In present work a compound holographic system consisting of a diffraction grating and a holographic lens has been fabricated to disperse and focus different portion of solar spectrum on laterally arranged solar cells of different band gaps to achieve maximum efficiency operation. Such concentrators are light–weight, low-cost and do not require tedious processing for their mass production.

Wt> f~rirsire the goal of tran.sf~arent~y &striGuling object-oriented fuwgrwr~.~ by consbrircting a systerfi of arrdictr-y ot5j’ect.s rrhich behace like refweventatices qf the original chs.se.s of tfw pmgrarri. Thy are rtn oh&toriented e.ztension of the well-known u.strlb rnorlrdes “. The he.st way o~designing these au.xilia~ objects i.s to hoe therri mirror the iri heritance stmctrire of tfie ...

Instead of having a similarity metric to classify a sentence (or parts of it) decomposition is used as a method fox classification. In order to determine the similarity of a complex sentence and some cases in the case base abstraction by means of decomposition and reduction seems an appropriate means s. rI agree with the comment of an anonymous reviewer that a more thorough linguistic analysis ...

The dynamic topology of ad hoc networks makes route discovery and reconstruction a non-trivial task. In this work we propose the use of mobility prediction to assist in ad hoc routing. A method of route discovery and route reconstruction using the sectorized mobility prediction technique is presented. Simulation and analytical results of the proposed routing strategy find it to offer considerab...

Chittagong Hill Tracts (CHT) is situated in the Southeast of Bangladesh covering about 10 per cent of the total land. It is the native hoe of 13 tribal communities and these communities have their own traditional knowledge for natural resource managements. This paper provides 8 traditional knowledge namely, folk classification of landform, land use zoning, community reserve for common resource ...

Large-area three-dimensional Penrose-type photonic quasicrystals are fabricated through a holographic lithography method using a lab-made diffractive optical element and a single laser exposure. The diffractive optical element consists of five polymer gratings symmetrically orientated around a central opening. The fabricated Penrose-type photonic quasicrystal shows ten-fold rotational symmetry....

This paper demonstrates an approach for laser holographic patterning of three-dimensional photonic lattice structures using a single diffractive optical element. The diffractive optical element is fabricated by recording gratings in a photosensitive polymer using a two-beam interference method and has four diffraction gratings oriented with four-fold symmetry around a central opening. Four firs...

A volume hologram has two degenerate Bragg-phase-matching dimensions and provides the capability of volume holographic imaging. We demonstrate two volume holographic imaging architectures and investigate their imaging resolution, aberration, and sensitivity. The first architecture uses the hologram directly as an objective imaging element where strong aberration is observed and confirmed by sim...