QCD Tests in Proton-Antiproton Collisions

We review the status of QCD tests in high energy p-pbar collisions. Contents: i) Introduction ii) QCD in Hadronic Collisions iii) Jet Production iv) Heavy Flavour Production v) W and Z Production vi) Direct Photons.Comment: 30 pages + 26 figs (available upon request), IFUP-TH 4/93, Fermilab-PUB-93/19-E, to appear in Annual Review of Nuclear and Particle Science, vol 4

Kinematic Differences between Land and Shallow-water Sprinting

Previous studies have demonstrated the efficacy of using aquatic-based (AB) running when compared to land-based (LB) running to produce similar gains. However, most studies have primarily focused on deep-water running styles rather than shallow-water sprinting. Purpose: To compare lower extremity running kinematics of female college athletes in an AB shallow water sprinting environment and in a LB sprinting environment. Methods: 15 female NCAA Division III athletes completed this investigation. Each subject participated in a shallow-water sprinting familiarization session and completed both AB and LB sprinting tests. All trials were video recorded from the right sagittal view. Results: T-test pairwise comparisons revealed significant differences between LB sprinting and AB sprinting. Stride rates (SR) (p Conclusion: These data revealed that the AB sprinting style was found to have significant lower extremity kinematic differences when compared to the LB sprinting style for all of the kinematic variables that were measured with the exception of SLS and SW. The differences exhibited are due to fluid mechanics, e.g. drag, buoyancy, and hydrostatic pressure. However, the data assists with the understanding of the differences associated with sprinting in different media

Integrated source and channel encoded digital communications system design study

Studies on the digital communication system for the direct communication links from ground to space shuttle and the links involving the Tracking and Data Relay Satellite (TDRS). Three main tasks were performed:(1) Channel encoding/decoding parameter optimization for forward and reverse TDRS links,(2)integration of command encoding/decoding and channel encoding/decoding; and (3) modulation coding interface study. The general communication environment is presented to provide the necessary background for the tasks and to provide an understanding of the implications of the results of the studies

High frequency correlation modelling

Many statistical arbitrage strategies, such as pair trading or basket trading, are based on several assets. Optimal execution routines should also take into account correlation between stocks when proceeding clients orders. However, not so much effort has been devoted to correlation modelling and only few empirical results are known about high frequency correlation. We develop a theoretical framework based on correlated point processes in order to capture the Epps effect in section 1. We show in section 2 that this model converges to correlated Brownian motions when moving to large time scales. A way of introducing non-Gaussian correlations is also discussed in section 2. We conclude by addressing the limits of this model and further research on high frequency correlation.

Efficient, sparse representation of manifold distance matrices for classical scaling

Geodesic distance matrices can reveal shape properties that are largely invariant to non-rigid deformations, and thus are often used to analyze and represent 3-D shapes. However, these matrices grow quadratically with the number of points. Thus for large point sets it is common to use a low-rank approximation to the distance matrix, which fits in memory and can be efficiently analyzed using methods such as multidimensional scaling (MDS). In this paper we present a novel sparse method for efficiently representing geodesic distance matrices using biharmonic interpolation. This method exploits knowledge of the data manifold to learn a sparse interpolation operator that approximates distances using a subset of points. We show that our method is 2x faster and uses 20x less memory than current leading methods for solving MDS on large point sets, with similar quality. This enables analyses of large point sets that were previously infeasible.Comment: Conference CVPR 201

The Gastrostomy Feeding Button™

The button™ feeding device replaces conventional long-term gastrostomy feeding tubes. Health care professionals can educate parents on maintenance of the button and provide them with emotional support