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Tytuł:
First-Principles Study of Cubic $B_{x}In_{1-x}N$ Ternary Alloys
Autorzy:
Abdiche, A.
Abid, H.
Riane, R.
Bouaza, A.
Tematy:
61.50.ks
64.70.Rb
71.15.Mb
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Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:
https://bibliotekanauki.pl/articles/1537739.pdf  Link otwiera się w nowym oknie
Opis:
We present first principles calculations of the structural and electronic properties of zinc blende BN, InN and their ternary alloy $B_{x}In_{1-x}N$ for concentrations x = 0.25, 0.5, 0.75. The computational method used is based on the full potential linearized augmented plane wave. The exchange and correlation energy is described in the local density approximation and generalized gradient approximation. We have studied the structural and electronic properties. First, the lattice constants $a_0$, bulk modulus B, pressure derivative B' for zinc blende BN, InN, and $B_xIn_{1-x}N$ solid solutions were carried out. Thereafter, the band gap energies and the densities of states of binary compounds and the ternary alloy $B_x In_{1-x}N$ were investigated. Results obtained and compared with available experimental and theoretical values show a reasonable agreement.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
First-Principles Investigation of Structural and Electronic Properties of the $B_{x}Ga_{1-x}N,$ $B_{x}Al_{1-x}N, Al_{x}Ga_{1-x}N$ and $B_{x}Al_{y}Ga_{1-x-y}N$ Compounds
Autorzy:
Djoudi, L.
Lachebi, A.
Merabet, B.
Abid, H.
Tematy:
71.15.Mb
71.20.-b
71.20.Nr
71.55.Eq
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Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:
https://bibliotekanauki.pl/articles/1418321.pdf  Link otwiera się w nowym oknie
Opis:
The structural and electronic properties of the $B_{x}Ga_{1-x}N, B_{x}Al_{1-x}N,$ $Al_{x}Ga_{1-x}N$ and $B_{x}Al_{y}Ga_{1-x-y}N$ compounds were studied using the full-potential linearized augmented plane wave method, within the generalized gradient approximation. We have compared the Al and B compositions dependence on the ground state properties: lattice parameters, bulk moduli and their pressure derivative, and band gap energies. The lattice parameters are found to change linearly for $Al_{x}Ga_{1-x}N,$ exhibit a downward bowing for both $B_{x}Al_{1-x}N$ and $B_{x}Ga_{1-x}N,$ and has a very small deviation when Al is added and a large deviation when B is incorporated for $B_{x}Al_{y}Ga_{1-x-y}N$. The calculated band gap variation for the ternaries shows that the $B_{x}Ga_{1-x}N$ has a phase transition from direct-gap to indirect-gap for high boron contents (x > 0.75). As for $B_{x}Al_{1-x}N$, a direct-gap is found in the boron content range 0.07 < x < 0.83. For $Al_{x}Ga_{1-x}N$ and $B_{x}Al_{y}Ga_{1-x-y}N$ compounds, they have been found to be direct-gap materials. The results show that the $B_{x}Ga_{1-x}N,$ $B_{x}Al_{1-x}N,$ $Al_{x}Ga_{1-x}N$ and $B_{x}Al_{y}Ga_{1-x-y}N$ materials may well be useful for optoelectronic applications.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Urban growth and spatial development along transport corridors in Dujail Municipality
Autorzy:
Abid, N. M.
Al-Khazraji, A. J. M.
Tematy:
urban sprawl
city development
spatial effect
rozwój miasta
efekt przestrzenny
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Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Powiązania:
https://bibliotekanauki.pl/articles/196206.pdf  Link otwiera się w nowym oknie
Opis:
Often, most cities grow as a result of the increase in population in addition to increased urbanization in developing cities, including in Iraq. Where urban growth is defined as a set of phenomena, which offers geographical, economic, social and administrative advantages in terms of attraction and influence, the areas associated with them tend to suffer from population concentration and accumulation in productive activities and services. This results in social impacts on an economic, geographical and administrative scale in the region itself and its surroundings [4]. Usually, growth sites in the city are places where development is feasible with the lowest possible costs on flat land and close to infrastructure services, especially transport corridors.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of annealing temperature on the optical properties of ZnO nanoparticles
Autorzy:
Ismail, R. A.
Habubi, N. F.
Abid, H. R.
Tematy:
nanoparticles
ZnO film
optical properties
drop casting technique
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Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Powiązania:
https://bibliotekanauki.pl/articles/412203.pdf  Link otwiera się w nowym oknie
Opis:
In this work, ZnO films were prepared by drop casting technique. The films were deposited on quartz substrates under different annealing time (15,30,45 and 60 min.) at a constant temperature (800 °C). The optical properties were achieved by measuring the absorbance and transmittance spectra in the wavelength range (200-900) nm. It was found that the absorbance decreases while transmission increases as the annealing time increases, while the reflectance decreases as the annealing time increases. The optical measurements indicate the kind of transition which was a direct allowed with an average band gap energies lie between 3.3 eV and 3.54 eV with the change of annealing time.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Integrated design of observer based fault detection for a class of uncertain nonlinear systems
Autorzy:
Chen, W.
Khan, A, Q.
Abid, M.
Ding, S. X.
Tematy:
detekcja uszkodzeń
obserwator
system nieliniowy
optymalizacja
odporność
fault detection
observer
nonlinear system
optimization
robustness
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Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Powiązania:
https://bibliotekanauki.pl/articles/907595.pdf  Link otwiera się w nowym oknie
Opis:
Integrated design of observer based Fault Detection (FD) for a class of uncertain nonlinear systems with Lipschitz nonlinearities is studied. In the context of norm based residual evaluation, the residual generator and evaluator are designed together in an integrated form, and, based on it, a trade-off FD system is finally achieved in the sense that, for a given Fault Detection Rate (FDR), the False Alarm Rate (FAR) is minimized. A numerical example is given to illustrate the effectiveness of the proposed design method.
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 12

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