Cylinders with Square Cross Section: Paths to Turbulence with Various Angles of Incidence

The path to turbulence in the wake of cylinders with square crosssection is investigated by means of direct numerical simulation, employing a two-dimensional spectral element method and Floquet linear stability analysis. The critical Reynolds number for the onset of the three-dimensional instability modes A, B, C and QP are reported for cylinder incidence angles between 0° and 45°. The Strouhal—Reynolds number relationship, and lift and drag coefficients are also investigated for these incidence angles. Reynolds numbers (based on the side length of the square) up to Re=300 are considered, and a significant variation in bifurcation scenarios are observed for the various incidence angles. At Reynolds numbers greater than Re ≈ 225 for an incidence angle of 45°, a previously unreported asymmetry is detected in the von Kármán vortex street. The cause of this asymmetry is investigated as it presents a possible alternative path to turbulence to that reported in the wakes of other bluff bodies

Evaluating Social and Spatial Inequalities of Large Scale Rapid Lateral Flow SARS-CoV-2 Antigen Testing in COVID-19 Management: An Observational Study of Liverpool, UK (November 2020 to January 2021)

Background: The aim of the study is to explore social and spatial inequalities in uptake and case-detection of rapid lateral flow SARS-CoV-2 antigen tests (LFTs) offered to people without symptoms of COVID-19.Methods: Linked pseudonymised records for asymptomatic residents in Liverpool (UK) who received a LFT for COVID-19 between 6th November 2020 to 31st January 2021 were accessed using the Combined Intelligence for Population Health Action (CIPHA) data resource. Bayesian Hierarchical Poisson Besag, York, and Mollié models were used to estimate ecological associations for uptake and positivity of testing.Findings: 214 525 residents (43%) received a LFT identifying 5557 individuals as positive cases of COVID-19 (1.3%). Uptake was highest in November when there was military assistance. High uptake was observed again in the week preceding Christmas and was sustained into a national lockdown. Overall uptake and repeat testing were lower among males (e.g. 40% uptake over the whole period), Black Asian and other Minority Ethnic groups (e.g. 27% uptake for ‘Mixed’ ethnicity) and in the most deprived areas (e.g. 32% uptake in most deprived areas). These population groups were also more likely to have received positive tests for COVID-19. Models demonstrated that uptake and repeat testing were lower in areas of higher deprivation, areas located further from test sites and areas containing populations less confident in the using Internet technologies. Positive tests were spatially clustered in deprived areas.Interpretation: Large-scale voluntary asymptomatic community testing saw social, ethnic, and spatial inequalities in an ‘inverse care’ pattern, but with an added digital exclusion factor. COVID-19 testing and support to isolate need to be more accessible to the vulnerable communities most impacted by the pandemic, including non-digital means of access.Funding: Department of Health and Social Care (UK), National Institute for Health Research and Economic and Social Research Council).Conflict of Interest: None declared.Ethical Approval: The University of Liverpool has provided secondary data analysis as part of a national service evaluation with data collected by Department of Health and Social Care (Sponsor) for quality assurance of Innova lateral flow tests in a public health service intervention. There was no research commissioned by Department of Health and Social Care on this aspect of the Liverpool pilot of asymptomatic, community testing. As such, research ethics approval was not sought by the Department of Health and Social Care. Some aspects of the evaluation requiring fieldwork and primary data collection by the University of Liverpool were subject to ethical approval, which was confirmed prior to the commencement of activities by the University of Liverpool’s Research Ethics Committee. The provision of secondary data analysis and interpretation did not require further ethical approval. Cheshire & Merseyside Health & Care Partnership Combined Intelligence for Population HealthAction (CIPHA) Data Access Committee approved access to the data and analysis contained in the study. MAST/SMART was defined as ‘an emergency public health intervention during an extraordinary event’ which were subject to the legal and ethical provisions of a health protection activity and COVID-19 specifically. The secondary analysis of data provided in a health protection activity is not classified as research, and so does not require research ethics committee review (see http://www.hradecisiontools.org.uk/research/docs/DefiningResearchTable_Oct2017-1.pdf)

Introductory programming: a systematic literature review

As computing becomes a mainstream discipline embedded in the school curriculum and acts as an enabler for an increasing range of academic disciplines in higher education, the literature on introductory programming is growing. Although there have been several reviews that focus on specific aspects of introductory programming, there has been no broad overview of the literature exploring recent trends across the breadth of introductory programming. This paper is the report of an ITiCSE working group that conducted a systematic review in order to gain an overview of the introductory programming literature. Partitioning the literature into papers addressing the student, teaching, the curriculum, and assessment, we explore trends, highlight advances in knowledge over the past 15 years, and indicate possible directions for future research

Die rechtliche Regelung des Instituts der kostenlosen Rechtshilfe in der Republik Kroatien mit besonderer Berücksichtigung der gesetzlichen Regelungen in den postjugoslawischen Staaten

“Pravo i pravdu nećemo nikome prodati, uskratiti ili odgoditi.” 40. paragraf Velike povelje sloboda Pravo na pristup pravosuđu (access to justice) jedno je od temeljnih ljudskih prava. Ostvarivanje toga prava uvelike ovisi o dostupnosti pravne pomoći svim građanima bez obzira na njihov socioekonomski status. Stoga je postojanje učinkovitog sustava besplatne pravne pomoći u svakoj zemlji jedan od temeljnih jamaca ostvarivanja ljudskih prava u svakodnevnom životu. U radu se razmatra razvoj i uređenje instituta besplatne pravne pomoći u Republici Hrvatskoj te u ostalim postjugoslavenskim državama s ciljem regionalnog prikaza njegova uređenja.«To no one will we sell, to no one will we refuse or delay, right or justice» 40th paragraph of the Magna Charta The paper considers the development and regulation of the institute of legal aid in the Republic of Croatia and in the other post-Yugoslav states with the aim of providing a regional outline of their regulation. In recent years legislators in the post-Yugoslav states have been increasingly involved in the regulation of legal aid and, in order to develop modern legal systems, they adopted laws aimed at ensuring and protecting the right to legal aid. The normative activities for regulating legal aid began with the constitutional guarantee for such aid, and were made effective by the provisions of the criminal codes and the civil procedure acts. Later, under the influence of the acquis communautaire of the modern European states they were to be included in the provisions of separate laws of the post-Yugoslav states. This shows that there was an evolution in the development of the right to legal aid, not only as the right to such aid in the form of good will and charity of the state, but also as one of the fundamental human rights guaranteed by constitutional and legal norms.“Niemandem werden wir Recht oder Gerechtigkeit verkaufen, verweigern oder verzögern.“ Magna Carta, § 40 In dieser Arbeit werden die Entwicklung und Regelung des Instituts der kostenlosen Rechtshilfe in der Republik Kroatien und in den anderen postjugoslawischen Staaten erörtert, wodurch seine Regelung in der Region dargestellt werden soll. In den letzten Jahren ist die Regelung des Anspruchs auf kostenlose Rechtshilfe zu einer wichtigen Aufgabe für die Gesetzgeber in den postjugoslawischen Staaten geworden, die zwecks Aufbau moderner Rechtsordnungen Gesetze verabschiedeten, deren Gegenstand die Wahrnehmung und der Schutz des Rechts auf kostenlose Rechtshilfe ist. Die normative Aktivität zur Einrichtung der kostenlosen Rechtshilfe begann mit der Verfassungsgarantie des Rechtsanspruches auf kostenlose Rechtshilfe, die in den Bestimmungen der Straf- und der Zivilprozessordnung ihren konkreten Niederschlag fanden, um sich unter dem Einfluss der Trends in der Gesetzgebung der modernen europäischen Staaten zu Bestimmungen in Sondergesetzen der postjugoslawischen Staaten zu verwandeln. Dies belegt eine Evolution in der Entwicklung des Rechtsanspruchs auf kostenlose Rechtshilfe als nicht allein des Anspruchs auf Hilfe in Form einer wohltäterischen Geste von staatlichem guten Willen, sondern als eines Grundrechts, das durch Verfassungs- und Gesetzesnormen garantiert wird

Java meets Teletubbies: An interaction between program codes and physical props

Teaching students a computer language is not just about teaching them the syntax of a language. It is the underlying concepts behind the language features that are important In out School, Java is offered as an introductory subject and is becoming the official language for all our I.T. students. Due to the diversity of students in the first year, it is a challenge to bring all these students to the same level of understanding in some of the abstract theories. It is especially hard when some of the issues are not popular in the physical world. Having said that, our understanding of the environment comes from our interaction with the physical objects around us. We are accustomed to use these concrete items to help comprehend and develop more advanced knowledge. Hence, it is hypothesed that the use of physical props in teaching programming language is beneficial to students in constructing mental models of the abstract programming concepts. The mental model allows them to simulate and to experiment relevant issues without the actual coding. An experiment was designed to interplay the program codes in both the real world and the virtual environment This approach proved to be very effective to facilitate students in building mental models during the learning process

Curiosity Conversation - Living by the Land

In this episode, Dr Euridice Honorio speaks with Eilidh and Matt about making sustainable choices and having an impact, especially around peatland areas

Curiosity Conversation - Living by the Land

In this episode, Dr Euridice Honorio speaks with Eilidh and Matt about making sustainable choices and having an impact, especially around peatland areas