Wyniki wyszukiwania - BazTech

1

Antenna for marine radar with supperdirectivity properties

Koshevyy V. M., Shevchenko A. A.

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

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2020

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Vol. 14, no. 2

317--324

EN

The reception antenna diagram side lobe’s level suppression algorithm for marine radar by means of antenna array with only a few tuning elements of antenna array is considered. The others no tuning elements of array are choosing for obtain a given value of average side lobe level suppression and with given value of antenna directivity without using of numerical optimization procedures. Special algorithm of interaction of these no tuning elements for realizing Supperdirectivity properties is used. The structural diagram of array is presented. The efficiency of suggested design has been investigated.

2

Influence of RCS process on the structure and mechanical properties of CuSn6 alloy

Kwaśny W., Nuckowski P., Rdzawski Z., Głuchowski W.

Archives of Materials Science and Engineering

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2013

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Vol. 62, nr 2

60--66

EN

Purpose: The goal of the study is try to find the influence of plastic deformation using the RCS (repetitive corrugation and straightening) process on the structure and mechanical properties of CuSn6 alloy. The influence of process parameters on the above property were investigated. Obtained results were correlated with the results obtained for alloy subjected to cold rolling. Design/methodology/approach: This study was aimed to investigate structure and mechanical properties non annealed strip of CuSn6 alloy, cold-rolled and the tape subjected to intensive plastic deformation using the RCS method (repetitive corrugation and straightening). Findings: Research have shown increase compressive stresses and tensile strength in material after RCS process compared to classic rolled. Crystallite size measurement confirmed the presence of nano-scale structures in the studied materials after deformation by RCS process. The used method of plastic deformation is promising for development materials with improved properties. Research limitations/implications: The research was carried out on samples, not on final elements. Practical implications: Research is moving towards the development of the materials with finest microstructure, known as ultra-fine-grained materials with improved properties, compared to currently known materials. Originality/value: This paper presents the results of study of the structure and mechanical properties CuSn6 alloy deformed in the RCS (repetitive corrugation and straightening) process.

3

Metodyki pomiarów parametrów materiałów absorpcyjnych

Przesmycki R., Nowosielski L., Wnuk M., Bugaj M., Piwowarczyk K.

Elektronika : konstrukcje, technologie, zastosowania

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2012

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Vol. 53, nr 5

69-74

PL

Artykuł dotyczy problemów związanych z pomiarami absorpcji materiałów pochłaniających fale elektromagnetyczne. Przedstawiono w nim metodologie pomiarów oraz opis stanowisk do pomiaru parametrów materiałów absorpcyjnych. Zamieszczono w nim również wyniki pomiarów przeprowadzonych zgodnie z opracowanymi metodologiami dla płyt metalowych z naniesionym przykładowym materiałem absorpcyjnym.

EN

The paper concerns the problems connected witch measurement of electromagnetic wave absorption of absorbing materials. In the article are presented the measurement methodology and laboratory stands description. The measurements results for flat steel panel coated with absorbing material example are presented too.

4

The selection of artificial corner reflectors based on RCS analysis

Li C., Yin J., Zhao J., Zhang G., Shan X.

Acta Geophysica

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2012

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Vol. 60, no. 1

43-58

EN

Artificial corner reflectors (ACRs) are widely applicable in monitoring terrain change via interferometric synthetic aperture radar (InSAR) remote sensing techniques. Many different types are available. The choice of the most appropriate ones has recently attracted scholarly attentions. Based on physical optics methods, via calculating the radar cross section (RCS) values (the higher the value, the better the detectability), the current study tested three ACRs, i.e., triangular pyramidal, rectangular pyramidal and square trihedral ACRs. Our calculation suggests that the square trihedral ACR produces the largest RCS but least tolerance towards incident radar ray’s deviation from optimal angle. The triangular pyramidal trihedral ACR is the most geometrically stable ACR, and has the highest tolerance towards incident radar ray’s deviation. Its RCS values, however, are the least of the three. Due to the high cost of deploying ACRs in the fields, the physical optics method seems to provide a viable way to choose appropriate ACRs.