本文设计了由不对称半圆柱对阵列组成的全介质超构表面,获得了两个高品质因子的准连续域束缚态模式(quasi-bound states in the continuum,QBIC).通过选择不同形式的对称破缺,在近红外频段均可产生两个稳健的QBIC,并且二者的谐振波长、...本文设计了由不对称半圆柱对阵列组成的全介质超构表面,获得了两个高品质因子的准连续域束缚态模式(quasi-bound states in the continuum,QBIC).通过选择不同形式的对称破缺,在近红外频段均可产生两个稳健的QBIC,并且二者的谐振波长、品质因子、偏振依赖等表现出不同的特性.模拟计算表明,通过测量两个QBIC的谐振波长,能够实现折射率和温度的双参数传感;通过调节不对称参数,利用QBIC的品质因子依赖于不对称参数的二次方反比关系,理论上能够提高品质因子到任意的数值,从而实现传感性能的提升和调节.该超构表面的折射率传感灵敏度、品质因子和优值分别达到194.7 nm/RIU,45829和8197,其温度传感灵敏度达到24 pm/℃.展开更多
本文设计了由四聚长方体组成的全介质超表面,其中每个长方体刻蚀两个椭圆柱并填装空气.当分别为超表面单独引入面内对称破缺、位移扰动和周期扰动时,可在近红外波段产生稳健的准连续域束缚态模式(quasi-bound states in the continuum)...本文设计了由四聚长方体组成的全介质超表面,其中每个长方体刻蚀两个椭圆柱并填装空气.当分别为超表面单独引入面内对称破缺、位移扰动和周期扰动时,可在近红外波段产生稳健的准连续域束缚态模式(quasi-bound states in the continuum).通过测量准BIC (quasi-BIC)模式的谐振波长,计算准BIC模式的Q因子(quality fector)与不对称参数的关系,可进一步证实不对称参数对准BIC共振频率和Q因子的可调谐性.在此基础上,当同时引入面内对称破缺、位移扰动和周期扰动时,可获得5个高Q因子的准BIC模式.共振峰的数量、位置以及Q因子都可通过调整面内破缺、位移扰动和周期扰动的程度进行调控.该超表面的设计可为传感器的多参数传感以及灵敏度等性能的提升提供一种全新思路.展开更多
In this paper, we study the long-time behavior of solutions of the single-layer quasi-geostrophic model arising from geophysical fluid dynamics. We obtain the lower bound of the decay estimate of the solution. Utilizi...In this paper, we study the long-time behavior of solutions of the single-layer quasi-geostrophic model arising from geophysical fluid dynamics. We obtain the lower bound of the decay estimate of the solution. Utilizing the Fourier splitting method, under suitable assumptions on the initial data, for any multi-index α, we show that the solution Ψ satisfies .展开更多
An extended LCAC\|SW(Linear Combination of Arrangement Channels\|Scattering Wavefunction) quantum scattering dynamic method combined with \%ab initio\% quantum chemical calculations has been used to study the formatio...An extended LCAC\|SW(Linear Combination of Arrangement Channels\|Scattering Wavefunction) quantum scattering dynamic method combined with \%ab initio\% quantum chemical calculations has been used to study the formation mechanism of the resonance states for ion\|pair formation reaction Na+I\-2 Na\+++I\+-\-2. Resonance energy and width or lifetime for the first resonance peak were calculated. Resonance can be identified to Feshbach resonance and the physical interpretation was given.展开更多
针对基于接收信号强度指示(received signal strength index,RSSI)测距定位精度不高问题,提出基于测距修正和拟牛顿法节点定位(ranging correction and quasi-Newton method-based localization,RCNL)算法。RCNL算法由测距和定位两个阶...针对基于接收信号强度指示(received signal strength index,RSSI)测距定位精度不高问题,提出基于测距修正和拟牛顿法节点定位(ranging correction and quasi-Newton method-based localization,RCNL)算法。RCNL算法由测距和定位两个阶段组成。在测距阶段,RCNL算法先利用RSSI测距,再通过正态滤波剔除偏差大的RSSI值,进而提高测距精度;在定位阶段,先通过Bounding-box算法估计未知节点位置,再利用拟牛顿法进一步估计未知节点位置,提高定位精度。仿真结果表明,在节点数为100,通信半径为25 m环境下,相比IDV-hop算法,RCNL算法的归一化定位误差下降了约6%。展开更多
文摘本文设计了由不对称半圆柱对阵列组成的全介质超构表面,获得了两个高品质因子的准连续域束缚态模式(quasi-bound states in the continuum,QBIC).通过选择不同形式的对称破缺,在近红外频段均可产生两个稳健的QBIC,并且二者的谐振波长、品质因子、偏振依赖等表现出不同的特性.模拟计算表明,通过测量两个QBIC的谐振波长,能够实现折射率和温度的双参数传感;通过调节不对称参数,利用QBIC的品质因子依赖于不对称参数的二次方反比关系,理论上能够提高品质因子到任意的数值,从而实现传感性能的提升和调节.该超构表面的折射率传感灵敏度、品质因子和优值分别达到194.7 nm/RIU,45829和8197,其温度传感灵敏度达到24 pm/℃.
文摘本文设计了由四聚长方体组成的全介质超表面,其中每个长方体刻蚀两个椭圆柱并填装空气.当分别为超表面单独引入面内对称破缺、位移扰动和周期扰动时,可在近红外波段产生稳健的准连续域束缚态模式(quasi-bound states in the continuum).通过测量准BIC (quasi-BIC)模式的谐振波长,计算准BIC模式的Q因子(quality fector)与不对称参数的关系,可进一步证实不对称参数对准BIC共振频率和Q因子的可调谐性.在此基础上,当同时引入面内对称破缺、位移扰动和周期扰动时,可获得5个高Q因子的准BIC模式.共振峰的数量、位置以及Q因子都可通过调整面内破缺、位移扰动和周期扰动的程度进行调控.该超表面的设计可为传感器的多参数传感以及灵敏度等性能的提升提供一种全新思路.
文摘In this paper, we study the long-time behavior of solutions of the single-layer quasi-geostrophic model arising from geophysical fluid dynamics. We obtain the lower bound of the decay estimate of the solution. Utilizing the Fourier splitting method, under suitable assumptions on the initial data, for any multi-index α, we show that the solution Ψ satisfies .
文摘An extended LCAC\|SW(Linear Combination of Arrangement Channels\|Scattering Wavefunction) quantum scattering dynamic method combined with \%ab initio\% quantum chemical calculations has been used to study the formation mechanism of the resonance states for ion\|pair formation reaction Na+I\-2 Na\+++I\+-\-2. Resonance energy and width or lifetime for the first resonance peak were calculated. Resonance can be identified to Feshbach resonance and the physical interpretation was given.
文摘针对基于接收信号强度指示(received signal strength index,RSSI)测距定位精度不高问题,提出基于测距修正和拟牛顿法节点定位(ranging correction and quasi-Newton method-based localization,RCNL)算法。RCNL算法由测距和定位两个阶段组成。在测距阶段,RCNL算法先利用RSSI测距,再通过正态滤波剔除偏差大的RSSI值,进而提高测距精度;在定位阶段,先通过Bounding-box算法估计未知节点位置,再利用拟牛顿法进一步估计未知节点位置,提高定位精度。仿真结果表明,在节点数为100,通信半径为25 m环境下,相比IDV-hop算法,RCNL算法的归一化定位误差下降了约6%。
