Results 131 to 140 of about 2,469,239 (346)

Microstructure Design of Steel‐Spinel Composites via Spark Plasma Sintering Process

Advanced Engineering Materials, EarlyView.
This study illustrates how spark plasma sintering at reduced oxygen partial pressure enables controlled formation of steel‐spinel composites through tailored redox reactions and cation exchange. Comparison of the MgO–Fe2O3, steel–(MgO+Cr2O3), and steel–(MgO+Fe2O3) systems shows how oxygen activity and interface chemistry govern spinel formation, phase ...
Mahnaz Mehdizadehlima, Christian Schimpf, Stefan Martin, Olga Fabrichnaya, David Rafaja   +4 more
wiley   +1 more source

Broadband flexible comb-shaped monopole antenna

IET Microwaves, Antennas & Propagation, 2009
A broadband comb-shaped monopole antenna is proposed. The antenna has dimensions of 19 mm×12 mm. The measured results show good agreement with the numerical prediction, and broadband operation with 10 dB impedance bandwidth of 44.75% (1.7–2.68 GHz). The antenna is built on one side of a flexible-printed circuit board (PCB) dielectric substrate.
J. Jung, H. Lee, Y. Lim
openaire   +1 more source

Design and Optimization of a High Gain Thin-Film Flexible Antenna for 28 GHz Wireless Wearables

IEEE Open Journal of Antennas and Propagation
This paper proposes an antenna consisting of polyimide and fluoride synthesized multilayer thinfilm materials on a flexible substrate. The antenna is suitable for millimeter-wave applications at 28 GHz and can be applied to wearable devices by utilizing ...
Ming-An Chung, Chia-Wei Lin, Yu-Hsun Chen   +2 more
doaj   +1 more source

Systems identification technology development for large space systems [PDF]

, 1982
A methodology for synthesizinng systems identification, both parameter and state, estimation and related control schemes for flexible aerospace structures is developed with emphasis on the Maypole hoop column antenna as a real world application. Modeling
Armstrong, E. S.
core   +1 more source

Design and Measurement of 3D Flexible Antenna Diversity for Ambient RF Energy Scavenging in Indoor Scenarios

IEEE Access, 2019
Ambient radiofrequency (RF) energy scavenging has been recently addressed with a wide range of studies to provide alternative powering for low-power applications. However, due to the low power level of the ambient electromagnetic field, the efficiency of
D. H. N. Bui, T. Vuong, J. Verdier, B. Allard, P. Benech   +4 more
semanticscholar   +1 more source

Intermolecular Interactions as Driving Force of Increasing Multiphoton Absorption in a Perylene Diimide‐Based Coordination Polymer

Advanced Functional Materials, EarlyView.
This study uncovers the unexplored role of intermolecular interactions in multiphoton absorption in coordination polymers. By analyzing [Zn2tpda(DMA)2(DMF)0.3], it shows how the electronic coupling of the chromophores and confinement in the MOF enhance two‐and three‐photon absorption.
Simon Nicolas Deger, Anna Mauri, Yang Cui, Sebastian Josef Weishäupl, Ali Deniz Özdemir, Hamad Syed, Aleksandr Ovsianikov, Wolfgang Wenzel, Alexander Pöthig, Jürgen Hauer, Mariana Kozlowska, Roland Augustinus Fischer   +11 more
wiley   +1 more source

Recent advances in structural dynamics of large space structures [PDF]

Recent progress in the area of structural dynamics of large space structures is reviewed. Topics include system identification, large angle slewing of flexible structures, definition of scaling limitations in structural models, and recent results on a ...
Pinson, Larry D.
core   +1 more source

A flexible dual-band 4 × 4 MIMO antenna for 5G mm-wave 28/38 GHz wearable applications

Scientific Reports
This paper presents a novel, dual-band, four-port multi-input–multi-output (MIMO) antenna for 28/38 GHz millimeter wave 5G wearable applications. In the proposed work, we have used a novel design approach to get the dual-band behavior from a MIMO design ...
R. Tiwari, Deepti Sharma, Prabhakar Singh, Pradeep Kumar   +3 more
semanticscholar   +1 more source

Advancing Electronic Application of Coordination Solids: Enhancing Electron Transport and Device Integration via Surface‐Mounted MOFs (SURMOFs)

Advanced Functional Materials, EarlyView.
The layer‐by‐layer (LbL) assembly of coordination solids, enabled by the surface‐mounted metal‐organic framework (SURMOF) platform, is on the cusp of generating the organic counterpart of the epitaxy of inorganics. The programmable and sequential SURMOF protocol, optimized by machine learning (ML), is suited for accessing high‐quality thin films of ...
Zhengtao Xu, Christof Wöll, Stefan Bräse   +2 more
wiley   +1 more source

Decoupled and linear quadratic regulator control of a large, flexible space antenna with an observer in the control loop [PDF]

An analysis is performed to compare decoupled and linear quadratic regulator (LQR) procedures for the control of a large, flexible space antenna. Control objectives involve: (1) commanding changes in the rigid-body modes, (2) nulling initial disturbances
Hamer, H. A., Johnson, K. G., Young, J. W.   +2 more
core   +1 more source