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Search Results: 1 - 10 of 711 matches for " Nedal Taha "
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Performance Evaluation of a Topology Control Algorithm for Wireless Sensor Networks
Nedal Ababneh
International Journal of Distributed Sensor Networks , 2010, DOI: 10.1155/2010/671385
Abstract: A main design challenge in the area of sensor networks is energy efficiency to prolong the network operable lifetime. Since most of the energy is spent for radio communication, an effective approach for energy conservation is scheduling sleep intervals for extraneous nodes, while the remaining nodes stay active to provide continuous service. Assuming that node position information is unavailable, we present a topology control algorithm, termed OTC, for sensor networks. It uses two-hop neighborhood information to select a subset of nodes to be active among all nodes in the neighborhood. Each node in the network selects its own set of active neighbors from among its one-hop neighbors. This set is determined such that it covers all two-hop neighbors. OTC does not assume the network graph to be a Unit Disk Graph; OTC also works well on general weighted network graphs. OTC is evaluated against two well-known algorithms from the literature, namely, Span and GAF through realistic simulations using TOSSIM. In terms of operational lifetime, load balancing and Spanner property OTC shows promising results. Apart from being symmetric and connected, the resulting graph when employing OTC shows good spanner properties. 1. Introduction Advances in miniaturization of microelectronic and mechanical structures (MEMSs) have led to battery-powered sensor nodes that have sensing, communication, and processing capabilities [1, 2]. These sensor nodes can be networked in an ad hoc fashion to perform distributed sensing and information processing in many situations. Such sensor networks are typically inexpensive and can be deployed in inhospitable terrains or in hostile environments to provide continuous monitoring. Wireless sensor networks have therefore attracted considerable attention recently [2–4]. These networks are important for a number of applications such as coordinated target detection and localization, surveillance, and environmental monitoring. In the recent years, wireless sensor networks have been deployed for a number of applications. In the spring of 2002, the Intel Research Laboratory at Berkeley initiated a collaboration with the College of the Atlantic in Bar Harbor and the University of California at Berkeley to deploy wireless sensor networks on Great Duck Island, Maine [5, 6]. These networks monitor the microclimates in and around nesting burrows used by Leach’s storm Petrel. The goal of this project is to develop a habitat monitoring kit that enables researchers worldwide to engage in the nonintrusive and nondisruptive monitoring of sensitive wildlife
Self-Knotting of a Nasogastric Tube
Egan, Daniel,Shami, Nedal
Western Journal of Emergency Medicine : Integrating Emergency Care with Population Health , 2011,
Abstract: [West J Emerg Med. 2011;12(2):266-267.]
Investigating Cognitive Processes Underlying Reading in Arabic: Evidence from Typical and Poor Reading Performance  [PDF]
Haitham Taha
Psychology (PSYCH) , 2013, DOI: 10.4236/psych.2013.412148

The current study has examined by which cognitive factors at the field of phonological and visual processing, rapid automatized naming and morphological awareness, contribute to reading and decoding abilities among typical and poor native Arabic readers. In the current study, the performances of two groups of participants, typical and poor readers were compared through tasks that examined their performance with regard to the areas of functions mentioned above in addition to other tasks that examined their performance in reading meaningful and pseudo words. The study’s results have indicated that the visual and phonological processing skills play an important role in reading among typical and poor readers as well. Moreover, it was found that the visual and phonological processing skills of participants with poor reading skills were lower in comparison to participants with typical reading abilities.

Ischemic Monomelic Neuropathy after a Brachio-Cephalic AVF Creation: A Case Report and Review of Literature  [PDF]
Mohamad Taha
World Journal of Cardiovascular Surgery (WJCS) , 2017, DOI: 10.4236/wjcs.2017.73004
Abstract: Ischemic monomelic neuropathy (IMN) is an under-diagnosed and disabling complication of upper extremity hemodialysis access. The hemodynamic disturbance that occurs during the time of access creation can lead to both neurologic and ischemic complications. These complications are most commonly seen following proximal procedures involving the upper limbs. Diagnosis and treatment are often delayed, and even with early intervention, neurologic dysfunction may be irreversible. IMN can lead to significant long-term disability. Almost all cases of IMN occur with brachial artery-based access, procedures and the vast majority of patients are diabetic and females. I report a case of IMN after left BC AVF operation which was treated successfully by early access ligation, providing a review of the literature.
Genotypes and serotype distribution of macrolide resistant invasive and non- invasive Streptococcus pneumoniae isolates from Lebanon
Nedal Taha, George F Araj, Rima H Wakim, Souha S Kanj, Zeina A Kanafani, Ahmad Sabra, Marie-Therese Khairallah, Farah J Nassar, Marwa Shehab, Maysa Baroud, Ghassan Dbaibo, Ghassan M Matar
Annals of Clinical Microbiology and Antimicrobials , 2012, DOI: 10.1186/1476-0711-11-2
Abstract: Forty four macrolide resistant and 21 macrolide susceptible S. pneumoniae clinical isolates were tested for antimicrobial susceptibility according to CLSI guidelines (2008) and underwent molecular characterization. Serotyping of these isolates was performed by Multiplex PCR-based serotype deduction using CDC protocols. PCR amplification of macrolide resistant erm (encoding methylase) and mef (encoding macrolide efflux pump protein) genes was carried out.Among 44 isolates resistant to erythromycin, 35 were resistant to penicillin and 18 to ceftriaxone. Examination of 44 macrolide resistant isolates by PCR showed that 16 isolates harbored the erm(B) gene, 8 isolates harbored the mef gene, and 14 isolates harbored both the erm(B) and mef genes. There was no amplification by PCR of the erm(B) or mef genes in 6 isolates. Seven different capsular serotypes 2, 9V/9A,12F, 14,19A, 19F, and 23, were detected by multiplex PCR serotype deduction in 35 of 44 macrolide resistant isolates, with 19F being the most prevalent serotype. With the exception of serotype 2, all serotypes were invasive. Isolates belonging to the invasive serotypes 14 and 19F harbored both erm(B) and mef genes. Nine of the 44 macrolide resistant isolates were non-serotypable by our protocols.Macrolide resistance in S. pneumoniae in Lebanon is mainly through target site modification but is also mediated through efflux pumps, with serotype 19F having dual resistance and being the most prevalent and invasive.Streptococcus pneumoniae continues to be a major cause of morbidity and mortality in humans. It is one of the most significant bacterial pathogens causing community acquired infections, most notably pneumonia, otitis media, bacteremia, and meningitis [1,2]. Treatment of pneumococcal infections is becoming difficult due to the high prevalence of penicillin-resistant strains and to the rapid development of resistance to other antimicrobials including macrolides. These drugs are extensively used for the treat
Equilibrium Isotherms and Kinetic Studies of Removal of Methylene Blue Dye by Adsorption onto Miswak Leaves as a Natural Adsorbent  [PDF]
Taha M. Elmorsi
Journal of Environmental Protection (JEP) , 2011, DOI: 10.4236/jep.2011.26093
Abstract: In this research miswak leaves, agriculture wastes, available in large quantity in Saudi Arabia, was used as low-cost adsorbent for removing methylene blue (MB) dye. Equilibrium behavior of miswak leaves was investigated by performing batch adsorption experiments. The effects of [MB] 0, pH, contact time and adsorbent dose were evaluated. An alkaline pH (10.6) was favorable to the adsorption of MB dye. Adsorption isotherm models, Langmuir, Freundlich and Temkin were used to simulate the equilibrium data. Langmuir equation was found to have the highest value of R2 compared with other models. Furthermore, it was found that miswak leaves have a high adsorptive capacity towards MB dye (200 mg/g) and show favorable adsorption of MB dye with separation factor (RL < 1). In addition, pseudo-first- order, pseudo-second order and intra-particle diffusion were used to study the kinetics of MB adsorption onto miswak leaves. Adsorption process undergoes pseudo-second order kinetic as proved by the high value of R2 and the low value of sum of squared error (SSE percentage). Results indicated that intra-particle diffusion is not the limiting step, and the adsorption process is spontaneous as indicated by the negative value of the .
Transient and Steady State Currents of Bisphenol A Corncobs Sample  [PDF]
Taha A. Hanafy
Advances in Materials Physics and Chemistry (AMPC) , 2011, DOI: 10.4236/ampc.2011.13017
Abstract: Transient current (I-t), current-voltage (I-V) characteristics, and dc conductivity ln(σ) for bisphenol A corn-cobs (BPACC) sample were investigated. At higher temperatures, I-V characteristics reveal that the dc cur-rent for the sample undergoes two regions one due to ohmic conduction and the other has been attributed to Space charge limited current (SCLC). The activation energy (Ea), the electron mobility μo), effective electron mobility ?μe), the concentration of the charge’s concentrations in conduction band, trapping factor (θ) and the trap concentration (Nt) were calculated. At lower temperatures, the dc current exhibits a peculiar behavior for I-t regime and I-V characteristics. Transient current of BPACC sample exhibits approximately constant value at constant electric field and it has saturation value for I-V characteristics. The attained results suggest strongly the applicability of this material in the electrical applications.
Crystal structure, thermal analysis and IR spectroscopic investigation of bis (N-methyl anilinium) sulfate  [PDF]
Taha Guerfel, Amor Jouini
Open Journal of Inorganic Chemistry (OJIC) , 2011, DOI: 10.4236/ojic.2011.13007
Abstract: Chemical preparation, X-ray single crystal, thermal analysis and IR spectroscopic investigation of (C7H10N)2 SO4 denoted NMAS are described. The NMAS crystallizes in the triclinic system with P-1 space group. Its unit cell dimensions are a = 9.6150(5) Å, b = 9.9744(3) Å, c = 10.2767(6) Å, α = 68.069(3)°, β = 62.929(2)°, γ = 67.285(3)° with V = 785.72(7) Å3 and Z = 2. The structure has been solved using direct method and refined to a reliability R factor of 3.62%. The NMAS structure is built up from chains containing all the components of the structure and parallel to the b axis, linked via N—H­­­­­···O hydrogen bonds. Stability between successive chains is performed by weak interactions originating from the organic cations.
Dielectric and Electric Modulus Behavior of Chlorinated Poly(Vinyl Chloride) Stabilized with Phenyl Maleimide  [PDF]
Taha A. Hanafy
Advances in Materials Physics and Chemistry (AMPC) , 2012, DOI: 10.4236/ampc.2012.24038

Dielectric constant, ε', dielectric loss factor, ε\", electric modulus, M, and ac conductivity, σac, of pure CPVC and that stabilized with 10 wt% of phenyl maleimide, PM, have been carried out. The dielectric properties have been studied in the temperature and frequency ranges; 310 K - 450 K and 1 kHz- 4 MHz, respectively. The incorporation of 10 wt% of PM as stabilizer for CPVC leads to reduce its Tg from 405K to 378K at 10 kHz. PM molecules within CPVC structure reduce the double bond, stabilizer effect, and cause the widely spacing between CPVC main chains, plasticizer effect.  Three dielectric relaxation processes namely ρ, α', and α were observed for pure CPVC. The first process was explained based on space charge formation or Maxwell-Wagner-Sillers, MWS, polarization. The second one is due to the segmental motion of the branching of CPVC. The third process occurs around the glass-rubber temperature, Tg, and is related to the micro-Brownian motion of the main polymer chain. Electric modulus and ac conductivity reveal that the conduction mechanism of CPVC is follow the correlated barrier hopping, CBH, while stabilized sample exhibits a quantum mechanical tunneling, QMT, type conduction.

The use of fiberoptic bronchoscope to remove aspirated tracheobronchial foreign bodies: Our experience  [PDF]
Abdulsalam Y. Taha
Case Reports in Clinical Medicine (CRCM) , 2013, DOI: 10.4236/crcm.2013.25077
Abstract: Background: Foreign body (FB) aspiration is a common emergency in our practice. The routine method of removal is via rigid bronchoscopy (RB) under general anesthesia. This is the preferred procedure particularly in children who form the major affected population. Fiberoptic bronchoscopy (FOB) has also been used for FB removal in many countries, though in Iraq, the standard mean remains rigid bronchoscopy. Objective: Herein, we present 5 cases of FB inhalation in adults in whom FOB was used for removal. The aim is to test its feasibility with literature review. Setting: the department of thoracic surgery/Sulaimania Teaching Hospital/Sulaimania/Iraq. Study Design: a prospective study of 5 patients. Patients and methods: 5 patients (3 females and 2 males) with different bronchial or laryngeal FBs in whom FOB was used as a method for removal are presented. The age ranged from 16 to 71 years. The clinical and radiographic features are recorded. In all these patients, initial FOB examination under local anesthesia transorally or via tracheotomy stoma was done. When removed by this method failed, RB under GA was used and when this failed, thoracotomy was the last resort. Results and Conclusions: FBs encountered in this paper consisted of pins (n = 2), sewing needle (n = 1), speech valve (n = 1) and a medical leach (n = 1). Three FBs (medical leach, speech valve and one pin) were successfully removed by FOB. A pin in RMB was visualized but failed to be removed by FOB and therefore, RB was required for its retrieval, while a needle in left lower lobe was invisible by both FOB and RB and thus surgery was necessary to remove it. We conclude that in adolescent or adult patients with bronchial FBs, FOB should be tried first for removal. If this fails then RB can be used. To increase its success, FOB should be combined with certain accessories like special FB forceps and fluoroscopy.
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