Recently builders have shown considerable interest in combining the features of active and passive solar space heating systems into a hybrid system employing active collection and some form of passive discharge/storage device. Ye examined the performance and economics of a hybrid2 air-based, residential system using 18.5 m of roof-mounted air collectors and a hollow-core slab that discharges di...

A new approach for synthesizing well-defined hollow nanochanneled-silica nanosphere particles is demonstrated, and the structural details of these particles are described for the first time. Positively charged styrene copolymer nanospheres with a clean, smooth surface and a very narrow size distribution are synthesized by surfactant-free emulsion copolymerization and used as a thermal sacrifici...

A unique methodology having access to Au nanorods (AuNRs)-based hollow alloy nanostructures has been developed. The syntheses and characterization of the hollow Pt-Au nanoalloys with ellipsoidal and cylindrical shapes together with a rattle-type hollow Cu-Au nanoheterostructure are described. Unlike the conventional nanoscale Kirkendall process, the formation of these AuNRs-based hollow nanostr...

This paper presents a general formulation and numerical scheme for Fractional Optimal Control Problem (FOCP) of a distributed system in cylindrical coordinate and uses a hollow cylinder with axial symmetry as the example to demonstrate the method. The fractional derivatives are expressed in the Caputo-Sense. The performance index of FOCP is considered as a function of both the state and the con...

A hollow cylinder apparatus was used to study some engineering properties of hollow cylindrical sand specimens prepared using the wet-pluviation technique. The refined specimen preparation method displayed good repeatability. Wet pluviation produced inherently cross-anisotropic specimens, with the level of initial anisotropy reducing with decreasing initial void ratio. The variation in the init...

The electromagnetic equivalence of an infinitely long loaded wire-cage structure and loaded hollow cylindrical geometry is established based on the same radiated fields under identical conditions. Analysis of the canonical infinitely long loaded wire geometries are given by treatment as boundary-value antenna prob1ems. An expression for the equivalent radius of the wire cage and an equivalent i...

The basic relations for calculating the modes of mold punching a cylindrical hollow billet under viscoplastic conditions are given. energy calculation method is used in relation to axisymmetric field displacement velocities. Theoretical calculations work material processing pressure and damage rate performed.