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Nanofluid-Enhanced HVAC&R Systems (2015–2025): Experimental, Numerical, and AI-Driven Insights with a Strategic Roadmap
No full textHeating, ventilation, air conditioning, and refrigeration (HVAC&R) systems account for a significant share of global energy demand, prompting intensive research into advanced thermal enhancement techniques. Among these, nanofluids—colloidal suspensions of nanoparticles in base fluids—have shown promise in boosting heat transfer performance. This review provides a structured and critical evaluation of nanofluid applications in HVAC&R systems, synthesizing research published from 2015 to 2025. A total of 200 peer-reviewed articles were selected from an initial pool of over 900 through a systematic filtering process. The selected literature was thematically categorized into experimental, numerical, hybrid, and AI/ML-based studies, with further classification by fluid type, performance metrics, and system-level relevance. Unlike prior reviews focused narrowly on thermophysical properties or individual components, this work integrates recent advances in artificial intelligence and hybrid modeling to assess both localized and systemic enhancements. Notably, nanofluids have demonstrated up to a 45% improvement in heat transfer coefficients and up to a 51% increase in the coefficient of performance (COP). However, the review reveals persistent gaps, including limited full-system validation, underexplored real-world integration, and minimal use of AI for holistic optimization. By identifying these knowledge gaps and research imbalances, this review proposes a forward-looking, data-driven roadmap to guide future research and facilitate the scalable adoption of nanofluid-enhanced HVAC&R technologies
National Culture, Institutional Quality, and Financial Development: International Evidence Before and After Financial Crisis
Full text linkThis study examines the impact of Hofstede’s six cultural dimensions and institutional quality on financial development in the periods preceding and following the global financial crisis. The study analyzes data from 33 countries spanning 2001 to 2021 using a combination of OLS, two-stage GMM, and PVAR models and concludes that inflation and economic growth negatively, and exchange rate and institutional quality positively significantly enhance financial development. Countries characterized by low masculinity and uncertainty avoidance scores, alongside high individualism and indulgence scores, tend to exhibit greater financial development. The results also indicate that cultural factors ought to be regarded as dynamic modifiers of financial development. National culture and institutional quality have a consistent influence on financial development pre- as well as post-crisis periods. Policymakers must recognize the significance of both formal and informal institutions in fostering an environment that promotes financial development and growth. A strategic integration of diverse cultural identities and values will confer a competitive advantage to nations. The effective management of cultural diversity and openness is crucial for attracting new investment, fostering innovation, comprehending the needs and skills of the workforce, and promoting financial development
44th Annual Nashville Conference on African-American History and Culture ( 2025)
No full textCoverage of the 44th Annual, Nashville Conference on African-American History and Culture; facilitated by Tennessee State University\u27s College of Liberal Arts and the Metropolitan Historical Commission on Friday, February 14th 2025.https://digitalscholarship.tnstate.edu/ncaahc-videos/1013/thumbnail.jp
Self-Thickening Materials Derived from Phenylpropanoid Ene Reactions
Full text linkIn this work, we report the observation of uncatalyzed ene reactions between several phenylpropanoid compounds and diethyl azodicarboxylate (DEAD). For allylbenzene, the reaction produces the ene product at molar ratios of up to 1:2 of allylbenzene to DEAD. At higher levels of DEAD, more complex reactions are observed. For the reaction between methyl eugenol and DEAD, similar ene reaction products have been found. However, the reaction of eugenol with DEAD is more complex; in addition to the ene reaction, other reactions happen at the same time. Most of the structures of the resulting products have been elucidated using NMR spectroscopy (1H, 13C, and 2D), and the findings have been further corroborated by FTIR analysis. Interestingly, these products appear to undergo molecular aggregation, which results in self-thickening in their neat form. However, the viscosity significantly decreases upon dilution with a solvent. This self-thickening property suggests their potential use as thickening agents in organic solvent formulations