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Wyświetlanie 1-15 z 772
Tytuł:
Парламент или Советы: российский выбор 1918 года
Parliament or councils? The Russian choice in 1918
Autorzy:
Исаев, Игорь А.
Powiązania:
https://bibliotekanauki.pl/articles/697550.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Opolski
Tematy:
parliament
councils
democracy
dictatorship
representation
legitymacy
legalism
separation of powers
law
rule
state power
authority
Opis:
The article deals with one of the most important issues in the Soviet political and legal history. The choice of the political form that was established almost immediately after the victory of the Bolsheviks in the Revolution of 1917, meant a change in the direction of development of the state. Councils became an alternative to the parliamentary republic. The article analyzes the basic principles of both political systems and the reasons for such a choice. The author emphasizes transnational political direction of the so-called “direct action” which took place not only in Russia, but also in several European countries.
Źródło:
Opolskie Studia Administracyjno-Prawne; 2016, 14, 3; 93-99
2658-1922
Pojawia się w:
Opolskie Studia Administracyjno-Prawne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental validation of mathematical model describing external stores separation
Eksperymentalna walidacja matematycznego modelu opisującego proces odejścia podwieszenia z nosiciela
Autorzy:
Żyluk, A.
Powiązania:
https://bibliotekanauki.pl/articles/279308.pdf
Data publikacji:
2005
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
external stores separation
aerodynamics interference
dynamics of aerial munitions
Opis:
This work is concerned with concepts and some results regardine the problem of aerodynamic interference in the system. The main emphasis is put on a practical, cost-effective engineering solution to this complex problem with reasonable computational efficiency allowing a code to run on PC computers. Prediction of separation trajectories of external stores is an important task in the aerodynamic design area having the objective to define operational release envelopes. To attain this purpose, a technique based on the Non-linear Panel Method with an unsteady free wake formulation has been developed. The comparison with a flight test as well as wind tunnel investigations has proved the reliability of this methodology.
W pracy przedstawiono ogólny model badań własności dynamicznych bomb lotniczych. Główny nacisk położono na praktyczne rozwiązanie złożonego problemu oddzielenia podwieszeń od nosiciela z uwzględnieniem interferencji aerodynamicznej. Opracowane algorytmy i programy komputerowe pozwalają na rozwiązanie tego zagadnienia na komputerach klasy PC. Model matematyczny zweryfikowano badaniami w tunelach aerodynamicznych i badaniami doświadczalnymi w locie.
Źródło:
Journal of Theoretical and Applied Mechanics; 2005, 43, 4; 855-873
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Regional Global Climate Changes due to Human Influences
Autorzy:
Zurbenko, Igor G.
Potrzeba-Macrina, Amy L.
Powiązania:
https://bibliotekanauki.pl/articles/1065361.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Kolmogorov-Zurbenko time and space filtration
separation of scales
total solar irradiation
Opis:
In recent years global climate change has been the focus of much scientific research as well as a focal point in the media. A recent period of significant increases in global temperatures has caused much concern. This period was followed by a relative slowdown, which in turn has created confusion. There are two major reasons for global temperatures variations, one of which is oscillations of total solar activity in time. Another reason is atmospheric pollutants causing greenhouse effects. Obviously, solar activities cannot be controlled, but relevant pollutants can. Since these two reasons are independent components of global temperature variations, they must be separated in order to adequately study global climate changes. Solar irradiation transferred to Earth is proportional to sunspot numbers, which have been recorded for centuries. The purpose of this paper is to separate this solar component from long-term temperature data, thus leaving for examination the component created by human activities. This separation of components and examination thereof can be performed at numerous locations over Earth, that is, the time component and rates of its increases can be mapped over the globe. This paper smooths these images to display the different rates of temperature increases over different global regions, which allows for a comparison of different regional efforts to fight climate changes. In some regions, negative rates were occurring as of recent years, but other regions those rates are becoming alarmingly high. The average rate of temperature increase due to human influence over the planet is remaining positive. The regional comparisons offer a great opportunity for assessing different methods of control of global climate changes.
Źródło:
World Scientific News; 2019, 132; 1-15
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Solar Energy Supply Fluctuations to Earth and Climate Effects
Autorzy:
Zurbenko, Igor G.
Potrzeba-Macrina, Amy L.
Powiązania:
https://bibliotekanauki.pl/articles/1065091.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Kolmogorov-Zurbenko filter
regional climate change
separation of scales
spectral analysis
sunspots numbers
total solar irradiation
Opis:
A major source of energy on Earth is solar irradiation. This paper uses the Kolmogorov-Zurbenko filter to smooth and examine sunspot numbers and proves that solar irradiation levels near Earth are strictly proportional to sunspot numbers. This paper also examines the transport of that energy through the atmosphere to Earth’s surface. Long term air temperatures on the surface of Earth perfectly follow the cosine square law along latitudes. Time components of long term temperatures have oscillations which follow oscillations in sunspot numbers, but due to the regular delays in energy transmission they are delayed 4-7 years. Cloud formations and vapor accumulations also contribute to those delays, which have a well-organized time-space structure. The main purpose of this paper is the numerical identification of human influence over changes in solar activities, which may allow researchers to identify the effects of various sources of those influences. This evaluation can only be achieved by separating the scales in order to avoid any false influence from other scales. The clear separation of scales can only be achieved using the Kolmogorov-Zurbenko filter.
Źródło:
World Scientific News; 2019, 120, 2; 111-131
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On Personal Security Issues of Soldiers from Polish Military Contingent in Iraq
Autorzy:
Żukowska, Irena
Powiązania:
https://bibliotekanauki.pl/articles/1861594.pdf
Data publikacji:
2016
Wydawca:
Wyższa Szkoła Bezpieczeństwa Publicznego i Indywidualnego Apeiron w Krakowie
Tematy:
military family
mission
separation
Iraq
Opis:
Going on a mission undoubtedly constitutes a real threat to the stability of a military family. The fact of being temporarily separated, together with all the related emotional problems, seem to cause a number of dysfunctions in the partners’ relations. The departure of the spouse for a mission is an important social phenomenon which creates a new situation in which the widely acknowledged patterns of family behavior do not guarantee the fulfillment of the family’s needs. Hence, there is a necessity to renegotiate family roles and their scope. In the families of soldiers who go on a mission it is the wife who takes over all the duties and the responsibility for the family’s general wellbeing. They have to face the dull reality: paying the bills, making renovations and bringing up children. When back home, the soldiers take over the man’s responsibilities. From one moment to the next, they have to became fathers, husbands and the heads of their families again. Unfortunately, it is difficult for both spouses to cope with such a situation.
Źródło:
Security Dimensions; 2016, 17(17); 42-54
2353-7000
Pojawia się w:
Security Dimensions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Natural antioxidants in seeds of winter rapeseed (Brassica napus L.)
Naturalne antyoksydanty w oleju z nasion rzepaku ozimego
Autorzy:
Zukalova, H.
Vasak, J.
Powiązania:
https://bibliotekanauki.pl/articles/832880.pdf
Data publikacji:
1998
Wydawca:
Instytut Hodowli i Aklimatyzacji Roślin
Tematy:
natural antioxidant
antioxidant
seed
winter rapeseed
rapeseed
Brassica napus
tocopherol
phenolic compound
separation
high performance liquid chromatography
Źródło:
Rośliny Oleiste - Oilseed Crops; 1998, 19, 1
1233-8273
Pojawia się w:
Rośliny Oleiste - Oilseed Crops
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelowanie procesu separacji elektrostatycznej wybranych mieszanin polimerowych
Modeling of electrostatic separation process for some polymer mixtures
Autorzy:
Żuk, T.
Pietraszak, J.
Żenkiewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/947279.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
Tematy:
separacja elektrostatyczna
tworzywa biodegradowalne
planowanie doświadczeń
PLA
PCL
PVC
PET
electrostatic separation
biodegradable polymers
design of experiments
Opis:
Przedstawiono wyniki badań procesu separacji elektrostatycznej mieszanin polilaktydu (PLA) zpoli(ε-kaprolaktonem) (PCL), PLA zpoli(chlorkiem winylu) (PVC) iPLA zpoli(tereftalanem etylenu) (PET). Oceniono cztery wielkości wejściowe procesu, mające podstawowy wpływ na efekty separacji elektrostatycznej badanych mieszanin: udział masowy poszczególnych składników mieszaniny, czas elektryzowania fluidyzacyjnego, różnicę potencjałów między elektrodami oraz prędkość obrotową elektrody walcowej. Opracowano, anastępnie przeanalizowano modele matematyczne procesu separacji elektrostatycznej badanych mieszanin. Stwierdzono, że otrzymane modele matematyczne separacji elektrostatycznej mieszanin PLA, PCL, PVC iPET można wykorzystać praktycznie do analizy efektywności rozdziału tych mieszanin.
The results of investigations of electrostatic separation of mixtures of polylactide (PLA) with poly(ε-caprolactone) (PCL) and PLA with poly(vinyl chloride) (PVC) or poly(ethylene terephthalate) (PET) are presented. Four input quantities of the process, having abasic influence on the effects of electrostatic separation of the investigated mixtures, were examined: (a) mass fraction of the individual components, (b) fluidized-bed charging time, (c) potential difference between the electrodes, (d) rotational speed of the roll electrode. The mathematical models of electrostatic separation process of PLA, PCL, PVC and PET mixtures were developed and analyzed. It was found that these models can be used in practice for analysis of separation of these mixtures.
Źródło:
Polimery; 2016, 61, 7-8; 519-527
0032-2725
Pojawia się w:
Polimery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Concept of separation method between aircraft in the transition period
Autorzy:
Żuchowska, Daria
Stelmach, Anna
Powiązania:
https://bibliotekanauki.pl/articles/38955842.pdf
Data publikacji:
2022
Wydawca:
Politechnika Warszawska, Wydział Transportu
Tematy:
Airborne Separation Assurance System
distributed air traffic control
new concepts of air traffic control
multi-agent systems
ruch lotniczy
sterowanie ruchem lotniczym
kontrola ruchu lotniczego
system wieloagentowy
Opis:
The current concept of air traffic control based on human work was created many years ago and is now approaching the limit of its performance. Therefore, new concepts for air traffic control are being sought. One of the ideas is to delegate the responsibility for ensuring separation between aircraft to aircraft crews. The issue of self-separation is quite a difficult task. Analysis of the literature concludes that the transition from one phase to another will occur in stages. This paper focuses on the transition period. The concept of a method of ensuring separation when changing traffic organization was proposed. A vital element of the separation method in the transition period is to define the negotiation and communication process between aircraft, which was presented in this paper.
Źródło:
WUT Journal of Transportation Engineering; 2022, 135; 5-16
1230-9265
Pojawia się w:
WUT Journal of Transportation Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prediction of quality parameters of a dry air separation product using machine learning methods
Przewidywanie parametrów jakościowych produktu suchej separacji węgla metodami uczenia maszynowego
Autorzy:
Żogała, Alina
Rzychoń, Maciej
Powiązania:
https://bibliotekanauki.pl/articles/216889.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN
Tematy:
artificial neural network
multiple linear regression
support vector machine
dry coal separation
sztuczna sieć neuronowa
sucha separacja węgla
wielokrotna regresja liniowa
maszyna wektorów nośnych
Opis:
The purpose of the work was to predict the selected product parameters of the dry separation process using a pneumatic sorter. From the perspective of application of coal for energy purposes, determination of process parameters of the output as: ash content, moisture content, sulfur content, calorific value is essential. Prediction was carried out using chosen machine learning algorithms that proved to be effective in forecasting output of various technological processes in which the relationships between process parameters are non-linear. The source of data used in the work were experiments of dry separation of coal samples. Multiple linear regression was used as the baseline predictive technique. The results showed that in the case of predicting moisture and sulfur content this technique was sufficient. The more complex machine learning algorithms like support vector machine (SVM) and multilayer perceptron neural network (MPL) were used and analyzed in the case of ash content and calorific value. In addition, k-means clustering technique was applied. The role of cluster analysis was to obtain additional information about coal samples used as feed material. The combination of techniques such as multilayer perceptron neural network (MPL) or support vector machine (SVM) with k-means allowed for the development of a hybrid algorithm. This approach has significantly increased the effectiveness of the predictive models and proved to be a useful tool in the modeling of the coal enrichment process.
Celem pracy było prognozowanie wybranych parametrów produktu procesu suchej separacji za pomocą sortera pneumatycznego. Z punktu widzenia zastosowania węgla do celów energetycznych niezbędne jest określenie parametrów procesowych wydobycia, takich jak: zawartość popiołu, zawartość wilgoci, zawartość siarki czy wartość kaloryczna. Prognozowanie przeprowadzono przy użyciu wybranych algorytmów uczenia maszynowego, które okazały się skuteczne w prognozowaniu wyjścia różnych procesów technologicznych, w których zależności między parametrami procesu są nieliniowe. Źródłem danych wykorzystanych w pracy były eksperymenty procesu suchej separacji węgla. Zastosowano wieloraką regresję liniową jako bazową metodę predykcyjną. Wyniki pokazały, że w przypadku przewidywania zawartości wilgoci i siarki technika ta była wystarczająca. Bardziej złożone algorytmy uczenia maszynowego, takie jak maszyna wektorów nośnych (SVM) i perceptron wielowarstwowy (MLP) zostały wykorzystane i przeanalizowane w przypadku zawartości popiołu i wartości opałowej. Ponadto wdrożono technikę k-średnich. Rolą analizy skupień było uzyskanie dodatkowych informacji na temat próbek węgla będących wejściem procesu. Połączenie technik, takich jak perceptron wielowarstwowy (MLP) lub maszyna wektorów nośnych (SVM) z metodą k-średnich pozwoliło na opracowanie hybrydowego algorytmu. Takie podejście znacznie zwiększyło efektywność modeli predykcyjnych i okazało się użytecznym narzędziem w modelowaniu procesu wzbogacania węgla.
Źródło:
Gospodarka Surowcami Mineralnymi; 2019, 35, 2; 119-138
0860-0953
Pojawia się w:
Gospodarka Surowcami Mineralnymi
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Przedstawicielstwo dyplomatyczne Stanów Zjednoczonych Ameryki przy Watykanie a Pierwsza Poprawka do Konstytucji USA (aspekty historyczne i prawne)
U.S. Diplomatic Representation at the Vatican and the Constitution’s First Amendment (Historical and Legal Aspects)
Autorzy:
Zieliński, Tadeusz J.
Powiązania:
https://bibliotekanauki.pl/articles/494522.pdf
Data publikacji:
2014
Wydawca:
Wydawnictwo Naukowe Chrześcijańskiej Akademii Teologicznej w Warszawie
Tematy:
Dyplomacja USA
Watykan
Stolica Apostolska
rozdział kościoła I państwa
Pierwsza Poprawka do Konstytucji USA
U.S. Diplomacy
The Vatican
The Holy See
Separation of Church and State
First Amendment to the U.S. Constitution
Opis:
The paper presents an issue of diplomatic relations of the United States with Papacy since the early years of American Republic. It sketches development of consular representation of the late 18th century which eventually turned into regular contacts at the ambassadorial level during the Presidency of Ronald Reagan three decades ago. This historical analysis is accompanied by legal remarks highlighting constitutional matters evoked by the First Amendment, which stipulates the principle of separation of church and state.
Artykuł podejmuje zagadnienie stosunków dyplomatycznych Stanów Zjednoczonych z Papiestwem od czasu utworzenia amerykańskiej Republiki. Przynosi zarys rozwoju stosunków konsularnych obu podmiotów począwszy od schyłku XIX wieku, które ostatecznie około trzydzieści lat temu przyjęły w okresie prezydentury Ronalda Reagana kształt stałych relacji na poziomie ambasadorów. Tej analizie historycznej towarzyszą rozważania natury prawnej skupione na problematyce konstytucyjnej związanej z normą Pierwszej Poprawki, która określa zasadę rozdziału kościoła i państwa w USA.
Źródło:
Rocznik Teologiczny; 2014, 56, 1; 155-180
0239-2550
Pojawia się w:
Rocznik Teologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Deashing and desulphurization of fine oxidized coal by falcon concentrator and flotation
Autorzy:
Zhu, X.
Tao, Y.
Sun, Q.
Man, Z.
Xian, Y.
Powiązania:
https://bibliotekanauki.pl/articles/951856.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
fine oxidized coal
desulphurization
deashing
flotation
enhanced gravity separation
Opis:
Flotation and enhanced gravity separation based on different separation principles were carried out to investigate the desulphurization and deashing efficiency of fine oxidized coal. Surface properties of fresh and oxidized coals were tested by XPS and results showed that the contents of hydrophobic functional groups decreased while the content of hydrophilic functional groups increased after oxidization. Floatability and density analysis results showed that the floatability of coal samples decreased sharply because of oxidation, however, density composition of coal sample only had slight changes. Separation results showed that yields of gravity concentrates outclassed that of flotation concentrates, meanwhile, ash contents and sulfur contents of gravity concentrates were far lower than that of flotation concentrates. Yields and ash contents increased with the collector dosage and achieved to be 17.83 and 26.94% respectively when the collector dosage was 1600 g•Mg-1. Yields and ash contents of gravity concentrates decreased with the centrifugal force and increased with the recoil water flow with similar sulfur content. Clean coal with yield of 53.86%, ash content of 9.81%, sulfur content of 1.47% and with a corresponding desulphurization efficiency of 44.53% was achieved at centrifugal force of 107 g and recoil water flow of 13.3 dm3•min-1. For fine oxidized coal, enhanced gravity separation has a significant advantage of the separation efficiency compared with flotation.
Źródło:
Physicochemical Problems of Mineral Processing; 2016, 52, 2; 634-646
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A preliminary investigation of dry gravity separation with low specific gravity ores using a laboratory Knelson Concentrator
Autorzy:
Zhou, Meng
Kökkılıç, Ozan
Langlois, Raymond
Waters, Kristian E.
Powiązania:
https://bibliotekanauki.pl/articles/24085570.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
Knelson concentrator
dry gravity separation
response surface method
Box-Behnken design
Opis:
It has become an active research area for treating low specific gravity (SG) deposits by centrifugal separation due to its high efficiency, low cost and minor environmental impact. Laboratory Knelson Concentrator has shown its potential for processing high density ores on a dry basis. This study investigated the feasibility and the optimum operating conditions when processing a dry low SG feed with a modified Knelson Concentrator. A synthetic mixture of magnetite and quartz with a grade of 1% magnetite was used to mimic a low-density ratio ore. Bowl speed (G), air fluidizing pressure (psi) and solids feed rate (g/min) were chosen as the operating variables. Box-Behnken design was used to design the experiments and response surface method was used for optimization. The effects of each individual factors and their interactions on concentrate grade and magnetite recovery were evaluated. The dry process achieved up to 60 % magnetite recovery with an upgrade ratio of 5. The optimized values for the concentration with the highest recovery and grade of bowl speed, solids feed rate and air fluidizing pressure are 27 G, 200 g/min and 12 psi, respectively.
Źródło:
Physicochemical Problems of Mineral Processing; 2023, 59, 5; art. no. 165992
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effective flotation separation of scheelite and calcite by applying methylene phosphonic acid sodium as a novel and green depressant
Autorzy:
Zhou, Hepeng
Wu, Handan
Guo, Jiangfeng
Tang, Xuekun
Huang, Wen
Luo, Xianping
Powiązania:
https://bibliotekanauki.pl/articles/24086193.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
scheelite
calcite
inhibition mechanism
flotation separation
Opis:
It is known that the flotation separation of scheelite and calcite is quite difficult due to their similar surface properites. To slove the problem, ethylenediaminetetra (methylene phosphonic acid) sodium (EDTMPS), an environmentally friendly reagent, was employed as an efficient depressant for flotation separation of calcite for the first time. In flotation experiments, it demonstrates that EDTMPS could strongly inhibit the flotation of calcite but barely affect the flotaiton behavior of scheelite, showing excellent dpress ability and selectivity. Based on a series of measurements including contact angle analysis, zeta potential, and XPS analysis, it was found that large amout of EDTMPS could be absorbed on the surface of calcite through strong chemical chelation reaction and thus inhibiting the further adsorption of NaOL. On the contrary, little EDTMPS was absorbed on that of scheelite owing to the negatively charged tungstate ions on the surface in relative terms. All in all, these results exhibit EDTMPS has excellent selective inhibition ability on calcite, which can be potentially applied in actual scheelite and calcite flotation separation process.
Źródło:
Physicochemical Problems of Mineral Processing; 2023, 59, 3; art. no. 168517
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fast and unique Tucker decompositions via multiway blind source separation
Autorzy:
Zhou, G.
Cichocki, A.
Powiązania:
https://bibliotekanauki.pl/articles/201572.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Multiway Blind Source Separation (MBSS)
Multilinear Independent Component Analysis (MICA)
Constrained tensor decompositions
Tucker models
Nonnegative Tucker Decomposition (NTD)
Opis:
A multiway blind source separation (MBSS) method is developed to decompose large-scale tensor (multiway array) data. Benefitting from all kinds of well-established constrained low-rank matrix factorization methods, MBSS is quite flexible and able to extract unique and interpretable components with physical meaning. The multilinear structure of Tucker and the essential uniqueness of BSS methods allow MBSS to estimate each component matrix separately from an unfolding matrix in each mode. Consequently, alternating least squares (ALS) iterations, which are considered as the workhorse for tensor decompositions, can be avoided and various robust and efficient dimensionality reduction methods can be easily incorporated to pre-process the data, which makes MBSS extremely fast, especially for large-scale problems. Identification and uniqueness conditions are also discussed. Two practical issues dimensionality reduction and estimation of number of components are also addressed based on sparse and random fibers sampling. Extensive simulations confirmed the validity, flexibility, and high efficiency of the proposed method. We also demonstrated by simulations that the MBSS approach can successfully extract desired components while most existing algorithms may fail for ill-conditioned and large-scale problems.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2012, 60, 3; 389-405
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on buildup of fine weakly magnetic minerals on matrices in high gradient magnetic separation
Autorzy:
Zheng, X.
Wang, Y.
Lu, D.
Powiązania:
https://bibliotekanauki.pl/articles/109662.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
particle buildup
force equilibrium
magnetic matrices
magnetic separation
Opis:
Buildup of magnetic mineral particles on matrices determines the saturated deposit volume of minerals, which is of great importance in the high gradient magnetic separation (HGMS) systems. In this paper buildup of fine weakly magnetic minerals on the matrix is studied with a force equilibrium model. Elaborate rules of particle buildup on the matrix are presented. An imaginary sector ring is used to approximately quantify the volume of saturated particle buildup. The influence of the particle size, magnetic induction, fluid viscosity and velocity as well as matrix size on saturated particle buildup is investigated and discussed. With the same matrix size, the saturated buildup volume decreases with the decrease of the particle size, applied magnetic induction and increase of the fluid viscosity and velocity. The saturated buildup volume normalized by the matrix volume, and the ratio of particle deposit volume to the matrix volume (Vd/Vm) decreases with the increase of the matrix size. Under the same matrices packing fraction, the total mineral deposit volume, when adopting small size matrices, is larger than that when adopting large size matrices. Only small size matrices can be used for recovery of minerals in size of several micrometers. Based on performed analyses, the ore feeding time in a cycle for a cyclic HGMS system and the rotation speed of the swivel for a continuous HGMS system under different circumstances are also discussed.
Źródło:
Physicochemical Problems of Mineral Processing; 2017, 53, 1; 94-109
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 772

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