Results 141 to 150 of about 730,674 (291)

Modular Metamaterials for Adaptable MRI Signal Control: Combining Dipole Array With a New Hexagon‐Based Artificial Dielectrics

open access: yesAdvanced Science, EarlyView.
A flexible, hexagonally packed artificial dielectric providing a wide range of effective permittivities (εr ≈ 30–1400) without lumped elements was developed for clinical and ultra‐high‐field MRI. Combined with modular passive‐dipole arrays, the system enables adaptable RF field shaping through electric‐ and magnetic‐dipole tuning.
Santosh Kumar Maurya   +2 more
wiley   +1 more source

Geometric, Radiometric, Polarimetric and Along-Track Interferometric Calibration of the new F-SAR System of DLR in X-Band [PDF]

open access: yes, 2008
Since November 2006, DLR operates F-SAR - a new airborne SAR sensor beside its experimental airborne SAR sensor E-SAR. F-SAR is a totally new development utilizing most modern hardware.
Nottensteiner, Anton   +5 more
core  

An Engineered HR1‐Stem Helix‐HR2 Trimeric Platform for Developing Broad‐Spectrum Coronavirus Vaccines

open access: yesAdvanced Science, EarlyView.
Sun et al. report a self‐assembling trimeric subunit vaccine platform termed RHS, which integrates the JN.1 receptor‐binding domain (RBD) with the heptad repeat 1 (HR1), stem helix (SH), and heptad repeat 2 (HR2) regions. The SARS‐CoV‐2 RHS vaccine elicits variant‐reactive RBD‐specific antibodies and cross‐reactive SH‐specific antibodies against ...
Xikui Sun   +18 more
wiley   +1 more source

Low-dimensional multiscale fast SAR image registration method

open access: yesInternational Journal of Applied Earth Observations and Geoinformation
Synthetic aperture radar (SAR) has developed in leaps and bounds over the past decades, which makes rapid revisit and high-frequency coverage feasible. However, accurate and efficient registration of the SAR image is still a challenging task.
Jiamu Li   +8 more
doaj   +1 more source

Dual pKa Lipid Nanoparticles for Lung‐tropic mRNA Delivery and pH‐Programmed Endosomal Escape

open access: yesAdvanced Science, EarlyView.
Lipid nanoparticles’ bottleneck lies in low endosomal escape efficiency and liver‐dominant delivery after intravenous administration. To overcome these limitations, we present a stepwise pH‐programmed lipid nanoparticle system enabled by our newly synthesized ionizable lipid.
Seong Gi Lim   +12 more
wiley   +1 more source

Non-nominal Experimental Bistatic SAR Acquisitions with TanDEM-X [PDF]

open access: yes, 2012
TanDEM-X is a high-resolution interferometric mission with the main goal of providing a global and unprecedentedly accurate digital elevation model (DEM) of the Earth surface by means of single-pass X-band SAR interferometry.
Schulze, Daniel   +10 more
core  

Freestanding Hierarchical‐Porous BCZT Thin Films Enable Efficient Ultrasonic Energy Harvesting in Soft Tissue

open access: yesAdvanced Science, EarlyView.
Freestanding hierarchical‐porous BCZT thin films integrate a compliant porous surface with a dense piezoceramic backbone to balance mechanical reliability, voltage sensitivity, and acoustic coupling. The films enable stable wearable pulse‐wave monitoring and enhanced tissue‐coupled ultrasonic energy harvesting, offering a promising route toward soft ...
Zifan Li   +14 more
wiley   +1 more source

An EBG enhanced dual band wearable antenna for high gain and ultra low SAR in WBAN and ISM systems

open access: yesDiscover Applied Sciences
This paper presents a compact, low-cost dual-band antenna design with low specific absorption rate (SAR) for Wireless Body Area Networks (WBAN) and Industrial, Scientific, and Medical (ISM) applications.
Radhoine Aloui   +4 more
doaj   +1 more source

Space-borne Ka-Band Across-Track SAR Interferometer [PDF]

open access: yes, 2012
The results of an ESA study concerning a future Ka-band SAR mission and instrument concept are reported. One aim of the study has been to explore the feasibility of a future single-platform, across-track interferometric SAR instrument with HRTI-3 ...
Dagazo-Eusebio, Elena   +5 more
core  

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