Articles with "space time" as a keyword



Anthropogenic and climatic drivers of population densities in an African savanna ungulate community

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Published in 2024 at "Population Ecology"

DOI: 10.1002/1438-390x.12182

Abstract: Many ungulate species in Africa range in habitats that vary in type and quality over space and time, but ongoing environmental change is substantially altering their habitats. Identifying key environmental variables that regulate ungulate population… read more here.

Keywords: among species; population; space time; community ... See more keywords

Co‐Prime Modulation for Space‐Time‐Coding Digital Metasurfaces with Ultralow‐Scattering Characteristics

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Published in 2024 at "Advanced Functional Materials"

DOI: 10.1002/adfm.202314110

Abstract: Multi‐dimensional modulation of electromagnetic (EM) waves is critical in various fields such as electronic and photonic systems. Space‐time‐coding (STC) digital metasurfaces, an innovative platform for programmable metasurfaces, offer a straightforward and robust solution for spatio‐temporal… read more here.

Keywords: prime modulation; time coding; space; digital metasurfaces ... See more keywords

Mass Transfer Modulation by Hollow Multi‐Shelled Structures for High Space‐Time Yield Synthesis of Light Olefins from Syngas

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Published in 2024 at "Advanced Functional Materials"

DOI: 10.1002/adfm.202316547

Abstract: The separation of CO activation and C─C coupling enables oxide–zeolite catalyzed tandem reaction toward direct conversion of syngas into light olefins to be a promising alternative for the traditional Fischer–Tropsch process with elevated selectivity. Utilizing… read more here.

Keywords: light olefins; time yield; mass transfer; space time ... See more keywords

Machine‐Learning‐Enabled Multi‐Frequency Synthesis of Space‐Time‐Coding Digital Metasurfaces

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Published in 2024 at "Advanced Functional Materials"

DOI: 10.1002/adfm.202403577

Abstract: Digital metasurfaces based on space‐time coding have established themselves as a powerful and versatile platform for joint spatial/spectral control of electromagnetic waves. However, their advanced design remains a largely open problem with significant computational challenges.… read more here.

Keywords: digital metasurfaces; multi frequency; time coding; space time ... See more keywords

Joint Control of Radiated and Surface Waves via Space‐Time Coding Metasurfaces

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Published in 2025 at "Advanced Functional Materials"

DOI: 10.1002/adfm.202519200

Abstract: Digitally programmable metasurfaces, also known as reconfigurable intelligent surfaces (RISs), are emerging as key enablers of smart radio environments by offering dynamic control over electromagnetic wave propagation. Space‐time coding metasurfaces, in particular, allow simultaneous manipulation… read more here.

Keywords: time coding; space; control; surface ... See more keywords

Topological Space‐Time Photonic Transitions in Angular‐Momentum‐Biased Metasurfaces

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Published in 2020 at "Advanced Optical Materials"

DOI: 10.1002/adom.202000075

Abstract: In this paper, topological space‐time photonic transition of light in angular‐momentum‐biased metasurfaces is established, which yields a superposition of orbital‐angular‐momentum (OAM)‐carrying beams at distinct frequency harmonics upon scattering whose topological charges and frequency shifts are… read more here.

Keywords: angular momentum; space time; topological space; time photonic ... See more keywords

Amplification and Manipulation of Nonlinear Electromagnetic Waves and Enhanced Nonreciprocity using Transmissive Space‐Time‐Coding Metasurface

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Published in 2022 at "Advanced Science"

DOI: 10.1002/advs.202105960

Abstract: A novel amplifier‐based transmissive space‐time‐coding metasurface is presented to realize strongly nonlinear controls of electromagnetic (EM) waves in both space and frequency domains, which can manipulate the propagation directions and adjust enhancements of nonlinear harmonic… read more here.

Keywords: space; power; time coding; space time ... See more keywords

Antimatter Gravity and the Results of the ALPHA‐g Experiment

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Published in 2024 at "Annalen der Physik"

DOI: 10.1002/andp.202300519

Abstract: By combining general relativity and CPT symmetry, the theory of CPT gravity predicts gravitational repulsion between matter and CPT‐transformed matter, i.e., antimatter inhabiting an inverted space‐time. Such repulsive gravity turned out to be an excellent… read more here.

Keywords: results alpha; gravity; repulsive gravity; antimatter ... See more keywords

Performance evaluation of GPU parallelization, space-time adaptive algorithms, and their combination for simulating cardiac electrophysiology.

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Published in 2018 at "International journal for numerical methods in biomedical engineering"

DOI: 10.1002/cnm.2913

Abstract: The use of computer models as a tool for the study and understanding of the complex phenomena of cardiac electrophysiology has attained increased importance nowadays. At the same time, the increased complexity of the biophysical… read more here.

Keywords: cardiac electrophysiology; space time; time; geometry ... See more keywords

A PDE‐regularized smoothing method for space–time data over manifolds with application to medical data

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Published in 2022 at "International Journal for Numerical Methods in Biomedical Engineering"

DOI: 10.1002/cnm.3650

Abstract: We propose an innovative statistical‐numerical method to model spatio‐temporal data, observed over a generic two‐dimensional Riemanian manifold. The proposed approach consists of a regression model completed with a regularizing term based on the heat equation.… read more here.

Keywords: smoothing method; pde regularized; method; space time ... See more keywords

Hierarchy in Structuring of Resource Selection: Understanding Elk Selection Across Space, Time, and Movement Strategies

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Published in 2025 at "Ecology and Evolution"

DOI: 10.1002/ece3.71097

Abstract: ABSTRACT Movement is a fundamental aspect of animal ecology that varies across space, time, and among individuals or groups within a population. Broad‐scale patterns of animal movement are often classified into different movement strategies, such… read more here.

Keywords: resource selection; movement; space time; selection ... See more keywords