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| 1 | Sand transport in multiphase flow mixtures in a horizontal pipeline:An experimental investigation显示文摘An inherent problem with both oil and natural gas production is the deposition of sand particles in pipeline,which could lead to problems such as excessive pressure drops,equipment failure,pipeline erosion,and production decline.The characterization of sand particles transport and sedimentation in different flow systems such as sandemultiphase mixtures is vital to predict the sand transport velocity and entrainment processes in oil and gas transportation pipelines.However,it seems that no model exists able to accurately characterize the sand transport and deposition in multiphase pipeline.In fact,in the last decade several researchers tried to extend the modeling of liquid-solid flow to gas-liquid-solid flow,but no significant results have been obtained,especially in slug flow condition due to the complexity of the phenomenon.In order to develop and validate a mathematical model properly formulated for the calculation of the sand critical deposition velocity in gas-liquid flow,more and more experimental data are necessary.This paper presents a preliminary experimental study of three phase flows(air-water-sand)inside a horizontal pipe and the application of the sand-liquid models present in literature.Significant observations were made during the experimental study from which several conclusions were drawn.Different sand flow regimes were established by physical observation and data analysis:fully dispersed solid flow,moving dunes and stationary bed.The critical deposition velocities were determined at different sand concentrations.It was concluded that sand transport characteristics and the critical deposition velocity are strongly dependent on the gas-liquid flow regime and on sand concentration. | Mariella Leporini Barbara Marchetti Francesco Corvaro Giuseppe di Giovine Fabio Polonara Alessandro Terenzi | 2019 | Petroleum2019，5，2： | 1 |
| 2 | Therapeutic potential of MEK inhibition in acute myelogenous leukemia: rationale for “vertical” and “lateral” combination strategies显示文摘 | Maria Ricciardi Maria Scerpa Paola Bergamo Ludovica Ciuffreda Maria Petrucci Sabina Chiaretti Simona Tavolaro Maria Mascolo Stephen Abrams Linda Steelman Twee Tsao Antonio Marchetti Marina Konopleva Donatella Bufalo Francesco Cognetti Robin Foà Michael An | 2012 | Journal of Molecular Medicine2012，，10： | 1 |
| 3 | The E23K Variant of KCNJ11 Encoding the Pancreatic β-Cell Adenosine 5′-Triphosphate-Sensitive Potassium Channel Subunit Kir6.2 Is Associated with an Increased Risk of Secondary Failure to Sulfonylurea in Patients with Type 2 Diabetes显示文摘 | Giorgio Sesti Emanuela Laratta Marina Cardellini Francesco Andreozzi Silvia Del Guerra Concetta Irace Agostino Gnasso Maria Grupillo Renato Lauro Marta Letizia Hribal Francesco Perticone Piero Marchetti | 2006 | The Journal of Clinical Endocrinology & Metabolism2006，，6： | 1 |
| 4 | Implant Infection After Augmentation Mammaplasty: A Review of the Literature and Report of a Multidrug-Resistant Candida albicans Infection 显示文摘 | Luca A Dessy Federico Corrias Francesco Marchetti | 2012 | Aesth Plast Surg2012，36，： | 1 |
| 5 | Secondary analyses from a randomized clinical trial: age as the key prognostic factor in endometrial carcinoma显示文摘 | Pierluigi Benedetti Panici Stefano Basile Maria Giovanna Salerno Violante Di Donato Claudia Marchetti Giorgia Perniola Antonio Palagiano Alessandra Perutelli Francesco Maneschi Andrea Alberto Lissoni Mauro Signorelli Giovanni Scambia Saverio Tateo Giorgia | 2013 | American Journal of Obstetrics and Gynecology2013，，： | 1 |
| 6 | Dose-dependent effect of adipose-derived adult stem cells on vertical bone regeneration in rabbit calvarium显示文摘 | Francesco Pieri Enrico Lucarelli Giuseppe Corinaldesi Nicolò Nicoli Aldini Milena Fini Annapaola Parrilli Barbara Dozza Davide Donati Claudio Marchetti | 2010 | Biomaterials2010，，13： | 1 |
| 7 | Calmodulin Expression Distinguishes the Smooth Muscle Cell Population of Human Carotid Plaque显示文摘 | Matteo Coen Giovanna Marchetti Patricia M. Palagi Carlotta Zerbinati Giuseppe Guastella Teresa Gagliano Francesco Bernardi Francesco Mascoli Marie-Luce Bochaton-Piallat | 2013 | The American Journal of Pathology2013，，： | 1 |
| 8 | Development and application of an innovative tool to automate the process of results extraction from the thermo-hydraulic simulator Olga显示文摘This paper presents the development and application of an innovative code to extract in an automated way data from the thermo-hydraulic simulator Olga.The results show that the tool can significantly reduce the time needed for the data extraction procedure and increase the reliability of results due to the fact that there is no more the need of the human operator.Moreover,during the data extraction phase,the Olga code is available for running different simulations allowing to optimize the use of this resource. | Francesco Carducci Antonio Del Monaco Giancarlo Giacchetta Mariella Leporini Barbara Marchetti | 2015 | Petroleum2015，1，2： | 0 |
| 9 | Monitoring the abundance of saproxylic red-listed species in a managed beech forest by landsat temporal metrics显示文摘Background:Rapid climate changes lead to an increase in forest disturbance,which in turn lead to growing concerns for biodiversity.While saproxylic beetles are relevant indicators for studying different aspects of biodiversity,most are smaller than 2 mm and difficult to sample.This,together with a high number of species and trophic roles,make their study remarkably challenging,time-consuming,and expensive.The Landsat mission provides data since 1984 and represents a powerful tool in this scenario.While we believe that remote sensing data cannot replace on-site sampling and analysis,in this study we aim to prove that the Landsat Time Series(TS)may support the identification of insects’hotspots and consequently guide the selection of areas where to concentrate field analysis.Methods:With this aim,we constructed a Landsat-derived NDVI TS(1984–2020)and we summarised the NDVI trend over time by calculating eight Temporal Metrics(TMs)among which four resulted particularly successful in predicting the amount of saproxylic insects:(i)the slope of the regression line obtained by linear interpolating the NDVI values over time;(ii)the Root Mean Square Error(RMSE)between the regression line and the NDVI TS;(iii)the median,and the(iv)minimum values of the NDVI TS.The study area consists of four monitoring sectors in a Mediterranean-managed beech forest located in the Apennines(Molise,Italy),where 60 window flight traps for flying beetles were installed.First,the saproxylic beetle's biodiversities of monitoring sectors were quantified in terms of species richness and alpha-diversity.Second,the capability of TMs in predicting the richness of saproxylic beetles family and trophic categories was assessed in terms of Pearson's product-moment correlation.Results:The alpha diversity and species richness analysis indicate dissimilarities across the four monitored sectors(Shannon and Simpson's index ranging between 0.67 to 2.31 and 0.69 to 0.88,respectively),with Landsat TS resulting in effective predictors for estimating saproxylic beetle richness.The strongest correlation was reached between the Monotomidae family and the RMSE temporal metric(R=0.66).The mean absolute correlation(r)between the NDVI TMs and the saproxylic community was 0.46 for Monotomidae,0.31 for Cerambycidae,and 0.25 for Curculionidae.Conclusions:Our results suggest that Landsat TS has important implications for studying saproxylic beetle distribution and,by helping the selection of monitoring areas,increasing the amount of information acquired while decreasing the effort required for field analysis. | Francesco Parisi Elia Vangi Saverio Francini Gherardo Chirici Davide Travaglini Marco Marchetti Roberto Tognetti | 2022 | Forest Ecosystems2022，9，4： | 0 |
| 10 | Diversity of beetle species and functional traits along gradients of deadwood suggests weak environmental filtering显示文摘Background: Gradients in local environmental characteristics may favour the abundance of species with particular traits, while other species decline, or favour species with different traits at the same time, without an increase in average species abundances. Therefore, we asked: do variations in species and traits differ along gradients of deadwood variables? Do species abundance and trait occurrence change with species richness within or between functional groups? Thus, we analysed the beetle assemblages of five forest sites located in Italy, along the Apennines mountains.Methods: From 2012 to 2018 we sampled beetles and five deadwood types in 193 plots to characterise the deadwood gradient: standing dead trees, snags, dead downed trees, coarse woody debris, and stumps. We modelled beetle species relative abundances and trophic traits occurrences against the deadwood variables using joint species distribution models.Results: Out of 462 species, only 77 showed significant responses to at least one deadwood type, with a weak mean response across species. Trophic groups showed mostly negative responses to deadwood variables. Species abundance increased with species richness among sites only for phytophagous and saproxylophagous. Trait occurrence did not increase with species richness among sites, except for phytophagous and saproxylophagous.However, trait occurrence changed significantly with species richness of several trophic groups within some sites.We found that increases in species richness do not result in decreases in species abundance of a given trophic group, but rather null or positive relationships were found suggesting low interspecific competition.Conclusions: Our findings suggest that in Mediterranean mountain forests there is still room for increasing the level of naturalness, at least for what concerns deadwood management. On one side, our findings suggest that competition for deadwood substrates is still low, on the other side they indicate that increasing deadwood volume and types to improve overall beetle richness may increase also beetle abundances. | Marco Basile Francesco Parisi Roberto Tognetti Saverio Francini Fabio Lombardi Marco Marchetti Davide Travaglini Elena De Santis Gherardo Chirici | 2023 | Forest Ecosystems2023，10，1： | 0 |
| 11 | Reliability,Availability,Maintainability(RAM)study,on reciprocating compressors API 618显示文摘The Oil&Gas industry has continuously increased its requirements and together with the high complexity of technological systems and the higher competitiveness of markets,has compelled providers to implement adequate management strategies for these systems in order to improve their availability and productivity to meet those more demanding criteria.In this context,the complex of RAM factors constitute a strategic approach for integrating reliability,availability and maintainability,by using methods,tools and engineering techniques(Mean Time to Failure,Equipment down Time and System Availability values)to identify and quantify equipment and system failures that prevent the achievement of the productive objectives.The application of such methodologies requires a deep experience and know-how together with the possibility of acquiring and processing data in operating conditions.This paper presents the most relevant aspects and findings of a study conducted for assessing the operational performance of a reciprocating compressor system package installed and used in the oil and gas'industries.The study was based on the analysis of the behaviour of states defined for each individual parts and component of reciprocating compressor and also aimed to identify and evaluate the effects of RAMtype factors and was conducted in collaboration with a private company that,for privacy reasons,will be named RC company.The Methodologies procedures used in this descriptive study were the bibliographical research,documentary and content analysis of the main literature.Adopting the most suitable maintenance strategy is one of the main challenges that maintenance managers face.The main purpose of this work is to propose a new approach to evaluate maintenance strategies.In this study,three criteria called reliability,availability and maintainability(RAM)have been employed to compare to future maintenance strategies. | Francesco Corvaro Giancarlo Giacchetta Barbara Marchetti Maurilio Recanati | 2017 | Petroleum2017，3，2： | 0 |
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