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Advanced Materials, EarlyView.The water permeability of amorphous carbon dots (CDs) is demonstrated by investigating their plasticization. Novel polyamide‐based and amorphous nanoparticles are synthesized by controlling their inner packing density. Water plasticization is evidenced by the decrease of the CDs glass transition temperature with increasing the hydration degree.
Elisa Sturabotti +8 more
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Opportunities of Semiconducting Oxide Nanostructures as Advanced Luminescent Materials in Photonics
Advanced Materials, EarlyView.The review discusses the challenges of wide and ultrawide bandgap semiconducting oxides as a suitable material platform for photonics. They offer great versatility in terms of tuning microstructure, native defects, doping, anisotropy, and micro‐ and nano‐structuring. The review focuses on their light emission, light‐confinement in optical cavities, and
Ana Cremades +7 more
wiley +1 more source
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A note on perturbation-adapted perturbation theory
The Journal of Chemical Physics, 2022The partitioning introduced recently by Knowles [J. Chem. Phys. 156, 011101 (2022)] is analyzed and its connections with the Adams partitioning and the Davidson–Kapuy partitioning are discussed. Davidson’s partitioning is reformulated using the second quantized formalism.
Péter R. Surján +2 more
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The Journal of Chemical Physics, 2015
Despite the fundamental importance of electron density in density functional theory, perturbations are still usually dealt with using Hartree-Fock-like orbital equations known as coupled-perturbed Kohn-Sham (CPKS). As an alternative, we develop a perturbation theory that solves for the perturbed density directly, removing the need for CPKS.
Mark C. Palenik, Brett I. Dunlap
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Despite the fundamental importance of electron density in density functional theory, perturbations are still usually dealt with using Hartree-Fock-like orbital equations known as coupled-perturbed Kohn-Sham (CPKS). As an alternative, we develop a perturbation theory that solves for the perturbed density directly, removing the need for CPKS.
Mark C. Palenik, Brett I. Dunlap
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American Journal of Physics, 1954
Perturbation theory is derived in such a way that the wave function renormalization terms appear automatically. The derivation is based on the Feynman theorem for the rate of change of an eigenvalue with respect to a parameter, and a corresponding theorem for the rate of change of an eigenfunction.
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Perturbation theory is derived in such a way that the wave function renormalization terms appear automatically. The derivation is based on the Feynman theorem for the rate of change of an eigenvalue with respect to a parameter, and a corresponding theorem for the rate of change of an eigenfunction.
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On the status of perturbation theory
Mathematical Structures in Computer Science, 2007Perturbation theory has always been an important component of the natural sciences. From celestial mechanics to the quantum theory of fields, it has always played a central role, which this little note sets out to analyse briefly. We will show, in particular, how its epistemological position has changed from being just a ‘tool’ to being the basis of ...
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Perturbation theory of antiferromagnetism
Physica, 1960Abstract An expansion in terms of connected diagrams is derived for the partition function of an antiferromagnetic spin system with isotropic exchange Hamiltonian. It is shown that the series can be obtained as a perturbation over the Neel theory.
Mills, R. L., Kenan, R. P., Korringa, J.
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Perturbation theory for odd perturbations
Journal of Physics A: General Physics, 1972The eigenvalues of perturbed Schrodinger equation with an odd perturbation are even functions of the perturbation parameter lambda . It is shown how to transform the perturbed equation so that the new perturbation is also explicitly an even function of lambda .
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The Development of Perturbation Theory at GALCIT
SIAM Review, 1994After a short historical survey of the foundation of the California Institute of Technology (Caltech), the author analyzes the major studies published, starting with 1948. Consequently, the initiative of Paco Lagerstrom (to whom the presentation is actually dedicated), of a systematic study of the laminar solutions of the Navier-Stokes equations ...
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2019
This chapter examines applications drawn from perturbation theory. The main topic in perturbation theory is the energy and spontaneous decay rate of the 21-cm hyperfine line in atomic hydrogen. Before there were electronic computers, people had quite an accurate theoretical understanding of the energy levels in helium and more complicated systems.
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This chapter examines applications drawn from perturbation theory. The main topic in perturbation theory is the energy and spontaneous decay rate of the 21-cm hyperfine line in atomic hydrogen. Before there were electronic computers, people had quite an accurate theoretical understanding of the energy levels in helium and more complicated systems.
openaire +2 more sources