An Analysis Of γp→pπ+π−\gamma p \to p \pi^+ \pi^- Using The CLAS Detector

Two charged pion final states are studied for GeV photons incident on protons. The data come from Thomas Jefferson National Accelerator Facility using the CLAS detector. A tagged photon beam of 0.5-2.4 GeV/c was produced through bremsstrahlung radiation and was incident on a liquid H2 target. This analysis looks at the reaction $\gamma p \to p \pi^+ \pi^-$ using a partial wave analyis to identify intermediate baryon resonances. Total cross section is compared to previous experiments and preliminary differential cross sections for intermediate baryon resonance quantum numbers are shown.Comment: 4 pages, 4 figure

Of all the Gin Joints: Harris and the Supreme Court’s Reluctant Jurisprudence on Partisanship in Redistricting

As interpreted by the Supreme Court, the Fourteenth Amendment’s Equal Protection Clause protects the voting power of citizens. Thus, drawing state legislative districts resulting in dilution of citizens’ voting power may violate the Constitution. However, the question of what factors a state may take into account when redistricting has not been settled. In the upcoming Supreme Court case of Harris v. Arizona Independent Redistricting Commission, the Court faces the question of whether partisan makeup of the population and whether an attempt by a state to obtain federal preclearance for redistricting are valid factors a state can take into account when redrawing state legislative districts. This Commentary argues that the Court should pass on the question of partisanship as a factor but hold that an attempt to obtain federal preclearance is permissible grounds for deviating from the one-person, one-vote standard

Work hard, party harder:drug use and sexual behaviour in young British casual workers in Ibiza, Spain

Background: Every summer, young people flock to nightlife-focused holiday resorts around the world to find casual work. Despite being exposed to hedonistic environments, often for several months, little is known about their substance use, sexual activity and health service needs over this extended amount of time abroad. Methods: A short anonymous questionnaire examining alcohol and drug use, sexual behaviour and use of health services was administered to young British casual workers aged 16–35 in San Antonio, Ibiza (n = 171). Results: 97.7% of casual workers used alcohol in Ibiza, and the majority (85.3%) used drugs. Almost half (43.5%) of all participants used a drug in Ibiza that they had never used in the UK. Most casual workers arrived in Ibiza without a partner or spouse (86.5%). Of these, 86.9% had sex during their stay and 50.0% had unprotected sex; often while under the influence of alcohol. Only 14.3% of those having unprotected sex with a new partner sought a sexual health check-up in Ibiza, although 84.1% intended to do this on their return to the UK. Conclusion: Substance use and sexual risk taking is widespread among young British casual workers in Ibiza. Such international nightlife resorts represent key settings for substance-related health and social problems, and for the international spread of sexually transmitted infections. Addressing the health needs of casual workers and the environments that permit and promote their excessive behaviour requires collaboration between authorities in home and destination countries and the tourism industry

Investigation into the effect of uncertainty of CPT-based soil type estimation on the accuracy of CPT-based pile bearing capacity analysis

Cone Penetration Test (CPT or CPTu) is commonly used for estimating soil types and also for the geotechnical design of pile foundation. However, the level of agreement between the CPT-based soil types and the traditional identification of soil types based on samples may vary significantly; and it is not clearly understood if this variation has any sort of relationship with the CPT-based pile design. To investigate into this area, a ground investigation trial was carried out at six different locations as part of a highway scheme in East of England. At each location the trial comprised one CPTu adjacent to one borehole (BH) with conventional sampling and laboratory testing. The soil types were estimated from the CPTs and compared with the boreholes findings, and the levels of correlation between them were established. Similarly, the ultimate bearing capacity of a typical bored pile based on the CPTs and on the BHs were calculated and compared. Despite the variable level of disagreement of the CPT-based soil type estimation with the BHs findings, the pile capacity based on CPT data was found to be generally consistent with the values obtained from the traditional BHs-based pile design

Evaluation of the London City Strategy ESOL Pilot: final report (Research Report No 744)

A report of research carried out by Institute for Employment Studies on behalf of the Department for Work and Pensions This report presents findings from research carried out by the Institute for Employment Studies as part of the evaluation of the London City Strategy Pathfinder English for Speakers of Other Languages (ESOL) Pilot. The research was commissioned by the Department for Work and Pensions (DWP). The two-year ESOL Pilot was designed to demonstrate how work-focused ESOL training provision can support access to sustainable employment for people who speak English as an additional language: the main target group was parents with ESOL needs who were in receipt of benefits or tax credits. The ESOL Pilot was located within the London City Strategy Pathfinder (CSP) areas of East and Southeast London and West London, which face typical inner-city problems of social deprivation and worklessness. They are also areas with large, well-established Black and Minority Ethnic (BME) communities with disproportionately high rates of unemployment. One of the main aims of the ESOL Pilot was, therefore, to address some of the key barriers to employment faced by members of these communities. This study took a primarily qualitative approach, consisting of an inception phase, followed by two waves of qualitative interviews with participants, provider staff and other stakeholders. In total, there were 175 interviews conducted during the course of the research: 104 with participants, 61 with providers and their partners and ten with stakeholders

A Value-Sensitive Design Approach to Intelligent Agents

This chapter proposed a novel design methodology called Value-Sensitive Design and its potential application to the field of artificial intelligence research and design. It discusses the imperatives in adopting a design philosophy that embeds values into the design of artificial agents at the early stages of AI development. Because of the high risk stakes in the unmitigated design of artificial agents, this chapter proposes that even though VSD may turn out to be a less-than-optimal design methodology, it currently provides a framework that has the potential to embed stakeholder values and incorporate current design methods. The reader should begin to take away the importance of a proactive design approach to intelligent agents

Wave propagation in a fractional viscoelastic Andrade medium: diffusive approximation and numerical modeling

This study focuses on the numerical modeling of wave propagation in fractionally-dissipative media. These viscoelastic models are such that the attenuation is frequency dependent and follows a power law with non-integer exponent. As a prototypical example, the Andrade model is chosen for its simplicity and its satisfactory fits of experimental flow laws in rocks and metals. The corresponding constitutive equation features a fractional derivative in time, a non-local term that can be expressed as a convolution product which direct implementation bears substantial memory cost. To circumvent this limitation, a diffusive representation approach is deployed, replacing the convolution product by an integral of a function satisfying a local time-domain ordinary differential equation. An associated quadrature formula yields a local-in-time system of partial differential equations, which is then proven to be well-posed. The properties of the resulting model are also compared to those of the original Andrade model. The quadrature scheme associated with the diffusive approximation, and constructed either from a classical polynomial approach or from a constrained optimization method, is investigated to finally highlight the benefits of using the latter approach. Wave propagation simulations in homogeneous domains are performed within a split formulation framework that yields an optimal stability condition and which features a joint fourth-order time-marching scheme coupled with an exact integration step. A set of numerical experiments is presented to assess the efficiency of the diffusive approximation method for such wave propagation problems.Comment: submitted to Wave Motio

Gold in Devono-Carboniferous red beds of northern Britain

We are grateful to D. Craw and an anonymous reviewer for comments that helped to clarify the paper. Research was funded by NERC grants NE/L001764/1 and NE/M010953/1.Peer reviewedPublisher PD