Excess molar volume(V E) data on binary liquid mixtures of methylheptenone (MHO) with methanol, ethanol, n-propanol or n-butanol have been determined from the density measurements at 298.15 K and atmospheric pressure...Excess molar volume(V E) data on binary liquid mixtures of methylheptenone (MHO) with methanol, ethanol, n-propanol or n-butanol have been determined from the density measurements at 298.15 K and atmospheric pressure. The values of V E in all the systems over the entire composition range are quantified by the Redlich-Kister equation. The effects of the chain length of alkanols on V E are discussed.展开更多
Based on the concept of a grating-coupled waveguide(GCW),a new strategy for realizing EM cloaking is presented.Using metallic grating,incident waves are firstly coupled into the effective waveguide and then decoupled ...Based on the concept of a grating-coupled waveguide(GCW),a new strategy for realizing EM cloaking is presented.Using metallic grating,incident waves are firstly coupled into the effective waveguide and then decoupled into free space behind,enabling EM waves to pass around the obstacle.Phase compensation in the waveguide keeps the wave-front shape behind the obstacle unchanged.Circular,rectangular and triangular cloaks are presented to verify the robustness of the GCW cloaking.Electric field animations and radar cross section(RCS)comparisons convincingly demonstrate the cloaking effect.展开更多
基金Supported by the National Natural Science Foundation of China( No.2 99760 3 5 ) and the Zhejiang Provincial NatioralScience Foundation of China( No.2 990 3 5 )
文摘Excess molar volume(V E) data on binary liquid mixtures of methylheptenone (MHO) with methanol, ethanol, n-propanol or n-butanol have been determined from the density measurements at 298.15 K and atmospheric pressure. The values of V E in all the systems over the entire composition range are quantified by the Redlich-Kister equation. The effects of the chain length of alkanols on V E are discussed.
基金Supported by the Natural Science Foundation of Shaanxi Province under Grants No 2011JQ8031the National Basic Research Program of China under Grant No 2009CB613306.
文摘Based on the concept of a grating-coupled waveguide(GCW),a new strategy for realizing EM cloaking is presented.Using metallic grating,incident waves are firstly coupled into the effective waveguide and then decoupled into free space behind,enabling EM waves to pass around the obstacle.Phase compensation in the waveguide keeps the wave-front shape behind the obstacle unchanged.Circular,rectangular and triangular cloaks are presented to verify the robustness of the GCW cloaking.Electric field animations and radar cross section(RCS)comparisons convincingly demonstrate the cloaking effect.
