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Nguyen Phuong Tung,Nguyen Thi Phuong Phong,Nguyen Hoang Duy,Nguyen Quoc Hung 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.5
This research was conducted to experimentally screen the suitability of acrylamido-2- methylpropane sulfonic acid-acrylamide (AMPS-AM) copolymer-based nanogels for using as sealants to shut-off water channels in the high-temperature and high-salinity reservoir conditions of the White Tiger oil feld. Via in situ intercalative free-radical copolymerization, nanogels have been prepared from montmorillonite-alkyl ammonium clay, AMPS and AM. Two primary compositions of nanogel systems were chosen. A mixture of hexamethylenetetramine (HMTA)/phenyl acetate (PhAc) was used as a crosslinking system. The results obtained from screening the gel properties by using the bottle test method, the test under nitrogen pressure and core ooding under imitated reservoir conditions show that the NANOSEAL-1 and the NANOSEAL-2 nanogels can well satisfy the VietsovPetro (VSP) technical requirements for water isolation materials. This research was conducted to experimentally screen the suitability of acrylamido-2- methylpropane sulfonic acid-acrylamide (AMPS-AM) copolymer-based nanogels for using as sealants to shut-off water channels in the high-temperature and high-salinity reservoir conditions of the White Tiger oil feld. Via in situ intercalative free-radical copolymerization, nanogels have been prepared from montmorillonite-alkyl ammonium clay, AMPS and AM. Two primary compositions of nanogel systems were chosen. A mixture of hexamethylenetetramine (HMTA)/phenyl acetate (PhAc) was used as a crosslinking system. The results obtained from screening the gel properties by using the bottle test method, the test under nitrogen pressure and core ooding under imitated reservoir conditions show that the NANOSEAL-1 and the NANOSEAL-2 nanogels can well satisfy the VietsovPetro (VSP) technical requirements for water isolation materials.
A New Sterol from the Soft Coral Lobophytum crassum
Nguyen, Phuong Thao,Nguyen, Hoai Nam,Nguyen, Xuan Cuong,Nguyen, Xuan Nhiem,Pham, The Tung,Tran, Hong Quang,Nguyen, Thi Thanh Ngan,Phan, Van Kiem,Chau, Van Minh,Kim, Young Ho Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.1
An Adaptive Backstepping Trajectory Tracking Control of a Tractor Trailer Wheeled Mobile Robot
NGUYEN THANH BINH,Nguyen Anh Tung,Dao Phuong Nam,Nguyen Hong Quang 제어·로봇·시스템학회 2019 International Journal of Control, Automation, and Vol.17 No.2
The considered Tractor Trailer Wheeled Mobile Robot (TTWMR) is type of Mobile Robot including amaster robot – Tractor and slave robots – Trailers which moves along Tractor to track a given desired trajectory. Themain difficulties of the stabilization and the tracking control of TTWMR are due to nonlinear and underactuatedsystems subjected to nonholonomic constraints. In order to overcome these problems, firstly, we develop the modelof TTWMR and transform the tracking error model to the triangular form to propose a control law and an adaptivelaw. Secondly, the varying time state feedback controllers are designed to generate actuator torques by usingBackstepping technique and Lyapunov direct’s method, in that these are able to guarantee the stability of the wholesystem including kinematics and dynamics. In addition, the Babarlat’s lemma is used to prove that the proposedtracking errors converge to the origin and the proposed adaptive law is carried on to tackle unknown parameterproblem. The simulations are implemented to demonstrate the effective performances of the proposed adaptive lawand the proposed control law.
Le-Phuc Nguyen,Yen Thi Hai Pham,Phuong Thuy Ngo,Tri Van Tran,Loc Vinh Tran,Nam Thi Hoai Le,Luong Huu Nguyen,Tung Thanh Dang,Duc Anh Nguyen,Marco Wenzel,David Hartmann,Karsten Gloe,Jan J. Weigand,Klaus 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.5
Acid leaching and a two-step solvent extraction procedure were developed to produce high purity mixture of La and Ce from iron-rich spent FCC catalyst discharged from Dzung Quat refinery (Vietnam). Acid leaching of the spent catalyst with 2M HNO3 and a solid-to-liquid ratio of 1/3 at 80 oC in 1 h dissolved almost 90% of La while 12% of Al and 25% of Fe were transferred to the leachate. The extraction of RE metals and main impurities such as Al and Fe by a mixture of di-2-ethylhexyl phosphoric acid (D2EHPA) and tributyl phosphate (TBP) was investigated. Experiments showed that it was necessary to remove Fe before extracting RE and the optimum extraction conditions for a high recovery of RE while 0% of Al extraction were pH1, contact time=10min, and D2EHPA/TBP volume ratio= 4 : 1. At these conditions, the extraction yields of La(III) and Ce(III) were 72% and 89%, respectively. A two-step solvent extraction was developed to achieve a high purity of RE mixture, which included (1) the removal of impurity Fe by 25% (v/v) diisooctyl phosphinic acid (DiOPA) in n-octane for 140 min, (2) the extraction of rare earths by a mixture of di-2-ethylhexyl phosphoric acid (D2EHPA) and tributyl phosphate (TBP) in n-octane for 10 min without the need for adjusting the pH of the leaching solution.
Phuong T.M. Ha,Binh T.T. Le,Trung C. To,Son H. Doan,Tung T. Nguyen,Nam T.S. Phan 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.54 No.-
Iron-organic framework Fe3O(BPDC)3 was synthesized, and subsequently utilized as an productive heterogeneous catalyst for the cyclization reaction of N,N-dialkylanilines with ketoxime carboxylates to produce aryl-substituted pyridines. This iron-organic framework catalyst demonstrated remarkably higher catalytic productivity for the synthesis of aryl-substituted pyridines as compared to numerous conventional homogeneous catalysts as well as MOF-based catalysts. It was possible to reuse the iron- framework catalyst in the cyclization transformation for numerous cycles without a noticeable decline in activity. To our best knowledge, this is the first heterogeneous catalytic approach towards the synthesis of aryl-substituted pyridines from ketoximes.
Adaptive Control of a Flexible Varying-length Beam with a Translating Base in the 3D Space
Phuong-Tung Pham,Quoc Chi Nguyen,Junghan Kwon,Keum-Shik Hong 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.3
This paper investigates a control scheme for a variable-length beam attached to a translating base under an unknown boundary disturbance. The axial beam motion is assumed pre-defined. A hybrid system consisting of a gantry, a trolley, and an expandible cantilever beam attached to the trolley is considered. Two control forces are applied to the trolley and the gantry, respectively, to position them and suppress the vibration of the beam. According to Hamilton’s principle, a nonlinear mathematical model is developed describing the dynamics of the transverse and lateral oscillations of the beam, trolley, and gantry. Based on this dynamic model, a robust adaptive control law is developed to handle the closed-loop stability of the axially moving system with unknown disturbances. Stability analysis using the Lyapunov method proves that the closed-loop system under the proposed control law is uniformly ultimately bounded. Finally, numerical simulations verify the proposed control laws’ effectiveness.
Control of a Non-uniform Flexible Beam: Identification of First Two Modes
Phuong-Tung Pham,Gyoung-Hahn Kim,Quoc Chi Nguyen,Keum-Shik Hong 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.11
This paper presents an experimental study implementing the input shaping control of the first two modes of the vibration of a non-uniform flexible cantilever beam having a translating base. Examples of a moving cantilever beam appear in many industrial systems. Vibration suppression of the beam has important implications for improving the effectiveness of such systems. The equations of motion of the cantilever beam, including the moving base, are developed using the extended Hamilton principle. The partial differential equation representing the beam’s dynamics is then transformed into a finite-dimensional model using the Galerkin method. Accordingly, the modal parameter identification procedure is established based on experimental modal analysis. Under the estimated modal parameters, including the natural frequency and damping ratio, single- and two-mode input shaping controllers of three different types (zero vibration, zero vibration derivative, and zero vibration derivative-derivative) are designed for vibration suppression of the beam. Experimental results are discussed, reporting that the two-mode shaper’s vibration suppression was superior to the single-mode shaper. In contrast, the two-mode shaper’s settling time has slightly increased compared to that of the single-mode shaper.
김경한,Phuong-Tung Pham,Quang Hieu Ngo,Quoc Chi Nguyen 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.5
In this paper, a neural network-based robust anti-sway control is proposed for a crane system transporting an underwater object. A dynamic model of the crane system is developed by incorporating hoisting dynamics, hydrodynamic forces, and external disturbances. Considering the various uncertain factors that interfere with accuratepayload positioning in water, neural networks are designed to compensate for unknown parameters and unmodeleddynamics in the formulated problem. The neural network-based estimators are embedded in the anti-sway controlalgorithm, which improves the control performance against uncertainties. A sliding mode control with an exponential reaching law is developed to suppress the sway motions during underwater transportation. The asymptoticstability of the sliding manifold is proved via Lyapunov analysis. The embedded estimator prevents the conservativegain selection of the sliding mode control, thus reducing the chattering phenomena. Simulation results are providedto verify the effectiveness and robustness of the proposed control method.