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Papers by sajid abbas

Journal of Electrical Engineering & Technology, 2022

Applied Mathematics and Mechanics, 2011

Aerodynamic noise due to interaction between incoming turbulence and rotating blades is an import... more Aerodynamic noise due to interaction between incoming turbulence and rotating blades is an important component in the wind turbine noise. The rod-airfoil configuration is used to investigate the interactive phenomenon experimentally and numerically. Distribution of unsteady pressure on the airfoil surface is measured for different rod positions and airfoil attack angles. Two National Advisory Committee for Aeronatics (NACA) airfoils, NACA0012 and NACA0018, and two wind turbine airfoils, S809 and S825 are investigated. In addition, for low angles of attack, the flow field around the airfoil’s leading edge is investigated with the particle image velocimetry (PIV). The experimental results indicate that unsteady pressure disturbances on the airfoil surface are related to the rod vortex shedding. Meanwhile, the interaction flow field of the rod and NACA0012 airfoil is simulated with the unsteady Reynolds averaged Navier-Stokes method (URANS), and the obtained pressure spectra are compared with the experimental results.

Computed tomography and laminography are heavily investigated in a compressive sensing based imag... more Computed tomography and laminography are heavily investigated in a compressive sensing based image reconstruction framework to reduce the dose to the patients as well as to the radiosensitive devices such as multilayer microelectronic circuit boards. Nowadays researchers are actively working on optimizing the compressive sensing based iterative image reconstruction algorithm to obtain better quality images. However, the effects of the sampled data's properties on reconstructed the image's quality, particularly in an insufficient sampled data conditions have not been explored in computed laminography. In this paper, we investigated the effects of two data properties i.e. sampling density and data incoherence on the reconstructed image obtained by conventional computed laminography and a recently proposed method called spherical sinusoidal scanning scheme. We have found that in a compressive sensing based image reconstruction framework, the image quality mainly depends upon th...

ABSTRACT: OBJECTIVE: To elaborate the reasons for the failure of P... more ABSTRACT: OBJECTIVE: To elaborate the reasons for the failure of Polio eradication in Pakistan. METHOD: We have done a descriptive study to measure the reasons for failure of polio control in Pakistan among 100 people from various districts of Punjab and K.P.K. that had children of <5 years at their homes. Coverage and awareness was good. The only barrier was the lack of interest among the people to vaccinate their children, limited advocacy and communication resources, poor health service structure problems in vaccinating areas and field programs and unreliable reporting, poor monitoring, supervision, unclear roles and responsibilities and decentralization RESULT: The Government is making substantial efforts for Polio eradication but there are certain drawb...

Journal of Materials Science: Materials in Electronics

Journal of Taibah University for Science

Electrochemical water splitting is a unique approach for producing renewable energy in hydrogen f... more Electrochemical water splitting is a unique approach for producing renewable energy in hydrogen fuel, though it is limited due to the sluggish kinetics of oxygen evolution reaction (OER). To enhance the efficacy of hydrogen production, it is a need to regulate oxygen evolution reaction. An efficient strategy is to construct a competent electrocatalyst with an immense open, active site, highly stable, porous structure, and large surface area. This study employs an inexpensive, facile, and eco-friendly single-step route to fabricate reduced graphene oxide (rGO) layers wrapped in polyaniline (PANI) sheets to achieve the controlled blades morphology. All the synthesized materials are characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), BET to examine their structural, morphological, and textural properties. Interestingly, when all the synthesized materials are employed for electrochemical measurements, rGO/PANI nanocomposite exhibits exceptional performance with a low overpotential of 221 mV to achieve a current density of 10 mA/cm2, lower Tafel slope of 37 mV/dec, and also high stability of 20 h. Overall, this work could lead up to the fabrication of innovative blade structured nanocomposite as an efficient electrocatalyst and make it applicable for multiple applications.

Research Journal of Social Sciences and Economics Review (RJSSER)

Creative writing owns an important place in the education system. It enlightens creativity and bo... more Creative writing owns an important place in the education system. It enlightens creativity and boosts critical thinking among students. Therefore, it appears to be a ruling skill. Knowing that conventional high-stakes examination leaves a key impact on teaching and learning, the present study was designed to identify the effect of high-stakes exams on creative writing skills of secondary level students of English as a Second Language (ESL) in Pakistan. For this, the content of a series of seven English tests by 8th, 9th, and 10th graders (separately) taken in one of the two spans of private coaching at a renowned tuition center for preparation of high-stakes exams was analyzed to see incremental change in students’ creative writing abilities. Analysis discovered that the whole of students’ content was mere replicas of ready-made notes except few traces of original effort by students only in the beginning. It was revealed that the system of examination is producing crammers rather th...

Zhejiang Sports Science, 2010

With the use of the Chinese version of BFS mood scale,the study was made to analyze the changes o... more With the use of the Chinese version of BFS mood scale,the study was made to analyze the changes of mood of college volleyball players before and after one match.The results showed that in addition to thoughtfulness,the winning team was to strengthen the trend of changes in mood before and after the game,in which pleasure of difference was significant.The losing team was to strengthen the trend factor for thoughtfulness and negative thought change,but active,and pleasant,and peaceful change of the trend was weakening,of which anger,depression,and no vitality,and pleasure of the difference was significant difference.The characteristics of active changes of winner and practice competition are consistent,changes in the characteristics of other factors of competition are consistent;the change of mind for losing team in accordance with the dynamic equilibrium mechanism,which include high-activity,high emotional state of mind changes in efficiency is expected before the match and activity,...

2013 IEEE Nuclear Science Symposium and Medical Imaging Conference (2013 NSS/MIC)

In low-dose computed tomography (CT), there is a tradeoff between acquiring an acceptable image q... more In low-dose computed tomography (CT), there is a tradeoff between acquiring an acceptable image quality and reducing delivered dose to the patient in general. Compressive sensing (CS) based iterative image reconstruction algorithms can provide a reasonable image quality under sparse data sampling conditions. In this work, a feasibility study of using a multi-slit aperture for low-dose CT is performed. We implemented an iterative algorithm that utilizes sampling density and data incoherence information to reconstruct the image from sparsely sampled data. We used projection data of a real mouse head, numerically applied a multi-slit aperture to the data, and successfully reconstructed images to an acceptable quality with about 70% dose reduction.

This paper discusses the theme of alienation and female friendship in black women in Toni Morriso... more This paper discusses the theme of alienation and female friendship in black women in Toni Morrison’s fiction. The female bonding is a possible way to deal with alienation which is caused by various factors as racial and social discriminations. This female bonding provides back women necessary support for mutual growth and assists them in combating various social pressures. However, it is argued here that this female friendship of black women in Morrison suffers from alienation in the long run. While foregrounding the healing power of female bonding which may allow women to survive under exploitation of various kinds, this paper brings for an argument that this female companionship nevertheless is corrupted by the power of explicit or implicit patriarchal forces working under the umbrella of social institutions of class and marriage. Hence the black women need to be on guard against all those forces which endanger the consistency of their mutual companionship.

Journal of Taibah University for Science

Renewable Energy

Abstract The receiver is crucial in converting concentrated solar radiation to thermal energy in ... more Abstract The receiver is crucial in converting concentrated solar radiation to thermal energy in a solar parabolic dish collector. The most popular type of receiver is a cavity receiver, which reduces heat loss from the body. In this paper, an experimental investigation of the energy, exergy, and optical performance of two cavity-type receivers for a solar parabolic dish concentrator was carried out. The cylindrical and conical cavity tube receivers were designed and tested in the temperature range of 35 °C–190 °C, with water as the working fluid and a flow rate of 0.83 L per minute. The results showed that the conical cavity tube receiver is the optimum design, while the cylindrical shape is the second choice. The conical cavity tube design achieved 62% average thermal efficiency, 11% exergy efficiency, while the maximum optical efficiency was 82% under average solar irradiation of 865 W/m2. The overall heat loss coefficients of cylindrical and conical cavity receivers from the stagnation measure were 137 W/m2 and 125 W/m2, respectively. The maximum and average surface temperatures for both cylindrical and conical cavity tube receivers were reached at 140 °C, 115 °C and 155 °C, 125 °C, respectively. The simulation study was conducted using COMSOL Multiphysics software to investigate the temperature distribution of the receivers. The proposed lightweight conical cavity tube receiver was found to have a high capacity to be used with a solar parabolic dish-style concentrating device to operate heating water applications.

sjesr

The study recognizes that word problems are the necessary part and a key component of mathematics... more The study recognizes that word problems are the necessary part and a key component of mathematics education. Knowing that mathematics, language as a means, and the situation context are never separable, the study was designed to identify the effect of language (L1, L2) and the context on problem solving in mathematics for 2nd, 3rd, and 4th grader English as a second language (ESL) learners. For this, four achievement tests with possible variations of language and context were utilized as instrument to investigate three research questions. 867 students from three existing scenarios of school mathematics learning in Pakistan participated in the study. The data were analyzed through SPSS utilizing both descriptive as well as inferential methods. The results revealed that language and context have significant effect on problem solving. The study exposed that mathematical problem-solving assessments cannot be called valid if the factors of language and context are not taken into consider...

International Journal of Emerging Research in Management and Technology

The concept of cable-stayed bridges dates back to the seventeenth century. Due to their aesthetic... more The concept of cable-stayed bridges dates back to the seventeenth century. Due to their aesthetic appearance, efficient utilization of material, and availability of new construction technologies, cable-stayed bridges have gained much popularity in the last few decades. After successful construction of the Sutong Bridge, a number of bridges of this type have been proposed and are under construction, which calls for extensive research work in this field. Nowadays, very long span cable-stayed bridges are being built and the ambition is to further increase the span length using shallower and slender girders. In order to achieve this, accurate procedures need to be developed which can lead to a thorough understanding and a realistic prediction of the bridge’s structural response under different load conditions.In the present study, an attempt has been made to analyze the seismic response of cable stayed bridges with single pylon and two equal side spans. This study has made an effort to ...

International Journal of Trend in Scientific Research and Development

Agriculture is the source of living of majority Indians and it also has a countless influence on ... more Agriculture is the source of living of majority Indians and it also has a countless influence on economy of the country. The objective of our project is to reduce this manual involvement by the farmer by using an automated irrigation system which purpose is to enhance water use for agricultural crops. This paper deals with automatic irrigation system senses the moisture content of the soil and automatically switches the pump when the power is on. In this project an automation of farm irrigation and soil moisture control by Arduino using soil moisture sensor and L293D module. This automatic irrigation system senses the moisture content of the soil and automatically switches the pump when the power is on.

Journal of Electrical Engineering & Technology, 2022

Applied Mathematics and Mechanics, 2011

Journal of Materials Science: Materials in Electronics

Journal of Taibah University for Science

Research Journal of Social Sciences and Economics Review (RJSSER)

Zhejiang Sports Science, 2010

2013 IEEE Nuclear Science Symposium and Medical Imaging Conference (2013 NSS/MIC)

Journal of Taibah University for Science

Renewable Energy

sjesr

International Journal of Emerging Research in Management and Technology

International Journal of Trend in Scientific Research and Development