Stockholm University

About: Stockholm University is a education organization based out in Stockholm, Sweden. It is known for research contribution in the topics: Population & Context (language use). The organization has 21052 authors who have published 62567 publications receiving 2725859 citations. The organization is also known as: University of Stockholm & Stockholms universitet.

Barbero's Hamiltonian derived from a generalized Hilbert-Palatini action

Abstract: Barbero recently suggested a modification of Ashtekar's choice of canonical variables for general relativity. Although leading to a more complicated Hamiltonian constraint this modified version, in which the configuration variable still is a connection, has the advantage of being real. In this article we derive Barbero's Hamiltonian formulation from an action, which can be considered as a generalization of the ordinary Hilbert-Palatini action.

Water: A Tale of Two Liquids

Abstract: Water is the most abundant liquid on earth and also the substance with the largest number of anomalies in its properties. It is a prerequisite for life and as such a most important subject of current research in chemical physics and physical chemistry. In spite of its simplicity as a liquid, it has an enormously rich phase diagram where different types of ices, amorphous phases, and anomalies disclose a path that points to unique thermodynamics of its supercooled liquid state that still hides many unraveled secrets. In this review we describe the behavior of water in the regime from ambient conditions to the deeply supercooled region. The review describes simulations and experiments on this anomalous liquid. Several scenarios have been proposed to explain the anomalous properties that become strongly enhanced in the supercooled region. Among those, the second critical-point scenario has been investigated extensively, and at present most experimental evidence point to this scenario. Starting from very low ...

Illness and narrative

Abstract: The article gives a review of the last ten years' of research on illness narratives, and organises this research around certain central themes. Four aspects of illness narratives are discussed: 1. a proposed typology giving three different kinds of illness narratives - illness as narrative, narrative about illness, and narrative as illness; 2. considerations of what can be accomplished with the help of illness narratives; 3. problems connected with how illness narratives are organised; and 4. the social context of telling and its influence on the narrative. It is argued that as social scientists we can use illness narratives as a means of studying not only the world of biomedical reality, but also the illness experience and its social and cultural underpinnings.

The structure of crystalline profilin-beta-actin.

Abstract: The three-dimensional structure of bovine profilin–β-actin has been solved to 2.55 A resolution by X-ray crystallography. There are several significant local changes in the structure of β-actin compared with α-actin as well as an overall 5° rotation between its two major domains. Actin molecules in the crystal are organized into ribbons through intermolecular contacts like those found in oligomeric protein assemblies. Profilin forms two extensive contacts with the actin ribbon, one of which appears to correspond to the solution contact in vitro.

The role of topography on catchment-scale water residence time

Abstract: 624 km 2 ) that represent diverse geologic and geomorphic conditions in the western Cascade Mountains of Oregon Our primary objective was to determine the dominant physical controls on catchment-scale water residence time and specifically test the hypothesis that residence time is related to the size of the basin Residence times were estimated by simple convolution models that described the transfer of precipitation isotopic composition to the stream network We found that base flow mean residence times for exponential distributions ranged from 08 to 33 years Mean residence time showed no correlation to basin area (r 2 < 001) but instead was correlated (r 2 = 091) to catchment terrain indices representing the flow path distance and flow path gradient to the stream network These results illustrate that landscape organization (ie, topography) rather than basin area controls catchment-scale transport Results from this study may provide a framework for describing scale-invariant transport across climatic and geologic conditions, whereby the internal form and structure of the basin defines the first-order control on base flow residence time