This letter presents a switchable frequency-selective rasorber (SFSR) with two operating modes. Switching from transmission to reflection can be achieved by appropriately adding feeders and PIN diodes based on cascaded two-dimensional lossy lossless surface screens. The proposed SFSR realize out-of-band absorption. Analysis of the equivalent circuit model useful for achieving rasorber. As state...

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Hedayat and Yang earlier proved that balanced uniform designs in the entire class of crossover designs based on t treatments, n subjects, and pD t periods are universally optimal when n· t .t ¡ 1/=2. Surprisingly, in the class of crossover designs with t treatments and p D t periods, a balanced uniform design may not be universally optimal if the number of subjects exceeds t .t ¡ 1/=2. This art...

Manufacturers launch new product models at various time increments to meet changing market requirements over time. At each design period, product design and price may change. While price decisions can be made at product launching time, redesign decisions must be made in advance. Real options theory addresses such time gap decisions. This paper presents a real options approach with a binomial la...

A t-(v; k;) design D is a system (multiset) of k-element subsets (called blocks) of a v-element set V such that every t-element subset of V occurs exactly times in the blocks of D. A t-(v; k;) design D is called inde-composable (or elementary) if and only if there is no subsystem which is a t-(v; k; 0) design with 0 < 0 <. It is known that the number of inde-composable designs for given paramet...

A spherical t-design is a set of points on the unit sphere that are nodes of a quadrature rule with positive equal weights that is exact for all spherical polynomials of degree ≤ t. The existence of a spherical t-design with (t + 1)2 points in a set of interval enclosures on the unit sphere S2 ⊂ R3 for any 0 ≤ t ≤ 100 is proved in [17, Chen, Frommer, Lang, Computational existence proofs for sph...