This paper consists of three sections. In the first section an efficient method is used for decomposition of the canonical matrices associated with repetitive structures. to this end, cylindrical coordinate system, as well as a special numbering scheme were employed. In the second section, divide and conquer method have been used for eigensolution of these structures, where the matrices are in ...

In this paper we consider D-optimal and highly D-efficient chemical balance weighing designs. The errors are assumed to be equally non-negatively correlated and to have equal variances. Some necessary and sufficient conditions under which a design is D*-optimal design (regular D-optimal design) are proved. It is also shown that in many cases D*-optimal design does not exist. In many of those ca...

This paper presents an approach to the design and optimization of a new type millimeter-wave micro-electromechanical system (MEMS) phase shifter, using a genetic algorithm. Initial results show that a MEMS phase shifter with 32 30μmwidth bridges spaced at 300μm (total length = 10.56mm) can achieve 120°/dB at 35GHz and 148.5°/dB at 60GHz. Further work will be done on more complicated MEMS struct...

In recent years, high-speed wireless communication is in vogue. In wireless communication systems, multipath fading, delay and interferenc occurres by reflection or diffraction. In a high-speed wireless communication, it becomes a necessary to separate desired signal from delay or interference signal. Thus to overcome these problems Smart antenna systems have been developed. Basically there are...

The geometric analysis and the design execution process of springs starred vault that covers Chapel Lonja de los Mercaderes in Valencia (Spain), built late 15th century is subject study research this paper. other vaults are also mentioned, such as one covered chapter house Valldigna monastery (Simat, Valencia) or those church San Bartolomé Jávea (Alicante). geometry basket arches start from spr...