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Hybrid Short-term Load Forecasting Method Based on Empirical Wavelet Transform and Bidirectional Long Short-term Memory Neural Networks

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Journal of Modern Power Systems and Clean Energy 2022年第5期10卷 1216-1228页

作者： Xiaoyu Zhang Stefanie Kuenzel Nicolo colombo Chris Watkins School of Artificial Intelligence Anhui UniversityHefei 230601China Department of Electronic Engineering Royal HollowayUniversity of LondonEgham HillEgham TW20 OEXUK Department of Computer Science Royal HollowayUniversity of LondonEgham HillEgham TW200EXUK

Accurate short-term load forecasting is essential to modern power systems and smart grids. The utility can better implement demand-side management and operate power system stably with a reliable load forecasting system. The load demand contains a variety of different load components, and different loads operate with different frequencies. The conventional load forecasting methods, e.g., linear regression(LR), auto-regressive integrated moving average(ARIMA), deep neural network, ignore the frequency domain and can only use time-domain load demand as inputs. To make full use of both time-domain and frequency-domain features of the load demand, a load forecasting method based on hybrid empirical wavelet transform(EWT) and deep neural network is proposed in this paper. The proposed method first filters noises via wavelet-based denoising technique, and then decomposes the original load demand into several sub-layers to show the frequency features while the time-domain information is preserved as well. Then, a bidirectional long short-term memory(LSTM) method is trained for each sub-layer independently. In order to better tune the hyperparameters, a Bayesian hyperparameter optimization(BHO) algorithm is adopted in this paper. Three case studies are designed to evaluate the performance of the proposed *** the results, it is found that the proposed method improves the prediction accuracy compared with other load forecasting method.

关键词： Load forecasting empirical wavelet transform(EWT) recurrent neural network data denoising Bayesian hyperparameter optimization(BHO)

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Two methodological approaches to assess the seismic vulnerability of masonry bridges

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Journal of Traffic and Transportation Engineering(English Edition) 2019年第1期6卷 49-64页

作者： diego Maria Barbieri Department of Civil and Environmental Engineering Norwegian University of Science and Technology Department of Civil Constructional and Environmental Engineering Sapienza University of Rome

This work describes the seismic vulnerability assessment of a railway masonry arch *** conservation state is initially investigated by means of a thorough field and laboratory test campaign, comprising destructive and non-destructive tests. Two different methods are used to evaluate the bridge seismic vulnerability. The first method adopts a deterministic approach and corresponds to a single non-linear static analysis, performed as described in the Eurocodes. The second method employs a probabilistic approach and considers the variability of the involved mechanical parameters(structure geometry and properties of the building materials) and seismic parameters(intensity of the action and site conditions). This method associates the probabilistic values of ground acceleration exceedance to the estimated seismic vulnerability. This is shown by means of fragility curves, which allow to take into consideration the uncertainty of the various components involved in the definition of the seismic vulnerability and display the seismic damage scenarios. Currently no code requires to perform this calculation procedure. In addition,this work compares the values of masonry mechanical properties specified in the Eurocodes with those obtained in an extensive investigation campaign involving more than one hundred masonry bridges. Compressive strength and longitudinal elasticity modulus are the relevant mechanical parameters investigated. The outcomes of this research can contribute to the development of a more efficient maintenance system of the masonry bridges belonging to the railway network. This has an important role when it comes to establishing the priority order of assets intervention.

关键词： Railway masonry arch bridge Bridge maintenance and conservation Masonry mechanical parameters Non-linear static analysis Seismic fragility Finite element analysis

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RIGOROUS ESTIMATES ON BALANCE LAWS IN BOUNDED DOMAINS

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Acta Mathematica Scientia 2015年第4期35卷 906-944页

作者： Rinaldo M.colombo Elena ROSSI Unità INdA M Università di Brescia Dipartimento di Matematica ed Applicazioni Università di Milano-Bicocca

The initial-boundary value problem for a general balance law in a bounded domain is proved to be well posed. Indeed, we show the existence of an entropy solution, its uniqueness and its Lipschitz continuity as a function of time, of the initial datum and of the boundary datum. The proof follows the general lines in [4], striving to provide a rigorous treatment and detailed references.

关键词： balance laws initial-boundary value problem for balance laws

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Current status of first-line therapy,anti-angiogenic therapy and its combinations of other agents for unresectable hepatocellular carcinoma

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World Journal of Gastrointestinal Oncology 2021年第12期13卷 2038-2049页

作者： Saleh A Alqahtani Massimo G colombo Division of Gastroenterology and Hepatology Johns Hopkins UniversityBaltimoreMD 21287United States Liver Transplant Center and BiostatisticsEpidemiologyand Scientific Computing DepartmentKing Faisal Specialist Hospital&Research CenterRiyadh 11564Saudi Arabia Liver Center IRCCS San Raffaele HospitalMilan 20132Italy

Globally,hepatocellular carcinoma(HCC)is a frequently diagnosed malignancy with rapidly increasing incidence and mortality ***,many of these patients are diagnosed in the advanced stages when locoregional treatments are not *** 2008,no effective drug treatments existed to prolong survival,until the breakthrough multi-tyrosine kinase inhibitor(TKI)sorafenib was *** remained the standard treatment option for advanced HCC for 10 years,with a battery of other candidate drugs in clinical trials failing to produce similar efficacy *** 2018,the REFLECT trial introduced another multi-TKI,lenvatinib,which has non-inferior overall survival compared with ***,offering patients and their treating physicians two effective treatment ***,immunotherapy-based drugs,such as atezolizumab and bevacizumab,have shown promising results in patients with unresectable *** review summarizes clinical trial and real-world data studies of sorafenib and lenvatinib in patients with unresectable *** offer guidance on the optimal choice between the two treatments and discuss the potential of immunotherapy-based combination;when more data become available,this will likely make the choice between sorafenib and lenvatinib somewhat obsolete.

关键词： Hepatocellular carcinoma Immune checkpoint inhibitor Lenvatinib Multityrosine kinase inhibitor Sorafenib

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Orbit orientation in didelphid marsupials （Didelphimorphia： Didelphidae）

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Current Zoology 2017年第4期63卷 403-415页

作者： Patricia PILATTI diego ASTUA Laboratorio de Mastozoologia Departamento de Zoologia Universidade Federal de Pernambuco. Av. Prof. Moraes Rego S/N Cidade Universitaria Recife PE 50670-901 Brazil

Usually considered a morphologically conservative group, didelphid marsupials present consider- able variation in ecology and body size, some of which were shown to relate to morphological structures. Thus, changes on orbit morphology are likely and could be related to that variation. We calculated orbit orientation in 873 specimens of 16 Didelphidae genera yielding estimates of orbits convergence （their position relative to midsagittal line） and verticality （their position relative to frontal plane）. We then compared similarities in these variables across taxa to ecological, morpho- logical and phylogenetic data to evaluate the influencing factors on orbit orientation in didelphids. We found an inverse relation between convergence and verticality. Didelphids orbits have low ver- ticality but are highly convergent, yet orbit orientation differs significantly between taxa, and that variation is related to morphological aspects of the cranium. Rostral variables are the only morpho- logical features correlated with orbit orientation： increasing snout length yields more convergent orbits, whereas increase on snout breadth imply in more vertical orbits. Size and encephalization quotients are uncorrelated with orbit orientation. Among ecological data, diet showed significant correlation whereas locomotion is the factor that less affects the position of orbits. Phylogeny is uncorrelated to any orbital parameters measured. Ecological factors seemingly play a more import- ant role on orbit orientation than previously expected, and differentiation on orbit orientation seems to be more functional than inherited. Thus, despite the apparent homogeneity on didelphid morphology, there is subtle morphological variability that may be directly related to feeding behavior.

关键词： convergence Didelphidae frontation orbit orientation verticality.

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An Integrated Approach for Optimal Design of Micro Gas Turbine Combustors

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Journal of Thermal Science 2009年第2期18卷 173-184页

作者： Luca Fuligno diego Micheli Carlo Poloni EnginSoft s.p.a. Dipartimento di Ingegneria Meccanica Universita degli Studi di Trieste Dipartimento

The present work presents an approach for the optimized design of small gas turbine combustors, that integrates a0-D code, CFD analyses and an advanced game theory multi-objective optimization algorithm. The output of the0-D code is a baseline design of the combustor, given the required fuel characteristics, the basic geometry (tubularor annular) and the combustion concept (i.e. lean premixed primary zone or diffusive processes). For the optimizationof the baseline design a simplified parametric CAD/mesher model is then defined and submitted to a CFDcode. Free parameters of the optimization process are position and size of the liner hole arrays, their total area andthe shape of the exit duct, while different objectives are the minimization of NOx emissions, pressure losses andcombustor exit Pattern Factor. A 3D simulation of the optimized geometry completes the design procedure. As afirst demonstrative example, the integrated design process was applied to a tubular combustion chamber with alean premixed primary zone for a recuperative methane-fuelled small gas turbine of the 100 kW class.

关键词： micro gas turbine combustor optimized design

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Correlation of powder flow properties to interparticle interactions at ambient and high temperatures

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Particuology 2014年第1期12卷 90-99页

作者： Igino Tomasetta diego Barletta Massimo Poletto Dipartimento di Ingegneria Industriale Università degli Studi di Salerno

A combination of a continuum approach and a particleparticle approach to describe the multiscale nature of the mechanical properties of bulk solids may be beneficial to scientific and engineering applica tions. In this paper, a procedure is proposed to estimate the interparticle forces beginning with the bulk flow properties as measured with standardized techniques. In particular, the relationship between inter particle forces and bulk solid tensile strength is adopted based on the microscale approaches of Rumpf （1970） and Molerus （1975）. The flow properties of fluid cracking catalyst （FCC）, corundum and glass bead powders were all characterized with a modified Schulze ring shear cell capable of operating at tempera tures up to 500 ~C. The powder test conditions were selected such that the van der Waals forces were the most significant particleparticle interactions. The model equations describe two cases, in which either elastic or plastic deformation of the contact points is assumed. The results indicate that the model pro vides the correct order of magnitude for the values of the tensile strength when proper values for the mean curvature radius at the contact points are taken into account. A sensitivity analysis for the main parameters in the model was performed. This analysis indicated that the assumption of plastic deforma tion at contact surfaces coupled with a decrease in porosity justified an increase of the tensile strength with consolidation stress. Furthermore, the effect of temperature on the measured flow behavior can be explained as a change in the strength of the material.

关键词： Shear testingYield locusvan der Waals forcelnterparticle interactionsPowder consolidationHigh temperature

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A comparison between powder flow property testers

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Particuology 2017年第3期15卷 10-20页

作者： Hamid Salehi diego Barletta Massimo Poletto Dipartimento di lngegneria lndustriale Universita degli Studi di Salerno Via Giovanni Paolo II 132 84084 Fisciano SA Italy

In this work, three different shear testers-the Jenike shear cell tester, the Schulze ring shear tester, and the Brookfield powder flow tester-were compared in terms of the raw shear stress time series, yield loci points, angle of internal friction, cohesion, and unconfined yield strength. The three different powders of dolomitic lime, calcium lactate, and calcium carbonate were used for these comparisons. These three powders were characterized into different flowability classes using the ]enike classification, wherein dolomitic lime falls into the cohesive range, calcium lactate falls into the free-flowing range, and calcium carbonate falls into the very cohesive range. Results showed that the best agreement between the testers was found with moderately cohesive powders such as dolomitic lime. Furthermore, the free-flowing material tends to produce more consistent data between the three testers in terms of shear stresses and yield loci. It should be noted that the pre-shear data of free-flowing powder obtained by the Jenike shear cell must be appropriately interpreted. The largest differences between the testers are found with calcium carbonate, which is a highly compressible powder. The ways in which a high powder compressibility can differently affect the results obtained with the different testers were discussed.

关键词： Powder flow property Shear tester Flowability Jenike tester Schulze tester Brookfield powder flow tester

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Enhanced sampling for lipid-protein interactions during membrane dynamics

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BIOCELL 2023年第1期47卷 1-14页

作者： diego MASONE Instituto de Histología y Embriología de Mendoza(IHEM)-Consejo Nacional de Investigaciones Científicas y Técnicas(CONICET) Universidad Nacional de Cuyo(UNCuyo)Mendoza5500Argentina Facultad de Ingeniería Universidad Nacional de Cuyo(UNCuyo)Mendoza5500Argentina

The inflexible concept of membrane curvature as an independent property of lipid structures is today *** bilayers behave as many-body entities with emergent properties that depend on their interactions with the *** particular,proteins exert crucial actions on lipid molecules that ultimately condition the collective properties of the *** this review,the potential of enhanced molecular dynamics to address cell-biology problems is *** cases of membrane deformation,membrane fusion,and the fusion pore are analyzed from the perspective of the dimensionality reduction by collective *** lipid-protein interactions as fundamental determinants of large membrane remodeling events are also ***,novel strategies merging cell biology and physics are considered as future lines of research.

关键词： Membrane bending Membrane fusion Fusion stalk Hemifusion diaphragm Fusion pore Molecular dynamics Collective variables Collective behavior Emergent properties

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Chinese Annals of Mathematics,Series B 2009年第5期30卷 505-512页

作者： Angel CASTRO diego CóRDOBA Instituto de Ciencias Matemticas CSIC-UAM-UC3M-UCMConsejo Superior de Investigaciones Científicas

The authors construct self-similar solutions for an N-dimensional transport equation,where the velocity is given by the Riezs *** solutions imply nonuniqueness of weak *** addition,self-similar solution for a one-dime... 详细信息

关键词： Hilbert transform Riesz transform Transport equations Self-similar solutions

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