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The robust control design problem for the levitation control of a nonlinear uncertain maglev system is considered. The uncertainty is (possibly) fast time-varying. The system has magnitude limitation on the airgap between the suspended chassis and the guideway in order to prevent undesirable contact. Furthermore, the (global) matching condition is not satisfied. After a three-step state transformation, a robust control scheme for the maglev vehicle is proposed, which is able to guarantee the uniform boundedness and uniform ultimate boundedness of the system, regardless of the uncertainty. The magnitude limitation of the airgap is guaranteed, regardless of the uncertainty.
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http://dx.doi.org/10.1016/j.isatra.2015.10.004 | DOI Listing |
Proc Natl Acad Sci U S A
September 2025
Molecular Imaging Program at Stanford, Department of Radiology, School of Medicine, Stanford University, Palo Alto, CA 94304.
The biophysical properties of single cells are crucial for understanding cellular function and behavior in biology and medicine. However, precise manipulation of cells in 3-D microfluidic environments remains challenging, particularly for heterogeneous populations. Here, we present "Electro-LEV," a unique platform integrating electromagnetic and magnetic levitation principles for dynamic 3-D control of cell position during separation.
View Article and Find Full Text PDFBiomedicines
July 2025
Department of Thoracic and Cardiovascular Surgery, Tübingen University Hospital, 72076 Tübingen, Germany.
Background: In advanced heart failure patients implanted with a fully magnetically levitated HeartMate 3 (HM3) Abbott left ventricular assist device (LVAD), it is unknown how the role of the LVAD outpatient clinic may affect the long-term survival after hospital discharge. Our objective is to share our standardized protocol for outpatient care, to describe the role of the LVAD outpatient clinic in postoperative long-term care after LVAD implantation, and to report survival.
Methods: We retrospectively reviewed all patients implanted with HM3 LVAD in our institute between September 2015 and January 2025.
Rev Sci Instrum
August 2025
Wyant College of Optical Sciences, University of Arizona, Tucson, Arizona 85721, USA.
Quantum inertial sensors test general relativity, measure fundamental constants, and probe dark matter and dark energy in the laboratory with outstanding accuracy. Their precision relies heavily on carefully choreographed quantum control of the atomic states with a collection of lasers, microwaves, and electric and magnetic fields. Making this technology available outside of the laboratory would unlock many applications, such as geophysics, geodesy, and inertial navigation.
View Article and Find Full Text PDFNature
August 2025
Department of the Geophysical Sciences, The University of Chicago, Chicago, IL, USA.
Lightweight nanofabricated structures could photophoretically loft payloads in near-space. Proposed structures range from microscale engineered aerosols, to centimetre-scale thin disks with variations in surface accommodation coefficients, to sandwich structures with nanoscale thickness that might be extended to metre-scale width. Quantitative understanding of how structural and surface properties determine photophoretic lofting forces is necessary to develop a practical flying device.
View Article and Find Full Text PDFSci Rep
August 2025
Department of Power Plants and System, Vinnytsia National Technical University, Vinnytsia, 21000, Ukraine.
Magnetic levitation (maglev) systems are characterized by strong nonlinearities and inherent open-loop instability, making precise position regulation of levitating bodies exceptionally challenging. These systems are highly sensitive to model uncertainties, parameter variations, and external disturbances. This demands advanced control strategies beyond conventional PID techniques.
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