Wyniki wyszukiwania - Biblioteka Nauki

1

Parallel adaptive computation of same time-dependent materials- related microstructural problems

100%

Do-Quang M. , Villanueva W. , Singer-Loginova I. , Amberg G.

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2007

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tom Vol. 55, nr 2

229-237

EN

Some materials-related microstructural problems calculated using the phase-field method are presented. It is well known that the phase field method requires mesh resolution of a diffuse interface. This makes the use of mesh adaptivity essential especially for fast evolving interfaces and other transient problems. Complex problems in 3D are also computationally challenging so that parallel computations are considered necessary. In this paper, a parallel adaptive finite element scheme is proposed. The scheme keeps the level of node and edge for 2D and level of node and face for 3D instead of the complete history of refinements to facilitate derefinement. The information is local and exchange of information is minimized and also less memory is used. The parallel adaptive algorithms that run on distributed memory machines are implemented in the numerical simulation of dendritic growth and capillary-driven flows.

2

Cold Plasma Surface Modification of PLA and LDPE Polymer Plastics

100%

Leluk K.

Rocznik Ochrona Środowiska

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2023

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tom Tom 25

141--147

EN

Low-density polyethylene (LDPE) and polylactic acid (PLA) plastic films were subjected to modification using different plasma sources. Argon, nitrogen, air and oxygen were used as a gas phase throughout the process, and their impact on the material's surface properties was verified. The surface activation rate was measured via atomic force microscopy regarding the porosity factor and using the water contact angle technique. The last method – being feasible, agile and of high sensitivity to alternating physicochemical surface character – was utilised to verify the post-process stability of the modified surface. Those tests were performed extensively, up to 160 hours (contact angle) and 240 hours (atomic force microscopy).

3

Wetting for systems with an attractive effective interface potential

100%

Drzewiński A. , Szota K.

Prace Naukowe Instytutu Matematyki i Informatyki Politechniki Częstochowskiej

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2009

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tom Vol. 8, nr 2

43-46

EN

Effective Hamiltonian models for systems with attractive potentials predict the absence of the wetting transition for p < 3 (long-ranged wall-particle fields). Our numerical results based on the DMRG method that does not neglect the thermal fluctuations suggest more complex scenario.

4

Effect of rivulet mass flow rate on the surface wetted area

100%

Gajewski A. , Trela M.

Archives of Thermodynamics

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2002

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tom Vol. 23, no 1-2

101-125

EN

Theoretical and experimental investigations have been carried out concerning the influence of mass flow rate on the rivulet contact angle and further on the surface area wetted by the rivulet. Presented results clearly inducate the existence of four distinct regions with respect to the contact angle and the rivulet width. Theoretical models have been proposed for three of the regions. For the second and third regions a relevant correlation has been developed for rivulet width and presented together with the experimental data of some other authors.

5

A Model of agglomerate formation during bed wetting in the process of disc granulation

100%

Obraniak A. , Gluba T.

Chemical and Process Engineering

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2012

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tom 33

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nr 1

153-165

EN

This paper presents a method for quantitative assessment of the mechanisms of nucleation and granules growth by layering in the process of bed wetting during periodic disc granulation. This study included two initial, consecutive stages of a process with defined time courses. The first phase was a time period, in which only formation of new nuclei took place, while in the second stage simultaneous nucleation and growth of granules as a result of sticking raw material grains to pre-existing nuclei occurred. Different kinds of binding liquid were used for bed wetting in each phase. In the first phase, an aqueous solution of dye was used, and pure distilled water in the second stage. The contribution of particular mechanisms to the formation of agglomerates at different time points within the second phase of the process was determined in this study. To do that the results of bed granulometric analysis, mass balance of size fractions and the analysis of contents of a marker (dye) delivered to the bed with the binding liquid during the first phase in agglomerates were used. To assess the concentration of the dye in different size fractions of the batch, spectrophotometric analysis was utilised. The study was performed using UV-VIS JASCO V-630 spectrophotometer equipped with an integrating sphere. The sieve analysis, spectrophotometric studies and mass balance were used to determine changes in the weight of the dye containing nuclei and of the nuclei containing no dye. The aforementioned analyses were also used to assess changes in the weight of formed granules and of raw material particles attached to nuclei during simultaneous nucleation and growth of granules.

6

A Model of agglomerate formation during bed wetting in the process of disc granulation

88%

Obraniak A. , Gluba T.

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2012

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nr 1

7

Anchoring, Wetting and Symmetry-Breaking Surface Transition in Liquid Crystal Systems

88%

Poniewierski A. , Samborski A.

Polish Journal of Chemistry

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2001

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tom Vol. 75, nr 4

463-479

EN

Anematic liquid crystal in contact with a solid substrate is considered. Three types of surface phenomena are discussed: anchoring, wetting and surface phase transitions, which involve symmetry breaking in the surface layer. Where possible, we reveal relations between these phenomena. We concentrate on the following problems: anchoring on anisotropic substrates, the force balance equation at the nematic-isotropic-substrate contact line, the behaviour of the line tension in the thermodynamic limit, and the onset of the smectic-A order in the surface layer close to the bulk transition to the smectic-A phase. All these problems are studied in the framework of the Landau-de Gennes formalism. Possible directions of future studies are discussed.

8

Real-time wetting of porous media

88%

Hnat K. , Porquet D. , Merillou S. , Ghazanfarpour D.

Machine Graphics and Vision

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2006

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tom Vol. 15, No. 3/4

401-413

EN

Studying light reflection properties is a crucial factor in achieving a high degree of realism in image synthesis. Considered as a challenge in itself, it becomes even more complicated when dealing with specific changes in appearance due to external factors. Among these changes, one of the most common is wetting: surfaces appear darker and more specular as their wetting level increase. Such a phenomenon is of great visual importance in outdoor scenes under rain falls, for example. This change in appearance is mainly due to the porous nature of surfaces. In this paper, we propose to handle a porous surface BRDF post-process model in real-time and to extend it to account for wetting, with simple and intuitive parameters.

9

Grain Boundary Wetting and Material Performance in an Industrial EZ33A Mg Cast Alloy

88%

Straumal A. B. , Tsoy K. V. , Mazilkin I. A. , Nekrasov A. N. , Bryła K.

Archives of Metallurgy and Materials

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2019

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tom Vol. 64, iss. 3

869--873

EN

The grain boundary wetting phase transition in an industrial EZ33A cast alloy is studied. 12% of the grain boundaries are completely wetted at the temperature slightly higher than the eutectic transformation temperature (530°C). The fraction of wetted grain boundaries increases with temperature, reaches a maximum of 85% at 570°C, and does not change further until the alloy melts. In the as-cast state, the alloy has low ductile properties at the ambient temperature. The microstructure in the as-cast state corresponds to the wetting state at about 560°C, which indicates that the cooling rate in casting is almost equal to that in quenching. The volume and the surface fraction of the second phase and the hardness measured at the least wetted state of samples point toits good machinability. The wetting data are used to suggest a sequence of heat treatment and machining for processing EZ33A alloy parts.

10

Limit theorems for stochastic dynamical system arising in ising model analysis

88%

Szwarc R. , Topolski K.

Probability and Mathematical Statistics

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2008

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tom Vol. 28, Fasc. 2

257--270

EN

A simple stochastic dynamical system defined on the space of doubly-infinite sequences of real numbers is considered. Limit theorems for this system are proved. The results are applied to the physical model of wetting of the flat heterogeneous wall.

11

A model of agglomerate formation during bed wetting in the process of disc granulation

75%

Obraniak A. , Gluba T.

Chemical and Process Engineering

|

2012

|

tom Vol. 33, nr 1

153-165

EN

This paper presents a method for quantitative assessment of the mechanisms of nucleation and granules growth by layering in the process of bed wetting during periodic disc granulation. This study included two initial, consecutive stages of a process with defined time courses. The first phase was a time period, in which only formation of new nuclei took place, while in the second stage simultaneous nucleation and growth of granules as a result of sticking raw material grains to preexisting nuclei occurred. Different kinds of binding liquid were used for bed wetting in each phase. In the first phase, an aqueous solution of dye was used, and pure distilled water in the second stage. The contribution of particular mechanisms to the formation of agglomerates at different time points within the second phase of the process was determined in this study. To do that the results of bed granulometric analysis, mass balance of size fractions and the analysis of contents of a marker (dye) delivered to the bed with the binding liquid during the first phase in agglomerates were used. To assess the concentration of the dye in different size fractions of the batch, spectrophotometric analysis was utilised. The study was performed using UV-VIS JASCO V-630 spectrophotometer equipped with an integrating sphere. The sieve analysis, spectrophotometric studies and mass balance were used to determine changes in the weight of the dye containing nuclei and of the nuclei containing no dye. The aforementioned analyses were also used to assess changes in the weight of formed granules and of raw material particles attached to nuclei during simultaneous nucleation and growth of granules.

12

Comparison of Properties of Foaming Concentrates Containing Sodium Dodecyl Sulfate (SDS) and Cetyltrimethylammonium Bromide (CTAB) for Rescue and Decontamination Purposes

75%

Król B. , Mizerski A.

Zeszyty Naukowe SGSP / Szkoła Główna Służby Pożarniczej

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2013

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tom Nr 45 (1)

5--16

EN

The paper presents results of the research of two model and one typical foaming concentrates prepared for rescue operations connected with elimination of chemical and biological contamination. Concentrates include 20% (wt) of surfactants, 25% (wt) of solvent (ethylene glycol monobutyl ether), 2% (wt) of foam stabilizer (1-dodecanol) and 53% (wt) of water. Two surfactants were studed: SDS as the component of the K–1 concentrate and CTAB as the component of the K-2 concentrate. The course of surface tension isotherms, the wetting power and the properties of foams generated by use of the pure foaming solutions and by the same solutions with additions of acids (HCl, H2SO4, CH3COOH), bases (KOH, NaOH, Ca(OH)2) and oxidants (H2O2, ClO2) were tested. The K-1 concentrate (with SDS) had twice higher foaming power than the K-2 concentrate (with CTAB). However foam stability measured as the kinetic of solution drainage was much higher in case of foams generated from CTAB based concentrate. In each case foams showed good resistance to acids, bases and oxidants additives. The disadvantage of CTAB based solutions was their low wetting power.

PL

W artykule przedstawiono wyniki badań dwóch modelowych (K-1, K-2) oraz jednego typowego handlowego preparatu pianotwórczego (S). Są one przeznaczone do działań związanych z usuwaniem zagrożeń chemicznych i biologicznych. Badano wpływ dodatków kwasów, zasad oraz utleniaczy na właściwości roztworów środków pianotwórczych (zdolność zwilżania, zdolność pianotwórcza, trwałość pian).

13

Influence of wood surface processing on roughness and wetting

75%

Slabejova G. , Smidriakova M.

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

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2014

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tom 87

14

Studies on water transport in quasi two-dimensional porous systems using neutron radiography

75%

Fijał-Kirejczyk I. M. , Rogante M. , Milczarek J. J. , Żołądek-Nowak J. , Jurkowski Z. , Żołądek J. , Rusinek D.

Nukleonika

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2022

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tom Vol. 67, No. 1

3--9

EN

The spontaneous wetting and drying of flat porous samples of linen, cotton and synthetic textiles were studied using dynamic neutron radiography (DNR). The progress of the wetting process of the media was delineated from the obtained neutron dynamical radiography images. The results of the investigation reveal a non-classical behaviour of kinetics of wicking of these materials. The character of the wetting kinetics is discussed in terms of the fractal character of the tortuosity of fabric capillaries.

15

Wpływ czynników środowiskowych na właściwości mechaniczne kompozytów polimerowo-drzewnych (WPC)

75%

Zajchowski S. , Grochowska A. , Tomaszewska J. , Mirowski J. , Ryszkowska J.

Czasopismo Techniczne. Mechanika

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2009

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tom R. 106, z. 1-M

401-404

PL

W niniejszej pracy zbadano wpływ przebywania w wodzie kompozytów polimerowo - drzewnych na zmiany masy, długości, twardości oraz udarności. Do badań wykorzystano cztery rodzaje kompozytów - różniące się ilością napełniacza drzewnego oraz otrzymane za pomocą odmiennych metod przetwórstwa. Analiza otrzymanych wyników pozwala stwierdzić, że moczenie w wodzie działa niekorzystnie na WPC, zmiana właściwości zależy również od zawartości napełniacza drzewnego. Nie zauważono jednak różnic we właściwościach w przypadku stosowania różnej temperatury wytłaczania osnowy PVC. Kompozyty otrzymane poprzez wytłaczanie oraz wtryskiwanie charakteryzują się gorszymi właściwościami, niż otrzymane jedynie przez wtryskiwanie.

EN

The studies of the influence of WPC wetting on changes in weight, length, stiffness, impact resistance and were described in this thesis. Four kinds of WPC (different: content of wood flour and methods of processing) were used in our researches. From analyse of the results it was stated, that wetting process has a negative influence on WPC. The content of wood flour is also connected with properties' changes, but different temperature of extrusion does not have a significant influence. WPC obtained by both extrusion and injection are characterised to envice worse properties than WPC obtained only by injection.

16

Simulation of single fibre wetting

75%

Dembický J. , Wiener J.

Fibres & Textiles in Eastern Europe

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2010

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tom Vol. 18, no. 5 (82)

51--54

EN

A stationary system composed of a fibre, liquid and air consists of a background for the shape determination of a typical liquid at the liquid-fibre inter-phase. Up to the present, it has not been possible to define this shape by a mathematical function. In this study a differential equation was found and solved analytically, describing the liquid curve at the mentioned interphase in the air-fiber-liquid system. This equation was solved and the result calculated by a numerical method, which were then compared with the experimental data obtained by a measurement technique developed by us.

PL

Opracowano statyczny system obejmujący pojedyncze włókno, powietrze i ciecz zwilżającą usytuowanych na odpowiednim tle. Na tej podstawie określono kształt przyjmowany przez powierzchnię cieczy w bezpośrednim sąsiedztwie włókna. Jak dotychczas nie udało się opracować równań matematycznych określających kształt cieczy. Artykuł przedstawia opracowane przez autorów równanie różniczkowe opisujące linie graniczną pomiędzy cieczą a powietrzem w sąsiedztwie włókna. Równanie to rozwiązano numerycznie uzyskując wyniki, które następnie porównano z wynikami eksperymentalnych pomiarów przeprowadzonych różnymi metodami. Uzyskano dużą zgodność wyników obliczeń z pomiarami.

17

Modele geologiczne dla węglanowych złóż o mieszanej zwilżalności

75%

Such P. , Leśniak G.

Prace Instytutu Nafty i Gazu

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2008

|

tom nr 150 wydanie konferencyjne

1083--1086

PL

Przedyskutowano wszystkie aspekty przygotowywania danych dla złóż o mieszanym typie zwilżalności. Mieszana zwilżalność sterując rozkładem przestrzennym płynów wpływa znacząco na wyniki badań i ich interpretację. Przeanalizowano zarówno wpływ przestrzennego rozkładu płynów złożowych w przestrzeni porowej jak również obecność rezydualnej materii organicznej oraz pirobituminów. Analizę wpływu mieszanej zwilżalności na parametry filtracyjne i zbiornikowe skorelowano ze specyficzną budową przestrzeni porowej tego typu złóż.

EN

Mixed wetted carbonate oil fields were discussed. Mixed wettability controls spatial distribution of reservoir fluids and affects results of analyses and their interpretation especially well logs. Additionally, presence of residual organic matter and pirobitumines in pore space of these types of rocks was discussed. Necessity of new interpretation of obtained results was shown as well as correlation between parameters of rocks and type of reservoirs (fracture-porous).

18

Automation of vision and transportation modules, implemented in the Thermo-Wet system

75%

Bąkała M. , Strzecha K. , Koszmider T. , Fabijańska A.

Automatyka / Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie

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2010

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tom T. 14, z. 3/1

395-401

EN

In this paper, a case-study of the Thermo-Wet surface tension measurement and contact angle are presented. This article shows the results of measurements of physical-chemical properties at high temperatures using cameras with different resolutions. The concept of Thermo-Wet modernization has been presented.

PL

W artykule opisano proces zautomatyzowanego pomiaru napięcia powierzchniowego i kąta zwilżania. Zaprezentowano wyniki pomiarów własności fizykochemicznych w wysokich temperaturach przy użyciu kamer o różnych rozdzielczościach. Przedstawiono koncepcję modernizacji konstrukcji urządzenia Thermo-Wet.

19

Test rig for studies of wetting properties of e.g. MEMS materials and components

75%

Nowek A.

Elektronika : konstrukcje, technologie, zastosowania

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2004

|

tom Vol. 45, nr 8-9

231-233

EN

A test rig to study wetting properties of MEMS (Micro Electro Mechanical Systems) materials, ultrathin films and real microcomponents was constructed and preliminary tests vere performed. The computer controlled system enables to form a sessile drop on the tested material/component as small as 100 micrometers in diameter. A CCD camera system supported by a special software enables to capture the drop image and its analysis to obtain the data concerning the contact angle and surface free energy of the tested materials.

PL

Przedstawiono stanowisko do badań zwilżalności materiałów stosowanych w technologii MEMS (cienkich warstw i rzeczywistych komponentów) wraz z wstępnymi wynikami badań. Komputerowo sterowany system umożliwia dokonanie pomiaru kąta zwilżania kroplami o średnicy 100 žm. Układ video, wyposażony w kamerę CCD, poprzez specjalnie do tego celu opracowane oprogramowanie umożliwia przechwytywanie obrazu kropli i przez analizę obrazu otrzymanie wielkości kąta zwilżania i energii powierzchniowej.

20

Droplet impact in icing conditions – experimental study for WE 540

71%

Lizer T. , Remer M. , Sobieraj G. , Psarski M. , Pawlak D. , Celichowski G. , Lizer T. , Remer M. , Sobieraj G. , Psarski M. , Pawlak D. , Celichowski G.

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