1,658 research outputs found

    An ultra-weak sector, the strong CP problem and the pseudo-Goldstone dilaton

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    In the context of a Coleman-Weinberg mechanism for the Higgs boson mass, we address the strong CP problem. We show that a DFSZ-like invisible axion model with a gauge-singlet complex scalar field S, whose couplings to the Standard Model are naturally ultra-weak, can solve the strong CP problem and simultaneously generate acceptable electroweak symmetry breaking. The ultra-weak couplings of the singlet S are associated with underlying approximate shift symmetries that act as custodial symmetries and maintain technical naturalness. The model also contains a very light pseudo-Goldstone dilaton that is consistent with cosmological Polonyi bounds, and the axion can be the dark matter of the universe. We further outline how a SUSY version of this model, which may be required in the context of Grand Unification, can avoid introducing a hierarchy problem.Comment: 9 page

    Ultra-weak sector, Higgs boson mass, and the dilaton

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    The Higgs boson mass may arise from a portal coupling to a singlet field σ\sigma which has a very large VEV fmHiggsf \gg m_\text{Higgs}. This requires a sector of "ultra-weak" couplings ζi\zeta_i, where ζimHiggs2/f2\zeta_i \lesssim m_\text{Higgs}^2 / f^2. Ultra-weak couplings are technically naturally small due to a custodial shift symmetry of σ\sigma in the ζi0\zeta_i \rightarrow 0 limit. The singlet field σ\sigma has properties similar to a pseudo-dilaton. We engineer explicit breaking of scale invariance in the ultra-weak sector via a Coleman-Weinberg potential, which requires hierarchies amongst the ultra-weak couplings.Comment: 6 page

    Observations and models for needle-tissue interactions

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    The asymmetry of a bevel-tip needle results in the needle naturally bending when it is inserted into soft tissue. In this study we present a mechanics-based model that calculates the deflection of the needle embedded in an elastic medium. Microscopic observations for several needle- gel interactions were used to characterize the interactions at the bevel tip and along the needle shaft. The model design was guided by microscopic observations of several needle- gel interactions. The energy-based model formulation incor- porates tissue-specific parameters such as rupture toughness, nonlinear material elasticity, and interaction stiffness, and needle geometric and material properties. Simulation results follow similar trends (deflection and radius of curvature) to those observed in macroscopic experimental studies of a robot- driven needle interacting with different kinds of gels. These results contribute to a mechanics-based model of robotic needle steering, extending previous work on kinematic models

    What is "gender expression"? How a New and Nebulous Human Rights Construct Is Taking Shape in Ontario School Board Policy Documents

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    In 2002, jurisdictions across Canada began adding two new protected grounds to their human rights laws: gender identity and/or gender expression. Gender identity protections generally apply only to transgender people, whereas gender expression protections may apply to all Canadians in places like K–12 schools. However, it remains legally unclear what kind of action, utterance, or pattern constitutes gender expression discrimination, and who can access related protections. In search of clarification, this article explores how the meaning of gender expression is being constructed within policy documents (N = 206) authored at the level of Ontario’s English public secular school boards. Keywords: gender expression, gender identity, transgender, education policy, education law, K–12, Ontario, CanadaEn 2002, des ressorts dans l’ensemble du Canada ont commencé à ajouter deux nouveaux motifs de discrimination interdits à leurs lois sur les droits de la personne, soit l’identité sexuelle et/ou l’expression de l’identité sexuelle ou de genre. Les protections entourant l’identité ne s’appliquent en général qu’aux personnes transgenres, alors que les protections entourant l’expression sexuelle ou de genre peuvent s’appliquer à tous les Canadiens et Canadiennes dans des endroits tels que les écoles élémentaires et secondaires. Une incertitude juridique demeure toutefois à l’égard du type d’action, de propos ou de schéma de comportement qui constitue une discrimination à l’égard de l’expression sexuelle ou de genre et à savoir qui peut se prévaloir des protections qui en découlent. Dans le but de clarifier cet aspect, cet article explore la manière dont la signification de l’expression sexuelle ou de genre est façonnée dans le cadre des politiques (N = 206) adoptées à l’échelon des conseils scolaires publics laïques de l’Ontario. Mots-clés : l’expression de l’identité sexuelle, l’identité sexuelle, transgenre, politique d’éducation, droit de l’éducation, écoles élémentaires et secondaires, Ontario, Canad

    Utilizing Guided Simulation in Conjunction with Digital Learning Tools in Air Traffic Control Training to Enhance Learning at the Collegiate Level

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    Students in an air traffic control program are required to learn and apply advance knowledge and skills in a limited time frame. All students learn at different rates as well as through different learning styles. Swivl is a video capture tool designed to enhance student learning by allowing students to refer back to their individual classroom lab training session videos via an online portal. Swivl is being utilized in two ATC lab courses. During this research, two technological shortcomings were discovered: (1) Swivl lacks the ability to capture audio from the COA’s existing communication software and (2) Swivl cannot focus on the radar display. As a result, the videos have lacked visual clarity when reviewing the session. Consequently Swivl has been shown to be an ineffective digital learning tool for this situation. Swivl, used in conjunction with a simulated ATC tower, has proven to be effective in enhancing overall learning due to the visual nature of the tower learning environment. The nature of the tower simulator allows for better visual acuity and effective communication exchange within the Swivl videos. Once these two issues are resolved, Swivl will have the potential to be an effective tool in ATC training, and may enhance learning by allowing students to sharpen those skills necessary for advancement in the field of air traffic control

    Technology and Opportunity: People with Serious Mental Illness and Social Connection

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    Objective: Little information exists regarding how individuals with serious mental illness use technology and whether this usage facilitates social connections. This study contributes to filling this knowledge gap by examining ways in which a sample of persons with serious mental illness use cell phones and the Internet. Methods: Interviews with 50 consumers living in supported housing were asked about their use of cell phones and computers and their perceptions of social connections. Results: Cell phones and computers allowed greater linkage with social, medical, mental health, and employment resources. Nearly all obtained phones through publicly funded programs. “Running out of minutes” was common and associated with disrupted communication and safety concerns. Few people owned computers, resulting in restricted access. Conclusion: Policymakers should consider providing free or discounted hardware, subsidizing unlimited plans, and promoting computer literacy

    ‘You Are What You Read:’ Is selective exposure a way people tell us who they are?

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    Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/156182/2/bjop12414_am.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/156182/1/bjop12414.pd

    Master\u27s Recital

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    List of performers and performances

    How to FSSE: Everything you need to know

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    As we launch the Faculty Survey of Student Engagement (FSSE) please join us as we discuss all things FSSE related. This webinar provides past, current, and future (FSSE) participating institutions information about the FSSE project, administration processes, data files and reporting, and online FSSE resources. Webinar participants will learn about what to expect from a FSSE administration and how FSSE can be used to add context to a NSSE administration.We invite you to join us as we discuss the importance of students’ sense of belonging and how to examine belongingness within small populations
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