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Article
Evaluation of Lung diffusing capacity for Carbonmonoxide (DLco) in healthy adolescents

Author: AMJAD F. AHMAD
Journal: Mustansiriya Medical Journal مجلة المستنصرية الطبية ISSN: 20701128 22274081 Year: 2006 Volume: 6 Issue: 1 Pages: 15-24
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

In pulmonary function tests (PFT), the selection of prediction equation for lung diffusing capacity for carbonmonoxide (DLco), remains a problem. If a single equation is selected and used by all laboratories, the variation in percent predicted values would be large enough to cause numerous diagnostic errors. The present study involved 36 healthy adolescents (20 boys and 16 girls aged 13-19 years) with body height (157-170 cm) and body weight (38-63 Kg). Normal values were reported for lung volumes, ventilation and diffusing capacity using spirographic, helium dilution and carbon monoxide single-breath techniques. Values observed in the present study were comparable to Asians studies but lower than those of Westerns. All pulmonary function parameters were significantly higher in boys, mainly due to larger lung volume, in addition to differences in the level of physical activity and social patterns of life. Regardless to sex, indices of lung volume and diffusion increased with age, body height, and surface area, however, best correlation was observed with body height. Gender specific prediction equations were generated for lung diffusing capacity. Lung diffusion corrected for volume (DLco/VA) seemed independent to sex or body size. In conclusion, it is not appropriate to rely on prediction equations derived from western populations who had higher levels of normality for DLco. Furthermore, height was the best single predictor for lung diffusion in adolescence age group.

Keywords

PFT --- DLco --- prediction equations --- adolescence


Article
Prediction of Aerodynamic Coefficients of Missile using Panel Method

Authors: Wisam Mohsin Jabur --- Hussain Y. M. --- Kamil I. AL-Doulaimi
Journal: Journal of Engineering مجلة الهندسة ISSN: 17264073 25203339 Year: 2006 Volume: 12 Issue: 2 Pages: 389-404
Publisher: Baghdad University جامعة بغداد

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Abstract

The low order panel method with Neumann boundary condition have been used to predict the normal force curve slope, the pitching moment curve slope, the center of pressure location and the aerodynamic load distribution for missile in compressible, steady flow. The wing-body-canard interference problem have been solved using two schemes (iterative method and internal singularity method) both are based on the panel method. The normal force curve slope, the pitching moment curve slope and the center of pressure location for a given missile has been predicted using the present numerical method and the DATCOM technique.

تم استخدام طريقة الأواح ذات الدرجة الواطئة مع الظروف المحيطة لنيومان وذلك للتنبا بميل المنحني للقوة العمودية ، عزم الطول، موقع مركز الضغط وتوزيع الأحمال الايروديناميكية لصاروخ في جريان انضغاطي مستقر، أن مشكلة تداخل الجناح مع الجسم ومع الزعنفة الجانبية تم حلها بواسطة طريقتين ( طريقة التكرار وطريقة الوحدة الداخلية ) والطريقتان اساسها طريقة الألواح . أن ميل منحي القوة العمودية ، عزم الطول ، وموقع مركز الغضط للصاروخ المعتمد تم التنبأ به باستخدام الطريقة العددية الحالية وتقنية DATCOM


Article
Development of Statistical Model for the Prediction of Permanent Deformation in Paving Materials

Authors: Abbas F. Jassim --- Namir G. Ahmad --- Hamed M. Alani
Journal: Journal of Engineering مجلة الهندسة ISSN: 17264073 25203339 Year: 2006 Volume: 12 Issue: 2 Pages: 305-316
Publisher: Baghdad University جامعة بغداد

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Abstract

Permanent deformations (rutting) of asphalt pavement which appear in many roads in Iraq have caused a major impact of pavement performance by reducing the useful service life of pavement and creating services hazards for highway users. Therefore, it is important to analyze and investigate this type of distress.The objectives of the present paper include; the analysis of the main contributory factors influencing rutting and development of statistical model for the prediction of permanent deformation this type of distress.To achieved these objective for requirements of data collection, five type of gradation.(40-50) asphalt cement and different types filler are used to prepare three hundred sixty asphalt concrete specimens throughout the work using Marshall method and Superpave system. Most of these specimens are tested by applying diametric creep under different temperatures and stress levels.A statistical model has been developed for prediction of rut depth in local asphalt paving materials as influencing by the factors of asphalt cement, mineral filler type , air voids and environmental temperature.

ان التشوهات الدائمية (التخدد) في التبليط الاسفلتي تظهر في العديد من طرق العراق ، وتسبب تاثيرا رئيسيا على اداء التبليط وذلك عن طريق تقليل العمر الخدمي للتبليط وجعل استخدام هذه الطرق محفوفة بالمخاطر ، لذلك من المهم التحليل والتحري عن هذا النوع من الفشل.ان اهداف الدراسة الحالية تتضمن تحليل العوامل الاساسية المؤثرة في التخدد، وتطوير نموذج احصائي للتنبؤ في المواد الاسفلتية. لتحقيق هذه الاهداف لمتطلبات جمع البيانات فقد تم استخدام خمسة انواع من تدرجات الركام واسفلت نوع (40-50) مع انوع مختلفة من المواد المالئة لتحضير ثلاثمائة وستون نوذج من الاسفلت الكونكريتي خلال فترة الدراسة مستخدمين طريقة مارشال ونظام التبليط الفائق ( Superpave) وقد تم بناء نموذج احصائي للنبؤ بمقدار التخدد في مواد التبليط المحلية والذي يتاثر ببعض العوامل الرئيسية المتمثلة بافجوات الهوائية ونوعية المادة المالئة وكمية الاسفلت ودرجة الحرارة.

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