Essays about: "saddle point"

Showing result 1 - 5 of 10 essays containing the words saddle point.

  1. 1. A theoretical study of longitudinal and transverse spin fluctuations in disordered Fe64Ni36 alloys

    University essay from Linköpings universitet/Teoretisk Fysik

    Author : Amanda Ehn; [2020]
    Keywords : INVAR effect; longitudinal spin fluctuations; transversal spin fluctuations;

    Abstract : That certain iron and nickel alloys exhibit an anomalously low thermal expansion of a wide temperature range has been observed since late 1800s, and this effect is known as the Invar effect. Since then, many theories have been proposed to explain the phenomenon. READ MORE

  3. 2. Preconditioned iterative methods for PDE-constrained optimization problems with pointwise state constraints

    University essay from Uppsala universitet/Avdelningen för beräkningsvetenskap

    Author : Anders Ström; [2017]
    Keywords : ;

    Abstract : Optimization problems constrained by partial differential equations (PDEs) arise in a variety of fields when one wants to optimize a system governed by a PDE. The goal is to compute a control variable such that a state variable is as close as possible to some desired state when control and state are coupled by some PDE. READ MORE

  4. 3. Performance comparisons of preconditioned iterative methods for problems arising in PDE-constrained optimization

    University essay from Uppsala universitet/Institutionen för informationsteknologi

    Author : Shiraz Farouq; [2015]
    Keywords : ;

    Abstract : The governing dynamics of simple and complex processes, whether physical, biological, social, economic, engineering, or even rather a mere figment of imagination, can be studied via numerical simulations of mathematical models. These models in many cases can be thought to consist of one, or frequently, several coupled partial differential equations (PDEs). READ MORE

  5. 4. Paleoenvironment and shore displacement since 3200 BC in the central part of the  Långhundraleden Trail, SE Uppland

    University essay from Institutionen för naturgeografi och kvartärgeologi (INK)

    Author : Christos Katrantsiotis; [2013]
    Keywords : Shore displacement; isostatic variability; Uppland; saddle-point; paleoenvironment;

    Abstract : In this study, litho-, bio- and chronostratigraphic investigations combined with RTK GPSleveling have been carried out to reconstruct the paleoenvironment in the central part of theLånghundraleden Trail. The area displays four shallow lake basins of varyingmorphologies. The basins are now covered with peat as a result of infilling and overgrowth. READ MORE

  6. 5. Numerical methods for glacial isostatic adjustment  models

    University essay from Institutionen för informationsteknologi

    Author : Juan Carlos Araujo-Cabarcas; [2013]
    Keywords : ;

    Abstract : Nordic countries experience post-glacial rebound, a movement where geographical contours slowly change elevation with respect to the mean sea level. The glacial isostatic adjustment (GIA) model aims to explain the phenomena, which combined with seismic data allows geoscientists to reconstruct elastic coefficients and viscosities of the Earth's lithosphere and upper mantle. READ MORE