IRF: Institutional Repository FHNW (Hochschule für Wirtschaft FHNW)
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Visualizing ammonia combustion. From laminar flames to engine application
No full textAmmonia is one of the most promising future fuels for high-power combustion systems like large internal combustion engines and gas turbines. The number of publications and applications of ammonia combustion has increased rapidly in recent years. However, many phenomena of ammonia combustion remain unresolved and require further investigation. While fundamental experiments under laminar conditions show a very low reactivity of ammonia, the engine combustion of pure ammonia or ammonia with the addition of a small fraction of combustion promoters provides satisfactory combustion efficiency and stability. To gain a deeper understanding of the phenomena governing ammonia combustion, the LEC and FHNW have developed a methodology using a series of experimental setups to apply optical investigations ranging from quiescent, ambient conditions up to highly turbulent, engine-relevant conditions. The optical data furthermore provide an extraordinary wealth of information to develop and validate detailed simulation models. This paper presents the holistic concept for a methodology that allows the experimental distinction of the effects relevant to ammonia combustion. Concepts for measuring the laminar burning velocity, turbulent burning velocity, turbulent jet ignition, and turbulence-flame interaction under engine-like thermodynamic and flow conditions are described. For each stage of the methodology, a specific optical test rig is designed or adapted to meet the relevant requirements. Selected results are presented, which underline the unique combustion behavior of ammonia and ammonia/hydrogen blends and demonstrate the applicability of ammonia in internal combustion engines. Thermo diffusive instabilities are identified to have a decisive impact on the flame propagation of ammonia/air mixtures.The improvement of the combustion properties at high temperatures and pressures as well as high turbulence levels is reasoned with enhanced reactivity, strong turbulence-flame interaction, and the Lewis number effect. Future perspectives on the insights from optical data into ammonia combustion and the relevance of optical data for developing ammonia combustion models are derived
Ibervillea sonorae (S. Watson) Green a potential resource of bioactive compounds: Systematic analysis of a Mexican plant used in traditional medicine
No full textIbervillea sonorae (S. Watson) Green (Cucurbitaceae) is a tuber succulent known as “wareke,” which grows in dry desert landscapes in northwestern Mexico and the southwestern United States. Indigenous tribes use I. sonorae as a remedy against cancer, inflammation, rheumatism, skin infections, and diabetes. The great popularity of wareke in traditional medicine has motivated various working groups to investigate its pharmacological properties. The antiproliferative, antitumoral, antifungal, hypoglycemic, antiinflammatory, antioxidant, and antimicrobial potential of this plant has been established. Chemical studies showed that I. sonorae is a potential resource of bioactive compounds, cucurbitacin-type triterpenoids, and phytosterols, the main secondary metabolites. The objective of this chapter is to systematically analyze the phytochemical knowledge of the plant (isolated and identified compounds), describe the biological activities of different extracts, isolated ingredients, and phytopreparations, and discuss their possible applications
Safe Spaces für Sterbende oder Erinnerungsorte für die Opfer der Aids-Epidemie in der Schweiz
No full textStrategic Update Development: Optimizing Current Locker Solutions & Strengthening Competitive Advantage in the Swiss Healthcare Sector
No full textSwiss healthcare facilities face significant challenges in managing storage solutions for employees and patients. Common issues include limited space, poor ventilation, inefficient laundry systems, and inadequate features for secure and hygienic storage. Zippsafe AG, known for its space-efficient locker systems, seeks to address these challenges while identifying new opportunities for innovation and differentiation in a competitive market
Female academic entrepreneurship at Swiss universities. Promotion of female spin-off intentions and activities
No full textDie vernetzte Angebotswelt. Transformation im Handel verstehen
No full textDie Welt des Handels verändert sich grundlegend. Alte Strukturen und starre Rollen lösen sich auf. Innovative Formen der Interaktion und Zusammenarbeit führen zu neuen Konstellationen im Vertrieb von Konsumgütern. Das Buch zeigt und erläutert das Bild der vernetzten Angebotswelt, das in der fünfzehnjährigen Studienreihe (E-)Commerce Report Schweiz entwickelt wurde. Es thematisiert den Stellenwert und Einfluss digitaler Plattformen auf die traditionellen Strukturen der Distribution. Eine Standortbestimmung reflektiert die aktuelle Situation für Hersteller, Marken, Gross- und Einzelhandel. Das Buch richtet sich an zukunftsorientierte Berufsleute, den Berufsnachwuchs und an Studierende
Kompetenz statt Kontrolle. Plagiatssoftware auf dem Prüfstand
No full textBei der Plagiatsprävention plädieren wir für einen kompetenzorientierten Ansatz und beleuchten das Spannungsfeld zwischen rechtlichen, technischen und qualitativen Aspekten des wissenschaftlichen Schreibens. Anstatt auf Kontrolle durch technische Tools zu setzen, möchten wir bei den Studierenden einen kritischen, reflektierten und verantwortungsvollen Umgang mit digitalen Technologien fördern
Zur Konzeption und Durchführung eines Schulleitungsmonitorings im deutschsprachigen Bildungsraum – Chancen und Grenzen
No full textZiel des Beitrags ist es, wichtige Schritte für die Konzipierung und Realisierung des Schullei-tungsmonitors zu beschreiben (u. a. Implementierung, Adressat:innen bzw. Rezipient:innen so-wie Disseminationsstrategie). Insbesondere verdeutlichen die aktuellen Ergebnisse einen län-derübergreifenden Bedarf an Vorabqualifizierung sowie an Fort- und Weiterbildung für Schullei-ter:innen, da es gerade in dieser Hinsicht deutliche Unterschiede zwischen Deutschland, der Schweiz und Österreich gibt. Ausgehend von dieser Darstellung wird der Schulleitungsmonitor anhand allgemeiner Merkmale von Bildungsmonitoringstudien erörtert, und zwar dahingehend, in welcher Hinsicht sich das Verfahren von den bereits vorliegenden und üblichen Varianten eines Bildungsmonitorings unterscheidet: So gibt es beim Schulleitungsmonitor beispielsweise keine Accountability-Komponente
Social Engineering with ChatGPT
No full textThe study begins by examining the primary ways ChatGPT can be manipulated to support social engineering attacks, including techniques such as jailbreak, reverse psychology, and prompt injection. It then proposes and develops countermeasures to detect and prevent these AI-driven threats. A comprehensive literature review identifies existing research gaps and informs the development of a novel risk identification process tailored to mitigate AI-enhanced social engineering risks