16 research outputs found
Nonlinear Model-Based Control of Unstable Wells
Get PDFThis paper illustrates the potential of nonlinear model-based control applied for stabilization of unstable flow in oil wells. A simple empirical model is developed that describes the qualitative behavior of the downhole pressure during severe riser slugging. A nonlinear controller is designed by an integrator backstepping approach, and stabilization for open-loop unstable pressure setpoints is demonstrated. The proposed backstepping controller is shown in simulations to perform better than PI and PD controllers for low pressure setpoints, and is in addition easier to tune. Operation at a low pressure setpoint is desirable since it corresponds to a high production flow rate. The simulation results are presented to illustrate the effectiveness of proposed control scheme
The use of bacterial larvicides in mosquito and black fly control programmes in Brazil
Full text linkLa lutte antilarvaire contre les culicides des fosses septiques, l'action du Dursban et du DDT" sur la flore microbienne
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A Long War Begins: Biosimilars Versus Patented Biologics – A Retrospective Analysis Of The Eu-5 And Japanese Erythropoetins Markets
Get PDFISPOR 19th Annual International Meeting Research AbstractsInternational audienc
A Long War Begins: Biosimilars Versus Patented Biologics – A Retrospective Analysis Of The Eu-5 And Japanese Erythropoetins Markets
No full textTo What Extent Can Biosimilars Compete with Brand Name Biologics? A EU-5 Granulocyte-Colony Stimulating Factors Markets Analysis
No full textHémorragie intracérébrale fatale chez un patient atteint d'une leucémie chronique à polynucléaires neutrophiles : à propos d'un cas et revue de la littérature
No full textPHP9 Temporary Use Authorizations: The Economic and Clinical Future of Drugs Used in the French Compassionate Program
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