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Search Results: 1 - 10 of 493 matches for " Reda Ramadan "
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Prostate Cancer: Value of Transrectal Computed Ultrasound Tomography (TRCUT) in Targeted Biopsy Guidance when the Repeat or Random Biopsies Indicated: Early Experience
Salah Elwagdy, Reda Ramadan, Tamer Salem, Samy Elhakim, Ismail El Helali and Faten Samir
Clinical Medicine Insights: Urology , 2012, DOI: 10.4137/CMU.S3405
Abstract: Purpose: To evaluate the feasibility of transrectal computed ultrasound tomography (TRCUT) in localization and targeted biopsy for men who have been shown to be negative in the first biopsy guided by two-dimensional transrectal ultrasound (2D TRUS) but continue to have figures suggestive of prostate cancer, so as to minimize with confidence the number of core needle biopsies, especially when the repeat or random required. Materials and Methods: Sixty-three patients aged 53–78 years (mean, 64.9 years) with suspected prostate cancer were enrolled when a repeat or random biopsy was indicated after at least one prostatic biopsy with negative findings. The 2D TRUS random (sextant) and TRCUT guided shot-biopsies were obtained. Imaging-biopsy consequences were finally compared with the post-operative findings and the histopathologic staging. Results: TRCUT enabled display of the prostate gland in planes usually not obtainable at conventional 2D TRUS. Transverse and oblique thin cuts of TRCUT were more significant in all patients than other planes. Diagnostic performance of TRCUT imaging on prostate cancer localization for targeted biopsy proved an accuracy of 97.4% (P value = 0.001). TRCUT for bilateral disease detection proved an accuracy of 78.6% compared to the final post-operative pathology. Accuracy for identification of positive tumor margins proved 82.4%. Gleason score on final post-operative pathology was upgraded to 7, compared with a median score of 6 on imaging biopsies. Conclusion: TRCUT guided target-biopsy of the prostate gland represents a technique with a higher rate of accuracy and can minimize the number of biopsy shots than using 2D TRUS in men who have high PSA levels and negative in the first biopsy procedure.
Flat Panel Solar Thermoelectric System Size Optimisation at Different Vacuum Levels  [PDF]
Kazuz Ramadan
Open Journal of Energy Efficiency (OJEE) , 2015, DOI: 10.4236/ojee.2015.44006

A systematic experimental investigation to understand the effect of heat loss and the thermoelectric aspect ratio (cross sectional area and length) on a flat plate solar thermoelectric system performance was carried out. The investigation involved a series of experiments on systems with 4 different sizes of thermoelectric generators, and it was tested in 5 different vacuum levels during the steady-state. The detailed experimental investigation provided a substantial amount of data, which revealed that the system performance of both heat and electricity power were improved when the heat lost was minimised. The system’s performance strongly depended on the aspect ratio of the thermoelectric generators. This finding might have a significant impact on the cost of the system by saving the user’s and the manufacturer’s time in examining different TEGs with different aspect ratios in order to get the optimum size optimisation of the hybrid system, as well as reduce the manufacturing cost.

Performance Study of a Distributed Web Server: An Analytical Approach  [PDF]
Sarah Tasneem, Reda Ammar
Journal of Software Engineering and Applications (JSEA) , 2012, DOI: 10.4236/jsea.2012.511099
Abstract: With the rapid expansion of the Internet, Web servers have played a major role in accessing the enormous mass of Web pages to find the information needed by the user. Despite the exponential growth of the WWW, a very negligible amount of research has been conducted in Web server performance analysis with a view to improve the time a Web server takes to connect, receive, and analyze a request sent by the client and then sending the answer back to client. In this paper, we propose a multi-layer analytical approach to study the web server performance. A simple client-server model is used to represent the WWW server in order to demonstrate how to apply the proposed approach. We developed a systematic, analytical methodology to quantify the communication delay and queuing overhead in a distributed web server system. The approach uses the Computation Structure Model to derive server processing time required to process a request sent from a client and queueing model to analyze the communication between the clients and the server.
Consumer’s Purchase Intention towards Luxury Retailer’s Social Media Advertisements —A Case Study of a Shoe Retail—UAE-Dubai Mall  [PDF]
Eman Reda Sabri
Social Networking (SN) , 2019, DOI: 10.4236/sn.2019.81003
Digital marketing is considered the preferred method comparing to traditional marketing nowadays [1], but is it true for luxury and expensive products? Since the perception prevails that the concepts “luxury” and “digital” are quite incompatible [2], this paper aims to explore the effectiveness of digital marketing advertisements of luxury retailers, while also exploring consumer’s purchasing intent based on the viewing of such promotions. The overall goal is to provide a model of luxury purchase behaviour through harnessing social media. As a constructionist ontology-based researcher, I believe in multiple versions of reality which can evolve based on my target consumer experiences [3]. My epistemological stance is interpretivism with a subjective approach, inductively interacting with consumers to better understand what this “truth” means to them, incorporating textual material to support the analytical interpretations [4]. It is hoped this paper will inform fashion brands marketers about social media practice to achieve creation of purchase intention and ultimately achieve target sales. The paper is useful to both practitioners and academics in the fields of social media marketing and purchase intention. The research provides some initial insights into consumer perspectives of social media ads and online purchase behaviour.
Observation on Baseline Sensitivity of Erysiphe necator Genetic Groups to Azoxystrobin  [PDF]
Hajaj Ramadan Hajjeh
American Journal of Plant Sciences (AJPS) , 2012, DOI: 10.4236/ajps.2012.311199
Abstract: Powdery mildew, caused by Erysiph necator, is a common and severe fungal disease of grapevine all over the world. The disease costs millions of dollars to vine growers, due to intensive use of fungicides and yield losses. Recently in population of E. necator two genetic groups have been described, the two groups seem to occupy different temporal niches, with a temporal alternation that is clear-cut in vineyards intensively treated with chemical fungicides. QoI-STAR (Quinol Outside Inhibitors-Strobilurin Type of Action and Resistance) fungicides are widely used to control the disease, and generally carry a high risk of pathogen resistance development. To clarify the behaviors of the biotrophic fungus when treated with azoxystrobin as a representative of QoI-STAR, baseline sensitivity of laboratory isolates were determined. A leaf bioassay and the primers RSCBF1 and RSCBR2 designed on the highly conserved regions of cytb gene in fungi were used. Partial sequence of E. necator cytb gene were obtained. Attempts to obtain a laboratory mutant were not totally successful. The sensitivity to azoxystrobin (EC50) in isolates of genetic group B was significantly higher than in isolates of group A, to which all the isolates collected later in the season belonged. The higher sensitivity to azoxystrobin fungicides observed in group B isolates can be at the basis of their precocious disappearance in vineyards, and can have important implications for powdery mildew control strategies.
A Study on Developing the Role of Human Resource Information Systems for Good Leadership  [PDF]
Harini Methuku, Hatim Ramadan
American Journal of Industrial and Business Management (AJIBM) , 2013, DOI: 10.4236/ajibm.2013.35057

The research is a human and context oriented study in the field of information systems (IS), human resource information systems (HRIS), leadership, human resource management (HRM) and tacit knowledge are focused in the study. HRIS and leadership are two main concepts of the research, whereas HRM provides an application area and managerial activities of leadership for HRIS. Tacit knowledge is used to describe and interpret actions that make leadership activities, sensitive and successful. The theoretical framework consists of when thinking and acting in the current way, what kind of information systems it produces, and when thinking and acting in another way, what kind of information systems it creates. The framework has its base on thinking and acting in a conventional, routine and stereotyped way, which hinders the process of observing, finding out, applying and using alternative thoughts and actions although they might provide useful and innovative solutions or activities for IS design. The main idea is to understand, interpret and to describe the phenomenon of the activities of good leadership and the phenomenon of the role of HRIS in the case organizations.

On Mutually Orthogonal Graph-Path Squares  [PDF]
Ramadan El-Shanawany
Open Journal of Discrete Mathematics (OJDM) , 2016, DOI: 10.4236/ojdm.2016.61002

A decomposition \"\" of a graph H is a partition of the edge set of H into edge-disjoint subgraphs \"\". If \"\" for all \"\", then G is a decomposition of H by G. Two decompositions \"\" and \"\" of the complete bipartite graph \"\" are orthogonal if, \"\"for all \"\". A set of decompositions \"\"of \"\" is a set of k mutually orthogonal graph squares (MOGS) if \"\" and \"\" are orthogonal for all \"\" and \"\". For any bipartite graph G with n edges, \"\"denotes the maximum number k in a largest possible set \"\" of MOGS of \"\" by G. Our objective in this paper is to compute \"\" where \"\" is a path of length d with

Electroslag Remelting of High Technological Steels  [PDF]
Hossam Halfa, A. M. Reda
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2015, DOI: 10.4236/jmmce.2015.36047
Abstract: This work aims at the suitability of electroslag process on production of high technological steels such as Maraging steel, modified high speed tool steel (niobium, high nitrogen, and free nitrogen) has been investigated. The experimental results show that high recovery of alloying elements during electroslag remelting of such steels especially high nitrogen tool steel. The previous results are attributed to the slag used in electroslag protect the molten metal from atmospheric oxygen. Also higher recovery of alloying elements during remelting high nitrogen high speed tool steel are due to partial dissolution of nitrides during remelting of such steel which increase nitrogen content above the molten slag which decrease the partial pressure of oxygen leads to protection of molten metal from further oxidation. Also, the results show that, produced ingots are free from internal pipes, porosity and other surface defects. Microstructure obtained for remelted steels is very fine and well distributed for all steel under investigation. In the case of electroslag remelted Maraging steels lower non-metallic inclusions with very fine inclusions and redistribution retained austenite with very fine structure leads to increasing all tensile properties of investigated steels. In the case of high speed tool steels, also the structure is very fine, well distributed, densely and short carbides with lower non-metallic inclusions contents. High cooling rate accompanying with electroslag process has a great effect on type, morphology and content of carbides precipitated in both nitrogen and niobium modified tool steels.
Unusual Catalytic Process Involving OH and NH Exchange  [PDF]
Ramadan M. Ramadan, Ahmad K. Abu Al-Nasr
International Journal of Organic Chemistry (IJOC) , 2012, DOI: 10.4236/ijoc.2012.21011
Abstract: Interaction of some transition metals species with a Schiff base, 1, derived from 4,6-diacetylresorcinol and 2-amino- 5-methylphenol (1:2 mole ratio) yielded the two compounds 4-ethanimidoyl-6-[(1E)-N-(2-hydroxy-4-methylphenyl) ethanimidoyl]benzene-1,3-diol, 2, and 4,6-diacetyl-1,3-diaminobenzene, 4 via unusual catalytic process involving OH and NH exchange. All the compounds are characterized by elemental analysis, IR, mass and 1H NMR. The structure of the two compounds 2 and 4 are also determined by X-ray analysis. The crystal structure analysis revealed that the two compounds crystallized in the monoclinic space group P21/c with a Z value of 4.
Are the Criteria for Health and Safety Available in Adjustable Saudi School Furniture?  [PDF]
Khalid Al Saleh, Mohamed Ramadan
iBusiness (IB) , 2011, DOI: 10.4236/ib.2011.32027
Abstract: This research investigated the effect of adjustable Saudi chair-table combinations available in the local market on the students' health and safety. Thirty seven young students participated in this research. Ten chair-table combinations, within three different activities (reading, writing, and looking at the blackboard), were the independent variables. Normalized discomfort ratings, and neck dorsal and upper trapezius muscular activities were the dependent variables. Variances among students' body dimensions and classroom furniture were also studied. There were higher levels of neck dorsal and upper trapezius muscular contractions associated with less dimensions of chair-table combinations compared to high dimensions of chair-table combinations. Normalized discomfort ratings at the neck, shoulder, thigh, and feet were significantly higher at high chair-table dimensions. Matched school furniture to the student dimensions was associated with low dimensions of chair-table combinations. The suitability of the local adjustable chair-table combination was not fit to the students’ health. Saudi furniture industry should review and provide the local schools with the most appropriate furniture to Saudi students’ anthropometric dimensions.
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