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Search Results: 1 - 10 of 462013 matches for " Rabih A. Jabr "
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An Extended Conic Quadratic Program for Load Flow Control
Rabih A. Jabr
Elektrika : Journal of Electrical Engineering , 2008,
Abstract: Power flow solutions form the basis for computer-based steady-state network operation and planning. In modern power networks, accurate power flow computations need to account for models of controllable devices such as tap-changing transformers, phase shifters, and unified power flow controllers. This paper presents a new load flow control optimisation framework based on an extension of the conic quadratic programming format. Its objective is to minimise the L1-norm of deviations from prescribed control target values and thus produces feasible solutions even for non-attainable targets. In the proposed framework, the classical non-linear power flow equations are transformed into linear constraints. The nonlinearity which is inherent in the power flow model is transformed into a set of conic quadratic and arctangent functional equalities. This results in a load flow control model that is amenable to straightforward integration in efficient primal-dual interior-point methodologies. Moreover, the linearity of the power flow equations allows the use of scaling techniques for improving the numerical conditioning of the problem. The performance of the proposed method is validated by comparing with previously published Newton-Raphson based power flow results. Computations on a 2383-bus test system are also reported.
Manejo de la infección por el VHC en la enfermedad renal crónica
Aoufi Rabih,S.; García Agudo,R.;
Nefrología (Madrid) , 2011,
Abstract: the prevalence of chronic infection with the hepatitis c virus (hcv) in patients with chronic kidney disease is higher than in the general population. the estimated prevalence is 13% in haemodialysis, with wide variations geographically and between units in the same country. a liver biopsy is a useful tool for deciding whether to start antiviral therapy and to exclude concomitant causes of liver dysfunction. examples of this include nonalcoholic fatty liver disease, whose incidence is on the rise, and haemosiderosis, which may affect the progression of the disease and determine the response to antiviral therapy. in addition, the transjugular approach can be used to measure the hepatic venous pressure gradient and confirm the existence of portal hypertension. chronic hepatitis due to hcv has been shown to reduce survival in haemodialysis, renal transplantation and graft survival. it is the fourth leading cause of death and the leading cause of post-renal transplantation liver dysfunction. hcv behaves as an independent risk factor for the occurrence of proteinuria; it increases the risk of developing diabetes mellitus, de novo glomerulonephritis and chronic allograft nephropathy; it leads to a deterioration in liver disease and causes a greater number of infections. an increased frequency of fibrosing cholestatic hepatitis has also been described which, together with the rapid evolution to cirrhosis, can significantly increase morbidity and mortality and lead to the need for liver transplantation. in addition, immunosuppression in renal transplantation predisposes a reactivation of hcv. however, as the pharmacokinetics of interferon and ribavirin is impaired in kidney failure and their use has adverse effects on function and graft survival, a combination therapy must be limited to non-transplanted individuals with an estimated glomerular filtration rate greater than 50ml/min, and with the interferon being used as monotherapy in dialysis. the fact that a quarter of hcv
Stylistic Awareness to Analyze and Comprehend Authentic Discourse in Language Classrooms  [PDF]
Rabih Joseph Nabhan
Open Journal of Modern Linguistics (OJML) , 2017, DOI: 10.4236/ojml.2017.73014
Abstract: Stylistic awareness of a text-the knowledge of syntactic, semantic, and/or pragmatic features—leads to an overall understanding of a discourse. The study will focus on the stylistics of news genre as authentic material in classrooms. The aim of this article is to draw a comparison between the language features used in online news and those used in the printed newspapers to underscore the linguistic characteristics of such media. The data to analyze will be collected from two European news media. The electronic tool will be the BBC online news http://www.bbc.co.uk/news/, while the printed one will be International Herald Tribune. The purpose of this study is to highlight the linguistic variations, if they exist, between the two media. The language will be studied in terms of syntax, semantics, and pragmatics, showing how these linguistic subfields can affect the language and determine the level of complication in understanding meaning. For discourse analysis, the same theme and topic will be selected. Examples and samples from both media will be posted to display the differences of language use. The comparison will be organized and divided into three subtitles: Syntactic Differences, Pragmatic Differences, and Semantic Differences. The paper will also focus on the effect of hyperlinks on the language and how the unlimited amount of information compressed in the virtual media make the online news unique. In addition, the limitations and weaknesses of both media will be addressed to take the research a step forward in order to make teachers aware of the flaws while using these genuine objects in language classrooms.
Search Strategy and Using Databases in al-Najah National University
Hany Jabr
Cybrarians Journal , 2007,
Abstract: The aim of this study to identify several databases from several providers that an-Najah National University Library subscribed with for one year. To achieve the goals of the study a sample several databases types was chosen. This study, shown that the search technique in each database including the Boolean Search and the Truncation technique way deifier from database to another, several different symbols had been used. The researcher has come up with a number of recommendations, of these the research recommends the importance of holding a practical training workshop for clients to learn a bout the hows of databases utilization & the search technique in each database.
Photoacoustic Detection in the Michelson Interferometer Cavity  [PDF]
Mohammad I. Abu Taha, Ahmed S. Jabr
Journal of Modern Physics (JMP) , 2014, DOI: 10.4236/jmp.2014.59086
Abstract:

For the first time, we report photoacoustic (PA) signal detection in a cell placed within the Michelson interferometer cavity in an attempt to relate photoacoustic effect to the Michelson fringe shift as a result of changes in the cell. Both detection schemes were investigated using IR absorption and their sensitivities compared. Signals related to Michelson interferometer fringe and PA effect have shown good correlations with each other using different samples including some essential oils and their corresponding plant part from which the essential oil is usually obtained. Results were encouraging and will open the door widely to use the combined Michelson interferometer-photoacoustic spectroscopy (PAS) in trace gas detection for different applications.

Application of Calcium Phosphate Materials in Dentistry
Jabr S. Al-Sanabani,Ahmed A. Madfa,Fadhel A. Al-Sanabani
International Journal of Biomaterials , 2013, DOI: 10.1155/2013/876132
Abstract: Calcium phosphate materials are similar to bone in composition and in having bioactive and osteoconductive properties. Calcium phosphate materials in different forms, as cements, composites, and coatings, are used in many medical and dental applications. This paper reviews the applications of these materials in dentistry. It presents a brief history, dental applications, and methods for improving their mechanical properties. Notable research is highlighted regarding (1) application of calcium phosphate into various fields in dentistry; (2) improving mechanical properties of calcium phosphate; (3) biomimetic process and functionally graded materials. This paper deals with most common types of the calcium phosphate materials such as hydroxyapatite and tricalcium phosphate which are currently used in dental and medical fields. 1. Introduction Calcium phosphate materials have received a lot of research attention in recent years due to their chemical similarity to bones and teeth. They are attractive biomedical materials owing to their excellent biocompatibility and the nontoxicity of their chemical components [1–4]. Calcium phosphates belong to the group of bioactive synthetic materials and its most frequently used are the hydroxyapatite and the tricalcium phosphate. These types are commonly used due to their osteoconductivity, crystallographic structures, and chemical composition similar to the skeletal tissue. They are classified according to their “resorbability,” that is extent of degradation in vivo. Hydroxyapatite has been described as “nonresorbable” and tricalcium phosphate has been described as “resorbable” [3, 4]. Calcium phosphate materials show a positive interaction with living tissue that includes also differentiation of immature cells towards bone cells [4, 5]. These materials also have chemical bonding to the bone along the interface, thought to be triggered by the adsorption of bone growth-mediating proteins at the biomaterials surface [4, 6]. Hence, there will be a biochemically mediated strong bonding osteogenesis [6, 7]. In addition to compressive forces, to some degree tensile and shear forces can also be transmitted through the interface (“bony ingrowth”). The first calcium phosphate materials were used in the 1920s. They were used as bone substitute or bone graft [8]. It was reported that a “triple calcium phosphate” compound used in a bony defect promoted osteogenesis or new bone formation. In 1971, Monroe and his colleagues reported a method for the preparation of a calcium phosphate, principally mineral calcium-fluorapatite, and
Taxa de juros: comportamento, determina??o e implica??es para a economia brasileira
Omar, Jabr H. D.;
Revista de Economia Contemporanea , 2008, DOI: 10.1590/S1415-98482008000300003
Abstract: the main purpose of this paper is to analyze the behavior and the factors that determine the interest rate and its impact on conducting the macroeconomic policy in brazil through the period of july 1994 to august 2004. thus, the article attempts to address answers for three main questions: why real interest rates are high in brazil and what are the main forces that stand behind their determination? what are the economic implications if real interest rates remain high? what can be done to reduce real interest rates from their present levels? results obtained show that the main reasons for high real interest rates were found to be in: reducing and controlling the high rates of inflation, vulnerability of the foreign sector, high public debt, and the market structure of the banking sector. more over, it was argued that high real interest rates have perverse effects for economic growth and economic stability. to reduce interest rates from their present levels, certain recommendations were suggested with regard to monetary policy, fiscal policy, foreign sector, and competitive policy in the banking system.
Migraine with benign episodic unilateral mydriasis
Skeik N, Jabr FI
International Journal of General Medicine , 2011, DOI: http://dx.doi.org/10.2147/IJGM.S18613
Abstract: raine with benign episodic unilateral mydriasis Case report (4865) Total Article Views Authors: Skeik N, Jabr FI Published Date June 2011 Volume 2011:4 Pages 501 - 503 DOI: http://dx.doi.org/10.2147/IJGM.S18613 Nedaa Skeik1, Fadi I Jabr2 1Mayo Clinic, Rochester, MN, USA; 2Horizon Medical Center, Hospital Medicine, Dickson, TN, USA Abstract: Pupil asymmetry or anisocoria can have benign or malignant causes, and be categorized as acute or chronic. It can also be a normal finding in about 20% of cases. Benign episodic unilateral mydriasis is an isolated benign cause of intermittent pupil asymmetry. The exact pathophysiology is not always understood. According to one hypothesis, it is due to discordance between the sympathetic and parasympathetic systems. It is occasionally seen in patients with migraine. Some authors consider it a limited form of ophthalmoplegic migraine. We report a case of benign episodic unilateral mydriasis diagnosed in a 30-year-old lady with a history of migraine who had extensive negative neurological evaluation.
Migraine with benign episodic unilateral mydriasis
Skeik N,Jabr FI
International Journal of General Medicine , 2011,
Abstract: Nedaa Skeik1, Fadi I Jabr21Mayo Clinic, Rochester, MN, USA; 2Horizon Medical Center, Hospital Medicine, Dickson, TN, USAAbstract: Pupil asymmetry or anisocoria can have benign or malignant causes, and be categorized as acute or chronic. It can also be a normal finding in about 20% of cases. Benign episodic unilateral mydriasis is an isolated benign cause of intermittent pupil asymmetry. The exact pathophysiology is not always understood. According to one hypothesis, it is due to discordance between the sympathetic and parasympathetic systems. It is occasionally seen in patients with migraine. Some authors consider it a limited form of ophthalmoplegic migraine. We report a case of benign episodic unilateral mydriasis diagnosed in a 30-year-old lady with a history of migraine who had extensive negative neurological evaluation.Keywords: anisocoria, migraine, unilateral episodic mydriasis
Introducing the Skills of Self-assessment and Peer Feedback
Rania K. Jabr
Studies in Self-Access Learning Journal , 2011,
Abstract: The object of our teaching should not simply be to introduce our students to a foreign language, but it should be to enable them to perform well when we teachers are no longer there to support them. This means we need to teach them to be autonomous, and one way to succeed in this challenging task is to train them in the “skill” of self-assessment (Harris, 1997) and how to benefit from peer interaction.
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