Wyniki wyszukiwania dla: WARWICKITE VANADIUM BORATE DISTORTION FERRIMAGNETIC - MOST Wiedzy

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Wyniki wyszukiwania dla: WARWICKITE VANADIUM BORATE DISTORTION FERRIMAGNETIC

  • The homometallic warwickite V 2 OBO 3

    Publikacja

    - JOURNAL OF SOLID STATE CHEMISTRY - Rok 2018

    The synthesis, structure and elementary magnetic characterization of the homometallic warwickite V2OBO3 are reported. The material adopts the orthorhombic warwickite structure type at room temperature, space group Pnma (No. 62) with lattice parameters a = 9.2317(1) Å, b = 3.1172(1) Å, and c = 9.5313(1) Å. Temperature-dependent magnetic susceptibility, electrical resistivity, and specific heat measurements show anomalies near 35 K,...

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  • Synthesis, thermal, structural and electrical properties of vanadium-doped lithium-manganese-borate glass and nanocomposites

    Publikacja
    • A. Jarocka
    • P. Michalski
    • J. Ryl
    • M. Wasiucionek
    • J. Garbarczyk
    • T. Pietrzak

    - IONICS - Rok 2020

    A glassy sample with a nominal formula LiMn1−3x/2VxBO3 (where x = 0.05) was synthesised using the melt-quenching method. Material was characterised by differential thermal analysis (DTA), X-ray diffactometry (XRD) at room temperature and as a function of temperature (HT-XRD), X-ray photoelectron spectroscopy (XPS), impedance spectroscopy (IS) and scanning electron microscopy (SEM). Dependences of glass transition and crystallisation...

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  • Electronic and ionic relaxations in strontium-borate glass and glass-ceramics containing bismuth and vanadium oxides

    Publikacja

    - SOLID STATE IONICS - Rok 2015

    The topography, microstructure and electrical properties of strontium-borate glass and SBO glass containing bismuth and vanadium oxides, were studied. The structure was measured using X-ray diffraction (XRD), Energy Dispersive X-ray Spectrometer (EDS) and Scanning electron microscope (SEM) methods. The A.C. complex conductivity was investigated as a function of temperature and frequency. The influence of the quantity of bismuth...

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  • Distortion in the group of circle homeomorphisms

    Publikacja

    - ERGODIC THEORY AND DYNAMICAL SYSTEMS - Rok 2023

    Let G be the group PAff+(R/Z) of piecewise affine circle homeomorphisms or the group Diff∞(R/Z) of smooth circle diffeomorphisms. A constructive proof that all irrational rotations are distorted in G is given.

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  • Ultimate distortion of circular saw

    Publikacja

    - Annals of WULS, Forestry and Wood Technology - Rok 2010

    W artykule przedstawiono przyczyny i efekty poprzecznego odkształcenia piły tarczowe. Przedstawiono również zależność, na podstawie której wyznaczyć można graniczną wartość odkształcenia piły tarczowej.

  • PHONEME DISTORTION IN PUBLIC ADDRESS SYSTEMS

    Publikacja

    - Rok 2015

    The quality of voice messages in speech reinforcement and public address systems is often poor. The sound engineering projects of such systems take care of sound intensity and possible reverberation phenomena in public space without, however, considering the influence of acoustic interference related to the number and distribution of loudspeakers. This paper presents the results of measurements and numerical simulations of the...

  • Molybdenum-uranium-vanadium geochemistry in the lower Paleozoic Alum Shale of Scandinavia: Implications for vanadium exploration

    Publikacja
    • L. Bian
    • N. H. Schovsbo
    • A. Chappaz
    • X. Zheng
    • A. T. Nielsen
    • T. Ulrich
    • X. Wang
    • S. Dai
    • J. M. Galloway
    • A. Małachowska... i 2 innych

    - INTERNATIONAL JOURNAL OF COAL GEOLOGY - Rok 2021

    This paper investigates the hyper-enrichments of molybdenum (Mo), uranium (U), and vanadium (V) in the lower Paleozoic, Alum Shale of Denmark, Sweden, Norway, and Estonia. Molybdenum and U are mainly associated with organic matter and the highest contents are found in the Furongian part of the Alum Shale. This Furongian hyper-enrichment of Mo and U commenced with the Steptoean Positive Carbon Isotope Excursion (SPICE) event. The...

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  • Multipulse inverter structures with low voltage distortion

    Publikacja

    - Rok 2016

    A novel approach to the voltage source inverters (VSI) construction is presented in the paper. The invented inverter structures allow to operate several DC/AC converters in parallel resulting in lower voltage distortions at extremely low switching frequency. The research presented in the paper describes such a parallel operation of the VSI’s which is possible thanks to the use of coupled inductors. The eighteen-pulse three-level...

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  • MTS pilot tone tracking for "wow" distortion determination

    Publikacja

    - Archives of Acoustics - Rok 2008

    Artykuł przedstawia nowy algorytm do wyznaczania charakterystyki kołysania dźwięku na podstawie śledzenia zmian tonu pilota MTS. Śledzenie zmian częstotliwości nośnej tonu MTS pozwala określić zmienną w czasie głębokość pasożytniczych modulacji częstotliwości będących konsekwencją kołysania. Na tej podstawie tworzona jest charakterystyka zniekształcenia. Proponowany algorytm bazuje na zaproponowanej wcześniej metodzie śledzenie...

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  • Comprehensive distortion compensation of grid-connected inverter currents

    Publikacja

    - Rok 2014

    The paper presents a comprehensive approach to the compensation of phase current distortion of grid-connected power inverters. Four different sources of current distortion are addressed: imperfect grid synchronization caused by the distortion in the grid voltages, voltage fluctuations in the dc link, time delays in the estimation of grid voltages, and the distortion of inverter output voltages due to dead-time effects and related...