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组合窗函数的短时傅里叶变换时频表示方法 被引量:29
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作者 肖瑛 冯长建 《探测与控制学报》 CSCD 北大核心 2010年第3期43-47,共5页
针对固定时间窗函数短时傅里叶变换(STFT)时频表示时间分辨率和频率分辨率相互制约,影响时频聚集性的缺陷,提出了一种组合窗函数的STFT时频表示方法。根据Heisenberg不确定性原理,分别利用长、短时间窗函数获得两组STFT时频表示,最终的... 针对固定时间窗函数短时傅里叶变换(STFT)时频表示时间分辨率和频率分辨率相互制约,影响时频聚集性的缺陷,提出了一种组合窗函数的STFT时频表示方法。根据Heisenberg不确定性原理,分别利用长、短时间窗函数获得两组STFT时频表示,最终的时频表示以两组时频表示的乘积确定。仿真跳频信号和遥测振动数据处理结果表明:组合窗函数的STFT时频表示方法能有效提高STFT的时频聚集性,特别适用于跳频信号的分析。 展开更多
关键词 短时傅里叶变换 heisenberg不确定性原理 遥测 振动信号
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利用改进希尔伯特—黄变换进行地震资料时频分析 被引量:13
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作者 曹思远 邴萍萍 +2 位作者 路交通 范廷恩 董建华 《石油地球物理勘探》 EI CSCD 北大核心 2013年第2期246-254,332+158-159,共9页
为了克服常规希尔伯特—黄变换(HHT)的缺陷,消除常规经验模态分解(EMD)产生的本征模态函数分量(IMF)中混叠的振荡模式,本文运用改进HHT,即通过引进小波包变换,首先将信号分解成一系列窄带信号,然后对这些窄带信号进行EMD获得一些IMF分量... 为了克服常规希尔伯特—黄变换(HHT)的缺陷,消除常规经验模态分解(EMD)产生的本征模态函数分量(IMF)中混叠的振荡模式,本文运用改进HHT,即通过引进小波包变换,首先将信号分解成一系列窄带信号,然后对这些窄带信号进行EMD获得一些IMF分量,再根据相关系数法,保留需要的IMF分量,去除虚假的IMF分量,最后进行HHT求取瞬时频率,得到改进HHT谱。改进HHT摆脱了小波变换中的海森堡测不准原理的限制,以及常规HHT模态混叠对分析的干扰。虽然改进HHT谱高频成分存在跳跃现象,但都围绕在真实频率值周围,并且较小波时频图的频带窄很多,能够反映信号的真实频率特性。数值模拟与实际地震记录处理结果证明了改进HHT的可行性。 展开更多
关键词 改进HHT 小波包变换 海森堡测不准原理 EMD IMF 时频分析
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Exploring the Implications of the Deformation Parameter and Minimal Length in the Generalized Uncertainty Principle
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作者 Mahgoub A. Salih Taysir M. Elmahdi 《Journal of Quantum Information Science》 CAS 2024年第1期1-14,共14页
The breakdown of the Heisenberg Uncertainty Principle occurs when energies approach the Planck scale, and the corresponding Schwarzschild radius becomes similar to the Compton wavelength. Both of these quantities are ... The breakdown of the Heisenberg Uncertainty Principle occurs when energies approach the Planck scale, and the corresponding Schwarzschild radius becomes similar to the Compton wavelength. Both of these quantities are approximately equal to the Planck length. In this context, we have introduced a model that utilizes a combination of Schwarzschild’s radius and Compton length to quantify the gravitational length of an object. This model has provided a novel perspective in generalizing the uncertainty principle. Furthermore, it has elucidated the significance of the deforming linear parameter β and its range of variation from unity to its maximum value. 展开更多
关键词 Generalized uncertainty principle Deformed heisenberg Algebra Minimal Length
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Heuristic Estimation of the Vacuum Energy Density of the Universe: Part II-Analysis Based on Frequency Domain Electromagnetic Radiation
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作者 Vernon Cooray Gerald Cooray +1 位作者 Marcos Rubinstein Farhad Rachidi 《Journal of Electromagnetic Analysis and Applications》 2024年第1期1-9,共9页
In Part I of this paper, an inequality satisfied by the vacuum energy density of the universe was derived using an indirect and heuristic procedure. The derivation is based on a proposed thought experiment, according ... In Part I of this paper, an inequality satisfied by the vacuum energy density of the universe was derived using an indirect and heuristic procedure. The derivation is based on a proposed thought experiment, according to which an electron is accelerated to a constant and relativistic speed at a distance L from a perfectly conducting plane. The charge of the electron was represented by a spherical charge distribution located within the Compton wavelength of the electron. Subsequently, the electron is incident on the perfect conductor giving rise to transition radiation. The energy associated with the transition radiation depends on the parameter L. It was shown that an inequality satisfied by the vacuum energy density will emerge when the length L is pushed to cosmological dimensions and the product of the radiated energy, and the time duration of emission is constrained by Heisenberg’s uncertainty principle. In this paper, a similar analysis is conducted with a chain of electrons oscillating sinusoidally and located above a conducting plane. In the thought experiment presented in this paper, the behavior of the energy radiated by the chain of oscillating electrons is studied in the frequency domain as a function of the length L of the chain. It is shown that when the length L is pushed to cosmological dimensions and the energy radiated within a single burst of duration of half a period of oscillation is constrained by the fact that electromagnetic energy consists of photons, an inequality satisfied by the vacuum energy density emerges as a result. The derived inequality is given by where is the vacuum energy density. This result is consistent with the measured value of the vacuum energy density, which is 5.38 × 10<sup>-10</sup> J/m. The result obtained here is in better agreement with experimental data than the one obtained in Part I of this paper with time domain radiation. 展开更多
关键词 Classical Electrodynamics Electromagnetic Radiation Action Radiated Energy PHOTON heisenberg’s uncertainty principle Dark Energy Vacuum Energy Cosmological Constant Hubble Radius
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基于傅里叶变换的不确定性原理
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作者 于海燕 郑神州 《大学物理》 2024年第1期1-4,共4页
以波函数的规范化模平方积分作为概率密度函数,我们给出了在L 2意义下的位移函数与速度函数的方差乘积有正下界的海森伯不等式;并用傅里叶变换的微分性质、Plancherel等式以及Cauchy-Schwarz不等式作了证明.另外,Hardy不确定性原理表明... 以波函数的规范化模平方积分作为概率密度函数,我们给出了在L 2意义下的位移函数与速度函数的方差乘积有正下界的海森伯不等式;并用傅里叶变换的微分性质、Plancherel等式以及Cauchy-Schwarz不等式作了证明.另外,Hardy不确定性原理表明可积函数和它的傅里叶变换不能同时迅速衰减,其最优的衰减方式是取高斯函数形式达到等式;基于Phragmen-Lindelof定理(无界区域上的最大模原理),给出了Hardy不确定性的复分析方法证明;最后我们给出了推广的Morgan不等式和Beurling不确定性. 展开更多
关键词 傅里叶变换 海森伯不确定性 Hardy不确定性 Morgan不等式 Beurling不确定性
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通信密码学前瞻:量子密码技术 被引量:6
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作者 熊红凯 施惠昌 戴善荣 《上海大学学报(自然科学版)》 CAS CSCD 2000年第2期150-156,共7页
安全性是密码学研究一直追求的目标 ,最近取得飞速发展的量子加密技术综合了量子力学原理和经典密码术 ,具有可证明的安全性 ,同时还能对窃听者的非法侵入进行检测 ,克服了传统密码学的桎梏 ,为未来的网络通信提供了真正确实的保障 .此... 安全性是密码学研究一直追求的目标 ,最近取得飞速发展的量子加密技术综合了量子力学原理和经典密码术 ,具有可证明的安全性 ,同时还能对窃听者的非法侵入进行检测 ,克服了传统密码学的桎梏 ,为未来的网络通信提供了真正确实的保障 .此文讨论了量子加密的相关研究及实用化实验模型 ,详细说明了量子密钥分发协议 。 展开更多
关键词 量子加密 通信密码学 量子密码技术 安全性
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本科量子物理实验课程探索
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作者 陈丽清 吴媛 +1 位作者 尹亚玲 刘金梅 《物理实验》 2024年第1期14-21,共8页
近20年,国际量子科技取得重大进展,在未来科技发展中占据重要地位.因此,在物理专业本科实验教学中设置量子物理实验,让学生深入理解微观量子物理基本原理,掌握一定的量子前沿技术非常必要.华东师范大学物理学专业自主开发量子物理本科... 近20年,国际量子科技取得重大进展,在未来科技发展中占据重要地位.因此,在物理专业本科实验教学中设置量子物理实验,让学生深入理解微观量子物理基本原理,掌握一定的量子前沿技术非常必要.华东师范大学物理学专业自主开发量子物理本科实验教学仪器和虚拟仿真实验,在物理学专业拔尖班开设量子物理实验,取得了优异的成果.本文详细介绍了华东师范大学量子物理实验课程设置以及实施过程,分析开展相关本科量子物理实验的可能性及其普及性,为全国高校开设量子物理实验课程提供参考. 展开更多
关键词 量子物理实验 真空场测量 海森堡不确定关系 引力波测量演示实验 量子光源
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氢原子圆轨道对三维径向位置和径向动量不确定度的探究
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作者 孙华洋 陈理想 《大学物理》 2024年第7期6-10,共5页
在直角坐标系中,线位置和线动量满足不确定性关系,ΔxΔp≥h/2.而关于径向位置和径向动量是否满足类似的不确定关系式是近年来的研究热点之一,其中的关键是如何构建一个满足自伴随条件的径向算符.在二维双曲动量算符的启发下,本文从理... 在直角坐标系中,线位置和线动量满足不确定性关系,ΔxΔp≥h/2.而关于径向位置和径向动量是否满足类似的不确定关系式是近年来的研究热点之一,其中的关键是如何构建一个满足自伴随条件的径向算符.在二维双曲动量算符的启发下,本文从理论上研究了三维双曲动量算符与径向位置对数满足的不确定关系.以氢原子为例,计算了不同圆轨道所对应的径向位置对数及三维双曲动量的不确定度的乘积形式,Δln rΔP_(H),并发现了随着主量子数的增大,圆轨道波函数与智慧态之间的逼近关系. 展开更多
关键词 三维双曲动量 氢原子 海森伯不确定性原理 智慧态
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Hints of the Photonic Nature of the Electromagnetic Fields in Classical Electrodynamics
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作者 Vernon Cooray Gerald Cooray +1 位作者 Marcos Rubinstein Farhad Rachidi 《Journal of Electromagnetic Analysis and Applications》 2023年第3期25-42,共18页
Several recent publications show that the electromagnetic radiation generated by transmitting antennas satisfy the following universal conditions: The time domain radiation fields satisfy the condition A ≥ h/4π &... Several recent publications show that the electromagnetic radiation generated by transmitting antennas satisfy the following universal conditions: The time domain radiation fields satisfy the condition A ≥ h/4π &Rightarrow;q ≥ e where A is the action of the radiation field, which is defined as the product of the radiated energy and the duration of the radiation, h is the Planck constant, e is the electronic charge and q is the charge associated with the radiating system. The frequency domain radiation fields satisfy the condition U ≥ hv &Rightarrow;q ≥ e where U is the energy radiated in a single burst of radiation of duration T/2 and v is the frequency of oscillation. The goal of this paper is to show that these conditions, which indeed are expressions of the photonic nature of the electromagnetic fields, are satisfied not only by the radiation fields generated by physical antennas but also by the radiation fields generated by accelerating or decelerating electric charges. The results presented here together with the results obtained in previous studies show that hints of the photonic nature of the electromagnetic radiation remain hidden in the field equations of classical electrodynamics, and they become apparent when the dimension of the radiating system is pushed to the extreme limits as allowed by nature. 展开更多
关键词 Classical Electrodynamics Electromagnetic Radiation Action Radiated Energy PHOTON heisenberg’s uncertainty principle Dark Energy Vacuum Energy Hubble Radius
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Heuristic Estimation of the Vacuum Energy Density of the Universe: Part I—Analysis Based on Time Domain Electromagnetic Radiation
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作者 Vernon Cooray Gerald Cooray +1 位作者 Marcos Rubinstein Farhad Rachidi 《Journal of Electromagnetic Analysis and Applications》 2023年第6期73-81,共9页
In this paper, an inequality satisfied by the vacuum energy density of the universe is derived using an indirect and heuristic procedure. The derivation is based on a proposed thought experiment, according to which an... In this paper, an inequality satisfied by the vacuum energy density of the universe is derived using an indirect and heuristic procedure. The derivation is based on a proposed thought experiment, according to which an electron is accelerated to a constant and relativistic speed at a distance L from a perfectly conducting plane. The charge of the electron is represented by a spherical charge distribution located within the Compton wavelength of the electron. Subsequently, the electron is incident on the perfect conductor giving rise to transition radiation. The energy associated with the transition radiation depends on the parameter L. It is shown that an inequality satisfied by the vacuum energy density will emerge when the length L is pushed to cosmological dimensions and the product of the radiated energy and the time duration of emission are constrained by Heisenberg’s uncertainty principle. The inequality derived is given by ρ<sub>Λ</sub> ≤ 9.9×10<sup>-9</sup>J/m<sup>3</sup> where ρ<sub>Λ </sub>is the vacuum energy density. This result is consistent with the measured value of the vacuum energy density, which is 0.538 × 10<sup>-9</sup>J/m. Since there is a direct relationship between the vacuum energy density and the Einstein’s cosmological constant, the inequality can be converted directly to that of the cosmological constant. 展开更多
关键词 Classical Electrodynamics Electromagnetic Radiation Action Radiated Energy PHOTON heisenberg’s uncertainty principle Dark Energy Vacuum Energy Cosmological Constant Hubble Radius
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Squaring the Circle Is Possible When Taking into Consideration the Heisenberg Uncertainty Principle
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作者 Espen Gaarder Haug 《Journal of Applied Mathematics and Physics》 2023年第2期478-483,共6页
Squaring the circle is one of the oldest challenges in mathematical geometry. In 1882, it was proven that π was transcendental, and the task of squaring the circle was considered impossible. Demonstrating that squari... Squaring the circle is one of the oldest challenges in mathematical geometry. In 1882, it was proven that π was transcendental, and the task of squaring the circle was considered impossible. Demonstrating that squaring the circle was not possible took place before discovering quantum mechanics. The purpose of this paper is to show that it is actually possible to square the circle when taking into account the Heisenberg uncertainty principle. The conclusion is clear: it is possible to square the circle when taking into account the Heisenberg uncertainty principle. 展开更多
关键词 Squaring the Circle Quantum Mechanics heisenberg uncertainty principle
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量子计量学理论背景
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作者 丁国 郭胜 +1 位作者 朱敬华 邓鹏波 《宇航计测技术》 CSCD 2023年第6期44-48,共5页
概述了量子力学的历史,介绍了薛定谔方程及其波函数的解释、泡利不相容原理、海森堡测不准原理,对海森堡测不准原理使用样本数值计算来说明。简要讨论了量子效应在计量学中的应用、介绍和比较了传统标准和量子标准的精度和分辨率的限制... 概述了量子力学的历史,介绍了薛定谔方程及其波函数的解释、泡利不相容原理、海森堡测不准原理,对海森堡测不准原理使用样本数值计算来说明。简要讨论了量子效应在计量学中的应用、介绍和比较了传统标准和量子标准的精度和分辨率的限制,并论述了量子效应在新国际单位制中的作用。虽然量子效应的应用范围广泛,但因为其理论性较强,难于被大众所理解,体现在2018版SI中存在诸多的缺点和不足。最后,展望了量子计量学广阔的发展前景。 展开更多
关键词 薛定谔方程 泡利不相容原理 海森堡测不准原理 普朗克定律 SI系统
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Classical Electromagnetic Fields of Moving Charges as a Vehicle to Probe the Connection between the Elementary Charge and Heisenberg’s Uncertainty Principle 被引量:2
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作者 Vernon Cooray Gerald Cooray 《Natural Science》 2017年第7期219-230,共12页
The radiation fields generated when a charged particle is incident on or moving away from a perfectly conducting plane are obtained. These fields are known in the literature as transition radiation. The field equation... The radiation fields generated when a charged particle is incident on or moving away from a perfectly conducting plane are obtained. These fields are known in the literature as transition radiation. The field equations derived thus are used to evaluate the energy, momentum and the action associated with the radiation. The results show that for a charged particle moving with speed ν, the longitudinal momentum associated with the transition radiation is approximately equal to ΔU/c for values of ?1- ν/c smaller than about 10-3 where ΔU is the total radiated energy dissipated during the interaction and cis the speed of light in free space. The action of the radiation, defined as the product of the total energy dissipated and the duration of the emission, increases as 1- ν/c decreases and, for an electron, it becomes equal to h/4π when ν = c - νm where νm is the speed pertinent to the lowest possible momentum associated with a particle confined inside the universe and?h is the Planck constant. Combining these results with Heisenberg’s uncertainty principle, an expression that predicts the value of the elementary charge is derived. 展开更多
关键词 Transition Radiation heisenberg’s uncertainty principle Electronic CHARGE ELEMENTARY CHARGE Size of the UNIVERSE
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Investigation of Heisenberg algebra for a modified anti-de Sitter and modified antiSnyder models
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作者 Nasrin Farahani Hassan Hassanabadi +1 位作者 Won Sang Chung Leyla Naderi 《Communications in Theoretical Physics》 SCIE CAS CSCD 2020年第3期51-59,共9页
In this paper,we consider a possible modification of the de Sitter and anti-de Sitter space for the extended uncertainty principle.For the modified anti-de Sitter model we discuss the representation and wave functions... In this paper,we consider a possible modification of the de Sitter and anti-de Sitter space for the extended uncertainty principle.For the modified anti-de Sitter model we discuss the representation and wave functions of the momentum operator for a one-dimensional box problem.Also,we consider modified Snyder and anti-Snyder models for the generalized uncertainty principle.Then,we assume the Hamiltonian with different potential and solve the Heisenberg algebra for the modified(anti)-de Sitter and(anti)-Snyder models in both position and in the momentum space. 展开更多
关键词 modified(anti)-de SITTER model extended uncertainty principle generalized uncertainty principle heisenberg ALGEBRA
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量子力学的哥本哈根解释 被引量:3
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作者 黄永义 《物理与工程》 2020年第6期3-11,14,共10页
本文较详细地阐述了量子力学的哥本哈根解释,包括玻尔并协性原理和海森堡不确定原理、经典仪器、波函数坍缩、哥本哈根解释视角中的因果律。本文还列举了基于该解释的两个典型的测量实例:惠勒延迟选择实验和没有相互作用的相互作用;简... 本文较详细地阐述了量子力学的哥本哈根解释,包括玻尔并协性原理和海森堡不确定原理、经典仪器、波函数坍缩、哥本哈根解释视角中的因果律。本文还列举了基于该解释的两个典型的测量实例:惠勒延迟选择实验和没有相互作用的相互作用;简要介绍了其他有影响力的量子力学解释:多世界解释、自洽历史理论、量子贝叶斯模型等。 展开更多
关键词 玻尔并协性原理 海森堡不确定原理 经典仪器 波函数坍缩 因果律 量子测量效应
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量子密码技术及应用模型 被引量:1
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作者 熊红凯 施惠昌 戴善荣 《通信保密》 2000年第1期4-9,,13,,共7页
最近取得飞速发展的量子加密技术综合了量子力学原理和经典密码术,具有可证明的安全性,同时还能对窃听者的非法侵入进行检测。本文介绍了有关的量子力学理论,针对主要的量子密钥分发协议BB84进行了说明,并在此基础上提供了具体的试验模... 最近取得飞速发展的量子加密技术综合了量子力学原理和经典密码术,具有可证明的安全性,同时还能对窃听者的非法侵入进行检测。本文介绍了有关的量子力学理论,针对主要的量子密钥分发协议BB84进行了说明,并在此基础上提供了具体的试验模型,最后谈论了量子密码技术需要改善的一些问题。 展开更多
关键词 量子密码 量子力学 量子密钥分发
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超声导波针对均匀腐蚀的无基准评定方法 被引量:3
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作者 张耀烨 李冬生 周智 《振动与冲击》 EI CSCD 北大核心 2019年第2期110-115,共6页
考虑了源于时频分析的固有不确定性对测量精度的影响,运用超声导波对加速腐蚀试验条件下的钢丝剩余直径量进行了无基准评定。选择了导波针对均匀腐蚀程度具有较高分辨率的频率段,并利用局部的频散关系建立了一个基于二元显式测量函数的... 考虑了源于时频分析的固有不确定性对测量精度的影响,运用超声导波对加速腐蚀试验条件下的钢丝剩余直径量进行了无基准评定。选择了导波针对均匀腐蚀程度具有较高分辨率的频率段,并利用局部的频散关系建立了一个基于二元显式测量函数的近似直径表达式,以避免后续对复杂Pochhammer方程的多次求解;对接收信号进行小波相关性分析,并推导了基于复Morlet小波的时间-频率不确定度定量表达式;将基于GUM法与自适应蒙特卡洛法(MCM)求解所获取的直径评定结果进行了对比验证,证明了运用GUM法可更为高效地评定构件的均匀腐蚀状态。 展开更多
关键词 结构健康监测 频散特性 相关性分析 海森堡不确定性原理 GUM法
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利用海森堡不确定性原理研究全反射X射线光学器件的焦斑极限(英文) 被引量:3
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作者 孙天希 刘志国 +2 位作者 彭松 孙蔚渊 丁训良 《中国激光》 EI CAS CSCD 北大核心 2013年第12期262-264,共3页
全反射X射线光学器件在X射线显微技术中具有重要的应用,有关其焦斑极限的研究对该器件的设计者和使用者具有指导意义。利用海森堡不确定性原理研究了全反射X射线光学器件的焦斑极限。理论结果表明:全反射X射线光学器件的焦斑极限与器件... 全反射X射线光学器件在X射线显微技术中具有重要的应用,有关其焦斑极限的研究对该器件的设计者和使用者具有指导意义。利用海森堡不确定性原理研究了全反射X射线光学器件的焦斑极限。理论结果表明:全反射X射线光学器件的焦斑极限与器件的材料有关;利用镍金属、铅玻璃和硼硅酸盐玻璃制成的全反射X射线光学器件的焦斑极限分别为3.2、4.2和6.6nm。 展开更多
关键词 X射线光学 焦斑极限 海森堡不确定性原理 全反射X射线光学器件
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传递函数法用于变压器冲击试验的故障诊断 被引量:2
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作者 黄忠海 朱旭东 《华东电力》 北大核心 2005年第3期41-43,共3页
利用传递函数法进行变压器故障判断时,传递函数的计算直接影响判断的准确性,试验数据的分析表明,在相同的试验条件下,合理选择采样率和记录长度并对采集到的数据进行滤波将有利于传递函数的计算,从而得到更准确的试验结果。
关键词 传递函数 离散GABOR变换 三指数拟合 heisenberg不确定原则 FFT
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带陷阱的B 92量子密钥分配协议 被引量:1
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作者 胡耀祖 肖正安 肖旸 《武汉理工大学学报(信息与管理工程版)》 CAS 2005年第6期8-11,共4页
把量子力学应用到密码学中产生了一个新的学科——量子密码学。量子密码提供的密钥交换方式,能够自动检查是否有人在窃听,这是公钥体制所不具备的。对有噪声的B 92协议作了一些改进,这种改进的核心思想是在考虑提高传输效率的基础上,发... 把量子力学应用到密码学中产生了一个新的学科——量子密码学。量子密码提供的密钥交换方式,能够自动检查是否有人在窃听,这是公钥体制所不具备的。对有噪声的B 92协议作了一些改进,这种改进的核心思想是在考虑提高传输效率的基础上,发信方故意公布假的测量基,以诱使窃听者现身。考虑到实际应用情况,此方案采用的是在实用中保证安全性的前提下,发送方和接受方通过第三方普通信道协商好量子接收的规则,从而大大提高了传输的效率。这种改进方案对其他带有噪声的量子密码协议同样适用。 展开更多
关键词 量子密钥分配 B92协议 传输效率 heisenberg的测不准原理 量子不可克隆定理
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