Autor: Filipovic, N. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Innovative modelling methods in damage assessment: application of dissipative particle dynamics to simulation of damage and self-healing of polymer-coated surfaces
Innowacyjne metody modelowania w szacowaniu zniszczenia. Zastosowanie dynamiki dyssypatywnego układu punktów materialnych do symulacji zniszczenia samonaprawiających się powierzchni pokrywanych polimerami
Autorzy:: Jovanovic, A. S.
Filipovic, N.
Powiązania:: https://bibliotekanauki.pl/articles/280789.pdf
Data publikacji:: 2006
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: modelowanie
inżynieria materiałowa
samonaprawa
modeling
engineering materials
self-healing
Opis:: The paper presents an exemplary application of an innovative modeling technique (Dissipative Particle Dynamics - DPD) as a possible tool for multi-scale modeling of the behavior of advanced engineering materials (e.g. coated materials and/or multi-materials). The multi-scale modeling of the behavior of advanced engineering materials is primarily related to development of new techniques and methods needed to bridge the gap between the atomistic scale and macro applications. The presented example of examination of the applicability of the DPD to damage assessment dealing with the problem of interaction of particles, polymers and surfaces, is an issue concerning many applications in the colloid science. It has confirmed the applicability of the DPD as a method for linking the macro and atomistic scales. The imminent application of the method and the example are in the area of "self-healing" advanced engineering materials, thus in line with the objectives of EuMaT (cf. Appendix).
W artykule zaprezentowano przykładową aplikację innowacyjnej techniki modelowania DPD (Dissipative Particle Dynamics - dynamika dyssypatywnego układu punktów materialnych) jako możliwego narzędzia do wielo-skalowego modelowaniazachowania się zaawansowanych materiałów inżynierskich (z pokryciami wierzchnimi, lub wieloskładnikowych). Modelowanie wielo-skalowe jest związane głównie z rozwojem nowych metod badawczych w opisie zjawisk przy przechodzeniu od poziomu atomistycznego do makroskali. Przedstawiona analiza przydatności metody DPD w szacowaniu zniszczenia zawierającego problem oddziaływania cząstek materiału, polimerów i powierzchni elementów stanowi przykład aplikacji nauki o koloidach. W pracy potwierdzono stosowalność DPD w efektywnym łączeniu makroskali z poziomem atomistycznym. Spodziewane zastosowania zaprezentowanej metody i omówiony przykład wchodzą w zakres zaawansowanych technologii samonaprawiających się materiałów, których rozwój jest konsekwencją wytycznych EuMat (w Dodatku).
Źródło:: Journal of Theoretical and Applied Mechanics; 2006, 44, 3; 637-648
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Computational and experimental model of electroporation for human aorta
Autorzy:: Filipovic, N.
Saveljic, I.
Jovicic, N.
Tanaskovic, I.
Zdravkovic, N.
Powiązania:: https://bibliotekanauki.pl/articles/306780.pdf
Data publikacji:: 2016
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: elektroporacja
wytwarzanie ciepła
ablacja
kształtka wodociągowa
przewodnictwo cieplne
electroporation
heat generation
ablation
VSMC reduction
fitting
conductivity
Opis:: Purpose: In this study the computational and experimental electroporation model with human aorta tissue is made in order to examine the reduction of smooth muscle cells. Methods. The segments in native state of the aorta are treated by electroporation method through a series of electrical impulses from 50 V/cm to 2500 V/cm. For each patient we analyzed one sample with and one sample without electroporation as a control. In the computational study, electrical field distribution is solved by the Laplace equation. The Pennes Bioheat equation without metabolism and blood perfusion heating is used to solve heat transfer problems. Different conductivity values are used in order to fit the experimental results. Results: Experimental histology has shown us that there are a smaller number of vascular smooth muscle cells (VSMC) nuclei at the tunica media, while the elastic fibre morphology is maintained 24 h after electroporation. In the computational model, heat generation coupled with electrical field is included. The fitting procedure is applied for conductivity values in order to make material properties of the aorta tissue. The fitting procedure gives tissue conductivity of 0.44 [S/m] for applied electrical field of 2500 V/cm. Conclusions: Future studies are necessary for investigation of a new device for in-vivo ablation with electroporation of plaque stenosis. It will open up a new avenue for stenosis treatment without stent implantation.
Źródło:: Acta of Bioengineering and Biomechanics; 2016, 18, 4; 15-20
1509-409X
2450-6303
Pojawia się w:: Acta of Bioengineering and Biomechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Neuromechanical control in submaximal drop jumps: The effects of volitional effort demands and drop height magnitude on soleus muscle activation
Autorzy:: Mrdakovic, V.
Pazin, N.
Vulovic, R.
Filipovic, N.
Ilic, D.
Powiązania:: https://bibliotekanauki.pl/articles/307166.pdf
Data publikacji:: 2018
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: elektromiografia
sprzężenie zwrotne
staw skokowy
biomechanika
electromyography
stretch-shortening cycle
feedback control
pre activation
feedforward control
ankle biomechanics
Opis:: The purpose of this study was to investigate soleus muscle activation during different phases of drop jump performed at submaximal levels of volitional effort and drop height magnitude. Methods: Fifteen professional volleyball players with minimum of eight years of experience in jumping activities participated in the study. Experimental protocol involved executing submaximal drop jumps at three levels of volitional effort (i.e., 65, 80 and 95% of the maximal height of jump). All submaximal drop jumps were done from three drop heights (20, 40 and 60 cm). The soleus muscle activation was monitored during four jump phases: pre-activation phase before touchdown, early contact phase upon touchdown, early and late push-off phase. Results: The results indicate that volitional effort level did not change the muscle activation during pre activation and early contact phase, but only in early and late push-off phase ( p ≤ 0.05). Conversely, it was observed that muscle activation during all phases of drop jump was adapted to the increased intensity of the external load caused by increasing of drop height magnitude ( p ≤ 0.01). Conclusions: The findings of the present study suggested that soleus muscle activation has selective responses to internal load (i.e., volitional effort level) and external load (i.e., drop height magnitude) intensities when drop jump is executing with submaximal effort.
Źródło:: Acta of Bioengineering and Biomechanics; 2018, 20, 4; 101-111
1509-409X
2450-6303
Pojawia się w:: Acta of Bioengineering and Biomechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Leg stiffness adjustment during hopping at different intensities and frequencies
Autorzy:: Mrdakovic, V.
Ilic, D.
Vulovic, R.
Matic, M.
Jankovic, N.
Filipovic, N.
Powiązania:: https://bibliotekanauki.pl/articles/307107.pdf
Data publikacji:: 2014
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: połączenie
węzeł podatny
sztywność
skoki
joint stiffness
jumping performance
preferred hopping frequency
spring-mass model
Opis:: Understanding leg and joint stiffness adjustment during maximum hopping may provide important information for developing more effective training methods. It has been reported that ankle stiffness has major influence on stable spring-mass dynamics during submaximal hopping, and that knee stiffness is a major determinant for hopping performance during maximal hopping task. Furthermore, there are no reports on how the height of the previous hop could affect overall stiffness modulation of the subsequent maximum one. The purpose of the present study was to determine whether and how the jump height of the previous hop affects leg and joint stiffness for subsequent maximum hop. Ten participants completed trials in which they repeatedly hopped as high as possible (MX task) and trials in which they were instructed to perform several maximum hops with 3 preferred (optimal) height hops between each of them (P3MX task). Both hopping tasks were performed at 2.2 Hz hopping frequency and at the participant's preferred (freely chosen) frequency as well. By comparing results of those hopping tasks, we found that ankle stiffness at 2.2 Hz (p=0.041) and knee stiffness at preferred frequency (p=0.045) was significantly greater for MX versus P3MX tasks. Leg stiffness for 2.2 Hz hopping is greater than for the preferred frequency. Ankle stiffness is greater for 2.2 Hz than for preferred frequencies; opposite stands for knee stiffness. The results of this study suggest that preparatory hop height can be considered as an important factor for modulation of maximum hop.
Źródło:: Acta of Bioengineering and Biomechanics; 2014, 16, 3; 69-76
1509-409X
2450-6303
Pojawia się w:: Acta of Bioengineering and Biomechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Structural and Electrical Properties of Sintered Barium-Zinc-Titanate Ceramics
Autorzy:: Obradović, N.
Filipović, S.
Pavlović, V.
Paunović, V.
Mitrić, M.
Ristić, M.
Powiązania:: https://bibliotekanauki.pl/articles/1503704.pdf
Data publikacji:: 2011-08
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 81.20.Wk
81.20.Ev
61.05.C-
84.37.+q
Opis:: The aim of this work was an investigation of structural and electrical properties of sintered barium-zinc-titanate ceramics. Mixtures of $BaCO_{3},$ $ZnO$ and $TiO_{2}$ were mechanically activated in a planetary ball mill up to 80 minutes and sintered isothermally in air for 120 minutes at 1300°C. The phase composition in the $BaCO_{3}-ZnO-TiO_{2}$ system after milling and sintering was analyzed using the XRD method. The existence of pure barium-zinc-titanate has been registered. Microstructure analyses were performed using SEM. The results of electric resistivity, capacitance and loss tangent of the sintered samples were correlated with the XRD and SEM results.
Źródło:: Acta Physica Polonica A; 2011, 120, 2; 322-325
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: The use of multivariate analysis of the radon variability in the underground laboratory and indoor environment
Autorzy:: Filipović, J.
Maletić, D.
Udovičić, V.
Banjanac, R.
Joković, D.
Savić, M.
Veselinović, N.
Powiązania:: https://bibliotekanauki.pl/articles/147023.pdf
Data publikacji:: 2016
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: multivariate analysis
radon variability
Opis:: The paper presents results of multivariate analysis of variations of radon concentrations in the shallow underground laboratory and a family house, depending on meteorological variables only. All available multivariate classifi cation and regression methods, developed for data analysis in high-energy physics and implemented in the toolkit for multivariate analysis (TMVA) software package in ROOT, are used in the analysis. The result of multivariate regression analysis is a mapped functional behaviour of variations of radon concentration depending on meteorological variables only, which can be used for the evaluation of radon concentration, as well as to help with modelling of variation of radon concentration. The results of analysis of the radon concentration variations in the underground laboratory and real indoor environment, using multivariate methods, demonstrated the potential usefulness of these methods. Multivariate analysis showed that there is a potentially considerable prediction power of variations of indoor radon concentrations based on the knowledge of meteorological variables only. In addition, the online system using the resulting mapped functional behaviour for underground laboratory in the Institute of Physics Belgrade is implemented, and the resulting evaluation of radon concentrations are presented in this paper.
Źródło:: Nukleonika; 2016, 61, 3; 357-360
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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