1,946,872 research outputs found
Precision Measurement of the Mass Difference
We have measured the vector-pseudoscalar mass splitting , significantly more precise than the previous
world average. We minimize the systematic errors by also measuring the
vector-pseudoscalar mass difference using the radiative
decay , obtaining
. This is
then combined with our previous high-precision measurement of
, which used the decay . We also
measure the mass difference MeV, using the
decay modes of the and mesons.Comment: 18 pages uuencoded compressed postscript (process with uudecode then
gunzip). hardcopies with figures can be obtained by sending mail to:
[email protected]
Myoclonus-dystonia : distinctive motor and non-motor phenotype from other dystonia syndromes
Background: myoclonus-dystonia (M-D) due to a pathogenic variant of SGCE is an autosomal dominant inherited movement disorder. Apart from motor symptoms, psychiatric disorders are highly prevalent in patients with MD. Previous studies suggest, but never tested directly, that the type of psychiatric disorder differs between dystonia syndromes, probably related to disease specific pathology. Little is known about other non-motor symptoms (NMS) in M.D. Here, we systematically study NMS in M-D in direct comparison to other types of dystonia and healthy controls. Methods: Standardized questionnaires were used to assess type and severity of psychiatric co-morbidity, sleep problems, fatigue and quality of life. Results of M-D patients with a pathogenic variant of SGCE were compared to results of idiopathic cervical dystonia (CD) patients, dopa-responsive dystonia (DRD) patients with a pathogenic variant of GCH1 and controls. Results: We included 164 participants: 41 M-D, 51 CD, 19 DRD patients, 53 controls. Dystonia patients (M-D, CD and DRD) had an increased prevalence of psychiatric disorders compared to controls (56-74% vs. 29%). In M-D we found a significantly increased prevalence of obsessive-compulsive disorder (OCD) and psychosis compared to CD and DRD. All dystonia patients had more sleep problems (49-68% vs. 36%) and fatigue (42-73% vs. 15%) than controls. Compared to other dystonia subtypes, M-D patients reported less excessive daytime sleepiness and fatigue. Conclusion: Psychiatric comorbidity is frequent in all dystonia types, but OCD and psychosis are more common in M-D patients. Further research is necessary to elucidate underlying pathways
Partial stratification of secant varieties of Veronese varieties via curvilinear subschemes
We give a partial "quasi-stratification" of the secant varieties of the order
Veronese variety of . It covers the set
of all points lying on the linear span of
curvilinear subschemes of , but two "quasi-strata" may overlap. For
low border rank two different "quasi-strata" are disjoint and we compute the
symmetric rank of their elements. Our tool is the Hilbert schemes of
curvilinear subschemes of Veronese varieties. To get a stratification we attach
to each the minimal label of a quasi-stratum
containing it.Comment: 16 page
FPS-SFT: A Multi-dimensional Sparse Fourier Transform Based on the Fourier Projection-slice Theorem
We propose a multi-dimensional (M-D) sparse Fourier transform inspired by the
idea of the Fourier projection-slice theorem, called FPS-SFT. FPS-SFT extracts
samples along lines (1-dimensional slices from an M-D data cube), which are
parameterized by random slopes and offsets. The discrete Fourier transform
(DFT) along those lines represents projections of M-D DFT of the M-D data onto
those lines. The M-D sinusoids that are contained in the signal can be
reconstructed from the DFT along lines with a low sample and computational
complexity provided that the signal is sparse in the frequency domain and the
lines are appropriately designed. The performance of FPS-SFT is demonstrated
both theoretically and numerically. A sparse image reconstruction application
is illustrated, which shows the capability of the FPS-SFT in solving practical
problems
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