Results 111 to 120 of about 1,086,608 (306)

Wood‐Derived Nanocellulose‐Biocarbon Fresnel‐Zone Plate Lenses for Sub‐THz Frequency Applications

Advanced Materials Technologies, EarlyView.
Wood‐derived nanocellulose and lignin‐based biocarbon were combined to fabricate fully bio‐based Fresnel zone plate (FZP) lenses for sub‐terahertz frequencies. These sustainable FZP lenses exhibit low dielectric loss and high directivity, achieving performance comparable to that of metallic references, and remain functional under environmental stress ...
Riikka Haataja, Mikko Kokkonen, Niina Halonen, Sami Myllymäki, Umair Rafique, Mandeep Singh, Ossi Laitinen, Heli Jantunen, Kristiina Oksman, Henrikki Liimatainen   +9 more
wiley   +1 more source

High toughness and strong microwave absorption of layered Si3N4–SiC/BN ceramics loaded with different SiC contents

Journal of Advanced Ceramics
Layered ceramics can simultaneously achieve high toughness and strong microwave absorption. In this work, layered Si3N4–SiC/boron nitride (BN) ceramics were prepared by tape casting and hot pressing, and the effect of microsized SiC content on their ...
Erlin Zhao, Yi Jia, Quan Li, Jianhao Zhang, Wenzhi Hao, Yang Wang, Jian Yang   +6 more
doaj   +1 more source

Low‐Pressure Plasma‐Based Wrinkling of PDMS and Machine Learning‐Driven Property Engineering

Advanced Materials Technologies, EarlyView.
Wrinkled surfaces are well‐suited for controlled surface deformations in the µm range. The key challenge is the relation between the resulting wrinkle features and the necessary process conditions. Machine learning techniques have solved the prediction and inverse design problems for various preparation conditions, opening a precisely controlled ...
Fabian Kopsch, Atmika Bhardwaj, Mirko Nitschke, Ilka Hermes, Andreas Fery, Anett Müller, Marco Werner, André Knapp   +7 more
wiley   +1 more source

Synthesis of Fe@Ni nanoparticles-modified graphene/epoxy composites with enhanced microwave absorption performance

, 2017
High performance microwave absorber consisting of Fe@Ni nanoparticles (NPs) modified reduced graphene oxide (RGO) and epoxy resin was successfully prepared.
Yang, Shuang, Xiaogang Su, Junpeng Wang, Siqi Huo, Wang, Jun, Tan, Haoyuan, Chen, Wei, Jun Wang, Shuang Yang, Wei Chen, Zhang, Bin, Su, Xiaogang, Haoyuan Tan, Wang, Junpeng, Bin Zhang, Huo, Siqi   +15 more
core   +1 more source

Nanopatterned Dual‐Carbon‐Dot Photonic Films With Enhanced Light Outcoupling

Advanced Optical Materials, EarlyView.
Nanoimprinted dual‐carbon‐dot/PVA films combine composition‐tunable blue–green emission with grating‐mediated directional light outcoupling. Water‐processable B‐CD and G‐CD composites are patterned by drying‐assisted nanoimprinting, producing angle‐selective emission peaks that follow the first‐order diffraction condition and exhibit reference ...
Gyudam Jeon, Heetae Ahn, Taeguen Kim, Na Young Ha   +3 more
wiley   +1 more source

An investigation of minerals using microwave measurement of complex permittivity [PDF]

, 1990
Includes bibliography.Microwave measurement techniques have found many industrial and commercial applications. This measurement potential of microwaves, together with observations that different minerals show different microwave heating characteristics ...
Pendock, Graeme
core   +1 more source

Broadband microwave absorption and improved electromagnetic performance of iron oxide–activated carbon hybrid composites in the Ku-band

Next Materials
This study explores the enhancement of microwave absorption properties in iron oxide (IO) composites through the incorporation of bio-waste-derived activated carbon (AC).
Murtala Alhaji Bello, Raba’ah Syahidah Azis, Nurul Asiya Nadhirah Binti Yusmadi, Ismayadi Ismail, Muhammad Kashfi Shabdin, Nurul Huda Osman, Abubakar Yakubu, Yusuf Sani   +7 more
doaj   +1 more source

Programmable Anisotropic Terahertz Permittivity via High‐Aspect‐Ratio 3D‐Printed Dielectric Mesh Networks

Advanced Optical Materials, EarlyView.
A 3D‐printed Terahertz (THz) anisotropic dielectric with programmable permittivity by varying infill density and creating high‐aspect‐ratio channels is presented. The proposed design was evaluated both experimentally, through THz time‐domain spectroscopy, and theoretically, through FDTD simulations and Effective Medium Theory analysis.
Chi Him Liu, Hwan Sik Kim, Andre Sarker Andy, Imad A.M. Ahmed, Yeong Hwan Ahn, Sang‐Soo Chee, Mira Naftaly, John E. Cunningham, Sae June Park   +8 more
wiley   +1 more source

Effect of Fiber Type and Length on Strength, Fracture Energy, and Durability Properties of Microwave-Cured Fiber-Reinforced Geopolymer Mortars

Buildings
Microwave curing can be an alternative curing method for geopolymer production. Although many properties of microwave-cured geopolymer composites have been investigated, the effect of microwave curing on the strength and durability properties of fiber ...
Adil Gultekin
doaj   +1 more source

Microwave Absorption and Emission in the Atmosphere of Venus.

The Astrophysical Journal, 1960
The planet Venus is obscured by a permanent cloud layer which prevents clear observation of its lower atmosphere or surface by optical techniques. Radio astronomy, however, appears to offer a means by which the lower atmosphere may be probed. Measurements made at the Naval Research Laboratory of the microwave radiation from Venus near inferior ...
openaire   +1 more source