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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.
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
Salem Mohamed AHMED,Nor KHALIL MD 한국유통과학회 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.7
The COVID-19 pandemic sweeping the world has rendered a large proportion of the workforce unable to commute to work, to mitigate the spread of the virus. This has resulted in both employers and employees seeking alternative work arrangements. Due to the pandemic, most if not all workers experienced work from home Hence work from home has become a policy priority for most governments. Individuals have started to change their behavior to stick to the curfew and rapidly conform to the new way of life. This study is conducted to understand how organizations and people adjust to these developments and challenges. Numerous organizations are changing to the online method of working because of the COVID-19. Because of the continuous adoption of a specific behavior after the COVID-19 pandemic situation ended, employees were expected to continue working from home. To investigate deep into the behavioral consequences of such a pandemic situation, in-depth interviews were conducted in several companies in Saudi Arabia. This study was conducted by extending the Theory of Planned Behavior (TPB) and the theory of reasoned action (TRA) to explore and assess the various factors that determine the continuous adoption intention of work-from-home by the Saudis. The finding shows that the employees’ positive attitude, subjective norms, and self-efficacy affect the employees’ intention to adopt work from home. The continuous adoption of work from home has been affected by employees’ relevant intention and controllability.
Effect of Ejector Location in Absorption Refrigeration Cycles Using Different Binary Working Fluids
Salem Yosaf,Hasan Ozcan 대한설비공학회 2019 International Journal Of Air-Conditioning and Refr Vol.27 No.1
In this study, three novel modifications of ejector-absorption refrigeration cycles (E-ARC) are investigated to evaluate the effect of ejector location on cycle performances. In the first modification (triple pressure level absorption refrigeration cycle TPL-ARC), the ejector is located at the evaporator inlet. In the second modification (double ejector absorption refrigeration cycle DE-ARC), two ejectors are used; one is located at the evaporator inlet and the other at the absorber inlet, which are coupled to each other. In the third modification (low pressure condenser absorption refrigeration cycle LPC-ARC), the steam ejector is installed at the downstream of the vapor generator discharging line. An additional flow splitter is integrated to the steam ejector outlet and part of the vapor is extracted and returned to the absorber at a pressure equal to the diffuser pressure. Effect of ejector location on thermodynamic performances are evaluated considering three different working fluids, namely ammonia–water solution (NH3–H2O), lithium bromide-water solution (H2O–LiBr), and lithium chloride–water solution (H2O–LiCl). Even though all three configurations enhance the conventional absorption refrigeration cycle (C-ARC) performances, the LPC-ARCs work at high temperature and improve the cycle performance. The TPL-ARC proves to improve the COP and exergy efficiency up to 9.14% and 7.61%, respectively, presenting the highest thermodynamic performance enhancement and lowest operating temperature.
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.
Salem Marhaba 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.1
In this paper, localized surface plasmon resonance (LSPR) of periodic two-dimensional (2D) gold nanoparticles arrays is investigated using far field polarization spectroscopy. Square and rectangular arrays of 60 nm gold nanoparticles with different interparticle spacings are fabricated with electron beam lithography (EBL). The experimental extinction cross section spectra are revealed the existence of two plasmon modes depending to the polarization direction of the incident radiation on the sample. The extinction spectra are calculated using coupled dipole approximation (CDA). Good qualitative and quantitative agreement is obtained between calculations and experimental results. Moreover, it is found that the interparticle spacing on the array was the key parameter to study the plasmon interaction between the nanoparticles and to determine the amplitude, spectral position and width of LSPR band.
Detection of unexploded ordnance (UXO) using marine magnetic gradiometer data
Salem Ahmed,Hamada Toshio,Asahina Joseph Kiyoshi,Ushijima Keisuke Korean Society of Earth and Exploration Geophysici 2005 지구물리와 물리탐사 Vol.8 No.1
여러 센서들의 배열을 이용한 최근의 해양 자력구배 측정시스템의 개발을 통하여 넓은 오염지역의 조사를 빠르게 수행할 수 있게 되었다. 그러나 물밑의 UXO 는 조류에 의해 이동할 수 있으며 따라서 이런 환경에서의 복원과정은 정적이라기 보다는 동적이 되었다. 이는 곧 성공적인 복원을 위해서는 탐지가 거의 실시간으로 이루어져야 함을 말한다. 그러므로 해양 자력탐사자료로부터 물밑 물체의 신호를 빠르게 탐지할 수 있는 신속한 해석법이 필요하다. 이 논문에서는 물밑 UXO 의 위치 및 특성을 알아내는 신속한 방법을 소개하였다. 먼저 대상체의 정밀 탐지를 위해 자력구배자료의 해석기법(해석적 신호와 Euler 방법)을 이용하며, 반복적 선형 최소자승법을 이용해 대상체의 자기 특성을 얻어낸다. 이 방법은 알고 있는 대상체에 대해 무작위 잡음을 더한 이론적 해양 자력이상에 적용되었으며, 일본의 해양 자력구배탐사 자료를 이용하여 실질적인 유용성을 예시하였다.
Anomaly Detection in Medical Wireless Sensor Networks
Salem, Osman,Liu, Yaning,Mehaoua, Ahmed Korean Institute of Information Scientists and Eng 2013 Journal of Computing Science and Engineering Vol.7 No.4
In this paper, we propose a new framework for anomaly detection in medical wireless sensor networks, which are used for remote monitoring of patient vital signs. The proposed framework performs sequential data analysis on a mini gateway used as a base station to detect abnormal changes and to cope with unreliable measurements in collected data without prior knowledge of anomalous events or normal data patterns. The proposed approach is based on the Mahalanobis distance for spatial analysis, and a kernel density estimator for the identification of abnormal temporal patterns. Our main objective is to distinguish between faulty measurements and clinical emergencies in order to reduce false alarms triggered by faulty measurements or ill-behaved sensors. Our experimental results on both real and synthetic medical datasets show that the proposed approach can achieve good detection accuracy with a low false alarm rate (less than 5.5%).