this study was carried out to determine nitrogen, phosphorus, and potassium contents of rangeland plants using spectral reflectance value. the measurements were made in 1 m2 area of different parts of a rangeland. a portable spectroradiometer capable of measuring the wavelength range of 325-1,075 nm of the electromagnetic spectrum was used to collect spectral data. spectral measurements were ma...

it is well-known that dam-reservoir interaction has significant effects on the response of dams to the earthquakes. this phenomenon should be considered more exactly in the seismic design of dams with a rational and reliable dynamic analysis method. in this research, seismic analysis of the dam-reservoir is studied as a wave propagation problem by using legendre spectral element method (sem). t...

let ‎x be an ‎‎n-‎‎‎‎‎‎square complex matrix with the ‎cartesian decomposition ‎‎x = a + i ‎b‎‎‎‎‎, ‎where ‎‎a ‎and ‎‎b ‎are ‎‎‎n ‎‎times n‎ ‎hermitian ‎matrices. ‎it ‎is ‎known ‎that ‎‎$vert x vert_p^2 ‎leq 2(vert a vert_p^2 + vert b vert_p^2)‎‎‎$, ‎where ‎‎$‎p ‎‎geq 2‎$‎ ‎and ‎‎$‎‎vert . vert_p$ ‎is ‎the ‎schatten ‎‎‎‎p-norm.‎ ‎‎ ‎‎in this paper‎, this inequality and some of its improvements ...

A zero-mean homogeneous random field is defined on a discrete polar raster. Given sample values inside a disk of finite radius, we wish to estimate the field’s power spectral density using linear prediction. Issues arising here include estimation of covariance lags and extendibility of a finite set of lag estimates into a positive semidefinite covariance extension (required for a meaningful spe...

This supplement is directly tied to a Technical Note that appears in the July/August 2006 issue of Computing in Science & Engineering (the full citation is J. Cornette, “Gauss-Vaníček and Fourier Transform Spectral Analysis of Marine Diversity,” vol. 9, no. 4, 2007, pp. 61–63). In the Technical Note, I compared Gauss-Vaníček spectral analysis of 542 million years of marine diversity with a Four...

In many practical applications second order moments are used for estimation of power spectrum. This can be cast as an inverse problem where we seek a spectrum consistent with a given state-covariance matrix. Such a solution exists if and only if the covariance matrix is positive and belong to a low dimensional subspace. The sample covariance estimate of such a matrix will typically fall outside...