ISSN: 1817-2695

Volume 33, Issue 2

Volume 33, Issue 2, Spring 2007, Page 1-111


Optical properties of Aluminum-Zinc oxide thin filmsPrepared by spray pyrolysis technique

G.M.Shebeeb

Journal of Basrah Researches (Sciences), Volume 33, Issue 2, Pages 1-6

Thin films of ZnO:Al about one µm were deposited on glass substrates using spray pyrolysis technique . The optimum spray conditions were
identified to
obtain good compatible between optical and film homogeneously properties. The optical parameters were calculated depending on transmission spectrum in the range (0.3-0.85) µm. The fundamental absorption in the band to band transition was also investigated and energy gap of 3.25 eV was recognized in term of the imaginary part of the dielectric constant.

Critical Points of Scattering Electrons by Light Atoms at Low Energies

A. H. Hussain; and; F. A. Ali

Journal of Basrah Researches (Sciences), Volume 33, Issue 2, Pages 7-21

The electron energy where aminimum in the differential cross section attains its smallest value is known as the critical energy , and the corresponding scattering angle is the, critical angle. The method which requires phaseshifts only at three energies is used for obtaining critical positions for the scattering of electrons by atoms .The method of partial waves along with an optical potential is employed .To explore the possibility of the existence of critical positions for the atoms , the differential cross sections for the elastic scattering of electrons from the light atoms having atomic number 4 to 10 are obtained in the 0-100 eV region .The values of the critical positions obtained by the proposed method are in excellent agreement with the computed values and other investigated values

Geometric Influence on the Electron Distribution in Gas Discharge Plasma

N.H.N. Al-Hashmiy

Journal of Basrah Researches (Sciences), Volume 33, Issue 2, Pages 22-30

An analytical model is proposing to investigate the influences of the shape and size of an open and closed cylinder on the electron density distribution. A two-dimensional steady state ionization equation solved analytically by using cylindrical coordinates. The only gain and loss processes consider are the cascade ionization and electron diffusion. The radial behaviour of the diffusion length in both open and closed cylinder for different values of shape and size are calculated and the axial and radial electron density distributions discusses for some values of gas velocity.

Wind Waves Hindcasting at the North West of the Arabian Gulf

Ali B. Mahmood

Journal of Basrah Researches (Sciences), Volume 33, Issue 2, Pages 31-42

Historically, wind waves data that covers the north west of the Arabian Gulf has been poor. The Demirbilek and Coworkers (1993) method is used to hindcast the significant wave height on a fully developed sea and period for the duration from1960 to1990 in the north west of the Arabian Gulf .The data of wind speed has been observed at 10 m over sea surface and gathered by Abadan station. Results show that the higher wave height , period ,friction velocity , drag coefficient and wind stress are in Summer (June-September) season in the duration from 1960 to1990 and the manner of increasing is in parallel with wind speed .The higher wind speed gives more energy transfer from the wind to the sea surface.

Prepared by Spray Pyrolysis Technique

Maarib A. Khalid; Iman K. Salim; and

Journal of Basrah Researches (Sciences), Volume 33, Issue 2, Pages 43-53

CuFeS2 thin films are prepared using the spray pyrolysis technique. The effect of substrate temperature (473-713 ˚K) on the optical and electrical properties of the thin films is investigated. Both optical spectra (Absorption and Reflectivity) show two electronic transitions: one is around 2.55eV and the other is around 3.65eV. The variation of the DC electrical resistivity of the thin films is discussed in relation with the optical results and structural configuration.

A Study of Recent Native Sulfur Deposits in South Eastern Basrah area -

Basim H. Soltan

Journal of Basrah Researches (Sciences), Volume 33, Issue 2, Pages 54-65

Nine rock samples were collected from yellow coloured fragments scattered in two neighbor sites in Abul-Khasib area. Field study and sampling were carried out during Feb./2005-Jan./2006. All samples were chemically analyzed by SEM technique. This analysis emphasizes that the sulfur content is 100%. The origin of this sulfur is not yet decided if it is native sulfur deposits originated from underground source ,which could related to the subsurface hydrocarbons seepage in the area or released biologically from underneath evaporatic rocks and dissolved in ground water which derived to the surface by capillary phenomenon, the sulfur which precipitated later by evaporation of salty water. This is a first study of this phenomenon, and it needs more detailed studies to predict a final real hypothesis.

Conduction mechanism of poly (P-Aminobenzaldehyde) terminated by phenylene diamine doped with

H. K. Ibrahim

Journal of Basrah Researches (Sciences), Volume 33, Issue 2, Pages 66-75

The electrical properties of poly (P-Aminobenzaldehyde) terminated by pheneylene diamine doped with Na2[Fe(CN)5.NO].2H2O films prepared by cast method have been investigated.
The (Current – Voltage) and (Conductivity – temperature) relationships are measured in the voltage and temperature ranges (5-120) V and (288 -348) K respectively.
The resistance of the doped films is found to have a negative thermal coefficient. The activation energy at temperature (288 -348)K about (0.175)eV is found from the ohmic region of the dark (current – voltage) characteristic. The conductivity at room temperature was equal to 2.5×10-14 (S.cm-1).
The deviation from ohm's law has been analysed in term of the available conduction theories. Hopping conduction mechanism was concluded to be the most probable as interpreting the behavior of charge transport that supplied by injector electrodes.

Third-order nonlinearities and optical limiting properties of rose Bengal at 532 nm wavelength

Q. M. A. Hassan

Journal of Basrah Researches (Sciences), Volume 33, Issue 2, Pages 76-82

The nonlinear refractive index n2 and nonlinear absorption coefficient  for aqueous solution of rose Bengal were obtained using closed aperture and open aperture Z-scan technique at the same wavelength. The nonlinear refractive index n2 shows negative nonlinearity of the sample and it is measured to be n2 = -5.6 x 10-8 cm2 /W. Moreover, a variation of nonlinear refractive index with intensity is observed. The nonlinear absorption coefficient is measured to be  = -8.3 x 10-3 cm/W. Also the optical limiting property of the sample has been investigated using frequency doubled Nd:YAG laser.

A study of the response of solid state nuclear track detectors LR115-Ι, LR115-П, CN85 and CR39 to alpha particles using track diameter measurement

H.Bakr

Journal of Basrah Researches (Sciences), Volume 33, Issue 2, Pages 83-90

The accuracy of track diameter for (LR115-Ι, LR115-П, CN85 and CR39) are measured in the present work. Comparison for the response curve is studied regarding the relation between the growth of the diameter (Vd ) and the energy of alpha particles for different detectors with the given processing parameters. As a conclusion: alpha particles with energy 4 MeV give the better results.CR39 track detector is more effected by the energy of alpha particles and the response to register the charge particles than the other detectors used.

The sedimentary model of Thi-Qar governorate during the holocene, south west Iraq.

Maher M. Mahdi Al-Asadi

Journal of Basrah Researches (Sciences), Volume 33, Issue 2, Pages 91-101

Nine boreholes that do not exceed 20m depth were studied in Thi-Qar Governorate to determinate the sedimentary model of this area, so the boreholes were studied from lithological point of view, four beds were identified from bottom to top 1. Dense silty sand bed could belong to the Hammar Formation 2. Medium silty clay silty sand bed 3. Stiff silty clay bed 4. Marly silty clay bed, as well as, the faunal assemblages was determinate one bore hole (B.H9). Depending on the Lithological and paleontological information, three stages of sea level fluctuation were characterized, there are: 1. The maximum of transgression, the shore line covered the region of south east of Mesopotamia but did not reach Shattra and Al-Gharraf cities towards the west 2. Simple regression of the shore line, reached to Nassiriya city borders (BH.5) 3. Rapid regression of the shore line, where the marine sand is disappeared throughout the study sections.