183 research outputs found
C. Appel. Provenzalische Chrestomathie mil Abriss der Formenlehre und Glossar ; zweite, verbesserte Auflage, Leipzig, O.R. Reisland, 1902
No full textAndraud Paul. C. Appel. Provenzalische Chrestomathie mil Abriss der Formenlehre und Glossar ; zweite, verbesserte Auflage, Leipzig, O.R. Reisland, 1902. In: Annales du Midi : revue archéologique, historique et philologique de la France méridionale, Tome 16, N°61, 1904. pp. 89-91
De l'air comprimé employé comme moteur, ou de la force obtenu gratuitement et mise en réserve dt
No full textvon Andraud und Tessié du Motay. Dt. von C. H. SchmidtIn Fraktu
Analyse électrophorétique des lipoprotéines sériques chez les animaux domestiques
No full textCuvelier R., Andraud G., Berger J.-A., Beaufrère , Bressou C. Analyse électrophorétique des lipoprotéines sériques chez les animaux domestiques. In: Bulletin de l'Académie Vétérinaire de France tome 111 n°5, 1958. pp. 207-221
A temperature and process compensation circuit for resistive-based in-memory computing arrays
No full textFunding Information: ACKNOWLEDGMENTS This work is supported by Academy of Finland projects EHIR (grant 13334487) and WHISTLE (grant 332218) Publisher Copyright: © 2023 IEEE.In-Memory Computing (IMC) architectures promise increased energy-efficiency for embedded artificial intelligence. Many IMC circuits rely on analog computation, which is more sensitive to process and temperature variations than digital. Thus, maintaining a suitable computation accuracy may require process and temperature compensation. Focusing on resistive-based IMC architectures, we propose an ultra-low power circuit to compensate for the temperature and process-based non-linearities of resistive computing elements. The proposed circuit, implemented in 65 nm CMOS can provide a temperature coefficient between 10 and 1938 ppm/°C for a wide temperature range (-40°C to 80°C) and output current range (few pA up to 600 nA) at 1.2 V operating voltage. Used in a resistive IMC array, the variation of output currents from each multiply-accumulate (MAC) operation can be reduced by up to 84% to maintain computation accuracy across process and temperature variations.Peer reviewe
A Self-Calibrated Activation Neuron Topology for Efficient Resistive-Based In-Memory Computing
No full textFunding Information: This work is supported by Academy of Finland projects EHIR (grant 13334487) and WHISTLE (grant 332218). Publisher Copyright: © 2023 IEEE.In-Memory Computing (IMC) accelerators based on resistive crossbars are emerging as a promising pathway toward improved energy efficiency in artificial neural networks. While significant research efforts are directed toward designing advanced resistive memory devices, the nonidealities associated with practical device implementation are often overlooked. Existing solutions typically compensate for these nonidealities during off-chip training, introducing additional complexities and failing to account for random errors such as noise, device failures, and cycle-to-cycle variability. To tackle this challenge, this work proposes a self-calibrated activation neuron topology that offers a fully online non-linearity compensation for IMC accelerators. The neuron merges multiply-accumulate operations with Rectified Linear Unit (ReLU) activation function in the analog domain for increased efficiency. The self-calibration is integrated into the data conversion process to minimize overheads and be fully online. The proposed activation neuron is designed and simulated using 22 nm FDSOI CMOS technology. The design demonstrates robustness across a wide temperature range (-40°C to 80°C) and under various process corners, with a maximum accuracy loss of 1 LSB for an 8-bit activation accuracy.Peer reviewe
Ancient Greek text concealed on the back of unrolled papyrus revealed through shortwave-infrared hyperspectral imaging
No full textOnly a few Herculaneum rolls exhibit writing on their reverse side. Since unrolled papyri are permanently glued to paperboard, so far, this fact was known to us only from 18th-century drawings. The application of shortwave-infrared (SWIR; 1000-2500 nm) hyperspectral imaging (HSI) to one of them (PHerc. 1691/1021) has revealed portions of Greek text hidden on the back more than 220 years after their first discovery, making it possible to recover this primary source for the ongoing new edition of this precious book. SWIR HSI has produced better contrast and legibility even on the extensive text preserved on the front compared to former imaging of Herculaneum papyri at 950 nm (improperly called multispectral imaging), with a substantial impact on the text reconstruction. These promising results confirm the importance of advanced techniques applied to ancient carbonized papyri and open the way to a better investigation of hundreds of other such papyri
On the origin of controlled anisotropic growth of monodisperse gold nanobipyramids
No full textWe elucidate the crucial role of the cetyl trimethylammonium bromide (CTAB) surfactant in the anisotropic growth mechanism of gold nano-bipyramids, nano-objects with remarkable optical properties and high tunability. Atomistic molecular dynamics simulations predict different surface coverages of the CTAB (positively charged) heads and their (bromide) counterions as function of the gold exposed surfaces. High concentration of CTAB surfactant promotes formation of gold nanograins in solution that work as precursors for the smooth anisotropic growth of more elongated nano-bipyramidal objects. Nanobipyramids feature higher index facets with respect to nanorods, allowing higher CTAB coverages that stabilize their formation and leading to narrower inter-micelles channels that smooth down their anisotropic growth. Absorption spectroscopy and scanning electron microscopy confirmed the formation of nanograins and demonstrated the importance of surfactant concentration on driving the growth towards nano-bipyramids rather than nanorods. The outcome explains the formation of the monodisperse bipyramidal nano-objects, the origin of their controlled shapes and sizes along with their remarkable stability
MOLECULAR HYPERPOLARIZABILITIES FROM VIBRATIONAL SPECTROSCOPY - POLYENOVANILLINS
No full textIn this work we have studied the vibrational (relaxation) contributions beta(r) and gamma(r) to molecular nonlinear optical (nlo) properties of polyenovanillins, a class of push-pull molecules with increasing number n of conjugated CC bonds (n = 1, 3, 4, 5). Both experiments and ab initio calculations have been carried out. The model adopted expresses the nuclear relaxation contributions in terms of vibrational spectroscopic observables, namely frequencies and infrared and Raman intensities. A relevant observation is that the electronic hyperpolarizability beta(e), measured from EFISH experiments or calculated by ab initio methods, turns out to be very similar to the experimental or ab initio vibrational beta(r). The same behavior has already been found (both for beta and gamma) in other polyconjugated low band-gap materials with large electron-phonon coupling. Moreover, the spectroscopic approach has the advantage of allowing useful insight into the role played by structural parameters in the nlo processes
Feathers iridescence sheds light on the assembly rules of humingbirds communities
No full textA recommendation – based on reviews by 2 anonymous reviewers – of the article: Gruson, H., Elias, M., Parra, J. L., Andraud, C., Berthier, S., Doutrelant, C., and Gomez, D. (2019). Distribution of iridescent colours in hummingbird communities results from the interplay between selection for camouflage and communication. BioRxiv, 586362, v5 peer-reviewed and recommended by PCI Evolutionary Biology. doi: 10.1101/586362. doi: 10.1101/58636
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