Some new coordination compounds of tin(IV) having general formula [SnBu2 (L)2 ] (where L = carbohydrazone ligand) have been synthesized by the reaction of dibutyltin oxide with carbohydrazone ligands with the ratio of 1:2 (metal- ligand) using dry benzene as a reaction medium. The newly synthesized complexes were characterized by elemental analysis, molecular weight determinations, conductivity...

This article presents an analysis of free vibration of elastically supported Timoshenko beams by using the spectral element method. The governing partial differential equation is elaborated to formulate the spectral stiffness matrix. Effectively, the non classical end boundary conditions of the beam are the primordial task to calibrate the phenomenon of the Timoshenko beam-soil foundation inter...

Content description has become a topic of interest for many researchers in the audiovisual field [1][2]. While manual annotation has been used for many years in different applications, the focus now is on finding automatic contentextraction and content-navigation tools. An increasing number of projects, in some of which we are actively involved, focus on the extraction of meaningful features fr...

1- introduction this research attempts to investigate the effects of forensically-relevant facial concealment on voiceless fricatives /f, s, ʃ/ in farsi. there are various types of face-concealing garments that are commonly worn by people for the occupational, recreational, religious, and cultural purposes .these coverings may be typically used as disguises during the commission of crime by del...

Gap filling and noise reduction of unevenly sampled data by means of the Lomb-Scargle periodogram K. Hocke and N. Kämpfer Institute of Applied Physics, University of Bern, Switzerland Received: 25 January 2008 – Accepted: 4 February 2008 – Published: 4 March 2008 Correspondence to: K. Hocke ([email protected]) Published by Copernicus Publications on behalf of the European Geoscience...

This paper suggests the application of advanced methods from Fourier Analysis in order to describe ultra-high frequent data in limit order books. Using Lomb’s normalized periodogram and Scargle’s Discrete Fourier Transforms to take account of the irregularity in spacing, the power spectra of different time series processes can be easily estimated, without immense computational effort caused by ...

Levelling is the most precise technique for height difference measurements in geomatics engineering. Various systematic errors affect precise levelling observations and reduce the precision of the observed height differences. This study investigates digital levels residual compensator error and observational method for its elimination. For this purpose the levelling data, which was collected wi...

We propose a spectral clustering method based on local principal components analysis (PCA). After performing local PCA in selected neighborhoods, the algorithm builds a nearest neighbor graph weighted according to a discrepancy between the principal subspaces in the neighborhoods, and then applies spectral clustering. As opposed to standard spectral methods based solely on pairwise distances be...

The properties of periodized Daubechies wavelets on 0; 1] are detailed and contrasted against their counterparts which form a basis for L 2 (R). Numerical examples illustrate the analytical estimates for convergence and demonstrate by comparison with Fourier spectral methods the superiority of wavelet projection methods for approximations. The analytical solution to inner products of periodized...