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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
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.
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 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.
Retrofit of a UK residential property to achieve nearly zero energy building standard
Salem, Radwa,Bahadori-Jahromi, Ali,Mylona, Anastasia,Godfrey, Paulina,Cook, Darren Techno-Press 2018 Advances in environmental research Vol.7 No.1
It is currently agreed upon that one of the major challenges in the construction industry is the energy efficiency of existing buildings. The World Meteorological Organisation (WMO) and United Nations (UN) have reported that the concentration of global atmospheric carbon dioxide has increased by an average of 50%, a record speed, from 2015 to 2016. The housing sector contributes to 45% of the UK's carbon emissions. To help tackle some of those issues the recast Energy Performance Building Directive (EBPD) has introduced Nearly Zero Energy Buildings (NZEBs) in the coming years (including buildings that will undergo refurbishment/renovations). This paper will explore the retrofitting of a UK residential dwelling using Thermal Analysis Simulation (TAS, EDSL) software by focusing on building fabric improvements and usage of on-site renewables. The CIBSE Test Reference Year (TRY) weather data has been selected to examine the performance of the building under current and future climate projections. The proposed design variables were finally implemented in the building altogether on TAS. The simulation results showed a reduction in the building's annual energy consumption of $122.64kWh/m^2$ (90.24%). The greatest savings after this were achieved for the annual reduction in carbon emissions and avoided emissions, which were 84.59% and $816.47kg/CO_2$, respectively.
Salem Salah Abood,Rashidbenam Zahra,Jasman Mohd Hafidzul,Ho Christopher Chee Kong,Sagap Ismail,Singh Rajesh,Yusof Mohd Reusmaazran,Md. Zainuddin Zulkifli,Haji Idrus Ruszymah Bt,Ng Min Hwei 한국조직공학과 재생의학회 2020 조직공학과 재생의학 Vol.17 No.4
Background: The urinary tract can be affected by both congenital abnormalities as well as acquired disorders, such as cancer, trauma, infection, inflammation, and iatrogenic injuries, all of which may lead to organ damage requiring eventual reconstruction. As a gold standard, gastrointestinal segment is used for urinary bladder reconstruction. However, one major problem is that while bladder tissue prevents reabsorption of specific solutes, gastrointestinal tissue actually absorbs them. Therefore, tissue engineering approach had been attempted to provide an alternative tissue graft for urinary bladder reconstruction. Methods: Human adipose-derived stem cells isolated from fat tissues were differentiated into smooth muscle cells and then seeded onto a triple-layered PLGA sheet to form a bladder construct. Adult athymic rats underwent subtotal urinary bladder resection and were divided into three treatment groups (n = 3): Group 1 (“sham”) underwent anastomosis of the remaining basal region, Group 2 underwent reconstruction with the cell-free scaffold, and Group 3 underwent reconstruction with the tissue-engineered bladder construct. Animals were monitored on a daily basis and euthanisation was performed whenever a decline in animal health was detected. Results: All animals in Groups 1, 2 and 3 survived for at least 7 days and were followed up to a maximum of 12 weeks post-operation. It was found that by Day 14, substantial ingrowth of smooth muscle and urothelial cells had occurred in Group 2 and 3. In the long-term follow up of group 3 (tissue-engineered bladder construct group), it was found that the urinary bladder wall was completely regenerated and bladder function was fully restored. Urodynamic and radiological evaluations of the reconstructed bladder showed a return to normal bladder volume and function.Histological analysis revealed the presence of three muscular layers and a urothelium similar to that of a normal bladder. Immunohistochemical staining using human-specific myocyte markers (myosin heavy chain and smoothelin) confirmed the incorporation of the seeded cells in the newly regenerated muscular layers. Conclusion: Implantation of PLGA construct seeded with smooth muscle cells derived from human adipose stem cells can lead to regeneration of the muscular layers and urothelial ingrowth, leading to formation of a completely functional urinary bladder.
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%).
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.