Wyniki wyszukiwania - BazTech

1

A method of calculation for pressure collector-pipelines

Chernyuk V. V.

Zeszyty Naukowe Politechniki Rzeszowskiej. Budownictwo i Inżynieria Środowiska

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2009

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z. 54 [266]

19-25

EN

A new method of calculation in which all geometric parameters of the pipeline and all characteristics of the stream are taken into account is suggested for collector pipelines. The results of calculations made by means of obtained formulae practically coincide with experimental data.

2

Multicommutation flow analysis with chemiluminescence detection: application to the chromium(III) determination

Koronkiewicz S., Sobczuk M.

Environmental Biotechnology

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2008

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Vol. 4, No. 1

25-31

EN

The study deals with the application of multicommutation flow analysis for determination of Cr(III) concentration in environmental samples at a trace level. The detection method was based on the luminol-H2O2 chemiluminescence reaction in basic aqueous solution using Cr(III) ions as a catalyst. The experimental part of investigation focused on the optimization of equipment conditions, i.e. reagent flow rate, injected sample volume and the work of solenoid valves. The specificity of the method was tested with respect to selected heavy metal ions. The presented method allowed determination of Cr(III) over the range from 2.5 to 50ng*cm-3, with a low detection limit (under optimum conditions: 0.15ng*cm-3). Multicommutation is one of the best methods of analytical procedure automation. The main advantages of multicommutation method, compared with classical flow injection analysis (FIA), is the ability to achieve more repeatable analytical signal, which in turn allows to improve the method precision (relative standard deviation, RSD, was 1.8% for 10 determinations of 20ng*cm-3 Cr(III)). Moreover, it is excellent from the point of view of environmental protection because it offers very low reagent consumption: luminol 0.26; H2O2 2.16; sample 0.15 (cm3 per peak). The sampling rate was about 90 samples*h-1.

3

Expectation of the parts quality on the ground the simulation of the injection moulding process

Nabialek J., Koszkul J., Gnatowski A.

Archives of Materials Science and Engineering

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2008

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Vol. 32, nr 2

109-112

EN

Purpose: The aim of this paper was to present results of researches concerned to predestining quality of polymer parts created by injection moulding method. The estimation of structural solution quality was made on the grounds of the injection moulding computer simulation. Results of studies were compared with predictions presented in professional literature. Design/methodology/approach: Series of injection moulding computer simulations were carried out for different structural solutions of chosen polypropylene part. Supported by taken results predicted quality of part was evaluated. Next literature studies were carried out to compare taken results with instances happened in industrial practice. The analysis of computer simulations usability in designing process of polymer products was made. For the simulation investigations a professional computer software Moldflow Plastics Insight ver. 6.1. has been employed. Findings: Modern computer programs for injection moulding process simulation allow us to predict the quality of final product. Applied algorithms and calculation methods makes elimination of structural defects possible, on the stage of production process designing. Using computer methods to design and optimization of structural conclusions of parts, cut down time and costs of initiating to production. Research limitations/implications: Authors didn’t have the possibility to inject part in every considered in the article structural versions. In the future it is planed to realize the appropriate injection moulds that make possible the presentation of probable structural errors of polymer parts. Moulds like this could have big educational meaning. Practical implications: Results received during studies are going to be used during didactic studies with students and during trainings for injection moulding machines operators. Originality/value: Results of studies presented in the article permit us to understand the meaning of simulating computer programs application in designing and initiating to production of polymer parts

4

Oprogramowanie wspomagające analizę i przetwarzanie obrazów tomograficznych

Sztuka P., Grudzień K., Romanowski A.

Automatyka / Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie

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2006

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T. 10, z. 3

209-219

PL

Tomografia procesowa jest techniką pomiarową pozwalającą wizualizować w postaci dwu- bądź trójwymiarowego obrazu rozkład materiału w przestrzeni pomiarowej czujnika. Informacja wizyjna otrzymana za pomocą technik tomograficznych, a szczególnie jej analiza i przetworzenie, pozwala na badanie czasowo-przestrzennych zjawisk fizycznych mających miejsce podczas złożonych procesów przemysłowych, jak również na ich monitorowanie oraz kontrolę. W większości zastosowań technik tomograficznych pierwszym etapem pozyskiwania informacji na temat stanu procesu przemysłowego jest rekonstrukcja obrazu tomograficznego. Jednak swoje zalety tomografia uwidacznia w momencie zastosowania metod analizy i przetwarzania obrazów. Artykuł ten prezentuje aplikację z zaimplementowanymi metodami analizy i przetwarzania obrazów zaadaptowanymi na potrzeby badań przepływu pneumatycznego materiałów sypkich.

EN

The process tomography is a measurement technique, which allows to visualise material distribution inside sensor space in form of 2D or 3D images. The visualization information obtained with aid of tomography system, particularly the analysis and processing of images, enables investigation of spatial-temporal physical phenomena during complex and dynamic industrial processes as well as their monitoring and eventually control. In most cases the first step of information gathering about process is image reconstruction. However the application of process tomography is even more valuable and clearly visible when image analysis is conducted afterwards. This paper presents original software developed for tomographic image analysis. There are new algorithms dedicated for pneumatic conveying process study implemented in this application.