Analytic continuation (AC) from the imaginary-time Green's function to spectral is a crucial process for numerical studies of dynamical properties quantum many-body systems. This process, however, an ill-posed problem; that is, obtained spectrum unstable against noise function. Though several methods have been developed, each them has its own advantages and disadvantages. The sparse modeling (S...

We construct stable, accurate and efficient numerical schemes for wave propagation and flow problems posed on spatial geometries that are moving, deforming, erroneously described or non-simply connected. The schemes are on Summation-by-Parts (SBP) form, combined with the Simultaneous Approximation Term (SAT) technique for imposing initial and boundary conditions. The main analytical tool is the...

Online measurement of milling force is very important for machining process monitoring and control. In practice, it difficult to measure the directly during process. This paper develops a method identification called least square QR-factorization with fast stopping criterion (FSC-LSQR) method, queue buffer structure (QBS) employed online using acceleration signals. The convolution integral sign...