منابع مشابه
Ab initio compressive phase retrieval
Any object on earth has two fundamental properties: it is finite, and it is made of atoms. Structural information about an object can be obtained from diffraction amplitude measurements that account for either one of these traits. Nyquist-sampling of the Fourier amplitudes is sufficient to image single particles of finite size at any resolution. Atomic resolution data is routinely used to image...
متن کاملUndersampled Phase Retrieval via Majorization-Minimization
In the undersampled phase retrieval problem, the goal is to recover an N -dimensional complex signal x from only M < N noisy intensity measurements without phase information. This problem has drawn a lot of attention to reduce the number of required measurements since a recent theory established that M ≈ 4N intensity measurements are necessary and sufficient to recover a generic signal x. In th...
متن کاملUndersampled Phase Retrieval with Outliers: Supplementary Material
which set to zero yields the minimizer u− = s η + d. The minimization of f+(u) or f−(u) along the curve on which both functions are equal-valued, involves parameterizing this curve and minimizing f+(u) as a function of this parameter. These functions are equal when |u|2− y = y+ |s|2− 2|s|Re{ue}, which corresponds to the circle |u+ s|2 = 2(y+ |s|2). The parameterization then corresponds to the a...
متن کاملPhase retrieval for undersampled broadband images
Phase-retrieval algorithms have been used for wave-front sensing to determine the aberrations of an optical system from system point-spread functions (blurred images of point sources). Previously, computationally efficient algorithms were developed and applied to data from the Hubble Space Telescope [Appl. Opt. 32, 1737 (1993); Appl. Opt. 32, 1747 (1993)], but those algorithms, which employ ana...
متن کاملRecent ab initio phase diagram studies: Iridium
The phase diagram of iridium is investigated using the Z methodology in conjunction with the VASP ab initiomolecular dynamics package. The Z methodology is a novel technique for phase diagram studies which combines the direct Z method for the computation of melting curves and the inverse Z method for the calculation of solid-solid phase boundaries. We compare our results to the available experi...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Microscopy and Microanalysis
سال: 2009
ISSN: 1431-9276,1435-8115
DOI: 10.1017/s1431927609099620