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    Wyświetlanie 1-7 z 7
    Tytuł:
    First principles study of mechanical stability and thermodynamic properties of K₂S under pressure and temperature effect
    Autorzy:
    Boufadi, F.
    Bidai, K.
    Ameri, M.
    Bentouaf, A.
    Bensaid, D.
    Azzaz, Y.
    Ameri, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1070528.pdf
    Data publikacji:
    2016-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    62.20.de
    81.40.Jj
    71.15.Ap
    62.20.dj
    Opis:
    First principles calculations on structural, elastic and thermodynamic properties of K₂S have been made using the full-potential augmented plane-waves plus local orbitals within density functional theory using generalized gradient approximation for exchange correlation potentials. The ground state lattice parameter, bulk moduli have been obtained. The second-order elastic constants, Young and shear modulus, Poisson ratio, have also been calculated. Calculated structural, elastic and other parameters are in good agreement with available data. The elastic constants and thermodynamic quantities under high pressure and temperature are also calculated and discussed.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 3; 315-322
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A scalar-geometric approach for the probable estimation of the reserve of some Pb-Zn deposits in Ameri, southeastern Nigeria
    Autorzy:
    Arinze, Innocent J.
    Emedo, Chidubem O.
    Ugbor, Charles C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1839003.pdf
    Data publikacji:
    2019
    Wydawca:
    Główny Instytut Górnictwa
    Tematy:
    Ameri
    deposit
    profile
    reserves estimation
    resistivity
    vein
    złoże
    profil
    szacowanie zasobów
    rezystywność
    żyła
    Opis:
    The Cretaceous sedimentary sequence of the Asu River Group in Ameri, southeastern Nigeria play host to lead-zinc ore deposits in irregular mineralized veins of non-uniform geometry. Two deposits (designated DEPOSIT A and DEPOSIT B) were economically assessed using an integrated approach. This was performed by employing a geometry-based classical scheme involving the mathematical relationship between the three cardinal variables of ore reserve estimation namely: surface area, thickness and density. Firstly, detailed and extensive geological mapping was carried out to establish the geological attribute of the mineral deposits. Since reserve estimation extends beyond exposed faces, spontaneous potential traverse, vertical electrical sounding and horizontal profiling, being orthogonal to the trend of the enclosing veins were used to characterize the existing sub-surface stratification and create forward models that revealed the concealed ore geometry (limiting depth, lateral extents and thickness variations). Subsequent to delineation, the depth to the top of the target ore lodes was obtained by implementing the Peter's half slope technique on self-potential curves. Thickness values of the ore bodies of interest were applied in three numerical classical integration techniques, i.e. Trapezoidal, Simpson's and Simpson's third-eight rule, for volume estimation. To overcome the non-uniqueness problem of DC resistivity data interpretation, the available drilling data was applied. Samples retrieved from each lode were subjected to mass and volume analysis using the CS200 electronic balance and water displacement technique, to determine the average density of each lode. Results from 2D subsurface resistivity sections showed the lead-zinc deposits as zones of low resistivity in a background of high resistivity. The 1D stratigraphic models reveal a mean thickness estimate of 11.85 m and 10.50 m for DEPOSITs' A and B, respectively. Sample densities correlate well with the average density of pure galena. Applying the scalar-geometric rule, a combined estimate of 10,778.95tonnes was obtained, representing a relatively economically viable quantity worthy of medium scale extraction.
    Źródło:
    Journal of Sustainable Mining; 2019, 18, 4; 208-225
    2300-1364
    2300-3960
    Pojawia się w:
    Journal of Sustainable Mining
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural, Mechanical and Thermodynamic Properties Under Pressure Effect of Rubidium Telluride: First Principle Calculations
    Autorzy:
    Bidai, K.
    Ameri, M.
    Ameri, I.
    Bensaid, D
    Slamani, A.
    Zaoui, A.
    Al-Douri, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/354182.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Anti-fluorite: Rb2Te; FP-LAPW; GGA
    structural properties
    thermodynamics properties
    elastic constants
    Opis:
    First-principles density functional theory calculations have been performed to investigate the structural, elastic and thermodynamic properties of rubidium telluride in cubic anti-fluorite (anti-CaF2-type) structure. The calculated ground-state properties of Rb2Te compound such as equilibrium lattice parameter and bulk moduli are investigated by generalized gradient approximation (GGA-PBE) that are based on the optimization of total energy. The elastic constants, Young’s and shear modulus, Poisson ratio, have also been calculated. Our results are in reasonable agreement with the available theoretical and experimental data. The pressure dependence of elastic constant and thermodynamic quantities under high pressure are also calculated and discussed.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 2A; 865-871
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    First-Principles Calculations of Structural, Electronic, Optical, and Thermodynamic Properties of CdS, CdTe and Their Ternary Alloys $CdS_{1-x}Te_{x}$ (0.0 ≤ x ≤1.0)
    Autorzy:
    Ameri, M.
    Mesbah, S.
    Al-Douri, Y.
    Bouhafs, B.
    Varshney, D.
    Ameri, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1364167.pdf
    Data publikacji:
    2014-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    31.15.E-
    63.20.dk
    04.25.-g
    78.66.Hf
    73.61.At
    Opis:
    Using first-principle method, we investigate the structural, electronic, optical, and thermodynamic properties of the $CdS_{1-x}Te_x$ semiconductor alloys using generalized gradient approximation for the exchange-correlation potential calculation. The ground state properties are determined for the bulk materials (CdS and CdTe) in cubic phase. Quantities such as the lattice constants and bulk modulus of interest are calculated. Detailed comparisons are made with published experimental and theoretical data and show generally good agreement. The calculated lattice constants scale linearly with composition (Vegard's law). The microscopic origins of the bowing parameter were explained using the contributions from volume deformation, charge transfer and structural relaxation approach. The refractive index and optical dielectric constant for the alloys of interest were calculated by using different models. In addition, the thermodynamic stability of the alloys was investigated by calculating the critical temperatures of alloys.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 5; 1110-1117
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of production data from hydraulically fractured horizontal wells in Marcellus Shale
    Autorzy:
    Aminian, K.
    Ameri, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/298783.pdf
    Data publikacji:
    2013
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    unconventional gas
    horizontal wells
    gaz niekonwencjonalny
    pionowe otwory wiertnicze
    Opis:
    Unconventional reservoirs play an enormous role in hydrocarbon production in the United States. Marcellus Shale, a Devonian black shale found in the Appalachian Basin, has shown notable promise in the past few years. Shale is a complicated, naturally fractured reservoir with ultra-low matrix permeability. The gas is stored in the limited pore space of these rocks and a sizeable fraction of the gas in place may be adsorbed on the organic material. Shale gas reservoirs differ from conventional reservoirs in that massive stimulation treatments are requiredto achieve economic production. Horizontal wells are the most effective in providing access to the formation to perform multi-stage hydraulic fracturing treatments. The limited field experience with multiple hydraulic fractures in horizontal wells completed in Marcellus Shale indicates that significant increase in initial production can be achieved as the number of hydraulic fractures is increased. However, the production performance, particularly over longer time periods, is not well established. The objective of this study was to investigate the long term production performance of multiply fractured horizontal wells completed in Marcellus Shale. Historical production data and stimulation treatment information have been collected and analyzed for a number of horizontal wells both in West Virginia and Pennsylvania. A commercial reservoir simulator which accounts both for dual porosity behavior and the adsorbed gas was utilized to history match the production performance. Based on the results of the history matching, the long term production performances of the multiply fractured horizontal wells were predicted. The results were then utilized to investigate the production decline behavior of Marcellus Shale horizontal wells. A number of conventional as well as shale specific production decline models were considered in these investigations. The results indicated the presence of different flow periods. The hydraulic fractures appear to dominate the early production performance which is characterized by linear flow. Gas desorption appears to impact on production decline behavior during the intermediate period. The late production is influenced by the reservoir boundaries and is controlled by natural fracture properties. A single decline model often cannot predict the entire production behavior and conventional decline analysis based on the early production data can lead to significant over-prediction of the future production rates or reserves. The results of this study can be utilized as guideline to investigate the feasibility horizontal wells with multiple hydraulic fractures and optimize the production from the shale formation.
    Źródło:
    AGH Drilling, Oil, Gas; 2013, 30, 1; 37-46
    2299-4157
    2300-7052
    Pojawia się w:
    AGH Drilling, Oil, Gas
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On pseudo BE-algebras
    Autorzy:
    Borzooei, Rajab
    Saeid, Arsham
    Rezaei, Akbar
    Radfar, Akefe
    Ameri, Reza
    Powiązania:
    https://bibliotekanauki.pl/articles/728936.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
    Tematy:
    BE-algebra
    Pseudo BE-algebra
    pseudo filter
    pseudo upper set
    Opis:
    In this paper, we introduce the notion of pseudo BE-algebra which is a generalization of BE-algebra. We define the concepts of pseudo subalgebras and pseudo filters and prove that, under some conditions, pseudo subalgebra can be a pseudo filter. We prove that every homomorphic image and pre-image of a pseudo filter is also a pseudo filter. Furthermore, the notion of pseudo upper sets in pseudo BE-algebras introduced and is proved that every pseudo filter is an union of pseudo upper sets.
    Źródło:
    Discussiones Mathematicae - General Algebra and Applications; 2013, 33, 1; 95-108
    1509-9415
    Pojawia się w:
    Discussiones Mathematicae - General Algebra and Applications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Students perceptions of the incorporation of flipped learning into L2 grammar lessons
    Autorzy:
    Noroozi, Ahmad
    Rezvani, Ehsan
    Ameri-Golestan, Ahmad
    Powiązania:
    https://bibliotekanauki.pl/articles/2097667.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Marii Curie-Skłodowskiej w Lublinie. IATEFL Poland Computer Special Interest Group
    Tematy:
    conventional classroom
    flipped classroom
    sociocultural theory of learning
    students’ perception
    Opis:
    The present study examined EFL learners’ perceptions of using flipped learning procedure in a grammar class. The participants recruited were 60 Iranian intermediate male EFL learners, randomly assigned to an experimental and a control group. The learners in the control group, having no preparation prior to class, were given direct instruction by using whiteboard with no or little use of interactivities in their grammar lessons. The instruction in the experimental group, however, featured flipped learning through WhatsApp and was augmented through in-class face-to-face discussion. Online teaching as the pre-class preparatory activity grounded the learners in the formal instruction of new grammatical concepts. The in-class time was then used by the teacher to induce learner-centered, meaningful interaction intended to render better comprehension and retention of the target grammar. The data collection instruments were College and Universities Classroom Environment Inventory (CUCEI) and a semi-structured interview. The results revealed that the participants receiving flipped learning instruction found it satisfactory, engaging, and effective. The findings add further evidence to the existing literature on flipped learning and have implications for curriculum development and pedagogy enhancement.
    Źródło:
    Teaching English with Technology; 2021, 21, 1; 112-130
    1642-1027
    Pojawia się w:
    Teaching English with Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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