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The effect of two substituents on different organoselenides and tellurides to form new charge-transfer complexes
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Qatar University
, 2004 , Article)
Different organotellurides and selenides were prepared as electron donors and reacted with p-Benzoquinone (p-BQ) and m-Dinitrobenzene (m-DNB) as electron acceptors .
The resulted molecules were considered as new ...
Lumping Processes of Periodic ARMA Processes
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Qatar University
, 2004 , Article)
In this article various lumping processes are defined for periodic ARMA (PARMA) processes, namely, the forward, the backward and the cyclic lumping processes. The inter-relations between the parameters of these lumping ...
Preparation, Characterization and Structural Determination of some coordination compounds of quadridentae thiosemicarbazone
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Qatar University
, 2004 , Article)
New transtion metal complexes of Co", Ni" and Cu" with benzil bis 4-(p-Chlorophenyl-thiosemicarbazone) and benzil bis 4-(p-Bromophenyl-thiosemicarbazone) were synthesized. Attempts were made to ascertain their probable ...
Strain Broadening of E.P.R. Linewidths in Fe/Mgo Single Crystals and Powders
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Qatar University
, 2004 , Article)
The E.P.R. linewidth of the M= + 1/2 <-» -1/2 transition of Fe3+ spectrum of Fe/MgO single crystals and powders have been measured at 9 GHz before and after annealing. The nominal iron concentrations ranged from 310 to ...
Application of Stripping Voltammetry for the Determination of Cadmium, Lead, Copper and Zinc in Yemani soils and Vegetables
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Qatar University
, 2004 , Article)
Heavy metals contents in the solutions from acid digestion of Yemeni soils and vegetables were deter¬mined by differential pulsed anodic stripping voltammetry. The geometric mean for Cd, Pb, Cu and Zn concentrations for ...
On the Classical Multicolor Ramsey Number R(3,3,3)
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Qatar University
, 2004 , Article)
In this paper, we are interested in the problem of evaluation of the classical multicolor Ramsey number i?(3,3,3). We first convert it successfully into a system of clauses of 3-literals each, i.e., a 3-SAT instance. We ...
Some Inferential Problems in Finite Population Sampling
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Qatar University
, 2004 , Article)
We review some results in problems of estimating a finite population total (mean) through a sample sur¬vey. Section 2 considers inference under a fixed population model and Section 3 addresses the same prob¬lem when the ...
Performance Analysis of a Fileserver in an ATM Network
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Qatar University
, 2004 , Article)
ATM continues to gain acceptance as a unifying communications technology for traffic of both digital and analog origins. The main characteristic of an ATM network is its discrete time (slotted) operation and fixed-length ...
Z1, center orientations and adsorption of atomic halogens at the (001) surfaces of Alkaili Chloride Crystals: DFT Calculations.
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Qatar University
, 2004 , Article)
An attempt has been made to examine the relative stabilities of Z, center orientations at the surfaces of
Be2+, Mg2+ and Ca2+ doped LiCl, NaCl and KC1 ionic crystals as well as the effects of Z, center on the
adsorption ...
Strong and Weak n-Homogeneous Spaces
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Qatar University
, 2004 , Article)
In this paper we introduce new types of n-homogeneity, we call them n-homogeneous of type 2 and type 3, denoted by nH2, nH3 respectively. We show that every 3H3-space is bihomogeneous space. Also, every finite nH3-space ...