36,439 research outputs found
Elastic and plastic analysis of pressure vessel weld lands with mismatch
Elastic and plastic analysis of pressure vessel weld lands with mismatc
Elastic and plastic stresses at weld sinkages and other discontinuities in pressure vessels
Mismatch and weld sinkage problems of pressure vessel geometric discontinuities studied in design graphs and test progra
Non-Universal Gaugino Masses, CDMS, and the LHC
We consider the possibility that the recently reported events at the CDMS-II
direct dark matter detection experiment are the result of coherent scattering
of supersymmetric neutralinos. In such a scenario we argue that non-universal
soft supersymmetry breaking gaugino masses are favored with a resulting
lightest neutralino with significant Higgsino and wino components. We discuss
the accompanying signals which must be seen at liquid-xenon direct detection
experiments and indirect detection experiments if such a supersymmetric
interpretation is to be maintained. We illustrate the possible consequences for
early discovery channels at the LHC via a set of benchmark points designed to
give rise to an observed event rate comparable to the reported CDMS-II data.Comment: Typos corrected and references adde
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A multi-spacecraft reanalysis of the atmosphere of Mars
We have conducted a nine-Mars Year (MY) consistent reanalysis of the martian atmosphere covering the period MY 24–32 and making use of data from three different spacecraft. Remotely-sensed measurements of temperature, dust opacity, water ice and ozone from NASA’s Mars Global Surveyor (MGS) and Mars Recconaisance Orbiter (MRO) and ESA’s Mars Express (MEx) were assimilated [1] into a single model simulation, sampled two-hourly over the whole period. This forms a large, regular reanalysis dataset that is being made publicly available as an output of the EU UPWARDS project. The same analysis technique, with an improved model and higher resolution will be conducted with ESA Trace Gas Orbiter (TGO) data as it becomes available
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Trace gas assimilation of Mars orbiter observations
Ozone, water vapour and argon are minor constituents in the Martian atmosphere, observations of which can be of use in constraining atmospheric dynamical and physical processes. This is especially true in the winter season of each hemisphere, when the bulk of the main constituent in the atmosphere (CO2 ) condenses in the polar regions shifting the balance of atmospheric composition to a more trace gas rich air mass.
Current Mars Global Circulation Models (MGCMs) are able to represent the photochemistry occuring in the atmosphere, with constraints being imposed by comparisons with observations. However, a long term comparison using data assimilation provides a more robust constraint on the model. We aim to provide a technique for trace gas data assimilation for the analysis of observations from current and future satellite missions (such as ExoMars) which observe the spatial and temporal distribution of trace gases on Mars
Micro-Engineered Devices for Motion Energy Harvesting
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Conjugative transfer frequencies of mef(A)-containing Tn1207.3 to macrolide-susceptible Streptococcus pyogenes belonging to different emm types
The aim of this study was to examine the gene transfer potential of mef(A)-containing Tn120.3 to macrolide-susceptible Streptococcus pyogenes belonging to different emm types. Using the filter mating technique, Tn1207.3 was transferred by conjugation to 23 macrolide-susceptible recipients representing 11 emm types. PCR analysis confirmed the presence of the mef(A) gene and the comEC junction regions of the Tn1207.3 insertion in resultant transconjugants. Significant variation was found in the transfer frequency of Tn1207.3 to different Strep. pyogenes strains, and this phenomenon may contribute to the differences in mef(A) frequency observed among clinical isolates. Significance and Impact of the Study: The spread of antimicrobial resistance among pathogenic bacteria is an important problem, but the mechanisms of horizontal transfer between strains and species are often poorly understood. For instance, little is known on how macrolide resistance spreads between strains of the human pathogen Strep. pyogenes and why certain strains more commonly display resistance than others. Here, we show that Strep. pyogenes strains vary greatly in their ability to acquire a transposon encoding macrolide resistance by horizontal gene transfer in vitro. These data provide a novel insight into the transfer of antibiotic resistance between bacterial strains and offer an explanation for the differences in the frequency of resistance determinates and resistance seen among clinical isolates. © 2014 The Authors Letters in Applied Microbiology
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