A class of nonlinear functions and the convergence of Gauss-Seidel and Newton-Gauss-Seidel iterations

Class on nonlinear functions and convergence of Gauss-Seidel and Newton-Gauss-Seidel iteration

A review of bovine Johne's disease control activities in 6 endemically infected countries

Mycobacterium avium subspecies paratuberculosis (MAP) is endemic in the bovine populations of many countries and can cause a significant reduction in animal welfare and production efficiency making control desirable. Effective control has proved very difficult to achieve despite multiple regionally coordinated programmes being in existence since the 1920s. The international community increasingly recognises the value in learning from the collective experiences of existing programmes to improve the effectiveness of control. The aim of this review is to outline key aspects of bovine Johne's disease control activities across 6 endemically infected countries to facilitate comparison of current international practice. The background, control activities and monitoring components of programmes in Australia, Canada, Denmark, the Netherlands, the United Kingdom and the United States of America were individually reviewed. Factual accuracy of each review was checked by individuals involved in the respective programmes before the reviews were condensed and combined into a single document presented here, with the complete reviews of each programme available as supplementary material. There was considerable heterogeneity in key aspects of control activity design including goals, responses to declining participation, herd classification, recommended control measures and associated test requirements. The data presented will be of interest to organisations that are involved in developing new or existing regionally coordinated BJD control activities

Knowledge, attitudes and practices of medical researchers toward authorship in scientific journals

Background: The knowledge, attitudes and practices of scientific authorship vary across different regions. We conducted this study to understand this variation among medical researchers in India.Methods: An anonymous web-based researcher-survey invited all faculty, researchers and PhD students at Pacific institute of Medical sciences, Udaipur, India. The study design and the questionnaire were approved by the institutional ethics committee.  Basic information on study was given to obtain consent for participation. The 30 questions on authorship experience and related issues were based on the statements in International Committee of Medical Journal Editors (ICMJE) and other national and international recommendations on authorship. Participants reported their authorship experiences and answered multiple choice questionnaires.Results: The response rate was 36.36% among the participants, who were post-graduate with up to 10 years of research experience. About 62.5% had not been appropriately acknowledged as authors at some point during their career. Contributors (authorship) and ethical peer review is perceived as the key principle of research integrity. Though, single authorship was regarded as more significant, interdisciplinary management of diseases increases number of co-authors. A platform to challenge authorship, declaration of contribution in authorship and shared responsibility of co-authors in case of fraudulent publication was majority opinion.Conclusions: Almost 50 of the participant medical researchers had knowledge of formal authorship requirements. Majority agreed with the criteria would help in decreasing the authorship dispute in the medical research. There is need for awareness and continuous education on these criteria

Detection of the Gravitational Lens Magnifying a Type Ia Supernova

Objects of known brightness, like Type Ia supernovae (SNIa), can be used to measure distances. If a massive object warps spacetime to form multiple images of a background SNIa, a direct test of cosmic expansion is also possible. However, these lensing events must first be distinguished from other rare phenomena. Recently, a supernova was found to shine much brighter than normal for its distance, which resulted in a debate: was it a new type of superluminous supernova or a normal SNIa magnified by a hidden gravitational lens? Here we report that a spectrum obtained after the supernova faded away shows the presence of a foreground galaxy--the first found to strongly magnify a SNIa. We discuss how more lensed SNIa may be found than previously predicted.Comment: 32 pages, 10 figures. Accepted for publication in Scienc