Wyniki wyszukiwania - BazTech

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Computational and experimental model of electroporation for human aorta

Filipovic N., Saveljic I., Jovicic N., Tanaskovic I., Zdravkovic N.

Acta of Bioengineering and Biomechanics

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2016

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Vol. 18, no. 4

15--20

EN

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.

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Wstępne wyniki badań oporów przepływu cieczy w rurociągach i kształtkach z polipropylenu

Kotowski A., Cisowska I.

Gaz, Woda i Technika Sanitarna

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2003

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Nr 11

388-393

EN

Experimental station scheme. Dependence between linear resistance factor and Reynolds' number. Comparison of different values of linear resistance factor calculated by common calculation models for hydraulically smooth pipes. Quantity research and quality description of linear and local resistance in pipelines and hydraulically smooth fittings.

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Eksperymentalne badania oporów hydraulicznych w zgrzewanych kształtkach z tworzyw sztucznych

Siwiec T., Morawski D., Karaban G.

Gaz, Woda i Technika Sanitarna

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2002

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Nr 2

49-50

EN

Example of making a welded bell joint. Local resistance factor values for selected fittings. Scheme of a measurement stand and research methodics. Mathematical dependence in marking local resistance factors.

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Wytwarzanie żeliwa sferoidalnego przeznaczonego na odlewy kształtek wodociągowych

Mitko M.

Przegląd Odlewnictwa

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1999

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Vol. 49, z. 8-9

308-310

PL

W artykule opisano przebieg i wyniki badań, zmierzających do spełnienia wymagań stawianych żeliwu sferoidalnemu przeznaczonemu na odlewy kształtek wodociągowych. Żeliwo wytapiano w żeliwiakach z podgrzewanym dmuchem wzbogaconym w tlen. Badania obejmowały określenie wpływu udziału we wsadzie metalowym surówki odlewniczej hematytowej i surówki przeróbczej "Purofex" (przy ich całkowitym udziale 60%) na skład chemiczny, strukturę i właściwości mechaniczne otrzymywanego żeliwa sferoidalnego. Korzystne okazało się zwiększenie udziału surówki przeróbczej w przedziale od 0 do 60%.

EN

In the article the course and the investigation results aiming at the fulfilment of the requirements made to S.G. iron designed for castings of water pipe fittings. The iron was melted in the hot blast oxygen enriched cupolas. The investigation included the effect of the amount in the metallic charge ot the hematite pig iron and of the "Purofex" steelmaking pig iron (considering their entire content 60%) on the chemical composition, structure and mechanical properties of the obtained S.G. iron. The increase in the steelmaking pig iron in the range from 0 to 60% proved to be advantageous.