Results 61 to 70 of about 31,808 (349)

Redundant RF system for space application [PDF]

, 1979
An S-band radio frequency subsystem is described including two transmitters, two receivers and two antennas. The subsystem is capable of connecting either transmitter or receiver to either antenna while permitting simultaneous operation of a transmitter ...
Rook, C. W.
core   +1 more source

A practical theorem on using interferometry to measure the global 21-cm signal [PDF]

, 2016
The sky-averaged, or global, background of redshifted $21$ cm radiation is expected to be a rich source of information on cosmological reheating and reionizaton.
Chang, Tzu-Ching, Doré, Olivier, Hirata, Christopher M., Venumadhav, Tejaswi   +3 more
core   +3 more sources

Recent Advances in Electrospun Nanofibers for Triboelectric Nanogenerators: Performance Enhancement Strategies and Emerging Applications

Advanced Materials, EarlyView.
This review highlights recent advances in electrospun nanofiber‐based triboelectric nanogenerators, emphasizing how material design, fiber architecture, and interface engineering collectively enhance output performance and mechanical durability. Key developments in porous, aligned, core‐shell, and hierarchical nanofibers are discussed alongside ...
MD Fajla Rabbi, Jee Hwan Ahn, Duy Linh Vu, Kyoung Kwan Ahn   +3 more
wiley   +1 more source

Dual CP Polarization Diversity and Space Diversity Antennas Enabled by a Compact T-Shaped Feed Structure

IEEE Access, 2019
A compact T-shaped feed structure (TFS) is reported that enables the realization of two types of diversity antennas: a polarization diversity antenna (PDA) and a spatial diversity antenna (SDA).
Junping Geng, Richard W. Ziolkowski, Kun Wang, Xiaonlan Zhao, Han Zhou, Guanshen Chenhu, Xianling Liang, Ronghong Jin   +7 more
doaj   +1 more source

Omnidirectional antennas transmit and receive over large bandwidth [PDF]

, 1966
For exchanging wideband signals between two distant ground stations, low-gain antennas with wide angular coverage and circular polarization are mounted on a single mast extending from a satellite.
Woodward, O. M., Jr.
core   +1 more source

Topological Point Defects in SmC* Liquid Crystals Under Mechanical Disturbance

Advanced Materials Interfaces, EarlyView.
Tangetial air jet shear inducess island formation and nucleates topological point defects in uniform SmC films. Island bounded by edge dislocation loops shrink and transform into isolated point defects under continued shear. Mechanical perturbatio provides a controllable route for defect engineering in smectric liquid crystal thin films.
Gunganist Kongklad, Vandana Molahalli, Apichart Pattanaporkratana, Nattaporn Chattham   +3 more
wiley   +1 more source

Оптимизация перехода от коаксиала к микрополосковой линии питания печатного квази-Яги излучающего элемента ФАР [PDF]

, 2013
У роботі представлені результати чисельного дослідження конструкції переходу від коаксіалу до мікросмужкової лінії живлення друкованої квазі-Ягі антени. Запропоновано і оптимізовано практичну і надійну конструкцію переходу з подальшим її інтегруванням і ...
Dubrovka, F. F., Vydalko, O. E., Видалко, О. Е., Видалко, О. Є., Дубровка, Ф. Ф., Дубровка, Ф. Ф.   +5 more
core  

Vat Polymerization 3D Printing for Controlled Drug Release Applications

Advanced Materials Technologies, EarlyView.
ABSTRACT Vat polymerization (VP) 3D printing, a light‐based additive manufacturing technique, has emerged as a promising technique for fabricating complex drug delivery systems with high precision and spatial resolution. This layer‐by‐layer manufacturing process enables the creation of intricate geometries and customizable architectures, which are ...
Hafiz Busari, O. Thompson Mefford, M. Aaron Vaughn   +2 more
wiley   +1 more source

Broadband choke for antenna structure [PDF]

, 1969
Broadband chokes and absorbers to reduce spurious radiation patterns of antenna array caused by support ...
Bishop, O. L., Bolt, C. A., Jr.
core   +1 more source

Characterization and Design Framework for Micro‐ and Nanoscale Printed Metal Interconnects in Hybrid Electronic Systems

Advanced Materials Technologies, EarlyView.
This work establishes a framework for high‐resolution printed interconnects by coupling e‐jet printing control, multilayer deposition, and sintering optimization. Ink properties and printing speed influence particle stacking, while different sintering atmospheres drive distinct microstructural evolution.
Kaifan Yue, Siddharth Kurup, Rebecca Banner, Calib Lanier, Eric Vogel, Michael Filler, Kira Barton   +6 more
wiley   +1 more source