lexicographic ordering by spectral moments ($s$-order) among all trees is discussed in this‎ ‎paper‎. ‎for two given positive integers $p$ and $q$ with $pleqslant q$‎, ‎we denote $mathscr{t}_n^{p‎, ‎q}={t‎: ‎t$ is a tree of order $n$ with a $(p‎, ‎q)$-bipartition}‎. furthermore, ‎the last four trees‎, ‎in the $s$-order‎, ‎among $mathscr{t}_n^{p‎, ‎q},(4leqslant pleqslant q)$ are characterized‎.

in this paper some upper and lower bounds for the greatest eigenvalues of the pi and vertex pimatrices of a graph g are obtained. those graphs for which these bounds are best possible arecharacterized.

the study aimed to investigate the adsorption mechanism of di-n-butyl phthalate (dbp) onbrown soil and red soil in shenyang and hunan province, respectively, china. adsorption kinetics andisotherms experiments were conducted at 288, 298 and 308 k, respectively. results of kinetics showed thatadsorption of dbp exhibited a two-step process in both brown and red soil. different models were used to...

the spectroscopic properties of the 2,2,6,6-tetramethyl-piperidine-1-oxyl (tempo) radicalderivatives of the fullerene (c60) were theoretically investigated. the ground state optimizedstructures of the radical adducts of the fullerene were calculated by using dft (b3lyp) with 6-31g(d) level. it was concluded that a 6-6 ring junction of c60 moiety generally covalently links to thepiperidine ring ...

The exponential growth of global capacity along with a reduction in manufacturing costs the last two decades has caused photovoltaic (PV) energy technology to reach high maturity level. As consequence, currently, researchers from all over world are making great efforts analyse how different types degradation impact this technology. This study provides detailed review optical mechanisms, which m...

Reliable signal acquisition with low computational complexity is an important design objective for the evolution of global navigation satellite systems (GNSS). Most GNSS signals consist long pseudorandom noise (PRN) codes whose expensive in terms memory, computation time, and energy. As these resources are particularly scarce emerging mass-market user segment, cyclostationary pilot short PRN ...

This study revokes the performance of continuous phase modulation (CPM) able to generate a single-sideband (SSB) spectrum directly. signal is analyzed in terms indices, pulse lengths, and widths, all which affect error probability, bandwidth, SSB property, receiver complexity. The probability based on an approximation minimum Euclidean distance. A numerical power spectral density calculation fo...