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Search Results: 1 - 10 of 8012 matches for " Hans Magne Gravseth "
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Er prenatale eller postnatale forhold viktigst for voksen helse? Eksemplet forh yet blodtrykk
Hans Magne Gravseth,Petter Kristensen,Rannveig Nordhagen
Norsk Epidemiologi , 2009,
Abstract: Artikkelen tar utgangspunkt i to forskjellige forklaringsmodeller for voksen sykdom: programmering og livsl pstiln rming. Programmering inneb rer en p virkning i en tidlig kritisk fase som resulterer i en varig skade, mens en livsl pstiln rming er studien av langsiktige effekter av p virkninger gjennom alle livsfaser. Disse to m tene forklare voksen sykdom p blir demonstrert ved bruke eksemplet forh yet blodtrykk. Vi oppsummerer funn i nyere studier som belyser hvordan determinanter i ulike livsfaser, s rlig i de f rste leve r, kan p virke senere blodtrykk. Man finner gjennomg ende en svak invers sammenheng mellom f dselsvekt og senere blodtrykk, og det er vist en svak gunstig effekt p blodtrykket av bli brystern rt. Tidlig innhentingsvekst er hovedsakelig vist ha en uheldig virkning p senere blodtrykk; det kan imidlertid v re fordelaktig i utviklingsland. BMI er sterkt assosiert med blodtrykk hos b de voksne og barn. Enkelte har ogs funnet en interaksjon mellom f dselsvekt og voksen BMI, med sterkest invers sammenheng mellom f dselsvekst og senere blodtrykk hos de med en h y voksen BMI. Siden b de blodtrykk og BMI sporer fra barndom til voksen alder, er tidlig forebygging viktig. Blant voksne er det tendens til en sosial gradient i blodtrykket, i hovedsak mediert gjennom tradisjonelle risikofaktorer. Ensidig fokusering p s vel programmering som p voksenlivets risikofaktorer har ofte begrenset forklaringsverdi. I en livsl pstiln rming, som har kommet som en respons p dette, tar man hensyn til b de programmering, livsstilsfaktorer og sosiale forhold. The paper describes two different explanation models for adult disease: programming and the life course approach. In programming, there is a stimulus or insult at an early critical period of development that has lasting significance, whereas a life course approach is the study of long-term effects of exposures during all stages of life. These two ways of explaining adult disease are demonstrated by using elevated blood pressure as an example. We summarize findings in newer studies on how determinants in different stages of life, especially during the earliest years, may influence later blood pressure. In general, a weak inverse association between birth weight and later blood pressure is found. Breast-feeding is shown to have a weak favourable effect on blood pressure. Early catch-up growth is generally seen having an adverse effect on later blood pressure; it could have some benefits in developing countries, however. BMI is at all ages strongly associated with blood pressure. An interaction
Impact of life course determinants on work participation among young Norwegian men
Petter Kristensen,Tor Bjerkedal,Lorentz M. Irgens,Hans Magne Gravseth
Norsk Epidemiologi , 2009,
Abstract: Background Methods: Through linkage between several national registers, containing personal information from birth into adult age, we established a longitudinal, population-based cohort. Study participants were all 158 026 male singletons born in Norway in 1967–1971 as registered by the Medical Birth Registry of Norway who were national residents at age 29. Study outcome was unemployment defined as a lack of personal income among persons who were not under education in the calendar year of their 29th birthday. We computed unemployment risk in separate strata, and adjusted risk ratios and population attributable risks as measures of association and impact, respectively. Results Conclusion Introduksjon
Charge Fractionalization on Quantum Hall Edges
Mats Horsdal,Marianne Rypest?l,Hans Hansson,Jon Magne Leinaas
Physics , 2011, DOI: 10.1103/PhysRevB.84.115313
Abstract: We discuss the propagation and fractionalization of localized charges on the edges of quantum Hall bars of variable widths, where interactions between the edges give rise to Luttinger liquid behavior with a non-trivial interaction parameter g. We focus in particular on the separation of an initial charge pulse into a sharply defined front charge and a broader tail. The front pulse describes an adiabatically dressed electron which carries a non-integer charge, which is \sqrt{g} times the electron charge. We discuss how the presence of this fractional charge can, in principle, be detected through measurements of the noise in the current created by tunneling of electrons into the system. The results are illustrated by numerical simulations of a simplified model of the Hall bar.
James E. Grunig m.fl.: Excellence in Public Relations and Communiation Management
Magne Haug
MedieKultur : Journal of Media and Communication Research , 1993,
Abstract:
M lefeil i regresjonsanalyse
Magne Thoresen
Norsk Epidemiologi , 2009,
Abstract: -
Efecto del dise o de revestimientos sobre el consumo de potencia en molienda
Valderrama, M.,Magne, L.
Revista de Metalurgia , 1996,
Abstract: Power mill draw was measured in a 290 x 110 mm laboratory batch mill, loaded with balls, cylinders or metal grains. Angle between front face of the lifter and its base-surface are the key parameter to control power consumption. A 45° lifter front angle and about 85 % rotational speed lead to the maximum power draw. As the mill is provided with higher lifter front angles, a decrease in power occurs, and the maximum with respect to the mill velocity is shifted to lower values. For lifter front angle lower than 45°, power consumption at low mill rotational speed is reduced, and the maximum is often moved beyond the critical speed value, which indicates slip of the load. Lifter height has a variable effect upon power draw, depending on the front angle and its relative size compared to the grinding bodies. Generally, an increase in height reduces the maximum power draw, and it is obtained at a lower rotational speed. Low-angle lifters are less sensible to the height. Number of lifter did not show any effect on power draw. Se midió el consumo de potencia en un molino discontinuo de laboratorio de 290 x 110 mm cargado con bolas, cilindros o granallas de tama o uniforme. El ángulo formado por la cara frontal de un levantador y la superficie base de la pieza son el parámetro clave para controlar el consumo de potencia. Los mayores valores se obtienen utilizando levantadores con ángulos de 45° y velocidad de rotación del molino de aproximadamente 85 % de la velocidad crítica. Cuando el molino es equipado con levantadores de alto ángulo de ataque, el consumo de potencia decrece y la velocidad de máxima potencia se desplaza a valores más bajos. Para levantadores con ángulos menores de 45°, el consumo de potencia a bajas velocidades se reduce, incrementándose el máximo más allá de la velocidad crítica en muchos casos, lo que indica resbalamiento de la carga. La altura del levantador tiene un efecto variable sobre la potencia, dependiendo del ángulo de ataque del levantador y su tama o relativo frente a los medios de molienda. La mayor altura reduce el consumo máximo de potencia, que se alcanza a una velocidad de giro más baja. Los levantadores de ángulos menores son menos sensibles a la altura.
Dynamic Simulation of Chemical Engineering Systems by the Sequential Modular Approach
Magne Hillestad,Terje Hertzberg
Modeling, Identification and Control , 1986, DOI: 10.4173/mic.1986.3.1
Abstract: An algorithm for dynamic simulation of chemical engineering systems, using the sequential modular approach, is proposed. The modules are independent simulators, and are integrated over a common time horizon. Interpolation polynomials are used to approximate input variables. These input polynomials are updated before modules are intergrated in order to interpolate output from preceding module(s) and thereby increase coupling and stabilize the computation. Tear stream variables have to be predicted at future time tn+1 and various prediction methods are proposed.
An Implementation of Estimation Techniques to a Hydrological Model for Prediction of Runoff to a Hydroelectric Power-Station
Magne Fjeld,Sverre Aam
Modeling, Identification and Control , 1981, DOI: 10.4173/mic.1981.1.3
Abstract: Parameter and state estimation algorithms have been applied to a hydrological model of a catchment area in southern Norway to yield improved control of the household of water resources and better economy and efficiency in the running of the power station, as experience proves since the system was installed on-line in the summer of 1978.
Psoriasisartritt
Tor Magne Madland
Norsk Epidemiologi , 2009,
Abstract: Psoriasisartritt (PsA) er betegnelsen p en kronisk artrittsykdom som kan oppst hos personer med psoriasis. Det er den nest hyppigste leddgiktssykdom i befolkningen, etter revmatoid artritt (RA), og prevalens hos voksne er estimert til 0,1-0,2%. I artikkelen gis en kort beskrivelse av sykdomskarakteristika, klassifikasjon og behandling, mens hovedfokus er sykdommens epidemiologi i nordiske land. I tillegg til s k i PubMed bygger artikkelen p resultater fra egen unders kelse.
Psoriasisartritt
Tor Magne Madland
Norsk Epidemiologi , 2008,
Abstract:
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