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

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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

The potential for an old-growth forest to store carbon in the topsoil:A case study at Sasso Fratino,Italy

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Journal of Forestry Research 2024年第2期35卷 23-32页

作者： Tommaso Chiti Nicola Benilli Giovanni Mastrolonardo Giacomo Certini dipartimento per la Innovazione nei Sistemi Biologici Agroalimentari e Forestali(DIBAF)Universitàdella TusciaVia San C.de Lellis Snc01100 ViterboItaly dipartimento di Scienze e Tecnologie Agrarie AlimentariAmbientali e Forestali(DAGRI)Universitàdegli Studi di FirenzeP.le delle Cascine 1850144 FirenzeItaly

There is considerable interest devoted to oldgrowth forests and their capacity to store carbon(C)in biomass and *** of C stocks in old-growth forests are carried out worldwide,although there is a lack of information on their actual potential for C *** further understand this,soil organic carbon(SOC)was measured in one of Italy's best-preserved old-growth forests,the Sasso Fratino Integral Nature *** reserve is on the World Heritage List along with other ancient beech forests of Europe,and it is virtually untouched due to the steepness of the terrain,even before legal constraints were *** the sandstone-derived soils are often shallow,they are rich in organic ***,no quantification had been carried *** systematically sampling the topsoil across the forest,we accurately determined the average amount of SOC(62.0±16.9 Mg ha^(–1))and nitrogen(4.0±1.2 Mg ha^(–1))in the top 20 *** the CENTURY model,future dynamics of SOC stocks were predicted to 2050 according to two climate scenarios,A1F1 and B2,the first of high concern and the second more *** model projected an increase of 0.2 and 0.3 Mg ha^(–1)a^(–1)by 2030 under the A1F1 and B2 scenarios,respectively,suggesting that the topsoil in old-growth forests does not reach equilibrium but continues accumulating ***,from 2030 to 2050,a decline in SOC accumulation is predicted,indicating SOC net loss at high altitudes under the worst-case *** study confirms that soils in oldgrowth forests play a significant role in carbon *** also suggests that climate change may affect the potential of these forests to store SOC not only in the long term but also in the coming years.

关键词： Carbon sequestration CENTURY model Climate change Forest soil Soil nitrogen

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

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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

AC ripple on DC voltage:Experimental and theoretical investigation of the impact on accelerated ageing in electrical insulation

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High Voltage 2024年第4期9卷 902-910页

作者： Giovanni Gardan Gian Carlo Montanari dipartimento di Ingegneria Industriale Universita degli Studi di PadovaPadovaItaly Center for Advanced Power Systems Florida State UniversityTallahasseeFloridaUSA

With the increasing penetration of DC systems into the high voltage and medium voltage power industry,DC voltage is becoming common for distribution/transmission and to supply different typologies of *** allowable extent of AC ripple superimposed to DC,and its effect on insulation ageing,is a long-term discussed *** most harmful phenomenon causing extrinsic ageing acceleration and insulation system premature failure is partial discharges(PD);thus,the risk of incepting PD due to AC ripple could become a primary issue for electrical asset equipment *** this work,the impact of AC sinusoidal ripple on insulation system life and reliability is dealt with,considering both intrinsic and extrinsic ageing but focusing on the latter,that is,the PD *** are performed to assess how the jump voltage(due to AC ripple)and the DC component impact on PD activity in terms of amplitude and repetition *** the first time,the correlation between the magnitude of jump voltage associated with ripple and PD inception is established,shedding a light on the allowable ripple extent which does not impact significantly on ageing and premature insulation *** approach can provide straightforward tools for design specification and ageing inference of insulation systems.

关键词： impact insulation electrical

Gate-controlled supercurrent effect in dry-etched Dayem bridges of non-centrosymmetric niobium rhenium

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Nano Research 2024年第7期17卷 6575-6581页

作者： Jennifer Koch Carla Cirillo Sebastiano Battisti Leon Ruf Zahra Makhdoumi Kakhaki Alessandro Paghi Armen Gulian Serafim Teknowijoyo Giorgio De Simoni Francesco Giazotto Carmine Attanasio Elke Scheer Angelo di Bernardo Department of Physics University of KonstanzUniversitätsstraße 1078464 KonstanzGermany CNR-Spin c/o Universitàdegli Studi di Salernovia Giovanni Paolo II 13284084 Fisciano(SA)Italy NEST Istituto Nanoscienze-CNR and Scuola Normale SuperiorePiazza San Silvestro 1256127 PisaItaly dipartimento di Fisica“E.R.Caianiello” Universitàdegli Studi di SalernoVia Giovanni Paolo II 13284084 Fisciano(SA)Italy Advanced Physics Laboratory Institute for Quantum StudiesChapman UniversityBurtonsvilleMD 20866USA

The application of a gate voltage to control the superconducting current flowing through a nanoscale superconducting constriction,named as gate-controlled supercurrent(GCS),has raised great interest for fundamental and technological *** gain a deeper understanding of this effect and develop superconducting technologies based on it,the material and physical parameters crucial for the GCS effect must be ***-down fabrication protocols should also be optimized to increase device scalability,although studies suggest that top-down fabricated devices are more resilient to show a ***,we investigate gated superconducting nanobridges made with a top-down fabrication process from thin films of the noncentrosymmetric superconductor niobium rhenium with varying ratios of the constituents(NbRe).Unlike other devices previously reported and made with a top-down approach,our NbRe devices systematically exhibit a GCS effect when they were fabricated from NbRe thin films with small grain size and etched in specific *** observations pave the way for the realization of top-down-made GCS devices with high *** results also imply that physical parameters like structural disorder and surface physical properties of the nanobridges,which can be in turn modified by the fabrication process,are crucial for a GCS observation,providing therefore also important insights into the physics underlying the GCS effect.

关键词： superconductivity non-centrosymmetric superconductors superconducting devices gated devices gate-controlled supercurrent top-down fabrication

Long COVID and gut candidiasis:What is the existing relationship?

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World Journal of Gastroenterology 2024年第37期30卷 4104-4114页

作者： Filippo Bistagnino Davide Pizzi Filippo Mantovani Jacopo Rosso Antonino Marcos Roberto Tovani-Palone Department of Medical Biotechnology and Translational Medicine International Medical SchoolUniversitàdegli Studi di MilanoMilan 20054Italy Department of Biomedical Sciences for Health Universitàdegli Studi di MilanoMilan 20133Italy Department of Research Analytics Saveetha Dental College and HospitalsSaveetha Institute of Medical and Technical SciencesChennai 600077India

Since the beginning of the coronavirus disease(COVID)2019 pandemic,thou-sands of articles on the topic have been published,and although there is a growing trend of research on another associated condition,long coronavirus disease,important points still remain to be clarified in this *** evidence has suggested a relevant link between new clinical discoveries and molecular mechanisms that could be associated with the manifestations of different signs and symptoms involving cases of long ***,one of the existing gaps that requires further investigation concerns a possible rela-tionship between gut candidiasis and long *** recent studies also suggest an interplay between the occurrence of these two conditions,it is not yet fully clear how this may happen,as well as the specifics regarding the possible pathophysiological mechanisms *** this connection and with the advent of a potential strengthening of the body of evidence supporting the hypothesis of a link between gut candidiasis and long COVID,a better understanding of the clinical presentation,pathophysiology and clinical management of such a relationship should be essential and useful for both,additional advances towards more targeted research and appropriate case *** more about the signs,symptoms,and complications associated with cases of long COVID is essential in order to more effectively mitigate the related burden and provide a higher quality of care and life for the affected *** light of this and the need for better outcomes,here we review and discuss the content on different aspects of long COVID,including its pathophysiology and the existing evidence of a potential relationship between such a condition and gut candidiasis,as well as suggest propositions for future related *** Long coronavirus disease(COVID)is a condition characterized by the emergence of new symptoms or the persistence of existing symptoms for at least two months,

关键词： Post-acute COVID-19 syndrome COVID-19 Candidiasis Gastrointestinal microbiome Pandemics

Interplay between metabolic dysfunction-associated fatty liver disease and renal function: An intriguing pediatric perspective

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World Journal of Gastroenterology 2024年第15期30卷 2081-2086页

作者： Michele Nardolillo Fabiola Rescigno Mario Bartiromo Dario Piatto Stefano Guarino Pierluigi Marzuillo Emanuele Miraglia del Giudice Anna di Sessa Department of Woman Child and of General and Specialized SurgeryUniversitàdegli Studi della Campania“Luigi Vanvitelli”Naples 80138Italy

Over recent years,the nomenclature of non-alcoholic fatty liver disease has undergone significant ***,in 2020,an expert consensus panel proposed the term“Metabolic(dysfunction)associated fatty liver disease”(MAFLD)to underscore the close association of fatty liver with metabolic abnormalities,thereby highlighting the cardiometabolic risks(such as metabolic syndrome,type 2 diabetes,insulin resistance,and cardiovascular disease)faced by these patients since *** recently,this term has been further replaced with metabolic associated steatotic liver *** is worth noting that emerging evidence not only supports a close and independent association of MAFLD with chronic kidney disease in adults but also indicates its interplay with metabolic ***,comparable pediatric data remain *** the progressive and chronic nature of both diseases and their prognostic cardiometabolic implications,this editorial aims to provide a pediatric perspective on the intriguing relationship between MAFLD and renal function in childhood.

关键词： Metabolic(dysfunction)associated fatty liver disease Renal Function Children Obesity

Novel emphasis on somatostatinergic system in retinal ganglion cell neuroresilience

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Neural Regeneration Research 2024年第1期19卷 148-149页

作者： Elisabetta Catalani Davide Cervia Department for Innovation in Biological Agro-food and Forest Systems(DIBAF)Universitàdegli Studi della Tuscialargo dell’UniversitàsncViterboItaly

The neuromodulatory peptide somatostatin(somatotropin release inhibiting factor,SRIF)-14 acts at multiple levels through five SRIF receptor subtypes(sst1 to sst5).SRIF-28 is also derived from a common propeptide translated from a single SRIF gene,although SRIF-14 is the predominant form in the mammalian nervous *** to its short half-life,synthetic SRIF analogs have been developed over the years and are available for therapeutic approaches.

关键词： life system predominant

A novel approach to the dynamic response analysis of Euler-Bernoulli beams resting on a Winkler soil model and subjected to impact loads

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Earthquake Engineering and Engineering Vibration 2024年第2期23卷 389-401页

作者： Adolfo Foriero Filippo Santucci de Magistris Giovanni Fabbrocino Département de génie civil et de génie des eaux Pavillon Adrien-PouliotUniversitéLavalQuébecCanada dipartimento di Bioscienze e Territorio Universitàdegli Studi del MoliseCampobassoItaly Construction Technologies Institute National Research CouncilITC-CNRL’AquilaItaly

This work presents a novel approach to the dynamic response analysis of a Euler-Bernoulli beam resting on a Winkler soil model and subjected to an impact *** approach considers that damping has much less importance in controlling the maximum response to impulsive loadings because the maximum response is reached in a very short time,before the damping forces can dissipate a significant portion of the energy input into the *** development of two sine series solutions,relating to different types of impulsive loadings,one involving a single concentrated force and the other a distributed line load,are *** study revealed that when a simply supported Euler-Bernoulli beam,resting on a Winkler soil model,is subject to an impact load,the resulting vertical displacements,bending moments and shear forces produced along the span of the beam are considerably *** particular,the quantification of this effect is best observed,relative to the corresponding static solution,via an amplification *** computed impact amplification factors,for the sub-grade moduli used in this study,were in magnitude greater than 2,thus confirming the multiple-degree-of-freedom nature of the problem.

关键词： beam-Winkler-soil model sub-grade moduli impact load impact distributed line load dynamic solution impact amplification factor