Skocz do pozycji: 1.

Tytuł:

Studying glycosaminoglycan derivative/protein interaction - prerequisite for the design of functional biomaterials

Autorzy:

Scharnweber, D.
Rother, S.
Kohler, L.
Hintze, V.

Powiązania:

https://bibliotekanauki.pl/articles/285480.pdf

Data publikacji:

2016

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

biomaterials
cellular microenvironment
glycosaminoglycans

Źródło:

Engineering of Biomaterials; 2016, 19, 138; 25
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:

Cryptosystem Based on Reversible Two-dimensional Cellular Automata

Autorzy:

Wiśniewski, A.

Powiązania:

https://bibliotekanauki.pl/articles/92870.pdf

Data publikacji:

2009

Wydawca:

Uniwersytet Przyrodniczo-Humanistyczny w Siedlcach

Tematy:

cellular automata
reversibility
cryptosystem

Opis:

Cellular Automata have been successfully applied to several scientific problems such as among others image processing or data encryption. One could find reversibility of dynamics is a fundamental feature of nature. While the most CA are not reversible in nature, one can find some CA with simple behavior could be reversible. Reversible cellular automata (RCA) as efficient encryption and decryption devices was originally conceived by Kari. In this introduction paper, we analyze and develop reversible cellular automata (RCA) based on Kari’s idea and some Clarridge’s concepts.

Źródło:

Studia Informatica : systems and information technology; 2009, 2(13); 97-105
1731-2264

Pojawia się w:

Studia Informatica : systems and information technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 3.

Tytuł:

RCAFE Based Numerical Model of Dynamic Recrystallization

Autorzy:

Legwand, A.
Sitko, M.
Perzyński, K.
Madej, Ł.

Powiązania:

https://bibliotekanauki.pl/articles/100012.pdf

Data publikacji:

2016

Wydawca:

Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych

Tematy:

cellular automata
RCAFE
recrystallization

Opis:

The main goal of the paper is dedicated to proper arrangement of the Finite Element (FE) and Random Cellular Automata (RCA) methods in order to develop numerical model of dynamic recrystallization (DRX) and therefore to simulate microstructure morphology changes during plastic deformation at elevated temperatures. In the approach, Finite Element solver provides information on equivalent stress and strain fields after subsequent time steps. Then these data are transferred to RCA model, which is responsible for evaluation of corresponding microstructure morphology evolution and dislocation density changes. Finally, information from the CA part is send back to the FE solver as an input for the next time step. As a result, a fully coupled RCAFE model to simulate progress of DRX is established. The present paper is directly focused on development of algorithms and methods to transfer input/output data between both FE and RCA models. The developed communication protocol is based on the Abaqus VUMAT subroutine. Examples of obtained results from the developed model are also presented to highlight its potential.

Źródło:

Journal of Machine Engineering; 2016, 16, 2; 52-60
1895-7595
2391-8071

Pojawia się w:

Journal of Machine Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 4.

Tytuł:

Application of modified Ritchie-Knott-Rice criterion to cellular automata

Autorzy:

Janus-Gałkiewicz, Urszula
Neimitz, Andrzej

Powiązania:

https://bibliotekanauki.pl/articles/280710.pdf

Data publikacji:

2019

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

fracture mechanics
cleavage
cellular automata

Opis:

In this paper, the cellular automata model is applied to analyse cleavage and ductile fracture in front of a crack in three-point-bend specimens made of Hardox-400 steel. The research programme was composed of experiments followed by fractographic and numerical analyses. On the basis of microscopic observations, the sizes of cells used in the automata were determined. The algorithm enabled mapping of the two-dimensional crack surface as well as a simulation of temperature-dependent failure mechanisms by defining transition rules based on the modified Ritchie-Knott-Rice cleavage fracture criterion. The critical stress values were estimated and verified by the cellular automata model.

Źródło:

Journal of Theoretical and Applied Mechanics; 2019, 57, 3; 577-590
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 5.

Tytuł:

The comparison of properties of three-layer cellular material and wood-based panels
Porównanie właściwości trzywarstwowego materiału komórkowego oraz płyt drewnopochodnych

Autorzy:

Iejavs, J.
Spulle, U.
Jakovlevs, V.

Powiązania:

https://bibliotekanauki.pl/articles/52758.pdf

Data publikacji:

2011

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Technologii Drewna

Tematy:

comparison
wood property
three-layer cellular material
cellular wood material
wood-based panel

Opis:

In recent years a reduced weight cell panel, whose trade mark is Dendrolight, has gained worldwide recognition thanks to the opening of an experimental factory in Austria and the start-up of a new industrial factory in Latvia with manufacturing capacity of 65 thousand m3 cell board material per year. Hitherto the internal layer of cell panel of cellular wood material type has been produced mainly from softwoods like Norway spruce (Picea abies L.) or Scots pine (Pinus sylvestris L.) covered with plywood, solid wood, particleboard or other material. The reduced weight cell panel has many applications in the furniture industry, internal cladding, door production, the transport manufacturing industry, and possibly in the construction panel production. The essential goal of the research was to identify possible applications of aspen (Populus tremula L.) wood, which is a common broad-leaved tree in Latvia, as an alternative material to Norway spruce in the production of reduced weight cell panel. The aim of the initial research was to investigate some physical and mechanical properties of aspen cell panel covered with aspen and plywood as well as to compare these physical and mechanical properties with the properties of wood-based panels. The following raw materials were used: finger jointed aspen for internal layer; finger jointed aspen and three-layer birch plywood for external layer; polyurethane and polyvinylacetate adhesives for internal and external layer gluing. Tests of obtained aspen panel were carried out in accordance with current test standards for testing of panel and timber properties. The following panel parameters were determined: moisture content, density, swelling in thickness after 24-hour immersion in water, tensile strength, three-point bending strength and modulus of elasticity, and four-point bending strength. A relevant conclusion: panels of cellular wood material type produced from aspen wood have similar physical and mechanical properties to such cell panels produced from spruce wood.
Płyty komórkowe o obniżonej gęstości mają szerokie zastosowanie w przemyśle meblarskim, wyposażeniu wnętrz, produkcji drzwi, środkach transportu. Mogą być również stosowane w wytwarzaniu płyt konstrukcyjnych. Założeniem badań było określenie przydatności drewna topoli (Populus tremula), rozpowszechnionego na Łotwie, jako substytutu drewna świerku, w produkcji płyt o obniżonej gęstości. W badaniach wykorzystano: drewno topoli na warstwę środkową, trzywarstwową sklejkę brzozową na warstwy zewnętrzne oraz kleje poliuretanowe i polioctanowinylowe. Zbadano następujące parametry wytworzonych płyt: gęstość, wilgotność, spęcznienie, wytrzymałość na rozciąganie, wytrzymałość na zginanie i moduł sprężystości. W podsumowaniu stwierdzono, iż płyty komórkowe wytworzone z drewna topoli charakteryzują się podobnymi właściwościami fizycznymi i mechanicznymi jak płyty komórkowe wytworzone z drewna świerku.

Źródło:

Drewno. Prace Naukowe. Doniesienia. Komunikaty; 2011, 54, 185
1644-3985

Pojawia się w:

Drewno. Prace Naukowe. Doniesienia. Komunikaty

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 6.

Tytuł:

Comparative study of bending stiffness of sandwich plates with cellular cores
Studium porównawcze sztywności giętnej płyty sandwichowej z wypełnieniem materiałem komórkowym o strukturze honeycomb oraz z wypełnieniem auksetycznym

Autorzy:

Janus-Michalska, M.
Jasińska, D.

Powiązania:

https://bibliotekanauki.pl/articles/195208.pdf

Data publikacji:

2017

Wydawca:

Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza

Tematy:

sandwich plates
auxetic cellular material
cellular core
płyty sandwichowe
auksetyczne materiały komórkowe
wypełnienie komórkowe

Opis:

This paper presents numerical simulation of a sandwich plate bending. Two types of plates are considered: with a cellular honeycomb core and with the cellular auxetic core. Finite element method (FEM) calculations are performed by means of ABAQUS system for determination of plates bending stiffness. Three methods are presented. The first one, numerically expensive, is based on detailed modelling of cellular core structure, the second applies laminated plate theory with an equivalent core stiffness, the third applies theory of composite beams. The results show limitations of applicability of abovementioned models to stiffness modelling. The influence of core lattice geometry parameters on plate stiffness is studied.
W artykule przedstawiono numeryczne symulacje testów zginania płyt sandwichowych wypełnionych materiałami komórkowymi o strukturze plastra miodu oraz strukturze auksetycznej. Celem wyznaczenia sztywności giętnej płyt wykonano obliczenia numeryczne w systemie ABAQUS metodą elementów skończonych. Prezentowane są dwie metody. Pierwsza kosztowna numerycznie polega na szczegółowym modelowaniu struktury komórkowej, druga stosuje teorię laminatów, trzecia teorię belek zespolonych. Wyniki wskazują na możliwość modelowania sztywności giętnej płyty. Przeanalizowano wpływ parametrów geometrycznych, a w szczególności auksetyczności struktury.

Źródło:

Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika; 2017, z. 89 [295], 2; 63-70
0209-2689
2300-5211

Pojawia się w:

Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:

Simulation of the electrophoresis of DNA by the method of cellular automata

Autorzy:

Krawczyk, Małgorzata
Kułakowski, Krzysztof

Powiązania:

https://bibliotekanauki.pl/articles/747601.pdf

Data publikacji:

2002

Wydawca:

Polskie Towarzystwo Matematyczne

Tematy:

Biochemistry, molecular biology
Cellular automata

Opis:

.
The authors give the description of a new cellular automaton for simulating the electrophoresis of gel DNA. This automaton is deterministic, which corresponds to the well-known Monte Carlo rules holding for the electrophoresis at a low temperature and a high intensity electric field. The experimental results indicate that under such conditions the electrophoresis efficiency depends significantly on the string length.

Źródło:

Mathematica Applicanda; 2002, 30, 44/03
1730-2668
2299-4009

Pojawia się w:

Mathematica Applicanda

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 8.

Tytuł:

Wykorzystanie automatów komórkowych w modelowaniu ruchu drogowego
Use of cellular automata for traffic analysis

Autorzy:

Małecki, K.
Rokita, M.
Wątróbski, J.

Powiązania:

https://bibliotekanauki.pl/articles/154665.pdf

Data publikacji:

2010

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

automaty komórkowe
symulacja
cellular automata
simulation

Opis:

Uniwersalność automatów komórkowych spowodowała, iż znajdują zastosowanie w wielu dziedzinach, np. w modelowaniu i symulacji ruchu drogowego. Autorzy prezentują dokonania w tym zakresie (tab. 1) oraz formułują nowy model, będący rozwinięciem modelu skrzyżowania dróg prezentowanego w [1] i [8]. Dodatkowo autorzy przedstawiają charakterystykę opracowanego, nowatorskiego systemu, umożliwiającego modelowanie dowolnego obszaru (zespół skrzyżowań i dróg) oraz symulowanie ruchu w ujęciu mikroskopowym.
Cellular automata are considered by some researchers to belong to one of the IT department, which is an artificial intelligence. Even though their history goes back to the forties of the last century, much attention is still paid to the use of cellular automata for the process of testing and simulation of different phenomena. The universality of cellular automata caused their application to many areas such as: physics, computer graphics and traffic modeling. The authors present the achievements in this field (Table 1) and formulate a new traffic model which is a development of the crossroads model defined by Chowdhury-Schadschneider [1] and later by Bartodziej [8]. This new model helps to simulate traffic at the crossroads of two-lane and two-way roads. In addition, there is given the worked out system characteristics which enables modeling any area (intersections and roads) and carrying out the traffic simulations in a microscopic approach. The software consists of two applications: TrafficCA (traffic simulator based on cellular automata) and the map editor (this application enables generating any area including roads, traffic lights and the surroundings). Taking into account the fact that the simulated cases are always correct (carried out in accordance with properly defined models of cellular automata), the developed system, except for the traffic modeling, can be used for showing driver behaviour unfavourable for traffic capacity.

Źródło:

Pomiary Automatyka Kontrola; 2010, R. 56, nr 7, 7; 724-727
0032-4140

Pojawia się w:

Pomiary Automatyka Kontrola

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:

Stability of a porous-cellular cylindrical shell subjected to combined loads

Autorzy:

Belica, T.
Magnucki, K.

Powiązania:

https://bibliotekanauki.pl/articles/280196.pdf

Data publikacji:

2013

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

stability
cylindrical shell
porous-cellular material

Opis:

The subject of the paper is a metal foam circular cylindrical shell subjected to combined loads. Combinations of the external pressure and axial load are taken into account. The shell is simply supported on all outer edges. The mechanical properties of the metal foam vary continuously in the thickness direction. A non-linear hypothesis of deformation of a plane cross section of the shell is formulated. The field of displacements of any cross section and non-linear geometric relationships are assumed. The system of partial differential equations for the shell is derived on the basis of the principle of stationarity of the total potential energy. This system is approximately solved by the Bubnov-Galerkin method. The critical loads for shells are numerically determined. Results of the calculation are shown in figures.

Źródło:

Journal of Theoretical and Applied Mechanics; 2013, 51, 4; 927-936
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 10.

Tytuł:

Glycosylation of immune system proteins and its role in autoimmune diseases and cancer

Autorzy:

Trzyna, Anna
Tabarkiewicz, Jacek
Mazur, Artur

Powiązania:

https://bibliotekanauki.pl/articles/1597351.pdf

Data publikacji:

2020-03-30

Wydawca:

Uniwersytet Rzeszowski. Wydawnictwo Uniwersytetu Rzeszowskiego

Tematy:

Glycosylation
Immunity
Cellular
Humoral
Autoimmune Diseases

Opis:

Introduction. Structural glycans have great biological significance and are involved in signaling and cell communication of the immune system. They are attached to proteins and lipids in an enzymatic process called glycosylation where glycosyltransferase and glycosidases bind sugar residues and lead to the formation of bioconjugates. Aim. In this paper we describe the importance of glycosylation in the immune system and its changes in diseases. Material and methods. This review was performed according to systematic literature search of major bibliographic databases. Results. Proper glycosylation ensures the functioning of the organism, however, defects in structural glycans of immune system changes their properties and can lead to disorders and further to autoimmune diseases. It has been also proven that glycosylation of autoimmune system is changed during cancer. In this paper we described types of structural glycans, significance of glycosylation of selected components of the immune system and its modifications in disorders. Conclusions. Knowledge about changes in the glycosylation in diseases is the key to understanding the processes of autoimmune diseases and may allow the development of new treatments in the future.

Źródło:

European Journal of Clinical and Experimental Medicine; 2020, 1; 32-37
2544-2406
2544-1361

Pojawia się w:

European Journal of Clinical and Experimental Medicine

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 11.

Tytuł:

On mapping onto self-organized criticality

Autorzy:

Wiśniewski, A.

Powiązania:

https://bibliotekanauki.pl/articles/93038.pdf

Data publikacji:

2006

Wydawca:

Uniwersytet Przyrodniczo-Humanistyczny w Siedlcach

Tematy:

cellular automata
self-organizing system
criticality

Opis:

In the report we have discussed a few aspects of SOC concept which in general have strongly influence on explicitness of mapping process. SOC idea is based on group of models and/does not seem to give quite clear instructions whether mapped phenomena exhibit SOC or not. To present the problem we have performed a computer simulation in order to investigate the effect of the critical point within the system evolution process without conservation. We have considered that on two-dimensional cellular automata whose rule consists of one or two subrules. The first one, based on Conway’s model (or very similar to), has represented the local behavior of transmission processes and has been applied in the experiment synchronously, as a fundamental mode. The second one, called a transport rule, has been applied sequentially. That subrule has described the motion of a fraction of individuals. As a result of comparing models of the various sets of rules for the applied size of lattice, we could find that the modified Conway’s model would be merely treated as subcritical.

Źródło:

Studia Informatica : systems and information technology; 2006, 1(7); 207-216
1731-2264

Pojawia się w:

Studia Informatica : systems and information technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 12.

Tytuł:

Immunosuppressive influence of Anguillid herpesvirus-1 (AngHV-1) infection on cellular defense mechanisms in European eel (Anguilla anguilla)

Autorzy:

Schulz, P.
Deperasińska, I.
Kaczorek-Łukowska, E.
Siwicki, A.K.

Powiązania:

https://bibliotekanauki.pl/articles/2087405.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

alloherpesviruses
cellular immunity
immunosuppression
innate immunity

Źródło:

Polish Journal of Veterinary Sciences; 2019, 4; 785-787
1505-1773

Pojawia się w:

Polish Journal of Veterinary Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 13.

Tytuł:

Cellular automata: structures and some applications
Automaty komórkowe: struktura i pewne zastosowania

Autorzy:

Burzyński, M.
Cudny, W.
Kosiński, W.

Powiązania:

https://bibliotekanauki.pl/articles/282005.pdf

Data publikacji:

2004

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

cellular automata
traffic flow
fuzzy rules

Opis:

A new approach to the modelling of various nature phenomena such as predator and prey ecological system, heat transport, spreading of oil slick and traffic flow is introduced. Cellular automata (CA) are discrete dynamical systems whose behaviour is completely specified in terms of simple local relations. They are mathematical models of spatialy distributed processes; however they can lead to an appropriate simulation of comlex dynamic processes. Applications to heat transfer and problems of environmental simulations are done. A discrete automaton model with fuzzy rules to simulate one-way traffic flow is also described. Results of simulations are consistent with phenomena observed in reality. It gives a base to propose the cellular automata tool as an option in modelling and solving problems of complex (and some times, not completely known) nature.
W pracy zaprezentowano metodę modelowania układów i zjawisk obserwowanych w przyrodzie, takich jak dynamika systemu ekologicznego drapieżnik-ofiara, przewodzenie ciepła, rozprzestrzenianie się plamy ropy naftowej po wycieku na wodzie czy ruch strumienia pojazdów na drodze miejskiej. Metodę oparto na tzw. automatach komórkowych, które są układami dyskretnymi o zachowaniach ściśle zdeterminowanych prostymi relacjami o charakterze lokalnym. Automaty komórkowe to matematyczne modele procesów przestrzennych, mogące z powodzeniem opisywać złożone zjawiska dynamiczne. W pracy przedstawiono aplikację do zagadnienia przewodzenia ciepła oraz kilku symulacji środowiskowych. Przedstawiono także model automatowy z regułami rozmytymi opisujący jednokierunkowy ruch pojazdów na drodze. Wyniki symulacji okazały się zgodne z obserwacjami rzeczywistych układów. Zachęcające rezultaty badań skłaniają do postrzegania automatów komórkowych jako efektywnej opcji w modelowaniu i rozwiązywaniu problemów o złożonej (czasem nie całkiem rozpoznanej) naturze.

Źródło:

Journal of Theoretical and Applied Mechanics; 2004, 42, 3; 461-482
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:

The importance of the nuclear and cytoplasmic signalling in the cellular response to ionizing radiation

Autorzy:

Szumiel, I.

Powiązania:

https://bibliotekanauki.pl/articles/146716.pdf

Data publikacji:

2000

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

cellular signalling pathways
ionizing radiation
radiation sensitivity

Opis:

DNA is the universal primary target for ionizing radiation; however, the cellular response is highly diversified not only by differential DNA repair ability. The monitoring system for the ionizing radiation-inflicted DNA damage consists of 3 apparently independently acting enzymes which are activated by DNA breaks: two protein kinases, Atm (ataxia telangiectasia mutated) and DNA-PK (DNA-dependent protein kinase) and a poly(ADP-ribose) polymerase, PARP-1. These 3 enzymes are the source of alarm signals, which affect to various extents DNA repair, progression through the cell cycle and eventually the pathway to cell death. Their functions probably are partly over-lapping. On the side of DNA repair their role consists in recruiting and/or activating the repair enzymes, as well as preventing illegitimate recombination of the damaged sites. A large part of the nuclear signalling pathway, including the integrating role of Tp53 has been revealed. Two main signalling pathways start at the plasma membrane: the MAPK/ERK (mitogen and extracellular signal regulated protein kinase family) "survival pathway" and the SAPK/JNK (stress-activated protein kinase/c-Jun N-terminal kinase) "cell death pathway". The balance between them is likely to determine the cell’s fate. When DNA break rejoining is impaired, the cell is unconditionally radiation sensitive. The fate of a repair-competent cell is determined by the time factor: the cell cycle arrest should be long enough to ensure the completion of repair. Incomplete repair or misrepair may be tolerated, when generation of the death signal is prevented. So, the character and timing of the signals are, to a large part, responsible for the cellular intrinsic radiation sensitivity and depend on the characteristics of the cellular signalling web.

Źródło:

Nukleonika; 2000, 45, 4; 215-220
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 15.

Tytuł:

Dynamic stability of a metal foam circular plate
Stateczność dynamiczna płyty kołowej wykonanej z piany metalowej

Autorzy:

Magnucka-Blandzi, E.

Powiązania:

https://bibliotekanauki.pl/articles/281745.pdf

Data publikacji:

2009

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

circular plate
dynamic stability
porous-cellular metal

Opis:

The study is devoted to a radial compressed metal foam circular plate. Properties of the plate vary across its thickness. The middle plane of the plate is its symmetry plane. First of all, a displacement field of any cross-section of the plate was defined. Afterwards, the components of strain and stress states were found. The Hamilton principle allowed one to formulate a system of differential equations of dynamic stability of the plate. This basic system of equations was approximately solved. The forms of unknown functions were assumed and the system of equations was reduced to a single ordinary differential equation of motion. The equation was then numerically processed that allowed one to determine critical loads for a family of metal foam plates. The results of studies are shown in figures. They show the effect of porosity of the plate on the critical loads. The results obtained for porous plates were compared to homogeneous circular plates.
Przedmiotem badań jest osiowo ściskana porowata płyta kołowa.Własności płyty są zmienne na jej grubości. Środkowa płaszczyzna płyty jest jej płaszczyzną symetrii. Zdefiniowano pole przemieszczeń dla dowolnego przekroju płyty. Ponadto wyznaczone są składowe stanów odkształceń i naprężeń. Układ równań stateczności dynamicznej płyty wyznaczono z zasady Hamiltona. Następnie równania te rozwiązano metodą Galerkina i otrzymano zwyczajne równanie różniczkowe typu Mathieu. Równanie to rozwiązano metodą Rungego-Kutty i wyznaczono obciążenia krytyczne dla rodziny płyt kołowych. Wyniki przedstawiono na wykresach. Wskazano wpływ porowatości materiału na obciążenia krytyczne płyty. Otrzymane wyniki porównano z odpowiednimi wielkościami dla płyty jednorodnej.

Źródło:

Journal of Theoretical and Applied Mechanics; 2009, 47, 2; 421-433
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 16.

Tytuł:

Effect of water flows on ship traffic in narrow water channels based on cellular automata

Autorzy:

Hu, H.
Chen, X.
Sun, Z.

Powiązania:

https://bibliotekanauki.pl/articles/260068.pdf

Data publikacji:

2017

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

narrow channel
cellular automata
simulation
ship interaction

Opis:

In narrow water channels, ship traffic may be affected by water flows and ship interactions. Studying their effects can help maritime authorities to establish appropriate management strategies. In this study, a two-lane cellular automation model is proposed. Further, the behavior of ship traffic is analyzed by setting different water flow velocities and considering ship interactions. Numerical experiment results show that the ship traffic density-flux relation is significantly different from the results obtained by classical models. Furthermore, due to ship interactions, the ship lane-change rate is influenced by the water flow to a certain degree.

Źródło:

Polish Maritime Research; 2017, S 3; 130-135
1233-2585

Pojawia się w:

Polish Maritime Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 17.

Tytuł:

Immunohistochemical evaluation of the influence of L-arginine on biomarkers of environmental (cellular) stress in the kidneys of pregnant female rats

Autorzy:

Pedrycz, Agnieszka
Siermontowski, Piotr

Powiązania:

https://bibliotekanauki.pl/articles/989964.pdf

Data publikacji:

2017

Wydawca:

Instytut Medycyny Wsi

Tematy:

nitric oxide
cellular stress
kidneys
pregnancy
immunohistochemistry

Opis:

Introduction. Kidney damage during pregnancy constitutes a diagnostic and therapeutic challenge. However, it is not entirely known whether a kidney condition recognised before the pregnancy releases an organism’s response to pregnancy, or whether pregnancy itself worsens kidney function. Objective. The aim of the study was immunohistochemical evaluation of cells of kidneys of pregnant rats under the influence of nitric oxide (NO), with measurement of the immunoexpression of cellular stress markers (p-53, HSP 70). The dose of administered L-arginine (NO substrate) was approximated to that applied in obstetrics in gestosis prevention and treatment in pregnant women. Materials and method. 60 female rats used in experiment were divided into 6 groups: 3 experimental and 3 control. The females from experimental groups were administered L-arginine (40g/kg, per os) every other day starting from the seventh day or pregnancy. The animals were decapitated on the 10th, 20th day of pregnancy, and 10 days after the delivery. Kidneys taken from decapitated rats were evaluated using the immunohistochemical three step method. HSP 70 and p-53 proteins were detected. Conclusions. L-arginine increased the expression of p-53 protein – on the 10th day of pregnancy, which increased at the end of pregnancy; however, 10 days after delivery the level dropped below that observable during physiological pregnancy. Hormonal changes in physiological pregnancy cause an increase in expression of the p-53 (cell stress marker) in the epithelial cells of renal tubules, mainly at the end of pregnancy (20th day). 10 days after the delivery, this expression decreases. The expression of HSP-70 protein increases already on the 10th day of pregnancy and maintains a similar level throughout the pregnancy, but is reduced after the puerperium.

Źródło:

Annals of Agricultural and Environmental Medicine; 2017, 24, 1
1232-1966

Pojawia się w:

Annals of Agricultural and Environmental Medicine

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 18.

Tytuł:

Modelling of CDMA systems

Autorzy:

Gajewski, P.
Krygier, J.

Powiązania:

https://bibliotekanauki.pl/articles/308360.pdf

Data publikacji:

2001

Wydawca:

Instytut Łączności - Państwowy Instytut Badawczy

Tematy:

OPNET
DS-CDMA
cellular systems
network simulation

Opis:

This paper describes a model of a system with wideband CDMA that is a proposal of user access for future UMTS. This model has been implemented using OPNET tool. The model enables network architecture, radio interface, mobile station motion, call generation, signalling, etc. The examples of simulation results of call and handover blocking probability are also presented in this paper.

Źródło:

Journal of Telecommunications and Information Technology; 2001, 2; 35-40
1509-4553
1899-8852

Pojawia się w:

Journal of Telecommunications and Information Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 19.

Tytuł:

Waterlogging tolerance: A review on regulative morpho-physiological homeostasis of crop plants

Autorzy:

Sharma, Shubhangani
Sharma, Jyotshana
Soni, Vineet
Kalaji, Hazem M.
Elsheery, Nabil I.

Powiązania:

https://bibliotekanauki.pl/articles/1844317.pdf

Data publikacji:

2021

Wydawca:

Instytut Technologiczno-Przyrodniczy

Tematy:

antioxidants
cellular metabolites
climate change
photosynthesis
waterlogging

Opis:

The natural environment is being drastically affected by climate change. Under these severe environmental conditions, the growth and productivity of agricultural crops have reduced. Due to unpredictable rainfall, crops growing in the field are often exposed to waterlogging. This leads to significant crop damage and production losses. In this review paper, the morphological and physiological adaptations such as development of aerenchyma, adventitious roots, radial root oxygen loss barrier, and changes in chlorophyll fluorescence parameters of crops under waterlogging are discussed. This will help to understand the effects of waterlogging on various crops and their adaptation that promotes crop growth and productivity. To meet the food requirements of a growing population, the development of waterlogging tolerant crops by screening and plant breeding methods is necessary for plant breeders. Better knowledge of physiological mechanisms in response to waterlogging will facilitate the development of techniques and methods to improve tolerance in crops.

Źródło:

Journal of Water and Land Development; 2021, 49; 16-28
1429-7426
2083-4535

Pojawia się w:

Journal of Water and Land Development

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 20.

Tytuł:

Using shared memory as a cache in cellular automata water flow simulations on GPUs

Autorzy:

Topa, P.
Młocek, P.

Powiązania:

https://bibliotekanauki.pl/articles/305529.pdf

Data publikacji:

2013

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH

Tematy:

cellular automata
GPU computation
modelling physical phenomena

Opis:

Graphics processors (GPU – Graphic Processor Units) recently have gained a lot of interest as an efficient platform for general-purpose computation. Cellular Automata approach which is inherently parallel gives the opportunity to implement high performance simulations. This paper presents how shared memory in GPU can be used to improve performance for Cellular Automata models. In our previous works, we proposed algorithms for Cellular Automata model that use only a GPU global memory. Using a profiling tool, we found bottlenecks in our approach. With this paper, we will introduce modifications that takes an advantage of fast shared memory. The modified algorithm is presented in details, and the results of profiling and performance test are demonstrated. Our unique achievement is comparing the efficiency of the same algorithm working with a global and shared memory.

Źródło:

Computer Science; 2013, 14 (3); 385-401
1508-2806
2300-7036

Pojawia się w:

Computer Science

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 21.

Tytuł:

Critical Phenomena : Towards Modeling with Cellular Automata

Autorzy:

Wiśniewski, A.

Powiązania:

https://bibliotekanauki.pl/articles/92942.pdf

Data publikacji:

2007

Wydawca:

Uniwersytet Przyrodniczo-Humanistyczny w Siedlcach

Tematy:

phase transitions
cellular automata
self-organized criticality

Opis:

The paper presents basic description methods of critical phenomena, i.e. first-order, continuous phase transitions, and an overview of the self-organized criticality concept. In this approach an attempt is made to identify the determinant factors of modeling critical events using cellular automata.

Źródło:

Studia Informatica : systems and information technology; 2007, 2(9); 69-76
1731-2264

Pojawia się w:

Studia Informatica : systems and information technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 22.

Tytuł:

The Complex Computer System Based on Cellular Automata Method Designed to Support Modelling of Laminar Cooling Processes

Autorzy:

Gołąb, R.
Madej, Ł.
Pietrzyk, M.

Powiązania:

https://bibliotekanauki.pl/articles/100057.pdf

Data publikacji:

2014

Wydawca:

Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych

Tematy:

cellular automata
finite element method
cooling process

Opis:

The user friendly computer system that have the capability of modelling material behaviour both at the macro and micro scales was developed in this work. The system was designed to predict microstructure evolution during phase transformation in laminar cooling conditions with the use of the multi scale cellular automata finite element (CAFE) model. The finite element (FE) part is based on the conventional Fourier type equation and is used to predict macroscopic temperature distribution. This is an input for the micro scale cellular automata (CA) model of austenite-ferrite phase transformation. To facilitate the research, proposed micro scale CA model was implemented within developed universal object-oriented programming framework CAF. Description of major assumptions and functionality of the developed numerical system including efficient Graphical User Interface (GUI) is presented in the paper. The intuitive visualization of data obtained in different length scales facilitates work with the software.

Źródło:

Journal of Machine Engineering; 2014, 14, 1; 63-73
1895-7595
2391-8071

Pojawia się w:

Journal of Machine Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 23.

Tytuł:

Simulation of changes of the Warsaw urban area 1969-2023 (application of cellular automata)

Autorzy:

Werner, Piotr

Powiązania:

https://bibliotekanauki.pl/articles/2032490.pdf

Data publikacji:

2006-06-01

Wydawca:

Uniwersytet Warszawski. Wydział Geografii i Studiów Regionalnych

Tematy:

cellular automata
GIS
spatio-temporal processes
urbanization

Opis:

It is possible to make analyses within the field of GIS applying cellular automata. One of the purposes of socio-economic geography is indirect understanding of the phenomenon by analyzing spatial patterns and inferring spatio-temporal processes looking rather for local hotspots. The cellular automata are the tool both for spatio-temporal inferring based on local conditions and data visualization. The evidence is the case study of spatial simulation of Warsaw Urban Area (Poland). The author verifies the hypothesis that the present layout and extent of the Warsaw agglomeration determines further directions of the city's spatial development. To this end, he employs a method based on cellular automata theory.

Źródło:

Miscellanea Geographica. Regional Studies on Development; 2006, 12; 329-335
0867-6046
2084-6118

Pojawia się w:

Miscellanea Geographica. Regional Studies on Development

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 24.

Tytuł:

Connexin-dependent intercellular stress signaling in tissue homeostasis and tumor development

Autorzy:

Czyż, Jarosław
Piwowarczyk, Katarzyna
Paw, Milena
Luty, Marcin
Wróbel, Tomasz
Catapano, Jessica
Madeja, Zbigniew
Ryszawy, Damian

Powiązania:

https://bibliotekanauki.pl/articles/1038572.pdf

Data publikacji:

2017

Wydawca:

Polskie Towarzystwo Biochemiczne

Tematy:

carcinogenesis
connexin
gap junctions
cellular stress
tumor

Opis:

Cellular stress responses determine tissue development, homeostasis and pathogenesis. Paracrine signaling, exchange of mechanical stimuli and intercellular transfer of small metabolites via connexin-built gap junctional channels are involved in the cellular stress detection and propagation of stress stimuli in multicellular networks. Cellular stress responses are also regulated through the activity of unpaired connexons (hemichannels) and via the intracellular interference of connexins with the cell cycle and pro-apoptotic machinery. Therefore, connexins are considered as multidirectional transmitters of the "outside-in" and "inside-out" stress signaling that are crucial for tissue homeostasis, regeneration and pathology. In particular, the disturbance of connexin function during the multi-stage process of tumor development leads to abnormal reactions of tumor cells to stress stimuli. In this review, we outline the current knowledge on the multidirectional role of connexins in the detection of stress signals. We also discuss the role of connexin-mediated intercellular transmittance of stress signals in tumour promotion, progression and metastatic cascade. Highlights: 1. Connexins and gap junctions protect cells from the microenvironmental stress and are involved in propagation and intracellular processing of stress signals. 2. The quality and quantity of stress stimuli, which may lead to cell adaptation or death by apoptosis, is determined by intrinsic properties of connexins and the cell phenotype. 3. Connexin deficiency increases the resistance of tumor cells to the "outside-in" stress signaling. 4. The connexin-mediated "inside-out" stress signaling participates in tumor cell invasion during the metastatic cascade.

Źródło:

Acta Biochimica Polonica; 2017, 64, 3; 377-389
0001-527X

Pojawia się w:

Acta Biochimica Polonica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 25.

Tytuł:

Fibronectin fragments in human seminal plasma.

Autorzy:

Kątnik-Prastowska, Iwona
Przybysz, Magdalena
Chełmońska-Soyta, Anna

Powiązania:

https://bibliotekanauki.pl/articles/1041450.pdf

Data publikacji:

2005

Wydawca:

Polskie Towarzystwo Biochemiczne

Tematy:

cellular domain of fibronectin
seminal plasma
fibronectin

Opis:

The study has revealed the presence of fibronectin (FN) fragments and a lack of intact FN in 72 seminal plasma samples. The FN fragmentation was examined by immunoblotting with a monoclonal antibody specific to the central cellular FN domain and was confirmed with a monoclonal antibody directed to the C-terminal domain of FN. Nine FN fragments between 60 and 200 kDa and five fragments of 60-150 kDa were identified in seminal plasma samples of normozoospermic and of terato-, oligoterato-, and oligoasthenoterato-spermic groups, respectively. The relative amounts of the 60, 90 and 100 kDa FN fragments were 2-3 times higher in seminal plasmas with abnormal semen characteristics than in the normozoospermic group. The results suggest that seminal plasma FN fragments may contribute to fertilization and the analysis of FN fragmentation may have a diagnostic value in andrological investigations.

Źródło:

Acta Biochimica Polonica; 2005, 52, 2; 557-560
0001-527X

Pojawia się w:

Acta Biochimica Polonica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 26.

Tytuł:

Radio Channels Modeling for Adaptive Antennas Applications – Analysis of Elevation, Azimuth and Delay Spread

Autorzy:

Łapszow, R.
Modelski, J.

Powiązania:

https://bibliotekanauki.pl/articles/307848.pdf

Data publikacji:

2014

Wydawca:

Instytut Łączności - Państwowy Instytut Badawczy

Tematy:

adaptive antenna
cellular systems
radio channel modeling

Opis:

Research of modeling urban environment channel has been presented in this paper. Measurements were performed for 2.2 GHz band. Test environment was based on existing 3G sites. Elevation, delay and azimuth spreads were analyzed. Both theoretical channel modeling and similar tests campaign were subject for analysis in this paper. Based on radio channel modeling further investigations are presented and the adaptive antenna implementation was proposed.

Źródło:

Journal of Telecommunications and Information Technology; 2014, 2; 35-41
1509-4553
1899-8852

Pojawia się w:

Journal of Telecommunications and Information Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 27.

Tytuł:

The effect of blowing agents on the effectiveness of poly(vinyl chloride) extrusion

Autorzy:

Garbacz, T.
Jachowicz, T.
Tor-Świątek, A.

Powiązania:

https://bibliotekanauki.pl/articles/102478.pdf

Data publikacji:

2016

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

cellular extrusion
effectiveness
polyvinyl chloride
blowing agents

Opis:

The cellular extrusion is a method for manufacturing profiles, bars, low density cellular coatings and other cellular products that have no hollow cavities on the surface and show minimal processing shrinkage, while their properties are similar to those of products produced by conventional extrusion. The paper deals with cellular extrusion of PVC. The investigation of the process was conducted using state-of-the-art endothermic and exothermic blowing agents that were dosed in up to 1.5% by weight. The experiments involved measuring output, energy consumption and energy efficiency of the process.

Źródło:

Advances in Science and Technology. Research Journal; 2016, 10, 32; 217-223
2299-8624

Pojawia się w:

Advances in Science and Technology. Research Journal

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 28.

Tytuł:

Micromechanical model of auxetic cellular materials
Model mikromechaniczny materiałów komórkowych o ujemnym współczynniku Poissona

Autorzy:

Janus-Michalska, M.

Powiązania:

https://bibliotekanauki.pl/articles/279741.pdf

Data publikacji:

2009

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

auxetic cellular materials
anisotropy
effective model
elasticity

Opis:

An effective anisotropic continuum formulation for auxetic cellular materials is the objective of this paper. A skeleton is modelled as a plane beam elastic structure with stiff joints. The skeleton topology, forming concave polygons, is responsible for negative Poisson’s ratio effect. The essential macroscopic features of mechanical behaviour are inferred from the deformation response of a representative volume element using the framework of micromechanical analysis. The strain energy of a unit cell is calculated by adding the tensile, shearing and bending strain energy of individual members. The equivalent continuum is based on averaging this energy, thus formulating the basis for computing the anisotropic stiffness matrix. The structural mechanics methodology and ANSYS finite element code are applied to solve the beam model of the skeleton. Graphical representation of certain material constants such as Young’s modulus, Poisson’s ratio, shear modulus and generalized bulk modulus is given. The results of included parametric study may be used for proper choice of geometric and material data of the skeleton for a given structural application of the anisotropic continuum.
Celem pracy jest sformułowanie efektywnego anizotropowego continuum sprężystego dla materiałów komórkowych o ujemnym współczynniku Poissona. Szkielet materiału jest modelowany przez płaską strukturę belkową połączoną w sztywnych węzłach tworzącą układ wielokątów wklęsłych. Kąty wklęsłe w strukturze materiału odpowiadają za efekt ujemnego współczynnika Poissona. Poprzez zastosowanie modelu mikromechanicznego istotne cechy mechaniczne materiału komórkowego są wyprowadzone z wyników analizy komórki reprezentatywnej. Potencjał sprężysty szkieletu komórki jest wyznaczony jako suma energii w belkach tworzących szkielet od ich rozciągania, ścinania i zginania. Efektywne continuum jest oparte na uśrednianiu potencjału sprężystego, co jest podstawą konstruowania macierzy sztywności. Metoda analizy strukturalnej przeprowadzona za pomocą programu MES-ANSYS jest stosowana dla modelu belkowego szkieletu. Jako wynik tej analizy przedstawiono graficznie rozkłady modułu Younga, współczynnika Poissona, modułu na ścinanie i uogólnionego współczynnika ściśliwości objętościowej. Studium parametryczne umożliwia prześledzenie wpływu parametrów geometrycznych struktury i charakterystyk materiału szkieletu na własności kontinuum zastępczego jako materiału o zastosowaniu strukturalnym.

Źródło:

Journal of Theoretical and Applied Mechanics; 2009, 47, 4; 737-750
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 29.

Tytuł:

Effects of X-ray on fibroblast mechanical properties

Autorzy:

Heydarian, Ashkan
Khorramymehr, Siamak
Vasaghi-Gharamaleki, Behnoosh

Powiązania:

https://bibliotekanauki.pl/articles/280421.pdf

Data publikacji:

2019

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

viscoelastic
biomechanics
cellular mechanics
X-ray effects

Opis:

Concerning the widespread use of X-rays to detect various diseases, such as oral and dental ones, it is essential to study the effects of this radiation on living cells. From the past, genetic effects and cell death because of X-rays have been studied. In addition, the effect of this ionizing radiation on the mechanical properties of the cell and cytoskeleton has been studied, but different results have been obtained based on different models. In this study, post-culture gingival fibroblast cells were classified into two groups of control and radiation with Nano Magnetic Particles functionalized by folic acid. The cells of the radiation group were exposed to X-rays of 3 mGy·cm2 . The specimens were undergone static creep test by a magnetic tweezer. Spring and damper coefficients were obtained based on the viscoelastic solid modeling. The static and dynamic stiffness of the groups was also calculated. The maximum deformation was decreased after radiation from 0.049 ± 0.01 µm to 0.029 ± 0.01 µm and the static stiffness of the model was 1.6 times decreased. Also, the gel point frequency for the control group was 27 Hz and for the radiation group was 7.5 Hz. The results show that the static and dynamic stiffness of the cells decreases after radiation, and less deformation appears in the cells after irradiation. These changes can be due to the breakdown of membrane chemical bonds and activation of actin fibers after radiation.

Źródło:

Journal of Theoretical and Applied Mechanics; 2019, 57, 4; 999-1008
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 30.

Tytuł:

Modification of the Cellular Structure with Increased Production in the Make-To-Order System

Autorzy:

Michlowicz, Edward
Smolińska, Katarzyna

Powiązania:

https://bibliotekanauki.pl/articles/504573.pdf

Data publikacji:

2018

Wydawca:

Międzynarodowa Wyższa Szkoła Logistyki i Transportu

Tematy:

cellular manufacturing,
MTO methods,
logistics engineering,
lean

Opis:

The customer market is becoming more and more demanding. Customers want to have influence on the final shape, form, functionality and characteristics of the product. As a result, entrepreneurs are forced to abandon the Make-to-Stock system in favour of the MTO (Make-to-Order) concept, with the purpose of not only meeting the customers’ needs, but also, for example, reducing the costs by manufacturing exactly the number of products which is currently demanded on the market. The article describes an example of a production task performed in the cellular structure. The customer required a substantial and abrupt increase (by 65%) of the production task. In order to tackle the problem, logistics engineering and lean manufacturing methods were applied. Having regard to the Industry 4.0 perspective, a concept of automated work cells was presented in order to minimise the role of the operator.

Źródło:

Logistics and Transport; 2018, 39, 3; 47-52
1734-2015

Pojawia się w:

Logistics and Transport

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 31.

Tytuł:

Development software for study the wood drying chamber by using a three-dimensional mathematical model based on cellular automata

Autorzy:

Sokolovskyy, Yaroslav
Sinkevych, Oleksiy
Volianskyi, Roman
Kapran, Ihor

Powiązania:

https://bibliotekanauki.pl/chapters/32304194.pdf

Data publikacji:

2021

Wydawca:

Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej

Tematy:

wood drying chamber.
CAD model
cellular automata

Opis:

The paper describes the study of the drying processes of capillary-porous materials by using the CAD model of wood drying chamber. The study involves the determination of temperature and humidity in the stack of dried wood by using cellular automata. To accomplish this task, we developed a three-dimensional mathematical model of heat transfer of wood in the drying process. In order to use this mathematical model in practice, we described the ways of representing the CAD model in the form of multidimensional arrays whose elements are 3D cubes, as well as special schemes of the relation between the edges of these 3D cubes. This representation allows us to make the most effective use of the developed mathematical model, which is described by an interconnected system of partial differential equations in time derivatives and spatial coordinates. Also in this paper, the results of the calculations in the form of graphs of change in the temperature and humidity of the stack of dried wood according to time iterations are shown. In order to take simpler results, we developed a radial basis artificial neural network.

Źródło:

Methods and tools in CAD – selected issues; 133-144
9788366391871

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 32.

Tytuł:

Genotoxic effects of 60Co gamma-rays on Chinese hamster ovary (CHO) cells

Autorzy:

Dicu, T.
Brie, I.
Virag, P.
Fischer, E.
Perde, M.
Foriş, V.
Cernea, V.
Cosma, C.

Powiązania:

https://bibliotekanauki.pl/articles/147740.pdf

Data publikacji:

2008

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

cellular radiosensitivity
genotoxic effects
ionizing radiation
comet assay

Opis:

The aim of the present study was to evaluate the cellular radiosensitivity and radiation-induced DNA damage and repair in Chinese hamster ovary (CHO) cells. Cell survival after irradiation was assessed using the clonogenic assay. The initial, radio-induced and residual DNA damage in Chinese hamster ovary (CHO) cells exposed to 60Co gamma-rays were determined using the alkaline comet assay. A linear-quadratic (LQ) survival curve was observed in CHO line. Data obtained by comet assay demonstrated a linear dose-response correlation in the range of tested doses (0.3-4 Gy). The process of DNA repair was modeled by exponential equation. In addition, we found a good correlation (R2 = 0.995) between clonogenic cell survival and radio-induced DNA damage.

Źródło:

Nukleonika; 2008, 53, 4; 161-165
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 33.

Tytuł:

Oprogramowanie CrowdSim do modelowania dynamiki pieszych
CrowdSim – Pedestrian Dynamics Modeling Software

Autorzy:

Dobrowolski, M.
Maciak, T.

Powiązania:

https://bibliotekanauki.pl/articles/373081.pdf

Data publikacji:

2018

Wydawca:

Centrum Naukowo-Badawcze Ochrony Przeciwpożarowej im. Józefa Tuliszkowskiego

Tematy:

ewakuacja
modelowanie
automat komórkowy
evacuation
modelling
cellular automata

Opis:

Cel: Celem artykułu jest zaprezentowanie autorskiego oprogramowania CrowdSim służącego do modelowania dynamiki pieszych. W oprogramowaniu zaimplementowano algorytmy bazujące na dwuwymiarowym modelu automatu komórkowego Cellular Automata(CA). Uwzględniono w nich strategiczne możliwości pieszych dotyczące wyboru wyjścia (model CA-A) oraz możliwości powstawania zakłóceń płynności ruchu i blokad (model CA-B). Zaimplementowanie różnych pod względem złożoności modeli dało możliwości porównania ich efektywności, funkcjonowania oraz stopnia realizmu otrzymywanych wyników. Projekty i metody: W celu lepszego i bardziej wiarygodnego wyznaczania ścieżek poruszania się pieszych zaproponowano dwie modyfikacje usprawniające działanie algorytmów symulacyjnych. Pierwszą z nich było wprowadzenie zaawansowanych algorytmów rankingujących komórki: SRA (Simple Ranking Algorithm), BFS-RA (Breadth First Search Ranking Algorithm) i ARA (Advanced Ranking Algorithm). Wartość rankingu danej komórki w procesie symulacji jest dla każdego z aktorów wyznacznikiem drogi, po której się porusza. Kolejnym autorskim usprawnieniem było wprowadzenie do definicji automatu komórkowego pojęcia pamięci aktora, dzięki czemu piesi podczas symulacji, pamiętając swoje ostatnie ruchy, poruszają się bardziej płynnie i realistycznie. Wyniki: Na potrzeby porównania modeli przygotowana została specjalna mapa budynku o wymiarach kontygnacji 40 na 22,5 metra (900 m2 ) zdolnego pomieścić maksymalnie 3000 osób. Przeprowadzone symulacje wykazały, że w przypadku modelu CA aktorzy gromadzą się przy jednym z wyjść, podczas gdy pozostałe zostają w większości nieużywane. Wynika to z faktu, że w modelu CA brakuje funkcji kosztu, zatem aktor zawsze wybiera wyj-ście najbliższe. Inaczej sprawa ma się w przypadku modelu CA-A. Tu aktorzy w miarę równo obciążają każde z wyjść; są oni w stanie podjąć decyzje odnośnie do wyboru wyjścia nie tylko na podstawie odległości, ale również zagęszczenia osób przy danym wyjściu. W przypadku porównania modeli CA-A i CA-B praktycznie niezauważalne są różnice w otrzymanych statystykach obciążenia wyjść. Dopiero po bliższym przyjrzeniu się ruchowi aktorów podczas symulacji widać, że jeśli w przypadku czystego modelu CA-A ludzie poruszają według idealnego porządku, o tyle w modelu CA-B zauważalne są chwilowe blokady i zakleszczenia aktorów.Wnioski: Stworzone i zaprezentowane w niniejszej pracy oprogramowanie CrowdSim może posłużyć zarówno projektantom, architektom lub konstruktorom, jak i służbom porządkowym, ochronie danego obiektu lub organizatorom imprez masowych. Symulacje wykonane wielokrotnie dla jednego scenariusza przy różnych parametrach wejściowych uwidoczniają problemy i wąskie gardła mogące pojawić się w trakcie ewakuacji z zagrożonego obiektu. Przeprowadzanie takich symulacji na etapie projektowym może bardzo pozytywnie wpłynąć na bezpieczeństwo osób użytkujących dany obiekt, jak również poprawić jego funkcjonalność.
Aim: Phe aim of the article is to present CrowdSim, proprietary software for modeling the dynamics of pedestrians. The software offers algorithms based on a 2-dimensional model of aCellular Automaton (CA). They include strategic pedestrian choices of the exit (CA-A model) and the formation of blockages (Model CA-B). Implementation of various models in terms of their complexity provided the opportunity to compare their efficiency, functioning and realism of the results obtained.Project and methods: In order to better and more credibly determine pedestrian paths, two modifications were proposed to improve the operation of simulation algorithms. The first of these was the introduction of advanced algorithms ranking cells: SRA (Simple Ranking Algorithm), BFS-RA (Breadth First Search Ranking Algorithm) and ARA (Advanced Ranking Algorithm). The value of the ranking of a given cell in the simulation process is for each BITP VOL. 52 ISSUE 4, 2018, pp. 46–66, https://dx.doi.org/10.12845/bitp.52.4.2018.3SAFETY & FIRE TECHNIQUERESEARCH AND DEVELOPMENT47of the actors the determinant of the path on which it moves. Another proprietary improvement was the introduction of the concept of actor's memory to the definition of a cellular automata, thanks to which pedestrians, while remembering their last movements, move more smoothly and realistically.Results: For the purposes of model comparison, a special map of the building with the dimensions of 40 to 22.5 meters (900 m2) has been prepared, able to accommodate a maximum of 3000 people. The simulations showed that in the case of the CA model, the actors gather at one of the outputs while the others are mostly unused. This is due to the fact that the CA model lacks the cost function, so the actor always chooses the nearest output. Things are different in the case of the CA-A model. Here, the actors equally burden each exit, they are able to make decisions regarding the choice of the exit not only on the basis of the distance but also the concentration of actors at the given exit. When comparing the CA-A and CA-B models, there are practically no differences in the received output load statistics. Only after a closer look at the movement of the actors during the simulation can be seen that if in the case of a clean CA-A model people move according to the ideal order, in the CA-B model there are momentary blockages and deadlocks of actors.Conclusions: CrowdSim software created and presented in this work can be used by designers, architects or constructors as well as law enforcement, protection of a given facility or organizers of mass events. Simulations made repeatedly for one scenario with different input parameters reveal problems and bottlenecks that may appear during evacuation from an object at risk. Conducting such simulations at the design stage can have a very positive impact on the safety of people using a given facility, as well as improve its functionality.

Źródło:

Bezpieczeństwo i Technika Pożarnicza; 2018, 52, 4; 46-66
1895-8443

Pojawia się w:

Bezpieczeństwo i Technika Pożarnicza

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 34.

Tytuł:

Simulating the spread of the BSE disease: a cellular automata approach

Autorzy:

Magdoń-Maksymowicz, M.
Maksymowicz, A. Z.

Powiązania:

https://bibliotekanauki.pl/articles/1964173.pdf

Data publikacji:

2005

Wydawca:

Politechnika Gdańska

Tematy:

computer simulation
disease spreading
BSE
cellular automata method

Opis:

The rules of evolution applied in the cellular automata approach may correspond to the propagation of the mad cow disease. In a computer simulation of the BSE disease's spread both inherited and infectious mechanisms are accounted for. The initial population of items is randomly distributed on a two-dimensional square lattice, Nx × Ny = 1000 × 1000, with a fraction of 1 percent the items already infected. Alternatively, faulty prions may spontaneously develop during the simulation with a very small frequency. Our results indicate a critical probability, pc, of BSE transmission, so that for p below the threshold the population recovers. For p > pc the disease is launched in the population with a dynamic equilibrium between the healthy and infected fractions of the population. The threshold is very sensitive to spatial clustering of the population and the detailed rules for the disease's onset, evolution and propagation.

Źródło:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2005, 9, 2; 179-185
1428-6394

Pojawia się w:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 35.

Tytuł:

Simulations of flow patterns in silos with a cellular automaton: Part 1

Autorzy:

Kozicki, J.
Tejchman, J.

Powiązania:

https://bibliotekanauki.pl/articles/1965146.pdf

Data publikacji:

2005

Wydawca:

Politechnika Gdańska

Tematy:

cellular automation
granular flow
flow pattern
insert
silo

Opis:

A simplified cellular automaton was used to calculate the kinematics of non-cohesive granular materials during confined flow in silos. In this model, granular flow was assumed to be an upward propagation of holes through a lattice composed of cells representing single particles. Calculations were carried out with different silo shapes and inserts, transition probabilities, migration rules, outflow schemes, grid types, wall roughness and cell numbers. To visualize the calculation process, horizontal layers of various shades were introduced. The simulation results were compared with laboratory tests in model silos.

Źródło:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2005, 9, 1; 81-102
1428-6394

Pojawia się w:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 36.

Tytuł:

Research on the influence of blowing agent on selected properties of extruded cellular products

Autorzy:

Garbacz, T.
Jachowicz, T.
Gajdoš, I.
Kijewski, G

Powiązania:

https://bibliotekanauki.pl/articles/102154.pdf

Data publikacji:

2015

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

thermoplastics polymers
cellular extrusion
blowing agents
mechanical properties

Opis:

As a part of a more comprehensive research project, the present study was undertaken to investigate the effect of the type and content of blowing agents in the polymeric materials being processed on the structure and selected physical and mechanical properties of the obtained extrusion parts. In the experiment, the content of the blowing agent (0–2.0% by mass), fed into the processed polymer were adopted as a variable factor. In the studies presented in the article, the blowing agents of endothermic decomposition characteristics (Hydrocerol BIH 70, Hydrocerol BM 70) and the exothermic decomposition characteristics (PLC 751) occurring in the granulated form with a diameter of 1.2 to 1.8 mm were used. Based on the results of investigating porosity, porous structure image analysis as well as microscopic examination of the structure, it has been found that the favorable content of the blowing agent in the polymeric material should be of up to 0.8% by mass. With such a content of the blowing agent in the polymeric material, favorable strength properties are retained in porous parts, the pore distribution is uniform and the pores have similar sizes.

Źródło:

Advances in Science and Technology. Research Journal; 2015, 9, 28; 81-88
2299-8624

Pojawia się w:

Advances in Science and Technology. Research Journal

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 37.

Tytuł:

Fatigue Properties of Polyurethane Foams, with Special Emphasis on Auxetic Foams, Used for Helicopter Pilot Seat Cushion Inserts

Autorzy:

Lisiecki, J.
Nowakowski, D.
Reymer, P.

Powiązania:

https://bibliotekanauki.pl/articles/97996.pdf

Data publikacji:

2014

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Lotnictwa

Tematy:

cellular plastics
fatigue properties investigations
helicopter pilot seats

Opis:

Seat cushion inserts in military helicopters crew seats, as suggested by the helicopters manufacturers, are made of traditional polyurethane foams. Elastic polyurethane auxetic foams are materials that exhibit different utility properties compared to traditionally used polyurethane foams, such as polyether or polystyrene foams. All the differences result from the primary physical property of elastic polyurethane auxetic foams which is a negative Poisson’s ratio. Auxetic materials are characterized by better utility properties than conventional foam materials – they can potentially increase safety in the event of a crash and offer higher comfort during regular use. Application of auxetic materials as seat cushion inserts would also decrease harmful health effects of vibrations. This paper presents the results of the fatigue tests carried out on different foam samples by pressing an indenter into the foams' surface that was much larger than the indenter’s surface. A maximum value of the load used during the test was within a defined range in every fatigue cycle. In order to test 150x150x50 mm foam samples a special indenter was designed and manufactured according to the PN-EN ISO 3385 and PN-EN ISO 2439 standards. The indenter’s dimensions were consistent with the standards in relation to the tested foams' size. The fatigue tests of both conventional and auxetic foams were carried out according to the above given standards by applying 80,000 load cycles at 70 cycle/min frequency. Tests of viscoelastic foam and multilayer foam specimens, for which the upper layer was made of viscoelastic foam, were carried out according to the ASTM D 3574 standard applying 12 ,000 load cycles at 10 cycle/min frequency. All the tests were carried out using the MTS 370.10 strength testing machine. Changes in thickness and density were determined throughout the tests. Moreover, the influence of the volumetric compression ratio on the fatigue properties of auxetic foam samples and the dependence of foam deflection on the number of cycles were examined. Finally, the test results obtained for conventional and auxetic foams were compared and discussed.

Źródło:

Fatigue of Aircraft Structures; 2014, 6; 72-78
2081-7738
2300-7591

Pojawia się w:

Fatigue of Aircraft Structures

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 38.

Tytuł:

Capturing local material heterogeneities in numerical modelling of microstructure evolution

Autorzy:

Madej, Lukasz
Sitko, Mateusz
Fular, Aleksander
Sarzyn, Rafal
Werminski, Mariusz
Perzynski, Konrad

Powiązania:

https://bibliotekanauki.pl/articles/2052206.pdf

Data publikacji:

2021

Wydawca:

Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych

Tematy:

microstructure
cellular automata
finite element method
spring algorithm

Opis:

The work focuses on developing the complex digital shadow of the metallic material microstructure that can predict its evolution during metal forming operations. Therefore, such a digital shadow has to consider all major physical mechanisms influencing the particular investigated phenomenon. The motivation for the work is directly related to the development of modern metallic materials, often of multiphase nature. Such microstructure types lead to local heterogeneities influencing material behaviour and eventually macroscopic properties of the final product. The concept of the digital material shadow, stages of the model development, and examples of practical applications to simulation of microstructure evolution are presented within the work. Capturing local heterogeneities that have a physical origin and eliminating numerical artefacts is particularly addressed. Obtained results demonstrate the capabilities of such a digital microstructure shadow approach in the numerical design of final product properties.

Źródło:

Journal of Machine Engineering; 2021, 21, 4; 29-48
1895-7595
2391-8071

Pojawia się w:

Journal of Machine Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 39.

Tytuł:

Zastosowanie automatów komórkowych w modelowaniu konfliktów przestrzennych na przykładzie modelowania epidemii
Application of cellular automata in modeling of spatial conflicts in the example of epidemia modeling

Autorzy:

Stachura-Terlecka, B.
Ligęza, A.

Powiązania:

https://bibliotekanauki.pl/articles/324268.pdf

Data publikacji:

2018

Wydawca:

Politechnika Śląska. Wydawnictwo Politechniki Śląskiej

Tematy:

modeling of epidemics
Cellular Automata
Layered Competitive Cellular Automata
modeling spatial conflicts
modelowanie epidemii
automaty komórkowe
modelowanie konfliktów przestrzennych

Opis:

This article presents a different approach to epidemics modeling. For the purpose of this modeling, an outbreak as well as its prevention methods are considered as a special kind of spatial conflict. A new type of cellular automata - Layered Competitive Cellular Automata (LCCA) - were used to model it. Thanks to using the LCCA one can not only model the result of the conflict, but above all its development, while the possibility of adding various physical phenomena and their influence on the conflict makes the results even more realistic. The results of the conflict modeling are presented on a map, which allows to observe and analyze them at different stages of modeling. This approach meets the requirements of modeling algorithms
W artykule zaprezentowano inne podejście do modelowania epidemii. Epidemia i metody jej przeciwdziałania na potrzeby tego modelowania traktowana jest jako specjalny rodzaj konfliktu przestrzennego. Do jej modelowania użyto nowego typu automatów komórkowych – Layered Competitive Cellular Automata. Zastosowanie LCCA umożliwia nie tylko modelowanie samego wyniku konfliktu, ale przede wszystkim jego przebiegu, zaś możliwość dodania wpływu zjawisk fizycznych na poszczególne strony konfliktu urealnia wyniki. Wyniki modelowania zaprezentowane są na mapie dzięki czemu można obserwować je na poszczególnych etapach modelowania. Takie podejście wychodzi na przeciw wymaganiom stawianym algorytmom modelowania.

Źródło:

Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska; 2018, 130; 567-574
1641-3466

Pojawia się w:

Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 40.

Tytuł:

The role of neighborhood density in the random cellular automata model of grain growth

Autorzy:

Czarnecki, Michał
Sitko, Mateusz
Madej, Łukasz

Powiązania:

https://bibliotekanauki.pl/articles/29520228.pdf

Data publikacji:

2021

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH

Tematy:

random cellular automata
grain growth
digital material representation

Opis:

The paper focuses on adapting the random cellular automata (RCA) method concept for the unconstrained grain growth simulation providing digital microstructure morphologies for subsequent multi-scale simulations. First, algorithms for the generation of initial RCA cells alignment are developed, and then the influence of cells density in the computational domain on grain growth is discussed. Three different approaches are proposed based on the regular, hexagonal, and random cells’ alignment in the former case. The importance of cellular automata (CA) cell neighborhood definition on grain growth model predictions is also highlighted. As a research outcome, random cellular automata model parameters that can replicate grain growth without artifacts are presented. It is identified that the acceptable microstructure morphology of the solid material is obtained when a mean number of RCA cells in the investigated neighborhood is higher than ten.

Źródło:

Computer Methods in Materials Science; 2021, 21, 3; 129-137
2720-4081
2720-3948

Pojawia się w:

Computer Methods in Materials Science

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 41.

Tytuł:

On the semantic security of cellular automata based pseudo-random permutation using results from the Luby-Rackoff construction

Autorzy:

Faraoun, K. M.

Powiązania:

https://bibliotekanauki.pl/articles/106204.pdf

Data publikacji:

2015

Wydawca:

Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej

Tematy:

semantic security
reversible cellular automata
block ciphers
cryptography

Opis:

This paper proposes a semantically secure construction of pseudo-random permutations using second-order reversible cellular automata. We show that the proposed construction is equivalent to the Luby- Racko model if it is built using non-uniform transition rules, and we prove that the construction is strongly secure if an adequate number of iterations is performed. Moreover, a corresponding symmetric block cipher is constructed and analysed experimentally in comparison with popular ciphers. Obtained results approve robustness and ecacy of the construction, while achieved performances overcome those of some existing block ciphers.

Źródło:

Annales Universitatis Mariae Curie-Skłodowska. Sectio AI, Informatica; 2015, 15, 1; 21-31
1732-1360
2083-3628

Pojawia się w:

Annales Universitatis Mariae Curie-Skłodowska. Sectio AI, Informatica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 42.

Tytuł:

Image reconstruction with the use of evolutionary algorithms and cellular automata

Autorzy:

Seredyński, F.
Skaruz, J.
Piraszewski, A.

Powiązania:

https://bibliotekanauki.pl/articles/106216.pdf

Data publikacji:

2012

Wydawca:

Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej

Tematy:

image reconstruction
evolution algorithms
cellular automata
genetic algorithm

Opis:

In the paper we present a new approach to the image reconstruction problem based on evolution algorithms and cellular automata. Two-dimensional, nine state cellular automata with the Moore neighbourhood perform reconstruction of an image presenting a human face. Large space of automata rules is searched through efficiently by the genetic algorithm (GA), which finds a good quality rule. The experimental results show that the obtained rule allows to reconstruct an image with even 70% damaged pixels. Moreover, we show that the rule found in the genetic evolution process can be applied to the reconstruction of images of the same class but not presented during the evolutionary one.

Źródło:

Annales Universitatis Mariae Curie-Skłodowska. Sectio AI, Informatica; 2012, 12, 4; 39-49
1732-1360
2083-3628

Pojawia się w:

Annales Universitatis Mariae Curie-Skłodowska. Sectio AI, Informatica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 43.

Tytuł:

Multifunctional role of plant cysteine proteinases

Autorzy:

Grudkowska, Małgorzata
Zagdańska, Barbara

Powiązania:

https://bibliotekanauki.pl/articles/1041536.pdf

Data publikacji:

2004

Wydawca:

Polskie Towarzystwo Biochemiczne

Tematy:

cysteine proteinases
gene expression
cellular functions
localisation
inhibitors

Opis:

Cysteine proteinases also referred to as thiol proteases play an essential role in plant growth and development but also in senescence and programmed cell death, in accumulation of storage proteins such as in seeds, but also in storage protein mobilization. Thus, they participate in both anabolic and catabolic processes. In addition, they are involved in signalling pathways and in the response to biotic and abiotic stresses. In this review an attempt was undertaken to illustrate these multiple roles of cysteine proteinases and the mechanisms underlying their action.

Źródło:

Acta Biochimica Polonica; 2004, 51, 3; 609-624
0001-527X

Pojawia się w:

Acta Biochimica Polonica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 44.

Tytuł:

Grain Size Dependence of Creep Lifetime Modeled by Means of Cellular Automata

Autorzy:

Nowak, K.

Powiązania:

https://bibliotekanauki.pl/articles/386257.pdf

Data publikacji:

2011

Wydawca:

Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej

Tematy:

automaty komórkowe
pełzanie
zależność
cellular automata
creep
dependence

Opis:

Grain size dependence of creep is a complex relation. It can be increasing, decreasing or constant function accordingly to current conditions and material. It is a consequence of complex nature of microscopic mechanisms affecting creep. Some of them are analyzed in current paper by means of multiscale model, using simulation of damage development done by cellular automata technique. It was shown that enlarged sizes of grains, which promote development of intergranular microcracks, are compensated by reduced density of voids forming vacancies. Obtained in simulations grain size dependency follows experimentally observed dependency for small grains in dislocation creep range.

Źródło:

Acta Mechanica et Automatica; 2011, 5, 4; 81-85
1898-4088
2300-5319

Pojawia się w:

Acta Mechanica et Automatica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 45.

Tytuł:

Serosurvey and Cellular Immune Status of HTLV-1/2 and HIV Co-infections in Bauchi State, Nigeria

Autorzy:

Babayo, Adamu
Azeez, Akande Oyebanji
Sabo, Yusuf Mohammed
Abdullahi, Idris Nasir
Dangana, Amos

Powiązania:

https://bibliotekanauki.pl/articles/454797.pdf

Data publikacji:

2019

Wydawca:

Uniwersytet Rzeszowski. Wydawnictwo Uniwersytetu Rzeszowskiego

Tematy:

HTLV
cellular Immunity
HIV co-infections
antiretroviral therapy

Opis:

Introduction. Human T-cell lymphotropic virus types 1 and 2 (HTLV-1 & 2) are frequent co-pathogens among immunosuppressed individuals, particularly HIV/AIDS infected persons. Dual infected persons usually present with false normal or high CD4+ T cells count as a result of the ability of HTLV to induce clonal proliferation of CD4+ T lymphocytes. There is paucity of information on this clinical entity in Nigeria. Aim. This study aimed to determine the seroprevalence of HTLV-1/2 and associated cellular immune response among antiretroviral naïve and experienced HIV infected persons at Bauchi State, Nigeria. Material and methods. One hundred and eighty two (182) HIV seropositive patients’ blood samples were analyzed for anti HTLV-1/2 IgM and IgG antibodies using ELISA while CD4+ T cells were counted using Flow cytometry technique. Socio-demographic data of the subjects and clinical history were obtained via questionnaire and medical records, respectively. Results. The seroprevalence of anti-HTLV-1/2 was 14%. This comprised 76 (41.8%) males and 106 (58.2%) females. Six (3%) were seropositive for both ant-HTLV -1&2 IgM and IgG. Of the total positive for anti-HTLV-1/2, 20 (25%) ART-naïve and 6(5.9%) ART-experience subjects. Whole blood CD4+ T cell count was significantly high in HTLV-1/-2 IgG/IgM seropositive subjects compared to their HTLV-1/-2 negative counterpart. Conclusion. All subjects (100%) who were HTLV-1/-2/HIV co-infected had normal to higher CD4+ T cell counts. It is suggested to be very careful in using only CD4+ counts to monitor HIV progression or as indicators for ART.

Źródło:

European Journal of Clinical and Experimental Medicine; 2019, 4; 28-294
2544-2406
2544-1361

Pojawia się w:

European Journal of Clinical and Experimental Medicine

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 46.

Tytuł:

Modeling of the Kinetics of Carbonitrides Precipitation Process and Simulate the Image of Microstructure Using Cellular Automata Method in Microalloyed Steels

Autorzy:

Marynowski, Przemysław
Hojny, Marcin

Powiązania:

https://bibliotekanauki.pl/articles/2134114.pdf

Data publikacji:

2022

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

cellular automata
precipitation
carbonitrides
microalloying elements
microalloyed steel

Opis:

Microalloying elements such as Ti, Nb, V, entered into steel they influence their microstructure and mechanical properties, because formation of carbonitrides, M(C, N). Influence of carbonitrides to the microstructure and mechanical properties depends on their basic stereological parameters: volume fraction, Vv, and their size, r. In this work the Cellular Automata model of the kinetics of the carbonitrides precipitation which enable to predict the image of the microstructure and calculate the size of carbonitrides formed during isothermal annealing of supersaturated steel is presented. In the high temperature the microalloying elements inhibit the austenite grains growth. Chemical composition of steel has influence to volume fraction and size of precipitations. The work is supplemented with examples of experimental comparison.

Źródło:

Archives of Metallurgy and Materials; 2022, 67, 3; 1117--1124
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 47.

Tytuł:

Symulacja obniżeń górotworu spowodowana wielokrotną eksploatacją górniczą z wykorzystaniem teorii automatów komórkowych
Simulation of rockmass subsidence caused by frequent mining exploitation with the use of cellular automaton theory

Autorzy:

Mielimąka, R.
Sikora, P.

Powiązania:

https://bibliotekanauki.pl/articles/167133.pdf

Data publikacji:

2017

Wydawca:

Stowarzyszenie Inżynierów i Techników Górnictwa

Tematy:

obniżenia
górotwór
automat komórkowy
subsidence
rock mass
Cellular Automaton

Opis:

W pracy przedstawiono przykład rzeczywistej wielokrotnej eksploatacji pokładowej węgla kamiennego, która spowodowała powstanie na powierzchni terenu górniczego niecki obniżeniowej. Deformacje powierzchni objęte były systematycznymi pomiarami niwelacyjnymi wzdłuż linii pomiarowej „H”. Dla przedstawionego przykładu podziemnej eksploatacji wykonano obliczenia numeryczne z wykorzystaniem teorii automatów komórkowych, a następnie porównano je z wynikami obserwacji geodezyjnych. Celem artykułu była weryfikacja założeń teoretycznych modelu i wykazanie praktycznych możliwości zastosowania przedmiotowej metody do oceny deformacji terenu górniczego.
This paper presents an example of real multiple hard coal mining which caused the formation of a subsidence trough on the surface of the mining area. Surface deformations were covered by systematic leveling measurements along the measurement line “H”. For the illustrated example of underground mining, numerical calculations were made using the theory of cellular automata, and then compared with the results of geodetic observations. The aim of the paper was to verify the theoretical assumptions of the model and to demonstrate the practical possibilities of applying this method to assess the deformation of the mining area.

Źródło:

Przegląd Górniczy; 2017, 73, 12; 84-92
0033-216X

Pojawia się w:

Przegląd Górniczy

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 48.

Tytuł:

Application of a cellular automata model to granular flow

Autorzy:

Kozicki, J.
Tejchman, J.

Powiązania:

https://bibliotekanauki.pl/articles/1986936.pdf

Data publikacji:

2002

Wydawca:

Politechnika Gdańska

Tematy:

cellular automata
granular flow
silo
passive state
active state

Opis:

Paper presents the results of simulations of granular flow with a cellular automata model. Flow of granular material behind a moving retaining wall and in a silo with inserts was numerically analysed. Two different migration schemes during flow were assumed. Advantages and limits of the model were outlined.

Źródło:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2002, 6, 3; 429-436
1428-6394

Pojawia się w:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 49.

Tytuł:

Queuing models for cellular networks with generalised Erlang service distributions

Autorzy:

Jayasuriya, A.

Powiązania:

https://bibliotekanauki.pl/articles/307731.pdf

Data publikacji:

2003

Wydawca:

Instytut Łączności - Państwowy Instytut Badawczy

Tematy:

sieci komórkowe
cellular networks
phase type distributions
generalised Erlang

Opis:

Providing seamless handover is one of the major problems in mobile communication environments. Careful dimensioning of the network and the underlying teletraffic analysis plays a major role in determining the various grade of services (GoSs) that can be provided at various network loads for handover users. It has been shown that the channel holding time of a cell, one of the important parameters in any teletraffic analysis, can be accurately modelled by Erlang distributions. This paper focuses on solving queuing systems with generalised Erlang service distributions and exponential arrival distributions. We present the quasi-birth-death (QBD) process, which characterises the queuing models with generalised Erlang service and exponential interarrival distributions. We then use the properties of Erlang distributions and characteristics of channel allocation process of cellular networks to simplify the queues used to model cellular networks. The use of these simplifications provide a significant reduction in computation time required to solve these QBDs.

Źródło:

Journal of Telecommunications and Information Technology; 2003, 2; 55-61
1509-4553
1899-8852

Pojawia się w:

Journal of Telecommunications and Information Technology

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 50.

Tytuł:

Grafowy automat komórkowy o zmiennych sąsiedztwach relacyjnych komórek - założenia dla implementacji w FPGA
Graph Cellular Automaton with Dynamic Relation Based Neighborhoods of Cells - Introduction for FPGA Implementation

Autorzy:

Hołowiński, G.
Małecki, K.

Powiązania:

https://bibliotekanauki.pl/articles/155113.pdf

Data publikacji:

2011

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

automaty komórkowe
niehomogeniczny automat komórkowy
dynamiczne sąsiedztwo relacyjne
modelowanie systemów złożonych
cellular automation
cellular automata
dynamic relationship
modeling of complex systems

Opis:

Artykuł prezentuje nowy automat komórkowy r-sdgCA, który pozwala na modelowanie procesów zachodzących w układach o zmiennej w czasie liczbie obiektów i relacjach pomiędzy nimi. To nowe podejście pozwala na modelowanie zjawisk zachodzących w sieciach komputerowych, modelach ruchu pojazdów i interakcjach między nimi, serwisach społecznościowych, itp. Artykuł przedstawia definicję r-sdgCA i nową, charakterystyczną dla niego własność - dynamiczne sąsiedztwo relacyjne oraz omawia założenia do implementacji r-sdgCA w FPGA.
Applications of cellular automata (CA) to modelling allow recognizing of complex systems with simple mechanisms [1, 2]. Use of regular, constant in time, grid of cells is the limitations of CA. It causes the set of neighbours is constant. There were provided results of researches that somehow allow omitting this limitation - for example structurally dynamic CA [3,4], CA with irregular neighbourhood or graph related neighbourhood [5, 6, 7]. In this paper there is proposed a new cellular automaton called r-sdgCA. Its unique feature is a reconfigurable structure of active cells in the grid and dynamic relation-based neighbourhoods of cells. The reconfigurable G graph - that can reconfigure its sets of vertices and directed weighted edges - is used to define the dynamic relation based neighbourhoods of cells in r-sdgCA and corresponding dynamic structure of active and inactive cells in the grid. Figure 2 shows example of objects and corresponding relations mapping to cells of r-sdgCA. The second part of paper focuses on possible areas of implementation of this new automaton and some basic assumptions about implementation or r-sdgCA in FPGA. Functional steps of process modelling using r-sdgCA and general scheme of r-sdgCA is shown at Fig. 3. The proposed r-sdgCA can be used to modelling processes in systems of dynamic number of objects (and relations among them). This new approach help understanding of wide range of processes that work both in real life and artificial systems.

Źródło:

Pomiary Automatyka Kontrola; 2011, R. 57, nr 8, 8; 861-863
0032-4140

Pojawia się w:

Pomiary Automatyka Kontrola

Dostawca treści:

Biblioteka Nauki

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