检索结果-南通市图书馆

epidemicity indices and reproduction numbers from infectious disease data in connected human populations

在线全文

学校读者我要写书评

暂无评论

Infectious disease Modelling 2024年第3期9卷 875-891页

作者： Cristiano Trevisin Lorenzo Mari Marino Gatto Andrea Rinaldo Laboratory of ecohydrology École Polytechnique Fédérale de LausanneStation 2Lausanne1015Switzerland dipartimento di elettronica Informazione e BioingegneriaPolitecnico di MilanoVia Ponzio 34/5Milano20133Italy dipartimento di Ingegneria Civile Edile e Ambientale(ICEA)Universitàdi PadovaStation 2Padova35131Italy

We focus on distinctive data-driven measures of the fate of ongoing *** relevance of our pursuit is suggested by recent results proving that the short-term temporal evolution of infection spread is described by an epidemicity index related to the maximum instantaneous growth rate of new infections,echoing concepts and tools developed to study the reactivity of *** epidemicity indices can showcase the dynamics of infections,together with commonly employed effective reproduction numbers,especially when the latter assume values less than *** particular,epidemicity evaluates the short-term reactivity to perturbations of a disease-free ***,we show that sufficient epidemicity thresholds to prevent transient epidemic outbreaks in a spatially connected setting can be estimated by generalizing existing analogues derived when spatial effects are *** specifically account for the discrete nature,in both space and time,of surveillance data of the type typically employed to estimate effective reproduction numbers that formed the bulk of the communication of the state of the COVID-19 pandemic and its *** analyzing the effects of spatial heterogeneity on the considered prognostic indicators,we perform a short-and long-term analysis on the COVID-19 pandemic in Italy,showing that endemic conditions were maintained throughout the duration of our simulation despite stringent control *** method provides a portfolio of prognostic indices that are essential to pinpoint the ongoing pandemic in both a qualitative and quantitative manner,as our results *** base our conclusions on extended investigations of the effects of spatial fragmentation of communities of different sizes owing to connectivity by human mobility and contact scenarios,within real geographic contexts and synthetic setups designed to test our framework.

关键词： COVID-19 ecological reactivity epidemicity Reproduction numbersLeslie matrix Metapopulation Mobility

Repeat-pass space-surface bistatic SAR tomography:accurate imaging and first experiment

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2024年第9期67卷 245-262页

作者： Zhiyang CHeN Yuanhao LI Cheng HU Shenglei WANG Xinpeng CHeN Mihai DATCU Andrea Virgilio MONTI-GUARNIeRI Radar Technology Research Institute School of Information and Electronics Beijing Institute of Technology Beijing Key Laboratory of embedded Real-Time Information Processing Technology Beijing Institute of Technology Advanced Technology Research Institute Beijing Institute of Technology CeOSpace Tech University Politehnica of Bucharest dipartimento di elettronica Informazione e Bioingegneria Politecnico di Milano

Space-surface bistatic synthetic aperture radar(SS-BiSAR) offers an additional observation angle for monostatic spaceborne SAR, making it a promising technology for high-accuracy deformation retrieval technology in local regions. Repeat-pass SS-BiSAR tomography can accurately estimate the surfaces of buildings and steep areas, effectively removing terrain phases during deformation retrieving. However, inaccuracies in the orbital ephemeris can lead to image geometry distortion, reducing image pair coherence,introducing interferometric phase errors, and consequently deteriorating tomographic precision. This paper precisely models the image geometry distortion and interferometric phase error caused by repeat-pass ephemeris error. We propose an ephemeris correction method based on the chirp-Z transform to address these issues. Furthermore, we introduce an accurate tomography model to improve 3D reconstruction *** first SS-BiSAR tomography experiment, conducted using the Chinese Lutan-1 satellite, demonstrates that the correlation coefficient is improved by 0.16 after ephemeris error correction. Moreover, the density and precision of the tomographic point cloud are improved by 13.7% and 12.1%, respectively.

关键词： space-surface SAR tomography orbit error image distortion Lutan-1

ARBITRARILY HIGH-ORDeR eNeRGY-CONSeRVING MeTHODS FOR HAMILTONIAN PROBLeMS WITH QUADRATIC HOLONOMIC CONSTRAINTS

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Computational Mathematics 2024年第4期42卷 1145-1171页

作者： Pierluigi Amodio Luigi Brugnano Gianluca Frasca-Caccia Felice Iavernaro dipartimento di Matematica Università di BariItaly dipartimento di Matematica e Informatica"U.dini" Università di FirenzeItaly dipartimento di Matematica Università di SalernoItaly

In this paper,we define arbitrarily high-order energy-conserving methods for Hamilto-nian systems with quadratic holonomic *** derivation of the methods is made within the so-called line integral *** tests to illustra... 详细信息

关键词： Constrained Hamiltonian systems Quadratic holonomic constraints energy-conserving methods Line integral methods Hamiltonian Boundary Value Methods HB-VMs

Voltage controlled iontronic switches:a computational method to predict electrowetting in hydrophobically gated nanopores

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Smart and Nano Materials 2024年第1期15卷 165-185页

作者： Goncalo Paulo Alberto Gubbiotti Giovanni di Muccio Alberto Giacomello dipartimento di Ingegneria Meccanica e Aerospaziale Sapienza Universita di RomaRomeItaly

Reliable and controllable switches are crucial in nanofluidics and *** channels found in nature serve as a rich source of inspiration due to their intricate mechanisms modulated by stimuli like pressure,temperature,chemical species,and *** artifi-cial replication of the properties of these channels is challenging due to their complex chemistry,limited stability range,and intricate moving parts,allosterically ***,we can harness some of the gating mechanisms of ion channels for nanofluidic and iontronic *** theoretical and computational study explores the use of electrowetting in simple hydrophobic nanopores to control their conductance using an external applied *** employ restrained molecular dynamics to calculate the free energy required for wetting a model nanopore under different *** a simple theory,we generate free energy profles across a wide voltage *** also computed transition rates between conductive and non-conductive states,showing their voltage depen-dence and how this behavior can impair memory to the system,resembling the memristor behavior voltage-gated channels in the *** proposed framework provides a promising avenue for designing and controlling hydrophobic nanopores via electrowet-ting,enabling potential applications in neuromorphic iontronics.

关键词： electrowetting lontronics hydrophobic gating

Interpreting siliciclastic sedimentation in the upper Paleozoic Mulargia-escalaplano Basin(Sardinia, Italy):influence of tectonics on provenance

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Palaeogeography 2024年第1期13卷 18-34页

作者： Luca G.Costamagna Sara Criniti dipartimento di Scienze Chimiche e Geologiche Citadella UniversitariaBlocco A09042 Monserrato CAItaly dipartimento di Ingegneria dell'Ambiente Universita della Calabria87036 Arcavacata di Rende CSItaly

Late to post-Variscan molassic basins of Late Pennsylvanian-Permian age are exposed in Sardinia(Italy). Here, the compositional and stratigraphic evolution of the Mulargia-escalaplano sedimentary basin(central Sardinia) has been investigated to highlight how the tectono-magmatic processes have influenced the sedimentation. Ruditic and arenitic samples were collected along well-characterized stratigraphic sections to provide a new insight into the impact of the tectono-magmatic processes on siliciclastic sedimentation. As a result, the conglomerates are mainly clast-supported, petromictic, and thus immature, with no defined maturity trend upwards. Nevertheless, pebble composition changes in times from Variscan basement pebble-rich to volcanic rock-rich, as a consequence of the basin widening and the dismantling and reworking of the coeval volcanic activity. The sandstone composition clearly changes from quartzolithic to feldspatholithic upwards, as a response to the same change of feeding and reworking of the volcanic rocks. Occasionally, interbedded quartzolithic arenites suggest exceptional floods carrying debris from the far borders of the basin. Also, the immature sandstone composition has been interpreted as being controlled by a continuous supply of fresh debris and to a rapid burial rate. In addition, the disappearance of metaradiolarite(lydite AA) Paleozoic grains in the sandstone mineral suite could represent a distinctive marker of a progressive unroofing of the Variscan chain and a clastic supply from deeper tectonic units.

关键词： Petrography Stratigraphy Provenance Molassic basins Sardinia

Statistical analysis of physico-mechanical parameters of sandstones occurring in orogenic settings

在线全文

学校读者我要写书评

暂无评论

Journal of Mountain Science 2024年第4期21卷 1388-1402页

作者： PAPPALARDO Giovanna CARBONe Serafina MONACO Carmelo ZOCCO Giordana MINeO Simone dipartimento di Scienze Biologiche Geologiche E AmbientaliUniversitàDegli Studi Di CataniaCorso Italia 5795129 CataniaItaly

In northeastern Sicily(Italy),sandstone rock masses widely crop out as cover deposits over crystalline terrains belonging to the orogenic *** being part of the same geological formation,these sandstones are characterized by highly different features in terms of texture and physico-mechanical *** poses a scientific question on the possibility of tracing these rocks to a single statistical model,which could be representative of their main engineering geological ***,it is worth investigating on the possible reasons of such differences,that should be searched either in the current geographical sandstone distribution or in the rock *** this study,sandstone samples were collected from different sites and were analyzed at both the hand and thin section *** sandstone types were recognized,characterized by a different ***,the laboratory characterization allowed estimating their main physico-mechanical and ultrasonic properties,such as porosity,density,mechanical strength,deformability,and ultrasonic *** rock mechanical strength proved linked to the rock compactness and to the presence of lithic fragments,while pores and a pseudo-matrix between grains represent weakening *** data were also statistically analyzed by grouping the specimens according to a geographical criterion,with respect to their sampling area,but no link was found between location and rock ***,with the aim of achieving mathematical laws that could be used to predict some rock properties from others,useful for practical purposes when dealing with such a high property variability,single and multiple regression analyses were carried *** show that the Uniaxial Compressive Strength,porosity,and P-wave velocity are the best predictors for a quick,indirect estimation of the main physico-mechanical *** methodological approach developed for this research can be taken as reference to study other world

关键词： Sandstone Laboratory test Uniaxial Compressive Strength Porosity Rocks

MIS 5e sea surface temperature estimation;a multi-proxy approach using a marine macrofossil assemblage(Mar Piccolo,Gulf of Taranto,Southern Italy)

在线全文

学校读者我要写书评

暂无评论

Journal of Palaeogeography 2024年第2期13卷 327-350页

作者： Pierluigi Santagati edoardo Perri Maria Pia Bernasconi Mario Borrelli Salvatore Guerrieri Salvatore Critelli dipartimento di Biologia Ecologia e Scienze della TerraUniversita della Calabriavia Pietro Bucci87036 Arcavacata di RendeCosenzaItaly dipartimento di Ingegneria Ambientale Universita della Calabriavia Pietro Bucci87036 Arcavacata di RendeCosenzaItaly

It is reported a multi-proxy palaeoclimatic study conducted on a MIS 5e calcarenite from the Mar Piccolo Basin(MP),Gulf of Taranto(GT)(Central Mediterranean).The calcarenite returned a rich malacofauna consisting of 120 extant species,including four of the tropical Senegalese Fauna,today absent in the *** biogeographic-climatic affinity of the assemblage shows,compared to today,a double percentage of warm affinity species,while the cold affinity species are nearly equally represented,indicating a warmer but not strictly tropical *** is confirmed by the most recurring preferred SST ranges of the assemblage,indicating an average of 20℃.The skeletal compositions of five well-preserved molluscan and coral specimens were analyzed for trace elements and stable isotopes for further mean SST *** the comparison of the results of several equations available in literature,it appears that only some SST estimations are realistic,converging into similar values of,on average,20.8±0.9℃.Considering all the used proxies,the MIS 5e SST difference compared to today falls in the range 1.2—2.0℃for the GT(being a more reasonable scenario)and 2.0—2.8℃for the *** is not a firmly tropical-like SST setting as suggested by the sole Senegalese fauna,indicating at least 2.7℃—3.5℃more than today’s GT and MP,*** approximations and assumptions made for obtaining SST values with any single proxy indicate the need of a multi-proxy approach to define the best SST estimation.

关键词： MiS 5e Sea surface temperature Palaeoclimate proxy Fossil fauna Gulf of Taranto

Toward scalable docker-based emulations of blockchain networks for research and development

在线全文

学校读者我要写书评

暂无评论

Blockchain(Research and Applications) 2024年第3期5卷 168-183页

作者： diego Pennino Maurizio Pizzonia Universitàdegli Studi della Tuscia Dipartimento di EconomiaIngegneriaSocietàe Impresa01100 ViterboItaly Universitàdegli Studi Roma Tre Dipartimento di Ingegneria CivileInformatica e delle Tecnologie Aeronautiche00146 RomeItaly

Blockchain,like any other complex technology,needs a strong testing methodology to support its evolution in both research and development *** up meaningful tests for permissionless blockchain technology is a notoriously complex task for several reasons:software is complex,a large number of nodes are involved,the network is non-ideal,*** usually adopt small virtual laboratories or costly real devnets based on real *** usually prefer simulations of a large number of nodes based on simplified *** this paper,we aim to obtain the advantages of both approaches,i.e.,performing large,realistic,inexpensive,and flexible experiments,using real blockchain software within a virtual *** do that,we address the challenge of running large blockchain networks in a single physical machine,leveraging Linux and *** analyze a number of problems that arise when large blockchain networks are emulated,and we provide technical solutions for all of ***,we describe two experiences of emulating fairly large blockchain networks on a single machine:adopting both research-oriented and production-oriented software and involving more than 3000 containers.

关键词： Blockchain Blockchain emulation Scalability Docker Research and development experiments

Investigations on MoS_(2)plasma by infra-red pulsed laser irradiation in high vacuum

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Plasma Science and Technology 2024年第7期26卷 123-133页

作者： Lorenzo TORRISI Letteria SILIPIGNI Alfio TORRISI Mariapompea CUTRONeO dipartimento di Scienze Matematiche e Informatiche Scienze Fisiche e Scienze della TerraMIFTUniversitàdi MessinaMessina 98166Italy Faculty of Medicine and Surgery Kore University of EnnaEnna 94100Italy Nuclear Physics Institute of the CAS HusinecŘežPrague 25068Czech Republic

MoS_(2)targets were irradiated by infra-red(IR)pulsed laser in a high vacuum to determine hot plasma parameters,atomic,molecular and ion emission,and angular and charge state *** this way,pulsed laser deposition(PLD)of thin films on graphene oxide substrates was also *** Nd:YAG laser,operating at the 1064 nm wavelength with a 5 ns pulse duration and up to a 1 J pulse energy,in a single pulse or at a 10 Hz repetition rate,was *** yield was measured as a function of the laser *** was characterized using different analysis techniques,such as time-of-flight measurements,quadrupole mass spectrometry and fast CCD visible *** so-produced films were characterized by composition,thickness,roughness,wetting ability,and *** compared to the MoS_(2)targets,they show a slight decrease of S with respect to Mo,due to higher ablation yield,low fusion temperature and high sublimation in *** pulsed IR laser deposited Mo Sx(with 1e uniform,with a thickness of about 130 nm,a roughness of about 50 nm and a higher wettability than the MoS_(2)*** potential applications of the pulsed IR laser-deposited Mo Sx films are also presented and discussed.

关键词： MoS_(2) laser ablation plasma ion acceleration quadrupole mass spectrometry PLD