Jubail Industrial City, Saudi Arabia
Jubail Industrial City, Saudi Arabia

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Alshehri S.A.,Jubail University College
Progress In Electromagnetics Research M | Year: 2016

Hybrid pattern recognition is used to predict the types of insulation materials used inside wall systems of building envelopes. The hybrid pattern recognition features vector is built using the characteristics of UWB signals. UWB signals can penetrate objects, resulting in scattered signals based on the object’s dielectric properties. The object’s dielectric properties and structure have a signature within the scattered signals. This paper demonstrates that proper hybrid pattern recognition can be used to experimentally detect the existence and the type of insulation material inside wall systems with a high success rate. © 2016, Electromagnetics Academy. All rights reserved.


Shuttleworth I.G.,Jubail University College
Applied Surface Science | Year: 2011

The electronic structure of the FCC, HCP and 2-fold bridge phases of the (√3 × √3)R30°-Cu 2Si/Cu(1 1 1) surface alloy have been investigated using LCAO-DFT. Analysis of the total electron density, partial density-of-states (PDOS) and crystal orbital overlap population (COOP) curves for the system have shown a surprising similarity between the intra- and inter-layer Si-Cu bond for each phase. Low hybridization between the Si 3s and 3p orbitals results in a low directionality of the Si-Cu bond within each of phase. The Si 3s orbitals are shown to form covalent bonds with their surrounding Cu atoms whereas the Si 3p and 3d orbitals are shown to form combinations of covalent and metallic bonds. The Si-Cu interaction is shown clearly to extend to the second layer of the alloy in deference to previous studies of Si/Cu alloys. © 2011 Elsevier B.V. All rights reserved.


Shuttleworth I.G.,Jubail University College
Chemical Physics Letters | Year: 2013

The pairing-row (pr) reconstructed (1 × 2)-H/Pd(1 1 0) surface has been shown to be paramagnetic with a lower magnetic susceptibility than that of clean Pd(1 1 0). The magnetic properties of the surface are shown to be dominated by the Pd rather than H electronic states and act to reduce surface magnetism; however, the Pd states are highly dependent on the H-driven reconstruction. LDA band structures show curvature similar to that obtained experimentally and dominant features in the experimentally-observed ARUPS spectra at S̄ are explained by strong Pd-based scattering rather than magnetic mechanisms. © 2013 Elsevier B.V. All rights reserved.


Ali K.M.,Jubail University College
Proceedings - 2012 4th International Conference on Computational Intelligence, Communication Systems and Networks, CICSyN 2012 | Year: 2012

Digital Forensics is a new discipline in computer science, which was developed as the response to the increased unauthorized activities in computer and information systems. As a result of the increasing dependency of the society and the business on information systems and the fact that e-commerce and online business became essential part of today's world business, computer attacks and cyber crimes are continually on rise. Due to various reasons, the legal system, law enforcement, computer forensics and investigations seem to be behind in their efforts to track down criminals and successfully to prosecute them. This paper gives an overview of forensic computing and discusses key issues to be considered in forensic investigations and digital evidence analysis processes. The paper also identifies best practices for digital forensics investigation process and addresses key elements of forensic computing managerial implications. © 2012 IEEE.


Shuttleworth I.G.,Jubail University College
Journal of Physics and Chemistry of Solids | Year: 2013

The pure and hydrogenated copper system CuH n (n=0, 0.25, 0.50, 0.75 and 1) has been investigated using LCAO-DFT. The average H-Cu (Cu-Cu) bonding interaction increases (decreases) with n whilst concurrent orbital-resolved studies of the H-Cu interactions showed that the (non-)directional H-Cu bonds become more (less) bonding. This preference for directional bonds is reflected in the Cu-Cu interactions. CuH 0.25 is shown to have an unusually localized electronic structure compared to the more hydrogenated systems, and the origins of this structure are discussed. © 2012 Elsevier Ltd. All rights reserved.


Shuttleworth I.G.,Jubail University College
Applied Surface Science | Year: 2012

The interaction of SiH n and CH n (n = 1,⋯,3) fragments with the three-fold sites of Cu(1 1 1) has been investigated using LCAO-DFT. The binding site preference for the HCP site (SiH n) has been shown to be due to the removal of unoccupied Si 3p-Cu 4s anti-bonding states by the second layer Cu ion cores. A similar but less pronounced effect is shown between the C 2p-Cu 4s interaction for CH n fragments bound in the FCC site. © 2012 Elsevier B.V. All rights reserved.


Shuttleworth I.G.,Jubail University College
Applied Surface Science | Year: 2012

The electronic structure of the c(2 × 2)-Si/Cu(0 1 1) surface alloy has been investigated and compared to the structures seen in the three phases of the (√3 × √3)R30°Cu 2Si/Cu(1 1 1) system, using LCAO-DFT. The weighted surface energy increase between the alloyed Cu(0 1 1) and Cu(1 1 1) surfaces is 126.7 meV/Si atom. This increase in energy for the (0 1 1) system when compared to the (1 1 1) system is assigned to the transition from a hexagonal to a rectangular local bonding environment for the Si ion cores, with the hexagonal environment being energetically more favorable. The Si 3s state is shown to interact covalently with the Cu 4s and 4p states whereas the Si 3p state, and to a lesser extent the Si 3d state, forms a mixture of covalent and metallic bonds with the Cu states. The Cu 4s and 4p states are shown to be altered by approximately the same amount by both the removal of Cu ion cores and the inclusion of Si ion cores during the alloying of the Cu(0 1 1) surface. However, the Cu 3d states in the surface and second layers of the alloy are shown to be more significantly altered during the alloying process by the removal of Cu ion cores from the surface layer rather than by the addition of Si ion cores. This is compared to the behavior of the Cu 3d states in the surface and second layers of the each phase of the (√3 × √3)R30°-Cu 2Si/Cu(1 1 1) alloy and consequently the loss of Cu-Cu periodicity during alloying of the Cu(0 1 1) surface is conjectured as the driving force for changes to the Cu 3d states. The accompanying changes to the Cu 4s and 4p states in both the c(2 × 2)-Si/Cu(0 1 1) and (√3 × √3)R30°-Cu 2Si/Cu(1 1 1) alloys are quantified and compared. The study concludes with a brief quantitative study of changes in the bond order of the Cu-Cu bonds during alloying of both Cu(0 1 1) and Cu(1 1 1) surfaces. © 2011 Elsevier B.V. All rights reserved.


Shuttleworth I.G.,Jubail University College
Chemical Physics Letters | Year: 2011

The formation of the hydrogenic sub-surface layer during the early stages of silane dosing on Cu(1 1 1) has been shown to be due to the interaction between the 1t 2 state of the silane molecule and the Cu 3d surface band. The concurrently formed delocalised Cu 4s/4p surface band has been seen to interact with the 2a 1 state of the silane molecule. The electronic structure of the hydrogenated Cu(1 1 1) surface shows that the hydrogen ion cores induce a rotation of the surface Cu 3d states and a repolarisation of the more diffuse Cu 4s and 4p surface states. © 2011 Elsevier B.V. All rights reserved.


Shuttleworth I.G.,Jubail University College
Surface Science | Year: 2013

A novel method of band structure analysis based on the atomic orbital (AO) coefficients in LCAO-DFT has been applied to the (1 × 2)-H/Pd(110)-pr system. The analysis has revealed symmetry-dependent Pd 4d band splitting due to H ligand effects; ensemble effects due to the (1 × 2) Pd reconstruction are shown to be relatively minor. © 2013 Elsevier B.V. All rights reserved.


Sivakumar R.,Jubail University College
Environmental Earth Sciences | Year: 2016

The background indoor gamma radiation in the residential places was estimated using CaSO4:Dy-based thermoluminescent dosimeters. The indoor gamma dose varied from 71 to 327 nGy h−1 with a mean value of 162 ± 31 nGy h−1. The highest gamma dose was observed in summer and the lowest in winter. The indoor gamma radiation was also found to vary with the type of house and building materials used. Indoor radon, thoron and progeny levels were measured for different types of dwellings during four seasons of a year using LR 115 type II film-based solid state nuclear track detectors loaded in twin chamber plastic cups. The average highest radon, thoron and progeny were observed during winter, and the corresponding lowest values were observed during summer. The concentrations of radon, thoron and progenies were found to vary with the type of houses and building materials used. The highest values were observed in mud houses, and the lowest values were recorded in wooden houses. This observed variation may be attributed to changes in ventilation conditions and exhalation rate of 222Rn and 220Rn from the floor and walls of the houses. The effective dose received by the general public due to indoor gamma radiation was found to be 0.79 mSv y−1 and the corresponding values due to radon, thoron were 1.02, and 0.54 mSv y−1, respectively. The inhalation dose received by the general public of the study area was found to be lesser than the action limit of International Commission on Radiological Protection (ICRP), 2009. © 2016, Springer-Verlag Berlin Heidelberg.

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