PL
 |
EN
Preferencje help
Polish version English version Język
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 9

Liczba wyników na stronie
first rewind previous Strona / 1 next fast forward last
Wyniki wyszukiwania
help Sortuj według:

help Ogranicz wyniki do:
first rewind previous Strona / 1 next fast forward last
1
Content available Research on low density polyethylene (LDPE), recycled by advanced thermal analysis (DSC, TG)
Siwczyk Bartosz, Schlafka Paweł, Sąsiadek Michał, Woźniak Waldemar
International Journal of Applied Mechanics and Engineering
|
2023
|
Vol. 28, no. 2
113--124
EN
This article presents the issue of recycling and maintaining the processing properties of materials made of plastics. For this purpose, samples from recycled, low-density, polyethylene were tested. The impact of the use of dyes and surface printing on the lifecycles of material and its quality was examined. For this purpose, an analysis was carried out using differential scanning calorimetry and thermos-gravimetry. It was found that the use of dyes may affect the quality of the material and increase the disposal costs of pre-used materials.
2
Content available Investigation into the Flow of Gas-Solids during Dry Dust Collectors Exploitation, as Applied in Domestic Energy Facilities - Numerical Analyses
Maćkowiak Albert, Kostrzewski Mariusz, Bugała Artur, Chamier-Gliszczyński Norbert, Bugała Dorota, Jajczyk Jarosław, Woźniak Waldemar, Dombek Grzegorz, Nowak Karol
Eksploatacja i Niezawodność
|
2023
|
Vol. 25, no. 4
art. no. 174095
EN
The paper presents the results related to the simulation of dust-separating tangential cyclones: single cyclones of various geometries, and an axial multi-cyclone with fixed geometries and components. Its goal was to apply low-cost analyses for cyclones in industrial realization. Therefore, the presented research was applied with simulation methodology as a problem of Computational Fluid Dynamics. The models were analyzed using SolidWorks Flow Simulation software. The presented dust collectors are real-life objects, applied in industrial facilities. For a multi-cyclone, the increase in the number of blades, from 5 to 8, together with the change in the angle of a blade’s pitch i.e., 30° and 45°, resulted in dust concentration along the internal walls from just 10% for 5 blades up to c.a. 37.5% for 6 blades, and c.a. 50% for 8 blades, whereas the dust concentration in the device’s central part equals c.a. 20% for the last option. The model validation draws attention to the potential applicability of the software in flow issues alongside common and more complex numerical environments.
3
Content available A New Effective Algorithm for Mechanical Assembly Sequence Planning
Sąsiadek Michał, Niedziela Maciej, Woźniak Waldemar, Jachowicz Tomasz, Mikušová Nikoleta
Advances in Science and Technology. Research Journal
|
2023
|
Vol. 17, no 5
56--67
EN
This paper presents a new approach for searching the most favourable mechanical assembly sequence. The proposed method is described and its basic modules are presented. The concept is based on the assumption that the method should help the engineer in specifying the best assembly sequence with the short possible time calculation, taking into account the principles of design for assembly at an early stage of development of the product design. The algorithm for generating an accurate assembly sequence was described in detail and its application on real-life example was presented.
4
Content available SEVESO III Directive – Information on Establishments with a High or Increased Risk of a Major Industrial Accident
Gabryelewicz Izabela, Wędrychowicz Maciej, Woźniak Waldemar, Besta Petr
Rocznik Ochrona Środowiska
|
2022
|
Tom 24
383--392
EN
The article presents the history of the development, and the reasons for the creation of the SEVESO Directive, with particular emphasis on the latest Directive 2012/18 / EU of the European Parliament and the Council. The SEVESO III directive imposes detailed requirements on the plant operators regarding their control against major accident hazards related to dangerous substances. Individual countries of the European Union apply various requirements (following SEVESO III or more rigorous ones) for industrial plants. In Poland, the requirements of the SEVESO III Directive have been implemented in the Environmental Protection Act, and its executive acts. The SEVESO III Directive requires that the citizens of a given country have access to information about high and increased-risk establishments. In Poland, this requirement is met through the website www.mapy.geoportal.gov.pl. People can find information on establishments posing a risk of a serious industrial accident. The article presents how to use the portal and what information can be obtained there.
5
Content available Ecological Aspects in the Process of Turning Cast Iron with Coated Tools
Jenek Mariusz, Ociepa Michał, Woźniak Waldemar, Vilamová Šárka, Švecová Eva
Rocznik Ochrona Środowiska
|
2022
|
Tom 24
360--370
EN
The article presents the research results on the influence of the PVD coating on the cutting tool on the surface roughness and energy consumption in the cast iron turning process. It was shown that using coated tools leads to obtaining a surface qualitatively corresponding to the ground surface and to reducing the power consumption of the machine tool. In addition, the process itself, carried out without a cooling and lubricating liquid, is more eco-friendly, as it excludes its use, disposal and negative environmental impact.
6
Content available Studies on the Mechanical Properties of C45 Steel with Martensitic Structure after a High Tempering Process
Woźniak Waldemar, Sąsiadek Michał, Jachowicz Tomasz, Edl Milan, Zając Paweł
Advances in Science and Technology. Research Journal
|
2022
|
Vol. 16, no 3
306--315
EN
This article describes the studies of the mechanical properties of the martensitic structure of C45 steel, obtained as a result of heat treatment. This steel was subjected to high tempering, within the temperature range of 500 ÷ 700°C (every 50°C) and for various exposure times, from 15 minutes to 23 hours. Moreover, martensitic steel was subjected to tests by quenching at a temperature of 850°C for 20 minutes and then tempering it for 1 hour, within the temperature range of 50 ÷ 800°C (every 50°C). The resulting steel samples were subjected to strength tests, that is, to tensile and hardness tests and also to tests on the micro-structure. The results of these studies are presented and discussed, in detail, in terms of their practical application.
7
Content available Environmental Loads Resulting from Manufacturing Technology
Gabryelewicz Izabela, Lenort Radim, Wędrychowicz Maciej, Krupa Patryk, Woźniak Waldemar
Rocznik Ochrona Środowiska
|
2021
|
Tom 23
613--628
EN
The study of environmental loads resulting from manufacturing technology is of great importance for environmental protection. Applying the principles of sustainable development means "a way of farming in which meeting the needs of the present generation will not reduce the chances of meeting the needs of future generations." Faced with such a challenge, the product must be assessed throughout its entire life cycle (LCA). From the available technologies and materials, one should choose those that are least harmful to the environment. In order to make a correct choice, it is necessary to know and understand the technological processes and phenomena that take place in them. Using off-theshelf LCA applications, without knowing basic knowledge of manufacturing technology, can bias the results. The aim of the article is to present benefits resulting from the environmental assessment of manufacturing processes.
8
Content available The effect of hydroxyapatite coating with silver nanoparticles on osseointegration of titanium implants
Sulej-Chojnacka Joanna, Woźniak Waldemar, Andrzejewski Daniel
Engineering of Biomaterials
|
2020
|
Vol. 23, no. 154
9--15
EN
During the implantation surgery, an infection associated with the biofilm formation may occur. Both the type of the introduced material as well as the implant osseointegration largely determine the effectiveness of bone defect treatment. The materials research is increasingly focusing on improving the osseointegration process. A bacterial biofilm can form on any surface of the artificial organ that has been introduced into the body or surrounding tissues. A bacterial infection is one of the most serious complications of implantology surgery leading to serious physiological damage. As proved in the literature, a solution that can prevent bacterial infections is to modify the implant surface by applying an antibacterial coating, while maintaining the material biocompatibility. The article presents the tests results of prototype implants with hydroxyapatite coatings obtained via plasma spraying on titanium surfaces. The resulting coatings were enriched with silver nanoparticles, the content of which was about 2%. The animal model are New Zealand rabbits. The implants were placed in the femur of the animal. The amount of released ions and the force of pulling the implants from the bone were determined. The binding strength between the joint surface and the implant was determined by the mechanical blocking and biological binding of growing bone tissue. In addition, the surface structure of the obtained implants was evaluated. It has been shown that the surface modification of the implants affected the obtained stabilization value, as compared to the implants surface coated only with hydroxyapatite.
9
Content available remote Wybrane metody wspomagające wzrost efektywności ekonomicznej zleceń transportowych pozyskiwanych z elektronicznych giełd transportowych
Woźniak Waldemar, Niedziela Maciej, Stryjski Roman, Mielniczuk Janusz
Prace Naukowe Politechniki Warszawskiej. Transport
|
2019
|
z. 127
93--103
PL
W artykule przedstawiono problem badawczy rozważany w kontekście analizy i doboru algorytmów optymalizujących stosowanych do rozwiązania zadań przydziału pojazdów do zleceń transportowych oraz pomiaru ich efektywności ekonomicznej. Do analizy wykorzystano dwa zestawione i porównywane ze sobą algorytmy optymalizacyjne. Pierwszy - algorytm węgierski, będący klasycznym algorytmem transportowym wykorzystywanym w większości systemów TMS (ang. Transportation Management System), drugi zaś, autorski, bazujący na metodach heurystycznych i zaimplementowany w wybranych firmach transportowych pod nazwą: algorytm poprawy.
EN
The article presents the research problem was considered in the context of the analysis and selection of the optimisation algorithms used, in order to solve the task of assigning vehicles to transport orders and also in the context of their economic efficiency. Two optimisation algorithms were compared and used for the present analysis. The first is the Hungarian Algorithm, which is a classic transport algorithm used in most TMS systems, that is, Transportation Management Systems. The second was developed proprietary, based on heuristic methods and implemented in selected transport companies under the name: improvement algorithm.
first rewind previous Strona / 1 next fast forward last
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.