Results 71 to 80 of about 4,057 (212)

Probing Viscoelasticity of Polymeric Coatings Using Nonlinear Dynamic Atomic Force Microscopy

Small Methods, Volume 10, Issue 2, 22 January 2026.
For soft materials it is essential to characterize both the elastic and viscous material properties. Using an atomic force microscope, the hardening nonlinearity induced by a tip‐sample contact and bifurcation points can be used to separately estimate the visco‐ and elastic parts of the tip‐sample interaction force.
Lara Vivian Fricke, Nick Wansink, Michel Rosso, Urs Staufer, Pierpaolo Belardinelli, Farbod Alijani   +5 more
wiley   +1 more source

Multifunctional Cascaded Metamaterials: Integrated Transmitarrays

, 2016
Control of electromagnetic waves using engineered materials is very important in a wide range of applications, therefore there is always a continuous need for new and more efficient solutions. Known natural and artificial materials and surfaces provide a
Asadchy, Viktar S., Elsakka, Amr A., Faniayeu, Ihar A., Tcvetkova, Svetlana N., Tretyakov, Sergei A.   +4 more
core   +1 more source

The Geometry of PSR B0031-07 [PDF]

, 2007
PSR B0031-07 is well known to exhibit three different modes of drifting sub-pulses (mode A, B and C). It has recently been shown that in a multifrequency observation, consisting of 2700 pulses, all driftmodes were visible at low frequencies, while at 4 ...
A. Jessner, B. W. Stappers, Bartel, D. Mitra, Edwards, Gangadhara, Gangadhara, Huguenin, Izvekova, J. Kuijpers, J. M. Smits, Joshi, Krishnamohan, Kuzmin, Mitra, Mitra, P. Weltevrede, Radhakrishnan, Ruderman, Smits, Swarup, Taylor, Thorsett, Vivekanand, Vivekanand, Vivekanand, von Hoensbroech, Voûte, Wright, Wright, Y. Gupta   +30 more
core   +5 more sources

WFH: A Wideband Frequency Hopping‐Based Anti‐Jamming Navigation Signal Structure

IET Radar, Sonar &Navigation, Volume 20, Issue 1, January/December 2026.
Given the limitations of existing satellite navigation signals in antijamming performance amid growing environmental jamming, this paper proposes a navigation signal structure based on wideband frequency hopping (WFH) modulation to enhance both antijamming capability and measurement accuracy. It further introduces the nonstationary effective carrier‐to‐
Chenyang Wang, Yihai Liao, Sicong Liu, Jianghong Shi, Ao Peng   +4 more
wiley   +1 more source

A low‐profile tri‐band shared‐aperture antenna for Sub‐6G wide‐beam and millimetre‐wave high‐gain applications

IET Microwaves, Antennas & Propagation
To achieve multi‐function integration and independent performance regulation of microwave and millimetre‐wave (mm‐Wave) shared‐aperture antennas, a design method based on embedded structure fusion is proposed.
Chuang Wang, Wenquan Cao, Yangkun Zhu, Yixin Tong   +3 more
doaj   +1 more source

An NSCT-Based Multifrequency GPR Data-Fusion Method for Concealed Damage Detection

Buildings
Ground-penetrating radar (GPR) is widely employed as a non-destructive tool for subsurface detection of transport infrastructures. Typically, data collected by high-frequency antennas offer high resolution but limited penetration depth, whereas data from
Junfang Wang, Xiangxiong Li, Huike Zeng, Jianfu Lin, Shiming Xue, Jing Wang, Yanfeng Zhou   +6 more
doaj   +1 more source

Antenna-assisted picosecond control of nanoscale phase transition in vanadium dioxide [PDF]

, 2016
Nanoscale devices in which the interaction with light can be configured using external control signals hold great interest for next-generation optoelectronic circuits.
A Cavalleri, A Pashkin, A Tittl, AKU Michel, AKU Michel, B Gholipour, BT O’Callahan, C Ríos, D Wegkamp, DJ Hilton, DJ Shelton, DW Ferrara, DY Lei, DY Lei, F Sterl, JA Schuller, JB Khurgin, JM Gaskell, K Appavoo, K Appavoo, K Shportko, M Abb, M Hada, M Seo, MA Kats, MJ Dicken, MK Liu, MM Qazilbash, N Strohfeldt, NI Zheludev, P Kühler, Q Wang, RF Waters, S Cueff, S Hosaka, T Driscoll, TV Son, UK Chettiar, Z Yang, ZJ Thompson   +39 more
core   +2 more sources

Quad-band internal mobile phone antenna [PDF]

, 2007
A novel internal, quad-band antenna placed inside a ‘foldable’ type of Mobile Phone is presented. Its structure consists of a helical and a monopole element exciting two broad frequency bands.
Langley, R.J., Tzortzakakis, M.
core   +1 more source

Spectral Density Function Analysis Reveals Coupled Relaxation and Resonance Modes in Fluorinated Elastomers: Comparison With Semicrystalline Poly(tetrafluoroethylene)

Magnetic Resonance in Chemistry, Volume 63, Issue 12, Page 1075-1082, December 2025.
We used static‐gradient 19F NMR imaging to compare molecular dynamics in semicrystalline polytetrafluoroethylene (PTFE) and amorphous fluorinated elastomer films. PTFE shows depth‐dependent motion, while the elastomer exhibits uniform dynamics with resonance‐like peaks in its spectral density, suggesting intrinsic vibrational modes.
Natsuki Kawabata, Naoki Asakawa, Teruo Kanki   +2 more
wiley   +1 more source

MODIFIED Π-SHAPED SLOT LOADED MULTIFREQUENCY MICROSTRIP ANTENNA

Progress In Electromagnetics Research B, 2015
A single layer, single feed microstrip antenna with multifrequency operation in compact size is proposed. A modified inverted π-shaped slot is introduced at the left side radiating edge of the patch to reduce the size of the antenna by reducing the resonant frequency.
Sudipta Das, Partha Pratim Sarkar, Santosh Kumar Chowdhury   +2 more
openaire   +1 more source