The accuracy of nuclear reactor power calculations using diffusion codes is dependent on the quality of the homogenized cross sections generated by lattice codes. In this paper, the few-group constants generated by two reactor physics codes, SERPENT as Monte Carlo code and TRITON as deterministic code, is critically studied and their reliability is evaluated. The approach followed in this paper is as follows. First, the nuclear constants for APR1400 reactor core were generated using SERPENT and TRITON codes. For both codes, the critical spectrum was used as a weighting function. Second, 2-D diffusion calculations were performed using PARCS code employing the two few-group constant sets generated previously. Finally, an assessment of the results was performed. Comparison of the fewgroup constants showed excellent agreement with relative difference ~ 1%. The full core power distribution has showed a similar trend with the maximum relative difference between the two codes of ~7%.
Threshold conditions for depassivation of the reinforcing steel from Barakah nuclear power plants (BNPP) was evaluated using a galvanostatic technique (GS). Samples were galvanostatically polarized in Ca(OH)2 solutions with NaCl and depassivation of samples was monitored using potential variation. The conditions for the depassivation were evaluated as a function of pH and Cl- concentration. In the threshold conditions, a linear correlation was found between pH and log(Cl-). Using the linear correlation, a new parameter, M, as a function of pH and Cl- concentration is suggested.
Radon transform has suffered the typical problems of low resolution, and many researchers have proposed some different algorithms to solve this problem (Cary, 1998; Sacchi, et al., 1999; Trad, et al., 2003). As the operator in the original formulation of the high resolution Radon transform is inverted using Cholesky decomposition, which is relatively expensive compared to least squares Radon transform that utilizes the Levinson recursion to invert a Toeplitz form, we need to pay attention to develop robust and easy algorithms. In this paper, we discuss the least square method of parabolic Radon transform with conjugate gradient algorithm in time domain, which is less expensive than using Cholesky decomposition. Then, we apply this method to simulative seismic data for multiple attenuation, and get a satisfying result.
The adoption of British military model of policing by Abu Dhabi Police (ADP) is worth mentioning. Emanating from the fact that British police system is built upon the philosophy of Policing by Consent, ADP has adopted the key traits of the philosophy with little cognizance of its express implementation. The implementation of these and other foreign models by ADP may be considered among other attempts, efforts to overcome key challenges of ADP. The present study adopts a qualitative methodological approach in evaluating the concept in context of ADP.
What is the political impact of the Arab Spring on GCC status (UAE case)? What are the important measures taken by UAE authority? Arab spring is the term refers to the revolutionary wave of demonstrations and protesters both violent and non-violent happened in the Arab world since 2011. In this literature review we will try to find out the changes and impacts recently occurred toward the political and national security policies within GCC countries to maintain the political stability. Furthermore, a comparison analyzing different opinions of the recent changes happened on GCC since the rise of Arab Spring will be discussed.
The use of social media has been growing significantly in impact in the society today with various groups embracing the use of the tool. While these platforms arise as a norm due to the high level of use, there are various negative impacts that leads us to rethink the essence of these platforms. This research will seek to point out these negative effects and the overall impact social media has towards the national security of the UAE. The paper will also offer some legal position on how the UAE government views this problem and the legal measures they have set forth to mitigate occurrence of such incidences. The UAE government seems to have realized the problems in how the public interprets the messages sent through the social platform. Thus, it has established various systems to educate the users on how they could optimize the use of the social platform positively.
The impact of foreign radical beliefs on UAE university students continues to be a source of concern for policymakers in the UAE. Additionally, the general public is becoming increasingly agitated by the never-ending accounts of indoctrination from foreign teachers. Both of these matters mystify the future of the educational system and more importantly it may tilt the delicate political balance and lead to civil unrest. Thus, what is needed is a thorough and poised study on the impact of large numbers of foreign teachers with radical beliefs on the political balance of the UAE. In order to carry out such a study, this research adopted a qualitative approach using structured interviews, observations, case studies, journals, and public documents. However, the bulk of the data is from primary sources, due to the lack of readily available resources.
United Arab Emirates (UAE) is exposed to explicit and implicit threats. The UAE is surrounded by unstable countries for example, Bahrain. We also cannot ignore the complicated situations in the whole world particularly in the Middle East region, these situations are making direct and/or indirect impact on the UAE's developments, in terms of economy, society, environment, education and military forces
Fiber reinforced composites have been gaining wide use in the variety of applications such as military and aerospace. The performance of these composites may suffer when the material is exposed to adverse environments for long periods of time. In this research, the effect of different environmental conditions on the mechanical behavior of woven laminated composites is investigated. The major objective of the study is to evaluate the effects of water/humidity and temperature on the strength of woven laminated composites. It is observed that high temperature accelerates the degradation mechanism in the composite. The results revealed that the different climatic conditions have a deteriorative impact on the performance of the composite. The highest degradation impact was under the combined effect of hot water immersion and testing at high temperature.
Results of a computational and experimental study of the structure of counterflow diffusion flame under the effect of the electric field are reported. A simplified modeling approach is proposed to describe combustion in the presence of electric body force. The mass, momentum, species evolution and energy conservation equations were solved numerically using FLUENT program by importing the methane GRI-Mech 3.0 chemical mechanism to the program. The behavior of the flame under the electric field for different polarities was monitored and captured by high-speed camera.
