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    Wyświetlanie 1-8 z 8
    Tytuł:
    Impact of Impurities of Polypropylene and Silicone Inclusions on the Properties of Polyamide 6.6 Regranulates Derived from the Re-Processing of Airbags
    Autorzy:
    Stachowiak, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/2106560.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    recycling
    composites
    polyamide 6.6
    MFR
    mechanical properties
    Opis:
    The following article presents the results of selected properties of regranulates of polyamide 6.6, regranules of polyamide contaminated with polypropylene and regranules of polyamide contaminated with silicone. The tested materials came from the reprocessing of polyamides 6.6 originally derived from production of airbags from renowned world producers (material for the research came from production waste). The results of examination were referred to regranulates of uncontaminated polyamide but also obtained from waste from the production of these airbags. The influence of impurities on properties of regranulates such as their density and melt flow index was assessed. The tests allowed to show a significant impact of impurities on the density but above all on the mass and volume flow rate index which ranged from 47 to 116 g/10 min. In the case of standardized test specimens selected thermal and mechanical properties were analyzed. Differential scanning calorimetry was used to assess the impact of impurities on the thermal properties of polyamides, allowing primarily identification of materials and impurities (especially polypropylene) as well as characteristic temperatures and the enthalpy of melting of the materials being analyzed. The mechanical properties were assessed using a DMA device. DMA research allowed to determine changes in mechanical properties in a wide temperature range of tested materials. It allowed to obtain full characteristics of changes in material stiffness under the influence of two factors, i.e. temperature and content of impurities, like polypropylene or silicone.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 2; 455--463
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Intelligent management in the age of Industry 4.0 – an example of a polymer processing company
    Autorzy:
    Łukasik, Katarzyna
    Stachowiak, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/407205.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    intelligent manufacturing
    Industry 4.0
    modern technologies
    polymer processing company
    Opis:
    In the article, the significance and essence of management of intelligent manufacturing in the era of the fourth industrial revolution has been presented. The current revolution has a large impact on the operation of the company. Through the changes resulting from the application of modern technologies, production processes are also undergoing revolutions, which results in changes in such indicators of business development. Management of intelligent manufacturing is also a challenge for socially responsible activities; due to solutions of Industry 4.0, enterprises directly and indirectly influence environmental protection, which results in benefits for all mankind. In the article, the analysis and assessment of management of intelligent manufacturing, using modern technologies during the production process, has been carried out, with particular emphasis on the components of management such as: monitoring, control, autonomy, optimization. Moreover, the impact of the above components of management on changes in the following indicators (KPI – Key Performance Indictors) has been evaluated, i.e. (1) quality, (2) rapidity of the production process implementation, (3) performance and (4) productivity, (5) decrease in waste generated during the technological process and (6) amount of consumed electricity. For the purposes of conducting the research, a case study has been used, developed due to the information shared by the company manufacturing machinery and equipment for the polymer processing industry, in which intelligent solutions of Industry 4.0 are being applied. The presented article is a significant contribution to the current development of knowledge in the field of implementing Industry 4.0 solutions for polymer processing. The article is a combination of theoretical and practical knowledge in the field of management and practical industrial applications. It refers to the most current research trends.
    Źródło:
    Management and Production Engineering Review; 2020, 11, 2; 38-49
    2080-8208
    2082-1344
    Pojawia się w:
    Management and Production Engineering Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of the reactance of rail vehicles wheelsets
    Autorzy:
    Garczarek, Adam
    Woźniak, Krystian
    Olejniczak, Tomasz
    Waśkowicz, Radosław
    Stachowiak, Dorota
    Powiązania:
    https://bibliotekanauki.pl/articles/33343772.pdf
    Data publikacji:
    2023-11-30
    Wydawca:
    Sieć Badawcza Łukasiewicz - Poznański Instytut Technologiczny
    Tematy:
    resistance
    impedance
    reactance
    traction vehicles
    measurement methodology
    wheelset
    Opis:
    The article presents issues related to the determination of resistance, impedance, and reactance of rail vehicles wheelsets in relation to applicable standards and regulations. The methodology of conducting this type of test is discussed, and a configured test stand is presented to measure the resistance and impedance of the wheelsets. The uncertainty budget for this type of testing is discussed. Exemplary measurement results are presented and analyzed.
    Źródło:
    Rail Vehicles/Pojazdy Szynowe; 2023, 1-2; 32-37
    0138-0370
    2719-9630
    Pojawia się w:
    Rail Vehicles/Pojazdy Szynowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Motives for the usage of collaborative fashion consumption online platforms
    Autorzy:
    Michalak, Szymon
    Bartkowiak, Paweł
    Ankiel, Magdalena
    Olejniczak, Tomasz
    Stachowiak-Krzyżan, Magda
    Powiązania:
    https://bibliotekanauki.pl/articles/11364531.pdf
    Data publikacji:
    2022-06-30
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
    Tematy:
    collaborative fashion consumption
    sharing economy
    consumer behaviour
    motives
    structural equation model
    sustainable consumption
    Opis:
    In recent years, there has been a noticeable increase in consumer interest in participating in the sharing economy. One of the markets in which this is particularly visible is the clothing market. Dynamic technological progress and the virtualisation of life have contributed to the creation of applications with which consumers can buy, exchange or borrow clothes. The use of this type of application is treated as a manifestation of sustainable consumption. The main aim of the article is to determine the influence of selected motives on the attitudes towards these applications and their use. The article discusses the results of the research conducted in 2021 on a sample of 412 respondents. Confirmatory factor analysis and structural equation modelling were used in the process of analysing the results. The research results suggest that the most important motives for using the discussed applications were economic and utility, with their impact on attitudes towards these applications and the willingness to use them confirmed. Social motives turned out to be the lowest-rated group of determinants. Moreover, their negative impact on both attitudes towards the application and the willingness to use it was confirmed. Ecological motives turned out to be relatively important determinants of using the discussed solutions. Their influence on attitudes towards the application and consumption behaviour was confirmed.
    Źródło:
    Marketing Instytucji Naukowych i Badawczych; 2022, 44, 2; 41-66
    2353-8414
    Pojawia się w:
    Marketing Instytucji Naukowych i Badawczych
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Access to vaccination in the Greater Poland (Poland)
    Autorzy:
    Zaprutko, Tomasz
    Kopciuch, Dorota
    Paczkowska, Anna
    Sawicka, Dominika
    Stachowiak, Zuzanna
    Bogdaniec, Patrycja
    Kus, Krzysztof
    Nowakowska, Elżbieta
    Powiązania:
    https://bibliotekanauki.pl/articles/895651.pdf
    Data publikacji:
    2019-02-28
    Wydawca:
    Polskie Towarzystwo Farmaceutyczne
    Tematy:
    poland
    vaccines
    access
    pharmaceutical market
    pharmacies
    Opis:
    Immunization is a very effective health intervention. Moreover, the global vaccines market has been growing rapidly and costs of full children immunization are dramatically higher nowadays than 30 years ago. High vaccine prices may limit affordability of vaccination which is why we attempted an evaluation of availability and affordability of 7 and non-reimbursed vaccines mostly used in children in Poland. The study was conducted between October 2016 and October 2017 using a specially designed anonymous questionnaire comprising three closed-ended questions. The study tool was distributed by direct contact or via the Internet. Eventually, answers from 505 pharmacies from the Greater Poland region and 10 primary care clinics were included. 5 out of 7 vaccines were available in all types of facilities. There were some issues, however, with availability of Bexsero® and Nimenrix®. Considering prices, the highest difference (of more than 100%) was found for Infanrix hexa® and the lowest (38.5%), for Infanrix IPV+HIB®. In 88.17% of pharmacies included, patients were informed about a thermo-insulating package. 48.39% of respondents indicated that such package is free of charge, while in other pharmacies an average price for the package was EUR 0.48. Although availability and affordability of medicines are crucial objectives of the public health policy, it seems that access to vaccines in Poland might be an area for improvement. Thus, prices of non-reimbursed vaccines could be regulated in Poland nationwide. Moreover, to provide trustworthy information concerning vaccination, healthcare decision makers should consider social education about immunization as an important issue.
    Źródło:
    Acta Poloniae Pharmaceutica - Drug Research; 2019, 76, 1; 195-201
    0001-6837
    2353-5288
    Pojawia się w:
    Acta Poloniae Pharmaceutica - Drug Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure-function relationship of serine protease-protein inhibitor interaction.
    Autorzy:
    Otlewski, Jacek
    Jaskólski, Mariusz
    Buczek, Olga
    Cierpicki, Tomasz
    Czapińska, Honorata
    Krowarsch, Daniel
    Smalas, Arne
    Stachowiak, Damian
    Szpineta, Agnieszka
    Dadlez, Michał
    Powiązania:
    https://bibliotekanauki.pl/articles/1044133.pdf
    Data publikacji:
    2001
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    calorimetry
    serine proteases
    structural thermodynamics
    protein inhibitor
    protein-protein recognition
    Opis:
    We report our progress in understanding the structure-function relationship of the interaction between protein inhibitors and several serine proteases. Recently, we have determined high resolution solution structures of two inhibitors Apis mellifera chymotrypsin inhibitor-1 (AMCI-I) and Linum usitatissimum trypsin inhibitor (LUTI) in the free state and an ultra high resolution X-ray structure of BPTI. All three inhibitors, despite totally different scaffolds, contain a solvent exposed loop of similar conformation which is highly complementary to the enzyme active site. Isothermal calorimetry data show that the interaction between wild type BPTI and chymotrypsin is entropy driven and that the enthalpy component opposes complex formation. Our research is focused on extensive mutagenesis of the four positions from the protease binding loop of BPTI: P1, P1', P3, and P4. We mutated these residues to different amino acids and the variants were characterized by determination of the association constants, stability parameters and crystal structures of protease-inhibitor complexes. Accommodation of the P1 residue in the S1 pocket of four proteases: chymotrypsin, trypsin, neutrophil elastase and cathepsin G was probed with 18 P1 variants. High resolution X-ray structures of ten complexes between bovine trypsin and P1 variants of BPTI have been determined and compared with the cognate P1 Lys side chain. Mutations of the wild type Ala16 (P1') to larger side chains always caused a drop of the association constant. According to the crystal structure of the Leu16 BPTI-trypsin complex, introduction of the larger residue at the P1' position leads to steric conflicts in the vicinity of the mutation. Finally, mutations at the P4 site allowed an improvement of the association with several serine proteases involved in blood clotting. Conversely, introduction of Ser, Val, and Phe in place of Gly12 (P4) had invariably a destabilizing effect on the complex with these proteases.
    Źródło:
    Acta Biochimica Polonica; 2001, 48, 2; 419-428
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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