空间引力波探测中,级联积分梳状(CIC)抗混叠滤波器被用于相位计的抗混叠降采样。而CIC滤波器通带不平坦,意味着不同频率下的衰减不同。因此,在需要对相位真值高精度测量的领域,传统的降采样方法并不适用。近期,中国科学院力学研究所团...空间引力波探测中,级联积分梳状(CIC)抗混叠滤波器被用于相位计的抗混叠降采样。而CIC滤波器通带不平坦,意味着不同频率下的衰减不同。因此,在需要对相位真值高精度测量的领域,传统的降采样方法并不适用。近期,中国科学院力学研究所团队采用基于CIC插值二阶多项式(ISOP)架构的滤波器,用于补偿衰减效应。相关研究成果以Optimization Design of Decimation Filter for the Phasemeter in the Space Gravitational Wave Detection为题,发表在IEEE Transactions on Instrumentation and Measurement上。展开更多
In recent years,researchers have investigated the evaporation of Schwarzschild black holes using various forms of the generalized uncertainty principle(GUP),metric quantum correction,and noncommutative geometry,respec...In recent years,researchers have investigated the evaporation of Schwarzschild black holes using various forms of the generalized uncertainty principle(GUP),metric quantum correction,and noncommutative geometry,respectively.However,there are differences between the GUP correction and the other two methods in terms of describing the later stages of black hole evaporation.Furthermore,some studies argue that the GUP with a negative parameter cannot effectively correct black hole evaporation,while others contend that the positivity or negativity of the GUP parameters should not affect the correction results.Taking the above into consideration,we reconsider black hole evaporation with the generalized uncertainty principle including a linear term(LGUP),and examine the case of negative parameters.The results indicate that the evaporation behavior of both Schwarzschild black holes and Reissner–Nordstr?m black holes,under LGUP correction,is consistent with the results of metric quantum correction and non-commutative geometry.Additionally,the negative parameter LGUP can also effectively correct for black hole evaporation.展开更多
We construct an integrable 1D extended Hubbard model within the framework of the quantum inverse scattering method.With the help of the nested algebraic Bethe ansatz method,the eigenvalue Hamiltonian problem is solved...We construct an integrable 1D extended Hubbard model within the framework of the quantum inverse scattering method.With the help of the nested algebraic Bethe ansatz method,the eigenvalue Hamiltonian problem is solved by a set of Bethe ansatz equations,whose solutions are supposed to give the correct energy spectrum.展开更多
The microscopic global nucleon–nucleus optical model potential(OMP)proposed by Whitehead,Lim,and Holt,the WLH potential(Whitehead et al.,Phys Rev Lett 127:182502,2021),which was constructed in the framework of many-b...The microscopic global nucleon–nucleus optical model potential(OMP)proposed by Whitehead,Lim,and Holt,the WLH potential(Whitehead et al.,Phys Rev Lett 127:182502,2021),which was constructed in the framework of many-body per-turbation theory with state-of-the-art nuclear interactions from chiral effective field theory(EFT),was tested with(p,d)transfer reactions calculated using adiabatic wave approximation.The target nuclei included both stable and unstable nuclei,and the incident energies reached 200 MeV.The results were compared with experimental data and predictions using the phenomenological global optical potential of Koning and Delaroche,the KD02 potential.Overall,we found that the micro-scopic WLH potential described the(p,d)reaction angular distributions similarly to the phenomenological KD02 potential;however,the former was slightly better than the latter for radioactive targets.On average,the obtained spectroscopic factors(SFs)using both microscopic and phenomenological potentials were similar when the incident energies were below approxi-mately 120 MeV.However,their difference tended to increase at higher incident energies,which was particularly apparent for the doubly magic target nucleus 40Ca.展开更多
文摘空间引力波探测中,级联积分梳状(CIC)抗混叠滤波器被用于相位计的抗混叠降采样。而CIC滤波器通带不平坦,意味着不同频率下的衰减不同。因此,在需要对相位真值高精度测量的领域,传统的降采样方法并不适用。近期,中国科学院力学研究所团队采用基于CIC插值二阶多项式(ISOP)架构的滤波器,用于补偿衰减效应。相关研究成果以Optimization Design of Decimation Filter for the Phasemeter in the Space Gravitational Wave Detection为题,发表在IEEE Transactions on Instrumentation and Measurement上。
基金supported by the National Natural Science Foundation of China(Grant No.12265007)。
文摘In recent years,researchers have investigated the evaporation of Schwarzschild black holes using various forms of the generalized uncertainty principle(GUP),metric quantum correction,and noncommutative geometry,respectively.However,there are differences between the GUP correction and the other two methods in terms of describing the later stages of black hole evaporation.Furthermore,some studies argue that the GUP with a negative parameter cannot effectively correct black hole evaporation,while others contend that the positivity or negativity of the GUP parameters should not affect the correction results.Taking the above into consideration,we reconsider black hole evaporation with the generalized uncertainty principle including a linear term(LGUP),and examine the case of negative parameters.The results indicate that the evaporation behavior of both Schwarzschild black holes and Reissner–Nordstr?m black holes,under LGUP correction,is consistent with the results of metric quantum correction and non-commutative geometry.Additionally,the negative parameter LGUP can also effectively correct for black hole evaporation.
基金Financial support from the National Natural Science Foundation of China(Grant Nos.12105221,12175180,12074410,12047502,11934015,11975183,11947301,11775177,11775178 and 11774397)the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDB33000000)+4 种基金the Shaanxi Fundamental Science Research Project for Mathematics and Physics(Grant No.22JSZ005)the Major Basic Research Program of Natural Science of Shaanxi Province(Grant Nos.2021JCW-19,2017KCT-12 and 2017ZDJC-32)the Scientific Research Program Funded by the Shaanxi Provincial Education Department(Grant No.21JK0946)the Beijing National Laboratory for Condensed Matter Physics(Grant No.202162100001)the Double First-Class University Construction Project of Northwest University is gratefully acknowledged.
文摘We construct an integrable 1D extended Hubbard model within the framework of the quantum inverse scattering method.With the help of the nested algebraic Bethe ansatz method,the eigenvalue Hamiltonian problem is solved by a set of Bethe ansatz equations,whose solutions are supposed to give the correct energy spectrum.
基金Supported by National Natural Science Foundation of China(Nos.U2067205 and 12205098)National Key Laboratory of Computational Physics(HX02021-35).
文摘The microscopic global nucleon–nucleus optical model potential(OMP)proposed by Whitehead,Lim,and Holt,the WLH potential(Whitehead et al.,Phys Rev Lett 127:182502,2021),which was constructed in the framework of many-body per-turbation theory with state-of-the-art nuclear interactions from chiral effective field theory(EFT),was tested with(p,d)transfer reactions calculated using adiabatic wave approximation.The target nuclei included both stable and unstable nuclei,and the incident energies reached 200 MeV.The results were compared with experimental data and predictions using the phenomenological global optical potential of Koning and Delaroche,the KD02 potential.Overall,we found that the micro-scopic WLH potential described the(p,d)reaction angular distributions similarly to the phenomenological KD02 potential;however,the former was slightly better than the latter for radioactive targets.On average,the obtained spectroscopic factors(SFs)using both microscopic and phenomenological potentials were similar when the incident energies were below approxi-mately 120 MeV.However,their difference tended to increase at higher incident energies,which was particularly apparent for the doubly magic target nucleus 40Ca.
文摘文中指出权威英文词典在物理场定义上的误导并加以澄清。《朗文现代高级词典》(Longman ModernEnglish Dictionary),《朗文当代高级词典》(Longman Dictionary of Contemporary English),《牛津高阶英汉双解词典》(Oxford Advanced Learner s English-Chinese Dictionary),《韦氏词典》(Merriam-Webster s NewCollegiate Dictionary),作为美国勘探地球物理学会(SEG)名词术语,特别是地球物理名词术语标准的《勘探地球物理百科词典》(Encyclopedic Dictionary of Exploration Geophysics)和《应用地球物理百科词典》(TheEncyclopedic Dictionary of Applied Geophysics),以及中国的一些地球物理教科书、专著及词典,把物理场定义为物理作用或效应存在的空间或区域,不同于物理学中场论及国外地球物理文献的定义:空间中存在的作用或效应。定义物理场为物理作用或效应存在的空间,混淆了物理"场"本身及"场域"的概念,不是一个标准的物理学定义。建议物理场定义为:空间中存在的物理作用。
