Table of contentالمحتويات         :

K. A. Mohammed
Department of Physics, College of Education, Mosul University,
Mosul, IRAQ.
Abstract

The thermoelectric effects (Seebeck effect) have been investigated for the transition metal monoxides Cu_xTM_1-xO polycrystalline alloys, which have been prepared from mixing the appropriate quantities of CuO and NiO, MnO, CoO or CdO  for the atomic weight percentage ratios 0, 25, 50, 75 and 100 in the temperature range 300 K to 500 K using the solid state reaction method. These results show that the thermoelectric power effects increase (in general) as temperature rises. Results of the magnetic susceptibility at room temperature have also been investigated.

Keywords : Seebeck Effect, Thermoelectric Power, Transition Metal Monoxides Alloys.

Dheya P. Yousif       Hameed Ch. Ali     Ra’ad  H. Bakir
*    Department of Plant Breeding and Genetics, Agricultural and Biological Research Center, P.O. Box 765, Baghdad, Iraq.
** Department of Field Crops Sciences, College of Agriculture, University of Baghdad,
Abstract

This study was conducted at Al-Tuwaitha Experimental Station (33º 06' N, 44º 34' E, 24 masl),  the Agricultural and Biological Research Center in fall 1994 and 1995. A diallel cross program was conducted for ten local maize inbred lines according to the fixed model, method 2 of Griffing. The objective of this study was to estimate the genetic variance components, the degree of dominance, and heritability.

A significant genetic variance within the population that facilitates selection for several agronomic traits was investigated. Values of dominant genetic variance exceeded additive genetic variance for all traits under investigation that reflected the overdominance and / or the epistatic effect due to the value above than one of the degree of dominance. Broad sense heritabilities were increased, whereas they decreased for narrow sense heritabilities for all traits except teaseling and silking date in 1994 and ears per plant and weight of 300 kernels in 1995. Results may emphasize the additive gene action due to cumulative effect for these traits and it may make selection for the next generations more easy and efficient.

 

Mahmud Masri
Department of Mathematics, An-Najah National University
Nablus, P.O.Box 7, Palestine

Abstract

Let be the open unit disk in the complex plane C,  be the space of all analytic functions in , and  be a modulus function such that is subharmonic on  for all . The Hardy-Orlicz space  is the space of all such that  has a harmonic majorant on and  is the space of all such that  has a quasi-bounded harmonic majorant on . In this paper we assume that  is a strictly increasing unbounded modulus function.We study mean growth and Taylor coefficients of functions in  and bounded subsets of it. This will be a generalization of special cases such as where ,  where    , , where   , , and  where   . Also,we define a Frechet space  containing  which generalizes the  special case  .
 

Mohammed Matouq
Al-Balqa Applied Univeristy, Ma’an College, Jordan

Abstract

This paper aims to investigate motivation for ISO 14001-based environmental management system (EMS) implementation, difficulties encountered, and effects of implementation on priority concerns and environmental performance of the certified firms in Thailand. To achieve these objectives a questionnaire survey study was conducted among the certified firms. Respondent’s results have shown that there is a significant influence on enhancing environmental performance of certified firms. More attention was given to manage natural resources consumption such as energy, paper and water. In addition, certified firms reported that better partnership has been built between local authority and community upon adopting the system. However, firms still look for more governmental support such as tax exemption and more reliable information resources.

Tayel El-Hasan
Department of Chemistry, Mu’tah University, Al-Karak – Jordan.

Abstract

A geochemical survey of soils in the rapidly developing province at the city of Sahab, central Jordan, has been carried out to investigate the heavy metal abundances and distribution in the city soils. Fifty-six soil samples from 0-10 cm and 10-20 cm depths were collected on a grid basis of 500m X 500m and were analyzed for heavy metals using the sequential extraction with de-ionized water and 0.01M HNO₃ respectively. The main anthropogenic sources for the most additional quantities of the heavy metals were found to be in decreasing order of influence as follows: industrial, traffic, and residential activities. King Abdullah the Second Bin Al-Hussein Industrial Estate (KAIE) was not confirmed as a potential source of pollution due to the short time of influence and the northwesterly prevailing winds. All of the heavy metals are concentrated on surface soil, and decreased in the lower part, which reflects their low mobility due to soil nature and its high pH values. Although some heavy metal concentrations such as Pb, Zn, Cd, Fe, Cu, and Ni are high in some locations, but they do not represent serious pollution. However, it indicates the effect of rapidly growing rates of human related activities on changing the chemistry of the environment in the study area.

Khalid Tarawneh¹, Khalil M. Ibrahim² and Ibrahim Rabba’^{1
1 Geological Mapping Division, Natural Resources Authority, B. O Box 7, Amman 1118, Jordan
2 Department of Earth and Environmental Sciences, Hashemite University, P.O Box 150459, Zerqa}
Abstract

Chemical analyses, K-Ar dating and petrographic investigations were carried out on eight representative samples from the NW-SE basaltic dikes of the Harrat Ash Shaam Basaltic Super-Group (HAB) in northeast Jordan. In this study three phases related to the dikes were determined; the oldest took place around 23 Ma, the intermediate (12-8 Ma) and the youngest (3-1.5 Ma). The oldest dike system has the same age of the Red Sea (early Miocene). The basalt erupted along the dikes confirms the presence of tentional forces trending NE-SW. Every type of these dikes is related to and connected with representative and limited volcanic phase. Petrographically, five types of basaltic dikes can be distinguished; pyroxene-iddingsite basalt, olivine-iddingsite basalt; olivine basalt, pyroxene olivine basalt and iddingsite basalt. Samples range in composition from basanite to alkali basalt.

Keywords: Geochemistry, Geochronology, dike, Alkali basalt, basanite.

 

Sameer Ahmad Masoud
Faculty of Agriculture, Mu’tah University,  Jordan
Abstract

Three pairs of polymerase chain reaction (PCR) primers were compared to amplify the characteristic DNA fingerprints of Verticillium dahliae Kleb, (the causal agent of olive vascular wilt disease).  The primers include several combinations of the internal transcribed spacer (ITS) regions of nuclear ribosomal RNA (rRNA) genes and one pair from repetitive nuclear DNA sequences. Deoxyoligonucleotide primers specific to V. dahliae were synthesized based on the identified variable nucleotide sequences of the nuclear ITS regions of different Verticillium species that cause vascular wilt diseases. The PCR primers of nuclear repetitive DNA showed variable band intensities for the different isolates of V. dahliae isolated from olive trees in Jordan.  This suggests genetic variabilities of the local isolates collected from olive.  Primers based on the ITS sequences produced more consistently homogeneous and characteristic fingerprints. The detection limit of these ITS primers was further improved using nested PCR and to show the high specificity of the ITS primers. No nested PCR amplification was produced using the DNA isolated from different fungi in the same taxonomic class or other classes. These ITS-specific primer pairs may be useful in developing diagnostic procedures of Verticillium wilt disease using single or nested PCR.

Qasem M. Jaradat
Chemistry Department, Mu'tah University, Al-Karak, Jordan
Abstract

Different types of street dust: major streets, minor streets, gas stations, traffic lights, and car parks in Amman were subjected to size-fractionation into three sizes: 500-125µm, 125-53µm, and <53µm. Sequential extraction was also performed on the non-fractionated samples using Tessier procedure. The sequentially extracted and the fractionated samples were analyzed for Pb, Cd, Cu, Zn, and Mn using flame atomic absorption. The silt fraction (<53µm particles) contains the highest concentrations of all elements in most types of street dust samples followed by the fine fraction (125-53µm particles). From the sequential extraction data, the highest concentrations of heavy metals were : Pb, Cd, Zn, and Mn in Fe-Mn oxide fraction, and Cu in the organic fraction.

Keywords: Sequential extraction, Fractionation, Street dust, Heavy metals.

M. Al-Ajlouni, and A. Al-Hamdan
Mechanical Engineering Department, Engineering Faculty, Mu’tah University
Mu’tah, Jordan
Abstract
In this work, an ejector system for a typical cooling capacity of 1 kW, that corresponds to a coefficient of performance (COP) of 0.4 using R123 as a working fluid, was designed. The design procedure was carried out for optimum ratios of condenser to evaporator pressure, and evaporator to generator stagnation temperature. Preliminary tests of the fabricated ejector were carried out using air as a working fluid and implementing different pressure ratios and mass flow rates for the purpose of optimising the ejector characteristics regarding thermodynamic, heat transfer, and gas-dynamic parameters. Parallel tests for the heat potential of the engine exhaust were conducted. Encouraging results were obtained and the technicality of matching the proposed model with the real vehicle is explored.

A. A. Abdul-Razzak
Civil Engineering Department,  Mosul University, Mosul, IRAQ

Abstract

The finite element method is used for the nonlinear analysis of reinforced concrete slabs. Nine-node Lagrangian degenerate elements, which are the general shear deformable elements, have been employed. An assumed transverse shear strain is used in the formulation to overcome the shear locking. A layered approach is adopted to discretize the concrete through the thickness.

Both an elastic perfectly plastic and strain hardening plasticity approach have been employed to model the compressive behaviour of the concrete. The yield condition is formulated in terms of the first two stress invariants. The motion of the subsequent loading surfaces is controlled by the hardening rule, which is extrapolated from the uniaxial stress-strain relationship defined by a parabolic function. Concrete crushing is a strain-controlled phenomenon, which is monitored by a fracture surface similar to the yield surface. Steel reinforcement is smeared through the concrete layers and assumed to have similar tensile and compressive stress-strain relationships.

Geometrical nonlinearity in the layered approach is considered in the mathematical model, which is based on the total Lagrangian approach taking into account Von Karman assumptions.

Key Words

Compression, Cracking, Geometric Nonlinear Analysis, Material Nonlinear Analysis, Reinforced Concrete Slabs, Stress-Strain Relationship, Tension Stiffening.