Table of contentالمحتويات         :

Hasan Nakkar

Eaman  AL-Khouja

Abstract

Let R  be a commutative ring with identity. Recall that the ring R has Noetherian spectrum if R satisfies the ascending chain condition for radical ideals.

We say that a multiplicative lattice L has Noetherian spectrum (has property (N)) if L satisfies the ascending chain condition for radical elements.

The purpose of this paper is to study properties equivalent to the property (N) in multiplicative lattices, and to define a multiplicative lattice L which has a locally Noetherian spectrum. We proved that L has a locally Noetherian spectrum need not have Noetherian spectrum. So, we characterized those lattices with locally Noetherian spectrum which have also Noetherian spectrum.

Mohannad J. S. Shahwan

 Abstract

Generating Functions for Generalized Hermite Polynomials (G.H.P.) are obtained by giving suitable interpretations to the index(n) with the help of Weisner’s(1955) group-theoretic method.

A few special cases of interest are also discussed which would yield to new and known results of the theory of special functions.

KeyWords: Generalized Hermite Polynomials (G.H.P), Hermite Polynomials (H.P.), Generating functions.

2000 AMS Subject Classification:33C45,33C80.

 

Y S Abdelrahman

Abstract

  The yields of the fission fragments produced from ¹⁹⁷Au(¹⁹F,f) and ²³²Th(¹⁸O,f) reactions have been measured from the intensity of γ-rays emitted by the secondary fission fragments. A comparison between the yields of the fission fragments of the two systems has been made. From this comparison it is shown that the width of the Gaussian distribution of the fission fragments produced by the ²³²Th(¹⁸O,f) reaction is bigger than that of the fission fragments produced by the ¹⁹⁷Au(¹⁹F,f) reaction. This is consistent with not observing the γ-rays of the associated fission fragments.

Mahmoud Ahmad Omari

Abstract

Direct networks are popular way of interconnecting large number of processing elements of today’s large commercial and research multicomputers. The design of such networks is very important because it has a large effect on the performance, cost, and the scalability of the system. In this research we propose a new direct interconnection network suitable for large-scale parallel systems called the Mesh-Hypercube (MH). The MH uses the hypercube topology and the mesh topology as its basic structure. The MH combines the positive features of both the hypercube and the mesh, while at the same time circumventing their disadvantages. Hypercube topology has small diameter, high connectivity, symmetry, simple routing, and fault-tolerance. Mesh topology has simple regular structure, constant node degree, easily implemented, and highly size scalable. A very attractive feature of the MH network is its ability to support a large number of processors while maintaining constant node degree. In addition, the MH exhibits small diameter, small average distance, high connectivity, and simple routing. Other positive features include incremental scalability and fault tolerance.

Issa M. Makhlouf

Abstract

The Late Triassic/Early Jurassic Abu Shaybah Formation at Gharyan in northern Libya consists of 96m thick succession of clastic and subordinate carbonate sediments that can be divided into two members; a lower tidal member and an upper fluvial member. The tidal member comprises sandstone, siltstone, claystone and dolomites, and is characterised by the presence of rhythmic bedding, flaser bedding, symmetrical ripple marks, desiccation cracks, burrows and fossils. These characteristics suggest that this member was deposited within a tidal environment. The fluvial member is characterised by an erosive base nonfossiliferous, fining-upward sequences, trough cross-bedded sandstone, overlain and laterally intertonguing with varicoloured siltstone and silty-shale. The dominance of unidirectional palaeocurrents and the silicified wood fragments indicate deposition in a fluviatile environment. The fluvial system drained basinwards into a shallow-marine setting of the Tethyan ocean existed to the north.

Hamzeh Al-Omari

Abstract

The adsorption isotherms for Cu²⁺ and Ni²⁺ onto Tripoli were investigated in this study. It is found that adsorption follows the Langmuir model for both ions. The free energy of adsorption (ΔG) of Cu²⁺ adsorption was found to be -19.74 (± 0.83) kJ/mole and that of Ni²⁺ was -21.47 (± 2.4) kJ/mole. The affinity of Tripoli towards both ions is found to be the same as these values of free energy of adsorption for both ions are statistically similar as predicted from the student’s t-test. The rate of adsorption of nickel ion is found to be higher than that of copper ion as shown from the concentration versus time plots for both ions. The maximum adsorption capacities for Cu²⁺and Ni²⁺  were found to be 4.5(±0.4)x10^-5 mol/g and 10.2(±0.5)x10^-5 mol/g, respectively. These two values are statistically different as found from the student’s t-test at 95% confidence level. The pH values for all solutions were in the range of 4 to 5.

Issam J. Sallomi

Azhar A.Abdul Rahman

Tamather H. Mahmood

Abstract

A number of new complexes were prepared by the reaction, in both neutral and basic media, of cobalt (II), nickel(II) salts with Schiff

base ligands. These ligands derived from the condensation of 2- furfuraldehyde with benzoyl hydrazine (FBH) and salicyloyl hydrazine 

(FSH₂).

The isolated complexes which have the general formula [M(FBH)Cl₂]₂, [M(FBH)X] X , [M(FB)X(H₂O)] ₂ , [M(FSH₂)X₂] and 

[M(FS)(H₂O)₂] (where M=Co²⁺ , Ni²⁺, Cu²⁺ and X = Cl or NO₃) have been characterized by elemental analysis, conductivity

measurement, infrared, electronic absorption spectra and magnetic moments. The study indicates 1:1 metal to ligand ratio, non

electrolytic nature, the presence of anionic bridges and an octahedral geometry for all the complexes. The stability constants and the

reation with hydrogen peroxide for some of these complexes were followed spectrophotometerically. Hydrogen peroxide is reacted

with the new complexes and found to proceed through a complex- radical formation (formation of superoxo species). Cobalt (III)

superoxompound, [Co(FS)(H₂O)O₂] was isolated in the solid state and identified by magnetic moment, infrared and electronic

absorption spectra.

Ghassan I. Bisharat

Abstract

The introduction of a heat pump (vapor recompression) into an existing distillation column is studied. This modification will produce approximately 25% reduction in consumed energy and about 42% optimization of the thermodynamic efficiency factor. This is a substantial improvement to the much energy consuming distillation process. It will be indicated that the use of modification methods such as intermediate reboilers and/or condensers and heat pumps (vapor recompression) produce among others [1] :  reduction in the consumed energy, optimized thermodynamic efficiency factor and reduced column volume. These modifications should be studied further, together with the economical aspects, to calculate the investment, the savings, the payback period and other important economic and technological impacts of such modifications.

Montasser Tahat

Salih Akour

Saad Habali

Jamal Nayfeh

Abstract

 In this research, a newly developed Defense Holes System (DHS) under biaxial loading in a finite plate with a row of circular holes is presented. A systematic study based on first order optimization method is undertaken by utilizing the finite element analysis (FEA) to determine the optimum shape, location and size of the auxiliary defense hole system. These parameters are examined in relation to plate dimensions for a number of plates with different central-hole-diameter to plate width ratios, and biaxial loading with different loading ratios ranging from pure shear to uniaxial-loaded plate. Maximum stress reductions from 7-23 % were demonstrated for biaxially-loaded plates. With such reduction in the maximum stress level the improvement in fatigue life of a structural part can be very significant. This significant reduction is made possible by introducing elliptical auxiliary holes close to the main holes in the areas of low stresses along the principal stress direction. The defense system that is introduced has many advantages other than stress reduction like crack arrest, and weight reduction. The FEA results were validated experimentally by applying an enhanced RGB-photoelasticity technique. The photoelasticity experimental results and the FEA results show good agreement.
 

 

Ramadan. J. Mustafa

Yassin. L. Nimir

Abstract

The fracture behaviour and in-plane shear properties of unidirectional continuous SiC and Carbon fibre- Al matrix composites subjected to mode II loading conditions (direct shear mode) has been studied. A unique pure shear fracture test is devised to evaluate the in-plane shearing mode toughness of such composites based on fracture tests of shear specimens with pre-cracked edge-crack configuration specimens. The little variation in mode II toughness values with different crack lengths for both reinforced and unreinforced matrix materials indicate the suitability of the devised mode II specimens and the shear fracture tests.

The results obtained for in-plane shear properties show that the shear strength of SiC-Al(1050) and Carbon-Al(356) composites mode , where low fibre-matrix interfacial strength exists, is slightly higher than that of SiC-Al(354) composite mode , which seems to have a profound effect on the shear properties. The mode II stress intensity factor, , is higher than the opening mode I fracture toughness of the reinforced and unreinforced composite materials, owing to the different fracture mechanisms involved.

Salim Salem  Al-Taleb·

Abstract

A study was conducted to investigate the effect of supplementing drinking water with different levels of vitamin AD3E alone or with vitamin C on the productive performance of broiler chicks.

A total number of 900 day old hatched broiler hybrid (Ross) chicks were allocated randomly to six dietary treatments in three replicates of 50 chicks/replicate. The treatments were: control, 1.25ml/L AD₃E, 1.25ml/L AD₃E + 15g vit. C, 2.5ml/L AD₃E+ 15g vit.C, 3.75ml/L AD₃E+15g C and  5ml/L AD₃E +15g vit. C/L.

The results indicated that the average body weight and feed conversion ratio of chicks supplemented with vitamins AD3E alone or with  vitamin C in the drinking water were significantly (P < 0.05) higher than that of the control group. Furthermore, supplementing broiler chicks with extra amounts of vitamins AD3E and vitamin C significantly (P <0.05) increased calcium (Ca) and phosphorus (P) blood levels compared with those of the control group.