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Experimental and Theoretical Study of Rack Storage Fires

Popular Abstract in Swedish En experimentell och teoretisk studie kring bränder i varulager i både modell och verklig skala har genomförts. Teoretiska modeller för att beräkna flamhöjder, gas temperaturer, gas hastigheter och värmeflöde inuti spalterna mellan de lagrade varorna presenteras. Modellerna kan t ex användas för att beräkna tid till utlösning av olika sprinklers som används för att skydA theoretical and experimental study of rack storage fires and responsiveness of sprinklers is presented. Free-burn tests with non-combustible and combustible material were carried out in reduced scale with verification in large scale. Formulas for in-rack flame height, excess gas temperature, gas velocity and heat flux to storage walls are provided. The formulas include overall heat release rate,

Experimental oscillator strengths for forbidden lines in complex spectra

In dilute astrophysical plasmas, such as planetary nebulae and H II regions, strong lines appear that only have weak, if any, correspondence to the spectrum of laboratory light sources. Some of these are parity forbidden lines, i.e. emission from long-lived metastable states that cannot decay via normal electric dipole (E1) routes but only via the slower M1 and E2 transitions. The long lifetime of

Multivariate generalized Pareto distributions

Statistical inference for extremes has been a subject of intensive research over the past couple of decades. One approach is based on modelling exceedances of a random variable over a high threshold with the generalized Pareto (GP) distribution. This has proved to be an important way to apply extreme value theory in practice and is widely used. We introduce a multivariate analogue of the GP distri

Circulating antipericyte autoantibodies: A Novel Modifier of Risk of Progression of Diabetic Retinopathy?

Background: Antipericyte autoantibodies (APAAs) are present in high frequency among diabetic subjects with and without nonproliferative retinopathy. This study aimed to determine whether progression of retinopathy in type 2 diabetes was associated with the same medical risk factors in APAA-positive subjects as in APAA-negative subjects. Methods: Type 2 diabetic patients with nonproliferative diabe

The relation between language and thought revealed in reflecting upon words used to express the conception of a problem

The way relationships between symbols and thoughts are created is a general problem in learning, mainly described as "how students' learn to mean". This general problem raises some basic questions concerning how students' relate understanding to words used in learning. The present research provides an alternative perspective on the relationship between thought and language derived from the phenome

Influence of band state mixing on interband magnetotunnelling in broken-gap heterostructures

We investigate in detail the effect of electron and light- and heavy-hole state mixing on the transmission coefficients and current-voltage characteristics of interband tunnelling broken-gap heterostructures in the presence of a quantizing magnetic field perpendicular to the interfaces. Double-barrier and barrierless resonant tunnelling structures made from InAs, A1Sb, and GaSb are considered. The

Macrolide therapy of chronic rhinosinusitis

There is growing evidence that several antibiotics exert their beneficial effect not only by inhibiting or killing bacterial pathogens but also by down-regulating pro-inflammatory mechanisms. This review aims to give an overview of the immunomodulatory properties of macrolide antibiotics in chronic rhinosinusitis and to present a treatment algorithm for managing the difficult CRS patient with long

A nephritogenic peptide induces intermolecular epitope spreading on collagen IV in experimental autoimmune glomerulonephritis

This group previously identified a peptide p13 of alpha 3(IV)NC1 domain of type IV collagen that induces experimental autoimmune glomerulonephritis (EAG) in rats with generation of antibodies to sites on alpha 3(IV)NC1 external to the peptide as a result of intramolecular epitope spreading. It was hypothesized that intermolecular epitope spreading to other collagen IV chains also was induced. Rats

Efficiency of two-phase methods with focus on a planned population-based case-control study on air pollution and stroke

ABSTRACT: We plan to conduct a case-control study to investigate whether exposure to nitrogen dioxide (NO2) increases the risk of stroke. In case-control studies, selective participation can lead to bias and loss of efficiency. A two-phase design can reduce bias and improve efficiency by combining information on the non-participating subjects with information from the participating subjects. In ou

Hyperproinsulinemia segregates young adult patients with newly diagnosed autoimmune (type 1) and non-autoimmune (type 2) diabetes

Objective. To investigate whether measurements of proinsulin and/or intermediate proinsulin degradation products could be used to differentiate between autoimmune (type 1) and non-autoimmune (type 2) diabetes in young adults. Material and methods. Total proinsulin, intact proinsulin and 32,33 split proinsulin concentrations were measured in 25 patients aged 15-34 years with type 1 diabetes, as def

Magnetic compass orientation in C57BL/6 mice

We report evidence for a robust magnetic compass response in C57BL/6J mice. Mice were trained to build their nests in one of four magnetic directions by creating a light gradient along the long axis of a rectangular cage and positioning a nest box at the opposite (dark) end. The mice were then tested overnight in a circular, visually symmetrical arena in one of four magnetic field alignments. The