zinc ions are present in different types of industrial effluents, being responsible for environmental pollution. biosorption is a process in which solids of natural origin are employed for binding heavy metals. it is a promising alternative method to treat heavy metal wastes mainly because of high metal binding capacity. the effect of some important parameters on sorption capacity of cyanobacte...

We consider using low-order rational polynomials to approximate microelectric field distribution in plasmas at varying levels of accuracy. Departing from the usual Padé prescription, we quote several such expressions providing increasing levels of approximation for the microfield distribution in an uncorrelated plasma with singly charged ions, the Holtsmark distribution. We then generalize the ...

Interaction of Pb(II) ion with modified banana shell (MBS) and banana shell (BS) during adsorption fromaqueous solution were investigated. Batch experiments were carried out to investigate the effect of contact time,pH, and IDMID ion concentration on adsorption efficiency. The favorable pll for maxim= Pb(II) adsorptionwas at 5.0. For the investigated IMOI) concentrations (10-80 mph), maximum ad...

We generalise Dwork’s theory of p-adic formal congruences from the univariate to a multi-variate setting. We apply our results to prove integrality assertions on the Taylor coefficients of (multi-variable) mirror maps. More precisely, with z = (z1, z2, . . . , zd), we show that the Taylor coefficients of the multi-variable series q(z) = zi exp(G(z)/F (z)) are integers, where F (z) and G(z) + lo...

The purpose of this paper is to obtain by different methods, and where possible to extend, the results given by Clebsch and Hillf for quintic surfaces having two distinct skew double lines. In a second paper, which will appear in an early issue of this Bulletin, I discuss a surface, due to Montesano, which has two consecutive skew double lines. The equation of a quintic surface that has xy and ...

In symmetric Macdonald polynomial theory the Pieri formula gives the branching coefficients for the product of the rth elementary symmetric function er(z) and the Macdonald polynomial Pκ (z). In this paper we give the nonsymmetric analogues for the cases r = 1 and r = n − 1. We do this by first deducing the the decomposition for the product of any nonsymmetric Macdonald polynomial Eη (z) with z...

We derive several limit results for the profile of random plane-oriented recursive trees. These include the limit distribution of the normalized profile, asymptotic bimodality of the variance, asymptotic approximation to the expected width and the correlation coefficients of two level sizes. Most of our proofs are based on a method of moments. We also discover an unexpected connection between t...

We consider the generating polynomial of the number of rooted trees on the set {1, 2, . . . , n} counted by the number of descending edges (a parent with a greater label than a child). This polynomial is an extension of the descent generating polynomial of the set of permutations of a totally ordered n-set, known as the Eulerian polynomial. We show how this extension shares some of the properti...

Blood pressure (BP) values and the phenomenon of tracking were evaluated in a group of 481 schoolchildren over a nine year period starting at age 6 years. BP values were obtained yearly by taking the mean of two measurements at one visit, measurements were taken by only two observers during the study. For both systolic and diastolic BP, correlation coefficients between year 9 and previous measu...

An oscillatory capillary rheometer was used to investigate the effects of NaCl, KCl, and CaCl2 on visco-elastic properties of xanthan and locust bean gum (LBG) blends in dilute solution. Gums were evaluated for intrinsic viscosity and elastic component. Molecular conformation of the xanthan–LBG complex was assessed by the power-law and Huggins equations. Addition of any of the three salts reduc...