The Experts below are selected from a list of 3546 Experts worldwide ranked by ideXlab platform
Amal M. Nassar - One of the best experts on this subject based on the ideXlab platform.
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The Rheological Properties of Lube Oil With Terpolymeric Additives
Petroleum Science and Technology, 2014Co-Authors: Nehal S. Ahmed, Amal M. Nassar, Rabab M. Nasser, M. E. Abdel Raouf, Ahmed F. El-kafrawyAbstract:Twelve terpolymeric additives were prepared via free radical chain addition polymerization. The rheological properties of Lube Oil (SAE-30) were studied with and without additives. The prepared terpolymers have a good effect on the viscosity-temperature relationship. The flow curves and viscosity-shear rate curves of the prepared additives doped with Lube Oil were studied and it was found that they behave as Bingham fluids. The sensitivity of the prepared terpolymers to mechanical stresses was studied and it was found that the sensitivity increases with increasing the molecular weight of the prepared additives.
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Synthesis and Evaluation of Viscosity Index Improvers and Pour Point Depressant for Lube Oil
Petroleum Science and Technology, 2008Co-Authors: Amal M. NassarAbstract:In the present work, four compounds were prepared by copolymerization of maleic anhydride with tetradecene to give (A), and then the copolymer (A) was esterified by a series of n-alkanol having different alkyl chain length. The compositions of prepared compounds were determined by molecular weight and by IR spectroscopy. The efficiency of the prepared compounds as viscosity index improvers for Lube Oil was studied. From the data, it was found that the efficiency as viscosity index improvers increases by increasing the concentration of these additives and by increasing the alkyl chain length of the alcohol used. The efficiency of the prepared compounds as pour point depressants for Lube Oil was studied also and shows that the prepared compounds depress the pour point of the Lube Oil successfully.
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Preparation and Evaluation of Acrylate Polymers as Pour Point Depressants for Lube Oil
Petroleum Science and Technology, 2006Co-Authors: Abdel-azim A. Abdel Azim, Nehal S. Ahmed, Amal M. Nassar, Rasha S. KamalAbstract:In the present work, twenty polymeric additives were prepared and used as pour point depressants for Lube Oil, via copolymerization of different ratios of styrene with different esters of acrylic acid. The efficiency of the prepared copolymers as flow improvers (pour point depressants) for a base Lube Oil were studied. It was found that the efficiency increases by decreasing the concentration of the prepared copolymers, decreasing the chain length of alkyl groups. The efficiency decreases by increasing the styrene content in the prepared copolymers.
Rasha S. Kamal - One of the best experts on this subject based on the ideXlab platform.
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Preparation and Evaluation of Some Terpolymers as Lube Oil Additives
Journal of Dispersion Science and Technology, 2011Co-Authors: Amal M. Nasser, Nehal S. Ahmed, Rasha S. KamalAbstract:In the present work, some polymeric additives were prepared to use as viscosity index improvers and pour point depressants for Lube Oil via copolymerization of hexadecylacrylate and dodecylacrylate with styrene. Structure of the prepared compounds was confirmed by infrared spectroscopy and nuclear magnetic resonance. The molecular weights of the prepared copolymers were determined by using gel permeation chromatograph. The efficiency of the prepared terpolymers as viscosity index improvers and pour point depressants for Lube Oil was investigation. It was found that all the prepared terpolymers are effective as viscosity index improvers and pour point depressants. The viscosity index of the prepared terpolymers increases with increasing the concentration of the additives and increases by increasing the percentage of hexadecylacrylate until 70%. The best result for viscosity index of the prepared terpolymers is when the percentage of styrene is 10%. The pour point of the prepared compound decreases with dec...
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Preparation and Evaluation of Acrylate Polymers as Pour Point Depressants for Lube Oil
Petroleum Science and Technology, 2006Co-Authors: Abdel-azim A. Abdel Azim, Nehal S. Ahmed, Amal M. Nassar, Rasha S. KamalAbstract:In the present work, twenty polymeric additives were prepared and used as pour point depressants for Lube Oil, via copolymerization of different ratios of styrene with different esters of acrylic acid. The efficiency of the prepared copolymers as flow improvers (pour point depressants) for a base Lube Oil were studied. It was found that the efficiency increases by decreasing the concentration of the prepared copolymers, decreasing the chain length of alkyl groups. The efficiency decreases by increasing the styrene content in the prepared copolymers.
Shen Zhongru - One of the best experts on this subject based on the ideXlab platform.
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development of soft start control system for dc Lube Oil pumps
IEEE Transactions on Power Electronics, 2010Co-Authors: Xie Meng, Luo Yiping, Shen ZhongruAbstract:In power plants,DC Lube Oil pump is started and stopped still using traditional method,i.e.,switching resis-tors,which may cause severe surge to the DC power system.In addition,frequent opening and closing of the the DC contactor may bring about some issues such as arcing and contact burning off,thus reducing the service life of the con-tactor and resulting in poor reliability.This paper presents a fully-controlled IGBT-based PWM DC motor soft start con-trol system,which solve the problems with the traditional systems and achieve higher reliability and maintenance-free operation.The principle of the system works,system configuration and design,and experimental results are discussed.This DC Lube-Oil pump control system is put into service and greatly enhanced the safety of power plant operation.
Nehal S. Ahmed - One of the best experts on this subject based on the ideXlab platform.
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The Rheological Properties of Lube Oil With Terpolymeric Additives
Petroleum Science and Technology, 2014Co-Authors: Nehal S. Ahmed, Amal M. Nassar, Rabab M. Nasser, M. E. Abdel Raouf, Ahmed F. El-kafrawyAbstract:Twelve terpolymeric additives were prepared via free radical chain addition polymerization. The rheological properties of Lube Oil (SAE-30) were studied with and without additives. The prepared terpolymers have a good effect on the viscosity-temperature relationship. The flow curves and viscosity-shear rate curves of the prepared additives doped with Lube Oil were studied and it was found that they behave as Bingham fluids. The sensitivity of the prepared terpolymers to mechanical stresses was studied and it was found that the sensitivity increases with increasing the molecular weight of the prepared additives.
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investigation of polyacrylates copolymers as Lube Oil viscosity index improvers
Journal of Petroleum Science and Engineering, 2012Co-Authors: Salah A Mohamad, Nehal S. Ahmed, Saeed M Hassanein, Ahmed M RashadAbstract:Abstract Six copolymers, based on polyacrylates, were prepared and evaluated as viscosity index improvers for Lube Oil. The synthesizing process begins by estrification of acrylic acid with different alkyl chain length alcohols (octyl, decyl, octadecyl, tetradecyl, and hexadecyl alcohol), ranging from C 8 to C 16 . The completion of the esterification process was confirmed by FIIR spectrometry. Linear copolymerization was carried out to produce six copolymeric viscosity index improvers. All copolymers were tested for solubility in the selected base Oil (SAE 30) Society of Automotive Engineers. Acceptable solubility in the base Oil has been recorded. Molecular weight of the prepared copolymers was determined by the technique of Gel Permeation Chromatography (GPC). Samples with different concentrations from each copolymer (0.5%, 1%, 1.5%, 2%, 2.5%, 3% by weight) were prepared and evaluated as viscosity index improvers for Lube Oil. It has been found that all of the prepared compounds are effective as viscosity index improvers for Lube Oil, and their effectiveness becomes more pronounced by increasing either the molecular weight of copolymer (140,000–236,000) or the alkyl chain length (C 8 –C 12 ). Effectiveness could be increased by increasing the concentration of the additives in the base Oil (0.5%–3%). There are no reflection points through the tested range of concentrations.
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Preparation and Evaluation of Some Terpolymers as Lube Oil Additives
Journal of Dispersion Science and Technology, 2011Co-Authors: Amal M. Nasser, Nehal S. Ahmed, Rasha S. KamalAbstract:In the present work, some polymeric additives were prepared to use as viscosity index improvers and pour point depressants for Lube Oil via copolymerization of hexadecylacrylate and dodecylacrylate with styrene. Structure of the prepared compounds was confirmed by infrared spectroscopy and nuclear magnetic resonance. The molecular weights of the prepared copolymers were determined by using gel permeation chromatograph. The efficiency of the prepared terpolymers as viscosity index improvers and pour point depressants for Lube Oil was investigation. It was found that all the prepared terpolymers are effective as viscosity index improvers and pour point depressants. The viscosity index of the prepared terpolymers increases with increasing the concentration of the additives and increases by increasing the percentage of hexadecylacrylate until 70%. The best result for viscosity index of the prepared terpolymers is when the percentage of styrene is 10%. The pour point of the prepared compound decreases with dec...
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Preparation and Evaluation of Acrylate Polymers as Pour Point Depressants for Lube Oil
Petroleum Science and Technology, 2006Co-Authors: Abdel-azim A. Abdel Azim, Nehal S. Ahmed, Amal M. Nassar, Rasha S. KamalAbstract:In the present work, twenty polymeric additives were prepared and used as pour point depressants for Lube Oil, via copolymerization of different ratios of styrene with different esters of acrylic acid. The efficiency of the prepared copolymers as flow improvers (pour point depressants) for a base Lube Oil were studied. It was found that the efficiency increases by decreasing the concentration of the prepared copolymers, decreasing the chain length of alkyl groups. The efficiency decreases by increasing the styrene content in the prepared copolymers.
Juli Mrihardjono - One of the best experts on this subject based on the ideXlab platform.
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analisis performa efisiensi auxuliary Oil pump ac Lube Oil pump pada sistem pelumasan turbin unit 10 pltu i jawa tengah rembang efficiency analysis of auxiliary Oil pump ac Lube Oil pump s performace on lubricating turbine system unit 10 pltu central
2013Co-Authors: Fairus Agung Bhekti Wibowo, Juli MrihardjonoAbstract:Pada Tugas Akhir ini dilakukan analisis performa efisiensi AC Lube Oil Pump yang bertujuan untuk mengetahui perbandingan efisiensi perangkat tersebut selama selang waktu satu tahun (3 Desember 2011 – 6 Desember 2011 dan 7 Desember 2012 – 10 Desember 2012) membuat analisa terkait penurunan efisiensi.. Dengan Pengambilan data diambil dengan selang waktu selama 4 jam setiap perhitungannya diharapkan dapat mendapatkan nilai efisiensi yang akurat. Hasil data perhitungan efisiensi rata-rata pada tanggal 3 Desember 2011 – 6 Desember 2011 adalah 82,71%, dan pada tanggal 7 Desember 2012 – 10 Desember 2012 adalah 82,24%. Setelah mendapatkan selisih efisiensi rata – rata selama selang waktu satu tahun yaitu 0,47%, penurunan efisiensi tersebut tidak terlalu signifikan. Penurunan efisiensi yang tidak signifikan tersebut menyatakan bahwa performa AC Lube Oil Pump tidak ada permasalahan berarti dan tidak perlu adanya perbaikan. Kata kunci: Efisiensi, Penurunan Efisiensi, AC Lube Oil Pump Purpose of this final project to compare effieciency and discuss analysis cause of deflation efficiency AC Lube Oil Pump during interval one year, between 3 December 2011 – 6 December 2011 and 7 December 2012 – 10 December 2012. During the process of this analysis, we account efficiency every four hour to made valid result. Result from calculate, average efficiency on 3 December 2011 – 6 December 2011 is 82,71%, and average efficiency on 7 December 2012 – 10 December 2012 is 82,24%. Deviation this calculate is 0,47%, so deflation efficiency is just a little (not significant).This deflation efficiency explain that perform of AC Lube Oil have not problem and don’t need overhaul. Keyword : Efficiency, Deflation efficiency, AC Lube Oil Pump
