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Papyrus : the invention of books in the ancient world
\"Papyrus is an enthralling journey through the history of books and libraries in the ancient world and those who have helped preserve their rich literary traditions. Long before books were mass-produced, those made of reeds from along the Nile were worth fighting and dying for. Journeying along the battlefields of Alexander the Great, beneath the eruptions of Mount Vesuvius, at Cleopatra's palaces and the scene of Hypatia's murder, award-winning author Irene Vallejo chronicles the excitement of literary culture in the ancient world, and the heroic efforts that ensured this extraordinary tradition would continue. Weaved throughout are fascinating stories about the spies, scribes, illuminators, librarians, booksellers, authors, and statesmen whose rich and sometimes complicated engagement with the written word bears remarkable similarities to the world today: Aristophanes and the censorship of the humorists, Sappho and the empowerment of women's voices, Seneca and the problem of a post-truth world. Vallejo takes us to mountainous landscapes and the roaring sea, to the capitals where culture flourished and the furthest reaches where knowledge found refuge in chaotic times. In this sweeping tour of the history of books, the wonder of the ancient world comes alive and, along the way, we discover the singular power of the written word\"-- Provided by publisher
Book
The Idea of the Library in the Ancient World
The Idea of the Library in the Ancient World takes the reader not just to Alexandria, the home of the famed library of Greco‐Roman antiquity, but far beyond it. Reading across antiquity from the fifth century BCE to the ninth century CE with Photius, the Byzantine scholar, this study recognizes that ‘library’ in antiquity comes in various forms and shapes. It can be a building with books, but it can also be individual people and individual books themselves. Its functions in antiquity are also numerous. The library is an instrument of power, of memory, of which it has various modes; it is an articulation of a political ideal, an art gallery, a place for social intercourse. The book indirectly raises issues about the contemporary library as a collection and in this way it demonstrates that antiquity offers insight into the topics that the library now raises.
eBook
Christianity and the transformation of the book : Origen, Eusebius, and the library of Caesarea
When early Christians began to study the Bible, and to write their own history and that of the Jews whom they claimed to supersede, they used scholarly methods invented by the librarians and literary critics of Hellenistic Alexandria. But Origen and Eusebius, two scholars of late Roman Caesarea, did far more. Both produced new kinds of books, in which parallel columns made possible critical comparisons previously unenvisioned, whether between biblical texts or between national histories. Eusebius went even farther, creating new research tools, new forms of history and polemic, and a new kind of library to support both research and book production.
Christianity and the Transformation of the Book combines broad-gauged synthesis and close textual analysis to reconstruct the kinds of books and the ways of organizing scholarly inquiry and collaboration among the Christians of Caesarea, on the coast of Roman Palestine. The book explores the dialectical relationship between intellectual history and the history of the book, even as it expands our understanding of early Christian scholarship. Christianity and the Transformation of the Book attends to the social, religious, intellectual, and institutional contexts within which Origen and Eusebius worked, as well as the details of their scholarly practices--practices that, the authors argue, continued to define major sectors of Christian learning for almost two millennia and are, in many ways, still with us today.,
eBook
Papyrus : the invention of books in the ancient world
\"Papyrus is an enthralling journey through the history of books and libraries in the ancient world and those who have helped preserve their rich literary traditions. Long before books were mass-produced, those made of reeds from along the Nile were worth fighting and dying for. Journeying along the battlefields of Alexander the Great, beneath the eruptions of Mount Vesuvius, at Cleopatra's palaces and the scene of Hypatia's murder, award-winning author Irene Vallejo chronicles the excitement of literary culture in the ancient world, and the heroic efforts that ensured this extraordinary tradition would continue. Weaved throughout are fascinating stories about the spies, scribes, illuminators, librarians, booksellers, authors, and statesmen whose rich and sometimes complicated engagement with the written word bears remarkable similarities to the world today: Aristophanes and the censorship of the humorists, Sappho and the empowerment of women's voices, Seneca and the problem of a post-truth world. Vallejo takes us to mountainous landscapes and the roaring sea, to the capitals where culture flourished and the furthest reaches where knowledge found refuge in chaotic times. In this sweeping tour of the history of books, the wonder of the ancient world comes alive and, along the way, we discover the singular power of the written word\"-- Provided by publisher.
Book
Interleaved non-isolated high step-up DC/DC converter based on the diode–capacitor multiplier
A kind of interleaved non-isolated high step-up DC/DC converter is presented in this study. The converter consists of two basic Boost cells and some diode–capacitor multiplier (DCM) cells as needed. Because of the DCM cells, the voltage conversion ratio is enlarged and the extreme large duty ratio can be avoided in the high step-up applications. Moreover, the voltage stress of all the power devices is greatly lower than the output voltage. As a result, lower-voltage-rated power devices can be employed, and higher efficiency can be expected. Since the two basic Boost cells are controlled by the interleaving method, which means the phase difference between the two pulse width moderlation (PWM) signals is 180° and the input current is the sums of the two inductor currents, the input current ripple is decreased and the size of the input filter could be reduced, which make it a suitable choice in the photovoltaic power generation system and hybrid electric vehicles, etc. Finally, the experimental results from a 300 W, 30–400 V laboratory prototype are presented to validate the effectiveness of the proposed converter.
Journal Article
Pockels soliton microcomb
Kerr soliton microcombs have recently emerged as a prominent topic in integrated photonics and have enabled new horizons for optical frequency metrology. Kerr soliton microcombs, as the name suggests, are based on high-order cubic optical nonlinearity. It is desirable to exploit quadratic photonic materials, namely Pockels materials, for soliton generation and on-chip implementation of 1f–2f comb self-referencing. Such quadratically driven solitons have been proposed theoretically, but have not yet been observed in a nanophotonic platform, despite recent progress in quadratic comb generation in free-space and crystalline resonators. Here, we report photonic-chip-based Pockels microcomb solitons driven by three-wave mixing in an aluminium nitride microring resonator. In contrast to typical Kerr solitons, the Pockels soliton features unity soliton generation fidelity, two-by-two evolution of multi-soliton states, favourable tuning dynamics and high pump-to-soliton conversion efficiency.Photonic-chip-based microcomb solitons driven by Pockels nonlinearity—the quadratic χ(2) effect—instead of the Kerr soliton are demonstrated in an aluminium nitride microring resonator with a conversion efficiency of 17%.
Journal Article
Ultrafast and energy-efficient all-optical switching with graphene-loaded deep-subwavelength plasmonic waveguides
All-optical switches have attracted attention because they can potentially overcome the speed limitation of electric switches. However, ultrafast, energy-efficient all-optical switches have been challenging to realize owing to the intrinsically small optical nonlinearity in existing materials. As a solution, we propose the use of graphene-loaded deep-subwavelength plasmonic waveguides (30 × 20 nm2). Thanks to extreme light confinement, we have greatly enhanced optical nonlinear absorption in graphene, and achieved ultrafast all-optical switching with a switching energy of 35 fJ and a switching time of 260 fs. The switching energy is four orders of magnitude smaller than that in previous graphene-based devices and is the smallest value reported for any all-optical switch operating at a few picoseconds or less. This device can be efficiently connected to conventional silicon waveguides and used in silicon photonic integrated circuits. We believe that this graphene-based device will pave the way towards on-chip ultrafast and energy-efficient photonic processing.
Journal Article