Oscillation of adaptative Metropolis-Hasting and simulated annealing algorithms around penalized least squares estimator

In this work we study, as the temperature goes to zero, the oscillation of Metropolis-Hasting's algorithm around the Basis Pursuit De-noising solutions. We derive new criteria for choosing the proposal distribution and the temperature in Metropolis-Hasting's algorithm. Finally we apply these results to compare Metropolis-Hasting's and simulated annealing algorithms

Students' Perception on Careers as Chartered Accountants

This study aims to investigate the factors that impact on student's intentions to their career choice. A questionnaire-based survey was administered to both accounting students in Universiti Utara Malaysia (UUM) at the undergraduate and postgraduate level. The results show that four factors (Perceptions, Level of Interest in Accounting, Intrinsic and Extrinsic, Major Human Influencers or Referents) are determinants of students' career

Investigation of Combined Effects of Xanthan Gum,Sodium Dodecyl Sulphate, and Salt on Some Physicochemical Properties of Their Mixtures Using a Response Surface Method

Aqueous solutions containing sodium dodecyl sulphate, xanthan gum, and salt were characterized by ionic conductivity, viscosity, and surface tension methods. A preliminary experimental study was performed to evaluate the effect of the mixture compositions on the surface behavior of the mixed polymer/surfactant systems under different solution conditions. An experimental design using response surface method (RSM) was then applied to assess factors interactions and empirical models regarding the physicochemical responses variables (i.e., conductivity, surface tension and viscosity). The main effects of the three independent factors: SDS concentration (x1), NaCl concentration (x2) and xanthan concentration (x3) were determined using in particular a D-optimal design. The results show an important effect of the factors on responses; they also indicate that the synergetic action of surfactant, electrolyte and biopolymer greatly influences these properties. Analysis of variance (ANOVA) showed high variance coefficient (R 2 ) values, thus, ensuring a satisfactory adjustment of the second-order regression model with the experimental data

Determination of micellar system behavior in the presence of salt and water-soluble polymers using the phase diagram technique

The application of micellar systems has been growing during the last years because of their importance in various practical situations. Continued development of their application is necessary. If the principal economic interest of microemulsions is for some time enhanced oil recovery, the following also have significant applications such as pharmaceutical preparations, painting, and products for engine lubrication. The effect of variation in composition of anionic surfactants (α oleifin sulfonates) and the presence of a water-soluble charged polymer (Xanthan gum) and an uncharged polymer [poly (ethylene glycol)] on the phase behaviour of pseudo- ternary systems of water–oil surfactants was investigated. Several domains were observed when the composition of surfactants and cosurfactants (e.g., pentanol) in a mixture is varied. The appearance of these domains in the phase diagram has been attributed to the formation of different Winsor systems

Existence de l'application exponentielle riemannienne d'un groupe de difféomorphismes muni d'une métrique de Sobolev

AbstractWe prove the existence of geodesics of the weak Riemannian Lie group(DiffH∞(Rn),gHk)=(Diff(Rn)∩(Id+⋂k∈NHk(Rn;Rn)),gHk), where gHk is the weak Sobolev metric of order k. Next, we study the Riemannian exponential mapping induced by this metric. For k=1, the result immediately gives the local existence of solution in C∞(;H∞(Rn;Rn)) of the n-dimensional analog of the Camassa–Holm's equation on the Euclidean space Rn