I am holding a Master degree in physics, University of Baghdad (Iraq). My research field is in "Nano Technology " and “Applications of Laser in Communications”. Currently, I am PhD student at Universiti Sains Malaysia ( Applied and Engineering Physics). I have a variety of experience in different universities around the UAE. I am currently working as a lecturer at Ajman University. Beside the teaching role, I am a member in several committees ( budget and plan , Fundraising Council ,IAAC - International Academic Affairs Committee, AU’s Collection Development Committee, International Accreditation Committee for HCERES, and Organizer of Facilities for technology-driven teaching and learning. In addition, I am author/coauthor of more than 20 articles published in international journals. Research interest’s area: Nanostructures Thin Film - based (Solar cells, Photocatalyst, Sensors) and semiconductor laser with application
The fabrication of Nano-based shielding materials is an advancing research area in material sciences and nanotechnology. Although bulky lead-based products remain the primary choice for radiation protection, environmental disadvantages and high toxicity limit their potentials, necessitating less costly, compatible, eco-friendly, and light-weight alternatives. The theme of the presented investigation is to compare the ionization radiation shielding potentialities of the lead acetate (LA), lead nitrate (LN), and bismuth nitrate (BN)-doped zinc oxide nanorods-based thin films (ZONRs-TFs) produced via the chemical bath deposition (CBD) technique. The impact of the selected materials’ doping content on morphological and structural properties of ZONRs-TF was investigated. The X-ray diffractometer (XRD) analyses of both undoped and doped TFs revealed the existence of hexagonal quartzite crystal structures. The composition analysis by energy dispersive (EDX) detected the corrected elemental compositions of the deposited films. Field emission scanning electronic microscope (FESEM) images of the TFs showed highly porous and irregular surface morphologies of the randomly aligned NRs with cracks and voids. The undoped and 2 wt.% BN-doped TFs showed the smallest and largest grain size of 10.44 nm and 38.98 nm, respectively. The linear attenuation coefficient (µ) values of all the optimally doped ZONRs-TFs measured against the X-ray photon irradiation disclosed their excrement shielding potency. The measured µ values of the ZONRs-TFs displayed the trend of 1 wt.% LA-doped TF > 1 wt.% LN-doped TF > 3 wt.% BN-doped TF > undoped TFs). The values of μ of the ZONRs-TFs can be customized by adjusting the doping contents, which in turn controls the thickness and morphology of the TFs. In short, the proposed new types of the LA-, LN- and BN-doped ZONRs-TFs may contribute towards the development of the prospective ionization radiation shielding materials.
The numerical modeling of a copper zinc tin sulfide (CZTS)-based kesterite solar cell is described in detail in this article. To model FTO/ZnO/CdS/CZTS/MO structured solar cells, the Solar Cell Capacitance Simulator-one-dimension (SCAPS-1D) program was utilized. Numerical modeling was used to estimate and assess the parameters of various photovoltaic thin film solar cells. The impact of different parameters on solar cell performance and conversion efficiency were explored. Because the response of a solar cell is partly determined by its internal physical mechanism, J-V characteristic characteristics are insufficient to define a device’s behavior. Regardless of the conviction in solar cell modeling, variable attributes as well as many probable conditions must be handled for simulation. Promising optimized results were obtained with a conversion efficiency of (η% = 25.72%), a fill factor of (FF% = 83.75%), a short-circuit current of (JSC = 32.96436 mA/cm2), and an open-circuit voltage of (VOC = 0.64 V). The findings will aid in determining the feasibility of manufacturing high-efficiency CZTS-based solar cells. First, in the SCAPS-1D environment, the impacts of experimentally constructed CZTS solar cells were simulated. The experimental data was then compared to the simulated results from SCAPS-1D. After optimizing cell parameters, the conversion efficiency of the improved system was observed to rise. The influence of system factors, such as the thickness, acceptor, and donor carrier concentration densities of the absorber and electron transport layers, and the effect of temperature on the efficiency of CZTS-based photovoltaic cells, was explored using one-dimensional SCAPS-1D software. The suggested findings will be extremely useful to engineers and researchers in determining the best method for maximizing solar cell efficiency, as well as in the development of more efficient CZTS-based solar cells.
Cadmium telluride (CdTe), a metallic dichalcogenide material, was utilized as an absorber layer for thin film–based solar cells with appropriate configurations and the SCAPS–1D structures program was used to evaluate the results. In both known and developing thin film photovoltaic systems, a CdS thin–film buffer layer is frequently employed as a traditional n–type heterojunction partner. In this study, numerical simulation was used to determine a suitable non–toxic material for the buffer layer that can be used instead of CdS, among various types of buffer layers (ZnSe, ZnO, ZnS and In2S3) and carrier concentrations for the absorber layer (NA) and buffer layer (ND) were varied to determine the optimal simulation parameters. Carrier concentrations (NA from 2 × 1012 cm−3 to 2 × 1017 cm−3 and ND from 1 × 1016 cm−3 to 1 × 1022 cm−3) differed. The results showed that the use of CdS as a buffer–layer–based CdTe absorber layer for solar cell had the highest efficiency of 17.43%. Furthermore, high conversion efficiencies of 17.42% and 16.27% were for the ZnSe and ZnO-based buffer layers, respectively. As a result, ZnO and ZnSe are potential candidates for replacing the CdS buffer layer in thin–film solar cells. Here, the absorber (CdTe) and buffer (ZnSe) layers were chosen to improve the efficiency by finding the optimal density of the carrier concentration (acceptor and donor). The simulation findings above provide helpful recommendations for fabricating high–efficiency metal oxide–based solar cells in the lab.
Influence of magnetic field (B) on level of linearly polarized laser beam is of great importance in many modern applications, such as the field of spectrum, communications and sensors. We have studied the influence of magnetic fields of an amplitude of 0.32 T at 2 cm air-gap on the level of linearly polarized laser beam passing through the Faraday crystal. The Magnetic field was projected parallel and perpendicular on the axis of the Faraday crystal. A control system containing electronic circuit and thermal base to control on the stability of the injection current and the temperature of the semiconductor laser diode (SLD) respectively have designed. The operational direct current (DC) and an alternating current (AC) were used in this study. After inserted Faraday crystal between the poles of the magnetic field generator, the rotation of the polarization angle was investigated, the Verdet constant was calculated, and the output pulse distribution of the SLD was studied. The results show that any increase of magnetic field leads to increase in the rotation angle of the polarization. The Verdet constant has founded depend on the value of the magnetic field and the wavelength of laser. Finally, the expansion of Full Width Half Maximum (FWHM) and Peak Channel Number Shift (PCNS) for one channel has indicated the presence of a magnetic field of 14.6 mT and 2.6 mT respectively, and this led also the peak of the pulse to drop by a rate 461.24 a.u./T.
This study aims to investigate the impact of the use of blended learning on the achievement of Dentistry College students on a physics course at Ajman University. It compares the results of different ways of teaching the ‘Practical physics course’. The study was conducted using a quasi-experimental case study design. The participants of the study were 116 students, divided into two groups: one an experimental group (n = 59) and the other a control group (n = 57). An achievement test was designed to confirm the study’s validity and reliability. SPSS was used to analyze the data. The findings revealed that there were statistically significant differences between the experimental and the control groups, in favor of the experimental group. Moreover, the findings also revealed that achievement varied according to the gender of the students in the experimental group (in favor of females). The study recommends further research into the use of blended learning in higher education institutions.
SCAPS-1D simulation program is used here to calculate the effect of layers thickness of Mo/CdTe/CdS/ITO device on the solar cell performance parameters (short-circuit current density Jsc, open-circuit voltage Voc, fill factor efficiency FF%, and cell efficiency η%). SCAPS-1D numerical simulation results show a significant effect of the absorber layer thickness on the device performance, an optimal absorber layer thickness was achieved. The variation in CdS (buffer) layer thickness shows no observable effect in the values of FF% and Voc values, while a significant effect was observed in the values of Jsc, and η%. There is no observable change in the device performance parameters with variation in the ITO (window) layer thickness. The Quantum efficiency percentage was also affected by both the absorber and the buffer layers thickness to a limit, the QE% achievement was consistent with the optimal layer thickness.
In this study, Zinc Telluride (ZnTe)-based solar cells, which are metallic dichalcogenide materials, are used as a solar cell absorbent with the formation appropriate for solar cell use. The data has been analyzed by SCAPS-1D structures software. The replacement of Cadmium Sulfide CdS (buffer) layer by other green and save suitable materials has been investigated. The substituted buffer layers have been ZnSe, ZnS, CdSe, and In2S3. The higher device performance efficiency parameters have been found out when using CdS and ZnSe as buffer layers. SCAPS-1D shows that the optimal p-n junction device eff]iciency parameters have been achieved when the ZnTe (absorber) layer thickness is between 1200-1500 nm, while the ZnSe (buffer) layer thickness is between 20-60 nm, and the thickness of ZnO:Al (window) layer is 25 nm. The results of the simulation provide important hints that may enhance the performance of the cell with empirical studies useful in practical implementation.
Bacterial deactivation by cell-wall rupturing is widely described. Complete mineralization of both aqueous gram-positive Staphylococcus aureus and gram-negative Klebsiella pneumoniae, leaving no organic species, is described here for the first time. Solar-simulated radiation (with ~ 5% UV), with ZnO nanoparticle photocatalyst, is used. In addition to complete bacterial deactivation (~ 100%), their mineralization is achievable with time. Both bacteria, with thick and thin peptidoglycan layers, are mineralized. In thicker walled S. aureus, ~ 72% mineralization is achievable, while in thinner walled K. pneumoniae, mineralization is ~ 85%. Anthocyanin-sensitized ZnO shows higher catalytic efficiency under purely visible light, while pristine ZnO particles are more effective under simulated solar radiation. The results show the feasibility of using direct solar radiation in photocatalytic water disinfection without the need to use other more costly and hazardous methods. The study is especially useful to many societies having limited access to safe drinking water.
ZnO nanoparticles, stacked on the bottom of a glass dish, were used as a catalyst for the photodegradation of aqueous 2-chlorophenol (2-CP) contaminant. Solutions of 2-CP at different concentrations and pH values were passed over the ZnO film under simulated solar light. The effect of the light intensity on the contaminant photodegradation rate was investigated. The photodegradation efficiency was evaluated based on the percentage degradation, turnover number, turnover frequency, and quantum yield. The reaction efficiency parameters showed no significant variation when changing the pH across moderate values (neutral, slightly basic, and slightly acidic). Complete mineralization of the contaminant to CO2, H2O, and other minerals was confirmed by various analytical methods including high-performance liquid chromatography, ultraviolet–visible (UV–Vis) spectroscopy, and total organic carbon measurements. The continuous flow method applied in this work showed promising results in terms of safe removal of 2-CP from water at laboratory scale. More study of this method is needed to enable its use at larger, pilot plant scale.
Cases of respiratory disease have been caused by the outbreak of the novel coronavirus named COVID-19: “CO” for corona, “VI” for virus, and “D” for disease. The “19” represents 2019, the year the infection started in Wuhan City, China, since when it has since spread worldwide. COVID-19 ranges in severity from a mild, flu-like disease through pneumonia and respiratory failure to death. Severe symptoms, complications, and a high risk of infection are associated with elderly patients, along with chronic diseases like diabetes, as reported in a recent study.1, 2 Rapidly accumulating evidence suggests patients are more likely to be male and have a comorbidity such as hypertension, diabetes, cardiovascular disease, or chronic lung disease. One study has shown that old age, cardiovascular disease, diabetes, chronic respiratory disease, hypertension, and cancer are all associated with an increased risk of death.