1,455 research outputs found
A Frontal Dust Storm in the Northern Hemisphere at Solar Longitude 97 : An Unusual Observation by the Emirates Mars Mission
Funding Information: Funding for the development of the EMM mission was provided by the United Arab Emirates Government, and to coâauthors outside of the United Arab Emirates by the Mohammed Bin Rashid Space Centre. This work was also supported by a joint research agreement between the Mohammed Bin Rashid Space Centre and the National Space Science and Technology Center in the United Arab Emirates University. CG, BKG, and RMBY were supported by the United Arab Emirates University Grant âMars and Earth atmospheric science research at the National Space Science and Technology Center,â G00003407. RMBY was also supported by UAE University grant G00003322.Peer reviewe
Complex formation between deoxyhypusine synthase and its protein substrate, the eukaryotic translation initiation factor 5A (eIF5A) precursor
Sub-Hourly Observations of Dust Storm Growth, Lee Waves, and Lyot Crater, by the EMM Camera EXI
Funding Information: Funding for the development of the EMM mission was provided by the United Arab Emirates Government, and to coâauthors outside of the United Arab Emirates by the Mohammed Bin Rashid Space Centre. This work was also supported by a Joint Research Agreement between the Mohammed Bin Rashid Space Centre and the National Space Science and Technology Center in the United Arab Emirates University. CG, BKG, and RMBY were supported by the United Arab Emirates University through research Grant G00003407.Peer reviewedPublisher PD
Critical Behavior and Lack of Self Averaging in the Dynamics of the Random Potts Model in Two Dimensions
We study the dynamics of the q-state random bond Potts ferromagnet on the
square lattice at its critical point by Monte Carlo simulations with single
spin-flip dynamics. We concentrate on q=3 and q=24 and find, in both cases,
conventional, rather than activated, dynamics. We also look at the distribution
of relaxation times among different samples, finding different results for the
two q values. For q=3 the relative variance of the relaxation time tau at the
critical point is finite. However, for q=24 this appears to diverge in the
thermodynamic limit and it is ln(tau) which has a finite relative variance. We
speculate that this difference occurs because the transition of the
corresponding pure system is second order for q=3 but first order for q=24.Comment: 9 pages, 13 figures, final published versio
New algorithm and results for the three-dimensional random field Ising Model
The random field Ising model with Gaussian disorder is studied using a new
Monte Carlo algorithm. The algorithm combines the advantanges of the replica
exchange method and the two-replica cluster method and is much more efficient
than the Metropolis algorithm for some disorder realizations. Three-dimensional
sytems of size are studied. Each realization of disorder is simulated at
a value of temperature and uniform field that is adjusted to the phase
transition region for that disorder realization. Energy and magnetization
distributions show large variations from one realization of disorder to
another. For some realizations of disorder there are three well separated peaks
in the magnetization distribution and two well separated peaks in the energy
distribution suggesting a first-order transition.Comment: 24 pages, 23 figure
Surrender, catch and the imp of fieldwork
We build on the work of Kurt Wolff to capture some distinctive aspects of ethnographic fieldwork. Drawing on the sociology of knowledge and phenomenology, Wolff introduced and developed the idea of surrender-and-
catch in order to encapsulate the twin processes of engagement and reflection. We extend the idea to incorporate what we call the 'impsâ of ethnographic fieldwork. For neither surrender nor catch are themselves
predictable or perfectly under the ethnographerâs control. While fieldwork is itself unpredictable, there may be many unanticipated âcatchesâ. Moreover, there is often an ethnographic âimpâ that intrudes itself, questioning the
very desirability or good sense of the fieldwork itself. The imps arise unbidden but can pose searching, sometimes unwelcome â though ultimately productive â questions. We illustrate the paper from a brief fieldwork encounter with the world of studio photography
European Union enlargement, post-accession migration and imaginative geographies of the âNew Europeâ: media discourses in Romania and the United Kingdom.
This paper is concerned with re-imaginings of âEuropeâ following the accession to the European Union (EU) of former âEastern Europeanâ countries. In particular it explores media representations of post-EU accession migration from Romania to the United Kingdom in the UK and Romanian newspaper press. Todorovaâs (1997) notion of Balkanism is deployed as a theoretical construct to facilitate the analysis of these representations as first, the continuation of long-standing and deeply embedded imaginings of the âEastâ of Europe and, second, as a means of contesting these discourses. The paper explores the way in which the UK press construct Balkanist discourses about Romania and Romanian migrants, and then analyses how the Romanian press has contested such discourses. The paper argues that the idea of the âEastâ remains important in constructing notions of âEuropeâ within popular media geographies
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Comparing serial X-ray crystallography and microcrystal electron diffraction (MicroED) as methods for routine structure determination from small macromolecular crystals.
Innovative new crystallographic methods are facilitating structural studies from ever smaller crystals of biological macromolecules. In particular, serial X-ray crystallography and microcrystal electron diffraction (MicroED) have emerged as useful methods for obtaining structural information from crystals on the nanometre to micrometre scale. Despite the utility of these methods, their implementation can often be difficult, as they present many challenges that are not encountered in traditional macromolecular crystallography experiments. Here, XFEL serial crystallography experiments and MicroED experiments using batch-grown microcrystals of the enzyme cyclophilin A are described. The results provide a roadmap for researchers hoping to design macromolecular microcrystallography experiments, and they highlight the strengths and weaknesses of the two methods. Specifically, we focus on how the different physical conditions imposed by the sample-preparation and delivery methods required for each type of experiment affect the crystal structure of the enzyme
Scaling and self-averaging in the three-dimensional random-field Ising model
We investigate, by means of extensive Monte Carlo simulations, the magnetic
critical behavior of the three-dimensional bimodal random-field Ising model at
the strong disorder regime. We present results in favor of the two-exponent
scaling scenario, , where and are the
critical exponents describing the power-law decay of the connected and
disconnected correlation functions and we illustrate, using various finite-size
measures and properly defined noise to signal ratios, the strong violation of
self-averaging of the model in the ordered phase.Comment: 8 pages, 6 figures, to be published in Eur. Phys. J.
Chirality scenario of the spin-glass ordering
Detailed account is given of the chirality scenario of experimental
spin-glass transitions. In this scenario, the spin glass order of weakly
anisotropic Heisenberg-like spin-glass magnets including canonical spin glasses
are essentially chirality driven. Recent numerical and experimental results are
discussed in conjunction with this scenario.Comment: Submitted to J. Phys. Soc. Japan "Special Issue on Frustration
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