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Search results for: miniaturized passive components

Search results for: miniaturized passive components

  • Prediction of ringing frequencies in DC-DC boost converter

    Publication

    - Year 2016

    In the paper ringing phenomena in a DC-DC boost converter is presented. The ringing frequency is calculated using an analytical formula. The necessary wide band models of MOSFET transistor, passive and parasitics are described. The calculation results are verified in simulation and laboratory tests.

  • Hydrogen effects in duplex stainless steel welded joints - electrochemical studies

    Publication

    In this work results on the influence of hydrogen on passivity and corrosion resistance of 2205 duplex stainless steel (DSS) welded joints are described. The results were discussed by taking into account three different areas on the welded joint: weld metal (WM), heat-affected zone (HAZ) and parent metal. The corrosion resistance was qualified with the polarization curves registered in a synthetic sea water. The conclusion is that,...

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  • Plate heat exchanger with porous structure for potential use in ORC system

    Publication

    - Year 2014

    The experimental analysis of passive heat transfer intensification in the case of plate heat exchanger has been carried out. The passive intensification was obtained by a modification of the heat transfer surface, which was covered by a metallic porous microlayer. The experiment was accomplished in two stages. In the first stage the commercial stainless steel gasketed plate heat exchanger was investigated, while in the second one...

  • Plate heat exchanger with porous structure for potential use in ORC system

    Publication

    - Mechines Technologies Materials - Year 2014

    The experimental analysis of passive heat transfer intensification in the case of plate heat exchanger has been carried out. The passive intensification was obtained by a modification of the heat transfer surface, which was covered by a metallic porous microlayer. The experiment was accomplished in two stages. In the first stage the commercial stainless steel gasketed plate heat exchanger was investigated, while in the second one...

  • Unconventional and user-friendly sampling techniques of semi-volatile organic compounds present in an indoor environment: An approach to human exposure assessment

    The commonly applied solutions used to assess the potential risk of human exposure to semi-volatile organic compounds (SVOCs) are based on the investigation of biological samples collected in an invasive or non-invasive manner. For SVOCs, which are typically introduced to humans through the respiratory system, dermal adsorption, or digestive system, sampling solutions generally used in the indoor environments are classified as...

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  • Sławomir Milewski prof. dr hab. inż.

    Sławomir Milewski, born in 1955 in Puck, Poland, graduated in 1979 in Chemistry from the Faculty of Chemistry, Gdańsk University of Technology (GUT). In 1984 was employed at the Department of Pharmaceutical Technology and Biochemistry. In 1985 he got his PhD, in 1994 became a DSc (habilitation) and in 2002 got the professorship in chemical sciences. Currently he is a full professor and Head of the Department of Pharmaceutical Technology...

  • Remote Monitoring System for Impedance Spectroscopy using Wireless Sensor Network

    Publication

    - Year 2012

    The architecture of a miniaturized impedanceanalyser with wireless communication module for remoteImpedance Spectroscopy (IS) of anticorrosion coatings ondifficult-to-reach objects (e.g. on the steel construction ofthe bridge) is described in this paper. Some practical aspectsof implementation of a Wireless Sensor Network (WSN) arealso discussed. A low scale, middle range, WSN networkcomposed of a Base Station (BS) with a Personal...

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  • Urban Prototyping in CAVE Cooperation Between the Academy of Fine Arts in Gdansk and the Gdansk University of Technology

    Publication

    - Year 2018

    The paper describes results of cooperation between the Passive Architecture Laboratory at the Academy of Fine Arts in Gdańsk and the Immersive 3D Visualization Lab at the Gdańsk University of Technology. The authors as the design supervisors (respectively for a team of architects and a team of IT specialists) present advantages and disadvantages of urban design with use of virtual reality.

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  • Control strategy for the multilevel cascaded H-bridge converter

    Publication

    - Year 2013

    The paper presents the control strategy for Cascaded H-bridge (CHB) converter . The converter output voltage using Space-Vector Pulse Width Modulation (SV-PWM) strategy is controlled. The DC-link voltages are controlled by appropriate choice of H-Bridges and appropriate choice of active and passive vectors.

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  • Neurochemical changes underlying cognitive impairment in olfactory bulbectomized rats and the impact of the mGlu5-positive allosteric modulator CDPPB

    Publication
    • A. Płoska
    • P. Cieślik
    • A. Siekierzycka
    • L. Kalinowski
    • J. M. Wierońska

    - BRAIN RESEARCH - Year 2021

    The olfactory bulbectomized (OBX) rat model is a well-established model of depression in which antidepressant drugs reverse deficits in the passive avoidance test 14 days after administration. Recently, the olfactory bulbectomized rat model has been proposed to be a model of Alzheimer’s disease (AD), and the available data indicate similarities between the changes that typically occur in AD and those observed in OBX animals. In...

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  • Recent Advances in Loop Heat Pipes with Flat Evaporator

    Publication

    - ENTROPY - Year 2021

    The focus of this review is to present the current advances in Loop Heat Pipes (LHP) with flat evaporators, which address the current challenges to the wide implementation of the technology. A recent advance in LHP is the design of flat-shaped evaporators, which is better suited to the geometry of discretely mounted electronics components (microprocessors) and therefore negate the need for an additional transfer surface (saddle)...

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  • Quality measure of VoIP services in carrier grade systems

    This paper describes passive measurement method of VoIP services quality in carrier grade systems, engaging slight system resources. Measurement is based on analyzing quality information in sender and receiver reports in RTCP packets sent by the end points of RTP session. Data is analyzed and stored by Session Boarder Controllers SBC. Objective evaluation of VoIP calls is based on quality information of IP connection and voice...

  • Atomistic Surrogate-Based Optimization for Simulation-Driven Design of Computationally Expensive Microwave Circuits with Compact Footprints

    Publication

    A robust simulation-driven design methodology for computationally expensive microwave circuits with compact footprints has been presented. The general method introduced in this chapter is suitable for a wide class of N-port un-conventional microwave circuits constructed as a deviation from classic design solutions. Conventional electromagnetic (EM) simulation-driven design routines are generally prohibitive when applied to numerically...

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  • Comparison of Impedance-Source Networks for Two and Multilevel Buck–Boost Inverter Applications

    Publication
    • O. Husev
    • F. Blaabjerg
    • C. Roncero-Clemente
    • E. Romero-Cadaval
    • D. Vinnikov
    • Y. Siwakoti
    • R. Strzelecki

    - IEEE TRANSACTIONS ON POWER ELECTRONICS - Year 2016

    mpedance-source networks are an increasingly popular solution in power converter applications, especially in single-stage buck-boost power conversion to avoid additional front-end dc-dc power converters. In the survey papers published, no analytical comparisons of different topologies have been described, which makes it difficult to choose the best option. Thus, the aim of this paper is to present a comprehensive analytical comparison...

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  • Effect of cobalt addition on the corrosion behaviorof near equiatomic NiTi shape memory alloy in normal saline solution: electrochemical and XPS studies

    Publication

    - RSC Advances - Year 2018

    The electrochemical and corrosion (uniform and localized) behavior of a binary Ni52Ti48 shape memory alloy (SMA) and two ternary Ni52Ti48-xCox (x = 1.5 and 4.0 wt.%) SMAs were studied. Measurements were conducted in 0.9% NaCl solution at 37 oC employing various electrochemical methods. These include: linear polarization resistance (LPR), linear sweep voltammetry (LSV), chronoamperometry and dynamic electrochemical impedance spectroscopy...

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  • Discrete Modelling of Micro-structural Phenomena in Granular Shear Zones

    Publication

    The micro-structure evolution in shear zones in cohesionless sand for quasi-static problems was analyzed with a discrete element method (DEM). The passive sand failure for a very rought retaining wall undergoing horizontal translation towards the sand backfill was discussed. To simulate the behaviour of sand, the spherical discrete element model was used with elements in the form of rigid spheres with contacts moments.

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  • TRANSFER OF ELECTRIC ENERGY [2023/24]

    e-Learning Courses
    • J. Klucznik

    Course content: Basic information on the structure of the power system, the major devices (components) for generation, transmission and distribution of electricity. Active and reactive power generation and their sources. Power supply networks. Tasks, structure, parameters. AC and DC transmission of electricity. Equivalent diagrams of the components of the power system. Steady state load flow calculation: currents, voltage,...

  • TRANSFER OF ELECTRIC ENERGY [2022/23]

    e-Learning Courses
    • J. Klucznik

    Course content: Basic information on the structure of the power system, the major devices (components) for generation, transmission and distribution of electricity. Active and reactive power generation and their sources. Power supply networks. Tasks, structure, parameters. AC and DC transmission of electricity. Equivalent diagrams of the components of the power system. Steady state load flow calculation: currents, voltage,...

  • TRANSFER OF ELECTRIC ENERGY [2024/25]

    e-Learning Courses

    Course content: Basic information on the structure of the power system, the major devices (components) for generation, transmission and distribution of electricity. Active and reactive power generation and their sources. Power supply networks. Tasks, structure, parameters. AC and DC transmission of electricity. Equivalent diagrams of the components of the power system. Steady state load flow calculation: currents, voltage, power,...

  • Determination of Earth Pressure and Displacement of the Retaining Structure According to the Eurocode 7-1

    Publication

    - Year 2016

    Comparative analysis of standard guidelines and findings given in EC7-1 and in Polish Standard PN-83/B-03010. Discussed guidelines concerning active and passive earth pressure as well as at rest pressure state. Wall displacement causing limit states of earth pressure and resistance. Interactive assumptions concerning intermediate earth pressure and resistance values. Conclusions and final remarks.

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  • Current trends in the field of steganalysis and guidelines for constructions of new steganalysis schemes

    The paper concerns blind steganalysis techniques in the passive steganalysis scenario designed to detect the steganographic cover modification schemes. The goal is to investigate the state-of-art in the field of steganalysis, and, above all, to recognize current trends existing in this field and determine guidelines for constructions of new steganalysis schemes. The intended effects are to examine the possibilities for the development...

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  • Design optimization of novel compact circular polarization antenna

    Publication

    The paper describes a structure and a design optimization procedure of a miniaturized circular polarization antenna with elliptical ground plane slots and feed line with stepped-impedance stubs. Constrained optimization of all antenna parameters is executed in order to explicitly reduce the antenna size while maintaining required impedance axial ratio bandwidth of 5 GHz to 7 GHz at the same time. The size of the optimized antenna...

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  • A compact seven-section rat-race hybrid coupler incorporating pbg cells

    A conventional rat-race coupler has been doubly miniaturized: (i) characteristic impedances and electrical lengths of microstrip sections have been adequately modified as the first step of size reduction and (ii) T-shaped PBG cells have been implemented to diminish strip section length as the second step of circuit rat-race couplerminiaturization. The experimental results show good agreement with theoretical characteristics. Furthermore,...

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  • Badania eksperymentalne strefy przypodporowej żelbetowych belek częściowo sprężonych

    Publication

    - Year 2010

    This project refers to the study the shear zone, under full and partial prestressing in comparison to beams with passive reinforcement.For comparison, variable parameters have been determined:- a/d (from 1,5 to 3,5) - it's shear span to effective depth of the beam . Assuming constant geometrical quantities, "a" is variable.- 26 beams had no vertical shear reinforcement, and the other 26 had closed stirrups.- prestressing intensity...

  • Nonlinear Control of a Doubly Fed Generator Supplied by a Current Source Inverter

    Publication

    Nowadays, wind turbines based on a doubly fed induction generator (DFIG) are a commonly used solution in the wind industry. The standard converter topology used in these systems is the voltage source inverter (VSI). The use of reverse-blocking insulated gate bipolar transistor (RB-IGBT) in the current source inverter topology (CSI), which is an alternative topology, opens new possibilities of control methods. This paper presents...

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  • ON ESTIMATION OF OCCUPANT SAFETY IN VEHICULAR CRASHES INTO ROADSIDE OBSTACLES USING NON-LINEAR DYNAMIC ANALYSIS

    Publication

    The article describes a comparison of two general methods of occupants safety estimation based on a numerical examples. The so-called direct method is mainly based on the Head Injury Criterion of a crash test dummy in a vehicle with passive safety system while the indirect method uses a European standards approach to estimate impact severity level. Numerical simulations in LS-DYNA have been conducted.

  • Study of the Effectiveness of Model Order Reduction Algorithms in the Finite Element Method Analysis of Multi-port Microwave Structures

    Publication

    - Year 2022

    The purpose of this paper is to investigate the effectiveness of model order reduction algorithms in finite element method analysis of multi-port microwave structures. Consideration is given to state of the art algorithms, i.e. compact reduced-basis method (CRBM), second-order Arnoldi method for passive-order reduction (SAPOR), reduced-basis methods (RBM) and subspace-splitting moment-matching MOR (SSMM-MOR)

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  • Split-Beam Echosounder Data from Puck Bay

    Publication

    - Year 2022

    The acoustic data was collected in 2018–2019 in the Bay of Puck in the seasons: autumn, winter, spring. The data was collected during the day and night using three split-beam echosounders with frequencies of 38 kHz, 120 kHz and 333 kHz at a designated study area not far from the city of Hel, while the ship was sailing. To ensure data quality, the echosounders were calibrated and passive noise was measured.

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  • Control System Design for Dynamic Positioning using Vectorial Backstepping

    The problem of synthesis a dynamic positioning system for low frequency model of surface vessel was considered in this paper. The recursive vectorial backstepping control design was used to keep a fixed position and heading in presence of wave disturbances. The passive observer was introduced to smooth the measurements and to estimate the velocities needed for the control algorithm. The computer simulation results were given to...

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  • Comparative modeling of shear localization in granular bodies with FEM and DEM

    Publication

    The intention of the paper is to compare the calculations of shear zones in granular bodies using two different approaches: a continuum and a discrete one. In the first case, the FEM based on a micro-polar hypoplastic constitutive law was used. In the second case, the DEM was taken advantage of, where contact moments were taken into account to model grain roughness. The comparative calculations were performed for a passive case...

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  • Robotic manipulators, Lab, MiBM, st. I, sem.6 (PG_00053663) 03.2022 Fri

    e-Learning Courses
    • W. Sieklicki

    The course Manipulators and Industrial Robots (laboratory) is for students of the 6th semester of a full-time bachelor's degree studies of Mechatronics. The course includes  laboratory classes in the field of industrial manipulators - their construction, features, components, control, and modular robots - their programming and models.

  • Robotic manipulators, Lab, MiBM, st. I, sem.6 (PG_00053663) 03.2023

    e-Learning Courses
    • W. Sieklicki

    The course Manipulators and Industrial Robots (laboratory) is for students of the 6th semester of a full-time bachelor's degree studies of Mechatronics. The course includes  laboratory classes in the field of industrial manipulators - their construction, features, components, control, and modular robots - their programming and models.

  • Robotic manipulators, Lab, MiBM, st. I, sem.6 (PG_00053663) 03.2024 kopia 1

    e-Learning Courses
    • W. Sieklicki

    The course Manipulators and Industrial Robots (laboratory) is for students of the 6th semester of a full-time bachelor's degree studies of Mechatronics. The course includes  laboratory classes in the field of industrial manipulators - their construction, features, components, control, and modular robots - their programming and models.

  • Robotic manipulators, Lab, MiBM, st. I, sem.6 (PG_00053663) 03.2024

    e-Learning Courses
    • W. Sieklicki

    The course Manipulators and Industrial Robots (laboratory) is for students of the 6th semester of a full-time bachelor's degree studies of Mechatronics. The course includes  laboratory classes in the field of industrial manipulators - their construction, features, components, control, and modular robots - their programming and models.

  • The Relationships Between BTEX, NOx, and O3 Concentrations in Urban Air in Gdansk and Gdynia, Poland

    Publication

    This paper presents the results of atmospheric air quality research conducted in the areas of two shipyard cities: Gdansk and Gdynia (Poland), in the period between March and December 2011. The purpose of the research was focused on determination of benzene, toluene, ethylbenzene, and xylenes (BTEX) compounds in atmospheric air. Passive sampling technique, with Radiello® diffusive passive samplers, was used for BTEX sample collection...

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  • Paulina Duch-Zebrowska MSc

    I spent 15 years of my professional life in London working my way up as an architect to become a design and construction manager. I have designed and supervised the construction of apartments in the legendary Soho, shops on Oxford Street in London and exclusive residences in Windsor. I have a great ability to establish contacts based on mutual respect, at every level of investment, including with the Investor, Designers, and Contractors....

  • Design and simulation of a new prototype of piezoelectric cantilever sensor/actuator for analysis of the soft tissues properties

    This paper is devoted to a new prototype of piezoelectric cantilever transducer dedicated for the characterization of the mechanical properties of soft tissues. General description of the actuator’s structure is presented including the basic principles of the measurement. The chosen geometry of the prototype is discussed and compared with the existing one. Constitutive equations are presented for the active and passive layer of...

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  • A new prototype of piezoelectric bending resonant transducer for analysis of soft tissues properties

    Publication

    This paper is devoted to a new piezoelectric bending resonant transducer prototype dedicated to the characterization of the mechanical properties of soft tissue. A general description of the actuator’s structure is presented including the basic principles of the measurement. The chosen geometry of the prototype is discussed and compared with the existing version. Constitutive equations are presented for the active and passive layer...

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  • Robotics, Lab, MiBM, st. II, sem.1 (PG_00057380) 03.2022 Thu

    e-Learning Courses
    • W. Sieklicki

    The course Robotics (laboratory) is for students of the 1st semester of a full-time Master degree studies of Machine Design. The course includes  laboratory classes in the field of industrial manipulators - their construction, features, components, control, and modular robots - their programming and models.

  • Roller burnishing

    Publication

    - Year 2013

    The paper shows the process of roller burnishing as a method of finishing machine components. Based on own research the author presents the effects of the roller burnishing process to increase the hardness and residual stress as well as the wear and fatigue strength of burnishing components.

  • Framework for Integration Decentralized and Untrusted Multi-vendor IoMT Environments

    Publication

    - IEEE Access - Year 2020

    Lack of standardization is highly visible while we use historical data sets or compare our model with others that use IoMT devices from different vendors. The problem also concerns the trust in highly decentralized and anonymous environments where sensitive data are transferred through the Internet and then are analyzed by third-party companies. In our research we propose a standard that has been implemented in the form of framework...

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  • Audio codec employing frequency-derived tonality measure

    Publication

    A transform codec employing efficient algorithm for detection of spectral tonal components is presented. The tonality measure used in MPEG psychoacoustic model is replaced with the method providing adequate tonality estimates even if the tonal components are deeply frequency modulated. The reliability of hearing threshold estimated using psychoacoustic model with standardized tonality measure and the proposed one is investigated...

  • An Empirical System Loss Model for Body Area Networks in a Passenger Ferry Environment

    Publication

    - Year 2018

    This paper presents a general empirical system loss model for estimating propagation loss in Body Area Networks in off-body communications at 2.45 GHz in a passenger ferry environment. The model is based on measurements, which were carried out in dynamic scenarios in the discotheque passenger ferry environment. The model consists of three components: mean system loss, attenuation resulting from the variable antenna position on...

  • An Empirical System Loss Model for Body Area Networks in a Passenger Ferry Environment

    Publication

    - Year 2018

    This paper presents a general empirical system loss model for estimating propagation loss in Body Area Networks in off-body communications at 2.45 GHz in a passenger ferry environment. The model is based on measurements, which were carried out in dynamic scenarios in the discotheque passenger ferry environment. The model consists of three components: mean system loss, attenuation resulting from the variable antenna position on...

  • Heat transfer intensification by enlarged surface roughness in the plate heat exchanger

    Publication

    - Year 2013

    In the paper an experimental analysis of passive heat transfer intensification technique employed in the case of the plate heat exchanger is presented. The passive intensification was obtained by a modification of the heat transfer surface. The roughness of surface was increased by a use of glass micro-beads. Single-phase convective heat transfer in the water-water system was studied. The experiment was accomplished in two stages....

  • Split-beam echosounder data from Gdansk Deep Summer 2019

    Open Research Data
    open access

    The acoustic data was collected in 2019, in the Gdansk Deep, in the season: Summer. Data was collected during the day and night. Three split-beam echosounders with frequencies of 38 kHz, 120 kHz and 333 kHz were used to collect the data. The data was collected while the ship was sailing. To ensure data quality, echosounders were calibrated and passive...

  • Mineral oil-based hydrostatic drives as the basic drive systems in the construction of offshore eqiupment projects

    The aim of this article is to present the components used in the production of mineral oil-based hydrostatic drives as the basic drive systems for the offshore industry. The article contains de-scriptions of the components of the said systems, with the description of their suitability for mi-neral oil operation and offshore applications.

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  • Enhanced switched parasitic antenna with switched active monopoles for indoor positioning systems

    Publication

    This paper presents the concept of enhanced reduced-size steerable antenna array with two rows of switched active and passive elements. Designed array is similar to ESPAR antenna but it has a set of switched monopoles instead of central one. It is intended for 2.4 GHz ISM applications with emphasis on indoor positioning systems (IPS). Proposed antenna provides improved radiation parameters and reduced dimensions in comparison to...

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  • Numerical Model of Surface and Quasi-Spherical Sea Noise and Its Application to Analysis of DIFAR Systems

    Various types of passive sonar systems are used to detect submarines. These activities are complex and demanding. Therefore, computer simulations are most often used at the design stage of these systems. For this reason, it is also necessary to simulate the acoustic ambient noise of the sea. The article proposes a new numerical model of surface and quasi-spherical sea noise and presents its statistical parameters. The results of...

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  • Problems of exact generation ofinverter output voltage

    Publication

    W pracy przedstawiono nową modyfikację modulatora szerokości impulsów. Rozważono problemy generacji dokładnej wartości napięcia wyjściowego falownika. Zaproponowano dwie metody generacji małej wartości napięcia.