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Search Results: 1 - 10 of 161500 matches for " Al-Jassir Fawzi F "
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In vitro assessment of Function Graded (FG) artificial Hip joint stem in terms of bone/cement stresses: 3D Finite Element (FE) study
Al-Jassir Fawzi F,Fouad H,Alothman Othaman Y
BioMedical Engineering OnLine , 2013, DOI: 10.1186/1475-925x-12-5
Abstract: Background Stress shielding in the cemented hip prosthesis occurs due to the mismatching in the mechanical properties of metallic stem and bone. This mismatching in properties is considered as one of the main reasons for implant loosening. Therefore, a new stem material in orthopedic surgery is still required. In the present study, 3D finite element modeling is used for evaluating the artificial hip joint stem that is made of Function Graded (FG) material in terms of joint stress distributions and stem length. Method 3D finite element models of different stems made of two types of FG materials and traditional stems made of Cobalt Chromium alloy (CoCrMo) and Titanium alloy (Ti) were developed using the ANSYS Code. The effects on the total artificial hip joint stresses (Shear stress and Von Mises stresses at bone cement, Von Mises stresses at bone and stem) due to using the proposed FG materials stems were investigated. The effects on the total artificial hip joint system stresses due to using different stem lengths were investigated. Results Using FG stem (with low stiffness at stem distal end and high stiffness at its proximal end) resulted in a significant reduction in shear stress at the bone cement/stem interface. Also, the Von Mises stresses at the bone cement and stem decrease significantly when using FG material instead of CoCrMo and Ti alloy. The stresses’ distribution along the bone cement length when using FG material was found to be more uniform along the whole bone cement compared with other stem materials. These more uniform stresses will help in the reduction of the artificial hip joint loosening rate and improve its short and long term performance. Conclusion FE results showed that using FG stem increases the resultant stresses at the femur bone (reduces stress shielding) compared to metallic stem. The results showed that the stem length has significant effects on the resultant shear and Von Mises stresses at bone, stem and bone cement for all types of stem materials.
Design and Operation of Small-Scale Photovoltaic-Driven Reverse Osmosis (PV-RO) Desalination Plant for Water Supply in Rural Areas  [PDF]
Fawzi Banat, Hazim Qiblawey, Qais Al- Nasser
Computational Water, Energy, and Environmental Engineering (CWEEE) , 2012, DOI: 10.4236/cweee.2012.13004

The alarming water and energy crisis in many regions of the world can be eased by combining renewable energy with desalination technologies. The ADIRA project funded by the EU looked for demonstrating the feasibility of water desalination in areas around the Mediterranean by installing a number of autonomous desalination systems (ADS) which are able to convert brackish or seawater into potable water for the needs of small communities. Within the activities of the ADIRA project a reverse osmosis unit powered by photovoltaic electricity was installed in a village in the northern part of Jordan with a capacity of 0.5 m3/day. The system was composed of a softener, reverse osmosis unit, PV panels (432 Wp) and storage batteries. Residential type OSMONICS membrane (TFM-100) was utilized in the RO unit. Field tests were performed on brackish water (1700 mg/L total dissolved solids (TDS)). This paper sheds the light on the process flow diagram, sizing of the system main components and presents some of the results obtained.

Isolation and Characterization of Bacteriophages from Laban Jameed  [PDF]
Murad Mohammad Ishnaiwer, Fawzi Al-Razem
Food and Nutrition Sciences (FNS) , 2013, DOI: 10.4236/fns.2013.411A008

Laban jameed is a dried salty dairy product obtained by fermentation of milk using a complex population of lactic acid bacteria. Jameed is considered a traditional food product in most eastern Mediterranean countries and is usually made from sheep or cow milk. The aim of this study was to assess phage contamination of jameed dairy product. Two phages were isolated: one from sheep milk jameed (PPUDV) and the other from cow milk jameed (PPURV). Each of the two bacteriophages was partially characterized. The PPUDV phage was identified as a single stranded DNA virus with an approximately 20 kb genome that was resistant to RNase, whereas PPURV phage possessed a double stranded RNA genome of approximately 20 kb and was resistant to DNase. The phage bacterial strain hosts were identified as Lactobacillus helveticus and Bacillus amyloliquefaciens for PPUDV and PPURV, respectively. One step growth curve using a double layer plaque assay test was carried out to monitor the phage life cycle after host infection. PPUDV showed a latent period of about 36 h, burst period of 70 h and a burst size of about 600 Plaque Forming Units (PFU) per infected cell. PPURV phage showed a latent period of about 24 h, burst period of 47 h and a burst size of about 700 PFU per infected cell. SDS-PAGE analysis of total viral proteins showed at least three major bands (27, 40, and 45 kDa) for PPUDV. This is the first study to report the isolation of both DNA and RNA bacteriophages from laban jameed. This study adds new insights into the complexity of dairy contamination and fermentation microbiology of the jameed revealing the existence of two viral genomes in this highly dried and salty dairy product.

RU28318, an Aldosterone Antagonist, in Combination with an ACE Inhibitor and Angiotensin Receptor Blocker Attenuates Cardiac Dysfunction in Diabetes
Ibrahim F. Benter,Fawzi Babiker,Ibrahim Al-Rashdan,Mariam Yousif,Saghir Akhtar
Journal of Diabetes Research , 2013, DOI: 10.1155/2013/427693
Abstract: Aims. We evaluated the effects of RU28318 (RU), a selective mineralocorticoid receptor (MR) antagonist, Captopril (Capt), an angiotensin converting enzyme inhibitor, and Losartan (Los), an angiotensin receptor blocker, alone or in combination with ischemia/reperfusion- (I/R-) induced cardiac dysfunction in hearts obtained from normal and diabetic rats. Methods. Isolated hearts were perfused for 30 min and then subjected to 30 min of global ischemia (I) followed by a period of 30 min of reperfusion (R). Drugs were administered for 30 min either before or after ischemia. Drug regimens tested were RU, Capt, Los, RU + Capt, RU + Los, Capt + Los, and RU + Capt + Los (Triple). Recovery of cardiac hemodynamics was evaluated. Results. Recovery of cardiac function was up to 5-fold worse in hearts obtained from diabetic animals compared to controls. Treatment with RU was generally better in preventing or reversing ischemia-induced cardiac dysfunction in normal hearts compared to treatment with Capt or Los alone. In diabetic hearts, RU was generally similarly effective as Capt or Los treatment. Conclusions. RU treatment locally might be considered as an effective therapy or preventative measure in cardiac I/R injury. Importantly, RU was the most effective at improving (a measure of diastolic function) when administered to diabetic hearts after ischemia. 1. Introduction In addition to the circulatory renin-angiotensin-aldosterone system (RAAS), there is now a significant body of evidence supporting the concept of a “local tissue or cellular RAAS” that has important roles in the pathology of cardiovascular diseases [1]. The local production of aldosterone and the discovery of mineralocorticoid receptor (MR) expression in the heart have led to a greater understanding of the role of aldosterone/mineralocorticoid receptor activation in the cardiovascular diseases, including hypertension and heart failure [2, 3]. Aldosterone activates its mineralocorticoid receptor (MR) in the nondiabetic heart and can cause structural and electrical remodelling, fibrosis, oxidative stress, inflammation, and arrhythmias [1, 4–7]. MR antagonists have shown significant benefit in patients with left ventricular dysfunction and myocardial infarction [8]. For example, the recent Eplerenone in Mild Patients Hospitalization And Survival Study in Heart Failure (EMPHASIS-HF) study has shown that eplerenone, an MR antagonist, has beneficial effects in patients with moderate heart failure (NYHA class II) [9]. However, beneficial effects of MR blockade in pathological states such as diabetes are
Other Corporate Information Sources Usage: Evidence from Jordanian Individual Investors
Fawzi Al Sawalqa
International Business Research , 2012, DOI: 10.5539/ibr.v5n4p81
Abstract: This study aims to provide insight into of the extent of usage of other corporate financial information sources by Jordanian individual investors in taking their investment decisions in Amman Stock Exchange (ASE) in comparison with annual corporate reports. The study also aims to identify the main reasons for using sources of information other than corporate annual reports. The result of study revealed that corporate annual report was the most used sources of information. This followed by published daily share price, newspapers and magazines, corporate web sites, advice of friend, tips and rumours, stockbrokers’ advice and discussion with company staff respectively. These results indicated that Jordanian individual investors put more emphasis on the usage of the written sources than verbal sources. The results also indicated that Jordanian individual investors start to give more attention to the usage of electronic sources as the corporate web sites ranked forth. In respect to reasons that encouraged investors to use sources of information other than corporate annual reports, the results indicated that the first three reasons include; easier to get information, containing new information and giving up-to-date information. These reasons form the features of the written sources which were indicated as the most used sources of information.
Different Sources of Corporate Financial Information and Investment Decision Opportunity: Evidence from Amman Stock Exchange
Fawzi Al Sawalqa
International Journal of Business and Management , 2012, DOI: 10.5539/ijbm.v7n7p110
Abstract: This study was designed to examine the importance of different corporate financial information sources in investment decision-making. To achieve this objective, 94 Jordanian individual investors were surveyed. The result of study indicated that Jordanian individual investors ranked corporate annual reports as the most important source of information for the purpose of their investment decision-making. This followed by the published daily share prices, corporate web sites, newspapers and magazines, advice of friends, discussion with company staff, stockbrokers’ advice and tips and rumours respectively. Thus, the findings of study revealed that Jordanian individual investors place more emphasis on the usage of written information rather than verbal information for the purpose of investment decision-making. The results also indicated that the usage of corporate annual report and the discussion with company staff contribute significantly towards a good investment opportunity. This indicated that Jordanian individual investors were very careful in their investment decision-making process in that they prefer to depend on those sources that issued by the intended companies.
Steady Rheological Properties of Rotating Biological Contactor (RBC) Sludge  [PDF]
Journal of Water Resource and Protection (JWARP) , 2010, DOI: 10.4236/jwarp.2010.21001
Abstract: The rheological characterization of sewage sludge at different steps of wastewater treatment is important since it allows predicting and estimating sludge behavior when submitted to almost all treatment and disposal operations. Rotating biological contactor (RBC) is being widely used for wastewater treatment, which is a biological treatment process following primary treatment. The rheological characterization of RBC sludge at different solid contents (TSS = 32.2 g/L–50.2 g/L) and temperatures (5–40 °C) was carried out using a rotational viscometer. The RBC sludge showed a shear-thinning behavior, where the apparent viscosity decreased rapidly with the shear rate reaching the limiting viscosity (n) at the infinite shear rate. An exponential relationship described the evolution of the limiting viscosity with the sludge TSS content. In addition, a dramatic increase in the limiting viscosity beyond a TSS concentration of 42.4 g/L has been observed. On the other hand, Bingham model described well the non-Newtonian behavior of sludge suspensions. It was clear that the yield stress is more sensitive than the Bingham viscosity for the variation in temperature and solid content. However, the rheological results revealed that both the limiting and Bingham viscosities have the same behavior with the TSS content and with the temperature.
An Internet Based Distributed Control Systems: A Case Study of Oil Refineries  [PDF]
Musaria K. Mahmood, Fawzi M. Al-Naima
Energy and Power Engineering (EPE) , 2011, DOI: 10.4236/epe.2011.33038
Abstract: An Internet based Distributed Control System (DCS) is presented in this paper for monitoring real time data using ordinary web browser. Each DCS will be connected to the central server which will be the system web server. The proposed system is based on the three-tier client-server model. The application server is written in C#.Net. SQL database server 2005 is used for all the DCSs local database servers and for the system database server. Monitoring real time system alarm and all historical records are considered as part of the proposed system. The North Oil Refineries of Baiji (NORB) in northern Iraq is considered as a case study for the developed system. These refineries have twelve independent DCSs which are connected in a mesh network to form one system similar to an ordinary Supervisory Control And Data Acquisition (SCADA) system.
Developing a Multi-Layer Strategy for Securing Control Systems of Oil Refineries  [PDF]
Musaria K. Mahmood, Fawzi M. Al-Naima
Wireless Sensor Network (WSN) , 2010, DOI: 10.4236/wsn.2010.27064
Abstract: The energy industry and in particular the Oil Refineries are extremely important elements in Iraq’s infrastructure. A terrorist attack on one oil refinery will have a catastrophic impact on oil production and the whole economy. It can also cause serious damage to the environment and even losses of human lives. The security of information systems and industrial control systems such as Supervisory Control and Data Acquisition (SCADA) systems and Distributed Control System (DCS) used in the oil industry is a major part of infrastructure protection strategy. This paper describes an attempt to use several security procedures to design a secure, robust system for the SCADA and DCS systems currently in use in the North Oil Refinery in the city of Baiji located in northern Iraq.
Giant Cell Tumor of Lumbar Spine Treated with RapidArc Intensity Modulated Arc Therapy: Case Report and Review of Literature  [PDF]
Eyad Fawzi Al Saeed, Mutahir A. Tunio, Stanciu Laura Gabriela
Journal of Cancer Therapy (JCT) , 2014, DOI: 10.4236/jct.2014.56070

Background: Giant cell tumors of the lumbar spine are rare and complete resection without major functional comprise is challenging despite advancements in spine surgery techniques. Radiation therapy has been an option in such cases; however there are high concerns for associated high small bowel toxicity and lack of dose escalation to achieve local control. With advent of intensity modulated radiation therapy (IMRT) it is now possible to give high radiation dose to tumor with minimal toxicity. Herein we present a rare case of giant cell tumor of fourth lumbar (L4) vertebra treated with RapidArc intensity modulated arc therapy (IMAT) with relevant review of literature. Methods: A 30-year-old female had low back pain for 6 months. She underwent surgical decompression at another hospital as having a L4-5 protruded intervertebral disc 2 months previously, but her back pain progressed with weakness of both legs with restricted movement. Radiological and pathological work-up confirmed the diagnosis of giant cell tumor of L4 vertebra. She refused further surgery and was referred to us for radiotherapy. Treatment plans for prescribed radiation dose of 59.4 Gy in 30 fractions were made by 3DCRT and RapidArc IMAT and comparison was made. Student’s unpaired t test was used to determine the significance of the difference between two plans in terms of dose to the tumor and small bowel. A p value of 0.05 was considered statistically significant. Related literature was searched. Results: In RapidArc IMAT and 3DCRT plans mean doses to planning treatment volume (PTV) were 61.24 Gy (55.98 - 66.23) and 60.71 Gy (49.87 - 63.74) respectively (p 0.04) and mean doses to small bowel were found lesser in RapidArc plan [14.78 Gy (range: 0.39 - 53.15)] as compared to 3DCRT plan. Patient was started on RapidArc IMRT and she completed the course without any major sequelae. Conclusion: Lumbar spine giant cell tumors are rare and complete resection is often not possible. RapidArc IMAT is a feasible option for such patients to deliver high dose radiation to achieve good local control with marked symptom relief and without severe toxicity.

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