Search results for: HIGH FREQUENCY DYNAMICS - Bridge of Knowledge

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Search results for: HIGH FREQUENCY DYNAMICS

Search results for: HIGH FREQUENCY DYNAMICS

  • WRF-METEOPG: numerical weather forecast data for Poland - Days 183-189, Year 2021

    WRF-METEOPG is a numerical weather forecast system developed at the Faculty of Civil and Environmental Engineering, Gdansk University of Technology, Poland. The system was built on the basis of the Weather Research and Forecast model version 4.2 and implemented at Centre of Informatics Tricity Academic Supercomputer & Network. Physics parametrization...

  • WRF-METEOPG: numerical weather forecast data for Poland - Days 176-182, Year 2021

    WRF-METEOPG is a numerical weather forecast system developed at the Faculty of Civil and Environmental Engineering, Gdansk University of Technology, Poland. The system was built on the basis of the Weather Research and Forecast model version 4.2 and implemented at Centre of Informatics Tricity Academic Supercomputer & Network. Physics parametrization...

  • Problems with microprocessor voltage-to-frequency and frequency-to-voltage converters implementation

    The article presents the problems of digital voltage-to-frequency and frequency-to-voltage processing. Transducer systems implemented in microprocessor technology are presented, the timing of signals and functioning algorithms are discussed. An analysis of processing errors has been performed and the results of experimental studies of realized systems are presented.

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  • The share of employment in individual cities in total employment in the BPO/SSC sector in Poland

    Open Research Data
    open access

    Employment in the sector in 2019 was almost three times higher than in 2013. Throughout the analyzed period, employment grew year on year. The dynamics of changes ranged from 10% in 2019 to nearly 43% in 2016, when the highest increase in employment in the sector in nominal terms was at the level of 64,000.BPO, SSC / GBS, IT, R&D centers generated...

  • Comparison of the number of foreigners registered for retirement and disability pension insurance - at the end of the year

    Open Research Data
    open access

    The increase in the number of foreigners registered for retirement and disability insurance was characterized by the highest dynamics in the case of non-EU migrants, in particular Ukrainian citizens (26-time increase in the period 2008-2018; impressive nominal growth from 16.2 to 420.7 thousand economic migrants) and Georgia (a 37-time increase). Also...

  • The influence of frequency separation on imaging properties in DFEIT

    Publication

    - Year 2010

    W artykule przedstawiono wpływ wyboru składowych częstotliwościowych dla różnicowej tomografii impedancyjnej na wynik i własności obrazowania w dwuczęstotliwościowej różnicowej tomografii impedancyjnej.A Dual Frequency EIT is an extension of a traditional EIT that uses two sinusoidal signals for imaging. Appropriate selection of signals' frequency allows to achieve reasonable contrast of imaged structure. It has already been shown...

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  • Metody usuwania zakłóceń podczas pomiarów polowych widm Ramana

    Publication

    W pracy zostały scharakteryzowane źródła zakłóceń występujące podczas pomiarów widm Ramana w warunkach polowych. Zaprezentowano wpływ czasu integracji na jakość rejestrowanych widm w przypadkach, gdy szumy własne spektrometru mają składową typu 1/f, dominującą w zakresie małych częstotliwości. Przedstawiono także wyniki uzyskane podczas pomiarów z detekcją synchroniczną, stosowaną w przenośnych spektrometrach Ramana, w pomiarach...

  • Jednofazowy falownik napięcia z aktywnym obwodem odsprzęgającym

    Znanym zagadnieniem w jednofazowych falownikach napięcia jest pobieranie ze źródła napięcia stałego składowej przemiennej o częstotliwości dwukrotnie większej od częstotliwości generowanej przez falownik. Jednym z rozwiązań problemu jest stosowanie dużej baterii kondensatorów elektrolitycznych, lecz lepszym sposobem z punktu widzenia niezawodności i gęstości mocy przekształtnika jest stosowanie aktywnych układów odsprzęgania mocy....

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  • Frequency Diagnostics of Transformer Insulating Parameters

    Publication

    - Year 2020

    In the article is presented experimental analysis and diagnostics of insulating system oil-paper for power transformers, mainly by progressive frequency method – dielectric spectroscopy. In the 1-st part of the article is described base theory about measurement and diagnostics insulating part (oil and paper) of power transformers. In the 2-nd part of article is described measuring method of insulating frequency diagnostics - frequency...

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  • Dynamics of quantum entanglement

    Publication

    - PHYSICAL REVIEW A - Year 2002

    A model of discrete dynamics of entanglement of a bipartite quantum state is considered. It involves a global unitary dynamics of the system and periodic actions of local bistochastic or decaying channel. For initially pure states the decay of entanglement is accompanied by an increase of von Neumann entropy of the system. We observe and discuss revivals of entanglement due to unitary interaction of subsystems. For some mixed states...

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  • The OpenMolcas Web: A Community-Driven Approach to Advancing Computational Chemistry

    Open Research Data
    open access
    • M. Krośnicki

    The developments of the open-source OpenMolcas chemistry software environment since spring 2020 are described, with a focus on novel functionalities accessible in the stable branch of the package or via interfaces with other packages. These developments span a wide range of topics in computational chemistry and are presented in thematic sections: electronic...

  • Directed pulse dynamics

    Publication

    Introducing a projection method into a one-dimensional model of a pulse propagation in isotropic media, we derive and investigate a system of equation describing dynamics ultrashort pulses of opposite directions ofpropagation and ones with interaction of directed pulses with different polarization.

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  • Spin-Orbit Coupling Matrix Elements in the KRb Molecule

    Open Research Data
    open access

    The allowed 190 spin-orbit coupling (SOC) matrix elements have been calculated for the singlet (s) and triplet (t) Sigma+ (S+), Pi (P), and Delta (D) electronic states of the KRb molecule. These SOCs are needed for investigations of areas connected with classical spectroscopy, deperturbation analysis of the observed spectra, atom-molecule and molecule-molecule...

  • Stability & Dynamics of Ship and Offshore Structures II W2021/22

    e-Learning Courses
    • P. Dymarski

    Lecture and Lab classes - Stability & Dynamics of Ship and Offshore Structures II W2021/22

  • Towards detecting programmers’ stress on the basis of keystroke dynamics

    The article describes the idea of detecting stress among programmers on the basis of keystroke dynamics. An experiment with a group of students of artificial intelligence classes was performed. Two samples of keystroke data were recorded for each case, the first while programming without stress, the second under time pressure. A number of timing and frequency parameters were calculated for each sample. Then statistical analysis...

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  • Fast bubble dynamics and sizing

    Publication

    - JOURNAL OF SOUND AND VIBRATION - Year 2015

    Single bubble sizing is usually performed by measuring the resonant bubble response using the Dual Frequency Ultrasound Method. However, in practice, the use of millisecond-duration chirp-like waves yields nonlinear distortions of the bubble oscillations. In comparison with the resonant curve obtained under harmonic excitation, it was observed that the bubble dynamic response shifted by up to 20 percent of the resonant frequency...

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  • HIGH TEMPERATURES-HIGH PRESSURES

    Journals

    ISSN: 0018-1544 , eISSN: 1472-3441

  • Implementation of an Adaptive Method for Changing the Frequency Division of the Counter Clock Signal in a Frequency-to-Code Converter

    Publication

    - ENERGIES - Year 2023

    Processing physical quantities into an indirect signal is a standard method of transferring information about the measured quantity to the master system, which analyzes the data obtained from the acquisition system. The intermediate signal is very often the voltage, but another transmission medium can be the frequency of the output signal of the “physical quantity-to-frequency” converter. The article presents the implementation...

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  • Synteza układu sterowania statkiem morskim dynamicznie pozycjonowanym w warunkach niepewności

    Publication

    - Year 2019

    Niniejsza monografia obejmuje zagadnienia związane z syntezą układu dynamicznego pozycjonowania statku w środowisku morskim z zastosowaniem wybranych nieliniowych metod sterowania. W ramach pracy autorka rozważała struktury sterowania z zastosowaniem wektorowej adaptacyjnej metody backstep oraz metod jej pokrewnych, takich jak regulatory MSS (ang. multiple surface sliding), DSC (ang. dynamic surface control), NB (ang. neural backstepping)....

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  • Dissecting gamma frequency activities during human memory processing

    Publication
    • M. T. Kucewicz
    • B. M. Berry
    • V. Kremen
    • B. H. Brinkmann
    • M. R. Sperling
    • B. C. Jobst
    • R. E. Gross
    • B. Lega
    • S. A. Sheth
    • J. M. Stein... and 6 others

    - Brain: A Journal of Neurology - Year 2017

    Gamma frequency activity (30-150 Hz) is induced in cognitive tasks and is thought to reflect underlying neural processes. Gamma frequency activity can be recorded directly from the human brain using intracranial electrodes implanted in patients undergoing treatment for drug-resistant epilepsy. Previous studies have independently explored narrowband oscillations in the local field potential and broadband power increases. It is not...

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  • Structural Dynamics - 2022/2023

    e-Learning Courses
    • B. Meronk
    • T. Ferenc

    przedmiot na II semestrze studiów drugiego stopnia kierunku Civil Engineering

  • Structural Dynamics 2023/2024

    e-Learning Courses
    • B. Meronk
    • T. Ferenc

    przedmiot na II semestrze studiów drugiego stopnia kierunku Civil Engineering

  • Structural Dynamics 2024/2025

    e-Learning Courses
    • B. Meronk
    • T. Ferenc

    przedmiot na II semestrze studiów drugiego stopnia kierunku Civil Engineering

  • Przegląd systemów ładowania elektrycznych osobowych pojazdów i koncepcja dwukierunkowej ładowarki pokładowej

    Aktualnie trwa intensywny rozwój pojazdów elektrycznych (EV) i hybrydowych typu plug-in (PHEV) z pokładowymi bateriami akumulatorów. Badania w tej dziedzinie skupiają się na maksymalizowaniu sprawności oraz minimalizowaniu masy i objętości systemów ładowania baterii. W artykule przedstawiono podział systemów ładowania osobowych pojazdów typu EV/PHEV. Opisano systemy ładowania przewodowego z podziałem na ładowarki pokładowe i zewnętrzne, systemy...

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  • Measurement of the temperature change of PVCP tissue phantom illuminated by dermatological laser 1.series

    Open Research Data

    Application of laboratory set-up for characterization of thermal properties of optical tissue phantoms during laser irradiation is presented. The produced system utilizes a thermographic camera VIGOcam v50 and a dermatological laser system with a 975 nm diode laser module. The set-up was used to perform measurements of the temporal and spatial temperature...

  • The instantaneous frequency rate spectogram

    An accelerogram of the instantaneous phase of signal components referred to as an instantaneous frequency rate spectrogram (IFRS) is presented as a joint time-frequency distribution. The distribution is directly obtained by processing the short-time Fourier transform (STFT) locally. A novel approach to amplitude demodulation based upon the reassignment method is introduced as a useful by-product. Additionally, an estimator of energy...

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  • Multiple-channel frequency-adaptive active vibration control using SONIC

    Publication

    SONIC (self-optimizing narrowband interference canceller) is an acronym of a new approach to rejection of sinusoidal disturbances acting at the output of a discretetime stable linear plant with unknown and possibly timevarying dynamics. The paper presents two frequency-adaptive extensions of the multivariate SONIC algorithm. The efficacy of the proposed solutions is tested using our laboratory-scale active vibration control plant.

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  • Dissociative ionization dynamics of dielectric gas C3F7CN

    Publication
    • M. Ranković
    • J. Chalabala
    • M. Zawadzki
    • J. Kočišek
    • P. Slavíček
    • J. Fedor

    - PHYSICAL CHEMISTRY CHEMICAL PHYSICS - Year 2019

    Fluoronitrile C3F7CN is a promising candidate for the replacement of SF6 dielectric gas in high-voltage insulation. We present a combined experimental and theoretical study on its ionization dynamics probed in the 0-100 eV energy range. We exploited the total ion collection technique to determine the absolute ionization cross section, mass spectrometry to determine the fragment branching ratios and ab initio nonadiabatic molecular...

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  • Technological capability dynamics through cluster organizations

    Publication

    - Baltic Journal of Management - Year 2020

    Purpose – The purpose of the paper is to portrait how members of cluster organizations (COs) perceive the role of COs in enabling them to accumulate technological capability (TC) significant for their innovation. Design/methodology/approach – The authors report the findings from their qualitative study based on an analysis of four COs. The organizational inertia and absorptive capacity (AC) theories are the theoretical underpinning...

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  • Hysteresis modelling of a medium frequency single-phase transformer

    Publication

    - Year 2017

    The article describes a feedback Preisach hysteresis model equivalent circuit implementation of a medium frequency single-phase transformer being a part of a high power and high efficiency DC-DC converter. The macroscopic models of magnetic hysteresis are introduced and the feedback Preisach model is selected for further analysis. The hysteresis model is developed for a prototype transformer and the hysteresis loops are compared...

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  • Stability & Dynamics of Ship and Offshore Structures I S2020/21

    e-Learning Courses
    • P. Dymarski

    Lectures and exercises from the course "Stability & Dynamics of Ship and Offshore Structures I"

  • Modelling of planar movement dynamics of upper limb

    Publication

    - Year 2013

    The original model describing planar movement dynamics of upper limb is presented. The upper limb is modelled as two-joints system loaded by external forces and internal forces of striated skeletal muscles. A behaviour of each muscle is modelled as a system composed of serially linked rheologic fragments that have different mechanical properties. These muscle models allow us to simulate a behaviour of short fusiform muscle (3DOF...

  • Metody usuwania zakłóceń podczas pomiarów polowych widm Ramana

    W pracy zostały scharakteryzowane źródła zakłóceń występujące podczas pomiarów widm Ramana w warunkach polowych oraz sposoby redukcji ich wpływu na jakość rejestrowanych widm. Zaprezentowano wpływ czasu integracji na jakość rejestrowanych widm w przypadkach, gdy szumy własne spektrometru mają składową typu 1/f, dominującą w zakresie małych częstotliwości. Przedstawiono także wyniki uzyskane podczas pomiarów z detekcją synchroniczną,...

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  • Analysis of inductive power transfer systems for variable air gap and voltage supply frequency

    Publication

    - Year 2011

    The paper describes an IPT system, by which electrical energy may be transmitted through a large air gap between coils without electrical connection. It presents theoretical and simulation analysis of IPT, which allows for supplying a receiver in the conditions of slow, in relation to the dynamics of power supply, changes in dimension of the air gap. The influence of frequency characteristics of the system on the possible selection...

  • Investigation of the laser generated ablation plasma plume dynamics and plasma plume sound wave dynamics

    Publication
    • M. Tański
    • R. Barbucha
    • M. Kocik
    • K. Garasz
    • J. Mizeraczyk

    - Year 2012

    We investigated the dynamics of laser generated ablation plasma plume expanding in ambient air and dynamics of the sound wave generated by the expanding plasma. The ablation plasma plume was generated during nanosecond laser micromachining of the thin metal foil. The time-resolved images of the expanding plasma plume and sound wave were captured at several nanosecond intervals. Using captured images the expansion rate of the plasma...

  • On dynamics of origami-inspired rod

    Publication

    We discuss the dynamics of a relatively simple origami-inspired structure considering discrete and continuum models. The latter was derived as a certain limit of the discrete model. Here we analyze small in-plane deformations and related equations of infinitesimal motions. For both models, dispersion relations were derived and compared. The comparison of the dispersion relations showed that the continuum model can capture the behavior...

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  • A new approach to active noise and vibration control - [Part II: unknown frequency case]

    Publication

    This paper presents a new approach to rejection of complex-valued sinusoidal disturbances acting at the output of a discrete-time stable linear plant with unknown and possibly timevarying dynamics. It is assumed that both the instantaneous frequency of the sinusoidal disturbance and its amplitude may be slowly varying with time and that the output signal is contaminated with wideband measurement noise. It is not assumed that a...

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  • Measurements of relative frequency instability

    Frequency constancy can be determined by the change in time for the subsequent periods. The article shows that classical the method of digital period measurement is not suitable for the measurement process. Therefore, a method using an integrating circuit is being proposed. Errors in the measurement of the given method have been analyzed.

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  • Automatic Optimization Of Adaptive Notch Filter’s Frequency Tracking

    Publication

    - Year 2014

    Estimation of instantaneous frequency of narrowband com- plex sinusoids is often performed using lightweight algo- rithms called adaptive notch filters. However, to reach high performance, these algorithms require careful tuning. The paper proposes a novel self-tuning layer for a recently intr o- ducedadaptive notch filtering algorithm. Analysis shows th at, under Gaussian random-walk type assumptions, the resultin g solution converges...

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  • Self-tuning adaptive frequency tracker

    Publication

    An automatic gain tuning algorithm is proposed for a recently introduced adaptive notch filter. Theoretical analysis and simulations show that, under Gaussian random-walk type assumptions, the proposed extension is capable of adjusting adaptation gains of the filter so as to minimize the mean-squared frequency tracking error without prior knowledge of the true frequency trajectory. A simplified one degree of freedom version of...

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  • Dynamics of algae growth and nutrients in experimental enclosures culturing bighead carp and common carp: Phosphorus dynamics

    Publication
    • S. Huang
    • M. Wu
    • C. Zang
    • S. Du
    • J. Domagalski
    • M. Gajewska
    • F. Gao
    • C. Lin
    • Y. Guo
    • B. Liu... and 4 others

    - International Journal of Sediment Research - Year 2016

    This is the third paper of the series about “Dynamics of algae growth and nutrients in experimental enclosures culturing bighead carp and common carp”. In this paper, phosphorus dynamics were investigated under the condition of culturing bighead carp and common carp with added fish food (nitrogen dynamics is discussed in the second paper because their behaviors are so different from each other). Nearly fifty days’ observation results...

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  • A Compact Basis for Reliable Fast Frequency Sweep via the Reduced-Basis Method

    Publication

    A reliable reduced-order model (ROM) for fast frequency sweep in time-harmonic Maxwell’s equations by means of the reduced-basis method is detailed. Taking frequency as a parameter, the electromagnetic field in microwave circuits does not arbitrarily vary as frequency changes, but evolves on a very low-dimensional manifold. Approximating this low-dimensional manifold by a low dimension subspace, namely, reduced-basis space, gives...

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  • Robert Bogdanowicz prof. dr hab. inż.

    Robert Bogdanowicz received his Ph.D. degree with honours in Electronics from the Gdansk University of Technology. He worked as a post-doc researcher in Ernst-Moritz-Arndt-Universität Greifswald Institut für Physik. He has initiated optical emission imaging of muti-magnetron pulsed plasma and contributed to the development of antibacterial implant coatings deposited by high-power impulse magnetron sputtering. He moved back to...

  • Extending the Frequency Limit of Microstrip-Coupled CSRR Using Asymmetry

    Publication

    - IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES - Year 2021

    Abstract— This article explains the frequency limitation in designing microstrip circuits based on a complementary split-ring resonator (CSRR) and reports a novel technique for increasing its operating frequency, which makes the CSRR suitable for high-frequency applications. This study helps in synthesizing the dimensions of symmetric CSRR (SCSRR) and asymmetric CSRR (ACSRR) circuits, which shows the applicability of the proposed...

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  • Soft – Partial Frequency Reuse Method for LTE-A

    Publication

    In the paper a novel SPFR frequency reuse method is proposed which can be used for improvement of physical resources utilization efficiency in LTE-A. The proposed method combines both SFR and PFR giving the possibility of more flexible use of frequency band in different regions of a cell. First, a short study on the problem of frequency reuse in cells is discussed including bibliography overview....

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  • A fast time-frequency multi-window analysis using a tuning directional kernel

    Publication

    - SIGNAL PROCESSING - Year 2018

    In this paper, a novel approach for time-frequency analysis and detection, based on the chirplet transform and dedicated to non-stationary as well as multi-component signals, is presented. Its main purpose is the estimation of spectral energy, instantaneous frequency (IF), spectral delay (SD), and chirp rate (CR) with a high time-frequency resolution (separation ability) achieved by adaptive fitting of the transform kernel. We...

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  • Roadmap on dynamics of molecules and clusters in the gas phase

    Publication
    • H. Zettergren
    • A. Domaracka
    • T. Schlathölter
    • P. Bolognesi
    • S. Díaz-Tendero
    • M. Łabuda
    • S. Tosic
    • S. Maclot
    • P. Johnsson
    • A. Steber... and 34 others

    - EUROPEAN PHYSICAL JOURNAL D - Year 2021

    This roadmap article highlights recent advances, challenges and future prospects in studies of the dynamics of molecules and clusters in the gas phase. It comprises nineteen contributions by scientists with leading expertise in complementary experimental and theoretical techniques to probe the dynamics on timescales spanning twenty orders of magnitudes, from attoseconds to minutes and beyond, and for systems ranging in complexity...

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  • HIGH TEMPERATURE

    Journals

    ISSN: 0018-151X , eISSN: 1608-3156

  • High-Throughput

    Journals

    ISSN: 2571-5135

  • Periodic and chaotic dynamics in a map‐based neuron model

    Map-based neuron models are an important tool in modeling neural dynamics and sometimes can be considered as an alternative to usually computationally costlier models based on continuous or hybrid dynamical systems. However, due to their discrete nature, rigorous mathematical analysis might be challenging. We study a discrete model of neuronal dynamics introduced by Chialvo in 1995. In particular, we show that its reduced one-dimensional...

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