We study 1D discrete Schrödinger operators H with integer-valued potential and show that, (i), invertibility (in fact, even just Fredholmness) of always implies its half-line compression H+ (zero Dirichlet boundary condition, i.e. matrix truncation). In particular, the eigenvalues avoid zero – all other integers. use this result to conclude (ii), finite section method (approximate inversion via...

Atomically thin topological materials are attracting growing attention for their potential to radically transform classical and quantum electronic device concepts. Among them is the spin Hall (QSH) insulator—a 2D state of matter that arises from interplay band inversion strong spin–orbit coupling, with large tunable bulk bandgaps up 800 meV gapless, 1D edge states. Reviewing recent advances in ...

this paper describes the application of approximate methods to invert airborne magnetic data as well as helicopter-borne frequency domain electromagnetic data in order to retrieve a joint model of magnetic susceptibility and electrical resistivity. the study area located in semnan province of iran consists of an arc-shaped porphyry andesite covered by sedimentary units which may have potential ...

Two deuteriumed quasi-one-dimensional (quasi-1D) spin-Peierls-type compounds, 4-X-benzylpyridinium-d(5) bis(maleo-nitriledithiolato)nickelate (the substituent X = Br or Cl), were structurally characterized. Compared with the corresponding non-deuteration compounds, the transition temperature T(C) shifts to higher temperature. The isotopic effect of countercations on T(C) is probably related to ...

Purification of the n-BuOH fraction of the aqueous alcoholic extract from the roots of Phytolacca americana resulted in the isolation of two triterpene saponins named esculentoside B (1), and esculentoside A (2). The structures of isolated compounds were characterized on the basis of extensive spectral data (1D and 2D NMR; and MS) and in comparison with their Nuclear Magnetic Resonance (NMR) an...

Bioassay-guided isolation of the CH(2)Cl(2)/MeOH extract from the Australian sponge Iotrochota sp. resulted in the purification of two new N-cinnamoyl-amino acids, iotrochamides A (1) and B (2). The chemical structures of 1 and 2 were determined by 1D/2D NMR and MS data analyses. Compounds 1 and 2 were shown to inhibit Trypanosoma brucei brucei with IC(50) values of 3.4 and 4.7 μM, respectively.

this paper presents results of applying a new approach on 2d inversion of magnetotelluric (mt) data in order to enhance resolution and stability of the inversion results. due to non-linearity and limited coverage of data acquisition in an mt field campaign, minimizing the error by linearization of the problem in least squares inversion usually leads to an ill-posed problem. in general, an inver...

Results of protein sequence comparison at open criterion show a very large number of relationships that have, up to now, gone unreported. The relationships suggest many ancient events of gene duplication. It is well known that gene duplication has been a major process in the evolution of genomes. A collection of human genes that have known functions have been examined for a history of gene dupl...

Aim: Deaths resulted from burn injuries constitute a serious public health problem in developing countries. Deaths from burn injuries are usually seen secondary to accidents and more frequently occur in chidhood. In this study; we intended to indicate the features of childhood deaths resulted from burn injuries and the causes of burns in Diyarbakir city. Methods: The corpse examination and auto...

We investigate the delocalization and conductance quantization in finite onedimensional chains with only off-diagonal disorder coupled to leads. It is shown that the appearence of delocalized states at the middle of the band under correlated disorder is strongly dependent upon the even-odd parity of the number of sites in the system. In samples with inversion symmetry the conductance equals 2e/...