Results 271 to 280 of about 9,836,724 (331)
Some of the next articles are maybe not open access.
A wideband low RCS and high gain phase gradient metalens antenna
AEU - International Journal of Electronics and Communications, 2021A wideband low RCS but high gain phase gradient metalens antenna (PGMA) is proposed in this paper. The proposed PGMA is comprised of 3 layers of phase gradient metasurface (PGM) as inhomogeneous special metalens structure (PGML) which are fed by a ...
Mohammad Isaac Mirzapour +2 more
semanticscholar +1 more source
pH Gradient Reversed-Phase HPLC
Analytical Chemistry, 2003pH gradient HPLC is reported, which is a new original mode of reversed-phase high-performance liquid chromatography applicable to ionogenic analytes. The method consists of programmed increase during the chromatographic run of the eluting strength of the mobile phase with respect to the acid/base analytes separated.
Roman, Kaliszan +2 more
openaire +2 more sources
Reverberant shear wave phase gradients for elastography
Physics in Medicine & Biology, 2021Abstract Reverberant shear wave fields are produced when multiple sources and multiple reflections establish a complex three-dimensional wave field within an organ. The expected values are assumed to be isotropic across all directions and the autocorrelation functions for velocity are expressed in terms of ...
J Ormachea, K J Parker
openaire +2 more sources
ACS Applied Materials and Interfaces
Microwave Wireless Power Transfer (MWPT) technology is crucial for emergency power supply during natural disasters and powering off-grid equipment.
Han Xiong +5 more
semanticscholar +1 more source
Microwave Wireless Power Transfer (MWPT) technology is crucial for emergency power supply during natural disasters and powering off-grid equipment.
Han Xiong +5 more
semanticscholar +1 more source
Applied Physics Letters
This paper proposes a hybrid microwave power receiving (MPR) metasurface array with efficient dual matching of surface impedance and phase gradient. The hybrid array comprises three components: a reflective phase gradient metasurface (R-PGM) array, a ...
Han Xiong +5 more
semanticscholar +1 more source
This paper proposes a hybrid microwave power receiving (MPR) metasurface array with efficient dual matching of surface impedance and phase gradient. The hybrid array comprises three components: a reflective phase gradient metasurface (R-PGM) array, a ...
Han Xiong +5 more
semanticscholar +1 more source
IEEE Antennas and Wireless Propagation Letters
This letter proposes a quantification phase gradient near-field focusing metasurface (MS) to improve the transmission coefficient of the microwave wireless power transfer (WPT) system.
Zhong Yu +4 more
semanticscholar +1 more source
This letter proposes a quantification phase gradient near-field focusing metasurface (MS) to improve the transmission coefficient of the microwave wireless power transfer (WPT) system.
Zhong Yu +4 more
semanticscholar +1 more source
Dual-Band Beam-Scanning Antenna Using Rotatable Planar Phase Gradient Transmitarrays
IEEE Transactions on Antennas and Propagation, 2020A design of dual-band beam-scanning antenna using rotatable planar transmitarrays (TAs) is proposed in this communication. The antenna is composed of a dual-band lens and a pair of linear phase gradient (PG) TAs.
Qingyun Zeng, Z. Xue, W. Ren, Weiming Li
semanticscholar +1 more source
Phase Behavior of Gradient Copolymers
Macromolecules, 2008A multiblock model is developed for the study of the phase behavior of gradient copolymers. The model is able to describe gradient copolymer chains with arbitrary composition profiles. The validity of the multiblock model of gradient copolymers is established by good agreement between RPA (random phase approximation) results for a continuous ...
Run Jiang +5 more
openaire +1 more source
Phase behavior of gradient copolymers
The Journal of Chemical Physics, 1999Phase properties of gradient AB copolymer melts which consist of chains with the specified chemical distribution of A and B monomers have been studied within the Landau–Ginzburg model. All the melts with the linear distribution of the monomers exhibit only a direct continuous phase transition from disordered to the lamellar phase.
Aleksij Aksimentiev, Robert Hołyst
openaire +1 more source
Beam Tilting Approaches Based on Phase Gradient Surface for mmWave Antennas
IEEE Transactions on Antennas and Propagation, 2020This article presents four different approaches utilized in beam tilting that are based on the phase gradient (phase shifting) surfaces. Each approach is individually analyzed and then compared to other techniques.
M. Akbari +5 more
semanticscholar +1 more source