The alkylation and acylation of some 1,3 ambident nucleophiles

Imperial Users onl

Formalizing Education about Public Health Leadership during Professional Preparation

This year is the fourth year that the Florida Public Health Review (FPHR) has published student essays that attempt to illustrate how the application of specific leadership paradigms might, in theory, be responsive in addressing challenging and historically unresponsive problems in public health. Other public health students, faculty, and practitioners from throughout Florida are invited to contribute ideas that foster leadership skills and the development ofdynamic leaders

Sapere Aude — Dare to Be Wise: Robert J. McDermott

Sapere Aude – Dare to Be Wise is a unique editorial conversational interview-type feature. It is an attempt to deep dive into an Academy members’ background, formative experience, and education – specifically, to extract factors that contributed to their development and evolution as a professional, as well as their success as a prominent researcher in the health behavior arena. Every Academy member selected has a different story to tell and numerous models for success will emerge from this exploration of the membership

Life, Career, and Graduate School – Challenge and Opportunity for Students

Since 2007 I have had the opportunity to teach Writing for Scholarly Publication as part of the Population Health Summer Institute at the University of Wisconsin-Madison School of Medicine and Public Health. In a course so brief (five three-hour meetings over a period of 10 days), finding topics through which students can develop their writing talent and complete a publishable paper is an arduous task. Two years ago, students prepared commentaries about why they were (or were not) worried about their future as public health professionals, and four of these short essays were published in the Florida Public Health Review, as they had application for students facing similar concerns in Florida and elsewhere. This year I share some essays from graduate students on the challenge of balancing school, family, career, and other demands of life – another common thread for those pursuing advanced study in public health and related fields

Leadership, Leadership Paradigms, and Leadership Training in 2010 and Beyond

Since 2008, the Florida Public Health Review (FPHR) has published student essays that attempt to illustrate how the application of specific leadership paradigms might, in theory, be applied to address some nagging and ongoing problems in public health and related endeavors. The current volume of the FPHR continues that tradition. Other public health students, faculty, and practitioners from around the state are invited to contribute ideas that foster leadership skills and the development of dynamic leaders

Helical waves in Earth's outer core

This thesis addresses the generation and dispersion of wave packets in Earth's outer core. The waves of interest feed off the buoyancy field, and are supported by strong rotation and/or a large-scale magnetic field, two key features of the dynamics in Earth's core. We aim to better understand the role of wave packets in shaping the turbulent convection, the process of magnetic induction, and maintaining Earth's magnetic field. Our numerical experiments focus on the emission of wave packets from localised sources, on the small length-scales of the convection, which stirs the fluid iron. The fluid flow in Earth's outer core is characterised by a small Rossby number, the ratio of nonlinear inertia and the Coriolis acceleration. However, due to computational constraints, many geodynamo simulations lie in a regime where the convective structures have a moderate Rossby number. These simulations, that over-estimate the influence of nonlinear inertia, undergo an abrupt transition from a columnar flow structure with a strongly dipolar magnetic field, to a state of disorganised flow accompanied by a multipolar field. This transition is commonly termed the \emph{dipolar-multipolar} transition, and the collapse of the dipole occurs when the \emph{`local'} Rossby number \citep[as introduced by][]{christensen2006} is greater than $0.1$. Separately, in the rotating turbulence literature, there is preliminary evidence of a similarly sharp transition from a columnar flow structure to incoherent turbulence when the Rossby number is $Ro \sim 0.2-0.6$. We show, that when $Ro > Ro^{\text{crit}} \approx 0.4$, inertial wave packets are suppressed, and columnar flow structures break down. Furthermore, we highlight a relationship between the `local' Rossby number used to describe the dipolar-multipolar transition and our $Ro$, which places both transitions at approximately $Ro^{\text{crit}}$. Based on this evidence, we conjecture that the breakdown of columnar structures, followed by the dipole collapse, is caused by the suppression of inertial wave packets at the critical threshold. In the following series of simulations, we study the effects of an ambient magnetic field on the dispersion of inertial wave packets. In the presence of an large-scale field, inertial waves are modified into a spectrum of waves called \emph{magnetic-Coriolis} waves, which present in a variety of forms depending on the wave-frequency. We focus on the Earth-like regime of rapid rotation and a small Lehnert number, $Le$, the ratio of the Alfv\'en and inertial frequencies. Our simulations initiated with a single buoyant blob yield an excellent comparison to the diffusion-less analytical results of \cite{bardsley2016} at $Ro \rightarrow 0$ and $Le = 0.1$. We identify three wave-types, predicted by linear theory, based on the waves' group velocity, helicity characteristics, and magnetic to kinetic energy ratio. At Earth-like values of $Le$, we observe that magnetic-Coriolis wave packets distribute helicity in a way that is beneficial to planetary magnetic field generation. Furthermore, the emf induced by the wave packets is coherent for Earth-like values of $Le$, suggesting than an $\alpha$-effect associated with the waves has the potential to drive a \emph{helical wave dynamo} \citep{davidson2014}

A Thermochronometric, Microtextural, and Numerical Modeling Approach to Deciphering the Rock Record of Deformation Processes in the Wasatch and Denali Fault Zones

Fault zones are the primary features that accommodate movement of Earth’s crust, resulting in the formation of mountain belts and damaging earthquakes. Rocks modified by faulting and brought to Earth’s surface by erosion are archives of the mechanical processes involved in earthquakes and(or) aseismic creep. Thermochronometry is a radioisotopic dating system primarily sensitive to temperature and offers a means to constrain dates and rates of thermal processes. Hematite is common in fault zones, amenable to (U-Th)/He (He) thermochronometry, and exhibits distinct microtextures diagnostic of fault zone mechanics. I apply hematite He thermochronometry and microtextural analyses with a suite of other tools to interrogate the evolution of the Wasatch fault zone (WFZ), UT, USA, and the eastern Denali fault zone (EDFZ), Yukon, Canada over different scales in space and time. Hematite He dates and microtextures from hematite-coated fault surfaces and veins from the WFZ show fault surfaces accommodated ancient seismicity. Although this seismicity isage, fault surfaces formed within pre-existing hematite that is 100s of Myr older. Microtextures reveal that WFZ earthquakes were facilitated by fluidization of hematite, extreme grain size reduction and rolling between grains, and breakdown of rough fault surfaces. Small fault surfaces in the WFZ are ultimately the product of deformation processes occurring throughout deep geologic time and at different timescales culminating in earthquakes. Low-temperature thermochronometry is also used to constrain erosion related to surface uplift of mountains adjacent to the EDFZ. Results show growth of topography and deformation along the EDFZ occurred in three stages from ~95–75 Ma, ~75–30 Ma, and ~30 Ma–present, primarily as a response to plate boundary processes \u3e200 km away. Hematite He dates from hematite-coated fault surfaces in the EDFZ constrain hematite precipitation at ~8–4 Ma and reveal a record of faulting that contributes to mountain growth. Hematite microtextures in these samples suggest aseismic fault slip. The collective results of this dissertation highlight the spectrum of deformation of Earth’s crust from the mountain- to fault surface-scales and from 100s of Myr to seconds, as well as the different tectonic and mechanical processes responsible for this evolution

The Born Again Florida Public Health Review – A Commentary

After a brief hiatus from active operation, the Florida Public Health Review is back in business and with a new home at The University of Tampa. The Founding Editor reflects on a decade of the publication’s history, including its trials and triumphs, and prepares to pass the torch to a new editor, a new era, and a new vision

Ron Littlepage

Ron Littlepage, staff columnist at the Florida Times Union, interviewed by Robert McDermott on October 26, 2010