Arabian journal for science and engineering, Nov 20, 2014
ABSTRACT Abstract: With the inception of King Abdullah City of Atomic and Renewable Energy in the... more ABSTRACT Abstract: With the inception of King Abdullah City of Atomic and Renewable Energy in the Kingdom, the future of nuclear power looks promising in near future. Although nuclear power will help solve the energy-related issues of the country, however, the high-level radioactive waste has to be stored securely. In this regard, an evaluation of the available geological data has been conducted to determine where the most suitable sites could serve as permanent disposal of radioactive wastes from future nuclear power activities in the Kingdom of Saudi Arabia. Also, the volume of high-level wastes expected to be generated have been estimated, so as to access the cost (and size) of such a disposal site. Conclusions are presented, indicating that by the year 2060, the construction of such a disposal site would be economically feasible, based upon a surcharge of 1 mill/kWh for the disposal activities. The site selection is tentative and very preliminary, since actual core drillings and other geologic assessments will be required before a site can be seriously proposed.
This commentary is based on the analyses of the participants’ responses provided in written form ... more This commentary is based on the analyses of the participants’ responses provided in written form while filling the questionnaires. The purpose of the study was to identify and analyze factors in individuals’ experiences about second language acquisition. The study was conducted through a research questionnaire. The questions were designed for particular outcomes needed for the research. The research was to find motivational, social, and demographic factors in learning second language. The research participants were the successful users of second language. The paper also discussed the different influences from society, and profession which are a support to learn second language or sometimes these influences work as hindrance. Questionnaire also dealt with the usefulness of language books and effectiveness of language teachers. The project involves 4 participants who filled in the answers. 50% of them have provided very short answers but the ideas are understandable and interpretable,...
CR-39 plastic detectors were used for fast neutron dose mapping in the radiotherapy facility at K... more CR-39 plastic detectors were used for fast neutron dose mapping in the radiotherapy facility at King AbdulAziz University Hospital (KAUH). Detectors were calibrated using a 252 Cf neutron source and a neutron dosimeter. After exposure chemical etching was performed using 6N NaOH solution at 70 0 C. Tracks were counted using an optical microscope and the number of tracks/cm 2 was converted to a neutron dose. 15 track detectors were distributed inside and outside the therapy room and were left for 32 days. The average neutron doses were 142.3 mSv on the accelerator head, 28.5 mSv on inside walls, 1.4 mSv beyond the beam shield, and 1 mSv in the control room.
Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOTPSS) is an organic conductive polym... more Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOTPSS) is an organic conductive polymer which has a great potential to replace metallic conductors in thin film electronics. This paper reports the experimental findings on the electromechanical performance of conductive PEDOTPSS thin films on a stretchable and flexible low modulus polymer substrate, polydimethylsiloxane (PDMS), having random micro-bumpy roughness features. All films were fabricated using the method of dip coating, which is cost effective and also favorable for mass production. The main goal of the study is to quantify the stretchability and bendability of dip coated PEDOTPSS thin films on PDMS substrate having random micro-bumpy type of roughness features. The films displayed almost constant resistance up to 10% axial strain and were also found to remain conductive when bent up to a diameter of 2 mm.
Functionally graded material that consists of gradually changed dual-phase compositions along the... more Functionally graded material that consists of gradually changed dual-phase compositions along the thickness direction of its structure has been introduced as an answer to sharp interfaces problems occur while the processing. In order to observe the morphological and shrinkage due to the sintering process, the Ni/Al2O3 FG samples were manufactured via powder metallurgy routes under argon atmosphere. This study reveals that the sintering temperature does affects the sintering behaviors including the microstructures and radial dimensions of the FG plates. The numerical simulation is found to be useful to predict the stress concentration area within the structures and consequently improve the design of the FG plates.
Mechanical performance of nanoparticle-based thin films depends on the method of fabrication and ... more Mechanical performance of nanoparticle-based thin films depends on the method of fabrication and the properties of the underlying substrate. This study presents experimental results of electromechanical response of micrometer-thick dip-coated silver nanoparticle-based films on rough and highly compliant (Young’s modulus between 120 and 130 kPa) polydimethylsiloxane substrate having random micro-bumpy surface. The experimental results demonstrate stretchability of 13% and flexibility of 3.43% for the as-fabricated metal–polymer laminate. The entire process being amenable to mass production suggests a cost-effective and high-throughput route toward the fabrication of stretchable/flexible electronic devices and thin film sensors.
International Journal of Advanced Manufacturing Technology
The complete design of a nuclear power reactor is a complicated task involving many disciplines. ... more The complete design of a nuclear power reactor is a complicated task involving many disciplines. Three main aspects of design of a reactor system include nuclear physics, heat removal and mechanical plus structural systems. This project is concerned with thermal hydraulics calculations, designing of a steam generator for this system and calculations for pump. In this project TRAN is used for the design of core thermal hydraulics. Steam generator is designed through code STEAMGEN whereas pump power is calculated by hand with some formulas. It is noted after calculations that max fuel temperature is less then fuel's melting point and max clad surface temperature is below saturation temperature. Water is leaving the core at 208.0 o C and entering in steam generator at same temperature. Water is leaving the steam generator at 203.2 o C and entering into core at this temperature. A pump of 15.38 kW is required to generate the required 276.86 kg/s flow and to overcome all the head los...
Arabian journal for science and engineering, Nov 20, 2014
ABSTRACT Abstract: With the inception of King Abdullah City of Atomic and Renewable Energy in the... more ABSTRACT Abstract: With the inception of King Abdullah City of Atomic and Renewable Energy in the Kingdom, the future of nuclear power looks promising in near future. Although nuclear power will help solve the energy-related issues of the country, however, the high-level radioactive waste has to be stored securely. In this regard, an evaluation of the available geological data has been conducted to determine where the most suitable sites could serve as permanent disposal of radioactive wastes from future nuclear power activities in the Kingdom of Saudi Arabia. Also, the volume of high-level wastes expected to be generated have been estimated, so as to access the cost (and size) of such a disposal site. Conclusions are presented, indicating that by the year 2060, the construction of such a disposal site would be economically feasible, based upon a surcharge of 1 mill/kWh for the disposal activities. The site selection is tentative and very preliminary, since actual core drillings and other geologic assessments will be required before a site can be seriously proposed.
This commentary is based on the analyses of the participants’ responses provided in written form ... more This commentary is based on the analyses of the participants’ responses provided in written form while filling the questionnaires. The purpose of the study was to identify and analyze factors in individuals’ experiences about second language acquisition. The study was conducted through a research questionnaire. The questions were designed for particular outcomes needed for the research. The research was to find motivational, social, and demographic factors in learning second language. The research participants were the successful users of second language. The paper also discussed the different influences from society, and profession which are a support to learn second language or sometimes these influences work as hindrance. Questionnaire also dealt with the usefulness of language books and effectiveness of language teachers. The project involves 4 participants who filled in the answers. 50% of them have provided very short answers but the ideas are understandable and interpretable,...
CR-39 plastic detectors were used for fast neutron dose mapping in the radiotherapy facility at K... more CR-39 plastic detectors were used for fast neutron dose mapping in the radiotherapy facility at King AbdulAziz University Hospital (KAUH). Detectors were calibrated using a 252 Cf neutron source and a neutron dosimeter. After exposure chemical etching was performed using 6N NaOH solution at 70 0 C. Tracks were counted using an optical microscope and the number of tracks/cm 2 was converted to a neutron dose. 15 track detectors were distributed inside and outside the therapy room and were left for 32 days. The average neutron doses were 142.3 mSv on the accelerator head, 28.5 mSv on inside walls, 1.4 mSv beyond the beam shield, and 1 mSv in the control room.
Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOTPSS) is an organic conductive polym... more Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOTPSS) is an organic conductive polymer which has a great potential to replace metallic conductors in thin film electronics. This paper reports the experimental findings on the electromechanical performance of conductive PEDOTPSS thin films on a stretchable and flexible low modulus polymer substrate, polydimethylsiloxane (PDMS), having random micro-bumpy roughness features. All films were fabricated using the method of dip coating, which is cost effective and also favorable for mass production. The main goal of the study is to quantify the stretchability and bendability of dip coated PEDOTPSS thin films on PDMS substrate having random micro-bumpy type of roughness features. The films displayed almost constant resistance up to 10% axial strain and were also found to remain conductive when bent up to a diameter of 2 mm.
Functionally graded material that consists of gradually changed dual-phase compositions along the... more Functionally graded material that consists of gradually changed dual-phase compositions along the thickness direction of its structure has been introduced as an answer to sharp interfaces problems occur while the processing. In order to observe the morphological and shrinkage due to the sintering process, the Ni/Al2O3 FG samples were manufactured via powder metallurgy routes under argon atmosphere. This study reveals that the sintering temperature does affects the sintering behaviors including the microstructures and radial dimensions of the FG plates. The numerical simulation is found to be useful to predict the stress concentration area within the structures and consequently improve the design of the FG plates.
Mechanical performance of nanoparticle-based thin films depends on the method of fabrication and ... more Mechanical performance of nanoparticle-based thin films depends on the method of fabrication and the properties of the underlying substrate. This study presents experimental results of electromechanical response of micrometer-thick dip-coated silver nanoparticle-based films on rough and highly compliant (Young’s modulus between 120 and 130 kPa) polydimethylsiloxane substrate having random micro-bumpy surface. The experimental results demonstrate stretchability of 13% and flexibility of 3.43% for the as-fabricated metal–polymer laminate. The entire process being amenable to mass production suggests a cost-effective and high-throughput route toward the fabrication of stretchable/flexible electronic devices and thin film sensors.
International Journal of Advanced Manufacturing Technology
The complete design of a nuclear power reactor is a complicated task involving many disciplines. ... more The complete design of a nuclear power reactor is a complicated task involving many disciplines. Three main aspects of design of a reactor system include nuclear physics, heat removal and mechanical plus structural systems. This project is concerned with thermal hydraulics calculations, designing of a steam generator for this system and calculations for pump. In this project TRAN is used for the design of core thermal hydraulics. Steam generator is designed through code STEAMGEN whereas pump power is calculated by hand with some formulas. It is noted after calculations that max fuel temperature is less then fuel's melting point and max clad surface temperature is below saturation temperature. Water is leaving the core at 208.0 o C and entering in steam generator at same temperature. Water is leaving the steam generator at 203.2 o C and entering into core at this temperature. A pump of 15.38 kW is required to generate the required 276.86 kg/s flow and to overcome all the head los...
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Papers by dheya al-othmany