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Thin film drainage dynamics of wheat and rye dough liquors and oat batter liquor
(2021)Food HydrocolloidsTo obtain bread with a high loaf volume and homogeneous crumb, gas cells require sufficient stability until the discontinuous gas structure of dough is transformed into the continuous structure of bread. At the end of fermentation, dough gas cells are supposedly regionally separated by two air-water (A-W) interfaces and a liquid film. ‘Dough liquor’ (DL) or ‘batter liquor’ (BL), i.e. the supernatant after ultracentrifugation of dough and ...Journal Article -
Convex Nonparametric Formulation for Identification of Gradient Flows
(2021)IEEE Control Systems LettersWe develop a nonparametric identification method for nonlinear gradient-flow dynamics. In these systems, the vector field is the gradient field of a potential energy function. This fundamental fact about the dynamics is a structural prior knowledge and a constraint in the proposed identification method. While the nature of the identification problem is an estimation in the space of functions, we derive an equivalent finite dimensional ...Journal Article -
Median, Mean, and Variance Stability of a Process under Temporally Correlated Stochastic Feedback
(2021)IEEE Control Systems LettersStochasticity in feedback gains leads to heavy-tailed state distributions in which the median, mean, and variance have different stability properties. These properties are characterised for a scalar system with temporally correlated stochastic feedback. Necessary and sufficient conditions are obtained for the generic case of log-normal feedback gain distributions. Temporal correlation is modeled by a multivariable Gaussian distribution ...Journal Article -
Nonlinear System Identification With Prior Knowledge on the Region of Attraction
(2021)IEEE Control Systems LettersWe consider the problem of nonlinear system identification when prior knowledge is available on the region of attraction (ROA) of an equilibrium point. We propose an identification method in the form of an optimization problem, minimizing the fitting error and guaranteeing the desired stability property. The problem is approached by joint identification of the dynamics and a Lyapunov function verifying the stability property. In this ...Journal Article -
A multi-national comparison of meat eaters' attitudes and expectations for burgers containing beef, pea or algae protein
(2021)Food quality and preferenceJournal Article -
Self-piercing riveting process: Prediction of joint characteristics through finite element and neural network modeling
(2021)Journal of Advanced Joining ProcessesDeveloping robust numerical simulation tools to investigate the self-piercing riveting process is critical, since the feasibility, quality and strength of riveted connections relies on the successful formation of mechanical interlocks between the rivet and sheet materials. In the present study, we investigate the riveting of aluminum alloy and dual-phase steel sheets (AA7075-F/DP600 and AA6016-T4/DP600) over a wide range of sheet thicknesses, ...Journal Article -
Forecasting Swiss exports using Bayesian forecast reconciliation
(2021)European Journal of Operational ResearchThis paper proposes a novel forecast reconciliation framework using Bayesian state-space methods. It allows for the joint reconciliation at all forecast horizons and uses predictive distributions rather than past variation of forecast errors. Informative priors are used to assign weights to specific predictions, which makes it possible to reconcile forecasts such that they accommodate specific judgmental predictions or managerial decisions. ...Journal Article -
Zero-Voltage-Switching Auxiliary Circuit for Minimized Inductance Requirement in Series-Resonant DC/DC Converter Systems
(2021)IEEE Transactions on Power ElectronicsFor power electronic converter systems, the cost and the size of the magnetic components are typically limiting factors when it comes to overall production costs and power density. This especially holds for soft-switching high-frequency applications, where a resonant discharge of the output capacitances of the semiconductors relies on sufficient amount of energy stored in the main magnetic components, i.e., inductors or transformers, ...Journal Article -
False-twin-free graphs with a fixed number of negative eigenvalues
(2021)Linear Algebra and its ApplicationsWe prove a quantitative version of a result of Torgašev concerning graphs with a fixed number of negative eigenvalues. We also establish a structural result stating that if for a hereditary family of graphs every graph of order N + 1 and N + 2 has false twins, then every graph from this family of order greater than N has false twins.Journal Article -
Virtual fatigue diagnostics of wake-affected wind turbine via Gaussian Process Regression
(2021)Renewable EnergyWe propose a data-driven model to predict the short-term fatigue Damage Equivalent Loads (DEL) on a wake-affected wind turbine based on wind field inflow sensors and/or loads sensors deployed on an adjacent up-wind wind turbine. Gaussian Process Regression (GPR) with Bayesian hyperparameters calibration is proposed to obtain a surrogate from input random variables to output DELs in the blades and towers of the up-wind and wake-affected ...Journal Article