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Hossam Hodhod,Mostafa A. M. Abdeen 대한토목학회 2011 KSCE JOURNAL OF CIVIL ENGINEERING Vol.15 No.8
Utilization of fibers as concrete reinforcement is one method of preserving environment through the recycling of agriculture and industrial wastes. However, the optimum and efficient application of these fibers requires a measurable evaluation of their effect on properties and performance of concrete. In this study, the application of metallic steel fibers and natural (Linen) fibers in concrete industry is investigated, experimentally. Twenty one mixes are made with different mix proportions and with different types of fibers. The parameters are concrete characteristic strength, age and type of reinforcing fibers. Compressive, tensile and impact strength were measured for all mixes in addition to the residual compressive strength after exposure to elevated temperature. Measurements were also made using two Non Destructive Testing (NDT) techniques. Experimental results were compared and showed the enhancement level obtained by including steel and natural fibers. Following this experimental effort, one of the artificial intelligence techniques (Artificial Neural Network) was applied for simulating and predicting the performance of concrete with different mix proportions. The current paper introduced the Artificial Neural Network (ANN) technique to investigate the effect of natural and steel fibers on the performance of concrete. The results of this study showed that the ANN method with less effort was very efficiently capable of simulating and predicting the performance of concrete with different mix proportions and different types of fibers
Percutaneous Vertebroplasty: A New Serial Injection Technique to Minimize Cement Leak
Hossam Elnoamany 대한척추외과학회 2015 Asian Spine Journal Vol.9 No.6
Study Design: This is a prospective cohort study. Purpose: This study discusses a new technique for injecting cement in the affected vertebrae. Overview of Literature: Since introduction of vertebroplasty to clinical practice, the cement leak is considered the most frequent and hazardous complication. In literature, the cement extravasation occurred in 26%–97% of the cases. Methods: A hundred and twenty-three patients underwent vertebroplasty using the serial injection technique. The package of the cement powder and the solvent was divided into five equal parts. Each part of the powder and the solvent was mixed as a single dose and injected to the affected vertebra. The duration between subsequent injections was 10 minutes. Each injection consisted of 1–1.5 mL of cement. Results: This new technique gives the surgeon enough time to make multiple separate injections using the same package. The time interval between injections hardens the cement just enough so that it does not get displaced by the next cement injection. This technique gives time to the preceding injected cement to seal off the cracks and cavities in the vertebra, and subsequently leads to a significant decrease in cement leak (p <0.001), as compared to literature. Conclusions: This study demonstrates a previously unreported technique for vertebroplasty that adds more safety to the procedure by significantly decreasing cement leak. It also makes the surgeon more relaxed due to time intervals, giving him more self-confidence whilst performing the procedure.
Hossam Elnoamany 대한척추외과학회 2015 Asian Spine Journal Vol.9 No.2
Study Design: This was a prospective cohort study. Purpose: The purpose of this study was to document and evaluate the clinical and radiological results of percutaneous vertebroplasty (PV) as a first line treatment in traumatic non-osteoporotic vertebral compression fractures (TNVCFs). Overview of Literature: PV is commonly used for osteoporotic and neoplastic compression fractures, however its use in traumatic non-osteoporotic compression fractures is uncertain. Methods: We included 23 patients with traumatic non-osteoporotic TNVCFs and normal bone mineral densitometry scores who were treated with PV. Pain was evaluated at 2 hours, 1 week, 1 month, 6 months, 1 year, and 2 years post procedure using the 10-point visual analogue scale (VAS). Ronald-Morris disability Questionnaire (RDQ) scores were also collected. Statistical analysis included a 2-tailed t test comparing postoperative data with preoperative values. Range of mobility was also evaluated. Results: The 23 patients had an average age of 36 years, and 69.5% were female. There was a significant improvement in VAS scores of pain at rest and in motionand in RDQ scores (p <0.05). Conclusions: The results of this study proved that PV can be used successfully as a first line treatment in patients with non-osteoporotic compression fractures. It is also, an effective method to decrease pain, increase mobility, and decrease narcotic administration.