Wyniki wyszukiwania - BazTech

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Electrical Conductivity of Woven Fabrics Coated with Carbon Black Particles

Negru D., Buda C. T., Avram D.

Fibres & Textiles in Eastern Europe

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2012

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Vol. 20, no. 1 (90)

53-56

EN

The aim of this work was to develop a textile fabric with electrical conductivity. This fabric was made from cotton yarns coated with a solution based on carbon black. This paper reports the results of preparing different recipes using a number of quantities of carbon black particles and other components of the coating mixture, which were tested in order to obtain the best results regarding electrical conductivity. The optimal concentration of conductive particles of carbon black was studied.

PL

Wyprodukowano tkaniny o dobrej przewodności elektrycznej, z włókien bawełnianych o splocie płóciennym, pokrytych roztworem zawierającym cząsteczki sadzy. Przedstawiono wyniki przewodności elektrycznej uzyskane przy stosowaniu roztworów o rożnym składzie i rożnym stężeniu cząstek sadzy. Określono optymalny skład i stężenie cząstek sadzy dla uzyskania praktycznych wyników.

2

Monte Carlo simulation-based reliability model for the PSA of a radioactive waste repository

Cadini F., Avram D., Zio E., Luce A., Taglioni A.

Journal of Polish Safety and Reliability Association

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2010

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Vol. 1, No. 1

43--50

EN

Disposal facilities for radioactive wastes comprise a series of engineered barriers whose purpose is to contain the radionuclides until their radiation hazard has decreased to acceptable levels. In this regard, it is required that the long-term functionality of the system of barriers be evaluated by a quantitative risk analysis procedure, also called performance assessment. In this paper, a Monte Carlo simulation-based reliability model is propounded for the preliminary analysis of the safety performance of a radioactive waste repository, accounting also for barrier degradation processes. The model strengths are: simplicity, chich allows ease of computation, and flexibility, which allows modification to account for various physical aspects and inter-comparison of their effects. An application to a case study of literature is presented to validate the approach and demonstrate its flexibility.

3

Particle filtering for the estimation of system mode of operation

Cadini F., Avram D., Zio E.

Journal of Polish Safety and Reliability Association

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2009

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Vol. 1

77--86

EN

Efficient diagnosis and prognosis of system faults depend on the ability to estimate the system state on the basis of noisy measurements of the system dynamic variables and parameters. The system dynamics is typically characterized by transitions among discrete modes of operation, each one giving rise to a specific continuous dynamics of evolution. The estimation of the state of these hybrid dynamic systems is a particularly challenging task because it requires keeping track of the transitions among the multiple modes of system dynamics corresponding to the different modes of operation. In this paper a Monte Carlo estimation method is illustrated with an application to a case study of literature which consists of a tank filled with liquid, whose level is autonomously maintained between two thresholds. The system behavior is controlled by discrete mode actuators, whose states are estimated by a Monte Carlo-based particle filter on the basis of noisy level and temperature measurements.

4

Using Unretted Flax to Obtain Yarns and Woven Fabrics

Mustata A., Avram D., Slabu V.

Fibres & Textiles in Eastern Europe

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2006

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Vol. 14, no. 3 (57)

29--32

EN

The paper discusses the optimisation of some of the working parameters in the processes of extracting and manufacturing unretted flax fibres to eliminate impurities and attain a certain degree of fibre fineness and mean length in the flax yarns obtained. Unretted flax yarn is obtained by a new wet spinning system with a twister tube. This yarn has a new structure, and so its fibres are located parallel to the yarn axis. Yarn strength is determined by recovering the link substances after drying. Their low strength recommends these yarns for woven fabrics processed on machines with medium weaving speed.

PL

Artykuł omawia optymalizację wybranych parametrów procesu ekstrakcji i wytwarzania włókien z nieroszonego lnu, dla wyeliminowania zanieczyszczeń oraz uzyskania w wytworzonej przędzy włókien o określonej grubości i średniej długości. Przędza z nieroszonego lnu uzyskiwana jest w nowo opracowanym procesie przędzenia na mokro z zastosowaniem skręcarki rurkowej. Otrzymana przędza posiada nową strukturę, w której włókna są ułożone równolegle do osi przędzy. Wytrzymałość przędzy jest uwarunkowana usunięciem zanieczyszczeń po suszeniu. Niska wytrzymałość tych przędz wymaga przy tkaniu stosowania krosien o średniej prędkości tkania.