检索结果-南通市图书馆

维普期刊数据库

A Supersonic Plasma Jet Source for Controlled and Efficient Thin Film Deposition

在线全文

学校读者我要写书评

暂无评论

Journal of Modern Physics 2012年第10期3卷 1626-1638页

作者： Ilaria Biganzoli Francesco Fumagalli Fabio Di Fonzo Ruggero Barni claudia riccardi Center for Nano Science and Technology Italian Institute of Technology Milano Italy Dipartimento di Fisica Occhialini Università degli Studi di Milano-Bicocca Milano Italy

A novel plasma source suitable for controllable nanostructured thin film deposition processes is proposed. It exploits the separation of the process in two distinct phases. First precursor dissociation and radical formation is performed in a dense oxidizing plasma. Then nucleation and aggregation of molecular clusters occur during the expansion into vacuum of a supersonic jet. This allows a superior control of cluster size and energy in the process of film growth. Characterization of the plasma state and source performances in precursor dissociation have been investigated. The performances of this new Plasma Assisted Supersonic Jet Deposition technique were demonstrated using organic compounds of titanium to obtain TiO2 thin nanostructured films.

关键词： Plasma Sources ICP Discharges PECVD Plasma Diagnostics Titanium Dioxide Thin Film Deposition

Toward molecular models of proton pumping:Challenges,methods and relevant applications

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 Chemistry 2012年第1期55卷 3-18页

作者： riccardi Demian GOYAL Puja Department of Chemistry and Theoretical Chemistry Institute University of Wisconsin

Motivated by several long-lasting mechanistic questions for biomolecular proton pumps,we have engaged in developing hybrid quantum mechanical/molecular mechanical(QM/MM) methods that allow an efficient and reliable description of long-range proton transport in transmembrane *** this review,we briefly discuss several relevant issues:the need to develop a "multi-scale" generalized solvent boundary potential(GSBP) for the analysis of chemical events in large trans-membrane proteins,approaches to validate such a protocol,and the importance of improving the flexibility of QM/MM *** recent studies of model and realistic protein systems are also discussed to help put the discussions into ***,these studies suggest that the QM/MM-GSBP framework based on an approximate density functional theory(SCC-DFTB) as QM holds the promise to strike the proper balance between computational efficiency,accuracy and *** additional improvements in the methodology and recent developments by others,especially powerful sampling techniques,this "multi-scale" framework will be able to help unlock the secrets of proton pumps and other biomolecular machines.

关键词： proton pumping QM/MM simulations SCC-DFTB microscopic pKa multi-scale simulations

维普期刊数据库

The marine Jurassic of Argentina： a biostratigraphic framework

在线全文

学校读者我要写书评

暂无评论

Episodes 2008年第3期31卷 326-335页

作者： Alberto C. riccardi Facultad de Cieneias Naturales y Museo Universidad Nacional de La Plata Paseo del Bosque s/n 1900 La Plata Argentina

In Argentina the best and most complete marine Juras- sic succession is exposed between 32° and 39° S, along a N-S belt roughly coincident with the border with Chile. Here all stages, except the Kimmeridgian, are represented by marine facies. Ammonites have provided a biostratigraphic framework to date and correlate lithostratigraphic units and sequences, to reconstruct the history of the marine fill, and allow the development of other palaeontological and geological studies. Recent studies on the systematics and/or biostratigra- phy of Andean ammonites have provided the basis for the presentation of a summary of the 45 ammonite zones of the Jurassic of west-central Argentina and to stress its significance in reconstructing the palaeogeographic evolution of that region.

关键词：侏罗纪海洋阿根廷生物地层学

Dynamic contrast enhanced ultrasound in gastrointestinal diseases:A current trend or an indispensable tool?

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2023年第25期29卷 4021-4035页

作者： Mattia Paratore Matteo Garcovich Maria Elena Ainora Laura riccardi Antonio Gasbarrini Maria Assunta Zocco Medicina Interna e Gastroenterologia CEMAD Digestive Disease CenterFondazione Policlinico Universitario A.Gemelli IRCCSRome 00168Italy Medicina Interna e Gastroenterologia CEMAD Digestive Disease CenterUniversità Cattolica del Sacro CuoreFondazione Policlinico Universitario A.Gemelli IRCCSRome 00168Italy

Contrast enhanced ultrasound(CEUS)has been widely implemented in clinical practice because of the enormous quantity of information it provides,along with its low cost,reproducibility,minimal invasiveness,and safety of the secondgeneration ultrasound contrast *** overcome the limitation of CEUS given by the subjective evaluation of the contrast enhancement behaviour,quantitative analysis of contrast kinetics with generation of time-intensity curves has been introduced in recent *** quantification of perfusion parameters[named as dynamic-CEUS(D-CEUS)]has several applications in gastrointestinal neoplastic and inflammatory ***,the limited availability of large studies and the heterogeneity of the technologies employed have precluded the standardisation of D-CEUS,which potentially represents a valuable tool for clinical practice in management of gastrointestinal *** this article,we reviewed the evidence exploring the application of D-CEUS in gastrointestinal diseases,with a special focus on liver,pancreas,and inflammatory bowel diseases.

关键词： Quantitative perfusion analysis Gastrointestinal diseases Time-intensity curve Multiparametric ultrasound

Modelling extraordinary floods and sedimentological processes in a large channel-floodplain system of the Lower Paran River(Argentina)

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 Sediment Research 2015年第2期30卷 150-159页

作者： Marina L.Garcia Pedro A.Basile Gerardo A.riccardi José F.Rodriguez Hydraulics Department School of Civil EngineeringFaculty of Exact SciencesEngineering and Land SurveyingNational University of Rosario Centre for Hydro-Environmental Research Faculty of Exact SciencesEngineering and Land SurveyingNational University of Rosario Research Council of National University of Rosario(CIUNR) Civil Surveying and Environmental EngineeringUniversity of Newcastle

A quasi-2D unsteady flow and sediment transport model suitable for the simulation of large lowland river systems,including their floodplains,is *** water flow and sediment equations are discretised using an interconnected irregular cells scheme,in which different simplifications of the 1D de Saint Venant equations are used to define the discharge laws between ***-distributed transport and deposition of fine sediments throughout the river-floodplain system are *** model is applied over a 208-km reach of the Parana River between the cities of Diamante and Ramallo（Argentina） comprising a river-floodplain area of 8100 km;.After calibration and validation,the model is applied to predict water and sediment dynamics during synthetically generated extraordinary floods of100,1000,and 10,000 years return *** potential impact of a 56-km long road embankment constructed across the entire floodplain is simulated and compared to model results without the *** embankment results in increases in upstream water levels,inundation extent,flow duration,and sediment deposition.

关键词： Fluvial hydraulics Numerical modelling Floodplain sedimentation Lowland rivers Parana River

Simulation of erosion-deposition processes at basin scale by a physically-based mathematical model

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

International Journal of Sediment Research 2010年第2期25卷 91-109页

作者： Pedro A. BASILE Gerardo A. riccardi Erik D. ZIMMERMANN Hernán R. STENTA Hydraulics Department School of Civil EngineeringNational University of Rosario Research Scientist Centre for Hydro-Environmental ResearchNational University of Rosario Research Scientist Research Council of National University of Rosario(CIUNR) Research Scientist National Council of Scientific and Technical Research(CONICET)

The development and application of the physically-based and spatially-distributed mathematical model CTSS8-SED is presented. The model simulates hydrologic-hydraulic processes produced by storm events and related soil erosion and sediment transport processes at basin scale in lowland areas. The model simulates (i) storm runoff,(ii) soil detachment by raindrop impact and overland flow (gross sediment yield),(iii) sediment transport by overland flow and associated erosion-deposition processes and (iv) sediment transport by stream flow and riverbed erosion-deposition processes. A quasi two-dimensional representation of water flow and sediment transport routing is made by means of interconnected cells approach. The model is applied to simulate two flooding events in the Luduea Creek basin (Santa Fe, Argentina) occurred in April 1994 and March 2007 due to extraordinary rainfalls.

关键词： Mathematical modeling Erosion Sedimentation Ludue?a Creek Argentina

Toward molecular models of proton pumping：Challenges,methods and relevant applications

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

中国科学：化学 2012年第2期42卷 195-196页

作者： riccardi Demian ZHU Xiao GOYAL Puja YANG Shuo HOU GuanHua CUI Qiang Department of Chemistry and Theoretical Chemistry Institute University of Wisconsin Madison 1101 University Ave Madison W153706 USA

关键词：分子模型质子泵应用密度泛函理论生物分子跨膜蛋白远距离运输机械问题

维普期刊数据库

Portal vein thrombosis in cirrhosis: Why a well-known complication is still matter of debate

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2019年第31期25卷 4437-4451页

作者： Mariella Faccia Maria Elena Ainora Francesca Romana Ponziani Laura riccardi Matteo Garcovich Antonio Gasbarrini Maurizio Pompili Maria Assunta Zocco Department of Internal Medicine and Gastroenterology Fondazione Policlinico Universitario A.Gemelli IRCCSCatholic University

Portal vein thrombosis(PVT)represents a well-known complication during the natural course of liver cirrhosis(LC),ranging from asymptomatic cases to lifethreating conditions related to portal hypertension and hepatic *** flow stasis,complex acquired hypercoagulable disorders and exogenous factors leading to endothelial dysfunction have emerged as key factors for PVT ***,PVT occurrence remains unpredictable and many issues regarding its natural history,prognostic significance and treatment are still *** particular although spontaneous resolution or disease stability occur in most cases of PVT,factors predisposing to disease progression or recurrence after spontaneous recanalization are not clarified as ***,PVT impact on LC outcome is still debated,as PVT may represent itself a consequence of liver fibrosis and hepatic dysfunction *** and transjugular intrahepatic portosystemic shunt are considered safe and effective in this setting and are recommended in selected cases,even if the safer therapeutic option and the optimal therapy duration are still ***,their impact on mortality rates should be addressed more *** this review we present the most debated questions regarding PVT,whose answers should come from prospective cohort studies and large sample-size randomized trials.

关键词： Portal vein thrombosis Liver cirrhosis Hypercoagulability Anticoagulation Direct oral anticoagulants

Ethanol injection is highly effective for hepatocellular carcinoma smaller than 2cm

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2011年第26期17卷 3126-3132页

作者： Maurizio Pompili Erica Nicolardi Valeria Abbate Luca Miele Laura riccardi Marcello Covino Nicoletta De Matthaeis Antonio Grieco Raffaele Landolfi Gian Ludovico Rapaccini Department of Internal Medicine Università Cattolica del Sacro Cuore Department of Emergency Università Cattolica del Sacro Cuore

AIM： To analyze the long-term prognosis in a cohort of western cirrhotic patients with single hepatocellular carcinoma treated with ethanol injection.METHODS： One-hundred forty-eight patients with solitan/hepatocellular carcinoma were enrolled. The tumor diameter was lower than 2 cm in 47 patients but larger in the remaining 101 patients. The impact of some pre- treatment clinical and laboratory parameters and of tu- mor recurrence on patients＇ survival was assessed.RESULTS： Among the pre-treatment parameters, only a tumor diameter of less than 2 cm was an independent prognostic factor of survival. The occurrence of new nodules in other liver segments and the neoplastic portal invasion were linked to a poorer prognosis at univariate analysis. Patients with a single hepatocellular carcinoma smaller than 2 cm showed a better 5-year cumulative survival （73.0% vs 47.9%）（P = 0.009）, 3-year local re- currence rate （29.1% vs 51.5%）（P = 0.011）, and 5-year distant intrahepatic recurrence rate （52.g% vs 62.8%）（P = 0.054） compared to patients with a larger tumor. CONCLUSION： The 5-year survival rate of patients with single hepatocellular carcinoma 〈 2 cm undergoing ethanol injection is excellent and comparable to that achieved using radiofrequency ablation.

关键词： Hepatocellular carcinoma Cirrhosis Percutaneous ethanol injection Prognosis