Festschrift für Heinz Bude zu seiner Entpflichtung

Der vorliegende Band hat Beiträge von Weggefährtinnen und -gefährten von Heinz Bude versammelt. Heinz Bude war seit 2000 bis zu seiner Abschiedsvorlesung am 24.05.2023 Professor für Makrosoziologie an der Universität Kassel

Enhanced Avalanche Safety

Friåkning, att jaga orörd pudersnö utanför skidområdets gränser, är en extremsport förknippad med många risker. Laviner är en av dem. Intresset för friåkning ökar ständigt vilket leder till fler som är exponerade för fara och stigande olyckssiffror. Lavinrisken beror på många faktorer; till exempel väder, terräng och väderstreck medan grupptryck och kommunikationssvårigheter påverkar skidåkarens beslutsfattande negativt. Mitt mål var att hjälpa skidåkaren förstå riskerna medan den åker skidor för att undvika lavinolyckor. Genom en enketundersökning och intervjuer med experter på området samt fokusgrupp har jag lokaliserat de största problemen vilka har blivit grundpelarna i mitt slutgiltiga koncept. Resultatet är Avoid. En tjänst som skickar notiser till skidåkaren, i realtid, om vilka risker den är utsatt för baserat på skidåkarens GPS-position, lavinprognosen och terrängdata. Genom påminnelser om planering och säkerhetsutrustning, ett adderat riskfilter på kartan, kommunikationshjälpmedel och riskinformation blir det lättare för skidåkaren att fatta kloka beslut och välja säkrare alternativ

Microscale 3D Printing and Tuning of Cellulose Nanocrystals Reinforced Polymer Nanocomposites

The increasing demand for functional materials and an efficient use of sustainable resources makes the search for new material systems an ever growing endeavor. With this respect, architected (meta-)materials attract considerable interest. Their fabrication at the micro- and nanoscale, however, remains a challenge, especially for composites with highly different phases and unmodified reinforcement fillers. This study demonstrates that it is possible to create a non-cytotoxic nanocomposite ink reinforced by a sustainable phase, cellulose nanocrystals (CNCs), to print and tune complex 3D architectures using two-photon polymerization, thus, advancing the state of knowledge toward the microscale. Micro-compression, high-res scanning electron microscopy, (polarised) Raman spectroscopy, and composite modeling are used to study the structure-property relationships. A 100% stiffness increase is observed already at 4.5 wt% CNC while reaching a high photo-polymerization degree of ≈80% for both neat polymers and CNC-composites. Polarized Raman and the Halpin-Tsai composite-model suggest a random CNC orientation within the polymer matrix. The microscale approach can be used to tune arbitrary small scale CNC-reinforced polymer-composites with comparable feature sizes. The new insights pave the way for future applications where the 3D printing of small structures is essential to improve performances of tissue-scaffolds, extend bio-electronics applications or tailor microscale energy-absorption devices

Microscale 3D Printing and Tuning of Cellulose Nanocrystals Reinforced Polymer Nanocomposites

The increasing demand for functional materials and an efficient use of sustainable resources makes the search for new material systems an ever growing endeavor. With this respect, architected (meta-)materials attract considerable interest. Their fabrication at the micro- and nanoscale, however, remains a challenge, especially for composites with highly different phases and unmodified reinforcement fillers. This study demonstrates that it is possible to create a non-cytotoxic nanocomposite ink reinforced by a sustainable phase, cellulose nanocrystals (CNCs), to print and tune complex 3D architectures using two-photon polymerization, thus, advancing the state of knowledge toward the microscale. Micro-compression, high-res scanning electron microscopy, (polarised) Raman spectroscopy, and composite modeling are used to study the structure-property relationships. A 100% stiffness increase is observed already at 4.5 wt% CNC while reaching a high photo-polymerization degree of ≈80% for both neat polymers and CNC-composites. Polarized Raman and the Halpin-Tsai composite-model suggest a random CNC orientation within the polymer matrix. The microscale approach can be used to tune arbitrary small scale CNC-reinforced polymer-composites with comparable feature sizes. The new insights pave the way for future applications where the 3D printing of small structures is essential to improve performances of tissue-scaffolds, extend bio-electronics applications or tailor microscale energy-absorption devices

General relativity and the growth of a sub-discipline “gravitation” in Germany

The growth of research on general relativity in Germany from its origin in 1915 to the beginning of the 1990s is described. A gradual evolution from research done by single physicists and mathematicians to the eventual institutionalizion in the form of a research institute and subdivision of physical society is brought into focus