Illuminating Leonardo offers new contributions from major scholars of Leonardo da Vinci covering all aspects of his genius, including his manuscripts and their aftermath, and the various fields of ...art and science.
Dual mode imaging in the mid infrared band, a joint use of thermography and quasi-thermal reflectography, was recently proposed as a full field diagnostic tool in cultural heritage. Here we discuss ...for the first time, to the best of our knowledge, a detailed application of such non destructive technique to the diagnostics of frescoes, with an emphasis on the location of detachments. We also investigate the use of a thermographic method based on TSR (thermal signal reconstruction), in a long pulse stimulus scheme, as well as the spatial registration of thermal images after post-processing analysis to their visible counterpart, so as to obtain a fine resolution diagnostic map. As an exemplar case study, we report about the application of dual mode imaging with a 500 Formula: see text pixel size at object plane on the "Monocromo", a fresco by Leonardo da Vinci located in the Sforza Castle (Milan, Italy). Our technique was used to guide the conservators during the restoration works, opening new perspectives in artwork diagnostics.
Mona Lisa Kemp, Martin; Pallanti, Giuseppe
2017, 2017-06-08
eBook
The true story of the Mona Lisa - the people behind it, how Leonardo painted it and what it meant to him, and its fortunes in the centuries since. Read this book and the world's most famous image ...will never look the same again.
Fozi-Jones demonstrates by reframing of Romanesque "portraits" as avatars or representatives for generations of the book's users. The Helmarshausen Psalter has long been characterized as the "little ...sister" of another, far more famous twelfth-century manuscript: The Gospels of Henry the Lion. The latter shot to celebrity status when it was auctioned at Sotheby's for 140,000 British pounds in 1983, becoming the world's most expensive book--a title it maintained until 1994, when Bill Gates purchased Leonardo da Vinci's Codex Leicester. While Gates's interest in Leonardo reflected an appreciation for the history of science, and perhaps a desire to connect his own reputation as a "genius" to that of a universally acclaimed Renaissance man, the appeal of the Gospel book was rooted in a very different set of factors.
Prin toate compartimentele sale, dicţionarul se adresează unui public larg, compus din elevi, studenţi, traducători, cadre didactice, jurnalişti, cercetători, scriitori, cititori interesaţi de ...utilizarea corectă a limbii române şi de corespondenţele care se stabilesc între limba maghiară şi limba română. Numele autorului reprezintă prin el însuşi un garant al calităţii şi al utilităţii lucrării, ştiute fiind colaborările apropiate ale profesorului cu îndelungată experienţă cu şcolile cu predare în limba română din Ungaria, cu cele de limbă maghiară din România şi aplecarea de care dă dovadă faţă de nevoile reale ale elevilor şi studenţilor în ceea ce priveşte învăţarea limbii române, dar nu numai. În concluzie, Farkas Jeno nu propune o simplă carte care să servească drept suport pentru praf într-o bibliotecă, cum, din păcate, ajung atâtea altele, ci oferă un instrument de lucru util în cel mai înalt nivel cu putinţă, care depăşeşte cu mult limitele necesităţilor didactice.
This article presents an overview of the dynamics of the human heart and the main goal is the discussion of its fluid mechanic features. We will see, however, that the flow in the heart can not be ...fully described without considering its electrophysiology and elastomechanics as well as the interaction with the systemic and pulmonary circulations with which it is strongly connected. Biologically, the human heart is similar to that of all warm-blooded mammals and it satisfies the same allometric laws. Since the Paleolithic Age, however, humans have improved their living conditions, have modified the environment to satisfy their needs and, more recently, have developed advanced medical knowledge which has allowed triple the number of heartbeats with respect to other mammals. In the last century, effective diagnostic tools, reliable surgical procedures and prosthetic devices have been developed and refined leading to substantial progress in cardiology and heart surgery with routine clinical practice which nowadays cures many disorders, once lethal. Pulse duplicators have been built to reproduce the pulsatile flow and ‘blood analogues’, have been realized. Heart phantoms, can attain deformations similar to the real heart although the active contraction and the tissue anisotropy still can not be replicated. Numerical models have also become a viable alternative for cardiovascular research: they do not suffer from limitations of material properties and device technologies, thus making possible the realization of truly digital twins. Unfortunately, a high-fidelity model for the whole heart consists of a system of coupled, nonlinear partial differential equations with a number of degrees of freedom of the order of a billion and computational costs become the bottleneck. An additional challenge comes from the inherent human variability and the uncertainty of the heart parameters whose statistical assessment requires a campaign of simulations rather than a single deterministic calculation; reduced and surrogate models can be employed to alleviate the huge computational burden and all possibilities are currently being pursued. In the era of big data and artificial intelligence, cardiovascular research is also advancing by exploiting the latest technologies: equation-based augmented reality, virtual surgery and computational prediction of disease progression are just a few examples among many that will become standard practice in the forthcoming years.
The 2021 Nobel Prize in Physics recognizes advances in the understanding of complex systems, and underscores that ‘complex’ does not mean ‘imponderable’.
This paper accounts for the diagnostic campaign aimed at understanding the phenomenon of black stains appeared on the passepartout close to the margins of Folio 843 of Leonardo da Vinci's Codex ...Atlanticus. Previous studies excluded microbiological deterioration processes. The study is based on a multi-analytical approach, including non-invasive imaging measurements of the folio, micro-imaging and synchrotron spectroscopy investigations of passepartout fragments at different magnifications and spectral ranges. Photoluminescence hyperspectral and lifetime imaging highlighted that black stains are not composed of fluorescent materials. μATR-FTIR imaging of fragments from the passepartout revealed the presence of a mixture of starch and PVAc glues localized only in the stained areas close to the margin of the folio. FE-SEM observations showed that the dark stains are localized inside cavities formed among cellulose fibers, where an accumulation of inorganic roundish particles (∅100-200 nm in diameter size), composed of Hg and S, was detected. Finally, by employing synchrotron μXRF, μXANES and HR-XRD analyses it was possible to identify these particles as metacinnabar (β-HgS). Further research is needed to assess the chemical process leading to the metacinnabar formation in the controlled conservation condition of Leonardo's Codex.
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