Y1−xCexMnO3 (x = 0.0, 0.05, 0.10) manganites, were investigated to correlate structural distortion, defect chemistry, and multifunctional properties. Rietveld-refinement confirms the retention of the hexagonal P63cm structure upon Ce doping, accompanied by anisotropic lattice distortion, increased crystallite size, and microstrain. XPS indicates the coexistence of Ce3+/Ce4+ and Mn3+/Mn4+ mixed-valence states along with oxygen vacancies. Optical band gap reduced from 1.42 to 1.36 eV with increasing Ce content, suggesting defect-induced band tailing. Magnetic measurements reveal a suppression of the Néel temperature from ∼72 K to 56 K, which indicates short-range ferromagnetic correlations. Curie-Weiss analysis demonstrates a reduction in antiferromagnetic interaction and magnetic frustration, confirming a transition toward a magnetically inhomogeneous state. Isothermal magnetization supports the coexistence of competing antiferromagnetic superexchange and ferromagnetic double-exchange interactions. Bound magnetic polaron analysis suggests defect-mediated magnetic clustering upon Ce substitution. Moreover, 10% Ce doped YMnO3, achieving ∼79% methylene blue degradation within 180 min compared to ∼45% for YMnO3. These results provide important insights into the development of advanced oxide materials for optoelectronic and water remediation applications.
Although, the influence of the base-isolation (BI) system on the structural performance of building structures is well understood, but the influence of the soil-structure interaction (SSI) on the performance of the BI buildings is remains unclear. Additionally, rapid urbanization, the increasing rate of building construction, and the frequent occurrence of seismic events necessitate the investigation of the frequency-dependent behavior of typical urban building infrastructures equipped with seismic control systems such as base isolation (BI). The present study investigates the effect of the BI system on the seismic performance of low-, intermediate-, and high-rise base-isolated shear buildings considering the SSI. Three different buildings typically found in urban areas with different fundamental structural frequency are considered in the numerical investigation. For a comprehensive study of the earthquake on the building structures with different height (low-rise, intermediate-rise and high-rise buildings), the earthquake records are classified as low-intermediate- and high-frequency earthquakes. The numerical modelling of the building structures is done using lumped-mass model and the parameters of the linearized equivalent BI system are integrated into the model, considering that the BI system behaves like the bottom story of the structural system. For this study, the interaction between the soil and foundation is represented using springs and dashpots considering sway and rocking inertial responses. The seismic responses are compared between isolated and non-isolated cases, considering SSI and non-SSI conditions separately. It is found that, the SSI significantly affects the seismic response of each category of considered building structures, independent of isolated or non-isolated cases. Additionally, the sensitiveness of different types of buildings to different frequency-content earthquake is evident for both isolated and non-isolated scenarios. For all the considered earthquakes, the efficiency of the BI system is observed to be overestimated when SSI effect is neglected.
Let D be a quaternion division algebra over a non-Archimedean local field F of characteristic zero, and let Gn=GLn(D). Let H1,n−1 denote the subgroup of Gn consisting of block-diagonal matrices of the form diag(g1,g2), where g1∈G1 and g2∈Gn−1. In this article, we classify all irreducible smooth H1,n−1-distinguished representations of Gn for n=3 and 4. Furthermore, we conjecture that an irreducible smooth representation π of Gn, for n>2, is H1,n−1-distinguished if and only if either π is a trivial representation or it is parabolically induced from the trivial representation of Gn−2 and an infinite-dimensional irreducible H1,1-distinguished representation of G2.
Multimodal imaging integrates complementary contrasts to improve the understanding of physiological processes and disease progression. In this review, we aim to summarize and critically assess the integration of optoacoustic microscopy (OAM) with established ultrasound-based and optical microscopy-based modalities, addressing how these hybrid systems enhance structural, functional, and molecular imaging across biomedical applications. A comprehensive literature review was conducted focusing on OAM-based multimodal microscopy platforms integrated with ultrasound microscopy and optical techniques, including optical coherence tomography, fluorescence microscopy, multiphoton microscopy, light-sheet microscopy, and Raman spectroscopy. Emerging strategies such as integration with quantitative phase imaging and advanced signal processing approaches, including the multiple signal classification algorithm, were also examined. Studies were analysed with respect to system design, image co-registration and fusion strategies, and application domains including oncology, dermatology, ophthalmology, and neuroscience. Multimodal OAM platforms demonstrated enhanced imaging performance by combining high optical contrast with improved penetration depth and functional sensitivity. These systems enabled detailed visualization of oxygenation, tumor angiogenesis, skin microarchitecture, retinal structures, and neuronal activity. Comparative analysis revealed trade-offs and synergies among modalities in terms of spatial resolution, penetration depth, frame rate, and field-of-view, highlighting the advantages of hybrid configurations over single-modality approaches. Hybrid OAM-based multimodal microscopy provides a powerful framework for comprehensive biomedical imaging. By leveraging complementary contrasts and advanced image fusion strategies, these platforms hold strong potential to advance both fundamental research and translational clinical applications.
Follower activity results in a large variety of conformational and dynamical states in active chains and filaments. These states are formed due to the coupling between chain geometry and the local activity. We study the origin and emergence of such patterns in noiseless, flexible active chains. In the overdamped limit, we observed a range of dynamical steady states for different chain lengths (N). The steady-state planar trajectories of the center of mass of the chain include circles, periodic waves, and quasiperiodic, bound trajectories resembling spirographic patterns. In addition, out-of-plane initial configuration also leads to the formation of three-dimensional structures, including globular and supercoiled helical structures. For the shortest chain with three segments (N=3), the chain always moves in a circular trajectory. Such circular trajectories are also observed in the limit of large chain lengths (N≫1). We analytically study the dynamical patterns in these two limiting cases, which show quantitative and qualitative matches with numerical simulations. Our analytical study also provides an estimate of the limiting N where the large-chain-length behavior is expected. These analyses reveal the existence of such intricately periodic patterns in active chains, arising due to the follower activity.
