Results 81 to 90 of about 29,736 (309)

Supraparticles Composed of Graphitic Carbon Nitride Nanoparticles and Silica‐Supported Horseradish Peroxidase as Customizable Hybrid Catalysts for Photo‐Biocatalytic Cascade Reactions in Continuous Flow

Advanced Functional Materials, EarlyView.
Herein presented supraparticles combine the nanoparticulate photocatalyst graphitic carbon nitride with the enzyme horseradish peroxidase, which is immobilized on silica nanoparticles. In an optimized compatibility range, both catalysts operate effectively within the hybrid supraparticles and catalyze a cascade reaction consisting of the photocatalytic
Bettina Herbig, Egzon Cermjani, Doris Hanselmann, Johannes Prieschl, Angelika Schmitt, Michael S. Moritz, Christian Papp, Greta Nölke, Stefano Di Fiore, Christoph Deckers, Thomas H. Rehm, Susanne Wintzheimer   +11 more
wiley   +1 more source

Optical control of an 8-element Ka-band phased array using a high-speed optoelectronic interconnect [PDF]

Optical distribution of control signals in electronically steered phased array antennas is being considered. A demonstration experiment is described in which a high speed hybrid GaAs optoelectronic integrated circuit (OEIC) was used to control an eight ...
Bendett, M., Bhasin, K. B., Claspy, P. C., Richard, M. A.   +3 more
core   +1 more source

Nonreciprocal-Beam Phased-Array Antennas

, 2020
This study presents a nonreciprocal-beam phased-array antenna constituted of phase-gradient patch radiators integrated with transistor-based nonreciprocal phase shifters. Such an antenna exhibits different beams for transmission and reception states.
Karimian, Reza, Ahmadi, Shahrokh, Zaghloul, Mona, Taravati, Sajjad   +3 more
openaire   +2 more sources

Programmable DNA‐Peptide Hybrid Nanostructures for Potent Neutralization of Multiple Influenza a Virus Subtypes

Advanced Functional Materials, EarlyView.
A multivalent antiviral platform based on honeycomb‐shaped DNA nanostructures (HC–Urumin) is developed to enhance the potency and breadth of the host defense peptide Urumin. Through spatially patterned trimeric presentation, HC–Urumin disrupts influenza A virus entry, improves cell viability, and reduces disease severity in vivo‐offering a modular and ...
Saurabh Umrao, Abhisek Dwivedy, Payton L. Haak, Dhanush Gandavadi, Laurie A. Rund, Chi Chen, Vineetha Mareddy, Lifeng Zhou, Jinwei Duan, Ying Fang, Andrew J. Steelman, Xing Wang   +11 more
wiley   +1 more source

Improving Wide-Angle Scanning Performance of Phased Array Antenna by Dielectric Sheet

IEEE Access, 2019
The method to improve the wide-angle scanning performance of the phased array antenna is studied and presented. The proposed method is realized by the dielectric sheet to reduce the size of the wide beam antenna and mutual coupling between the elements ...
Guangwei Yang, Qingqing Chen, Jianying Li, Shigang Zhou, Zijian Xing   +4 more
doaj   +1 more source

Ka-band feed arrays for spacecraft reflector antennas with limited scan capability: An overview [PDF]

, 1992
JPL and NASA are in the process of developing ground and spacecraft antenna systems at Ka-band frequencies for future deep space applications. The use of Ka-band (32-GHz down) communication will result in smaller ground and spacecraft antennas and ...
Jamnejad, V.
core   +1 more source

Multiscale Structuring of Hydroxyapatite via Two‐Photon Lithography of Nanocomposites

Advanced Functional Materials, EarlyView.
Hydroxyapatite scaffolds are of great interest in bone tissue engineering applications, ranging from 3D cell culture to regenerative medicine. Using two‐photon lithography of a transparent nanocomposite, hydroxyapatite microstructures with features ranging from submicron to centimeter‐scale are fabricated. This allows to mimic the natural bone geometry,
Leonhard Hambitzer, Jan Mathis Hornbostel, Richard Prediger, Sebastian Kluck, Michael Daub, Cornelia Lee‐Thedieck, Frederik Kotz‐Helmer   +6 more
wiley   +1 more source

EFFECT OF THE GROUND PARAMETER VARIATIONS ON THE SENSITIVITY OF AN ACTIVE PHASED ARRAY ANTENNA ELEMENT OF THE LOW-FREQUENCY GURT RADIO TELESCOPE

Radio Physics and Radio Astronomy, 2019
Purpose: Theoretical studies of sensitivity fluctuations of a phased array antenna element for the GURT radio telescope of the new generation caused by seasonal changes of the ground parameters. Design/methodology/approach: A mathematical model of an
P. L. Tokarsky, A. A. Konovalenko, N. N. Kalinichenko, S. N. Yerin   +3 more
doaj   +1 more source

S-band antenna phased array communications system [PDF]

The development of an S-band antenna phased array for spacecraft to spacecraft communication is discussed. The system requirements, antenna array subsystem design, and hardware implementation are examined.
Chapman, J. E., Delzer, D. R., Griffin, R. A.   +2 more
core   +1 more source

Photonic RF and microwave reconfigurable filters and true time delays based on an integrated optical Kerr frequency comb source

, 2018
We demonstrate advanced transversal radio frequency (RF) and microwave functions based on a Kerr optical comb source generated by an integrated micro-ring resonator.
Chu, Sai T., Little, Brent E., Mitchell, Arnan, Morandotti, Roberto, Moss, David J., Nguyen, Thach G., Shoeiby, Mehrdad, Wu, Jiayang, Xu, Xingyuan   +8 more
core   +1 more source