A Numerically Efficient Technique for the Analysis of Metamaterial- and Metasurface-based Antennas

2021 ◽  
Vol 36 (4) ◽  
pp. 363-372
Author(s):  
Abdelkhalek Nasri ◽  
Raj Mittra ◽  
Asim Ghalib ◽  
Bandar Hakim ◽  
Hatem Rmili
Keyword(s):  
Present Approach ◽  
Efficient Technique ◽  
New Approach ◽  
Long Time ◽  
Em Simulation ◽  
Recent Attention ◽  
Principal Advantage ◽  
Simulation Codes

Metasurface-based antennas have received considerable recent attention in recent years because they are not only useful for designing new antennas, but for improving the performance of legacy designs as well. However, systematically designing these antennas is challenging because the antennas are usually multiscale in nature and they typically require a long time when simulated by using commercial solvers. In this work, we present a new approach for analyzing antennas that utilize Metasurfaces (MTSs) and Metamaterial (MTMs). The proposed method departs from the widely used technique based on an anisotropic impedance representation of the surface and relies on an equivalent medium approach instead. The principal advantage of the proposed approach is that such an equivalent medium representation can be conveniently inserted directly in commercial EM solvers, circumventing the need to develop special numerical EM simulation codes to handle metasurfaces. Several illustrative examples are presented in the paper to demonstrate the efficacy of the present approach when simulating MTS- and MTMbased antennas.

Inter-country inequality as a dynamic process and the problem of post-industrial development

2018 ◽  
pp. 5-29 ◽  
Author(s):  
L. M. Grigoryev ◽  
V. A. Pavlyushina
Keyword(s):  
Economic Growth ◽  
Political Institutions ◽  
Industrial Development ◽  
Modern World ◽  
New Approach ◽  
Development Level ◽  
The World ◽  
Long Time ◽  
The Difference ◽  
Post Industrial

The phenomenon of economic growth is studied by economists and statisticians in various aspects for a long time. Economic theory is devoted to assessing factors of growth in the tradition of R. Solow, R. Barrow, W. Easterly and others. During the last quarter of the century, however, the institutionalists, namely D. North, D. Wallis, B. Weingast as well as D. Acemoglu and J. Robinson, have shown the complexity of the problem of development on the part of socioeconomic and political institutions. As a result, solving the problem of how economic growth affects inequality between countries has proved extremely difficult. The modern world is very diverse in terms of development level, and the article offers a new approach to the formation of the idea of stylized facts using cluster analysis. The existing statistics allows to estimate on a unified basis the level of GDP production by 174 countries of the world for 1992—2016. The article presents a structured picture of the world: the distribution of countries in seven clusters, different in levels of development. During the period under review, there was a strong per capita GDP growth in PPP in the middle of the distribution, poverty in various countries declined markedly. At the same time, in 1992—2016, the difference increased not only between rich and poor groups of countries, but also between clusters.

scholarly journals Online Social Gambling and Its Implications for the Study of Marketing Communications

2015 ◽  
Vol 4 (3) ◽  
pp. 22-50 ◽  
Author(s):  
Wilson Ozuem ◽  
Jason Prasad
Keyword(s):  
Single Case ◽  
Internet Technology ◽  
Marketing Communication ◽  
Single Case Study ◽  
New Approach ◽  
Real Money ◽  
Long Time ◽  
Ancient Times ◽  
Communication Practices

Gambling has been a part of humanity for a long time, and references to it have been found in some of the earliest dated records. Literature on the topic has been accumulating since ancient times. The advent of Internet technology along with its typical subsets provides a new approach to how gambling is conducted in postmodern times. Drawing on qualitative research and utilising a single case study strategy, this study examines online social gambling and real money gambling marketing communication practices as well as offers some insights into the development and implementation of effective marketing communication programmes. In contrast to existing studies, the paper, in part, proposes integrative and higher levels of marketing communication programmes between online social gambling and real money gambling environments.

scholarly journals IMPLEMENTASI CONTEXT AWARE PADA SISTEM TRAVEL PLANNER BERBASIS MOBILE

2021 ◽  
Vol 5 (1) ◽  
pp. 23-27
Author(s):  
Viery Darmawan ◽  
◽  
Rengga Asmara ◽  
Ira Prasetyaningrum
Keyword(s):  
Contextual Information ◽  
The Internet ◽  
Context Aware ◽  
New Approach ◽  
Tourist Attractions ◽  
Technological Advances ◽  
Long Time ◽  
Travel Efficiency ◽  
Opening And Closing

In the era of technological advances, tourists will first seek information about the tourist object to be addressed, even tourists often don't have a destination, so they have to search one by one via the internet. In determining travel plans, it is often to see one by one the review of tourist attractions and conclude the results will take a long time, while tourists need actual and fast information to determine the travel plans. In this study, the authors take a new approach, namely by creating a mobile-based travel planner system that compiles travel plans automatically by considering contextual information related to tourist location points, whether of tourist locations during travel days, travel opening and closing hours, so that it will increase travel efficiency without having to do the research manually which takes a long time. The system can also provide travel recommendations based on visitor comments sentiment on Google Places and is equipped with a trip route that will be generated automatically. This research is useful for helping tourists plan their trip actually because of the consideration of contextual information so that it will make it easier and save tourists time.

Application of the Hansen Solubility Parameters Theory to Carbon Nanotubes

2008 ◽  
Vol 8 (11) ◽  
pp. 6082-6092 ◽  
Author(s):  
S. Detriche ◽  
G. Zorzini ◽  
J.-F. Colomer ◽  
A. Fonseca ◽  
J. B. Nagy
Keyword(s):  
Carbon Nanotubes ◽  
Present Approach ◽  
New Method ◽  
Solubility Parameters ◽  
Hansen Solubility Parameters ◽  
High Solubility ◽  
New Approach ◽  
Hansen Solubility

Carbon nanotubes (CNT) are very promising nano-objects due to their exceptional properties. However, their tendency to form bundles as well as their insolubility in common solvents makes them difficult to handle. The main way to solve the problem is chemical or physical CNTs functionalisations, with all the problems inherent to the methods. In this contribution, we present a new approach that allows predicting the solubility of carbon nanotubes in many solvents but also predicting the most appropriate solvents to use for given samples of CNTs. Solubilisation and dispersion being directly connected, the present approach of solubilisation proves also to be efficient in dispersing the CNTs bundles. This contribution is a first step toward the control of carbon nanotube's dispersion in polymers and their homogenous functionalisation. Moreover, we also report here a new method, based on solvents, to separate carbon nanotubes by size, the use of mixture of non-solvents in order to obtain good solvents and the use of mixture of good solvents to obtain higher solubility. The use of mixture of good solvents allowed us to obtain high solubility, up to three times higher then that reported in literature. We have also measured and analysed the solubility of some functionalised carbon nanotubes.

scholarly journals Date canning: a new approach for the long time preservation of date

2014 ◽  
Vol 52 (4) ◽  
pp. 1872-1880 ◽  
Author(s):  
Aziz Homayouni ◽  
Aslan Azizi ◽  
Ata Khodavirdivand Keshtiban ◽  
Amir Amini ◽  
Ahad Eslami
Keyword(s):  
New Approach ◽  
Long Time

RENORMALIZATION AND ASYMPTOTICS

2000 ◽  
Vol 14 (12n13) ◽  
pp. 1327-1361 ◽  
Author(s):  
Y. OONO
Keyword(s):  
Renormalization Group ◽  
Differential Equations ◽  
Perturbation Methods ◽  
Explicit Calculation ◽  
Group Approach ◽  
New Approach ◽  
Asymptotic Behaviors ◽  
Singular Perturbation Methods ◽  
Renormalization Group Approach ◽  
Long Time

After a gentle introduction to the Stückelberg–Petermann style (i.e. field-theoretical) renormalization group (RG) theory, its application to the study of asymptotic behaviors of differential equations is explained through simple examples. The essence of singular perturbation methods to study asymptotic behaviors of differential equations is to reduce it to equations governing long time scale behaviors (i.e. the so-called reductive perturbation). The RG approach gives the reduced equation as an RG equation (this is called the reductive renormalization group approach). Once the RG equation is written down, the asymptotic behavior can be obtained by solving it. The RG equation also facilitates the error analysis of the asymptotic solutions. A new approach via "proto-RG equation" explained in this article further simplifies the reductive use of RG. For example, to the lowest nontrivial order the approach does not require any explicit calculation of perturbative results.

Theory of Chaos and Self-Organization in Description of Functional Human Body Systems

10.12737/4989 ◽  
2014 ◽  
Vol 21 (2) ◽  
pp. 15-20 ◽  
Author(s):  
Гараева ◽  
G. Garaeva ◽  
Ватамова ◽  
S. Vatamova ◽  
Филатов ◽  
...  
Keyword(s):  
Human Body ◽  
Calculation Method ◽  
Self Organization ◽  
Dynamic Processes ◽  
Periodic Motions ◽  
Cardiac Work ◽  
New Approach ◽  
Behavioral Dynamics ◽  
Periodic Processes ◽  
Long Time

Attempts to describe the behavioral dynamic model of the functional systems of the human body has traditionally been based on models of periodic and quasi-periodic processes (breathing, cardiac work, brain biopotentials, etc.). The paper assumes a new approach to the description of the voluntary or involuntary periodic or quasi-periodic motions and other dynamic processes (normal and pathological) in human body. It is shown that the norm is often chaotic behavioral dynamics of the state vector of the human body and the periodic or stationary modes of dynamics are typical of pathology, while in medicine for a long time the views were diametrically opposite. The paper presents the application of calculation method of quasi-attractors in estimation of biomechanical processes (sighting or Parkinson’s disease). The informational significance of the method is shown.

Affinity Viscosimetry Sensor for Enzyme Free Detection of Glucose in a Micro-Bioreaction Chamber

2016 ◽  
Vol 879 ◽  
pp. 1135-1140
Author(s):  
Thilo Liebscher ◽  
Franziska Glös ◽  
Andrea Böhme ◽  
M. Birkholz ◽  
M. di Vona ◽  
...  
Keyword(s):  
Glucose Concentration ◽  
Glucose Sensor ◽  
Time Measurement ◽  
Glucose Sensors ◽  
Cell Cultivation ◽  
New Approach ◽  
Microelectromechanical System ◽  
Long Time ◽  
Free Glucose

With the growing demand of miniaturization of cell cultivation a new approach towards measuring and sensing bio-analytes needs to be made due to the problem of small volumes (less than 150μl) containing small amounts of analytes. Most of the available glucose sensors monitor the glucose concentration with the help of enzymes, which become very inaccurate in terms of long time measurement and uses (i.e. consumes) glucose during the measurement becoming not available anymore for the cells. Therefore, we focused on applying an enzyme-free glucose sensor based on a microelectromechanical system (MEMS).

scholarly journals Mangrove vegetation inspires a new approach to protect shorelines

2018 ◽  
Author(s):  
Robert Segmaier ◽  
Stephanie Staggs ◽  
Sarah Palmer
Keyword(s):  
Flow Structure ◽  
Mangrove Forest ◽  
Storm Surges ◽  
Complex Flow ◽  
New Approach ◽  
Tropical Regions ◽  
Water Currents ◽  
Long Time ◽  
Mangrove Roots ◽  
Complex Flow Structure

I. AbstractMangroves are found worldwide across the rivers and coastlines in tropical regions. They are robust against storm surges and tsunamic for a long time. The roots have the most contributions for their resiliency and therefore can be inspired for future manmade structures. The motion of water in riverine mangrove forest is expected to be impacted by mangrove roots, which in turn disturb the transport of nutrients, contaminants, and residues in these systems. In this paper, a facile method for protecting shoreline is described and review and the significant impact of this method were reviewed. Bioinspired simplified models as and obstruction to water currents in shorelines, and coastal areas are presented. It was found that Mangrove roots produce complex flow structure interactions with their environment, which affect the nutrient, habitat and aquatic animals. Analysis of the flow structure behind the roots extend to a broad range of mangrove-inspired applications and provide understandings into flows that are more complex and more indicative of the flows encountered in the unidirectional riverine flow.

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