The research of target tracking mainly focuses on one-to-one and many-to-one tracking, and occasionally on many-to-many tasks. Compared with single target tracking, multiple target tracking has broader application pro...
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For (1-x)Na0.5Bi0.5TiO3-xBaTiO3 (NBT-BT) ceramics, the highest piezoelectric performances appears at morphotropic phase boundary (x=0.06∼0.10). Recently, quenching has been as an effective way to improve their piezoe...
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Anaerobic ammonium oxidation (anammox) is an energy-efficient technology for wastewater nitrogen removal. However, the byproduct nitrate has hindered development and application of anammox process. Meanwhile, the know...
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In recent years, nanoparticles have become the most potential enhanced oil recovery technology due to their unique small size effect and specific surface area effect. With the research and application of graphene and ...
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In recent years, nanoparticles have become the most potential enhanced oil recovery technology due to their unique small size effect and specific surface area effect. With the research and application of graphene and its derived materials, nanosheets are the research hotspot of nanomaterials for enhanced surfactant flooding, but there is no report on the molecular simulation comparison of nanoparticles and nanosheets to enhance surfactant performance. Therefore, in this paper, we first constructed nano-SiO2 particles grafted with hydroxyl and pentyl alkane activator, graphene nanosheets grafted with carboxylic acid chain and pentyl alkane activator. On this basis, the interfacial tension, interfacial density, interfacial generation energy and radial distribution function were analyzed by molecular dynamics simulation. The results showed that both nanoparticles and nanosheets could produce synergistic effect with amphoteric surfactant dodecyl dimethylaminoethyllactone (BS-12), and the synergistic effect of nanosheets with BS-12 was stronger after carboxylic acid chain and pentyl alkane activator were grafted on the surface of nanosheets. The interfacial tension of n-dodecane/water can be reduced to 13.58 mN/m by the combination of modified nanoparticles and BS-12, while the interfacial tension of n-dodecane/water can be reduced to 4.15 mN/m by the combination of modified nanosheets and BS-12, which means that the ability of reducing oil-water interfacial tension is significantly improved. Second, the calculation of n-dodecane/water interface thickness and interface formation energy showed that compared with the modified nanoparticles and BS-12 compound system, the interface thickness of the modified nanoparticles and BS-12 compound system increased by 9.24%, and the interface formation energy increased by 17.85%. In addition, the results of radial distribution function analysis also showed that the modified nanosheets had strong hydration with water molecules after c
This paper introduces an anti-interference robust control strategy for underactuated quadrotor *** strategy consists of an extended state observer and a sliding mode controller. A high gain extended observer was desig...
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ISBN:
(纸本)9781467374439
This paper introduces an anti-interference robust control strategy for underactuated quadrotor *** strategy consists of an extended state observer and a sliding mode controller. A high gain extended observer was designed to solve the problem of the low measurement accuracy of derivative of the state in real quadrotor UAV *** oberver can estimate derivative of a given signal with a high accuracy,so it can reduce the hardware requirements in real system, the observer is also used to evaluate the outside disturbance.A sliding mode controller was designed for the underactuated quadrotor UAV, and then set the estimation of disturbance as a part of the control signal, in this way the outside disturbance can be suppressed. Thus the anti-interference ability of the system was *** results verify the effectiveness of the proposed algorithm.
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