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Open Access Publikationsfond FH Burgenland
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Apr 25, 2024
Apr 25, 2024
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Now showing 1 - 3 of 3
- 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.
19 225 - PublicationSocial recognition beyond employment. refugees embedding deskilling and restructuring identityEmployment is considered the primary sphere of social recognition. However, for refugees this source is often unavailable due to phases of unemployment and deskilling. This article explores practices for sustaining a desirable status and recognition via alternative spheres by analysing Chechen refugees’ interpretations of their employment trajectories, taking into account their status in the region of origin, where many had to abandon employment and education. After this first biographic caesura, they perceive ‘enforced idleness’ during the asylum procedure as a second fracture. Accommodation centres in remote areas and exclusion from the labour market bring about homogeneity of their networks. Positioning themselves as a ‘refugee subject’ becomes central for the rebuilding of identity and for narrating the redirection of career paths. The results, based on interviews in combination with network drawings, reconstruct how refugees make use of their contacts for job-seeking and embedding disruptive life events.
214 2077Scopus© Citations 5 - PublicationReciprocal Empowerment Through Remote Service Learning: How to Create Learning Opportunities That Embrace Difference and Foster Social JusticeThis chapter presents a novel pedagogical approach of “remote service learning” (RSL), which was applied in an undergraduate health degree program at an Austrian university. Remote service learning is a form of active blended learning that combines academic learning with practical experience and social commitment, using a range of tools and methods from online didactics. Drawing on emancipatory pedagogies such as transformative learning, an RSL-focused course pursues the ambitious goal of promoting reciprocal empowerment, that is, the promotion of mutual educational processes. “Reciprocal” refers to all stakeholders involved in the course, directly or indirectly: university students, the local community, the Austrian NGO, and the educator. Survey and qualitative data results have shown that the fundamental triad of learning, acting, and reflecting in remote service learning not only leads to a deeper understanding of the course content and discipline but also increased self-awareness, empathy, and a heightened sense of the highly complex social realities in different parts of the world.
194 108Scopus© Citations 4