-The numerical properties of implementations of the cessing/systolic arrays and/or VLSI chiprecursive least-squares identification algorithm are of grea t implementation. importance for their continuous use in various adaptive schemes. Here we investigate how an error that is introduced at an (d) Programming investment required. arbitrary point in the algorithm propagates. It is shown that (e) ...

Angular momentum transfer from a rotating stellar bar has been proposed by Weinberg & Katz (2002) as a mechanism to destroy dark-matter cusps in a few rotation periods. The N-body simulations performed by these authors in support of their claim employed spherical harmonics for the force computation and were, as shown by Sellwood (2003), very sensitive to inclusion of asymmetric terms (odd l,m)....

Several authors have recently considered a parallel method for solving sparse triangular systems with many right-hand sides. The method employs a partition into sparse factors of the product form of the inverse of the coefficient matrix. It is shown here that while the method can be unstable, stability is guaranteed if a certain scalar that depends on the matrix and the partition is small and t...

In the radial flow of gas into a black hole (i.e. Bondi accretion), the infall of any entropy or vorticity perturbation produces acoustic waves propagating outward. The dependence of this acoustic flux on the shape of the perturbation is investigated in detail. This is the key process in the mechanism of the entropic-acoustic instability proposed by Foglizzo& Tagger (2000) to explain the instab...

atrial fibrillation (af) is the most common arrhythmia after cardiothoracic surgery. af following coronary artery bypass graft (cabg) is associated with an increase in morbidity, mortality, hemodynamic instability, thromboembolic events, severity of heart failure and icu and hospital stay. corticosteroids have a variety of beneficial effects on recovery after elective surgery. this study was de...

OBJECTIVE To describe the clinical management of recurrent shoulder instability in a professional hockey player by using chiropractic management and rehabilitation exercises. CLINICAL FEATURES A 23-year-old professional hockey player with recurrent left shoulder pain and instability. He had two previous unsuccessful shoulder operations to correct the instability. He reported that the shoulder...

The capillary instability of liquid crystalline (LC) jets is considered in the framework of linear hydrodynamics of uniaxial nematic LC. The free boundary conditions of the problem are formulated in terms of mean surface curvature H and Gaussian surface curvature G. The static version of capillary instability is shown to depend on the elasticity modulus K, surface tension σ0, and radius r0 of t...

to evaluate off-label and off-nccn guidelines uses of antineoplastic drugs in a major chinese hospital.totally 1122 patients were selected from july to december 2011. then, the off-label and off-nccn guidelines uses of antineoplastic drugs were analyzed.in 798 of 1122 patients (71.12%), drugs were used for off-label. in 317 of 1122 patients (28.25%), the drugs were prescribed for off-label and ...

A strong horizontal instability limits the maximum positron current storable in the DAFNE Phi-Factory. A powerful feedback system makes it possible to store and put in collision more than 1300 mA of positron current in 105-109 bunches. Nevertheless, a much higher current (>2.4A) has been successfully stored in the twin electron ring. Measurements have been carried out to understand the positron...

Stability of onand off-site vortex solitons with unit charge in a photorefractive optical lattice is analysed. It is shown that both types of vortex solitons are linearly unstable in the highand low-intensity regimes. In the highintensity regime, the vortex appears as a familiar ring vortex, and it suffers oscillatory instabilities. In the low-intensity regime, the vortex suffers both oscillato...