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 ...
Read More
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 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.
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 ...
Read More
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 synthesized with cheap materials and using an easy and available method with low laboratory equipment and in a very short period of time. Subsequently, ...
Read More
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 synthesized with cheap materials and using an easy and available method with low laboratory equipment and in a very short period of time. Subsequently, the samples doped with iron and copper impurities. The structural and morphological properties of the prepared samples 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 with no any additional peaks observed. The functional groups and chemical interactions of the zinc oxide samples 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 conclude that the type of impurities influences the morphological changes while the structure remains unchanged. To investigate the band-gap, UV-Visible spectroscopy employed, showing a decrease in the band-gap of the samples with increasing impurities
mojtaba gholami; Bahareh Azarvand-Hassanfard
Abstract
This paper has studied the electronic properties of PdS2 monolayers doped with substitutional 3d, 4d, and 5d transition metals (TMs). The findings indicate that when a Pd atom is replaced by 3d metals (Sc, Fe), 4d metals (Y, Ru, Rh), and 5d metals (Os) through doping, the Fermi level moves towards the ...
Read More
This paper has studied the electronic properties of PdS2 monolayers doped with substitutional 3d, 4d, and 5d transition metals (TMs). The findings indicate that when a Pd atom is replaced by 3d metals (Sc, Fe), 4d metals (Y, Ru, Rh), and 5d metals (Os) through doping, the Fermi level moves towards the valence band maximum (VBM) or lies slightly below and around the conduction band minimum (CBM). Thus, the structure exhibits p-type semiconducting behavior. However, for doping with 3d metals (Ti, Cr, Co), 4d metals (Zr, Mo), and 5d metals (Hf, W, Ir, Au), the Fermi level penetrates into the CBM or located above and near the VBM, indicating n-type semiconducting behavior. The electronic structure of PdS2 remains a pristine semiconductor when doped with 3d metals (Ni, Zn), 4d metals (Pd, Cd), and 5d metals (Pt, Hg), with the largest band gap corresponding to these metals. Doping with 3d metals (V, Mn, Cu), 4d metals (Nb, Tc, Ag), and 5d metals (Ta, Re) significantly alters the electronic structure, converting the system into a conductor. These diverse changes can provide a scientific basis for developing spintronic devices.
Ahmad Kamalianfar
Abstract
In this work, pristine 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 nanopod films were examined using various techniques. SEM images of the surface of the samples showed that the ...
Read More
In this work, pristine 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 nanopod films were examined using various techniques. SEM images of the surface of the samples showed that the nanorods grew in a randomly oriented manner on the substrate. The optical study conducted to investigate the transmittance (T), band gap (Eg) and photoluminace of Ni doped ZnO. An increase in the band gap from 3.18 to 3.26 electron volts, as well as an increase in light transmission, observed in the diagram of nickel-doped zinc oxide.Photoluminescence (PL) spectroscopy measurements carried out to study the defects in grown thin films. The spectrum exhibited two characteristic emission peaks around 410 and 482 nm, which may be due to oxygen vacancy. Additionally, defects such as oxygen vacancies are observable based on the peaks in the Raman spectrum. In the conductivity vs. temperature graph, for temperatures above 300 degrees Celsius, there is a significant increase in conductivity and charge carriers.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 ...
Read More
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 used as an optical switch. The simulation results show that the structure's contrast ratio equal to 3.85 dB, which is more than that of 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.