Results 71 to 80 of about 124,500 (193)

Residual Resistance of Displacement Vessels

open access: yesJournal of Marine Science and Engineering, 2020
The hydrodynamics of the residual resistance of ships is formulated for the first time: the residual resistance of vessel displacement is the result of the formation of retaining bow waves, Kelvin wave systems and their interaction—as well as the action ...
Ada Gotman
doaj   +1 more source

Astrophysical bow shocks: An analytical solution for the hypersonic blunt body problem in the intergalactic medium

open access: yes, 2011
Aims: Bow shock waves are a common feature of groups and clusters of galaxies since they are generated as a result of supersonic motion of galaxies through the intergalactic medium. The goal of this work is to present an analytical solution technique for
Blondin   +9 more
core   +1 more source

Magnetic susceptibility of alkali-TCNQ salts and extended Hubbard models with bond order and charge density wave phases

open access: yes, 2011
The molar spin susceptibilities $\chi(T)$ of Na-TCNQ, K-TCNQ and Rb-TCNQ(II) are fit quantitatively to 450 K in terms of half-filled bands of three one-dimensional Hubbard models with extended interactions using exact results for finite systems.
Benjamin J. Topham   +6 more
core   +1 more source

Evidence for transient, local ion foreshocks caused by dayside magnetopause reconnection [PDF]

open access: yesAnnales Geophysicae, 2016
We present a scenario resulting in time-dependent behaviour of the bow shock and transient, local ion reflection under unchanging solar wind conditions.
Y. Pfau-Kempf   +10 more
doaj   +1 more source

An Improved Modified Universal Ultra-Wideband Antenna Designed for Step Frequency Continuous Wave Ground Penetrating Radar System

open access: yesSensors, 2019
Step Frequency Continuous Wave Ground Penetrating Radar (SFCW-GPR), as a tool for nondestructive testing of shallow soil surface targets, the realization of the function of SFCW-GPR is mainly based on the theory of refraction, reflection and scattering ...
Yuxuan Wu   +3 more
doaj   +1 more source

Torsional waves in a bowed string

open access: yes, 2005
Bowing a string with a non-zero radius exerts a torque, which excites torsional waves. In general, torsional standing waves have higher fundamental frequencies than do transverse standing waves, and there is generally no harmonic relationship between them. Although torsional waves have little direct acoustic effect, the motion of the bow-string contact
Bavu, Eric, Smith, John, Wolfe, Joe
openaire   +3 more sources

Study on the parametric roll characteristics of ships under bow oblique waves

open access: yesZhongguo Jianchuan Yanjiu
ObjectiveParametric roll is a common stability loss mode considered in the international maritime organization (IMO) second-generation intact stability framework, most often occurring in head or following seas.
Wuyang LIU   +4 more
doaj   +1 more source

Larvae sense bow wave for swift exit [PDF]

open access: yesJournal of Experimental Biology, 2014
![Figure][1] Zebrafish ( Danio rerio ) larva attempting to evade an adult. Photo credit: William Stewart. If you can't get out of the way fast when you're tiny, there's little hope for your future and even less for your offspring.
openaire   +1 more source

A Broadband Bow-Tie Cavity-Backed Slot for Traveling-Wave Arrays in the Millimeter-Wave Band [PDF]

open access: yes, 2019
The use of bow-tie geometries to enhance the characteristics of a radiating element previously proposed by the authors is presented. The previous element consisted of a broadband cavity-backed slot in transmission configuration. The bow-tie shape of the
Abdo Sánchez, Elena   +2 more
core  

High Gain Bow-Tie Slot Antenna Array Loaded With Grooves Based on Printed Ridge Gap Waveguide Technology

open access: yesIEEE Access, 2019
The development of wireless and satellite communication has led to a demand for high-performance microwaves and mm-wave components in terms of cost, losses, and fabrication complexity.
Syed M. Sifat   +3 more
doaj   +1 more source

Home - About - Disclaimer - Privacy