Article
Physics, Condensed Matter
M. F. C. Martins Quintela, N. M. R. Peres
Summary: This paper investigates the behavior of Wannier excitons in hexagonal boron nitride quantum dots, examining the influence of quantum dot dimensions on the excitonic states.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Computer Science, Software Engineering
Lukas Hruda, Ivana Kolingerova, Miroslav Lavicka, Martin Manak
Summary: This paper proposes a method using approximate reflectional symmetries to derive plausible approximate rotational symmetries, which can be integrated with reflectional symmetry detection methods. A quaternion-based parameterization of the rotation transformation is used to provide a robust and efficient solution for finding rotational symmetry in a 3D point set.
COMPUTER AIDED GEOMETRIC DESIGN
(2022)
Article
Engineering, Multidisciplinary
Dakshata Panchal, Deepak Jayaswal
Summary: This research proposes a surface remeshing framework that aims to balance key goals in remeshing for improved quality. The framework achieves this by using local edge operators for mesh decimation, enhancing element quality, and regularizing vertex valence. The approach also ensures feature preservation and geometric fidelity with the original mesh. Compared to recent approaches, the remeshing framework produces efficient and high-quality remeshes.
SADHANA-ACADEMY PROCEEDINGS IN ENGINEERING SCIENCES
(2022)
Article
Optics
Miaoxia Yan, Jing Li, Xuehui Wang, Li Pei, Tigang Ning, Jingjing Zheng, Jianshuai Wang
Summary: An asymmetry tunable triangular waveform photonic generator based on channelized frequency synthesis is proposed and studied in this paper. The generator adopts a multichannel system architecture and harmonic amplitude control algorithm to physically isolate each subchannel. In a single subchannel, quadrature phase shift keying modulation and coherent dual-wavelength balanced detection are used to realize optical upconversion and suppress mixing interference in the process of frequency conversion. The feasibility of the scheme is verified by optical simulation, and a tunable symmetry triangular waveform can be obtained within a certain range.
Article
Physics, Multidisciplinary
Khaled Abuhmaidan, Monther Aldwairi, Benedek Nagy
Summary: Vector arithmetic serves as a foundation for various disciplines including geometry and physics. The triangular grid, although regular, poses a challenge because it is not closed under vector addition. Restrictions are placed when expanding the system to the plane, but vector arithmetic remains complex in certain scenarios.
Article
Chemistry, Physical
Xiang Li, Haotian Zheng, Yan Xue, Zhenghua Li, Xiaojuan Zhu, Xianhong Da, Ruonan Li, Yunshu Lu, Yan Liu, Fenfen Gu
Summary: Uniform hexagonal hematite nanoplates were prepared via alcohol-thermal reaction, with ideal morphology achieved by adjusting reaction time slightly; magnetite nanoplates were obtained through reduction process, with the phase transition from alpha-Fe2O3 to Fe3O4 detected by XPS. The magnetic properties of these nanoplates showed higher coercivity and lower saturation magnetization compared to other nanostructured iron oxides, potentially due to surface adsorption of nonmagnetic materials.
RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A
(2021)
Article
Mathematics, Applied
Christian Lange, Tobias Soethe
Summary: We prove that suitably defined systolic ratios have a global upper bound on rotationally symmetric spindle orbifolds, which is attained precisely at Besse metrics. We consider two types of systolic ratios, one based on closed geodesics lifting to contractible loops on certain covers of the unit sphere bundle, and the other based on the kth shortest closed geodesic where k depends on the underlying orbifold. Our results generalize previous results for spheres of revolution and complement recent results on local systolic inequalities for Besse Reeb flows on closed 3-manifolds.
JOURNAL OF FIXED POINT THEORY AND APPLICATIONS
(2023)
Review
Chemistry, Multidisciplinary
Lena C. Mayer, Simone Heitsch, Oliver Trapp
Summary: Asymmetric synthesis is a crucial technique for the preparation of chiral compounds and the control of stereocenters in complex syntheses. Configurationally flexible ligands and catalysts can be enriched through dynamic processes, leading to improved enantioselectivity in asymmetric catalysis. This strategy has significant implications for the development of new catalytic applications and understanding of chirality amplification and homochirality in biological systems.
ACCOUNTS OF CHEMICAL RESEARCH
(2022)
Review
Chemistry, Multidisciplinary
Lena C. Mayer, Simone Heitsch, Oliver Trapp
Summary: Asymmetric synthesis plays a crucial role in preparing enantiomerically pure compounds and controlling individual stereocenters in complex compound synthesis. It relies on the use of enantiopure catalysts and configurationally flexible ligands or organocatalysts. The design of smart catalyst systems that combine supramolecular recognition, stereoconvergent alignment, and catalysis has been successful in enhancing enantioselectivity in asymmetric catalysis.
ACCOUNTS OF CHEMICAL RESEARCH
(2022)
Article
Engineering, Mechanical
Dabao Fan, Daxing Zeng, Ya Liu, Wenjuan Lu, Yulei Hou, Zirong Zhou, Jianwen Guo
Summary: This study investigates the factors affecting the topology of Rubik's cube mechanism (RCM) and presents a strong synthesis theory that provides theoretical support for the synthesis of other new RCMs.
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
(2022)
Article
Mathematics, Applied
Valentin De Bortoli, Agnes Desolneux, Alain Durmus, Bruno Galerne, Arthur Leclaire
Summary: This paper explores a new framework for exemplar-based image synthesis, utilizing an alternate sampling/minimization scheme. Results show that the method produces a probability measure with maximum entropy under certain constraints, and that even in a nonconvex setting, its error can be explicitly bounded by constants polynomially dependent on the dimension.
SIAM JOURNAL ON MATHEMATICS OF DATA SCIENCE
(2021)
