Wyniki wyszukiwania dla: geometria zawieszenia

• Multi-objective design optimization of antenna structures using sequential domain patching with automated patch size deter-mination

  Publikacja

  • S. Kozieł
  • A. Bekasiewicz

  - ENGINEERING OPTIMIZATION - Rok 2018

  In this paper, a simple yet efficient and reliable technique for fully automated multi-objective design optimization of antenna structures using sequential domain patching (SDP) is discussed. The optimization procedure according to SDP is a two-step process: (i) obtaining the initial set of Pareto-optimal designs representing the best possible trade-offs between considered conflicting objectives, and (ii) Pareto set refinement...

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• Optymalizacja długości krzywych przejściowych przy budowie i modernizacji linii kolejowych

  Publikacja

  • M. J. Nowakowski

  - Rok 2014

  W drogach szynowych przy obliczaniu długości krzywych przejściowych analizowane są jedynie warunki na ich długość minimalną. Odmienna sytuacja występuje przy projektowaniu dróg, gdzie rozpatrywane są też warunki na długość maksymalną. Spośród nich szczególną rangę ma warunek poprawności geometrycznej układu. W artykule zawarto jego adaptację do specyfiki trasy kolejowej. Sformułowano cel optymalizacji przy obliczaniu długości krzywej...

• Możliwości satelitarnej oceny położenia geometrycznego tramwajowych węzłów rozjazdowych

  Publikacja

  • W. Koc
  • C. Specht
  • P. Chrostowski
  • J. Szmagliński

  - Zeszyty Naukowo-Techniczne Stowarzyszenia Inżynierów i Techników Komunikacji w Krakowie. Seria: Materiały Konferencyjne - Rok 2013

  W referacie skupiono się na kwestii oceny złożonych układów geometrycznych linii tramwajowych, w rejonach krańcówek, ze szczególnym uwzględnieniem węzłów rozjazdowych. Przedstawiono wyniki ciągłych pomiarów satelitarnych przeprowadzonych w eksploatowanym torze. Omówiono metodykę opracowywania wyników, uwzględniającą specyfikę projektowania rozjazdów tramwajowych. Stwierdzono poprawność geometrycznego ukształtowania badanych układów,...

• Reliable method of assessing fracture properties of asymmetric bonded joints

  Publikacja

  • J. Tysarczyk
  • M. Budzik
  • J. Jumel
  • K. Imielińska
  • M. Shanahan

  - Advances in Materials Science - Rok 2010

  Two methods of assessing fracture properties of adhesive joints were studied. Two wedge tests: with continuous deflection and with force measurements were compared. Asymmetric geometry of the bonded joint was considered, i.e. two different plates of aluminium alloys: Al-Cu and Al-Mg, were bonded with epoxy DGEBA adhesive. The analytical model is shown to estimate the values of fracture properties: crack position and critical fracture...

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• Design of horizontal axis wind and water turbines

  Publikacja

  • T. Koronowicz
  • J. Szantyr

  - Rok 2016

  The basic hydrodynamic principles of horizontal axis turbines are presented. Computational methods based on vortex theory for design of such turbines and for calculation of their hydro or aerodynamic characteristics are described in detail. These methods are applicable both to wind and water turbines. The influence of detailed turbine geometry on its characteristics is presented. Several practical computational examples of different...

• Expedited two-objective dimension scaling of compact microwave passives using surrogate models

  Publikacja

  • S. Kozieł
  • A. Bekasiewicz
  • Q. S. Cheng

  - Rok 2016

  Geometry scaling of compact microwave structures is a challenging problem because of complex relationships between the physical dimensions and electrical characteristics, mostly caused by considerable cross-couplings in densely arranged layouts. Here, a procedure for expedited dimension scaling of compact microwave couplers with respect to two independent criteria has been presented. Our approach involves inverse surrogate models...

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• Sliding bearings with sintered bronze bush lubricated by contaminated water with solid particles – Theoretical and experimental studies

  Publikacja

  • W. Litwin
  • S. Kropp

  - WEAR - Rok 2023

  Sliding journal bearings lubricated with water coming directly from the environment are a solution used in shipbuilding, pumps and hydropower. However, the working fluid or surrounding water cannot always be filtered because of design limitations, which often causes the problem of premature wear of these sensitive bearings. The research conducted made it possible to assess the wear of sliding bearings lubricated with water containing...

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• Flexoelectricity and apparent piezoelectricity of a pantographic micro-bar

  Publikacja

  • V. Eremeev
  • J. Ganghoffer
  • V. Konopińska-Zmysłowska
  • N. Uglov

  - INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE - Rok 2020

  We discuss a homogenized model of a pantographic bar considering flexoelectricity. A pantographic bar consists of relatively stiff small bars connected by small soft flexoelectric pivots. As a result, an elongation of the bar relates almost to the torsion of pivots. Taking into account their flexoelectric properties we find the corresponding electric polarization. As a results, the homogenized pantographic bar demonstrates piezoelectric...

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• Parametrical 3D model of an asynchronous motor - AutoCAD application.

  Publikacja

  • A. Wilk
  • G. A. Kostro
  • P. Dobrowolski

  - Rok 2004

  A computer program for automatic drawing of 3D models of squirrel-cage induction motors is presented in this paper. The created model of a machine is of parametrical nature, which means that the user defines geometry of particular elements (shaft, stator core, bearing, windings etc.) on the basis dimensions and some other parameters e.g. type of bearing, kind of winding, number of slots. This program is useful for 3D modelling...

• The structure, including stereochemistry, of levorin A1

  Publikacja

  • K. Szwarc-Karabyka
  • P. Szczeblewski
  • P. Sowiński
  • E. Borowski
  • J. Pawlak

  - MAGNETIC RESONANCE IN CHEMISTRY - Rok 2015

  The constitution and stereostructure of levorin A1 1, an aromatic heptaeneantifungal antibiotic, was established on the basis of NMR studies, which contained DQFCOSY,ROESY, HSQC and HMBC experiments. Mycosamine moiety was used as an internalchiral probe to determine the absolute configuration of levorin A1 stereogenic centers: 13S,15R, 17S, 18R, 19S, 21R. The relative configuration of the remaining stereogenic centers wasassigned...

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• Revalorisation of the Szewalski’s concept of the law of varying the last-stage blade retraction in a gas-steam turbine

  Publikacja

  • P. Ziółkowski
  • S. Głuch
  • T. Kowalczyk
  • J. Badur

  - E3S Web of Conferences - Rok 2021

  The article presents the implementations of the free vortex law to the blade of the last stage of a gas-steam turbine. First, a thermodynamic analysis was carried out, determining the parameters at the inlet, then the number of stages of the high and low-pressure part of the turbine was constructed, together with the kinematics and velocity vectors for subsequent stages of the axial turbine. The last step of article was to take...

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• Local Mesh Deformation for accelerated parametric studies based on the Finite Element Method

  Publikacja

  • M. Mul
  • G. Fotyga
  • M. Mrozowski

  - Rok 2017

  This paper presents an approach for enhancing the efficiency of two-dimensional Finite Element Method analysis in parametric studies or optimisation process of microwave components. The new approach involves local mesh deformation applied near the elements that are modified during computations. Since in the proposed approach the topology of the mesh remains unchanged, a new mesh does not have to be generated from scratch when the...

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• Organic filed effect transistor with zinc phthalocyanine.

  Publikacja

  • E. Metel
  • G. Jarosz

  - Scientific Bulletin. Physics / Technical University of Łódź - Rok 2006

  W pracy przedstawiono wyniki badań doświadczalnych organicznego tranzystora polowego z warstwą ftalocyjaniny cynku. Jako podłoże zastosowano wysoko domieszkowane wafle krzemu pokryte warstwą tlenku krzemu (IV) o grubości 100 nm, na którą techniką fotolitograficzną była naniesiona struktura elektrod (tzw. geometria dolnych kontaktów). Złote elektrody źródła i drenu tworzyły kanał o długości 5 m (jest to odległość między elektrodą...

• Preliminary design of the last stage of supercritical steam turbine and proposition of anti-erosion coating for blades surface

  Publikacja

  • A. Milewska
  • S. Głuch
  • A. Zykova
  • S. Vladimir

  - Przegląd Mechaniczny - Rok 2017

  In this article a preliminary design of the last stage of supercritical steam turbine has been presented. A computational model of supercritical thermal cycle has been created in order to determine steam parameters at the stage inlet and outlet. The model was based on the structure of German coal-fired power plant Datteln 4. Further steam-flow parame-ters and dimensions of stator and rotor blades have been calculated analytically....

• Analysis of magnetic field of Hemholtz's coils and ferromagnetic objects

  Publikacja

  • M. Wołoszyn
  • J. Wołoszyn
  • A. Młyński

  - Rok 2007

  The 3-axis fluxgate magnetometer requires conducting a precise calibration in the magnetic field whose value is determined and which is characterized by the high uniformity of the distribution of the field, especially along the axis of the sensors. The generation of the magnetostatic field characterized by the high uniformity, can be achieved by using the Helmholtz's coils. The requirements of the uniformity of distribution of...

• A review of phase change materials and heat enhancement methodologies

  Publikacja

  • M. Saqib
  • R. Andrzejczyk

  - Wiley Interdisciplinary Reviews-Energy and Environment - Rok 2023

  Phase change materials (PCMs) are an efficient alternative to store and release heat at a specific range of temperature. Here PCMs and heat enhancement methodologies for PCM storage are reviewed. A short overview of PCMs and their applications is presented in addition to the progress during the last 10 years. Heat enhancement techniques, that is, extended surfaces, multiple and composite PCMs, and encapsulation techniques, are...

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• Simplified Method of Modelling Behaviour of Ship in Waves with Partially Flooded Compartments

  Publikacja

  • P. Szulczewski

  - Transactions on Maritime Science-ToMS - Rok 2021

  This paper contains a description of a numerical model for calculating behaviour of ships in waves. There are many models available, but the one described here can be characterised with a set of parameters that have a decisive impact on the final values of roll motion amplitude and frequency. In this paper, it is shown how a fitting of a standard-shape hull characterised by certain readily available parameters affects...

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• Study on deformed steel columns subjected to impact load due to soft-storey failure in buildings during earthquakes

  Publikacja

  • W. Migda

  - Rok 2013

  The so called soft-storey failure is one of the most typical types of damage induced in buildings as the result of earthquake excitation. It has been observed during ground motions that the failure of an upper soft storey of a structure results in large vertical impact load acting on the lower floors. If the resistance of the structural members of the lower storeys is not sufficient it may further lead to progressive collapse of...

• Modelowanie i pomiary nagłośnienia audytorium

  Publikacja

  • H. Lasota
  • R. Mazurek

  - Measurement Automation Monitoring - Rok 2008

  Uwaga projektantów systemów nagłośnieniowych zogniskowana jest na tzw. akustyce pomieszczenia, w którym realizowany jest przekaz słowny. Zjawiska pogłosowe związane z geometrią sali audytoryjnej, wynikające z wielokrotnych odbić fali dźwiękowej uznawane są za dominujące. Artykuł podejmuje niedoceniany problem wpływu liczby i rozmieszczenia głośników w sali na jakość przekazu. Superpozycji sygnałów dochodzących do słuchacza z wielu...

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• Methods for quality improvement of multibeam and LiDAR point cloud data in the context of 3D surface reconstruction

  Publikacja

  • M. Kulawiak
  • Z. Łubniewski

  - HYDROACOUSTICS - Rok 2016

  Point cloud dataset is the transitional data model used in several marine and land remote-sensing applications. During further steps of processing, the transformation of point cloud spatial data to more complex models containing higher order geometric structures like edges and facets may be possible, if an appropriate quality level of input data is provided. Point cloud datasets usually contain a considerable amount of undesirable...

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• Modelowanie nierównomiernego nasycenia nabiegunnika generatora synchronicznego

  Publikacja

  • F. Kutt
  • M. Michna
  • G. A. Kostro
  • M. Ronkowski

  - Maszyny Elektryczne : zeszyty problemowe - Rok 2014

  W artykule przedstawiono koncepcję modelu obwodowego generatora synchronicznego (GS) w układzie współrzędnych naturalnych. W równaniach modelu uwzględniono zarówno niesinusoidalny rozkład uzwojeń, jak i nierównomierne nasycenie nabiegunników. Do wyznaczenia indukcyjności własnych i wzajemnych uzwojeń GS zastosowano zmodyfikowaną metodę funkcji opisujących rozłożenie przestrzenne uzwojeń. Nierównomierne nasycenie nabiegunników GS...

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• Impact of diffusion coefficient averaging on solution accuracy of the 2D nonlinear diffusive wave equation for floodplain inundation

  Publikacja

  • D. Gąsiorowski

  - JOURNAL OF HYDROLOGY - Rok 2014

  In the study, the averaging technique of diffusion coefficients in the two-dimensional nonlinear diffusive wave equation applied to the floodplain inundation is presented. As a method of solution, the splitting technique and the modified finite element method with linear shape functions are used. On the stage of spatial integration, it is often assumed that diffusion coefficient is constant over element and equal to its average...

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• Study of railway traffic safety based on the railway track condition monitoring system

  Publikacja

  • S. Kliuiev
  • I. Medvediev
  • N. Khalipova

  - Rok 2020

  The solution to the problem of monitoring the railway track, as well as potentially dangerous objects and phenomena in the adjacent territories, is determined by the need to implement increased requirements for traffic safety (primarily to the geometric parameters of the devices of a long railway track under construction and functioning load-bearing highways), prevention of technological disasters and large-scale negative effects...

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• Jumping Wave Characteristic during Low Plasticity Burnishing Process

  Publikacja

  • S. Dzionk
  • M. Dobrzyński
  • B. Ścibiorski

  - Materials - Rok 2021

  During the low plasticity burnishing process of soft materials such as carbon steel with a hardness of up to 40 HRC (Rockwell grade) a raised structure of the material known as the Jumping Wave forms in front of the tool roll. This phenomenon significantly disturbs the burnishing process, but is very poorly described in the literature. This article presents studies of this phenomenon on the example of burnished 1.0562 steel. The...

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• The symmetric extendibility of quantum states

  Publikacja

  • M. Nowakowski

  - Journal of Physics A-Mathematical and Theoretical - Rok 2016

  Studies on the symmetric extendibility of quantum states have become particularly important in the context of the analysis of one-way quantum measures of entanglement, and the distillability and security of quantum protocols. In this paper we analyze composite systems containing a symmetric extendible part, with particular attention devoted to the one-way security of such systems. Further, we introduce a new one-way entanglement...

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• The structure of levorin A3, a minor component of levorin complex

  Publikacja

  • J. Pawlak
  • P. Sowiński
  • T. Bieszczad
  • E. Borowski

  - Rok 2005

  Budowa chemiczna składnika kompleksu leworyn, leworyny A3, została ustalona na podstawie analizy z wykorzystaniem metod spektroskopowych UV, MS i NMR metoksykarbonylometyloamido pochodnej leworyny A3. Widmo UV wskazało obecność chromoforu heptaenowego. Ciężar cząsteczkowy leworyny A3 ustalono jako 1110 j.m. za pomocą spektrometrii masowej z wykorzystaniem techniki FAB, co po uwzględnieniu uwarunkowań biogenetycznych pozwoliło wydedukować...

• Examples of numerical simulations of two-dimensional unsaturated flow with VS2DI code using different interblock conductivity averaging schemes

  Publikacja

  • A. Szymkiewicz
  • W. Tisler
  • K. Burzyński

  - GEOLOGOS - Rok 2015

  Flow in unsaturated porous media is commonly described by the Richards equation. This equation is strongly nonlinear due to interrelationships between water pressure head (negative in unsaturated conditions), water content and hydraulic conductivity. The accuracy of numerical solution of the Richards equation often depends on the method used to estimate average hydraulic conductivity between neighboring nodes or cells of the numerical...

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• Proton hydration in aqueous solution: FTIR studies of HDO spectra

  Publikacja

  • M. Śmiechowski
  • J. Stangret

  - JOURNAL OF CHEMICAL PHYSICS - Rok 2006

  W artykule scharakteryzowano sfery hydratacyjne protonu w roztworze wodnym na podstawie pomiarów widm FTIR wody półciężkiej (HDO), rozcieńczonej izotopowo w H2O. Wyniki eksperymentalne skonfrontowano z obliczonymi metodami chemii kwantowej strukturami niewielkich klasterów wodnych typu H+(H2O)n. Otrzymane geometrie optymalne porównano z odległościami międzyatomowymi otrzymanymi na podstawie położeń pasm HDO. Pierwsza sfera hydratacyjna...

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• Numerical analysis on axial capacity of steel built-up battened columns

  Publikacja

  • P. Pieczka
  • P. Iwicki

  - Archives of Civil Engineering - Rok 2022

  This paper deals with the numerical analysis aimed at study the bearing capacity of pinended steel built-up columns under axial compression. Finite element (FE) models were performed for the columns presented in the literature. The main problem discussed in the article is the shape and magnitude of geometric imperfections introduced into the numerical FE model, necessary to obtain the load capacity consistent with the experimental...

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• Influence of nonlinearities on the efficiency and accuracy of FEM calculations on the example of a steel build-up thin-walled column

  Publikacja

  • P. Deniziak
  • K. Winkelmann

  - MATEC Web of Conferences - Rok 2018

  Due to the increase of computing capabilities of standard processing units, it is possible to perform complex analyses, considering a number of nonlinearities, such as geometric, material and boundary (contact) even on personal computers. In the paper, the authors have analysed the efficiency and accuracy of standard PC’s FEM calculations performed in Abaqus CAE 2017 software on the example of a critical load assessment of a thin-walled...

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• (CsX)Cu5O2(PO4)2 (X = Cl, Br, I): A Family of Cu2+ S = 1/2 Compounds with Capped-Kagomé Networks Composed of OCu4 Units

  Publikacja

  • M. J. Winiarski
  • T. Tran
  • J. Chamorro
  • T. McQueen

  - INORGANIC CHEMISTRY - Rok 2019

  Three new salt inclusion compounds (CsX)Cu5O2(PO4)2 (X = Cl, Br, I), phosphate analogues of the kagomé mineral averievite, are reported. Their crystal structures are composed of trigonal networks of corner-sharing OCu4 anion-centered tetrahedra, forming capped-kagomé planes, which can also be regarded as two-dimensional slices along the [111] direction of a pyrochlore lattice. Magnetization and heat capacity measurements reveal...

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• Application of linear buckling sensitivity analysis to economic design of cylindrical steel silos composed of corrugated sheets and columns

  Publikacja

  • P. Iwicki
  • M. Sondej
  • J. Tejchman

  - ENGINEERING FAILURE ANALYSIS - Rok 2016

  The paper deals with global stability of steel cylindrical silos composed of corrugated walls and vertical columns with loads imposed by a bulk solid following Eurocode 1. The optimum silo design with respect to the steel weight was based on a sensitivity analysis method. The changes of silo column profiles at each design step were performed by means of influence lines for the buckling load factor due to the unit column bending...

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• Acoustic journal bearing – Performance under various load and speed conditions speed conditions

  Publikacja

  • T. Stolarski
  • R. Gawarkiewicz
  • K. Tesch

  - TRIBOLOGY INTERNATIONAL - Rok 2016

  The paper presents results of experimental testing aiming at finding out what effect system of piezo-electric actuators (PZTs)attached to an aerodynamic journal bearing has on the magnitude of shaft's motion within the bearing operating at specified speed and load. The results clearly demonstrate effectiveness of PZTs in mitigating the shaft's motion thus contributing to the increased stability of the bearing. This stabilizing...

• Expedited EM-driven multi-objective antenna design in highly-dimensional parameter spaces

  Publikacja

  • S. Kozieł
  • A. Bekasiewicz
  • W. Zieniutycz

  - IEEE Antennas and Wireless Propagation Letters - Rok 2014

  A technique for low-cost multi-objective optimization of antennas in highly-dimensional parameter spaces is presented. The optimization procedure is expedited by exploiting fast surrogate models, including coarse-discretization EM antenna simulations and response surface approximations (RSA). The latter is utilized to yield an initial set of Pareto non-dominated designs which are further refined using response correction methods....

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• Minimal surfaces and conservation laws for bidimensional structures

  Publikacja

  • V. Eremeev

  - MATHEMATICS AND MECHANICS OF SOLIDS - Rok 2022

  We discuss conservation laws for thin structures which could be modeled as a material minimal surface, i.e., a surface with zero mean curvatures. The models of an elastic membrane and micropolar (six-parameter) shell undergoing finite deformations are considered. We show that for a minimal surface, it is possible to formulate a conservation law similar to three-dimensional non-linear elasticity. It brings us a path-independent...

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• Elastoplastic nonlinear FEM analysis of FGM shells of Cosserat type

  Publikacja

  • S. Burzyński
  • J. Chróścielewski
  • K. Daszkiewicz
  • W. Witkowski

  - COMPOSITES PART B-ENGINEERING - Rok 2018

  The paper is a continuation of [1] where the formulation of the elastic constitutive law for functionally graded materials (FGM) on the grounds of nonlinear 6-parameter shell theory with the 6th parameter (the drilling degree of freedom) was presented. Here the formulation is extended to the elasto-plastic range. The material law is based on Cosserat plasticity and employs the well-known Tamura-Tomota-Ozawa (TTO) [2] mixture...

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• ANALYSIS OF THE LOAD-CARRYING CAPACITY OF A HYDRODYNAMIC WATER-LUBRICATED BEARING IN A HYDROELECTRIC POwER PLANT

  Publikacja

  • A. Olszewski
  • T. Żochowski
  • G. Gołębiewski

  - TRIBOLOGIA - Rok 2018

  The paper presents an analysis of the load-carrying capacity of a historic hydrodynamic water-lubricated radial bearing of an unconventional segment design installed in the Braniewo Hydroelectric Power Plant. The aim of the calculations was to determine whether the bearing operates in the conditions of hydrodynamic or mixed lubrication, as well as to establish the optimal geometry of the axial grooves allowing for the highest load-carrying...

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• WEAR OF Si OR B DOPED AMORPHOUS CARBON COATINGS

  Publikacja

  • K. Druet
  • J. Łubiński
  • A. Neyman

  - TRIBOLOGIA - Rok 2016

  The paper describes a complex wear research on DLC (amorphous carbon) moped with boron (B) and silicone (Si). The tests were carried out in two different sliping systems: flat–on–flat (ring contact, unidirectional sliding) and ball–on–flat (reciprocating sliding). Water and medical saline solutions were used as lubricants. A comparative analysis of the results revealed differences in the initiation and progress of wear and the...

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• Kinematyczne pomiary GNSS na linii kolei wąskotorowej w Koszalinie

  Publikacja

  • C. Specht
  • J. Szmagliński
  • P. Gajdzica

  - Logistyka - Rok 2014

  W artykule opisano metodę kinematycznych pomiarów geodezyjnych GNSS zastosowaną dla inwentaryzacji trasy kolejowej w terenie silnie zalesionym. W badaniach wskazano możliwości wykorzystania tej metody dla inwentaryzacji układu geometrycznego trasy kolei wąskotorowej w Koszalinie. Opisano najważniejsze różnice pomiędzy koleją o rozstawie szyn 1000 mm a 1435 mm oraz przyszłościowe zagadnienie planowanej rewitalizacji tego odcinka....

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• Porównanie obciążenia wiatrem wyznaczonego na podstawie procedur normowych z wynikami symulacji w cyfrowym tunelu aerodynamicznym dla hali stalowej.

  Publikacja

  • W. Migda
  • M. Gordziej-Zagórowska
  • P. Deniziak
  • W. Leszczyńska

  - Builder - Rok 2023

  W niniejszych badaniach porównano obciążenia od wiatru wyznaczonego metodą normową oraz w cyfrowym tunelu aerodynamicznym. Analizom poddano typowy budynek hali na planie prostokąta z dwuspadowym dachem w czterech wariantach geometrycznych. W pierwszym etapie budynki zwymiarowano bazując na obciążeniach od wiatru wyznaczonych według Eurokodu. Następnie dla poszczególnych elementów konstrukcyjnych określono poziom wytężenia. Dla...

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• Synthesis and characterization of mononuclear Zn(II), Co(II) and Ni(II) complexes containing a sterically demanding silanethiolate ligand derived from tris(2,6-diisopropylphenoxy)silanethiol

  Publikacja

  • A. Dołęga
  • A. Jabłońska
  • A. Pladzyk
  • Ł. Ponikiewski
  • W. Ferenc
  • J. Sarzyński
  • A. Herman

  - DALTON TRANSACTIONS - Rok 2014

  Four heteroleptic complexes of zinc(II), cobalt(II) and nickel(II) containing a monodentate silanethiolate ligand derived from tris(2,6-diisopropylphenoxy)silanethiol (TDST), were prepared and characterized. The geometries of ligands in the complexes are typical: distorted tetrahedral in zinc and cobalt(II) complexes and square planar in nickel(II) compound. Magnetic studies performed for Ni(II) and Co(II) compounds confirm the...

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• A pin-on-disc study of airborne wear particle emissions from studded tyre on concrete road contacts

  Publikacja

  • U. Olofsson
  • M. Tu
  • O. Nosko
  • Y. Lyu
  • S. Dizdar

  - WEAR - Rok 2018

  Studded tyres wear surfaces of winter roads, generating inhalable airborne particles. In this study, four concrete road materials and two stud geometries were investigated in terms of wear, road material hardness and airborne particle concentration. The sliding contact between studded tyres and road materials was studied using a pin-on-disc machine in a clean chamber. The results show that the normal load and the stud size have...

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• A comparative performance assessment of a hydrodynamic journal bearing lubricated with oil and magnetorheological fluid

  Publikacja

  • F. Quinci
  • W. Litwin
  • M. Wodtke
  • R. van den Nieuwendijk

  - TRIBOLOGY INTERNATIONAL - Rok 2021

  This work presents the investigation results of a journal bearing lubricated with magnetorheological fluid that is activated by a local constant magnetic field to vary both the local flow resistance and pressure. The bearing performance is assessed via Finite Element Modelling (FEM) and results are corroborated by experiments. The FEM model uses the Bingham model to describe the fluid film. A dedicated test rig is used to assess...

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• The effect of gold shape and size on the properties and visiblelight-induced photoactivity of Au-TiO2

  Publikacja

  • A. Gołąbiewska
  • A. Malankowska
  • M. Jarek
  • W. Lisowski
  • G. Nowaczyk
  • S. Jurga
  • A. Zaleska-Medynska

  - APPLIED CATALYSIS B-ENVIRONMENTAL - Rok 2016

  tIn the present investigation, TiO2modified with a different geometry and size of gold particles, suchas nanospheres (NSPs), nanostars (NSTs) and nanorods (NRs), were prepared by the immobilizationmethod. The effect of the gold shape, size and TiO2matrix type (TiO2microspheres or rutile TIO-6 TiO2)were systematically investigated. The obtained photocatalysts were thoroughly characterized by UV–visdiffuse-reflectance spectroscopy...

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• The Influence of Articular Cartilage Thickness Reduction on Meniscus Biomechanics

  Publikacja

  • P. Łuczkiewicz
  • K. Daszkiewicz
  • J. Chróścielewski
  • W. Witkowski
  • P. Winklewski

  - PLOS ONE - Rok 2016

  Objective Evaluation of the biomechanical interaction between meniscus and cartilage in medial compartment knee osteoarthritis. Methods The finite element method was used to simulate knee joint contact mechanics. Three knee models were created on the basis of knee geometry from the Open Knee project. We reduced the thickness of medial cartilages in the intact knee model by approximately 50% to obtain a medial knee osteoarthritis...

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• Activation Energy and Inclination Magnetic Dipole Influences on Carreau Nanofluid Flowing via Cylindrical Channel with an Infinite Shearing Rate

  Publikacja

  • A. Ayud
  • T. Sajid
  • W. Jamshed
  • R. W. M. Zamora
  • A. L. V. More
  • M. L. Talledo
  • I. N. R. O. de Peña
  • S. Hyssain
  • M. B. Hafeez
  • M. Krawczuk

  - Applied Sciences-Basel - Rok 2022

  The infinite shear viscosity model of Carreau fluid characterizes the attitude of fluid flow at a very high/very low shear rate. This model has the capacity for interpretation of fluid at both extreme levels, and an inclined magnetic dipole in fluid mechanics has its valuable applications such as magnetic drug engineering, cold treatments to destroy tumors, drug targeting, bio preservation, cryosurgery, astrophysics, reaction kinetics,...

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• UAV Photogrammetry under Poor Lighting Conditions—Accuracy Considerations

  Publikacja

  • P. Burdziakowski
  • K. Bobkowska

  - SENSORS - Rok 2021

  The use of low-level photogrammetry is very broad, and studies in this field are conducted in many aspects. Most research and applications are based on image data acquired during the day, which seems natural and obvious. However, the authors of this paper draw attention to the potential and possible use of UAV photogrammetry during the darker time of the day. The potential of night-time images has not been yet widely recognized,...

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• Expedited Re-Design of Multi-Band Passive Microwave Circuits Using Orthogonal Scaling Directions and Gradient-Based Tuning

  Publikacja

  • S. Kozieł
  • A. Pietrenko-Dąbrowska
  • U. Ullah

  - Scientific Reports - Rok 2024

  Geometry scaling of microwave circuits is an essential but challenging task. In particular, the employment of a given passive structure in a different application area often requires re-adjustment of the operating frequencies/bands while maintaining top performance. Achieving this necessitates utilization of numerical optimization methods. Nonetheless, if the intended frequencies are distant from the ones at the starting point,...

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• On Computationally-Efficient Reference Design Acquisition for Reduced-Cost Constrained Modeling and Re-Design of Compact Microwave Passives

  Publikacja

  • S. Kozieł
  • A. Pietrenko-Dąbrowska

  - IEEE Access - Rok 2020

  Full-wave electromagnetic (EM) analysis has been playing a major role in the design of microwave components for the last few decades. In particular, EM tools allow for accurate evaluation of electrical performance of miniaturized structures where strong cross-coupling effects cannot be adequately quantified using equivalent network models. However, EM-based design procedures (parametric optimization, statistical analysis) generate...

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• The new diphosphanylphosphido complexes of tungsten(VI) and molybdenum(VI). Their synthesis, structures and properties

  Publikacja

  • A. Wiśniewska
  • R. Grubba
  • Ł. Ponikiewski
  • M. Zauliczny
  • J. Pikies

  - DALTON TRANSACTIONS - Rok 2018

  We report on the reactivity of R2P–P(Li)–PR’2 (R = tBu, iPr, R’ = NEt2, iPr) towards diimido complexes [(dippN)2MCl2·dme] (M = Mo, W and dipp = 2,6-iPr2C6H3). A series of new complexes with diphosphanylphosphido ligands R2P–P–PR’2 were isolated. The solid-state structures of [(dippN)2M(Cl)(1,2-η-iPr2P–P– PiPr2)] (2Mo and 2W) and [(dippN)2M(Cl){1,2-η-tBu2P–P–P(NEt2)2}] (3Mo and 3W) were established by single-crystal X-ray diffraction...

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