Informacja

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

Wyszukujesz frazę "Fibers" wg kryterium: Temat


Tytuł:
Properties of fiber-gypsum composite formed on the basis of hemp (Cannabis sativa L.) fibers grown in Poland and natural gypsum
Autorzy:
Trociński, Adrian
Wieruszewski, Marek
Kawalerczyk, Jakub
Mirski, Radosław
Powiązania:
https://bibliotekanauki.pl/articles/24072413.pdf
Data publikacji:
2023
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
hemp fibers
natural gypsum
hemp fibers-gypsum composites
Opis:
Properties of fiber-gypsum composite formed on the basis of hemp (Cannabis sativa L.) fibers grown in Poland and natural gypsum. The popularity of composites reinforced with natural fibers is constantly growing and therefore, they are a subject of many scientific works as well. An example of interesting concept is the use of hemp fibers to reinforce a gypsum matrix and therefore, presented study was aimed to determine the effect of their content on the properties of resultant composites. Moreover, the influence of setting temperature was also investigated. The scope of the research included determination of properties such as: density, setting time, bending strength, modulus of elasticity and thermal conductivity coefficient. Studies have shown that as the amount introduced fibers increases, the density of manufactured composites decreases. Furthermore, increase in the content of hemp causes a significant extension in setting time of the gypsum matrix. Based on the outcomes of mechanical properties, it was found that the optimal content of fibers is 4% and further increase in their share results in a deterioration of flexural strength characteristics. The increase in a setting temperature leads to the reduction in their bending strength and modulus of elasticity. Composites reinforced with hemp fibers demonstrate significantly improved thermal insulation properties
Właściwości kompozytów włóknisto-gipsowych powstałych na bazie włókien konopi siewnej (Cannabies sativa L.) uprawianych w Polsce i gipsu naturalnego. Popularność kompozytów wzmacnianych włóknami naturalnymi nieprzerwanie rośnie, co sprawia, że są one przedmiotem wielu badań naukowych. Przykładem interesującej koncepcji jest wykorzystanie włókien konopi siewnej w celu wzmocnienia płyt gipsowych. A zatem, przeprowadzone zostały badania dotyczące wpływu ilości dodawanych włókien konopnych oraz temperatury sieciowania wzmocnionej matrycy na właściwości wytworzonych kompozytów gipsowych. Zakres przeprowadzonych eksperymentów obejmował określenie gęstości, czasu sieciowania, wytrzymałości na zginanie, modułu sprężystości oraz współczynnika przewodzenia ciepła. Badania wykazały, iż wraz ze wzrostem udziału włókien czas sieciowania matrycy znacznie się wydłuża, a gęstość otrzymywanych kompozytów maleje. Wykazano również, iż optymalną ilością wzmocnienia konopnego zapewniającą najlepsze właściwości wytrzymałościowe jest 4%, a dalsze zwiększenie jego udziału powoduje znaczne pogorszenie wytrzymałości. Ponadto zwiększenie temperatury podczas sieciowania wpływa negatywnie na charakterystykę wytrzymałościową wyprodukowanych płyt. Właściwości izolacyjne ulegały natomiast znacznej poprawie wraz z rosnącym udziałem włókien konopnych w płycie gipsowej.
Źródło:
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology; 2023, 121; 29--36
1898-5912
Pojawia się w:
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Chopped Glass and Carbon Fiber Reinforcement on Physical, Mechanical, and Fire Performance of Wood Plastic Composites
Autorzy:
Durmaz, Sefa
Aras, Uğur
Avci, Erkan
Mengeloğlu, Fatih
Atar, İlkay
Powiązania:
https://bibliotekanauki.pl/articles/27323542.pdf
Data publikacji:
2023
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technologii Drewna
Tematy:
WPCs
glass fibers
carbon fibers
synergic effect
LOI analysis
Opis:
Wood plastic composites are among the most popular engineering materials, used as deck materials as well as in construction. To improve the properties of wood plastic composites, they are reinforced with various materials. This study investigates the synergic effect of glass fiber and carbon fiber reinforcement on wood plastic composites regarding their physical, mechanical, and fire resistance performance. The reinforcement materials significantly limited the water absorption due to their hydrophobic nature. The reinforcement fibers acted as a barrier against water and limited the uptake although the water absorption and thickness swelling values increased with exposure time. Moreover, the high strength of the reinforcement fibers improved the modulus of elasticity up to 122% and 41% for the flexural strength. Additionally, the long glass fibers significantly contributed to improving the tensile strength, which indicates that fiber length is essential. The scanning electron microscope micrographs revealed that the carbon fibers had a rougher surface than the glass fibers, proving their higher resistance to stress. The observed gaps were also evidence of poor adhesion between the matrix and the fibers. On the other hand, the carbon fibers and long glass fibers positively affected the load transfer in the matrix. Unfortunately, the fiber reinforcement has only a slight effect on the fire resistance performance. Furthermore, the improvement in the limit oxygen index test values was limited. However, the reinforcement fibers exhibit a barrier effect, inhibiting dropping, which is crucial for structural integrity.
Źródło:
Drewno. Prace Naukowe. Doniesienia. Komunikaty; 2023, 66, 212; Art. no. 177638
1644-3985
Pojawia się w:
Drewno. Prace Naukowe. Doniesienia. Komunikaty
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Flexural characterization of polymer concrete comprising waste marble and date palm fibers
Autorzy:
Rokbi, Mansour
Rahmouni, Zine El Abidine
Baali, Brahim
Powiązania:
https://bibliotekanauki.pl/articles/298435.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
polymer concrete
date palm fibers
quartz
marble
fibers sizing
Opis:
Three-point bending. Abstract This work is an experimental approach for the development and characterization of a polymer concrete reinforced with natural fibers. The polymer concrete consists of sand (Quartz) and orthophthalic polyester used as a binder. Marble powder was used to ensure the continuity of the particle size of the granular mixture. As reinforcement, 2% of chopped date palm fibers (short, very short or mixed) were added. For comparison, identical polymer concrete flexure specimens reinforced with the same content of short E-glass fibers were also prepared and tested. All specimens were initially cured at room temperature and then post-cured for 6 h at 70°C. The results of three-point bending on smooth specimens with different rates of charges (marble), showed that the flexural and compressive strength were improved by adding 20% of marble, and were 31.80 MPa and 67.42 MPa respectively. The flexural strength of specimens showed that the improvement or the degradation of polymer concrete properties seemed to be attributed to the nature of fibers (treated or untreated), and/or to the fibers sizing (short, very short or mixed).
Źródło:
Technical Sciences / University of Warmia and Mazury in Olsztyn; 2019, 22(2); 169-182
1505-4675
2083-4527
Pojawia się w:
Technical Sciences / University of Warmia and Mazury in Olsztyn
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preliminary investigation of alginate fibers modified with magnetite
Autorzy:
Frączek-Szczypta, A.
Piecek, A.
Boguń, M.
Błażewicz, S.
Powiązania:
https://bibliotekanauki.pl/articles/284612.pdf
Data publikacji:
2011
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
nanocomposites
fibers
biomaterials
Opis:
In this work alginate nanocomposite fibers modified with magnetite were investigated as prospective material for bone tissue regeneration after tumor resection. In the first stage of the research the morphology of composite fibers and their chemical composition were evaluated. Determination of the mechanical properties of the nanocomposite materials indicated that magnetite does not improve the strength of the nanocomposites. A slight increase of Young’s modulus was observed only for composite fibers with a lower concentration of nanoadditive. Weekly and monthly incubation of fibers in distilled water indicates the release of magnetite from the material. This result is optimistic in terms of the applicability of these materials, not only for tissue regeneration, but also to destroy cancer cells using the external magnetic field.
Źródło:
Engineering of Biomaterials; 2011, 14, no. 106-108; 17-20
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Composite material selection for a patient transfer assist device
Autorzy:
Dziaduszewska, M.
Zimna, M.
Powiązania:
https://bibliotekanauki.pl/articles/286125.pdf
Data publikacji:
2018
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
composites
fibers
selection
Źródło:
Engineering of Biomaterials; 2018, 21, 148; 89
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Potential of electrospinning technique to drug delivery system
Autorzy:
Dzierzkowska, E.
Stodolak-Zych, E.
Powiązania:
https://bibliotekanauki.pl/articles/284071.pdf
Data publikacji:
2018
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
electrospinning
drugs
fibers
Źródło:
Engineering of Biomaterials; 2018, 21, 148; 119
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Overview of polymer laminates applicable to elements of light-weight ballistic shields of special purpose transport means
Autorzy:
Sliwinski, M.
Kucharczyk, W.
Guminski, R.
Powiązania:
https://bibliotekanauki.pl/articles/30147051.pdf
Data publikacji:
2018
Wydawca:
Akademia Wojsk Lądowych imienia generała Tadeusza Kościuszki
Tematy:
aramid fibers
polyethylene fibers
polymeric laminates
bulletproof armor
ballistic plate
Opis:
The paper reviews and evaluates the possibility of using polymer fibrous composites for lightweight passive bulletproof armors for application in special-purpose means of transport. The shielding properties of the composite ballistic plates manufactured based on fibers commonly used for such applications: aramid (Kevlar, Twaron) and polyethylene ones (Spectra, Dyneema) as well as ceramic-laminate systems built based on the both above-mentioned ones have been characterized. Examples of application of lightweight, polymer ballistic laminates in armors and supplementary armors of special-purpose transport vehicles, illustrated by aircraft constructions, have been presented in accordance with literature sources and manufacturers' information.
Źródło:
Scientific Journal of the Military University of Land Forces; 2018, 50, 3(189); 228-243
2544-7122
2545-0719
Pojawia się w:
Scientific Journal of the Military University of Land Forces
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Shear behavior of steel or basalt fiber reinforced concrete beams without stirrup reinforcement
Autorzy:
Krassowska, J.
Kosior-Kazberuk, M.
Powiązania:
https://bibliotekanauki.pl/articles/297815.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
shear capacity
basalt fibers
steel fibers
SFRC
BFRC
two-span beams
Opis:
The paper presents the results of a comprehensive investigation aimed at studying the shear behavior of basalt or steel fiber-reinforced concrete (BFRC or SFRC) beams, as well as analyzing the possibility of using basalt or steel fibers as a minimum shear reinforcement. Two-span reinforced concrete beams with the cross-section of 8×16 cm and length of 200 cm and diversified spacing of stirrups were tested. Steel stirrups or alternatively steel or basalt fibers were used as a shear reinforcement. Steel fiber content was 80 and 120 kg/m3 and basalt fiber content was 2.5 and 5.0 kg/m3 . The shear behavior and/or bending capacity of SFRC and BFRC beams were studied. The result indicated that fibers can be safely used as a minimum shear reinforcement.
Źródło:
Technical Sciences / University of Warmia and Mazury in Olsztyn; 2017, 20(4); 391-404
1505-4675
2083-4527
Pojawia się w:
Technical Sciences / University of Warmia and Mazury in Olsztyn
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Coupled energy measurements in multi-core photonic-crystal fibers
Autorzy:
Klimek, J.
Powiązania:
https://bibliotekanauki.pl/articles/221407.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
photonic crystal fibers
multi-core fibers
optical fiber measurements
photonic sensors
Opis:
This paper outlines a measurement method of properties of microstructured optical fibers that are useful in sensing applications. Experimental studies of produced photonic-crystal fibers allow for a better understanding of the principles of energy coupling in photonic-crystal fibers. For that purpose, fibers with different filling factors and lattice constants were produced. The measurements demonstrated the influence of the fiber geometry on the coupling level of light between the cores. For a distance between the cores of 15 μm, a very low level (below 2%) of energy coupling was obtained. For a distance of 13 μm, the level of energy transfer toneighboring cores on the order of 2-4% was achieved for a filling factor of 0.29. The elimination of the energycoupling penomenon between the cores was achieved by duplicating the filling factor of the fiber. The coupling level was as high as 22% in the case of fibers with a distance between the cores of 8.5 μm. Our results can be used for microstructured-fiber sensing applications and for transmission-channel switching in liquid-crystal multi-core photonic fibers.
Źródło:
Metrology and Measurement Systems; 2013, 20, 4; 689-696
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Limiting fiber extensibility model for arterial wall
Autorzy:
Horny, L.
Zitny, R.
Chlup, H.
Konvickova, S.
Powiązania:
https://bibliotekanauki.pl/articles/286066.pdf
Data publikacji:
2008
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
arterial walls
fibers
biomaterials
Opis:
Arterial walls exhibit anisotropic, nonlinear and inelastic response to external loads. Moreover arterial wall is non–homogenous material with complicated internal structure. These facts make the question about the best material model for arterial wall still unanswered. Nowadays approach to building constitutive models is characterized by incorporating structural information when considering e.g. layers, fibers, fiber orientation or waviness. The most frequent method how to incorporate structural information is to regard arterial wall as a fiber reinforced composite. Considerations about preferred directions are subsequently implemented into the framework of continuum mechanics. Constitutive models are usually based on the theory of hyperelastic materials. Thus mechanical response of an arterial wall is supposed to be governed by a strain energy (or free energy) density function like in (1). The theory of hyperelastic materials is widely applied and studied in details in polymer science. Due to some phenomenological and structural similarities between rubber–like materials and biological tissues, methods of polymer physics are frequently applied in biomechanics, see Holzapfel [1]. Gent [2] suggested the new isotropic model for strain energy density function which was based on an assumption of limiting chain extensibility in polymer materials. The Gent model expresses strain energy y as a function of first invariant I1 of the right Cauchy-Green strain tensor as follows [formula]. In equation (1) μ denotes stress–like parameter, so–called infinitesimal shear modulus. Jm denotes limiting value of I 1 -3. The domain of logarithm requires [formula]. Thus, Jm can be interpreted as limiting value for macromolecular chains stretch. Horgan and Saccomandi in [3] suggested its anisotropic extension. They recently published modification based on usual concept of anisotropy related to fiber reinforcement, see paper [4]. Horgan and Saccomandi use rational approximations to relate the strain energy expression to Cauchy stress representation formula. We adopted this term with small modification as follows [formula] In (2) μ denote shear modulus. J m is the material parameter related to limiting extensibility of fibers. The similar definitional inequality like in (1) must be hold for logarithm in (2). Thus I 4 must satisfy [formula] denotes so called fourth pseudo–invariant of the right Cauchy-Green strain tensor which arises from the existence of preferred direction in continuum. It is worth to note that total number of invariants of the strain tensor is five in the case of transversely isotropic material and nine in the case of orthotropy. Details can be found in e.g. Holzapfel [5]. Model (2) presumes two preferred directions in continuum which are mechanically equivalent. Due to cylindrical shape of an artery we can imagine it as helices with same helix angel but with antisymmetric rientation. This is illustrated in the FIG. 1 I 4 can be expressed in the form given in (3) [formula] Stretched configuration of the tube is characterized by λ t , what denotes circumferential stretch and λ z what denotes axial stretch, respectively. Model (2) contains three material parameters. Above described μ, J m and β. The third material parameter β has the meaning of angle between fiber direction and circumferential axis. There are two families of fibers with angle ±β, however, I 4 is symmetric with respect to ±β. In order to verify capability of (2) to govern multi–axial mechanical response of an artery regression analysis based on previously published experimental data was performed. Details of experimental method and specimen can be found in Horny et al. [6]. Briefly we resume basic facts. Male 54–year–old sample of thoracic aorta underwent inflation test under constant axial stretch. The tubular sample was 6 times pressurized in the range 0kPa–18kPa–0kPa under axial pre–stretch λ z =1.3 and 3 times in the pressure range 0kPa–20kPa–0kPa under λ z =1.42, respectively. The opening angle was measured in order to account residual strains. Radial displacements were photographed and evaluated by image analysis. Regression analysis based on least square method gave the estimations for material parameters μ, Jm and β. The vessel was modeled as thick–walled tube with residual strains. The material was supposed to be hyperelastic and incompressible. No shear strains were considered. Fitting of material model was based on comparison of model predicted and measured values of internal pressure. Results are illustrated in FIG. 2. We can conclude that proposed material model fits experimental data successfully. Thus strain energy given in (2) is suitable to govern arterial response during its inflation and extension. Estimated values of parameters for material model (2) are as follows: μ =26kPa; J m =1.044; β=37.2°
Źródło:
Engineering of Biomaterials; 2008, 11, no. 81-84; 112-113
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of electrospinning conditions on PLA fibers morphology and UV degradation
Autorzy:
Kosowska, K.
Procner, M.
Szatkowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/284275.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
electrospinning
PLA fibers
degradation
Źródło:
Engineering of Biomaterials; 2017, 20, no. 143 spec. iss.; 60
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sterilization decomposition evaluation of composite materials based on carbon fibers for use in medicine
Autorzy:
Sedlacek, R.
Suchy, T.
Balik, K.
Sochor, M.
Sucharda, Z.
Powiązania:
https://bibliotekanauki.pl/articles/283909.pdf
Data publikacji:
2011
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
composites
carbon fibers
biomaterials
Źródło:
Engineering of Biomaterials; 2011, 14, no. 109-111 spec. iss.; 9-10
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of the nanohydroxyapatite and gelatin additives on selected properties of PDLG electrospun fibers
Autorzy:
Gwiazda, M.
Kijeńska, E.
Zalewska-Wierzbicka, K.
Swieszkowski, W.
Powiązania:
https://bibliotekanauki.pl/articles/284216.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
electrospun fibers
nanohydroxyapatite
gelatin
Źródło:
Engineering of Biomaterials; 2017, 20, no. 143 spec. iss.; 39
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Decoration of electrospun fibers with chitosan nanoparticles loaded with essential oils for bactericidal and anti-inflammatory application
Autorzy:
Wilgocki-Ślęzak, J.
Irusta, S.
Kyzioł, A.
Powiązania:
https://bibliotekanauki.pl/articles/285014.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
electrospun fibers
nanoparticles
chitosan fibres
Źródło:
Engineering of Biomaterials; 2017, 20, no. 143 spec. iss.; 32
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
PLA melt-blown fibrous structures for potential biomedical applications
Autorzy:
Rom, M.
Grzybowska-Pietras, J.
Fabian, J.
Jarzębowski, J.
Janicki, J.
Powiązania:
https://bibliotekanauki.pl/articles/286229.pdf
Data publikacji:
2011
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
melt-blown
fibers
PLA
nonwoven
Opis:
The paper presents results of experiments on formation of nonwoven fabrics from PLA biopolymer. Fibrous structures with parameters advantageous for application as a scaffold for tissue engineering were prepared from polylactide by melt-blown technology. Process optimization enables to obtain ultra-fine fibers. Sizes of pores formed in the material during melt-blown process can be tailored by formation of fibers of defined diameters.
Źródło:
Engineering of Biomaterials; 2011, 14, 104; 5-7
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł

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