353 research outputs found
Anomalie: le galle come curiose relazioni interspecifiche
No full textIl capitolo tratta delle galle come relazioni interspecie che nella storia della cecidologia sono state concepite inizialmente come patologie e in seguito come possibilità di coesistenza e simbiosi
Le cecidologhe della collezione Trotter: Jenny Docters Van Leeuwen-Reijnvaan e Eva Mameli Calvino
No full textIl capitolo ritraccia il percorso di due botaniche, Jenny Docters van Leeuwen-Reijvaan e eva mameli Calvino, che hanno contribuito alla storia della cecidologi
Viaggio nella storia naturale delle galle: una sfida per le scienze del vivente
No full textIl capitolo ricostruisce il dibattito sulla natura delle galle e la nascita della "cecidologia", con particolare attenzione al contributo di Caro Massalongo (1852-1928) e Alessandro Trotter (1874-1967)
Il microcosmo delle galle. La collezione di Alessandro Trotter
No full textLe galle sono piccole protuberanze vegetali che si formano sulle piante per l’azione di altri organismi viventi, come insetti e acari. Tra le più complesse e curiose forme di interazione animale-pianta, le galle hanno affascinato generazioni di naturalisti. Difficile pensare che il loro studio sarebbe divenuto, alla fine del XIX secolo, l’oggetto di una vera e propria scienza, la “cecidologia”, al confine tra botanica e zoologia. Ne era convinto Alessandro Trotter (1874-1967) che di questa disciplina fu uno dei principali rappresentanti in Italia. Nell’arco di circa cinquant’anni di attività, dal 1890 al 1940, egli riunì una straordinaria collezione oggi conservata al Museo botanico dell’Università di Padova. La mostra racconta alcune delle storie racchiuse nei “microcosmi” delle sue galle: storie di relazioni – tra piante e animali, ma anche tra i molti naturalisti e naturaliste che, come Trotter, si lasciarono affascinare dalle meravigliose metamorfosi degli esseri viventi e dei loro ambienti
THE EFFECT OF FINTECH INVESTMENTS ON LISTED BANKS: EVIDENCE FROM AN ITALIAN SAMPLE
No full textThis paper analyses whether and how investments in financial technology (FinTech) affect performance, risk, and value of listed Italian banks. This paper tests the effect of return on equity (ROE) and capital asset pricing model (CAPM) Beta coefficient — and, secondly, of the price-to-book value (PBV) ratio, on a sample of 17 Italian listed banks from 2013 to 2019, representing the largest institutions operating in the Italian banking industry. The FinTech variable is declined into two different statuses: digital active banks and digital-focused banks. The study adds useful insights to the positive effects of innovation on banks’ value, in a market, like the Italian one, where investments in FinTech have spread in recent years. Controlling for other financial statements and market variables, the presence of FinTech investments does not affect the CAPM Beta coefficient, while the relationship is positive and significant with ROE for digital active banks only, and with the PBV for digital-focused banks. These results confirm a positive effect on performance for banks investing in FinTech, while greater expectations from investors and a positive effect on bank value creation are significant for digital-focused banks only
Decision-Theoretic Design Space Exploration of Multiprocessor Platforms
No full textThis paper presents an efficient technique to perform design space exploration of a multiprocessor platform that minimizes the number of simulations needed to identify a Pareto curve with metrics like energy and delay. Instead of using semi-random search algorithms (like simulated annealing, tabu search, genetic algorithms, etc.), we use the domain knowledge derived from the platform architecture to set-up the exploration as a discrete-space Markov decision process. The system walks the design space changing its parameters, performing simulations only when probabilistic information becomes insufficient for a decision. A learning algorithm updates the probabilities of decision outcomes as simulations are performed. The proposed technique has been tested with two multimedia industrial applications, namely the ffmpeg transcoder and the parallel pigz compression algorithm. Results show that the exploration can be performed with 5% of the simulations necessary for the most used algorithms (Pareto simulated annealing, nondominated sorting genetic algorithm, etc.), increasing the exploration speed by more than one order of magnitude
ReSP: A Nonintrusive Transaction-Level Reflective MPSoC Simulation Platform for Design Space Exploration
No full textCost of Capital for Private Firms
No full textThis paper elaborates on a new default-based cost of capital estimation for pri- vate-held firms. We test the model’s ability to incorporate systematic risk and size premium. Results highlight a positive and statistically significant effect of CAPM expected return and size premiums on this novel cost of capital meas- ure. Beyond the utility in practice for private equity valuation, preliminary re- sults are promising for application on a larger cross-country sample
The Natures of Digital Practices. People, Objects, and Data Mobilities in Natural History Collections
No full textNatural history collections play a vital role in biodiversity conservation, climate monitoring, and public health protection. However, challenges such as the loss of historical collections in museums, the crisis in taxonomic research, and the decline of sampling activities have compromised their integrity. Can digitisation offer solutions to these issues? On the one hand, this multidisciplinary Focus explores the role of digital practices in managing natural history collections and the contribution made by the humanities and social sciences. On the other, it examines the impact of ‘digital natural history objects’ on the history of science and museum studies. Topics include the digitisation process, the relationship between physical and digital objects, social aspects of digitisation projects, and potential biases in digital platforms. The contribution of archival sources to the study of natural history collections and decolonising practices are also discussed
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