eu-repo/semantics/acceptedVersio

The research agenda setting of higher education researchers

Research agenda setting is a critical dimension in the creation of knowledge since it represents the starting point of a process that embeds individual researchers’ (and the communities that they identify themselves with) interest for shedding light on topical unknowns, intrinsic and extrinsic factors underpinning that motivation, and the ambition and scope of what a research endeavor can bring. This article aims to better understand the setting of individual research agendas in the field of higher education. It does so by means of a recently developed framework on research agenda setting that uses cluster analysis and linear modeling. The findings identify two main clusters defining individual research agenda setting—cohesive and trailblazing—each with a different set of determining characteristics. Further analysis by cross-validation through means of sub-sampling shows that these clusters are consistent for both new and established researchers, and for frequent and “part-time” contributors to the field of higher education. Implications for the field of higher education research are discussed, including the relevance that each research agendas cluster has for the advancement of knowledge in the field.info:eu-repo/semantics/acceptedVersio

The Multi-Dimensional Research Agendas Inventory – Revised (MDRAI-R): factors shaping researchers’ research agendas in all fields of knowledge

This study creates a novel inventory that characterizes factors influencing the research agendas of researchers in all fields of knowledge: the Multi-dimensional Research Agendas Inventory-Revised (MDRAI-R). The MDRAI-R optimizes an initial inventory designed for the social sciences (the MDRAI) by reducing the number of items per dimension, improving the inventory’s psychometric properties, and including new dimensions (“Academia Driven” and “Society Driven”) that reflect the greater influence of social and organizational structures on knowledge production and demands for research impact. This inventory enhances our ability to measure research activities at a time when researchers’ choices matter more than ever, and it will be of interest to researchers, policy makers, research funding agencies, and university and research organizations.info:eu-repo/semantics/publishedVersio

The association between researchers’ conceptions of research and their strategic research agendas

In studies of the research process, the association between how researchers conceptualize research and their strategic research agendas has been largely overlooked. This study aims to address this gap. This study analyzes this relationship using a dataset of more than 8,500 researchers across all scientific fields and the globe. It studies the associations between the dimensions of two inventories: the Conceptions of Research Inventory (CoRI) and the Multi-Dimensional Research Agenda Inventory - Revised (MDRAI-R). The findings show a relatively strong association between researchers' conceptions of research and their research agendas. While all conceptions of research are positively related to scientific ambition, the findings are mixed regarding how the dimensions of the two inventories relate to one another, which is significant for those seeking to understand the knowledge production process better. The study relies on self-reported data, which always carries a risk of response bias. The findings provide a greater understanding of the inner workings of knowledge processes and indicate that the two inventories, whether used individually or in combination, may provide complementary analytical perspectives to research performance indicators. They may thus offer important insights for managers of research environments regarding how to assess the research culture, beliefs, and conceptualizations of individual researchers and research teams when designing strategies to promote specific institutional research focuses and strategies. To the best of the authors' knowledge, this is the first study to associate research agendas and conceptions of research. It is based on a large sample of researchers working worldwide and in all fields of knowledge, which ensures that the findings have a reasonable degree of generalizability to the global population of researchers.info:eu-repo/semantics/publishedVersio

Academic inbreeding and choice of strategic research approaches

Academic inbreeding is a phenomenon that has been studied mostly from the standpoint of its association with research productivity. The focus has been on knowledge creation outputs and outcomes, while little to no attention has been given to the association of academic inbreeding with knowledge creation strategies and processes in academia. This article focusses on the latter, confirming that academic inbreeding is detrimental to the research aspirations, innovativeness, risk‐taking, and multidisciplinarity engagement of academics' research agendas, as predicted by literature. These findings, based on a sample of more than 7000 academics from all fields of knowledge, working in more than 140 countries, do not find a greater influence of the PhD mentor on the strategic research agendas of homegrown academics as the literature would expect. The findings also underline critical differences between homegrown academics and silver‐corded academics, stressing that the latter category of academics should not be considered as part of the academic inbreeding process (which concept rests on immobility), but rather understood as a category of limited institutional mobility that deserves further study.info:eu-repo/semantics/acceptedVersio

A Complex Case of Cholestasis in a Patient with ABCB4 and ABCB11 Mutations

The low-phospholipid-associated cholelithiasis (LPAC) syndrome is a form of symptomatic cholelithiasis occurring in young adults, characterized by recurrence of symptoms after cholecystectomy and presence of hepatolithiasis. The case refers to a healthy 39-year-old Caucasian male who presented with abdominal pain and jaundice. His blood tests showed conjugated hyperbilirubinemia and elevated liver enzymes (total bilirubin 6.65 mg/dL, γ-glutamyltransferase 699 IU/L) and abdominal computed tomography revealed dilation of common bile duct and left intrahepatic ducts. Magnetic resonance cholangiopancreatography identified choledocholithiasis, retrieved by endoscopic retrograde cholangiopancreatography, after which there was a worsening of jaundice (total bilirubin 23 mg/dL), which persisted for several weeks, possibly due to ciprofloxacin toxicity. After an extensive workup including liver biopsy, the identification of two foci of hepatolithiasis on reevaluation abdominal ultrasound raised the hypothesis of LPAC syndrome and the patient was started on ursodeoxycholic acid, with remarkable improvement. Genetic testing identified the mutation c.1954A>G (p.Arg652Gly) in ABCB4 gene (homozygous) and c.1331T>C (p.Val444Ala) in ABCB11 gene (heterozygous). In conclusion, we describe the unique case of an adult male with choledocholithiasis, hepatolithiasis, and persistent conjugated hyperbilirubinemia after retrieval of stones, fulfilling the criteria for LPAC syndrome and with possible superimposed drug-induced liver injury, in whom ABCB4 and ABCB11 mutations were found, both of which had not been previously described in association with LPAC.info:eu-repo/semantics/publishedVersio

The Strongest 100 Point Radio Sources in the LMC at 1.4 GHz

We present the 100 strongest 1.4 GHz point sources from a new mosaic image in the direction of the Large Magellanic Cloud (LMC). The observations making up the mosaic were made over a ten year period and were combined with Parkes single dish data at 1.4 GHz to complete the image for short spacing. An initial list of co-identifications within 10" at 0.843, 4.8 and 8.6 GHz consisted of 2682 sources. Elimination of extended objects and artifact noise allowed the creation of a refined list containing 1988 point sources. Most of these are presumed to be background objects seen through the LMC; a small portion may represent compact H II regions, young SNRs and radio planetary nebulae. For the 1988 point sources we find a preliminary average spectral index of -0.53 and present a 1.4 GHz image showing source location in the direction of the LMC.Comment: 8 pages, 2 figure

Heun and Mathieu functions as solutions of the Dirac equation

We give examples of where the Heun function exists as solutions of wave equations encountered in general relativity. While the Dirac equation written in the background of Nutku helicoid metric yields Mathieu functions as its solutions in four spacetime dimensions, the trivial generalization to five dimensions results in the double confluent Heun function. We reduce this solution to the Mathieu function with some transformations. We must apply Atiyah-Patodi-Singer spectral boundary conditions to this system since the metric has a singularity at the origin.Comment: 5 pages, Prepared for the Spanish Relativity Meeting (ERE 2007), Tenerife, Spain, 10-14 Sep 200