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Computer Modeling in Engineering & Sciences 2023年第8期136卷 1371-1397页

作者： Rafael Marin Ferro renato pavanello Coordination of Mechanical Engineering Federal Institute of Science and Technology of ES-IFESAracruz-ES29192-733Brazil Department of Computational Mechanics Faculty of Mechanical EngineeringUnicampCampinas-SP13083-860Brazil

This work analyzes the implementation of a continuous method of structural topology optimization(STO)using open-source software for all stages of the topology optimization problem:modeling,sensitivity analysis and *** implementation involves three main components:numerical analysis using the Finite Element Method(FEM),sensitivity analysis using an Adjoint method and an optimization *** order to allow the automated numerical solution of Partial Differential Equations(PDEs)and perform a sensitivity analysis,FEniCS and Dolfin Adjoint software are used as tools,which are open-source *** the optimization process,Ipopt(Interior Point OPTimizer)is used,which is a software package for nonlinear optimization scale designed to find(local)solutions of mathematical optimization *** topological optimization method used is based on the SIMP-Solid IsotropicMaterial with Penalization *** considered problem is the minimization of compliance/maximization of stiffness,considering the examples of recurrent structures in the literature in 2D and 3D.A density filtering algorithm based on Helmholtz formulation is *** complete code involves 51 lines of programming and is presented and commented in detail in this article.

关键词： Structural topology optimization finite element method FEniCS Dolfin Adjoint

Characteristics of different charge transfer modes in upward flashes inferred from simultaneously measured currents and fields

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High Voltage 2020年第1期5卷 30-37页

作者： Lixia He Mohammad Azadifar Quanxin Li Marcos Rubinstein Vladimir A.Rakov Arturo Mediano Davide pavanello Farhad Rachidi Electromagnetic Compatibility Laboratory Swiss Federal Institute of Technology(EPFL)1015 LausanneSwitzerland Department of Atmospheric Physics Nanjing University of Information Science and TechnologyNanjingPeople's Republic of China University of Applied Sciences of Western Switzerland(HES-SO) 1400 Yverdon-les-BainsSwitzerland Department of Electrical Engineering Wuhan UniversityWuhanPeople's Republic of China Department of Electrical and Computer Engineering University of FloridaFloridaUSA Institute of Electronics and Mathematics National Research University Higher School of EconomicsMoscowRussia Department Electronics and Communication Engineering University of ZaragozaZaragozaSpain Institute of Sustainable Energy University of Applied Sciences of Western Switzerland(HES-SO)1950 SionSwitzerland

The authors present an analysis of different charge transfer modes during upward negative *** analysis includes a total number of 94 pulses that occurred during two upward negative flashes recorded at the Säntis *** pulses included 59 mixed-mode(MM)initial continuous current(ICC)pulses,17 M-component-type ICC(M-ICC)pulses,8 returnstroke pulses,and 10 classical M-component(MC)*** is found that the initial stage of the flash is responsible for the largest share of the total charge transferred to the *** results for the electric fields associated with the considered charge transfer modes are presented and *** stroke(RS)and MM pulses were simulated adopting the MTLE model,while MCs and M-ICC pulses were simulated using the guided wave model of Rakov et *** simulated results are shown to be in good agreement with simultaneous records of electric fields measured at a distance of 15 km from the Säntis *** inferred velocities for MCs and M-ICC pulses range from 2.0×10^(7) to 9.0×10^(7) m/s,and the corresponding junction point heights range from 1.0 to 2.0 *** inferred pulse velocities for RSs and MM pulses range from 1.3×10^(8) to 1.65×10^(8) m/*** inferred current attenuation constants of the MTLE model obtained in this study range from 0.3 to 0.8 km,lower than the value of 2 km previously suggested for RSs in downward *** obtained results support the assumption that the mode of charge transfer to the ground giving rise to MM pulses is similar to that of *** results are also in support of the generally assumed similarity between M-ICC pulses and classical MCs.

关键词： flash charge transfer

Influence of Phosphoric Acid Etching on the Bond Strength of a Universal Adhesive System to Caries-Affected Dentin

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Advances in Biological Chemistry 2018年第3期8卷 37-46页

作者： Renata pavanello Sérgio Luiz Pinheiro Health Sciences Pontifícia Universidade Católica de Campinas (PUC-Campinas) Campinas Brazil Master’s Program in Health Sciences School of Dentistry PUC-Campinas Campinas Brazil

The purpose of this study was to evaluate the influence of acid etching on the bond strength of a universal adhesive system (Single Bond Universal, 3M) to caries-affected dentin. Forty permanent third molars were selected and carious lesions were induced by the microbiological method with?S. mutans?ATCC25175. Teeth were allocated randomly across four experimental designs (n?=?10): PA-I: phosphoric acid etching and application of the adhesive system, followed by immediate microtensile bond strength testing;PA-CC: phosphoric acid etching and application of the adhesive system, followed by microtensile bond strength testing after a 14-day cariogenic challenge;NPA-I: application of the adhesive system without acid etching, followed by immediate bond strength testing and NPA-CC: application of the adhesive system without acid etching followed by bond strength testing after 14-day cariogenic challenge. For microtensile bond strength testing,?a restoration with Charisma composite resin was made and each specimen was sectioned with a cross-sectional area of 1 mm2. Only adhesive and mixed fractures were considered for bond strength calculation. Results were evaluated by the Kruskal-Wallis and Friedman tests. The highest bond strengths were observed in the phosphoric acid etching groups (p??0.05). Cariogenic challenge did not affect bond strength (p?>?0.05). The predominant fracture type was adhesive. We conclude that phosphoric acid increased the bond strength of the Single Bond Universal system to caries-affected dentin, and that cariogenic challenge did not interfere with this bond strength.

关键词： Caries-Affected Dentin Universal Adhesives Hybrid Layer Collagen Fibers Microtensile Bond Strength

Geomatic and Geotechnical Monitoring of Settlements in the Venice Lagoon, Italy

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Journal of Civil Engineering and Architecture 2014年第3期8卷 276-288页

作者： Achilli Vladimiro Carrubba Paolo Fabris Massimo Menin Andrea pavanello Paolo Department of Civil Environmental and Architectural Engineering (ICEA) The University of Padua Padua 35131 Italy

The safeguarding of Venice and the Venetian lagoon （Italy） from rising water is of great national interest. Besides the normal tidal regime, the effects of an increase in the frequency and intensity of floods in the lagoon have been accentuated by a reduction in the elevation of the land in respect to the actual average sea level. With the aim of reducing the vulnerability of the lagoon, the Italian Ministry of University and Scientific and Technological Research financed the research project ＂The geotechnical model of the subsurface for the safeguarding of Venice and its lagoon＂, to study the compressibility of the lagoon deposits, both by natural causes and as a consequence of overloading with heavy structures. The project involved the construction of a large experimental embankment in the Treporti area of the lagoon, in order to perform a full-scale long-term compression test on the lagoon soils. By using various geomatic and geotechnical monitoring techniques, it was possible to appraise very small vertical movements of the ground induced by the compressibility of the highly heterogeneous silty formations. High-precision data was acquired by means of classical topographic methodologies integrated with continuous GPS （Global Positioning System） measurements. In addition, vertical displacements of the ground were obtained using geotechnical instrumentation. This cross-monitoring approach provided a valuable tool for analyzing both the natural and anthropic causes of settlement.

关键词： Foundation settlement Venice lagoon levelling GPS.

将光子学与硅基纳米电子学相结合,用于下一代片上系统

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家电科技 2018年第5期 6-6页

作者： Amir H. Alabaki Sajjad Moazeni Fabio pavanello Hayk Gevorgyan 刘斐莹

电子和光子学技术改变了我们的生活——从计算和移动设备到信息技术和互联网。未来,我们在这些领域的需求,不仅依赖于对每种技术的单独创新,也取决于我们通过集成解决方案利用其互补物理特性的能力。

关键词：纳米电子学光子学技术片上系统硅基集成解决方案信息技术移动设备物理特性