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Diamagnetic Susceptibility of a Hemi-Cylindrical Quantum Dot in the Presence of an Off-Center Donor Atom 偏心给体原子存在下半圆柱形量子点的抗磁化率
Q4 Physics and Astronomy Pub Date : 2023-08-22 DOI: 10.4028/p-KTnG7c
O. Mommadi, S. Chouef, R. Boussetta, M. Hbibi, L. Belamkadem, M. Chnafi, M. El Hadi, A. El Moussaouy, C. M. Duque, C. A. Duque, A. K. El-Miad, F. Falyouni
In this paper, we have studied the electron-donor atom diamagnetic susceptibility confined in a hemi-cylindrical quantum dot (QD). It is analyzed specifically how the impurity location affects diamagnetic susceptibility. The 3D Schrödinger equation in hemi-cylindrical QD was solved using the finite difference method within the effective mass approximation. This is accomplished by performing our system's Hamiltonian in hemi-cylindrical geometry. We have demonstrated that the hemicylindrical size and impurity position have a significant impact on the diamagnetic susceptibility. When the impurity is localized in the center of the nanostructure for the hemi-cylindrical QD, the diamagnetic susceptibility reaches its greatest value.
本文研究了半圆柱形量子点(QD)中电子供体原子的抗磁性。具体分析了杂质位置对抗磁化率的影响。在有效质量近似下,用有限差分法求解了半圆柱形量子点中的三维薛定谔方程。这是通过在半圆柱几何中执行我们系统的哈密顿量来实现的。我们已经证明,半圆柱形尺寸和杂质位置对抗磁化率有显著影响。当杂质位于半圆柱形QD的纳米结构的中心时,抗磁化率达到其最大值。
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引用次数: 0
Simulation Modeling of an Inhomogeneous Medium, in Particular: Round, Triangular, Square Shapes 非均匀介质的模拟建模,特别是圆形、三角形和正方形
Q4 Physics and Astronomy Pub Date : 2023-08-22 DOI: 10.4028/p-sX9LJY
V. Pasternak, A. Ruban, M. Surianinov, S. Shapoval
The article analyzes and develops an algorithm for the operation of the powder backfill process using vibration oscillations. The results of the study make it possible to predict the main properties of particles of any shape. The developed computer simulation model also provides for the superposition of horizontal and vertical oscillations. It should be noted that the difference between them is that the main one for the implementation of horizontal oscillations is the X - coordinate, and for vertical ones – the Y - coordinate. It is also important that the model algorithm provides for simultaneous application of vibration oscillations, which makes it possible to study the influence of the history of the backfill process. It should also be noted that in this scientific study, a number of experiments were conducted, the change in porosity during the imposition of oscillations was studied, and graphs of the obtained experimental dependences were constructed. Porosity from the main parameters of the bunker, in particular: width and height, is also studied. The obtained results made it possible to record the optimal porosity of the backfill with a reliable deviation error (± 1%).
本文分析并开发了一种利用振动振荡进行粉料充填过程运行的算法。这项研究的结果使预测任何形状的粒子的主要性质成为可能。所建立的计算机模拟模型还提供了水平和垂直振荡的叠加。应该注意的是,它们之间的区别在于,实现水平振荡的主要是X坐标,而实现垂直振荡的主要是Y坐标。同样重要的是,该模型算法提供了振动振荡的同时应用,这使得研究回填过程历史的影响成为可能。还应该指出的是,在这项科学研究中,进行了大量的实验,研究了振荡施加期间孔隙率的变化,并构建了得到的实验依赖关系图。孔隙率的主要参数,特别是:宽度和高度,也进行了研究。得到的结果使得记录充填体的最佳孔隙度具有可靠的偏差误差(±1%)。
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引用次数: 0
Slag and Porosity Defective Region Identification in Welding Images Using Computer Vision Techniques 基于计算机视觉技术的焊接图像渣孔缺陷区识别
Q4 Physics and Astronomy Pub Date : 2023-08-22 DOI: 10.4028/p-B2nZYq
R. Rajalakshmi, S. Sivasankaran, Abhinav Basil Shinow, Giridharan Abimannan, C. Boopathy
The process of welding is prone to many defects and these defects can cause the formation of many defective regions. It is necessary to identify the regions of defects as these may cause problems and breakages. In this work, we have proposed a method to detect and identify the defects that are commonly seen in seam welds. Manually identifying the detects is not only error prone and time consuming, most of the defects are not visible to the human eyes. In recent days, X-ray images of weld seam are used for this purpose. In this paper we have applied computer vision techniques and proposed an image processing pipeline to generate a binary segmentation of the image to identify the regions of slag and porosity defect seen in weld seams. From the experimental results on the publicly available dataset, GDX-ray images, it could be observed that, there is a significant improvement in detecting various defects with the proposed approach.
焊接过程容易产生许多缺陷,这些缺陷会导致形成许多缺陷区域。有必要确定缺陷区域,因为这些区域可能会导致问题和损坏。在这项工作中,我们提出了一种检测和识别焊缝中常见缺陷的方法。手动识别检测不仅容易出错且耗时,而且大多数缺陷人眼都看不见。最近几天,焊缝的X射线图像被用于此目的。在本文中,我们应用了计算机视觉技术,并提出了一种图像处理管道来生成图像的二元分割,以识别焊缝中可见的熔渣和气孔缺陷区域。从公开数据集GDX射线图像的实验结果可以看出,使用所提出的方法在检测各种缺陷方面有显著改进。
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引用次数: 0
Visual and IR Inspection Analysis of PV Modules Installed at the Desert Climate of Qatar 卡塔尔沙漠气候条件下光伏组件的目视和红外检测分析
Q4 Physics and Astronomy Pub Date : 2023-08-22 DOI: 10.4028/p-BScNv6
K. Ali, A. Abdallah, M. Kivambe, J. Zaini, M. M. Nauman
This study presents the results of visual and infrared (IR) inspection of photovoltaics (PV) technologies installed at the Qatar environment and energy research institute (QEERI) outdoor test facility (OTF) at Qatar Foundation (Doha, Qatar). Silicon based PV technologies which have been operational in the field since 2014, have been investigated for various failure modes. The visual inspections were carried out for all the PV modules from the backside however, the inspection from the front side was not possible for some modules due to heavy soiling. The visual defects which were identified during this study include, cracking of the back glass, yellowing of the encapsulant material, cracks formation in the back sheet, and pits formation in the back sheet. The visual inspection revealed that around 19 % of the total modules have back sheet cracking and discoloration, 8 % have yellowing of the encapsulant, and around 4 % were having pits in the back sheet. Moreover, one module was detected with back glass cracking. The IR inspection was also done both from front and backside for all the silicon PV modules to detect hot spots. The IR inspection has revealed that hot spots were generated at different locations of the PV modules. 39 % of the modules have hot spots at the location of junction boxes, around 6 % of the modules have hot spots in junction boxes and around 1 % have hot spots at the locations away from junction boxes. The visual and IR inspection has revealed that the dominant failure modes which have been observed for silicon-based technologies at OTF are the hot spots generation at junction boxes and the back sheet cracking, and its yellowing.
本研究介绍了安装在卡塔尔环境和能源研究所(QEERI)室外测试设施(OTF)的光伏(PV)技术的视觉和红外(IR)检测结果。硅基光伏技术自2014年以来一直在现场运行,研究了各种失效模式。从背面对所有光伏组件进行了目视检查,但由于严重污染,无法从正面对某些组件进行检查。在本次研究中发现的视觉缺陷包括:背面玻璃开裂,密封剂材料发黄,背面板形成裂纹,背面板形成凹坑。目视检查显示,大约19%的模块背面有裂缝和变色,8%的封装剂发黄,约4%的背板有凹坑。此外,其中一个模块检测到背面玻璃开裂。对所有硅光伏组件的正面和背面也进行了红外检查,以检测热点。红外检测显示,在光伏组件的不同位置产生了热点。39%的模块在接线盒位置有热点,约6%的模块在接线盒位置有热点,约1%的模块在远离接线盒的位置有热点。目视和红外检测表明,在OTF上观察到的硅基技术的主要失效模式是接线盒上产生的热点和后片的开裂以及变黄。
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引用次数: 0
On Stress-Strain Fields near Mode i Ductile Crack Tip in Elastic-Plastic Fracture 弹塑性断裂i型延性裂纹尖端附近的应力-应变场
Q4 Physics and Astronomy Pub Date : 2023-08-22 DOI: 10.4028/p-qztRb0
S. Bhat, C. Solaimuthu
A mode I, centre crack, in ductile steel plate of finite dimensions is modeled in ANSYS software. Non-linear stress-strain data of steel are used. Plane strain case is adopted. A suitable value of far field tensile stress (pressure) is chosen such that EPFM condition prevails at the crack tip. Process and plastic zones are obtained at the crack tip. Desired values are noted. Areas of high stress and high strain are identified. Validation of void nucleation taking place ahead of crack tip and not exactly at the crack tip and coalescence of voids happening at the crack tip are confirmed from the results. Plots between the distance of desired location from the crack tip and load line stresses and strains are drawn. The plots are in accordance with the expectations.
在ANSYS软件中对有限尺寸延性钢板中的一种模式I,即中心裂纹进行了建模。使用了钢的非线性应力-应变数据。采用平面应变情况。选择合适的远场拉伸应力(压力)值,使得EPFM条件在裂纹尖端盛行。在裂纹尖端获得工艺区和塑性区。记录所需的值。确定了高应力和高应变区域。结果证实了在裂纹尖端之前而不是在裂纹尖端发生的孔隙成核以及在裂纹尖端处发生的孔隙聚结。绘制了所需位置与裂纹尖端的距离与载荷线应力和应变之间的曲线图。这些情节符合预期。
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引用次数: 0
New Concept of Power Generation from TEGs Using the Sun Irradiation and Oil Tanks – Thermal Modeling and Parametric Study 利用太阳辐射和油罐利用TEG发电的新概念——热建模和参数研究
Q4 Physics and Astronomy Pub Date : 2023-08-22 DOI: 10.4028/p-8ZRxu5
Jalal Faraj, G. El Achkar, B. Abdulhay, El Hage Hicham, R. Taher, M. Khaled
In this manuscript, a new concept of power generation from thermoelectric generators TEGs using the sun irradiation and two oil tanks, one hot and one cold, is proposed. It consists of two oil tanks separated by a plate covering several TEGs in series. The oil tank at the bottom of the system constitutes a cold convection condition for the TEGs plate; on the other hand, the upper oil tank accounts for a hot convection condition since its upper surface is transparent and therefore subjected to the sun irradiation that will heat up the oil. To test the feasibility of this concept, an appropriate thermal modeling is developed and associated parametric analysis was carried out. It shows that powers up to 242 W can be generated with a system having a hot oil tank height of 0.2 m along with a width and length of 2 m each.
在这篇文章中,提出了一个新的概念,即使用太阳辐射和两个油箱(一个热油箱和一个冷油箱)的热电发电机TEG发电。它由两个油箱组成,由一块覆盖几个串联TEG的板隔开。系统底部的油箱构成TEG板的冷对流条件;另一方面,由于上油箱的上表面是透明的,因此上油箱处于热对流状态,因此会受到太阳照射,从而使油变热。为了测试这一概念的可行性,开发了一个合适的热模型,并进行了相关的参数分析。它表明,对于具有0.2m的热油箱高度以及每个2m的宽度和长度的系统,可以产生高达242W的功率。
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引用次数: 0
Enhanced Visible Light Photocatalytic Activity of g-C3N4/SiO2@TiO2 Heterojunction Fabricated by Hydrothermal Synthesis 水热合成g-C3N4/SiO2@TiO2异质结增强可见光催化活性
Q4 Physics and Astronomy Pub Date : 2023-08-22 DOI: 10.4028/p-b5m89a
Shota Yuge, Dang Trang Nguyen, Kozo Taguchi
Photocatalysts that can utilize sunlight energy have attracted attention. In this study, g-C 3 N 4 and mesoporous SiO 2 @TiO 2 particles were mixed by hydrothermal synthesis. g-C 3 N 4 was made by a simple method of directly heating melamine. Mesoporous SiO 2 @TiO 2 was prepared using the stover method. These two types of particles were then mixed by hydrothermal synthesis. Hydrothermal synthesis reduced the size of the g-C 3 N 4 particles, and they bound more closely with the TiO 2 particles. The degradation of methylene blue dye by visible light was performed to evaluate the organic degradation of the mixed particles. In addition, the mixed particles were formed into a thin film by the spin-coating method. The film's methylene blue degradation performance and the film's power generation performance in a battery were evaluated. The film showed high convenience in the practical application of photocatalytic degradation of organic pollutants because it can be easily separated from the treated liquid after organic matter degradation.
利用太阳光的光催化剂引起了人们的广泛关注。本研究采用水热合成法将g- c3n4与介孔sio2 @ tio2颗粒混合。采用直接加热三聚氰胺的简单方法制备了g- c3n4。采用秸秆法制备了介孔sio2 @ tio2。然后通过水热合成将这两种类型的颗粒混合。水热合成减小了g- c3n4颗粒的尺寸,使其与tio2颗粒结合更紧密。通过可见光降解亚甲基蓝染料,考察混合颗粒的有机降解效果。此外,通过旋涂法将混合颗粒形成薄膜。对膜的亚甲基蓝降解性能和膜在电池中的发电性能进行了评价。由于该膜在有机物降解后可以很容易地从处理液中分离出来,在光催化降解有机污染物的实际应用中具有很高的便利性。
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引用次数: 0
Theoretical Study of Hydrostatic Pressure and Temperature Effect on a Multi-Quantum well ZnO/Zn1-XMgxO Containing a Staircase Defect for Sensing Application 用于传感应用的含阶梯缺陷的ZnO/Zn1-XMgxO多量子阱静水压力和温度效应的理论研究
Q4 Physics and Astronomy Pub Date : 2023-08-22 DOI: 10.4028/p-7kBVzm
Abdelkader Baidri, F. Elamri, Y. Ben-Ali, F. Falyouni, D. Bria
This work describes a theoretical and analytical study of a temperature and pressure sensor based on II-VI semiconductors with a simple multi-quantum wells (MQWs) structure. The proposed sensor operates by detecting changes in the intensity (transmission coefficient) and energy of localized electronic states inside gaps under external perturbations of hydrostatic pressure and temperature. Specifically, the proposed MQWs structure is ZnO/Zn1-XMgXO with 10 cells, each containing two materials that form the wells and barriers, respectively. The structure is perturbed by a staircase defect consisting of three defects of the same material or geomaterial. The Green function method is used to study the transmittance of the structure, with cleavage and coupling operators employed. The objective of the work is to explore a new type of defect for use in sensing applications such as multi-quantum well sensors. Key parameters for evaluating the sensor's performance include full width at half maximum (FWHM), sensor sensitivity (S), quality factor (QF), detection limit (DL), signal-to-noise ratio (SNR), dynamic range (DR), detection accuracy (DA), the figure of merit (MF), and standard deviation. These parameters can be optimized by adjusting structural parameters such as the thickness of the staircase or material concentration. The study found that a geomaterial staircase defect provides higher sensitivity to pressure and temperature changes. Additionally, the step (δx) of the staircase defect influences the sensitivity of the localized states: with increasing steps, δx improves sensitivity to temperature and decreases sensitivity to pressure.
本工作描述了一种基于简单多量子阱(MQW)结构的II-VI半导体的温度和压力传感器的理论和分析研究。所提出的传感器通过检测在静水压力和温度的外部扰动下间隙内局部电子态的强度(传输系数)和能量的变化来工作。具体而言,所提出的MQW结构是具有10个单元的ZnO/Zn1-XMgXO,每个单元包含分别形成阱和势垒的两种材料。该结构受到由相同材料或地质材料的三个缺陷组成的楼梯缺陷的干扰。采用格林函数方法研究了该结构的透射率,并采用了解理和耦合算子。这项工作的目的是探索一种新型的缺陷,用于多量子阱传感器等传感应用。评估传感器性能的关键参数包括半峰全宽(FWHM)、传感器灵敏度(s)、品质因数(QF)、检测极限(DL)、信噪比(SNR)、动态范围(DR)、检测精度(DA)、优值(MF)和标准偏差。这些参数可以通过调整结构参数来优化,例如楼梯的厚度或材料浓度。研究发现,岩土材料楼梯缺陷对压力和温度变化具有更高的敏感性。此外,阶梯缺陷的阶跃(δx)影响局部状态的灵敏度:随着阶跃的增加,δx提高了对温度的灵敏度,降低了对压力的灵敏度。
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引用次数: 1
Computer Modeling of Inhomogeneous Media Using the Abaqus Software Package 用Abaqus软件包进行非均匀介质的计算机建模
Q4 Physics and Astronomy Pub Date : 2023-08-22 DOI: 10.4028/p-XTi7h9
V. Pasternak, A. Ruban, N. Zolotova, Oleg Suprun
The article describes in detail the process of modelling an inhomogeneous environment. It should be noted that the modelling of a rectangular plate is justified by the Kirchhoff – Love methods. A special feature of this simulation with the intervention of the Abaqus software package was the setting of different steps at different points in time. We also constructed H-adaptive schemes of finite element methods and their triangulation with different steps and with pre-guaranteed accuracy. When adapting the grid at the places of the greatest errors, a local thickening of the Triangle grid was observed, which ultimately determines that the structure of the desired solutions contains features in the edges of the vertices of the fixed edge. We also found that the proximity to linear growth of the number of nodes and finite elements in the initial stages of adaptation slows down their growth in the final stages. It should also be noted that the proposed H-adaptive schemes of ITU using the Abaqus software package with pre-guaranteed accuracy of calculating approximations showed satisfactory results, since they obtained a final deviation error of 2%. Also, a detailed description of the step-by-step adaptation results allowed us to generate the reliability of the proposed schemes with different steps.
本文详细描述了非同构环境建模的过程。应该指出的是,矩形板的建模是由Kirchhoff - Love方法证明的。在Abaqus软件包的干预下,该模拟的一个特殊功能是在不同的时间点设置不同的步骤。我们还构建了h -自适应的有限元方法及其三角剖分方案,采用不同的步骤和预先保证的精度。当在误差最大的地方调整网格时,观察到三角形网格的局部增厚,最终确定所需解的结构包含固定边的顶点边缘中的特征。我们还发现,在适应的初始阶段,节点和有限元的数量接近线性增长,减缓了它们在最终阶段的增长。还应该指出的是,ITU使用Abaqus软件包提出的h -自适应方案,在预先保证计算近似精度的情况下,获得了令人满意的结果,因为它们获得了2%的最终偏差误差。此外,对逐步适应结果的详细描述使我们能够通过不同的步骤生成所提出方案的可靠性。
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引用次数: 0
Numerical Model for the Analysis of Fluid-Structure Interaction Problems with Cable Coupling 考虑缆索耦合的流固耦合问题的数值模型分析
Q4 Physics and Astronomy Pub Date : 2023-07-14 DOI: 10.4028/p-tQuqm7
Mateus Guimarães Tonin, A. L. Braun
The present work proposes the development of numerical tools for solving fluid-structure interaction (FSI) problems where the structure is coupled with cables. For the numerical treatment of fluids in incompressible flow, the Navier-Stokes and continuity equations are discretized using a semi-implicit version of the characteristic-based split (CBS) method in the context of the finite element method (FEM), where linear tetrahedral elements are used. In the presence of moving structures, the flow equations are described through an arbitrary Lagrangian-Eulerian (ALE) formulation and a numerical scheme of mesh movement is adopted. The structure is treated through a three-dimensional rigid body approach and the cable through an elastic model with geometric nonlinearity and spatial discretization by the nodal position finite element method (NPFEM). The system of equations of motion can be temporally discretized using the implicit Newmark and generalized-α methods and a partitioned coupling scheme is used taking into account fluid-structure and cable-structure couplings. The algorithms proposed here are verified using numerical applications.
目前的工作提出了数值工具的发展,以解决流固相互作用(FSI)问题,其中结构与电缆耦合。对于不可压缩流体的数值处理,在有限元方法(FEM)的背景下,使用基于特征的分裂(CBS)方法的半隐式版本对Navier-Stokes方程和连续性方程进行离散,其中使用线性四面体单元。在存在运动结构的情况下,流动方程采用任意拉格朗日-欧拉(ALE)公式描述,网格运动采用数值格式。采用节点位置有限元法(NPFEM)对结构进行三维刚体分析,对索进行几何非线性和空间离散化的弹性模型分析。采用隐式Newmark方法和广义-α方法对运动方程系统进行时间离散,并采用考虑流固耦合和索-结构耦合的分块耦合方案。本文提出的算法通过数值应用进行了验证。
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引用次数: 0
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