Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

Wyszukujesz frazę "Szymczyk, D." wg kryterium: Autor

  Lista filtrów
Wyrównaj
    Wyświetlanie 1-12 z 12
    Tytuł:
    Numerical analysis of an open cell foam structure with the use of models based on solid finite elements
    Autorzy:
    Szymczyk, W.
    Miedzińska, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/245581.pdf
    Data publikacji:
    2009
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    FEM modelling
    open cell foam structure
    effective properties
    Opis:
    The paper deals with the numerical analysis of foam materials. Open cell foam is investigated. Numerical simulations allow calculating modes of destruction and assessing effective properties of the model structures. Metal as well as polyurethane foams show out interesting properties. They are light, have good acoustic and/or magnetic isolation, have ability to absorb energy of vibration and hits. They are used for sandwich panels, hit absorber s (i.e. as elements of buffer constructions in rail vehicles), fillers of construction parts, bodies of vehicles (i. e. floating combat vehicles), dividing walls on vessels and others. Specially prepared open cell foams show out auxetic properties and shape memory effect. Such materials are very good for seats in aircrafts which may protect pilots and passengers during crashes and restrict heavy backbone injuries. Foams are used for filtering purposes. Foams themselves or in combination with different types of fillers (i.e. elastomers) or ceramic reinforcement may be used for hit energy absorbing panels for military purposes (protection against explosion shock wave and splinters). Presented work is apart of a series of numerical experiments which aim is to investigate the influence of geometry parameters onto effective properties of the foam. Different types of geometries are used for numerical experiments. All the models of single foam cell are based on Kelvin grain geometry. Numerical compression tests performed with the use of models based on solid finite elements provide studying the process of the structure failure. Effective characteristics of investigated foams show out that such materials would be useful for energy absorbing purposes.
    Źródło:
    Journal of KONES; 2009, 16, 3; 409-414
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical modelling of the foamed materials structures with the usage of the 2D and beam elements
    Autorzy:
    Miedzińska, D.
    Szymczyk, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/245977.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    foamed aluminium
    microstructure
    FE modelling
    Kelvin structure
    Opis:
    The possible options as materials for protective layers are aluminium foams which become also very popular due to their lightweight and excellent plastic energy absorbing properties. Such characteristics have been appreciated by the automotive industry with continued research to further understandfoam properties. Compressed foaming materials exhibit extensive plastic response, while the initial elastic region is limited in tension by a tensile brittle-failure stress. Aluminium foams have become an attractive material as blast protective layers due to their desirable compressive properties. With different material engineering techniques (as, for example double-layer foam cladding) they can be customized to achieve the most desirable properties. Energy absorption capacity of foams under blast load was analytically confirmed based on a rigid-perfectly plastic-locking foam model. Initial research indicates that energy absorbed by the cladding is much larger than that under quasi-static conditions due to shock wave effect. The methods of numerical modellingfor open and closed cell aluminium foams arepresented in the paper. The numerical models of foam ideal microstructures created with shell and together shell and beam finite elements are shown. The models were developed on the basis of Kelvin tetrakaidecahedrons - structures consisting of six sąuares and eight hexagons. In the case of open cell foams the circle wholes were removed from polyhedron surfaces. Then the numerical analysis o f a created models compressive test was carried out with the usage of MSC.Marc computer code. The nonlinear procedur es were applied. The results were analyzed in the scope of the assessing the behaviour of the open cell aluminium foam unit cell under the compressive load.
    Źródło:
    Journal of KONES; 2010, 17, 1; 267-272
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative study of hybrid foam microstructure models
    Autorzy:
    Szymczyk, W.
    Miedzińska, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/246261.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    FEM modelling
    foam structure
    elastomer filament
    geometry orientation
    Opis:
    Cellular solids are materials made out of solid strut or thin plate like structures bridged together. They occur in nature in the form of honeycombs, wood, bone, cork etc. These materials possess a unique combination of properties such as low thermal conductivitv, low density and high energy-absorption. Foams are a class of cellular solids, generally made by dispersing gas into a liquid material and then cooling it to solidify. They are categorized as open-cell and closed-cell foams. Depending on the solid materials that are made into foams, they are also categorized as polymeric foams, metallic foams, and ceramic foams. Due to developments in material science and manufacturing lechniques, advanced foams have found potential for use in automobile, aircraft, and space vehicle structures. In the paper the comparative study of the hybrid foam microstructures is presented. Hybrid foam is a new, still developed material that is built of the aluminum open cell foam matrix filled with other material (here: elastomer). The numerical models based on cubic geometry in different configurations are developed. The FE analysis of the compression test is curried out. The results are presented and analyzed due to the microstructure geometry influence on the material behaviour.
    Źródło:
    Journal of KONES; 2010, 17, 4; 505-511
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Failure analysis of chosen 3D numerical models of an open cell foam
    Autorzy:
    Szymczyk, W.
    Miedzińska, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/243845.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    FEM modelling
    open cell foam structure
    Opis:
    Metal and polyurethane foams exhibit interesting properties. They are light, have good acoustic and/or magnetic isolation as well as ability to absorb the vibration and impact energy. They are used for sandwich panels, impact absorbers (i.e. as elements of the buffer constructions in rail vehicles), fillers ofconstruction parts, bodies of vehicles (i.e. floating combat vehicles) and for dividing walls of vessels and others. Speciflcally made open cell foams demonstrate auxetic properties and the shape memory effect. Such materials are very good for seats in aircrafts which may protect pilots and passengers during crashes and limit heavy backbone injuries. Foams are used for filtering purposes. Foams or their in combination with different types of fillers (i.e. elastomers) or the ceramic reinforcement may be used in impact energy absorbing panels for military aim (protection against an explosion shock wave and splinters). In the paper aluminium open-cell foam structures were investigated for their energy absorption ability. For this purpose a series of numerical 3D models were applied. Geometry of the models was based on Kehin's polyhedrons. Tests of uniaxial compression were simulated with the use of LS-Dyna computer code. Complex contact phenomena were considered. Preliminary test were performed with the use of single foam cell models. Further simulations were conducted using 3x3x3 cell models. The results were analyzed as force/time characteristics.
    Źródło:
    Journal of KONES; 2010, 17, 1; 449-454
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical analysis of an open cell foam structure with the use of models based on 2D finite elements
    Autorzy:
    Szymczyk, W.
    Miedzińska, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/242137.pdf
    Data publikacji:
    2009
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    FEM modelling
    open cell foam structure
    effective properties
    Opis:
    The paper deals with the numerical analysis of foam materials. Open cell foam is investigated. Numerical simulations allow calculating modes of destruction and assessing effective properties of the model structures. Metal as well as polyurethane foams show out interesting properties. They are light, have good acoustic and/or magnetic isolation, have ability to absorb energy of vibration and hits. They are used for sandwich panels, hit absorber s (i.e. as elements of buffer constructions in rail vehicles),fillers of construction parts, bodies of vehicles (i.e. floating combat vehicles), dividing walls on vessels and others. Specially prepared open cell foams show out auxetic properties and shape memory effect. Such materials are very good for seats in aircrafts which may protect pilots and passengers during crashes and restrict heavy backbone injuries. Foams are used for filtering purposes. Foams themselves or in combination with different types of fillers (i.e. elastomers) or ceramic reinforcement may be used for hit energy absorbing panels for military purposes (protection against explosion shock wave and splinters). Presented work is a part of a series of numerical experiments which aim is to investigate the influence of geometry parameters onto effective properties of the foam. Different types of geometries are used for numerical experiments. All the models of single foam cell are based on Kelvin grain geometry. Numerical compression tests performed with the use of models based on 2D finite elements provide studying the process of the structure failure. Effective characteristics of investigated foams show out that such materials would be useful for energy absorbing purposes.
    Źródło:
    Journal of KONES; 2009, 16, 2; 441-448
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Navigation in large-format buildings based on RFID sensors and QR and AR markers
    Autorzy:
    Szymczyk, T.
    Montusiewicz, J.
    Gutek, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/957976.pdf
    Data publikacji:
    2016
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    navigation
    augmented reality
    passive location
    mobile devices
    Opis:
    The authors address the problem of passive navigation in large buildings. Based on the example of several interconnected buildings housing departments of the Lublin University of Technology, as well as the conceptual navigation system, the paper presents one of the possible ways of leading the user from the entrance of the building to a particular room. An analysis of different types of users is made and different (best for them) ways of navigating the intricate corridors are proposed. Three ways of user localisation are suggested: RFID, AR and QR markers. A graph of connections between specific rooms was made and weights proposed, representing “the difficulty of covering a given distance”. In the process of navigation Dijkstra’s algorithm was used. The road is indicated as multimedia information: a voice-over or animated arrow showing the direction displayed on the smart phone screen with proprietary software installed. It is also possible to inform the user of the position of the location in which he currently is, based on the static information stored in the QR code.
    Źródło:
    Advances in Science and Technology. Research Journal; 2016, 10, 31; 263-273
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis and characterization of new reactive polymer blends based on post-consumer glycol-modified poly(ethylene terephthalate) foils and poly(tetramethyleneoxide)
    Synteza i charakterystyka nowych reaktywnych mieszanin polimerowych opartych na poużytkowych foliach z poli(tereftalanu etylenu) oraz poli(tlenku tetrametylenu)
    Autorzy:
    Paszkiewicz, S.
    Szymczyk, A.
    Irska, I.
    Pawlikowska, D.
    Piesowicz, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/947294.pdf
    Data publikacji:
    2018
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
    Tematy:
    reactive blend
    post-consumer glycol-modified poly(ethylene terephthalate) foil
    glass transition temperature
    thermal stability
    mieszanina reaktywna
    poużytkowa folia z poli(tereftalanu etylenu) modyfikowanego glikolem
    temperatura zeszklenia
    stabilność termiczna
    Opis:
    Two series of reactive polymer blends based on post-consumer glycol-modified poly(ethylene terephthalate) (PETG) and poly(tetramethylene oxide) (PTMO) were prepared in order to investigate the possibility of utilization of waste PETG foils from the packaging industry. The resulting copolymer consisted of hard segments based on PETG and soft segments of PTMO, the latter accounted for 25, 35 or 50 percent of the total mass. The effects of the content and length of the soft segments derived from poly(oxybutylene) glycol, with molecular weights of 1000 or 2000, on the structure and thermal properties of the resulting materials were investigated.
    Przygotowano dwie serie reaktywnych mieszanin polimerowych na bazie poużytkowej folii z poli(tereftalanu etylenu) modyfikowanego glikolem (PETG) oraz poli(tlenku tetrametylenu) (PTMO) w celu zbadania możliwości zagospodarowania odpadowych folii PETG z przemysłu opakowaniowego. PETG stanowił w kopolimerze segmenty sztywne, a PTMO segmenty giętkie, których udział wynosił 25, 35 lub 50 % mas. Zbadano wpływ udziału segmentów giętkich oraz długości ich łańcuchów, pochodzących z glikolu polioksybutylenowego o masie molowej odpowiednio 1000 g/mol lub 2000 g/mol, na strukturę oraz właściwości termiczne otrzymanych materiałów.
    Źródło:
    Polimery; 2018, 63, 1; 45-48
    0032-2725
    Pojawia się w:
    Polimery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The ability of S.aureus to form biofilm on the Ti-6Al-7Nb scaffolds produced by Selective Laser Melting and subjected to the different types of surface modifications
    Autorzy:
    Szymczyk, P.
    Junka, A.
    Ziółkowski, G.
    Smutnicka, D.
    Bartoszewicz, M.
    Chlebus, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/306293.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    SLM
    micro-CT
    scaffolds
    Ti-6Al-7Nb alloy
    orthopedics
    S.aureus
    ortopedia
    Opis:
    The Gram-positive coccus, Staphylococcus aureus, is the leading etiologic agent of limb and life-threatening biofilm-related infections in the patients following the orthopaedic implantations. The aim of the present paper is to estimate the ability of S. aureus to form biofilm on titanium alloy (Ti-6Al-7Nb) scaffolds produced by Selective Laser Melting (SLM) and subjected to the different types of surface modifications, including ultrasonic cleaning and chemical polishing. The results obtained indicate significantly the decreased ability of S.aureus to form biofilm on the surface of scaffolds subjected to the chemical polishing in comparison to the scaffolds cleaned ultrasonically. The data provided can be useful for future applications of the SLM technology in production of Ti-6Al-7Nb medical implants.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2013, 15, 1; 69-76
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impedance Sensors Made in PCB and LTCC Technologies for Monitoring Growth and Degradation of Pseudomonal Biofilm
    Autorzy:
    Chabowski, K.
    Junka, A. F.
    Piasecki, T.
    Nowak, D.
    Nitsch, K.
    Smutnicka, D.
    Bartoszewicz, M.
    Moczała, M.
    Szymczyk, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/221326.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Pseudomonas aeruginosa
    biofilm
    interdigitated sensor
    impedance spectroscopy
    Opis:
    The suitability of low-cost impedance sensors for microbiological purposes and biofilm growth monitoring was evaluated. The sensors with interdigitated electrodes were fabricated in PCB and LTCC technologies. The electrodes were golden (LTCC) or gold-plated (PCB) to provide surface stability. The sensors were used for monitoring growth and degradation of the reference ATCC 15442 Pseudomonas aeruginosa strain biofilm in invitro setting. During the experiment, the impedance spectra of the sensors were measured and analysed using electrical equivalent circuit (EEC) modelling. Additionally, the process of adhesion and growth of bacteria on a sensor’s surface was assessed by means of the optical and SEM microscopy. EEC and SEM microscopic analysis revealed that the gold layer on copper electrodes was not tight, making the PCB sensors susceptible to corrosion while the LTCC sensors had good surface stability. It turned out that the LTCC sensors are suitable for monitoring pseudomonal biofilm and the PCB sensors are good detectors of ongoing stages of biofilm formation.
    Źródło:
    Metrology and Measurement Systems; 2017, 24, 2; 369-380
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rare case of Richter’s syndrome localization in liver and thyroid of a patient with a chronic lymphocytic leukemia (CLL) - case report and literature
    Autorzy:
    Wasik-Szczepanek, E.
    Szymczyk, A.
    Szczepanek, D.
    Grywalska, E.
    Szumiło, J.
    Trojanowski, P.
    Czabak, O.
    Hus, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2085452.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Medycyny Wsi
    Tematy:
    liver
    thyroid
    chronic lymphocytic leukemia
    Richter’s syndrome
    Opis:
    Richter’s syndrome (RS) is a rare complication in which chronic lymphocytic leukaemia (CLL) or small lymphocytic lymphoma (SLL) transforms into a more aggressive type of lymphoma – diffuse large B cell lymphoma (DLBCL), or Hodgkin’s lymphoma (HL). The review describes the clinical case of a patient with CLL and RS diagnosis. A computed tomography (CT) scan of the abdominal cavity detected numerous normodense areas in the liver. Simultaneously, ultrasound examination (USG) of the thyroid revealed the presence of a solid hypoechogenic lump. The material sampled from closed biopsies of liver and thyroid in both cases allowed the diagnosis of diffuse large B cell lymphoma (DLBCL). The liver and the thyroid are particularly rare locations of RS. However, those cases allowed the conclusion that RS may occur even in a very unexpected and less probable location.
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2020, 27, 1; 160-164
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The chemical digestion of Ti6Al7Nb scaffolds produced by Selective Laser Melting reduces significantly ability of Pseudomonas aeruginosa to form biofilm
    Autorzy:
    Junka, A. F.
    Szymczyk, P.
    Secewicz, A.
    Pawlak, A.
    Smutnicka, D.
    Ziółkowski, G.
    Bartoszewicz, M.
    Chlebus, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/307092.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    technologia SLM
    Pseudomonas aeruginosa
    skafoldy
    modyfikacja powierzchni
    Ti-6Al-7Nb
    SLM technology
    scaffolds
    surface modification
    Opis:
    In our previous work we reported the impact of hydrofluoric and nitric acid used for chemical polishing of Ti-6Al-7Nb scaffolds on decrease of the number of Staphylococcus aureus biofilm forming cells. Herein, we tested impact of the aforementioned substances on biofilm of Gram-negative microorganism, Pseudomonas aeruginosa, dangerous pathogen responsible for plethora of implant-related infections. The Ti-6Al-7Nb scaffolds were manufactured using Selective Laser Melting method. Scaffolds were subjected to chemical polishing using a mixture of nitric acid and fluoride or left intact (control group). Pseudomonal biofilm was allowed to form on scaffolds for 24 hours and was removed by mechanical vortex shaking. The number of pseudomonal cells was estimated by means of quantitative culture and Scanning Electron Microscopy. The presence of nitric acid and fluoride on scaffold surfaces was assessed by means of IR and rentgen spetorscopy. Quantitative data were analysed using the Mann–Whitney test (P ≤ 0.05). Our results indicate that application of chemical polishing correlates with significant drop of biofilm-forming pseudomonal cells on the manufactured Ti-6Al-7Nb scaffolds ( p = 0.0133, Mann–Whitney test) compared to the number of biofilm-forming cells on non-polished scaffolds. As X-ray photoelectron spectroscopy revealed the presence of fluoride and nitrogen on the surface of scaffold, we speculate that drop of biofilm forming cells may be caused by biofilm-supressing activity of these two elements.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2016, 18, 1; 115-120
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improvement of barrier properties of glycol modified poly(ethylene terephthalate) based nanocomposites containing graphene derivatives forms
    Poprawa właściwości barierowych nanokompozytów polimerowych opartych na modyfikowanym poli(tereftalanie etylenu) z dodatkiem pochodnych grafenu
    Autorzy:
    Paszkiewicz, S.
    Szymczyk, A.
    Pawlikowska, D.
    Irska, I.
    Piesowicz, E.
    Jotko, M.
    Lisiecki, S.
    Bartkowiak, A.
    Sieradzka, M.
    Fryczkowski, R.
    Kochmańska, A.
    Kochmański, P.
    Rosłaniec, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/946934.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
    Tematy:
    graphene derivatives forms
    glycol-modified poly(ethylene terephthalate)
    in situ polymerization
    barrier properties
    pochodne grafenu
    poli(tereftalan etylenu) modyfikowany glikolem cykloalifatycznym
    polimeryzacja in situ
    właściwości barierowe
    Opis:
    The development and further studies on several types of graphene nanoplatelets (GNP) have enabled manufacture of electrically conductive and reinforced polymer nanocomposites with enhanced gas barrier performance at extremely low loading. Herein, we present the synthesis process, morphology and gas barrier properties of the glycol modified poly(ethylene terephthalate) (PETG) based nanocomposites. For the first time, we compared how different types of GNPs, at the same nanofiller's content of 0.5 wt %, affect the properties of polymer matrix obtained by in situ polymerization.
    Opracowano nanokompozyty polimerowe (PETG) na bazie poli(tereftalanu etylenu) (PET) modyfikowanego glikolem cykloalifatycznym z niewielkim dodatkiem wybranych typów płytek grafenowych (GNP). Zbadano morfologię PETG oraz ich właściwości barierowe. Oceniono wpływ dodatku różnego typu nanopłytek grafenowych na właściwości osnowy polimerowej w nanokompozytach otrzymanych metodą polimeryzacji in situ. Stwierdzono, że otrzymane, wzmocnione nanocząstkami grafenu i elektrycznie przewodzące kompozyty PETG odznaczały się zwiększoną barierowością w stosunku do par i gazów.
    Źródło:
    Polimery; 2017, 62, 11-12; 868-874
    0032-2725
    Pojawia się w:
    Polimery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

      Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies