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Qatar University Institutional Repository
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5537 Publications
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  • Neural network model-based predictive control of liquid–liquid extraction contactors

    Mjalli, Farouq (2004)
    The inherent complex nonlinear dynamic characteristics and time varying transients of the liquid–liquid extraction process draw the attention to the application of nonlinear control techniques. In this work, neural network-based control algorithms were applied to control the product compositions of a Scheibel agitated extractor of type I. Model predictive control algorithm was implemented to control the extractor. The extractor hydrodynamics and mass transfer behavior were modeled using the n...

    Helium separation through polymeric membranes: selectivity targets

    Scholes, Colin A.; Ghosh, Ujjal (2016)
    Gas separation membranes have the potential to recovery and purify helium from natural gas. This can be through direct separation of helium from methane or as part of a natural gas liquefaction process where helium is recovered from the nitrogen rejection unit (NRU) exit gas. Here, membrane gas separation process simulations are undertaken in Aspen HYSYS to determine the required membrane selectivity and process conditions needed to perform these separations. It was determined that two and th...

    العمالة في الصناعات التحويلية بدولة قطر بين هيمنة الوافدين وانزواء المواطنين

    شافعي، نظام (2011)
    تسعى دولة قطر ، شأنها شأن بقية دول مجلس التعاون لدول الخليج العربية ، لتحقيق أهداف متنوعة من خلال تبنيها إستراتيجية التنمية الصناعية ، ومن بينها بكل تأكيد توفير المزيد من فرص العمل لمواطنيها . ولكن على الرغم من مرور أكثر من ثلاثة عقود من الزمن على توجه دولة قطر نحو التنمية الصناعية كخيار استراتيجي للتنمية الاقتصادية ، حيث تؤكد البحوث والدراسات والإحصائيات أنها أرست دعائمها على أرض قطر كقطاع رئيسي من حيث القيمة الإضافية التي حققتها ، وحصتها من إجمالي الناتج المحلي ، إلا أن الصناعة القطرية لم ت...

    R-wave detection: A comparative analysis of four methods using newborn piglet ECG

    Shiying, D.; Fangfei, X.; Lingwood, B.; Mesbah, M.; Boashash, B. (2010)
    In the electrocardiograph (ECG), R-wave is the positive upward deflection in the QRS complex which represents the depolarization of both left and right ventricles. Accurate detection of the R-wave peaks in the ECG plays a primary role in the construction and analysis of the heart rate variability (HRV). Numerous methods have been proposed to enhance the robustness and accuracy of the automatic detection. The majority of these methods have been developed for adult ECG and may not perform adequ...
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