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Aggregate 2022年第4期3卷 114-120页

作者： Navathej Preetha Genesh fabrizio de marchi Stefan Heun Stefano Fontana Rachid Belkhou Rahul Purandare Nunzio Motta Anna Sgarlata Massimo Fanfoni Jennifer MacLeod Oliver MacLean Federico Rosei CentreÉnergie Matériaux et TélécommunicationsInstitut National de la Recherche ScientifiqueQuébecCanada NEST Istituto Nanoscienze-CNR and Scuola Normale SuperiorePisaItaly Sincrotrone Trieste SCpA BasovizzaItaly LURE UniversitéParis-SudOrsay CedexFrance School of Chemistry and Physics and Centre for Materials Science Queensland University of TechnologyBrisbaneAustralia Dipartimento di Fisica Universitàdi Roma“Tor Vergata”RomeItaly Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education Jilin Normal UniversityChangchunP.R.China

Heteroepitaxial growth is a process of profound fundamental importance as well as an avenue to realize nanostructures such as Ge/Si quantum dots(QDs),with appealing properties for applications in opto-and ***,controlling the Ge/Si QD size,shape,and composition remains a major obstacle to their practical ***,Ge nanostructures on Si(111)were investigated in situ and in real-time by low energy electron microscopy(LEEM),enabling the observation of the transition from wetting layer formation to 3D island growth and *** island size,shape,and distribution depend strongly on the growth *** the deposition temperature increases,the islands become larger and sparser,consistent with Brownian nucleation and capture *** 550◦C,two distinct Ge/Si nanostructures are formed with bright and dark appearances that correspond to flat,atoll-like and tall,faceted islands,*** annealing,the faceted islands increase in size at the expense of the flat ones,indicating that the faceted islands are thermodynamically more *** contrast,triangular islands with uniform morphology are obtained from deposition at 600◦C,suggesting that the growth more closely follows the ideal *** annealing,the islands formed at 600◦C initially show no change in morphology and size and then rupture simultaneously,signaling a homogeneous chemical potential of the *** observations reveal the role of dynamics and energetics in the evolution of Ge/Si QDs,which can serve as a step towards the precise control over the Ge nanostructure size,shape,composition,and distribution on Si(111).

关键词： epitaxial growth GeSi heterostructures low energy electron microscopy

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Nonlinear versus linearised model on stand density model fitting and stand density index calculation: analysis of coefficients estimation via simulation

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Journal of Forestry Research 2019年第5期30卷 1595-1602页

作者： Maurizio marchi CREA-Research Centre for Forestry and Wood geoLAB-Laboratory of Forest Geomatics Department of Agriculture Food Environment and Forestry Università degli Studi di Firenze

The stand density index,one of the most important metrics for managing site occupancy,is generally calculated from empirical data by means of a coefficient derived from the“self-thinning rule”or stand density model.I undertook an exploratory analysis of model fitting based on simulated data.I discuss the use of the logarithmic transformation(i.e.,linearisation)of the relationship between the total number of trees per hectare(N)and the quadratic mean diameter of the stand(QMD).I compare the classic method used by Reineke(J Agric Res 46:627–638,1933),i.e.,linear OLS model fitting after logarithmic transformation of data,with the“pure”powerlaw model,which represents the native mathematical structure of this relationship.I evaluated the results according to the correlation between N and *** OLS and nonlinear fitting agreed in the estimation of coefficients only for highly correlated(between-1 and-0.85)or poorly correlated([-0.39)*** average correlation values(i.e.,between-0.75 and-0.4),it is probable that for practical applications,the differences were relevant,especially concerning the key coefficient for Reineke’s stand density index *** introduced a non-negligible bias in SDI *** linearised log–log model always estimated a lower slope term than did the exponent of the nonlinear function except at the extremes of the correlation *** the logarithmic transformation is mathematically correct and always equivalent to a nonlinear model in case of prediction of the dependent variable,the difference detected in my studies between the two methods(i.e.,coefficient estimation)was directly related to the correlation between N and QMD in each simulated/disturbed *** general,given the power law as the“natural”structure of the N versus QMD relationship,the nonlinear model is preferred,with a logarithmic transformation used only in the case of violation of parametric assumptions(*** distributed non-normally).

关键词： Ordinary least squares Power law Reineke function Silviculture Ecological mathematics Forest mathematics

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Weakly Admissible Meshes and Discrete Extremal Sets

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Numerical Mathematics(Theory,Methods and Applications) 2011年第1期4卷 1-12页

作者： Len Bos Stefano de marchi Alvise Sommariva Marco Vianello department of Computer Science University of VeronaStrada Le Grazie 15-37134 VeronaItaly department of Pure and Applied Mathematics University of PaduaVia Trieste 63-35121 PaduaItaly

We present a brief survey on (Weakly) Admissible Meshes and corresponding Discrete Extremal Sets, namely Approximate Fekete Points and Discrete Leja *** provide new computational tools for polynomial least squares and interpolationon multidimensional compact sets, with different applications such as numerical cubature, digital filtering, spectral and high-order methods for Pdes.

关键词： Weakly admissible meshes Approximate Fekete points Discrete Leja points

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REFERENCE FUNCTIONAL AND CHARACTERISTIC SPACE FOR LAGRANGE AND BERNSTEIN OPERATORS

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Analysis in Theory and Applications 1995年第4期11卷 6-14页

作者： S.de marchi M.Morandi Cecchi dept. of Pure and Applied Math. Via Belzoni 7-Padova ItalyDept. of Pure and Applied Math. Via Belzoni 7-Padova Italy

This paper deals with the description and the representation of polynomials defined over n-simplices, The polynomials are computed by using two recurrent schemes: the Neville-Aitken one for the Lagrange interpolating operator and the de Casteljau one for the Bernstein-Bezier approximating operator. Both schemes fall intothe framework of transformations of the form where the F iare given numbers (forexample, at the initial step they coincide with the values of the function on a given lattice), and the coefficients (x) are linear polynomials valued in x and x is fixed. A general theory for such sequence of transformations can be found in [2] where it is also proved that these tranformations are completely characterized in term of a linear functional, reference functional. This functional is associated with a linear space., characteristic *** concepts of reference functionals and characteristic spaces will be used and we shall prove the existence of a characteristic space for the reference functional: associated with these operators.

关键词： REFERENCE FUNCTIONAL AND CHARACTERISTIC SPACE FOR LAGRANGE AND BERNSTEIN OPERATORS

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Hemodynamic monitoring during liver transplantation:A state of the art review

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World Journal of Hepatology 2015年第10期7卷 1302-1311页

作者： Mona Rezai Rudnick Lorenzo de marchi Jeffrey S Plotkin department of Anesthesiology Georgetown University Hospital

Orthotopic liver transplantation can be marked by significant hemodynamic instability requiring the use of a variety of hemodynamic monitors to aide in intraoperative management. Invasive blood pressure monitoring is essential,but the accuracy of peripheral readings in comparison to central measurements has been questioned. When discrepancies exist,central mean arterial pressure,usually measured at the femoral artery,is considered more indicative of adequateperfusion than those measured peripherally. The traditional pulmonary artery catheter is less frequently used due to its invasive nature and known limitations in measuring preload but still plays an important role in measuring cardiac output(CO) when required and in the management of portopulmonary hypertension. Pulse wave analysis is a newer technology that uses computer algorithms to calculate CO,stroke volume variation(SVV) and pulse pressure variation(PPV). Although SVV and PPV have been found to be accurate predicators of fluid responsiveness,CO measurements are not reliable during liver transplantation. Transesophageal echocardiography is finding an increasing role in the realtime monitoring of preload status,cardiac contractility and the diagnosis of a variety of pathologies. It is limited by the expertise required,limited transgastric views during key portions of the operation,the potential for esophageal varix rupture and difficulty in obtaining quantitative measures of CO in the absence of tricuspid regurgitation.

关键词： Intraoperative monitoring Physiologicmonitoring Liver transplantation

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Alginate controls heartburn in patients with erosive and nonerosive reflux disease

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World Journal of Gastroenterology 2012年第32期18卷 4371-4378页

作者： Edoardo Savarino Nicola de Bortoli Patrizia Zentilin Irene Martinucci Luca Bruzzone Manuele Furnari Santino marchi Vincenzo Savarino Division of Gastroenterology Department of Internal MedicineUniversity of Genoa16126 GenoaItaly Division of Gastroenterology Department of SurgicalOncological and Gastroenterological SciencesUniversity of Padua35128 PaduaItaly Division of Gastroenterology Department of Internal MedicineUniversity of Pisa56100 PisaItaly

AIM:To evaluate the effect of a novel alginate-based compound,Faringel,in modifying reflux characteristics and controlling ***:In this prospective,open-label study,40 patients reporting heartburn and regurgitation with proven reflux disease(i.e.,positive impedance-pH test/evidence of erosive esophagitis at upper endoscopy) underwent 2 h impedance-pH testing after eating a refluxogenic *** were studied for 1 h under basal conditions and 1 h after taking 10 mL *** both sessions,measurements were obtained in right lateral and supine decubitus *** also completed a validated questionnaire consisting of a 2-item 5-point(0-4) Likert scale and a 10-cm visual analogue scale(VAS) in order to evaluate the efficacy of Faringel in symptom *** of the treatment was assessed using a 6-point Likert scale ranging from very good(1) to very poor(6).RESULTS:Faringel decreased significantly(P decubitus positions,esophageal acid exposure time [median 10(25th75th percentil 6-16) vs 5.8(4-10) and 16(11-19) vs 7.5(5-11),respectively] and acid refluxes [5(3-8) vs 1(1-1) and 6(4-8) vs 2(1-2),respectively],but increased significantly(P decreased in both decubitus positions(60% vs 32% and 64% vs 35%,respectively;P dest adverse events(i.e.,nausea and bloating).CONCLUSION:Our findings demonstrate t

关键词： Impedance pH-metry Nonerosive reflux disease Erosive esophagitis Nonacid reflux Proximal reflux

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Overlap of functional heartburn and gastroesophageal reflux disease with irritable bowel syndrome

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World Journal of Gastroenterology 2013年第35期19卷 5787-5797页

作者： Nicola de Bortoli Irene Martinucci Massimo Bellini Edoardo Savarino Vincenzo Savarino Corrado Blandizzi Santino marchi Division of Gastroenterology University of Pisa Division of Gastroenterology University of Padua Division of Gastroenterology University of Genoa Division of Pharmacology and Chemotherapy University of Pisa

Several studies indicate a significant degree of overlap between irritable bowel syndrome(IBS)and gastroesophageal reflux disease(GERD).Likewise,both functional heartburn(FH)and IBS are functional digestive disorders that may occur in the same ***,data establishing a solid link between FH and IBS are lacking,mainly because the clinical definition of FH has undergone substantial changes over the *** available literature on the overlap between GERD or FH and IBS highlights considerable heterogeneity in terms of the criteria and diagnostic procedures used to assess heartburn and *** particular,several epidemiological studies included patients with concomitant IBS and GERD without any attempt to distinguish FH(as defined by the RomeⅢcriteria)from GERD via pathophysiological *** of these critical issues,there is preliminary evidence supporting a significantdegree of FH-IBS *** underscores the need for studies based on updated diagnostic criteria and accurate pathophysiological classifications,particularly to distinguish FH from *** distinction would represent an essential starting point to achieving a better understanding of pathophysiology in the subclasses of patients with GERD and FH and properly assessing the different degrees of overlap between IBS and the subcategories of *** present review article intends to appraise and critically discuss current evidence supporting a possible concomitance of GERD or FH with IBS in the same patients and to highlight the pathophysiological relationships between these disorders.

关键词： Functional gastrointestinal disorders Gastroesophageal reflux disease/Gastro-oesophageal reflux disease Irritable bowel syndrome Acidity(esophageal) Hypersensitivity

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Irritable bowel syndrome and chronic constipation: Fact and fiction

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World Journal of Gastroenterology 2015年第40期21卷 11362-11370页

作者： Massimo Bellini Dario Gambaccini Paolo Usai-Satta Nicola de Bortoli Lorenzo Bertani Santino marchi Cristina Stasi Gastrointestinal Unit Department of GastroenterologyUniversity of Pisa Gastrointestinal Unit P. Brotzu Hospital department of Experimental and Clinical Medicine University of Florence Epidemiological Observatory Regional Health Agency of Tuscany

Irritable bowel syndrome(IBS) and functional constipation(FC) are the most common functional gastrointestinal disorders. According to the Rome ⅢCriteria these two disorders should be theoretically separated mainly by the presence of abdominal pain or discomfort relieved by defecation(typical of IBS) and they should be mutually exclusive. However,many gastroenterologists have serious doubts as regards a clear separation. Both IBS-C and FC,often associated with many other functional digestive and non digestive disorders,are responsible for a low quality of life. The impact of the media on patients' perception of these topics is sometimes disruptive,often suggesting a distorted view of pathophysiology,diagnosis and therapy. These messages frequently overlap with previous subjective opinions and are further processed on the basis of the different culture and the previous experience of the constipated patients,often producing odd,useless or even dangerous behaviors. The aim of this review was to analyze the most common patients' beliefs about IBS-C and CC,helping physicians to understand where they should focus their attention when communicating with patients,detecting false opinions and misconceptions and correcting them on the basis of scientific evidence.

关键词： Irritable bowel syndrome Chronic constipation Func

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Past,present and future of industrial plantation forestry and implication on future timber harvesting technology

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Journal of Forestry Research 2020年第2期31卷 339-351页

作者： Andrew McEwan Enrico marchi Raffaele Spinelli Michal Brink department of Agriculture Food and Forest SystemsFlorence UniversityVia San Bonaventura1350145 FlorenceItaly School of Natural Resource Management Nelson Mandela Metropolitan UniversityGeorge CampusGeorgeSouth Africa Consiglio Nazionale delle Ricerche Istituto per la BioEconomiaVia Madonna del Piano 10Sesto FiorentinoItaly Australian Forest Operations Research Alliance University of the Sunshine CoastLocked Bag 4Maroochydore DCQLD 4558Australia University of Pretoria Private Bag X20HatfieldPretoria 0028South Africa

Plantation forests are established,and expanding,to satisfy increasing global demand for timber *** societal values,such as safety,productivity,environmental,quality and social are influencing the plantation forestry *** is primarily driven through an ever increasing world population,which in turn influences the way nations view the value systems by which they *** people require more resources-also forest ***,the availability of information is influencing the pace of technological *** changes could result in a difference in the management of plantations that could affect the forest engineering systems of the *** review aimed to summarize the current status of plantation forests;summarize future developments and possible scenarios in forest plantation management for the various products;and assess whether these developments in a plantation environment could affect the harvesting systems *** influencing the form of plantations include the type and nature of the plantation owner;the change in demand for different and new forest products;climate change factors,including the use of biomass for energy,carbon sequestration and trading;ecosystem services and other products and services;and sustainability certification of forest *** impact and influence of these factors were summarised into a series of key drivers that will influence the technology used in harvesting machines,as well as the choice of harvesting machines,systems and *** drivers were the effect of variations in tree size,the expansion of plantation areas onto more difficult terrain,diversity in plantation design,increased attention towards site impacts and the increased use of biomass for *** information is provided regarding how the harvesting systems could be affected.

关键词： Plantations Forest products Biomass Harvesting system Mechanization Trends Technology

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Douglas-fir climate sensitivity at two contrasting sites along the southern limit of the European planting range

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Journal of Forestry Research 2020年第6期31卷 2193-2204页

作者： Cristiano Castaldi Maurizio marchi Giorgio Vacchiano Piermaria Corona CREA-Research Centre for Forestry and Wood Viale S.Margherita 8052100 ArezzoItaly Universitàdegli Studi di Milano DISAAVia Celoria 220133 MilanItaly

Douglas-fir(Pseudotsuga menziesii(Mirb.)Franco)is an important exotic tree species that was planted across a large part of Europe during the last *** both experimental trials and conventional forest plantations,the trees grow at a high rate and produce high-quality *** present study investigated climate-growth relationships of Douglas-fi r at two Italian sites that contrast in climate:a Mediterranean area in southern Italy(Mercurella site)and a cooler,moister site in the northern Apennines without summer aridity(Acquerino).The relationship between tree-ring chronologies and monthly climatic variables was evaluated by a moving average and correlation *** showed that the minimum temperature in February and in March play a key role for Douglas-fi r at both sites,with a positive eff ect on *** the northern site,it is also highly sensitive to late summer temperatures(negative correlation)and spring–summer precipitation(positive correlation).Growth rates in southern latitudes were high even in Europe and in the Mediterranean environment,with low sensitivity to climatic fl *** the basis of our results,further common garden experiments should test adaptation and the interaction between genetics and environment of second-or third-generation seeds from old stands across Europe such as done by the old International Union of Forest Research Organizations(IUFRO)or the European Douglasfi r Improvement Research Cooperative(EUDIREC)experimentation programmes.

关键词： Pseudotsuga menziesii Tree ring analysis dendroclimatology Forest plantations Exotic forest species

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