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l_(1)-based calibration of POD-Galerkin models of two-dimensional unsteady flows

Chinese Journal of Aeronautics 2021年第1期34卷 226-236页

作者： riccardo RUBINI Davide LASAGNA Andrea DA RONCH Faculty of Engineering and Physical Sciences University of SouthamptonSouthampton SO171BJUnited Kingdom

This paper discusses a physics-informed methodology aimed at reconstructing efficiently the fluid state of a ***,the generation of an accurate reduced order model of twodimensional unsteady flows from data leverages on sparsity-promoting statistical learning *** cornerstone of the approach is l_(1) regularised regression,resulting in sparselyconnected models where only the important quadratic interactions between modes are *** original dynamical behaviour is reproduced at low computational costs,as few quadratic interactions need to be *** approach has two key ***,interactions are selected systematically as a solution of a convex optimisation problem and no a priori assumptions on the physics of the flow are ***,the presence of a regularisation term improves the predictive performance of the original model,generally affected by noise and poor data *** cases are for two-dimensional lid-driven cavity flows,at three values of the Reynolds number for which the motion is chaotic and energy interactions are scattered across the *** is found that:(A)the sparsification generates models maintaining the original accuracy level but with a lower number of active coefficients;this becomes more pronounced for increasing Reynolds numbers suggesting that extension of these techniques to real-life flow configurations is possible;(B)sparse models maintain a good temporal stability for *** methodology is ready for more complex applications without modifications of the underlying theory,and the integration into a cyberphysical model is feasible.

关键词： Computational methods Dynamical systems Lid-driven cavity L_(1)-based regression Reduced order models Sparsification Stabilization of ROMs

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Multimodal nonlinear microscopy: A powerful label-free method for supporting standard diagnostics on biological tissues

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Journal of Innovative Optical Health Sciences 2014年第5期7卷 1-16页

作者： riccardo Cicchi Francesco Saverio Pavone National Institute of Optics National Research Council(INO-CNR)Largo E.Fermi6 50125 FlorenceItaly European Laboratory for Nonlinear Spectroscopy(LENS)University of Florence Sesto FiorentinoItaly Department of Physics University of Florence Sesto FiorentinoItaly International Center of Computational Neurophotonics(ICON)Florence Italy

The large use of nonlinear laser scanning microscopy in the past decade paved the way forpot ential clinical application of this imaging *** nonlinear microscopy techniquesoffer promising label-free solutions to improve diagnostic performances on *** particular,the combination of multiple nonlinear imaging techniques in the same microscope allows inte-grating_morphological with functional information in a morpho-functional *** provides a high-resolution label-free alternative to both histological and immunohis-tochemicai examination of tissues and is becoming increasingly popular among the ***,several technical improvements,including automatic scanning andimage analysis,are required before the technique represents a standard diagnostic *** thisreview paper,we highlight the capabilit ies of multimodal nonlinear microscopy for tissue inaging,by providing various examples on colon,arterial and skin *** comparison between images acquired using multimodal nonlinear microscopy and histology shows a good agreement bet ween the two *** results demonstrate that multimodal nonlinear microscopy is apowerful label-free alternative to standard histopathological methods and has the potential tofind a stable place in the clinical setting in the near future.

关键词： Non-linear microscopy tissue imaging.

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USB powered devices:A survey of side-channel threats and countermeasures

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High-Confidence Computing 2021年第1期1卷 12-23页

作者： Hao Liu riccardo Spolaor Federico Turrin riccardo Bonafede Mauro Conti School of Computer Science and Technology Shandong UniversityQingdaoChina Department of Mathematics University of PaduaPaduaItaly Department of Information Engineering University of PaduaPaduaItaly

Recent technological innovations lead to the rise of a plethora of portable electronic devices such as smartphones,small household appliances,and other IoT *** power or recharge the battery of such devices,manufac-turers identified in the ubiquitous Universal Serial Bus(USB)standard a convenient solution,as it enables both communication and energy ***,the default trust on USB ports has been exploited by hackers to extract highly sensitive user data on such *** the efforts by security experts and manufacturers to detect and block this threat,an even more stealthy approach to undermine users privacy relies on side-channel attacks on the USB interface,such as electromagnetic emissions and power *** this paper,we present a comprehensive survey of the state-of-the-art of side-channel analysis on the security of USB-powered *** from other surveys on USB-based attacks via the communication interface only,this survey considers research works that aim to infer or extract private information from the energy supply,the device itself,or unintentionally available *** particular,we consider this emergent trend of security work that was not previously considered in other surveys,such as the energy consumption and electromagnetic emission analyses,as well as Juice Filming Charging(JFC)*** first analyze the physical properties of the side-channels and technical characteristics of such research work,we then summarize the countermeasures proposed in the ***,we also identify some possible future directions to foster further research in this field.

关键词： Smart devices USB Side-channel Security

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A Numerical Study of Quantum Decoherence

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Communications in Computational Physics 2012年第6期12卷 85-108页

作者： riccardo Adami Claudia Negulescu Dipartimento di Matematica e Applicazioni Universita di Milano Bicoccavia R.Cozzi5320125 MilanoItaly CMI/LATP(UMR 6632) Universit´e de Provence39rue Joliot Curie13453 Marseille Cedex 13France

The present paper provides a numerical investigation of the decoherence effect induced on a quantum heavy particle by the scattering with a light *** time dependent two-particle Schr¨odinger equation is solved by means of a time-splitting *** damping undergone by the non-diagonal terms of the heavy particle density matrix is estimated numerically,as well as the error in the Joos-Zeh approximation formula.

关键词： Quantum mechanics Schr¨odinger equation heavy-light particle scattering interference decoherence numerical discretization numerical analysis splitting scheme

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Colletotrichum species and complexes:geographic distribution,host range and conservation status

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Fungal Diversity 2021年第5期110卷 109-198页

作者： Pedro Talhinhas riccardo Baroncelli LEAF-Linking Landscape EnvironmentAgriculture and Food-Research CentreAssociated Laboratory TERRAInstituto Superior de AgronomiaUniversidade de LisboaTapada da Ajuda1349-017 LisbonPortugal Department of Agricultural and Food Sciences(DISTAL) University of BolognaBolognaItaly

The taxonomy of the genus Colletotrichum has undergone tremendous changes over the last decade,with over 200 species being currently recognised and species complexes being informally used to cluster those *** of these species are important plant pathogens,some rather polyphagous and others host-specific,but several occur seldomly and some may in fact be ecologically *** mainly on literature from the past decade,in this work we review the occurrence,geographic distribution and host spectrum of currently recognised Colletotrichum species under phylogenetic,pathologi-cal/agronomic and ecological perspectives,providing a list arranged by Colletotrichum species and species complexes.A total of 257 species are listed and grouped into 15 species *** this work we have recorded 1353 unique host species-Colletotrichum species association records from 720 hosts,with the Fabaceae as the family with higher number of hosts(52 host species)but with the Rosaceae as the family with the highest number of host species-Colletotrichum species association records(118 association records).According to occurrence data,88 species are common in nature,128 were considered as data deficient and 41 are threatened,some of which are likely extinct from nature and preserved only in cul-ture *** species are relevant plant pathogens,in some cases geographically confined and thus of potential quarantine *** on the major changes that occurred on Colletotrichum taxonomy over the last decade,this work provides a comprehensive overview of occurrence data of Colletotrichum species,compiling host range and geographical distribution,with relevance for plant pathology and conservation *** current taxonomic framework in Colle-totrichum is revealing numerous species but poses challenges to the employment of standard criteria for the evaluation of biological conservation of these *** advocate that conservation mycology and taxonomy should

关键词： Colletotrichum Species complex Taxonomy Host range Geographic distribution Conservation mycology

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Emerging role of the KRAS-PDK1 axis in pancreatic cancer

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World Journal of Gastroenterology 2014年第31期20卷 10752-10757页

作者： riccardo Ferro Marco Falasca Queen Mary University of London Barts and The London School of Medicine and Dentistry Blizard Institute Inositide Signalling GroupUnited Kingdom

Pancreatic cancer is a highly aggressive tumour that is very resistant to treatments and it is rarely diagnosed early because of absence of specific symptoms. Therefore, the prognosis for this disease is very poor and it has the grim supremacy in terms of unfavourable survival rates. There have been great advances in survival rates for many types of cancers over the past few decades but hardly any change for pancreatic cancer. Mutations of the Ras oncogene are the most frequent oncogenic alterations in human cancers. The frequency of KRAS mutations in pancreatic cancer is around 90%. Given the well-established role of KRAS in cancer it is not surprising that it is one of the most attractive targets for cancer therapy. Nevertheless, during the last thirty years all attempts to target directly KRAS protein have failed. Therefore, it is crucial to identify downstream KRAS effectors in order to develop specific drugs able to counteract activation of this pathway. Among the different signalling pathways activated by oncogenic KRAS, the phosphoinositide 3-Kinase(PI3K) pathway is emerging as one of the most critical KRAS effector. In turn, PI3 K activates several parallel pathways making the identification of the precise effectors activated by KRAS/PI3 K more difficult. Recent data identify 3-phosphoinositide-dependent protein kinase 1 as a key tumour-initiating event downstream KRAS interaction with PI3 K in pancreatic cancer.

关键词： Pancreatic cancer Signal transduction KRAS Phosphoinositide 3-kinase 3-phosphoinositide-dependent protein kinase 1

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The coronavirus disease-19 pandemic and acute coronary syndrome:a specific impact in the elderly

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Journal of Geriatric Cardiology 2022年第5期19卷 325-334页

作者： ViktorČulić Ahmed AlTurki riccardo Proietti Department of Cardiology and Angiology University Hospital Centre SplitSplitCroatia University of Split School of Medicine SplitCroatia Division of Cardiology McGill University Health CentreMontrealQuebecCanada Liverpool Centre for Cardiovascular Science University of LiverpoolLiverpoolUnited Kingdom

The coronavirus disease-19(COVID-19)pandemic has dramatically burdened healthcare systems worldwide by creating new public health *** addition to the most prevalent presentation of COVID-19 with mild to moderate respiratory symptoms,which occasionally progresses to acute respiratory distress syndrome,cardiovascular complications of COVID-19 include arterial and venous thromboembolic events(pulmonary embolism,acute myocardial infarction(MI)and ischemic stroke),myocarditis/myocardial injury.

关键词： acute respiratory distress

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Central Schemes and Second Order Boundary Conditions for 1D Interface and Piston Problems in Lagrangian Coordinates

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Communications in Computational Physics 2010年第9期8卷 797-822页

作者： riccardo Fazio Giovanni Russo Department of Mathematics University of MessinaSalita Sperone 3198166 MessinaItaly Department of Mathematics and Computer Science University of CataniaViale Andrea Doria 695125 CataniaItaly

We study high-resolution central schemes in Lagrangian coordinates for the one-dimensional system of conservation laws describing the evolution of two gases in slab geometry separated by an *** using Lagrangian coordinates,the interface is transformed to a fixed coordinate in the computational domain and,as a consequence,the movement of the interface is obtained as a byproduct of the numerical *** main contribution is the derivation of a special equation of state to be imposed at the interface in order to avoid non-physical *** boundary conditions at the piston that guarantee second order convergence are *** compare the solution of the piston problem to other results available in the literature and to a reference solution obtained within the adiabatic approximation.A shock-interface interaction problem is also *** results on these tests are in good agreement with those obtained by other methods.

关键词： Lagrangian central schemes Euler equations interface conditions boundary conditions

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Giant multiphononic effects in a perovskite oxide

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npj Computational Materials 2023年第1期9卷 1352-1358页

作者： Claudio Cazorla Massimiliano Stengel JorgeÍñiguez riccardo Rurali Departament de Física Universitat Politècnica de CatalunyaCampus Nord B4-B5Barcelona 08034Spain Institut de Ciència de Materials de Barcelona ICMAB–CSICCampus UAB08193 BellaterraSpain ICREA-InstitucióCatalana de Recerca i Estudis Avançats 08010 BarcelonaSpain Materials Research and Technology Department Luxembourg Institute of Science and Technology(LIST)Avenue des Hauts-Fourneaux 5L-4362 Esch/AlzetteLuxembourg Department of Physics and Materials Science University of Luxembourg41 Rue du BrillL-4422 BelvauxLuxembourg

Perovskite oxides offer tremendous potential for applications in information storage and energy conversion,owing to a subtle interplay between their spin,charge,orbital and lattice degrees of ***,we further expand the possible range of perovskite oxides operation towards the fields of thermal management and thermal computing by exploiting an exceptional synergy between different ferroic *** propose dynamical control of the heat flow in a distinctive family of perovskite oxides obtained via the application of small electric(~10 kV/cm)and/or magnetic(~1 T)*** on first-principles simulations,we predict a relative heat conductivity variation of~100%in SrMnO_(3) thin films near room temperature resulting from a phase transition that involves huge changes in both the magnetization and electric *** disclosed giant multiphononic effects are fundamentally caused by anharmonic spin-phonon couplings that strongly influence the mean lifetime of phonons.

关键词： perovskite oxides exceptional

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Biaxial versus uniaxial strain tuning of single-layer MoS_(2)

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Nano Materials Science 2022年第1期4卷 44-51页

作者： Felix Carrascoso riccardo Frisenda Andres Castellanos-Gomez Materials Science Factory Instituto de Ciencia de Materiales de Madrid(ICMM-CSIC)28049Madrid Spain

Strain engineering has arisen as a powerful technique to tune the electronic and optical properties of twod imensional semiconductors like molybdenum disulfide(MoS_(2)).Although several theoretical works predicted that biaxial strain would be more effective than uniaxial strain to tune the band structure of MoS_(2),a direct experimental verification is still missing in the *** we implemented a simple experimental setup that allows to apply biaxial strain through the bending of a cruciform polymer *** used the setup to study the effect of biaxial strain on the differential reflectance spectra of 12 single-layer MoS_(2)flakes finding a redshift of the excitonic features at a rate between-40 meV/%and-110 meV/%of biaxial *** also directly compare the effect of biaxi al and uniaxial strain on the same single-layer MoS_(2)finding that the biaxial strain gauge factor is 2.3 times larger than the uniaxial strain one.

关键词： finding layer gauge

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