PURPOSE Kienböck disease is characterized by avascular necrosis of the lunate bone, which is usually progressive without treatment. This study examined lunate core decompression for its treatment potential. METHODS We surgically treated 20 patients with stage 1 to 3b Kienböck disease with lunate core decompression. We evaluated pain, range of motion, functional disability, and radiographic in...

Linear least-squares regression with a “design” matrix A approximates a given matrix B via minimization of the spectralor Frobenius-norm discrepancy ‖AX − B‖ over every conformingly sized matrix X. Another popular approximation is low-rank approximation via principal component analysis (PCA) — which is essentially singular value decomposition (SVD) — or interpolative decomposition (ID). Classic...

Barchans are dunes of high mobility which have a crescent shape and propagate under conditions of unidirectional wind. However, sand dunes only appear above a critical size, which scales with the saturation distance of the sand flux [P. Hersen, S. Douady, and B. Andreotti, Phys. Rev. Lett. 89, 264301 (2002); B. Andreotti, P. Claudin, and S. Douady, Eur. Phys. J. B 28, 321 (2002); G. Sauermann, ...

to assess seismic hazard, it is essential to estimate the potential seismicity, particularly estimation of size of the largest earthquake that can be identified by a distinct fault or earthquake source. one of the methods applied to estimate magnitude of earthquake is use of empirical relationships between magnitude and fault parameters. fault parameters for the earthquakes from early instrumen...