Wyniki wyszukiwania dla: GAS

• Balance error generated by numerical diffusion in the solution of Muskingum equation

  Publikacja

  • D. Gąsiorowski

  - Rok 2009

  In the paper the conservative properties of the lumped hydrological models with variable parameters are discussed. It is shown that in the case of the non-linear Muskingum equation the mass balance is not satisfied. The study indicates that the mass balance errors are caused by the improper form of equation and by the numerical diffusion which is generated in the solution. It has been shown that the classical way of derivation...

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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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• Flood Routing by the Non-Linear Muskingum Model: Conservation of Mass and Momentum

  Publikacja

  • D. Gąsiorowski

  - Archives of Hydro-Engineering and Environmental Mechanics - Rok 2009

  In this paper, the conservative properties of the Muskingum equation, commonly applied to solve river flood routing, are analysed. The aim of this analysis is to explain the causes ofthe mass balance error, which is observed in the numerical solutions of its non-linear form. The linear Muskingum model has been considered as a semi-discrete form of the kinematic wave equation and therefore it was possible to derive its two non-linear...

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• Impact of the Finite Element Mesh Structure on the Solution Accuracy of a Two-Dimensional Kinematic Wave Equation

  Publikacja

  • D. Gąsiorowski

  - Water - Rok 2022

  The paper presents the influence of the finite element mesh structure on the accuracy of the numerical solution of a two-dimensional linear kinematic wave equation. This equation was solved using a two-level scheme for time integration and a modified finite element method with triangular elements for space discretization. The accuracy analysis of the applied scheme was performed using a modified equation method for three different...

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• Modelling of FloodWave Propagation with Wet-dry Front by One-dimensional Diffusive Wave Equation

  Publikacja

  • D. Gąsiorowski

  - Archives of Hydro-Engineering and Environmental Mechanics - Rok 2014

  A full dynamic model in the form of the shallow water equations (SWE) is often useful for reproducing the unsteady flow in open channels, as well as over a floodplain. However, most of the numerical algorithms applied to the solution of the SWE fail when flood wave propagation over an initially dry area is simulated. The main problems are related to the very small or negative values of water depths occurring in the vicinity of...

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• Balance errors generated by numerical diffusion in the solution of non-linear open channel flow equations

  Publikacja

  • D. Gąsiorowski

  - JOURNAL OF HYDROLOGY - Rok 2013

  The paper concerns the untypical aspect of application of the dissipative numerical methods to solve nonlinear hyperbolic partial differential equations used in open channel hydraulics. It is shown that in some cases the numerical diffusion generated by the applied method of solution produces not only inaccurate solution but as well as a balance error. This error may occur even for an equation written in the conservative form not...

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• Analysis of Floodplain Inundation Using 2D Nonlinear Diffusive Wave Equation Solved with Splitting Technique

  Publikacja

  • D. Gąsiorowski

  - Acta Geophysica - Rok 2013

  In the paper a solution of two-dimensional (2D) nonlinear diffusive wave equation in a partially dry and wet domain is considered. The splitting technique which allows to reduce 2D problem into the sequence of one-dimensional (1D) problems is applied. The obtained 1D equations with regard to x and y are spatially discretized using the modified finite element method with the linear shape functions. The applied modification referring...

• Discussion of “Development of an Accurate Time integration Technique for the Assessment of Q-Based versus h-Based Formulations of the Diffusion Wave Equation for Flow Routing” by K. Hasanvand, M.R. Hashemi and M.J. Abedini

  Publikacja

  • D. Gąsiorowski

  - JOURNAL OF HYDRAULIC ENGINEERING-ASCE - Rok 2015

  The discusser read the original with great interest. It seems, however, that some aspects of the original paper need additional comments. The authors of the original paper discuss the accuracy of a numerical solution of the diffusion wave equation formulated with respect to different state variables. The analysis focuses on nonlinear equations in the form of a single transport equation with the discharge Q (volumetric flow rate)...

• 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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• 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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• Case Reports in Gastrointestinal Medicine

  Czasopisma

  ISSN: 2090-6528 , eISSN: 2090-6536

• World Journal of Gastrointestinal Endoscopy

  Czasopisma

  ISSN: 1948-5190

• World Journal of Gastrointestinal Surgery

  Czasopisma

  ISSN: 1948-9366

• World Journal of Gastrointestinal Oncology

  Czasopisma

  ISSN: 1948-5204

• Journal of Gastrointestinal and Liver Diseases

  Czasopisma

  ISSN: 1841-8724 , eISSN: 1842-1121

• International Journal of Gastrointestinal Intervention

  Czasopisma

  ISSN: 2636-0004 , eISSN: 2636-0012

• Therapeutic Advances in Gastrointestinal Endoscopy

  Czasopisma

  ISSN: 2631-7745

• Techniques and Innovations in Gastrointestinal Endoscopy

  Czasopisma

  ISSN: 2666-5107 , eISSN: 2590-0307

• New Features of Entall Database: Comparison of Experimental and Model Formation Enthalpies/ Nowe Funkcje Bazy Danych Entall: Porównanie Doświadczalnych I Modelowych Entalpii Tworzenia

  Publikacja

  • A. Debski
  • R. Debski
  • W. Gasior
  • A. Dębski

  - Archives of Metallurgy and Materials - Rok 2014

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• Volatile organic compounds in gastrointestinal stromal tumour tissue originating from patient-derived xenografts

  Publikacja

  • R. Wawrzyniak
  • A. Woźniak
  • Y. Gebreyohannes
  • B. Dykcik
  • P. Schöffski
  • M. Markuszewski

  - Journal of Breath Research - Rok 2017

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• Performance and emission characteristics of diesel engines running on gaseous fuels in dual-fuel mode

  Publikacja

  • N. V. Nguyen
  • S. K. Nayak
  • H. S. Le
  • J. Kowalski
  • B. Deepanraj
  • X. Q. Duong
  • T. H. Truong
  • D. V. Tran
  • N. D. Cao
  • P. Q. P. Nguyen

  - INTERNATIONAL JOURNAL OF HYDROGEN ENERGY - Rok 2024

  Conventional fossil fuels are being substituted with alternative green fuels because of their greenhouse gas emissions and pollution problems, which pose a severe threat to the environment. Several studies have reported the usage of biodiesel and gaseous fuels in both single and dual-fuel modes. Gaseous fuels such as producer gas, biogas, syngas, and hydrogen produced from renewable biomass could potentially be used along with...

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• Type 2 Diabetes Remission 5 Years After Laparoscopic Sleeve Gastrectomy: Multicenter Cohort Study

  Publikacja

  • M. Mizera
  • M. Wysocki
  • K. Bartosiak
  • P. Franczak
  • H. Hady
  • P. Kalinowski
  • P. Myśliwiec
  • M. Orłowski
  • R. Paluszkiewicz
  • J. Piecuch... i 4 innych

  - OBESITY SURGERY - Rok 2021

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• Outcomes of sleeve gastrectomy in patients older than 60 years: a multicenter matched case-control study

  Publikacja

  • N. Dowgiałło-Wnukiewicz
  • M. Janik
  • P. Lech
  • P. Major
  • M. Pędziwiatr
  • P. Kowalewski
  • M. Walędziak
  • M. Wysocki
  • M. Michalik

  - Wideochirurgia i Inne Techniki Maloinwazyjne - Rok 2020

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• Effect of Significant Postoperative Complications on Decision Regret After Laparoscopic Sleeve Gastrectomy: a Case–Control Study

  Publikacja

  • K. Bartosiak
  • M. Janik
  • M. Walędziak
  • K. Paśnik
  • A. Kwiatkowski

  - OBESITY SURGERY - Rok 2022

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• Optimization of the Relative Humidity of Reactant Gases in Hydrogen Fuel Cells Using Dynamic Impedance Measurements

  Publikacja

  • E. Janicka
  • M. Mielniczek
  • Ł. Gaweł
  • K. Darowicki

  - ENERGIES - Rok 2021

  Water management is a key factor affecting the efficiency of proton exchange membrane fuel cells (PEMFCs). The currently used monitoring methods of PEMFCs provide limited information about which processes or components that humidity has a significant impact upon. Herein, we propose the use of a novel approach of impedance measurements using a multi-sinusoidal perturbation signal, which enables impedance measurements under dynamic...

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• Gastroenterologia Kliniczna - Postępy i Standardy

  Czasopisma

  ISSN: 2081-1020 , eISSN: 2081-5115

• Revista de Gastroenterologia de Mexico

  Czasopisma

  ISSN: 0375-0906

• Influence of TiO2 hydrophilicity on the photocatalytic decomposition of gaseous acetaldehyde in a circulated flow reactor

  Publikacja

  • B. Tryba
  • M. Tygielska
  • J. Orlikowski
  • J. Przepiórski
  • B. Tryba

  - Reaction Kinetics Mechanisms and Catalysis - Rok 2016

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• Effect of temperature and gaseous medium on the structure and microhardness of the cobalt base clad layers

  Publikacja

  • H. Smoleńska

  - CHEMICKE LISTY - Rok 2010

  Badano wpływ temperatury utleniania na mikrostrukturę i mikrotwardość napawanych warstw ze stopu kobaltu. Warstwy wytwarzano za pomocą napawania plazmowego (pta) na przylgniach zaworów wylotowych wykonanych ze stali x40CrSiMo10-2. Stop kobaltu był poddany utlenianiu w powietrzu w temperaturach od 750 °C to 1100 °C i w gazach wylotowych w temperaturze 750 °C. W wyniku utleniania zaobserwowano zmanę w mikrotwardości warstw. W zewnętrznej...

• Synthesis and characterization of modified silica gel as an intermediate in the generation of gaseous standard mixtures

  Publikacja

  • M. Prokopowicz
  • K. Lewandowska
  • A. Skwierawska
  • A. Przyjazny
  • J. Biernat
  • J. Namieśnik

  - CHROMATOGRAPHIA - Rok 1997

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• ECU calibration for gaseous dual fuel supply system in compression ignition engines

  Publikacja

  • D. Stepanenko
  • Z. Kneba

  - Combustion Engines - Rok 2020

  The dual fuel (DF) combustion mode is proven solution that allows to improve or get at the same level engine performance and reduce toxic compounds in exhaust gases which is confirmed by researchers and end-users. DF combustion mode uses two fuels gaseous fuel as a primary energy source and a pilot quantity of diesel fuel as ignition source. However, in order, to fully take advantage of the potential of the dual fuel mode, DF system...

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• Key issues in modeling and optimization of lignocellulosic biomass fermentative conversion to gaseous biofuels

  Publikacja

  • K. Kucharska
  • I. Hołowacz
  • D. Konopacka-Łyskawa
  • P. Rybarczyk
  • M. A. Kamiński

  - RENEWABLE ENERGY - Rok 2018

  The industrial-scale production of lignocellulosic-based biofuels from biomass is expected to benefit society and the environment. The main pathways of residues processing include advanced hydrolysis and fermentation, pyrolysis, gasification, chemical synthesis and biological processes. The products of such treatment are second generation biofuels. The degree of fermentation of organic substances depends primarily on their composition...

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• A Comparison of the Prevalence of Gastrointestinal Parasites in Wild Boar (Sus scrofa L.) Foraging in Urban and Suburban Areas

  Publikacja

  • B. Pilarczyk
  • A. Tomza-Marciniak
  • R. Pilarczyk
  • L. Felska-Błaszczyk
  • M. Bąkowska
  • J. Udała
  • M. K. Juszczak-Czasnojć

  - Animals - Rok 2024

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• CURRENT OPINION IN GASTROENTEROLOGY

  Czasopisma

  ISSN: 0267-1379 , eISSN: 1531-7056

• CANADIAN JOURNAL OF GASTROENTEROLOGY

  Czasopisma

  ISSN: 0835-7900

• Clinical Gastroenterology and Hepatology

  Czasopisma

  ISSN: 1542-3565 , eISSN: 1542-7714

• WORLD JOURNAL OF GASTROENTEROLOGY

  Czasopisma

  ISSN: 1007-9327 , eISSN: 2219-2840

• BMJ Open Gastroenterology

  Czasopisma

  ISSN: 2054-4774

• Therapeutic Advances in Gastroenterology

  Czasopisma

  ISSN: 1756-283X , eISSN: 1756-2848

• Clinical and Translational Gastroenterology

  Czasopisma

  ISSN: 2155-384X

• Indian Journal of Gastroenterology

  Czasopisma

  ISSN: 0254-8860 , eISSN: 0975-0711

• Saudi Journal of Gastroenterology

  Czasopisma

  ISSN: 1319-3767 , eISSN: 1998-4049

• Clinical and Experimental Gastroenterology

  Czasopisma

  ISSN: 1178-7023

• Clinical Journal of Gastroenterology

  Czasopisma

  ISSN: 1865-7257 , eISSN: 1865-7265

• Arab Journal of Gastroenterology

  Czasopisma

  ISSN: 1687-1979 , eISSN: 2090-2387

• Current Gastroenterology Reports

  Czasopisma

  ISSN: 1522-8037

• Surgery, Gastroenterology and Oncology

  Czasopisma

  ISSN: 2559-723X

• Japanese Journal of Gastroenterology

  Czasopisma

  ISSN: 0446-6586

• Chinese Journal of Gastroenterology

  Czasopisma

  ISSN: 1008-7125

• Case Reports in Gastroenterology

  Czasopisma

  eISSN: 1662-0631