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Article
Assessment of the effectiveness of the manufactured chemo-mechanical caries removal on caries removal

Authors: Musab H. Saeed مصعب سعيد --- Haitham J. Al-Azzawi هيثم العزاوي --- Amer M. Al-Ani امير العاني
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2005 Volume: 17 Issue: 2 Pages: 1-4
Publisher: Baghdad University جامعة بغداد

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Background: Chemo mechanical caries removal systems has been discussed as an alternative to conventional caries removal. This study assesses the efficacy of a chemo- mechanical caries removal technique in caries removal.Material and methods: Forty five decayed extracted human teeth were used in the present study. After initial opening through the enamel, different concentrations of the chemo-mechanical caries removal solution were placed in the cavity and excavation of the caries was performed.Results: After probing and visual inspection, with the use of the DIAGNOdent caries detecting device, and after histological examination, the concentrations of 0.5% and 0.7% were shown to be equally effective in removal of caries and more potent than the 0.2% concentration.Conclusion: 0.5 % concentration of the manufactured chemo- mechanical caries removal is the optimal concentration that can be used in dentinal caries removal.


Article
Histopathological examination of the chemomechanical caries removal effect on the human pulp

Authors: Musab H. Saeed مصعب سعيد --- Haitham J. Al-Azzawi هيثم العزاوي --- Amer M. Al-Ani امير العاني
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2005 Volume: 17 Issue: 2 Pages: 21-23
Publisher: Baghdad University جامعة بغداد

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Background: Chemo mechanical caries removal systems have been discussed as an alternative to conventional caries removal. This study examines the effect of the chemo- mechanical caries removal material on the human pup.Material and methods: Forty eight maxillary first premolars from twenty four patient ( 18 male and 6 male) were studied and selected from patients need orthodontic treatment .class V cavity was done in each tooth and the material put inside the cavity for 20 sec, the extraction procedure done after 20minutes, 24 hours and 4 days .Results: The histological examination of 0.5 % Chemo-mechanical caries removal at the three periods showed that there is no significant effect on the pulp of the tooth.Conclusion: 0.5 % concentration of the manufactured chemo- mechanical caries removal can be used in dentinal caries removal safely with out any adverse effect on the pulp


Article
Study Mechanisms and Kinetics of removal Cadmium Ions from Aqueous soultions on Bentonite surface
دراسة ميكانيكية وحركية ازالة ايونات الكادميوم الثنائي من محاليلها المائية على سطح البنتونايت

Authors: Eman. T. Kareem --- Muneer. A. AL-Da'amy --- Mohammad. J. Hassan --- Sumea. M. Husen
Journal: journal of kerbala university مجلة جامعة كربلاء ISSN: 18130410 Year: 2008 Volume: 6 Issue: 3 Pages: 1-8
Publisher: Kerbala University جامعة كربلاء

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In this paper a study was carried out to estimate the ability of Bentonite clay as a new adsorbent surface for removal and adsorption of Cadmium ion from aqueous solutions . The effect of contact time was evaluted and found that the removal process of Cadmium Ion by Bentoniite surafce was reached complete equilibrium at 60 min .The maximum removal or adsorption of Cadmium ion by Bentonite adsorbent were found 87.2% at 40 min . The kinetic results were well fitted to lagergren pseudo – second order models . This behavior was discussed depending on the chemical structure of Cadmium ion and Bentonite surface area. The intraparticle difusion model was also used to studied the kinetics and mechanisms of Cadmium Ion removal . Results model plays a significant role in the adsorption mechanism

يتضمن البحث دراسة فعالية سطح طين البنتونايت كسطح ماز جديد لازالة و امتزاز ايونات الكادميوم من المحاليل المائية . تم دراسة تاثير زمن التماس لعملية ازالة ايون الكادميوم بواسطة سطح البنتونايت حيث وجد ان عملية الامتزاز تصل الى حالة التوازن عند الزمن 60 دقيقة . وجد ان كمية الامتزاز العظمى لايون الكادميوم هي 87.2% عند زمن مقداره 40 دقيقة . اظهرت نتائج حركية الامتزاز بان عملية الامتزاز تتبع موديل لاجرجرين للمرتبة الثانية- الكاذبة . وقد نوقش هذا السلوك على ضوء التركيب الكيميائي لايون الكادميوم و مساحة سطح البنتونايت . كذلك تم دراسة ميكانيكية ازالة ايون الكادميوم بالاعتماد على موديل الانتشار الضمني وقد بينت النتائج ان الانتشار الضمني للدقائق يلعب دورا رئيسيا في عملية الامتزاز .


Article
Removal of Iron (Iii) Ion from Aqueous Solution using Polyacrylic Acid Hydorgel Beads as Adsorbent
إزالة ايون الحديد الثلاثي من المحاليل المائية باستخدام حبيبات الجل المائية لمتعدد حامض الاكريلك كمادة مازه

Authors: Mouayad Q. Al-Abachi مويد قاسم العبايجي --- Nagam Shaker Al- Awady نغم شاكر العوادي --- Ahmed. M. Al- Anbakey احمد مهدي العنبكي
Journal: Iraqi Journal of Science المجلة العراقية للعلوم ISSN: 00672904/23121637 Year: 2013 Volume: 54 Issue: 4 Pages: 775-781
Publisher: Baghdad University جامعة بغداد

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Abstract

This research focuses on the removal and adsorption of Fe (III) ion using a low cost commercial polyacrylic acid hydrogel beads as adsorbent. The effects of time, initial concentration and pH on the metal ion adsorption capacity were investigated. The regeneration of the hydrogel bead and recovery of the metal ion adsorbed were study. The adsorption isotherm models were applied on experimental data and it is shown that the Langmuir model was the best one for Fe (III) ion removal. The maximum capacity was calculated. First-order and second- order kinetic models were used and it is shown that the experimental data was in reliable compliance with the first- order model with R2 value of (0.9935, 0.9011, 0.9695, 0.9912) for all concentrations which were used in this study (100, 200, 300, 400) mg.L-1 respectively.

هذا البحث يتضمن دراسة عملية إزالة و امتزاز ايون الحديد الثلاثي من محاليله المائيه باستخدام متعدد حامض الاكريلك كمادة مازه. لقد تم دراسة تأثير الزمن, التركيز الابتدائي و الدالة الحامضية. كما تم تطبيق الموديلات الايزوثيرمية للامتزاز على النتائج المستحصلة وبينت ان موديل لانكماير هو الأفضل لايون الحديد الثلاثي. لقد تم حساب السعة القصوى,كما تمت دراسة عملية استرجاع ايون الفلز الممتز داخل حبيبة الجل المائية وتهيئة الحبيبة للاستخدام لمرة أخرى. طبقت معادلتي الدرجة الأولى و الثانية على النتائج المستحصلة وتبين إنها تتفق مع الدرجة الأولى وحسب قيمة معامل الخطية العالية .9935, 0.9011, 0.9695, 0.9912) 0) للتراكز المستخدمة في الدراسة ((100,200,300,400 ملغلتر على التعاقب.

Keywords

Removal --- Polyacrylic acid --- Hydrogel


Article
Dye Removal from Wastewater Using Iron Salts

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Abstract

This investigation was carried out to study the treatment and recycling of wastewater in the cotton textile industry for an effluent containing three dyes: direct blue, sulphur black and vat yellow. The reuse of such effluent can only be made possible by appropriate treatment method such as chemical coagulation. Ferrous and ferric sulphate with and without calcium hydroxide were employed in this study as the chemical coagulants. The results showed that the percentage removal of direct blue ranged between 91.4 and 94 , for sulphur black ranged between 98.7 and 99.5 while for vat yellow it was between 97 and 99.


Article
The effects of dentin and chemomechanical caries removal on the shear bond strength of dentin adhesive: An in vitro study

Authors: Nadia M AL–Shakir --- Jabbar H Kamel
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2006 Volume: 6 Issue: SpIss Pages: S84-S91
Publisher: Mosul University جامعة الموصل

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Abstract

to measure the shear bond strength of composite restoration in vitro. Materials and Methods: The adhesion ability of dentin after chemomechanical method (Carisolv™) was measured compared to conventional one (bur) with the sound group which acts as a control. Three age groups (primary, young and old permanent teeth), in addition to two systems of adhesives (All Bond 2 and Optibond FL) were used. After the trimming and polishing of dentin surfaces to expose flat occlusal surfaces of the teeth, the carious lesion was removed by Carisolv™. Sixty teeth were used in this method, also 60 teeth were used in bur method, which are compared to 60 sound teeth. The composite resin was applied to the confined area of bonding measuring 3 mm in diameter, and two layers of composite core measuring 4 mm in height were applied to the rubbery mould. After thermocycling, the samples were stored in distilled water with crystals of thymol for 24 hours before testing. The interfaces between composites and dentin surfaces were loaded with a knife edge rod perpendicular to the long axis of the tooth by the Universal Testing Machine at across head of speed of 1mm/min., the load required to dislodge the restorations and modes of failure were recorded. Results: the primary teeth in sound group have the highest value of shear bond strength than Carisolv and bur treated surfaces with both dentin adhesives. Conclusion: Chemomechanical caries removal has no adverse effects on bonding to caries-affected dentin when modern bonding systems are used and old teeth dentin shows lower bond strength compared to young permanent teeth dentin.


Article
LEAD Removal from Industrial Wastewater by Electrocoagulation process

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Abstract

This investigation was carried out to study the treatment and recycling of wastewater in the Battery industry for an effluent containing lead ion. The reuse of such effluent can only be made possible by appropriate treatment method such as electro coagulation.The electrochemical process, which uses a cell comprised aluminum electrode as anode and stainless steel electrode as cathode was applied to simulated wastewater containing lead ion in concentration 30 – 120 mg/l, at different operational conditions such as current density 0.4-1.2 mA/cm2, pH 6 -10 , and time 10 - 180 minute.The results showed that the best operating conditions for complete lead removal (100%) at maximum concentration 120 mg/l was found to be 1.2 mA/cm2 current density, in alkaline media pH = 10 , and at 120 minute.

في هذا البحث تم دراسة معالجة المياه وتدوير المياه الصناعية وبصورة خاصة في صناعة البطاريات ,التي تحتوي المياه الخارجة منها على ايونات الرصاص.ان عملية التلبيد الكهروكيمياوي تم تطبيقها على خلية متكونة من قطب انود من الالمنيوم والكاثود من الحديد المقاوم للصدأ لدراسة تأثير تغيير ظروف التشغيل على كفاءة عملية المعالجة لتراكيز مختلفة من ايون الرصاص في المياه الصناعية 30-120 مل غرام/لتر عند تغير كثافة التيار من 0.4-1.2 مل امبير/سم2, والدالة الحامضية من 6-10 ,والزمن من 10-180 دقيقة.بناءاً على نتائج الجانب العملي والتجارب المختبرية تم الحصول على ازالة تامة (100%) لايون الرصاص من المياه الملوثة بعد عملية المعالجة ولاعلى تركيز لايونه 120 مل غرام/لتر عند افضل ظروف تشغيل 1.2 مل امبير/سم2 وعند وسط قاعدي وافضل دالة قاعدية تساوي 10 وبزمن 120 دقيقة.


Article
Removal of Cu (ll) From Aqueous Solution Using Polyacrylic Acid Hydrogel Beads as Adsorbent
إزالة ايون النحاس الثنائي من محاليله المائية باستخدام حبيبات الجل المائية لمتعدد حامض الاكريلك كمادة مازه

Authors: Ahmed. M. Al-Anbakey احمد مهدي العنبكي --- Nagam S.Al- Awadye نغم شاكر العوادي --- Mouayad Q. Al-Abachiy مؤيد قاسم العباجي
Journal: Iraqi Journal of Science المجلة العراقية للعلوم ISSN: 00672904/23121637 Year: 2013 Volume: 54 Issue: 2 Pages: 240-248
Publisher: Baghdad University جامعة بغداد

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Abstract

In this article, the adsorption of Cu(ll) ion from aqueous solution into polyacrylic acid (PAA) hydrogel bead has been investigated using a batch method of different temperature (10-30 °C) and different contact time (1-48 hr) to reach the equilibrium of adsorption. Initial concentration and adsorption capacity of the adsorbents is presented, the time required to reach a maximum capacity of bead was about 24hr. The temperature effect on adsorption was studied and the experimental data have been analyzed using the Langmuir and freundlich isotherm models. The adEsorption capacity at equilibrium was found to be 142.68 mg/g; more than 95% of studied cation was removed by the adsorbent. The process is very efficient especially at low concentration of pollutants in aqueous solutions.

في هذا البحث تم دراسة استخدام حبيبات الجل المائية لمتعدد حامض الاكريلك لإزالة وسحب ايون النحاس الثنائي من المحاليل المائية, باستخدام طريقة الدفعات بدرجات حرارية مختلفة تتراوح بين (30 – 10 °م) وبزمن تماس يتراوح بين(1– 48) ساعة لضمان الوصول إلى حالة التوازن . تم دراسة تأثير التركيز الابتدائي و سعة الامتزاز, وبينت النتائج إن الزمن اللازم للوصول إلى أقصى كمية سحب للحبيبات هو 24 ساعة. تم دراسة تأثير درجة الحرارة على عملية سحب ايون النحاس الثنائي , وقد طبقت معادلتي لانكمور وفراندلج لتحليل النتائج المستحصلة. بلغت سعة الامتزاز عند التوازن 142.68 ملغم/غم ونسبة سحب أكثر من 95%. أثبتت الطريقة كفاءة عالية لإزالة ايون النحاس الثنائي من المحاليل المائية وبالأخص التراكيز القليلة.


Article
Removal of Azo Dye Reactive Black 5 By Adsorption onto ZnO and CaO

Author: Wafaa Naser Mohammed Saeed
Journal: journal of kerbala university مجلة جامعة كربلاء ISSN: 18130410 Year: 2013 Volume: 11 Issue: 4 Pages: 321-330
Publisher: Kerbala University جامعة كربلاء

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Abstract

In this study, the adsorption of reactive black 5 dye was carried out byusing various surfaces, namely ZnO and CaO. The validity of the adsorption was evaluated by using UV Spectrophotometry through the determination the amount of adsorbed dye. Various parameters such as pH, adsorbent weight, initial dye concentration and contact time were studied in terms of their effect on the reaction progress. Furthermore, Lagergren’s equation was used to determine adsorption kinetics. It is observed that high removal of dye was obtained at pH=5. Removal of dye was increased by increasing initial dye concentration and contact time. High removal of dye was at the time equivalent of 70 min and reached equilibrium. Increasing of adsorbent weight leads to decrease dye adsorption where 0.1gm was the best weight. For kinetics the reaction onto CaO followed pseudo-first order Lagergren’s equation while the reaction onto ZnO followed pseudo-second order Lagergren’s equation and the adsorbed amount onto CaO surface was more than that of ZnO surface.

تم في هذا البحث دراسة امتزاز صبغة (RB5) باستخدام سطوح مختلفة وهي CaO وZnO وقد تم قياس سرعة الامتزاز باستخدام جهاز قياس المطيافية من خلال تحديد كمية الصبغة الممتزة. كما تم دراسة العديد من العوامل المؤثرة في سرعة التفاعل منها: الدالة الحامضية، وزن السطح الماز، التركيز الابتدائي للصبغة وزمن التماس. بالإضافة الى ذلك تم استخدام معادلة Lagergren لتحديد حركيات الامتزاز. لقد لوحظ ان اعلى ازالة للصبغة كانت عند الدالة الحامضية pH=5 حيث ان ازالة الصبغة كانت تزداد مع زيادة التركيز الابتدائي للصبغة وزمن التماس والذي وصل الى الاتزان عند (70 دقيقة). كما أدت زيادة وزن السطح الماز الى تقليل الامتزاز حيث ان أفضل وزن كان (0.1 gm). أما بالنسبة الى حركيات الامتزاز فان التفاعل كان من الدرجة الاولى الكاذبة على سطح CaO ومن الدرجة الثانية الكاذبة على سطح ZnO وقد كانت كمية الامتزاز على سطح CaO أعلى من الكمية الممتزة على سطح ZnO


Article
Removal of Azo Benzidine Reactive Dye From Aqueous Solution By Adsorption onto ZnO Surface

Author: Wafaa Naser Mohammed Saeed
Journal: journal of kerbala university مجلة جامعة كربلاء ISSN: 18130410 Year: 2014 Volume: 12 Issue: 1 Pages: 11-18
Publisher: Kerbala University جامعة كربلاء

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Abstract

In this study, the adsorption of azo benzidine reactive dye was carried out by using ZnO surface. Various parameters such as pH, adsorbent weight, initial dye concentration and contact time were studied in terms of their effect on the adsorption process. Furthermore, Lagergren’s equation was used to determine adsorption kinetics. It is observed that high removal of dye was obtained at pH=5. Removal of dye was increased by increasing initial dye concentration and contact time. High removal of dye was at the time equivalent of 90 min and reached equilibrium. Increasing of adsorbent weight leads to decrease dye adsorption where 0.1gm was the best weight. For kinetics the reaction onto ZnO followed pseudo-second order Lagergren’s equation.

تم في هذا البحث دراسة امتزاز صبغة الآزو بنزدين على سطح اوكسيد الخارصين. وقد درست العديد من العوامل المؤثرة في سرعة التفاعل منها: الدالة الحامضية، وزن السطح الماز، التركيز الابتدائي للصبغة وزمن التماس. بالإضافة الى ذلك تم استخدام معادلة Lagergren لتحديد حركيات الامتزاز. لقد لوحظ ان اعلى ازالة للصبغة كانت عند الدالة الحامضية pH=5 حيث ان ازالة الصبغة كانت تزداد مع زيادة التركيز الابتدائي للصبغة وزمن التماس والذي وصل الى الاتزان عند (90 دقيقة). كما أدت زيادة وزن السطح الماز الى تقليل الامتزاز حيث ان أفضل وزن كان (0.1 gm). أما بالنسبة الى حركيات الامتزاز فان التفاعل كان من الدرجة الثانية الكاذبة على سطح اوكسيد الخارصين.

Keywords

Azo benzidine --- Adsorption --- Dye --- Removal

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