Article
Chemistry, Analytical
Falih M. Alnahwi, Yasir I. A. Al-Yasir, Chan Hwang See, Abdulkareem S. Abdullah, Raed A. Abd-Alhameed
Summary: This paper presents a generalized concept, algorithm, and MATLAB code that provide the exact modeling equations of the transmission parameters and the scattering parameters of any 90 degrees wideband stub-loaded phase shifter. The proposed code can be tailored to any number of stubs and characteristic impedance value, and illustrates the results as a function of normalized frequency.
Article
Engineering, Electrical & Electronic
Shanglin Li, Mohammadreza Sanadgol Nezami, Odile Liboiron-Ladouceur
Summary: This paper derives closed-form analytical expressions for power coupling coefficients of Laguerre-Gaussian beams into graded-index fibers, which can be applied to manufactured fibers with index exponent parameters from 1.8 to 2.2, significantly reducing computation time compared to conventional numerical methods.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Biology
Meng Xu, Philip T. Reiss, Ivor Cribben
Summary: This study introduces a new distance-based ICC (dbICC) to assess reliability for new types of data. A bias correction is proposed to improve coverage of bootstrap confidence intervals for the dbICC. The efficacy of the method is demonstrated through simulation and the Spearman-Brown formula is extended to encompass the dbICC.
Article
Chemistry, Physical
Suraj S. Chandran, Yanze Wu, Hung-Hsuan Teh, David H. Waldeck, Joseph E. Subotnik
Summary: This study investigates a spin-boson inspired model of electron transfer, showing that equilibrium results are invariant to the sign of coupling to infinite order, while nonequilibrium results do depend on the coupling sign, indicating possible electronic spin polarization.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Physics, Mathematical
Wei-Kuo Chen, Dmitry Panchenko, Eliran Subag
Summary: In this study, the generalized TAP approach was used for mixed p-spin models with Ising spins at positive and zero temperature, showing that the energy of states at a given distance from the origin is the same. The study also demonstrated analogues of positive temperature results at zero temperature regarding ground-state energy and configurations in space.
COMMUNICATIONS IN MATHEMATICAL PHYSICS
(2021)
Article
Engineering, Electrical & Electronic
E. Hannachi, Y. Slimani, M. I. Sayyed, K. G. Mahmoud
Summary: A new ceramic-based material containing barium tungstate-doped with different amounts of holmium oxide (Ho2O3) was proposed as a γ-radiation shield. Structural and optical studies were performed, and radiation attenuation coefficients were determined using the Monte Carlo simulation. The results showed that the material had a scheelite structure, and the radiation shielding coefficients decreased with increasing Ho2O3 concentration.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2023)
Article
Physics, Nuclear
Volodymyr Vovchenko
Summary: This paper introduces the SAM-2.0 method, which corrects the cumulants of a random number distribution within a subsystem by considering the effect of a conserved quantity. It is applicable to measurements of event-by-event fluctuations in heavy-ion collisions, bringing experimental measurements closer to theoretical calculations.
Article
Physics, Multidisciplinary
Victor Kac, Johan van de Leur
Summary: The first part of the paper presents two descriptions of all polynomial tau-functions of the Kadomtsev-Petviashvili (KP) hierarchy: a generalized Jacobi-Trudi formula and a generalized Giambelli formula. In the second part, the latter formula is used to obtain all polynomial tau-functions of the CKP hierarchy and its n-reductions. Specifically, for n=3...
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2023)
Article
Engineering, Civil
Xiaojun Fang, Kaiming Bi, Hong Hao, Yun Zhou, Zhangyan Chen, Yongsheng Cao
Summary: This paper introduces a novel lead-viscoelastic coupling beam damper (LVCBD), which has frequency independence, fatigue resistance, and stable energy dissipation. Numerical studies are conducted to investigate the effects of lead rod number and lead rod diameter on the hysteretic behaviors of the LVCBD. Theoretical formulas are derived, and a genetic algorithm is used to develop a hysteretic model to depict the behavior of the LVCBD. The properly designed LVCBD with four lead rods exhibits a favorable shear-bearing capacity with uniform stress distribution.
Article
Chemistry, Multidisciplinary
Xin Long, Xiongbang Wei, Yuhong Qiu, Ming Jiang, Zhi Chen, Yaochen Song, Linnan Bi, Jianming Wang, Sizhe Wang, Jiaxuan Liao
Summary: Lead zirconate titanate (PZT) aerogels were used to synthesize a novel piezoelectric composite with excellent properties, which shows promising application prospects in underwater acoustic transducers (UATs).
CHEMICAL COMMUNICATIONS
(2021)
Article
Mathematics, Applied
Yadong Shang, Quting Chen
Summary: This paper investigates a generalized Burgers-Fisher equation, showing that it can be linearized under certain conditions and obtaining a Backlund transformation with a linear equation. A generalized Cole-Hopf transformation between the gvc Burgers-Fisher equation and linear heat conduction equation is derived using an unknown function transformation. Ultimately, a series of explicit exact solutions for the equation are obtained.
APPLIED MATHEMATICS LETTERS
(2021)
Article
Optics
Florian Fuchs, Christian Vedder, Jochen Stollenwerk, Peter Loosen
Summary: The temperature-dependent optical properties of PECVD deposited amorphous silicon films were investigated, with heating rates over 2300 K/s used to shift the onset of solid-phase crystallization above 1110 K for examination. The study includes details on the experimental setup, procedure, simulation methods, and material-specific data.
Article
Mathematics, Applied
Chenkuan Li
Summary: The paper extends the fractional Laplacian to the space C-k(R-n) for all s > 0 and s not equal to 1, 2, ..., using normalization in distribution theory, Pizzetti's formula, and surface integrals. It presents two theorems showing the continuity of the extended fractional Laplacian at the end points and provides two illustrative examples using special functions, Cauchy's residue theorem, and integral identities. Additionally, an application to defining the Riesz derivative at odd numbers is considered.
FRACTIONAL CALCULUS AND APPLIED ANALYSIS
(2021)
Article
Neurosciences
Jie Hu, Haifeng Ran, Guiqin Chen, Yulun He, Qinghui Li, Junwei Liu, Fangling Li, Heng Liu, Tijiang Zhang
Summary: This study investigated the presence of neurovascular decoupling in childhood idiopathic generalized epilepsy (IGE) using resting-state fMRI and arterial spin labeling imaging. The results showed altered neurovascular coupling in children with IGE, which was associated with lower performance intelligence quotient scores. This study shed new light on the pathophysiology of epilepsy and provided potential imaging biomarkers for cognitive performances in children with IGE.
CNS NEUROSCIENCE & THERAPEUTICS
(2023)
Article
Automation & Control Systems
Jason J. R. Liu, James Lam, Xiaochen Xie, Zhan Shu
Summary: This article extends lead, lag, and lead-lag compensators to multi-input-multi-output systems for the first time, while also providing algorithmic design methods that are more systematic compared to traditional approaches.
IEEE TRANSACTIONS ON SYSTEMS MAN CYBERNETICS-SYSTEMS
(2021)
Article
Physics, Multidisciplinary
Lucas J. Fernandez-Alcazar, Rodion Kononchuk, Huanan Li, Tsampikos Kottos
Summary: By utilizing Floquet driving protocols and carefully engineered reservoir emission, extreme nonreciprocal thermal radiation is achieved. The nonreciprocity arises from the interaction between direct radiation due to temperature bias and modulation process responsible for pumped radiation heal. The theoretical results are confirmed through time-domain simulations with photonic and rf circuits.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Huanan Li, Ahmed Mekawy, Andrea Alu
Summary: The study proposes a new pathway for PT symmetry using the evanescent field excitation of anti-PT-symmetric structures, demonstrating an important link between non-Hermitian physics and near-field interactions with implications in nanophotonics, plasmonics, and acoustics for applications in nanoimaging, sensing, and communications.
PHYSICAL REVIEW LETTERS
(2021)
Article
Nanoscience & Nanotechnology
Lucas J. Fernandez-Alcazar, Huanan Li, Mona Nafari, Tsampikos Kottos
Summary: This study implemented the concept of thermal radiation pumps in realistic photonic circuits and demonstrated their efficiency in controlling radiation current. By cyclic adiabatic modulation of parameters in the photonic circuit, maximum radiation current can be achieved. A developed Floquet scattering framework offers an engineering tool for designing and predicting the performance of such thermal pumps.
Article
Optics
Zi-Lan Deng, Feng-Jun Li, Huanan Li, Xiangping Li, Andrea Alu
Summary: Coupled resonances in non-Hermitian systems can be used to achieve extreme control over diffraction orders and tailor the overall spectral response, enabling control over singular features.
LASER & PHOTONICS REVIEWS
(2022)
Article
Physics, Multidisciplinary
Huanan Li, Shixiong Yin, Andrea Alu
Summary: This study demonstrates nonreciprocity for temporal boundaries by showing Faraday polarization rotation in a magnetoplasma with abruptly switched material properties. The findings open new opportunities for time metamaterials and wave engineering.
PHYSICAL REVIEW LETTERS
(2022)
Article
Thermodynamics
Yong-Mei Zhang, Mauro Antezza, Jian-Sheng Wang
Summary: The presence of interlayer interactions in twisted bilayer graphene (TBG) enhances several characteristics, including the optical and electronic properties. A series of double magic angles have been theoretically investigated in TBG. The thermal radiation from TBG can be tuned to the far infrared range by changing twist angles.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Physics, Applied
Huan He, Sihao Zhang, Jiwei Qi, Fang Bo, Huanan Li
Summary: Researchers have introduced nonreciprocal photonic time-crystals (NPTCs) by periodically switching the material properties of a spatially homogeneous magnetoplasma medium in time, enabling temporal Faraday rotation in both momentum bands and (partial) bandgaps. By combining the bandgaps of the NPTCs, the temporal Faraday effect can be utilized to create a unidirectional wave amplifier through energy extraction from modulation.
APPLIED PHYSICS LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Hangbo Zhou, Gang Zhang, Jian-Sheng Wang, Yong-Wei Zhang
Summary: We investigate the anharmonic phonon scattering across a weakly interacting interface and find that the contribution from anharmonic three-phonon scatterings can be described by a temperature-dependent Landauer formula. Surprisingly, in the weak coupling limit, the transmission due to anharmonic phonon scattering increases indefinitely with temperature, which is not the case for two-phonon processes. We further reveal that anharmonic effects dominate over harmonic processes even at room temperature in real heterogeneous interfaces, emphasizing the importance of anharmonicity in weakly interacting systems.
Article
Physics, Multidisciplinary
Huanan Li, Shixiong Yin, Huan He, Jingjun Xu, Andrea Alu, Boris Shapiro
Summary: Time metamaterials, including anisotropic photonic time crystals, have shown promising potential for wave manipulation. In this study, we investigate the unique wave dynamics of an anisotropic photonic time crystal formed by a periodically changing anisotropic medium. We demonstrate that a stationary charge embedded in the time crystal emits radiation, contrary to isotropic photonic time crystals, and its momentum distribution is controlled by the time crystal's band structure. This work expands the functionalities of time metamaterials and opens up new possibilities for radiation generation and control, with implications in classical and quantum applications.
PHYSICAL REVIEW LETTERS
(2023)
Review
Physics, Multidisciplinary
Jian-Sheng Wang, Jiebin Peng, Zu-Quan Zhang, Yong-Mei Zhang, Tao Zhu
Summary: This article discusses the description and modeling of transport phenomena in electron systems coupled via scalar or vector photons. It is divided into three parts: scalar photons (Coulomb interactions), transverse photons (described by vector potentials), and the phi = 0 or temporal gauge, which is a complete theory of electrodynamics. The nonequilibrium Green's function (NEGF) formalism is used as a tool to study steady-state transport, with the advantage of going beyond fluctuational electrodynamics (FE) due to its generality. Several examples are provided, including heat transfer between graphene sheets, light emission from a double quantum dot, and emission of energy, momentum, and angular momentum from a graphene nanoribbon. All calculations are based on a generalization of the Meir-Wingreen formula, with materials properties represented by photon self-energy and coupled with the Keldysh equation and the solution to the Dyson equation.
FRONTIERS OF PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Yong-Mei Zhang, Tao Zhu, Zu-Quan Zhang, Jian-Sheng Wang
Summary: We have developed a general microscopic theory for the transfer of energy, momentum, and angular momentum mediated by photons. Using the nonequilibrium Green's function method, we have proposed a unified formalism for describing the energy emitted, force experienced, and torque experienced by objects due to fluctuating electromagnetic fields. Our theory does not rely on the assumption of local thermal equilibrium and is applicable to arbitrary objects and non-reciprocal environments. By applying our theory to transport problems of graphene edges, we have demonstrated its capability and shown results that go beyond the predictive ability of conventional theories.
Review
Optics
Emanuele Galiffi, Romain Tirole, Shixiong Yin, Huanan Li, Stefano Vezzoli, Paloma A. Huidobro, Mario G. Silveirinha, Riccardo Sapienza, Andrea Alu, J. B. Pendry
Summary: This review comprehensively discusses the recent progress of time modulation in photonic metamaterials, including temporal switching, photonic time-crystals, and spatiotemporal modulation. It also reviews and provides perspectives on the applications of time modulation in nonreciprocity, synthetic motion, giant anisotropy, etc.
ADVANCED PHOTONICS
(2022)
Article
Materials Science, Multidisciplinary
Kangtai Sun, Zhibin Gao, Jian-Sheng Wang
Summary: The study of Phonon Hall effect (PHE) has garnered significant interest in recent years, with theoretical and experimental investigations published. While experiments focus on complex materials, theoretical research remains centered around phenomenon-based models. By utilizing first-principles calculations, scientists aim to explore PHE in real materials and propose potential directions for future research.
Article
Materials Science, Multidisciplinary
Tao Zhu, Mauro Antezza, Jian-Sheng Wang
Summary: In this work, different theoretical approaches were used to analyze the electronic polarizability of graphene. It was found that the tight-binding method is as effective as the ab initio approach in calculating the polarizability of graphene. The special Dirac-cone band structure of graphene allows the Dirac model to reproduce results of the tight-binding method for energy smaller than 3 eV.
Correction
Materials Science, Multidisciplinary
Jia-Huei Jiang, Jian-Sheng Wang
