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 Дважды отрицательные среды на основе антиферромагнитных метаматериалов для терагерцевого диапазона частот

2021 ◽  
Vol 47 (18) ◽  
pp. 32
Author(s):  
С.В. Гришин ◽  
М.Д. Амельченко ◽  
Ю.П. Шараевский ◽  
С.А. Никитов
Keyword(s):  
Periodic Structure ◽  
Theoretical Study ◽  
Terahertz Range ◽  
Two Dimensional ◽  
Dispersion Characteristics ◽  
Thin Conducting ◽  
Study Results

The paper presents the theoretical study results of the dispersion characteristics of electromagnet-ic waves existing in antiferromagnetic (AFM) metamaterial. The AFM metamaterial consists of a transversely magnetized antiferromagnet, inside of which a two-dimensional periodic structure of thin conducting wires surrounded by insulators is placed. It has been established that the AFM metamaterial has two frequency ranges, in which there are backward waves, and the material pa-rameters of the medium are twice negative. The indicated areas are located in the terahertz range.

scholarly journals Treatment outcomes in patients with multiple and concomitant trauma managed with minimally invasive osteosynthesis technologies and electromagnetic waves of the terahertz range

2021 ◽  
Vol 27 (1) ◽  
pp. 6-12
Author(s):  
S.Yu. Lukin ◽  
◽  
Yu.P. Soldatov ◽  
A.N. Diachkov ◽  
◽  
...  
Keyword(s):  
Immune System ◽  
Minimally Invasive ◽  
Electromagnetic Waves ◽  
Bone Fractures ◽  
Damage Control ◽  
Medullary Canal ◽  
Terahertz Range ◽  
Control Group ◽  
Minimally Invasive Osteosynthesis ◽  
Group I

Purpose To assess the effectiveness of minimally invasive technologies of osteosynthesis and electromagnetic waves of the terahertz range in patients with multiple and concomitant trauma. Materials and methods The process of rehabilitation was studied in 513 patients with polytrauma of varying severity which was more than 26 points on the ISS scale. The patients were diagnosed with 545 injuries of different organs and systems. All patients with severe concomitant and multiple trauma were divided into 3 groups: Group I of controls, treated in1995–2001, consisted of 269 patients whose treatment was conservative and aggressive (surgical, with the use of plating or intramedullary osteosynthesis); Group II was the experimental study group consisting of subgroup A of 202 patients treated in 2002–2009 in whom “damage control” concept was applied and subgroup B of 42 patients treated in 2010–2017 using the damage control tactics and new minimally invasive methods of treatment and devices (non-invasive lung ventilation in intensive care for fat embolism; rational osteosynthesis in closed chest trauma; minimally invasive guided method of transosseous osteosynthesis, including the use of fixators with hydroxyapatite coating; rational surgical approach to pelvic bones; universal guide for reaming the medullary canal) and exposure to electromagnetic waves of the terahertz range (EMWTHR)of the xiphoid process of the sternum to stimulate the immune system. Results It was revealed that the use of minimally invasive, low-traumatic methods of treating bone fractures in severe polytrauma and methods stimulating the immune system and tissue regeneration (subgroup II B) contributed to an improvement of anatomical and functional results of treatment by 1.3 times compared with the control group. The quality of life of patients in this group, in comparison with the control group, was 1.6 times higher for injuries of the upper limb and 1.9 times higher for injuries of the lower limb. An integral analysis of the effectiveness of the treatment revealed a reliable increase in the effectiveness to a satisfactory level. Conclusion The use of EMWTHR in the complex treatment of such patients is a promising method for stimulating hematological and immunological processes. The first results described in the literature are optimistic.

scholarly journals AN ANALYSIS OF GEOMETRIC ELEMENTS OBSERVED IN BANDUNG’S SALMAN MOSQUE

2017 ◽  
Vol 1 (04) ◽  
pp. 486-502
Author(s):  
Renate Arlene; Bachtiar Fauzy
Keyword(s):  
Research Study ◽  
Theoretical Study ◽  
Modern Architecture ◽  
The Other ◽  
Research Outcome ◽  
Geometric Elements

Abstract- The Salman Mosque was constructed in the era of modern architecture guided by geometric elements. Geometric elements enable architects to easily design with accurate measurement. These geometric elements were applied to the Salman Mosque by Achmad Noe’man. The applications of these geometric elements were made to the roof, walls and floor of the Salman Mosque building. The purpose of this paper is study the aspects of geometric elements within this research. The other purpose is to study the application of geometric elements to the Salman Mosque in Bandung. The theories behind this research are the ones concerning geometric elements, modern types of architecture, Mosque architecture, structuring principles, and archetypes. The method used to conduct the research is the research object analysis, in this case of theSalman Mosque. This paper discusses the background, formulation of the problem, purpose, utility, method, theoretical study, object data and research object analysis, as well as the ultimate research conclusion and suggestion. The benefits of the research outcome that can be derived from this research study are yielding knowledge concerning the application of geometric elements to a Mosque building in Indonesia as well as producing recommendations for the design of geometric elements in Indonesia. Keywords: geometric elements; roof, wall, and floor; Salman Mosque Bandung

scholarly journals Collaborative care in health institutions: the nurse as integrator

2014 ◽  
Vol 23 (4) ◽  
pp. 1145-1152 ◽  
Author(s):  
Vera Regina Waldow
Keyword(s):  
Collaborative Care ◽  
Health Professionals ◽  
Theoretical Study ◽  
Collaborative Work ◽  
Family Members ◽  
The Other ◽  
Nursing Team ◽  
Health Institutions

This theoretical study aimed to share and propose a vision regarding collaborative work in the area of health, in the perspective of care. The nurse is considered the leader in this process, responsible for spreading and motivating principles of care among the nursing team and the other health professionals; the goal is collaborative work impacting positively on the relationships between the various professionals, patients and family members, resulting in an atmosphere where behaviors of care, such as solidarity, cooperation and respect, may be shown, contributing to competent and sensitive care.

Technical Perspective of Authentication Policy Extension for the Adaptive Social Services and e-Health Care Management

2013 ◽  
pp. 719-726 ◽  
Author(s):  
Masakazu Ohashi ◽  
Nat Sakimura ◽  
Mituo Fujimoto ◽  
Mayumi Hori ◽  
Noriko Kurata
Keyword(s):  
Health Care ◽  
Public Sector ◽  
Private Sector ◽  
Social Services ◽  
Private Information ◽  
Theoretical Study ◽  
Health Care Management ◽  
Health Data ◽  
The Other ◽  
Federated Identity

The substantiative study of private information box project of Japanese e-Government proved the effectiveness of the New Authentication Extension Technology to combine different social infrastructures to create new Secure services between Public Sector and Private Sector (Citizen). However, there are still issues to cope with outside of the realm of technology including accountability of each participants and the level of the service, OpenID and SAML are key federated identity protocols. Both SAML and OpenID define mechanisms in support of expressing assurance information on protocol messages, Authentication Context and the Provider Authentication Policy Extension (PAPE), respectively. In deployment scenarios that require proxying from one of the protocols to the other, it becomes necessary to map to and from the corresponding assurance mechanisms. This chapter provides theoretical study of Social and e-Health Data secure exchange methodology on this mapping and related issues.

The New Messengers

2021 ◽  
pp. 36-52
Author(s):  
Gianfranco Bertone
Keyword(s):  
Gravitational Waves ◽  
Nobel Prize ◽  
Direct Contact ◽  
Thin Shell ◽  
Electromagnetic Waves ◽  
Scientific Community ◽  
The Other ◽  
The Moon ◽  
New Era ◽  
The Universe

I present the momentous discovery of gravitational waves, announced in 2016, starting from a confused Einstein who in 1936 tries to convince the scientific community that gravitational waves cannot exist (!), and then illustrating the extraordinary insights and breakthroughs that led 2017 Nobel Prize winners B. Barish, K. Thorne and R. Weiss to open an entirely new window on the Universe. This achievement has marked the beginning of a new era in science, and upcoming experiments have the potential to truly revolutionize our understanding of the Universe. Accounts of the perception of extra-terrestrial reality with senses beyond sight, such as those offered by astronauts who have been on the Moon, are exceedingly rare. That is hardly unsurprising: touch and taste require direct contact, while hearing and smell operate only over short distances, and are in any case confined to the Earth’s thin shell of atmosphere. Sight, on the other hand, allows us to collect the electromagnetic waves emitted by extraordinarily remote celestial objects.

APPLICATIONS IN THE ADVANCED TRANSPORTATION SYSTEM AND IMPACT ON SUPERCONDUCTIVITY INDUSTRY OF HTSM

2005 ◽  
Vol 19 (01n03) ◽  
pp. 427-429
Author(s):  
Y. P. ZHANG ◽  
Y. ZHAO
Keyword(s):  
Information Technology ◽  
High Temperature ◽  
Large Scale ◽  
Theoretical Study ◽  
High Temperature Superconductivity ◽  
Transportation System ◽  
The Other ◽  
Development Potential ◽  
Social Demand ◽  
Transportation Technologies

As the information technology grows up and its application penetrates into every area of this world, how to faster and more efficiently transport people and goods is becoming the new social demand, which indicates a new revolution on advanced transportation technology being brewed. High-temperature Superconductivity Maglev (HTSM) is one with the best development potential among most transportation technologies. It could be used in many advanced transportation fields, overcoming the key contradiction and shortcoming of the current transportation patterns such as train, automobile and airplane. On the other hand, HTSM will promote theoretical study and technology exploitation on superconductivity. HTSM's applications in a large scale will bring up profound effect on the forming and development of the superconductivity industry.

Numerical Implementation and Finite Element Analysis of Anisotropic Hyperelastic Biomaterials - Influence of Fibers Orientation

2013 ◽  
Vol 554-557 ◽  
pp. 2414-2423 ◽  
Author(s):  
Rachid Djeridi ◽  
Mohand Ould Ouali
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Fiber Orientation ◽  
Mechanical Response ◽  
Theoretical Study ◽  
Constitutive Law ◽  
Anisotropic Behavior ◽  
Element Analysis ◽  
Material Parameters ◽  
Fibers Orientation

Modeling anisotropic behavior of fiber reinforced rubberlike materials is actually of a great interest in many industrials sectors. Indeed, accurately description of the mechanical response and damage of such materials allows the increase of the lifecycle of these materials which generally evolve under several environment conditions. In this paper theoretical study and finite element analysis of anisotropic biomaterials is presented. The mechanical model adopted to achieve this study has been implemented into the finite element code Abaqus using an implicit scheme. This constitutive law has been utilized to perform some numerical simulations. The material parameters of the model have been determined by numerical calibration. One fiber family is considered in this work. Effects of the fiber orientation on the mechanical response and stiffness change of biomaterial is studied. Both the compressible and incompressible states have been taken into account. The results show firstly the capability of the model to reproduce the known results and that optimal fiber orientation can be found.

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.

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