Search for dissertations about: "functional gradient"

Showing result 1 - 5 of 134 swedish dissertations containing the words functional gradient.

2. 1. The architecture of the aging brain : functional reorganization, structural changes, and the role of dopamine receptors

   Author : Robin Pedersen; Alireza Salami; Anna Rieckmann; Anders Wåhlin; Lars Nyberg; Roser Sala-Llonch; Umeå universitet; []
   Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; brain architecture; functional connectivity; dopamine; aging; cognition; memory; functional magnetic resonance imaging; positron emission tomography; graph theory; Laplacian eigenmapping; gradient;

   Abstract : Aging is associated with reorganization of functional brain architecture, potentially leading tocognitive decline in older age. However, the mechanisms responsible for alterations in functionalbrain architecture remain poorly understood. READ MORE

4. 2. Nonlocal Correlations in Density Functional Theory

   Author : Henrik Rydberg; Chalmers tekniska högskola; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; bonding; GGA; adhesion; graphene; DFT; exchange; adsorption; LDA; first principles; polarization; vdW; determinants; correlation; graphite; surface states; van der Waals; density-functional theory; physisorption; nonlocal; functional;

   Abstract : In Density Functional Theory, the widely used local and semilocal approximations to the exchange-correlation energy, the local density approximation (LDA) and the generalized gradient approximations (GGAs), lack a physical description of truly nonlocal correlation effects, which are absolutely essential for a proper description of soft matter. A scheme is proposed that provides a basis for systematic improvements beyond LDA and GGA, including correlations at intermediate and long range, giving rise to bonds of pure van der Waals type as well as more intricate, intermediate-range correlation bonds. READ MORE

5. 3. Long-Term Functional Psychosis : Epidemiology in Two Different Counties in Sweden

   Author : Birgitta Widerlöv; Lars von Knorring; Jerker Hetta; Uppsala universitet; []
   Keywords : Psychiatry; epidemiology; functional psychosis; schizophrenia; prevalence; rural-urban gradient; comparative study; antipsychotic drugs; diagnostic criteria; mortality; Psykiatri;

   Abstract : This thesis is based on two independent studies, the first in Stockholm County (index year 1984; n=302), and the second, a replication and validation study, in Uppsala County (index year 1991; n=455).The general aim was to study all individuals with Long-term Functional Psychosis (LFP) within the two counties of Sweden from an epidemiological perspective and to perform specific studies on a subgroup of individuals with schizophrenia. READ MORE

6. 4. Epidemiology of cardiovascular disease risk factors in Ethiopia : the rural-ruban gradient

   Author : Fikru Tesfaye; Rainer Sauerborn; Umeå universitet; []
   Keywords : Epidemiology; epidemiologi;

   Abstract : BackgroundChanges in the population structure and the main causes of death result in the growing burden of chronic diseases, which characterize the epidemiological transition. The transition takes place at different paces in different parts of the world. READ MORE

7. 5. Specification of the lens and olfactory placodes and dorsoventral patterning of the telencephalon

   Author : My Sjödal; Juha Partanen; Umeå universitet; []
   Keywords : telencephalon; olfactory; lens; BMP; RA; FGF; Wnt; development; placode; gradient; chick; nervous system; dorsoventral; medicinsk utvecklings- och neurobiologi; Developmental Neurosciences;

   Abstract : The vertebrate nervous system is a highly complex and intriguing structure with diverse functions. To understand the functional nervous system, we first have to be aware of how it is assembled during development. READ MORE