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Application of superelements in static analysis of thin-walled structures.
PublikacjaW pracy omówiono koncepcję zastosowania superelementów MES w statycznej analizie konstrukcji cienkościennych ze szczególnym uwzględnieniem belek cienkościennych wzmocnionych stężeniami oraz węzłów ram zbudowanych z elementów cienkościennych. W zamieszczonych przykladach numerycznych rozwiazania uzyskane z pomoca superelementów porównano z wynikami otrzymanymi przy gestej dyskretyzacji MES całej konstrukcji elementami powłokowymi.
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Static puncture tests of geotextiles and geotextile - related prodcts
PublikacjaW artykule omówiono dwa rodzaje przebicia statycznego geotekstyliów i wyrobów pokrewnych: standardowe badanie CBR zgodnie z normą EN ISO 12236 i nowe metody opracowywane przez CEN TC 189 w ramach projektu normy PrEN 189066. Procedury wykonywania badań są podobne, różnią się: tłokiem obciążającym, metodą podparcia materiału, wypełnieniem cylindra oraz zastosowanym materiałem geosyntetycznym.
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Static analysis of thin-walled beams and frames with stiffeners.
PublikacjaPraca zawiera pełną treść referatu wygłoszonego na Konferencji w Wilnie.Referat przedstawia problem numerycznej analizy belek i ramstalowych zbudowanych z bi-symetrycznych profili cienkościennychze stężeniami. Wyniki analizy przeprowadzonej według koncepcji superelementu jednowymiarowego porównano z wynikami obliczeń przy zastosowaniu gęstej siatki elementów powłokowych QUAD4 programu MSC NASTRAN.
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Acta Crystallographica Section C-Structural Chemistry
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Electrical signatures of Nimbostratus and Stratus clouds in ground-level vertical atmospheric electric field and current density at mid-latitude station Swider, Poland
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Circularly Polarized Antenna Array design with the Potential of Gain-Size Trade-off and Omnidirectional Radiation for Millimeter-Wave Small Base Station Applications
PublikacjaThis paper presents the design and validation of a slot-patch-hybrid circularly polarized antenna array for 28 GHz millimeter (mm) wave (mm-wave) applications. The proposed design has a simple geometry that facilitates the fabrication process, which is otherwise a challenging task due to the sub-mm dimensions of the circuit in the mm-wave band. In the proposed structure, aperture-coupled series slot-fed array is utilized to excite...
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A Time Delay Controller Included Terminal Sliding Mode and Fuzzy Gain Tuning for Underwater Vehicle-Manipulator Systems
PublikacjaAn improved Time Delay Control (TDC) method for an Underwater Vehicle-Manipulator System (UVMS) is proposed. The proposed controller consists of three terms: a time-delay-estimation term that cancels nonlinearities of the UVMS dynamics, a Terminal Sliding Mode (TSM) term that provides a fast response and a PID term that reduces the tracking error. In addition the proposed controller uses fuzzy rules to adaptively tune the gains...
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Closed-Loop Control System Design for Wireless Charging of Low-Voltage EV Batteries with Time-Delay Constraints
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Service time distribution influence on end-to-end call setup delay calculation in networks with Session Initiation Protocol
PublikacjaThe most important GoS parameter for networks with SIP protocol is end-to-end call setup delay. So far there were no coherent models allowing calculation of these parameters for networks with SIP protocol. Few models were developed but they are insufficient. In the paper we propose model which allows end-to-end call setup delay calculation for networks with SIP protocol. The model is using chain of M/G/1/K models and is applicable...
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Closed-Loop Control System Design for Wireless Charging of Low-Voltage EV Batteries with Time-Delay Constraints
PublikacjaThis paper presents an inductive power transfer system on the basis of a double single- phase three-level T-type inverter and two split transmitting coils for constant current and constant voltage wireless charging of low-voltage light electric vehicle batteries with closed-loop control, considering time-delay communication constraints. An optimal control structure and a modified control strategy were chosen and implemented to...
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RF Multi-Functional Input-Reflectionless Dispersive-Delay Structure With Sharp-Rejection Filtering Using Channelization Techniques
PublikacjaA class of RF multi-functional input-reflectionless dispersive-delay structure (DDS) with linear-type in-band groupdelay variation and sharp-rejection bandpass-filtering capability is reported. It exploits a two-branch-channelized/balanced-type circuit with similar low-order reflective DDS units inside its channels, which are connected through input/output 3-dB quadrature wideband couplers. The adopted DDS unit is based on a coupledresonator...
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Clinical presentation of Y189C mutation of the NOTCH3 gene in the Polish family with CADASIL
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High Frequency Proximity Losses Determination for Rectangular Cross Section Conductors
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Minimization of Eddy Current Losses in a Straight Rectangular Cross Section Conductor
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High-Frequency Proximity Losses Determination for Rectangular Cross-Section Conductors
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A common nonsense mutation of the BLM gene and prostate cancer risk and survival
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Doctors’ attitudes in the situation of delivering bad news: patients’ experience and expectations
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K-ras gene mutation as an early prognostic marker of colon cancer
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Idiosyncratic risk and cross-section of stock returns in emerging European markets
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Stacking and rotation-based technique for machine learning classification with data reduction
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Idiosyncratic volatility and the cross-section of anomaly returns: is risk your Ally?
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Is tail risk priced in the cross-section of Chinese mutual fund returns?
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Salience theory and the cross-section of stock returns: International and further evidence
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The cross-section of returns in frontier equity markets: Integrated or segmented pricing?
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Cluster-dependent rotation-based feature selection for the RBF networks initialization
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Microstrip four-port circulator using a ferrite coupled line section
PublikacjaW artykule przedstawiono alternatywną konfigurację 4-portowego cyrkulatora zrealizowanego w technice mikropaskowych sprzężonych linii ferrytowych. Zaproponowany układ złożony jest z dwóch 3-portowych cyrkulatorów, które zostały połączone w sposób umożliwiający magnesowanie obydwu cyrkulatorów w tym samym kierunku. Wyniki numeryczne zostały zweryfikowane eksperymentalnie.
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Possible uses of crisis situation aiding system in virtual world simulation
PublikacjaMany of the real world crisis situations like spreading fire, hostile units attack, flood, and etc. are commonly used in computer games where a simulation of extensive virtual world is crucial. This paper presents some ideas for possible uses of existing crisis situation aiding system in such environments. Moreover, it shows how this kind of system can be taught during subsequent games with a large number of players. As an example...
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Electron scattering from hexafluoroacetone molecules: cross section measurements and calculations
PublikacjaZmierzono absolutne całkowite przekroje czynne na zderzenie elektronów z drobinami hexafluoroacetonu (HFA). Pomiary przeprowadzono dla energii zderzenia od 1 do 400 eV. Zależność energetyczna przekroju czynnego wykazała obecność struktur związanych z procesami o charakterze rezonansowym. Wykonano obliczenia sprężystego i jonizacyjnego przekroju czynnego dla drobin HFA i acetonu. Suma obliczonych przekrojów wykazuje dużą zgodność...
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Przekrycie stadionu piłkarskiego na EURO 2012 w Gdańsku Letnicy
PublikacjaW artykule omówiono budowę konstrukcji stalowej zadaszenia stadionu oraz używany do obliczeń model numeryczny. Przedstawiono wybrane problemy z jakimi zetknięto się w procesie projektowania, wytwarzania i budowy obietku.
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Possible uses of crisis situation aiding system in virtual world simulation
PublikacjaMany of the real world crisis situations like spreading fire, hostile units attack, flood, and etc. are commonly used in computer games where a simulation of extensive virtual world is crucial. This paper presents some ideas for possible uses of existing crisis situation aiding system in such environments. Moreover it shows how this kind of system can be taught during subsequent games with a large number of players.
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Numerical Simulation of two dimensional flow past a bridge cross section
PublikacjaThis work presents some numerical results concerning application of CFD in civil engineering problems. Selected theoretical aspects of fluid mechanics are elucidated. In the second part of the paper a cross section of upper footbridge of the Bella Sky Hotel in Copenhagen is analysed numerically in the field of wind action.
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Analiza statyczna i wytrzymałościowa konstrukcji wiszącej zadaszenia Stadionu Śląskiego
PublikacjaW artykule scharakteryzowano konstrukcję nośną zadaszenia Stadionu Śląskiego w Chorzowie, system statyczny i przyjęte rozwiązania konstrukcyjne. Przedstawiono poziom wytężenia kluczowych elementów oraz wytyczne dotyczące wzmocnienia. Analizy przeprowadzono w ramach audytu dokumentacji projektowej wykonanego na zlecenie inwestora.
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A Highly Sensitive Planar Microwave Sensor for Detecting Direction and Angle of Rotation
PublikacjaThis article presents a technique based on a modified complementary split-ring resonator (CSRR) to detect angular displacement and direction of rotation with high resolution and sensitivity over a wide dynamic range. The proposed microwave planar sensor takes advantage of the asymmetry of the sensor geometry and measures the angle of rotation in terms of the change in the relative phase of the reflection coefficients. The sensor...
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Microstrip four-port circulator using a ferrite coupled line section
PublikacjaThis paper describes an alternative configuration of a four-port circulator realized in a microstrip ferrite coupled line technology. The proposed fully planar device employs two three-port circulators consisting of a ferrite coupled line junction and T junction. Both circulators are connected through the same arm, hence, the problem of anti-parallel magnetization met in this type of circulators is avoided without the increase...
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Gender and Labor Market Situation among Technical University Graduates in Poland
PublikacjaThe aim of article is to analyse the professional situation of technical university graduates in Poland, focusing on the gender as the key impact factor. The research problem was to examine the influence of gender on the employee’s professional situation among technical university graduates in Poland. Empirical data was gained as a result of six annual quantitative research projects, conducted in the years 2012‑2017 on a total...
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Experimental examination and modification of chip suction system in circular sawing machine
PublikacjaThe article presents the results of experimental examination of the wood chip suction system in the existing sliding table saw before and after its modifi cation. The studies focused on the extraction hood of the mentioned system. The methodical experimental research of the pressure distribution inside the hood during wood chip removal for the selected rotational speed of saw blades of 3500 and 6000 min-1 with a diameter of 300...
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Thin-walled cross section shape influence on steel member resistance.
PublikacjaThis work describes why trending thin-walled technology is achieving popularity in steel construction sector. A purpose of this article is to present the influence of the cold-formed element cross-section shape on an axial compression and a bending moment resistance. The authors have considered four different shapes assuming constant section area and thickness. Calculations were based on three different steel grades taking into...
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Distortional buckling of thin-walled columns of closed quadratic cross-section
PublikacjaThe elastic stability of axially compressed column related to the cross-section distortion is investigated. Two kinds of closed quadratic cross-sections are taken into consideration with internal walls and without it. The governing differential equation is derived with aid of the principle of stationary total potential energy. The critical loads for the simply supported columns are found in an analytical form and compared with...
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Selection of main engines for hopper suction dredgers with the use oobability models
PublikacjaThis paper presents a new original method of selection of main engines for hopper suction dredgers with regard to probabilistic models. It was proposed to use the normal distribution to describe the operational loads of the main receivers. The principles for determination of parameters of load distribution and design power of the main engines were formulated. Lastly, the principles of selection of the size and number of main engines...
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Cross section calculations for electron scattering from platinum chemotherapeutic compounds
PublikacjaCross section for electron impact ionization of carboplatin, C6H12N2O4Pt, and oxaliplatin, C8H14N2O4Pt, have been calculated within binary-encounter-Bethe model for energies from the ionization threshold up to 5000 eV. Cross section for elastic electron scattering from carboplatin and oxaliplatin molecules have also been derived using independent atom method (IAM) and additivity rule for collision energies ranging from 50 eV to...
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Stability and limit load analysis of a cold-formed channel section column
PublikacjaThe paper presents stability and limit load analysis of a steel column 1440 mm high of a cold-formed channel section, subjected to a combination of compression and bending. Experimental results were compared to the resistance of a code procedure and to the outcome of numerical non-linear analysis. Comparison was made of numerical solutions by means of static (Riks) and dynamic (Explicit and Implicit) methods. Perfectly elastic...
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Internationa;isation of Firms through Networks- Empirical Evidence from Poland
PublikacjaThe aim of the article is to illustrate the role of netwiorks in the internatiuonalisation process of firms. It discuusses the evolution of academic reseach on firm internationalisation through networks and explains the relationship between network and the international behaviour of firmsas well as presnting the research results.
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Analysis of Vibration and Acoustic Signals for Noncontact Measurement of Engine Rotation Speed
PublikacjaThe non-contact measurement of engine speed can be realized by analyzing engine vibration frequency. However, the vibration signal is distorted by harmonics and noise in the measurement. This paper presents a novel method for the measurement of engine rotation speed by using the cross-correlation of vibration and acoustic signals. This method can enhance the same frequency components in engine vibration and acoustic signal. After...
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Recent total cross section measurements in electron scattering from molecules
PublikacjaThe grand-total cross sections (TCSs) for electron scattering from a range of molecules, measured over the period 2009-2019 in various laboratories, with the use of different electron transmission systems, are reviewed. Where necessary, the presented TCS data are also compared to earlier results. Collection of investigated molecular targets (biomolecules, biofuels, molecules of technological application,hydrocarbons) reflects their...
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Parametric optimization of sandwich composite footbridge with U-shaped cross-section
PublikacjaParametric optimization of sandwich composite footbridge was presented in the paper. Composite footbridge has 14,5 m long and has U-shaped cross-section with inner dimensions 2,6 × 1,3 m. The sandwich structure in made from GFRP laminate as a faces and PET foam as a core. The aim of analysis was to minimize the mass of the new footbridge that can lead to minimize the cost of structure. After optimization was conducted, the new...
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Budynek komercji stadionu na Euro 2012 w Gdańsku Letnicy
PublikacjaKonstrukcję nośną stanowi monolityczny żelbetowy szkielet płytowo-żebrowy, oparty na słupach o przekroju kołowym. Układ rzutu fundamentów i belkowania podłużnego podciągów nawiązuje do krzywolinowej trasy obwodowego pierścienia fundamentu trybun stadionu PGE Arena na Euro 2012 w Gdańsku.
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Diagnosing marine turbine engines through energy characteristics of their flow section
PublikacjaThe aim of the performed research was to develop of diagnostic method of the flow section of a marine turbine combustion engine based on the level of delamination of its energy characteristics. The here adopted diagnostic model provides for a formulation of the evaluation of the technical conditions based on the measurements of the parameters of the thermodynamic medium in the characteristic control cross-sections of the engine...
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Coupled - mode design of ferrite loaded coupled microstrip lines section
PublikacjaMetodę rodzajów sprzężonych zastosowano do analizy i projektowania sekcji ferrytowych mikropaskowych linii sprzężonych magnesowanych podłużnie (FCL). W wyniku analizy określono macierz rozproszenia sekcji oraz warunki umożliwiające jej zastosowanie do realizacji cyrkulatora projetowanego jako połączenie badanej sekcji FCL z mikropaskowym rozgałęzieniem typu T. W oparciu o opracowane oprogramowanie przeprowadzono modelowanie parametrów...
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Search safe ship trajectories in collision situation at sea by evolutionary computation
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Isomer effects on the total cross section for electron scattering from C4F6molecules.
PublikacjaZmierzono całkowity przekrój czynny (TCS) na rozpraszanie elektronów na drobinach 1,3-C4F6. Pomiary przeprowadzono w zakresie energii elektronu od 0,6do 370 eV. Wyniki porównano z TCS otrzymanym poprzednio dla 2-C4F6. Stwierdzono wpływ różnic strukturalnych na otrzymane energetyczne zależności TCS (tzw. efekt izomeryczny).