Ice nucleation and accretion on structural surfaces are sources of major safety and operational concerns in many industries including aviation and renewable energy.Common methods for tackling these are active ones suc...Ice nucleation and accretion on structural surfaces are sources of major safety and operational concerns in many industries including aviation and renewable energy.Common methods for tackling these are active ones such as heating,ultrasound,and chemicals or passive ones such as surface coatings.In this study,we explored the ice adhesion properties of slippery coated substrates by measuring the shear forces required to remove a glaze ice block on the coated substrates.Among the studied nanostructured and nanoscale surfaces[i.e.,a superhydrophobic coating,a fluoropolymer coating,and a polydimethylsiloxane(PDMS)chain coating],the slippery omniphobic covalently attached liquid(SOCAL)surface with its flexible polymer brushes and liquid-like structure significantly reduced the ice adhesion on both glass and silicon surfaces.Further studies of the SOCAL coating on roughened substrates also demonstrated its low ice adhesion.The reduction in ice adhesion is attributed to the flexible nature of the brush-like structures of PDMS chains,allowing ice to detach easily.展开更多
This paper develops a real-time PV arrays maximum power harvesting scheme under partial shading condition(PSC)by reconfiguring PV arrays using Aquila optimizer(AO).AO is based on the natural behaviors of Aquila in cap...This paper develops a real-time PV arrays maximum power harvesting scheme under partial shading condition(PSC)by reconfiguring PV arrays using Aquila optimizer(AO).AO is based on the natural behaviors of Aquila in capturing prey,which can choose the best hunting mechanism ingeniously and quickly by balancing the local exploitation and global exploration via four hunting methods of Aquila:choosing the searching area through high soar with the vertical stoop,exploring in different searching spaces through contour flight with quick glide attack,exploiting in convergence searching space through low flight with slow attack,and swooping through walk and grabbing prey.In general,PV arrays reconfiguration is a problem of discrete optimization,thus a series of discrete operations are adopted in AO to enhance its optimization performance.Simulation results based on 10 cases under PSCs show that the mismatched power loss obtained by AO is the smallest compared with genetic algorithm,particle swarm optimization,ant colony algorithm,grasshopper optimization algorithm,and butterfly optimization algorithm,which reduced by 4.34%against butterfly optimization algorithm.展开更多
The morphologies of CuO/CeO_(2)-ZrO_(2) catalysts were successfully controlled by simply changing the synthesis temperature using hydrothermal method.The catalytic performance for toluene oxidation was correlated with...The morphologies of CuO/CeO_(2)-ZrO_(2) catalysts were successfully controlled by simply changing the synthesis temperature using hydrothermal method.The catalytic performance for toluene oxidation was correlated with the characterization results of HRTEM,BET,XRD,H2-TPR,Raman,and O_(2)-TPD.It was found that toluene can be oxidized into CO_(2) and H2O completely over the obtained catalysts,and the rod-like Cu/Ce-Zr-100 exhibits the best activity and CO_(2) selectivity.The rod-like CeO_(2)-ZrO_(2) supports preferentially exposes(110)and(100)crystal planes of CeO_(2),which provides more oxygen vacancies and stronger interaction between CuO and the support in Cu/Ce-Zr-100.And the strong synergetic effect in Cu/Ce-Zr-100 promotes the dispersion of CuO on the support surface,leading to the enhancement of reducibility,oxygen vacancy concentration,adsorption and activation of gaseous oxygen,which are responsible for the good catalytic performance of toluene oxidation.展开更多
基金supported by the Engineering and Physical Sciences Research Council(EPSRC)of the U.K.(Grant No.EP/P018998/1)the Acoustofluidics Special Interest Group of the UK Fluids Network(Grant No.EP/N032861/1)the EPSRC Centre for Doctoral Training in Renewable Energy Northeast Universities(ReNU)(Grant No.EP/S023836/1).
文摘Ice nucleation and accretion on structural surfaces are sources of major safety and operational concerns in many industries including aviation and renewable energy.Common methods for tackling these are active ones such as heating,ultrasound,and chemicals or passive ones such as surface coatings.In this study,we explored the ice adhesion properties of slippery coated substrates by measuring the shear forces required to remove a glaze ice block on the coated substrates.Among the studied nanostructured and nanoscale surfaces[i.e.,a superhydrophobic coating,a fluoropolymer coating,and a polydimethylsiloxane(PDMS)chain coating],the slippery omniphobic covalently attached liquid(SOCAL)surface with its flexible polymer brushes and liquid-like structure significantly reduced the ice adhesion on both glass and silicon surfaces.Further studies of the SOCAL coating on roughened substrates also demonstrated its low ice adhesion.The reduction in ice adhesion is attributed to the flexible nature of the brush-like structures of PDMS chains,allowing ice to detach easily.
基金supported by the Scientific Research Projects of Inner Mongolia Power(Group)Co.,Ltd.(Internal Electric Technology(2021)No.3).
文摘This paper develops a real-time PV arrays maximum power harvesting scheme under partial shading condition(PSC)by reconfiguring PV arrays using Aquila optimizer(AO).AO is based on the natural behaviors of Aquila in capturing prey,which can choose the best hunting mechanism ingeniously and quickly by balancing the local exploitation and global exploration via four hunting methods of Aquila:choosing the searching area through high soar with the vertical stoop,exploring in different searching spaces through contour flight with quick glide attack,exploiting in convergence searching space through low flight with slow attack,and swooping through walk and grabbing prey.In general,PV arrays reconfiguration is a problem of discrete optimization,thus a series of discrete operations are adopted in AO to enhance its optimization performance.Simulation results based on 10 cases under PSCs show that the mismatched power loss obtained by AO is the smallest compared with genetic algorithm,particle swarm optimization,ant colony algorithm,grasshopper optimization algorithm,and butterfly optimization algorithm,which reduced by 4.34%against butterfly optimization algorithm.
基金the financial support from the National Natural Science Foundation of China(No 51776216)the Postdoctoral Science Foundation of China(No.2017 M623284).
文摘The morphologies of CuO/CeO_(2)-ZrO_(2) catalysts were successfully controlled by simply changing the synthesis temperature using hydrothermal method.The catalytic performance for toluene oxidation was correlated with the characterization results of HRTEM,BET,XRD,H2-TPR,Raman,and O_(2)-TPD.It was found that toluene can be oxidized into CO_(2) and H2O completely over the obtained catalysts,and the rod-like Cu/Ce-Zr-100 exhibits the best activity and CO_(2) selectivity.The rod-like CeO_(2)-ZrO_(2) supports preferentially exposes(110)and(100)crystal planes of CeO_(2),which provides more oxygen vacancies and stronger interaction between CuO and the support in Cu/Ce-Zr-100.And the strong synergetic effect in Cu/Ce-Zr-100 promotes the dispersion of CuO on the support surface,leading to the enhancement of reducibility,oxygen vacancy concentration,adsorption and activation of gaseous oxygen,which are responsible for the good catalytic performance of toluene oxidation.
