Hamza Abubakar - Academia.edu (original) (raw)

Drafts by Hamza Abubakar

Radiation cannot be perceived by our normal senses, such as sight, feeling and smell. The study o... more Radiation cannot be perceived by our normal senses, such as sight, feeling and smell. The study of the radiation dose received by the patient during X-ray examination is important to reduce the risks of exposures. The aim of the current work is to assess patient radiation doses in routine X-ray examinations in Federal Teaching Hospital Gombe, Nigeria. We estimated the entrance skin dose received by patients undergoing routine X-ray examinations for 115 patients in eight types of X-ray examinations. X-ray factors such as mAs and kVp were recorded with focus to skin distance. And we used it in mathematical model to calculate the entrance skin dose. The mean entrance skin dose for examinations of the chest (PA, LAT), abdomen (AP), pelvis (AP), lumber spine (AP, LAT) and skull (PA, LAT) were 0.36, 0.18, 0.95, 0.36, 0.58, 1.32, 0.52 and 0.31 mGy respectively. When the result obtained in this study were compared with the reference level, the result were lower than the reference level. From the result obtained, you can conclude that getting proper radiological parameter can minimize the absorbed dose.

Papers by Hamza Abubakar

Vietnam Journal of Science and Technology

This paper examines the effects of variable viscosity with heat and mass transfer over a vertica... more This paper examines the effects of variable viscosity with heat and mass transfer over a vertical layer on the magnetic field intensity. The governing equation of continuity, energy, momentum, and concentration is transformed into the ordinary differential equations and then solved through the technique of perturbation. Expressions were generated for distribution of velocity, temperature, and concentration. Tests for parameter values of importance are described graphically and addressed quantitatively from a practical point of view.

Radiation cannot be perceived by our normal senses, such as sight, feeling and smell.Medical X-ra... more Radiation cannot be perceived by our normal senses, such as sight, feeling and smell.Medical X-rays Exposures in several countries are the most important synthetic source of exposure to ionizing radiation. However, the information of diagnostic X-rays medical exposure is integrated into international legislative repertories.Data on the assessment of patient’s entrance skin dose (ESD) and the health risk from conventional radiography in daily routine of diagnostic medical examinations is lacking in the city of Gombe.In this study, Entrance Skin dose (ESD) were estimated for patients undergoing common diagnostic X-ray examinations in one of the radiographic center in Gombe town. The ESD has been estimated using calculation techniques.The mean ESD for examinations of the chest (PA, LAT), abdomen (AP), pelvis (AP), lumber spine (AP, LAT) and skull (PA, LAT) were 0.36, 0.18, 0.95, 0.36, 0.58, 1.32, 0.52 and 0.31 mGy respectively. The determine coefficient (R2) was ranging between 0.94-0....

The aim of this work is to give in detail the standalone PV system for a household in Gombe (Nige... more The aim of this work is to give in detail the standalone PV system for a household in Gombe (Nigeria) with medium energy consumption is selected. The supply of sufficient and sustainable power provision to the country's citizens since the 80's has been an illusion when the signals to improve its power generation capacity to the nation have been neglected. The increase in activities of industry and the rapid growth of population necessitate the solar photovoltaic (PV) technology injection into the nations mix energy. In this study, direct current (DC) and alternative current (AC) appliances were considered. The total load power of these appliances is 3012.5 W. The array to load ratio determined as well as the daily watt-hour load shows that the use of hybrid system in this design is not recommended. To power these appliances, 31 modules, 18 batteries in the battery bank with system battery capacity of 4657.5 Ah and 3 charge controller are required. The use of stand-alone solar photovoltaic technology is recommended for sustainability, reliability and accessibility of power.

Radiation cannot be perceived by our normal senses, such as sight, feeling and smell.Medical X-ra... more Radiation cannot be perceived by our normal senses, such as sight, feeling and smell.Medical X-rays Exposures in several countries are the most important synthetic source of exposure to ionizing radiation. However, the information of diagnostic X-rays medical exposure is integrated into international legislative repertories.Data on the assessment of patient's entrance skin dose (ESD) and the health risk from conventional radiography in daily routine of diagnostic medical examinations is lacking in the city of Gombe.In this study, Entrance Skin dose (ESD) were estimated for patients undergoing common diagnostic X-ray examinations in one of the radiographic center in Gombe town. The ESD has been estimated using calculation techniques.The mean ESD for examinations of the chest (PA, LAT), abdomen (AP), pelvis (AP), lumber spine (AP, LAT) and skull (PA, LAT) were 0.36, 0.18, 0.95, 0.36, 0.58, 1.32, 0.52 and 0.31 mGy respectively. The determine coefficient (R²) was ranging between 0.94-0.97 and the correlation (R) was ranging between 0.97-0.99. The ESDs reported in this study are lower than comparable reference dose values published in the literature.

2011 37th EUROMICRO Conference on Software Engineering and Advanced Applications, 2011

Scoped memory in Real-time Specification for Java achieves a level of predictability not found in... more Scoped memory in Real-time Specification for Java achieves a level of predictability not found in applications that use the garbage collection. However, it creates new challenges for developers. First, the reference rules between scopes constrain the design of the application's memory model. Second, deciding on the appropriate number of scopes and which objects should be allocated into those scopes are not straightforward tasks. This paper presents an empirical study of this memory model using a simulation of a railway control system executed in Sun's RTS 2.2. Five different scoped memory design models were implemented in the case study and memory consumption for each was measured. Results showed that the number of scopes did not always indicate a good memory footprint, choosing the right objects/threads to be allocated in the right scopes is an important factor to be considered.

2011 UkSim 13th International Conference on Computer Modelling and Simulation, 2011

I would not have been able to provide and complete this Thesis without the sincere support and he... more I would not have been able to provide and complete this Thesis without the sincere support and help of many people. Foremost, I would like to thank my supervisor Dr. Steve Counsell for his patience, motivation, advice, and continuous help and support. He made my PhD journey an excellent experience with his knowledge, kindness, thoughtfulness and encouragement. I would like to dedicate my deep thanks for my mother, for the encouragement she provided, her unlimited patience, prayers and the sacrifices she made to help me after my father passed away, which without, I would not be able to achieve my goals and survive difficult times. I am greatly indebted to my sincere wife Dalia and my daughter Julie, without their hopeful smiles, emotional support, patience, understanding and infinite love I would not have been able to stand during the difficult moments in my PhD. I would like to convey my sincerest gratitude to my uncle Wahid Hamza who has been supportive through all my life stages. His sympathy and understanding were enormous and significantly appreciated. I am very grateful to all people in the Department of Information Systems and Computing at Brunel University who helped me during my study and provided such a friendly and comfortable environment. Last, but by no means least, I would like to thank all my friends and colleagues who have been my other family in the UK.

Journal for Studies in Management and Planning, 2015

This study investigated the relevance of mathematics skill in the teaching and learning of physic... more This study investigated the relevance of mathematics skill in the teaching and learning of physics at secondary schools level in Katsina State of Nigeria. The study was carried out in Dutsin-ma educational zone in Katsina state.

I would not have been able to provide and complete this Thesis without the sincere support and he... more I would not have been able to provide and complete this Thesis without the sincere support and help of many people. Foremost, I would like to thank my supervisor Dr. Steve Counsell for his patience, motivation, advice, and continuous help and support. He made my PhD journey an excellent experience with his knowledge, kindness, thoughtfulness and encouragement. I would like to dedicate my deep thanks for my mother, for the encouragement she provided, her unlimited patience, prayers and the sacrifices she made to help me after my father passed away, which without, I would not be able to achieve my goals and survive difficult times. I am greatly indebted to my sincere wife Dalia and my daughter Julie, without their hopeful smiles, emotional support, patience, understanding and infinite love I would not have been able to stand during the difficult moments in my PhD. I would like to convey my sincerest gratitude to my uncle Wahid Hamza who has been supportive through all my life stages. His sympathy and understanding were enormous and significantly appreciated. I am very grateful to all people in the Department of Information Systems and Computing at Brunel University who helped me during my study and provided such a friendly and comfortable environment. Last, but by no means least, I would like to thank all my friends and colleagues who have been my other family in the UK.

Eurasian Journal of Biosciences, 2020

This study was conducted in one of the private orchards in Al-Dair district, north of Basra Gover... more This study was conducted in one of the private orchards in Al-Dair district, north of Basra Governorate during the 2019 AD growing season, with the aim of studying the effect of foliar spray with antioxidants, Asc and Toc on some physiological and biochemical traits of tissue dates palm offshots, Al-Barhi cultivar which was irrigated from Shatt Al-Arab water. The experiment included seven treatments with antioxidants using the concentrations 125, 250 and 375 mg L-1 for each in addition to the control treatment (with distilled water only). The offshoots were sprayed four times. The results of the study showed the following: 1) The treatment of spraying with Toc at a concentration of 375 mg.L-1 recorded a significant difference in the increase of the height of the offshoot, and in the leaf content of the soluble protein f.w. The treatment also recorded the highest amount of P and K that reach 1.60 and 4.23 mg.g-1 d.w, respectively, and led to a decrease in the amount of Cl-, as it rea...

Proceedings of the 50th ACM Technical Symposium on Computer Science Education, 2019

If citing, it is advised that you check and use the publisher's definitive version for pagination... more If citing, it is advised that you check and use the publisher's definitive version for pagination, volume/issue, and date of publication details. And where the final published version is provided on the Research Portal, if citing you are again advised to check the publisher's website for any subsequent corrections.

MATEC Web of Conferences, 2019

In this work, we investigate the transient thermal analysis of two-dimensional cylindrical anisot... more In this work, we investigate the transient thermal analysis of two-dimensional cylindrical anisotropic medium subjected to a prescribed temperature at the two end sections and to a heat flux over the whole lateral surface. Due to the complexity of analytically solving the anisotropic heat conduction equation, a numerical solution has been developed. It is based on a coordinate transformation that reduces the anisotropic cylinder heat conduction problem to an equivalent isotropic one, without complicating the boundary conditions but with a more complicated geometry. The equation of heat conduction for this virtual medium is solved by the alternating directions method. The inverse transformation makes it possible to determine the thermal behavior of the anisotropic medium as a function of study parameters: diagonal and cross thermal conductivities, heat flux.

International Journal of Trend in Scientific Research and Development, 2018

Motivation is one of the factors that influence the productivity of people. Project Managers, Eng... more Motivation is one of the factors that influence the productivity of people. Project Managers, Engineers and Laborers, play a vital role in the management of projects in a Qatar Construction Industry success of these projects relies profoundly on their active participation and effective performance. Hence it is important to assess the impact of motivation and demotivation on the performance. The broad objective of this work is to assess the impact of motivation and demotivation in QCI. The specific objective of this paper is identifying the key factors that cause motivation and de-motivation in QCI. Literature review, survey with expert opinion and semi structured interviews were conducted to identify these factors. Using these factors to conduct specific motivational programmes will help in improving the productivity of people on a project.

Research in Oncology, 2017

Background: High grade glioma (HGG) is the most common primary malignant brain tumor. Radiotherap... more Background: High grade glioma (HGG) is the most common primary malignant brain tumor. Radiotherapy (RT) plays an important role in the treatment of this tumor. Aim: To compare the survival rates of HGG patients treated by conventional RT and those treated by hypofractionated or hyperfractionated RT combined with chemotherapy in two centers in Upper Egypt. Methods: Data of HGG patients from two cancer care facilities in Upper Egypt who were treated by surgery followed by RT and temozolomide (TMZ) in the period between 2007 and 2012 were reviewed. Radiotherapy schedules were either conventional RT (60 Gy in 30 fractions over 6 weeks, group A) or hypofractionated RT (45 Gy in 15 fractions over 3 weeks, group B) or hyperfractionated RT (64.8 Gy in, 1.2 Gy/fraction, 2 fractions/day, group C) with ± concurrent TMZ and adjuvant TMZ. Progression-free survival (PFS) and overall survival (OS) of patients after receiving the different types of RT treatment were evaluated. Results: Forty-eight patients with grade III or IV HGG were identified. They were classified into 3 groups (A, B and C) that included 17, 16 and 15 patients, respectively. The median PFS were 6, 9 and 8 months (p= 0.354) and the median OS were 11, 12 and 14 (p= 0.760) for group A, B and C, respectively. Late RT toxicity was not different between the 3 groups. Conclusion: The three radiation schedules had a similar efficacy in adult HGG patients.

Journal of Clinical Laboratory Analysis, 2017

This study examines the acceptance of mobile applications, marketing and non-marketing, among men... more This study examines the acceptance of mobile applications, marketing and non-marketing, among men and women of various age groups, mobile phone usage rates and cell phone attachment groupings. The study found that younger cell phone users were more likely to accept mobile applications. Differences in acceptance by men and women were found in only three of the eight applications tested. Mobile phone users with high usage rates and those with high cell phone attachment scores were also more willing to accept mobile applications.

Day 2 Tue, November 10, 2015, 2015

A mixture of Nitrogen and hydrocarbon gas was used as a cycling gas in a large rich gas condensat... more A mixture of Nitrogen and hydrocarbon gas was used as a cycling gas in a large rich gas condensate reservoir to maintain reservoir pressure and thus prevent condensate drop-out due to pressure decrease below the dew point pressure. The objective of using Nitrogen gas is to partially replace some of hydrocarbon injection gas, which has a high demand for Abu Dhabi domestic consumption. This paper presents the plan, implementation, results and analysis of an intensive reservoir monitoring program, which was conducted to monitor the Nitrogen injection and production. Additionally, the paper discusses lessons learned from the Nitrogen injection, inferences reached, and corrective actions taken. The Nitrogen injection was started as a Mixed Case (MC) injection, where a mixture of Nitrogen (~20%) and hydrocarbon gas (~80%) was injected in all existing injectors across the entire reservoir for a period of three years. The plan was to stop the MC injection and apply a Pure Case injection (PC...

Proceedings of the 13th International Workshop on Java Technologies for Real-time and Embedded Systems, 2015

Java has been developed with the particular suitability for embedded computing in mind due to its... more Java has been developed with the particular suitability for embedded computing in mind due to its high portability. However, when it comes to safety-critical systems, some beneficial features of Java, like Garbage Collection, are less suitable. Over the years communities have been working on suitable compromises, leading to the work on domain-specific Java standards like the Real-Time Specification for Java (RTSJ) and more recently the Safety-Critical Java (SCJ). In this paper we present the agenda and outline the design for a new Java Virtual Machine (JVM) for mixed-criticality systems, with the particular emphasis on not forbidding the use of standard Java libraries within the non-critical tasks.. We propose a high-level design of a JVM featuring design ideas to allow support for mixed-criticality systems.

Journal of Computing and Information Technology, 2010

Code smells represent code decay and as such should be eradicated from a system to prevent future... more Code smells represent code decay and as such should be eradicated from a system to prevent future maintenance problems. A range of twenty smells described by Fowler and Beck each require varying numbers and combinations of refactorings in order to be eradicated-but exactly how many are needed when we consider related, nested refactorings is unclear. In this paper, we enumerate these refactorings when categorised according to Mantyla's smell taxonomy. We then show how, ironically, the 'smelliest' of smells (and hence most difficult to eradicate) are actually those best understood by developers. So, code smells are not only unpleasant to have around, but are deceptive in their nature and make-up. The study is thus a warning against attempting to eradicate what are seemingly easily eradicated smells-these are often the smells the developer needs to be most wary of. Finally, we incorporate the answers to six questions suggested by Paul for 'How to write a paper properly' to position the paper in a reflective way.

Radiation cannot be perceived by our normal senses, such as sight, feeling and smell. The study o... more Radiation cannot be perceived by our normal senses, such as sight, feeling and smell. The study of the radiation dose received by the patient during X-ray examination is important to reduce the risks of exposures. The aim of the current work is to assess patient radiation doses in routine X-ray examinations in Federal Teaching Hospital Gombe, Nigeria. We estimated the entrance skin dose received by patients undergoing routine X-ray examinations for 115 patients in eight types of X-ray examinations. X-ray factors such as mAs and kVp were recorded with focus to skin distance. And we used it in mathematical model to calculate the entrance skin dose. The mean entrance skin dose for examinations of the chest (PA, LAT), abdomen (AP), pelvis (AP), lumber spine (AP, LAT) and skull (PA, LAT) were 0.36, 0.18, 0.95, 0.36, 0.58, 1.32, 0.52 and 0.31 mGy respectively. When the result obtained in this study were compared with the reference level, the result were lower than the reference level. From the result obtained, you can conclude that getting proper radiological parameter can minimize the absorbed dose.

Vietnam Journal of Science and Technology

This paper examines the effects of variable viscosity with heat and mass transfer over a vertica... more This paper examines the effects of variable viscosity with heat and mass transfer over a vertical layer on the magnetic field intensity. The governing equation of continuity, energy, momentum, and concentration is transformed into the ordinary differential equations and then solved through the technique of perturbation. Expressions were generated for distribution of velocity, temperature, and concentration. Tests for parameter values of importance are described graphically and addressed quantitatively from a practical point of view.

Radiation cannot be perceived by our normal senses, such as sight, feeling and smell.Medical X-ra... more Radiation cannot be perceived by our normal senses, such as sight, feeling and smell.Medical X-rays Exposures in several countries are the most important synthetic source of exposure to ionizing radiation. However, the information of diagnostic X-rays medical exposure is integrated into international legislative repertories.Data on the assessment of patient’s entrance skin dose (ESD) and the health risk from conventional radiography in daily routine of diagnostic medical examinations is lacking in the city of Gombe.In this study, Entrance Skin dose (ESD) were estimated for patients undergoing common diagnostic X-ray examinations in one of the radiographic center in Gombe town. The ESD has been estimated using calculation techniques.The mean ESD for examinations of the chest (PA, LAT), abdomen (AP), pelvis (AP), lumber spine (AP, LAT) and skull (PA, LAT) were 0.36, 0.18, 0.95, 0.36, 0.58, 1.32, 0.52 and 0.31 mGy respectively. The determine coefficient (R2) was ranging between 0.94-0....

The aim of this work is to give in detail the standalone PV system for a household in Gombe (Nige... more The aim of this work is to give in detail the standalone PV system for a household in Gombe (Nigeria) with medium energy consumption is selected. The supply of sufficient and sustainable power provision to the country's citizens since the 80's has been an illusion when the signals to improve its power generation capacity to the nation have been neglected. The increase in activities of industry and the rapid growth of population necessitate the solar photovoltaic (PV) technology injection into the nations mix energy. In this study, direct current (DC) and alternative current (AC) appliances were considered. The total load power of these appliances is 3012.5 W. The array to load ratio determined as well as the daily watt-hour load shows that the use of hybrid system in this design is not recommended. To power these appliances, 31 modules, 18 batteries in the battery bank with system battery capacity of 4657.5 Ah and 3 charge controller are required. The use of stand-alone solar photovoltaic technology is recommended for sustainability, reliability and accessibility of power.

Radiation cannot be perceived by our normal senses, such as sight, feeling and smell.Medical X-ra... more Radiation cannot be perceived by our normal senses, such as sight, feeling and smell.Medical X-rays Exposures in several countries are the most important synthetic source of exposure to ionizing radiation. However, the information of diagnostic X-rays medical exposure is integrated into international legislative repertories.Data on the assessment of patient's entrance skin dose (ESD) and the health risk from conventional radiography in daily routine of diagnostic medical examinations is lacking in the city of Gombe.In this study, Entrance Skin dose (ESD) were estimated for patients undergoing common diagnostic X-ray examinations in one of the radiographic center in Gombe town. The ESD has been estimated using calculation techniques.The mean ESD for examinations of the chest (PA, LAT), abdomen (AP), pelvis (AP), lumber spine (AP, LAT) and skull (PA, LAT) were 0.36, 0.18, 0.95, 0.36, 0.58, 1.32, 0.52 and 0.31 mGy respectively. The determine coefficient (R²) was ranging between 0.94-0.97 and the correlation (R) was ranging between 0.97-0.99. The ESDs reported in this study are lower than comparable reference dose values published in the literature.

2011 37th EUROMICRO Conference on Software Engineering and Advanced Applications, 2011

Scoped memory in Real-time Specification for Java achieves a level of predictability not found in... more Scoped memory in Real-time Specification for Java achieves a level of predictability not found in applications that use the garbage collection. However, it creates new challenges for developers. First, the reference rules between scopes constrain the design of the application's memory model. Second, deciding on the appropriate number of scopes and which objects should be allocated into those scopes are not straightforward tasks. This paper presents an empirical study of this memory model using a simulation of a railway control system executed in Sun's RTS 2.2. Five different scoped memory design models were implemented in the case study and memory consumption for each was measured. Results showed that the number of scopes did not always indicate a good memory footprint, choosing the right objects/threads to be allocated in the right scopes is an important factor to be considered.

2011 UkSim 13th International Conference on Computer Modelling and Simulation, 2011

I would not have been able to provide and complete this Thesis without the sincere support and he... more I would not have been able to provide and complete this Thesis without the sincere support and help of many people. Foremost, I would like to thank my supervisor Dr. Steve Counsell for his patience, motivation, advice, and continuous help and support. He made my PhD journey an excellent experience with his knowledge, kindness, thoughtfulness and encouragement. I would like to dedicate my deep thanks for my mother, for the encouragement she provided, her unlimited patience, prayers and the sacrifices she made to help me after my father passed away, which without, I would not be able to achieve my goals and survive difficult times. I am greatly indebted to my sincere wife Dalia and my daughter Julie, without their hopeful smiles, emotional support, patience, understanding and infinite love I would not have been able to stand during the difficult moments in my PhD. I would like to convey my sincerest gratitude to my uncle Wahid Hamza who has been supportive through all my life stages. His sympathy and understanding were enormous and significantly appreciated. I am very grateful to all people in the Department of Information Systems and Computing at Brunel University who helped me during my study and provided such a friendly and comfortable environment. Last, but by no means least, I would like to thank all my friends and colleagues who have been my other family in the UK.

Journal for Studies in Management and Planning, 2015

This study investigated the relevance of mathematics skill in the teaching and learning of physic... more This study investigated the relevance of mathematics skill in the teaching and learning of physics at secondary schools level in Katsina State of Nigeria. The study was carried out in Dutsin-ma educational zone in Katsina state.

I would not have been able to provide and complete this Thesis without the sincere support and he... more I would not have been able to provide and complete this Thesis without the sincere support and help of many people. Foremost, I would like to thank my supervisor Dr. Steve Counsell for his patience, motivation, advice, and continuous help and support. He made my PhD journey an excellent experience with his knowledge, kindness, thoughtfulness and encouragement. I would like to dedicate my deep thanks for my mother, for the encouragement she provided, her unlimited patience, prayers and the sacrifices she made to help me after my father passed away, which without, I would not be able to achieve my goals and survive difficult times. I am greatly indebted to my sincere wife Dalia and my daughter Julie, without their hopeful smiles, emotional support, patience, understanding and infinite love I would not have been able to stand during the difficult moments in my PhD. I would like to convey my sincerest gratitude to my uncle Wahid Hamza who has been supportive through all my life stages. His sympathy and understanding were enormous and significantly appreciated. I am very grateful to all people in the Department of Information Systems and Computing at Brunel University who helped me during my study and provided such a friendly and comfortable environment. Last, but by no means least, I would like to thank all my friends and colleagues who have been my other family in the UK.

Eurasian Journal of Biosciences, 2020

This study was conducted in one of the private orchards in Al-Dair district, north of Basra Gover... more This study was conducted in one of the private orchards in Al-Dair district, north of Basra Governorate during the 2019 AD growing season, with the aim of studying the effect of foliar spray with antioxidants, Asc and Toc on some physiological and biochemical traits of tissue dates palm offshots, Al-Barhi cultivar which was irrigated from Shatt Al-Arab water. The experiment included seven treatments with antioxidants using the concentrations 125, 250 and 375 mg L-1 for each in addition to the control treatment (with distilled water only). The offshoots were sprayed four times. The results of the study showed the following: 1) The treatment of spraying with Toc at a concentration of 375 mg.L-1 recorded a significant difference in the increase of the height of the offshoot, and in the leaf content of the soluble protein f.w. The treatment also recorded the highest amount of P and K that reach 1.60 and 4.23 mg.g-1 d.w, respectively, and led to a decrease in the amount of Cl-, as it rea...

Proceedings of the 50th ACM Technical Symposium on Computer Science Education, 2019

If citing, it is advised that you check and use the publisher's definitive version for pagination... more If citing, it is advised that you check and use the publisher's definitive version for pagination, volume/issue, and date of publication details. And where the final published version is provided on the Research Portal, if citing you are again advised to check the publisher's website for any subsequent corrections.

MATEC Web of Conferences, 2019

In this work, we investigate the transient thermal analysis of two-dimensional cylindrical anisot... more In this work, we investigate the transient thermal analysis of two-dimensional cylindrical anisotropic medium subjected to a prescribed temperature at the two end sections and to a heat flux over the whole lateral surface. Due to the complexity of analytically solving the anisotropic heat conduction equation, a numerical solution has been developed. It is based on a coordinate transformation that reduces the anisotropic cylinder heat conduction problem to an equivalent isotropic one, without complicating the boundary conditions but with a more complicated geometry. The equation of heat conduction for this virtual medium is solved by the alternating directions method. The inverse transformation makes it possible to determine the thermal behavior of the anisotropic medium as a function of study parameters: diagonal and cross thermal conductivities, heat flux.

International Journal of Trend in Scientific Research and Development, 2018

Motivation is one of the factors that influence the productivity of people. Project Managers, Eng... more Motivation is one of the factors that influence the productivity of people. Project Managers, Engineers and Laborers, play a vital role in the management of projects in a Qatar Construction Industry success of these projects relies profoundly on their active participation and effective performance. Hence it is important to assess the impact of motivation and demotivation on the performance. The broad objective of this work is to assess the impact of motivation and demotivation in QCI. The specific objective of this paper is identifying the key factors that cause motivation and de-motivation in QCI. Literature review, survey with expert opinion and semi structured interviews were conducted to identify these factors. Using these factors to conduct specific motivational programmes will help in improving the productivity of people on a project.

Research in Oncology, 2017

Background: High grade glioma (HGG) is the most common primary malignant brain tumor. Radiotherap... more Background: High grade glioma (HGG) is the most common primary malignant brain tumor. Radiotherapy (RT) plays an important role in the treatment of this tumor. Aim: To compare the survival rates of HGG patients treated by conventional RT and those treated by hypofractionated or hyperfractionated RT combined with chemotherapy in two centers in Upper Egypt. Methods: Data of HGG patients from two cancer care facilities in Upper Egypt who were treated by surgery followed by RT and temozolomide (TMZ) in the period between 2007 and 2012 were reviewed. Radiotherapy schedules were either conventional RT (60 Gy in 30 fractions over 6 weeks, group A) or hypofractionated RT (45 Gy in 15 fractions over 3 weeks, group B) or hyperfractionated RT (64.8 Gy in, 1.2 Gy/fraction, 2 fractions/day, group C) with ± concurrent TMZ and adjuvant TMZ. Progression-free survival (PFS) and overall survival (OS) of patients after receiving the different types of RT treatment were evaluated. Results: Forty-eight patients with grade III or IV HGG were identified. They were classified into 3 groups (A, B and C) that included 17, 16 and 15 patients, respectively. The median PFS were 6, 9 and 8 months (p= 0.354) and the median OS were 11, 12 and 14 (p= 0.760) for group A, B and C, respectively. Late RT toxicity was not different between the 3 groups. Conclusion: The three radiation schedules had a similar efficacy in adult HGG patients.

Journal of Clinical Laboratory Analysis, 2017

This study examines the acceptance of mobile applications, marketing and non-marketing, among men... more This study examines the acceptance of mobile applications, marketing and non-marketing, among men and women of various age groups, mobile phone usage rates and cell phone attachment groupings. The study found that younger cell phone users were more likely to accept mobile applications. Differences in acceptance by men and women were found in only three of the eight applications tested. Mobile phone users with high usage rates and those with high cell phone attachment scores were also more willing to accept mobile applications.

Day 2 Tue, November 10, 2015, 2015

A mixture of Nitrogen and hydrocarbon gas was used as a cycling gas in a large rich gas condensat... more A mixture of Nitrogen and hydrocarbon gas was used as a cycling gas in a large rich gas condensate reservoir to maintain reservoir pressure and thus prevent condensate drop-out due to pressure decrease below the dew point pressure. The objective of using Nitrogen gas is to partially replace some of hydrocarbon injection gas, which has a high demand for Abu Dhabi domestic consumption. This paper presents the plan, implementation, results and analysis of an intensive reservoir monitoring program, which was conducted to monitor the Nitrogen injection and production. Additionally, the paper discusses lessons learned from the Nitrogen injection, inferences reached, and corrective actions taken. The Nitrogen injection was started as a Mixed Case (MC) injection, where a mixture of Nitrogen (~20%) and hydrocarbon gas (~80%) was injected in all existing injectors across the entire reservoir for a period of three years. The plan was to stop the MC injection and apply a Pure Case injection (PC...

Proceedings of the 13th International Workshop on Java Technologies for Real-time and Embedded Systems, 2015

Java has been developed with the particular suitability for embedded computing in mind due to its... more Java has been developed with the particular suitability for embedded computing in mind due to its high portability. However, when it comes to safety-critical systems, some beneficial features of Java, like Garbage Collection, are less suitable. Over the years communities have been working on suitable compromises, leading to the work on domain-specific Java standards like the Real-Time Specification for Java (RTSJ) and more recently the Safety-Critical Java (SCJ). In this paper we present the agenda and outline the design for a new Java Virtual Machine (JVM) for mixed-criticality systems, with the particular emphasis on not forbidding the use of standard Java libraries within the non-critical tasks.. We propose a high-level design of a JVM featuring design ideas to allow support for mixed-criticality systems.

Journal of Computing and Information Technology, 2010

Code smells represent code decay and as such should be eradicated from a system to prevent future... more Code smells represent code decay and as such should be eradicated from a system to prevent future maintenance problems. A range of twenty smells described by Fowler and Beck each require varying numbers and combinations of refactorings in order to be eradicated-but exactly how many are needed when we consider related, nested refactorings is unclear. In this paper, we enumerate these refactorings when categorised according to Mantyla's smell taxonomy. We then show how, ironically, the 'smelliest' of smells (and hence most difficult to eradicate) are actually those best understood by developers. So, code smells are not only unpleasant to have around, but are deceptive in their nature and make-up. The study is thus a warning against attempting to eradicate what are seemingly easily eradicated smells-these are often the smells the developer needs to be most wary of. Finally, we incorporate the answers to six questions suggested by Paul for 'How to write a paper properly' to position the paper in a reflective way.

Proceedings of the 2013 International Conference on Principles and Practices of Programming on the Java Platform: Virtual Machines, Languages, and Tools, 2013

The Real-Time Specification for Java (RTSJ) introduces a new memory management model which avoids... more The Real-Time Specification for Java (RTSJ) introduces a new memory management model which avoids interfering with the garbage collection process. Two types of memory areas are provided - immortal and scoped. Using this memory management model is not straightforward, since many issues need to be considered. A developer has to decide on the objects that will be allocated in immortal or scoped memory areas and on the memory space required at runtime. On the other hand, reference checks between memory areas constrain the design of the real-time applications and increase the complexity of the development process. In previous work, a new RTSJ case study was implemented and discussed using different scoped memory models. The case study showed the complexity of using the new RTSJ memory model and the space overhead incurred by immortal memory. In this paper, dynamic code slicing is employed as a debugging technique to explore constant increases in immortal memory. Two programming design patterns are presented for decreasing immortal memory overheads generated by specific data structures. Experimental results showed a significant decrease in immortal memory consumption at runtime. The work therefore provides a new approach for assisting developers in debugging and optimising scoped and immortal memory implementation