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Wyświetlanie 1-15 z 107
Tytuł:
Analytical forms of deuteron wave function and density distribution
Autorzy:
Zhaba, V. I.
Powiązania:
https://bibliotekanauki.pl/articles/1177883.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
analytic form
approximation
density distribution
deuteron
transition density
wave function
Opis:
Values of density distribution and transition density are calculated using the obtained coefficients of four deuteron wave function for analytical forms in coordinate representation for Argonne v18 potential. Calculations of these values can serve for an assessment of a correctness and accuracy of choice of an analytical form at concrete approximation of radial deuteron wave function. Also these calculations help to evaluate information on such characteristics of a deuteron as a charge form factor, tensor polarization and momentum distribution.
Źródło:
World Scientific News; 2018, 98; 206-213
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Role of initial density distribution in simulations of bone remodeling around dental implants
Autorzy:
Nutu, E.
Powiązania:
https://bibliotekanauki.pl/articles/307275.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
energia odkształcenia
kość
warunki początkowe
przebudowa kości
strain energy density
bone quantity
initial conditions
bone remodeling simulation
Opis:
In this paper, the effect of initial density distribution upon the predicted density via numerical simulations of bone remodeling was evaluated. The main purpose was to correlate the numerical results with clinical data according to which the initial bone quantity is an essential factor for long term survival of dental implants. Methods: Two-strain energy density-based bone remodeling theories were employed, one which accounts for overload resorption and the second one, which does not. The remodeling parameters were derived from the mechanostat theory. Bone remodeling around an osseointegrated dental implant was simulated based on finite element method using a generic mandible plane model. A variable time step was introduced to increase the speed of the remodeling simulations by keeping the truncation errors small. The simulations were performed for several initial density distributions correlated with values from clinical classifications of bone quality. For each density value, the occlusal load was defined in two ways so that to consider normal and overload mastication forces, respectively. Results: The results showed that the initial density distribution influences the predictions of bone remodeling simulations. For the analyzed model, the remodeling algorithm predicted overload resorption only in the case of low initial density, which can be associated with low bone quality, which, from clinical perspective, may probably lead to implant loss. Conclusions: The paper demonstrated that when simulating bone remodeling around dental implants using finite element method, it is important to account for initial density distribution in correlation with the bone quantity.
Źródło:
Acta of Bioengineering and Biomechanics; 2018, 20, 4; 23-31
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Modified Penetration Model for Copper-Tungsten Shaped Charge Jets with Non-uniform Density Distribution
Autorzy:
Elshenawy, T.
Elbeih, A.
Li, Q. M.
Powiązania:
https://bibliotekanauki.pl/articles/358894.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
shaped charge
jet penetration
virtual origin
non-uniform density distribution
Opis:
The penetration of a shaped charge jet with non-uniform density distribution was studied. The virtual origin model, which assumes a constant jet density, was modified to include the situation where the jet density deficit/reduction of an un-sintered copper-tungsten powder jet causes a non-uniform jet density distribution. A relation between the relative density ratio and the normalised jet velocity is proposed, based on which an analytical solution of the modified virtual origin model is obtained. The validity of the modified virtual origin model was demonstrated by its largely improved prediction in comparison with experimental and numerical results. It showed that the density reduction term reduces the penetration depth by 16.58% for an un-sintered copper-tungsten powder jet.
Źródło:
Central European Journal of Energetic Materials; 2016, 13, 4; 927-943
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Coronal Electron Density Distribution Estimated from Meter Type II Radio Bursts and Coronal Mass Ejections
Autorzy:
Yusof, N. S.
Hamidi, Z. S.
Norsham, N. A.
Jafni, A. I.
Kahlid, N. M.
Hamdan, M. N.
Kamaruddin, Farahana
Tahar, Muhammad Redzuan
Monstein, C.
Shariff, N. N. M.
Powiązania:
https://bibliotekanauki.pl/articles/1192681.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
coronal mass ejection
Type II radio burst
electron density distribution
e-CALLISTO
Opis:
In this paper, we investigate the characteristic coronal mass ejection and Type II radio burst, we calculated the drift rate of Type II Radio burst and determined the electron density distribution from a Coronal Mass Ejections. The data were taken from website e-CALLISTO, Space Weather, SolarHam and also from the Langkawi National Observatory, National Space Agency, Langkawi Kedah, Malaysia. All the data collected on 15th March 2015, 4th November 2015 and 16th December 2015. On 16 March 2015, the events were associated with slower C9 solar flare and CME. For this week, the events were causing radio blackouts on Earth. On 4 November 2015, the events were associated with M1.9 solar flare, CME and Solar burst Type II. The value of the solar wind was 570.4 km/Sec and value for radio sun was 124 sfu. For drift rate, we calculated the value for sites in Sri Lanka (ACCIMT-SRI), Ooty, India (OOTY), Indonesia (INDONESIA) and Kasi, South Korea (KASI) at between 0324 to 0328 UTC. In South Korea was highest drift rate, which is 1.397 MHz/s. Also, at HB9SCT, Switzerland (HB9SCT), Humain, Belgium (Humain), Daro, Germany (Daro-VHF) and TCD in Birr, Ireland (BIR), we calculated the drift rate of solar burst Type II between 1200 until 1203 UTC. In Belgium had the highest value of the drift rate to compare at other sites. Harmonic pattern was also appeared for all these sites. On 16th December 2015, this event associated with C6.6 solar flare and CME. These events give an impact on the earth geomagnetic field which is formed of aurora because of the combination of both events that trigger geomagnetic storming.
Źródło:
World Scientific News; 2016, 46; 19-35
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Density Distribution and Resin Migration Investigations in Samples of Sand Core Made by Blowing Method
Autorzy:
Dańko, R.
Jamrozowicz, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/106993.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
core shooting
core blowing
molding sand
resin migration
Opis:
Resin migration in a core can occur during the core production process performed by blowing methods in which the core sand is transported into the core box as a two-phase sand-air flux characterized by various working parameters (working pressure, shooting time, volumetric concentration). This migration is the result of the resin being blown off from the matrix grain surfaces by compressed air. The methodology of the investigation of this effect developed at AGH University of Science and Technology is presented in this paper. The results of the resin migration tests obtained for cores made with cold-box technology at various working parameters of the shooting process are also shown.
Źródło:
Journal of Casting & Materials Engineering; 2017, 1, 3; 70-73
2543-9901
Pojawia się w:
Journal of Casting & Materials Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A method for the determination of spatial electron density distribution in great Plasma-Focus devices
Autorzy:
Kasperczuk, A.
Paduch, M.
Pisarczyk, T.
Tomaszewski, K.
Powiązania:
https://bibliotekanauki.pl/articles/147148.pdf
Data publikacji:
2002
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
bremsstrahlung radiation
electron density distribution
frame optical camera
plasma-focus device
plasma radiation intensity
shadowgraphy
Opis:
Determination of the electron density of plasma generated in a great plasma-focus device by means of interferometry is very difficult or sometimes impossible. In order to determine spatial electron density distributions of plasma in a PF-1000 device, a special method was prepared, with the use of plasma images obtained by means of both an optical frame camera and shadowgraphy. Analysis of plasma radiation in the very narrow Äë = 60 Ĺ optical range allowed us to determine the relation between intensity of the plasma radiation and the electron density. It was also shown that the influence of electron temperature on plasma radiation is not large. The presented method allowed us to obtain spatial electron density distributions of plasma (in relative units) in the PF-1000 device. By means of this method a number of important information about the plasma-focus phenomenon was obtained.
Źródło:
Nukleonika; 2002, 47, 1; 23-26
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characteristics and inter-annual changes in temperature, salinity and density distribution in the Gulf of Riga
Autorzy:
Skudra, M.
Lips, U.
Powiązania:
https://bibliotekanauki.pl/articles/48540.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
Riga Gulf
interannual variability
long-term change
temperature
salinity
density
Baltic Sea
vertical stratification
internal Rossby radius
Opis:
Available CTD profiles from the Gulf of Riga (May—August, 1993—2012) were analyzed to study inter-annual and long-term changes in temperature, salinity and density in relation to river runoff and atmospheric forcing (e.g. Baltic Sea Index). To describe temporal changes in vertical stratification, the upper mixed layer (UML) and deep layer (DL) parameters were estimated. On average the UML depth increases from 8.7 m in May to 9.0, 11.5 and 13.7 m in June, July and August, respectively, and the UML temperature increases from 8.08C to 12.5, 18.7 and 18.68C (May, June, July and August) while the UML salinity increases from 4.90 g kg1 to 5.14, 5.28 and 5.38 g kg1, respectively. High correlation (r = 0.82) was found between the inter-annual changes in river runoff (spring) and mean salinity in the UML in August as well as between DL mean salinity (r = 0.88) and density (r = 0.84) in the Irbe Strait and DL mean salinity and density in the Gulf of Riga. Inter-annual changes in the UML depth as well as in DL salinity and density had a significant correlation with the changes in Baltic Sea Index. The strongest stratification (August) can be observed in the years with the highest UML temperature and the highest river run-off in spring. We suggest that the predicted increase in water temperature and changes in river run-off due to the climate change would result in faster development of the seasonal thermocline in spring and stronger vertical stratification in summer.
Źródło:
Oceanologia; 2017, 59, 1
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Two types of parameterization of mass density distribution during immune optimization of the 3D structure
Autorzy:
Poteralski, A.
Powiązania:
https://bibliotekanauki.pl/articles/122880.pdf
Data publikacji:
2014
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
immune algorithm
optimization
finite element method
3D structures
interpolation function
smooth procedure
algorytm immunologiczny
optymalizacja
metoda elementów skończonych
struktury 3D
Opis:
The paper is devoted to an application of the immune algorithm and the finite element method for generation of 3D structures using two different types of parameterization and comparing the final results. The shape, topology and material of the structure are generated for optimization criterion like minimum of the mass of the structure. Two different interpolation functions like: multinomial interpolation and interpolation based on the neighbourhood of elements are used. The purpose of these procedures is appropriate selection of mass densities.
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2014, 13, 2; 105-117
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zróżnicowanie strumienia geotermicznego Ziemi w rejonie Tychów (GZW)
Heat flux density distribution in the area of Tychy (USCB)
Autorzy:
Wagner, Jadwiga
Kaczorowski, Z.
Powiązania:
https://bibliotekanauki.pl/articles/203685.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN
Tematy:
energia geotermalna
strumień cieplny
gęstość strumienia cieplnego
geothermal energy
geothermal stream
heat flux density
Opis:
Model pola cieplnego Ziemi wykonano dla obszaru badań arkusza MhP 0969-Tychy, 1:50 000 wraz z obszarami do niego przyległymi. W interwale głębokości od 0 do 1000 m, w odcinkach stumetrowych, wykonano rozkład temperatury oraz rozkład gęstości strumienia ciepła. Wykorzystano dane archiwalne zamieszczone w dokumentacjach otworów (1950–1990) i pomiary temperatury wykonane w studniach specjalnie dla tej pracy (2010). Interpretacja została wykonana na podstawie bazy danych łącznie z 312 otworów (w tym: 223 otwory badawcze i 89 studni) oraz 880 pomiarów temperatur. W obszarze badań zależnie od: zapotrzebowania inwestora, zagospodarowania terenu i infrastruktury podziemnej – ciepło geotermalne Ziemi – wykorzystać można za pomocą różnych typów instalacji geotermalnych.
A geothermal model of underground heat sources has been constructed for the area of MhP 0969-Tychy, at a scale of 1:50 000. This model includes temperatures, and heat flux density distribution in a 0–1000 m range of depth. The project used the archival data of borehole documentations (produced mainly between 1950 and 1990), as well as temperature measurements taken in wells specifically for this work (2010). The interpretation was based on a database of 312 boreholes (including 223 test boreholes and 89 wells) and 880 temperature measurements. In the area of research, depending on the demands of the investor and land and underground infrastructure, the geothermal heat sources could be accessed using a variety of geothermal installations.
Źródło:
Technika Poszukiwań Geologicznych; 2014, R. 53, nr 1, 1; 71-83
0304-520X
Pojawia się w:
Technika Poszukiwań Geologicznych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of friction for density distribution in die compaction of powders
Wpływ tarcia na rozkład gęstości materiałów drobnoziarnistych w procesie formowania
Autorzy:
Borowski, G.
Powiązania:
https://bibliotekanauki.pl/articles/395505.pdf
Data publikacji:
2011
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
symulacja
formowanie
wypraska
gęstość
tarcie
simulation
forming
compact
density
friction
Opis:
The results of simulation of density distribution in die compaction were described in this paper. There were compared two different types of powder compacts formed under two lubrication conditions.Analysis of powders compaction were implemented for Drucker-Prager Cap model into finite element program ABAQUS. This model was calibrated from experimental work by using simple test, such as cylindrical die compaction of the sample of steel powder material. It was shown, that modifying the lubrication conditions between powder and die wall results in opposing relative density distribution trends in the compact. The predictions of the model in terms of relative density distribution show good agreement of used model and matching with experimental results of research work in die compaction.
W publikacji przedstawiono wyniki symulacji komputerowej rozkładu gęstości podczas scalania materiałów drobnoziarnistych w matrycy zamkniętej. Porównano dwa typy wyprasek z drobnoziarnistych frakcji formowane w różnych warunkach tarcia zewnętrznego. Do symulacji metodą elementów skończonych wykorzystano model Drucker-Prager Cap zaimplementowany w programie obliczeniowym ABAQUS. Model ten skalibrowano wykorzystując wyniki badań doświadczalnych uzyskane przy scalaniu w walcowej matrycy zamkniętej próbek materiałów poszlifierskich z obróbki stali. Stwierdzono, że modyfikacja warunków smarowania powierzchni wewnętrznej matrycy oddziałuje na rozkład gęstości materiału w wypraskach. Wyniki analizy numerycznej rozkładu gęstości wykazały dobre dopasowanie zastosowanego modelu oraz dużą zgodność z wynikami wcześniejszych badań doświadczalnych scalania materiałów drobnoziarnistych.
Źródło:
Postępy Nauki i Techniki; 2011, 10; 159-168
2080-4075
Pojawia się w:
Postępy Nauki i Techniki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Crystal Structure Prediction and Charge Density Distribution of Highly Energetic Dimethylnitraminotetrazole: a First Step for the Design of High Energy Density Materials
Autorzy:
Arputharaj, D. S.
Srinivasan, P.
Asthana, S. N.
Pawar, R. B.
Kumaradhas, P.
Powiązania:
https://bibliotekanauki.pl/articles/358205.pdf
Data publikacji:
2012
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
energetic materials
crystal structure prediction
charge density analysis
atoms in molecules
electrostatic potential
Opis:
The crystal structure of dimethylnitraminotetrazole has been predicted, based on systematically searching for densely packed structures within common organic crystal coordination types, followed by lattice energy minimization. The predicted crystal structures almost match the reported crystal structure determined by X-ray diffraction analysis. To understand the effect of the initial molecular geometry on the crystal packing, the crystal structure simulation was carried out for molecules taken from different environments, such as the X-ray structure (crystal field) and also from ab initiocalculations (gas phase). The predicted crystal structures from both environments are very similar to the reported X-ray structure with a maximum deviation of 4.5%. The crystal density predicted from both methods is close to that reported. The bond topological, energetic and electrostatic properties of the isolated molecule from the predicted crystal structure have been determined using Bader's theory of atoms in molecules. The bond topological characterization reveals that the C-N bond is the weakest bond in the molecule. A large electronegative potential is found in the vicinity of the NO2group and the nitrogen-rich region of the tetrazole ring; these are probably the reactive sites of this molecule.
Źródło:
Central European Journal of Energetic Materials; 2012, 9, 3; 201-217
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Założenia probabilistycznego modelu rozkładu gęstości ziaren w warstwach łoża osadzarki
Assumptions of Probabilistic Model of Grains Density Distribution in Jig Bed Layers
Autorzy:
Głowiak, Stanisław
Powiązania:
https://bibliotekanauki.pl/articles/318941.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
wzbogacanie węgla kamiennego
osadzarka
modelowanie osadzania
krzywe rozdziału
rozpraszanie ziaren
hard coal beneficiation
jig
modeling of the jig operation
partition curve
grains dispersion
Opis:
W pracy przedstawiono istotne ograniczenia rozpraszania cząstek w warstwach łoża osadzarki i skutki tych ograniczeń objawiające się w procesie osadzania. Ograniczenia te są wynikiem znacznego rozpraszania cząstek w stosunkowo wąskim zakresie gęstości warstw łoża. Do tej pory są one pomijane lub niewłaściwie przedstawiane w opisach zjawisk zachodzących w procesie osadzania. Przedstawiono założenia modelu łoża osadzarki uwzględniającego poprawnie te ograniczenia. Model ten jest także tak skonstruowany, że nie ogranicza gęstości tworzących się warstw jak i rozkładu mas w poszczególnych warstwach. Możliwe jest jego doświadczalne sprawdzenie w odpowiednio przygotowanych warunkach laboratoryjnych. Dodatkowo model pozwala wyjaśnić niektóre błędy istniejące w teorii wzbogacania grawitacyjnego.
Significant limits of grain disperion in layers of the jig bed and the consequences of these limits are shown in the presented paper. They are the results of large grains dispersion in relatively small range of jig bed density layers. These limits are omitted or incorrectly presented in the descriptions of the phenomena occuring in the jig operation in most of existing papers. Correct conditions and assumptions of probabilistic model of these phenomena are presented. The construction of this probabilistic model does not have any restrictions for proper creation of the density layers of jig bed and amount of mass distributed in these layers. The experimental validation of this model in the laboratory conditions is possible in particular situation. Additionally this model explains some errors existing in gravitional benefication theory.
Źródło:
Inżynieria Mineralna; 2019, 21, 1; 211-220
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Charge Density Distribution, Electrostatic Properties and Sensitivity of the Highly Energetic Molecule 2,4,6-Trinitro-1,3,5-triazine: A Theoretical Study
Autorzy:
Srinivasan, P.
Maheshwari, K.
Jothi, M.
Kumaradhas, P.
Powiązania:
https://bibliotekanauki.pl/articles/358320.pdf
Data publikacji:
2012
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
energetic molecule
electron density
Laplacian of electron density
electrostatic potential
impact sensitivity
Opis:
Ab initio and density functional theory (DFT) calculations were carried out on the energetic propellant molecule 2,4,6-trinitro-1,3,5-triazine (TNTA) to understand its bond topology and its energetic properties using the theory of atoms in molecules (AIM). The DFT method predicts that the electron density ρ bcp (r) at the bond critical points of ring C-N bonds is ∼ 2.34 e Å -3 and the corresponding Laplacian ∇ 2 ρ bcp(r) is ∼ -24.4 e Å -5 ; whereas these values are found to be very small in the -NO2 group attached to C-N bonds [ρ bcp(r): ∼ 1.73 e Å -3 and Δ 2 ρ bcp (r): ∼ -14.5 e Å -5 ]. The negative Laplacian values of C-NO 2 bonds are significantly lower which indicates that the charges of these bonds are highly depleted. The C-NO2 bonds exhibit low bond order (∼ 0.8), as well as low (∼ 56.4 kcal/mol) bond dissociation energy. As we reported in our earlier studies, we found high bond charge depletion for these bonds, which are considered the weakest bonds in the molecule. The frontier orbital energies exhibit a wide band gap, which is larger than those of existing molecules TATB, TNT and TNB. The impact sensitivity (H 50 %) (4.2 m) and oxygen balance (2.77%) were calculated and compared with related structures. Large negative electrostatic potential regions were found near the nitro groups where reaction is expected to occur. The relation between charge depletion ∇ 2 ρ bcp(r) and the electrostatic potential at the bond midpoints V mid reveals the sensitive areas of the molecule.
Źródło:
Central European Journal of Energetic Materials; 2012, 9, 1; 59-76
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Crystal Density Prediction, Charge Density Distribution and the Explosive Properties of the Highly Energetic Molecule 2-Methyl-5-nitramino-tetrazole: a DFT and AIM Study
Autorzy:
Srinivasan, P.
Kumaradhas, P.
Powiązania:
https://bibliotekanauki.pl/articles/358115.pdf
Data publikacji:
2013
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
crystal density
electron density
Laplacian of electron density
impact sensitivity
electrostatic potential
Opis:
The ab initio crystal density, bond topological and explosive properties of the energetic molecule 2-methyl-5-nitraminotetrazole (MNAT) have been calculated by the MOLPAK/PMIN software and the AIM theory. The density predicted from the crystal structure simulation almost matches the experimental density. The geometrical parameters of the molecule lifted from the crystal structure are in very close agreement with the reported X-ray molecular structure. The bond topological analysis predicts a signifcantly low bond electron density, as well as a less Laplacian of electron density, for the N–NO2 bond. The Laplacian for the bond to the attached methyl group, the C(2)–N(2) bond, is also found to be less negative; the less negative values of the Laplacian confrms that these are the weakest bonds in the molecule. The impact sensitivity (h50) of the molecule has been calculated, and is almost equal to the reported experimental value. The sensitivity of the molecule was also estimated from the electrostatic imbalance parameter and has the value ν = 0.242. The isosurface of the electrostatic potential of the molecule displays a high negative electrostatic potential region around the tetrazole ring and the nitramine N–N bond, which are the possible reactive locations in the molecule.
Źródło:
Central European Journal of Energetic Materials; 2013, 10, 1; 53-68
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dry beneficiation and cleaning of chinese high-ash coarse coal utilizing a dense-medium gas-solid fluidized bed separator
Autorzy:
He, J.
Tan, M.
Zhu, R.
Luo, Z.
Powiązania:
https://bibliotekanauki.pl/articles/110808.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
coal cleaning
dense-medium fluidized bed
density distribution
segregation
separation performance
Opis:
Dry dense-medium fluidized bed separation provides a new alternative approach for coal beneficiation and cleaning. An indicator of segregation degree Sash was proposed to evaluate the stratified performance of coal samples by bed density. Fluidization stability of the bed was greatly enhanced by mixing a certain amount (21.53%) of fine magnetite powder (< 0.15 mm) into the fluidized media, which indicated a uniform density distribution as well as slight fluctuations in bed. It was found that the favorable density-segregation performance of 3–13 mm coarse coal occurred with a static bed height of 80 mm and a superficial gas velocity of 11.84 cm/s. The optimal segregation degree values of 0.67, 0.74 and 0.76 were obtained for 3–6, 6–10 and 10–13 mm coal samples, respectively. Low-ash clean coal with yields of 50.79, 56.83 and 61.24% were effectively acquired by the dry separation for various coal size fractions, respectively. Probable error values of 0.07, 0.055 and 0.05 g/cm3 were achieved, indicating good separation performance.
Źródło:
Physicochemical Problems of Mineral Processing; 2016, 52, 2; 662-675
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 107

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