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Article
An Analytical Study for Fluidized Bed Cooler Thermal Design
دراسه تحليليه للتصميم الحراري لبرج متميع مبرد

Author: Damiaa Saad Khudor
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2015 Volume: 33 Issue: 6 Part (A) Engineering Pages: 1504-1517
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

The paper describes an investigation for the thermal design of a fluidized bed cooler and prediction of heat transfer rate among the media categories. It is devoted to the thermal design of such equipment and their application in the industrial fields. It outlines the strategy for the fluidization heat transfer mode and its implementation in industry. The thermal design for fluidized bed cooler is used to furnish a complete design for a fluidized bed cooler of Sodium Bicarbonate. The total thermal load distribution between the air-solid and water-solid along the cooler is calculated according to the thermal equilibrium. The step by step technique was used to accomplish the thermal design of the fluidized bed cooler. It predicts the load, air, solid and water temperature along the trough. The thermal design for fluidized bed cooler revealed to the installation of a heat exchanger consists of (65) horizontal tubes with (33.4) mm diameter and (4) m length inside the bed trough.

يتضمن هذا البحث التنبؤ للتصميم الحراري للمبرد ذو الطبقه المتميعه والتنبؤ بمعدل انتقال الحراره خلال الماده. لقد كثف البحث لدراسه التصميم الحراري لمثل هذه الاجهزه وتطبيقاتها في الحقل الصناعي. يلخص البحث الاستراتيجيه لانتقال الحراره خلال الطبقه المتميعه وتطبيقه في الصناعه. ان التصميم الحراري للمبرد ذو الطبقه المتميعه يستخدم كتصميم متقدم ومتكامل لتبريد كاربونات الصوديوم باستخدام المبرد ذو الطبقه المتميعه. ان توزيع الحمل الحراري الكلي بين الهواء – الصلب وبين الماء على طول المبرد حسب وفقا للتوازن الحراري. لقد تم استخدام تقنيه الخطوه – خطوه وذلك لانجاز التصميم الحراري للمبرد ذو الطبقه المتميعه. تم التنبؤ بالحمل ودرجه حراره كل من الهواء , الصلب والماء على طول الحوض. ان التصميم الحراري للمبرد ذو الطبقه المتميعه يبين ان المبادل الحراري يتكون من (65) انبوبا افقيا بقطر (33.4 mm) وبطول (4 m) داخل الحوض.


Article
Biomechanical evaluation of porous titanium implants (CpTi) fabricated by powder technology

Authors: Dhuha Hussein Mohammed ضحى حسين محمد --- Widad A. H. Alnakkash وداد عبد الهادي النقاش
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2015 Volume: 27 Issue: 1 Pages: 18-25
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: It may be an important prospective clinical use of manufacturing of porous implant for clinicalsituations, such as cases of limitation in bone height, low bone density .The small segment of porous implant aneffective osseointegration allows increasing in contact area provided for small segmented porous provided by itssurface configuration. This study was done to Fabricate porous titanium implants by powder technology, as well asthe observation of removal torque values of porous titanium implants compared to smooth titanium implants.Materials and methods: Twenty porous titanium implants (3.2mm in diameter and 8mm in length) were manufacturedby powder technology using commercially pure titanium powder of ≤75um particles size, with polyvinyl alcoholpowder of 212-300um particle size, as a space holder, by volume ratio (70:30) % respectively. The mixed powder wascompacted using punch and die set -specially designed for this study –under 20 bar then sintering at 900 ºC by theuse of argon gas. Twenty smooth titanium implants were prepared of (3.2mm in diameter and 8mm in length) bylathing of commercially pure titanium rod as a control group. The implants were examined by X-ray diffraction (XRD)and scanning electron microscope (SEM), as well as estimation of porosity percentage. For each tibia of the 20 whiteNew Zealand rabbits, one implant of each type (one porous in right, and the smooth in left tibia), were insertedthrough surgical procedure carried under serial condition. Mechanical test was performed to evaluate the boneimplantinterface, after (2 and 6 weeks) healing periods .Results: Porous implants were obtained successfully by powder technology with 52% porosity and pore size 210um17±. The porous implant showed significantly higher removal torque values when compared to smooth implants atthe two different intervals of examination (2,6 weeks) , this proved to be statistically highly significant, also a highlysignificant difference was noticed for the means of the torque removal values in the same group at differentimplantation , with no evidence of clinical features of inflammatory reaction with both .Conclusions: Powder technology seemed to be particularly advantageous in fabrication of porous titanium. Porousimplant show an increasing bone ingrowth compared with the smooth type represented by higher removal torquefor both healing periods (2, 6) weeks


Article
Temperature Dependence of AC Conductivity and Complex Dielectric Constant of Cd2Si1-xGexO4 Compound
اعتماد التوصيلية المتناوبة وثابت العزل المركب على درجة الحرارة لمركب Cd2Si1-xGexO4

Author: Salma M. Shaban سلمى مهدي شعبان
Journal: Iraqi Journal of Science المجلة العراقية للعلوم ISSN: 00672904/23121637 Year: 2015 Volume: 56 Issue: 2B Pages: 1409-1415
Publisher: Baghdad University جامعة بغداد

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Abstract

In this work, samples of Cd2Si1-xGexO4 prepared by powder technology for (x = 0, 0.3, 0.6) were studied. The effect of (Ge) additives at different ratio of Ge (x=0, 0.3, 0.6) on the behavior of dielectric constant, dielectric loss and a,c conductivity were measured as a function of temperature at a selected frequencies (0.01 – 10) MHz in the temperature range 298 K to 473 K. The dielectric constant and dielectric loss obtained different behavior with the additives of (Ge). The activation energy for the electrical conduction process was studied.

في هذا العمل , درست نماذج Cd2Si1-xGexO4 المحضرة بتكنولوجيا المساحيق للنسب (x = 0, 0.3, 0.6) . درس تاثير اضافة Ge لنسب مختلفة من Ge (x = 0, 0.3, 0.6). على ثابت العزل , فقد العازل والتوصيلية المتناوبة كدالة لدرجة الحرارة ولترددات مختارة (0.01 – 10) MHz في مدى درحات الحرارة 298 كلفن الى 473 كلفن. اكتسب ثابت العزل وفقد العازل سلوك مختلف باضافة Ge . تم دراسة طاقة التنشيط لعملية التوصيل الكهربائي.

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