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Comments on initial conditions for the Abraham-Lorentz(-Dirac) equation 对亚伯拉罕-洛伦兹(-狄拉克)方程初始条件的评述
arXiv: Classical Physics Pub Date : 2014-10-21 DOI: 10.1142/S0217751X15500116
O. Birnholtz
{"title":"Comments on initial conditions for the Abraham-Lorentz(-Dirac) equation","authors":"O. Birnholtz","doi":"10.1142/S0217751X15500116","DOIUrl":"https://doi.org/10.1142/S0217751X15500116","url":null,"abstract":"An accelerating electric charge coupled to its own electromagnetic (EM) field both emits radiation and experiences the radiation's reaction as a (self-)force. Considering the system from an Effective Field Theory perspective, and using the physical initial conditions of no incoming radiation can help resolve many of the problems associated with the often considered \"notorious\" Abraham-Lorentz / Abraham-Lorentz-Dirac equations.","PeriodicalId":331413,"journal":{"name":"arXiv: Classical Physics","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114437534","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
Completing the Li'enard-Wiechert potentials: The origin of the delta function fields for a charged particle in hyperbolic motion 完成Li enard-Wiechert势:双曲运动中带电粒子δ函数场的起源
arXiv: Classical Physics Pub Date : 2014-09-04 DOI: 10.1119/1.4904762
D. J. Cross
{"title":"Completing the Li'enard-Wiechert potentials: The origin of the delta function fields for a charged particle in hyperbolic motion","authors":"D. J. Cross","doi":"10.1119/1.4904762","DOIUrl":"https://doi.org/10.1119/1.4904762","url":null,"abstract":"Calculating the electromagnetic field of a uniformly accelerated charged particle is a surprisingly subtle problem that has been long discussed in the literature. While the correct field has been obtained many times and through various means, it remains somewhat unclear why the (supposedly general) field expression derived from the Li'enard-Wiechert potentials misses some terms. We present new derivations of the missing field and potential terms by considering only pure hyperbolic motion, and we amend the offending step in the standard Li'enard-Wiechert construction.","PeriodicalId":331413,"journal":{"name":"arXiv: Classical Physics","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132941864","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
Coherent detection of orbital angular momentum in radio 无线电轨道角动量的相干探测
arXiv: Classical Physics Pub Date : 2014-08-31 DOI: 10.21236/ada627259
L. Daldorff, S. Mohammadi, J. Bergman, B. Isham, M. Al-Nuaimi, K. Forozesh, T. Carozzi
{"title":"Coherent detection of orbital angular momentum in radio","authors":"L. Daldorff, S. Mohammadi, J. Bergman, B. Isham, M. Al-Nuaimi, K. Forozesh, T. Carozzi","doi":"10.21236/ada627259","DOIUrl":"https://doi.org/10.21236/ada627259","url":null,"abstract":"Abstract : The angular momentum propagated by a beam of radiation has two contributions: spin angular momentum (SAM) and orbital angular momentum (OAM). SAM corresponds to wave polarisation, while OAM-carrying beams are characterized by a phase which is a function of azimuth. We demonstrate experimentally that radio beams propagating OAM can be generated and coherently detected using ordinary electric dipole antennas. The results presented here could pave the way for novel radio OAM applications in technology and science, including radio communication, passive remote sensing, and new types of active (continuous or pulsed transmission) electromagnetic measurements.","PeriodicalId":331413,"journal":{"name":"arXiv: Classical Physics","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131549114","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Interaction of a Magnet and a Point Charge: Unrecognized Internal Electromagnetic Momentum Eliminates the Myth of Hidden Mechanical Momentum 磁体与点电荷的相互作用:未被识别的内部电磁动量消除了隐藏机械动量的神话
arXiv: Classical Physics Pub Date : 2014-08-16 DOI: 10.1119/1.4904040
T. Boyer
{"title":"Interaction of a Magnet and a Point Charge: Unrecognized Internal Electromagnetic Momentum Eliminates the Myth of Hidden Mechanical Momentum","authors":"T. Boyer","doi":"10.1119/1.4904040","DOIUrl":"https://doi.org/10.1119/1.4904040","url":null,"abstract":"A model calculation using the Darwin Lagrangian is carried out for a magnet consisting of two current-carrying charges constrained by centripetal forces to move in a circular path in the presence of the electric field from a distant external point charge. In the limit that the magnet's two charges are non-interacting, the calculation recovers the only valid calculation for hidden mechanical momentum. However, if the magnet's charges are mutually interacting, then there is internal electromagnetic linear momentum associated with the perturbed magnet's electrostatic charge distribution and the motion of the magnet's charges. This internal electromagnetic momentum does not seem to be recognized as distinct from the familiar external electromagnetic momentum associated with the electric field of the external charge and the magnetic field of the unperturbed magnet. In the multiparticle limit, the hidden mechanical momentum becomes negligible while the internal electromagnetic momentum provides the compensating linear momentum required by the relativistic conservation law connecting the total linear momentum to motion of the center of energy. Whereas the changes in the external electromagnetic momentum are often associated with magnetic forces of order $1/c^{2},$ changes in the internal electromagnetic momentum are associated with the electrical forces of order $1/c^{2}$. These electrical forces are relevant to the Shockley-James paradox and to the experimentally observed Aharonov-Bohm and Aharonov-Casher phase shifts.","PeriodicalId":331413,"journal":{"name":"arXiv: Classical Physics","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133334775","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 18
A passively tunable non-resonant acoustic metamaterial lens for selective ultrasonic excitation 一种用于选择性超声激发的被动可调谐非共振声学超材料透镜
arXiv: Classical Physics Pub Date : 2014-07-04 DOI: 10.1063/1.4894279
Hongfei Zhu, F. Semperlotti
{"title":"A passively tunable non-resonant acoustic metamaterial lens for selective ultrasonic excitation","authors":"Hongfei Zhu, F. Semperlotti","doi":"10.1063/1.4894279","DOIUrl":"https://doi.org/10.1063/1.4894279","url":null,"abstract":"In this paper, we present an approach to ultrasonic beam-forming and beam-steering in structures based on the concept of embedded non-resonant acoustic metamaterial lenses. The lens design exploits the principle of acoustic drop-channel which enables the dynamic coupling of multiple ultrasonic waveguides at selected frequencies. In contrast with currently available technology, the embedded lens allows generating directional excitation by means of a single ultrasonic transducer. The lens design and performance are numerically investigated by using Plane Wave Expansion and Finite Difference Time Domain techniques applied to bulk structures. Then, the design is experimentally validated on a thin aluminum plate where the lens is implemented by through-holes. The dynamic response of the embedded lens is estimated by reconstructing, via Laser Vibrometry, the velocity field induced by a piezoelectric shaker source.","PeriodicalId":331413,"journal":{"name":"arXiv: Classical Physics","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124227228","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 21
Closedness of orbits in a space with SU(2) Poisson structure 具有SU(2)泊松结构空间中轨道的封闭性
arXiv: Classical Physics Pub Date : 2014-06-26 DOI: 10.1142/S0217751X1450081X
A. Fatollahi, A. Shariati, M. Khorrami
{"title":"Closedness of orbits in a space with SU(2) Poisson structure","authors":"A. Fatollahi, A. Shariati, M. Khorrami","doi":"10.1142/S0217751X1450081X","DOIUrl":"https://doi.org/10.1142/S0217751X1450081X","url":null,"abstract":"The closedness of orbits of central forces is addressed in a three dimensional space in which the Poisson bracket among the coordinates is that of the SU(2) Lie algebra. In particular it is shown that among problems with spherically symmetric potential energies, it is only the Kepler problem for which all of the bounded orbits are closed. In analogy with the case of the ordinary space, a conserved vector (apart from the angular momentum) is explicitly constructed, which is responsible for the orbits being closed. This is the analog of the Laplace-Runge-Lenz vector. The algebra of the constants of the motion is also worked out.","PeriodicalId":331413,"journal":{"name":"arXiv: Classical Physics","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115498717","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Tuning gain and bandwidth of traveling wave tubes using metamaterial beam-wave interaction structures 利用超材料波束相互作用结构调谐行波管的增益和带宽
arXiv: Classical Physics Pub Date : 2014-06-16 DOI: 10.1063/1.4897235
R. Lipton, A. Polizzi
{"title":"Tuning gain and bandwidth of traveling wave tubes using metamaterial beam-wave interaction structures","authors":"R. Lipton, A. Polizzi","doi":"10.1063/1.4897235","DOIUrl":"https://doi.org/10.1063/1.4897235","url":null,"abstract":"We employ metamaterial beam-wave interaction structures for tuning the gain and bandwidth of short traveling wave tubes. The interaction structures are made from metal rings of uniform cross section, which are periodically deployed along the length of the traveling wave tube. The aspect ratio of the ring cross sections are adjusted to control both gain and bandwidth. The frequency of operation is controlled by the filling fraction of the ring cross section with respect to the period.","PeriodicalId":331413,"journal":{"name":"arXiv: Classical Physics","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114768310","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
Does the electromotive force (always) represent work 电动势(总是)表示功吗
arXiv: Classical Physics Pub Date : 2014-05-29 DOI: 10.7716/AEM.V4I1.257
Costas J. Papachristou, A. Magoulas
{"title":"Does the electromotive force (always) represent work","authors":"Costas J. Papachristou, A. Magoulas","doi":"10.7716/AEM.V4I1.257","DOIUrl":"https://doi.org/10.7716/AEM.V4I1.257","url":null,"abstract":"In the literature of Electromagnetism, the electromotive force of a \"circuit\" is often defined as work done on a unit charge during a complete tour of the latter around the circuit. We explain why this statement cannot be generally regarded as true, although it is indeed true in certain simple cases. Several examples are used to illustrate these points.","PeriodicalId":331413,"journal":{"name":"arXiv: Classical Physics","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123499251","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
The Preferred System of Reference Reloaded 重新加载首选引用系统
arXiv: Classical Physics Pub Date : 2014-05-26 DOI: 10.1007/978-3-319-13045-3_5
Israel Pérez
{"title":"The Preferred System of Reference Reloaded","authors":"Israel Pérez","doi":"10.1007/978-3-319-13045-3_5","DOIUrl":"https://doi.org/10.1007/978-3-319-13045-3_5","url":null,"abstract":"","PeriodicalId":331413,"journal":{"name":"arXiv: Classical Physics","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116173388","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
On the accuracy of the Timoshenko beam theory above the critical frequency: best shear coefficient 临界频率以上最佳剪切系数的Timoshenko梁理论的准确性
arXiv: Classical Physics Pub Date : 2014-05-19 DOI: 10.1017/JMECH.2015.104
J. Franco-Villafañe, R. A. M'endez-S'anchez
{"title":"On the accuracy of the Timoshenko beam theory above the critical frequency: best shear coefficient","authors":"J. Franco-Villafañe, R. A. M'endez-S'anchez","doi":"10.1017/JMECH.2015.104","DOIUrl":"https://doi.org/10.1017/JMECH.2015.104","url":null,"abstract":"We obtain values for the shear coefficient both below and above the critical frequency by comparing the results of the Timoshenko beam theory with experimental data published recently. The best results are obtained, by a least-square fitting, when different values of the shear coefficient are used below and above the critical frequency.","PeriodicalId":331413,"journal":{"name":"arXiv: Classical Physics","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114326852","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 10
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