Wyniki wyszukiwania - BazTech

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Multi-Criteria Evaluation and Ranking of Suppliers - Case Study Analysis

Galińska B., Rossi R.

Logistics and Transport

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2018

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Vol. 39, No. 3

21--30

EN

The article presents a coherent methodology of a multiple criteria evaluation of suppliers in furniture industry covering: the definition of a set of variants - laminated chipboards suppliers, the definition of a consistent family of criteria that allows for their comprehensive evaluation, modelling of decision maker’s (DM’s) preferences (including: the definition of the importance of criteria and the DM’s sensitivity towards changes of criteria values), and finally computational experiments resulting in the final ranking of suppliers. Six suppliers have been taken into consideration. In the family of criteria evaluating the suppliers, 9 measures have been taken into account. These have included, among others: product price, product quality, timeliness and reliability of delivery or cost of delivery. In the computational phase a selected MCDM/A ranking method which is Electre III/IV has been applied.

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Analysis of the melting, burning and flame spread of polymers with the particle finite element method

Oñate E., Marti J., Ryzhakov P., Rossi R., Idelsohn S. R.

Computer Assisted Methods in Engineering and Science

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2013

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Vol. 20, no. 3

165--184

EN

A computational procedure for analysis of the melting, burning and flame spread of polymers under fire conditions is presented. The method, termed particle finite element method (PFEM), combines concepts from particle-based techniques with those of the standard finite element method (FEM). The key feature of the PFEM is the use of an updated Lagrangian description to model the motion of nodes (particles) in the thermoplastic material. Nodes are viewed as material points which can freely move and even separate from the main analysis domain representing, for instance, the effect of melting and dripping of polymer particles. A mesh connects the nodes defining the discretized domain where the governing equations are solved using the FEM. An incremental iterative scheme for the solution of the nonlinear transient coupled thermal-flow problem, including radiation, loss of mass by gasification and combustion is used. Examples of the possibilities of the PFEM for the modelling and simulation of the melting, burning and flame spread of polymers under different fire conditions are described.

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Dry and Wet Heat Transfer Through Clothing Dependent on the Clothing Properties Under Cold Conditions

Richards M. G. M., Rossi R., Meinander H., Broede P., Candas V., Hartog den E., Holmer I., Nocker W., Havenith G.

International Journal of Occupational Safety and Ergonomics

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2008

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Vol. 14, No. 1

69--76

EN

The purpose of this study was to investigate the effect of moisture on the heat transfer through clothing in relation to the water vapour resistance, type of underwear, location of the moisture and climate. This forms part of the work performed for work package 2 of the European Union THERMPROTECT project. Thermal manikin results of dry and wet heat loss are presented from different laboratories for a range of 2-layer clothing with similar dry insulations but different water vapour permeabilities and absorptive properties. The results obtained from the different manikins are generally consistent with one another. For each climate, total wet heat loss is predominately dependent on the permeability of the outer layer. At 10 °C, the apparent evaporative heat loss is markedly higher than expected from evaporation alone (measured at 34 °C), which is attributed to condensation within the clothing and to increased conductivity of the wet clothing layers.

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Hot Steam Transfer Through Heat Protective Clothing Layers

Rossi R., Indelicato E., Bolli W.

International Journal of Occupational Safety and Ergonomics

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2004

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Vol. 10, No. 3

239--245

EN

The aim of this study was to analyse the transfer of steam through different types of textile layers as a function of sample parameters such as thickness and permeability. In order to simulate the human body, a cylinder releasing defined amounts of moisture was also used. The influence of sweating on heat and mass transfer was assessed. The results show that in general impermeable materials offer better protection against hot steam than semi-permeable ones. The transfer of steam depended on the water vapour permeability of the samples, but also on their thermal insulation and their thickness. Increasing the thickness of the samples with a spacer gave a larger increase in protection with the impermeable samples compared to semi-permeable materials. Measurements with pre-wetted samples showed a reduction in steam protection in any case. On the other hand, the measurements with a sweating cylinder showed a beneficial effect of sweating.