in this article, the effect of cells' radius on the behavior of wavelength switching optical filter andthe effect of the radius of the optical filters' key characteristics such as wavelength resonance onan optical filter based on photonic crystals, have been investigated. currently, the most commonapplied mechanism for designing optical filter based on photonic crystals is using twome...

We describe the current status of two complementary programs to search for objects with strong emission lines in a ∼ 300 Å gap, centered at 9150 Å, in the strong airglow emission. Both programs are being carried out with LRIS on the Keck II telescope. The first of these uses broad-band and narrow-band filter photometry to select candidates, followed by multi-slit spectroscopy through the same n...

In this paper, we review some basic definitions and properties of FIR filters. We also discusses different types of realizations of digital FIR filters and their uses in some typical applications. We then present some basic building blocks for SC filters. Of particular interest are static and dynamic memory SC circuits, based on SC integrators. These building blocks are the basis for many types...

ID: 8312 Title: The use of dual-energy CT images for Monte Carlo treatment planning: material extraction and metal artifact reduction Purpose: To investigate the feasibility of dual-energy CT-based material extraction (DECT) for Monte Carlo (MC) dose calculations, to evaluate metal streaking artifact reduction using DECT and to propose a novel scanning technique for motion artifacts reduction. ...

ÐThis article presents a mathematical definition of textureÐthe Julesz ensemble …h†, which is the set of all images (defined on Z) that share identical statistics h. Then texture modeling is posed as an inverse problem: Given a set of images sampled from an unknown Julesz ensemble …h †, we search for the statistics h which define the ensemble. A Julesz ensemble …h† has an associated probability...

In this paper, a method of using a one-dimensional position-sensitive detector (PSD) by replacing charge-coupled device (CCD) to measure the movement of the interference fringes is presented first, and its feasibility is demonstrated through an experimental setup based on the principle of centroid detection. Firstly, the centroid position of the interference fringes in a fiber Mach-Zehnder (M-Z...

ÐThis article presents a mathematical definition of textureÐthe Julesz ensemble …h†, which is the set of all images (defined on Z) that share identical statistics h. Then texture modeling is posed as an inverse problem: Given a set of images sampled from an unknown Julesz ensemble …h †, we search for the statistics h which define the ensemble. A Julesz ensemble …h† has an associated probability...

We consider the problem of spatiotemporal sampling in an evolutionary process x = Ax where an unknown linear operator A driving an unknown initial state x is to be recovered from a combined set of coarse spatial samples {x|Ω0 , x |Ω1 , · · ·, x |ΩN }. In this paper, we will study the case of infinite dimensional spatially invariant evolutionary process, where the unknown initial signals x are m...

In the design of IIR digital filters, the method that utilizes the classic analog filter design theory to design analog filters and then obtain the corresponding digital filters by s–z transformation is well-known. However, IIR digital filters obtained via the bilinear s–z transformation have just equal-order numerator and denominator. Having unequal-order numerator and denominator will give mo...

A new set of wavelet filter families has been added to the systematized collection of Daubechies wavelets. This new set includes complex and real, orthogonal and biorthogonal, least and most disjoint families defined using constraints derived from the principle of separably disjoint root sets in the complex z-domain. All of the new families are considered to be constraint selected without a sea...