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article

Exploitation of industrial solid wastes for preparing zeolite as a value-added product and its kinetics as adsorbent for heavy metal ions

Reham Mohamed Abdel-Hameed, Elsayed A. Abdel-Aal, Fatma E. Farghaly, Ibrahim A. Ibrahim, more

Physicochemical Problems of Mineral Processing > 2021 > Vol. 57, iss. 1 > 87–-99

Aluminum and fumed silica as solid industrial wastes were converted to zeolite NaPas a value-addedproduct without any template. The hydrothermal process was optimized using static autoclave. The crystallization was carried out at 100, 120 and 150°C for 24, 48 and 72 h. The prepared zeolite of Si:Al ratio of 1.2 was characterized using X-ray Diffraction (XRD), Scanning Electron Microscope (SEM) provided...

article

Preparation of amphoteric modified bentonite from calcium-based bentonite for adsorption of anionic dye. The importance of sodium-modification pretreatment

Hang Yin, Zijie Ren, Huimin Gao, Weiyi Han, more

Physicochemical Problems of Mineral Processing > 2021 > Vol. 57, iss. 1 > 1--17

To understand the influence of sodium-modification pretreatment on the adsorption of anionic dye by amphoteric modified bentonite, three kinds of adsorbent materials, including sodium-modified bentonite, amphoteric modified calcium-based bentonite and amphoteric modified bentonite pretreated by sodium modification, were firstly synthesized and characterized, and afterwards their adsorption performance...

article

Thermodynamic analysis of the influence of potassium on the thermal behavior of kaolin raw material

Macaria Hernández-Chávez, Marissa Vargas-Ramírez, Ana Maria Herrera-González, Jesús García-Serrano, more

Physicochemical Problems of Mineral Processing > 2021 > Vol. 57, iss. 1 > 39–-52

The mineralogy and thermal properties of two kaolin clay samples from Agua Blanca (Hidalgo-México) were determined by XRD, SEM-EDS, TGA-DSC techniques. Kaolin clay A contains a higher Al2O3 and lower impurities (K2O, TiO2, Fe2O3) amount than kaolin clay B, while the SiO2 amount is similar for both kaolin clays. A theoretical approach was carried out by a thermodynamic analysis considering the chemical...

article

Zastosowanie polimerów naturalnych do uszlachetniania materiału siewnego

Grażyna K. Korbecka-Glinka, Maria Wiśniewska-Wrona, Ewa Kopania

Polimery > 2021 > T. 66, nr 1 > 11—20

Biopolimery z grupy polisacharydów, dzięki swoim właściwościom fizykochemicznym, podatności na modyfikację chemiczną i biodegradację oraz wysoką bioaktywność, są wykorzystywane do uszlachetniania materiału siewnego roślin uprawnych. Polimery naturalne, takie jak: chitozan, alginian, celuloza, galaktoglukomannany, lignina oraz guma gellanowa mogą być stosowane jako substancje wiążące w otoczkowaniu...

article

Torsional strength tests of spline connections made of polymer materials

Mariusz Oleksy, Rafał Oliwa, Katarzyna Bulanda, Grzegorz Budzik, more

Polimery > 2021 > T. 66, nr 1 > 52--55

This work is a continuation of the publication [1], in which the torsional strength tests of samples made of polymer materials, loaded with torsional moment, which more and more often can be made with the use of incremental technologies, were carried out. The designed proprietary test stand, which was described in the publication [1], was used. A series of preliminary studies on the torsion of fittings...

article

Selected performance indices for assessment of polypropylene susceptibility to dyeing by pigments of different UV resistance

Marek Bieliński, Artur Kościuszko, Katarzyna Smolińska

Polimery > 2021 > T. 66, nr 1 > 44--51

This study presents an assessment of the effects of usage time for polypropylene (PP) experimental samples including those dyed with pigments of different UV resistance. A standard double cavity mold was used to create the samples by injection molding. Selected indices were analyzed in terms of color change (UV resistance of pigments), and UV radiation resistance of a PP polymer medium. The experiment...

article

The technology of designing plastic windows and their transport from Poland since 1990

Rafał Karaś

Polimery > 2021 > T. 66, nr 1 > 21--29

PVC window and door constructions are more and more popular in architecture. The profile manufacturing technology, structure and materials are constantly being modified. The Author analyses technological changes that have been implemented within the period of the last 20 years on the basis of Polish market experience, where the technology of PVC window and door production was hardly known, in relation...

article

Correlation of manufacturing defects and impact behaviors of kenaf fiber reinforced hybrid fiberglass/Kevlar polyester composite

M. J. Suriani, S. M. Sapuan, C. M. Ruzaidi, J. Naveen, more

Polimery > 2021 > T. 66, nr 1 > 30--35

In this study, the impact properties of kenaf fibre reinforced hybrid fiberglass/Kevlar polymeric composite was investigated. In this study, a new fiber arrangement based on kenaf bast fiber as reinforcement to the hybrid fiberglass/Kevlar fiber and polyester as matrix used to fabricate the hybrid polymeric composite. Five different types of samples with different of kenaf fiber content based on volume...

article

Geometric analysis of injection-molded polymer gears

Jadwiga Pisula

Polimery > 2021 > T. 66, nr 1 > 56--62

Properties of polymer gears were tested using coordinate measurement methods. This study is a follow-up to research on geometric accuracy of gears manufactured by injection molding. Spur gears were measured on a coordinate measuring machine running the GINA software by Klingelnberg. Measurement results were output in the form of measurement sheets which included values required in the DIN 3962 standard...

article

Effect of fiber content and their hybridization on bending and torsional strength of hybrid epoxy composites reinforced with carbon and sugar palm fibers

N. M. Z. Nik Baihaqi, A. Khalina, N. Mohd Nurazzi, H. A. Aisyah, more

Polimery > 2021 > T. 66, nr 1 > 36--43

This study aims to investigate the effect of fiber hybridization of sugar palm yarn fiber with carbon fiber reinforced epoxy composites. In this work, sugar palm yarn composites were reinforced with epoxy at varying fiber loads of 5, 10, 15, and 20 wt % using the hand lay-up process. The hybrid composites were fabricated from two types of fabric: sugar palm yarn of 250 tex and carbon fiber as the...

article

Bioresorbable polymeric materials – current state of knowledge

Kamila Wiśniewska, Zbigniew Rybak, Marcin Wątrobiński, Marcin H. Struszczyk, more

Polimery > 2021 > T. 66, nr 1 > 3--10

Bioresorbable materials are used in medicine for fixing, correcting or stabilizing bones in various anatomical areas, and the market for such materials is growing rapidly worldwide. The use of polymers for their production is associated with the ability to control their properties. They are prepared from bioresorbable materials with variable surface, geometry, porosity, as well as mechanical and surface...

article

The Shooting Tests of Target Perforating Ability, Performed on Cast Concrete Cylinders

Łukasz Habera, Kamil Hebda, Piotr Koślik, Tomasz Sałaciński

Central European Journal of Energetic Materials > 2020 > Vol. 17, no. 4 > 584--599

In this paper, the first results of the applicability of shaped charges with a single liner, of a conical and of an axially-symmetric elliptical shape, are compared. The shaped charges were of an analogous type. The outer diameter and the height of the shaped charges were 39 and 42 mm, respectively. The mass of the explosive (flegmatized hexogen) in these charges was 27 g. The charges with the conical...

article

Determination of contact pattern for double enveloping worm gear

Piotr Połowniak, Mariusz Sobolak, Adam Marciniec

Advances in Manufacturing Science and Technology > 2020 > Vol. 44, nr 4 > 145--154

The paper presents the method of determining geometric contact pattern by using the direct computer-aided design (CAD) method for ideal globoid worm gear in which mounting deviations are considered. The tooth contact analysis was performed for all cycle of worm rotation. Based on the results of temporary contact pattern, graphical characteristics of the contact area size depending on worm position...

article

Effect of grain size on the physicomechanical properties

C. V. Ossia, A. Big-Alabo, E. O. Ekpruke

Advances in Manufacturing Science and Technology > 2020 > Vol. 44, nr 4 > 135--144

In this study, locally available waste coconut (Cocos nucifera) shells (CSs) were investigated as possible replacement for asbestos-based brake pads. The CS-based brake pad was tested for its physicomechanical properties and compared with a commercial brake pad used as control sample. The results showed that (a) an improved interfacial bonding between the CS particles and the binder as the grain size...

article

The replication method to analyze roughness of shaft, tool, and grinding wheel microgeometry

Paulina Szawara, Robert Ostrowski

Advances in Manufacturing Science and Technology > 2020 > Vol. 44, nr 4 > 129--133

This article presents the possibility of using the replication method to measure selected parameters of the surface geometry. The results of the tests obtained while measuring the replica and surface of the tested object are presented. The obtained results indicate the suitability of using RepliSet F5 to measure the roughness parameters (Ra and Rz), microgeometry tool, and grinding wheel. It has been...

article

The Use of Virtual Reality for Training in Securing the Functioning of Critical Infrastructure

Andrzej Grabowski, Mieszko Wodzyński

Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa > 2020 > Vol. 11, Nr 4 (42) > 73--82

Our national security, economic prosperity and national welfare depend on a set of highly interdependent elements of critical infrastructure. Examples of critical infrastructure facilities include the national electricity grid, oil and gas systems, telecommunication and information networks, transportation networks, water systems and banking and financial systems. Given their importance, it is crucial...

article

Study on Transformer JED Cap Actuation Systems in the Field of Very Strong Electromagnetic Disturbances

Andrzej M. Faryński, Tomasz Brodniewicz, Jarosław Dębiński, Łukasz Słonkiewicz, more

Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa > 2020 > Vol. 11, Nr 4 (42) > 45--60

This work presents the results of research on the influence of strong external electromagnetic fields on the operation of JED spark caps activated by transformer systems. The tests were carried out in order to determine the conditions of safe use of JED caps installed in control systems of generators producing electric current pulses using the principle of an explosive magnetic field cumulation [1]...

article

LOOK Container Systems for the African Market

Katarzyna Burnat

Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa > 2020 > Vol. 11, Nr 4 (42) > 93--104

The light observation-protective container (LOOK) is intended for security and protection of soldiers/officers performing observation missions, defence and control tasks at checkpoints, military bases or other important strategic locations. It increases the level of protection of staff performing observation and defence tasks thanks to the container's armouring, technical means of observation in both...

article

Statistical Analysis of the Results of Test Artillery Tracers

Dariusz Ampuła

Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa > 2020 > Vol. 11, Nr 4 (42) > 9--26

A statistical analysis of multiyear laboratory test results of artillery tracers number 8 is presented in this article. This analysis was aimed at testing the impact of a natural ageing process on quality indicators during the long-time storage of these tracers. The influence of storage time on taking a diagnostic decision, relating to quality of lots after the conducted laboratory tests and on different...

article

Effect of Changing the Parameters of the Multi Jet Fusion (MJF) Process on the Spatial Objects Produced

Maciej Cader, Wojciech Kiński

Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa > 2020 > Vol. 11, Nr 4 (42) > 61--72

This paper describes the principle of operation of Multi Jet Fusion (MFJ) technology in detail. Hybrid strength tests were carried out using an INSTRON 5967 universal testing machine controlled by the Bluehill 3 program and coupled with the ARAMIS measurement system (GOM, Gmbh), enabling the monitoring of deformations in three axes, using a system of high-speed cameras. The results are given of the...

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Exploitation of industrial solid wastes for preparing zeolite as a value-added product and its kinetics as adsorbent for heavy metal ions

Preparation of amphoteric modified bentonite from calcium-based bentonite for adsorption of anionic dye. The importance of sodium-modification pretreatment

Thermodynamic analysis of the influence of potassium on the thermal behavior of kaolin raw material

Zastosowanie polimerów naturalnych do uszlachetniania materiału siewnego

Torsional strength tests of spline connections made of polymer materials

Selected performance indices for assessment of polypropylene susceptibility to dyeing by pigments of different UV resistance

The technology of designing plastic windows and their transport from Poland since 1990

Correlation of manufacturing defects and impact behaviors of kenaf fiber reinforced hybrid fiberglass/Kevlar polyester composite

Geometric analysis of injection-molded polymer gears

Effect of fiber content and their hybridization on bending and torsional strength of hybrid epoxy composites reinforced with carbon and sugar palm fibers

Bioresorbable polymeric materials – current state of knowledge

The Shooting Tests of Target Perforating Ability, Performed on Cast Concrete Cylinders

Determination of contact pattern for double enveloping worm gear

Effect of grain size on the physicomechanical properties

The replication method to analyze roughness of shaft, tool, and grinding wheel microgeometry

The Use of Virtual Reality for Training in Securing the Functioning of Critical Infrastructure

Study on Transformer JED Cap Actuation Systems in the Field of Very Strong Electromagnetic Disturbances

LOOK Container Systems for the African Market

Statistical Analysis of the Results of Test Artillery Tracers

Effect of Changing the Parameters of the Multi Jet Fusion (MJF) Process on the Spatial Objects Produced

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