排序方式: 共有7条查询结果,搜索用时 15 毫秒
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Aissa Wiem Ben Aissa Lassaâd Ben Amara Abdesslem Ben Haj Tlig Said Alouani Rabah 《International Journal of Earth Sciences》2017,106(8):2653-2665
International Journal of Earth Sciences - Hydrothermal ore deposits at Aïn El Araâr-Oued Belif location are classified as epithermal deposits type. The ore bodies are hosted by upper... 相似文献
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Mohamed Arfaoui Mohamed Hdi Inoubli Saïd Tlig Rabeh Alouani 《Geophysical Prospecting》2011,59(3):576-591
Triassic outcrops in the Atlassic zone of northern Tunisia may be modelled in two ways: salt bodies piercing through Cretaceous terrains or Triassic salt flows stratified within an Albian series. Both models find support from gravity data and are debatable. To evaluate the mass distribution changes with depth, the Bouguer anomaly of the El Kef‐Ouargha region was successively decomposed into regional and residual components to construct multiple pseudo‐depth slices and apparent density maps. Analyses of gravity lows clearly show a vertical continuity of less dense materials below the Triassic salt outcrops. These features can be explained by salt diapirism during Mesozoic and Cenozoic. Further, gravity data tend to indicate less dense materials below Aptian outcropping in Jebel Aite (Oued Bou Adila); thus suggesting Triassic materials occurring at depth. In addition, dense entities were recognized under Mio‐Pliocene and Quaternary deposits, which are thought to correspond to Cretaceous paleoshoals currently collapsed by non‐outcropping faults. Our findings lend support to a diapir model intruding overburden rather than the salt glacier model stratified in the Albian series proposed by some authors as the genetic structural model for Triassic material‐bearing series in the north of Tunisia. 相似文献
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Fathallah Alouani Bibi James Binney Katherine Blundell Henrik Omma 《Astrophysics and Space Science》2007,311(1-3):317-321
We analyzed the feedback of AGN jets on cooling flow clusters using three-dimensional AMR hydrodynamic simulations. We studied
the interaction of the jet with the intracluster medium and creation of low X-ray emission cavities (Bubbles) in cluster plasma.
The distribution of energy input by the jet into the system was quantified in its different forms, i.e. internal, kinetic
and potential. We find that the energy associated with the bubbles, (pV+γ
pV/(γ−1)), accounts for less than 10 percent of the jet energy. 相似文献
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Comparison of ordinary kriging and artificial neural network for spatial mapping of arsenic contamination of groundwater 总被引:3,自引:2,他引:1
Mohammad Chowdhury Ali Alouani Faisal Hossain 《Stochastic Environmental Research and Risk Assessment (SERRA)》2010,24(1):1-7
In this technical note, we investigate the hypothesis that ‘non-linearity matters in the spatial mapping of complex patterns of groundwater arsenic contamination’. The spatial mapping pertained to data-driven techniques of spatial interpolation based on sampling data at finite locations.
Using the well known example of extensive groundwater contamination by arsenic in Bangladesh, we find that the use of a highly
non-linear pattern learning technique in the form of an artificial neural network (ANN) can yield more accurate results under
the same set of constraints when compared to the ordinary kriging method. One ANN and a variogram model were used to represent
the spatial structure of arsenic contamination for the whole country. The probability for successful detection of a well as
safe or unsafe was found to be atleast 15% larger than that by kriging under the country-wide scenario. The probability of
false hopes, which is a serious issue in public health monitoring was found to be significantly lower (by more than 10%) than
that by kriging. 相似文献
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S. Rossano Ch. Brouder M. Alouani M. -A. Arrio 《Physics and Chemistry of Minerals》2000,27(3):170-178
The transition energies responsible for optical absorption spectra can be obtained by crystal-field analysis, but the transition
intensities are notoriously difficult to calculate. This paper examines the basic ingredients of the calculation of optical
spectrum intensities. Magnetic dipole and electric quadrupole transitions intensities are evaluated, as well as the direct
d(Ni2+) to p(O2−) electric dipole transitions. All these contributions are shown to be small in the optical range, so that spectral intensities
are due to the mixing of odd orbitals with the Ni2+ 3d
n
states.
Received: 11 November 1997 / Revised, accepted: 6 September 1999 相似文献
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