Adhesion force and contact angle measurements between an aqueous solution of the nonionic surfactant TN 101 and silica surface have been studied. The variation of the contact angle is a function of the adsorption of the surfactant at the liquid-vapor, solid-liquid, and solid-vapor interfaces. The co
Experimental verification of the relation between the radar cross section and the list angle of surface vessels
✍ Scribed by J. F. Pérez Ojeda; J. L. Rodríguez; I. García-Tuñón; F. Obelleiro
- Publisher
- John Wiley and Sons
- Year
- 2006
- Tongue
- English
- Weight
- 685 KB
- Volume
- 48
- Category
- Article
- ISSN
- 0895-2477
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✦ Synopsis
Abstract
In this paper, the effect of ship angular motions on the radar cross section is addressed. To this end, a set of measurements for different ships were conducted from a shore‐based instrumental radar. The targets execute oblique straight trajectories with respect to the radar line of sight with induced roll. The analysis of the dependence between target reflectivity and the roll angle shows that, for conventional vessels, the maximum response at low grazing angles is achieved in steady conditions, and it varies significantly according to the sign of the roll angle referred to the radar location. This result is confirmed by the comparison of measurements of a ship performing turning circles at several speeds, thus inducing different roll angles. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2237–2241, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21932
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