Ibn Al-Haitham Journal For Pure and Applied Sciences

The conductance of solu ti ons of cysteine in water at different concentrations and temperatures has been measured. These solutions obey Onsagcr equation and give linear relations especially at low concentrations. In more concentrated solutions a deviation from the equation is observed.

The molar conductivity of these solutions decreases with t he increase in concen trations at constant temperature.

The values of the ionization constants and the conductivity at infin ite

dilution for each temperature have been calcu lated

Protein bound fucose (PBF), protein bound hexose (PBHex), and total calcium {T.Ca) were 'determined in sera of (40) hy-p.ertnyroidism , (40) hypothyroidism patients and (40) controL The resultsr vealed a significant decrease in the kwel of PBF, PBHex and T.Ca in sera of patients with .hyperthyroidism compared to control; Inc se Qf PBF. there nQ difference in its level betwe.en patients with hypothyroidism and control group. While there is a significant increment in PBHex leveli:n both hyper and hypothyroidism With respect to that of control Result indicates, that total calcium levels were i.n the nomml range for all p tients groups. Patient compared to control no difference in the level of (PBF) b tween hypoth.yroid1sm and controL A significant

increa;;.e in the level of PBHex in sera of hyper and hypothy:roidJsm

compared to controlwas found.

A new complex of Cr(UI) has been prepared. The kinetics and eqailibrium study of the substitution reaction for the complex Trans­ KfCr(ox)z(H 0)2].3l--h0 {T I }, with 4-aminoantipyrine {AAP}, bave been per£Qrm d in aqueous media at .(pH. = 4.9, 5.6 and 6.0) (!!?0.4M NaN03). Activation pararrieters for the reac(ions are {Eat= l.89l kCal

mor 1 , l:t=89.29 kCal mo1"1 and t\S 1 = 0.281 Cal. mor1) and
1
(Ea2=0.487kCal mort, .1\Ht!=6..2.Cl3 kCal mort and t1S 2 = -92.8 Cal mor
). The observed rate constants are in good agreement with substitution
rea<;;tion of the C<,)mplex with amino acids( J) and other anions(2).

Hydrogen productions were achieved by irradiating ethanol ic aqueous solutions (20%. v/v) containing mixtures of the ligand 2,4- dimethoxybcnzylidene-2-hydroxy aniline (HL) or one of i ts complexes (ML2) wi th the following divalent ions: fVbl (II), Fc(IT), Co(II). Ni( rt ), Cu(H) and Zn (11), as photosensi1izers, methyl viol ogen (MY.:-) as electron acceptor. ethylene diamine tetraacctic acid disodium saJt (EDTA) as a sacrificial electron donor. in presence of platinum poly (viny l akohol) (Pt-PVA) or platinized li02 (Pt/Ti02). (200 and 45 micron) as reduction catal ysts. using white light from 250

W xenon a rc lamp at room temperature 25±2 °C. Oxidation Potentials

of the ligand and its complexes were determined by cyclic vultammetry. The efficiency of the photoreduction of lv1V2+ and hydrogen production .by HL and metal .complexe.s was main l y dependant on pH , type- and particle size of cata lyst, as well as meLal ion in case of ML2. Best pertormances were recorded by the free

ligand.

The study of torsion {torsion free) fuzzy modules over fuzzy
integtal domain as a generalization oftorsion (torsion free) modules.

I n this paper ,we 'viii consider the density questions associC;lted with the single hidden layer feed forward model. We proved that a FFNN with one hidden layer can uniformly approximate any continuous function in C(k)(where k is a compact set in R11 ) to any required accuracy.



However, if the set of basis function is dense then the ANN's can has al most one hidden layer. But if the set of basis function non-dense, then we need more hidden layers. Also, we have shown that there exist localized functions and that there is no theoretical lower bound on the degree of a pproximation common to all acti vation functions(contrary to the si tuation in the single hidden layer model).