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Dependence of Crater Formation in Dry EDM on Electrical Breakdown Mechanism
(2016)Procedia CIRP ~ 18th CIRP Conference on Electro Physical and Chemical Machining (ISEM XVIII)The research effort in dry electrical discharge machining (DEDM) has increased during the last years. The process has advantages in comparison with EDM in oil-based dielectric media, such as low tool electrode wear, thin recast layers on the work piece surface and much more environmentally friendly conditions. However, the plasma-material surface interactions involved in dry EDM are not properly explained yet. Therefore, a characterization ...Conference Paper -
A Teaching System for Hands-on Quadcopter Control
(2019)IFAC-PapersOnLine ~ 12th IFAC Symposium on Advances in Control Education, ACE 2019. ProceedingsQuadcopters, popular in consumer and commercial applications, are a perfect testing ground for both basic and advanced control techniques. This makes them an ideal platform for offering experiment-based control courses. We present the software system developed to teach hands-on quadcopter control, that we have used to offer a short course to groups of 32 undergraduate electrical engineering students. Our system allows students to work ...Conference Paper -
Experiment design for impulse response identification with signal matrix models
(2021)IFAC-PapersOnLine ~ 19th IFAC Symposium on System Identification, SYSID 2021This paper formulates an input design approach for truncated infinite impulse response identification in the context of implicit model representations recently used as basis for data-driven simulation and control approaches. Precisely, the considered model consists of a linear combination of the columns of a data (or signal) matrix. An optimal combination for the case of noisy data was recently proposed using a maximum likelihood approach, ...Conference Paper -
DIS coefficient functions at four loops in QCD and beyond
(2022)PoS: Proceedings of ScienceWe report results for the lowest even-N moments of the flavor-nonsinglet structure functions F2 and FL in QCD at the fourth order in the perturbative expansion in the strong coupling constant αs. Our results are presented in numerical form and we compare them with the leading and subleading terms of the threshold expansion for large values of N, which corresponds to the limit x → 1.Conference Paper -
Structural Balance and Interpersonal Appraisals Dynamics: Beyond All-to-All and Two-Faction Networks
(2020)IFAC-PapersOnLine ~ 3rd IFAC Workshop on Cyber-Physical & Human Systems, CPHS 2020. ProceedingsStructural balance theory describes stable configurations of topologies of signed interpersonal appraisal networks. Various mathematical models have been proposed to explain how initially unbalanced appraisal networks evolve to structural balance. However, the existing models either diverge in finite time, or could get stuck in jammed states, or converge to only non-all-to-all graphs starting from certain sets of initial conditions. It ...Conference Paper -
Data-driven safety verification of stochastic systems via barrier certificates
(2021)IFAC-PapersOnLine ~ 7th IFAC Conference on Analysis and Design of Hybrid Systems (ADHS 2021)In this paper, we propose a data-driven approach to formally verify the safety of (potentially) unknown discrete-time continuous-space stochastic systems. The proposed framework is based on a notion of barrier certificates together with data collected from trajectories of unknown systems. We first reformulate the barrier-based safety verification as a robust convex problem (RCP). Solving the acquired RCP is hard in general because not ...Conference Paper -
Data-driven estimation of infinitesimal generators of stochastic systems
(2021)IFAC-PapersOnLine ~ 7th IFAC Conference on Analysis and Design of Hybrid Systems (ADHS 2021)This paper is concerned with a data-driven approach for the estimation of infinitesimal generators of continuous-time stochastic systems with unknown dynamics. We first approximate the infinitesimal generator of the solution process via a set of data collected from trajectories of the unknown system. The approximation utilizes both time discretization and sampling from the solution process. Assuming proper continuity assumptions on dynamics ...Conference Paper -
Digital Master Builders: Disruptive construction technologies
(2021)Proceedings of the International Conference on the 4th Game Set and Match (GSM4Q-2019)Conference Paper -
Late 18th-century innovation: The first Mediterranean purlin roof truss in German-speaking Switzerland at Embrach ZH
(2021)History of Construction CulturesSwiss architect David Vogel (1744–1808) enjoyed a thorough theoretical training compared to his compatriots. His most important commission after his education was the transversely oriented “oval” reformed church at Embrach ZH (1779–80). Vogel’s designs show distinct Italian influences from three years of studies with Winckelmann in Rome in the 1760s. He integrated these ideas into the designs for the church at Embrach, where both the ...Conference Paper -
Vaults, centring, and formwork of the Late Gothic period in Southern Germany
(2021)History of Construction CulturesThe construction of Gothic rib vaults not only required centring for the ribs, but usually also substantial formwork for the masonry of the vault compartments. In the late Gothic architecture of southern Germany, characterised by vaults with elaborate networks of ribs and an advanced building technology, formwork could be largely reduced. At the same time, the centring for the ribs became more complex. This article presents evidence of ...Conference Paper