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Article
Design and Implementation of Adaptive Antenna System in a New LTE 3GPP Transceivers Based Multiwavelet Signals

Author: Mohammed A. Kadhim
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2014 Volume: 10 Issue: 2 Pages: 11-16
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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Abstract

The new Long Term Evolution (LTE) transceivers based multiwavelet signals design and implementation are discussed in this paper. LTE is the evolution of the Universal Mobile Telecommunications System (UMTS) is a third generation mobile cellular system for networks based on the Global System for Mobile Communications (GSM) standard in response to ever‐increasing demands for high quality multimedia services according to users’ expectations; to increase the efficiency of such transceiver successive Adaptive Antenna System (AAS) has been used at receiver to provide an effective reduction of multiuser access interference at an affordable complexity. An AAS has been deployed at the receiver module to reduce the fading effects signal caused by proposed Stanford University Interim (SUI) Channel Models. AAS uses beamforming technique to focus the wireless beam between the base station and the subscriber station. The Least Mean Square (LMS) algorithm is used at the receiver to direct the main beam towards the desired LOS signal and nulls to the multipath signals. It has been demonstrated through MATLAB simulations that the performance of the system is significantly improved by AAS, where beam forming is implemented in the direction of desired user. The results give SNR gain of 1.8dB gained to achieve an error of 10-3 in SUI channels. The performance of the system can be more improved by increasing the number of antennas at receiver.

Keywords

OFDM --- DMWT --- CDMA --- AAS --- LMS --- Beam forming


Article
Design and Implementation of Adaptive Antenna System in Physical Layer CDMA Transceivers Based Multiwavelet Signals

Author: Mohammed A. Kadhim
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2015 Volume: 11 Issue: 1 Pages: 3-8
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 paper, we optimization of the Code division multiple access (CDMA) transceiver by using Adaptive Antenna System (AAS) at the receiver it has been shown that receivers based on successive AAS provide an effective reduction of multiuser access interference at an affordable complexity. The aim of this work is to minimize the bit error rate. An AAS has been deployed at the receiver module to reduce the fading effects signal caused by proposed SUI channels model. AAS uses beamforming technique to focus the wireless beam between the base station and the subscriber station. The Least Mean Square (LMS) algorithm is used at the receiver to direct the main beam towards the desired LOS signal and nulls to the multipath signals. It has been proved through this idea by MATLAB simulations that the performance of the system significantly improves by AAS, where beamforming is implemented in the direction of desired user. The performance of the system can more improve by increasing the number of antennas at receiver.

Keywords

OFDM --- DMWT --- CDMA --- LMS --- Beamforming


Article
Improvement in gas sensitivity of ZnO thin film by doping with Ti
تحسين حساسية أغشية الرقيقة للمركب Ti المطعم بنسب مختلفة من عنصر Zno

Author: Mohammed A. Kadhim
Journal: journal of kerbala university مجلة جامعة كربلاء ISSN: 18130410 Year: 2016 Volume: 14 Issue: 4 Pages: 1-7
Publisher: Kerbala University جامعة كربلاء

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Abstract

In this work, we explore immaculate and doped ZnO films with Ti for CO gas detecting. Immaculate and doped ZnO layers have been manufactured by puls Laser deposition procedure (PLD) with different doping proportion. Structure and morphological properties have been studied by XRD and AFM to concentrate on the parameters that enhance the gas detecting. Pure ZnO films and Low doping with Ti at room temperature indicating low affectability. Expanding the working temperature and dopant proportion prompts expanding the responsively and lessening stall the reaction time and recuperation time.Keywords: PLS method; XRD diffraction; AFM analysis; Heartbeat Laser; ZnO Layer

في هذا العمل البسيط تبين لنا بتطعيم أغشية المركب ZnO بنسب مختلفة لعنصر Ti لكشف غاز أوكسيد الكاربون CO . قد تم تطعم الاغشية الرقيقةللمركب ZnO بواسطة جهاز (PLD ترسيب الليزر النبضي) وبنسب وزنيه مختلفة من عنصرالتيتانيوم Ti , اجريت فحوصات حيود الاشعة السينية XRD و كذلك فحوصات AFM لمعرفة الخصائص التركيبية على الاغشية النقية والمطعمة وبدرجات حرارة مختلفة والتي أسهمت في تعزيز الكشف على الغاز , كانت الاستجابه ضعيفة للاغشية النقية وكذلك المنخفضة التركيز بينما أزدادت الاستجابة ونقصان وقت رد الفعل وكذلك نقصان وقت الاستعادة عند زيادة التطعيم بعنصر Ti

Keywords


Article
The Role of Autonomic Neuropathy in Predicting Ovarian Hyperstimulation Syndrome

Author: Zahid Mohammed A. Kadhim
Journal: Medical Journal of Babylon مجلة بابل الطبية ISSN: 1812156X 23126760 Year: 2018 Volume: 15 Issue: 1 Pages: 21-24
Publisher: Babylon University جامعة بابل

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Abstract

Background: Ovarian hyperstimulation syndrome (OHSS) is a life-threatening iatrogenic complication of ovarian stimulation during theassisted reproductive technique. Objective: This study was aimed to elucidate the effect of autonomic neuropathy on the occurrence of OHSSduring assisted reproductive techniques. Materials and Methods: One hundred subfertile women underwent ovarian stimulation. The ovarianresponse was diagnosed by hormone concentrations and vaginal ultrasound. Autonomic function tests were done for all patients using Ewing’sprotocol. Results: Twenty-eight percent of subfertile women involved in this study had autonomic neuropathy. Out of 100 infertile womenundergoing ovarian stimulation, only 5 (5%) had been developed OHSS, all of them had autonomic neuropathy (P < 0.05). The sensitivity andspecificity of the autonomic neuropathy for the occurrence of OHSS was 100% and 58% which was insignificant (P > 0.05). The best cutoffscore associated with OHSS was ≥1.5 which detected from receiver operating characteristic curve. The odds ratio for the absence of OHSSin patients without neuropathy was 9.891, which was significant as compared with the patients with neuropathy (P < 0.05). Conclusion: Thestudy concludes that ovarian stimulation may cause autonomic function disturbance which can predict OHSS.


Article
Properties Study And Formation of Hard Pans in Some Alluvial Soil Areas of Southern Iraq
دراسة صفات وتكوين الطبقات الصلبة في بعض مناطق الترب الرسوبية جنوبي العراق

Author: Mohammed A . kadhim محمد أحمد كاظم
Journal: Thi-Qar University Journal for Agricultural Researches مجلة جامعة ذي قار للبحوث الزراعية ISSN: 22225005 Year: 2012 Volume: 2 Issue: 2222-5005 Pages: 89-106
Publisher: Thi-Qar University جامعة ذي قار

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Abstract

The study was conducted to selected of Hard pans and formation study it , in some Mesopotamia plain regions in province of basrah southern Iraq . The study area was chosen in west of shattAl – Arab river in Abul – Khasseb which including some regions variant in micro relief . Four pedons selected represented for the study area . The data of morphological properties indicated that the hard pans has been found at depth 75 – 125 cm with thickness varied at about 15 – 30 cm in study area , and it is hard pan in the pedon with fine texture and vary hard consistency in dry state while it is very firm in moist state , for wet state is slightly sticky to sticky and very plastic . Also , it showed angular – blocky structure with grade of type strong and class changed from medium to coarse . and it has a few very fine pores. The hard pans are different according to the colour from the adjacent remaining pans of values at about 10YR 7/2 – 10 YR7/3 in the dry state while in wet state the values were at about 10YR 5/3 – 10 YR5/4 .while the data of soil physical properties indicate that clay pans have clayey texture in most pedons of study area , with dominate for clay particles of values at about 495.11 – 560.20gm .kg-1 and decreasing in silt and sand particles content.

اجريت هذه الدراسة لتحديد الطبقات الصماء ودراسة تكوينها في بعض مناطق السهل الرسوبي في محافظة البصرة جنوبي العراق . اختيرت منطقة الدراسة الواقعة غرب شط العرب في منطقة ابو الخصيب التي تضم بعض المناطق المختلفة في تضاريس الارض الدقيقة. تم تحديد اربع بيدونات ممثلة لمنطقة الدراسة .بينت النتائج المورفولوجية وجود طبقات صماء على اعماق تتراوح بين 75 – 125 سم وبسمك تراوح بين15 – 30 سم في منطقة الدراسة ، و تميزت بكونها صلبة وذات نسجة ناعمة وقوامية صلبة جدا في حالة الجفاف و متماسكة جدا في حالة الترطيب ، اما في حالة الابتلال فكانت بين قليلة اللزوجة الى لزجة ولدنة جدا وتميزت ببناء كتلي حاد الزوايا مع درجة وضوح من النوع القوي ووحدة بناء تتراوح بين المتوسط الى الخشن . وان المسامات فيها قليلة ودقيقة جدا. واختلفت الطبقات الصماء من حيث اللون عن بقية الافاق المجاورة لها اذ تميزت بقيمة لون تراوح بين 10YR7/2 – 10YR7/3 في الحالة الجافة اما في الحالة الرطبة فقد كانت تتراوح بين 10YR5/3 – 10YR5/4 . وبينت نتائج الدراسة بان الطبقات الصماء من نوع Clay pan تميزت بنسجة طينية في معظم بيدونات منطقة الدراسة حيث كانت السيادة لدقائق الطين اذ تراوحت بين 495.11 – 0560.2 غم كغم- 1 وانخفاض في محتوى دقائق الغرين والرمل . واختلفت قيم الكثافة الظاهرية في الطبقات الصلبة مقارنة بالطبقات المجاورة لها حيث كانت اعلى القيم في الطبقات الصماء وتراوحت بين 1.58 – 1.60 ميكاغرام م3- وذات ايصالية مائية منخفضة جدا عن بقية الطبقات التي تقع فوقها وتراوحت بين 0.004 – 0.0062 سم يوم- 1 وتميزت الطبقات الصماء بكونها الاقل مسامية من الطبقات المجاورة حيث تراوحت مساميتها بين 37.25 – 39.69 % .


Article
Effect of Sediments Fluvial Source in Some Properties of Alluvial Soils abutting for Shatt Alarab River.
تأثير مصدر الرواسب النهرية في بعض خصائص الترب الرسوبية المحاذية لنهر شط العرب

Author: Mohammed A. Kadhim محمد أحمد كاظم
Journal: JOURNAL OF THI-QAR SCIENCE مجلة علوم ذي قار ISSN: 19918690 Year: 2013 Volume: 3 Issue: 4 Pages: 65-78
Publisher: Thi-Qar University جامعة ذي قار

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Abstract

The study was conducted to know the effect of sediments fluvial source on some alluvial soils properties abutting for Shatt Alarab River. Two strips were chosen the first stripe at Alharitha region which represented by pedons 1 and 2, while the second stripe at Al seeba region which represented by pedons 3 and 4. The sedimentation sources were Shatt Alarab at the first stripe while the sedimentation sources were Karun River and Shatt Alarab at the second stripe. The result of investigated soils showed varies in some morphology properties according to landscape position and the different sedimentation sources (river). There are variations in the soil color values through the Hue which was at the first stripe 10 YR while at the second stripe was 7.5 YR and different Value and Chroma between the two stripes. Also, the dominance structure was angular blocky and this showed effect of sedimentation type and its source and sedimentation process conditions. The results of physical analysis showed sudden variation of texture has been found in both vertical and horizontal direction with dominance of clay and silt particles and decreasing in sand particle percent except the pedon 1 and 3 with horizons moderate fine texture and horizons moderate . And that dependes on sedimentation rate according to distance from the sedimentation sources (river). The bulk density was increases with increasing the depth comparing with surface horizon and the lower values appears in the pedon 1. The results of chemical analysis was indicated that organic matter content at about 2.20 – 12.20 gm .kg-1 and the highest values appear in a surface horizons especially in the pedon 1 . Also the data showed that CaCO3 content was increase in the area of study with homogenous in depth at values of 165 – 455 gm .kg-1 , as well E.C values varies from low to medium values in the first stripe while the soils in the second stripe appeared of ahigh salinity values . The pH values were within natural range of Iraqi soils in the two strips at values about (7.12 – 8.11).

اجريت هذه الدراسة لمعرفة تأثير مصدر الرواسب النهرية على بعض صفات الترب الرسوبية المحاذية لنهر شط العرب ، اختير مسارين الاول في منطقة الهارثة ويمثل البيدونين 1 و 2 والثاني في ناحية السيبة ويمثل البيدونين 3 و 4 ويكون مصدر الترسيب في المسار الاول هو نهر شط العرب اما المسار الثاني فيكون نهر شط العرب و نهر الكارون القادم من الأراضي الإيرانية . اظهرت نتائج تحريات التربة وجود تغاير في بعض صفات الترب المورفولوجية بين المواقع المدروسة بموجب موقع منظور الارض واختلاف مصدر الترسيب ( النهر ). يلاحظ وجود تغاير في قيمة اللون من خلال الطول الموجي اذ كان في المسار الاول 10YR بينما في المسار الثاني كان 7.5YR واختلفت شدة اللون ودرجة النقاوة بين المسارين ، وكانت السيادة للبناء الكتلي حاد الزوايا بين المسارين وهذا يظهر تأثير نـوع الرواسب و مصدرها وظروف عملية الترسيب. بينت نتائج التحليل الفيزيائي وجود تغاير في نسجة التربة لكلا الاتجاهين العمودي والافقي مع سيادة لدقائق الطين والغرين وانخفاض في نسبة دقائق الرمل بأستثناء البيدونين 1 و 3 ذات افاق متوسطة ومتوسطة النعومة ويعتمد ذلك على سرعة الترسيب المرتبطة بالقرب والبعد عن مصدر الترسيب ( النهر)، ازدادت قيم الكثافة الظاهرية مع عمق التربة مقارنة بالآفاق السطحية وان اقل قيم لها ظهرت في البيدون 1 . بينت نتائج التحليل الكيميائي ان محتوى المادة العضوية تراوح بين 2.20 – 12.20 غم . كغم -1 تربة وان اعلى القيم ظهرت في الآفاق السطحية وبالآخص في البيدون 1 ، ولوحظ ارتفاع محتوى كاربونات الكالسيوم في عموم منطقة الدراسة مع التجانس مع العمق و تراوحت القيم بين 165 – 455 غم.كغم-1 . تراوحت ملوحة التربة بين الواطئة الى المتوسطة في المسار الاول اذ بلغت كمعدل 9.37 ديسيسمنز . م -1 في حين اظهرت الترب في المسار الثاني ملوحة عالية بسبب تأثرها بنهر الكارون وكمعدل 40.70 ديسيسمنز . م -1 . و كانت قيم تفاعل التربة ضمن المدى الطبيعي للترب العراقية في المسارين و تراوحت بين 7.12 – 8.11.

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Article
ULTRASOUND VERSUS MAGNETIC RESONANCE CHOLANGIO-PANCREATOGRAPHY IN THE DIAGNOSIS OF SUSPECTED EXTRA-HEPATIC INTRINSIC BILIARY OBSTRUCTION

Author: Mohammed A. Kadhim محمد عبد كاظم
Journal: IRAQI JOURNAL OF MEDICAL SCIENCES المجلة العراقية للعلوم الطبية ISSN: P16816579,E22244719 Year: 2013 Volume: 11 Issue: 4 Pages: 340-347
Publisher: Al-Nahrain University جامعة النهرين

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Abstract

Background:Evaluation of obstructive jaundice is a common clinical problem.Objective:To compare diagnostic accuracy, sensitivity and specificity of ultrasound and Magnetic Resonance Cholangio-Pancreatography in the diagnosis of intrinsic obstructive biliary disease.Methods:One hundred and sixty patients with an obstructive jaundice for whom ultrasound (U/S), magnetic resonance imaging (MRI) and Magnetic Resonance Cholangio-Pancreatography (MRCP) were performed. The final diagnosis was confirmed by surgery, tissue biopsy and/or Endoscopic Retrograde Cholangio-Pancreatography (ERCP) in some cases.Results:Of the 164 patients, 102 (62.2%) were found to have choledocholithiasis, 42 patients (25.6%) with benign stenosis and 20 patients (12.2%) had cholangiocarcinomas. Regarding choledocholithiasis, U/S examination showed a diagnostic accuracy of 80.15% with sensitivity of 71.08% and a specificity of 95.83 %. Conversely, MRCP showed a diagnostic accuracy of 93.89%, sensitivity of 93.97% and a specificity of 93.75 %. Regarding benign stenosis: U/S showed a diagnostic accuracy of 78.62% with a sensitivity of 16.67 % and a specificity of 97.29%. The diagnostic accuracy of MRCP was 93.13%, with a sensitivity of 90% and a specificity of 94.05%. In malignant stenosis: of the 20 patients with cholangiocarcinomas, 6 were localized in the upper third or hilar biliary tract (Klatskin tumor), 4 in the mid third and 10 in the distal third of the common bile duct (CBD). The diagnostic accuracy of US in malignant stenosis was 93.13%, with a sensitivity of 61.12% and a specificity of 98.23%. For MRCP, the diagnostic accuracy in detecting malignant stenosis was 93.89%, with a sensitivity of 72.23% and specificity of 97.34%. In all cases, no difference was noticed when comparing US and MRCP.Conclusion:Lithiasis was the most common cause of extra-hepatic intrinsic biliary obstructions. U/S is considered the first choice option in the diagnostic imaging of obstructive disease. If laboratory and clinical findings are supported by U/S, ERCP is required for therapeutic purposes, or if necessary surgery is performed. Ultrasound is highly reliable for ruling out benign stenosis, though not for demonstrating their presence. MRCP is required only for staging of malignant stenosis, or if the suspicion posed by clinical and laboratory findings is not confirmed at U/S.Key words:Ultrasound, MRCP, extra-hepatic intrinsic biliary obstruction.

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Article
The Influence of annealing temperature on Structural and Optical Properties for thin ZnO Films Prepared by pulse laser deposition
تاثيردرجة حرارة التلدين على الخصائص التركيبية والبصرية لغشاء أوكسيد الخارصين المحضر بطريقة الترسييب بالليزر النبضي

Authors: Mohammed A. Kadhim --- Mohammed O. Salman
Journal: journal of kerbala university مجلة جامعة كربلاء ISSN: 18130410 Year: 2015 Volume: 13 Issue: 1 Pages: 131-140
Publisher: Kerbala University جامعة كربلاء

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Abstract

In this work, structural and optical properties for thin ZnO films prepared by pulse laser deposition technique, on glass substrates, have been studied as a function of annealing temperature. This study shows that the films have energy gap decreases from 3.26 eV to 3.14 with increasing Ta from RT to 673 K.

تم في هذا البحث دراسة الخصائص التركيبية والبصرية لأغشية أوكسيد الخارصين و المحضرة بطريق الترسيب بالليزر النبضي على أرضيات زجاجية كدالة لدرجة حرارة التلدين . بينت هذه الدراسة أن الاغشية تمتلك فجوة طاقة تتغير من 3.26 الى 3.14 الكترون فولت عند زيادة درجة حرارة التلدين من درجة حرارة الغرفة الى 673 كلفن

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Article
The frequency of thyroid carcinoma in patients with solitary and multiple nodules utilizing ultrasound guided fine needle aspiration cytology (FNAC): A prospective study(Thyroid carcinoma and U/S guided FNA)

Authors: Qahtan A. Mahdi --- Basim S. Ahmed --- Mohammed A. Kadhim
Journal: Journal of the Faculty of Medicine مجلة كلية الطب ISSN: 00419419 Year: 2010 Volume: 52 Issue: 2 Pages: 136-140
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: Population studies suggest that 3–8% of asymptomatic adults have thyroid nodules. Nodules have a 5–15% prevalence of malignancy. Fine-needle aspiration cytology is the primary and frequently initial tool for assessing the risk of malignancy in thyroid nodules and selecting patients for thyroid surgery. Patients and Methods: This prospective study was done during the period from June 2007 to November 2008. The study includes 141 patients with palpable solitary or multiple thyroid nodules. Only patients with normal or low TSH values were referred for ultrasound examination and ultrasound guided FNAC, which were done using fine needles (G 20).
Results: eleven patients (7.8%) have insufficient or non-diagnostic aspirates and were excluded from the study. Of the remaining 130 patients that were included in our study, only 20 patients had thyroid carcinoma (15.3%). Seventy-nine patients (60.7%) had solitary nodule larger than 10 mm in largest dimension and 51 patients (39.3%) had two or more such nodules. The rate of cancer in males with thyroid nodules was higher than in females. The prevalence of thyroid cancer did not differ between patients with a solitary thyroid nodule (12 of 79 patients, 15.1%) and patients with multiple nodules (8 of 51 patients, 15.7%), the deference is statistically insignificant (P = 0.95). A nodule that is one of several nodules had a lower likelihood of being malignant than did a solitary nodule: (8.9% versus 15.1%) (P < 0.001).
Conclusion: Ultrasound guided FNAC is the primary and frequently initial tool for assessing the risk of malignancy in thyroid nodules. The prevalence of thyroid cancer did not differ between patients with a solitary thyroid nodule and those with multiple thyroid nodules. FNAC have limited role in cytological diagnosis of follicular carcinomas, unless it is confirmed by histopathological diagnosis.


Article
A Synthesis of Thiopyran Pyridinium Perchlorate Compounds

Authors: Marwan F. All-Heety --- Sameaa J. Al-Bayati --- Mohammed A. Kadhim --- Rasha A. Jesama
Journal: Al-Nahrain Journal of Science مجلة النهرين للعلوم ISSN: (print)26635453,(online)26635461 Year: 2013 Volume: 16 Issue: 3 Pages: 7-18
Publisher: Al-Nahrain University جامعة النهرين

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Abstract

Asynthesis of four pyridinium perchlorate compounds have been prepared from reaction one mole pyrylium salt (product already) with one mole cysteine in room temp. and diagnosed spectrally (FT-IR., 1H-NMR) in addition to the accurate quantitative elemental analysis.Asynthesis of sixteen Thiopyranpyridinium perchlorate compounds from reaction one mole from pyridinium compounds produced with one mole pyrylium salt (product already) under zero temp. very good yields that were diagnosed spectrally (FT-IR., 1H-NMR) in addition to the accurate quantitative elemental analysis.

تم تحضير اربع مركبات من مركبات البريدينيوم وذلك من خلال مفاعلة واحد مول من املاح البايريليوم (المحضرة مسبقا) مع مول واحد من الـ (2-امينواثلين ثايول) في درجة حرارة الغرفة وتم تشخيصها طيفيا بوساطة طيف (الاشعة تحت الحمراء وطيف الرنين النووي المغناطيسي والتحليل الكمي للعناصر).ومن خلال مركبات البريدينيوم المحضرة تم مفاعلة واحد مول من مركبات البريدينيوم مع واحد مول من املاح البايريليوم (المحضرة مسبقا) في درجة حرارة اقل من (الصفر المئوي) ومن خلال هذه العملية تم الحصول على ستة عشر مركبا من مركبات الثايوبايرين بايريدينيوم بركلورات بمنتوج جيد جدا وتم تشخيصها طيفيا بوساطة طيف (الاشعة تحت الحمراء وطيف الرنين النووي المغناطيسي والتحليل الكمي للعناصر).

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