The Effect of Annotation Quality on Wear Semantic Segmentation by CNN.

In this work, we investigate the impact of annotation quality and domain expertise on the performance of Convolutional Neural Networks (CNNs) for semantic segmentation of wear on titanium nitride (TiN) and titanium carbonitride (TiCN) coated end mills. Using an innovative measurement system and customized CNN architecture, we found that domain expertise significantly affects model performance. Annotator 1 achieved maximum mIoU scores of 0.8153 for abnormal wear and 0.7120 for normal wear on TiN datasets, whereas Annotator 3 with the lowest expertise achieved significantly lower scores. Sensitivity to annotation inconsistencies and model hyperparameters were examined, revealing that models for TiCN datasets showed a higher coefficient of variation (CV) of 16.32% compared to 8.6% for TiN due to the subtle wear characteristics, highlighting the need for optimized annotation policies and high-quality images to improve wear segmentation.

[Students' perspective on generalized nursing education in Germany: Results of a nationwide online survey]. / Die generalistische Pflegeausbildung in Deutschland aus Sicht Auszubildender.

Students' perspective on generalized nursing education in Germany: Results of a nationwide online survey Abstract. Background: Generalized nursing education in Germany was introduced in 2020 as a reaction to changed care conditions. The reform's implementation is accompanied by a nationwide longitudinal survey with three surveys among students in generalized nursing education. Aims: We present results of the first survey round. The explorative approach provides data that allows insights into students' experiences and thus indicates adjustment opportunities. Method: The online survey used standardized questionnaires and was directed at students that had begun generalized nursing education in 2020. 1,267 students from 316 nursing schools in 15 German federal states participated in the first survey round. The survey recorded students' career choice motivations, learning experiences in nursing schools and practical placements, as well as contextual factors. Results: The students' career choice is mainly interest-driven (77.8%). The program is rated good to satisfactory (overall grade 2.45). Frequent and well-designed practical guidance and a transfer of information between nursing school and clinical placement appear important but insufficiently implemented. Data shows an increased need for support services. Conclusions: In addition to positive findings, the practical learning design and the dialogue between theory and practice appear challenging, while support services should be expanded.

[German nursing study programs from the students' perspective: First results of a nationwide longitudinal study]. / Primärqualifizierende Pflegestudiengänge aus Sicht Studierender.

German nursing study programs from the students' perspective: First results of a nationwide longitudinal study Abstract. Background: The Nursing Professions Act establishes a concrete framework for academic nursing education in Germany for the first time. The primary qualifying nursing courses started in 2020 and will be accompanied by a systematic reporting of students' experiences over a period of three years. Aims: The article presents the results of the initial survey period (2021) on the students' point of view. Challenges and the need for further regulation of the primary qualifying nursing studies are analyzed and approaches to solutions are developed. Methods: The online survey is designed as a longitudinal cohort study with three measurement periods (2021, 2022, 2023). A descriptive analysis considers data of N = 57 students in the initial survey period. Results: The primary qualifying nursing study program is rated good overall (overall grade 2.32). However, one third (35.85%) are more critical in their assessments. Every second student perceives a need for adjustment in the financing of students. Learning in clinical placement settings often does not meet students' expectations. 86% of respondents report that nursing practice sites are insufficiently informed about students' qualification. Conclusions: Students' financing, and in particular the payment of assignments in the nursing practice, represents a regulatory gap with need for short-term solutions. For learning in nursing practice, there is a need for an enhanced practical placement guidance that is better geared to academic nursing education. This is accompanied by the need for a more specific definition of later professional fields and job profiles.

Process regimes during welding of glass by femtosecond laser pulse bursts.

Various process regimes were observed during microwelding of glass with bursts of ultrashort laser pulses. Two major welding regimes and various subregimes were identified for two different materials. The radiation emitted by the laser-induced plasma was used to monitor different regimes that characterize glass microwelding. A comprehensive understanding of the various process regimes can be exploited to use the regimes according to their specific advantages, especially for industrial applications.

High-quality tailored-edge cleaving using aberration-corrected Bessel-like beams.

We report on the usage of ultrashort laser pulses in the form of aberration-corrected Bessel-like beams for laser cutting of glass with bevels. Our approach foresees inclining the material's entrance surface with respect to the processing optics. The detailed analysis of phase distortions caused by the beam transition through the tilted glass surface allows precompensating for occurring aberrations using digital holography. We verify theoretical considerations by means of pump-probe microscopy and present high-quality edges in nonstrengthened silicate glass.

Transverse pump-probe microscopy of moving breakdown, filamentation and self-organized absorption in alkali aluminosilicate glass using ultrashort pulse laser.

We present time and space resolved transverse pump-probe measurements of the free electron and defect generation induced by nonlinear absorption of ultra short pulsed laser radiation in unhardened Corning Gorilla glass. The applied setup exhibits a 100 fs probe pulse duration and an independent pump pulse duration up to 5 ps. Hence, our work comprises the absorption of ultra short pulsed laser radiation at a wavelength of 800 nm and pulse energies from 10 µJ to 50 µJ up to a delay of 6 ns. Our investigations reveal different absorption regimes like filamentation and moving breakdown as well as the formation of permanent modifications. Finally, the deposition of multiple pulses in the incubation regime is examined, observing a self-organizing absorption effect.

Hybrid lithography: combining UV-exposure and two photon direct laser writing.

We demonstrate a method for the combination of UV-lithography and direct laser writing using two-photon polymerization (2PP-DLW). First a dye doped photoresist is used for UV-lithography. Adding an undoped photoresist on top of the developed structures enables three-dimensional alignment of the 2PP-DLW structures by detecting the spatially varying fluorescence of the two photoresists. Using this approach we show three dimensional alignment by adding 3D structures made by 2PP-DLW to a previously UV-exposed structure. Furthermore, a fluidic system with an integrated total internal reflection mirror to observe particles in a microfluidic channel is demonstrated.