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Tytuł:
Anderson Localization in Quantum Chaos: Scaling and Universality
Autorzy:
García-García, A. M.
Wang, J.
Powiązania:
https://bibliotekanauki.pl/articles/2047824.pdf
Data publikacji:
2007-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.15.Rn
71.30.+h
05.45.Df
05.40.-a
Opis:
The one-parameter scaling theory is a powerful tool to investigate Anderson localization effects in disordered systems. In this paper we show that this theory can be adapted to the context of quantum chaos provided that the classical phase space is homogeneous, not mixed. The localization problem in this case is defined in momentum, not in real space. We then employ the one-parameter scaling theory to: (a) propose a precise characterization of the type of classical dynamics related to the Wigner-Dyson and Poisson statistics which also predicts in which situations Anderson localization corrections invalidate the relation between classical chaos and random matrix theory encoded in the Bohigas-Giannoni-Schmit conjecture, (b) to identify the universality class associated with the metal-insulator transition in quantum chaos. In low dimensions it is characterized by classical superdiffusion, in higher dimensions it has in general a quantum origin as in the case of disordered systems. We illustrate these two cases by studying 1d kicked rotors with non-analytical potentials and a 3d kicked rotor with a smooth potential.
Źródło:
Acta Physica Polonica A; 2007, 112, 4; 635-653
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Balancing Offshoring and Agility in the Apparel Industry: Lessons From Benetton and Inditex
Offshoring w przemyśle odzieżowym na przykładzie firm Benetton i Inditex
Autorzy:
Sartal, A.
Martínez-Senra, A. I.
García, J. M.
Powiązania:
https://bibliotekanauki.pl/articles/233843.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
offshoring
agility
apparel industry
organizational innovation
time to market
przemysł odzieżowy
innowacje organizacyjne
cykl produkcyjny
Opis:
Based on a case study from the apparel industry, the paper addresses how the organizational innovations adopted by Benetton and Inditex allowed them to balance lower production costs in developing countries with an adequate response time to frequent preference changes and increasing demands for customisation. Findings confirm the fragility of multinationals whose offshoring strategy has not considered the costs of coordinating suppliers in far-off locations and suggest organisational improvements that make production costs, variety and time to market goals compatible. Our research thus provides a view of the conditions and processes that can overcome in increasingly volatile environments the misalignment between demand changes and the limited reactivity of industrial infrastructures. Furthermore the innovation strategy of textile companies has created generalizable lessons for other sectors in which demand uncertainty is high, life cycles short, and customers are, to some extent, prepared to pay for “speed to market”.
Na podstawie studium przypadku z branży odzieżowej w artykule przedstawiono, w jaki sposób innowacje organizacyjne przyjęte przez firmy Benetton i Inditex pozwoliły na obniżenie kosztów produkcji w krajach rozwijających się z zachowaniem odpowiedniego czasu reakcji na częste zmiany preferencji i rosnące wymagania klientów. Wyniki potwierdzają niestabilność firm międzynarodowych, których strategia offshoringowa nie uwzględniała kosztów koordynacji dostawców. Przeprowadzone badania pozwalają wskazać rozwiązania problemów, z którymi borykają się firmy działające w specyficznych warunkach częstej zmiany popytu i ograniczonej reaktywności infrastruktury przemysłowej. Ponadto strategia innowacyjna firm tekstylnych może być przykładem dla innych sektorów, w których panuje równie wysoka niepewność popytu i krótki cykl życia produktu.
Źródło:
Fibres & Textiles in Eastern Europe; 2017, 2 (122); 16-23
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On board LNG reliquefaction technology: a comparative study
Autorzy:
Gómez, J.
Gómez, M.
Garcia, R.
Catoira, A.
Powiązania:
https://bibliotekanauki.pl/articles/963412.pdf
Data publikacji:
2014
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
reliquefaction
boil-off gas
vessel
Brayton Cycle
efficiency
Opis:
Reliquefaction technologies are being currently applied on board liquefied natural gas (LNG) carriers on the basis of economic criteria and energy efficiency. A variety of reliquefaction techniques have been developed so far during the last decade. Nevertheless, technology enhancement continues being a research area of interest. In this article the different technologies applied to the reliquefaction of the boil-off gas (BOG) on LNG carriers have been described, analysed and discussed, contributing to highlight the process and operation characteristics as well as selection plant criteria. Finally, a comparison of the different reliquefaction plants, considering their capacities and efficiencies as well as other technical data of interest has been carried out.
Źródło:
Polish Maritime Research; 2014, 1; 77-88
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new turtle species of Brodiechelys from the Early Cretaceous of Spain: Systematic and palaeobiogeographic implications
Autorzy:
Perez-Garcia, A.
Gasaulla, J.M.
Ortega, F.
Powiązania:
https://bibliotekanauki.pl/articles/946018.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
testudines
pan-cryptodira
xinjiangchelyidae
brodiechelys
cretaceous
europe
spain
Opis:
Brodiechelys brodiei is an Early Cretaceous turtle from Great Britain, the only species of the genus. This taxon has been shown in recent phylogenies to be closely related to Xinjiangchelyidae and therefore could be the only representative of this group in Europe. Here, we present several specimens from the Early Cretaceous Maestrazgo Basin, in the Iberian Range of Spain attributed to the British genus, and to a new species, Brodiechelys royoi. This discovery shows that, as previously observed with terrestrial turtles, some freshwater turtle taxa had a wide European distribution during the Early Cretaceous, being present in both Britain and the Iberian Peninsula. This study sheds new light on the phylogenetic position of this enigmatic genus, supporting its attribution to Xinjiangchelyidae, a clade whose presence has been previously confirmed exclusively from the Middle Jurassic to Early Cretaceous of Asia. We propose that another recently identified taxon from the Iberian Peninsula (i.e., Larachelus morla) is also a member of this clade. Recent studies have identified several continental taxa of the clade that included the members of “Macrobaenidae” and “Sinemydidae” in Europe. This study provides new evidence of close relationships between the Early Cretaceous turtle faunas from Europe and Asia.
Źródło:
Acta Palaeontologica Polonica; 2014, 59, 2; 333-342
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Isolation and purification of malate dehydrogenase in helminth parasites
Izolacja i oczyszczanie dehydrogenazy jabłczanowej robaków pasożytniczych
Autorzy:
Sanchez-Moreno, M.
Tejada, P.
Garcia-Ruiz, M.A.
Monteoliva, M.
Powiązania:
https://bibliotekanauki.pl/articles/836358.pdf
Data publikacji:
1988
Wydawca:
Polskie Towarzystwo Parazytologiczne
Tematy:
isolation
purification
malate dehydrogenase
helminth parasite
parasite
Ascaris suum
Hymenolepis microstoma
Moniezia expansa
Opis:
Z homogenatów Ascaris suum, Fasciola hepatica i Moniezia expansa izolowano i oczyszczano dehydrogenazę jabłczanową (E.C.1.1.1.37) zarówno rozpuszczalną, jak i mitochondrialną, stosując wielokrotne, frakcjonowane wirowanie, a następnie chromatografię kolumnową na celulozie - DE-22 DEAE. W homogenatach wszystkich trzech pasożytów stwierdzono wysoką aktywność obu postaci MDH. Maksimum aktywności w przypadku A. suum i F. hepatica wyrażało się dwoma wierzchołkami, a w przypadku M. expansa jednym dla aktywności m-MDH i dwoma wierzchołkami dla s-MDH (ryc.). Stopień czystości obydwu postaci MDH okazał się różny, zależnie od gatunku pasożyta. Autorzy, na podstawie uzyskanych wyników, rozważają szlaki przemian energetycznych w organizmach badanych gatunków pasożytów.
Źródło:
Annals of Parasitology; 1988, 34, 2
0043-5163
Pojawia się w:
Annals of Parasitology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Restoration of Charcoal-Site Soil Properties on Modified Land Models through Bioremediation Potential of Peanut (Arachis hypogaea L.)
Autorzy:
Mejico, Siegfred M.
Garcia, Renier B.
Familara, Joanne A.
Powiązania:
https://bibliotekanauki.pl/articles/1077471.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Arachis hypogaea
bioremediation potential
charcoal site soil
fire-induced perturbation
peanut
peanuts
physicochemical properties
Opis:
Burning can substantially change vegetation status, and enhance the soil erosion of previously productive areas (Santin & Doerr, 2016). This is why bioremediation techniques have been developed to accelerate the recovery of soil properties. In this four month-long study, the bioremediation potential of peanut plants was tested in restoring charcoal-site soil properties. The experiment had three set-ups, a positive control and a control that had undergo pyrolysis for a week and then was planted with peanuts. The moisture content and pH, Nitrogen, Phosphorus and Potassium (NPK) of all soils were tested with a soil kit from the Department of Agriculture, before and after pyrolysis and after four months, which was also validated by the Bureau of Soils. In the experiment, plant morphology, mainly height, number of leaves and leaf area index (LAI) showed a linear increase all throughout the study, unlike the number of flowers. These were sporadic, with first appearance on week 4, and had a peak of 16 flowers at week 10 from 14 pods. With regard to soil properties, planting peanuts made the soil alkaline (7.3 - up from 5.8 pH after pyrolysis), while Nitrogen content increased from low to medium. In contrast, Phosphorus levels stayed high all throughout the study, while Potassium levels decreased after the pyrolysis and become deficient after four months. Moreover, the moisture content increased from 3.905 after pyrolysis, to 12.69. These results provide evidence that the peanut plant has bioremediation potential on charcoal-site soils after a four month long treatment period.
Źródło:
World News of Natural Sciences; 2019, 23; 321-335
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cranial variability of the European Middle Triassic sauropterygian Simosaurus gaillardoti
Autorzy:
Chaves, C.de M.
Ortega, F.
Perez-Garcia, A.
Powiązania:
https://bibliotekanauki.pl/articles/23226.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Opis:
Simosaurus is a Triassic eosauropterygian genus known from cranial and postcranial elements, found in the Middle and Upper Triassic strata of Europe and the Middle East. Simosaurus gaillardoti is currently recognised as the only valid species of the genus, identified in Ladinian strata of an area that includes northeastern France (Lorraine) and southwestern Germany (Baden-Württemberg). The remains from this area include more than 20 skulls. Although some of them were described in detail and figured by several authors since the discovery of S. gaillardoti, many others remained unpublished. Here we study and figure 25 skulls from this taxon, reviewing the previously known specimens, and presenting and analyzing numerous unpublished skulls. This significant sample of skulls from a single taxon of a European Triassic eosauropterygian allows us to recognise intraspecific variability in characters previously identified as non-variable in this species, including some that are often included in phylogenetic analyses of these reptiles. Therefore, we markedly increase our knowledge of the cranial skeleton in this taxon.
Źródło:
Acta Palaeontologica Polonica; 2018, 63, 2
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of probability density functions in modeling sample distribution of surface electromyographic (sEMG) signals
Autorzy:
Rosa, I. G.
Garcia, M. A. C.
Souza, M. N.
Powiązania:
https://bibliotekanauki.pl/articles/230062.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
electromyography
EMG
surface EMG
sEMG
EMG onset detection
Opis:
The surface electromyography signal (sEMG) has been typically modeled as a Gaussian random process. However, some authors have reported that the probability density functions (pdfs) associated with the sample distribution of sEMG signal exhibits a more peaked shape than one could expected for a Gaussian pdf. This work aimed to reinvestigate the profile of the sEMG pdfs during five different load levels of isometric contractions of biceps brachii muscle, and compared the adequacy of four different pdfs (Gaussian, Logistic, Cauchy, and Laplacian) in describing the sample distribution of such signal. Experimental pdfs were estimated for each subject and load condition. The comparison between experimental pdfs obtained from sEMG data of forty volunteers and four theoretical pdfs was performed by fitting these functions to its experimental counterpart, and using a mean absolute errors in the assessment of the best fit. On average, the Logistic pdf seemed to be the best one to describe the sample distribution of sEMG signal, although the probabilistic results, considering binomial trials, were significant for both Gaussian and Logistic pdfs.
Źródło:
Archives of Control Sciences; 2013, 23, 4; 381-393
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of the new Monte Carlo code AlfaMC to the calibration of alpha-particle sources
Autorzy:
Jurado Vargas, M.
Fernández Timón, A.
García Orellana, C.
Powiązania:
https://bibliotekanauki.pl/articles/148497.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
alpha-particle spectrometry
code AlfaMC
Monte Carlo simulation
scattering and self-absorption
Opis:
Measurements of α-particle sources require corrections to the counting rate due to scattering and self- -absorption in the source and the backing material. In this study, we describe a simple procedure to estimate these corrections using the new Monte Carlo code AlfaMC to consider the effects of scattering and self-absorption conjointly, and so to determine the activity of α emitters. The procedure proposed was applied to 235UO2 sources deposited on highly polished platinum backings. In general, the dependence of the efficiency with source thickness was in good agreement with a simple model considering a linear and a hyperbolic behavior for thin and thick sources, respectively, although significant deviations from this model were found for very thin sources. For these very thin sources, the Monte Carlo simulation revealed to be as a required method in the primary calibration of α-particle sources. The efficiency results obtained by simulation with AlfaMC were in agreement with available efficiency data.
Źródło:
Nukleonika; 2015, 60, No. 3, part 2; 651-655
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Isolation and purification of malate dehydrogenase in helminth parasites
Izolacja i oczyszczanie dehydrogenazy jabłczanowej robaków pasożytniczych
Autorzy:
Sanchez-Moreno, M.
Tejada, P.
Garcia-Ruiz, M.A.
Monteoliva, M.
Powiązania:
https://bibliotekanauki.pl/articles/2152590.pdf
Data publikacji:
1988
Wydawca:
Polskie Towarzystwo Parazytologiczne
Tematy:
isolation
purification
malate dehydrogenase
helminth parasite
parasite
Ascaris suum
Hymenolepis microstoma
Moniezia expansa
Opis:
Z homogenatów Ascaris suum, Fasciola hepatica i Moniezia expansa izolowano i oczyszczano dehydrogenazę jabłczanową (E.C.1.1.1.37) zarówno rozpuszczalną, jak i mitochondrialną, stosując wielokrotne, frakcjonowane wirowanie, a następnie chromatografię kolumnową na celulozie - DE-22 DEAE. W homogenatach wszystkich trzech pasożytów stwierdzono wysoką aktywność obu postaci MDH. Maksimum aktywności w przypadku A. suum i F. hepatica wyrażało się dwoma wierzchołkami, a w przypadku M. expansa jednym dla aktywności m-MDH i dwoma wierzchołkami dla s-MDH (ryc.). Stopień czystości obydwu postaci MDH okazał się różny, zależnie od gatunku pasożyta. Autorzy, na podstawie uzyskanych wyników, rozważają szlaki przemian energetycznych w organizmach badanych gatunków pasożytów.
Źródło:
Wiadomości Parazytologiczne; 1988, 34, 2; 113-124
0043-5163
Pojawia się w:
Wiadomości Parazytologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Air-spore in Cartagena, Spain: Viable and non-viable sampling methods
Autorzy:
Elvira-Rendueles, B.
Moreno, J.
Garcia-Sanchez, A.
Vergara, N.
Martinez-Garcia, M.J.
Moreno-Grau, S.
Powiązania:
https://bibliotekanauki.pl/articles/51349.pdf
Data publikacji:
2013
Wydawca:
Instytut Medycyny Wsi
Źródło:
Annals of Agricultural and Environmental Medicine; 2013, 20, 4
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimal design of membership functions of a fuzzy logic controller for an autonomous wheeled mobile robot using ant colony optimization
Autorzy:
Martínez, P.
Castillo, O.
Alanis, A.
Garcia, M.
Soria, J.
Powiązania:
https://bibliotekanauki.pl/articles/384537.pdf
Data publikacji:
2010
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
fuzzy control
ant colony optimization
autonomous mobile robots
Opis:
In this paper we describe the application of a Simple ACO (S-ACO) as a method of optimization for membership functions' parameters of a fuzzy logic controller (FLC) in order to find the optimal intelligent controller for an Autonomous Wheeled Mobile Robot. Simulation results show that ACO outperforms a GA in the optimization of FLCs for an autonomous mobile robot.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2010, 4, 1; 43-48
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new freshwater basal eucryptodiran turtle from the Lower Cretaceous of Spain
Autorzy:
Perez-Garcia, A.
De La Fuente, M.S.
Ortega, F.
Powiązania:
https://bibliotekanauki.pl/articles/20420.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
new genus
new species
freshwater turtle
eucryptodiran turtle
Lower Cretaceous
Cretaceous
paleontology
Spain
Testudines
Eucryptodira
Barremian
Las Hoyas
Opis:
A freshwater turtle from the lithographic limestone of Las Hoyas (Barremian of Cuenca, Spain) is described as a new genus and species of Eucryptodira, Hoyasemys jimenezi. The holotype consists of the skull, lower jaw, carapace, plastron, vertebral column, pectoral and pelvic girdle remains, and foreand hindlimbs. Hoyasemys jimenezi gen. et sp. nov. is characterized by three pairs of blind oblique depressions on the ventral surface of the basisphenoid, and a character combination composed, among others, of the articulation between the fourth and fifth cervical vertebrae through a cotyle in the fourth and a condyle in the fifth, amphicoelous caudal centra, and most digits of manus and pes with three elongated phalanges. This study allows clarification of the systematic position of a species of uncertain affinity often identified as “chelydroid” in appearance. A phylogenetic analysis shows Hoyasemys jimenezi gen. et sp. nov. forms a monophyletic group with Judithemys sukhanovi, Dracochelys bicuspis, Sinemys lens, and Ordosemys leios, collectively the sister group of crown Cryptodira.
Źródło:
Acta Palaeontologica Polonica; 2012, 57, 2
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
BIBO stabilisation of continuous-time Takagi–Sugeno systems under persistent perturbations and input saturation
Autorzy:
Salcedo, J. V.
Martínez, M.
García-Nieto, S.
Hilario, A.
Powiązania:
https://bibliotekanauki.pl/articles/330698.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
linear matrix inequalities
fuzzy system
nonlinear system
input saturation
disturbance
liniowe nierówności macierzowe
układ rozmyty
układ liniowy
nasycenie wejściowe
Opis:
This paper presents a novel approach to the design of fuzzy state feedback controllers for continuous-time non-linear systems with input saturation under persistent perturbations. It is assumed that all the states of the Takagi–Sugeno (TS) fuzzy model representing a non-linear system are measurable. Such controllers achieve bounded input bounded output (BIBO) stabilisation in closed loop based on the computation of inescapable ellipsoids. These ellipsoids are computed with linear matrix inequalities (LMIs) that guarantee stabilisation with input saturation and persistent perturbations. In particular, two kinds of inescapable ellipsoids are computed when solving a multiobjective optimization problem: the maximum volume inescapable ellipsoids contained inside the validity domain of the TS fuzzy model and the smallest inescapable ellipsoids which guarantee a minimum *-norm (upper bound of the 1-norm) of the perturbed system. For every initial point contained in the maximum volume ellipsoid, the closed loop will enter the minimum *-norm ellipsoid after a finite time, and it will remain inside afterwards. Consequently, the designed controllers have a large domain of validity and ensure a small value for the 1-norm of closed loop.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2018, 28, 3; 457-472
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of the mechanomyographic signal of three different muscles and at different levels of isometric contractions
Autorzy:
Jotta, B.
Garcia, M. A. C.
Pino, A. V.
Souza, M. N. de
Powiązania:
https://bibliotekanauki.pl/articles/306272.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
mechanomiografia
sygnał MMG
mięśnie
siła mięśni
mechanomyography
MMG signal
muscle twitch
muscle activation pattern
muscle force
Opis:
Purpose: Lateral (X) and longitudinal (Y) mechanical oscillations of muscle fibers that take place during muscular contraction seem to contain information additionally to the myoelectric activity, which can contribute to the interpretation of some muscle gradation force mechanisms. However, no previous study was found that had investigated the relationship between the muscle force and features associated to the mechanomyographic (MMG) signal obtained by means of a biaxial accelerometer in three different muscles. Therefore, the aim of this study was to evaluate the relationship between the force output at different load levels (20% to 100%) of the maximum voluntary isometric contraction (%MVIC) and the two signals supplied by a biaxial accelerometer and, in addition, the so-called resultant (R) acceleration signal derived from the two signals mentioned previously. Twenty seven male volunteers participated in this study. Methods: The force output related to the right biceps brachii, soleus and gastrocnemius medialis muscles was studied by means of linear regression models fit to log-transformed of the root mean square (RMS) values of the MMG signals in X, Y, and R axes versus each %MVIC. The phase angle of R acceleration (PhaseR) and anthropometric data were also considered. Results: The angular coefficient a and the antilog of y-intercept b from the log-transformed of MMG data values versus force output were able to distinguish partially motor unit strategies during isometric contractions in the three muscles studied. Conclusion: The findings suggest that biaxial accelerometer seems to be an interesting approach in the assessment of muscle contraction properties.
Źródło:
Acta of Bioengineering and Biomechanics; 2015, 17, 4; 73-84
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
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