<p>In recent years, the investors pay major attention to invest in gold market ecause of huge profits in the future. Gold is the only commodity which maintains ts value even in the economic and financial crisis. Also, the gold prices are closely elated with other commodities. The future gold price prediction becomes the warning ystem for the investors due to unforeseen risk in the market. Hence, an accurate gold rice forecasting is required to foresee the business trends. This paper concentrates on orecasting the future gold prices from four commodities like historical data’s of gold rices, silver prices, Crude oil prices, Standard and Poor’s 500 stock index (S&P500) ndex and foreign exchange rate. The period used for the study is from 1st January 000 to 31st April 2014. In this paper, a learning algorithm for single hidden layered eed forward neural networks called Extreme Learning Machine (ELM) is used which as good learning ability. Also, this study compares the five models namely Feed orward networks without feedback, Feed forward back propagation networks, Radial asis function, ELMAN networks and ELM learning model. The results prove that he ELM learning performs better than the other methods.</p>
Four new nitrogen‐oxygen, dibenzo macrocyclic ligands containing two amide groups have been prepared by combining a dibenzo‐containing diamidodialdehyde with an appropriate diamine followed by reduction of the intermediate bis Schiff‐base. The starting dibenzo‐containing diamidodialdehyde was prepared by treating 2 equivalents of salicylaldehyde with a bis(α‐chloroamide).
The effect of methyl substitution on 15- and 17-membered macrocycles
(incorporating N2O2- and
N3O2-donors, respectively) on
their interaction with cobalt(II), nickel(II), copper(II), zinc(II),
cadmium(II) and lead(II) has been investigated. The results are compared with
those obtained for the corresponding complexes of the unsubstituted (parent)
rings. Binding constants for the formation of the metal complexes have been
determined potentiometrically in 95% methanol (I
= 0·1; Et4NClO4). An
X-ray crystallographic study of [NiL(H2O)]
(ClO4)2 (where L is the dimethyl
derivative of a 17-membered,
N3O2-donor macrocycle) confirms
that the nickel ion is six-coordinate, with the complex cation exhibiting a
distorted octahedral geometry defined by all five donor atoms of the
O2N3-macrocycle (in its
meso form) and the oxygen of the water molecule. In this
structure the macrocyclic backbone incorporating the
N3-donor fragment is arranged facially. Molecular
mechanics modelling of this complex predicts that the observed facial
configuration will be favoured over an alternative facial arrangement or a
meridional one.
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