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Passivity and Decentralized Stability Conditions for Grid-Forming Converters
(2024)IEEE Transactions on Power SystemsWe prove that the popular grid-forming control, i.e., dispatchable virtual oscillator control (dVOC), also termed complex droop control, exhibits output-feedback passivity in its large-signal model, featuring an explicit and physically meaningful passivity index. Using this passivity property, we derive decentralized stability conditions for the transient stability of dVOC in multi-converter grid-connected systems, beyond prior small-signal ...Journal Article -
Stimulus-responsive assembly of nonviral nucleocapsids
(2024)Nature CommunicationsControlled assembly of a protein shell around a viral genome is a key step in the life cycle of many viruses. Here we report a strategy for regulating the co-assembly of nonviral proteins and nucleic acids into highly ordered nucleocapsids in vitro. By fusing maltose binding protein to the subunits of NC-4, an engineered protein cage that encapsulates its own encoding mRNA, we successfully blocked spontaneous capsid assembly, allowing ...Journal Article -
Quantum-inspired framework for computational fluid dynamics
(2024)Communications PhysicsComputational fluid dynamics is both a thriving research field and a key tool for advanced industry applications. However, the simulation of turbulent flows in complex geometries is a compute-power intensive task due to the vast vector dimensions required by discretized meshes. We present a complete and self-consistent full-stack method to solve incompressible fluids with memory and run time scaling logarithmically in the mesh size. Our ...Journal Article -
DenRAM: neuromorphic dendritic architecture with RRAM for efficient temporal processing with delays
(2024)Nature CommunicationsAn increasing number of studies are highlighting the importance of spatial dendritic branching in pyramidal neurons in the neocortex for supporting non-linear computation through localized synaptic integration. In particular, dendritic branches play a key role in temporal signal processing and feature detection. This is accomplished thanks to coincidence detection (CD) mechanisms enabled by the presence of synaptic delays that align ...Journal Article -
Mechanism of DNA unwinding by MCM8-9 in complex with HROB
(2024)Nature CommunicationsHROB promotes the MCM8-9 helicase in DNA damage response. To understand how HROB activates MCM8-9, we defined their interaction interface. We showed that HROB makes important yet transient contacts with both MCM8 and MCM9, and binds the MCM8-9 heterodimer with the highest affinity. MCM8-9-HROB prefer branched DNA structures, and display low DNA unwinding processivity. MCM8-9 unwinds DNA as a hexamer that assembles from dimers on DNA in ...Journal Article -
Machine learning algorithms for the prediction of drought conditions in the Wami River sub-catchment, Tanzania
(2024)Journal of Hydrology: Regional StudiesStudy region: This study refers to the Wami river sub-catchments in Eastern Tanzania. Study Focus: The five-machine learning (ML) algorithms, including long short-term memory (LSTM), multivariate adaptive regression spline (MARS), support vector machine (SVM), extreme learning machine (ELM), and M5 Tree, were used to predict the most widely used drought index, the standard precipitation index (SPI), at six and nine months. Algorithms were ...Journal Article -
Terahertz chiral subwavelength cavities breaking time-reversal symmetry via ultrastrong light-matter interaction
(2024)Physical Review BWe demonstrate terahertz chiral subwavelength cavities that break time-reversal symmetry by coupling the degenerate linearly polarized modes of two orthogonal sets of nanoantenna arrays using the inter-Landau-level transition of a two-dimensional (2D) electron gas in a perpendicular magnetic field, realizing normalized light-matter coupling rates up to ωR/ωcav=0.78 with a dispersion that is modified by the parasitic capacitive coupling ...Journal Article -
Learning robust autonomous navigation and locomotion for wheeled-legged robots
(2024)Science RoboticsAutonomous wheeled-legged robots have the potential to transform logistics systems, improving operational efficiency and adaptability in urban environments. Navigating urban environments, however, poses unique challenges for robots, necessitating innovative solutions for locomotion and navigation. These challenges include the need for adaptive locomotion across varied terrains and the ability to navigate efficiently around complex dynamic ...Journal Article -
Leptomeningeal collaterals regulate reperfusion in ischemic stroke and rescue the brain from futile recanalization
(2024)NeuronRecanalization is the mainstay of ischemic stroke treatment. However, even with timely clot removal, many stroke patients recover poorly. Leptomeningeal collaterals (LMCs) are pial anastomotic vessels with yet-unknown functions. We applied laser speckle imaging, ultrafast ultrasound, and two-photon microscopy in a thrombin-based mouse model of stroke and fibrinolytic treatment to show that LMCs maintain cerebral autoregulation and allow ...Journal Article -
Radiation-Induced Effects in SiC Vertical Power MOSFETs Irradiated at Ultrahigh Doses
(2024)IEEE Transactions on Nuclear ScienceTotal-ionizing dose (TID) and displacement damage (DD) are investigated in SiC power MOSFETs at ultrahigh doses with 10-keV X-ray and 3-MeV protons. Significant parametric shifts in the electrical responses of the devices are observed depending on the bias condition and on the fabrication technology. Worst TID degradation is measured when positive gate bias is applied during the irradiation, due to positive charge trapping in the gate ...Journal Article