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Search Results: 1 - 10 of 115 matches for " Ingvar Byrkjedal "
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Lycodes adolfi Nielsen & Foss , 1993 (Teleostei: Zoarcidae) recorded near Jan Mayen and in the eastern part of the Norwegian Sea
Ingvar Byrkjedal,Torleiv Brattegard,Peter Rask M?ller
Fauna Norvegica , 2009, DOI: 10.5324/fn.v28i0.562
Abstract: Specimens of Lycodes adolfi were collected from an epibenthic sampler at six stations near Jan Mayen and in the eastern part of the Norwegian Sea. The stations were at depths from 708 to 2150 m and all of them had subzero water temperatures. The records substantially increase the known distribution of this cold-water eelpout, previously known only from waters near Greenland.
Application of a Large Eddy Simulation Database to Optimization of First Order Closures for Neutral and Stably Stratified Boundary Layers
Igor N. Esau,Oyvind Byrkjedal
Physics , 2006,
Abstract: Large-eddy simulation (LES) is a well-established numerical technique, which resolves the most energetic turbulent fluctuations in the planetary boundary layers. Averaging these fluctuations, high-quality profiles of mean values and turbulence statistics can be obtained in experiments with well-defined initial and boundary conditions. Hence, the LES data can be beneficial for assessment and optimization of turbulence closure schemes. A database of 80 LES runs for neutral and stably stratified PBLs (DATABASE64) is applied in this study to optimize the first-order turbulence closure (FOC). Approximations for the mixing length scale and stability correction functions have been tuned to minimise a relative root-mean square error over the entire DATABASE64. New stability functions have correct asymptotes describing regimes of strong and week mixing found in theoretical exercises, atmospheric data and LES. The correct asymptotes exclude the need for a critical Richardson number in the FOC formulation. Further, we analysed the FOC quality as functions of the integral PBL stability and the vertical model resolution. We show that the FOC is never perfect because the turbulence in the upper half of the PBL is not generated by the local gradients. Accordingly, the parameterized and LES fluxes decorrelate in the upper PBL. With this imperfection in mind, we show that there is no systematic quality deterioration of the FOC in strongly stable PBLs provided the vertical model resolution is better than 10 levels within the PBL. In agreement with previous studies, we found that the quality improves slowly with the vertical resolution refinement. It is generally wise to not overstretch the mesh in the lowest 500 m of the atmosphere where majority of the observed, simulated and theoretically predicted stably stratified PBLs are located.
On the correction of reversing thermometers and construction of graph for total correction
Emilsson, Ingvar;
Boletim do Instituto Oceanográfico , 1954, DOI: 10.1590/S0373-55241954000100002
Abstract: as fórmulas para a corre??o de term?metros reversíveis, protegidos e desprotegidos, apresentadas neste trabalho, s?o derivadas diretamente a partir da equa??o exata da expans?o térmica. duas dessas fórmulas, válidas para term?metros protegidos ou desprotegidos respectivamente, adaptam-se particularmente bem ao cálculo de tabelas que podem servir para a confec??o de gráficos de corre??o. destas pode-se obter a corre??o total com grande precis?o partindo diretamente das leituras do term?metro usado, mesmo quando se tratar de term?metros cujo índice de corre??o seja igual a 1.0 oc. um gráfico de corre??o onde esses resultados s?o aproveitados é descrito a seguir. o método consiste em construir um grafico matriz, um para term?metros protegidos, outro para os desprotegidos. desses s?o tirados gráficos, reproduzindo-se fotograficamente a por??o desejada do gráfico matriz, para cada term?metro individualmente.
Involving service users in health and social care research
Ingvar Karlberg
International Journal of Integrated Care , 2006,
Getting health reform right: a guide to improving performance and equity
Ingvar Karlberg
International Journal of Integrated Care , 2004,
Emergency care should be integrated care
Ingvar Karlberg
International Journal of Integrated Care , 2004,
The use of wild plants as food in pre-industrial Sweden
Ingvar Svanberg
Acta Societatis Botanicorum Poloniae , 2012, DOI: 10.5586/asbp.2012.039
Abstract: This paper is a review of the actual gathering and use of wild edible plants in the 18th and 19th centuries, with a brief concluding discussion on the present day use of wild plants as food within Sweden. The peasants and the nomads in pre-industrial Sweden utilised very few wild plant taxa as food. Many even despised the wild fruits and green plants. Some plants and fruits were earlier mostly eaten fresh on the spot, or gathered for consumption in bread, gruel or soup. Other fruits were dried or preserved in other ways. In times of food shortages the amount of wild plants increased in the diet, but still the peasantry and nomads were often able to use fish and game to provide enough nutrients. With access to cheap sugar in the early 20th century wild fruits (Vaccinium myrtillus L., V. vitis-idaea L., and Rubus chamaemorus L.) increased in importance, especially among urban-dwellers and within food industry. In the last few decades fungi have also become part of the urban diet. Fifty years ago working class people gathered only Cantharellus cibarius (Fr.) and occasionally Boletus edulis Bull. Nowadays more taxa are utilised within the Swedish households, and especially the easy to pick Cantharellus tubaeformis (Pers.) has become very popular recently. Harvesting fruits and mushrooms in the forests is a popular pastime for many urban people, but also a source of income for immigrants and especially foreign seasonal labour. The only traditional green wild food plant that is regularly eaten in contemporary Sweden is Urtica dioica L.
Folk Knowledge of an Individual Plant Specimen: The Case of the Royal Fern (Osmunda regalis L.) in Virestad Parish, Sm land, Sweden
Ingvar Svanberg
Ethnobiology Letters , 2012,
Abstract: Ethnobiological studies of local economic or folk religious uses of plants often rely on the assumption that plant use relates to folk knowledge about specific taxa. However, in some cases,folk knowledge is more about beliefs concerning an individual plant. When Carl Linnaeus traveled in 1749 through his native province of Sm land, Sweden, he observed a striking specimen of a royal fern (Osmunda regalis L.), which was being used by a local healer. The appearance and unusually large size of this individual plant specimen were possibly responsible for its use. This species has not been used elsewhere in Sweden and historical data refer only to the single specimen observed by Linnaeus.
The helium fine-structure controversy
Ingvar Lindgren
Physics , 2008,
Abstract: There is presently disagreement between theory and experiment as well as between different theoretical calculations concerning the fine-structure splitting of the lowest P state of the neutral helium atom. We believe that we have found a minor error in the formulas used by Drake et al. (Can. J. Phys. 80, 1195 (2002)) in their calculations, and we may have an explanation how the error has occurred. To what extent this might resolve (part of) the discrepancy is not known at present.
Many-body-QED perturbation theory: Connection to the Bethe-Salpeter equation
Ingvar Lindgren
Physics , 2005, DOI: 10.1139/p05-027
Abstract: The connection between many-body theory (MBPT)--in perturbative and non-perturbative form--and quantum-electrodynamics (QED) is reviewed for systems of two fermions in an external field. The treatment is mainly based upon the recently developed covariant-evolution-operator method for QED calculations [Lindgren et al. Phys. Rep. 389, 161 (2004)], which has a structure quite akin to that of many-body perturbation theory. At the same time this procedure is closely connected to the S-matrix and the Green's-function formalisms and can therefore serve as a bridge between various approaches. It is demonstrated that the MBPT-QED scheme, when carried to all orders, leads to a Schroedinger-like equation, equivalent to the Bethe-Salpeter (BS) equation. A Bloch equation in commutator form that can be used for an "extended" or quasi-degenerate model space is derived. It has the same relation to the BS equation as has the standard Bloch equation to the ordinary Schroedinger equation and can be used to generate a perturbation expansion compatible with the BS equation also for a quasi-degenerate model space.
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