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    Wyświetlanie 1-13 z 13
    Tytuł:
    Use of calcite in tricalcium phosphate based chemically bonded biomaterials
    Autorzy:
    Ślosarczyk, A.
    Czechowska, J.
    Zima, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/284790.pdf
    Data publikacji:
    2017
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    biomaterials
    calcium phosphates
    bones
    Źródło:
    Engineering of Biomaterials; 2017, 20, no. 143 spec. iss.; 12
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Surfactant-assisted fabrication and evaluation of macroporous calcium phosphate bone cements
    Autorzy:
    Cichoń, E.
    Zima, A.
    Ślósarczyk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/286139.pdf
    Data publikacji:
    2018
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    bone cements
    calcium
    phosphate
    Źródło:
    Engineering of Biomaterials; 2018, 21, 148; 56
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New cement-type materials based on Ag and Si doped hydroxyapatite for bone regeneration
    Autorzy:
    Siek, D.
    Czechowska, J.
    Zima, A.
    Ślosarczyk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/284670.pdf
    Data publikacji:
    2016
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    bone regeneration
    biomaterials
    hydroxyapatite
    Źródło:
    Engineering of Biomaterials; 2016, 19, 138; 89
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Biodegradable cement type bone implant materials based on calcium phosphates and calcium sulphate
    Autorzy:
    Siek, D.
    Czechowska, J.
    Zima, A.
    Ślósarczyk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/283901.pdf
    Data publikacji:
    2015
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    calcium phosphate cements
    hydroxyapatite
    calcium sulphate
    α-tricalcium phosphate
    biomaterials
    Opis:
    Calcium phosphates (CaPs) are widely used in hard tissue replacement because of their excellent biocompatibility. Calcium phosphate cements (CPCs) are an interesting alternative for sintered calcium phosphate ceramics due to their mouldability and self-setting properties which allow them to conform to even the most complex bone defects. However, one of the major limitations of CPCs is their relatively low resorption rate, not optimal for bone regeneration. The aim of our studies was to combine a stable hydroxyapatite with more soluble α-tricalcium phosphate (α-TCP) or calcium sulphate (CS) (resorbability: CS>>α-TCP>HA) to develop biomaterial with gradual degradation. Promising materials for use in minimally invasive surgery for bone defects repair were obtained. It was found that the degradation rate of hydroxyapatite based bone substitutes can be controlled by the addition of an appropriate kind and amount of more soluble constituent. The impact of the setting component (α-TCP or CS) on the physicochemical properties of the final products was confirmed. Furthermore the influence of organic additives (chitosan, methylcellulose, alginate) on the final materials characteristic was proven. Solutions of organic additives, applied as the liquid phases, significantly improved the workability of cement pastes. It has been demonstrated that implant materials based on calcium sulphate and α-TCP differed in their setting times, mechanical strength, dissolution rate and morphologies of apatite layers on their surfaces after soaking in simulated body fluid. The reason of observed differences is a higher susceptibility of calcium sulphate to both disintegration and degradation.
    Źródło:
    Engineering of Biomaterials; 2015, 18, 133; 2-6
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of titanium on the sintering and microstructure of Ti-doped hydroxyapatite
    Autorzy:
    Ślósarczyk, A.
    Zima, A.
    Paszkiewicz, Z.
    Szczepaniak, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/284252.pdf
    Data publikacji:
    2009
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    hydroxyapatite
    titanium
    biomaterials
    Źródło:
    Engineering of Biomaterials; 2009, 12, no. 89-91; 37
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hydroxyapatite - chitosan material with silver nanoparticles
    Autorzy:
    Zima, A.
    Czechowska, J.
    Cichoń, E.
    Ślósarczyk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/285308.pdf
    Data publikacji:
    2018
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    hydroxyapatite
    chitosan
    nanoparticles
    Źródło:
    Engineering of Biomaterials; 2018, 21, 148; 57
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Physicochemical properties of the novel biphasic hydroxyapatite–magnesium phosphate biomaterial
    Autorzy:
    Pijocha, D.
    Zima, A.
    Paszkiewicz, Z.
    Ślósarczyk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/307424.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    composite
    bone substitute
    hydroxyapatite
    magnesium phosphate cement
    kompozyty
    hydroksyapatyt
    materiałoznawstwo
    Opis:
    Besides high-temperature calcium phosphates (CaPs), low-temperature calcium phosphate bone cements (CPCs), due to excellent biological properties: bioactivity, biocompability and osteoconductivity, are successfully used as bone substitutes. However, some disadvantages, related mainly to their low resorption rate and poor mechanical properties result in limited range of applications of these implant materials to non-loaded places in the skeletal system. To overcome this problem, magnesium phosphate cements (MPCs) with high strength have been considered as biomaterials. The main disadvantage of MPCs is that the acid-base setting reaction is an exothermic process that must be strictly controlled to avoid tissue necrosis. In this work, a new composite bone substitute (Hydroxyapatite Magnesium Phosphate Material – HMPM) based on hydroxyapatite (HA) and magnesium phosphate cement (MPC) with sodium pyrophosphate applied as a retardant of setting reaction was obtained. Its setting time was adequate for clinical applications. Combining properties of HA and MPC has made it possible to obtain microporous (showing bimodal pore size distribution in the range of 0.005–1.700 micrometers) potential implant material showing good surgical handiness and sufficient mechanical strength. Effectiveness of sodium pyrophosphate as a retardant of exothermic setting reaction of the new cement formulation was confirmed. After setting and hardening, the material consisted of hydroxyapatite and struvite as crystalline phases. Unreacted magnesium oxide was not detected.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2013, 15, 3; 53-63
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bioactivity of cement type bone substitutes
    Autorzy:
    Siek, D.
    Czechowska, J.
    Mróz, W.
    Zima, A.
    Burdyńska, S.
    Załęczny, R.
    Ślósarczyk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/200610.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    bone implants
    bioactivity
    surface morphology
    Opis:
    In vitro chemical stability and bioactivity of three different cement type bone substitutes were determined by incubating cement samples in the simulated body fluid (SBF) for 7 and 28 days. Morphology of sample surfaces has been studied using scanning electron microscopy (SEM) combined with an energy dispersive X-ray spectroscopy (EDS) and by atomic force microscopy (AFM). The diffuse reflectance Fourier-transform infrared spectroscopy (DRIFTS) was applied as a supplementary method. The development of bone-like apatite layers on the surface depended on their initial phase composition. Obtained cements showed good surgical handiness, high bioactive potential and were chemically stable. They seem to be promising materials for bone substitution.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 2; 433-439
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of simulated body fluid on the microstructure of melt spun composite fibers
    Autorzy:
    Rajzer, I.
    Rom, M.
    Fabia, J.
    Sarna, E.
    Biniaś, D.
    Zima, A.
    Ślósarczyk, A.
    Janicki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/283899.pdf
    Data publikacji:
    2009
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    composites fibers
    simulated body fluid
    polylactic acid
    hydroxyapatite
    bone tissue regeneration
    Opis:
    Polylactic acid (PLA) offers unique features of biodegradability and thermal processability, that offer potential applications in medicine. PLA can be transformed into fibers by spinning enabling then subsequent fabrication of desirable three dimensional fabrics which may be used as scaffolds for tissue engineering applications. Incorporation of synthetic nano-hydroxyapatite into the fibrous polymer matrix can enhance bioactive properties of the prospective scaffold. In the present work, the method of production of composite fibers based on polylactic acid (PLA) and nano-hydroxyapatite (n-HAp) is proposed. Obtained fibers have shown excellent apatite-forming ability when immersed in simulated body fluid.
    Źródło:
    Engineering of Biomaterials; 2009, 12, 88; 2-4
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Human osteoblast-like MG 63 cells in cultures on carbon fibre-reinforced carbon composites coated with zirconium nitride
    Autorzy:
    Paul, J.
    Bacakova, L.
    Douderova, M.
    Stary, V.
    Vyskocil, J.
    Lisa, V.
    Ślósarczyk, A.
    Zima, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/284293.pdf
    Data publikacji:
    2007
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Tematy:
    CFRC
    włókna węglowe
    carbon fibres
    Opis:
    Zirconium nitride is considered as a promising material for strengthening for surface of various materials, especially those designed for hard tissue surgery. In this study, five groups of materials were prepared: non-modified carbon fibre-reinforced carbon composites (CFRC), CFRC ground with metallographic paper, non-ground CFRC with a layer of ZrN deposited by magnetron sputtering, ground CFRC with a ZrN layer deposited by the arc technique, and ground CFRC with a ZrN layer deposited by a magnetron. We found that all samples gave good support for the adhesion and growth of human-osteoblast-like MG 63 cells, though the cell numbers on these materials were often lower than on standard cell culture polystyrene dishes and microscopic glass coverslips. Nevertheless, ZrN films can be considered as suitable materials for surface modification of bone implants in order to improve their mechanical properties and their integration with the surrounding tissue.
    Źródło:
    Engineering of Biomaterials; 2007, 10, no. 67-68; 5-8
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Selected issues of bills of quantities in construction works in Poland
    Autorzy:
    Juszczyk, M.
    Leśniak, A.
    Zima, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1395617.pdf
    Data publikacji:
    2017
    Wydawca:
    Akademia Wojsk Lądowych imienia generała Tadeusza Kościuszki
    Tematy:
    BOQ
    bill of quantities principles
    digital taking off
    Opis:
    A bill of quantities (BOQ) is an important link in the cost estimation process and construction work planning. The correctness of determining the amount of work in a bill of quantities affects the accuracy of costing of construction works in budget estimates, as well as the quality of work implementation schedules. In the paper the authors point out some problems related to the issue of performing a bill of quantities in Poland. They refer to the applicable ways of taking off under the applicable legal framework and in the light of environmental methods. They draw attention to possible taking off methods. The paper also raises problems of inconsistency of definitions, discrepancies in the available principles of a bill of quantities, including temporary and accompanying works while performing BOQs.
    Źródło:
    Zeszyty Naukowe / Wyższa Szkoła Oficerska Wojsk Lądowych im. gen. T. Kościuszki; 2017, 1; 189-200
    1731-8157
    Pojawia się w:
    Zeszyty Naukowe / Wyższa Szkoła Oficerska Wojsk Lądowych im. gen. T. Kościuszki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design and Build procurement system – contractor selection
    Autorzy:
    Leśniak, A.
    Plebankiewicz, E.
    Zima, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/230603.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    zaprojektuj i wybuduj
    inwestycja budowlana
    projekt publiczny
    wybór wykonawcy
    design and build system
    public project
    building investment
    contractor selection
    Opis:
    One of the contract awarding systems in public sector in Poland is the Design & Build system. In this system, a client concludes a contract agreement with only one company, a contractor, in order to carry out both design and construction of works. While deciding on this form of delivery of a public project, the client is obliged to conduct a single proceeding aiming to select the contractor. In this paper, public works contracts awarded in the D&B system in Poland are analysed, whilst attention was put on the contracting modes and assessment criteria. The results are assessed against the experience of other countries and recommended methods for selection of the Design and Build contractor.
    Źródło:
    Archives of Civil Engineering; 2012, 58, 4; 463-476
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling of heat and flow phenomena occuring in waterwall tubes of boilers for supercritical steam parameters
    Autorzy:
    Zima, W.
    Grądziel, S.
    Cebula, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/240331.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ekran wodny
    model matematyczny
    parametry nadkrytyczne
    parametry rozłożone
    schemat różnicowy
    distributed parameters
    Implicit difference scheme
    mathematical model
    supercritical parameters
    waterwalls
    Opis:
    In this paper a mathematical model enabling the analysis of the heat-flow phenomena occurring in the waterwalls of the combustion chambers of the boilers for supercritical parameters is proposed. It is a one-dimensional model with distributed parameters based on the solution of equations describing the conservation laws of mass, momentum, and energy. The purpose of the numerical calculations is to determine the distributions of the fluid enthalpy and the temperature of the waterwall pipes. This temperature should not exceed the calculation temperature for particular category of steel. The derived differential equations are solved using two methods: with the use of the implicit difference scheme, in which the mesh with regular nodes was applied, and using the Runge-Kutta method. The temperature distribution of the waterwall pipes is determined using the CFD. All thermophysical properties of the fluid and waterwall pipes are computed in real-time. The time-spatial heat transfer coefficient distribution is also computed in the on-line mode. The heat calculations for the combustion chamber are carried out with the use of the zone method, thus the thermal load distribution of the waterwalls is known. The time needed for the computations is of great importance when taking into consideration calculations carried out in the on-line mode. A correctly solved one-dimensional model ensures the appropriately short computational time.
    Źródło:
    Archives of Thermodynamics; 2010, 31, 3; 19-31
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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