Algebraic approach to the spectral problem for the Schroedinger equation with power potentials

The method reducing the solution of the Schroedinger equation for several types of power potentials to the solution of the eigenvalue problem for the infinite system of algebraic equations is developed. The finite truncation of this system provides high accuracy results for low-lying levels. The proposed approach is appropriate both for analytic calculations and for numerical computations. This method allows also to determine the spectrum of the Schroedinger-like relativistic equations. The heavy quarkonium (charmonium and bottomonium) mass spectra for the Cornell potential and the sum of the Coulomb and oscillator potentials are calculated. The results are in good agreement with experimental data.Comment: 17 pages, including 6 PostScript figures (epsf style

InorgMat1302018VerbetskiiLO.fm

Abstract-We have studied the interaction of hydrogen with vanadium-chromium alloys. Hydrogen absorp tion and desorption isotherms have been constructed, the stability ranges of the forming hydride phases have been determined, and the ΔH and ΔS of the reactions involved have been evaluated. X ray diffraction char acterization results indicate the formation of three hydride phases, with fcc, bcc, and hcp structures

FUNCTIONAL RESULTS OF SURGICAL TREATMENT FOR ISTHMIC SPONDYLOLISTHESIS USING ANTERIOR AND POSTERIOR EXPOSURES

Objective - to compare results of spondylolisthesis treatment using different surgical technologies. Material and methods: 84 patients (aged from 19 till 67) with spondylolisthesis of 1-3 degree (H.W Meyerding) were operated. Two methods of surgical exposures were used for decompression and stabilization. Anterior decompression and stabilization exposures from retroperitoneal access were used for the first group of patients. The second group was operated using posteriolateral interbody fusion with transpedicular screw fixation. The following results were estimated after operation: the level of patients’ postoperative adaptation period and the rate of neurological and orthopedic rehabilitation during the postoperative period. Conclusions. The obtained functional results show no difference for both groups where posterior and anterior exposures were used for spondylolisthesis surgical treatment of 1-3 degree

SPINAL CORD STIMULATION IN TREATMENT OF THE NEUROPATHIC PAIN SYNDROMES: INITIAL EXPERIENCE

In the article initial experience of spinal cord stimulation for chronic pain syndromes is described. The trial was done for 62 patients, in 52 cases trial was successful and subcutaneous pulse generator were implanated. Maximal follow-up is 26 months. The level of pain evaluates at VAS. Permanent pain-relieve results were achieved in 46 patients (74,2%). These results correspond to literature data