Katalog Czasopism

• KOLMOGOROV EQUATION SOLUTION: MULTIPLE SCATTERING EXPANSION AND PHOTON STATISTICS EVOLUTION MODELING

  Publikacja

  • M. Guirao Galcera
  • S. Leble

  - TASK Quarterly - Rok 2014

  We consider a formulation of the Cauchy problem for the Kolmogorov equation which corresponds to a localized source of particles to be scattered by a medium with a given scattering amplitude density. The multiple scattering amplitudes are introduced and the corresponding series solution of the equation is constructed. We investigate the integral representation for the first series terms, its estimations and values of the photon...

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• Novel Analytic-Numerical Model of Free Convection: with Leading Edge Considered

  Publikacja

  • S. Leble
  • W. Lewandowski

  - TASK Quarterly - Rok 2014

  A novel solution of the free convection boundary problem is represented in analytical form for velocity and temperature for an isothermal vertical plate, as an example. These fields are built as a Taylor Series in the x coordinate with coefficients as functions of the vertical coordinate (y). We restrict ourselves by cubic approximation for both functions. The basic Navier-Stokes and Fourier-Kirchhoff equations and boundary conditions...

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• NUMERICAL SIMULATIONS OF GAP FLOW ABOVE ROTATING DISK

  Publikacja

  • F. Wasilczuk
  • P. Flaszyński
  • P. Doerffer

  - TASK Quarterly - Rok 2015

  A rotating disk can be considered a basic configuration for the investigati ons of the impact of various conditions on the flow through the clearance between the s hrouded turbine blade and the casing. Numerical calculations using Fine/Turbo Numeca were conducted to examine the influence of the rotational velocity and the pressure differ ence across the disk on the flow conditions, especially the mass flow through the clearance....

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• KOALA Graph Theory Internet Service

  Publikacja

  • K. Giaro
  • K. Ocetkiewicz
  • T. Goluch

  - TASK Quarterly - Rok 2015

  KOALA has been created with the idea of C++ library templates, implementing a broad set of procedures in the fields of algorithmic graph theory and network problems in discreate optimization. During the C2NIWA project, a library has been greatly ectended, the code refactored and enclosed with the internet service available in the public repository of thr project. Today it contains interconnected educational materials in the form...

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• KASKADA Platform in Cloud Environment

  Publikacja

  • H. Krawczyk
  • J. Proficz
  • B. Daca

  - TASK Quarterly - Rok 2015

  KASKADA is a computing platform for developing and running services and applications oriented to multimedia processing and data streaming. A solution for serving the platform in the PaaS model is presented. The paper briefly describes the software for creating the private cloud environment based on the OpenStack software. The coud has been deployed to a supercomputer working in C2 NIWA at the Gdansk University of technology. This...

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• WIKI-WS as a C2 NIWA Web Service Management Platform

  Publikacja

  • M. Downar

  - TASK Quarterly - Rok 2015

  The Wiki-WS platform was implemented within the C2 NIWA project for production purposes. Wiki-WS stands for developing, managing and maintaining web services. The production deployment needed implementation of several functional improvements and establishing a strong security 7 safety policy. The WikiWS platform has to be used as an educational environmement for developing web sevices and production environment for execution of...

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• Retrieval of Heterogeneus Sevices in C2NIWA Repository

  Publikacja

  • J. Szymański

  - TASK Quarterly - Rok 2015

  The paper reviews the methods used for retrieval of information and services. The selected approaches presented in the review inspired us to build retrieval mechanisms in a system for searching the resources stored in the C2NIWA repository. We describe the architecture of the system, its functions and the surrounding subsystems to which it is related. For retrieval of C2NIWA sevices we propos three approaches based on: keyword...

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• Service Recommendation on WIKI-WS Platform

  Publikacja

  • A. Sobecki

  - TASK Quarterly - Rok 2015

  The article presents the issues of recaommendation services for users. The commonly used solutions include known classes of recommendation systems and information about their area of use and the most frequently used algorithms. the issue of choosing the services has been described based on the Wiki-WS platform including a model of cooperation with the recommendation system. The conclusion from the analysis of the proposed model...

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• Business Process Modelling and Enterprise Improvement Analysis

  Publikacja

  • K. Dziubich

  - TASK Quarterly - Rok 2015

  The main trends in developing an approach and tools for business process modelling are discussed. Business Process Management (BPM) and BPM Notation (BPMN) are presented. Moreover, the possibilities of C2NIWA in a wide range of these tools running on a supercomputer are suggested. Firstly, the company development strategy can be planned . Secondly, quick and flexible changes of its processes can be modelled, analysed and implemented....

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• IT PROJECT TEAMS CREATION AND ANALYSIS IN C2 NIWA ENVIRONMENT

  Publikacja

  • B. Krawczyk-Bryłka

  - TASK Quarterly - Rok 2015

  Teams are the basic unit of the C2NIWA community, which – using the technical capabilities of this environment – focuses on the implementation of various projects. This article presents one of the competitions carried out within the framework of a C2NIWA project called Uwaga! Upadek! [Attention! Fall!], used as an example of a collaborative project for which analyses related to the assessment of teamwork based on the input-process-result...

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• C2 Niwa - The Centre of Competence for Novel Infrastructure of Workable Applications

  Publikacja

  • H. Krawczyk

  - TASK Quarterly - Rok 2015

  Scientific and cloud computing are discussed in the paper . The paradigm of EaaS (Everything as a Service) is presented and the design methodology of service oriented applications is proposed. Implementation of the SOSE (Software Oriented Software Engineering) approach is analyzed and the roles of developing teams to obtain software products satisfying business requirements are also shown. The above listed activities create a basic...

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• Adaption of Open Science Paradigm at Gdańsk University of Technology

  Publikacja

  • T. M. Boiński

  - TASK Quarterly - Rok 2015

  Open Access plays growing role in sharing results of today's research. The movement is very strong and many Universities, including Gdańsk University of Technology, are adapting this approach. This paper presents general information about Open Access movement and the approach adapted by the Gdańsk University of Technology. The components of Open Science platform as well as the procedures are described.

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• BeesyCluster as Front-End for High Performance Computing Services

  Publikacja

  • P. Czarnul

  - TASK Quarterly - Rok 2015

  The paper presents the BeesyCluster system as a middleware allowing invocation of services on high performance computing resources within the NIWA Centre of Competence project. Access is possible through both WWW and SOAP Web Service interfaces. The former allows non-experienced users to invoke both simple and complex services exposed through easyto-use servlets. The latter is meant for integration of external applications with...

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• Acceptance Testing of Software Products for Cloud-Based On-Line Delivery

  Publikacja

  • B. Wiszniewski

  - TASK Quarterly - Rok 2015

  Software products intended for on-line delivery by distributors serving an open community of subscribers are developed in a specific life-cycle model, in which roles of the major stakeholders are strongly separated, unlike in any other software development model known in software engineering. Its specificity underlines the fact that a distributor of the final product, responsible for its acceptance for publication and delivery...

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• Modern Methods of Software Development

  Publikacja

  • D. Zima

  - TASK Quarterly - Rok 2015

  Software development methods consist of such activities like analysis, planning, development, testing, deployment, maintenance and retirement. All of them can be divided into two main categories - traditional and agile. The objective of this paper is to review some of the most popular traditional, agile and open source development methods. Special attention was paid to the common stages of all methods - testing and maintenance.

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• Real-Time connection Between Immerse 3D Vizualization Laboratory and Kaskada Platform

  Publikacja

  • Ł. Wiszniewski
  • T. Ziółkowski

  - TASK Quarterly - Rok 2015

  Multimedia stream processing into two cooperative different systems (cluster platform and virtual lab) is considered. The considered selected information about the systems is presented and the idea of its communication when executing the distributed application is proposed. A general schema of the communication architecture is given. Tests of data transmission quality are considered and their results are presented.

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• On Invariants of Fluid Mechanics Tensors

  Publikacja

  • K. Tesch

  - TASK Quarterly - Rok 2013

  This paper presents physical interpretations of the first and second invariants of tensors of fluid mechanics. Some examples of elementary applications and meanings are also given.

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• Study of Icosahedral Clusters in Close-packed Simple Liquids

  Publikacja

  • A. Kozub

  - TASK Quarterly - Rok 2012

  The local structure of liquid copper was determined using Steinhardt order parameters, with particular attention paid to icosahedral clusters. The positions of atoms were obtained from three sets of molecular dynamics simulations, with the forces obtained from: the Sutton-Chen (SC) potential, the Naval Research Laboratory total energy tight-binding (NRL-TB) method and the divide-and-conquer learn-on-the-fly (DCLOTF) method, respectively....

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• Implementation of the Boundary Element Method to Two-Dimensional Heat Transfer with Thermal Bridge Effects

  Publikacja

  • M. Lewandowski

  - TASK Quarterly - Rok 2013

  The work presents an application of the boundary element method applied to a two-dimensional conductive heat transfer. The algorithm of the method is explained and its advantages are outlined. Green's function as a fundamental solution for Poisson's equation in two dimensions was used and the direct approach was applied. The presented results concern building construction elements as typical cases of thermal bridges. Some properties...

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• Implementation of continuum damage in elasto-viscoplastic constitutive equations

  Publikacja

  • A. Ambroziak
  • P. Kłosowski
  • M. Nowicki
  • R. Schmidt

  - TASK Quarterly - Rok 2006

  W pracy opisano podstawowy wariant modelu Chaboche, oraz założenia i implementacje kontynualnego modelu zniszczenia do komercyjnego programu MES. W pracy zaprazentowano dwa podejścia zobrazowane na przykładach obliczeń numerycznych.

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• Numerical investigation of flooding of real-topography developed areas following river embankment failure

  Publikacja

  • M. Szydłowski
  • B. Twaróg

  - TASK Quarterly - Rok 2006

  Przedstawiono numeryczne symulacje hydrodynamiki przepływu powodziowego na terenie zabudowanym po przerwaniu wału przeciwpowodziowego. Zaprezentowano porównanie obliczeń z wynikami własnych pomiarów laboratoryjnych przeprowadzonych w Laboratorium Hydrauliki Inżynierii Środowiska Politechniki Gdańskiej.Zaproponowano wykorzystanie modelu przepływu do oceny zagrożenia powodziowego obszarów zabudowanych zlokalizowanych na terenach...

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• Conditional simulation of spatiotemporal random fields of environmental contamination

  Publikacja

  • R. Jankowski
  • H. Walukiewicz

  - TASK Quarterly - Rok 2006

  Artykuł przedstawia metodę warunkowego modelowania przestrzenno-czasowych pól losowych w zagadnieniach środowiska naturalnego. Metoda ta może być wykorzystana do prognozy zanieczyszczenia w wybranych punktach w danym czasie na podstawie pomiarów wykonanych w innych miejscach i/lub w innym czasie. Analizę przeprowadzono na przykładzie zanieczyszczenia gruntu metalami ciężkimi.

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• FE analysis of strain localization in concrete in elasto-plasticity and damage mechanics with non-local softening

  Publikacja

  • J. Bobiński

  - TASK Quarterly - Rok 2006

  W artykule przedstawiono wyniki symulacji numerycznych zjawiska lokalizacji odkształceń w betonie wykonanaych przy zastosowaniu metody elementów skończonych (MES). Do opisu betonu wykorzystano dwa prawa materiałowe zdefiniowane w ramach teorii plastyczności (kryterium Druckera-Pragera w ściskaniu i warunek Rankine'a w rozciąganiu) oraz mechaniki uszkodzeń w sformułowaniu odkształceniowym. Dla poprawnego opisu lokalizacji (regularyzacji...

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• Length distribution of fuzzy-end segments

  Publikacja

  • S. Frigio
  • G. Cosimi
  • G. Bergmański
  • E. Urbańska-Galewska
  • J. Rybicki

  - TASK Quarterly - Rok 2006

  Obliczono analitycznie rozkłady gęstości prawdopodobieństwa dla długości odcinków o rozmytych końcach, tzn. takich, których końce mogą przyjmować losowe położenia, zgodnie z zadanym rozkładem prawdopodobieństwa. Rozważono przypadki jedno-, dwu- i trójwymiarowych obszarów, w których mogą znajdować się końce odcinków. Podano przykłady potencjalnych zastosowań uzyskanych wyników.

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• Application of the Murnaghan model in analysis of non-linear elastic material properties of pvc-coated fabric

  Publikacja

  • A. Ambroziak

  - TASK Quarterly - Rok 2006

  W pracy omówiono proces identyfikacji parametrów materiałowych dla wybranej tkaniny technicznej typu Panama. Zaproponowano metodę identyfikacji nieliniowo sprężystych właściwości tkaniny Panama dla modelu Murnaghan'a. Określono zakres stosowalności nieliniowo sprężystych parametrów, w oparciu o doraźną wytrzymałości tkaniny na rozciąganie, która poddana redukcji określa tzw. wytrzymałość długoterminową. Opisano doświadczenia niezbędne...

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• Geometrically nonlinear analysis of shells

  Publikacja

  • A. Ambroziak

  - TASK Quarterly - Rok 2006

  Artykuł porusza zagadnienia nieliniowej analizy powłok wykonanych z materiałów izotropowych. Obliczenia wykonano przy wykorzystaniu dwóch komercyjnych programów wykorzystujących Metodę Elementów Skończonych (Robot Millennium v. 19.0 i MSC.Marc v.2005r2 ). Główną uwagę skupiono na zjawisku zakleszczenia.

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• Membrane-hanging roof analysis: an example

  Publikacja

  • A. Ambroziak

  - TASK Quarterly - Rok 2006

  Artykuł przedstawia analizę konstrukcji membranowo cięgnowej poddanej obciążeniom klimatycznym. Analizowano wstępny wariant nowoprojektowanego przekrycia Opert Leśnej w Sopocie. Dyskutowane są również podstawowe równania modelu sieci gęstej wykorzystanego w opisie zachowania się tkaniy technicznej.

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• Survey of modern trends in analysis of continuum damage mechanics

  Publikacja

  • A. Ambroziak
  • P. Kłosowski

  - TASK Quarterly - Rok 2006

  W artykule dokonano szerokiego przegladu literatury z zakresu mechaniki zniszczenia izotropowego. Przedstawiono równania stosowane w opisie zniszczenia materiału.

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• GENERALISED HERSCHEL MODEL APPLIED TO BLOOD FLOW MODELLING

  Publikacja

  • K. Tesch

  - TASK Quarterly - Rok 2012

  This paper introduces a new rheological model of blood as a certain generalisation of the standard Herschel-Bulkley model. This model is a rheological constitutive equation and belongs to the group of the so-called generalised Newtonian fluids. Experimental data is compared with results, obtained from the new model, to demonstrate that it allows for the best agreement together with Luo-Kuang model. The new model may be easily implemented...

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• Variational Method of Finding Streamlines in Ring Cascades for Creeping Flows

  Publikacja

  • K. Tesch
  • M. Banaszek

  - TASK Quarterly - Rok 2011

  This paper presents a new, analytical method of finding streamlinesfor creeping flows inside a ring cascade which is composed of an infinite number of infinitely thin blades. An analytical solution has been obtained through minimisation of a dissipation functional by means of variational calculus method. The necessary condition for optimum of a functional gives the Stokes equation if some additional assumptions are introduced....

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• Elasto-viscoplastic properties of AA2017 aluminium alloy

  Publikacja

  • A. Ambroziak
  • P. Kłosowski
  • Ł. Pyrzowski

  - TASK Quarterly - Rok 2011

  Artykuł opisuje procedurę identyfikacji parmetrów materiałowych dla sprężysto-lepkoplastycznego modelu Bodnera-Partoma. Prezentowane są symulacje numeryczne testów jednoosiowego rozciągania z różnymi prędkościmi odkształcenia, które porównane są z wynikami eksperymantalnymi.

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• Numerical modeling of ice jam formation in the Włocławek reservoir

  Publikacja

  • T. Kolerski

  - TASK Quarterly - Rok 2011

  Artykuł opisuje zjawisko powstawania zatoru lodowego w zbiorniku przepływowym przy użyciu dwuwymiarowego modelu DynaRICE. Analizowany proces został przeanalizowany na przykładzie zatoru lodowego, który utworzył się na zbiorniku Włocławek w syczniu 1982 roku. Przeprowadzone obliczenia pokazały, że zator utworzyła się z lodu powierzchniowego. Efekt termiczny i tworzenie się śryżu w zbiorniku został pominięty jako drugorzędny. Wyniki...

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• Space-Time Conservation Method applied to numerical solution of water hammer equations

  Publikacja

  • K. Weinerowska-Bords

  - TASK Quarterly - Rok 2011

  Artykuł poświęcony jest metodzie czasoprzestrzennych objętości skończonych (STC) zastosowanej do przypadku uderzenia hydraulicznego w stalowym przewodzie pracującym pod ciśnieniem. Metoda STC ze względu na swoje własności numeryczne - m.in. wysoką dokładność - może być interesującą alternatywą dla tradycyjnych metod numerycznych, szczególnie w przypadku, gdy efekty numeryczne mają bardzo silny wpływ na rozwiązanie, tym samym utrudniając...

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• Application of Monte-Carlo method to modelling influence of selected soil heterogeneity on macrodispersion of pollutants in unsaturated soil medium

  Publikacja

  • W. Gorczewska-Langner

  - TASK Quarterly - Rok 2011

  The influence of soil heterogeneity on miscible solute transport in soil is analyzed. The transport process is simulated numerically using the Monte-Carlo method. This paper shows how different types of soil heterogeneity influence the process of contaminant spreading. If independent flow paths exist in the soil, the degree of the mixing of pollutants in the outflow from the soil profile is larger. If the preferential flow paths...

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• Solution of the dike-break problem using finite volume method and splitting technique

  Publikacja

  • D. Gąsiorowski

  - TASK Quarterly - Rok 2011

  In the paper the finite volume method (FVM) is presented for the solution of two-dimensional shallow water equations. These equations are frequently used to simulate the dam-break and dike-break induced flows. The applied numerical algorithm of FVM is based on the wave-propagation algorithm which ensures a stable solution and simultaneously minimizes the numerical errors. The dimensional decomposition according to the coordinate...

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• Numerical Simulation of Open Channel Flow between Bridge Piers

  Publikacja

  • M. Szydłowski

  - TASK Quarterly - Rok 2011

  Przedstawiono dwuwymiarowy model przepływu wody płytkiej, który wykorzystano do symulacji przepływu wody w kanale otwartym w rejonie przekroju mostowego. Równania przepływu rozwiązano metodą objętości skończonych. Wyniki symulacji ruchu wody pomiędzy filarami mostowymi porównano z pomiarami laboratoryjnymi przeprowadzonymi w Laboratorium Hydrauliki i Inżynierii Środowiska politechniki Gdańskiej. Zgodność uzyskanych wyników obliczeń...

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• Simulation of Residence Time Distribution and Mixing in Reactors with Recirculation Using 2D Approach

  Publikacja

  • P. Zima

  - TASK Quarterly - Rok 2011

  In this paper, we propose a 2D approach in order to create a mathematical model for the determination of the residence time distribution for a flow reactor with recirculation. Apart from characterizing the functional residence time distribution, this model can help improve the operation of the reactor at the design stage. The mathematical model was validated by comparison with experiments carried out in a hydraulic laboratory.

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• Numerical analysis of open channel steady gradually varied flow using the simplified saint-venant equations

  Publikacja

  • W. Artichowicz

  - TASK Quarterly - Rok 2011

  For one-dimensional open-channel flow modeling, the energy equation is usually used. There exist numerous approaches using the energy equation for open-channel flow computations, which resulted in the development of several very efficient methods for solving this problem applied to channel networks. However, the dynamic equation can be used for this purpose as well. This paper introduces a method for solving a system of non-linear...

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• Unstructured finite-volume meshes for two-dimensional flow in variably saturated porous media

  Publikacja

  • K. Burzyński
  • A. Szymkiewicz

  - TASK Quarterly - Rok 2011

  W pracy opisano rozwiązanie równania przepływu nienasyconego w ośrodkach porowatych z wykorzystaniem metody objętości skończonych. Przedstawiono różne sposoby tworzenia siatki numerycznej. Przeprowadzono analizę wpływu sposobu uśredniania współczynnika filtracji między sąsiednimi objętościami skończonymi na dokładność wyników.

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• Distorsional analysis of I-section beam

  Publikacja

  • M. Kujawa

  - TASK Quarterly - Rok 2012

  An elastic stiffness matrix was derived in the case of distortion of a restrained thin-walled I-section beam using the minimum total stationary elastic energy condition. The function describing the angle of distortion was adopted form the solution of differential equation in the case of restrained distortion. The example presented in the paper helps to assess the correctness of the proposed solution. The proposed elastic stiffness...

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• A Parallel Genetic Algorithm for Creating Virtual Portraits of Historical Figures

  Publikacja

  • H. Krawczyk
  • J. Proficz
  • T. Ziółkowski

  - TASK Quarterly - Rok 2012

  In this paper we present a genetic algorithm (GA) for creating hypothetical virtual portraits of historical figures and other individuals whose facial appearance is unknown. Our algorithm uses existing portraits of random people from specific historical period and social background to evolve a set of face images potentially resembling the person whose image is to be found. We then use portraits of the person's relatives to judge...

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• Torsion of restrained thin-walled bars of open constant bisymmetric cross-section

  Publikacja

  • M. Kujawa

  - TASK Quarterly - Rok 2012

  Elastic and geometric stiffness matrices were derived using Castigliano's first theorem, for the case of torsion of restrained thin-walled bars of open constant bisymmetric cross-section. Functions which describe the angles of torsion were adopted from the solutions of thedifferential equation for restrained torsion. The exact solutions were simplified by expanding them in a power series. Numerical examples were taken from Kujawa...

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• Orthotropic membrane as a mechanical model of surgical implant in abdominal hernia repair

  Publikacja

  • I. Lubowiecka

  - TASK Quarterly - Rok 2012

  Even though the incisional hernia repair surgery is a well known procedure, mechanical properties of the tissue-implant system are unknown so the implantation of the repairing mesh is quite intuitive and, recurrences of the illness still take place. The main objective of the study is to define an operated hernia model that can be used for surgery planning and the assessment of the repair persistence. The load applied to the structure...

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• Numerical simulation of transient flow in storm sewers using standard and improved mccormack scheme

  Publikacja

  • M. Szydłowski
  • J. Machalińska-Murawska

  - TASK Quarterly - Rok 2012

  Problem przepływu wody w rurach kanalizacji deszczowej wiąże się z pewnymi specyficznymi zjawiskami zachodzącymi w przewodach podczas zjawisk burzowych. Jeśli rury zaczynają być całkowicie wypełnione wodą, można zaobserwować przejście z ruchu ze swobodną powierzchnią do ruchu pod ciśnieniem i odwrotnie. Takie zjawisko można zaobserwować również w kanałach kontrolowanych przez urządzenia sterujące, np. zasuwy. Ponadto ruch szybkozmienny...

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• Nanomechanical Properties of Metallic fcc Nanorods from Molecular Simulations with the Sutton-Chen Potential

  Publikacja

  • M. Białoskórski
  • J. Rybicki

  - TASK Quarterly - Rok 2012

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• 1D Model Callibration on the Basis on 3D calculations for Tesla Turbine

  Publikacja

  • R. Puzyrewski
  • K. Tesch

  - TASK Quarterly - Rok 2010

  The paper presents the system of equations for axisymmetriclaminar flow, after averaging, through the width of interdisk slit ofTesla turbine. Coefficients were introduced, as a result ofaveraging, that improve the efficiency of 1D model. The minimalnumber of such coefficients was determined. The 1D modelmakes it possible to attain analytical solutions to an accuracylimited by these coefficients. Calibration of 1D model depends...

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• Example of tension fabric structure analysis

  Publikacja

  • A. Ambroziak
  • P. Kłosowski

  - TASK Quarterly - Rok 2010

  The aim of the work is to examine two variants of non-linear strain-stress relations accepted to description of architectural fabric. Discussion on the fundamental equations of the dense net model, used in description of coated woven fabric behaviour is presented. An analysis of tensile fabric structures subjected to the dead load and initial pretension is described.

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• Rotor Blade Geometry Optimisation in Kaplan Turbine

  Publikacja

  • M. Banaszek
  • K. Tesch

  - TASK Quarterly - Rok 2010

  The paper presents the description of method and results of rotor blade shape optimisation. The rotor blading constitutes a part ofturbine flow path. Optimisation consists in selection of the shape that minimises ratio of polytrophic loss. Shape of the blade isdefined by the mean camber line and thickness of the airfoil. Thickness is distributed around the camber line based on the ratio ofdistribution. Global optimisation was done...

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• On some extensions of Murray's Law

  Publikacja

  • K. Tesch

  - TASK Quarterly - Rok 2010

  This paper cites the original Murray's law about optimal radii.Extensions to some class of non-newtonian flows that aredescribedby Ostwalda-de Waele model and newtonian flows foreliptical crosssections. A generalisation of Murray's law formultiobjectiveformulation is also given. It is shown that theoriginal formulation of optimal condition is a particular case ofmultiobjective formulation.

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• Molecular dynamics simulations of ultraprecision machining of fcc monocrystals

  Publikacja

  • M. Rychcik-Leyk
  • M. Białoskórski
  • J. Dziedzic
  • J. Rybicki

  - TASK Quarterly - Rok 2010

  Artykuł zawiera wyniki wielkoskalowych symulacji dynamiczno-molekularnych ultraprecyzyjnego skrawania monokryształów metali niedeformowalnym narzędziem. Zmiennymi parametrami symulacji były: szybkość i głębokość skrawania, temperatura, orientacja krystalograficzna skrawanego kryształu oraz kształt narzędzia.Analizie poddano zmiany strukturalne w obrabianym materiale.

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• Analysis of Excavation-induced Deformation with Different Soil Models

  Publikacja

  • M. Cudny
  • P. Popielski

  - TASK Quarterly - Rok 2010

  Monitorowany wykop budowlany w centrum Warszawy poddano symulacjom numerycznym z wykorzystaniem metody elementów skończonych. Wykop zrealizowany został w pre-konsolidowanych utworach spoistych z zastosowaniem ścian szczelinowych i metody stropowej. Szczególnie ważny w symulacjach tego rodzaju zagadnień jest wybór modelu zachowania się gruntu w warunkach małych odkształceń przed osiągnięciem zniszczenia. Opis aktualnej sztywności...

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• Voice command recognition using hybrid genetic algorithm

  Publikacja

  • M. Wroniszewska
  • J. Dziedzic

  - TASK Quarterly - Rok 2010

  Abstract: Speech recognition is a process of converting the acoustic signal into a set of words, whereas voice command recognition consists in the correct identification of voice commands, usually single words. Voice command recognition systems are widely used in the military, control systems, electronic devices, such as cellular phones, or by people with disabilities (e.g., for controlling a wheelchair or operating a computer...

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• Determining the viscoplastic parameters of rubber-toughened plastics

  Publikacja

  • A. Ambroziak
  • P. Kłosowski

  - TASK Quarterly - Rok 2008

  W artykule omówiono szczegółowo zastosowanie sprężysto-lepkoplastycznego prawa Bodnera-Partoma do opisu zachowania się tworzywa sztucznego (kopolimer etylenowo-propylenowy). Parametry materiałowe ustalono na podstawie jednoosiowych testów jednoosiowego rozciągania. Proponowane podejście jest zilustrowane przykładami obliczeniowymi w programie MSC.Marc z wykorzystaniem procedury UVSCPL.

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• Model angular distribution functions in CA3, CA4 and CA6 structural units of glassy systems

  Publikacja

  • G. Bergmański
  • S. Feliziani
  • J. Rybicki

  - TASK Quarterly - Rok 2007

  Metodą Monte Carlo wyliczono funkcje rozkładu kątów pomiędzykrawędziami w losowo deformowanych jednostkach strukturalnychCA_3, CA_4 i CA_6, gdzie C oznacza centralny kation,a A - wierzchołkowy anion. Uzyskane dane mogą być wykorzystanejako dane referencyjne do ilościowej oceny stopnia nieporządkuw materiałach symulowanych numerycznie, głównie szkłachtlenkowych. W pracy podano przykłady takiego zastosowania.

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• Accuracy and parameter estimation of elastic and viscoelastic models of water hammer

  Publikacja

  • K. Weinerowska-Bords

  - TASK Quarterly - Rok 2007

  W artykule analizowany jest zagadnienie uderzenia hydraulicznego, stanowiące jeden z najważniejszych problemów nieustalonego przepływu w przewodach pod ciśnieniem. Mimo ponad stuletnich doświadczeń w badaniach zagadnienie to jest ciągle nie w pełni rozpoznane. Może być onio rozpatrywane na dwóch płaszczyznach - praktycznej i teoretycznej. W obu przypadkach na etapie rozwiązania powstają problemy sprawiające, że wyniki nie są satysfakcjonujące....

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• Free surface flow modeling in numerical estimation of flood risk zones: a case study

  Publikacja

  • M. Szydłowski
  • A. Magnuszewski

  - TASK Quarterly - Rok 2007

  Na przykładzie doliny Wisły w Warszawie przedstawiono metodę wyznaczenia stref zagrożenia powodziowego. Symulowana numerycznie powódź wywołana została potencjalnym przerwaniem obwałowania rzeki w okolicach Saskiej Kępy. Do obliczeń zastosowano opracowany w Katedrze Hydrotechniki Wydziału Inżynierii Lądowej i Środowiska Politechniki Gdańskiej model dwuwymiarowego, płaskiego przepływu wody ze swobodną powierzchnią.

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• Simulation of water flow in double -porosity soils on unstructured grids with the finite element method.

  Publikacja

  • K. Burzyński
  • A. Szymkiewicz

  - TASK Quarterly - Rok 2007

  Rozważa sie model przepływu wody w gruntowym ośrodku o podwójnej porowatości. Model matematyczny uzyskano poprzez zastosowanie teorii homogenizacji zastosowanej do gruntów o bardzo dużej różnicy przepuszczalności.

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• The CFD modeling in bioreactor tracer studies

  Publikacja

  • P. Zima

  - TASK Quarterly - Rok 2007

  W artykule zaprezentowano badania traserowe w bioreaktorach z osadem czynnym. Przedstawiono efekty działania procesu dyspersji na podstawie obliczonych podłużnych profili koncentracji znacznika w komorach osadu czynnego zlokalizowanych na Oczyszczalni Ścieków "Wschód" w Gdańsku. W ramach badań wykonano symulację przepływu substancji nieaktywnej (bazując na pomierzonych profilach stężenia znacznika) stosując jednowymiarowe równanie...

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• Determination of selected parameters in a 1D open channel flow model

  Publikacja

  • K. Weinerowska-Bords

  - TASK Quarterly - Rok 2007

  Określenie parametrów jest ważnym etapem tworzenia modelu matematycznego. W przypadku jednowymiarowego modelu przepływu ze swobodną powierzchnią opisanego układem równań de Saint-Venanta, jedną z grup parametrów wymagających identyfikacji są parametry związane z tarciem. Mogą one być określone w różny sposób, ale w większości przypadków problem ten stanowi zagadnienie żle postawione. W takich przypadkach najczęściej stosowaną...

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• Two-dimensional vertical analysis of dam-break flow

  Publikacja

  • P. Zima

  - TASK Quarterly - Rok 2007

  W artykule przedstawiono matematyczne modelowanie przepływów ze swobodną powierzchnią w kanałach otwartych. Do symulacji przepływu użyto dwuwymiarowy pionowy model RANS. Wchodzące w skład modelu równania Naviera-Stokesa rozwiązano stosując algorytm SIMPLE dla metody różnic skończonych. Do śledzenia zmian swobodnego zwierciadła wody zastosowano metodę MAC. Analizie poddano szybkozmienny przepływ po poziomym, gładkim dnie wywołany...

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• Numerical simulation of the quaternary aquifer groundwater flow of the northern Vistula delta plain

  Publikacja

  • W. Szpakowski

  - TASK Quarterly - Rok 2007

  W pracy przedstawiono wyniki obliczeń krążenia wód podziemnych w czwartorzędowym poziomie wodonośnym rejonu Żuław Gdańskich. Czwartorzędowy poziom wodonośny odgrywa najważniejszą rolę w zaopatrzeniu w wodę aglomeracji gdańskiej. W obliczeniach wykorzystano programy Modflow i Modpath zawarte w pakiecie (GMS 3.1). Odtworzono warunki przed uruchomieniem ujecia Lipce wykorzystując obliczenia dla stanu ustalonego krążenia wody w warstwie...

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• Obtaining ionic forces by the total-energy tight-binding method

  Publikacja

  • J. Dziedzic

  - TASK Quarterly - Rok 2007

  Zastosowanie metody ciasnego wiązania w sformułowaniu nieortogonalnym do obliczania sił atomowych w symulacji metodą dynamiki molekularnej pozwala na stworzenie modelu charakteryzującego się lepszą przenośnością, w porównaniu z potencjałami empirycznymi, którymi posługuje się tradycyjna dynamika molekularna. W niniejszej pracy przedstawiono szczegółowo sposób obliczenia pochodnych elementów macierzy Hamiltona i macierzy nakładania...

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• A digital cartographic source for numerical models in hydrology

  Publikacja

  • W. Szpakowski
  • J. Szulwic

  - TASK Quarterly - Rok 2007

  Autorzy prowadzą analizę wykorzystania i przydatności cyfrowych danych kartograficznych w rozwiązywaniu przestrzennych zagadnień hydrologicznych. Szczególne znaczenie dla prowadzonych analiz mają DTM i DEM. Są one źródłem bezpośrednich wielkości wejściowych modelu hydrologicznego i dodatkowo pozwalają na szersze możliwości prezentacji otrzymanego rozwiązania.

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• Curves of thermodynamic states in some fluids with dispersion

  Publikacja

  • A. Perelomova

  - TASK Quarterly - Rok 2017

  variations in the thermodynamic state of a dispersive medium, caused by sound, are studied. A bubbly liquid and a Maxwell fluid are considered as examples. Curves in the plane of thermodynamic states are plotted. They are in fact pictorial images of linear relations of excess pressure and excess density in the acoustic wave which reflect irreversible attenuation of the sound energy. The curves account for the nonlinear generation...

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• Nonlinear phenomena of small-scale sound in a gas with exponential stratification

  Publikacja

  • A. Perelomova

  - TASK Quarterly - Rok 2017

  The nonlinear dynamics of perturbations, quickly varying in space, with comparatively large characteristic wavenumbers k: k>1/H, is considered. H is the scale of density and pressure reduction in unperturbed gas, as the coordinate (H is the so-called height of the uniform equilibrium gas). Coupling nonlinear equations which govern the sound and the entropy mode in a weakly nonlinear flow are derived. They describe the dynamics...

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• Fractional Problems with Right-Handed Riemann-Liouville Fractional Derivatives

  Publikacja

  • T. Jankowski

  - TASK Quarterly - Rok 2016

  In this paper, we investigate the existence of solutions for advanced fractional differential equations containing the right-handed Riemann-Liouville fractional derivative both with nonlinear boundary conditions and also with initial conditions given at the end point T of interval [0,T ]. We use both the method of successive approximations, the Banach fixed point theorem and the monotone iterative technique, as well. Linear problems...

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• Multiple Solutions to Third-Order Differential Equations with Derivative Dependence and Deviating Arguments

  Publikacja

  • T. Jankowski

  - TASK Quarterly - Rok 2016

  In this paper, we give some new results for multiplicity of positive (nonnegative) solutions for third-order differential equations with derivative dependence, deviating arguments and Stieltjes integral boundary conditions. We discuss our problem with advanced argument α and arbitrary β ∈ C([0,1],[0,1]), see problem (2). It means that argument β can change the character on [0,1], so β can be delayed in some set J ⊂ [0,1] and advanced...

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• Successive Iterative Method for Higher-Order Fractional Differential Equations Involving Stieltjes Integral Boundary Conditions

  Publikacja

  • T. Jankowski

  - TASK Quarterly - Rok 2016

  In this paper, the existence of positive solutions to fractional differential equations with delayed arguments and Stieltjes integral boundary conditions is discussed. The convergence of successive iterative method of solving such problems is investigated. This allows us to improve some recent works. Some numerical examples illustrate the results.

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• Calculation methods of interaction of electromagnetic waves with objects of complex geometries

  Publikacja

  • M. Shopa

  - TASK Quarterly - Rok 2016

  Modeling of the electromagnetic interaction with different homogeneous or inhomo-geneous objects is a fundamental and important problem. It is relatively easy to solve Maxwellequations analytically when the scattering object is spherical or cylindrical, for example. How-ever, when it loses these properties all that is left for us is to useapproximation models, to ac-quire the solution we need. Modeling of complex, non-spherical,...

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• Qualitative evaluation of distributed clinical systems supporting research teams working on large-scale data

  Publikacja

  • T. Dziubich

  - TASK Quarterly - Rok 2017

  Inthispaper,fivecontemporaryscalablesystemstosupportmedicalresearchteams are presented. Their functionalities extend from heterogeneous unstructured data acquisition through large-scale data storing, to on-the-fly analyzing by using robust methods. Such kinds of systems can be useful in the development of new medical procedures and recommendation rules for decision support systems. A short description of each of them is provided....

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• GENERAL DYNAMIC PROJECTING OF MAXWELL EQUATIONS

  Publikacja

  • P. Wojda
  • S. Leble

  - TASK Quarterly - Rok 2017

  A complete – system of Maxwell equations is splitting into independent subsystems by means of a special dynamic projecting technique. The technique relies upon a direct link between field components that determine correspondent subspaces. The explicit form of links and corresponding subspace evolution equations are obtained in conditions of certain symmetry, it is illustrated by examples of spherical and quasi-one-dimensional waves.

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• CENTRAL-FORCE DECOMPOSITION OF THE TERSOFF POTENTIAL

  Publikacja

  • T. H. Tran
  • S. Winczewski

  - TASK Quarterly - Rok 2017

  Central forces play important role in the analysis of results obtained with particle simulation methods, since they allow evaluating stress fields. In this work we derive expressions for a central-force decompositon of the Tersoff potential, which is often used to describe interatomic interactions in covalently bonded materials. We simplify the obtained expressions and discuss their properties.

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• A SHORT REVIEW OF BLOOD FLOW MODELLING METHODS: FROM MACRO- TO MICROSCALES

  Publikacja

  • K. Kaczorowska-Ditrich
  • K. Tesch

  - TASK Quarterly - Rok 2017

  The aim of this paper it to review various scale approaches to the blood flow modelling. Blood motion may be described by three types of mathematical models according to the observed scales or resolutions, namely microscopic, mesoscopic and macroscopic descriptions. The above approaches are discussed together with their advantages and disadvantages. Several results of mesoscopic simulations are presented with particular attention...

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• Multidisciplinary Open System Transferring Knowledge for R2B Development

  Publikacja

  • H. Krawczyk
  • P. Lubomski

  - TASK Quarterly - Rok 2017

  Despite many efforts, there is still a serious problem in transferring knowledge from research to business. The problem is especially visible in Poland – the cooperation of R2B is ineffective. We are trying to solve this problem using some IT support. The manuscript presents some solutions developed at the Gdańsk University of Technology. In particular, the platform called “MOST Knowledge” is deeply described. Its layer architecture,...

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• Open extensive IoT research and measurement infrastructure for remote collection and automatic analysis of environmental data.

  Publikacja

  • Ł. Wiszniewski
  • D. Klimowicz

  - TASK Quarterly - Rok 2017

  Internet of Things devices that send small amounts of data do not need high bit rates as it is the range that is more crucial for them. The use of popular, unlicensed 2.4 GHz and 5 GHz bands is fairly legally enforced (transmission power above power limits cannot be increased). In addition, waves of this length are very diffiult to propagate under field conditions (e.g. in urban areas). The market response to these needs are the...

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• INFORMATION SOCIETY DEVELOPMENT TRENDS, FROM DATA THROUGH KNOWLEDGE TO WISDOM

  Publikacja

  • H. Krawczyk
  • A. Targowski

  - TASK Quarterly - Rok 2017

  The paper investigates both the causes and effects of the rapid increase in the data volume(BigData)andtheirimpactonhumancognition.TheroleoftheInternetindistributing and exchanging of such data, and their impact on the growth of the Information Society are emphasized. As a result, Wisdom Science – a new kind of research – emerges which has the potential to facilitate more advanced solutions in the digital world. In consequence,...

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• JMATRIX - a package for relativistic J-matrix calculations in elastic scattering of electrons from model potentials

  Publikacja

  • P. Syty
  • J. E. Sienkiewicz

  - TASK Quarterly - Rok 2017

  We present a software package JMATRIX, consisting of two computer codes written in FORTRAN 95 and parallelized with OpenMP, implementing the so-called J-matrix method, applied to elastic scattering of electrons on the radial potential, vanishing faster than Coulomb one. In the J-matrix method, physical scattering problem is replaced by using well-defined model, which is solved analytically. Presented software implements both non-relativistic...

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• Complementary oriented allocation algorithm for cloud computing

  Publikacja

  • P. Orzechowski

  - TASK Quarterly - Rok 2017

  Nowadays cloud computing is one of the most popular processing models. More and more different kinds of workloads have been migrated to clouds. This trend obliges the community to design algorithms which could optimize the usage of cloud resources and be more effiient and effective. The paper proposes a new model of workload allocation which bases on the complementarity relation and analyzes it. An example of a case of use is shown...

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• The Bridge to Knowledge – Open Access to Scientific Research Results on Multidisciplinary Open System Transferring Knowledge Platform

  Publikacja

  • A. Wałek
  • P. Lubomski

  - TASK Quarterly - Rok 2017

  The European policy of Open Access to scientific research is now one of the key issues discussed in public debates on the future development of scientific communication. The implementation of Open Access tools has significant impact on scientific and economic growth. On the one hand, Open Access accelerates disseminating new research findings and facilitates recognition of authors on a more global scale. On the other hand, Open...

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• COMPARATIVE STUDY OF TRADITIONAL AND VIRTUAL TEAMS

  Publikacja

  • B. Krawczyk-Bryłka

  - TASK Quarterly - Rok 2017

  The paper presents two kinds of cooperating teams: traditional and virtual, and proposes a new measure of the team virtuality level. Some representative teamwork characteristics, such as team member competencies, team diversity, leadership, and team decision-making are analyzed and compared depending on the degree of virtuality. Moreover, the team climate as one of the team performance measures is also analyzed and compared in...

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• DATABASE AND BIGDATA PROCESSING SYSTEM FOR ANALYSIS OF AIS MESSAGES IN THE NETBALTIC RESEARCH PROJECT

  Publikacja

  • M. Lewczuk
  • P. Cichocki
  • J. Woźniak

  - TASK Quarterly - Rok 2017

  A specialized database and a software tool for graphical and numerical presentation of maritime measurement results has been designed and implemented as part of the research conducted under the netBaltic project (Internet over the Baltic Sea – the implementation of a multi-system, self-organizing broadband communications network over the sea for enhancing navigation safety through the development of e-navigation services.) The...

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• Processing of Satellite Data in the Cloud

  Publikacja

  • J. Proficz
  • K. Drypczewski

  - TASK Quarterly - Rok 2017

  The dynamic development of digital technologies, especially those dedicated to devices generating large data streams, such as all kinds of measurement equipment (temperature and humidity sensors, cameras, radio-telescopes and satellites – Internet of Things) enables more in-depth analysis of the surrounding reality, including better understanding of various natural phenomenon, starting from atomic level reactions, through macroscopic...

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• MAGNETOACOUSTIC HEATING AND STREAMING IN A PLASMA WITH FINITE ELECTRICAL CONDUCTIVITY

  Publikacja

  • A. Perelomova

  - TASK Quarterly - Rok 2019

  Nonlinear effects of planar and quasi-planar magnetosound perturbations are discussed. Plasma is assumed to be an ideal gas with a finite electrical conductivity permeated by a magnetic filed orthogonal to the trajectories of gas particles. the excitation of non-wave modes in the filed of intense magnetoacoustic perturbations, i.e., magnetoaciustic heating and streaming, is discussed. The analysis includes a derivation if instantaneous...

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• NUMERICAL ANALYSIS OF SPECIES DIFFUSION AND METHANOL DECOMPOSITION IN THERMOCATALYTIC REACTOR BASED ON THE INTERMETALLIC PHASE OF Ni3Al FOR LOW REYNOLDS NUMBERS

  Publikacja

  • P. Ziółkowski
  • M. Stajnke
  • P. Jóźwik
  • Z. Bojar
  • P. Ziółkowski
  • B. Janusz

  - TASK Quarterly - Rok 2018

  Numerical modelling of hydrogen production by means of methanol decomposition in a thermocatalytic reactor using corrugated foil made of the Ni3Al intermetallic phase is shown in the paper. Experimental results of the flow analysis of mixtures containing helium and methanol in a thermocatalytic reactor with microchannels were used for the initial calibration of the CFD calculations (calculations based on the Computational Fluid...

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• BIG PROBLEMS WITH BIG DATA

  Publikacja

  • K. Goczyła

  - TASK Quarterly - Rok 2020

  The article presents an overview of the most important issues related to the phenomenon called big data. The characteristics of big data concerning the data itself and the data sources are presented. Then, the big data life cycle concept is formulated. The next sections focus on two big data technologies: MapReduce for big data processing and NoSQL databases for big data storage.

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• Bridge of Knowledge: an Internet platform for R2R and R2B transfer of knowledge and promotion of cooperation

  Publikacja

  • H. Krawczyk
  • P. Lubomski

  - TASK Quarterly - Rok 2020

  Currently, the European Commission puts emphasis on supporting collaboration between universities and business. There are many possible ways to create a strong relationship between both these parties. Positive results of such cooperation lead to increased competitiveness of the global market and, in consequence, bring significant growth of innovation. The cooperation between research-to-research (R2R) and research-to-business (R2B)...

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• SERVICE-ORIENTED CYBERSPACE FOR IMPROVING CYBERSECURITY

  Publikacja

  • H. Krawczyk

  - TASK Quarterly - Rok 2020

  The paper presents a cyberspace model where different categories of IT services are offered and used largely. A general cybersecurity policy is considered and the corresponding cybersecurity strategies are shown. The role of such technologies as: Internet of Things, Cloud Computing and Big Data is analyzed in order to improve the cybersecurity of a cyberspace. A new kind of service oriented cyberspace is proposed and its main properties...

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• DATA JOURNALS AND DATA PAPERS IN VARIOUS RESEARCH AREAS AND SCIENTIFIC DISCIPLINES – BIBLIOMETRIC ANALYSIS BASED ON INCITES

  Publikacja

  • B. Adamczak

  - TASK Quarterly - Rok 2021

  The main aim of this work is to provide insight into a bibliometric analysis of Data Journals and Data Papers in terms of research areas, disciplines, publication year and country. In particular, we calculated many bibliometric indicators, especially: the number of publications and citations. Furthermore, this work also investigated the top 20 journals in which scientists published the largest number of Data Papers. It was found...

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• SMART SHOP SERVICES FOR BUILDING CUSTOMER-ORIENTED SCENARIOS

  Publikacja

  • H. Krawczyk
  • A. Sobecki

  - TASK Quarterly - Rok 2020

  The shops of today mostly support the customer by offering him or her products based on basic relationships between products viewed or ordered by users with similar tastes. This common approach may fail in many cases especially when the user does not have sufficient knowledge about the market, or when he or she wants to build a set of products in more than one shop. New categories of smart shop services are proposed in order to...

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• TASK CLOUD INFRASTRUCTURE IN THE CENTRE OF INFORMATICS – TRICITY ACADEMIC SUPERCOMPUTER & NETWORK

  Publikacja

  • P. Orzechowski

  - TASK Quarterly - Rok 2018

  The cloud solution called the TASK cloud is described. Its main components and the way of their implementation are described. Examples of deployed environments based on the cloud are also presented. Moreover, the idea of combining the cloud and big data platforms is suggested and discussed.

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• Influence of addition of carbon nanotubes on rheological properties of selected liquid lubricants - a computer simulation study

  Publikacja

  • A. Chopra
  • S. Winczewski

  - TASK Quarterly - Rok 2020

  This work is motivated by the improvement of anti-friction properties of lubricants by addition of CNTs proved experimentally in literature. In particular, a methodology is developed to compute the shear viscosity of liquid lubricants (Propylene Glycol) based on Molecular Dynamics simulation. Non-Equilibrium molecular dynamics (NEMD) approach is used with a reactive force field ReaxFF implemented in LAMMPS. The simulations are...

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• Some Security Features of Selected IoT Platforms

  Publikacja

  • R. Kałaska
  • P. Czarnul

  - TASK Quarterly - Rok 2020

  IoT (Internet of Things) is certainly one of the leading current and future trends for processing in the current distributed world. It is changing our life and society. IoT allows new ubiquitous applications and processing, but, on the other hand, it introduces potentially serious security threats. Nowadays researchers in IoT areas should, without a doubt, consider and focus on security aspects. This paper is aimed at a high-level...

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• Application of the neural networks for developing new parametrization of the Tersoff potential for carbon

  Publikacja

  • A. C. Nwachukwu
  • S. Winczewski

  - TASK Quarterly - Rok 2020

  Penta-graphene (PG) is a 2D carbon allotrope composed of a layer of pentagons having sp2- and sp3-bonded carbon atoms. A study carried out in 2018 has shown that the parameterization of the Tersoff potential proposed in 2005 by Ehrhart and Able (T05 potential) performs better than other potentials available for carbon, being able to reproduce structural and mechanical properties of the PG. In this work, we tried to improve the...

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• Molecular Dynamics simulations of thermal conductivity of penta-graphene

  Publikacja

  • I. I. Muna
  • S. Winczewski

  - TASK Quarterly - Rok 2020

  The thermal conductivity of penta-graphene (PG), a new two dimensional carbon allotrope and its dependence on temperature, strain, and direction are studied in this paper. The thermal conductivity of PG is investigated using a non-equilibrium molecular dynamics simulation (NEMD) with the Two Region Method by applying the optimized Tersoff interatomic potential. Our study shows that the thermal conductivity of PG (determined for...

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• Software for calculation of noise maps implemented on the supercomputer

  Publikacja

  • A. Czyżewski
  • M. Szczodrak

  - TASK Quarterly - Rok 2009

  This paper presents investigation results relevant to the implementation of the algorithms for the calculation of noise maps. The aim of the implementation of the algorithms on the computer cluster is explained. Selected implementation details of the software called the noise propagation model are described. The interaction of the software with the data acquisition system is presented. Noise maps obtained by exploitation of the...

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• Balance errors in numerical solutions of shallow water equations

  Publikacja

  • D. Gąsiorowski

  - TASK Quarterly - Rok 2007

  The analysis of the conservative properties of the shallow water equations is presented in the paper. The work focuses on the consistency of numerical solution of these equations with the conservation laws of mass and momentum. The investigations involve two different conservative forms which are solved by an implicit box scheme. The theoretical analysis supported by numerical experiments is carried out for rectangular channel...

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• NON-STATIONARY THERMAL SELF-ACTION OF ACOUSTIC BEAMS CONTAINING SHOCK FRONTS IN THERMOCONDUCTING FLUID

  Publikacja

  • A. Perelomova

  - TASK Quarterly - Rok 2016

  Non-stationary thermal self-action of a periodic or impulse acoustic beam containing shock fronts in a thermoconducting Newtonian fluid is studied. Self-focusing of a saw-tooth periodic and impulse sound is considered, as well as that of a solitary shock wave which propagates with the linear sound speed. The governing equations of the beam radius are derived. Numerical simulations reveal that the thermal conductivity weakens the...

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• A high-accuracy method of computation of x-ray waves propagation through an optical system consisting of many lenses

  Publikacja

  • S. Kshevetskii
  • P. Wojda

  - TASK Quarterly - Rok 2016

  The propagation of X-ray waves through an optical system consisting of many X-ray refractive lenses is considered. Two differential equations are contemplated for solving the problem for electromagnetic wave propagation: first – an equation for the electric field, second – an equation derived for a complex phase of an electric field. Both equations are solved by the use of a finite-difference method. The simulation error is estimated...

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• Suitability of LoRaWAN Technology for the Development of Maritime Applications

  Publikacja

  • Ł. Wiszniewski

  - TASK Quarterly - Rok 2018

  The LoRaWAN Technology opens new possibilities for gathering and analysis of distributed data. In the paper we concentrate on its maritime usability which was tested by us in the period from June to August 2018. Measurements of the LoRaWAN network coverage in the Bay of Gdansk area were carried out. Various conditions and places were tested. The research was planned in such a way as to gradually increase the range and control the...

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• Mashup Approaches for Improving Service Oriented Business Scenarios

  Publikacja

  • H. Krawczyk
  • N. Parsamyan

  - TASK Quarterly - Rok 2018

  Two kinds of business scenarios are considered: application- and service-oriented. It is shown that the former are more flexible and easier reconfigurable for both traditional (human-oriented) and IT services. Moreover, complex IT services can be created by simple IT services using the modern mashup technology. It is the reason why such business scenarios can be modeled by BPMN in much easier ways. A simple example of a supply...

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