3,191 research outputs found
Interview: Jason Dittmer Interviewed by Steven M. Schnell, Editor, The Geographical Bulletin
No full textJason Dittmer is from Jacksonville, Florida, received his PhD from Florida State University in 2003, and has taught at University College London in the United Kingdom since 2007. He is the author of Popular Culture, Geopolitics, and Identity (Rowman and Littlefield, 2010) and the co-editor of Mapping the End Times: American Evangelical Geopolitics and Apocalyptic Visions (Ashgate, 2010). He is married to the lovely Stephanie and has two cats. They all live in southeast London
Mapping the political geographies of Europeanization: National discourses, external perceptions and the question of popular culture
No full textPolitical geographers have significantly contributed to understandings of the spatialities of Europeanization. We review some of this work, while also highlighting research themes where further political-geographic research would be insightful. We note the importance of work that captures both the diverse expressions and meanings attributed to Europe, European integration and 'European power' in different places within and beyond the EU, and the variegated manifestations of 'Europeanizing' processes across these different spaces. We also suggest that political-geographic research can add crucial input to reconceptualizing European integration as well as Europeanization as it now unfolds in a time of 'crisis'. © The Author(s) 2012
Fossil record of Mollusca from Neogene sediments in Schleswig-Holstein, Germany
No full textÜber die Verbreitung, Gliederung und Ausbildung des Jungtertiärs im westlichen Schleswig-Holstein war bisher nicht viel bekannt. Am besten bearbeitet sind die glazial gestauchten Schollen von Morsum/Sylt. Eine Aufzählung erbohrter Miozänvorkommen mit nicht immer überzeugender Begründung lieferte H.-L. HECK 1935. S. THIELE (1941) hat die ihm bekannten Vorkommen hauptsächlich nach faziellen und petrographischen Gesichtspunkten bearbeitet. Er erkannte richtig die Stellung der Braunkohlensande. Die angekündigte palaeontologische Bearbeitung ist nicht erschienen. Eine allgemeine Übersicht über die Entwicklung des Jungtertiärs bringen W. WOLFE und H.-L. HECK 1949. W. HINSCH lieferte wertvolle Beiträge zur Molluskenfauna und zur Gliederung des Miozäns (1952, 1955). Über neue Vorkommen von Braunkohlen-Sanden berichtete E. DITTMER(1 956), eine erste Übersicht über neue Vorkommen der Hemmoorer Stufe gab derselbe Verfasser 1957
Feasible Alternatives to Green Growth
No full textClimate change and increasing income inequality have emerged as twin threats to contemporary standards of living, peace and democracy. These two problems are usually tackled separately in the policy agenda. A new breed of radical proposals has been advanced to manage a fair low-carbon transition. In this spirit, we develop a dynamic macrosimulation model to investigate the long-run effects of three scenarios: Green Growth, Policies for Social Equity, and Degrowth. The Green Growth scenario, based on technological progress and environmental policies, achieves a significant reduction in greenhouse gas emissions at the cost of increasing income inequality and unemployment. The Policies for Social Equity scenario adds direct labour market interventions that result in an environmental performance similar to Green Growth while improving social conditions at the cost of increasing public deficit. The Degrowth scenario further adds a reduction in consumption and exports and achieves a greater reduction in emissions and inequality with higher public deficit despite the introduction of a wealth tax. This study argues that new radical social policies, although often deemed economically and politically unfeasible, can combine social prosperity and low-carbon emissions.</p
Env-Independent Protection Induced by Live, Attenuated Simian Immunodeficiency Virus Vaccines
No full textABSTRACT
Live attenuated simian immunodeficiency viruses (SIV), such as
nef
deletion mutants, are the most effective vaccines tested in the SIV-macaque model so far. To modulate the antiviral immune response induced by live attenuated SIV vaccines, we had previously infected rhesus monkeys with a
nef
deletion mutant of SIV expressing interleukin 2 (SIV-IL2) (B. R. Gundlach, H. Linhart, U. Dittmer, S. Sopper, S. Reiprich, D. Fuchs, B. Fleckenstein, G. Hunsmann, S. Stahl-Hennig, and K. Überla, J. Virol. 71:2225–2232, 1997). In the present study, SIV-IL2-infected macaques and macaques infected with the
nef
deletion mutant SIVΔNU were challenged with pathogenic SIV 9 to 11 months postvaccination. In contrast to the results with naive control monkeys, no challenge virus could be isolated from the SIV-IL2- and SIVΔNU-infected macaques. However, challenge virus sequences could be detected by nested PCR in some of the vaccinated macaques. To determine the role of immune responses directed against Env of SIV, four vaccinated macaques were rechallenged with an SIV-murine leukemia virus (MLV) hybrid in which the
env
gene of SIV had been functionally replaced by the
env
gene of amphotropic MLV. All vaccinated macaques were protected from productive infection with the SIV-MLV hybrid in the absence of measurable neutralizing antibodies, while two naive control monkeys were readily infected. Since the SIV-MLV hybrid uses the MLV Env receptor Pit2 and not CD4 and a coreceptor for virus entry, chemokine inhibition and receptor interference phenomena were not involved in protection. These results indicate that the protective responses induced by live attenuated SIV vaccines can be independent of host immune reactions directed against Env
Psychometric properties of the Commitment to Exercise Scale in inpatients with anorexia nervosa and bulimia nervosa
No full textPreregistration, data, and code for the study reported in Fabry, F.M., Schlegl, S., Dittmer, N., Voderholzer, U., Kolar, D.R., & Meule, A. (2026). Psychometric properties of the Commitment to Exercise Scale in inpatients with anorexia nervosa and bulimia nervosa. European Eating Disorders Review. https://doi.org/10.1002/erv.7009
Improving Line-Point Zero Knowledge: Two Multiplications for the Price of One
No full textRecent advances in fast protocols for \textit{vector oblivious linear evaluation} (VOLE) have inspired a family of new VOLE-based lightweight designated-verifier NIZK protocols (Weng et al., S\&P 2021, Baum et al., Crypto 2021, Dittmer et al., ITC 2021, Yang et al., CCS 2021). In particular, the Line-Point Zero Knowledge (LPZK) protocol of Dittmer et al.\ has the advantage of being entirely non-cryptographic given a single instance of a random VOLE correlation.
We present improvements to LPZK through the introduction of additional structure to the correlated randomness. Using an efficiently realizable variant of the VOLE correlation, we reduce the online proof size of LPZK by roughly 2x: from roughly 2 field elements per multiplication gate, or 1 element in the random oracle variant, to only 1 or elements respectively. In particular, we get the first practical VOLE-based NIZK that breaks the 1-element-per-multiplication barrier.
We implemented an optimized version of our protocol and compared it with other recent VOLE-based NIZK protocols. In the typical case where communication is the bottleneck, we get at least 2x performance improvement over all previous VOLE-based protocols. When prover computation is the bottleneck, we outperform all non-LPZK protocols by at least -x and (our optimized implementation of) LPZK by roughly 30%, obtaining a -x slowdown factor compared to plain circuit evaluation
Rotational and vibrational cooling in pulsed high-pressure molecular beam expansions from 3 bar into the supercritical regime.
No full textExperiments employing pulsed high-pressure ( S(1)(0-0) transition by an asymmetric-top/free-internal-rotor simulation and compared with the results of a simpler rigid-rotor asymmetric-top tit. The experiments show that average rotational temperatures of ca. K in argon and 13-15 K in CO(2) can he reached at the highest pressures studied. The population of higher vertical bar m vertical bar torsional levels of p-fluorotoluene is clearly demonstrated by the appearance of characteristic features on the blue edge of the contours, which are more pronounced in the warmer CO(2) expansions. While the rotational temperatures in nitrogen expansions compare well with estimated CO(2) dynamical terminal translation temperatures, there are Considerable differences in the case of CO(2). Still, the degree of internal cooling reached with CO(2) is sufficiently low, so that a setup of this kind :bight provide good opportunities for future studies of thermally labile low-volatile molecules to cool them to cryogenic temperatures low enough to achieve a sufficient amplification of their spectra.University of Bristo
Phylogenetic structure of Holbrookia lacerata (Cope 1880) (Squamata: Phrynosomatidae): one species or two?
No full textHibbitts, Toby J., Ryberg, Wade A., Harvey, Johanna A., Voelker, Gary, Lawing, A. Michelle, Adams, Connor S., Neuharth, Dalton B., Dittmer, Drew E., Duran, C. Michael, Wolaver, Brad D., Pierre, Jon Paul, Labay, Benjamin J., Laduc, Travis J. (2019): Phylogenetic structure of Holbrookia lacerata (Cope 1880) (Squamata: Phrynosomatidae): one species or two? Zootaxa 4619 (1): 139-154, DOI: 10.11646/zootaxa.4619.1.
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