4,619 research outputs found
Don\u27t Repeat a Word of This!
Can you write a composition of 100 words or more without repeating a single word? Without using even an a or an an or a the more than once
Informal dramatic materials for the development of speech sounds in the primary grades
Thesis (Ed.M.)--Boston Universit
Beyond the CMSSM without an Accelerator: Proton Decay and Direct Dark Matter Detection
We consider two potential non-accelerator signatures of generalizations of
the well-studied constrained minimal supersymmetric standard model (CMSSM). In
one generalization, the universality constraints on soft supersymmetry-breaking
parameters are applied at some input scale below the grand unification
(GUT) scale , a scenario referred to as `sub-GUT'. The other
generalization we consider is to retain GUT-scale universality for the squark
and slepton masses, but to relax universality for the soft
supersymmetry-breaking contributions to the masses of the Higgs doublets. As
with other CMSSM-like models, the measured Higgs mass requires supersymmetric
particle masses near or beyond the TeV scale. Because of these rather heavy
sparticle masses, the embedding of these CMSSM-like models in a minimal SU(5)
model of grand unification can yield a proton lifetime consistent with current
experimental limits, and may be accessible in existing and future proton decay
experiments. Another possible signature of these CMSSM-like models is direct
detection of supersymmetric dark matter. The direct dark matter scattering rate
is typically below the reach of the LUX-ZEPLIN (LZ) experiment if is
close to , but may lie within its reach if
GeV. Likewise, generalizing the CMSSM to allow non-universal
supersymmetry-breaking contributions to the Higgs offers extensive
possibilities for models within reach of the LZ experiment that have long
proton lifetimes.Comment: 42 pages, 15 figure
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Assimilation of TES data from the Mars Global Surveyor scientifc mapping phase
The Thermal Emission Spectrometer (TES)aboard Mars Global Surveyor has produced data which cover almost two Martian years so far (during its scientific mapping phase). Thermal profiles for the atmosphere below 40 km and total dust opacities can be retrieved from TES nadir spectra and assimilated into a Mars general circulation model (MGCM), by using the assimilation techniques described in detail by Lewis et al. (2002). This paper describes some preliminary results from assimilations of temperature data from the period Ls=141°- 270° corresponding to late northern summer until winter solstice on Mars. Work in progress is devoted to assimilate both temperature and total dust opacity data for the full period for which they are already available
Superconducting film with randomly magnetized dots: A realization of the 2D XY model with random phase shifts
We consider a thin superconducting film with randomly magnetized dots on top
of it. The dots produce a disordered pinning potential for vortices in the
film. We show that for dots with permanent and random magnetization normal or
parallel to the film surface, our system is an experimental realization of the
two-dimensional XY model with random phase shifts. The low-temperature
superconducting phase, that exists without magnetic dots, survives in the
presence of magnetic dots for sufficiently small disorder.Comment: 5 pages, 1 figur
Crystal structure of the catalytic fragment of murine poly(ADP-ribose) polymerase-2.
Poly(ADP-ribose) polymerase-1 (PARP-1) has become an important pharmacological target in the treatment of cancer due to its cellular role as a 'DNA-strand break sensor', which leads in part to resistance to some existing chemo- and radiological treatments. Inhibitors have now been developed which prevent PARP-1 from synthesizing poly(ADP-ribose) in response to DNA-breaks and potentiate the cytotoxicity of DNA damaging agents. However, with the recent discoveries of PARP-2, which has a similar DNA-damage dependent catalytic activity, and additional members containing the 'PARP catalytic' signature, the isoform selectivity and resultant pharmacological effects of existing inhibitors are brought into question. We present here the crystal structure of the catalytic fragment of murine PARP-2, at 2.8 A resolution, and compare this to the catalytic fragment of PARP-1, with an emphasis on providing a possible framework for rational drug design in order to develop future isoform-specific inhibitors
Structural change of vortex patterns in anisotropic Bose-Einstein condensates
We study the changes in the spatial distribution of vortices in a rotating
Bose-Einstein condensate due to an increasing anisotropy of the trapping
potential. Once the rotational symmetry is broken, we find that the vortex
system undergoes a rich variety of structural changes, including the formation
of zig-zag and linear configurations. These spatial re-arrangements are well
signaled by the change in the behavior of the vortex-pattern eigenmodes against
the anisotropy parameter. The existence of such structural changes opens up
possibilities for the coherent exploitation of effective many-body systems
based on vortex patterns.Comment: 5 pages, 4 figure
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