Article
Physics, Applied
Elnaz Baradaran Shokouhi, Andreas Mandelis
Summary: This paper introduces a theoretical model of pulsed photothermal radiometry based on conduction-radiation theory. The model is applicable to a two-layered medium with different optical and thermal properties from the semi-infinite substrate. The model derives the spatial distribution of the frequency spectrum of the pulsed photothermal signal and matches it to the measured photothermal transients through an inverse Fourier transformation algorithm. Numerical and experimental tests using specific materials were conducted to validate the model.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Environmental Sciences
Yue Han, Tarek N. Aziz, Dario Del Giudice, Nathan S. Hall, Daniel R. Obenour
Summary: Nutrient reductions are more critical than changes in mixing or background turbidity in controlling cyanobacteria in shallow eutrophic freshwater systems. Both models explain around 60% of the variability in chlorophyll-a, but the mechanistic model is more robust and provides a more comprehensive assessment of algal drivers.
ENVIRONMENTAL POLLUTION
(2021)
Article
Chemistry, Physical
Till Domroese, Thomas Danz, Sophie F. Schaible, Kai Rossnagel, Sergey V. Yalunin, Claus Ropers
Summary: The authors discovered a transient hexatic state during the laser-induced transformation between two charge-density wave (CDW) phases in the CDW material 1T-TaS2. The ability to control material properties using light holds great potential for future applications in energy conversion and information technology. Strongly correlated materials such as transition metal dichalcogenides allow for optical control of electronic phases, charge ordering, and interlayer correlations through photodoping.
Article
Chemistry, Multidisciplinary
Chantalle J. Krajewska, Sean R. Kavanagh, Lina Zhang, Dominik J. Kubicki, Krishanu Dey, Krzysztof Galkowski, Clare P. Grey, Samuel D. Stranks, Aron Walsh, David O. Scanlon, Robert G. Palgrave
Summary: The paper investigates the substitution of Bi(iii) ions with Sn(ii) and Sn(iv) in the synthesis of Cs3Bi2Br9 by adding SnBr2. The mixed-valence compounds show intense visible and near-infrared absorption, and exhibit minimal changes in properties after long-term storage. The stability of Sn(ii) within the double substitution complex is found to contribute to the unusual stability of the material.
Article
Mathematics, Applied
Liyan Pang, Shi-Liang Wu
Summary: This paper investigates the spreading properties of a reaction-diffusion equation in a cylinder with partially exponentially unbounded initial conditions. It is proven that the level sets of the solutions move infinitely fast as time approaches infinity, and that the locations of the level sets are determined by the maximum initial values in the y direction.
APPLIED MATHEMATICS LETTERS
(2022)
Article
Physics, Applied
Wan Chen, Jiahui Fu, Qun Wu
Summary: This article introduces a technique for increasing the directivity of a superdirective antenna by using a complex excitation source, specifically choosing the Huygens source for its zero-back-lobe characteristic. By applying this method, the directivity of the multi-layered cylinder was increased by 20% compared to previous designs, resulting in an extremely small back-lobe. Unlike other proposed designs focusing on material optimizations, this approach prioritizes the form of the excitation, providing a novel method for improving the performance of superdirective antennas.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Mechanics
A. Douhou, S. Ramtani
Summary: This paper discusses the modeling of steady fluid diffusion and solid large deformation in a fibrous two-layer thick-walled hollow cylinder using the mechanics of interacting continua. By assuming a perfect interface between the two layers and considering the properties of a rubber-fluid mixture, new results regarding pressure difference and stress distribution are obtained. These findings could potentially contribute to the understanding of de-stiffening therapy and the design of prosthetic conduits for living tissue.
INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS
(2023)
Article
Physics, Condensed Matter
W. Schirmacher, G. Ruocco
Summary: We establish a connection between the Kubelka-Munk equations and the one-dimensional diffusion equation that describes the intensity transfer of light in turbid media. By averaging the three-dimensional diffusion equation over the lateral directions, we can uniquely determine the Kubelka-Munk parameters and derive expressions for diffuse reflection and transmission coefficients, accounting for the effect of internal reflections. The Kubelka-Munk equations are shown to be the appropriate radiative-transfer equations for the one-dimensional diffusion problem.
CONDENSED MATTER PHYSICS
(2023)
Article
Optics
Zheng Yang, Yuqiong Cheng, Neng Wang, Yuntian Chen, Shubo Wang
Summary: We investigate the nonreciprocal properties of light propagation in a dielectric waveguide induced by a subwavelength spinning cylinder. We find that the chiral modes of the cylinder can result in unidirectional coupling with the waveguide via the transverse spin-orbit interaction, leading to different transmissions for guided waves propagating in opposite directions and therefore achieving optical isolation. The nonreciprocal properties depend on various system parameters including mode order, spinning speed, coupling distance, and losses. Higher-order chiral modes and larger spinning speed generally contribute to stronger nonreciprocity, and there exists an optimal cylinder-waveguide coupling distance for maximum optical isolation. The results provide insights into the understanding of nonreciprocity in subwavelength moving structures and have potential applications in integrated photonic circuits, topological photonics, and novel metasurfaces.
Article
Materials Science, Multidisciplinary
Zhaoqiang Song, Xu Li, Kaijin Wu, Shengqiang Cai
Summary: In this article, a non-equilibrium thermodynamic theory for case II diffusion in glassy polymers is formulated. The model integrates the three-dimensional elasto-visco-plasticity, the Flory-Rehner theory for polymer network swelling, and the kinetics law for solvent migration with concentration-dependent diffusivity. The theory is given in a general 3D tensorial form, which can be used to model case II diffusion in glassy polymers with arbitrary geometries and different mechano-chemical loading conditions. The developed theory may provide important guidance for the design of semi-permeable membranes, waterproof coatings, and drug delivery systems, where case II diffusion commonly occurs.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)
Article
Optics
Jing Han, Yan Liu, JInjia Guo, Qinfeng Xu
Summary: This paper proposes an instability-driven nonlinear imaging method based on polarization modulation, which effectively recovers high-quality images from scattered signals.
Article
Environmental Sciences
Yong Luo, Lintao Huang, Xinming Lei, Xiaolei Yu, Chengyue Liu, Lei Jiang, Youfang Sun, Meng Cheng, Jianfeng Gan, Yuyang Zhang, Guowei Zhou, Sheng Liu, Jiansheng Lian, Hui Huang
Summary: Recent research suggests that underwater light availability plays a crucial role in the growth and distribution of reef-building corals exposed to elevated suspended solids. This study investigated the variations in light availability, coral assemblages, and suspended solids concentrations and composition on the Luhuitou fringing reef in Sanya, China. The results showed that light availability is related to the distribution and growth of different coral species, and that the organic fraction of suspended solids plays a significant role in light attenuation.
MARINE ENVIRONMENTAL RESEARCH
(2022)
Article
Physics, Applied
Tibebe Birhanu, Yoseph Abebe, Lemi Demeyu, Mesfin Taye, Mulugeta Bekele
Summary: This paper presents a device that amplifies weak signals by utilizing existing background noise, and describes the structure and operation principle in detail. The performance of the device is validated through theoretical calculations and simulations for various parameter values, showing good agreement between the two approaches.
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
(2021)
Article
Engineering, Civil
Dajun Yuan, Weiping Luo, Dalong Jin, Ping Lu
Summary: This study investigates hydrofracturing in double-layered soil through theoretical and experimental analysis, finding a linear relationship between fracturing pressure and confining pressure in concentric double-layered cohesive soil. The presence of internal soil can both weaken or strengthen the fracturing pressure, depending on the relative hardness of the soil layers. The proposed solution may be useful for geotechnical problems involving cohesive soil layering in composite formations.
FRONTIERS OF STRUCTURAL AND CIVIL ENGINEERING
(2021)
Article
Physics, Applied
Shiyang Liang, Koichi Shimizu
Summary: A technique for noninvasive evaluation of turbidity in subcutaneous blood vessels was developed, which estimates reduced scattering coefficient through a differential principle. The technique demonstrates high sensitivity and robustness, expanding the applicability to human blood and improving sensitivity by over 50 times compared to traditional methods.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2021)
