Equivalent circuits containing frequency-variable radiation resistances are postulated for small monopole and small loop antennas above a ground plane. The equivalent circuits are valid below the fi rst natural resonance frequency. By adding an external series inductance or a parallel capacitance, the antenna’s Q is evaluated with the use of an invariant form for the refl ection coeffi cient. T...

As a tendency to use new technologies, gadgets such as laptop computers are becoming more popular among students, teachers, businessmen and office workers. Today laptops are a great tool for education and learning, work and personal multimedia. Millions of men, especially those in the reproductive age, are frequently using their laptop computers on the lap (thigh). Over the past several years, ...

Th e development of non-invasive, non-toxic, and non-pollutant methods for the treatment of diff erent illnesses represents a constant concern of scientists from the medical fi eld worldwide. In this category fi t the methods based on the use of laser systems, which are successfully applied both in human and veterinary medicine due to the special properties of laser radiation: monocromaticity, ...

Introduction: In recent years, we have seen a tremendous growth in communications devices, such as mobiles and tablets. Also, the appeal to connect to the Internet through wireless systems has increased significantly. Given these changes in everyday life, the approach to cognitive works and problem-solving and decision-making in a complex system that has become increasingly imp...

In this work, we investigate the axionlike particle (ALP)-photon oscillation effect in spectra of blazar Markarian 421 (Mrk 421) using 4.5 years Astrophysical Radiation with Ground-based Observatory at YangBaJing (ARGO-YBJ) and Fermi Large Area Telescope (Fermi-LAT) data. These data are collected during common operation time, which cover ten activity phases Mrk 421. No significant ALP-photon is...

it also exhibits a photovoltaic effect, [ 2 ] metal-insulator transition, [ 3 ] electric modulation of conduction, [ 4 ] and terahertz radiation emission. [ 5 ] The lead-free composition and above room temperature multifunctionality make BiFeO 3 a potential material for a wide variety of applications in terms of sensors, memories, and spintronic devices. [ 6 ] The high value of ferroelectric po...

We study the Jeans mass-radius relation of Bose-Einstein condensate dark matter in Newtonian gravity. show at a general level that it is similar to core halos [, Phys. Rev. D 84, 043531 (2011)]. Bosons with repulsive self-interaction generically evolve from Thomas-Fermi regime noninteracting as Universe expands. In regime, radius remains approximately constant while mass decreases. increases an...

Background. Wi-Fi has many disadvantages, such as how the maximum bandwidth is limited by frequency of range. The work uses Li-Fi technology, which visible light for data transmission. range 1000 times greater than entire radio Feedback used to increase throughput. But feedback decreases downstream signal.
 Objective. purpose paper analyse what parameters are advisable change throughput sy...