1,360,467 research outputs found
The Nunn family, a short sketch of John Milton Nunn + Sallie Heiston Nunn, their ancestors and descendants.
No full text"Compiled by Chas. G. and Henry L. Nunn."Mode of access: Internet
Path Toward a World Free of Nuclear Weapons: the Euro-Atlantic Challenge [Introductions and morning address]
No full textPresented at the 2010 Sam Nunn Bank of America Policy Forum: Path Toward a World Free of Nuclear Weapons: The Euro-Atlantic Challenge, March 29, 2010, in the GT Hotel BallroomRuntime: 120:39 minutesIntroductions and Welcoming Remarks: Brian Woodall, Acting Chair, Sam Nunn School of International Affairs, Georgia Institute of Technology ; Honorable Sam Nunn, Distinguished Professor, Sam Nunn School of International Affairs, Georgia Institute of Technology ; Co-Chairman and Chief Executive Officer, Nuclear Threat Initiative.
Morning Addresses: Adam N. Stulberg, Associate Professor & Co-Director, Center for International Strategy, Technology, and Policy, Sam Nunn School of International Affairs, Georgia Institute of Technology ; Video Featuring the Honorable Gareth Evans, President Emeritus, International Crisis Group ; Ambassador Sergey Kislyak, Ambassador Extraordinary and Plenipotentiary, Embassy of the Russian Federation in Washington DC
The contested and contingent outcomes of Thatcherism in the UK
No full textThe death of Margaret Thatcher in April 2013 sparked a range of discussions and debates about the significance of her period in office and the political project to which she gave her name: Thatcherism. This article argues that Thatcherism is best understood as a symbolically important part of the emergence of first-phase neoliberalism. It engages with contemporary debates about Thatcherism among Marxist commentators and suggests that several apparently divergent positions can help us now reach a more useful analysis of Thatcherism’s short- and long-term outcomes for British political economy. The outcomes identified include: an initial crisis in the neoliberal project in the UK; the transformation of the party political system to be reflective of the politics of neoliberalism, rather than its contestation; long-term attempts at the inculcation of the neoliberal individual; de-industrialisation and financial sector dependence; and a fractured and partially unconscious working class. In all long-term outcomes, the contribution of Thatcherism is best understood as partial and largely negative, in that it cleared the way for a longer-term and more constructive attempt to embed neoliberal political economy. The paper concludes by suggesting that this analysis can inform current debates on the left of British politics about how to oppose and challenge the imposition of neoliberal discipline today
Oral History Interview: Gladyce K. Nunn
Full text linkMrs. Nunn is a retired school teacher who in 1974 was living in Oceana, West Virginia. In this interview, she focuses on her teaching experiences. Mrs. Nunn also reflects on the changes she has observed in education.https://mds.marshall.edu/oral_history/1119/thumbnail.jp
VLF emission triggering by a highly anisotropic electron plasma
No full textA recent paper by Bell et al (Bell et al,2000) reports observations from the POLAR spacecraft of highly anisotropic hot electron distribution functions in the equatorial region of the magnetosphere at L=3.4. The particle instrument HYDRA measures electron fluxes from 1-20 keV. VLF emissions triggered by pulses from Omega (Norway) are found to coincide with 'pancake' type electron distributions with average pitch angles >70 degrees, such distributions being effectively confined to the equatorial zone. We examine the linear and non linear wave particle interaction process between pancake distributions and CW ducted VLF signals. It is concluded that the pitch angle range 67-76 degrees dominates the interaction process, and that with in duct wave saturation amplitudes of 6pT strong non linear trapping occurs for these particles. It is difficult to avoid the impression that highly anisotropic pitch angle distributions don’t have a great effect on resonant particle dynamics. High anisotropy has raised the pitch angle of maximum non linear contribution from 61->72 degrees, and reduced particle non linearity somewhat, in that the onset of trapping occurs at 2pT rather than 1.6pT. Using this data a 1D Vlasov Hybrid Simulation (VHS) VLF code was run to numerically simulate risers triggered by a 1 s Omega pulse. The VHS algorithm defines a time varying phase space simulation box covering the trans-equatorial nonlinear trapping region and a segment of parallel velocity space centred on the local resonance velocity. The simulation particles have F defined as a constant on their trajectories by Liouville's theorem. At each time step F is interpolated from the particles onto the fixed phase space grid, allowing resonant particle current to be calculated. The VHS method is extremely efficient since at each step particles leaving the phase box are discarded, and fresh particles are embedded into the phase fluid where the latter flows into the phase box. Successful numerical triggering of emissions by Omega is shown, and examples of risers, fallers and hooks are shown. The integrated linear trans-equatorial amplification of ~10dB agreed well with figures calculated by Bell from HYDRA data. These successful simulations of Omega emissions with highly anisotropic distribution functions confirm that non linear trapping of cyclotron resonant electrons in the geomagnetic field is the root plasma physical mechanism behind the triggering of VLF emissions
Correspondence: April 21, 1989, Note from Senator Sam Nunn, Georgia
Full text linkA note from United States Senator Sam Nunn to Dr. Edna L. Saffy
Q & A with Keynote Speaker Lisa Nunn, Ph.D.
No full textLOCATION: George's (3rd Floor of the Johnson Center)
Our keynote speaker, Lisa Nunn, Ph.D., will answer audience questions. This session follows her keynote address from 9-10:15am in Dewberry Hall
Nunn, Andrew: transcript of a video interview (09-Aug-2016)
Full text linkInterview with Professor Andrew Nunn, conducted by Professor Tilli Tansey, for the History of Modern Biomedicine Research Group, 09 August 2016, in the School of History, Queen Mary University of London. Transcribed by Mrs Debra Gee, and edited by Professor Tilli Tansey and Mrs Sarah Beanland. The project management and the technical support (filming and production) were undertaken by Mr Adam Wilkinson and Mr Alan Yabsley, respectively. Professor Andrew Nunn (b. 1943) has been working in clinical trials and epidemiological research since 1966, when he joined the Medical Research Council (MRC) Tuberculosis & Chest Diseases Unit as a Statistician, becoming Senior Statistician in 1972. Until 1986 he was directly involved in the design, conduct and analysis of the programme of trials conducted under the leadership of Professors Wallace Fox and Denny Mitchison in East Africa, Hong Kong and Singapore, which led to the worldwide adoption of short-course chemotherapy for tuberculosis (TB). Following the closure of that Unit he joined the MRC’s Uganda AIDS Programme which researched the dynamics of the human immunodeficiency virus (HIV) epidemic in a rural African environment. On his return to the UK, he became Head of the Division Without Portfolio within the newly formed MRC Clinical Trials Unit with responsibility for developing trials in neglected areas. He was Senior Statistician on the recently completed REMoxTB and RIFAQUIN trials. Currently, he is an Investigator and Senior Statistician on three international phase 3 trials of TB treatment, one of which, STREAM, he is Co-Chief Investigator, the first phase 3 trial in multidrug-resistant TB (MDR-TB).The History of Modern Biomedicine Research Group is funded by the Wellcome Trust, which is a registered charity (no. 210183). The current interview has been funded by the Wellcome Trust Strategic Award entitled “Makers of modern biomedicine: testimonies and legacy” (2012-2017; awarded to Professor Tilli Tansey)
The numerical simulation of the performance of a robustised broadband frequency LMS adaptive beamformer
No full textThe paper is concerned with the optimal processing of data from an array of sensors/antennas. Such sensors may be sonar, radar, VHF/HF radio or 'acoustics in air'. The processing aims might be any of the following: (a) detection and identification of weak wanted signals. (b) Bearing estimation of weak wanted signals. (c) Presentation of the time series of wanted signals at maximum S/N ratio for further processing/display. (d) Accurate bearing estimation and discrimination of strong signal sources. All array beamformer techniques suffer difficulties when applied in the field. Highly optimised algorithms are quickly degraded by multipathing, array deformation and by sensor errors. Time varying noise fields and finite integration time exact a further toll. Eigenvector methods such as MUSIC are rather expensive when applied to broadband environments. The authors consider a broad band robustised LMS frequency domain adaptive algorithm as described in Nunn (1989). Its performance is analysed in numerical simulations incorporating multipathing, array distortion, sensor errors and finite integration time
Trimpi Perturbations from Large Ionisation Enhancement Patches
No full textA number of increasingly sophisticated and realistic models have been developed in order to investigate the interaction between sub-ionospherically propagating VLF waves and regions of enhanced electron density in the D-region caused by lightning induced electron precipitation (LIEs). These LIEs can result in phase and amplitude perturbations on received VLF signals that are referred to as Trimpis. It is important, for comparison with experimentally observed Trimpi effects, that the spatial extent of the D-region electron density perturbation is modeled accurately. Here, it is argued that most previous modeling has used patch sizes that are typically up to 100 km in both latitudinal and longitudinal extent, which are generally smaller than those that actually occur for real lightning induced electron precipitation events. It would also appear that maximum ?Ne values assumed have often been too large and patches have been incorrectly modeled as circular rather than elliptical in horizontal extent. Consequently, in the present work, Trimpi perturbations are determined for LIEs with smaller maximum ?Ne, larger spatial extent and elliptical shape. Calculations of VLF Trimpis have been made as a function of the horizontal coordinates of the LIE centre, over the whole rectangular corridor linking transmitter and receiver. The Trimpi modelling program is fully 3D, and takes account of modal mixing at the LIE. The underlying theory assumes weak Born scattering, but the code calculates a non-Born skin depth attenuation function for the LIE in question. The LIE is modelled as an electron density enhancement with a Gaussian profile in all coordinates. Results for a large elliptical LIE ~ 200 x 600 kms show that significant Trimpis, ~-0.4dB in amplitude and ~+4 degrees in phase are predicted, using modest maximum ?Ne values ~ 1.5 el/cc. Such an electron density enhancement is well within the range that would be expected to result from experimentally observed fluxes of electron precipitation following wave particle interactions with whistler-mode waves. This shows the continued viability of the original explanation of whistler-induced electron precipitation as the mechanism for the “Classical Trimpi”
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