Amirmohammad Beigzadeh; Hadi Ardiny
Abstract
Nuclear technology is rapidly expanding worldwide. However, radioactive materials pose a big risk to human societies and the environment. This is due to threats from terrorism, misuse, or unauthorized movement. Thus, we need to improve radioactive source detection and tracking systems. This will boost ...
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Nuclear technology is rapidly expanding worldwide. However, radioactive materials pose a big risk to human societies and the environment. This is due to threats from terrorism, misuse, or unauthorized movement. Thus, we need to improve radioactive source detection and tracking systems. This will boost security and stop terrorist actions. This paper introduces a novel approach for beam mapping and detection by employing machine vision algorithms and modeling nuclear detection systems that incorporate scintillating crystal detectors and photomultiplier tubes. The primary objective is to enhance the efficiency and accuracy in identifying and locating out-of-control radioactive sources within complex and dynamic environments through the utilization of modern machine vision techniques. The tracking method employed in this approach is based on the Kanade-Lucas-Tomasi (KLT) method. The developed system simultaneously acquires and processes moving images for detecting the trajectory characteristics of objects, while recording radiation data using the detector. By effectively combining spatial and radiation data with high precision, the out-of-control radioactive source is successfully identified amidst other moving objects.
dariush mehrparvar; masome naseri tekyeh; rostam moradian; shahriar mahdavi
Abstract
In this study, zinc oxide nano-sheets were prepared via the sol-gel method using zinc nitrate as the precursor salt, that pure and doped zinc oxide nanostructure were synthesized with cheap materials and in an easy and available method with low laboratory equipment and in a very short period of time. ...
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In this study, zinc oxide nano-sheets were prepared via the sol-gel method using zinc nitrate as the precursor salt, that pure and doped zinc oxide nanostructure were synthesized with cheap materials and in an easy and available method with low laboratory equipment and in a very short period of time. Subsequently, the samples were doped with iron and copper impurities. The structural and morphological properties of the prepared samples were determined using X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), and Fourier-transform infrared spectroscopy (FT-IR). The XRD results indicated that the zinc oxide nanoparticles in all samples adopted a wurtzite crystal structure without any additional peaks observed. The functional groups and chemical interactions of the zinc oxide samples were also determined at various peaks using FT-IR data, confirming the presence of Zn-O bonds in the samples as observed by XRD. The analysis of FESEM revealed that the impurities led to the formation of different morphologies for each sample. It can be concluded that the type of impurities influences the morphological changes while the structure remains unchanged. To investigate the band-gap, UV-Visible spectroscopy was employed, showing a decrease in the band-gap of the samples with increasing impurities.
mojtaba gholami; Bahareh Azarvand-Hassanfard
Abstract
In this article, electronic properties have been studied by substitution doping of 3d, 4d and 5d metals on PdS2 single layer. The obtained results show that in substitution doping of metals 3d(Sc, Fe), 4d(Y, Ru, Rh) and 5d(Os) instead of a Pd atom has shifted into the VBM, or is located under the CBM ...
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In this article, electronic properties have been studied by substitution doping of 3d, 4d and 5d metals on PdS2 single layer. The obtained results show that in substitution doping of metals 3d(Sc, Fe), 4d(Y, Ru, Rh) and 5d(Os) instead of a Pd atom has shifted into the VBM, or is located under the CBM and near it, so it has the structure of an acceptor semiconductor. But for doping 3d(Ti, Cr, Co), 4d metals (Zr,Mo) and 5d(Hf,W,Ir,Au) Fermi level has penetrated into the CBM or is located above the VBM and near it, in this case the doped structure plays the role of a donor semiconductor. But the electronic structure of PdS2 Due to the doping of 3d (Ni, Zn), 4d (Pd, Cd) and 5d (Pt, Hg) metals, it is changed and remains a dot semiconductor, as the highest energy gap is related to these metals. Doping 3d metals (V, Mn, Cu), 4d (Nb, Tc, Ag) and 5d (Ta, Re) completely change the electronic structure of the system and the system becomes a conductor. These various changes can be the basis of scientific ideas for making devices be considered spinronic.
Abdolrasoul Gharaati; Ghasem Forozani; Zeynab Rezaeian
Abstract
Designing and simulating two-dimensional photonic crystal-based biosensors is essential for the early and accurate detection of cancers. These biosensors can measure changes in the refractive index of cancer cells, which occur due to the increased concentration of proteins in these cells. In this research ...
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Designing and simulating two-dimensional photonic crystal-based biosensors is essential for the early and accurate detection of cancers. These biosensors can measure changes in the refractive index of cancer cells, which occur due to the increased concentration of proteins in these cells. In this research work, two-dimensional photonic crystal-based biosensors with dielectric rods made of germanium were designed and simulated. The results indicate that the designed two-dimensional photonic crystal-based biosensor exhibited high sensitivity and accuracy in detecting colon cancer cells. The proposed biosensor, designed to detect colon cancer cells known as LoVo, demonstrated a sensitivity of 567 nm/RIU and a quality factor of 10615, indicating its effective performance in identifying colon cancer cells. This sensor has the potential to be used in medical applications.
Ahmad Kamalianfar
Abstract
A B S T R A C TIn this work, undoped and Ni-doped ZnO nanopods were deposited on silicon substrate by pulsed-laser deposition (PLD) machine. The morphogical, optical and electricl properties of Ni-doped ZnO nanopods films were examined by utilizing various techniques. SEM images of the surface of the ...
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A B S T R A C TIn this work, undoped and Ni-doped ZnO nanopods were deposited on silicon substrate by pulsed-laser deposition (PLD) machine. The morphogical, optical and electricl properties of Ni-doped ZnO nanopods films were examined by utilizing various techniques. SEM images of the surface of the samples showed that the randomly oriented nanorods were grown on the substrate. The optical study was carried out to investigate the transmittance (T), band gap (Eg) and photoluminace of Ni doped ZnO. An increase in transmittance and band gap was observed after Ni doping. The optical band gap increaed slightly from 3.18 to 3.26 eV after adding Ni particle. The spectrum exhibited two characteristic emission peaks around 410 and 482 nm. Photoluminescence (PL) spectroscopy measurements are carried out to study the defects in grown thin films. The results indicate that Ni doping enhanced the optical charactteristics of the ZnO thin film and would be suitable candidates for optoelectric applictions
Mohammad Javad Maleki; Mohammad Soroosh; Ramakrishnan Rajasekar
Abstract
In this research, a new switch based on plasmonic ring resonator is proposed for the third telecommunication window. The designed structure consists of a ring in a silver region, the collar of which is barium oxide with silver nanoparticles, and it is considered a non-linear material. Placing the nonlinear ...
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In this research, a new switch based on plasmonic ring resonator is proposed for the third telecommunication window. The designed structure consists of a ring in a silver region, the collar of which is barium oxide with silver nanoparticles, and it is considered a non-linear material. Placing the nonlinear ring at a distance of 10 nm from the waveguide causes the transmitted light power to change the effective refractive index of the ring and changes its resonance wavelength. The dependence of the resonance wavelength of the nonlinear ring on the power of the optical pump causes a change in the interference pattern of the wave inside the ring with the passing signal. This makes the signal transmission efficiency controllable and the structure can be used as an optical switch. The simulation results show that the structure contrast ratio is equal to 3.85 dB, which is more than some previous works. The area of the designed structure is 0.093 µm2, which is a special feature compared to previous researches and is required in optical integrated circuits.