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71.
Richard Lakerveld Brahim Benyahia Richard D. Braatz Paul I. Barton 《American Institute of Chemical Engineers》2013,59(10):3671-3685
The design of an effective plant‐wide control strategy is a key challenge for the development of future continuous pharmaceutical processes. This article presents a case study for the design of a plant‐wide control structure for a system inspired by an end‐to‐end continuous pharmaceutical pilot plant. A hierarchical decomposition strategy is used to classify control objectives. A plant‐wide dynamic model of the process is used to generate parametric sensitivities, which provide a basis for the synthesis of control loops. Simulations for selected disturbances illustrate that the critical quality attributes (CQAs) of the final product can be kept close to specification in the presence of significant and persistent disturbances. Furthermore, it is illustrated how selected CQAs of the final product can be brought simultaneously to a new setpoint while maintaining the remaining CQAs at a constant value during this transition. The latter result shows flexibility to control CQAs independently of each other. © 2013 American Institute of Chemical Engineers AIChE J, 59: 3671–3685, 2013 相似文献
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Rachid Essehli Brahim El Bali Ingrid Svoboda Hartmut Fuess 《Materials Research Bulletin》2009,44(4):817-2294
The new titanium oxyphosphate Co0.5TiPO5 has been prepared by solid state reaction. Its structure has been determined by single crystal X-ray diffraction and was further investigated by FT-IR spectroscopy and magnetic measurements. The compound crystallizes in the monoclinic system, S.G: P21/c [a = 7.358(1) Å, b = 7.378(2) Å, c = 7.383(3) Å, β = 119.66(3)°, Z = 4, R1 = 0.0142, wR2 = 0.0429]. The structure can be described as a network of very distorted TiO6 octahedra, in which the Ti4+ ions are displaced from the centres of the octahedra, and slightly distorted PO4 tetrahedra. Half of the octahedral cavities are occupied by Co atoms. The other half of octahedral sites is vacant and favourable for the electrochemical insertion of lithium. The insertion of lithium was studied by galvanostatic charging and discharging between different voltage limits. 相似文献
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A cooperative Bayesian and lower bound estimation in dynamic framed slotted ALOHA algorithm for RFID systems 下载免费PDF全文
Mustapha Benssalah Mustapha Djeddou Brahim Dahou Karim Drouiche Abdelmadjid Maali 《International Journal of Communication Systems》2018,31(13)
A novel estimation scheme that combines Bayesian and lower bound estimating radio frequency identification tag population size is proposed. The developed methodology is based on the fusion between the Bayesian and lower bound estimating techniques. It turns out that the fusion rule is built up thanks to an existing linear relationship between the cited techniques. Simulation results show that the developed technique significantly improves the accuracy of the estimating tag quantity and presents less estimation error. Also, the resulting advanced dynamic framed slotted ALOHA protocol considerably improves the performance and efficiency of the radio frequency identification anti‐collision compared with the most recent protocols using others estimating methods. 相似文献
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Tianxiang Yan Shaokai Ren Xing Ma Feifei Han Liang Fang Biaolin Peng Laijun Liu Xiaojun Kuang Brahim Elouadi 《Journal of Electronic Materials》2018,47(12):7106-7113
(1???x)K0.5Na0.5NbO3-x(Bi0.5K0.5)ZrO3 [abbreviated as (1???x)KNN-xBKZ, 0?≤?x?≤?0.08] lead-free ceramics have been fabricated by a solid-state processing route. Based on the x-ray diffraction data and temperature-dependent dielectric characteristics, an orthorhombic phase for x?≤?0.03 and single rhombohedral one for x?≥?0.05 at room temperature were determined. The cell volume firstly increases, then decreases and finally increases with increasing BKZ, depending on ionic size and crystallographic structure. For the sample of x?=?0.05, a temperature-stable high permittivity (~?1736?±?15%) along with low dielectric loss tangent (≤?5%) is recorded from 158°C to 407°C. In addition, the activation energies of dielectric relaxation and dc conductivity at high temperatures were characterized by impedance spectroscopy. A combined effect of lattice distortion and oxygen vacancies on the magnitude of activation energies was discussed. 相似文献
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Hmidi Riadh Brahim Ali Ben Hmida Fayçal Ben Sellami Anis 《International Journal of Control, Automation and Systems》2020,18(9):2206-2219
International Journal of Control, Automation and Systems - This paper proposes an adaptive sliding mode fault tolerant control design for lipschitz nonlinear system subject to simultaneous actuator... 相似文献
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Matoui Fethi Boussaid Boumedyen Metoui Brahim Abdelkrim Mohamed Naceur 《Intelligent Service Robotics》2020,13(1):147-158
The current study is set to investigate the problem of planning trajectories for a multi-robot system in a dynamic environment. The planning study is conducted in a “barrier-free” and “with obstacle” environment, based on the artificial potential field (APF) technique. This study seeks to improve the APF method in order to have good trajectory planning of a multi-robot system. Also, for multi-robot mobile systems, one of the main technical considerations is the technique used to coordinate the movements of different robots. In this paper, we proposed a centralized architecture for the trajectory planning of a multi-robot system.
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