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   Articles with "time variable" as a keyword



Determination of the time-variable geopotential by means of orbiting clocks

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recommendations! Published in 2024 at "Journal of Geodesy"

DOI: 10.1007/s00190-024-01868-9

Abstract: Monitoring the time-variable geopotential identifies the mass redistribution across the Earth and reveals, e.g., climate change and availability of water resources. The features of interest are characterized by spatial and temporal scales accessible only through… read more here.

Keywords: variable geopotential; time; time variable; orbiting clocks ... See more keywords

Wavelength-Controlled Triple-Mode Photoconductance-Polarity-Switching Field Effect Transistor for Secure Time-Variable Encrypted Optical Communication.

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recommendations! Published in 2025 at "ACS nano"

DOI: 10.1021/acsnano.5c02801

Abstract: The controllable polarity switch between positive photoconductance (PPC) and negative photoconductance (NPC) in a photodetector is essential for the realization of versatile, innovative applications. Incorporating polarity-switching photoconductance with other response states, yet still posing challenges,… read more here.

Keywords: effect; time variable; photoconductance; polarity switching ... See more keywords
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Variations of the Argentine Gyre Observed in the GRACE Time‐Variable Gravity and Ocean Altimetry Measurements

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recommendations! Published in 2018 at "Journal of Geophysical Research"

DOI: 10.1029/2018jc014189

Abstract: This work is supported by Taiwan Ministry of Science and Technology grants 105-2811-M-001-031 and 106-2116-M-001-013 and by National Nature Science Foundation of China grants 41474019, 41504014, and 41704012. read more here.

Keywords: time variable; observed grace; grace time; gyre observed ... See more keywords

Design scheme of discrete time variable structure controllers applied to multi‐input‐multi‐output linear systems with chattering elimination

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recommendations! Published in 2020 at "Iet Control Theory and Applications"

DOI: 10.1049/iet-cta.2018.6160

Abstract: Designing discrete time variable structure control with sliding mode (SM) schemes implies finding an asymptotically stable sliding surface with a control policy which assures the existence of a SM. Based on a recently innovative approach,… read more here.

Keywords: time variable; methodology; multi; discrete time ... See more keywords

Flexible competency based medical education: More time efficient, higher costs

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recommendations! Published in 2018 at "Medical Teacher"

DOI: 10.1080/0142159x.2017.1395404

Abstract: Abstract The financing of postgraduate medical education (PGME) becomes an important topic. PGME is costly, and in most western countries is partly paid by public funding. One of the models that can help to reduce… read more here.

Keywords: time variable; medical education; higher costs; time ... See more keywords
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Dynamics and control of entangled electron-photon states in nanophotonic systems with time-variable parameters

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recommendations! Published in 2021 at "Physical Review A"

DOI: 10.1103/physreva.103.013708

Abstract: We study the dynamics of strongly coupled nanophotonic systems with time-variable parameters. The approximate analytic solutions are obtained for a broad class of open quantum systems including a two-level fermion emitter strongly coupled to a… read more here.

Keywords: time variable; time; systems time; modulation ... See more keywords

Fixed-Time Variable Gain Trajectory Tracking Control for 6-DOF Manipulators With Unknown Disturbances

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recommendations! Published in 2025 at "IEEE Robotics and Automation Letters"

DOI: 10.1109/lra.2025.3625496

Abstract: In this letter, fixed-time variable gain trajectory tracking control is designed for solving nonlinear unknown disturbance problems of 6-DOF manipulators. The designed control method comprises a fixed-time variable gain disturbance observer (FTVGDOB) and a fixed-time… read more here.

Keywords: time; dof manipulators; time variable; fixed time ... See more keywords

Generalized Discrete-Time Variable Gain ADRC for Nonlinear Systems and Its Application to Parallel Teleoperated Manipulators

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recommendations! Published in 2025 at "IEEE Transactions on Circuits and Systems I: Regular Papers"

DOI: 10.1109/tcsi.2025.3555204

Abstract: In this paper, we propose a novel generalized discrete-time variable gain active disturbance rejection control (DTVGADRC) method for the n-th order discrete-time nonlinear systems. The error-driven generalized DTVGADRC can dynamically improve the control performances, including… read more here.

Keywords: variable gain; discrete time; generalized discrete; time variable ... See more keywords
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Striking While the Iron Is Hot: Using the Updated PHM Competencies in Time-Variable Training.

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recommendations! Published in 2021 at "Journal of hospital medicine"

DOI: 10.12788/jhm.3611

Abstract: In July 2020, the revision of The Pediatric Hospital Medicine Core Competencies was published, bringing to fruition three years of meticulous work.1 The working group produced 66 chapters outlining the knowledge, skills, and attitudes needed… read more here.

Keywords: medicine; time variable; variable training; time ... See more keywords

Homogeneous two-point problem for PDE of the second order in time variable and infinite order in spatial variables

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recommendations! Published in 2017 at "Open Mathematics"

DOI: 10.1515/math-2017-0009

Abstract: Abstract We prove that homogeneous problem for PDE of second order in time variable, and generally infinite order in spatial variables with local two-point conditions with respect to time variable, has only trivial solution in… read more here.

Keywords: time variable; order; pde second; problem pde ... See more keywords

Field determination of the specific input characteristics to calculate the value of C factor of time-variable crops for the revised universal soil loss equation (RUSLE).

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recommendations! Published in 2018 at "Soil and Water Research"

DOI: 10.17221/6500-swr

Abstract: To determine specific characteristics necessary for the computation of the C factor in RUSL e for time- variable crops, measurements were carried out in fields with selected agricultural crops grown by conventional practices. Sloping plots… read more here.

Keywords: time variable; soil; variable crops; factor ... See more keywords