Flow-test device fits into restricted access passages

Test device using a mandrel with a collapsible linkage assembly enables a fluid flow sensor to be properly positioned in a restricted passage by external manipulation. This device is applicable to the combustion chamber of a rocket motor

eHealth technology in forensic mental healthcare:Recommendations for achieving benefits and overcoming barriers

While eHealth technologies such as web-based interventions, mobile apps, and virtual reality have the potential to be of added value for forensic mental healthcare, there is a gap between this potential and the current situation in practice. The goal of this study was to identify recommendations to bridge this gap. In total, 21 semi-structured interviews and 89 questionnaires were conducted in a Dutch forensic mental healthcare sample consisting of professionals, patients, and eHealth experts. Based on the broad range of identified recommendations, it can be concluded that attention should be paid to the characteristics of professionals, patients, technology, and the organization throughout the development, implementation and evaluation of eHealth

Exciton-relaxation dynamics in lead halides

We survey recent comprehensive studies of exciton relaxation in the crystals of lead halides. The luminescence and electron-spin-resonance studies have revealed that excitons in lead bromide spontaneously dissociate and both electrons and holes get self-trapped individually. Similar relaxation has been also clarified in lead chloride. The electron-hole separation is ascribed to repulsive correlation via acoustic phonons. Besides, on the basis of the temperature profiles of self-trapped states, we discuss the origin of luminescence components which are mainly induced under one-photon excitation into the exciton band in lead fluoride, lead chloride, and lead bromide.Comment: REVTeX, 5 pages, 5 figure

Micro-embossing of micro-structures in RSA-501 as mold inserts for the replication of micro-lens arrays

The production of mold inserts for the replication of micro-lens arrays through micro-embossing could be an alternative process route compared to diamond turning or milling in order to reduce time and costs. The rapidly solidified aluminum alloy RSA-501 is expected to form micro-structures with low surface roughness because of its ultra-fine grain structure. In micro-embossing challenges like elastic spring back effect, pile-ups, and forming accuracy depend on the material behavior. Therefore, RSA-501 was further characterized and the influence of polishing or flycutting on the material behavior was investigated. To further understand the grain and microstructure samples were sectioned along their cross and longitudinal directions. The grain structure of RSA-501 was oriented along the extrusion direction and the mean grain sizes were <1.00 μm. Furthermore, RSA-501 was micro-embossed to investigate the influence of the material behavior and surface preparation on the forming of micro-structures. The induced surface integrity through flycutting was not deep enough to influence the forming of micro-structures. Therefore, the workpiece surface can be prepared either by polishing or flycutting. When micro-embossing RSA-501, cross and longitudinal sections can be used. However, it is recommended to process the cross section because of its isotropic grain structure. It was shown that the curvature radius of micro-embossed concave structures differs from the tool radius. This is due to the elastic spring back effect. Since the embossed structure remains spherical, the spring back effect can be compensated by adjusting the tool radius

The Art Of Repairing - Or How To Teach Engineering Students Sustainable Design Principles

Project-based learning bridges the gap between theoretical training and practical applications. The motivation of students to participate is increased especially by working out real-life problems. To provide this kind of practical learning experience, we are establishing a repair project for broken, otherwise discarded, lab equipment. It will not only help to reduce waste and save money by repairing research equipment, but will also encourage interdisciplinary collaboration and innovation. Providing a space to learn about the underlying functional properties of various often highly specialized lab instruments, students identify malfunctions, deepen understanding of vulnerable designs, and discuss and perform strategies for repairing them under guidance, while collecting credit points. Through gaining a deep understanding of how these instruments work, students may even invent new strategies to realize similar tasks or add new features. This project builds on the findings from a 2021 pilot study. We discovered that by offering a repair project, students were able to gain a deeper understanding of theoretical concepts, improve their self-confidence as well as their motivation in learning, and increase their awareness of sustainable design. In the following, we are presenting the transformation of the pilot study into a current course concept. With weekly minievaluations we are monitoring students’ learning success towards their learning goals and share the results

Fostering Individual Learning Types On Online Learning Platforms To Strengthen Students\u27 Competencies

The availability of video lectures and hybrid formats in higher education has increased significantly due to the COVID-19 pandemic. Predominantly, however, instructional content has simply been translated 1-to-1 into video formats regardless of effectiveness and students\u27 needs. Interaction and diversity in content delivery were often missing. This practice paper presents an ongoing investigation on how lecture content can be presented within an online learning platform in order to meet the individual learning types of students and to address actual usage behaviour, potentially enabling a positive effect on learning outcomes. By creating learning paths, students can choose from different content modes, such as interactive video material, image hotspots and text material, and internalize the content according to their individual learning types. In addition, surveys are used to identify their motivation for choosing the content form as well as the extent to which this was helpful to successfully complete examination assignments. The results of the surveys will be analyzed and used for further improvements. Through the targeted use of different content modes, the positive aspects of online teaching can be furthered while strengthening the knowledge of the students individually in order to best prepare students for the complexity of a future work environment

Molecular dynamics simulation of gallium phosphide zincblende cutting mechanism

Gallium Phosphide (GaP) has a low machinability, due to high tool wear and the need to induce a High-Pressure Phase Transformation (HPPT). HPPT changes GaP crystallographic structure from zincblende to β-tin. The latter is ductile and metastable, therefore, rather than be experimentally observably, must be simulated using atomistic methods. In this work, Classic Molecular Dynamics Simulations (CMDS) were used to analyse GaP HPPT and tool wear mechanisms during the cutting process. Diamond tools were modelled with 10 nm cutting edge radius, -20º and -10º rake angles, and -10º clearance angle. The simulations revealed that the main shear mechanism involved stacking faults, planar dislocations within the crystal structure, while HPPT had a limited role, being restricted to the deformation zone. A more significant surface crack and tool amorphization were observed for a rake angle -10º