We characterize absorption in finite idempotent algebras by means of Jónsson absorption and cube term blockers. As an application we show that it is decidable whether a given subset is an absorbing subuniverse of an algebra given by the tables of its basic operations.

Multilayer radar absorbing materials with light weight, strong absorption, and wide absorption bandwidth are urgently demanded the increase of electromagnetic pollution. However, current design methods only simulation operation or optimization strategy not comprehensive. Here, a simulation-optimization approach including numerical calculation is proposed based on interaction between different s...

The article explores methods for detecting and tracking air targets in radar with an artificially reduced cross-section (RCS). A technique control the antenna system using adaptive method is presented, which based on adapting to conditions of information uncertainty due fluctuations excitation signal target's radar-absorbing coating. Known aircraft (active passive, do not take into account stru...

Microwave absorbing materials (MAMs) are widely researched due to their use in many practical applications including both civil and defense sectors. Irrespective of the humongous efforts various researchers, development a wide bandwidth, thin coating thickness, low-cost microwave absorber is still challenging task. The existing have not been able meet all specifications together at once require...

In this paper, absorbing Markov chain models are developed to determine the optimum process mean levels for both a single-stage and a serial two-stage production system in which items are inspected for conformity with their specification limits. When the value of the quality characteristic of an item falls below a lower limit, the item is scrapped. If it falls above an upper limit, the item is ...

Many studies have been conducted on Spinel, Garnet, and Hexa-ferrites in single multi-doped concentrations. This article is an attempt to review the researcher's work Ca, Ba, Sr hexaferrite by substituting a variety of various ions such as Al, La, Sn, Zr, Co, Cr, Ir. paper investigates M-type (Ca, Sr, Ba) with space group P63/mmc that were synthesized using techniques characterized XRD for crys...

This study investigated the prospect of using peanut shells as an alternative and green sound-absorbing material. The sound-absorption coefficients were determined after filling impedance tubes 30, 60, 90 mm in height with shells. ability increased increased, showing noise reduction coefficient (NRCs) 0.23, 0.43, 0.54 for 30-, 60-, 90-mm heights, respectively. In addition, sounds greater than 2...