By means of the time-dependent density-matrix renormalization-group (TDMRG) method we are able to follow the real-time dynamics of a single impurity embedded in a one-dimensional bath of interacting bosons. We focus on the impurity breathing mode, which is found to be well described by a single oscillation frequency and a damping rate. If the impurity is very weakly coupled to the bath, a Lutti...

A specific HS-GC method has been developed, optimized, and validated for the determination of genotoxic impurity Bromoethane in Vigabatrin (VGB) drug substance. Chromatographic separation was achieved on DB-1 column (30 m × 0.53 mm, 5.0 μm), consists 100% dimethyl polysiloxane as stationary phase passing nitrogen carrier gas. The performance assessed by evaluating specificity, linearity, sensit...

Using a gradient-corrected density functional method, we studied computationally how single impurity atoms affect the structure and the properties of a Ni4 cluster. H and O atoms coordinate at a Ni-Ni bond, inducing small changes to the structure of bare Ni4 which is essentially a tetrahedron. For a C impurity, we found three stable structures at a Ni4 cluster. In the most stable geometry, the ...

trans-Ketoconazole was identified and quantified as impurity of cis-ketoconazole, an antifungal compound, by capillary zone electrophoresis-electrospray-mass spectrometry (CZE-ESI-MS). The chirality of this impurity was demonstrated separating their enantiomers by adding heptakis-(2,3,6-tri-O-methyl)-beta-cyclodextrin to the separation buffer in capillary electrophoresis (CE) with UV detection....

Tokamak has toroidal symmetry and symmetry breaking via application of non-axisymmetric field produces disccipation of toroidal momentum by NTV [1] and produces offset toroidal rotation [2]. Callen explained NTV physics and origin of offset toroidal rotation plainly without impurity [3] and with impurity [4]. For impurity, same toroidal rotation for ion and impurity is assumed in [4], which is ...

Amlodipine maleate is a maleate salt of 3-ethyl 5-methyl 2-[(2-aminoethoxy)methyl]-4-(2chlorophenyl)-6-methyl-1,4-dihydropyridine-3,5-dicarboxylate. An unknown impurity at m /z 392.2 for [M+H] ion has been detected during the accelerated stability analysis (40 °C /75 % RH) of amlodipine maleate drug substance by reverse-phase high performance liquid chromatography–mass spectrometry (RP-HPLC-MS)...

In this paper we study the effect of impurity scattering on the performance of a Si gate-all-around nanowire transistors. The non-equilibrium Green function formalism is used in order to describe the carrier transport. Impurity scattering is introduced using two different formalisms, one that considers the impurity potential as a small perturbation by introducing self energies and the other in ...

Tunneling conductance spectra between a normal metal / d-wave superconductor junction under the presence of bulk impurities in the superconductor are studied. The quasiclassical theory has been applied to calculate the spatial variation of the pair potential and the effect of impurity scattering has been introduced by t-matrix approximation. The magnitude of a subdominant s-wave component at th...

In ordinary metals, antiferromagnetic exchange between conduction electrons and a magnetic impurity leads to screening of the impurity spin below the Kondo temperature, TK . In systems such as semimetals, small-gap semiconductors and unconventional superconductors, a reduction in available conduction states near the chemical potential can greatly depress TK . The behavior of an Anderson impurit...

Using bosonization and path-integral methods, we study general low-temperature behavior of nonmagnetic and magnetic impurity scattering in Tomonaga-Luttinger liquid, and calculate the electron Green function for a general backward scattering potential. We demonstrate that the electron density of state near the impurity site is suppressed by backward scattering, but it mainly remains invariant f...