scholarly journals Effect of small anisotropy and absorption on metamaterial applications: “non-ideal” features of propagation and tunneling of electromagnetic waves

2018 ◽  
Vol 5 ◽  
pp. 1 ◽  
Author(s):  
Evgenii Starodubtsev
Keyword(s):  
Comparative Analysis ◽  
Electromagnetic Waves ◽  
Wave Attenuation ◽  
Small Deviations ◽  
Material Parameters ◽  
Dispersion Equations ◽  
Local Material ◽  
Traditional Approaches ◽  
Electromagnetic Metamaterials ◽  
Small Anisotropy

For cases of isotropic, uniaxial, and biaxial electromagnetic metamaterials (MM), a comparative analysis of the effect of small deviations of local material parameters from “ideal” values on the realization of MM applications (“zero” media, the Veselago-Pendry superlens) has been carried out. On the basis of the detailed investigation of the solutions of dispersion equations, it is established that even a very small dielectric and (or) magnetic anisotropy of a general form is the universal “non-ideal” factor determining (to a much greater extent than small losses) the operability of those MM applications where the wave misphasing in the effective medium is undesirable. The characteristics of wave attenuation in the absorbing isotropic and weakly anisotropic MM are mainly comparable for the applications. Limitations of the traditional approaches using the second-order curves (or surfaces) for analytic modeling of the absorbing MM dispersion equations are shown.

The role of physical factors in the complex therapy of patients with rheumatoid arthritis

1985 ◽  
Vol 66 (4) ◽  
pp. 318-318
Author(s):  
L. V. Chernetsova ◽  
A. G. Ibragimova
Keyword(s):  
Rheumatoid Arthritis ◽  
Comparative Analysis ◽  
Drug Therapy ◽  
Electromagnetic Waves ◽  
Physical Factors ◽  
Complex Therapy ◽  
Decimeter Range

The comparative analysis of treatment of 76 patients with rheumatoid arthritis using electromagnetic waves of the decimeter range and lithium electrophoresis, depending on the activity of the process and the type of drug therapy.

scholarly journals Challenges for child support schemes: Accounting for shared care and complex families

2018 ◽  
Vol 28 (3) ◽  
pp. 211-223 ◽  
Author(s):  
Elke Claessens ◽  
Dimitri Mortelmans
Keyword(s):  
Comparative Analysis ◽  
Gender Roles ◽  
Gender Equality ◽  
Child Support ◽  
Family Care ◽  
Shared Care ◽  
Family Policies ◽  
Policy Models ◽  
Sole Custody ◽  
Traditional Approaches

The increasing prevalence of shared care and complex families is challenging traditional approaches to child support determination based on the ‘classic’ two-parent, sole custody, post-divorce family. This article provides a comparative analysis of how these challenges are being addressed in the child support schemes of eight different countries and evaluates these approaches in the light of family policies on gender equality in family care. We find great diversity in the incorporation of shared care and complex families, which is not clearly connected to existing ideal typical policy models on gendered family care. However, child support schemes, at least partially, seem to translate into assumptions concerning gender roles and general policy aims concerning gender equality. In order to better understand how countries accommodate the challenges arising from the modern post-separation family, gender equality seems a vital consideration to take into account.

scholarly journals Дважды отрицательные среды на основе антиферромагнитных полупроводников для терагерцевого диапазона частот

2022 ◽  
Vol 48 (5) ◽  
pp. 39
Author(s):  
С.В. Гришин ◽  
А.В. Богомолова ◽  
С.А. Никитов
Keyword(s):  
Electromagnetic Waves ◽  
Theoretical Study ◽  
The Other ◽  
Terahertz Range ◽  
Dispersion Characteristics ◽  
Gyrotropic Medium ◽  
Material Parameters

The paper presents the results of a theoretical study of the dispersion characteristics of electromagnetic waves (EMW) existing in a transversely magnetized antiferromagnetic (AFM) semiconductor with loss. An AFM semiconductor is an infinite bi-gyrotropic medium, the effective material parameters of which are twice negative in several frequency ranges. It was found that these frequency regions are in the terahertz range and there are four backward EMEs in them, two of which are TE waves, and the other two are TM waves.

scholarly journals Cognitive Political Discourse Analysis: Creative Translation Teaching Case

2020 ◽  
pp. 363-374
Author(s):  
Irina V. Ubozhenko
Keyword(s):  
Decision Making ◽  
Discourse Analysis ◽  
Comparative Analysis ◽  
Political Discourse ◽  
Popular Science ◽  
Literary Texts ◽  
Decision Making Process ◽  
Teaching Case ◽  
Political Discourse Analysis ◽  
Traditional Approaches

The paper elaborates on teaching creative translation and analyses the case of cognitive political discourse and its translation decision-making process. The research is based on the example of modern political terminology and non-equivalent political context vocabulary. Unlike traditional approaches that mostly relate creativity to literary texts interpretation, the study deals with the didactic methodology of comprehending and translating foreign academic and popular science sources. The cognitive comparative analysis of political concepts in their context use – both in English and Russian discourse – is aimed at professional explanation of motivation in selecting and choosing translation equivalents. The algorithm of designing an associative thesaurus referred to cognitive signs of lexical marking has been a major investigation tool of political discourse analysis represented in the paper as well as the foundation for the original creative model of translation performance and didactics

scholarly journals Comparative Analysis of Automatic Exudate Detection between Machine Learning and Traditional Approaches

2009 ◽  
Vol E92-D (11) ◽  
pp. 2264-2271
Author(s):  
Akara SOPHARAK ◽  
Bunyarit UYYANONVARA ◽  
Sarah BARMAN ◽  
Thomas WILLIAMSON
Keyword(s):  
Machine Learning ◽  
Comparative Analysis ◽  
Traditional Approaches

Dispersion of dipolar electromagnetic waves in a radially inhomogeneous axially magnetized plasma column

1997 ◽  
Vol 58 (4) ◽  
pp. 633-646 ◽  
Author(s):  
I. GHANASHEV ◽  
I. ARESTOVA ◽  
E. TATAROVA ◽  
I. ZHELYAZKOV ◽  
Sv. STOYKOV
Keyword(s):  
Plasma Density ◽  
Plasma Column ◽  
Electromagnetic Waves ◽  
Wave Attenuation ◽  
Magnetized Plasma ◽  
Plasma Inhomogeneity ◽  
Polarized Waves ◽  
Plasma Density Profile ◽  
Order Of Magnitude ◽  
Radially Inhomogeneous

The wavelengths and attenuation coefficients of dipolar left and right-hand circularly polarized waves in a radially inhomogeneous axially magnetized plasma column are computed by means of step approximation of the radial plasma density profile. A comparison with theoretical results assuming radial plasma homogeneity shows that the radial plasma inhomogeneity is significant for wave propagation. In particular, it facilitates the occurrence of backward waves and increases by up to one order of magnitude the wave attenuation coefficient compared with a homogeneous plasma column having the same average plasma density.

scholarly journals Eigen damping constant of spin waves in ferromagnetic nanostructure

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Indra Purnama ◽  
Jung-Hwan Moon ◽  
Chun-Yeol You
Keyword(s):  
Spin Wave ◽  
Electromagnetic Waves ◽  
Spin Waves ◽  
Superposition Principle ◽  
Material Damping ◽  
Comprehensive Investigation ◽  
Material Parameters ◽  
Typical Material ◽  
The Waves

Abstract Though varying in nature, all waves share traits in a way that they all follow the superposition principle while also experiencing attenuation as they propagate in space. And thus it is more than common that a comprehensive investigation of one type of wave leads to a discovery that can be extended to all kinds of waves in other fields of research. In the field of magnetism, the wave of interest corresponds to the spin wave (SW). Specifically, there has been a push to use SWs as the next information carriers similar to how electromagnetic waves are used in photonics. At present, the biggest impediment in making SW-based device to be widely adapted is the fact that the SW experiences large attenuation due to the large damping constant. Here, we developed a method to find the SW eigenmodes and show that their respective eigen damping constants can be 40% smaller than the typical material damping constant. From a bigger perspective, this finding means that the attenuation of SW and also other types of waves in general is no more constrained by the material parameters, and it can be controlled by the shape of the waves instead.

scholarly journals The Effectiveness of Online Education during Covid 19 Pandemic—A Comparative Analysis between the Perceptions of Academic Students and High School Students from Romania

2021 ◽  
Vol 13 (9) ◽  
pp. 5311
Author(s):  
Gina Ionela Butnaru ◽  
Valentin Niță ◽  
Alexandru Anichiti ◽  
Geanina Brînză
Keyword(s):  
High School Students ◽  
Comparative Analysis ◽  
Online Education ◽  
Online Courses ◽  
Traditional Education ◽  
Learning Activities ◽  
Learner Satisfaction ◽  
School Students ◽  
Online Tools ◽  
Traditional Approaches

The COVID-19 pandemic has disrupted normal activities such as going to school, moving education online. Based on data gathered through a survey (N = 784), this paper analyses students’ perceptions regarding the effectiveness of online education in a period when this type of education is the only available option. Although several studies suggest that online education can be as effective as traditional education which requires attendance, few studies have focused on learner satisfaction with online instruction, particularly in the transition to online learning from traditional approaches. The results indicate that students react differently to online education, and their reaction is based on their proficiency in using online tools, their ability to technically access online courses, and the instructors’ manner in conducting learning activities.

Sign in / Sign up

Export Citation Format

Share Document