Minimally Allowed Neutrinoless Double Beta Decay Rates From Approximate Flavor Symmetries

Neutrinoless double beta decay ($\beta\beta0\nu$) is among the only realistic probes of Majorana neutrinos. In the standard scenario, dominated by light neutrino exchange, the process amplitude is proportional to $m_{ee}$, the $e-e$ element of the Majorana mass matrix. Naively, current data allows for vanishing $m_{ee}$, but this should be protected by an appropriate flavor symmetry. All such symmetries lead to mass matrices inconsistent with oscillation phenomenology. I perform a spurion analysis to break all possible Abelian symmetries that guarantee vanishing $\beta\beta0\nu$ rates and search for minimally allowed values. I survey 230 broken structures to yield $m_{ee}$ values and current phenomenological constraints under a variety of scenarios. This analysis also extracts predictions for both neutrino oscillation parameters and kinematic quantities. Assuming reasonable tuning levels, I find that $m_{ee}>4\times 10^{-6}$ eV at 99% confidence. Bounds below this value might indicate the Dirac neutrino nature or the existence of new light (eV-MeV scale) degrees of freedom that can potentially be probed elsewhere.Comment: 19 Pages, 4 .eps Figures, 3 Table

Critical health literacy: conceptualization and settings-based development

Background Health literacy is conceptualized as a continuum of social practices spanning functional, interactive and critical domains. Critical health literacy enables individuals and communities to reflect on the wider health determinants and engage in social and political processes towards health equity. This project introduces the Oxford Bibliographies (OB) entry and illustrates through an empirical case study of critical health literacy in a community-based setting. Methods The OB entry provides a literature review of critical health literacy conceptualization, measurement and interventions. An institutional ethnography of critical health literacy in libraries, models a settings-based approach to critical health literacy development in children. Results Barriers to critical health literacy development include the lack of validated instruments and evaluation of interventions. Common settings for development with children are schools, but institutional settings face challenges in developing the political action element of critical health literacy. There is a need to move beyond single settings to consider multiple settings working in partnership where children can learn, live, and play. A coordinated supersetting approach leverages the strengths of different settings to promote critical health literacy. A model proposes four antecedents to a supersetting in which sub-settings collectively support (1) a determinants-based perspective, (2) open access to information and resources, (3) involvement of community stakeholders and (4) informed action on health. Conclusions Although conceptualized over two decades ago, it is only recently that research on critical health literacy has normalized the consolidation of both its cognitive and social dimensions into a joint strategy of critical thinking and empowerment. A supersetting approach can combine community-based and school-based support to embed critical health literacy development opportunities early in the life course

Cold Flow Determination of the Internal Flow Environment Around the Submerged TVC Nozzle for the Space Shuttle SRM

A series of subscale cold flow tests was performed to quantify the gas flow characteristics at the aft end of the Space Shuttle Solid Rocket Motor. This information was used to support the analyses of the redesigned nozzle/case joint. A portion of the thermal loads at the joint are due to the circumferential velocities and pressure gradients caused primarily by the gimbaling of the submerged nose TVC nozzle. When the nozzle centerline is vectored with respect to the motor centerline, asymmetries are set up in the flow field under the submerged nozzle and immediately adjacent to the nozzle/case joint. Specific program objectives included: determination of the effects of nozzle gimbal angle and propellant geometry on the circumferential flow field; measurement of the static pressure and gas velocities in the vicinity of the nozzle/case joint; use of scaling laws to apply the subscale cold flow data to the full scale SRM; and generation of data for use in validation of 3-D computational fluid dynamic, CFD, models of the SRM flow field. These tests were conducted in the NASA Marshall Space Flight Center Airflow Facility with a 7.5 percent scale model of the aft segment of the SRM. Static and dynamic pressures were measured in the model to quantify the flow field. Oil flow data was also acquired to obtain qualitative visual descriptions of the flow field. Nozzle gimbal angles of 0, 3.5, and 7 deg were used with propellant grain configurations corresponding to motor burn times of 0, 9, 19, and 114 seconds. This experimental program was successful in generating velocity and pressure gradient data for the flow field around the submerged nose nozzle of the Space Shuttle SRM at various burn times and gimbal angles. The nature of the flow field adjacent to the nozzle/case joint was determined with oil droplet streaks, and the velocity and pressure gradients were quantified with pitot probes and wall static pressure measurements. The data was applied to the full scale SRM thru a scaling analysis and the results compared well with the 3-D computational fluid dynamics computer model

Women and the Labour Party: Gender and the Writing of British Political History

This article takes stock of the state of women's political history in the twentieth century and suggests new lines of enquiry, drawing on the authors’ own work on the Labour Party. It identifies a number of key themes which have enriched histories of women and gender in the nineteenth and early twentieth century and considers how these might be developed. Firstly, it examines the significance of the local, and more particularly, the neighbourhood, in women's political lives. Secondly, it asserts the value of focussing on the membership, including the economic, social and cultural shifts that shaped their lives, the intersection of gender with factors such as age or ethnicity, and their own political identities. Finally, it stresses the importance of interrogating masculine cultures to understand how gendered dynamics played out. It concludes with a reminder that inserting women into established political narratives is insufficient: the point is to transform those narratives

Effective field theory and the quark model

We analyze the connections between the quark model (QM) and the description of hadrons in the low-momentum limit of heavy-baryon effective field theory in QCD. By using a three-flavor-index representation for the effective baryon fields, we show that the ``nonrelativistic'' constituent QM for baryon masses and moments is completely equivalent through O(m_s) to a parametrization of the relativistic field theory in a general spin--flavor basis. The flavor and spin variables can be identified with those of effective valence quarks. Conversely, the spin-flavor description clarifies the structure and dynamical interpretation of the chiral expansion in effective field theory, and provides a direct connection between the field theory and the semirelativistic models for hadrons used in successful dynamical calculations. This allows dynamical information to be incorporated directly into the chiral expansion. We find, for example, that the striking success of the additive QM for baryon magnetic moments is a consequence of the relative smallness of the non-additive spin-dependent corrections.Comment: 25 pages, revtex, no figure

Public Libraries as Supportive Environments for Children’s Development of Critical Health Literacy

Critical health literacy enables individuals to use cognitive and social resources for informed action on the wider determinants of health. Promoting critical health literacy early in the life-course may contribute to improved health outcomes in the long term, but children’s opportunities to develop critical health literacy are limited and tend to be school-based. This study applies a settings-based approach to analyse the potential of public libraries in England to be supportive environments for children’s development of critical health literacy. The study adopted institutional ethnography as a framework to explore the public library as an everyday setting for children. A children’s advisory group informed the study design. Thirteen children and 19 public library staff and community stakeholders were interviewed. The study results indicated that the public library was not seen by children, staff, or community stakeholders as a setting for health. Its policies and structure purport to develop health literacy, but the political nature of critical health literacy was seen as outside its remit. A supersetting approach in which children’s everyday settings work together is proposed and a conceptual model of the public library role is presented

Shocks in supersonic sand

We measure time-averaged velocity, density, and temperature fields for steady granular flow past a wedge and calculate a speed of granular pressure disturbances (sound speed) equal to 10% of the flow speed. The flow is supersonic, forming shocks nearly identical to those in a supersonic gas. Molecular dynamics simulations of Newton's laws and Monte Carlo simulations of the Boltzmann equation yield fields in quantitative agreement with experiment. A numerical solution of Navier-Stokes-like equations agrees with a molecular dynamics simulation for experimental conditions excluding wall friction.Comment: 4 pages, 5 figure

'The confidence to do things that I know nothing about’ – skills development through extra-curricular inquiry activity

This article presents the findings of a survey given to students engaging in educational enhancement activities in inquiry/enquiry-based learning at two Centres for Excellence in Teaching and Learning (CETL). The students involved were asked to comment on the skills they felt that they had developed as part of their roles as 'interns' and 'ambassadors'. These comments were analysed inductively and several strong themes emerged. Students valued the opportunity to engage in such activities, which developed a wide range of transferable skills and had a positive impact on their academic work and their prospects for future employment. While there is a considerable amount of literature on higher education and skills development, a growing body of work on how curricular inquiry-based learning impacts upon students' capabilities, and a plethora of studies on how paid and unpaid extra-curricular activities affect students' educational achievement, few studies have sought to relate these areas of research