1,855 research outputs found
Robotic Resistance Treadmill Training Improves Locomotor Function in Children With Cerebral Palsy: A Randomized Controlled Pilot Study
Objective To determine whether applying controlled resistance forces to the legs during the swing phase of gait may improve the efficacy of treadmill training as compared with applying controlled assistance forces in children with cerebral palsy (CP). Design Randomized controlled study. Setting Research unit of a rehabilitation hospital. Participants Children with spastic CP (N=23; mean age, 10.6y; range, 6â14y; Gross Motor Function Classification System levels, IâIV). Interventions Participants were randomly assigned to receive controlled assistance (n=11) or resistance (n=12) loads applied to the legs at the ankle. Participants underwent robotic treadmill training 3 times a week for 6 weeks (18 sessions). A controlled swing assistance/resistance load was applied to both legs starting from the toe-off to mid-swing phase of gait during training. Main Outcome Measures Outcome measures consisted of overground walking speed, 6-minute walk distance, and Gross Motor Function Measure scores and were assessed pre and post 6 weeks of training and 8 weeks after the end of training. Results After 6 weeks of treadmill training in participants from the resistance training group, fast walking speed and 6-minute walk distance significantly improved (18% and 30% increases, respectively), and 6-minute walk distance was still significantly greater than that at baseline (35% increase) 8 weeks after the end of training. In contrast, overground gait speed and 6-minute walk distance had no significant changes after robotic assistance training. Conclusions The results of the present study indicated that robotic resistance treadmill training is more effective than assistance training in improving locomotor function in children with CP
QCD Corrections to SUSY Higgs Production: The Role of Squark Loops
We calculate the two-loop QCD corrections to the production of the neutral
supersymmetric Higgs bosons via the gluon fusion mechanism at hadron colliders,
including the contributions of squark loops. To a good approximation, these
additional contributions lead to the same QCD corrections as in the case where
only top and bottom quark loops are taken into account. The QCD corrections are
large and increase the Higgs production cross sections significantly.Comment: 5 pages, latex, 2 figure
Effects of SUSY-QCD in hadronic Higgs production at next-to-next-to-leading order
An estimate of the NNLO supersymmetric QCD effects for Higgs production at
hadron colliders is given. Assuming an effective gluon-Higgs interaction, these
corrections enter only in terms of process-independent, factorizable terms. We
argue that the current knowledge of these terms up to NLO is sufficient to
derive the NNLO hadronic cross section within the limitations of the standard
theoretical uncertainties arising mainly from renormalization and factorization
scale variations. The SUSY contributions are small with respect to the QCD
effects, which means that the NNLO corrections to Higgs production are very
similar in the Standard Model and the MSSM.Comment: LaTeX, 5 pages, 3 embedded PostScript figure
HIGGS BOSON PRODUCTION AT THE LHC
Gluon fusion is the main production mechanism for Higgs particles at the LHC.
We present the QCD corrections to the fusion cross sections for the Higgs boson
in the Standard Model, and for the neutral Higgs bosons in the minimal
supersymmetric extension of the Standard Model. The QCD corrections are in
general large and they increase the cross sections significantly. In two steps
preceding the calculation of the production processes, we determine the QCD
radiative corrections to Higgs decays into two photons and gluons.Comment: 82 pages, latex, 26 figures (not included, available upon request
Next-to-leading order jet distributions for Higgs boson production via weak-boson fusion
The weak-boson fusion process is expected to provide crucial information on
Higgs boson couplings at the Large Hadron Collider at CERN. The achievable
statistical accuracy demands comparison with next-to-leading order QCD
calculations, which are presented here in the form of a fully flexible parton
Monte Carlo program. QCD corrections are determined for jet distributions and
are shown to be modest, of order 5 to 10% in most cases, but reaching 30%
occasionally. Remaining scale uncertainties range from order 5% or less for
distributions to below +-2% for the Higgs boson cross section in typical
weak-boson fusion search regions.Comment: 19 pages, 8 figure
Top quark associated production of topcolor pions at hadron colliders
We investigate the associated production of a neutral physical pion with top
quarks in the context of topcolor assisted technicolor. We find that single-top
associated production does not yield viable rates at either the Tevatron or
LHC. tt-associated production at the Tevatron is suppressed relative to
Standard Model ttH, but at the LHC is strongly enhanced and would allow for
easy observation of the main decay channels to bottom quarks, and possible
observation of the decay to gluons.Comment: 13 pages, 4 figures, submitted to PR
Endoscopic Proximal Adductor Lengthening for Chronic Adductor-Related Groin Pain
© 2018 Arthroscopy Association of North America Proximal adductor injuries are relatively common groin injuries in athletes. Various tenotomy techniques have been described including open, partial, and percutaneous approaches. Current techniques help most athletes return to sport; however, many develop adductor weakness. Moreover, the procedures lack full visualization of the tendon and do not allow for return to athletesâ preinjury level of play. We describe an endoscopic z-lengthening of the proximal adductor tendon with the potential to minimize complications associated with open procedures such as incisional pain and neurovascular injury while affording a more complete tenotomy than current percutaneous techniques. This is a safe and reproducible technique that allows for release of tension as a result of pathologic adductor tendon pathologies
Finite-top-mass effects in NNLO Higgs production
We construct an accurate approximation to the exact NNLO cross section for
Higgs production in gluon-gluon fusion by matching the dominant finite top mass
corrections recently computed by us to the known result in the infinite mass
limit. The ensuing corrections to the partonic cross section are very large
when the center of mass energy of the partonic collision is much larger than
the Higgs mass, but lead to a moderate correction at the percent level to the
total Higgs production cross section at the LHC. Our computation thus reduces
the uncertainty related to these corrections at the LHC from the percent to the
per mille level.Comment: 4 pages, 4 figures; to be published in the proceedings of QCD2008.
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