This paper presents an efficient meshless method for analyzing cracked piezoelectric structures subjected to mechanical and electrical loading. In this method, an element free Galerkin (EFG) formulation, an enriched basic function and some special shape functions that contain discontinuous derivatives are employed. Based on the moving least squares (MLS) interpolation approach, the EFG method i...

By single crystal C1-NQR Zeeman spectroscopy, the five independent C1 nuclear quadrupole coupling tensors in a-parachloral, (Cl3CCHO)3, have been studied at 24 ± 2 °C. The directions of the electric field gradient (EFG) tensor components have been determined. The principal axes are within ± 0.8° parallel to the C-Cl bond directions found by X-ray diffraction. Very small asymmetry parameters in ...

Interface compound studies on the Au-In system [1,2] have shown that Auln 2 is formed below and around room temperature. Auln2 exhibits a CaF2 structure of cubic symmetry leading to a vanishing electric field gradient (EFG) at the lattice sites. Application of the perturbed angular correlation (PAC) method to detect the other intermetallic compounds formed in the interface region at elevated te...

Local distortions in perovskite-like orthochromites are of extreme importance for the properties they exhibit. Here, we present results structural and DC magnetisation measurements combined with local probe studies polycrystalline ErCrO3. The electric field gradient (EFG) parameters’ evolution temperature shows two clear signals environment changes, one at ferroelectric phase transition (TFE) o...

Photofragmentation tunable diode laser absorption spectroscopy (PF-TDLAS) was used to simultaneously measure the concentrations of gas phase atomic potassium (K), hydroxide (KOH) and chloride (KCl) in reactor core a 140 kWth atmospheric entrained-flow gasifier (EFG). In two gasification experiments at air-to-fuel equivalence ratio 0.5, EFG first run on forest residues (FR) then an 80/20 mixture...

Z. Naturforsch. 54 a, 422-430 (1999); received March 29, 1999 Semiempirical calculations, based on the so-called angular overlap model, have been compared with ab initio methods (MP2) for the calculation of nuclear quadrupole interactions (NQPs) in cadmium complexes with biologically relevant ligands (H2O, O H , cysteinate, carboxylate, and imidazole). The assumptions on which the semiempirical...

Trends in the chlorine chemical shift (CS) tensors of amino acid hydrochlorides are investigated in the context of new data obtained at 21.1 T and extensive quantum chemical calculations. The analysis of chlorine-35/37 NMR spectra of solid L-tryptophan hydrochloride obtained at two magnetic field strengths yields the chlorine electric field gradient (EFG) and CS tensors, and their relative orie...