Articles

Low-field electron mobility evaluation in silicon nanowire transistors using an extended hydrodynamic model

Silicon nanowires (SiNWs) are quasi-one-dimensional structures in which electrons are spatially confined in two directions and they are free to move in the orthogonal direction. The subband decomposition and t...

Authors: Orazio Muscato, Tina Castiglione, Vincenza Di Stefano and Armando Coco

Shape design for polymer spin packs: modeling, optimization and validation

A shape optimization approach for the design of cavities with a specified wall shear stress profile is presented. Applications are the design of spin pack geometries with low and uniform residence times and wi...

Authors: Christian Leithäuser, René Pinnau and Robert Feßler

Nanoelectronic COupled Problems Solutions: uncertainty quantification for analysis and optimization of an RFIC interference problem

The FP7 project nanoCOPS (the 7th Framework Programme project Nanoelectronic COupled Problems Solutions) derived new methods for simulation during development of designs of integrated products. It has covered ...

Authors: Piotr Putek, Rick Janssen, Jan Niehof, E. Jan W. ter Maten, Roland Pulch, Bratislav Tasić and Michael Günther

Hybrid importance sampling Monte Carlo approach for yield estimation in circuit design

The dimension of transistors shrinks with each new technology developed in the semiconductor industry. The extreme scaling of transistors introduces important statistical variations in their process parameters...

Authors: Anuj K. Tyagi, Xavier Jonsson, Theo G. J. Beelen and Wil H. A. Schilders

Characterization of steel buildings by means of non-destructive testing methods

Non-destructive testing methods became popular within the last few years. For steel beams incorporated in buildings there are currently only destructive ways for testing the yield limit as well as for determin...

Authors: Markus Sebastian Doktor, Christian Fox, Wolfgang Kurz and Jean-Pierre Stockis

Convergence of an explicit iterative leap-frog discontinuous Galerkin method for time-domain Maxwell’s equations in anisotropic materials

We propose an explicit iterative leap-frog discontinuous Galerkin method for time-domain Maxwell’s equations in anisotropic materials and derive its convergence properties. The a priori error estimates are illust...

Authors: Adérito Araújo, Sílvia Barbeiro and Maryam Khaksar Ghalati

Finite element methods on composite meshes for tuning plasma equilibria in tokamaks

The fundamental concept of magnetically confined nuclear fusion devices is the magnetohydrodynamic (MHD) equilibrium: the pressure gradient due to highly energetic charged particles is balanced by the Lorenz f...

Authors: Holger Heumann, Francesca Rapetti and Xiao Song

Semiparametric prediction models for variables related with energy production

In this paper a review of semiparametric models developed throughout the years thanks to an extensive collaboration between the Department of Statistics and Operations Research of the University of Santiago de...

Authors: Wenceslao González-Manteiga, Manuel Febrero-Bande and María Piñeiro-Lamas

Ray mappings and the weighted least action principle

Two basic problems in optics are presented. The solutions to both problems are formulated in terms of the associated ray mappings. An alternative formulation based on a weighted sum of the actions along the ra...

Authors: Jacob Rubinstein, Gershon Wolansky and Yifat Weinberg

Uncertainty quantification and Heston model

In this paper, we study the impact of the parameters involved in Heston model by means of Uncertainty Quantification. The Stochastic Collocation Method already used for example in computational fluid dynamics,...

Authors: María Suárez-Taboada, Jeroen A. S. Witteveen, Lech A. Grzelak and Cornelis W. Oosterlee

Modelling and optimization applied to the design of fast hydrodynamic focusing microfluidic mixer for protein folding

In this work, we consider a microfluidic mixer that uses hydrodynamic diffusion stream to induce the beginning of the folding process of a certain protein. To perform these molecular changes, the concentration...

Authors: Benjamin Ivorra, Miriam R. Ferrández, María Crespo, Juana L. Redondo, Pilar M. Ortigosa, Juan G. Santiago and Ángel M. Ramos

Assessment of self-adapting local projection-based solvers for laminar and turbulent industrial flows

In this work, we study the performance of some local projection-based solvers in the Large Eddy Simulation (LES) of laminar and turbulent flows governed by the incompressible Navier–Stokes Equations (NSE). On ...

Authors: Tomás Chacón Rebollo, Enrique Delgado Ávila, Macarena Gómez Mármol and Samuele Rubino

Optimal logistics strategy to distribute medicines in clinics and hospitals

This document presents a methodology for the optimal selection of the vehicle fleet necessary to distribute medical products from the company’s storage center to many intermediate transfer nodes, and from thes...

Authors: Gilberto Pérez Lechuga

Reduced basis method applied to a convective stability problem

Numerical reduced basis methods are instrumental to solve parameter dependent partial differential equations problems in case of many queries. Bifurcation and instability problems have these characteristics as...

Authors: Henar Herrero, Yvon Maday and Francisco Pla

A holistic fast and parallel approach for accurate transient simulations of analog circuits

The accurate analog simulation of critical circuit parts is a key task in the R&D process of integrated circuits. With the increasing complexity of integrated circuits it is becoming cumulatively challenging t...

Authors: Janos Benk, Georg Denk and Konrad Waldherr

Maximum total welfare versus growth of R&D networks

The aim of this paper is to explore the characteristics of symmetric R&D networks that generate the highest overall welfare in a setting where spillovers between non-cooperating firms are ignored. The relation...

Authors: Mohamad Alghamdi

Numerical methods to simulate moisture dynamics in fibrous sheet

Comprehension of moisture dynamics in fibrous sheets is indispensable in a wide variety of industrial areas. This paper proposes a practical mathematical model, which is referred to as the 2-D extended porous ...

Authors: Hidekazu Yoshioka, Kotaro Fukada and Ichiro Kita

A computational method for key-performance-indicator-based parameter identification of industrial manipulators

We present a novel derivative-based parameter identification method to improve the precision at the tool center point of an industrial manipulator. The tool center point is directly considered in the optimizat...

Authors: Felix Jost, Manuel Kudruss, Stefan Körkel and Sebastian F Walter

Stochastic optimization model of aquacultured fish for sale and ecological education

A stochastic optimization model for management of aquacultured fish for sale and ecological education is established. Population dynamics of the fish is described with a system of stochastic differential equat...

Authors: Hidekazu Yoshioka and Yuta Yaegashi

A soft sensor for the Bayer process

A soft sensor for measuring product quality in the Bayer process has been developed. The soft sensor uses a combination of historical process data recorded from online sensors and laboratory measurements to pr...

Authors: Vincent Cregan, William T Lee and Louise Clune

Reconstruction of annular bi-layered media in cylindrical waveguide section

We consider a radial transverse resonance model for a circular cylindrical waveguide composed into two layers with different frequency dependent complex dielectric constants. An inverse problem with four unkno...

Authors: Anders Eriksson, Larisa Beilina and Truls Martin Larsen

Novel approaches to the energy load unbalance forecasting in the Italian electricity market

In the present paper we study the statistical properties of the Italian daily electricity load market, by mean of different statistical methods, such, e.g., the exponential smoothing model, the ARMA-ARIMA model a...

Authors: Luca Di Persio, Alessandro Cecchin and Francesco Cordoni

Aerodynamic web forming: process simulation and material properties

In this paper we present a chain of mathematical models that enables the numerical simulation of the airlay process and the investigation of the resulting nonwoven material by means of virtual tensile strength...

Authors: Simone Gramsch, Axel Klar, Günter Leugering, Nicole Marheineke, Christian Nessler, Christoph Strohmeyer and Raimund Wegener

A germ-grain model applied to the morphological study of dual phase steel

The mechanical properties of dual Phase steels (DP steels) are strictly related to the spatial distribution and the geometry of the two phases composing the steel, ferrite and martensite. Due to the high costs...

Authors: Alessandra Micheletti, Junichi Nakagawa, Alessio A Alessi, Daniela Morale and Elena Villa

Parametric modeling and model order reduction for (electro-)thermal analysis of nanoelectronic structures

In this work, we discuss the parametric modeling for the (electro)-thermal analysis of components of nanoelectronic structures and automatic model order reduction of the consequent parametric models. Given the...

Authors: Lihong Feng, Yao Yue, Nicodemus Banagaaya, Peter Meuris, Wim Schoenmaker and Peter Benner

Shape and topology optimization of a permanent-magnet machine under uncertainties

Our ultimate goal is a topology optimization for a permanent-magnet (PM) machine, while including material uncertainties. The uncertainties in the output data are, e.g., due to measurement errors in the non-/l...

Authors: Piotr Putek, Roland Pulch, Andreas Bartel, E Jan W ter Maten, Michael Günther and Konstanty M Gawrylczyk

Mathematical assessment of drug build-up in the posterior eye following transscleral delivery

Delivery of drugs to the posterior segment of the eye is a significant challenge in the field of opthalmic pharmaceuticals. Several restrictive barriers hinder drug delivery to this district. Static barriers i...

Authors: Paola Causin and Francesca Malgaroli

A nonmonotone flexible filter method for nonlinear constrained optimization

In this paper, we present a flexible nonmonotone filter method for solving nonlinear constrained optimization problems which are common models in industry. This new method has more flexibility for the acceptan...

Authors: Ke Su, Xiaochuan Li and Ruyue Hou

Charge transport and mobility in monolayer graphene

For electron devices that make use of innovative materials, a basic step in the development of models and simulation computer aided design (CAD) tools is the determination of the mobility curves for the charge...

Authors: Armando Majorana, Giovanni Mascali and Vittorio Romano

Nanoelectronic COupled problems solutions - nanoCOPS: modelling, multirate, model order reduction, uncertainty quantification, fast fault simulation

The FP7 project nanoCOPS derives new methods for simulation during development of designs of integrated products. It covers advanced simulation techniques for electromagnetics with feedback couplings to electr...

Authors: E Jan W ter Maten, Piotr A Putek, Michael Günther, Roland Pulch, Caren Tischendorf, Christian Strohm, Wim Schoenmaker, Peter Meuris, Bart De Smedt, Peter Benner, Lihong Feng, Nicodemus Banagaaya, Yao Yue, Rick Janssen, Jos J Dohmen, Bratislav Tasić…

Coffee extraction kinetics in a well mixed system

The extraction of coffee solubles from roasted and ground coffee is a complex operation, the understanding of which is key to the brewing of high quality coffee. This complexity stems from the fact that brewin...

Authors: Kevin M Moroney, William T Lee, Stephen BG O’Brien, Freek Suijver and Johan Marra

Chaos-based true random number generators

Random number (bit) generators are crucial to secure communications, data transfer and storage, and electronic transactions, to carry out stochastic simulations and to many other applications. As software gene...

Authors: Luis L Bonilla, Mariano Alvaro and Manuel Carretero

Uncertainty quantification in tsunami modeling using multi-level Monte Carlo finite volume method

Shallow-water type models are commonly used in tsunami simulations. These models contain uncertain parameters like the ratio of densities of layers, friction coefficient, fault deformation, etc. These paramete...

Authors: Carlos Sánchez-Linares, Marc de la Asunción, Manuel J Castro, José M González-Vida, Jorge Macías and Siddhartha Mishra

A hydro-geophysical simulator for fluid and mechanical processes in volcanic areas

Efficient and accurate hydrothermal and mechanical mathematical models in porous media constitute a fundamental tool for improving the understanding of the subsurface dynamics in volcanic areas. We propose a f...

Authors: Armando Coco, Gilda Currenti, Joachim Gottsmann, Giovanni Russo and Ciro Del Negro

Hydrodynamic equations for an electron gas in graphene

In this paper we review, and extend to the non-isothermal case, some results concerning the application of the maximum entropy closure technique to the derivation of hydrodynamic equations for particles with s...

Authors: Luigi Barletti

An a priori error estimate for interior penalty discretizations of the Curl-Curl operator on non-conforming meshes

We prove an a-priori error estimate for regularized Curl-Curl Problems which are discretized by the Interior Penalty/Nitsche’s Method on meshes non-conforming across interfaces. It is shown that the total erro...

Authors: Raffael Casagrande, Ralf Hiptmair and Joerg Ostrowski

Analytic solutions of a simple advection-diffusion model of an oxygen transfer device

Artificial blood oxygenation is an essential aspect of cardiopulmonary bypass surgery, maintaining physiological levels of oxygen and carbon dioxide in the blood, and thus temporarily replacing the normal func...

Authors: Sean McKee, Ewan A Dougall and Nigel J Mottram

Modelling stochastic correlation

This work deals with the stochastic modelling of correlation in finance. It is well known that the correlation between financial products, financial institutions, e.g., plays an essential role in pricing and e...

Authors: Long Teng, Matthias Ehrhardt and Michael Günther

Singular Value Homogenization: a simple preconditioning technique for linearly constrained optimization and its potential applications in medical therapy

A wealth of problems occurring naturally in the applied sciences can be reformulated as optimization tasks whose argument is constrained to the solution set of a system of linear equations. Solving these effic...

Authors: Dan-Daniel Erdmann-Pham, Aviv Gibali, Karl-Heinz Küfer and Philipp Süss

Three-axes error modeling based on second order dual numbers

The aim of the paper is to employ the dual numbers in the multi axes machine error modelling in order to apply the algebraic methods in computations. The calculus of higher order dual numbers allows us to calc...

Authors: Michal Holub, Jaroslav Hrdina, Petr Vašík and Jan Vetiška

3D finite element modeling and simulation of industrial semiconductor devices including impact ionization

In this article we address the numerical study of 3D semiconductor devices for applications in electronics industry including charge generation phenomena due to impact ionization. With this aim, we propose two...

Authors: Aurelio Mauri, Andrea Bortolossi, Giovanni Novielli and Riccardo Sacco

Mathematics in paper - from fiber suspension fluid dynamics to solid state paper mechanics

In papermaking process the base paper is formed by starting from low concentration suspension. Depending on process stage different models can be utilized for better understanding and performance of the proces...

Authors: Jari Hämäläinen, Taija Hämäläinen, Teemu Leppänen, Heidi Niskanen and Joonas Sorvari

Simulation of floating potentials in industrial applications by boundary element methods

We consider the electrostatic field computations with floating potentials in a multi-dielectric setting. A floating potential is an unknown equipotential value associated with an isolated perfect electric cond...

Authors: Dominic Amann, Andreas Blaszczyk, Günther Of and Olaf Steinbach

Simultaneous estimation of mass and aerodynamic rotor imbalances for wind turbines

The safe operation of wind turbines requires a well-balanced rotor. The balancing of the rotor requires a method to determine its imbalances. We propose an algorithm for the reconstruction of two types of imba...

Authors: Jenny Niebsch and Ronny Ramlau

Continuum mathematics at the nanoscale

In this paper we discuss three examples where continuum theory may be applied to describe nanoscale phenomena:

Authors: Tim G Myers, Michelle M MacDevette, Francesc Font and Vincent Cregan

Parallel solutions of static Hamilton-Jacobi equations for simulations of geological folds

Two new algorithms for numerical solution of static Hamilton-Jacobi equations are presented. These algorithms are designed to work efficiently on different parallel computing architectures, and numerical resul...

Authors: Tor Gillberg, Are Magnus Bruaset, Øyvind Hjelle and Mohammed Sourouri

Preface

Authors: Magnus Fontes and Michael Günther

On simulations of spinning processes with a stationary one-dimensional upper convected Maxwell model

This work deals with the behavior of viscoelastic jets under gravitational forces described by an asymptotic upper convected Maxwell (UCM) model, system of partial differential equations. Considering fiber spi...

Authors: Maike Lorenz, Nicole Marheineke and Raimund Wegener

Simulation of a highly elastic structure interacting with a two-phase flow

The aim of this paper is to present and validate a modeling framework that can be used for simulation of industrial applications involving fluid structure interaction with large deformations.

Authors: Erik Svenning, Andreas Mark and Fredrik Edelvik

Numerical approach for airframe assembly simulation

The paper describes the methodology of contact problem solving that is used for simulation of aircraft assembly process.

Authors: Margarita V Petukhova, Sergey V Lupuleac, Yulia K Shinder, Alexander B Smirnov, Sergey A Yakunin and Bertrand Bretagnol