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Wyświetlanie 1-15 z 124
Tytuł:
Effect of temperature and concentration on rheological properties of beetroot juice
Autorzy:
Kobus, Z.
Nadulski, R.
Guz, T.
Kamińska, I.
Powiązania:
https://bibliotekanauki.pl/articles/297841.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
beetroot juice
rheological properties
viscosity
Opis:
The rheological behaviour of beetroot juice as a function of soluble solid content (from 10oBx to 50oBx) at a wide range of temperatures (from 10oC to 60 oC) was studied. The measurements were made using rotational rheometer (Brookfield Engineering Laboratories: model LVDV-II+ PRO). The investigation showed that the beetroot juice was Newtonian in behaviour and the viscosity was changed from 0.77 mPa s to 28.4 mPa s. The Arrhenius-Guzman equation was used to calculate the values of flow activation energy. In order to evaluate the influence of soluble solid content two models were applied: the power law and exponential equation. A new equation was proposed to express the combined effect of temperature and concentration on beetroot juice viscosity.
Źródło:
Technical Sciences / University of Warmia and Mazury in Olsztyn; 2014, 17(1); 67-76
1505-4675
2083-4527
Pojawia się w:
Technical Sciences / University of Warmia and Mazury in Olsztyn
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental analysis of an effect of the nutrient type and its concentration on the rheological properties of the baker’s yeast suspensions
Autorzy:
Major-Godlewska, M.
Bitenc, M.
Karcz, J.
Powiązania:
https://bibliotekanauki.pl/articles/780053.pdf
Data publikacji:
2015
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
rheological properties
baker’s yeast suspension
Opis:
The aim of the study presented was to experimentally analyze an effect of the nutrient type and its concentration on the variability of rheological properties of the baker’s yeast suspensions for different time periods. Aqueous suspensions of the baker’s yeast of various concentration (solution I, without nutrient) and yeasts suspended in aqueous solution of sucrose or honey as nutrients with different concentration (solution II or solution III) were tested. Experiments were carried out using rotational rheoviscometer of type RT10 by a company HAAKE. The measurements were conducted for different time periods (from 1 h up to 144 h) at given fluid temperature. On the basis of the obtained data, rheological characteristics of the aqueous solution of baker’s yeast suspensions without and with nutrients of different sucrose or honey concentration were identified and mathematically described.
Źródło:
Polish Journal of Chemical Technology; 2015, 17, 3; 110-117
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on the rheological properties of CL-20/HTPB casting explosives
Autorzy:
Li, H.-X..
Wang, J-Y.
An, C.-W.
Powiązania:
https://bibliotekanauki.pl/articles/358310.pdf
Data publikacji:
2014
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
casting explosive
particle gradation
rheological properties
plasticizer
Opis:
The rheological properties of ε-2,4,6,8,10,12-hexanitro-2,4,6,8,10,12hexaazaisowurtzitane (CL-20)/hydroxy-terminated polybutadiene (HTPB) casting explosives with different formulations were tested and analyzed. The effects of both the weight percentage (wt.%) of CL-20 and its particle size, as well as the type and content of plasticizers, on the rheological properties of CL-20/HTPB casting explosives were investigated in detail. The results show that the viscosity and pseudoplasticity of CL-20/HTPB casting explosives increase with increasing wt.% of CL-20 and decreasing particle size. The gradation of CL-20 particle size also affects the rheological properties of the casting explosives. When the mixing ratio of 30 μm to 2 μm particles is 3:1, the viscosity reaches its lowest value and the non-Newtonian index reaches the maximum value of 0.5698. The viscosity, non-Newtonian index and impact sensitivity of the samples studied are clearly decreased by the addition of dioctyl adipate (DOA), dioctyl sebacate (DOS) or dibutyl phthalate (DBP). However, the three plasticizers do not appear to affect the thermal decomposition of CL-20/HTPB casting explosives. With respect to the rheological properties, mechanical properties and sensitivity, DOA is the optimum plasticizer to use in CL-20/HTPB casting explosives.
Źródło:
Central European Journal of Energetic Materials; 2014, 11, 2; 237-255
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rheology of StelliteTM 21 Alloy in Semi-Solid State
Autorzy:
Sołek, K.
Kapranos, P.
Powiązania:
https://bibliotekanauki.pl/articles/353949.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
thixoforming
rheological properties
viscosity
thixotropy
StelliteTM alloys
Opis:
The main objective of this study was to conduct an analysis of the rheological properties of StelliteTM 21 alloy in the semi-solid state, as the results could be used for identifying the appropriate temperature range for thixoforming of this alloy, and a secondary objective of the experimental work was the development of mathematical model of the alloy’s apparent viscosity. Such viscosity models are necessary for numerical simulations of the thixoforming processes. The StelliteTM 21 alloy exhibits high hardness and thus shaping in the semi-solid state is promising route of production of parts from this alloy. Within the confines of experimental work the measurement methods of the rheological properties at high temperatures was developed. They are based on the use of specially designed viscometer equipped with high temperature furnace.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 4; 1901-1908
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of anti-sedimentation agents on the technological parameters of cement slurry
Autorzy:
Kremieniewski, M.
Rzepka, M.
Stryczek, S.
Wiśniowski, R.
Powiązania:
https://bibliotekanauki.pl/articles/298824.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
sealing slurries
rheological properties
rheological models
superplastifiers
cement slurries
Opis:
Recently, the intensifying development of shale drilling has contributed to the more numerous realization of directional and horizontal boreholes. Moreover, such boreholes are more advantageous as they provide about 4 times higher production than in their vertical counterparts, give access to poorly drained areas, or production of already developed reservoir, where only a new borehole has to be introduced to the network. It should be stressed that the sealing of the casing columns is a challenge because of the restrictions set before drilling fluids used for sealing horizontal boreholes. Slurries play a special role while sealing horizontal boreholes and therefore their technological parameters and density should be adjusted to the geological-reservoir conditions. At the stage of designing slurries for sealing horizontal boreholes, the most important parameters are: sedimentation stability, zero water settling water settling and low filtration. Meeting these requirements was possible by selecting proper admixtures and additives, which in turn, is a guarantee of the uniform and homogeneous structure of fresh and hardened cement slurry. Thus formed cement sheath of bounded slurry should be impervious to gas and have good mechanical properties over the length of the sealing without any trends of anisotropy of the medium in particular points. Modification and designing specialist recipes for definite technological conditions lie, among others, in choosing proper slurry additives and admixtures. However, obtaining appropriate parameters for given conditions may be connected with a change of other parameters deciding about the efficiency of the sealing of a given horizon. Therefore while working out a new recipe for a slurry, the designer should account for the analytical results and influence of the applied agents on all of the parameters of slurry. This is the subject matter of the paper.
Źródło:
AGH Drilling, Oil, Gas; 2017, 34, 4; 945-957
2299-4157
2300-7052
Pojawia się w:
AGH Drilling, Oil, Gas
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of the properties of modified local asphalt binder by using styrene butadiene rubber (SBR) or low-density polyethylene (LDPE)
Autorzy:
Mustafa, Safa
Hameed, Mohammed Aziz
Dulaimi, Anmar
Powiązania:
https://bibliotekanauki.pl/articles/35562418.pdf
Data publikacji:
2022
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
asphalt binder
polymers
SBR
LDPE
rheological properties
Opis:
The influence of styrene butadiene rubber (SBR) or low-density polyethylene (LDPE) polymers on the characteristics of local asphalt binder was analyzed to characterize the rheological properties. The results indicated that the SBR or LDPE increased the softening point. The softening point was enhanced by around 35% when 9% of SBR was used in comparison to the unmodified asphalt, while there was a 15% increment when LDPE was used. The results also indicated that the SBR or LDPE decreased the penetration rate. The penetration decreases by around 36% when 9% of SBR is used compared to the neat asphalt, while a significant increment was 89% when 9% of LDPE is used. Additionally, when 9% SBR was employed, the ductility of the asphalt binder rose by roughly 73%, but 64% less ductility was seen when 9% LDPE was utilized. Finally, the addition of the additive has improved the penetration index, thus reducing the temperature sensitivity. Due to said above, SBR and LDPE are practical and promising modifiers that will be useful in enhancing the performance of the asphalt binder straightforwardly and efficiently.
Źródło:
Scientific Review Engineering and Environmental Sciences; 2022, 31, 3; 190-202
1732-9353
Pojawia się w:
Scientific Review Engineering and Environmental Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identification of the steel viscosity and dynamic yield stress for the numerical modelling of casting simulations in the semi-solid state
Autorzy:
Solek, K.
Powiązania:
https://bibliotekanauki.pl/articles/352515.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
continuous casting of steel
rheological properties
viscosity
thixoforming
Opis:
Conditions of some casting processes cause flow of both liquid and semi-liquid metal alloys inside the die cavity. Generally, the continuous casting, squeeze casting or thixoforming could be classified as such processes. Design or optimisation of casting technology using numerical simulations requires knowledge of the rheological properties. The main objective of the experimental work, presented in this publication, is an analysis of the viscosity of 1.2080 (X210Cr12) high carbon steel in liquid and semisolid state. The secondary purpose of the experimental work was a development of the viscosity models used in continuous casting and thixoforming simulations. The significant achievement of this particular study was identification of thixotropy phenomenon which occurs not only during thixoforming, but also during magnetohydrodynamic stirring in continuous casting processes.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 1; 195-200
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Grain of Hybrids Between Spelt (Triticum spelta L.) and Bread Wheat (Triticum aestivum L.) as a New Raw Material for Breadmaking
Autorzy:
Wiwart, Marian
Szafrańska, Anna
Suchowilska, Elżbieta
Powiązania:
https://bibliotekanauki.pl/articles/16538554.pdf
Data publikacji:
2023-08-28
Wydawca:
Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
Tematy:
bread wheat
spelt
hybrids
technological quality
rheological properties
Opis:
The aim of this study was to determine differences in the technological quality of grain of hybrids between spelt (Triticum spelta) and bread wheat (T. aestivum) as compared with the grain of their parental forms, i.e., modern bread wheat cultivars and spelt breeding lines. The content of basic nutrients in grain, milling quality of grain, rheological properties of dough, and bread quality were evaluated. Grain yields were around 18% lower in hybrid lines than in bread wheat. Gluten content was significantly higher in the grain of hybrid lines (34.0 vs. 27.5 g/100 g), and it did not differ significantly from that noted in spelt grain (36.1 g/100 g). The gluten index did not differ significantly between hybrid lines and bread wheat cultivars (77 vs. 85), and it was significantly higher than in spelt (43). Protein content was significantly higher in the flour obtained from hybrid lines than from bread wheat. Analyzed dough parameters in hybrid lines assumed intermediate values relative to parental forms, and protein parameters had a stronger discriminatory power than starch parameters. Bread made from the grain of single-cross hybrids between spelt and bread wheat was characterized by high quality and in many cases superior attributes relative to bread made from spelt flour. The study demonstrated that hybrids between T. spelta and T. aestivum can become a new, valuable source of grain for bread production.
Źródło:
Polish Journal of Food and Nutrition Sciences; 2023, 73, 3; 265-277
1230-0322
2083-6007
Pojawia się w:
Polish Journal of Food and Nutrition Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ temperatury na własności reologiczne termożeli chitozanowych
Influence of temperature on rheological properties of chitosan thermogels
Autorzy:
Zarzycki, R.
Modrzejewska, Z.
Owczarz, P.
Powiązania:
https://bibliotekanauki.pl/articles/2070079.pdf
Data publikacji:
2009
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
termożel chitozanowy
właściwości reologiczne
chitosan thermogels
rheological properties
Opis:
W pracy przedstawiono możliwości wytwarzania termożeli chitozanowych w oparciu o mleczan i octan chitozanu oraz b-glicerofosforan sodu. Roztwór soli chitozanowej formuje się w postać hydrożelu w temperaturze powyżej .35 st.>°C, a więc w warunkach fizjologicznych (poniżej tej temperatury pozostaje w postaci lepkiego roztworu).
Investigations of possible formation of thcrmogels based on chitosan lactate and chloride with sodium b-glycerophosphate are presented in the paper. Solution of chitosan salt is formed into hydrogel at temperature above 35°C, i.e. in physiological conditions (below this temperature it has a form of viscous solution).
Źródło:
Inżynieria i Aparatura Chemiczna; 2009, 1; 78-79
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Analysis of Rheological Properties of Inconel 625 Superalloy Feedstocks Formulated with Backbone Binder Polypropylene System for Powder Injection Molding
Autorzy:
Gökmen, U.
Türker, M.
Powiązania:
https://bibliotekanauki.pl/articles/351256.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
powder injection molding
feedstock
rheological properties
Inconel 625
Opis:
Binder formula is one of the most significant factors which has a considerable influence on powder injection molding (PIM) processes. In the study, rheological behaviors and properties of different binder systems containing PIM feedstocks, Inconel 625 powder commonly used in space industry, were investigated. The feedstocks were prepared 59%-69% (volume) powder loading ratios with three diversified binder systems by use of Polypropylene as backbone binder. The average particle size of the Inconel 625 powder used was 12.86 microns. Components used in the binder were mixed for 30 minutes as dry in three dimensional mixing to prepare binder systems. Rheological features of the feedstock were characterized by using a capillary rheometer. Viscosities of the feedstocks were calculated within the range of 37.996-1900 Pa.s based on the shear rate, shear stress, binder formula and temperature. “n” parameters for PIM feedstocks were determined to be less than 1. Influences of temperature on the viscosities of the feedstocks were also studied and “Ea” under various shear stresses were determined within the range of 24.41-70.89 kJ/mol.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 4; 1937-1944
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of controlled dispersion on rheology of swelling clay suspensions in the presence of coal flotation reagents
Autorzy:
Zhang, M.
Cao, Y.
Chen, Y.
Yu, W.
Powiązania:
https://bibliotekanauki.pl/articles/110619.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
swelling clay
rheological properties
controlled dispersion
flotation reagents
Opis:
Swelling clay minerals, which are innately capable of dispersing into thin flakes in water, can significantly depress coal flotation. Some researchers partially attribute depression to pulp viscosity increments. This study sought to understand the role of swelling clay minerals in fine coal flotation, by investigating the rheological behavior of bentonite suspensions under controlled and uncontrolled dispersion conditions. The effect of collector, frother, and solution pH on rheological properties of the pulp was studied. Findings showed that at a natural pH, Newtonian flow properties were displayed when bentonite was directly added into a swelling suppressed solution containing calcium ions. The same process was repeated under uncontrolled conditions, and the suspensions transferred from Newtonian to non-Newtonian flows with pseudo-plastic characteristics, depending on the solid density. Further, pH value, methyl isobutyl carbinol (MIBC) and kerosene had the potential to alter the rheological behavior of controlled and uncontrolled systems, especially pH value in the uncontrolled system.
Źródło:
Physicochemical Problems of Mineral Processing; 2017, 53, 2; 1148-1160
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of measuring process properties on phosphate rock slurry rheology based on Brookfield method
Autorzy:
Chen, Aoao
Zhang, Qin
Powiązania:
https://bibliotekanauki.pl/articles/2175436.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
phosphate rock
grinding
concentration
rheological properties
apparent viscosity
Opis:
This research aims to explore how the flotation process conditions influence the rheological properties of phosphate rock slurry. The apparent viscosity of phosphate rock slurry was measured by Brookfield DVNext rheometer. Different mineral types, grinding time, slurry mass concentration and reagent systems were adopted to study the viscosity behavior of phosphate rock slurry. The results showed that under the same conditions, the apparent viscosity of apatite and dolomite slurry was basically the same, and the apparent viscosity of the slurry after mixing the two minerals was basically the same as that of single mineral. For the same slurry concentration, the mineral particle size had a significant effect on the rheological behavior of the slurry, and its apparent viscosity increased exponentially with the decrease of particle size. In addition, phosphate rock slurry showed shear thickening fluids characteristics when the slurry concentration is 20%-40%, but changed to pseudoplastic fluid at high concentration (60%). Sulfuric acid as pH regulator and inhibitor had little effect on the rheology of slurry; when GJBW and NaOL were added as collectors, the rheology of slurry changed, and the effect of GJBW was more obvious.
Źródło:
Physicochemical Problems of Mineral Processing; 2022, 58, 6; art. no. 156202
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Physico-chemical properties of chitosan composites with synthetic polymers and inorganic additives
Autorzy:
Lewandowska, Katarzyna
Powiązania:
https://bibliotekanauki.pl/articles/1034867.pdf
Data publikacji:
2015
Wydawca:
Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Tematy:
AFM
chitosan
poly(vinyl alcohol)
polyvinylpyrrolidone composites
rheological properties
Opis:
In the present study the results of rheological measurements and atomic force microscopy (AFM) of polymer composites with montmorillonite (MMT) are presented. Chitosan is blended with synthetic polymers and inorganic additives in acetic acid solution and this solution is cast to prepare the mixture film. Flow measurements were made on a Bohlin Visco 88 rotary viscometer in the temperature range 25ºC-40ºC. The apparent shear viscosity and rheological parameters of the unmodified components and their composites were determined and discussed. Polymer films were examined using a Scanning Probe Microscopy SPM production Veeco. The obtained results suggest that the modification of several properties of polymer composites is a consequence of the interaction between the polymeric components and inorganic additives.
Źródło:
Progress on Chemistry and Application of Chitin and its Derivatives; 2015, 20; 162-169
1896-5644
Pojawia się w:
Progress on Chemistry and Application of Chitin and its Derivatives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rheological properties of chitosan blends with partially hydrolyzed polyacrylamide in different solvents
Autorzy:
Lewandowska, Katarzyna
Powiązania:
https://bibliotekanauki.pl/articles/1035377.pdf
Data publikacji:
2012
Wydawca:
Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Tematy:
apparent shear viscosity
chitosan
polyacrylamide
polymer blends
rheological properties.
Opis:
In the present paper, the results of rheological measurements in solutions of chitosan (Ch) with partially hydrolyzed polyacrylamide (HPAM) are presented. Aqueous acetic acid, lactic acid and aqueous acetic acid/NaCl were used as solvents for chitosan, HPAM and Ch/HPAM solution blends. The criterion of miscibility of solution blends, based on the additivity rule of apparent shear viscosity (ηa) has been discussed. The rheological parameters from power law (Ostwald de Waele model) and activation energy of viscous flow (Ea) have been calculated from the flow curves and Arrhenius plots, respectively. It was found that studied polymer solutions exhibited the non-Newtonian behaviour with shear-thinning and/or shear-thickening areas. The final result depends on the thermodynamic goodness of the solvent and on the blend composition.
Źródło:
Progress on Chemistry and Application of Chitin and its Derivatives; 2012, 17; 53-62
1896-5644
Pojawia się w:
Progress on Chemistry and Application of Chitin and its Derivatives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Właściwości wysokotemperaturowe lepiszczy asfaltowych w badaniu cyklicznego pełzania z odprężeniem (MSCR)
Bitumen high temperature properties characterised by multiple stress creep recovery test (MSCR)
Autorzy:
Król, J.
Matraszek, K.
Powiązania:
https://bibliotekanauki.pl/articles/144784.pdf
Data publikacji:
2012
Wydawca:
Stowarzyszenie Inżynierów i Techników Komunikacji Rzeczpospolitej Polskiej
Tematy:
asfalt
cykliczne pełzanie
właściwości reologiczne
bitumen
multiple creep
rheological properties
Opis:
W artykule opisano metodę pomiaru właściwości wysokotemperaturowych asfaltów stosowaną do oceny rodzaju funkcjonalnego (PG) lepiszczy wg Superpave. Przedstawiono wyniki badań asfaltu drogowego i asfaltów modyfikowanych poddanych badaniu cyklicznego pełzania z odprężeniem (MSCR). Przeanalizowano wyniki badań, wskazując możliwości zastosowania oceny sprężystości oraz podatności lepiszcza do określania obecności modyfikatora typu elastomerowego w asfaltach modyfikowanych polimerami.
Method for characterised high temperature properties of bituminous binder apply for Superpave PG grade are described. Bituminous binder and polymer modified bitumen were tested by multiple stress creep recovery procedure (MSCR). Results of recovery and non-recoverable creep compliance were analysed in aspect to check sufficient modifier content.
Źródło:
Drogownictwo; 2012, 10; 321-324
0012-6357
Pojawia się w:
Drogownictwo
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 124

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