Cross Sections for Absorption and Scattering of Electromagnetic Radiation by Ensembles of Metal Nanoparticles of Different Shapes

2021 ◽  
Vol 122 (10) ◽  
pp. 941-949
Author(s):  
A. V. Korotun ◽  
N. I. Pavlyshche
Keyword(s):  
Electromagnetic Radiation ◽  
Metal Nanoparticles ◽  
Cross Sections ◽  
Different Shapes

scholarly journals Comparison of Screening Configurations for the Mitigation of Voltages and Currents Induced on Pipelines by HVAC Power Lines

Energies ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3855
Author(s):  
Arturo Popoli ◽  
Leonardo Sandrolini ◽  
Andrea Cristofolini
Keyword(s):  
Finite Element Analysis ◽  
Cross Sections ◽  
Detrimental Effect ◽  
Power Line ◽  
Skin Depth ◽  
Power Lines ◽  
Element Analysis ◽  
3D Finite Element ◽  
Different Shapes ◽  
High Magnetic Permeability

In this paper, a strategy for reducing the electromagnetic interferences induced by power lines on metallic pipelines is proposed and numerically investigated. The study considers a set of steel conductors interposed between the power line and the pipeline. Different shapes of conductor cross sections and different magnetic permeabilities are considered, to identify the solution exhibiting the greatest mitigation efficiency for the same amount of material. The investigation is carried out by means of a quasi-3D finite element analysis. Results show that the main mechanism responsible for the mitigation is constituted by the currents induced in the screening conductors by the power line. Hence, a high magnetic permeability can have a detrimental effect since it reduces the skin depth to values below the size of the screening conductor. In this case, a reduction of the screening current and in the mitigation efficiency is observed. Nevertheless, the study shows that the use of strip-shaped screening conductors allows the employment of cheaper magnetic materials without compromising the mitigation efficacy of the screening conductors.

On-demand shape and size purification of nanoparticle based on surface area

Nanoscale ◽  
2014 ◽  
Vol 6 (21) ◽  
pp. 13145-13153 ◽  
Author(s):  
Renming Liu ◽  
Jian-Hua Zhou ◽  
Zhang-Kai Zhou ◽  
Xueqin Jiang ◽  
Jiaming Liu ◽  
...  
Keyword(s):  
Metal Nanoparticles ◽  
Surface Area ◽  
Purification Method ◽  
On Demand ◽  
Different Shapes ◽  
Centrifugation Method ◽  
Shape And Size

To overcome the deficiencies of the traditional centrifugation method in on-demand purification of metal nanoparticles, we developed a surface-based purification method which can separate particles with the same mass but different shapes.

scholarly journals Modeling the Effects of Electromagnetic Radiation on Natural Aerosols

2019 ◽  
pp. 64-79
Author(s):  
Irina Krivenko ◽  
Marina Smirnova
Keyword(s):  
Electromagnetic Radiation ◽  
Cross Sections ◽  
Power Distribution ◽  
The Finite Element Method ◽  
Dispersed Particles ◽  
Intensity Vector ◽  
The Subject ◽  
Natural Aerosols ◽  
Thermal Sources ◽  
Uniform Composition

The subject of research is dispersed systems that absorb the incident electromagnetic radiation, which initiates the process of heat transfer in them. 1) Systems consisting of two interacting spheres and two parallel cylinders (convergence of two particles suspended, for example, in air, are more likely than convergence of N particles (N > 2) are considered. Based on the Mie theory, analytical solutions are obtained for the components of the electric field intensity vector inside the dispersed particles, which were used to calculate the power distribution of thermal sources over their cross sections. 2) non-uniform composition of a spherical particle. For this case, calculations are made by the finite element method.

OPTIMIZATION OF TREE STRUCTURES WITH RHOMBIC GRIDS

2021 ◽  
pp. 54-68
Author(s):  
А.С. Марутян
Keyword(s):  
Cross Sections ◽  
Communication Systems ◽  
Technical Solution ◽  
Building Structures ◽  
Tree Structures ◽  
Different Shapes ◽  
Support Conditions ◽  
Necessary And Sufficient ◽  
Patent Examination ◽  
Rhombic Lattice

Представлено конструктивно-компоновочное решение стержней Y-образных и Ψ-образных очертаний в фермах с ромбической решеткой или фермах с ромбической решеткой и полустойками (полуподвесками), техническая новизна которого подтверждена результатами патентной экспертизы. Универсальность этого решения для ферменных конструкций обеспечивает ту эффективность, с какой оно применимо к грузовым верхним поясам, грузовым нижним поясам или грузовым верхним и нижним поясам одной и той же решетки. Повышена степень унификации фермы из прямоугольных гнутосварных профилей (профильных труб) за счет использования в верхнем поясе форм и наружных габаритов поперечных сечений, принятых для нижнего пояса. При этом ресурсы несущей способности разнятся между ними в пределах однопроцентного порога, что обеспечивает необходимую и достаточную равнопрочность обоих поясов для их более рациональной унификации. Узловые соединения стержней разных очертаний с верхними поясами позволяют оптимизировать опорные условия настилов и прогонов с уменьшением размеров их грузовых площадей. Возрастание общего количества прогонов приводит к снижению их суммарной массы и массы кровельного ограждения, что весьма актуально для вариантного и оптимального проектирования строительных конструкций с учетом риска лавинообразного обрушения. Выявлена перспективность применения нового технического решения в составе несущих и связевых систем различных зданий и сооружений. The structural and layout solution of rods of Y-shaped and Ψ-shaped outlines in trusses with a rhombic lattice or trusses with a rhombic lattice and half-posts (half-suspensions) is presented, the technical novelty of which is confirmed by the results of patent examination. The versatility of this truss solution is as effective as it is for load tops, load bottoms, or load tops and bottoms of the same grid. The degree of unification of the truss of rectangular bent-welded profiles (shaped pipes) has been increased due to the use in the upper chord of the forms and outer dimensions of the cross-sections adopted for the lower chord. At the same time, the resources of the bearing capacity differ between them within a one- percent threshold, which ensures the necessary and sufficient equal strength of both belts for their more rational unification. Nodal connections of rods of different shapes with the upper chords allow to optimize the support conditions of decks and purlins with a decrease in the size of their cargo areas. An increase in the total number of runs leads to a decrease in their total mass and the mass of the roofing, which is very important for the variant and optimal design of building structures, taking into account the risk of an avalanche collapse. The prospect of using a new technical solution in the composition of bearing and communication systems of various buildings and structures has been revealed.

scholarly journals Metal Nanoparticles as Novel Antifungal Agents for Sustainable Agriculture: Current Advances and Future Directions

2021 ◽  
Vol 7 (12) ◽  
pp. 1033
Author(s):  
Aida R. Cruz-Luna ◽  
Heriberto Cruz-Martínez ◽  
Alfonso Vásquez-López ◽  
Dora I. Medina
Keyword(s):  
Metal Nanoparticles ◽  
Antifungal Agents ◽  
Good Alternative ◽  
Phytopathogenic Fungi ◽  
Synthesis Methods ◽  
Cu Nanoparticles ◽  
Future Directions ◽  
Detailed Review ◽  
Antifungal Activities ◽  
Different Shapes

The use of metal nanoparticles is considered a good alternative to control phytopathogenic fungi in agriculture. To date, numerous metal nanoparticles (e.g., Ag, Cu, Se, Ni, Mg, and Fe) have been synthesized and used as potential antifungal agents. Therefore, this proposal presents a critical and detailed review of the use of these nanoparticles to control phytopathogenic fungi. Ag nanoparticles have been the most investigated nanoparticles due to their good antifungal activities, followed by Cu nanoparticles. It was also found that other metal nanoparticles have been investigated as antifungal agents, such as Se, Ni, Mg, Pd, and Fe, showing prominent results. Different synthesis methods have been used to produce these nanoparticles with different shapes and sizes, which have shown outstanding antifungal activities. This review shows the success of the use of metal nanoparticles to control phytopathogenic fungi in agriculture.

Metal nanoparticles of different shapes influence on optical properties of multilayered biological tissues

2015 ◽  
Author(s):  
Maria N. Kholodtsova ◽  
Iulia S. Samsonova ◽  
Walter Blondel ◽  
Victor B. Loschenov
Keyword(s):  
Optical Properties ◽  
Metal Nanoparticles ◽  
Biological Tissues ◽  
Different Shapes

scholarly journals Averaged optical characteristics of an ensemble of metal nanoparticles

2019 ◽  
Vol 33 (18) ◽  
pp. 1950188
Author(s):  
P. M. Tomchuk ◽  
V. N. Starkov
Keyword(s):  
Metal Nanoparticles ◽  
Optical Conductivity ◽  
Field Vector ◽  
Metal Nanoparticle ◽  
Optical Characteristics ◽  
Nanoparticle Size ◽  
Nanoparticle Shape ◽  
Combined Application ◽  
Different Shapes ◽  
The Magnetic Field

A theory for the averaged optical characteristics of an ensemble of metal nanoparticles with different shapes has been developed. The theory is applicable both for the nanoparticle size at which the optical conductivity of the particle is a scalar and for the nanoparticle size at which the optical conductivity should be considered as a tensor. The averaged characteristics were obtained taking into account the influence of nanoparticle shape on the depolarization coefficient and the components of the optical conductivity tensor. The dependences of magnetic absorption by a spheroidal metal nanoparticle on the ratio between its curvature radii and the angle between the spheroid symmetry axis and the magnetic field vector were derived and theoretically considered. An original variant of the distribution function for nanoparticle shapes, which is based on the combined application of the Gaussian and “hat” functions, was proposed and analyzed.

Sign in / Sign up

Export Citation Format

Share Document