Autor: Borowski, Jacek. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Investigating the Effect of Photo-Oxidative Degradation on the Ageing Resistance of the Car Mudflaps Manufactured with Post-Production High-Density Polyethylene Wastes
Autorzy:: Czarnecka-Komorowska, Dorota
Swain, Chandra
Kopeć, Bogdan
Borowski, Jacek
Garbacz, Tomasz
Powiązania:: https://bibliotekanauki.pl/articles/2201788.pdf
Data publikacji:: 2022
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: recycling
crystallinity
mechanical behavior
ageing process
carbonyl index
mudflap
polyethylene
HDPE
Opis:: The paper presents the results of the ageing resistance of automotive mudflaps made of recycled polyethylene blends. The mudflaps were manufactured by a plastic sheet extrusion-calendaring process in Novotech Kostrzyn nad Odrą company. The changes of the mechanical properties in the tensile test and impact toughness test as well as in Shore hardness due to the accelerated aging process were characterized, taking into account the aging sensitivity coefficient (KI), and changes in the structure within the wavenumber range 4000-400 cm-1, taking into account the CI coefficient. The results showed a higher melting point and crystallinity for the recycled HDPE blends during photo-oxidative degradation. Moreover, the results presented decreased tensile strength and ductility, due to macromolecular chain scission caused by oxidation. It was found that the blends of HDPE based on recycled materials are more sensitive to the aging process than virgin HDPE. Finally, it can be concluded that the sensitivity to ageing blends increases with the increase of recycled HDPE content in the HDPE matrix.
Źródło:: Advances in Science and Technology. Research Journal; 2022, 16, 4; 38--47
2299-8624
Pojawia się w:: Advances in Science and Technology. Research Journal
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Methods to Increase the Protective Effectiveness of Add-on Armour made of Perforated Ultra-High-Strength Nanobainitic Steel Plates
Metody zwiększenia skuteczności ochronnej dodatkowego pancerza z perforowanych blach z ultra-wytrzymałej stali nanobainitycznej
Autorzy:: Garbarz, Bogdan
Marcisz, Jarosław
Burian, Wojciech
Kowalski, Aleksander
Borowski, Jacek
Szkudelski, Szymon
Walicki, Marek
Zając, Kamil
Powiązania:: https://bibliotekanauki.pl/articles/2203983.pdf
Data publikacji:: 2023
Wydawca:: Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:: add-on armour
perforated plates
ultra-high-strength nanobainitic steel
dodatkowe opancerzenie
stalowe płyty perforowane
ultrawytrzymała stal nanobainityczna
Opis:: The mechanical properties of industrially produced perforated steel plates are obtained by hardening and low-temperature tempering to produce a martensitic microstructure. Another morphological type of steel microstructure that allows for ultra-high strength and, at the same time, a level of ductility that qualifies it for use in armour is nanobainite. Research into nanobainitic steels has led to the development of plates manufacturing technology at a level that can be implemented in industrial production, and has confirmed the high potential of this material for use as additional armour in the form of perforated plates. This paper reports the results of research aimed at developing a technology for the production of perforated armour plates made of nanobainitic steel, with properties competitive with currently available perforated steel plates on the world market with the highest protective effectiveness under conditions of multi-hit firing tests with small and medium calibre ammunition. The tests were performed on 300 × 260 mm plates, with the nominal thicknesses of 8 mm, 6 mm and 4 mm, produced from industrially melted nanobainitic steel NANOS-BA®. The protective effectiveness of nanobainitic perforated plates in a system with a solid armour steel backing plate of 500 HBW hardness was tested by multi-hit firing, according to the procedures set out in the STANAG 4569 and AEP-55 vol. 1 specifications (adapted to the format of tested plates), against selected projectile types assigned to protection levels 2 and 3. Based on the analysis of the results of the firing tests and the macroscopic and microscopic examinations of the perforated plates before and after firing, the optimum perforation method was selected and the most favourable geometrical and dimensional arrangements of the perforations were determined for different plate thicknesses.
Celem badań było opracowanie technologii wytwarzania płyt perforowanych ze stali nanobainitycznej o skuteczności ochronnej konkurencyjnej w stosunku do obecnie dostępnych pancernych płyt perforowanych. Płyty perforowane o wymiarach 300 × 260 mm × (4 mm, 6 mm oraz 8 mm) wytworzono ze średniostopowej stali nanobainitycznej zawierającej 0,6% masowych węgla. Wykonano badania metalograficzne za pomocą mikroskopu świetlnego i skaningowego mikroskopu elektronowego oraz pomiary mikrotwardości i twardości. Testy ostrzałem wykonano wg STANAG 4569:ed3:2014 zgodnie z procedurą dostosowaną do wymiarów badanych płyt perforowanych. Wykonanie otworów w płytach metodą obróbki skrawaniem nie zmieniło właściwości mechanicznych w warstwach materiału przylegających do otworów. Wycinanie otworów laserem spowodowało spadek ciągliwości i w rezultacie zarodkowanie pęknięć w trakcie uderzenia pocisku. Wszystkie warianty układów płyt perforowanych o grubości 6 mm z płytami litymi o grubości 6 mm 500 HBW badane ostrzałem amunicją 7,62 × 39 mm-API-BZ spełniły wymagania poziomu 2 STANAG 4569. Układy płyt perforowanych o grubości 4 mm z płytą litą o grubości 4 mm 500 HBW nie spełniły wymagań poziomu 2. W wyniku ostrzału amunicją 7,62 × 54R mm-B32-API układów płyt perforowanych o grubości 8 mm z równoległymi płytami litymi 500 HBW o grubości 6 mm w zakresie poziomu 3 STANAG 4569, uzyskano pozytywne rezultaty dla określonych wariantów. Zaproponowano zmodyfikowane wzory perforacji dla płyt nanobainitycznych do finalnej weryfikacji eksperymentalnej.
Źródło:: Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa; 2023, 14, 1 (51); 23--60
2081-5891
Pojawia się w:: Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Molecular modelling of membrane activity of amphotericin B, a polyene macrolide antifungal antibiotic
Autorzy:: Baginski, Maciej
Sternal, Kamil
Czub, Jacek
Borowski, Edward
Powiązania:: https://bibliotekanauki.pl/articles/1041370.pdf
Data publikacji:: 2005
Wydawca:: Polskie Towarzystwo Biochemiczne
Tematy:: antifungal agents
lipid membrane
cholesterol
amphotericin B
molecular modelling
ergosterol
Opis:: Amphotericin B (AmB) is a well known polyene macrolide antibiotic used to treat systemic fungal infections. Despite its toxicity AmB is still regarded as a life-saving drug. The lack of adequate knowledge of the AmB mechanism of action is a serious obstacle to efficient development of new less toxic derivatives. Complementary to various experimental approaches, computational chemistry methods were used to study AmB mechanism of action. A programme lasting for a decade, that was run by our group covered studies of: i) molecular properties of AmB and its membrane targets, ii) structure and properties of AmB membrane channels, and iii) interaction of AmB with the membrane.
Źródło:: Acta Biochimica Polonica; 2005, 52, 3; 655-658
0001-527X
Pojawia się w:: Acta Biochimica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Dolerus (Poodolerus) vulneratus Mocsáry, 1878 (Hymenoptera, Symphyta: Tenthredinidae) – a sawfly species new for the Polish fauna
Autorzy:: Borowski, Jerzy
Plewa, Radosław
Jaworski, Tomasz
Hilszczański, Jacek
Powiązania:: https://bibliotekanauki.pl/articles/1182589.pdf
Data publikacji:: 2017
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: Dolerus vulneratus
Hymenoptera
Symphyta
Tenthredinidae
faunistic record
geographical distribution
new for Polish fauna
Opis:: A new species of sawfly, Dolerus (Poodolerus) vulneratus Mocsáry, 1878 for the Polish fauna is presented. Two males and females of this species were collected in Wielkopolska Lowland. It is a first record of this species in the Central Europe.
Źródło:: World Scientific News; 2017, 69; 236-238
2392-2192
Pojawia się w:: World Scientific News
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: New data on the occurrence of Sirex carinthiacus Konow, 1892 (Hymenoptera, Symphyta, Siricidae) in Poland
Autorzy:: Borowski, Jerzy
Plewa, Radosław
Jaworski, Tomasz
Hilszczański, Jacek
Sławski, Marek
Powiązania:: https://bibliotekanauki.pl/articles/1075712.pdf
Data publikacji:: 2019
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: Hymenoptera
Polska
Sirex carinthiacus
Siricidae
Symphyta
checklist
faunistic data
protection
sawfly
Opis:: New records of Sirex carinthiacus Konow are given, based on the collection of four females from three localities in eastern part of Poland. This very rare representative of the family Siricidae develops on spruces and undoubtedly demands protection over all its distribution area. The updated list of Siricidae occurring in Poland is given at the end of the paper.
Źródło:: World Scientific News; 2019, 119; 238-242
2392-2192
Pojawia się w:: World Scientific News
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Immunomodelling Characteristics of Mature Dendritic Cells Stimulated by Colon Cancer Cells Lysates
Autorzy:: Radej, Sebastian
Roliński, Jacek
Rawicz-Pruszyński, Karol
Bury, Paweł
Borowski, Grzegorz
Furmaga, Jacek
Chrościcki, Andrzej
Wallner, Grzegorz
Maciejewski, Ryszard
Powiązania:: https://bibliotekanauki.pl/articles/1395534.pdf
Data publikacji:: 2015-02-01
Wydawca:: Index Copernicus International
Tematy:: dendritic cells
colon cancer
cancer cells lysates
Th1
Th2
Opis:: Application of cells with high TAA (tumor associated antigen) presentation potential seems to be crucial in neoplasia immunotherapy. Such feature is distributed in dendritic cells, which present peptides from processed TAA - MHC molecules complex to the T cells of a host. The aim of the study was to assess the influence of colon neoplasia tissue lysate on functioning of generated autologous DC’s in the field of autologous CD4+ lymphocytes immunological response towards Th1/Th2 under in vitro environment together with comparison and assessment of DCs’ immunosuppressive properties acquired from patients with colon cancer. Material and methods. The population of this study consisted of 16 healthy- controls, 36colon cancer patients. Blood samples were collected 24h before planned surgery and preventive antibiotic therapy. Neoplastic tissue sample, was digested for cell lysates preparation. DC’s generation from PBMC was carried out in standard conditionsand medium enriched with rhGM-CSF and rhIL-4. Mature DC`s and cocultured autologous CD4 lymphocytes immunophenotype assessment was analyzed with flow cytometer. Intracellular and culture medium cytokines concentration was analyzed with ELISA and FACS method. Results. DC`s generated from colon cancer patients stimulated with lysates presented greater maturity, lower expression of CD206 antigen, significantly higher expression of HLA-DR, CD208 and CD209 and high intracellular expression of IL-12, compared to non-stimulated cells. Conclusions. The neoplastic tissue in vivo produces a number of substances having an unfavorable effect on immune system, our results suggests using lysates as good dendritic cells stimulators that possibly could have application in colon cancer immunotherapy
Źródło:: Polish Journal of Surgery; 2015, 87, 2; 71-82
0032-373X
2299-2847
Pojawia się w:: Polish Journal of Surgery
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Selected factors of fibrinolysis in the Buerger’s disease
Autorzy:: Terlecki, Piotr
Feldo, Marcin
Przywara, Stanisław
Iłżecki, Marek
Kęsik, Jan J.
Borowski, Grzegorz
Wroński, Jacek
Zubilewicz, Tomasz
Powiązania:: https://bibliotekanauki.pl/articles/1396478.pdf
Data publikacji:: 2013-11-01
Wydawca:: Index Copernicus International
Tematy:: Buerger’s disease
fibrinolysis
Opis:: Thrombangiitis obliterans (TAO marked by coexistence of thrombotic and inflammatory changes of neurovascular tract has evoked a considerable dispute concerning pathogenesis of this disease. The aim of the study was to define the level of activation of fibirinolitic system in course of TAO disease by means of determination its basic constituents as well as to examine the essence of level of fibrinolysis disorders in pathogenesis and development of this disease. Material and methods. Fifty patients with thrombangiitis obliterans (TAO), 30 patients with peripheral occlusive disease - PAOD (ASO) and 20 healthy volunteers (K) have been subjected to the examination. We determined the activity some factors of fibrinolysis: t-PA, PAI-1, PAP, plasminogen, α2-antiplasminogen, D-dimmer as well as euglobulin lysis time. The analysis comprised 7 features and 8 factors of variability: a membership to a group of patients, sex, age, smoking, aggravation of the disease within last 3 months, occurrence of Raynaud’s symptom, a degree of ischemia according to Fontaine, time the disease lasted. Results. The significant differences between the average were checked by means of t-Student test or variance analysis (ANOVA) and co-relation rate r (Pearson). We concluded that the average value of PAI-1 in the group TAO was significantly higher than in comparison with ASO group. The increased values were revealed in case of 76 % of patients. The euglobulin lysis time was vitally extended in case of 60% of patients in ASO group. In all three groups higher levels of α2-antiplasmin were detected in case of elderly patients compared to the younger ones. Conclusions. The obtained results allow us to ascertain the state of potentially weakened fibrinolysis in case of patients with Buerger’s disease as well as with PAOD.
Źródło:: Polish Journal of Surgery; 2013, 85, 11; 630-637
0032-373X
2299-2847
Pojawia się w:: Polish Journal of Surgery
Dostawca treści:: Biblioteka Nauki

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