Results 31 to 40 of about 163,730 (266)

Radio-Wave Propagation and Electromagnetic Surface Waves [PDF]

Proceedings of the National Academy of Sciences, 1947
A Discrepancy and Its Resolution. - The problem of the propagation of radio-waves along the surface of the (plane) earth was first treated in a celebrated paper by A. Sommerfeld (1909).(1) Let the (r, φ)-plane of a cylindric system of coordinates coincide with the plane of the earth surface and let the z-axis point vertically upward.
openaire   +3 more sources

Multiple Bloch surface wave excitation with gratings

Journal of the European Optical Society-Rapid Publications
We study the coupling of a finite number of Bloch Surface Waves (BSWs) propagating in different directions at the surface of a dielectric multilayer. These surface waves arise from a set of diffraction orders associated to a grating on the bottom surface
Asilevi Atsu L., Descrovi Emiliano, Pesonen Henri, Roussey Matthieu, Turunen Jari   +4 more
doaj   +1 more source

Surface waves and surface wave devices in atmospheric acoustics [PDF]

The Journal of the Acoustical Society of America, 1990
Surface waves exist above porous grounds when the surface can influence the airborne particle velocity near the ground and reduce the phase velocity of sound waves in air at the surface, thereby trapping some of the energy to remain near the surface as the wave propagates. The experimental evidence for the existence of an acoustic surface wave has been
G. A. Daigle, T. F. W. Embleton
openaire   +1 more source

S1222a—The Largest Marsquake Detected by InSight

Geophysical Research Letters, 2023
NASA's InSight has detected a large magnitude seismic event, labeled S1222a. The event has a moment magnitude of MWMa4.7, with five times more seismic moment compared to the second largest event.
Taichi Kawamura, John F. Clinton, Géraldine Zenhäusern, Savas Ceylan, Anna C. Horleston, Nikolaj L. Dahmen, Cecilia Duran, Doyeon Kim, Matthieu Plasman, Simon C. Stähler, Fabian Euchner, Constantinos Charalambous, Domenico Giardini, Paul Davis, Grégory Sainton, Philippe Lognonné, Mark Panning, William B. Banerdt   +17 more
doaj   +1 more source

Surface Wave, Skin Effect, and Per Unit Length Parameters of the Single-Wire Transmission Line at Low Frequency, for Nonmagnetic and Magnetic Wires

IEEE Access, 2023
Surface wave technology for high-speed communications is a current research topic aimed to respond to increasing data rate demands on existing copper infrastructures.
Jose A. Brandao Faria, Rodolfo Araneo, Erika Stracqualursi   +2 more
doaj   +1 more source

Modulation of Surface Elastic Waves and Surface Acoustic Waves by Acoustic–Elastic Metamaterials

Crystals
Metamaterials enable the modulation of elastic waves or acoustic waves in unprecedented ways and have a wide range of potential applications. This paper achieves the simultaneous manipulation of surface elastic waves (SEWs) and surface acoustic waves ...
Chang Fu, Tian-Xue Ma
doaj   +1 more source

Complex dynamics in nonlinear small time-delayed optoelectronic oscillator and application in fast reservoir computing and pulse generation

Scientific Reports
We investigated a time-delayed optoelectronic oscillator (OEO) that displays a wide range of complex dynamic behavior under small time delay. The phase-space trajectory distributions in different dynamic regimes were compared which brings a new ...
Dengfei Tang, En Liang, Qiuyi Lu, Haibin Zhao, Ziwei Li   +4 more
doaj   +1 more source

Neural network technology for identifying defect sizes in half-plane based on time and positional scanning

Advanced Engineering Research, 2020
Introduction. The selected research topic urgency is due to the need for a quick assessment of the condition and reliability of materials used in various designs.
A. N. Solov'ev, A. V. Cherpakov, P. V. Vasil’ev, I. A. Parinov, E. V. Kirillova   +4 more
doaj   +1 more source

Hijacking emergency granulopoiesis: Neutrophil ontogeny and reprogramming in cancer

Molecular Oncology, EarlyView.
Neutrophils are highly plastic innate immune cells; their functions in cancer extend beyond the tumour microenvironment. This Review summarises current understanding of neutrophil maturation and heterogeneity and highlights tumour‐induced granulopoiesis as a systemic programme that expands immature, immunosuppressive neutrophils via tumour‐derived ...
Gabriela Marinescu, Yi Feng
wiley   +1 more source

Classification of River Sediment Fractions in a River Segment including Shallow Water Areas Based on Aerial Images from Unmanned Aerial Vehicles with Convolution Neural Networks

Remote Sensing, 2023
Riverbed materials serve multiple environmental functions as a habitat for aquatic invertebrates and fish. At the same time, the particle size of the bed material reflects the tractive force of the flow regime in a flood and provides useful information ...
Mitsuteru Irie, Shunsuke Arakaki, Tomoki Suto, Takuto Umino   +3 more
doaj   +1 more source