Search results for "PROB"

Numerical construction of the density-potential mapping

2018

We demonstrate how a recently developed method Nielsen et al. [Nielsen et al., EPL 101, 33001 (2013)] allows for a comprehensive investigation of time-dependent density functionals in general, and of the exact time-dependent exchange-correlation potential in particular, by presenting the first exact results for two- and three-dimensional multi-electron systems. This method is an explicit realization of the Runge–Gross correspondence, which maps time-dependent densities to their respective potentials, and allows for the exact construction of desired density functionals. We present in detail the numerical requirements that makes this method efficient, stable and precise even for large and rap…

Oscillations of dynamical systems applied in drilling : analytical and numerical methods

2013

Application of time-dependent many-body perturbation theory to excitation spectra of selected finite model systems

2016

In this thesis, an approximate method introduced to solve time-dependent many-body problems known as time-dependent many-body perturbation theory is studied. Many-body perturbation theory for interacting electrons and phonons is reviewed. In particular, the electron propagator G and an unconventional two-component phonon propagator, which satisfy coupled integral Dyson equations, are introduced. In practice, the associated integral kernels known as the electron Σ and phonon self-energies need to be approximated. The conserving approximations known as the Hartree (-Fock) and the first and second Born approximations, which respect the continuity equation between the electron density and curren…

On a nonlinear Schrödinger equation for nucleons in one space dimension

2021

We study a 1D nonlinear Schrödinger equation appearing in the description of a particle inside an atomic nucleus. For various nonlinearities, the ground states are discussed and given in explicit form. Their stability is studied numerically via the time evolution of perturbed ground states. In the time evolution of general localized initial data, they are shown to appear in the long time behaviour of certain cases.

NUTRIZIONE E MICROFLORA BATTERICA INTESTINALE

2009

Pattern of interpersonal problems and mood states in the assessment of treatment-seeking-obese individuals

2008

Depletion of

2020

Child obesity constitutes a risk factor for developing insulin resistance which, if sustained, could lead to more severe conditions like type 2 diabetes (T2D) in adulthood. Our study identified previously unknown species whose depletion (Blautia luti and Blautia wexlerae) is associated with insulin resistance in obese individuals. Our results also indicate that these bacterial species might help to reduce inflammation causally linked to obesity-related complications. Childhood is considered a window of opportunity to tackle obesity. These new findings provide, therefore, valuable information for the future design of microbiota-based strategies for the early prevention of obesity-related com…

Possibilities of using vegetable oils in acne skin care

2022

Oleje roślinne są to ciekłe tłuszcze pochodzenia roślinnego. Pod względem chemicznym to połączenia glicerolu i kwasów tłuszczowych wiązaniem estrowym. Stosunek kwasów tłuszczowych nasyconych i nienasyconych w cząsteczce oleju warunkuje właściwości poszczególnych olejów i ich przydatność m.in. kosmetyczną. Celem pracy była charakterystyka olejów roślinnych ze szczególnym uwzględnieniem budowy chemicznej oraz ukazanie znaczenia poszczególnych kwasów tłuszczowych w kosmetyce i dermatologii. Dokonano podziału olejów ze względu na stosunek ilościowy nienasyconych i nasyconych kwasów tłuszczowych oraz zwrócono uwagę na możliwość zastosowania olejów roślinnych w codziennej pielęgnacji skóry trądzi…

Teachers’ Perceived Self-Efficacy and Sense of Inadequacy across Grade 1 : Bidirectional Associations and Related Factors

2022

The present study investigated bidirectional associations between teachers’ sense of inadequacy and self-efficacy and factors related to them across one academic year. Teachers (N = 52) rated their sense of inadequacy and self-efficacy in fall and spring, and reported the number of students in need of support in spring. The results of cross-lagged path models showed that teachers’ sense of inadequacy in fall negatively predicted their subsequent self-efficacy, especially in the dimensions of student engagement and classroom management. In addition, teachers’ work experience and number of students with need of support in terms of social and behavioral problems were related to teacher self-ef…

DESIGNING AND IMPLEMENTING A BIG OPEN ONLINE COURSE BY USING A 3D VIRTUAL IMMERSIVE ENVIRONMENT – LESSONS LEARNED

2017

Open Education (OE) is a distance learning approach that was strategically chosen by the European Commission (EC) to encourage cost-effective training, upskilling and reskilling of large population groups and workforce with speed and flexibility. Institutions and businesses design and offer Open Online Courses (OOCs) to address skill gaps, organizational and societal needs. OOCs and especially Massive OOCs (MOOCs) are suffering from high rates of attrition, which is attributed to various factors such as learner isolation and lack of motivation to complete the course. Recommendations to address the retention gap in MOOCs include adopting a participation-driven approach, using game design tec…