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Tytuł:
Application of magnetic separation and reverse anionic flotation to concentrate fine particles of iron ore with high sulfur content
Autorzy:
Dehghani, Fahimeh
Khosravi, Rasoul
Pazoki, Amir
Kebe, Moustapha
Jahanian, Reza
Siavoshi, Hossein
Ghosh, Tathagata
Powiązania:
https://bibliotekanauki.pl/articles/2146898.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
iron ore
fine particles
magnetic separation
reverse anionic flotation
sulfur
Opis:
The sulfur content in iron ore causes technical problems in the process of sintering iron ore in steel and alloys, and environmental problems in discharging the tailing. The major challenge in the iron ore processing plant is handling the finer particles. The key objectives of this research included the concentration of Band Narges Mine iron ore (< 150 μm) as well as the reduction of the sulfur content to achieve a marketable product. First, the mineralogical characterization of iron ore was established, which showed that Fe3O4, SiO2, and CaO were the predominant minerals in the ore body. Moreover, magnetite particles with a size of < 150 μm were mainly locked into the associated gangue mineral. Second, metallurgical experiments were conducted, including magnetic separation and froth flotation. To increase the iron grade and recovery and decrease the sulfur content, two separate process flowsheets were tested, three steps of magnetic separation with a magnetic field strength of 2000 G were used in the first process flowsheets, followed by regrinding to < 74 μm and application of a three-stage reverse flotation. The overall iron grade and recovery were 76.38% and 67.9%, respectively, from this flowsheet. A five-stage successive reverse flotation followed by three stages of magnetic separation at 1000 G was carried out in the second flowsheet. The final recovery and grade of iron for this flowsheet were 77.15% and 64.3%, respectively. The ultimate content of sulfur was estimated at 0.74%.
Źródło:
Physicochemical Problems of Mineral Processing; 2022, 58, 3; art. no. 145420
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of hall currents on thermal instability of dusty couple stress fluid
Autorzy:
Aggarwal, A. K.
Verma, A.
Powiązania:
https://bibliotekanauki.pl/articles/240229.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
couple-stress fluid
dust particles
hall currents
stationary convection
oscillatory modes
magnetic field
ziarna pyłu
konwekcja
pole magnetyczne
Opis:
In this paper, effect of Hall currents on the thermal instability of couple-stress fluid permeated with dust particles has been considered. Following the linearized stability theory and normal mode analysis, the dispersion relation is obtained. For the case of stationary convection, dust particles and Hall currents are found to have destabilizing effect while couple stresses have stabilizing effect on the system. Magnetic field induced by Hall currents has stabilizing/destabilizing effect under certain conditions. It is found that due to the presence of Hall currents (hence magnetic field), oscillatory modes are produced which were non-existent in their absence.
Źródło:
Archives of Thermodynamics; 2016, 37, 3; 3-18
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect Of Heat-Treatment On Microstructure And Magnetic Properties Of Nanocrystallized Mn-Zn Ferrite Powders
Wpływ obróbki cieplnej na mikrostrukturę i właściwości magnetyczne nanokrystalicznych proszków ferrytu Mn-Zn
Autorzy:
Lee, W. H.
Hong, C. S.
Chang, S. Y.
Powiązania:
https://bibliotekanauki.pl/articles/351552.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
high energy ball milling
nanosized particles
crystallite size
magnetic properties
frezowanie kulowe
nanocząstki
wielkości krystalitów
właściwości magnetyczne
Opis:
The initial ferrite powders were subjected to high energy ball milling at 300rpm for 3h, and subsequently heat-treated at 573-1273K for 1h. Based on the observation of microstructure and measurement of magnetic properties, the heat-treatment effect was investigated. The size of initial powders was approximately 70μm. After milling, the powders with approximately 230nm in size were obtained, which were composed of the nano-sized particles of approximately 15nm in size. The milled powders became larger to approximately 550nm after heat-treatment at 973K. In addition, the size of particles increased to approximately 120nm with increasing temperature up to 973K. The coercivity of initial powders was almost unchanged after milling, whereas the saturation magnetization increased. As the heat-treatment temperature increased, the saturation magnetization gradually increased and the maximum coercivity was obtained at 773K.
Źródło:
Archives of Metallurgy and Materials; 2015, 60, 2B; 1347-1350
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of the magnetic particles concentration on the ferro-oil’s dynamic viscosity in presence of an external magnetic field in the aspect of shear rate’s variations
Autorzy:
Frycz, M.
Horak, W.
Powiązania:
https://bibliotekanauki.pl/articles/246160.pdf
Data publikacji:
2013
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
ferro-oil
dynamic viscosity
magnetic particles concentration
rheometer
slide journal bearings
Opis:
The purpose of this study is to determine the effect of changes in the concentration of magnetic particles in ferrooil to change its physical properties, in particular the dynamic viscosity in a constant external magnetic field in terms of changes in shear rate and changes in the intensity of that field. Rheological studies were carried out on Physica MCR 301 rheometer in the “plate -plate” measurement system with an adapter to magneto-rheological studies MRD 180/1T. The applied adapter enable to obtain almost homogeneous distribution of magnetic field strength. Thermal stabilization was carried out by a water jacket in a closed chamber and controlling the nature of the magnetic field was conducted by current’s changes. Tests were performed for shear rate’s changes from 0 to 1000 1/s as regards changes an external magnetic field intensity 0–700 mT. The selected concentrations of magnetic particles in a ferro-oil were 1, 2, 4, 6 and 8% and the tested ferrofluid was product of FerroTec of Unterensingen (Germany), which is a mixture of colloidal mineral motor oil Penzzoil’s LongLife Gold's SAE 15W-40 with Fe3O4 magnetic particles and the surfactant. The paper presents, in the form of graphs, the changes of ferro-oil’s dynamic viscosity as a function of shear rate and concentration of magnetic particles in the aspect of external magnetic field’s intensity changes. The results of research were also subjected to analysis. The obtained characteristics of ferro-oil’s viscosity show clear evidence of non-Newtonian properties of the liquids. There is observed progression of these properties with increasing of magnetic particles concentration. This fact indicates the essential effect of the addition mentioned particles to the change of the ferro-oil’s viscosity characteristics.
Źródło:
Journal of KONES; 2013, 20, 3; 139-144
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of the magnetic particles concentration on the ferro-oil’s dynamic viscosity in presence of an external magnetic field in the aspect of temperature changes
Autorzy:
Czaban, A.
Frycz, M.
Horak, W.
Powiązania:
https://bibliotekanauki.pl/articles/247080.pdf
Data publikacji:
2013
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
ferro-oil
dynamic viscosity
magnetic particles concentration
temperature changes
external magnetic field
Opis:
There is presented an effect of the changes of the concentration of magnetic particles included in the ferro-oil on its dynamic viscosity in the presence of external magnetic field in this paper. The study was conducted in the context of temperature’s changes. The authors assume that the concentration of magnetic particles in ferro-oil can significantly affects its basic physical properties as dynamic viscosity, as well as the operational properties of journal sliding bearings ferro-oil’s lubricated. The equally significant as the above mentioned properties may affect the external environmental conditions of operation, especially temperature changes. In this context, an important technique’s issue appears to determine the principles of selection of optimal concentration of above mentioned particles according to the existing environmental conditions of its operation, or the expectations laid against the operation of the devices. Rheological studies were carried out on Physica MCR 301 rheometer in the “plate-to-plate” measurement system with an adapter to magneto-rheological studies MRD 180/1T. Thermal stabilization was carried out by a water jacket in a closed chamber and controlling the nature of the magnetic field was conducted by current’s changes. Tests were performed for four selected temperature range of 60º, 70º, 80º and 90ºC as regards changes an external magnetic field intensity 0-700 mT. The selected concentrations of magnetic particles in a ferro-oil were 1, 2, 4, 6 and 8%.
Źródło:
Journal of KONES; 2013, 20, 2; 55-60
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Eksperymentalna metoda wyznaczenia współczynników podatności magnetycznej χ ferroolejów o różnym stężeniu cząstek magnetycznych
Experimental method of determining the magnetic susceptibility coefficient χ for ferro-oils with different concentrations of magnetic particles
Autorzy:
Frycz, M.
Anioł, P.
Powiązania:
https://bibliotekanauki.pl/articles/187774.pdf
Data publikacji:
2014
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
ferroolej
współczynnik podatności magnetycznej
stężenie cząstek magnetycznych
ferro-oil
magnetic susceptibility coefficient
magnetic particles concentration
Opis:
W niniejszym artykule została zaprezentowana budowa stanowiska badawczego do eksperymentalnego wyznaczenia współczynników podatności magnetycznej χ ferroolejów o różnym stężeniu cząstek magnetycznych oraz została przedstawiona analiza wyników pozyskanych tą metodą. Zewnętrzne, jednorodne, stałe pole magnetyczne uzyskano za pomocą dwóch płytek stałych magnesów umieszczonych równolegle, a zmiany wartości pola zadawano poprzez możliwość kontrolowanego przemieszczania tych magnesów względem siebie. Pomiędzy magnesami umieszczona została próbka badanego oleju, a wartości natężenia pola magnetycznego pomierzono z użyciem miernika indukcji pola magnetycznego Smart Magnetic Sensor SMS 102. Badaniom poddano ferrooleje o wybranych stężeniach cząstek magnetycznych, tj.: 8%, 6%, 4% oraz 2% objętościowo.
This paper presents the construction of an experimental test bench to determine the magnetic susceptibility coefficients χ of ferro oils with different concentrations of magnetic particles, and also the analysis of the results that were obtained by this method. The outer, homogeneous, constant magnetic field was obtained by means of the two plates of permanent magnets arranged in parallel, and changes the field value were carried out by the possibility of controlled movement of the magnets relative to each other. Samples of lubricants were placed between the magnets, and the magnetic field strength was measured by using the magnetic induction SMS Smart Magnetic Sensor 102. Ferro oils with selected concentrations of magnetic particles of 8%, 6%, 4%, and 2% were studied.
Źródło:
Tribologia; 2014, 3; 29-38
0208-7774
Pojawia się w:
Tribologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fully coupled multi-physics modeling of the multi-type magnetic particles dynamic behavior in low intensity magnetic separator
Autorzy:
Wang, Feiwang
Zhao, Hongming
Dai, Huixin
Du, Wuxing
Powiązania:
https://bibliotekanauki.pl/articles/109730.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
multi-physics model
low-intensity magnetic separator
magnetic particles
dynamic behaviour
Opis:
Studying the dynamic behavior of magnetic particle suspensions in the low intensity magnetic separator has important implications for various mineral beneficiation processes. A new approach for fully coupled multi-physics modeling of the dynamic behavior of multi-type magnetic particles (MTMPs) is developed in the study. In this model, the particle tracing module is employed to identify and determine individual particle trajectories in the fluid and magnetic field, which are modelled through the COMSOL Multiphysics. The results show that the different arrangements of the permanent magnet assembly and the volume percentage of interlocked particles affect the dynamic behavior of MTMPs and the efficiency of the separation. The model is compared with experiments and the particle capture theory and the correctness of the solution obtained from COMSOL is demonstrated. The model gives new possibilities to control, optimise, and develop the process of LIMS.
Źródło:
Physicochemical Problems of Mineral Processing; 2019, 55, 1; 163-172
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Haemocompatibility and cytotoxic studies of non-metallic composite materials modified with magnetic nano and microparticles
Autorzy:
Szymonowicz, M.
Rybak, Z.
Fraczek-Szczypta, A.
Paluch, D.
Rusak, A.
Nowicka, K.
Blazewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/306490.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
nanokompozyty
cząstki magnetyczne
hemoliza
żywotność komórkowa
koagulacja
nanocomposite
magnetic particles
polysulfone
haemolysis
cell viability
coagulation systems
Opis:
Purpose: Preventing the formation of blood clots on the surface of biomaterials and investigation of the reasons of their formation are the leading topics of the research and development of biomaterials for implants placed into the bloodstream. Biocompatibility and stability of a material in body fluids and direct effect on blood cell counts components are related both to the structure and physico-chemical state of an implant surface. The aim of this study was to determine haemocompatibility and cytotoxicity of polysulfone-based samples containing nano and micro particles of magnetite (Fe3O4). Methods: The polysulfone-based samples modified with nanometric and micrometric magnetite particles were examined. Physicochemical properties of the composites were determined by testing their wettability and surface roughness. The action of haemolytic, activation of coagulation system and cytotoxicity of composites was evaluated. Results: Wettability and roughness of materials were correlated with nanoparticles and microparticles content. In the tests of plasma coagulation system shortening of activated partial thromboplastin time for polysulfone with nano magnetite and with micro magnetite particles was observed in comparison with pure polysulfone. Prothrombine time and thrombine time values as well as fibrinogen concentration were unchanged. Haemolysis values were normal. Morphology and viability of cells were normal. Conclusions: Composites made from polysulfone modified with nanoparticles and microparticles of magnetite cause neither haemolytic nor cytotoxic reaction. These composites evoke plasma endogenous system activation.
Źródło:
Acta of Bioengineering and Biomechanics; 2015, 17, 3; 49-58
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hydrodynamic and hydromagnetic stability of two superposed elastico – viscous fluids of different permeability with dust in porous medium
Autorzy:
Singh, M.
Mehta, C. B.
Powiązania:
https://bibliotekanauki.pl/articles/266188.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
Rayleigh-Taylor instability
magnetic field
suspended particles
Walters' B fluid
different permeability and porous medium
pole magnetyczne
materiały porowate
lepkość płynu
Opis:
Rayleigh-Taylor instability of two superposed Walters’ B has elastico-viscous fluids in a uniform magnetic field through a porous medium with different permeability been studied to include the suspended (dust) particles effect. Using normal mode technique a dispersion relation has been derived. The stability analysis has been carried out. The magnetic field stabilizes the unstable configuration for the wave number band K > K* in chich the system is unstable in the absence of the magnetic field. It is also found that for a potential stable arrangement for Walters B’ elastico-viscous fluids of different permeabilities in the presence of suspended particles through a porous medium the system is stable, whereas in the potentially unstable case instability of the system occurs.
Źródło:
International Journal of Applied Mechanics and Engineering; 2015, 20, 2; 407-416
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of magnetic particles concentration in ferrooil on its magnetic susceptibility coefficient χ
Autorzy:
Frycz, M.
Anioł, A.
Powiązania:
https://bibliotekanauki.pl/articles/241625.pdf
Data publikacji:
2014
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
ferro-oil
magnetic particles concentration
magnetic susceptibility coefficient
Opis:
The purpose of this article is to determine the effect of the concentration of magnetic particles in ferro-oil on the value of its magnetic susceptibility coefficient χ. Determination of the flow and operating parameters of slide journal bearings lubricated with ferro-oils requires, inter alia, designation the first magnetization N and the magnetic induction B vector components, dependent on the magnetic propertis of the lubricant. The fundamental problem lies in the inability to make direct accurate measurement of magnetic induction in the lubricating gap of slide bearing and its solution is to determine it on the analytical and numerical way. A key issue for the accuracy of such solutions is to obtain reasonably accurate values of magnetic susceptibility χ. This article attempts to determine these values and estimate their relationship with the concentration of magnetic particles concentration in ferro-oil being potential lubricant above-mentioned bearings. In this paper, the authors present the characteristic of experimental test benches to determine the coefficients of the magnetic susceptibility. They present method of determining this value from obtained measurement data and analyse the impact of the magnetic particles concentration in ferro-oil on its magnetic susceptibility values. Tests were performed for selected concentrations of magnetic particles in ferro-oil ranging: 2%, 4%, 6% and 8% and the tested ferro-oil was product from Unterensingen FerroTec Company (Germany) which is a mixture of colloidal mineral engine oil LongLife Gold Penzzoil class SAE 15W-40 with addition of Fe3O4 magnetic particles and a surfactant.
Źródło:
Journal of KONES; 2014, 21, 4; 111-117
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Implantation of superabsorbent polymer by magnetic iron oxide particles
Autorzy:
Grzesiak, Maciej
Szajnecki, Łukasz
Powiązania:
https://bibliotekanauki.pl/articles/2079886.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
superabsorbents
hydrogels
magnetic particles
swelling properties
Opis:
The aim of this research was to optimise methods of magnetic particles of iron oxides implantation into superabsorbent polymer based on partially neutralized acrylic acid (SAc/AAc) crosslinked with ethylene glycol dimethacrylate (EGDMA). The structure of the obtained materials was confirmed by infrared spectroscopic analysis (FT-IR/ATR). The quality of implantation process was evaluated on the basis of microscopy images. Swelling properties of the obtained implanted materials were also determined.
Źródło:
Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia; 2019, 74, 2; 101-113
2083-358X
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of magnetic particles concentration in ferro-oil on values of friction force and coefficient of friction of slide journal bearing
Autorzy:
Frycz, M.
Miszczak, A.
Powiązania:
https://bibliotekanauki.pl/articles/243124.pdf
Data publikacji:
2017
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
ferro-oil
dynamic viscosity
magnetic particles concentration
friction force
friction coefficient
lepkość dynamiczna
stężenie cząstek magnetycznych
siła tarcia
współczynnik tarcia
Opis:
This article has been focused on the analysis of changes in friction force as well as coefficient of friction of slide journal bearing in terms of the concentration of magnetic particles in the lubricating ferro-oil. There has been present an analytical and numerical calculation model based on experimentally determined physical quantities describing the dependence of ferro-oil’s viscosity on fundamental parameters such as temperature, pressure or external magnetic field in the paper. Numerical calculations of the dimensionless friction force as well as the dimensionless friction coefficient were performed by solving the Reynold’s type equation using the finite difference method using Mathcad 15 and own calculation procedures. The obtained results has been presented in the form of a series of graphs that take into account: the influence of external magnetic field, corrections related to the influence of pressure changes, corrections related to the influence of temperature changes and finally corrections related to non-Newtonian ferro-oil properties. An analysis of the obtained characteristics has been made so the observations and conclusions were drawn regarding optimum magnetic particle content in the ferro-oil lubricating the sliding journal bearing.
Źródło:
Journal of KONES; 2017, 24, 1; 143-150
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kinetic energy partitions in electron–ion PIC simulations of ABC fields
Autorzy:
Chen, Qiang
Powiązania:
https://bibliotekanauki.pl/articles/2202567.pdf
Data publikacji:
2023
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
acceleration of particles
magnetic reconnection
relativisitc processes
simulations
Opis:
We explore the kinetic energy partitions between electrons and ions in the 2-D magnetostatic equilibria called Arnold–Beltrami–Childress (ABC) fields, using particle-in-cell (PIC) numerical simulations. We cover a wider range of ion–electron temperature combinations and get different results compared to previous studies of the Harris-layer-type magnetic reconnection simulations. We find that the initial ion–electron enthalpy ratio is an important indicator. The particle species that dominates the total enthalpy will also dominate the kinetic energy gains and the momentum distribution peaks, but the other species have higher nonthermal energy fractions because both species show similar maximum energies.
Źródło:
Nukleonika; 2023, 68, 1; 25--28
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Materiał magnetyczny w części nierozpuszczalnej soli wysadu Góra (otwór G-40) – najnowsze wyniki i ich odniesienie do wcześniejszych prac
Magnetic particles in the insoluble material from Góra Salt Dome (G-40) – the latest results and their reference to previous works
Autorzy:
Jaworska, Joanna
Borowczyk, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/2192071.pdf
Data publikacji:
2018
Wydawca:
Polskie Stowarzyszenie Górnictwa Solnego
Tematy:
sole cechsztyńskie
rezyduum
składnik magnetyczny
antropogeniczny czy pozaziemski materiał
Zechstein salt
residuum
magnetic particles
anthropogenic or extraterrestrial material
Opis:
W celu zbadania pochodzenia materiału magnetycznego w próbkach soli cechsztyńskich przeanalizowano dostępny, siedmiometrowy fragment rdzenia G-40, z głębokości 510- 528 m p.p.t., pozyskanego z wysadu Góra (ryc. 1). Szczególną uwagę poświęcono wykluczeniu możliwości udziału materiału pochodzenia antropogenicznego wśród materii magnetycznej stanowiącej składniki rezyduum z rozpuszczenia soli. Łącznie rozpuszczono 96,874 kg soli cechsztyńskiej uzyskując po osuszeniu 1069,8 g suchej pozostałości. Średnia zawartość rezyduum dla przebadanych fragmentów rdzenia wyniosła 1,12%. Wśród materiału magnetycznego zebrano jedynie nieregularne, blaszkowate ziarna o rozmiarach od 150 do ok. 400 μm (ryc. 2). Przebadane ziarna magnetyczne zawierają 52,7-84,2 % tlenku żelaza Fe2O3, ok. 0,3-3,04% tlenku glinu, a także krzemionkę, sód, wapń lub mangan. W 2 próbkach odnotowano obecność cynku oraz w pojedynczych molibdenu, wolframu, a także fosforu. Ponieważ każdy etap pracy przygotowawczej, a także późniejszej, laboratoryjnej odbywał się ze szczególną dbałością o zachowanie sterylności próbek, należy wykluczyć możliwość udziału – przedostania się do analizowanego materiału składników pochodzenia antropogenicznego. Zatem pochodzenie kosmiczne materiału magnetycznego o kształtach nieregularnych jest bardzo prawdopodobne. W badanym materiale nie stwierdzono obecności żadnej formy kulistej – sferuli. Tym samym obecność form kulistych – sferulek w większych ilościach (zob. praca L. Mazura 1973, tab. 1), może budzić wątpliwości.
Near 97 kg of salt samples from borehole G-40 from Góra Salt Dome (fig. 1) was obtained and dissolved. There was analysed insoluble material, which was characterized by high magnetisation. All analyzed salt samples come from 2-nd Zechstein (Late Permian) cyclothem Stassfurt, from deep 510-528 m b.g.l. The collected material (15 grains) are representing only one type form - irregular particles, plates form of size 150 to over 400 μm (see fig. 2). There was not noted any regular, spherical form – spherules. This material was analysed using the SEM - EDS. The chemical composition of particles ranges from 52,7 to 84,2 % iron oxide and 0,3-3,04 % aluminium oxide. In none of the samples was noted Ni. Irregular particles have rough surface and sharp edges. The origin of this material can be extraterrestrial. Highly probably that this particles are cosmic dust, micrometeorites or small shattered fragments of bigger meteorite body. The possibility of participation of anthropogenic material as accidental contamination of analyzed samples has been rather excluded.
Źródło:
Przegląd Solny; 2018, 14; 70--76
2300-9349
Pojawia się w:
Przegląd Solny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Models of viscosity characteristics η=η(b) of ferro-oil with different concentration of magnetic particles in the presence of external magnetic field
Autorzy:
Frycz, M.
Czaban, A.
Powiązania:
https://bibliotekanauki.pl/articles/244776.pdf
Data publikacji:
2014
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
ferro-oil
dynamic viscosity
magnetic particles concentration
external magnetic field
Opis:
The purpose of this article is to determine, identify and describe the viscosity characteristics of the ferro-oil with different concentrations of magnetic particles in the presence of an external magnetic field interaction. These characteristics are defined in the context of magnetic induction changes. These rheological tests were performed on a Physica MCR 301 rheometer. It was used a measuring system ‘plate to plate’ type which was armed with magneto-rheological research system MRD 180/1T. The tests were performed for the selected temperature of the medium i.e. 90°C, the shear rate θ changes were carried from 0 to 1000 1/s. Changes of the magnetic field intensity value were ranged from 0 to 500 mT. The selected concentrations of magnetic particles in a ferro-oil were 1%, 2%, 4%, 6% and 8% and the tested ferro-oil was product of FerroTec of Unterensingen (Germany), which is a mixture of colloidal mineral motor oil Penzzoil’s LongLife Gold's SAE 15W-40 with Fe3O4 magnetic particles and the surfactant. Analyses of the results, identify and matching characteristic were calculated using STATISTICA software. It has been proposed three categories of functions mapping the waveforms of the results obtained experimentally: the exponential function, logarithmic with basis of the normal and the polynomial function.
Źródło:
Journal of KONES; 2014, 21, 4; 119-126
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 30

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