- PublicationIron aluminides – A step towards sustainable high-temperature wear resistant materials(2023)
;Rojacz, Harald ;Varga, Markus 2Scopus© Citations 1
- PublicationMonitoring data from an office room in a real operating building, suitable for state-space energy modellingThe dataset provides all necessary variables for data-driven energy modelling of an office room. The measurement data have been obtained from an office building operating as living lab in a temperate climate of Central Europe. The temperatures and the ventilation air flowrate are raw measurements, while the heat flows are calculated from measurements. The incoming solar irradiance is calculated with two façade models –simple and enhanced–, using measurements (solar irradiance, movable shading settings) and building characteristics (geometry, glazing and shading properties). One year and four months of data is provided with a fine one-minute time step and a coarser fifteen-minute time step. The dataset can be used to test and validate data-driven models, for example for predictive control applications.
- PublicationGrammatical mapping in L3 acquisition(2023)
;Flynn, SuzanneIn this chapter, we focus on the question of how development may take place in multilingual and the role of prior knowledge in this process. The theoretical called (GM) (Lust, 2012 for L1 acquisition) supposes an active, albeit unconscious, creative involvement of the learner in the construction of the constrained and guided by (UG). We propose that the GM paradigm provides a valid and principled account of the process of multilingual acquisition as well. By means of presenting concrete examples from our previous experimental research, we will illustrate how the three essential predictions deriving from this paradigm also bear out in the multilingual scenario. Similar to L1 acquisition, UG’s and invariant principle(s) are shown to be at work in . Moreover, based on of multilingual learners’ in elicited productions, we present tangible indications that multilingual learners draw upon previously known language grammars while engaged in linguistic computation – analysis, dissociation and integration – of target language-specific components. Our contribution to the is the specification of the manner in which multilingual learners draw upon previous knowledge in the construction of new target grammar, thus extricating explicit from implicit linguistic knowledge. We expect that the application of this paradigm onto multilingual experimental data may shed light on the degree to which domain-specific innate principles guide and constrain language acquisition in general. 5Scopus© Citations 4
- PublicationBond Wire Fatigue of Au, Cu, and PCC in Power LED PackagesBond wire failure, primarily wire neck breakage, in power LED devices due to thermomechanical fatigue is one of the main reliability issues in power LED devices. Currently, the standard testing methods to evaluate the device’s lifetime involve time-consuming thermal cycling or thermal shock tests. While numerical or simulation methods are used as convenient and quick alternatives, obtaining data from material lifetime models with accurate reliability and without experimental fatigue has proven challenging. To address this issue, a mechanical fatigue testing system was developed with the purpose of inducing mechanical stresses in the critical region of the bond wire connection above the ball bond. The aim was to accelerate fatigue cracks at this bottleneck, inducing a similar failure mode as observed during thermal tests. Experimental investigations were conducted on Au, Cu, and Pd-coated Cu bonding wires, each with a diameter of 25 µm, using both low- and high-frequency excitation. The lifetime of the wire bond obtained from these tests ranged from 100 to 1,000,000 cycles. This proposed testing method offers material lifetime data in a significantly shorter timeframe and requires minimal sample preparation. Additionally, finite element simulations were performed to quantify the stresses at the wire neck, facilitating comparisons to conventional testing methods, fatigue test results under various operating conditions, material models, and design evaluations of the fine wire bond reliability in LED and microelectronic packages.