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Wyświetlanie 1-3 z 3
Tytuł:
Wpływ warunków przechowywania na morfologię i wielkość cząstek proszku miodowego
The effect of storage conditions on the morphology and particle size of honey powder
Autorzy:
Samborska, K.
Jedlinska, A.
Dudek, O.
Kaminska-Dworznicka, A.
Powiązania:
https://bibliotekanauki.pl/articles/808946.pdf
Data publikacji:
2017
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Opis:
Proszek miodowy otrzymany poprzez suszenie metodą rozpyłową z dodatkiem maltodekstryny przechowywano przez 9 tygodni w różnych warunkach (temperatura/ /wilgotność względna: 4°C/40–45%, 25°C/40–50%, 38°C/80%). Bezpośrednio po suszeniu oraz po 1, 5 i 9 tygodniach przechowywania analizowano morfologię (mikroskop skaningowy) i wielkość cząstek (analiza obrazu) oraz oznaczano zawartość i aktywność wody. Stwierdzono, że najkorzystniejsze warunki przechowywania, które pozwoliły na zachowanie formy sypkiego proszku o nieznacznie zmienionej morfologii cząstek oraz stałej zawartości i aktywności wody przez cały okres przechowywania to 4°C/40–45%. Proszek przechowywany w temperaturze 25°C charakteryzował się stabilnymi wartościami zawartości i aktywności wody, jak również tylko nieznacznie zmienioną morfologią, ale tylko do 5. tygodnia przechowywania, po dłuższym przechowywaniu nastąpiły znaczne zmiany morfologii (tworzenie skupisk) oraz obserwowano zbrylanie proszku na skutek wzrostu zawartości i aktywności wody. Proszek przechowywany w temperaturze 38°C już po tygodniu całkowicie zbrylił się, tworząc twardą strukturę upłynniającą się w czasie dalszego przechowywania.
The influence of storage conditions (4°C/relative humidity RH 40–45%; 25°C/ /RH 40–50%; 38°C/RH 80%) and time (1, 5, 9 weeks) on the morphology and particle size of honey powder was investigated. Honey powder was produced in a laboratory spray drier Anhydro (Denmark), with the use of maltodextrin DE15 as a carrier. Spray drying of honey/maltodextrin aqueous solution (honey solids to maltodextrin solids ratio 50:50) was performed at inlet/outlet air temperature 180/80°C, feed rate 1 ml·s–1, atomization disk speed 39000 rpm. Powders particle morphology and size distribution were analyzed based on microphotographs (Hitachi TM 3000 electron microscope, Multiscan software) Water content and activity in powders after subsequent storage periods were also determined. Directly after drying powder was easy flowing, without caking. Particles were regular and scattered, particle size ranged from 8 to 33 μm, what was typical for spray dried materials. During storage the changes of powder morphology and particle size were observed, depending on storage conditions. Storage at 4°C did not affect powder morphology substantially. The powder stored at 25°C was characterized also by slightly changed morphology, but only until 5 weeks of storage. After this time significant changes in morphology were observed (aggregation), along with powder caking. The powder stored at 38°C was completely caked after 1 week of storage, turning into a hard structure that liquefied upon continued storage. A relationship between water content and water activity of powders and their morphology changes during storage was observed. Water content and activity of samples stored at 4°C did not change significantly during storage, which was related to the lack of caking. In powders stored at 25 and 38°C water content was statistically significantly higher after 5 weeks of storage, at the same time a noticeable caking of material was observed at water content of 7.1 ±2.4 (25°C), and its liquefaction at water content 11.4 ±3.1 (38°C). In case of powders stored at 38°C, statistically significant differences in water activity after each storage period were observed, which was associated with intensive caking after 1 week and subsequent liquefaction after subsequent stages. The most favorable conditions for honey powder storage, which allowed to keep the powder form with slightly altered particle morphology and constant water content and activity after 9 weeks of storage, was 4°C/40–45%. Analysis of morphology, water content and activity can be useful in controlling the quality of powders during storage. Difficulties in the application of image analysis in controlling powders quality during storage were noted, due to the aggregation of powder particles in larger, difficult to trace clusters. The dependence between water content and activity and powders morphology was observed – a significant increase in water content and activity was confirmed by caking and even liquefaction.
Źródło:
Zeszyty Problemowe Postępów Nauk Rolniczych; 2017, 591
0084-5477
Pojawia się w:
Zeszyty Problemowe Postępów Nauk Rolniczych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modern tendencies in the design of autonomous utility vehicles
Autorzy:
Mężyk, A.
Czapla, T.
Klein, W.
Krzystała, E.
Gembalczyk, G.
Domagała, D.
Dudek, O.
Powiązania:
https://bibliotekanauki.pl/articles/245027.pdf
Data publikacji:
2015
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
autonomous vehicles
machine design
utility vehicles
hybrid drive
Opis:
The article discusses the role of the modern approach to the design of autonomous utility vehicles. The study has been exemplified by a currently designed multi-purpose hybrid engineer vehicle. The article covers the application of modern hybrid drive and the suspension allowing for the regulation of the tension wheel. The drive system used in the described vehicle is a serial type. In contrast to the conventional solutions used so far in a similar vehicle, this system eliminate heavy and difficult parts to produce (e.g., gears) which allows to significant reduction of a vehicle's weight. The suspension system is based on the classical concept - with a torsional shafts. A movable tension wheel is an innovative element, which has been used in this suspension system. When the wheel is in the lower position the area of pressure increased so the force exerted on the ground is less. This option is useful in difficult, muddy off-road conditions. The Volvo Company wants to apply similar capabilities in their prototype diggers. In the article, the importance of the external appearance of the vehicle has been considered as well. A removable cab allows the remote control of the vehicle at any time and the same has been provided as an example of a modern solution concerning the external appearance of the vehicle.
Źródło:
Journal of KONES; 2015, 22, 1; 227-234
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Alginate Biopolymer Coatings Obtained by Electrophoretic Deposition on Ti15Mo Alloy
Autorzy:
Szklarska, M.
Dercz, G.
Simka, W.
Dudek, K.
Starczewska, O.
Łężniak, M.
Łosiewicz, B.
Powiązania:
https://bibliotekanauki.pl/articles/1360727.pdf
Data publikacji:
2014-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.18.Fx
87.85.J-
82.35.Pq
87.15.rp
81.15.-z
Opis:
In this work, the electrophoretic deposition method has been developed for the fabrication of bioactive alginate coatings on the surface of Ti15Mo implant alloy. Thin ZnO film was deposited cataphoretically as the interlayer prior to anaphoretic deposition of alginate (Alg) which was performed from aqueous solution containing 1 g $dm^{- 3}$ of NaAlg at room temperature. The deposition voltage and time varied in the range 20-50 V and 30-120 min, respectively. The microstructure of Alg coatings was studied by scanning electron microscope, and the surface roughness was analysed using atomic force microscopy. Structure was studied by grazing incidence X-ray diffraction. Chemical composition and functional group were examined using energy dispersive spectrometry and attenuated total reflectance Fourier transform infrared spectroscopy methods, respectively. It was found that controlling the deposition conditions it is possible to obtain amorphous Alg coatings of variable thickness and porosity. Mechanism of electrophoretic deposition of bioactive Alg coatings on the Ti15Mo alloy surface was discussed.
Źródło:
Acta Physica Polonica A; 2014, 125, 4; 919-923
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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