查看更多>>摘要：After avoiding the Standard Test Condition (STC) related to the manufacturer of PV cells, accurate solar system modeling is considered the most important task to study this system. Several mathematical developments based-approaches or algorithms were considered valuable tools to parameterize the electrical circuit of the photovoltaic models. Thus, these parameters are well determined using optimization algorithms. To achieve this goal, an experimental database or manufacturer's datasheet is requested. This paper proposes a novel Improved Arithmetic Optimization Algorithm (IAOA) to extract the solar cell/panel parameters. Also, practical tests are presented for obtaining the measured illustration of the I-V and P-V characteristics. Thus, the Double Diode Model (DDM) of the electrical circuit of PV panel is studied considering various statistical analyzes, to know the Minimum (Min(Fobj), (DDM)), the Maximum (Max(Fobj), (DDM)). DDm ), the Average (Ave(Fobj), (DDM)), and the Standard Deviation (SDFobj, (DDM)). The estimated I-V and P-V curves using IAOA is compared with eight other recently published algorithms. In addition, the evaluation of the proposed IAOA proves that this proposal has a satisfactory performance than all tested algorithms. The obtained results show that the IAOA is considered first in terms of effectiveness and accuracy by 9.537e(-06) of standard deviation. Moreover, considering the variability of operating conditions, the proposed IAOA shows its high superiority to optimize the electrical parameters of the solar cell TDM Where it has the lowest errors by 3.623e(-05) of RMSE, 4.183e(-06) of MAE, and 1.397ee(-05) of RMSD.
查看更多>>摘要：In this paper, a perturbed traveling wave reduction of the Tricky-Biswas equation, which is used to describe the propagation of pulses in nonlinear optics, is considered. A stability analysis of the investigated ODE system without perturbation is carried out. The Melnikov function along the homoclinic orbit is constructed. It is found that in the studied system the necessary condition for occurrence of homoclinic chaos is always satisfied. A perturbation is added to the system to control the chaos obtained. Constraints on the parameters of the new system, at which homoclinic chaos is realized in it, are found. The attraction basins are plotted. It is found that their structure is fractal when the damping parameter values are less than the critical ones obtained by the Melnikov approach. The results of the numerical analysis go in agreement with those acquired theoretically.
查看更多>>摘要：We examine the feasibility of analyzing the behavior of a radiating pulse during its propagation in an optical fiber transmission line by the collective coordinates approach. We show that once the waves radiation are created, their dynamics is well described by the variational equations. We also show that, these waves of radiation do not keep a constant profile during their propagation, but are spread out continuously. Their frequency remains constant and is compared to the carrying frequency at a variation ranging between GHz and THz. The precise knowledge of the frequency or the temporal position of the radiation allows us to consider the possibility of removing the radiation in one operation by spectral or temporal filtering.
查看更多>>摘要：An efficient semi-organic nonlinear optical single crystal of L-tryptophan hydrochloride (LTHC) of molecular formula C11H13N2O2Cl has been synthesized and its elemental composition was confirmed by EDS analysis. The crystallographic system and lattice parameters were found by single crystal XRD analysis which indicates the synthesized crystal corresponds to monoclinic system of space group P21 and its crystalline nature was identified by powder XRD analysis. The typical characteristic vibrational modes of the grown LTHC crystal were identified by FTIR spectral analysis. The grown crystal's optical properties were analyzed by UV-Vis-NIR and Photoluminescence analyses. The wavelength dependent optical constants were also measured, and its refractive index at 532 nm was found to be 1.67. The grown crystal's mechanical stability was determined with the help of Vicker's hardness tester, which revealed that LTHC has soft material behaviour. TG-DTA-DSC tests were used to examine the thermal behaviour such as decomposition phenomena, phase transition, and melting point of the grown crystal, which revealed that it has high thermal stability up to 205 degrees. The dielectric behaviour, a.c. conductivity of LTHC crystal was studied by dielectric studies and its nonlinear efficiency was analyzed by Kurtz-Perry technique. The crystalline morphology of LTHC was examined by TEM and SEM analyses. Its optical damage property was analyzed by laser damage threshold analysis. The antimicrobial property of LTHC was also scrutinized against bacterial as well as fungal strains by Agar disk diffusion method. Finally, all these findings recommended that LTHC crystals could be useful in biomedical and nonlinear optics applications.
查看更多>>摘要：We study the bound states in the continuum (BICs) of the periodic structure with three nanobars in one lattice. It shows that both at-Gamma BICs and off-Gamma BICs can be modulated by the parameters of the center bar. It is also found that the number of BICs of both types are associated with the nanobar array layers, and Q factor can exceed 10(5). Results form FDTD and CMT are agree well, which are beneficial to the development of the optical devices based on BICs.
查看更多>>摘要：Radio over Fiber (RoF) systems form a crucial component of fifth generation (5G) mobile phone networks targeting higher capacity and better cost effectiveness in the existing telecommunication system architecture. An enhanced 32 channel 256 Gbps DWDM based RoF optical system incorporating DCF and FBG as dispersion compensators has been analyzed in Optisystem software, capable to transmit data at 8 Gbps per channel offering optimum signal reception over distances of 60 km and 120 km. Maximum Q factors of 15.34 and 15.97 were obtained for narrowed 50 GHz channel spacing for 60 km and 120 km respectively in 32 channel mode. The proposed system delivered very high Q factor of around 79 for 50 GHz channel spacing when operated in 8 channel mode at 4 Gbps per channel bit rate. Appreciable FWM side band power level reduction of average 6 dBm was also shown from the obtained spectrums. The transmission quality for long haul traversal (120 km) and constricted channel spacing (50 GHz) was observed to be much better than the existing WDM-RoF architectures.
查看更多>>摘要：A new optical encryption technology based on spiral structured phase coherent superposition and vector beam generation system is proposed. Firstly, the original image is scrambled by Arnold transform, and the scrambled image is encoded into two phase plates by using the spiral structured phase plates and the principle of coherent superposition. Then these two phases are brought into the vector beam generation system, and Stokes parameters of vector beam are recorded on the output plane to complete the image encryption. The original image can be recovered with the correct keys when decrypted. The system has good key sensitivity and resistance to occlusion attacks. The simulation results verified the correctness and effectiveness of the method.
查看更多>>摘要：In order to deal with the error of oblivious key distribution caused by quantum channel noise, a new quantum privacy query (QPQ) protocol with six-qubit with decoherence is proposed. When the error rate caused by quantum channel noise is less than 30%, the final key bit error rate of this protocol is better than that of other QPQ protocols using the same post-processing algorithm. Furthermore, the protocol is also a cheat-sensitive protocol, in which dishonesty of either party can be detected.
查看更多>>摘要：In this article, Jacobi elliptic function expansion method is applied to secure optical soliton solutions in magneto-optic waveguides for coupled system of nonlinear Biswas-Milovic equation with Kudryashov's law of refractive index. Bright soliton solutions, dark soliton solutions and singular-bright combo soliton solutions are obtained. Also, periodic solutions and Jacobi elliptic solutions are reported. The most significant achievement of this approach is that it offers all the solutions that can be found by the use of other techniques. Moreover, for the physical illustration, some of the obtained solutions are represented graphically.
查看更多>>摘要：Image fusion is the process of fusing multiple images of the same scene to obtain a more informative image for human eye perception. In this paper, a new fusion framework based on Quaternion Non-Subsampled Contourlet Transform (QNSCT) and Guided Filter detail enhancement is designed to address the problems of inconspicuous infrared targets and poor background texture in Infrared and visible image fusion. The proposed method uses the quaternion wavelet transform for the first time instead of the traditional Non-Subsampled Pyramid Filter Bank structure in the Non-Subsampled Contourlet Transform (NSCT). The flexible multi-resolution of quaternion wavelet and the multi-directionality of NSCT are fully utilized to refine the multi-scale decomposition scheme. On the other hand, the coefficient matrix obtained from the proposed QNSCT algorithm is fused using a weight refinement algorithm based on the guided filter. The fusion scheme is divided into four steps. First, the Infrared and visible images are decomposed into multi-directional and multiscale coefficient matrices using QNSCT. The experimental results show that the proposed algorithm not only extracts important visual information from the source image, but also preserves the texture information in the scene better. Meanwhile, the scheme outperforms state-of-the-art methods in both subjective and objective evaluations.
NSTL
Elsevier