This article takes the form of a discussion. It presents problems concerning the determination of particle size and average diameter. The particles were analysed as the dispersed phase in various systems, including colloidal. It describes the basic methods for the measurement of the particle size and the advantages and disadvantages of these methods.
Keywords: particle size, methods of measurement,
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Magdalena Bacior, Aleksandra Siewiorek, Artur Kudyba, Natalia Sobczak
The paper presents the results of the effect of coating type on the amount of ionic contaminants present on printed circuit boards. The study was performed at the RT on the PCB with three types of coatings: HASL LF - lead-free, ENIG, OSP - organic coating.
Keywords: ionic contamination, PCB,
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Janusz Faber, Maria Żmudzińska, Katarzyna Perszewska
This paper presents the applicability of Bio Activ PH biopreparation in the treatment of toxic substances (phenol, formaldehyde) in selected types of waste mouldings and core laboratory scale. This method has not been used for this type of waste so far. The possibilities of biodegradation of pollutants in the waste mass made of phenolic-coated sand were explored. The application of the ready biopreparation for the removal of phenol compounds from the waste masses effluents gave positive results; however, its direct addition to the waste did not bring the expected results.
Keywords: biodegradation, biopreparation, waste, cleaning, moulding, environmental protection,
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Andrzej Gwiżdż, Marcin Małysza, Mieczysław Nowak
Pouring and solidification of EN-GJS-400-15 ductile cast iron castings of soft wedge gate valves for PE pipes used in gas pipelines was simulated. The analysis was performed in Flow-3D program. On the basis of the two-dimension documentation provided by Fabryka Armatur JAFAR SA, three-dimension solids were prepared in CAD, which were subsequently subject to simulation analysis of pouring and solidification of castings of gate valves of three sizes: DN50, DN100 and DN150. This paper presents the analysis of iron castings forming DN150 gate valve. The analysis covered different technologies of casting and was the basis for selecting the optimum casting technology, which became the basis for the preparation of design documentation of match plates and models for the performance of prototype castings. The use of Flow-3D program for the simulation of pouring and solidification process of castings for smaller DN50 gate valves will be described in part II.
Keywords: computer-aided casting manufacture, simulation of pouring and solidification, cast iron fittings for gas transmission installations,
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