Tanta University is an Egyptian university in the city of Tanta, Al Gharbiyah governorate, Egypt. The university is under the direct scientific supervision of the Ministry of Higher Education.It was founded first in 1962 as a branch from the University of Alexandria with the faculty of Medicine only and then it became an independent university named University of the Middle Delta in 1972. It had at that time Medicine, Science, Agriculture and Education faculties. Then, its name was changed into Tanta University in 1973. Wikipedia.
Ellobody E.,Tanta University
Journal of Constructional Steel Research | Year: 2011
This paper investigates the behaviour of normal and high strength castellated steel beams under combined lateral torsional and distortional buckling modes. An efficient nonlinear 3D finite element model has been developed for the analysis of the beams. The initial geometric imperfection and material nonlinearities were carefully considered in the analysis. The nonlinear finite element model was verified against tests on castellated beams having different lengths and different cross-sections. Failure loads and interaction of buckling modes as well as loadlateral deflection curves of castellated steel beams were investigated in this study. An extensive parametric study was carried out using the finite element model to study the effects of the change in cross-section geometries, beam length and steel strength on the strength and buckling behaviour of castellated steel beams. The parametric study has shown that the presence of web distortional buckling causes a considerable decrease in the failure load of slender castellated steel beams. It is also shown that the use of high strength steel offers a considerable increase in the failure loads of less slender castellated steel beams. The failure loads predicted from the finite element model were compared with that predicted from Australian Standards for steel beams under lateral torsional buckling. It is shown that the Specification predictions are generally conservative for normal strength castellated steel beams failing by lateral torsional buckling, unconservative for castellated steel beams failing by web distortional buckling and quite conservative for high strength castellated steel beams failing by lateral torsional buckling. © 2011 Elsevier Ltd. All rights reserved.
Bassuoni M.M.,Tanta University
Energy | Year: 2011
The present work presents an experimental investigation on the performance of the structured packing cross flow desiccant dehumidification system (DDS). This system is referred as DDS; its heart is the dehumidifier/regenerator. It is used to meet a latent heat load by air dehumidification. Calcium chloride (CaCl2) solution is used as the working desiccant material in this system. The structured packing has a density (specific surface area) of 390m2/m3, corrugation angle of 60° and void fraction of 0.88. The effect of relevant parameters such as air flow rate, desiccant solution flow rate, desiccant solution temperature and concentration and packing thickness on the performance of the system is studied. The performance of the system is evaluated using the mass transfer coefficient, moisture removal rate (MMR), effectiveness and the coefficient of performance (COP). The remarkable increase of mass transfer coefficient and MRR for both deh/reg is observed by increasing both air and solution flow rates. Eventually, the payback period (PP) of the DDS is 11 months with annual running cost savings (ΔCRC) of about 31.24% compared with vapor compression system (VCS) dehumidification. The overall environmental impacts of DDS are nearly 0.63 of VCS. This may emphasize the need of incorporating a desiccant system along with air conditioning applications. © 2011 Elsevier Ltd.
El-Agouz S.A.,Tanta University
Energy Conversion and Management | Year: 2014
This paper presents a modification of stepped solar still with continuous water circulation using a storage tank for sea and salt water. Total dissolved solids (TDS) of seawater and salt water before desalination is 57,100 and 2370 mg/l. A comparison study between modified stepped and conventional solar still was carried out to evaluate the developed desalination system performance under the same climate conditions. The effect of installing a storage tank and cotton black absorber for modified stepped solar still on the distillate productivity was investigated. The results indicate that, the productivity of the modified stepped still is higher than that for conventional still approximately by 43% and 48% for sea and salt water with black absorber respectively, while 53% and 47% of sea and salt water, respectively with cotton absorber. Also, the daily efficiency for modified stepped still is higher than that for conventional still approximately by 20%. The maximum efficiency of modified stepped still is occurring at a feed water flow rate of 1 LPM for sea water and 3 LPM for salt water. Total dissolved solids (TDS) of seawater and salt water after desalination is 41, and 27 mg/l. © 2014 Elsevier Ltd. All rights reserved.
Ellobody E.,Tanta University
Thin-Walled Structures | Year: 2013
This paper presents a consistent nonlinear 3-D finite element approach, adopted by the author over the last ten years, for analysing steel, cold-formed steel, stainless steel and composite columns at ambient and fire conditions. The main parameters affecting the finite element approach, which has accounted for the nonlinear material properties of the column cross-sections at ambient and elevated temperatures, initial local and overall geometric imperfections and residual stresses, are highlighted in this paper. The finite element approach could be easily extended to study columns constructed from other materials or built-up using different sections. This paper also presents up-to-date review for previously published experimental and numerical investigations highlighting the stability of the aforementioned columns at ambient and elevated temperatures. In addition, the paper highlights the design rules specified in current codes of practice for the columns. Furthermore, this paper presents, as examples, comparisons of finite element analysis results, previously reported by the author, with design values calculated using of current codes of practice. In overall, the paper aims to stress the fact that consistent, robust and efficient nonlinear 3-D finite element models could improve and assess the accuracy of design rules specified in current codes of practice at ambient and elevated temperatures. Also, better understanding of the structural performance of the columns in the cold condition is essential to analyse the column behaviour under severe fire conditions. © 2013 Elsevier Ltd.
Othman A.A.,Tanta University
Acta Tropica | Year: 2012
Toxocariasis is a widespread zoonotic helminthic disease. Human infection is acquired by ingestion of embryonated eggs of Toxocara which reach the environment via stools of dogs and cats. In paratenic hosts, such as humans and mice, the hatched larvae migrate systematically in the body and could reach critical sites such as the eye and the central nervous system. The clinical expression of toxocariasis includes two main forms of varying intensity: visceral and ocular, as well as several organ-specific clinical manifestations. The issue of treatment is a matter of great controversy not only because of limited efficacy of anthelmintic drugs in terms of parasite eradication, but also because of doubts about the benefits of therapy as most Toxocara infections are self-limiting. Many animal studies were conducted employing different drugs and regimens, yet the results were variable and inconsistent. On the other hand, experience in human therapy is unfortunately limited due to paucity of clinical trials. Herein, the problems and pitfalls of treatment of toxocariasis are addressed, and new trends in therapy are discussed. © 2012 Elsevier B.V.
Ibrahim A.,Tanta University
Renewable and Sustainable Energy Reviews | Year: 2012
This review paper presents an appraisal of renewable energy RE options in Egypt. An appraisal review of different REs is presented. The study shows that electric energy produced from REs in Egypt are very poor compared with other energy sources. The utilization of the renewable energies can also be a good opportunity to fight the desertification and dryness in Egypt which is about 60% of Egypt territory. The rapid growth of energy production and consumption is strongly affecting and being affected by the Egyptian economy in many aspects. It is evident that energy will continue to play an important role in the development of Egypt's economy in coming years. The total installed electricity generating capacity had reached around 22025 MW with a generating capacity reached 22605 MW at the end of 2007. Hydropower and coal has no significant potential increase. During the period 1981/82-2004/05 electricity generation has increased by 500% from nearly 22 TWh for the year 1981/1982 to 108.4 TWh in the year 2004/2005 at an average annual growth rate of 6.9%. Consequently, oil and gas consumed by the electricity sector has jumped during the same period from around 3.7 MTOE to nearly 21 MTOE. The planned installed capacity for the year 2011/2012 is 28813 MW and the required fuel (oil and gas) for the electricity sector is estimated to reach about 29 MTOE by the same year. The renewable energy strategy targets to supply 3% of the electricity production from renewable resources by the year 2010. Electrical Coverage Electrical energy has been provided for around 99.3% of Egypt's population, representing a positive sign for the welfare of the Egyptian citizen due to electricity relation to all development components in all walks of life. The article discusses perspectives of wind energy in Egypt with projections to generate ∼ 3.5 GWe by 2022, representing ∼9% of the total installed power at that time (40.2 GW). Total renewables (hydro + wind + solar) are expected to provide ∼7.4 GWe by 2022 representing ∼ 19% of the total installed power. Such a share would reduce dependence on depleting oil and gas resources, and hence improve country's sustainable development. © 2011 Elsevier Ltd. All rights reserved.
Amr Y.M.,Tanta University
Pain Physician | Year: 2011
Background: Treating sciatica with epidural steroid injection has been a common practice worldwide. N-methyl-D-aspartate (NMDA) receptors are an important component of pain pathways. Objectives: The aim of this study was to evaluate the safety and efficacy of epidurally administered NMDA receptor antagonists (ketamine) for the treatment of chronic low back pain secondary to radiculopathy and its effect on patients' quality of life. Study Design: Randomized, double blind controlled trial. Setting: Hospital outpatient setting. Methods: Two hundred participants aged 25 to 50 years old with a diagnosis of lumbar radiculopathic pain secondary to disc herniation were randomized into 2 equal groups. Group I received 80 mg of triamcinolone (2 mL) and 0.25% bupivacaine (3 mL) plus 30 mg (3 mL) of preservative free ketamine. Group II received 80 mg of triamcinolone (2 mL) and 0.25% bupivacaine (3 mL) plus 3 mL of 0.9% saline. Pain scores were obtained before injection, immediately after injection, one week, one month, 3 months, 6 months, 9 months and one year post injection. The Oswestry Low Back Pain Disability Questionnaire was used at baseline and at one month, 3, 6, 9, and 12 months after injection for assessment of quality of life. Patients were asked to report any side effects, particularly those related to ketamine, including nausea, vomiting, visual or auditory hallucinations, and delirium. Results: Immediately after injection there was no statistically significant difference between Group I and II regarding pain scale scores. After one week of injection, pain relief was significantly better in Group I compared to Group II and then at all evaluation times. The Oswestry Low Back Pain Disability Questionnaire score decreased significantly (P < 0.05) from 72 (range 62- 83) and 70 (range 57- 82) to 8 (range 2 - 12) and 17 (range 9 - 27) at one month; 6 (range 4 - 12) and 18 (range 14 - 22) at 3 months; 12 (range 9 - 16) and 28 (range 22 - 34) at 6 months; 17 (range 9 - 24) and 31 (range 21 - 35) at 9 months; and 17 (range 8 - 22) and 33 (range 20 - 37) at 12 months in the groups, respectively. Six patients in the ketamine group showed short-lasting delusions lasting for 45 ± 12 minutes after injection. Limitations: The limitations include a lack of placebo control. Conclusion: Epidurally administrated ketamine seems to be a safe and useful adjunct to epidural corticosteroid therapy in chronic lumbar radicular pain.
Abdullah A.S.,Tanta University
Desalination | Year: 2013
In this paper, the experimental performance of a stepped solar still coupled with a solar air-heater was investigated. A single slope passive solar still (conventional still) and stepped active solar still integrated with a solar air-heater collector were fabricated with an area of 0.5m2. The hot air from the solar air heater passes under the base of stepped still used to heat the saline water. The higher saline water temperature was achieved by the active stepped solar still compared to the passive solar still due to the additional thermal energy supplied by hot air. Use of aluminum filling as thermal storage material beneath the absorber plate keeps the operating temperature of the still high enough to produce distillated water during the lack of sunshine, particularly at night. Also, the effect of water flow over the glass cover was studied. Results showed that, water productivity increased by 112% over conventional still, when the system was coupled with a solar air-heater and glass cover cooling, for stepped solar still. The productivity of the stepped still is increased by integrating aluminum filling by about 53% over conventional still. The experimental study including the comparison between the conventional still and stepped still with improvement The hot air passes under the base of stepped still used to heat the saline water Use of aluminum filling as thermal storage material beneath the absorber plate The effect of water flow over the glass cover was studied. The productivity of stepped still with improvement increased above 120% over conventional still. © 2013 Elsevier B.V.
Ellobody E.,Tanta University
Thin-Walled Structures | Year: 2012
This paper discusses the nonlinear analysis of normal and high strength cellular steel beams under combined buckling modes. A nonlinear 3-D finite element model has been developed, which accounted for the initial geometric imperfection, residual stresses and material nonlinearities of flange and web portions of cellular steel beams. The nonlinear finite element model was verified against tests on cellular steel beams having different lengths, different cross-sections, different loading conditions and different failure modes. Failure loads, loadmid-span deflection relationships and failure modes of cellular steel beams were predicted from the finite element analysis. An extensive parametric study involving one hundred and twenty cellular steel beams was performed using the verified finite element model to study the effects of the change in cross-section geometries, beam length and steel strength on the strength and buckling behaviour of cellular steel beams. The results of the parametric study has shown that cellular steel beams failing due to combined web distortional and web-post buckling modes exhibited a considerable decrease in the failure loads. It is also shown that the use of high strength steel offers a considerable increase in the failure loads of less slender cellular steel beams. The failure loads predicted from the finite element model were compared with that predicted from Australian Standards for steel beams under lateral torsional buckling. It is shown that the Specification predictions are generally conservative for normal strength cellular steel beams failing by lateral torsional buckling, unconservative for cellular steel beams failing by combined web distortional and web-post buckling and quite conservative for high strength cellular steel beams failing by lateral torsional buckling. © 2011 Elsevier Ltd. All rights reserved.
Amr Y.M.,Tanta University
Pain Physician | Year: 2010
Background: Severe, intractable, chronic pain is a significant management problem for those involved in the long-term care of spinal cord injury (SCI) patients. Gabapentin, an anticonvulsant, is widely used for treating chronic pain. Ketamine, an NMDA receptor antagonist, has been available in clinical practice for 35 years. Its usefulness in pathological pain states is known. Despite this, no formal research on its effectiveness in treating neuropathic SCI pain exists. Objectives: This double-blind study sought to determine the safety and efficacy of adding a multi-day low dose ketamine infusion to oral gabapentin for treating chronic pain related to post spinal cord injury. Study Design: Randomized, controlled, double blind trial Setting: Hospital, in-patient setting. Methods: Forty patients diagnosed with neuropathic pain secondary to spinal cord injury were randomized into 2 equal groups. Group I received an 80 mg intravenous ketamine infusion diluted in 500 cc normal saline over a 5 hour period daily for one week and 300 mg of gabapentin 3 times daily. Group II received a placebo infusion and 300 mg of gabapentin 3 times daily (continued) after 300 mg of gabapentin 3 times daily. Using the visual analogue scale, pain was assessed prior to treatment, daily following ketamine or placebo infusions for 7 days, and then weekly for one month after infusion termination. Side effects, specifically those related to ketamine or gabapentin, were reported. Results: Both groups demonstrated significantly reduced pain scores compared with pretreatment values (P < 0.05). Group I showed significant pain score improvements over Group II at all measurements (P < 0.0001) during infusion and 2 weeks after infusion termination. There was no statistical difference between the groups at 3 weeks and 4 weeks after infusion termination (P = 0.54 and P = 0.25 respectively). Both drugs were tolerated by all patients; no side effects required intervention. Conclusion: Multi-day low dose ketamine infusion as adjuvant to gabapentin in post-spinal cord injury related chronic pain is safe and efficacious in reducing pain, but the effect compared to placebo ceased 2 weeks after infusion termination. Limitations: Study size limited to 40 patients.