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Is co2 laser Hemorrhoidectomy superior to conventional open Hemorrhoidectomy?

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Abstract

Background: Hemorrhoids are one of the mostcommon surgical conditions .Conventionalhaemorrhoidectomy was the traditional operation forthe treatment of hemorrhoids. Other modalities oftreatment had been used as an alternative operationsincluding CO2 laser haemorrhoidectomy.Objectives: To determine the outcome of treatmentof hemorrhoids by using CO2 laserhaemorrhoidectomy and its advantages overconventional surgeryMethods: This is a retrospective comparativeinterventional study of 1024 case of third degreehaemorhoids selected out of 1300 case ofhemorrhoids of different degrees, admitted toALKINDY, ALYERMOUK teaching hospitals andABD ALMAGEED private hospital, from May 1998to July 2002,they were treated by CO2 laserhaemorrhoidectomy and conventional surgery. Theyare divided into 2 groups randomly, 512 cases treatedby CO2 laser (group A), 512 cases treated byconventional surgery (group B). Both groups werestudied regarding operative time, hospital stay,healing time, post operative complications and costeffectiveness.Results: In GROUP A, the operative time rangedfrom 10 to 20 minutes with an average of 13 minutes.The hospital stay ranged from 4 to 12 hours with amean time of 10 hours as all cases were treated asday cases. Post operative pain was minimal in 50% ofpatients and required simple analgesia for treatmentwhile 50% had no pain. Bleeding occurred in lessthan 1% of cases, anal stenosis 3.3%, Infectionrecorded in 0.58% of patients.In GROUP B, Theoperative time ranged from 15 to 25 minutes with anaverage time of (19) minutes, hospital stay rangedfrom 24 to 48 hours with a mean time of 28 hours.Post operative pain recorded in all the patients(100%) and required narcotic analgesia for treatment,25 patients (4.8%) had varying degrees of bleeding,40 patients (7.8%) had infection, 25 patients (4.8%)had anal stenosis.In group A due to shorter hospitalstay, earlier healing of wounds, earlier return to workwhich was within 7 to 10 days, the surgical treatmentproved to be cost effective.Conclusion: CO2 laser Hemorrhoidectomy wasfound to be easy and safe procedure with lower rateof complications, shorter hospital stay and costeffective.

Keywords

Co2 --- Laser --- Hemorrhoids


Article
SOLUBILITY PREDICTION OF CO2 IN SEVERAL PHYSICAL LIQUID SOLVENTS USING CHEMCAD AND HYSYS SIMULATORS
تقدير ذوبانية غاز ثاني اوكسيد الكاربون في بعض المذيبات الفيزياوية السائلة باستعمال برنامجي المحاكاة CHEMCAD و HYSYS

Author: AbdulMonem A. Karim عبد المنعم عباس كريم
Journal: DIYALA JOURNAL OF ENGINEERING SCIENCES مجلة ديالى للعلوم الهندسية ISSN: 19998716/26166909 Year: 2010 Volume: Engineering Sc. Conference Issue: First Pages: 356-373
Publisher: Diyala University جامعة ديالى

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Abstract

ABSTRACT:- CHEMCAD and HYSYS process simulators were used to analysis the literature experimental data and predict the solubility of CO2 in three physical solvents (sulfolane, propylene carbonate (PC), and n-methyl-2-pyrrolidone (NMP)) at different temperatures (298.15 , 313.15 , 323.15, and 373.15 K). Two thermodynamic models were used, the first using Peng-Robinson equation of state (PR-EOS) and the second using Soave-Redlich-Kwong equation of state (SRK-EOS). The solubility data of CO2 in all three physical solvents systems were correlated with CHEMCAD simulator using the SRK model without modification (kij = 0).The results showed a small deviation (less than 5%), but higher deviation (about 10%) was noticed only for CO2-NMP system at temperature 373 K. Whereas the results of PR model showed a high deviation (about 20%) with all the three physical solvents systems. Modifications performed by editing user defined binary interaction parameters (BIP) of the systems used, give good results for both simulators. Keywords:- Solubility prediction of CO2, Physical solvents, CHEMCAD and HYSYS Process Simulators, PR-EOS, SRK-EOS.

الخلاصة استعمل برنامجي المحاكاة CHEMCAD و HYSYS لتحليل البيانات التجريبية المنشورة في الدوريات العلمية لذوبانية غاز ثاني اوكسيد الكاربون في عدد من المذيبات الفيزياوية السائلة وهي السلفولان (Sulfolane) والبروبلين كاربونيت (PC) والنورمل مثيل بايروليدون (NMP) في درجات حرارة مختلفة ( 298.15) و ( 313.15) و ( 323.15) و (373.15) كلفن . واستعمل موديلين لديناميك الحرارة وهما ( (PR و ( SRK). إن نتائج برنامج CHEMCAD ولموديل (SRK) ، ولمعلومات اتزان الأطوار التجريبية للغاز مع جميع المذيبات الثلاثة ، وبدون أي تحسين للموديلين. أظهرت حيودا قليلا (بحدود 5%) . وأظهرت حيودا عاليا (10%) فقط مع الغاز و المذيب (NMP) عند ارتفاع درجة الحرارة إلى ( 373.15 K). أما نتائج الموديل (PR) ، ومن دون تحسين للموديل ، ولجميع المذيبات الفيزيائية الثلاثة، أظهرت حيودا عاليا ( 20%) . وعند تحسين موديلات ديناميك الحرارة بتصحيح قيمة معامل الترابط الثنائي للغاز مع المذيبات الثلاثة ، أعطت نتائج تطابق جيدة مع البيانات التجريبية ولكل من برنامجي المحاكاة CHEMCAD و HYSYS.الكلمات الدالة: اتزان الأطوار غاز-سائل ، غاز ثاني اوكسيد الكاربون ، المذيبات الفيزيائية ، برامج المحاكاة ، CHEMCAD ، HYSYS ، موديلات ديناميك الحرارة ، معادلة الحالة.

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