Results 61 to 70 of about 1,614 (200)

Biconical Cavity Utilised in Realising Quadruple‐ and Quintuple‐Mode Wideband Bandpass Filters

open access: yesIET Microwaves, Antennas &Propagation, Volume 19, Issue 1, January/December 2025.
This article introduces the biconical cavity as a novel multimode resonator for wideband bandpass filters, enabling effective mode separation and suppression of higher‐order resonances. A quadruple‐mode prototype operating at 3.82 GHz with 46.8% FBW and a quintuple‐mode prototype at 3.52 GHz with 67.2% FBW were designed, fabricated and measured ...
Maha H. Elfeshawy   +2 more
wiley   +1 more source

Accommodating version of a schematic eye for emmetropia and myopia

open access: yesOphthalmic and Physiological Optics, Volume 45, Issue 1, Page 221-230, January 2025.
Abstract Aim To develop an accommodating, wide‐angle, schematic eye for emmetropia and myopia in which spectacle refraction and accommodation level are input parameters. Method The schematic eye is based on an earlier unaccommodated refraction‐dependent eye for myopia developed by Atchison in 2006.
David A. Atchison, W. Neil Charman
wiley   +1 more source

Multiband Asymmetric Biconical Dipole Antenna with Distributed Surface Impedance and Arbitrary Excitation

open access: yesEast European Journal of Physics
A numerical-analytical solution of a problem concerning the current distribution and input characteristics of asymmetric biconical dipole with distributed surface impedance and arbitrary excitation and derived in the thin-wire approximation.
Mikhail V. Nesterenko   +2 more
doaj   +1 more source

Comparative study of NGOs towards disaster risk reduction in Nigeria [PDF]

open access: yes, 2018
The aim of this paper is to explore some comparative advantages of training indigenous groups towards disaster risk reduction. Non-Governmental Organizations (NGOs) are nonprofit organizations that have been recognized based on their efforts towards ...
Ali, Maimunah, Gabarin Umar, Abubakar
core   +1 more source

Advances in Novel Structures and Materials for Shaped Charge Liners

open access: yesShock and Vibration, Volume 2025, Issue 1, 2025.
As a core component of shaped charges, the liner’s structural and material properties are crucial for overcoming traditional technological limitations and enhancing the cumulative effect in applications involving civil explosives and resource extraction. This field presents broad application prospects.
Yihao Shen   +7 more
wiley   +1 more source

Intelligent vehicle scheduling in open-pit mines based on 5G antenna and improved Dijkstra algorithm

open access: yesGong-kuang zidonghua
Complex terrains such as deep pits and high slopes in open-pit mines cause physical signal blockage and multipath fading. Furthermore, existing path-planning algorithms tend to result in unstable vehicle trajectories or congestion due to local optima ...
CHEN Xiaolei, CHEN Liufang, WANG Jie
doaj   +1 more source

Integrated broadband bowtie antenna on transparent substrate

open access: yes, 2015
The bowtie antenna is a topic of growing interest in recent years. In this paper, we design, fabricate, and characterize a modified gold bowtie antenna integrated on a transparent glass substrate.
Chen, Ray T.   +7 more
core   +1 more source

A study on the transferable skills of the engineering students at Universiti Tun Hussein Onn Malaysia [PDF]

open access: yes, 2017
The purpose of this study was to identify the students' levels of awareness of the importance of transferable skills and the mastery of the aspects of adaptive, critical thinking, and problem-solving.
Abd Baser, Jamil   +3 more
core   +3 more sources

Study and applications of retrodirective and self adaptive electromagnetic-wave phase controls to a Mars probe [PDF]

open access: yes
Computer analyses of retrodirective, and self adaptive antenna phase control techniques for Mars ...
Battelle, R. B.   +5 more
core   +1 more source

Calibration of the Logarithmic-Periodic Dipole Antenna (LPDA) Radio Stations at the Pierre Auger Observatory using an Octocopter [PDF]

open access: yes, 2017
An in-situ calibration of a logarithmic periodic dipole antenna with a frequency coverage of 30 MHz to 80 MHz is performed. Such antennas are part of a radio station system used for detection of cosmic ray induced air showers at the Engineering Radio ...
Aab, A.   +404 more
core   +3 more sources

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