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Design of a high sensitivity and wide range angular rate sensor based on exceptional surface
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作者 丁鑫圣 刘文耀 +7 位作者 王师贤 陶煜 周彦汝 白禹 刘来 邢恩博 唐军 刘俊 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第8期277-286,共10页
It is found that when the parity–time symmetry phenomenon is introduced into the resonant optical gyro system and it works near the exceptional point,the sensitivity can in theory be significantly amplified at low an... It is found that when the parity–time symmetry phenomenon is introduced into the resonant optical gyro system and it works near the exceptional point,the sensitivity can in theory be significantly amplified at low angular rate.However,in fact,the exceptional point is easily disturbed by external environmental variables,which means that it depends on harsh experimental environment and strong control ability,so it is difficult to move towards practical application.Here,we propose a new angular rate sensor structure based on exceptional surface,which has the advantages of high sensitivity and high robustness.The system consists of two fiber-optic ring resonators and two optical loop mirrors,and one of the resonators contains a variable ratio coupler and a variable optical attenuator.We theoretically analyze the system response,and the effects of phase and coupling ratio on the system response.Finally,compared with the conventional resonant gyro,the sensitivity of this exceptional surface angular rate sensor can be improved by about 300 times at low speed.In addition,by changing the loss coefficient in the ring resonator,we can achieve a wide range of 600 rad/s.This scheme provides a new approach for the development of ultra-high sensitivity and wide range angular rate sensors in the future. 展开更多
关键词 exceptional surface exceptional points ring resonator angular rate sensing rotational direction recognition wide operating range
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Exceptional points and quantum dynamics in a non-Hermitian two-qubit system
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作者 张益玺 张振涛 +2 位作者 杨震山 魏晓志 梁宝龙 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第6期212-218,共7页
We study the exceptional-point(EP) structure and the associated quantum dynamics in a system consisting of a non-Hermitian qubit and a Hermitian qubit. We find that the system possesses two sets of EPs, which divide t... We study the exceptional-point(EP) structure and the associated quantum dynamics in a system consisting of a non-Hermitian qubit and a Hermitian qubit. We find that the system possesses two sets of EPs, which divide the systemparameter space into PT-symmetry unbroken, partially broken and fully broken regimes, each with distinct quantumdynamics characteristics. Particularly, in the partially broken regime, while the PT-symmetry is generally broken in the whole four-dimensional Hilbert space, it is preserved in a two-dimensional subspace such that the quantum dynamics in the subspace are similar to those in the PT-symmetry unbroken regime. In addition, we reveal that the competition between the inter-qubit coupling and the intra-qubit driving gives rise to a complex pattern in the EP variation with system parameters. 展开更多
关键词 non-Hermitian system exceptional point PT-SYMMETRY
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Localization Dynamics at the Exceptional Point of Non-Hermitian Creutz Ladder
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作者 张舒迈 何天毅 金亮 《Chinese Physics Letters》 SCIE EI CAS CSCD 2024年第2期83-93,共11页
We propose a quasi-one-dimensional non-Hermitian Creutz ladder with an entirely flat spectrum by introducing alternating gain and loss components while maintaining inversion symmetry.Destructive interference generates... We propose a quasi-one-dimensional non-Hermitian Creutz ladder with an entirely flat spectrum by introducing alternating gain and loss components while maintaining inversion symmetry.Destructive interference generates a flat spectrum at the exceptional point,where the Creutz ladder maintains coalesced and degenerate eigenvalues with compact localized states distributed in a single plaquette.All excitations are completely confined within the localization area,unaffected by gain and loss.Single-site excitations exhibit nonunitary dynamics with intensities increasing due to level coalescence,while multiple-site excitations may display oscillating or constant intensities at the exceptional point.These results provide insights into the fascinating dynamics of non-Hermitian localization,where level coalescence and degeneracy coexist at the exceptional point. 展开更多
关键词 exceptional EXCITATION OSCILLATING
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On the“News Exception”in Personal Information Protection
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作者 张文亮 刘雨祺 LI Donglin 《The Journal of Human Rights》 2024年第1期89-110,共22页
Protection of personal information is a significant issue in the construction of legal systems in various countries in the information age.Introducing a balanced approach for protecting personal information is an impo... Protection of personal information is a significant issue in the construction of legal systems in various countries in the information age.Introducing a balanced approach for protecting personal information is an important goal of basic human rights protection and data legislation.Personal information protection involves comprehensive considerations among various values,and the balanced structure between personal information rights and other rights systems has become the key to legislation on personal information protection.The“news exception”is a prominent example representing the balanced structure of personal information protection.As a societal instrument,news not only pursues commercial value but also advocates freedom of expression and public value.There exists a natural tension between news and personal information protection.The“news exception”of the balanced structure has become a fundamental requirement and important connotation for constructing a system for protecting personal information.The balanced structure of the“news exception”requires a reasonable definition of the concept and purpose of news,and both the self-discipline within the news industry and the judicial intervention are necessary factors.China has preliminarily completed the top-level legislative design of personal information protection through laws such as the Civil Code of the People’s Republic of China(PRC)and the Personal Information Protection Law of the People’s Republic of China.However,the balanced mechanism of the“news exception”has not yet been fully established in China.A“news exception”based on the ideas of balance and the improvement of the institutional system is the fundamental principle for the development of China’s personal information protection system. 展开更多
关键词 personal information news exception Civil Code of the PRC
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Reconfigurable metamaterial for asymmetric and symmetric elastic wave absorption based on exceptional point in resonant bandgap 被引量:3
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作者 Jianlin YI Zheng WU +1 位作者 Rongyu XIA Zheng LI 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2023年第1期1-20,共20页
Elastic wave absorption at subwavelength scale is of significance in many engineering applications.Non-Hermitian metamaterials show the ability in high-efficiency wave absorption.However,the single functionality of me... Elastic wave absorption at subwavelength scale is of significance in many engineering applications.Non-Hermitian metamaterials show the ability in high-efficiency wave absorption.However,the single functionality of metamaterials is an important limitation on their practical applications for lack of tunability and reconfigurability.Here,we propose a tunable and reconfigurable non-Hermitian piezoelectric metamaterial bar,in which piezoelectric bars connect with resonant circuits,to achieve asymmetric unidirectional perfect absorption(UPA)and symmetric bidirectional perfect absorption(PA)at low frequencies.The two functions can be arbitrarily switched by rearranging shunted circuits.Based on the reverberation-ray matrix(RRM)method,an approach is provided to achieve UPA by setting an exceptional point(EP)in the coupled resonant bandgap.By using the transfer matrix method(TMM)and the finite element method(FEM),it is observed that a non-Hermitian pseudo-band forms between two resonant bandgaps,and the EP appears at the bottom of the pseudo-band.In addition,the genetic algorithm is used to accurately and efficiently design the shunted circuits for desired low-frequency UPA and PA.The present work may provide new strategies for vibration suppression and guided waves manipulation in wide potential applications. 展开更多
关键词 non-Hermitian metamaterial exceptional point(EP) unidirectional perfect absorption(UPA) piezoelectric metamaterial reverberation-ray matrix(RRM)method genetic algorithm
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Nonlinear perturbation of a high-order exceptional point:Skin discrete breathers and the hierarchical power-law scaling
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作者 江慧 成恩宏 +1 位作者 周子榆 郎利君 《Chinese Physics B》 SCIE EI CAS CSCD 2023年第8期319-326,共8页
We study the nonlinear perturbation of a high-order exceptional point(EP)of the order equal to the system site number L in a Hatano-Nelson model with unidirectional hopping and Kerr nonlinearity.Notably,we find a clas... We study the nonlinear perturbation of a high-order exceptional point(EP)of the order equal to the system site number L in a Hatano-Nelson model with unidirectional hopping and Kerr nonlinearity.Notably,we find a class of discrete breathers that aggregate to one boundary,here named as skin discrete breathers(SDBs).The nonlinear spectrum of these SDBs shows a hierarchical power-law scaling near the EP.Specifically,the response of nonlinear energy to the perturbation is given by E_(m)∝Γ~(α_(m)),whereα_(m)=3^(m-1)is the power with m=1,...,L labeling the nonlinear energy bands.This is in sharp contrast to the L-th root of a linear perturbation in general.These SDBs decay in a double-exponential manner,unlike the edge states or skin modes in linear systems,which decay exponentially.Furthermore,these SDBs can survive over the full range of nonlinearity strength and are continuously connected to the self-trapped states in the limit of large nonlinearity.They are also stable,as confirmed by a defined nonlinear fidelity of an adiabatic evolution from the stability analysis.As nonreciprocal nonlinear models may be experimentally realized in various platforms,such as the classical platform of optical waveguides,where Kerr nonlinearity is naturally present,and the quantum platform of optical lattices with Bose-Einstein condensates,our analytical results may inspire further exploration of the interplay between nonlinearity and non-Hermiticity,particularly on high-order EPs,and benchmark the relevant simulations. 展开更多
关键词 skin discrete breather hierarchical power-law scaling double-exponential decay non-Hermitian skin effect high-order exceptional point Kerr nonlinearity
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Effective interventions to improve domain-specific social, emotional, or academic outcomes for twice-exceptional individuals who are gifted with ADHD as a disability
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作者 La Shun Carroll 《Psychosomatic Medicine Research》 2023年第4期1-4,共4页
The demand for effective interventions to improve domain-specific academic outcomes for individuals with special needs at either end of the spectrum has existed for some time.Since the earlier contributions to the lit... The demand for effective interventions to improve domain-specific academic outcomes for individuals with special needs at either end of the spectrum has existed for some time.Since the earlier contributions to the literature documenting gifted individuals who were simultaneously exhibiting disabilities,there has been some progress in our understanding.We now know that in individuals with both gifts and disabilities,potentially,either or both of the exceptionalities can obscure the effects of the other,which significantly delays the average time to receive a diagnosis.Such delays in diagnosis detrimentally impact the the form of effective interventions without a diagnosis.The purpose of this paper is t quality of life across various domains because there can be no opportunity to receive help in o determine whether effective interventions exist to improve domain-specific(i.e.,social,emotional,or academic)outcomes for people with both gifts and disabilities.A query was performed using evidence databases TRIP and PDQ for“twice-exceptional,”“Giftedness,”“Disability,”and“intervention.”The four most relevant,freely available studies in English were selected for critique.Despite identifying potential threats to validity among the studies,methodological similarities among them were strong enough to confidently conclude that not only do effective interventions exist for the population of gifted with ADHD,but the outcomes of these interventions may also carry over into other domains resulting in indirect effects. 展开更多
关键词 domain specific intervention academic outcomes GIFTEDNESS twice exceptional SOCIAL EMOTIONAL academic ADHD
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Approach to evaluating exception handling of programs
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作者 姜淑娟 徐宝文 《Journal of Southeast University(English Edition)》 EI CAS 2007年第4期524-528,共5页
To solve the problems that the exception handling code is hard to test and maintain and that it affects the robustness and reliability of software, a method for evaluating the exception handling of programs is present... To solve the problems that the exception handling code is hard to test and maintain and that it affects the robustness and reliability of software, a method for evaluating the exception handling of programs is presented. The exception propagation graph (EPG) that describes the large programs with exception handling constructs is proposed by simplifying the control flow graph and it is applied to a case to verify its validity. According to the EPG, the exception handling code that never executes is identified; the points that are the most critical to controlling exception propagation are found; and the irrational exception handling code is corrected. The constructing algorithm for the EPG is given; thus, this provides a basis for automatically constructing the EPG and automatically correcting the irrational exception handling code. 展开更多
关键词 software robustness exception handling exception propagation evaluating program control flow graph
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VB中DivideByZeroException类的漏洞分析
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作者 郑有增 《微计算机信息》 2010年第12期224-225,223,共3页
美国微软开发的VB.NET2005可视化程序设计语言中,有一个DivideByZeroException类,它是当程序中有整数除法运算而除数为零时发生的异常,这种异常通过"Catch e As DivideByZeroException"语句来捕捉,捕捉到后根据相应的容错处... 美国微软开发的VB.NET2005可视化程序设计语言中,有一个DivideByZeroException类,它是当程序中有整数除法运算而除数为零时发生的异常,这种异常通过"Catch e As DivideByZeroException"语句来捕捉,捕捉到后根据相应的容错处理语句继续执行。但在教学实践和实际编程中发现,在整数除法运算中发生除数为零的情况时,DivideByZeroException类异常并不能发生,这反映了微软开发的VB.NET2005程序设计语言中的一个漏洞。对这个问题进行了分析,并提出了弥补该漏洞的解决方案。 展开更多
关键词 VB.NET2005 DivideByZeroexception exception 漏洞 漏洞分析
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AXSYM免疫发光仪常见“EXCEPTION”提示的处理
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作者 王厚照 史彩虹 +1 位作者 何燕红 周友泉 《现代检验医学杂志》 CAS 2003年第3期23-23,共1页
AXSYM全自动免疫化学发光分析仪是美国雅培公司最近才投入中国市场的,其通过微粒子酶免分析法(MEIA)、荧光偏振免疫分析法(FPIA)、离子捕捉免疫分析法(ICIA)及辐射能衰减分析法(REA)等四种方法对多种人体指标进行检测,如肿瘤标记物、性... AXSYM全自动免疫化学发光分析仪是美国雅培公司最近才投入中国市场的,其通过微粒子酶免分析法(MEIA)、荧光偏振免疫分析法(FPIA)、离子捕捉免疫分析法(ICIA)及辐射能衰减分析法(REA)等四种方法对多种人体指标进行检测,如肿瘤标记物、性激素、甲状腺激素、病毒及药物浓度等等.其检测快速、准确、简便、重复性好. 展开更多
关键词 exception AXSYM全自动免疫化学发光分析仪 检测 原因 故障
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EXAMPLES ON EXCEPTIONAL VALUES OF MEROMORPHIC FUNCTIONS
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作者 彭炎红 孙道椿 《Acta Mathematica Scientia》 SCIE CSCD 2011年第4期1327-1336,共10页
In this paper, by means of the definition of Borel exceptional value method, another exceptional value of meromorphic function which is a T exceptional value is defined by linking the concept of T direction. And we co... In this paper, by means of the definition of Borel exceptional value method, another exceptional value of meromorphic function which is a T exceptional value is defined by linking the concept of T direction. And we construct a meromorphic function with zero as Borel exceptional value, but not as T exceptional value; and another meromorphic function with zero as T exceptional value, but not as Borel exceptional value. 展开更多
关键词 meromorphic function Borel exceptional value T exceptional value
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Rough Set Based K-Exception Approach to Approximate Rule Reduction
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作者 ZHANG Feng ZHANG Xianfeng QIN Zhiguang LIU Jinde(School of Computer Science and Engineering University of Electronic Science and Technology of China,Sichuan,Chengdu 610054,P.R.China) 《Journal of Electronic Science and Technology of China》 2003年第1期43-46,62,共5页
There are rules refering to infrequent instances after the procession of attribute reductionand value reduction with traditional methods.A rough set RS based k-exception approach (RSKEA) torule reduction is presented.... There are rules refering to infrequent instances after the procession of attribute reductionand value reduction with traditional methods.A rough set RS based k-exception approach (RSKEA) torule reduction is presented.Its main idea lies in a two-phase RS based rule reduction.An ordinarydecision table is attained through general method of RS knowledge reduction in the first phase.Then a k-exception candidate set is nominated according to the decision table.RS rule reduction is employed forthe reformed source data set,which remove all the instances included in the k-exception set.We apply theapproach to the automobile database.Results show that it can reduce the number and complexity of ruleswith adjustable conflict rate,which contributes to approximate rule reduction. 展开更多
关键词 RULE exception k-exception set approximate rule reduction
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Exceptional family of elements and the solvability of complementarity problems in uniformly smooth and uniformly convex Banach spaces 被引量:3
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作者 ISACG. LIJin-lu 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2005年第4期289-295,共7页
The notion of “exceptional family of elements (EFE)” plays a very important role in solving complementarity prob- lems. It has been applied in finite dimensional spaces and Hilbert spaces by many authors. In this pa... The notion of “exceptional family of elements (EFE)” plays a very important role in solving complementarity prob- lems. It has been applied in finite dimensional spaces and Hilbert spaces by many authors. In this paper, by using the generalized projection defined by Alber, we extend this notion from Hilbert spaces to uniformly smooth and uniformly convex Banach spaces, and apply this extension to the study of nonlinear complementarity problems in Banach spaces. 展开更多
关键词 exceptional family of elements (EFE) Banach spaces and complementarity
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Entanglement of E8E8 Exceptional Lie Symmetry Group Dark Energy, Einstein’s Maximal Total Energy and the Hartle-Hawking No Boundary Proposal as the Explanation for Dark Energy 被引量:7
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作者 Mohamed S. El Naschie 《World Journal of Condensed Matter Physics》 2014年第2期74-77,共4页
The present note is concerned with two connected and highly important fundamental questions of physics and cosmology, namely if E8E8 Lie symmetry group describes the universe and where cosmic dark energy comes from. F... The present note is concerned with two connected and highly important fundamental questions of physics and cosmology, namely if E8E8 Lie symmetry group describes the universe and where cosmic dark energy comes from. Furthermore, we reason following Wheeler, Hartle and Hawking that since the boundary of a boundary is an empty set which models the quantum wave of the cosmos, then it follows that dark energy is a fundamental physical phenomenon associated with the boundary of the holographic boundary. This leads directly to a clopen universe which is its own Penrose tiling-like multiverse with energy density in full agreement with COBE, WMAP and Type 1a supernova cosmic measurements. 展开更多
关键词 E8 exceptional Lie Symmetry GROUP Dark Energy Einstein’s Relativity E-INFINITY Theory Wheeler BOUNDARY of a BOUNDARY Hartle-Hawking NO BOUNDARY PROPOSAL Penrose Tiling Multiverse
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Observation of the exceptional point in superconducting qubit with dissipation controlled by parametric modulation 被引量:1
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作者 Zhan Wang Zhongcheng Xiang +7 位作者 Tong Liu Xiaohui Song Pengtao Song Xueyi Guo Luhong Su He Zhang Yanjing Du Dongning Zheng 《Chinese Physics B》 SCIE EI CAS CSCD 2021年第10期66-72,共7页
Open physical systems described by the non-Hermitian Hamiltonian with parity-time-reversal(PT)symmetry show peculiar phenomena,such as the presence of an exceptional point(EP)at which the PT symmetry is broken and two... Open physical systems described by the non-Hermitian Hamiltonian with parity-time-reversal(PT)symmetry show peculiar phenomena,such as the presence of an exceptional point(EP)at which the PT symmetry is broken and two resonant modes of the Hamiltonian become degenerate.Near the EP,the system could be more sensitive to external perturbations and this may lead to enhanced sensing.In this paper,we present experimental results on the observation of PT symmetry broken transition and the EP using a tunable superconducting qubit.The quantum system of investigation is formed by the two levels of the qubit and the energy loss of the system to the environment is controlled by a method of parametric modulation of the qubit frequency.This method is simple with no requirements for additional elements or qubit device modifications.We believe it can be easily implemented on multi-qubit devices that would be suitable for further exploration of non-Hermitian physics in more complex and diverse systems. 展开更多
关键词 exceptional point parity-time-reversal(PT)symmetry longitudinal field modulation
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National Values in American Exceptionalism
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作者 叶薇 《海外英语》 2012年第24期219-220,共2页
Featured by its uniqueness and historic significance, American exceptionalism plays an indispensable role in shaping the American political,especially the foreign policies, as well as social lives. To understand the o... Featured by its uniqueness and historic significance, American exceptionalism plays an indispensable role in shaping the American political,especially the foreign policies, as well as social lives. To understand the origins of American exceptionalism, people must look into its national values-Puritanism, individualism and political system. 展开更多
关键词 AMERICAN exceptionALISM PURITANISM INDIVIDUALISM P
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Exceptionally Preserved Punctatus triangulicostalis and Its Post-embryonic Development
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作者 WANG Qi LIU Yunhuan +7 位作者 QIN Jiachen ZHANG Hu ZHANG Ya'nan SHAO Tiequan ZHANG Ting WEI Ronghao ZHANG Hongze WANG Feng 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2017年第6期2310-2311,共2页
Objective The putative coronatean Punctatus flourished at the beginning of the Cambrian explosion, and is significant in the exploration of the origin and evolution of early life. Liu Yunhuan established a new specie... Objective The putative coronatean Punctatus flourished at the beginning of the Cambrian explosion, and is significant in the exploration of the origin and evolution of early life. Liu Yunhuan established a new species: Punctatus triangulicostalis Liu, 2006. Two questions remain: how was the special body plan of P. triangulicostalis formed? How does P. triangulicostalis transform from embryo to the long cylindrical mature individual? Although the study of Steiner et al. in 2004 involved the above questions, they did not explain them clearly due to the lack of fossil materials at that time. This article aims to consider the above questions based on new information from several rare specimens. 展开更多
关键词 exceptionally Preserved Punctatus triangulicostalis Its Post-embryonic Development
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THE ENERGY FUNCTION WITH RESPECT TO THE ZEROS OF THE EXCEPTIONAL HERMITE POLYNOMIALS
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作者 Agota P.HORVATH 《Acta Mathematica Scientia》 SCIE CSCD 2017年第5期1483-1496,共14页
We examine the energy function with respect to the zeros of exceptional Hermite polynomials. The localization of the eigenvalues of the Hessian is given in the general case.In some special arrangements we have a more ... We examine the energy function with respect to the zeros of exceptional Hermite polynomials. The localization of the eigenvalues of the Hessian is given in the general case.In some special arrangements we have a more precise result on the behavior of the energy function. Finally we investigate the energy function with respect to the regular zeros of the exceptional Hermite polynomials. 展开更多
关键词 exceptional Hermite polynomials system of minimal energy energy function partitioned matrices
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Quantum exceptional points of non-Hermitian Hamiltonian and Liouvillian in dissipative quantum Rabi model
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作者 Xianfeng Ou Jiahao Huang Chaohong Lee 《Chinese Physics B》 SCIE EI CAS CSCD 2021年第11期233-239,共7页
The open quantum system can be described by either a Lindblad master equation or a non-Hermitian Hamiltonian(NHH).However,these two descriptions usually have different exceptional points(EPs),associated with the degen... The open quantum system can be described by either a Lindblad master equation or a non-Hermitian Hamiltonian(NHH).However,these two descriptions usually have different exceptional points(EPs),associated with the degeneracies in the open quantum system.Here,considering a dissipative quantum Rabi model,we study the spectral features of EPs in these two descriptions and explore their connections.We find that,although the EPs in these two descriptions are usually different,the EPs of NHH will be consistent with the EPs of master equation in the weak coupling regime.Further,we find that the quantum Fisher information(QFI),which measures the statistical distance between quantum states,can be used as a signature for the appearance of EPs.Our study may give a theoretical guidance for exploring the properties of EPs in open quantum systems. 展开更多
关键词 dissipative quantum Rabi model non-Hermitian Hamiltonian Lindblad master equation exceptional points
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Fabry–Prot resonance coupling associated exceptional points in a composite grating structure
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作者 Zhi-Sen Jiang De-Jiao Hu +2 位作者 Lin Pang Fu-Hua Gao Ping Wang 《Chinese Physics B》 SCIE EI CAS CSCD 2018年第5期209-214,共6页
The exceptional point(EP) is a significant and attractive phenomenon in an open quantum system. The scattering properties of light are similar to those in the open quantum system, which makes it possible to achieve ... The exceptional point(EP) is a significant and attractive phenomenon in an open quantum system. The scattering properties of light are similar to those in the open quantum system, which makes it possible to achieve EP in the optic system. Here we investigate the EP in a Fabry–P′erot(F–P) resonant coupling structure. The coupling between different types of F–P resonances leads to a near zero reflection, which results in a degeneration of eigenstates and thus the appearing of EP. Furthermore, the multi-wavelength EPs and unidirectional invisibility can be achieved which may be used in integrated photonics systems. 展开更多
关键词 exceptional point Fabry-Perot resonance metallic grating
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