Results 261 to 270 of about 946,560 (297)

Performance of a cylindrical hydrophone array for practical use

2017 IEEE International Conference on Signal Processing, Communications and Computing (ICSPCC), 2017
Cylindrical arrays are widely used in sonar systems for underwater target detection. For the sake of reducing calculation, each line of hydrophones at the same azimuth direction aligned with the cylinder axis are hardwired together in practice and thus, each line array with omnidirectional sensors becomes a directional sensor steered to broadside. As a
Shaohao Zhu, Yixin Yang, Yong Wang, Qiulong Yang, Xidang Yan   +4 more
openaire   +2 more sources

Periodic Arrays of Interfacial Cylindrical Reverse Micelles

Langmuir, 2005
We report an approach for the fabrication of periodic molecular nanostructures on surfaces. The approach involves biomimetic self-organization of synthetic wedge-shaped amphiphilic molecules into multilayer arrays of cylindrical reverse micelles. The films were characterized by atomic force microscopy and X-ray reflectivity.
Mark, Nelson, Nicholas, Cain, Chad E, Taylor, Benjamin M, Ocko, Douglas L, Gin, Scott R, Hammond, Daniel K, Schwartz   +6 more
openaire   +2 more sources

A Scanning Switch Matrix for a Cylindrical Array

MTT-S International Microwave Symposium Digest, 2005
A full-commutating scanning switch matrix has been implemented for a 96-element C-band cylindrical array. The impact of cost/performance tradeoffs on the resulting configuration is discussed.
K.J. Keeping, D.S. Rogers, J-C. Sureau
openaire   +1 more source

Radiation characteristics of cylindrical microstrip arrays

IEEE Antennas and Propagation Society International Symposium. 1999 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.99CH37010), 2003
For microstrip arrays mounted on a cylindrical surface, several related studies have been reported, and most of the work emphasizes the design and characterization of N-element wraparound arrays (1/spl times/N arrays) for omnidirectional radiation in the roll plane of the cylindrical host.
null Gui-Bin Hsieh, null Kin-Lu Wong
openaire   +1 more source

Modeling of small-size cylindrical arrays

17th International Conference on Applied Electromagnetics and Communications, 2003. ICECom 2003., 2004
The possibility for modeling and analysis of small-size cylindrical arrays with Ansoft/sup /spl reg// 3D EM simulation software (HFSS) is presented. The antenna consists of 160 microstrip patches mounted over a cylindrical body with radius 9.1 cm. The radiators are spaced in Cartesian grid and cover the arc of 123/spl deg/.
G. Bozmarova, V. Peshlov, I. Slavkov
openaire   +1 more source

A plate-array metamaterial in cylindrical geometries

2023
A metamaterial composed of closely-spaced, thin metallic plates, sandwiched between layers of dielectric, is modelled for the purposes of engendering hierarchical photonic crystals along one- and two-axes. The plate-array is considered infinite in its depth but is made to occupy a circular cross-section, so as to define a plate-array metamaterial ...
openaire   +1 more source

Cold compaction of an array of cylindrical fibres

International Journal of Mechanical Sciences, 2001
The biaxial compaction of a square array of circular cylinders is studied using slip-line "eld, upper bound and "nite element methods. Densi"cation is assumed to occur by plastic deformation at the contacts. It is found that contact}contact interaction has a softening e!ect on the local indentation pressure at each contact. The yield surfaces resulting
Sridhar, I., Fleck, N. A., Akisanya, A. R.   +2 more
openaire   +1 more source

A new technique for feeding a cylindrical array

IEEE Transactions on Antennas and Propagation, 1975
A new technique for exciting a cylindrical array is described. It uses a Butler matrix and a simple switching matrix for exciting only that sector of the array that contributes to formation of a desired radiation pattern. It accomplishes full circumferential coverage with fewer active components, reduced complexity, and better performance than other ...
G. Skahill, W. White
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Cylindrical arrays with electronic beam scanning

Proceedings of the Institution of Electrical Engineers, 1965
This paper describes methods for enabling the directional pattern of a cylindrical array to scan continuously and repetitively through 360° by electronic means. This requires that the circular aperture distribution corresponding to the far-field directional pattern should be subjected to rotation relative to the fixed array.
D.E.N. Davies, B.S. McCartney
openaire   +1 more source

Adaptive Nulling with a Cylindrical Array

1999
Abstract : A genetic algorithm is used to adaptively place a sidelobe null using a cylindrical array antenna. Results show that a null can be placed down to the noise floor of the measurement system within 20 to 50 power measurements. This approach to adaptive nulling is a viable means of quickly placing a null in the sidelobes of a phased array ...
openaire   +1 more source