Results 111 to 120 of about 85,808 (303)

Wideband Direction-of-Arrival Estimation With Arbitrary Array via Coherent Annihilating

IEEE Access, 2019
In this paper, a new wideband DOA estimation method for arbitrary array application is proposed. The arbitrary array manifold is approximately decomposed under the concept of manifold separation technique (MST) and a linear combination of the equal ...
Yujian Pan, Guo Qing Luo, Zhen Liao, Bengeng Cai, Min Yao   +4 more
doaj   +1 more source

Probing Cellular Activity Via Charge‐Sensitive Quantum Nanoprobes

Advanced Materials, EarlyView.
A new quantum sensing modality detects shifts in zero‐field splitting caused by charge rearrangement with diamond nanocrystals in response to cellular activity. These electric‐field‐driven effects provide an alternative to temperature‐based interpretations, enabling real‐time, single‐cell readout of inflammation.
Uri Zvi, Shivam Mundhra, David Ovetsky, Qing Chen, Aidan R. Jones, Stella Wang, Maria J. Román‐Vazquez, Marie Kim, Udoka M. Ibeh, Michele Ferro, Kunle Odunsi, Marina C. Garassino, Michael E. Flatté, Melody A. Swartz, Denis R. Candido, Aaron Esser‐Kahn, Peter C. Maurer   +16 more
wiley   +1 more source

Dual-Polarized Crossed Bowtie Dipole Array for Wireless Communication Applications

International Journal of Antennas and Propagation, 2014
A dual-polarized array with downtilted radiation patterns is proposed for wireless communication applications. The proposed dual-polarized antenna element achieves an enhanced impedance bandwidth and compact dimensions by introducing a parasitic circular
Zhi-Ya Zhang, Shuang Li, Shao-Li Zuo, Jia-Yue Zhao, Xiao-dong Yang, Guang Fu   +5 more
doaj   +1 more source

Single-, Dual- and Triple-band Frequency Reconfigurable Antenna [PDF]

, 2014
The paper presents a frequency reconfigurable slot dipole antenna. The antenna is capable of being switched between single-band, dual-band or triple-band operation.
Hamid, M. R., Idris, I. H., Jamaluddin, M. H., Kelly, J. R., Majid, H. A., Rahim, M. K. A.   +5 more
core   +1 more source

Mesoporous Silica Nanoparticles in Biomedicine: Advances and Prospects

Advanced Materials, EarlyView.
Mesoporous silica nanoparticles offer unique properties like high surface area, tunable pores, and functionalization. They excel in drug delivery, tissue engineering, and stimuli‐responsive therapies, enabling targeted and controlled treatments. With roles in cancer therapy and diagnostics, their clinical translation requires addressing challenges in ...
Miguel Manzano, María Vallet‐Regí
wiley   +1 more source

Opportunities of Semiconducting Oxide Nanostructures as Advanced Luminescent Materials in Photonics

Advanced Materials, EarlyView.
The review discusses the challenges of wide and ultrawide bandgap semiconducting oxides as a suitable material platform for photonics. They offer great versatility in terms of tuning microstructure, native defects, doping, anisotropy, and micro‐ and nano‐structuring. The review focuses on their light emission, light‐confinement in optical cavities, and
Ana Cremades, Pedro Hidalgo, David Maestre, Ruth Martínez‐Casado, Emilio Nogales, Beatriz Rodríguez, G. Cristian Vásquez, Bianchi Méndez   +7 more
wiley   +1 more source

Optimization of Concentric Ring Array Geometry for 3D Beam Scanning

International Journal of Antennas and Propagation, 2012
Optimization of the element placement in a concentric ring array for three-dimensional (3D) beam scanning with minimum peak sidelobe levels (SLLs) is addressed in this paper.
Li Zhang, Yong-Chang Jiao, Bo Chen
doaj   +1 more source

Metamaterial Antennas Enhance MRI of the Eye and Occipital Brain

Advanced Materials, EarlyView.
A radiofrequency antenna platform comprising planar and bend configurations is developed, incorporating structurally integrated epsilon‐negative metamaterial unit cells to enhance MRI. These antennas enable high‐resolution in vivo human MRI of the eye, orbit, and occipital brain. Comprehensive validation, including simulations, phantom experiments, SAR,
Nandita Saha, Bilguun Nurzed, Mostafa Berangi, Andre Kuehne, Helmar Waiczies, Igor Fabian Tellez Ceja, Xiang Hu, Thomas Gladytz, Lisa Krenz, Dave Huebler, Beate Endemann, Claudia Brockmann, Ebba Beller, Oliver Stachs, Thoralf Niendorf   +14 more
wiley   +1 more source

Monte Carlo Simulation of the Echo Signals from Low-Flying Targets for Airborne Radar

International Journal of Antennas and Propagation, 2014
A demonstrated hybrid method based on the combination of half-space physical optics method (PO), graphical-electromagnetic computing (GRECO), and Monte Carlo method on echo signals from low-flying targets based on actual environment for airborne radar is
Mingyuan Man, Zhenya Lei, Yongjun Xie, Botao Chen, Qing Wang   +4 more
doaj   +1 more source

Noise Parameters of CW Radar Sensors Used in Active Defense Systems [PDF]

, 2012
Active defense represents an innovative way of protecting military vehicles. It is based on the employment of a set of radar sensors which detect an approaching threat missile and activate a suitable counter-measure.
Hudec, P., Jenik, V., Panek, P.
core   +1 more source