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Influence of Selected Diagnostic Parameters on the Quality of AWJ Cutting Surface

Wala Tomasz, Lis Krzysztof

Advances in Science and Technology. Research Journal

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2022

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Vol. 16, no 1

129--140

EN

The article presents a review of research methods for the cutting process using the abrasive waterjet machining. The focus was on assessing the possibility of monitoring the cutting process based on the parameters available for direct or indirect measurement. An attempt was made to evaluate their influence on the machined surface after treatment with the abrasive cutting method. These parameters include, inter alia, vibrations of the cutting head, force effects on the head support structure and the material to be cut, dynamic properties of the machine support structure and high pressure pumps. As part of the own research, correlation was sought for the registered selected signal characteristics with the cutting parameters responsible for the process course and the parameters related to the obtained machined surface. For this purpose, a model of the deflection angle of the abrasive waterjet was proposed, which qualitatively determines the condition of the surface after cutting. The angle of inclination of the abrasive waterjet is determined on the basis of the registration of the feed force during the cutting process. The research on surface topography was extended by an attempt to determine the surface roughness by measuring vibrations and looking for correlation between the displacements of the cutter head tip and the measured roughness height profile. These tests also allowed the identification of selected frequencies that clearly result from the set parameters of the cutting process. The last stage of the research was to monitor the cutter head behaviour using a deformation sensor as another concept for recording the forces during the cutting process. Finally, the proposed methodology was characterized in the context of its usefulness in the on-line process monitoring and supervision system.

2

Daily patient geometry correction: application of NAL and eNAL protocols

Dąbrowski Andrzej, Zielińska-Dąbrowska Sylwia, Kuszewski Tomasz, Lis Krzysztof

Polish Journal of Medical Physics and Engineering

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2020

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Vol. 26, Iss. 4

181--184

EN

Purpose: To test the NAL and eNAL correction protocols using daily patient setup displacements. Methods and material: In total, the analysis was performed for 749 and 797 kV CBCT images for gynecological and prostate patients, respectively, each of 30 patients. After the planning procedure, patients were set up on the treatment table in the treatment position every day. The on-line correction protocol was applied. KV CBCT images were acquired by means of x-ray lamp mounted orthogonally on Linac. Patient setup displacement was assigned. NAL and eNAL corrections protocols were simulated using daily data from online corrections for these two groups of patients. The overall systematic error and random error were calculated for each direction. Results: For the prostate group, the random errors for daily Raw data (no correction) in LAT, LONG, and VERT directions were 2.0 mm, 1.6 mm, and 3.2 mm, respectively. For NAL and eNAL protocols, they were in the range of 1.8 mm to 3.2 mm. For the gynecological group, the random errors were: for daily Raw data 2.2 mm, 1.7 mm, and 3.2 mm, respectively. For NAL and eNAL protocols, they were in the range of 2.0 to 3.4 mm. For the prostate group, values of systematic errors 1.8 mm, 1.8 mm, and 3.3 mm, respectively for Raw data. For NAL and eNAL protocols, these values were less than 1.8 mm. For the gynecological group, the systematic errors were 2.6 mm, 2.3 mm, and 2.8 mm, respectively, for Raw data. For NAL ana eNAL protocols less than 1.8 mm. For the gynecological group, for Raw data, 45% of the total displacement vectors exceeded 5 mm, whereas only 25% did after the NAL procedure and 29% after the eNAL procedure. For the prostate group, for Raw data, 34% of the total displacement vectors exceeded 5 mm, whereas only 22% did after NAL procedure and 28% after eNAL procedure Conclusions: For gynecological and prostate cancer patients, the NAL and eNAL correction protocols can be safely applied to substantially reduce setup errors.

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Eksperymentalna analiza modalna hybrydowej belki z polimerobetonu zbrojonego

Całka Paweł, Lis Krzysztof

Modelowanie Inżynierskie

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2019

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T. 39, nr 70

10--16

PL

W artykule przedstawiono wyniki eksperymentalnej analizy modalnej innowacyjnej belki wykonanej z materiału kompozytowego zbrojonego prętami stalowymi. Badania miały na celu porównanie właściwości dynamicznych tego rodzaju hybrydowego połączenia do profilu stalowego wypełnionego kompozytem i belki w całości wykonanej z kompozytu.

EN

The paper presents results of experimental modal analysis of hybrid composite beam reinforced with steel rods. The purpose of the research was comparison dynamic properties of this type of connection composite material and steel to steel profile filled with polymer concrete and beam made entirely of composite.

4

Na styku miedzi i grafenu

Lis Krzysztof, Król Magdalena

Cuprum : czasopismo naukowo-techniczne górnictwa rud

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2019

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nr 3

35--42

PL

W artykule przedstawiono zalety i ograniczenia miedzianych przewodów elektrycznych oraz korzyści, wynikające z ich powlekania grafenem. Opisano metody wytwarzania powłok grafenowych na przewodach miedzianych, ze szczególnym uwzględnieniem metody CVD. Ponadto, zaprezentowano założenia projektu „Produkcja warstw grafenowych na przewodnikach miedzianych do zastosowań elektronicznych” (GLC-Connect), finansowanego z programu POIR. W ramach tego projektu zaplanowano opracowanie i budowę dwóch systemów do powlekania grafenem drutu miedzianego i ścieżek elektronicznych metodą CVD.

EN

The article presents the advantages and limitations of copper electric wires as well as the benefits of coating them with graphene. Methods of producing graphene coatings on copper wires with particular emphasis on the CVD method have been described. The project “Manufacturing of graphene layers on copper connections for electronics applications” (GLC-Connect) financed from the SG OP program was generally presented as well. During the project two systems for graphene coating copper wire and electronic paths using CVD method will be created.