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Search Results: 1 - 10 of 138938 matches for " Rania K. Jabr "
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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.
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.

Anti-HBc and HBV-DNA detection in blood donors negative for hepatitis B virus surface antigen  [PDF]
Hosny Badrawy, Rania Bakry
American Journal of Molecular Biology (AJMB) , 2013, DOI: 10.4236/ajmb.2013.31008
Abstract: Occult HBV infection is defined as the presence of hepatitis B virus (HBV) DNA in blood or liver tissues in patients negative for Hepatitis B surface Antigen (HBsAg). Those patients may or may not be positive for HBV antibodies. The objective of this study is to determine the presence or absence of HBV DNA in the serum samples from HBsAg negative blood donors. In addition we aimed to assess the magnitude of occult HBV infection and to reduce the risk of HBV infection. Over a period of one year a total of 7340 blood units were collected at blood transfusion center in our locality for the prevalence of HBV infection and 180 HBsAg negative blood specimens were randomly selected for anti-HBcIgM, anti-HBs antibody and HBV DNA. Ninety seven out of 7340 collected blood units were positive for HbsAg (1.3%).The randomly selected 180 tested donors revealed 7 (3.8%) positive for antiHBc IgM and 34 (18.8%) were positive for anti-HBs antibodies. Four out of 7 positive for anti-HBc IgM were also positive for anti-HBs and 2/180 (1.1%) specimens were positive for HBV DNA by PCR. Anti-HBc antibody should be tested routinely at any blood transfusion center and if they were positive regardless of anti-HBs titer, the blood should be discarded. Also HBV DNA is preferable to be performed to all blood donors to present completely safe blood transfusion.
Lecture Notes of Möbuis Transformation in Hyperbolic Plane  [PDF]
Rania B. M. Amer
Applied Mathematics (AM) , 2014, DOI: 10.4236/am.2014.515215
Abstract:

In this paper, I have provided a brief introduction on M?bius transformation and explored some basic properties of this kind of transformation. For instance, M?bius transformation is classified according to the invariant points. Moreover, we can see that M?bius transformation is hyperbolic isometries that form a group action PSL (2, R) on the upper half plane model.

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
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.
Non-invasive prediction of endometriosis revisited; 3 biomarkers as Angiopoietin-2, Interleukin-1β and Vascular Endothelial Growth Factor  [PDF]
Hoda Abdel Moety, Gihan I. Khalil, Rania M. El Sharkawy, Marwa K. El Ghandour, Fady S. Moiety, Hesham A. F. Salem
Open Journal of Obstetrics and Gynecology (OJOG) , 2013, DOI: 10.4236/ojog.2013.37095
Abstract:

Introduction: Endometriosis affects up to 1 every 5 women at their reproductive age, with variable and complex symptomatology. Patients may be asymptomatic but may have pain episodes or subfertility. Its negative impact is on patients’ health and quality of life. Objective: it was to investigate the serum and peritoneal fluid (PF) concentrations of Angiopoietin- 2, Interleukin-1β, and Vascular Endothelial Growth Factor, aiming to evaluate their diagnostic performance in endometriosis. Methods: Serum and peritoneal fluid samples were taken from 112 women undergoing laparoscopy for infertility, pelvic pain or adnexal masses. 61 diagnosed with endometriosis and 51 controlled. Primary outcome was to estimate serum and PF concentrations of Angio-2, IL-1β and VEGF and secondarily correlate these concentrations to disease stages thus assuming their diagnostic potential. Results: Significant differences were found between patients and control as regards serum and PF concentration of all studied markers except serum IL-1β. Serum Angio-2 and PF VEGF showed a significantly higher level in more advanced stages of endometriosis. PF VEGF showed a positively significant correlation with the stage of the disease, spearman coefficient t = 0.442 p = 0.014. PF concentrations of Angio-2 and Serum VEGF did not show significant pattern changes with stage-related levels. Diagnostic potential of serum and PF concentrations of the 3 markers were assessed by the ROC curve. Angio-2 proved an excellent diagnostic ability for endometriosis. PF and serum VEGF proved an equal diagnostic performance, whereas, PF IL-1β was the least efficient. Based on the results, we suggested preliminary serum threshold values for these markers to be used as diagnostic or follow-up landmarks with relatively acceptable sensitivity, specificity, positive and negative predictive values. Conclusion: Non-invasive predictive biomarkers for endometriosis were Serum Angio-2, IL-1β, and VEGF independently or in combination with the estimated threshold values. Serum Angio-2 merit is considered as a novel marker for endometriosis due to its diagnostic power.

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