Using the concept of optical transformation, we report on an amplifying device, which can make an arbitrary object enlarged. Its potential application to small object identification and detection is foreseeable. The c...Using the concept of optical transformation, we report on an amplifying device, which can make an arbitrary object enlarged. Its potential application to small object identification and detection is foreseeable. The cylindrical anisotropic amplifying shell could be mimicked by radially symmetrical ＂sectors＂ alternating in composition between two profiles of isotropic dielectrics; the permittivity and permeability in each ＂sector＂ can be properly determined by the effective medium theory. Both the magnetic and nonmagnetic amplifying devices are validated by full-wave finite element simulations. Good amplifying performance is observed.展开更多
Based on the effective medium theory, the triangular ground plane cloak can be realized by thin layered systems. Two solutions of parameter setting of the layered cloak are suggested to demonstrate the invisibility pe...Based on the effective medium theory, the triangular ground plane cloak can be realized by thin layered systems. Two solutions of parameter setting of the layered cloak are suggested to demonstrate the invisibility performance of a hybrid incoming wave. The hybrid parameters are derived from the equivalent of both anisotropies of permittivity and permeability to the Mternating layers. The performance of the designed layered cloak is validated by both TM and TE wave simulations with near-field distributions and average scattering power outflows on an observation semicircle. From the simulation results, the layered cloak with both hybrid parameters and improved hybrid parameters can reflect the incoming TM/TE waves in a specular direction, and the latter behaves with a better overall invisibility performance.展开更多
This paper proposes bridging virtual reality(VR)and the humanities,creating a valuable outcome through the implementation of virtual realities in teaching environments and through the reflection on the narratives and ...This paper proposes bridging virtual reality(VR)and the humanities,creating a valuable outcome through the implementation of virtual realities in teaching environments and through the reflection on the narratives and content in the process of modelling in the humanities.Current state of the art technologies offer many people the opportunity to experience VR without having to purchase expensive devices.This results in a rapidly growing number of different content to explore,and a diversification of overall concepts.Looking at VR as a form of representation and as a means of reproducing narratives,many potential research questions also for the(digital)humanities arise.This includes observing,exploring and comprehending the modelling of virtual worlds.It is of key importance to consider the process of creation,which is a process of modelling done by different individuals with different disciplinary backgrounds.Several courses at the University of Cologne were offered in which virtual worlds for the narration of theatre plays as well as other narratives were modelled by the students.The experiences from these courses will be used to analyse critically the use of VR in the humanities.展开更多
基金Project supported by the Open Research Program in State Key Laboratory of Millimeter Waves,China (Grant No.K200802)the National Natural Science Foundation of China (Grant No.61302048)the Priority Academic Program Development of Jiangsu Provincial Higher Education Institutions,China
文摘Using the concept of optical transformation, we report on an amplifying device, which can make an arbitrary object enlarged. Its potential application to small object identification and detection is foreseeable. The cylindrical anisotropic amplifying shell could be mimicked by radially symmetrical ＂sectors＂ alternating in composition between two profiles of isotropic dielectrics; the permittivity and permeability in each ＂sector＂ can be properly determined by the effective medium theory. Both the magnetic and nonmagnetic amplifying devices are validated by full-wave finite element simulations. Good amplifying performance is observed.
基金supported partly by the Open Research Program in State Key Laboratory of Millimeter Waves of China (Grant No. K201103)partly by the National Natural Science Foundation of China (Grant No. 60971122)partly by the Natural Science Foundation of Jiangsu Province of China (Grant No. BK2011727)
文摘Based on the effective medium theory, the triangular ground plane cloak can be realized by thin layered systems. Two solutions of parameter setting of the layered cloak are suggested to demonstrate the invisibility performance of a hybrid incoming wave. The hybrid parameters are derived from the equivalent of both anisotropies of permittivity and permeability to the Mternating layers. The performance of the designed layered cloak is validated by both TM and TE wave simulations with near-field distributions and average scattering power outflows on an observation semicircle. From the simulation results, the layered cloak with both hybrid parameters and improved hybrid parameters can reflect the incoming TM/TE waves in a specular direction, and the latter behaves with a better overall invisibility performance.
文摘This paper proposes bridging virtual reality(VR)and the humanities,creating a valuable outcome through the implementation of virtual realities in teaching environments and through the reflection on the narratives and content in the process of modelling in the humanities.Current state of the art technologies offer many people the opportunity to experience VR without having to purchase expensive devices.This results in a rapidly growing number of different content to explore,and a diversification of overall concepts.Looking at VR as a form of representation and as a means of reproducing narratives,many potential research questions also for the(digital)humanities arise.This includes observing,exploring and comprehending the modelling of virtual worlds.It is of key importance to consider the process of creation,which is a process of modelling done by different individuals with different disciplinary backgrounds.Several courses at the University of Cologne were offered in which virtual worlds for the narration of theatre plays as well as other narratives were modelled by the students.The experiences from these courses will be used to analyse critically the use of VR in the humanities.
