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A call for enhanced data-driven insights into wind energy flow physics

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Theoretical & Applied Mechanics Letters 2024年第1期14卷 6-10页

作者： Coleman Moss Romit Maulik giacomo Valerio Iungo Wind Fluids and Experiments(WindFluX)Laboratory Mechanical Engineering DepartmentThe University of Texas at DallasRichardson 75080USA College of Information Sciences and Technology The Pennsylvania State UniversityState College 16801USA

With the increased availability of experimental measurements aiming at probing wind resources and wind turbine operations,machine learning(ML)models are poised to advance our understanding of the physics underpinning the interaction between the atmospheric boundary layer and wind turbine arrays,the generated wakes and their interactions,and wind energy ***,the majority of the existing ML models for predicting wind turbine wakes merely recreate Computational fluid dynamics(CFD)simulated data with analogous accuracy but reduced computational costs,thus providing surrogate models rather than enhanced data-enabled physics *** ML-based surrogate models are useful to overcome current limitations associated with the high computational costs of CFD models,using ML to unveil processes from experimental data or enhance modeling capabilities is deemed a potential research direction to *** this letter,we discuss recent achievements in the realm of ML modeling of wind turbine wakes and operations,along with new promising research strategies.

关键词： Machine learning Wake Wind turbine Wind farm Supervisory control and data acquisition

Earnings Inequality in Germany and Its Implications

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Economic and Political Studies 2015年第2期3卷 60-84页

作者： giacomo CORNEO the Department of Economics Free University of Berlin

The current paper discusses the evolution of earnings inequality in Germany with an eye to its potential lessons for China. Inequality is assessed from two different perspectives: the distribution of annual earnings, and the distribution of lifetime earnings. This paper proposes to implement closer monitoring of lifetime earnings and take a proactive stance in the formation of the wage-bargaining regime.

关键词： earnings inequality labor market institutions Germ

A High-Order Conservative Semi-Lagrangian Solver for 3D Free Surface Flows with Sediment Transport on Voronoi Meshes

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Communications on Applied Mathematics and Computation 2023年第2期5卷 596-637页

作者： Matteo Bergami Walter Boscheri giacomo Dimarco Department of Mathematics and Computer Science University of FerraraVia Machiavelli 30I-44121 FerraraItaly

In this paper,we present a conservative semi-Lagrangian scheme designed for the numeri-cal solution of 3D hydrostatic free surface flows involving sediment transport on unstruc-tured Voronoi meshes.A high-order reconstruction procedure is employed for obtaining a piecewise polynomial representation of the velocity field and sediment concentration within each control *** is subsequently exploited for the numerical integration of the Lagrangian trajectories needed for the discretization of the nonlinear convective and viscous *** presented method is fully conservative by construction,since the transported quantity or the vector field is integrated for each cell over the deformed vol-ume obtained at the foot of the characteristics that arises from all the vertexes defining the computational *** semi-Lagrangian approach allows the numerical scheme to be unconditionally stable for what concerns the advection part of the governing ***,a semi-implicit discretization permits to relax the time step restriction due to the acoustic impedance,hence yielding a stability condition which depends only on the explicit discretization of the viscous terms.A decoupled approach is then employed for the hydrostatic fluid solver and the transport of suspended sediment,which is assumed to be *** accuracy and the robustness of the resulting conservative semi-Lagrangian scheme are assessed through a suite of test cases and compared against the analytical solu-tion whenever is *** new numerical scheme can reach up to fourth order of accu-racy on general orthogonal meshes composed by Voronoi polygons.

关键词： Conservative semi-Lagrangian Free surface flows Sediment transport High-order reconstruction Hydrostatic model

Using coloured roots to study root interaction and competition in intercropped legumes and non-legumes

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Journal of Plant Ecology 2010年第3期3卷 191-199页

作者： giacomo Tosti Kristian Thorup-Kristensen Department of Agriculture and Environmental Sciences University of PerugiaBorgo XX Giugno 7406121 PerugiaItaly Department of Agriculture and Ecology Faculty of Life SciencesUniversity of CopenhagenHøjbakkegaards Alle 13DK-2630 TaastrupDenmark

Aims Root interactions between neighbour plants represent a fundamental aspect of the competitive dynamics in pure stand and mixed cropping *** comprehension of such phenomena places big methodological challenges,and still needs *** objectives of this work were(i)to test if a species with coloured roots can be used to examine the interaction in a legume-non-legume intercropping system;(ii)to verify the importance of initial root growth on the successive root development ofmixture component plants;(iii)to test if the root interaction in the shallowlayers has consequences for deep root growth and(iv)to compare the effect of intraspecific and interspecific competition on root development and biomass *** A detailed study on root growth and interaction was carried out using rhizotron tubes where two legume species were grown in pure stands or were intercropped with red beet,a variety of Beta vulgaris *** clear red *** the rhizotrons,the three species were grown either without competitors,with two plants of the same species to measure intraspecific competition or with one legume and one red beet plant to study interspecific *** use of mixtures where one component has clearly coloured roots,together with several scalar measurements of root depth and proliferation,allowed the measurement of the root system of each species when grown in the *** findings The use of rhizotron tubes coupled with species with coloured roots represented a valuable method to study the belowground interaction in mixed cropping *** initial root growth was a very important feature for the subsequent dominance of a species and it was not related to seed *** root growth was also important because the root interactions in the shallower soil layers were found to influence the root growth in deeper *** root system of the red beet showed much faster and deeper growth than that of the legumes,and made red beet

关键词： red beet root competition root interaction root proliferation rhizotron

Simplified prediction models for acoustic installation effects of train-mounted equipment

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Railway Engineering Science 2024年第2期32卷 125-143页

作者： David Thompson Dong Zhao giacomo Squicciarini Institute of Sound and Vibration Research University of SouthamptonSouthampton SO171BJUK

Acoustic models of railway vehicles in standstill and pass-by conditions can be used as part of a virtual certification process for new *** each piece of auxiliary equipment,the sound power measured on a test bench is combined with meas-ured or predicted transfer *** is important,however,to allow for installation effects due to shielding by fairings or the train *** the current work,fast-running analytical models are developed to determine these installation *** model for roof-mounted sources takes account of diffraction at the corner of the train body or fairing,using a barrier *** equipment mounted under the train,the acoustic propagation from the sides of the source is based on free-field Green’s *** bottom surfaces are assumed to radiate initially into a cavity under the train,which is modelled with a simple diffuse field *** sound emitted from the gaps at the side of the cavity is then assumed to propagate to the receivers according to free-field Green’s *** show good agreement with a 2.5D boundary element model and with *** uncertainty and parametric uncertainty are *** largest variability occurs due to the height and impedance of the ground,especially for a low *** leads to standard deviations of up to 4 dB at low *** the roof-mounted sources,uncertainty over the location of the corner used in the equivalent barrier model can also lead to large standard deviations.

关键词： Train noise Auxiliary equipment Acoustic installation effects Virtual certification Uncertainty

Emerging Role of the Ubiquitin Proteasome System in the Control of Shoot Apical Meristem Function

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Journal of Integrative Plant Biology 2013年第1期55卷 7-20页

作者： Elisabetta Di giacomo Giovanna Serino Giovanna Frugis Istituto di Biologia e Biotecnologia Agraria UOS RomaConsiglio Nazionale delle RicercheMonterotondo Scalo Dipartimento di Biologia e Biotecnologie Charles Darwin Sapienza Università The New York Botanical Garden Genomics Program NYBGBronx

The shoot apical meristem （SAM） is a population of undifferentiated cells at the tip of the shoot axis that establishes early during plant embryogenesis and gives rise to all shoot organs throughout the plant＇s life. A plethora of different families of transcription factors （TFs） play a key role in establishing the equilibrium between cell differentiation and stem cell maintenance in the SAM. Fine tuning of these regulatory proteins is crucial for a proper and fast SAM response to environmental and hormonal cues, and for development progression. One effective way to rapidly inactivate TFs involves regulated proteolysis by the ubiquitin/26S proteasome system （UPS）. However, a possible role of UPS-dependent protein degradation in the regulation of key SAM TFs has not been thoroughly investigated. Here, we summarize recent evidence supporting a role for the UPS in SAM maintenance and function. We integrate this survey with an in silico analysis of publicly-available microarray databases which identified ubiquitin ligases that are expressed in specific areas within the SAM, suggesting that they may regulate or act downstream of meristem-specific factors.

关键词： Arabidopsis thaliana cell differentiation protein degradation shoot apical meristem ubiquitin/26S proteasome system.

Intraocular lens power calculation in eyes with previous corneal refractive surgery

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Eye and Vision 2018年第1期5卷 172-181页

作者： giacomo Savini Kenneth J.Hoffer G.B.Bietti Eye Foundation RomeItaly. Stein Eye Institute University of CaliforniaLos AngelesCAUSA.3 St.Mary’s Eye CenterSanta MonicaCAUSA

Background:This review aims to explain the reasons why intraocular lens(IOL)power calculation is challenging in eyes with previous corneal refractive surgery and what solutions are currently available to obtain more accurate ***:After IOL implantation in eyes with previous LASIK,PRK or RK,a refractive surprise can occur because (i)the altered ratio between the anterior and posterior corneal surface makes the keratometric index invalid;(ii)the corneal curvature radius is measured out of the optical zone;and (iii)the effective lens position is erroneously predicted if such a prediction is based on the post-refractive surgery corneal *** methods are currently available to obtain the best refractive outcomes in these eyes,even when the perioperative data(*** corneal power and surgically induced refractive change)are not *** this review,we describe the most accurate methods based on our clinical ***:IOL power calculation after myopic corneal refractive surgery can be calculated with a variety of methods that lead to relatively accurate outcomes,with 60 to 70%of eyes showing a prediction error within 0.50 diopters.

关键词： Cataract Intraocular lens power LASIK PRK Excimer laser Corneal surgery Keratometry

SIRENE: A Spatial Data Infrastructure to Enhance Communities' Resilience to Disaster-Related Emergency

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International Journal of Disaster Risk Science 2018年第1期9卷 129-142页

作者： Simone Sterlacchini Gloria Bordogna giacomo Cappellini Debora Voltolina Institute for the Dynamics of Environmental Processes –National Research Council of Italy (CNR-IDPA) Institute for Electromagnetic Sensing of the Environment –National Research Council of Italy (CNR-IREA)

Planning in advance to prepare for and respond to a natural hazard-induced disaster-related emergency is a key action that allows decision makers to mitigate unexpected impacts and potential damage. To further this aim, a collaborative, modular, and information and communications technology-based Spatial Data Infrastructure(SDI)called SIRENE—Sistema Informativo per la Preparazione e la Risposta alle Emergenze(Information System for Emergency Preparedness and Response) is designed and implemented to access and share, over the Internet, relevant multisource and distributed geospatial data to support decision makers in reducing disaster risks. SIRENE flexibly searches and retrieves strategic information from local and/or remote repositories to cope with different emergency phases. The system collects, queries, and analyzes geographic information provided voluntarily by observers directly in the field(volunteered geographic information(VGI) reports) to identify potentially critical environmental conditions. SIRENE can visualize and cross-validate institutional and research-based data against VGI reports,as well as provide disaster managers with a decision support system able to suggest the mode and timing of intervention, before and in the aftermath of different types of emergencies, on the basis of the available information and in agreement with the laws in force at the national andregional levels. Testing installations of SIRENE have been deployed in 18 hilly or mountain municipalities(12 located in the Italian Central Alps of northern Italy, and six in the Umbria region of central Italy), which have been affected by natural hazard-induced disasters over the past years(landslides, debris flows, floods, and wildfire) and experienced significant social and economic losses.

关键词： Data retrieval Decision support system Disaster management Italy Spatial data infrastructure Susceptibility/hazard and risk maps Volunteered geographic information

Implicit-Explicit Runge-Kutta Schemes for the Boltzmann-Poisson System for Semiconductors

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Communications in Computational Physics 2014年第5期15卷 1291-1319页

作者： giacomo Dimarco Lorenzo Pareschi Vittorio Rispoli Universite de Toulouse UPSINSAUT1UTMCNRSUMR 5219Institut de Mathematiques de ToulouseF-31062 ToulouseFrance Department of Mathematics and Computer Science University of Ferraravia Machiavelli 3544121 FerraraItaly.

In this paper we develop a class of Implicit-Explicit Runge-Kutta schemes for solving the multi-scale semiconductor Boltzmann *** relevant scale which characterizes this kind of problems is the diffusive *** means that,in the limit of zero mean free path,the system is governed by a drift-diffusion *** aim is to develop a method which accurately works for the different regimes encountered in general semiconductor simulations:the kinetic,the intermediate and the diffusive ***,we want to overcome the restrictive time step conditions of standard time integration techniques when applied to the solution of this kind of phenomena without any deterioration in the *** a result,we obtain high order time and space discretization schemes which do not suffer from the usual parabolic stiffness in the diffusive *** show different numerical results which permit to appreciate the performances of the proposed schemes.

关键词： IMEX-RK methods asymptotic preserving methods semiconductor Boltzmann equation drift-diffusion limit