检索结果-南通市图书馆

The complex Maxwell stress tensor theorem:The imaginary stress tensor and the reactive strength of orbital momentum.A novel scenery underlying electromagnetic optical forces

引用

Light(Science & Applications) 2022年第11期11卷 2655-2675页

作者： Manuel Nieto-Vesperinas Xiaohao Xu Instituto de Ciencia de Materiales de Madrid Consejo Superior de Investigaciones Cintificas.Campus de CantoblancoMadrid 28049Spain State Key Laboratory of Transient Optics and Photonics Xi'an Institute of Optics and Precision MechanicsChinese Academy of SciencesXi'an 710119China Institute of Nanophotonics Jinan UniversityGuangzhou 511443China

We uncover the existence of a universal phenomenon concerning the electromagnetic optical force exerted by light or other electromagnetic waves on a distribution of charges and currents in general,and of particles in particular.This conveys the appearence of underlying reactive quantities that hinder radiation pressure and currently observed timeaveraged forces.This constitutes a novel paradigm of the mechanical effciency of light on matter,and completes the landscape of the optical,and generally electromagnetic,force in photonics and classical electrodynamics;widening our understanding in the design of both llumination and particles in optical manipulation without the need of increasing the illuminating power,and thus lowering dissipation and heating.We show that this may be accomplished through the minimization of what we establish as the reactive strength of orbital(or canonical)momentum,which plays against the optical force a role analogous to that of the reactive power versus the radiation effciency of an antenna.This long time overlooked quantity,important for current progress of optical manipulation,and that stems from the complex Maxwell theorem of conservation of complex momentum that we put forward,as well as its alternating flow associated to the imaginary part of the complex Maxwell stress tensor,conform the imaginary Lorentz force that we introduce in this work,and that like the reactive strength of orbital momentum,is antagonistic to the well-known time-averaged force;thus making this reactive Lorentz force indirectly observable near wavelengths at which the time-averaged force is lowered.The Minkowski and Abraham momenta are also addressed.

关键词： imaginary tensor orbital

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

An innovative orbital implant positioner for the proper restoration of eye-socket defects

引用

生物设计与制造（英文） 2023年第1期6卷 82-89页

作者： Marco Mandolini Agnese Brunzini Manila Caragiuli Alida Mazzoli Mario Pagnoni Department of Industrial Engineering and Mathematical Sciences UniversitàPolitecnica Delle MarcheVia Brecce Bianche 1260131 AnconaItaly Department of Materials Environmental Sciences and Urban PlanningUniversitàPolitecnica Delle MarcheVia Brecce Bianche 1260131 AnconaItaly yourFACE Clinica Ars BiomedicaVia Luigi Bodio 5800191 RomeItaly

Fractures to the orbital walls and floor must be appropriately managed to avoid severe conditions.This results in particularly challenging anatomical reconstructions.The main issues are the implant’s proper shaping,placement,and orientation onto the eye socket.A new,customized implant-shaping mould has already been developed to shape patient-specific implants.However,it still does not address the implant positioning in the fractured orbital cavity.

关键词： socket orbital walls

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

orbital cyclicity in sedimentary sequence and climatic indications of C-O isotopes from Lower Cretaceous in Qingxi Sag, Jiuquan Basin, NW China

引用

Geoscience Frontiers 2019年第2期10卷 467-479页

作者： Siding Jin Haiyang Cao Hua Wang Michael Wagreich Sylvain Richoz State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Chengdu University of Technology College of Energy Resources Chengdu University of Technology Institute of Sedimentary Geology Center for Post-doctoral StudiesChengdu University of Technology Key Laboratory of Tectonics and Petroleum Resources China University of Geosciences Department of Geodynamics and Sedimentology University of Vienna Institute of Earth Sciences NAWI GrazUniversity of Graz

Sedimentary deposits of the Lower Cretaceous Xiagou Formation form the most significant potential hydrocarbon reservoirs in the Qingxi Sag, Jiuquan Basin(NW China). Zircon U-Pb ages of the dated basalts at the top of the Xiagou Formation give an isochron age of 115.6 Ma, and the sedimentation interval of the Xiagou Formation was speculated to range from about 125/124 Ma to 115 Ma based on paleontological research and stratigraphic correlation analysis. Here we use GR logging data as a palaeoenvironmental and palaeoclimatic proxy to conduct a detailed cyclostratigraphic study of five selected wells. Power spectra, evolutionary fast Fourier transformation and wavelet analysis all reveal significant sedimentary cycles in the Xiagou Formation. The ratios of cycle wavelengths in these stratigraphic units are 33.82 m : 7.91 m : 3.06 m : 1.79 m, which is similar to the ratio of orbital targets of 20 : 5 : 2 : 1. The ratio of 20 : 5 : 2 : 1 is interpreted as Milankovitch cycles of 405 kyr long eccentricity,100 kyr short eccentricity, 37 kyr obliquity, and 22 kyr precession cycles respectively. A high-resolution astronomical time scale is constructed by tuning the stratigraphy into target curves of orbital cycles respectively. Based on the astronomical time scale, the absolute ages of 55 samples were estimated,which are used for subsequent stable carbon and oxygen isotope stratigraphy analysis. The analysis results of the five studied wells in the Qingxi Sag indicate:(1) a negative trend of δ^(13)C values upwards in the Xiagou Formation, and(2) negative δ^(18)O values with a positive trend upwards. Both relatively heavy values and pronounced covariances of δ^(13)C values and δ^(18)O values indicate an arid-evaporationcontrolled climate during the sedimentary period of the Lower Cretaceous Xiagou Formation, Qingxi Sag, Jiuquan Basin. Moreover, positive covariances of SQK_1g_(2+3) indicate extremely high temperature, and negative covariances of SQK_1g_1 indicate a relatively low temperature.

关键词： Jiuquan Basin Qingxi Sag Xiagou Formation orbital cyclicity Stable isotope

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Storage of telecom-C-band heralded single photons with orbital-angular-momentum encoding in a crystal

引用

Science Bulletin 2019年第21期64卷 1577-1583页

作者： Yi-Lin Hu Tian-Shu Yang Zong-Quan Zhou Jian Wang Xiao Liu Zong-Feng Li Pei-Yun Li Yu Ma Chao Liu Peng-Jun Liang Jun Hu Xue Li Chuan-Feng Li Guang-Can Guo CAS Key Laboratory of Quantum Information University of Science and Technology of ChinaHefei 230026China CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China

A memory-based quantum repeater architecture provides a solution to distribute quantum information to an arbitrary long distance.Practical quantum repeaters are likely to be built in optical-fiber networks which take advantage of the low-loss transmission between quantum memory nodes.Most quantum memory platforms have characteristic atomic transitions away from the telecommunication band.A nondegenerate photon pair source is therefore useful for connection of a quantum memory to optical fibers.Here,we report a high-brightness narrowband photon-pair source which is compatible with a rare-earth-ion-doped crystal Pr^3+:Y2SiO5.The photon-pair source is generated through a cavityenhanced spontaneous parametric down-conversion process with the signal photon at 606 nm and the idler photon at 1540 nm.Moreover,using the telecom C-band idler photons for heralding,we demonstrate the reversible transfer of orbital-angular-momentum qubit between the signal photon and the quantum memory based on Pr3^+:Y2SiO5.

关键词： Quantum repeater Quantum memory Heralded single photons orbital angular momentum Telecommunication band

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

orbital reference frame estimation with power spectral density constraints for drag-free satellites

引用

Chinese Journal of Aeronautics 2016年第6期29卷 1721-1729页

作者： Zhang Yonghe Wang Yamin Mao Qingyun Liang Xuwen Shanghai Institute of Microsystem and Information Technology Chinese Academy of SciencesShanghai 200050China Shanghai Engineering Centre for Microsatellites Shanghai 201210China Joint Key Laboratory of Microsatellite Chinese Academy of SciencesShanghai 201210China

The drag-free satellites are widely used in the field of fundamental science as they enable the high-precision measurement in pure gravity fields. This paper investigates the estimation of local orbital reference frame(LORF) for drag-free satellites. An approach, taking account of the combination of the minimum estimation error and power spectral density(PSD) constraint in frequency domain, is proposed. Firstly, the relationship between eigenvalues of estimator and transfer function is built to analyze the suppression and amplification effect on input signals and obtain the eigenvalue range. Secondly, an optimization model for state estimator design with minimum estimation error in time domain and PSD constraint in frequency domain is established. It is solved by the sequential quadratic programming(SQP) algorithm. Finally, the orbital reference frame estimation of low-earth-orbit satellite is taken as an example, and the estimator of minimum variance with PSD constraint is designed and analyzed using the method proposed in this paper.

关键词： Drag-free satellite orbital reference frame Power spectral density State estimation Transfer function

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

orbital-Ordering Driven Simultaneous Tunability of Magnetism and Electric Polarization in Strained Monolayer VCl_(3)

引用

Chinese Physics Letters 2024年第4期41卷 126-131页

作者：郭的坪王聪王侣锦陆赟豪吴骅张妍宁季威 Beijing Key Laboratory of Optoelectronic Functional Materials&Micro-Nano Devices Department of PhysicsRenmin University of ChinaBeijing 100872China Key Laboratory of Quantum State Construction and Manipulation(Ministry of Education) Renmin University of ChinaBeijing 100872China Zhejiang Province Key Laboratory of Quantum Technology and Device State Key Laboratory of Silicon MaterialsDepartment of PhysicsZhejiang UniversityHangzhou 310027China Laboratory for Computational Physical Sciences(MOE) State Key Laboratory of Surface Physicsand Department of PhysicsFudan UniversityShanghai 200433China Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054China

Two-dimensional(2D)van der Waals magnetic materials have promising and versatile electronic and magnetic properties in the 2D limit,indicating a considerable potential to advance spintronic applications.Theoretical predictions thus far have not ascertained whether monolayer VCl_(3) is a ferromagnetic(FM)or anti-FM monolayer;this also remains to be experimentally verified.We theoretically investigate the influence of potential factors,including C_(3) symmetry breaking,orbital ordering,epitaxial strain,and charge doping,on the magnetic ground state.Utilizing first-principles calculations,we predict a collinear type-Ⅲ FM ground state in monolayer VCl_(3) with a broken C_(3) symmetry,wherein only the former two of three t_(2g)orbitals(a_(1g),e_(g2)^(π)and e_(g1)^(π))are occupied.The atomic layer thickness and bond angles of monolayer VCl_(3) undergo abrupt changes driven by an orbital ordering switch,resulting in concomitant structural and magnetic phase transitions.Introducing doping to the underlying Cl atoms of monolayer VCl_(3) without C_(3) symmetry simultaneously induces in-and out-of-plane polarizations.This can achieve a multiferroic phase transition if combined with the discovered adjustments of magnetic ground state and polarization magnitude under strain.The establishment of an orbital-ordering driven regulatory mechanism can facilitate deeper exploration and comprehension of magnetic properties of strongly correlated systems in monolayer VCl_(3).

关键词： monolayer symmetry orbital

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Influence of fractures in different inferior orbital wall locations on ocular motility disorders

引用

Chinese Medical Journal 2021年第21期134卷 2632-2634页

作者： Zhi-Gang Li Ying Wang Jun-Bo Rong Li-Juan Lang Li-Min Xu Ke-Xin Guo Lu-Xi Zhang Guang-Ying Zheng Yu Zhu Ophthalmic Center of The First Affiliated Hospital of Zhengzhou University(Henan Ophthalmic Hospital) ZhengzhouHenan 450000China Henan Engineering Research Center for Vision Screening and Prevention in Children ZhengzhouHenan 450000China

orbital floor fractures affect eye movement,but the underlying mechanism remains unclear.Therefore,the present retrospective study aimed to clinically characterize fractures in different inferior.

关键词： motility ocular orbital

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Artificial gauge field switching using orbital angular momentum modes in optical waveguides

引用

Light(Science & Applications) 2020年第1期9卷 577-583页

作者： Christina Jorg Gerard Queralto Mark Kremer Gerard Pelegri Julian Schulz Alexander Szameit Georg von Freymann Jordi Mompartand Veronica Ahufinger Physics Department and Research Center OPTIMAS Technische Universitat Kaiserslautern67663 KaiserslauternGermany Departament de Fisica Universitat Auto’noma de BarcelonaE-08193 BellaterraSpain Institut fur Physik Universitat RostockAlbert-Einstein-StraBe 2318059 RostockGermany Department of Physics and SUPA University of StrathclydeGlasgow G40NGUK Fraunhofer Institute for Industrial Mathematics ITWM 67663 KaiserslauternGermany

The discovery of artificial gauge fields controlling the dynamics of uncharged particles that otherwise elude the influence of standard electromagnetic fields has revolutionised the field of quantum simulation.Hence,developing new techniques to induce these fields is essential to boost quantum simulation of photonic structures.Here,we experimentally demonstrate the generation of an artificial gauge field in a photonic lattice by modifying the topological charge of a light beam,overcoming the need to modify the geometry along the evolution or impose external fields.In particular,we show that an effective magnetic flux naturally appears when a light beam carrying orbital angular momentum is injected into a waveguide lattice with a diamond chain configuration.To demonstrate the existence of this flux,we measure an effect that derives solely from the presence of a magnetic flux,the Aharonov-Bohm caging effect,which is a localisation phenomenon of wavepackets due to destructive interference.Therefore,we prove the possibility of switching on and off artificial gauge fields just by changing the topological charge of the input state,paving the way to accessing different topological regimes in a single structure,which represents an important step forward for optical quantum simulation.

关键词： gauge momentum orbital

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Continuous B scan ultrasound guided post-traumatic sub-periosteal orbital hematoma drainage: An advantage over routine needle drainage procedure

引用

World Journal of Emergency Medicine 2019年第4期10卷 248-250页

作者： Amar Pujari Pallavi Singh Ayushi Sinha Shreya Nayak MANDeep S.Bajaj Rajendra Prasad Centre for Ophthalmic Sciences All India Institute of Medical Sciences

Dear editor,Traumatic orbital haemorrhage is an unfortunate complication with potential vision-threatening consequences.[1-3]The collection of blood can occur anywhere along the potential free orbital spaces,[4]but the subperiosteal collection of the blood is an important clinical variant where careful and timely intervention can give commendable rewards to the surgeon as well as to the patient.[1,2]Subperiosteal hematoma could be traumatic or non-traumatic,in turns,the non-traumatic cases may be due to bleeding tendency as in cases of leukaemia.

关键词： Traumatic orbital haemorrhage unfortunate complication consequences

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Modulation of orbital angular momentum on the propagation dynamics of light fields

引用

Frontiers of Optoelectronics 2019年第1期12卷 69-87页

作者： Peng LI Sheng LIU Yi ZHANG Lei HAN Dongjing WU Huachao CHENG Shuxia QI Xuyue GUO Jianlin ZHAO MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions and Shaanxi Key Laboratory of Optical Information TechnologySchool of ScienceNorthwestern Polytechnical UniversityXi’an 710072China

Optical vortices carrying orbital angular momentum(OAM)have attracted extensive attention in recent decades because of their interesting applications in optical trapping,optical machining,optical communication,quantum information,and optical microscopy.Intriguing effects induced by OAMs,such as angular momentum conversion,spin Hall effect of light(SHEL),and spin– orbital interaction,have also gained increasing interest.In this article,we provide an overview of the modulations of OAMs on the propagation dynamics of scalar and vector fields in free space.First,we introduce the evolution of canonical and noncanonical optical vortices and analyze the modulations by means of local spatial frequency.Second,we review the Pancharatnam–Berry(PB)phases arising from spin–orbital interaction and reveal the control of beam evolution referring to novel behavior such as spindependent splitting and polarization singularity conversion.Finally,we discuss the propagation and focusing properties of azimuthally broken vector vortex beams.

关键词： orbital angular momentum polarization spin angular momentum Pancharatnam-Berry (PB) phase angular diffraction

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：