检索结果-南通市图书馆

Collateral findings during computed tomography scan for atrial fibrillation ablation:Let's take a look around

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 Cardiology 2016年第4期8卷 310-316页

作者： Francesco Perna Michela Casella Maria Lucia Narducci Antonio Dello Russo Gianluigi Bencardino Gianluca Pontone Gemma Pelargonio daniele andreini Nicola Vitulano Francesca Pizzamiglio Edoardo Conte Filippo Crea Claudio Tondo Cardiac Arrhythmia Unit Agostino Gemelli University Hospital Cardiac Arrhythmia Research Centre Centro Cardiologico MonzinoIRCCS

The growing number of atrial fibrillation catheter ablation procedures warranted the development of advanced cardiac mapping techniques, such as image integration between electroanatomical map and cardiac computed tomography. While scanning the chest before catheter ablation, it is frequent to detect cardiac and extracardiac collateral findings. Most collateral findings are promptly recognized as benign and do not require further attention. However, sometimes clinically relevant collateral findings are detected, which often warrant extra diagnostic examinations or even invasive procedure, and sometimes need to be followed-up over time. Even though reporting and further investigating collateral findings has not shown a clear survival benefit, almost all the working groups providing data on collateral findings reported some collateral findings eventually coming out to be malignancies, sometimes at an early stage. Therefore, there is currently no clear agreement about the right strategy to be followed.

关键词： Collateral findings Incidental findings Incidentalomas Cardiac computed tomography Image integration

On the Proper Homotopy Invariance of the Tucker Property

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2007年第3期23卷 571-576页

作者： daniele Ettore OTERA Universitádi Palermo Dipartimento di Matematica ed Applicazionivia Archirafi 3490123-PalermoItaly and Université Paris-SudMathématiquesBt 42591405 Orsay Cedex-France

A non-compact polyhedron P is Tucker if, for any compact subset K begong to P, the fundamental group π1 （P - K） is finitely generated. The main result of this note is that a manifold which is proper homotopy equivalent to a Tucker polyhedron is Tucker. We use Poenaru＇s theory of the equivalence relations forced by the singularities of a non-degenerate simplicial map.

关键词： proper homotopy Φ/ψ-theory tucker property

A recursive implementation of the ALIENOR optimization method

在线全文

学校读者我要写书评

暂无评论

International Journal of Intelligent Computing and Cybernetics 2021年第2期14卷 81-103页

作者： daniele Peri National Research Council(CNR) Istituto per le Applicazioni del Calcolo“Mauro Picone”–IACRomaItaly

Purpose-A recursive scheme for the ALIENOR method is proposed as a remedy for the difficulties induced by the method.A progressive focusing on the most promising region,in combination with a variation of the density of the alpha-dense curve,is ***/methodology/approach-ALIENOR method is aimed at reducing the space dimensions of an optimization problem by spanning it by using a single alpha-dense curve:the curvilinear abscissa along the curve becomes the only design parameter for any design *** a counterpart,the transformation of the objective function in the projected space is much more difficult to ***-A fine tuning of the procedure has been performed in order to identity the correct balance between the different elements of the *** proposed approach has been tested by using a set of algebraic functions with up to 1,024 design variables,demonstrating the ability of the method in solving large scale optimization *** an industrial application is ***/value-In the knowledge of the author there is not a similar paper in the current literature.

关键词： ALIENOR optimization Global optimization Lipschitzian optimization Reduced order base

Evolution of turbulent boundary layer over a three-dimensional bump

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2022年第6期35卷 137-145页

作者： Jun LIU daniele FISCALETTI Huacheng YUAN College of Energy and Power Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China School of Civil Aerospace and Mechanical EngineeringUniversity of BristolBristol BS81TRUK

A bump is typically used in the inlet system of an aircraft engine to compress the incoming airflow and to reduce boundary layer thickness developed over *** this work,the turbulent flow over a three-dimensional bump is experimentally *** bump model is mounted in a closed return wind tunnel operated at the nominal velocity 10 m/s,corresponding to a friction Reynolds number of *** flow field upstream the bump,along the bump centerline and at two different spanwise planes is measured with Particle Image Velocimetry(PIV).It is observed that a favorable pressure gradient develops until the suction peak of the bump,and that the average turbulence intensity within boundary layer is attenuated due to this favorable pressure *** boundary layer thickness identified by examining profiles of streamwise velocity decreases significantly along the *** wall-normal position of the Turbulent/Non-Turbulent Interface(TNTI)identified with the vorticity criterion is also observed to decrease along the *** studying the behavior of the boundary layer thickness at different spanwise positions,we found that it tends to be larger in planes away from the centreline,which suggests that the bump diverts the flow.

关键词： Bump Divertless inlet Particle Image Velocimetry(PIV) Turbulent boundary layer Turbulent/Non-Turbulent Interface(TNTI)

Single-point and Filtered Relative Position Estimation for Visual Docking

在线全文

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2016年第2期111卷 147-169页

作者： Dylan Conway daniele Mortari Aerospace Engineering Texas A&M UniversityCollege Station77843

This paper presents a new method to estimate position from line-ofsight measurements to known targets when attitude is *** algorithm has two *** first produces a closed-form unbiased estimate for position that does not account for the measurement error *** second stage is iterative and produces an estimate of position that explicitly accounts for the measurement error covariance and the coupling between measurement error and sensor-to-target *** algorithm gives an accurate estimate of both position and the corresponding position error covariance and has a low computational *** computational complexity is O(n)for n point-targets and only a 3×3 linear system must be *** algorithm is demonstrated for single-point position estimation to verify the accuracy of the resulting position and *** improvements over current methods are shown through statistical *** algorithm is then demonstrated in the context of sequential filtering for space vehicle docking.

关键词： Visual point algorithm

Influence of Process Parameters and Sr Addition on the Microstructure and Casting Defects of LPDC A356 Alloy for Engine Blocks

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 Materials Science & Technology 2016年第6期32卷 515-523页

作者： Giulio Timelli daniele Caliari Jovid Rakhmonov Department of Management and Engineering University of PadovaStradeUa S.Nicola3 1-36100 VicenzaItaly

The effects of Sr addition and pressure increase on the microstructure and casting defects of a low-pressure die cast （LPDC） AISi7Mg0.3 alloy have been studied. Metallographic and image analysis techniques have been used to quantitatively examine the microstructural changes and the amount of porosity occurring at different Sr levels and pressure parameters. The results indicate that an increase in the filling pressure induces lower heat dissipation of the liquid close to the die/core surfaces, with the formation of slightly greater dendrite arms and coarser eutectic Si particles. On the other hand, the increase in the Sr level leads to finer microstructural scale and eutectic Si. The analysed variables, within the experimental conditions, do not affect the morphology of eutectic Si particles. Higher applied pressure and Sr content generate castings with lower amount of porosiW. However, as the filling pressure increases the flow of metal inside the die cavity is more turbulent, leading to the formation of oxide films and cold shots. In the analysed range of experimental conditions, the design of experiment methodology and the analysis of variance have been used to develop statistical models that accurately predict the average size of secondary dendrite arm spacing and the amount of porosity in the low-pressure die cast AISiTMg0.3 alloy.

关键词： Aluminium alloys Engine block Microstructure Casting defects Sr addition Process parameters

On “Over-Sized” High-Gain Practical Observers for Nonlinear Systems

在线全文

学校读者我要写书评

暂无评论

IEEE/CAA Journal of Automatica Sinica 2018年第3期5卷 691-698页

作者： daniele Carnevale Corrado Possieri Antonio Tornambè Dipartimento di Ingegneria Civile e Ingegneria Informatica Universita di Roma Tor Vergata

In this paper,it is shown that the performances of a class of high-gain practical observers can be improved by estimating the time derivatives of the output up to an order that is greater than the dimension of the system, which is assumed to be in observability form and, possibly, time-varying. Such an improvement is achieved without increasing the gain of the observers, thus allowing their use in a wide variety of control and identification applications.

关键词： Filtering properties nonlinear systems observability observer design

Geomechanical design of a room and rib pillar granite mine

在线全文

学校读者我要写书评

暂无评论

Journal of University of Science and Technology Beijing 2008年第2期15卷 97-103页

作者： daniele Peila Claudia Guardini Sebastiano Pelizza Tunnelling Underground Space Center Department of EnvironmentLand and Geotechnology Engineering Politecnico di Torino Tunnelling Underground Space Center Department of EnvironmentLand and Geotechnology EngineeringPolitecnico di TorinoTorinoItaly

The geomechanical and stability design of an underground granite mine located in Canal San Bovo （Trento district, Northeastern Italy） was described. The exploitation of the granite, which is used in the ceramic industry, was carried out by the rooms and rib pillars method. The rooms are 12 m wide while the pillars are 11 m wide and they cross the main discontinuity set of the rock mass in the perpendicular direction. To verify the stability condition of an underground mine, it is necessary to carry out the calcula- tions that are able to check both the local and global stability of the rock mass. In the studied example, this approach has been applied with the development of analytical and numerical parametric analyses and it has permitted to get the best orientation and to design the size of rooms and pillars.

关键词： mining room and pillar rock mechanics stability analysis

CUBE, a Cable-driven Device for Limb Rehabilitation

在线全文

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2019年第3期16卷 492-502页

作者： daniele Cafolla Matteo Russo Giuseppe Carbone IRCCS Neuromed Via delFelettronica 86077 Pozzilli IS Italy University of Nottingham Advanced Manufacturing Building C47 Nottingham NG8 IBB UK DIMEG University of Calabria Via Bucci Cubo 46C 87036 Rende Italy CESTER Technical University of Cluj-Napoca MunciiAve. 103-105 400641 Cluj-Napoca Romania

In this paper, a novel cable-driven parallel robot, CUBE, is introduced for the assistance of patients in rehabilitation exercising of both upper and lower limbs. The system is characterized by a lightweight structure that is easy to set-up and operate, for both clinical and home usage for both pre-determined and customized exercises, with control over the position of the end-effector while locking its rotation around the horizontal axes. Its cable-driven design makes it inherently safe in human/robot interactions also due to the extremely low inertia. While a novel end-effector design makes the device wearable both on the upper and lower limbs without having to disassemble any part of the structure. The design is presented with its kinematic analysis. Then, the manufacturing through 3D?printing and commercial components of a first prototype is reported. Finally, the system is validated through motion tests along simple trajectories and two different spatial exercises.

关键词： cable-driven robots medical robots parallel robots rehabilitation devices