The British University in Egypt
Cairo, Egypt

The British University in Egypt is a private Egyptian university in El Sherouk, Cairo Governorate, Egypt. Founded in September 2005, through an inter governmental agreement, the University provides a British style of education and awards degrees validated by its partner UK universities and the Egyptian Supreme Council. Located some 30 km from downtown Cairo, the campus covers approximately 40 acres of land with some 27000 m² space of modern purpose-built teaching facilities. Employers regard these skills highly. BUE is not only an educational institution, but also a thriving academic, social and cultural centre with much to offer students of any age, nationality or social background. Wikipedia.

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Nashed G.G.L.,The British University in Egypt | Nashed G.G.L.,Ain Shams University
General Relativity and Gravitation | Year: 2013

A non-diagonal spherically symmetric tetrad field, involving four unknown functions of radial coordinate r, is applied to the equations of motion of f(T) gravity theory. A special exact vacuum solution with one constant of integration is obtained. The scalar torsion related to this special solution vanishes. To understand the physical meaning of the constant of integration we calculate the energy associated with this solution and show how it is related to the gravitational mass of the system. © 2013 Springer Science+Business Media New York.

Khalil S.,The British University in Egypt | Khalil S.,Ain Shams University
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2010

We propose a modified version of the TeV-scale B-L extension of the standard model, where neutrino masses are generated through the inverse seesaw mechanism. We show that heavy neutrinos in this model can be accessible via clean signals at the LHC. The search for the extra gauge boson ZB-L′ through the decay into dileptons or two dileptons plus missing energy is studied. We also show that the B-L extra Higgs boson can be directly probed at the LHC via a clean dilepton and missing energy signal. © 2010 The American Physical Society.

Mahmoud A.H.A.,Cairo University | Mahmoud A.H.A.,The British University in Egypt
Building and Environment | Year: 2011

Urban parks have complex surface structure that produces an environment with specific microclimatic qualities. These qualities affect the balance of energy of the human body and are applicable to an individual's thermal perception. They have impacts on using outdoor spaces especially in hot and arid regions. This study investigates users' thermal comfort in an urban park in Cairo, Egypt. The investigation was carried out during the hot and cold months using subjective surveys and field measurements. The campaign consisted of a subjective survey using questions on the perception of the thermal environmental applying seven-point ASHRAE 55 thermal sensation votes (TSV) in nine different zones in the urban park. At each zone, the thermal environment parameters - air temperature, solar radiation, air relative humidity and wind speed were measured. Through these data, the values of the Physiologically Equivalent Temperature (PET) were calculated in each zone using the RayMan model. The current people clothing and metabolic rate were recorded. The results of the field measurements were compared with judgements about the thermal environment. Results demonstrate that differences in the PET index among these zones due to different sky view factors (SVF) and wind speed. Results revealed an alteration in human comfort sensation between different landscape zones. This paper suggests that the thermal requirements of visitors and qualities of the local climate should be carefully considered when designing landscapes for the future urban parks in the hot and arid regions. © 2011 Elsevier Ltd.

Nashed G.G.L.,The British University in Egypt
International Journal of Modern Physics D | Year: 2015

A nondiagonal tetrad field having six unknown functions plus an angle Φ, which is a function of the radial coordinate r, azimuthal angle θ and the polar angle φ, is applied to the charged field equations of modified teleparallel theory of gravity. A special nonvacuum solution is derived with three constants of integration. The tetrad field of this solution is axially symmetric and its scalar torsion is constant. The associated metric of the derived solution gives Kerr-Newman spacetime. We have shown that the derived solution can be described by a local Lorentz transformations plus a diagonal tetrad field that is the square root of the Kerr-Newman metric. We show that any solution of general relativity (GR) can be a solution in f(T) under certain conditions. © 2015 World Scientific Publishing Company.

Nashed G.G.L.,The British University in Egypt
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2013

A tetrad field with spherical symmetry is applied to the charged field equations of f(T) gravity theory. A special spherically symmetric charged-dS solution is obtained. The scalar torsion of this solution is a vanishing quantity. The spacetime of the derived solution is rewritten as a multiplication of three matrices: The first matrix is a special case of Euler's angle "so(3)," the second matrix represents a boost transformation, while the third matrix is the square root of the spherically symmetric charged-dS metric. It is shown that the boost matrix is important because it plays an essential role in adjusting the spacetime to become a solution for f(T) theory. © 2013 American Physical Society.

Sheweka S.,The British University in Egypt
Energy Procedia | Year: 2011

On Tuesday April 28, 2009 a report for BBC displayed an interview with a Palestinian citizen rebuilt his destroyed house with mud brick and mentioned that, it is a shame to live in a mud house at this age. The researcher was struck by this interview which led to work on this research. Due to the siege, the Palestinians lost the hope to reconstruct their destroyed homes, public buildings and infrastructure. Building with mud bricks as a thermal insulation and environmentally friendly method, works as a fire resistant, sound proof and can be entirely chemical free. It is cheaper; 80 m2 house made of cement would cost around 16,000 dollars at least, but a mud one with local materials cost just 3,000 dollars. Best of all, it can be made on site in any shape, color or size, made of a mixture of clay, mud, sand, and water mixed with a binding material such as rice husks or straw. Mud bricks fulfill the compressive strength and heat conductivity requirements. It also keeps indoor temperatures stationary during the summer and winter as a thermal insulation method. It is a traditional building material in much of the Middle East, India, North Africa and the majority of the Islamic cities buildings. Recently, there have been attempts to revive the use of mud brick through special projects such as those instigated by Hassan Fathy in Egypt, the beautiful Cob House on Mayne Island, Canada, etc. The mud bricks aim to save energy. The energy crisis experienced in the past have shifted the focus of the economical gain to energy saving. The research will display all the successful methods of building with mud bricks in order to extract different recommendations from it. this will be a guide for anyone who want to build his own house in a wonderful form, shape, style and colors. Besides different recommendations for the governmental institutions to encourage the citizens to reconstruct their homes by this method and construct models of mud houses to teach the citizens how to build their own homes? Finally, earthen structures are cheap, environmentally friendly and it is not a shame to live in a mud house but it is a global trend to preserve and to protect the environment. © 2011 Published by Elsevier Ltd.

Ayoub B.M.,The British University in Egypt
RSC Advances | Year: 2015

The first UPLC method for simultaneous determination of empagliflozin, linagliptin and metformin hydrochloride in the different combinations of their pharmaceutical dosage forms was developed. Chromatographic separation was achieved on a Symmetry® Acclaim™ RSLC 120 C18 column (100 mm × 2.1 mm, 2.2 μm) applying isocratic elution based on potassium dihydrogen phosphate buffer pH (4)-methanol (50 : 50, v/v) as the mobile phase. The linearity, accuracy and precision were found to be acceptable over the concentration ranges of 1-32 μg mL-1, 0.5-16 μg mL-1 and 1-100 μg mL-1 for empagliflozin, linagliptin and metformin hydrochloride, respectively. All the variables were studied to optimize the chromatographic conditions. The optimized method was validated and proved to be suitable for the quality control of the mentioned drugs in their different pharmaceutical dosage forms. © The Royal Society of Chemistry.

In the current research, a non-cyclic simplified technique is utilized to determine the elastic shakedown limit moments of a cylindrical vessel-nozzle intersection. The determined shakedown limit moments are utilized to generate the elastic shakedown boundary and the Bree diagram of the structure. The structure is subjected to a spectrum of steady internal pressure magnitudes and cyclic out-of-plane bending moments on the nozzle. The generated Bree diagram is compared with previously generated Bree diagram of the same structure, but subjected to in-plane bending. Noticeable differences regarding the magnitudes of the generated shakedown boundaries are observed. Moreover, only failure due to reversed plasticity response occurs upon exceeding the generated shakedown boundary unlike cyclic in-plane bending where the structure experienced both reversed plasticity and ratchetting failure responses. The simplified technique outcomes showed excellent correlation with the results of full elastic-plastic cyclic loading finite element simulations. © 2013 Elsevier B.V.

Abdalla H.F.,The British University in Egypt
International Journal of Pressure Vessels and Piping | Year: 2014

No experimental data exist within open literature, to the best knowledge of the author, for determining shakedown boundaries of 90° back-to-back pipe bends. Ninety degree back-to-back pipe bends are extensively utilized within piping networks of nuclear submarines and modern turbofan aero-engines where space limitation is considered a paramount concern. In the current research, the 90° back-to-back pipe bend setup analyzed is subjected to a spectrum of steady internal pressures and cyclic in-plane bending moments. A previously developed direct non-cyclic simplified technique for determining elastic shakedown limit loads is utilized to generate the elastic shakedown boundary of the analyzed structure. The simplified technique outcomes showed excellent correlation with the results of full elastic-plastic cyclic loading finite element simulations. © 2014 Elsevier Ltd.

Energy integration is a key solution in chemical process and crude refining industries to minimise external fuel consumption and to face the impact of growing energy crises. Typical energy integration projects can reach a reduction of heating fuels and cold utilities by up to 40% compared with original designs or existing installations. Pinch Analysis is a leading tool and regarded as an efficient method to increase energy efficiency and minimise fuel flow consumptions. It is valid for both natures of design, grassroots and retrofit situations. It can practically be applied to synthesise a HEN (heat exchanger network) or modify an existing preheat train for minimum energy consumption. Heat recovery systems or HENs are networks for exchanging heat between hot and cold process sources. All heat transferred from hot process sources into cold process sinks represent the scope for energy integration. On the other hand, energies required beyond this integrated amount are to be satisfied by external utilities. Graphical representations of Pinch Analysis, such as Composite and Grand Composite Curves are very useful for grassroots designs. Nevertheless, in retrofit situation the analysis is not adequate and besides it is graphically tedious to represent existing exchangers on such graphs. This research proposes a new graphical method for the analysis of heat recovery systems, applicable to HEN retrofit. The new graphical method is based on plotting temperatures of process hot streams versus temperatures of process cold streams. A new graph is constructed for representing existing HENs. For a given network, each existing exchanger is represented by a straight line, whose slope is proportional to the ratio of heat capacities and flows. Further, the length of each exchanger line is related to the heat flow transferred across this exchanger. This new graphical representation can easily identify exchangers across the pinch, Network Pinch, pinching matches and improper placement of fuel consumption. Furthermore, such a graph can recognise promising modifications to improve the energy performance and hence less fuel and cooling water requirement. Graphs developed in this work can be used to analyse the energy performance of existing networks with respect to energy targets. They can also be used in junction with the background process to modify basic designs or existing network for better energy integration opportunities and minimum fuel demands. The application of the new graphical method to a case study showed savings of approximately 17% in energy demands and fuel consumption. © 2014 Elsevier Ltd.

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