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A Rare Cause of Thoracic Spinal Cord Compression by Multiple Large Tarlov Cysts
Ahmed-Salem Kleib,Sidi-Mohamed Salihy,Hussein Hamdi,Romain Carron,Outouma Soumaré,Ahmed-Salem Kleib 대한신경손상학회 2018 Korean Journal of Neurotrauma Vol.15 No.1
Spinal extradural arachnoid cyst (SEAC) is a rare cause of spinal cord compression. Bifocal location of thoracic and sacralSEACs is rarely reported in the literature. We report a case of thoracic spinal cord compression by SEAC associated withasymptomatic multiple sacral Tarlov cysts (TC). The surgical management and postoperative outcome of the patient arediscussed. A 34-year-old woman was referred to the hospital for acute thoracic pain with a history of chronic long-standing back pain. She complained of walking diffculties. Neurological examination demonstrated incomplete spastic paraplegia with sensory level in T9. Magnetic resonance imaging revealed a large cystic formation from T7-11 and at the levelof the sacrum. We performed laminectomies at the level of interest from T7-11. The cysts were dissected from the underlying dura after removal of the cerebrospinal fluid. We found nerve tissue in the cysts. We excised the cyst and preservedthe nerve roots. Subsequently, a duraplasty was performed with autologous grafts from the lumbar fascia. The conditionof the patient improved after surgery and he was recovering well at follow-up. Although the surgical treatment of TC iscontroversial, especially at the sacral lumbar level, decompression at the dorsal level in this case is indisputable
Shiva Salem,Amin Salem,Aylin Agha Babaei 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.23 No.-
The nano-porous adsorbents were initially produced by acid treatment of natural clay. The effects of some important factors such as acid type, concentration and residence time were evaluated on porous structure of adsorbent. A reduction about 2.7 A˚ was observed in the distance of montmorillonite layers due to replacement of hydrogen ions in the presence of sulfuric acid. The number of nano-pores, 12 nm, was preferable for removal of contaminations from spent engine oil, depending on the activation agent type in the treatment process. The results are very promising for reduction of adsorbent content in the regeneration of waste lubricant oil.
Elastic-plastic analysis of the J integral for repaired cracks in plates
Salem, Mokadem,Bouiadjra, Belabbes Bachir,Mechab, Belaid,Kaddouri, Khacem Techno-Press 2015 Advances in materials research Vol.4 No.2
In this paper, three-dimensional finite element method is used to analyze the J integral for repaired cracks in plates with bonded composite patch and stiffeners. For elastic the effect of cracks, the thickness of the patch ($e_r$) and properties of the patch are presented for calculating the J integral. For elastic-plastic a several calculations have been realized to extract the plasticized elements around the crack tip of repaired and un-repaired crack. The obtained results show that the presence of the composite patch and stiffener reduces considerably the size of the plastic zone ahead of the crack. The effects of crack size and the inter-distance of repaired cracks were analysed.
Real-Time Implementation of On-Line Trained Neuro-Controller for a BLDC Motor
Salem, M.M.,Zahran, M.B.,Atia, Yousry,Zaki, A.M. The Korean Institute of Power Electronics 2003 JOURNAL OF POWER ELECTRONICS Vol.3 No.1
Implementation and experimental verification of a simple neuro-controller (SNC) as a speed controller for a brush less DC (BLDC) motor is presented. The SNC with one weight and a linear hard limit activation function is trained on-line using the back propagation algorithm. A modified error function is used to ensure good performance during the on-line training, which has been used without previous off-line training. The SNC has been implemented using a computer-interface card mounted on a PC. The driving system performance has been investigated by a number of experimental tests for a variety of input reference speed trajectories.
Some New Hilbert Type Inequalities
Salem, Shaban Raslan Department of Mathematics 2006 Kyungpook mathematical journal Vol.46 No.1
In this paper, we obtain some inequalities similar to Hilbert type. Some new inequalities are also given.
Graphene Reconfigurable Antenna for GPS and Iridium Applications
Salem GAHGOUH,Ali GHARSALLAH International Journal of Computer ScienceNetwork S 2023 International journal of computer science and netw Vol.23 No.3
A frequency reconfigurable antenna based on graphene and used for multi-band wireless communications is presented in this article. The proposed antenna, which consists of two radiating rectangular loops with a graphene extension, is analyzed for Global Positioning System (GPS) and Iridium applications. Its operating frequency is tuned through the implementation of a layer of graphene and thereby adjusting the applied gate bias. Furthermore, the results show a novel use of graphene for microwave frequencies while achieving a frequency reconfiguration with an improvement of the impedance matching and the gain. The results also prove the importance of graphene, with its exceptional properties, for a promising future in nano-electronics.
Some New Hilbert Type Inequalities
SALEM, SHABAN RASLAN 대한수학회 2006 Kyungpook mathematical journal Vol.46 No.1
In this paper, we obtain some inequalities similar to Hilbert type. Some new inequalities are also given.
NUMERICAL SIMULATIONS FOR THE CONTRACTION FLOW USING GRID GENERATION
Salem, S.A. 한국전산응용수학회 2004 Journal of applied mathematics & informatics Vol.16 No.1
We study the incomprssible Navier Stokes equations for the flow inside contraction geometry. The governing equations are expressed in the vorticity-stream function formulations. A rectangular computational domain is arised by elliptic grid generation technique. The numerical solution is based on a technique of automatic numerical generation of acurvilinear coordinate system by transforming the governing equation into computational plane. The transformed equations are approximated using central differences and solved simultaneously by successive over relaxation iteration. The time dependent of the vorticity equation solved by using explicit marching procedure. We will apply the technique on several irregular-shapes.
Salem Saidi,Rabeh Abbassi,Souad Chebbi 제어·로봇·시스템학회 2016 International Journal of Control, Automation, and Vol.14 No.5
This paper presents a new control strategy which is based on a switching table applied for Virtual FluxDirect Power Control (VF-DPC) of voltage source inverter based shunt active power filter (SAPF). This controlmethod is applied to eliminate harmonic pollution and compensate the reactive power in the presence of nonlinearloads and unbalanced sources. Its main goal is to select switching states of the SAPF converter appropriately basedon a look-up table established by hysteresis controllers acting on the instantaneous error between the commandedand VF-estimated values of active and reactive power. Our method aims to improve the electrical quantity behaviorin steady and dynamic states while reducing the installing cost of the filter through eliminating the AC line voltagesensors. Facing to disturbances affecting the electrical network, a phase locked loop (PLL) has been integrated .Thecontrol strategy proposed for the active filter has been tested in the Matlab/Simulink environment.
Physicochemical Changes in UV-Exposed Low-Density Polyethylene Films
Salem, M.A.,Farouk, H.,Kashif, I. The Polymer Society of Korea 2002 Macromolecular Research Vol.10 No.3
Unstabilized low-density polyethylene (LDPE) films and films formulated with hindered amine light stabilizer (HALS) were exposed to UV-radiation; and the physicochemical changes during photooxidation processes have been investigated using tensile, FTIR spectre-photometric and thermal analytical (DSC) techniques. The dependence of tensile properties (elongation- and stress-at-break), carboxyl index and heat of fusion on UV-irradiation time have been discussed. The use of HALS is found to be effective in maintaining the UV-mechanical properties of the LDPE films. The experimental results showed that there exists no correlation between mechanical properties and carbonyl index, whereas crystallinity correlates well with carbonyl index in unstabilized and stabilized films for irradiation times greater than 100 h. The rate of formation of carbonyl groups is found to be dependent on UV exposure time. Crystallinity of the film samples is strongly influenced by both exposure time and presence of HALS.