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Tytuł:
Rotor blade vibration simulator of steam turbine with aliasing frequencies up to 25 Hz
Autorzy:
Piechowski, L.
Rządkowski, R.
Troka, P.
Piechowski, P.
Szczepanik, R.
Powiązania:
https://bibliotekanauki.pl/articles/175409.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
tip-timing
rotor blade vibration
blade vibration simulator
Opis:
The tip-timing measurement of rotor blade vibration of a real turbine is very expensive. An electronic simulator of unshrouded steam turbine rotor blade vibrations for aliasing frequencies up to 25 Hz is presented in this paper. The results of the simulated blade vibrations were compared with ones carried out on a real steam turbine. The simulator can be also used to: calibrate the measurement channels, help in the designing and manufacturing new tip-timing systems, and check the reliability of other tip-timing systems.
Źródło:
Transactions of the Institute of Fluid-Flow Machinery; 2016, 134; 121-129
0079-3205
Pojawia się w:
Transactions of the Institute of Fluid-Flow Machinery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Aerodynamic enhancement in inner channel of turbine blade
Autorzy:
Kaczyński, P.
Szwaba, R.
Puchowski, B.
Doerffer, P.
Flaszyński, P.
Powiązania:
https://bibliotekanauki.pl/articles/1938640.pdf
Data publikacji:
2015
Wydawca:
Politechnika Gdańska
Tematy:
turbine blade
internal channel
radial passage
blade cooling
Opis:
This paper presents the numerical and experimental study of the flow structure in a radial cooling passage model of a gas turbine blade. The investigations focus on the flow aerodynamics in the channel, which is an accurate representation of the configuration used in aero engines. The flow structure and pressure drop were measured by classical measurement techniques. The stagnation pressure and velocity measurements in a channel outlet plane were performed. The investigations concerning the flow field and heat transfer used in the design of radial cooling passages are often developed from simplified models. It is important to note that real engine passages do not have perfect rectangular cross sections, but include corner fillets, ribs with fillet radii and special orientation. Therefore, this work provides detailed fluid flow data for a model of radial cooling geometry which possesses very realistic features. The main purpose of these investigations was to study different channel configurations and their influence on the flow structure and pressure losses in a radial cooling passage of a gas turbine blade.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2015, 19, 2; 101-110
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic analysis of the control stage of a high speed steam turbine
Autorzy:
Sławiński, D.
Zakrzewski, W.
Powiązania:
https://bibliotekanauki.pl/articles/175498.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
control stage
residual stresses
initial displacement blade
vibrations blade
Opis:
This paper analyzes the possibility of resonances within a control stage of a high speed turbine. An original method for steady state operation is used for the analysis of the stiffness matrix representing: initial displacement blade (nominal shape blade obtained by nominal working point of turbine) and residual stresses following local crossing yield plastic strain. In the analysis there has been found a possibility of occurance of the resonance frequency, and mistuning by showing the safe working ranges. The calculation used the 3D modal and harmonic analysis within computational solid dynamics (CSD) and the results were compared with the 0D data from literature. After local crossing of yields stresses, on the basis of the harmonic analysis, there has been shown operation of the blade in the resonance point. Before crossing the yield stresses the blade is working in mistuning and a safe point.
Źródło:
Transactions of the Institute of Fluid-Flow Machinery; 2012, 124; 41-49
0079-3205
Pojawia się w:
Transactions of the Institute of Fluid-Flow Machinery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
What to divide leaves into ten parts for? The proposition of shape indices of leaf blade
Autorzy:
Meissner, W
Zolkos, K.
Powiązania:
https://bibliotekanauki.pl/articles/41355.pdf
Data publikacji:
2008
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
leaf blade
roundness index
asymmetry index
leaf blade measurement
statistical method
Opis:
In this paper the method of creating indices for description leaf blade roundness and asymmetry, based on division of the leaf into 10 equal parts perpendicularly to the long axis was proposed. Along each division line the distance between the midrib and the leaf edge was measured separately for the left and right site of the blade. Sum of all 18 measurements, 9 on each side, may be treated as an index of the roundness of the leaf blade. Differences between sums of all measurements of the left and right leaf site could be a base for calculations of various asymmetry indices, including indicators of fluctuating asymmetry. Indices obtained by this method are quite sensitive and may be analysed using standard statistical methods.
Źródło:
Dendrobiology; 2008, 60; 29-33
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Power and thrust coefficients of the horizontal axis tidal stream turbine with different twist angles, blade numbers, and section profiles
Autorzy:
Abbasi, Alireza
Ghassemi, Hassan
Molyneux, David
Powiązania:
https://bibliotekanauki.pl/articles/135026.pdf
Data publikacji:
2019
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
HATST
twist angle
blade profile
blade number
power coefficient
thrust coefficients
Opis:
The purpose of this research was to investigate the power and thrust coefficients of a horizontal axis tidal stream turbine (HATST) with different blade geometries, including twist angles, blade numbers, and section profiles. The RANS equations and Star-CCM+ commercial software were used to numerically analyze these variables. Furthermore, the turbulence model used in this study is a Realisable k-ε turbulent model. Nine different models were defined by changing the twist angle, thickness, camber, and blade numbers. The results are presented, and the power and thrust coefficients are compared against TSR for each of the nine different models. The pressure distribution and flow velocity contour are also presented and discussed.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2019, 57 (129); 11-20
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Natural frequencies of tuned and mistuned bladed discs on a shaft
Autorzy:
Rządkowski, R.
Drewczyński, M.
Kubitz, L.
Powiązania:
https://bibliotekanauki.pl/articles/1955332.pdf
Data publikacji:
2006
Wydawca:
Politechnika Gdańska
Tematy:
bladed disc
blade
mistuning
Opis:
The dynamic behaviour of a rotor consisting of two tuned and mistuned bladed discs on a solid shaft is considered. The effect of the shaft's flexibility on the dynamic characteristics of the bladed discs and the coupling effects between the shaft and bladed disc modes are investigated. Results show clearly the coupling effects in a bladed disc-shaft system. Interference diagrams are developed, from which the dynamic behaviour of a bladed disc can be predicted for varying flexibility relationships between solid shafts and bladed discs. The global rotating mode shapes of flexible tuned and mistuned bladed disc-shaft assemblies are calculated. Rotational effects, such as centrifugal stiffening, are accounted for and all the possible couplings between the flexible parts are allowed. Calculated natural frequencies obtained from the blade, the bladed disc and the shaft with two discs are checked to discover resonance conditions and coupling effects. It is shown that blade mistuning strongly affects the interaction between flexible bladed discs and a flexible shaft. This interaction affects the flexible bladed disc modes and is not restricted to the modes with zero, one and two nodal diameters. The torsional frequency of the shaft with two bladed discs is coupled with the zero nodal diameter modes of the single bladed discs. It is shown that including the shaft in the bladed discs model is important from the designer's point of view and may alter the spectrum of frequencies considerably.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2006, 10, 3; 275-289
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Byty postzwierzęce w powieści P.K. Dicka Czy androidy marzą o elektrycznych owcach? i w filmowej dylogii Blade Runner
Post-animal Beings in P.K. Dick’s Novel Do the Androids Dream of Electric Sheep? and the Blade Runner Movie Dylogy
Autorzy:
Konefał, Sebastian Jakub
Powiązania:
https://bibliotekanauki.pl/articles/1912561.pdf
Data publikacji:
2021-09-03
Wydawca:
Wydawnictwo Uniwersytetu Śląskiego
Tematy:
Philip K. Dick
Blade Runner
Blade Runner 2049
postzwierzęta
animal studies
animoids
Opis:
Fabuła powieści Philipa K. Dicka Czy androidy marzą o elektrycznych owcach? stała się inspiracją dla twórców scenariuszy do filmów Łowca androidów (1982) oraz Blade Runner 2049 (2017). Poza analizowanymi już wielokrotnie wątkami cogito sztucznych ludzi w “trylogii Blade Runnera” odnajdziemy także strategie narracyjne dające się odczytywać z perspektyw animal studies. Do najważniejszych z nich należy motyw ontologicznych nieciągłości cyberbiologicznych zwierząt (animoidów), a także pomysł narracyjnego powiązania bytów organicznych i technologicznych z ideą międzygatunkowego splotu. Przykłady takich zabiegów służą krytyce społeczeństwa konsumpcyjnego, w kreatywny sposób reinterpretując zjawiska kryzysu duchowości i zmierzchu Antropocenu, wskazując także na widmo ziszczającej się na naszych oczach eko-katastrofy.
The plot of Philip K. Dick’s novel Do Androids Dream of Electric Sheep? inspired the creators of screenplays for the movies Blade Runner (1982) and Blade Runner 2049 (2017). Apart from the often discussed theme of the cogito of the androids, the Blade Runner trilogy also contains narrative strategies that allow researchers to analyse it from the perspective of animal studies. Of particular importance are the ontological discontinuities of cyberbiological animals (animoids) and the idea of interspecies links between organic and technological beings, which is interpreted here as a criticism of consumer society. The foregoing narrative strategies, linked to the spectre of the ecocatastrophe, introduce intertextual references related to the Anthropocene and the crisis of spirituality. They also indicate the necessity of rethinking some of the rudimentary means of cultural categorization.
Źródło:
ER(R)GO: Teoria – Literatura – Kultura; 2021, 42; 197-214
1508-6305
2544-3186
Pojawia się w:
ER(R)GO: Teoria – Literatura – Kultura
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of a Carbon Fiber Prosthetic Running Blade for Enhanced Reliability
Autorzy:
Siddiqui, Md Irfanul Haque
Alnaser, Ibrahim Abdullah
Alluhydan, Khalid
Powiązania:
https://bibliotekanauki.pl/articles/28328270.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
mechanical properties
durability
prosthetic design
running blade prosthesis
materials for running blade
reliable
Opis:
This study focuses on the development of a reliable prosthetic running blade primarily composed of carbon fiber. The reliable performance of novel prosthetic running blades has been evaluated by mechanical testing and finite element numerical modeling. Theexperimental analysis confirmed that these blades exhibit superior suitability for high-impact activities, demonstrating reliable load-bearing capacity and effective shock absorption properties. The tensile testing exhibited a linear elastic behavior of the composite material up to a strain of 0.075 mm/mm. Further, it was found that stress concentration areas and fracture points within the blade structure. Furthermore, numerical results revealed a maximum deflection of 29.60 mm that the blade can achieve. The kinetic energy loss during impact demonstrated an 8.5% decrease in blade kinetic energy, with the highest loss occurring at Vy = 30 m/s. Ultimately, this research aims to enhance the reliability, durability, and safety of prosthetic running blades, empowering athletes to reach new heights in sports.
Źródło:
Eksploatacja i Niezawodność; 2023, 25, 4; art. no. 172668
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A feasibility study on the behaviour of a helicopter smart blade aimed at blade tip morphing
Studium wykonalności działania „ineligentnej” łopaty helikoptera wyposażonej w układ sterowania kształtem jej końca
Autorzy:
Testa, C.
Leone, S.
Ameduri, S.
Concilio, A.
Powiązania:
https://bibliotekanauki.pl/articles/279320.pdf
Data publikacji:
2009
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
smart structures
anhedral helicopter blade
Opis:
In this paper, the behaviour of a hingeless helicopter blade with a novel integrated smart morphing actuator is studied. The proposed smart device is aimed at the reduction of BVI noise through transformation of the blade tip shape into an anhedral tip type and is based on the concept of a variable-stiffness blade. In detail, the blade morphing is obtained through joint action of a magnetorheological-fluid (MRF) device, shape-memory alloy (SMA) tie-rods and a set of concentrated masses properly distributed spanwise. In this architecture, the MRF system has to provide local bending-stiffness reduction and concentrated masses have to provide inertial moments whereas the SMA tie-rods have to mould the blade tip shape. Since the equilibrium configuration of the smart blade deeply depends on the interaction between the aeroelastic response and the actuation loads, in this work a numerical investigation examines potentiality and shortcomings of the proposed integrated smart system to morph a realistic blade with respect to the baseline configuration.
W pracy przedstawiono analizę właściwości bezprzegubowej łopaty helikoptera, w której zastosowano nowy, zintegrowany i aktywny układ oddziaływania na kształt łopaty. Zadaniem tego układu jest redukcja hałasu generowanego wskutek interakcji łopaty i wywołanych jej ruchem wirów ośrodka (blade-vortex interaction – BVI) poprzez zmianę kształtu końca łopaty celującego w uzyskanie ujemnego wzniosu. Metoda wykorzystuję koncepcję łopaty o zmiennej sztywności. W szczególności, kształtowanie łopaty jest sumarycznym efektem działania magneto-reologicznego aktuatora A feasibility study on the behaviour of a helicopter... 921 (MRF), drążków wykonanych ze stopu z pamięcią kształtu (SMA) i zestawu mas skupionych odpowiednio rozłożonych wzdłuż łopaty. W takiej architekturze, podzespół MRF wprowadza lokalną redukcję sztywności giętnej, masy skupione wprowadzają dodatkowy moment bezwładności, podczas gdy drążki SMA sterują kształtem końca łopaty. Ponieważ konfiguracja położenia równowagi „inteligentnej” łopaty silnie zależy od aerosprężystej odpowiedzi układu oraz sił generowanych przez elementy wykonawcze (aktuatory), w pracy skupiono badania na numerycznej symulacji potencjału i ograniczeń wynikających z zastosowania zaproponowanej metody oddziaływania na kształt rzeczywistej łopaty względem konfiguracji bazowej.
Źródło:
Journal of Theoretical and Applied Mechanics; 2009, 47, 4; 897-921
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation investigation of rotor loads and blade deformations in steady states and at boundaries of helicopter flight envelope
Autorzy:
Stanisławski, J.
Powiązania:
https://bibliotekanauki.pl/articles/246484.pdf
Data publikacji:
2017
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
helicopter
rotor loads
blade deformation
Opis:
Results of calculation of the helicopter main rotor loads and deformations of rotor blades are presented. The simulations concern level flight states and cases of boundary flight envelope such as wind gust, dive recovery and pull-up manoeuvre. The calculations were performed for data of the three-bladed articulated rotor of light helicopter. The method of analysis assumes modelling the rotor blades as elastic axes with sets of lumped masses of blade segments distributed along radius of blade. The model of deformable blade allows flap, lead-lag and pitch motion of blade including effects of out-of-plane bending, in-plane bending and torsion due to aerodynamic and inertial forces and moments acting on the blade. Equations of motion of rotor blades are solved applying Runge-Kutta method. Parameters of blade motion, according to Galerkin method, are considered as a combination of assumed torsion and bending eigen modes of the rotor blade. The rotor loads, in all considered cases of flight states, are calculated for quasi-steady conditions assuming the constant value of the following parameters: rotor rotational speed, position of the main rotor axis in air and position of swashplate due to rotor axis which defines the collective and cyclic control pitch angle of blades. The results of calculations of rotor loads and blade deflections are presented in form of timeruns and as distributions on rotor disk due to blade elements radial and azimuthal positions. The simulation investigation may help to collect data for prediction the fatigue strength of blade applying results for steady flight states and for definition the extreme loads for boundaries of helicopter flight envelope.
Źródło:
Journal of KONES; 2017, 24, 2; 239-246
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on key process technology for profile electrolytic finishing of large marine propeller impeller
Autorzy:
Ding, B.
Chen, Y.
Zhou, J.
Chen, P.
Powiązania:
https://bibliotekanauki.pl/articles/259906.pdf
Data publikacji:
2018
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
integral impeller
electrolysis processing
blade
Opis:
An electrolysis process method for free-form blade surface finishing is proposed for a free-form surface impeller, and a stepwise method is used to process the inter-blade channel of the overall impeller. The forming cathode is then used to finish the blade to meet the blade processing requirements. In the design, the forming cathode structure was improved by using motion simulation software, and the flow field simulation software was used to simulate and analyze the cathode flow channel. The cathode shape and the electrolyte flow rate between the electrodes meet the processing requirements. In the process of processing experiments, the motion path of the cathode was analyzed and optimized. The effect of the feed direction on the uneven distribution of the blade machining gap was reduced through optimization, and highfrequency pulse power processing was used to reduce the machining gap and improve the machining accuracy of the blade. The experimental results show that the process scheme is feasible and the precision of the processed impeller free-form surface is significantly improved. The material is a monolithic turbine disk of high-temperature alloys, and its large twisted blade processing has always been a problem in the manufacturing industry.
Źródło:
Polish Maritime Research; 2018, S 2; 158-163
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of steam extraction parameters on unsteady rotor forces
Autorzy:
Rządkowski, R.
Gnesin, V.
Powiązania:
https://bibliotekanauki.pl/articles/1933176.pdf
Data publikacji:
2007
Wydawca:
Politechnika Gdańska
Tematy:
steam extraction
blade
unsteady forces
Opis:
Aerodynamic unsteady forces of rotor blades in a turbine stage with steam extraction were calculated and blade failure was reported. A numerical calculation of the 3D transonic flow of an ideal gas through turbomachinery blade rows moving one in relation to another is presented. An ideal gas flow through mutually moving stator and rotor blades with periodicity on the whole annulus is described with unsteady Euler conservation equations, integrated using the explicit monotonous finite-volume difference scheme of Godunov-Kolgan and a moving hybrid H-H grid. In order to find the pressure distribution of steam parameters behind the rotor blades, calculations were performed for a steady flow through the stage and the steam extraction channels using the SPARC program and the unsteady forces of the rotor blade were calculated for four steam extraction conditions. For the maximal steam extraction the 10th harmonic of the axial force and moment was found to be close to the first natural frequency of the bladed disc with one nodal diameter. Thus, steam extraction can be the cause of the blade's failure.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2007, 11, 3; 253-261
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of rudder and blade pitch on hydrodynamic performance of marine propeller using CFD
Autorzy:
Quang, Pham Ky
Hung, Phan Van
Cong, Nguyen Chi
Tung, Trinh Xuan
Powiązania:
https://bibliotekanauki.pl/articles/32899108.pdf
Data publikacji:
2022
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
rudder
blade pitch
propeller
CFD
Opis:
The use of computational fluid dynamics (CFD) to predict internal and external flows has risen dramatically in the past decade. This research aims to use the commercial software, ANSYS Fluent V.14.5, to illustrate the effects of the rudder and blade pitch on the hydrodynamic performance of the marine propeller by experimenting with propellers and rudders of the M/V Tan Cang Foundation ship, which has designed conditions as follows: diameter of 3.65 m; speed of 200 rpm; average pitch of 2.459 m; boss ratio of 0.1730. Using CFD, the characteristic curves of the marine propeller and some important results showed that the maximum efficiency of the propeller is 0.66 with the open water propeller and 0.689 with the rudder‒propeller system at the advance ratio of 0.6. The obtained outcomes of this research are a significant foundation to calculate and design an innovative kind of propulsion for ships with high performance.
Źródło:
Polish Maritime Research; 2022, 2; 55-63
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design and computational fluid dynamics analysis of the last stage of innovative gas-steam turbine
Autorzy:
Głuch, Stanisław Jerzy
Ziółkowski, Paweł
Witanowski, Łukasz
Badur, Janusz
Powiązania:
https://bibliotekanauki.pl/articles/1955024.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
axial turbine
blade design
computational fluid dynamics
last stage of low-pressure
twisted blade
Opis:
Research regarding blade design and analysis of flow has been attracting interest for over a century. Meanwhile new concepts and design approaches were created and improved. Advancements in information technologies allowed to introduce computational fluid dynamics and computational flow mechanics. Currently a combination of mentioned methods is used for the design of turbine blades. These methods enabled us to improve flow efficiency and strength of turbine blades. This paper relates to a new type turbine which is in the phase of theoretical analysis, because the working fluid is a mixture of steam and gas generated in a wet combustion chamber. The main aim of this paper is to design and analyze the flow characteristics of the last stage of gas-steam turbine. When creating the spatial model, the atlas of profiles of reaction turbine steps was used. Results of computational fluid dynamics simulations of twisting of the last stage are presented. Blades geometry and the computational mesh are also presented. Velocity vectors, for selected dividing sections that the velocity along the pitch diameter varies greatly. The blade has the shape of its cross-section similar to action type blades near the root and to reaction type blades near the tip. Velocity fields and pressure fields show the flow characteristics of the last stage of gas-steam turbine. The net efficiency of the cycle is equal to 52.61%.
Źródło:
Archives of Thermodynamics; 2021, 42, 3; 255-278
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Free vibrations analysis of shrouded bladed discs with one loose blade
Autorzy:
Rządkowski, R.
Kwapisz, L.
Drewczyński, M.
Szczepanik, R.
Rao, J.S.
Powiązania:
https://bibliotekanauki.pl/articles/1955347.pdf
Data publikacji:
2006
Wydawca:
Politechnika Gdańska
Tematy:
blade
shrouded bladed disc
free vibration
Opis:
As a failure of rotor blades in a gas turbine was reported, the rotating-mode shapes of flexible shrouded bladed disc assemblies were calculated using a finite element approach. Rotational effects, such as centrifugal stiffening were accounted for, and all couplings between the flexible parts were allowed. The spin softening effects were neglected. A dynamic analysis of the shrouded bladed disc demonstrated that it was designed with a sufficient safety region of resonance. In case of one blade getting loose, it is vibrating in resonance.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2006, 10, 1; 83-95
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
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