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In this paper, the focusing and tight-focusing properties of radially polarized (RP) Bessel-Gaussian (BG) rotationally-symmetric power-exponent-phase vortex beam (RPVBs) were investigated theoretically and experimentally. Based on the theory of vector beam, the propagation and tight-focusing models were derived to reveal the focusing and tight-focusing properties of the RP-BG-RPVBs by numerical simulation. Then, the experimental setup was established to validate that the RP-BG-RPVBs presented the fan-shaped and polycyclic intensity distribution, which possessed the features of RP beams, BG beams, and RPVBs, similarly.
View Article and Find Full Text PDFAssessing sign language comprehension in adults with intellectual disability and deafness.
J Deaf Stud Deaf Educ
January 2025
Institute of Neurology of Senses and Language, Hospital of St. John of God Linz, Linz, Austria.
Language comprehension is an essential component of human development that is associated not only with expressive language development and knowledge acquisition, but also with social inclusion, mental health, and quality of life. For deaf and hard-of-hearing adults with intellectual disability, there is a paucity of measures of receptive sign language skills, although these are a prerequisite for individualized planning and evaluation of intervention. Assessments require materials and procedures that are accurate, feasible, and suitable for low levels of functioning.
View Article and Find Full Text PDFAsymmetric electronic distribution induced enhancement in photocatalytic CO-to-CH conversion via boron-doped covalent triazine frameworks.
J Colloid Interface Sci
January 2025
Department of Environmental Science and Engineering, Fuzhou University, Minhou, Fujian 350108, China; State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Minhou, Fujian 350108, China. Electronic address:
Covalent triazine frameworks (CTFs) are emerging as promising platform for photocatalysis, yet their highly symmetric structure leads to significant charge recombination. Herein, we employed a facile non-metallic boron (B) modification with precisely controlled doping site to introduce asymmetric local electron distribution in CTFs, achieving a 15-fold activity enhancement for CO-to-CH conversion. Calculations including frontier orbitals, dipole moments and molecular electrostatic potentials firmly demonstrated the formation of localized polarized electron regions in CTF-1 via B doping.
View Article and Find Full Text PDFNumerical Simulations of Single-Step Holographic Interferometry for Split-Ring Metamaterial Fabrication.
Nanomaterials (Basel)
January 2025
School of Physics and Optoelectronics, South China University of Technology, Guangzhou 510640, China.
Artificial microstructures, especially metamaterials, have garnered increasing attention in numerous applications due to their rich and distinctive properties. Starting from the principle of multi-beam interference, we have theoretically devised a beam configuration consisting of six symmetrically distributed coherent beams to generate two-dimensional microstructures with diverse shapes of unitcells under different polarization combinations. In particular, a split-ring metamaterial template is achieved with two adjacent circularly and four linearly polarized beams with such single-step holographic interferometry.
View Article and Find Full Text PDFA Simple Wide Range Approximation of Symmetric Binomial Distribution.
Entropy (Basel)
December 2024
Department of Stochastics, Institute of Mathematics, Budapest University of Technology and Economics, Muegyetem rkp. 3, H ep, 5 em, 1521 Budapest, Hungary.
The paper gives a wide range, uniform, local approximation of symmetric binomial distribution. The result clearly shows how one has to modify the classical de Moivre-Laplace normal approximation in order to give an estimate at the tail as well as to minimize the relative error.
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