ISSN: 1817-2695

Volume 37, Issue 4

Volume 37, Issue 4, Summer 2011, Page 1-99

A Wavelet Packet Transform-Based Technique for the Discrimination of Inrush Currents from Faults in Three-Phase Transformer

Adel A. Obed; Majed A. Alwan and Waad N. Taboor

Journal of Basrah Researches (Sciences), Volume 37, Issue 4, Pages 1-14

The inrush current occurs primarily when a transformer is energized. The magnitude of inrush current may be as high as ten times of transformer rated current which causes malfunction of differential protection system. Therefore, it is necessary to discriminate inrush current from faults. In this paper, a new approach of discrimination between inrush current and internal fault currents is proposed based on wavelet packet transform (WPT). The selection of optimal mother wavelet and the optimal number of level of resolution is carried out using the minimum description length (MDL) criteria. The proposed approach is tested for signal tripping using data collected from a simulink model of power three phase transformer for different cases that included inrush, internal fault currents and external fault currents. The simulated results clearly show that the proposed approach facilitates the accurate discrimination between inrush and fault currents in differential transformer protection.



Journal of Basrah Researches (Sciences), Volume 37, Issue 4, Pages 15-24

Theoretical analysis is given here showing the existence of a linear relation-ship between the mean velocity in a pipe and the mean frequency in the spectrum of the noise signal caused by the passage of electrostatic charges carried by the flow as picked up by a suitable system of electrodes.

The analogue electronic circuit required to obtain is built and tested in a flow circuit employing air. The experimental results confirmed the linear relationship expected theoretically and the error in the reading is about ±2%.

Electrical conductivity dosimetric characteristics of gamma-irradiated food salt

Riyadh.Ch. Abul-Hail

Journal of Basrah Researches (Sciences), Volume 37, Issue 4, Pages 25-29

The electric conductivity characteristics of sodium chloride solution , have been studied in the present work considering its usage as a high dose dosimeter “accidental dosimeter” in the case of a nuclear fallout . Aqueous solution of gamma-irradiated food salt was investigated for dosimetric purpose using the electrical conductivity method. It was found that the solution containing [10-100]%(w/w) of food salt the most sensitive to radiation .
The variation of electrical conductivity of all the solution was found to increase linearly with absorbed dose in the range (3-120) kGy. Reproducibility ,radiation dose response ,dose rate, and stability can have been studied.The results of this preliminary study show that food salt solution may be applied to a simple electrical conductivity detector for dose measurement in the dose range (3 – 120)kGy .

Bifurcation analysis for CO2 laser

May J. Ashoor

Journal of Basrah Researches (Sciences), Volume 37, Issue 4, Pages 30-37

The bifurcation behaviors for CO2 laser is studied using four level system model, by solving the differential equations describing that model. The bifurcation diagram gave very clear idea about dynamic behaviors. This system, it has been drawn as a function of modulation amplitude parameter A. From all this, we obtained a scenario of the diagrams by increasing frequency of modulation signal parameter ( ) within (A- ) plane. Many of different dynamic behaviors such as period doubling and chaos are observed.

Study of temperature- dependent modulated VCSEL dynamics

H. A. Sultan

Journal of Basrah Researches (Sciences), Volume 37, Issue 4, Pages 38-43

In this work the nonlinear dynamics of Vertical Cavity Surface Emitting Laser (VCSEL) is studied. The rate equations describing VCSEL dynamics are solved numerically. The simulation shows that the directly modulated VCSEL output power and its modulation response are sensitive to the injection current, the modulation signal amplitude and frequency. The study proves that VCSEL dynamics is strongly affected by the variation of temperature.

Microcavity Length Role On The Characteristic Temperature And The Properties Of Quantum Dot Laser

ed M. Hassan

Journal of Basrah Researches (Sciences), Volume 37, Issue 4, Pages 44-55

Quantum-dot laser devices contains microcavity length which initially populates the properties of quantum dot lasers (QDLs). We studied the influence upon the optical confinement layer free carriers density, confined carrier level occupancies in QDs, threshold current density, internal loss coefficient, characteristic temperature, the maximum operating temperature and QD lowest excitation energy. Our results have been calculated as functions of limit structure parameters of GaInAsP/InP QDL with wavelength of 1.55 μm. The QDL characteristic temperature was studied with the effective cross section and sets an upper limit certain temperature for operating temperature of a QD laser.

A Comparative Study: The Effect of Pulsed and Static Magnetic Field on The Healing of Rupture of Achilles Tendon in Rabbits

Journal of Basrah Researches (Sciences), Volume 37, Issue 4, Pages 56-65

The pulsed and static magnetic field were used in treatment of tenectomy achilles tendon, which no significant results at level of P≥ 0.05 in both groups. Eighteen rabbits were used in present study, the animals were divided into three equal groups , 1st group was treated with pulsed magnetic field (650 Gauss,50 Hz), 2nd group was treated with static magnetic field (650 Gauss), while 3rd group was used as a control group. The magnetic therapy was continued to four weeks post surgery/ twice daily. Clinical signs were recorded to all groups, loading force and jumbling power tests which used in athletics to knowledge achilles tendon sufficiency post surgery. The magnetic treated groups were showed significant result with control group at P≥ 0.05, while no significant results at P≥ 0.05 between pulsed and static groups. Blood parameters were examined, there significant result at between magnetic groups and control group at P≥ 0.05 during the 1st-four weeks (treatment period), while return to unsignificant at seven weeks post surgery at P≥ 0.05. The gross and histopathological picture were taken at seven post surgery, semi complete healing in magnetic groups, while control group was showed more collagen and fibroblast. In conclusions of this study, the magnetic field therapy have ability to acceleration healing the rupture tendon increase blood parameters. Theorically, the mechanism of action magnetic field to accelerate healing was discussed.

Heritabilties and Breeding Values of Production and Reproduction Traits of Holstein Cattle In Iraq

Adnan J. Jadoa; Asaad Y. Ayied; Ali J. Abdulrada

Journal of Basrah Researches (Sciences), Volume 37, Issue 4, Pages 66-70

A total of 4714 records collected from 733 cows progeny of 13 sires through the period from 1989 to 2000 in Al-Nassr Dairy Cattle Station were used to estimate the heritability and breeding values of sires for total milk yield, days in milk, calving interval, dry period and age at first calving. Individual animal models were fitted to the total milk yield from all lactations to estimate breeding values by Restricted Maximum Likelihood methodology. Heritability was estimated by using different methodology. Their values for milk yield, days in milk and dry period, calving interval and age at first calving were (0.05-0.21), (0.02-0.09), (0.32-1.00), (0.00-0.23) and (0.36-0.43) respectively. The estimated breeding values for milk yield ranged from –394.00 to 475.00 kg. Estimates of the positive breeding value (BV, %) was 48.56 %. Breeding values of days in milk ranged from -5.44 to 6.30 days and 45.48% respectively. However, sires showed lower (23%) positive breeding value for both dry period and calving interval and age at first calving (30%). Their breeding values ranged from -15.95 to 49.60 days for dry period, -8.14 to 11.91days for calving interval and -2.10 to 2.28 months for age at first calving.

The effect of Sodium chloride and Cephalexin antibiotic on the growth of Leishmania tropica and Leishmania donovani

Hind Mahdi Jarallah

Journal of Basrah Researches (Sciences), Volume 37, Issue 4, Pages 71-77

To examine the tested drugs (sodium chloride and Cephalexin), we tested the drugs in vitro against promastigote stage of parasite with multi concentrations of the drugs. The viability of the parasite was counted daily to promastigote for 5 days. Hypertonic sodium chloride solution LD50 value against Leishmania donovani and Leishmania tropica promastigote was (0.021) and (0.04) mg/ml respectively, while Cephalexin LD50 value against L. donovani and L. tropica promastigote was (1.4) and (2.55) mg/ml respectively. Hypertonic sodium chloride solution and Cephalexin a wide-spectrum antibiotic have effective leishmaniacidal agents against L. tropica and L. donovani promastigote in vitro.

Antimicrobial effect of bee honey on some pathogenic bacteria isolated from infected wounds in comparison to commonly used antibiotics

t Abdul Hassan M.Jawad; Rafa

Journal of Basrah Researches (Sciences), Volume 37, Issue 4, Pages 78-83

Honey produced by the honey bees is one of the ancient traditional medicines used for treatment and prevention of various illnesses .In this study the antimicrobial effect of bee honey on organisms isolated from infected wounds in comparison with commonly used antibiotics for the treatment of infection was evaluated . (50) swabs from patients with infected wounds were cultured. The most frequently isolated organism was Psedomonas aeruginosa representing (44%) of the isolates followed by coagulase – positive Staphylococci (30%) . The susceptibility of the isolated organisms to honey , antibiotics and combination of both was studied .The mean inhibition zone produced by honey when applied to isolated gram–negative bacteria (Psedomonas aeruginosa) and isolated gram–positive bacteria (coagulase positive Staphylococci ) was significantly higher than that of the antibiotic used (P<0.005), and when combination of both honey and antibiotic was used , it showed highly significant increased sensitivity than that of honey or antibiotic alone (P<0.001).

Effects of halothane anesthesia on patients with abnormal liver function tests

Wafaa A.N.Fleifel

Journal of Basrah Researches (Sciences), Volume 37, Issue 4, Pages 84-92

This study done randomly in Basrah General Hospital during the period between March to December 2006, Forty five patients (age range 6 -75 years), (21) 46.8% males and 24 (53.2%) females, for evaluating of the safety and laboratory data for halothane anesthesia, all of them presented with mild abnormal liver functions during routine investigations to elective surgeries under general anesthesia (the common use of halothane known to cause hepatotoxicity). Five milliliters from venous blood were taken before the operation then immediately after the operation, and on the first and third day postoperatively. Blood was tested for serum transaminases, alkaline phosphatase and total bilirubin, using appropriate kits. Twenty two (48.89%) had repeated exposure to halothane by underwent previous surgeries, and 23 (51.11%) are newly exposed to halothane. No significance change had been observed in relation to the gender of the patients for all parameters. None of the patients showed severe changes in each type of the parameters when analyzed individually (more than 3 times their upper normal limits). We conclude that laboratory values immediately after surgical operations and for 3 days later have no trend for a major derangement in the patients with abnormal liver functions.

Theoretical molecular structure determination infrared frequencies with solvent effect of some α-diketones

Naji A.Abood; Bahjat A.Saeed and Sadiq M. Hasan Ismael

Journal of Basrah Researches (Sciences), Volume 37, Issue 4, Pages 93-99

Molecular structure determination for six α-dicarbonyl compounds as well as their vibrational frequencies have been theoretically investigated by molecular orbital by ab initio calculation based on DFT theory level using 3-21G basis set performed by B3PW91 method. Assignments for vibrational frequencies were made, and solvent effect on the IR frequencies in the carbonyl region was studied using four solvents; carbontetrachloride, chloroform, methanol and tetrahydrofuran.
α-dicarbonyl compounds exist in trans conformation with planar structure. Replacement of H atoms in glyoxal by CH3 or phenyl groups has no effect on the planarity of the molecules. Carbon-carbon bond length of dicarbonyl moiety is shorter in dibenzoylmethane compared with glyoxal, whereas C=O bond shows opposite behavior.
The molecules have two frequencies in the carbonyl region that arise from coupling between the two carbonyl groups in the symmetrical molecules, assigned to two internal normal vibrational modes.