Petri net approach to the evaluation of maximum compatible classes in data path optimization of modern computers

A Petri not (PN) interpretation has been given to the problem of finding Maximum compatible classes (MCCs) of the data transfers with respect to the data paths for the data patli optimization of modern computers. The generation of these MCCs has been identified as being identical to obtaining the solution for one of the classes of Murata's state equation of PN.     

BUBBLE FREQUENCY AND DISTRIBUTION IN FLUIDIZED BEDS

The distribution of bubbles and the rate of coalescence of bubbles are important factors in the overall behaviour of fluidized beds. A simple model capable of predicting bubble distribution and bubble-size distribution is most desirable. Stages in the development of such a simple model are presented. Early studies examined coalescence and related bubble properties in two-dimensional beds and led to the formulation of a simple computer model for two-dimensional beds. The work was then extended to three-dimensional beds covering the following cases: (i) a single orifice; (ii) a row of orifices in a line and (iii) orifices arranged in a plane. Reasonable agreement with experimental data was obtained for cases (i) and (iii), there being no data available for (ii). The present program is probably adequate for engineering purposes, so far as the prediction of bubble sizes and bubble distribution is concerned, in fluidized beds without internals, although some qualifications are still necessary.     

Various approaches to speed up Mahalanobis distance classifier

In this paper, we propose various approaches to reduce the CPU time requirement of Mahalanobis distance classifier (MDC). Based on the results discussed in this paper, we have found that the Ensemble average approach and Quadratic form range theorem are superior to other algorithms. The algorithms based on these two approaches are found to give a maximum speed of 7 and 9 with MSS and TM data, respectively.     

Spectral response of rice crop and its relation to yield and yield attributes

Ground-based radiometric measurements were conducted on six varieties of rice crop during an entire growth cycle using a hand-held seven-band radiometer. Concomitant measurements of some of the yield attributes were also made. Spectral data were also collected on a single variety grown under 12 different fertilizer treatments. Spectral data have been correlated with leaf area index, total wet biomass, total dry biomass, plant water content and final grain, straw and total yield. The results show similar temporal spectral responses of all six varieties and a strong correlation of agronomic parameters with spectral parameters derived from the near-infrared and red radiances. Red and near-infrared radiance ratio and normalized differences were found sensitive to the N fertilizer application but not to the P and K fertilizers. Linear correlations were observed between spectral parameters and final grain, straw and total yield     

The utility of LANDSAT imagery as an integral part of the data base for small-scale soil mapping

Abstract

A soil map of parts of the Bundelkhand region and its adjoining areas in Uttar Pradesh (northern India), covering an area of 41 000 km², was prepared following a collative approach that used visual interpretation of LANDSAT imagery in conjunction with lithological, topographical and other collateral data and information from field work. The soil map was found to be better than the conventional map in terms of soil landscape boundary delineation. The study has demonstrated the usefulness of LANDSAT imagery for small-scale soil mapping. An overall accuracy of 93-3 per cent with respect to soil landscape boundary delineation has been achieved.     

Effect of shadows cast by vertical protrusions on AVHRR data

The effect of shadows cast by vertical protrusions on AVHRR data has been investigated. The AVHRR channel-1 data from the same ground area imaged from various viewing angles are examined. These data were obtained from nine orbits during eight successive days. The atmospheric effects were removed and an analysis of the resulting surface-leaving radiance shows that the effect of shadows is an important factor contributing to off-nadir viewing effect on the remotely sensed data.     

Helical antenna for satellite transmission†

The use of helical antennas for satellite transmission is proposed. The polar diagram, directivity and polarization characteristics are outlined. The advantages of circularly and elliptically polarized waves transmitted from the helical antenna for Faraday rotation experiments are discussed. The use of helical array is comparatively more compact, radiation characteristics are frequency independent and the polarization of the radiated wave is more stable. These features enable an accurate measurement of the Faraday rotation which is likely to yield a better estimate of total electron content.     

A computationally efficient approach for template matching-based image registration

Image registration using template matching is an important step in image processing. In this paper, a simple, robust and computationally efficient approach is presented. The proposed approach is based on the properties of a normalized covariance matrix. The main advantage of the proposed approach is that the image matching can be achieved without calculating eigenvalues and eigenvectors of a covariance matrix, hence reduces the computational complexity. The experimental results show that the proposed approach performs better in the presence of various noises and rigid geometric transformations.