How to generate pictures real and esthetic objects is an important subject of computer graphics. The techniques of mapping textures onto the surfaces of an object in the 3D space are efficient ap- proaches for the pur...How to generate pictures real and esthetic objects is an important subject of computer graphics. The techniques of mapping textures onto the surfaces of an object in the 3D space are efficient ap- proaches for the purpose.We developed and implemented algorithms for generating objects with appear ances stone,wood grain,ice lattice,brick,doors and windows on Apollo workstations. All the algorithms have been incorporated into the 3D geometry modelling system(GEMS)developed by the CAD Center of Tsinghua University.This paper emphasizes the wood grain and the ice lattice algorithms.展开更多
Although the Filtered-X LMS (FLMS) algorithm is widely used in the Adaptive Active Noise Control (AANC) system due to its simplicity, its applications to an AANC are limited because it is intensively sensitive to the ...Although the Filtered-X LMS (FLMS) algorithm is widely used in the Adaptive Active Noise Control (AANC) system due to its simplicity, its applications to an AANC are limited because it is intensively sensitive to the dispersion of the eigenvalues of the autocorrelation matrix of the input signal vector. The Filtered-X Momentum LMS (FMLMS) algorithm proposed in this paper includes a momentum term to weight update equation of the FLMS algorithm. From the theoretical analysis, the computer simulations and the experimental resultsin a half-anechoic room, it is shown that the FMLMS algorithm has more advantages than the FLMS algorithm for a single-path AANC system.展开更多
Space-borne gravitational wave(GW)detectors can detect the merger of massive black holes.The early warning and localization of GW events before merging can be used to inform electromagnetic telescopes and conduct mult...Space-borne gravitational wave(GW)detectors can detect the merger of massive black holes.The early warning and localization of GW events before merging can be used to inform electromagnetic telescopes and conduct multimessenger observations.However,this requires real-time data transmission and analysis capabilities.The geocentric orbit of the space-borne GW detector Tian Qin makes it possible to conduct real-time data transmission.In this study,we develop a search and localization pipeline for massive black hole binaries(MBHBs)with Tian Qin under both regular and real-time data transmission modes.We demonstrate that,with real-time data transmission,MBHBs can be accurately localized on the fly.With the approaching merger,each analysis can be finished in only 40 min.For an MBHB system at a distance of 1 Gpc,if we receive data every hour,then we can pinpoint its location to within less than 1 deg^(2)on the final day before the merger.展开更多
文摘How to generate pictures real and esthetic objects is an important subject of computer graphics. The techniques of mapping textures onto the surfaces of an object in the 3D space are efficient ap- proaches for the purpose.We developed and implemented algorithms for generating objects with appear ances stone,wood grain,ice lattice,brick,doors and windows on Apollo workstations. All the algorithms have been incorporated into the 3D geometry modelling system(GEMS)developed by the CAD Center of Tsinghua University.This paper emphasizes the wood grain and the ice lattice algorithms.
文摘Although the Filtered-X LMS (FLMS) algorithm is widely used in the Adaptive Active Noise Control (AANC) system due to its simplicity, its applications to an AANC are limited because it is intensively sensitive to the dispersion of the eigenvalues of the autocorrelation matrix of the input signal vector. The Filtered-X Momentum LMS (FMLMS) algorithm proposed in this paper includes a momentum term to weight update equation of the FLMS algorithm. From the theoretical analysis, the computer simulations and the experimental resultsin a half-anechoic room, it is shown that the FMLMS algorithm has more advantages than the FLMS algorithm for a single-path AANC system.
基金supported by the Guangdong Major Project of Basic and Applied Basic Research(Grant No.2019B030302001)and the National Natural Science Foundation of China(Grant Nos.12173104,and 12261131504)。
文摘Space-borne gravitational wave(GW)detectors can detect the merger of massive black holes.The early warning and localization of GW events before merging can be used to inform electromagnetic telescopes and conduct multimessenger observations.However,this requires real-time data transmission and analysis capabilities.The geocentric orbit of the space-borne GW detector Tian Qin makes it possible to conduct real-time data transmission.In this study,we develop a search and localization pipeline for massive black hole binaries(MBHBs)with Tian Qin under both regular and real-time data transmission modes.We demonstrate that,with real-time data transmission,MBHBs can be accurately localized on the fly.With the approaching merger,each analysis can be finished in only 40 min.For an MBHB system at a distance of 1 Gpc,if we receive data every hour,then we can pinpoint its location to within less than 1 deg^(2)on the final day before the merger.
