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Article
Design, Construction and Operation of a Multi-Stage Large-Bore CO2 Laser

Authors: D.N. Raouf --- N.A. Al-Rubaiey --- S.I. Abdul-Latif
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2005 Volume: 1 Issue: 1 Pages: 25-29
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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Abstract

In this work, a CO2 laser system of five discharge stages was designed, constructed and operated with longitudinal electrical discharge and axial gas flow. The system was characterized throughout measuring output laser power as function of output coupler reflectivity, length of discharge tube and cooling water temperature. The maximum output power delivered was 135W at the TEM10 mode.


Article
The prevalence of trichomonas vaginalis in association with other micro-organisms among women with vaginal discharge in Mosul

Authors: Ghada A. Al-Daheen غادة الدهين --- Nawfal Y. Al-Dabbagh نوفل ياسين الدباغ --- Haytham M. Al-Habib هيثم محمد الحبيب
Journal: Annals of the College of Medicine Mosul مجلة طب الموصل ISSN: 00271446 23096217 Year: 2005 Volume: 31 Issue: 1 Pages: 37-44
Publisher: Mosul University جامعة الموصل

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Abstract

objective: To screen women with vaginal discharge for Trichomonas vaginalis as well as other pathogens and to follow them up.Setting: outpatient Gynaecologic Clinic, Family Planning Clinic, and Antenatal Clinic at Al- Batool Teaching Hospital for Gynaecology and Obstetrics. Participants: a 440 women with vaginal discharge (July 1997 to June 1999).Intervention: Full medical, gynaecological, sexual and social history was recorded. Clinical examination was carried out. Laboratory investigations including vaginal, cervical and urethral swabs for direct examination, gram-stained smear, as well as culture on appropriate media.Results: The total number of Trichomonas vaginalis infection was 68 (15.5%). The isolated microorganisms in association with Trichomonas vaginalis were candida albicans in 19 women (27.9%), Staphylococcus epidermidis in 10 women ( 14.7%), and Lactobacilli in six women constituting (8.8 %) . Both Diphtheroids and Neisseria ganorrheae showed lower incidences, as only eight women were positive (5.9 %) for each. Escherichia. Coli was present in one patient (1.5%).24 patients were positive for Trichomonas vaginalis only (35.3 %).The remaining 372 women who were negative Trichomohas vaginalis showed a high rate of infection with Candida species (21.5%),followed by Staphylococcus epictermidis(18.3%) and lactobacilli (15.3%).other isolates included Streptococcus species (8.6%)., E.coli (5.9%), Klebsiella ( 3.8%) ,Enterococcus fecalis (3.0%), Gardnerella vaginalis (2.6%), Neissenria gonorrheae (2.4%), Proteus (2.2), Diphtheroid (1.9%), staphylococcrus aureus(1.3%) and Pseudomonas aeruginosa (0.8%). Moreover, 46 (10.5%) of women showed no growth. 50.0% of infection with Trichomonas vaginalis was at age 26-35 years Considering marital status, the highest rate (76.4 %) of infection was among married women followed by divorced (14.7 %), widows (5.8 %) and singles ( 2.9%). Pregnant women positive for Trichomonas vaginalis represented (45 .6 %) of cases. 61.7% of infection was among illiterate women.Metronidazole (flagyl) was given to all in a dose of 250mg orally thrice daily for seven days.Metronidazole was prescribed at the same time to husbands of infected women. other specific medications (antifungal, antimicrobial agents) were given when indicated either alone or in combination with metronidazole.Two weeks later only 112 women came for reassessment clinically and by repeating direct smear and culture, that showed fifteen positive cases. Five of them still having Trichomonas vaginalis, eight were having Candida albicans, and two showed normal smears. Further courses of treatment were given as indicated.conclusion: Vaginal discharge is common among women in reproductive life.Culture is indicated for precise diagnosisKey words: Trichomonas vaginalis. Vaginal discharge, Metronidazole.


Article
Monte Carlo Simulation of Electronic Kinetics in Gas Discharge

Authors: A.B. Kadhem --- B.H. Hamad
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2005 Volume: 1 Issue: 3 Pages: 3-5
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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Abstract

The phenomenon of electrical gas discharge is present in manyapplications of plasma physics. Calculation of electrons motion tracingin gases are described. The backscattering probability of electrons tothe cathode has been estimated for values of E/P0 ratio from 10 to 200V.cm-1.torr-1 and for emission energies up to the lowest excitationpotential. The primary ionization coefficients and drift velocities wereevaluated for values of E/P0 ratio from 20 to 400 V.cm-1.torr-1. Theequilibrium of swarm with the field was considered in detail. It isshown that for uniform fields, deviations from exponential growth ofcurrent with increasing electrode separation occur if the interelectrodevoltage is not at least three times the mean energy ofelectrons impinging on the anode.


Article
Flow Calculations for a Two-Dimensional Irrigation Nozzle

Authors: Munther A. Mussa --- Hussain H. Ahmad --- Hussain Y. Mahmood
Journal: Journal of Engineering مجلة الهندسة ISSN: 17264073 25203339 Year: 2005 Volume: 11 Issue: 4 Pages: 759-773
Publisher: Baghdad University جامعة بغداد

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Abstract

The most efficient nozzle is generally considered to be that for which the discharge coefficient is nearly unity. Nozzle dimensions influence the discharge coefficient. In sprinkler irrigation systems there are many types of nozzles because any sprinkler irrigation system has special one depend on these system characteristics, so the discharge coefficient relation with nozzle dimensions must be known to the sprinkler irrigation system designer. A computer program for nozzle flow characteristic was built and the relation between the discharge coefficient (Cd) and the nozzle geometrical dimensions to reach to the best nozzle design was studied. The finite difference approach was introduced to carryout all computations with special grid arrangement. The steady state Navier-Stocks equations complemented with (k - ε) turbulence models were solved. These work calculations were for nozzle of convergent part with some angle (3.7° -7.7°) followed by straight part (tip part). Three values were taken for the convergent part length; three for tip part length and the nozzle diameter changed for three values also. The Reynolds number range was 1.95 x 10^5 < Re < 3.9 x 10^5 and Fortran 95 computer program language was used. The results gave good imaging to the relation between nozzle dimensions and the discharge coefficient, where the major result was increasing the tip length is allowing the boundary layer to growth and hence increasing its thickness and so discharge coefficient decreasing. Comparison of the results with ANSYS package shows that the present numerical method was accurate enough and might be used to predict the discharge coefficient for the sprinkler irrigation system nozzle.

النفاث الأحسن كفاءة يعتبر عمومأ الذي له معامل تدفق الأقرب إلى الوحدة الواحدة. معامل التدفق يتأثي بأبعاد النفاث، في منظومات الري بالرش يوجد أنواع متعددة من النفاثات ذلك لان كل منظومة ري بالرش لها نفاث خاص بها يعتمد على مواصفات هذه المنظومة، لذلك علاقة معامل التدفق بأبعاد النفاث يجب أن تكون معروفة لمصمم منظومات الري بالرش. تم بناء برنامج حاسوبي لإيجاد خواص جريان النفاث وتم دراسة العلاقة بين معامل التدفق وأبعاد النفاث الهندسية للوصول إلى احسن تصميم للنفاث. استخدمت طريقة الفروق المحددة لانجاز الحسابات مع شبكة عقدية خاصة، معادلات Navier-Stock للحالة المستقرة بالتكامل مع نموذج(k - ε) للإضطراب تم حلها. الحسابات في هذا العمل تمت لنفاث ذو جزء متقارب بزاوية معين (3.7° -7.7°) يتبعه جزء ثابت المساحة العرضية، تم أخذ ثلاثة قيم لطول الجزء المتقارب وثلاثة لطول الجزء الثابت و ثلاثة لقطر النفاث أيضاً. مدى قيم رقم رينولد كان 1.95 x 10^5 < Re < 3.9 x 10^5 و تم استخدام لغة الحاسبة فورتران.95 النتائج تعطي تصور جيد للعلاقة بين أبعاد النفاث و معامل التدفق حيث النتيجة الرئيسية كانت أن زيادة طول الجزء الثابت المساحة تسمح للطبقة المتاخمة أن تنمو وبالتالي زيادة سمكها وهذا يؤدي إلى نقصان معامل التدفق. مقارنة النتائج مع تنائب برنامج ANSYS أظهرت أن الطريقة المستخدمة ذات دقة كافية وممكن استخد امها لإيجاد معامل التدفق لنفاثات منظومات الري بالرش.

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