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Papers by Zina Abdulameer Shadidi

Research paper thumbnail of Numerical Investigation in Nitinol Lattice Stability and Safe Usage in Replacing Hard Tissue

Iraqi Journal of Science

NiTi (also called Nitinol) transforms from cubic (austenite) to monoclinic (martensite), and... more NiTi (also called Nitinol) transforms from cubic (austenite) to monoclinic (martensite), and vice versa, owing to the shape memory effect and superelasticity. Nitinol has a large number of biomedical applications because of its low elastic modulus close to that of natural bone material and good resistance to corrosion and fatigue, in addition to the transformation temperatures of nitinol that are close to body temperature. It has many other important applications, such as in the aircraft industry. In all these important applications, especially medical applications, Nitinol stability is an important factor for safety. Our goal is to study the stability of NiTi by calculating the phonon dispersion relation to obtain an accurate understanding of the mechanically unstable phases of the NiTi alloy. The dispersion relation for the cubic and monoclinic phases was studied and coded using MATLAB to make a clear consideration of the dispersion relation and its optical and acoustic bran...

Research paper thumbnail of Moisture and temperature effects on rocks materials and natural erosion energy

University of Aden Journal of Natural and Applied Sciences, Aug 31, 2017

Materials interact with pollutant in a very complex manner, the possibility of erosion, adsorptio... more Materials interact with pollutant in a very complex manner, the possibility of erosion, adsorption, desorption, transportation, deposition, and phase change will appear because of the interaction between the pollutant and the material surface. The effect of many other environmental effects also appear, like the effect of rain water in breaking away tiny rock particles (grit productivity). All the actions mentioned or any one of them may causes high damage or weaken the structure. This research highlights the importance of specific physical properties and material weakness, the effect of specific environmental factors (humidity, rain, and temperature) on materials, such as building materials and the potential occurrence places of cracks in the material, by knowing the quality of the material.

Research paper thumbnail of Enhancing Si Solar Cells Efficiency by Adding SiO2 / TiO2 Thin Films Using Transfer Matrix Method

4

Thin film silicon solar cells are nowadays the best choice to get electricity due to their low co... more Thin film silicon solar cells are nowadays the best choice to get electricity due to their low cost compared to the crystalline solar cells. However, thin film silicon solar cells have weak absorption of incident light. To deal with such a weakness and get better efficiency of these cells, an efficient back reflector composed of multilayer thin films (Silver, Silicon dioxide (SiO2) and Titanium dioxide (TiO2)) will be used. The transmitted light from the first silicon layer will be reflected by the next layer, and the reflected light will go back to the first silicon layer. By this way, the absorbance of the silicon solar cell can be increased by an increase in the probability of the light reflection from the SiO2, TiO2 and Ag. The transfer matrix method (TMM) by Matlab program will be used to analyze the results of the reflectance, transmittance and absorbance of the thin film layer and these results can prove the efficiency of the cells by using MATLAB codes.

Research paper thumbnail of The biological effects of radio waves on human body tissues

Journal of Genetic and Environmental Resources Conservation, Jan 26, 2021

Research paper thumbnail of ‫thermodynamic Lecture Notes . For Physics Students

Research paper thumbnail of Analytical Mechanics Lecture Notes

Research paper thumbnail of Basics of Quantum Mechanics

Research paper thumbnail of The Effect of Environmental Factors (Temperatures Humidity) on the Solar Cell Performance / Matlab Model

International Journal of Applied Mathematics and Theoretical Physics, 2020

This paper provides an accurate modeling method for the photovoltaic panel using Matlab software.... more This paper provides an accurate modeling method for the photovoltaic panel using Matlab software. The mathematical model discusses the effect of the environmental factors on PV panels. The model based on specifications given on the manufacturer's plate, a previous Simulink model was developed using Matlab code, to include the effect of humidity on the solar cell performance and efficiency. In the previous work on P-V characteristics, the temperature effect is discussed adequately, without mention the humidity side effects. In this paper, the effect of humidity on the fill factor and efficiency of solar cells is discussed. The conclusions come with many side effects of the humidity on the solar cell, which is the sediments trapped by water molecules, and energy loss due to the reflections of light from the condensed water surface. In addition to the heat carried by moister. The effect of this kind of heat has been studied through calculating the enthalpy of the moist air, and feel like temperature). According to this model and in Silicon solar cell, the lost energy due to reflection was equal to (G ave =842.0175 w/m 2) on average. Due to this loss, solar cell current and voltage will be different. All these effects lead to a decrease in the fill factor and the efficiency of the solar cell, because of a reduction in the absorbing energy.

Research paper thumbnail of Analysis of Optical Properties of SiO2 Thin Films for Various Thicknesses and Substrate Material Using Matlab Code

American Journal of Materials Synthesis and Processing, 2019

Theoretical study using mathematical analysis supported by Matlab code was created, for Silicon d... more Theoretical study using mathematical analysis supported by Matlab code was created, for Silicon dioxide (SiO 2) thin films on various substrate materials (Aluminium, quartz, and silicon), and different thicknesses. Reflectance and transmittance of the (SiO 2) thin film is strongly dependent on the electromagnetic wavelength. Many physical results were obtained. The results obtained serve as an illustration of the feasibility of simple techniques in measuring precisely the reflectance and absorptance of the (SiO 2) thin film with an error not exceeding 0.1%. The reflectance and absorptance characteristics of multilayer thin film are strongly dependent on the wavelength of the electromagnetic waves. The effects of various substrate materials on the reflectance characteristics have been investigated by evaluating the reflectance curves of SiO 2 thin films with thickness in the range of (100-1000) nm. The amplitude and periodicity of reflectance and absorptance changed with wavelength. Also the periodicity of this variety change with the film thickness and with the substrate material. In multilayer thin-film devices, the amount of light reflected at each interface can be adjusted by adjusting many factors like film thickness and substrate materials. beams phase can be adjusted by changing the layer thickness. There are thus two parameters associated with each layer, thickness and refractive index difference between film and substrate materials, which can be chosen to give the required performance.

Research paper thumbnail of Theoretical Comparison between Alumina and Fiberglass in Saving Heat Portability

Journal of Chemical Science and Technology, 2017

Energy is always exist in surroundings but it cannot be saved. Many sources of renewable energy w... more Energy is always exist in surroundings but it cannot be saved. Many sources of renewable energy were discovered, the problem is how to utilize it. One of the most usable energy sources is the solar energy. And one of the most difficulties is the absence of this source in the night, so it must be stored in the form of another kind of energy. This research focus on using the insulation materials in building hot water storage tanks supplied with solar power to save hot water. Theoretical comparison in terms of energy storage portability between the most two common materials are used in building these tanks. Matlab and Heat transfer equation used to compute properties for heat insulation and energy loss from the insulating material used to build the tank. Finite difference method used to solve heat equation for two kinds of insulating material (Alumina and fiberglass).

Research paper thumbnail of Numerical Investigation in Nitinol Lattice Stability and Safe Usage in Replacing Hard Tissue

Iraqi Journal of Science

NiTi (also called Nitinol) transforms from cubic (austenite) to monoclinic (martensite), and... more NiTi (also called Nitinol) transforms from cubic (austenite) to monoclinic (martensite), and vice versa, owing to the shape memory effect and superelasticity. Nitinol has a large number of biomedical applications because of its low elastic modulus close to that of natural bone material and good resistance to corrosion and fatigue, in addition to the transformation temperatures of nitinol that are close to body temperature. It has many other important applications, such as in the aircraft industry. In all these important applications, especially medical applications, Nitinol stability is an important factor for safety. Our goal is to study the stability of NiTi by calculating the phonon dispersion relation to obtain an accurate understanding of the mechanically unstable phases of the NiTi alloy. The dispersion relation for the cubic and monoclinic phases was studied and coded using MATLAB to make a clear consideration of the dispersion relation and its optical and acoustic bran...

Research paper thumbnail of Moisture and temperature effects on rocks materials and natural erosion energy

University of Aden Journal of Natural and Applied Sciences, Aug 31, 2017

Materials interact with pollutant in a very complex manner, the possibility of erosion, adsorptio... more Materials interact with pollutant in a very complex manner, the possibility of erosion, adsorption, desorption, transportation, deposition, and phase change will appear because of the interaction between the pollutant and the material surface. The effect of many other environmental effects also appear, like the effect of rain water in breaking away tiny rock particles (grit productivity). All the actions mentioned or any one of them may causes high damage or weaken the structure. This research highlights the importance of specific physical properties and material weakness, the effect of specific environmental factors (humidity, rain, and temperature) on materials, such as building materials and the potential occurrence places of cracks in the material, by knowing the quality of the material.

Research paper thumbnail of Enhancing Si Solar Cells Efficiency by Adding SiO2 / TiO2 Thin Films Using Transfer Matrix Method

4

Thin film silicon solar cells are nowadays the best choice to get electricity due to their low co... more Thin film silicon solar cells are nowadays the best choice to get electricity due to their low cost compared to the crystalline solar cells. However, thin film silicon solar cells have weak absorption of incident light. To deal with such a weakness and get better efficiency of these cells, an efficient back reflector composed of multilayer thin films (Silver, Silicon dioxide (SiO2) and Titanium dioxide (TiO2)) will be used. The transmitted light from the first silicon layer will be reflected by the next layer, and the reflected light will go back to the first silicon layer. By this way, the absorbance of the silicon solar cell can be increased by an increase in the probability of the light reflection from the SiO2, TiO2 and Ag. The transfer matrix method (TMM) by Matlab program will be used to analyze the results of the reflectance, transmittance and absorbance of the thin film layer and these results can prove the efficiency of the cells by using MATLAB codes.

Research paper thumbnail of The biological effects of radio waves on human body tissues

Journal of Genetic and Environmental Resources Conservation, Jan 26, 2021

Research paper thumbnail of ‫thermodynamic Lecture Notes . For Physics Students

Research paper thumbnail of Analytical Mechanics Lecture Notes

Research paper thumbnail of Basics of Quantum Mechanics

Research paper thumbnail of The Effect of Environmental Factors (Temperatures Humidity) on the Solar Cell Performance / Matlab Model

International Journal of Applied Mathematics and Theoretical Physics, 2020

This paper provides an accurate modeling method for the photovoltaic panel using Matlab software.... more This paper provides an accurate modeling method for the photovoltaic panel using Matlab software. The mathematical model discusses the effect of the environmental factors on PV panels. The model based on specifications given on the manufacturer's plate, a previous Simulink model was developed using Matlab code, to include the effect of humidity on the solar cell performance and efficiency. In the previous work on P-V characteristics, the temperature effect is discussed adequately, without mention the humidity side effects. In this paper, the effect of humidity on the fill factor and efficiency of solar cells is discussed. The conclusions come with many side effects of the humidity on the solar cell, which is the sediments trapped by water molecules, and energy loss due to the reflections of light from the condensed water surface. In addition to the heat carried by moister. The effect of this kind of heat has been studied through calculating the enthalpy of the moist air, and feel like temperature). According to this model and in Silicon solar cell, the lost energy due to reflection was equal to (G ave =842.0175 w/m 2) on average. Due to this loss, solar cell current and voltage will be different. All these effects lead to a decrease in the fill factor and the efficiency of the solar cell, because of a reduction in the absorbing energy.

Research paper thumbnail of Analysis of Optical Properties of SiO2 Thin Films for Various Thicknesses and Substrate Material Using Matlab Code

American Journal of Materials Synthesis and Processing, 2019

Theoretical study using mathematical analysis supported by Matlab code was created, for Silicon d... more Theoretical study using mathematical analysis supported by Matlab code was created, for Silicon dioxide (SiO 2) thin films on various substrate materials (Aluminium, quartz, and silicon), and different thicknesses. Reflectance and transmittance of the (SiO 2) thin film is strongly dependent on the electromagnetic wavelength. Many physical results were obtained. The results obtained serve as an illustration of the feasibility of simple techniques in measuring precisely the reflectance and absorptance of the (SiO 2) thin film with an error not exceeding 0.1%. The reflectance and absorptance characteristics of multilayer thin film are strongly dependent on the wavelength of the electromagnetic waves. The effects of various substrate materials on the reflectance characteristics have been investigated by evaluating the reflectance curves of SiO 2 thin films with thickness in the range of (100-1000) nm. The amplitude and periodicity of reflectance and absorptance changed with wavelength. Also the periodicity of this variety change with the film thickness and with the substrate material. In multilayer thin-film devices, the amount of light reflected at each interface can be adjusted by adjusting many factors like film thickness and substrate materials. beams phase can be adjusted by changing the layer thickness. There are thus two parameters associated with each layer, thickness and refractive index difference between film and substrate materials, which can be chosen to give the required performance.

Research paper thumbnail of Theoretical Comparison between Alumina and Fiberglass in Saving Heat Portability

Journal of Chemical Science and Technology, 2017

Energy is always exist in surroundings but it cannot be saved. Many sources of renewable energy w... more Energy is always exist in surroundings but it cannot be saved. Many sources of renewable energy were discovered, the problem is how to utilize it. One of the most usable energy sources is the solar energy. And one of the most difficulties is the absence of this source in the night, so it must be stored in the form of another kind of energy. This research focus on using the insulation materials in building hot water storage tanks supplied with solar power to save hot water. Theoretical comparison in terms of energy storage portability between the most two common materials are used in building these tanks. Matlab and Heat transfer equation used to compute properties for heat insulation and energy loss from the insulating material used to build the tank. Finite difference method used to solve heat equation for two kinds of insulating material (Alumina and fiberglass).