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Nonlinear observer design for GNSS-aided inertial navigation systems with time-delayed GNSS measurements
(Journal article; Peer reviewed, 2017)Global navigation satellite system (GNSS) receivers suffer from an internal time-delay of up to several hundred milliseconds leading to a degeneration of position accuracy in high-dynamic systems. With the increasing ... -
Nonlinear Observer for Tightly Coupled Integrated Inertial Navigation Aided by RTK-GNSS Measurements
(Journal article; Peer reviewed, 2018)A modular nonlinear observer is considered for tightly coupled integration of inertial measurements with global satellite measurements. A real-time-kinematic (RTK) approach is utilized where the rover and base station ... -
Nonlinear Observer for Tightly Integrated Inertial Navigation Aided by Pseudo-Range Measurements
(Journal article; Peer reviewed, 2017)A modular nonlinear observer for inertial navigation aided by pseudo-range measurements is designed and analyzed. The attitude observer is based on a recent nonlinear complementary filter that uses magnetometer and ... -
Nonlinear Observer with Time-Varying Gains for Inertial Navigation Aided by Satellite Reference Systems in Dynamic Positioning
(Journal article, 2014)The measurement quality of Global Navigation Satellites Systems (GNSS) during marine operations will vary over time. Inherently, GNSS quality changes should be handled when GNSS is utilized as aid in inertial navigation ... -
Nonlinear Observers for Integrated INS/GNSS Navigation – Implementation Aspects
(Journal article, 2017)Navigation is a term with broad usage in everyday life and can mean the act of moving, moving through an unknown environment, ascertaining a craft's position, or even browsing on the Internet. Originally, the term meant ... -
Nonlinear optical microscopy of early stage (ICRS Grade-I) osteoarthritic human cartilage
(Journal article; Peer reviewed, 2015) -
Nonlinear optical properties of polycrystalline silicon core fibers from telecom wavelengths into the mid-infrared spectral region
(Journal article; Peer reviewed, 2019)Polycrystalline silicon core fibers (SCFs) fabricated via the molten core drawing (MCD) method are emerging as a flexible optoelectronic platform. Here, the optical transmission properties of MCD SCFs that have been tapered ... -
Nonlinear optical response and structural properties of MBE-grown Fe:ZnS films
(Journal article; Peer reviewed, 2018)Fe-doped ZnS films of high optical quality were fabricated using vacuum vapor deposition. Preferential crystalline orientation and phase purity of the host ZnS films were increased by the addition of small amounts of Fe, ... -
Nonlinear Preisach maps: Detecting and characterizing separate remanent magnetic fractions in complex natural samples
(Peer reviewed; Journal article, 2016)Natural remanent magnetization carriers in rocks can contain mixtures of magnetic minerals that interact in complex ways and are challenging to characterize by current measurement techniques. Here a nonlinear mapping scheme ... -
Nonlinear Propagation of mid-IR Femtosecond Pulses in ZBLAN Fiber
(Chapter, 2012)We demonstrate environmentally protected delivery of high-power femtosecond mid-IR pulses in a single-mode ZBLAN fiber by soliton formation. A 70-fs Cr:ZnS laser at 2.4 µm reaches this regime already at ~1.5 nJ launched ... -
Nonlinear proper orthogonal decomposition for convection-dominated flows
(Peer reviewed; Journal article, 2021)Autoencoder techniques find increasingly common use in reduced order modeling as a means to create a latent space. This reduced order representation offers a modular data-driven modeling approach for nonlinear dynamical ... -
Nonlinear soil-pile interaction for offshore wind turbines
(Journal article; Peer reviewed, 2018)The current work presents a parametric study, which involves different generalized nonlinear mechanical formulations with different damping characteristics to account for the interaction between a monopile‐supported offshore ... -
Nonlinear state and parameter estimation of a gas-liquid cylindrical cyclone
(Chapter, 2018)— New offshore oil and gas discoveries are located at deep waters with long tie-back distances. Development of such fields require compact gas-liquid separation technologies. Efficient operation of such separators require ... -
Nonlinear State and Parameter Estimation using Discrete-Time Double Kalman Filter
(Journal article; Peer reviewed, 2017)Dealing with nonlinear dynamics in conventional estimation methods like the extended Kalman filter (EKF) is challenging, since they are not guaranteed to have global convergence, and their instability can arise by selecting ... -
A Nonlinear State Observer for the Bi-Hormonal Intraperitoneal Artificial Pancreas
(Chapter, 2022)Currently, continuous glucose monitoring sensors are used in the artificial pancreas to monitor blood glucose levels. However, insulin and glucagon concentrations in different parts of the body cannot be measured in ... -
The Nonlinear Thermoacoustic Eigenvalue Problem and Its Rational Approximations: Assessment of Solution Strategies
(Peer reviewed; Journal article, 2022)Nonlinear eigenvalue problems (NLEVPs) arise in thermoacoustics by considering the temporal evolution of small perturbations in the relevant governing equations. In this work, two solution strategies are compared: (i) a ... -
Nonlinear vertical accelerations of a floating torus in regular waves
(Journal article; Peer reviewed, 2016)The longitudinal motions and vertical accelerations of a floating torus as well as wave motion inside the torus are studied by model tests in regular deep-water waves. Comparisons are made with linear and partly with ... -
Nonlocal Coupling between Antiferromagnets and Ferromagnets in Cavities
(Journal article; Peer reviewed, 2018)Microwaves couple to magnetic moments in both ferromagnets and antiferromagnets. Although the magnons in ferromagnets and antiferromagnets radically differ, they can become entangled via strong coupling to the same microwave ... -
Nonlocal nonlinear diffusion equations. Smoothing effects, Green functions, and functional inequalities
(Peer reviewed; Journal article, 2023)We establish boundedness estimates for solutions of generalized porous medium equations of the form where and is a linear, symmetric, and nonnegative operator. The wide class of operators we consider includes, but is not ... -
Nonlocal Temporal Interferometry for Highly Resilient Free-Space Quantum Communication
(Peer reviewed; Journal article, 2023)Entanglement distribution via photons over long distances enables many applications, including quantum key distribution, which provides unprecedented privacy. The inevitable degradation of entanglement through noise ...