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1

Post-processing in multi-material 3D printing

Brancewicz-Steinmetz E., Sawicki J.

Journal of Achievements in Materials and Manufacturing Engineering

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2023

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Vol. 117, nr 1

5--14

EN

Purpose: This study aims to investigate the adhesion of combining two materials with different properties (PLA-TPU and TPU-PLA) printed in FFF (fused filament fabrication) with post-processing treatments. Design/methodology/approach: The scope of the study includes making variants of samples and subjecting them to three different post-printing treatments. After processes, shear tests were conducted to determine the adhesion. Findings: The post-printing treatment results in a stronger inter-material bond and increased adhesion strength; the best average shear strength results were achieved for annealing without acetone and for PLA/TPU samples for treatment in cold acetone vapour. Research limitations/implications: In the study, adhesion was considered in the circular pattern of surface development. Practical implications: Reinforcement of the biopolymer broadens the possibilities of using polylactide. Examples of applications include personalised printing items, where the elastomer will strengthen the polylactide. Originality/value: These studies aim to promote the use and expand the possibilities of using PLA biopolymer. The strength properties of printouts from different materials are often insufficient, hence the proposal to use post-printing processing.

2

Operation of ASG-EUPOS POZGEO sub-service in the event of failure of reference stations used in the standard solution – case study

Kudas Dawid, Wnęk Agnieszka

Geomatics, Landmanagement and Landscape

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2019

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no. 4

59--71

EN

The validation of the work of computational algorithms operating within the positioning system services under unusual measuring conditions is an important part of the entire system. Particularly noteworthy conditions are failures of reference stations forming the examined station network. The article evaluates the operation of the algorithm implemented to the POZGEO sub-service of the ASG-EUPOS system in the event of failure of reference stations used in the standard determination of the coordinates of the selected spatial point. The research material consisted of 117 days of continuous determination of the position of the selected spatial point using 1 hour of GPS static observations. Reports on the procedure of determining the position in the post-processing mode in POZGEO sub-service of static satellite observations were used to simulate the reduction of the number of tie vectors in coordinates’ determination method. The resistance of the automatic post-processing algorithm to failure of parts from the standard reference stations used was assessed.

3

The realized concept of variable chemical composition fuel gas supply systems, for internal combustion engines

Brzeżański M., Mareczek M., Marek W., Papuga T., Sutkowski M.

Combustion Engines

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2017

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R. 56, nr 3

108--114

EN

The article presents the results of industrial research, of mixer and injection gas supply systems of internal combustion engines, for fuel gas time-varying chemical composition. The publication presents an innovative injection system working by patent PL 222462, and obtained operating characteristics of power generators with the implemented system. In addition for comparison, the article presents the results of research a generator set with implemented an innovative system of the mixing gas fuel supply, with variable chemical composition.

4

Pipelined pseudo-random number generator with the efficient post-processing method

Dąbal P.

International Journal of Microelectronics and Computer Science

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2015

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Vol. 6, nr 2

43--48

EN

This brief proposes a novel architecture of the chaotic pseudo-random bit generators (PRBGs) based on the chaotic nonlinear model and pipelined data processing. We investigated PRBG built on the chaotic logistic map and frequency dependent negative resistances (FDNR). A significant enhancement in terms of output throughput has been achieved by combining the advantages of pipelining with post-processing based on fast logical operations like bit shifting and XOR. The proposed method has been implemented using programmable SoC Zynq device from Xilinx. We verified output pseudo-random bit stream by standard statistical tests NIST SP800-22. We also present detailed comparison of the proposed post-processing method with the methods reported previously by the other authors. In particular, we compared the maximum output throughput and amount of total logical resources required by PRBG implementation in the programmable SoC device. For PRBGs based on the logistic chaotic map and frequency dependent negative resistance (FDNR) we obtained speed-up factors equal to 33% and 14%, respectively. By composing the output stream of 3 data channels in PRBG with FDNR element, we get the maximum throughput equal to 38.43 Gbps. That is significantly greater comparing to the chaotic PRBGs described so far.

5

Algorithms variants of elaboration of the precise gnss network established for geodetic service of building of the mining facility

Mielimąka R., Siejka Z.

Management Systems in Production Engineering

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2014

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nr 4 (16)

168--171

EN

The article presents the problem of the usage of post-processing services of the ASG-EUPOS system on the example of GNSS network established for geodetic service of building of the inclined drift, to make coal deposit accessible, and also building associated objects. For the purpose of geodetic service of construction realization network was established outside the planned objects. The network consists of six new ground points and four control points belonging to ASG-EUPOS network. Simultaneous, static measurements of the network were performed in three-hour observation session, using multi-frequency and multi-system satellite receivers – Trimble R8. The paper presents three variants of post-processing of the observation results. Calculations were performed using POZGEO-D service and geodetic software package GEONET. The results of the calculation process revealed, that homogeneous vector networks should be adjusted on the ellipsoid or in the geocentric system. Model of adjustment of the vector network on the plane adopted in the GEONET software package should not be applied for elaboration of this type of network (long reference vectors more than 50km).

PL

Artykuł podejmuje problematykę wykorzystania serwisów postprocessingu systemu ASG-EUPOS na przykładzie sieci realizacyjnej założonej dla geodezyjnej obsługi budowy upadowej łączącej powierzchnię terenu ze złożem węgla kamiennego oraz obiektów jej towarzyszących. Dla potrzeb geodezyjnej obsługi budowy tej inwestycji założono na zewnątrz planowanych obiektów sieć realizacyjną złożoną z sześciu nowo założonych punktów ziemnych i czterech punktów nawiązania należących do satelitarnej sieci ASG-EUPOS. Jednoczesny, statyczny pomiar tej sieci przeprowadzono za pomocą wieloczęstotliwościowych i wielosystemowych odbiorników satelitarnych firmy Trimble model R8 GNSS, w trzygodzinnej sesji obserwacyjnej. W pracy przedstawiono trzy warianty numerycznego opracowania wyników tak pomierzonej sieci GNSS. Obliczenia wykonano z wykorzystaniem serwisu POZGEO-D oraz pakietu programów geodezyjnych GEONET. Wyniki przeprowadzonych obliczeń pozwoliły stwierdzić, że jednorodne sieci wektorowe należy wyrównywać na elipsoidzie albo w układzie geocentrycznym. Przyjęty w pakiecie programów GEONET model wyrównania sieci wektorowej na płaszczyźnie nie powinien być stosowany do opracowania tego typu sieci (długie wektory nawiązania powyżej 50km).

6

Method for determining the formation of shrinkage defects in the castings

Dyja R., Sczygiol N.

Archives of Foundry Engineering

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2011

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Vol. 11, iss. 4

35-40

EN

Simple simulations of solidification of metals and alloys generally provide results for determining the temperature distribution in a given time or solidification time for the specific locations of the casting. These data allow to unambiguously determine the position of thermal centers. However, knowledge about the location of thermal centers is not synonymous with the information about the location of any shrinkage defects in the casting, because the physical behaviour of molten metal should be still considered. This paper presents authors' own method of predicting the formation of shrinkage defects in the castings, basing on solidification simulation results, taking into account the basic rules of behaviour of the molten metal. The effectiveness of the method has been tested on the basis of example simulations performed for the flat shape of the casting inlet systems. The advantage of the method is that it requires little additional computational effort. The article is summarized by conclusions reached on the basis of simulations, as well as the program for further work containing possible improvements of the algorithm.

7

Przetwarzanie końcowe w segmentacji obszarowej obrazów barwnych

Palus H.

Przegląd Elektrotechniczny

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2008

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R. 84, nr 9

96-99

PL

W artykule przedstawiono procedury przetwarzania końcowego dopasowane do segmentacji obszarowej obrazów barwnych, reprezentowanej przez technikę nieziarnistego rozrostu obszaru. Szczególnie przydatne okazało się usuwanie małych obszarów poprzez dołączanie ich do obszarów sąsiednich o największej powierzchni. Pokazano możliwość stosowania tej procedury do usuwania odblasków przeszkadzających w procesie segmentacji.

EN

In this paper the postprocessing procedures adapted to the region-based colour image segmentation, represented by unseeded region growing technique, are presented. The removal of small regions from segmented images by merging them to the neighbouring regions with the largest areas was particularly useful. The possibility of using this procedure to removing of highlights that disturbing segmentation process, has been proved.