Publications related to Linear and non-linear studies of spurious backward-wave instabilities in a smooth-wall gyrotron beam duct

Optimum Truss Design with Reused Stock Elements

Corentin Jean Dominique Fivet, Gennaro Senatore, Jan Friedrich Georg Brütting, Joseph Jean François Desruelle

This paper proposes the application of optimization techniques to design reticular structures made from a stock of reused elements. Still little explored, the reuse of structural components over multiple service lives has the potential to reduce the enviro ...

2018

A Review and Mathematical Treatment of Infinity on the Smith Chart, 3D Smith Chart and Hyperbolic Smith Chart

Mihai Adrian Ionescu, Andrei Müller

This work describes the geometry behind the Smith chart, recent 3D Smith chart tool and previously reported conceptual Hyperbolic Smith chart. We present the geometrical properties of the transformations used in creating them by means of inversive geometry ...

MDPI2018

An isogeometric boundary element method for electromagnetic scattering with compatible B-spline discretizations

Rafael Vazquez Hernandez

We outline the construction of compatible B-splines on 3D surfaces that satisfy the continuity requirements for electromagnetic scattering analysis with the boundary element method (method of moments). Our approach makes use of Non-Uniform Rational B-splin ...

2018

On some algebraic and extremal problems in discrete geometry

Seyed Hossein Nassajianmojarrad

In the present thesis, we delve into different extremal and algebraic problems arising from combinatorial geometry. Specifically, we consider the following problems. For any integer

n\ge 3

, we define

e(n)

to be the minimum positive integer such that an ...

EPFL2017

Novel linear analysis for a gyrotron oscillator based on a spectral approach

Stefano Alberti, Minh Quang Tran, Jean-Philippe Hogge, Jérémy Genoud, Trach-Minh Tran

With the aim of gaining a better physical insight into linear regimes in gyrotrons, a new linear model was developed. This model is based on a spectral approach for solving the self-consistent system of equations describing the wave-particle interaction in ...

2016

Study of the Misalignment Between Electromagnetic Fields Interacting with Rb Atoms in a Cavity with Losses

Anton Evgeniev Ivanov

In this study we investigate the impact of misalignment of the static and/or microwave magnetic fields from the laser propagation direction. Our analysis is suitable to reveal how the geometry of the cavity and the losses influence the resonance transition ...

2016

Effect of geometry modifications on the engulfment in micromixers: Numerical simulations and stability analysis

Andrea Fani, Lorenzo Siconolfi

The effect of geometry variations on the engulfment regime in micromixers is investigated. The engulfment regime is a steady flow regime resulting from a symmetry-breaking pitchfork bifurcation as the Reynolds number (based on the hydraulic diameter and bu ...

Elsevier2016

Moment-based, self-consistent linear analysis of gyrotron oscillators

Stefano Alberti, Minh Quang Tran, Jean-Philippe Hogge, Trach-Minh Tran

A new model for simulating gyrotron oscillators in the monomode time-dependent linear self-consistent regime is presented. Starting from a nonlinear time-dependent monomode model, the linearization and the following simplification of the model, based on a ...

Amer Inst Physics2014

Pairwise summation approximation for Casimir potentials and its limitations

Anne-Florence Raphaëlle Bitbol

We investigate the error made by the pairwise summation (PWS) approximation in three geometries where the exact formula for the Casimir interaction is known: atom-slab, slab-slab, and sphere-slab configurations. For each case, the interactions are calculat ...

American Physical Society (APS)2013

Geometric Variational Models for Inverse Problems in Imaging

Virginia Estellers Casas

This dissertation develops geometric variational models for different inverse problems in imaging that are ill-posed, designing at the same time efficient numerical algorithms to compute their solutions. Variational methods solve inverse problems by the fo ...

EPFL2013

Linear and non-linear studies of spurious backward-wave instabilities in a smooth-wall gyrotron beam duct

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Optimum Truss Design with Reused Stock Elements

A Review and Mathematical Treatment of Infinity on the Smith Chart, 3D Smith Chart and Hyperbolic Smith Chart

An isogeometric boundary element method for electromagnetic scattering with compatible B-spline discretizations

On some algebraic and extremal problems in discrete geometry

Novel linear analysis for a gyrotron oscillator based on a spectral approach

Study of the Misalignment Between Electromagnetic Fields Interacting with Rb Atoms in a Cavity with Losses

Effect of geometry modifications on the engulfment in micromixers: Numerical simulations and stability analysis

Moment-based, self-consistent linear analysis of gyrotron oscillators

Pairwise summation approximation for Casimir potentials and its limitations

Geometric Variational Models for Inverse Problems in Imaging

Optimum Truss Design with Reused Stock Elements

On some algebraic and extremal problems in discrete geometry

A Review and Mathematical Treatment of Infinity on the Smith Chart, 3D Smith Chart and Hyperbolic Smith Chart

Effect of geometry modifications on the engulfment in micromixers: Numerical simulations and stability analysis

Novel linear analysis for a gyrotron oscillator based on a spectral approach

Study of the Misalignment Between Electromagnetic Fields Interacting with Rb Atoms in a Cavity with Losses

An isogeometric boundary element method for electromagnetic scattering with compatible B-spline discretizations

Moment-based, self-consistent linear analysis of gyrotron oscillators

Pairwise summation approximation for Casimir potentials and its limitations

Geometric Variational Models for Inverse Problems in Imaging