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62 results found.

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Improved Round Robin CPU Scheduling Algorithm with Different Arrival Times Based on Dynamic Quantum
Article
Article
ِAbdulnasir Ahmad · University of Mosul, College of Education for Pure Science · 2022 · ISSN 1812-125X
Modern operating systems are based on the principle of time-sharing in executing simultaneous operations. Determining the length of the time slice, and the times when processes arrive at the ready queue are problems that...
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Open Access
An Attempt to Set Standards for Studying and Comparing the Efficiency of Round Robin Algorithms
Article
Article
Abdulnasir Y. Ahmad · University of Mosul, College of Education for Pure Science · 2023 · ISSN 1812-125X
With the advent of the need for interactive systems, the urgent need for time-sharing systems has emerged. Round-robin algorithms have emerged to achieve time-sharing. The degree of performance of time-sharing systems de...
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Time-varying optical vortices enabled by time-modulated metasurfaces
Article
Article
Barati Sedeh Hooman et al · Wiley · 2020 · ISSN 2192-8606
In this paper, generation of optical vortices with time-varying orbital angular momentum (OAM) and topological charge is theoretically demonstrated based on time-modulated metasurfaces with a linearly azimuthal frequency...
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Quantum Calabi-Yau black holes and non-perturbative D0-brane effects
Article
Article
Alberto Castellano, Dieter Lüst, Carmine Montella, Matteo Zatti · SciPost · 2026 · ISSN 2542-4653
We compute the supersymmetric entropy of the most general BPS black hole in 4d $\mathcal{N}=2$ supergravity coupled to $n_V$ vector multiplets, obtained from Type IIA string theory compactified on a Calabi--Yau threefold...
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Spacetime quantum actions
Article
Article
Diaz, Nahuel Luciano et al · American Physical Society · 2021 · ISSN 2470-0010
We propose a formulation of quantum mechanics in an extended Fock space in which a tensor product structure is applied to time. Subspaces of histories consistent with the dynamics of a particular theory are defined by a ...
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Superclassical non-Markovian open quantum dynamics
Article
Article
Budini, Adrian Adolfo · American Physical Society · 2025 · ISSN 2469-9926
We characterize a class of superclassical non-Markovian open quantum system dynamics that are defined by their lack of measurement invasiveness when the corresponding observable commutates with the pre-measurement state....
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Generalized dynamic inequalities similar to Hardy’s inequality involving a convex function on time scales
Article
Article
Ahmed I. Saied et al · Vilnius Gediminas Technical University · 2026 · ISSN 1392-6292
In this paper, we establish some new generalizations of dynamic inequalities similar to Hardy's inequality on a time scale $\mathbb{T}$, by applying Jensen's inequality, integration by parts and chain rule on time scales...
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Verifying quantum memory in the dynamics of spin-boson models
Article
Article
Charlotte Bäcker et al · American Physical Society · 2026 · ISSN 2643-1564
We investigate the nature of memory effects in the non-Markovian dynamics of spin-boson models. Local quantum memory criteria can be used to indicate that the reduced dynamics of an open system necessarily requires a qua...
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Driven Liouville–von Neumann Equation for Quantum Transport and Multiple-Probe Green’s Functions
Article
Article
Ramírez, Francisco Fernando et al · American Chemical Society · 2019 · ISSN 1932-7447
The so-called driven Liouville–von Neumann equation is a dynamical formulation to simulate a voltage bias across a molecular system and to model a time-dependent current in a grand-canonical framework. This approach in...
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Efficient Quantum Information Transfer Through a Uniform Channel
Article
Article
Paola Verrucchi et al · SAGE Publishing · 2011 · ISSN 1847-9804
Effective quantum-state and entanglement transfer can be obtained by inducing a coherent dynamics in quantum wires with homogeneous intrawire interactions. This goal is accomplished by optimally tuning the coupling betwe...
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Full-polarization-locked vortex beam generator with time-varying characteristics
Article
Article
Jiang Lixin et al · Wiley · 2024 · ISSN 2192-8614
Vortex beams carrying orbital angular momentum (OAM) are considered to hold significant prospects in fields such as super-resolution imaging, high-capacity communications, and quantum optics. Therefore, the techniques of...
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Highly efficient upconversion photodynamic performance of rare-earth-coupled dual-photosensitizers: ultrafast experiments and excited-state calculations
Article
Article
Yang Yubiao et al · Wiley · 2024 · ISSN 2192-8614
Upconversion photodynamic therapy (UC-PDT), which integrates upconversion nanoparticles (UCNPs) with photosensitizers (PSs), presents a promising advancement in the field of phototherapy. However, despite the extensive s...
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Boron quantum dots all-optical modulator based on efficient photothermal effect
Article
Article
Cong Wang et al · Editorial Office of Opto-Electronic Journals Group, Institute of Optics and Electronics, CAS, China · 2021 · ISSN 2096-4579
All-optical devices without external electronic components have drawn extraordinary attentions in all-optical communication. In this work, boron quantum dots (BQDs) were synthesized by a facile liquid-phase exfoliation m...
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Closed-time-path approach to the Casimir energy in real media
Article
Article
Rubio Lopez, Adrian Ezequiel et al · American Physical Society · 2014 · ISSN 0556-2821
The closed-time-path (CTP) formalism is applied, in the framework of open quantum systems, to study the time evolution of the expectation value of the energy-momentum tensor of a scalar field in the presence of real mate...
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Deterministic time rewinding of waves in time-varying media
Article
Article
Kim Seulong et al · Wiley · 2025 · ISSN 2192-8614
Temporal modulation of material parameters offers unprecedented control over wave dynamics, enabling phenomena beyond the capabilities of static systems. Here we introduce and analyze a robust mechanism for time rewindin...
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Material complementario
Optical tuning and ultrafast dynamics of high-temperature superconducting terahertz metamaterials
Article
Article
Singh Ranjan et al · Wiley · 2012 · ISSN 2192-8606
Through the integration of semiconductors or complex oxides into metal resonators, tunable metamaterials have been achieved by a change of environment using an external stimulus. Metals provide high conductivity to reali...
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Quasi-equilibrium and quantum correlation in an open spin-pair system
Article
Article
Taboada, Juan Agustin et al · Springer · 2023 · ISSN 1573-1332
Quasi-equilibrium states that can be prepared in solids through Nuclear Magnetic Resonance (NMR) techniques are out-of-equilibrium states that slowly relax towards thermodynamic equilibrium with the lattice. In this work...
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Theoretical model of passive mode-locking in terahertz quantum cascade lasers with distributed saturable absorbers
Article
Article
Seitner Lukas et al · Wiley · 2024 · ISSN 2192-8614
In research and engineering, short laser pulses are fundamental for metrology and communication. The generation of pulses by passive mode-locking is especially desirable due to the compact setup dimensions, without the n...
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Material complementario
Topologically protected optical signal processing using parity–time-symmetric oscillation quenching
Article
Article
Yu Sunkyu et al · Wiley · 2021 · ISSN 2192-8614
The concept of topology is universally observed in various physical objects when the objects can be described by geometric structures. Although a representative example is the knotted geometry of wavefunctions in recipro...
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Ultrafast dynamics of photoexcited carriers in perovskite semiconductor nanocrystals
Article
Article
Yu Buyang et al · Wiley · 2021 · ISSN 2192-8614
Perovskite semiconductor nanocrystals have emerged as a promising family of materials for optoelectronic applications including light-emitting diodes, lasers, light-to-electricity convertors and quantum light emitters. T...
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Influence of nonmagnetic impurity scattering on spin dynamics in diluted magnetic semiconductors
Article
Article
Cygorek, M. et al · American Physical Society · 2017 · ISSN 1098-0121
The doping of semiconductors with magnetic impurities gives rise not only to a spin-spin interaction between quasifree carriers and magnetic impurities but also to a local spin-independent disorder potential for the carr...
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Optical control of the spin of a magnetic atom in a semiconductor quantum dot
Article
Article
Besombes L. et al · Wiley · 2015 · ISSN 2192-8606
The control of single spins in solids is a key but challenging step for any spin-based solid-state quantumcomputing device. Thanks to their expected long coherence time, localized spins on magnetic atoms in a s...
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Real-time scattering in ϕ^{4} theory using matrix product states
Article
Article
Bahaa Al Sayegh et al · American Physical Society · 2026 · ISSN 2643-1564
We investigate the critical behavior and real-time scattering dynamics of the interacting ϕ^{4} quantum field theory in (1+1) dimensions using uniform matrix product states (uMPS) and the time-dependent variational prin...
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Spatial and time-resolved properties of emission enhancement in polar/semi-polar InGaN/GaN by surface plasmon resonance
Article
Article
Ikeda Kento et al · Wiley · 2024 · ISSN 2192-8614
Light-emitting diodes (LEDs) are widely used as next-generation light sources because of their various advantages. However, their luminous efficiency is remarkably low at the green-emission wavelength. The luminous effic...
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Open Access
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