286 resultados para Laestadius, Lars Levi: Lappalaisten mytologian katkelmia
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Samlingen med signum HB VIb finns vid huvudbiblioteket och innehåller litteratur om nationalekonomi till och med år 1999. Bankhistoriker ingår i denna samling. Vid Institutionen för samhällsekonomi och statistik finns dessutom en samling nationalekonomiskt litteratur. Nationalekonomisk litteratur har ingått i bokdonationer såväl från hemlandet som från Sverige. Bland donatorerna kan nämnas Gösta Söderholm, Lars Wasastjerna, J.V.Tallqvist och Tor von Wright. Samlingen har kompletterats med friexemplar som erhållits från 1919. Den nationalekonomiska litteraturen söks i Alma med sökfunktionen Signum och söktermen HB VIb. En del litteratur tryckt före 1980 skall sökas manuellt i huvudbibliotekets systematiska kortkatalog, men retroaktiv inmatning i Alma av litteratur tryckt mellan 1830 och 1979 pågår. Från och med år 2000 ingår den nationalekonomiska litteraturen vid huvudbiblioteket i en numerus currens-samling.
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One of the primary goals for food packages is to protect food against harmful environment, especially oxygen and moisture. The gas transmission rate is the total gas transport through the package, both by permeation through the package material and by leakage through pinholes and cracks. The shelf life of a product can be extended, if the food is stored in a gas tight package. Thus there is a need to test gas tightness of packages. There are several tightness testing methods, and they can be broadly divided into destructive and nondestructive methods. One of the most sensitive methods to detect leaks is by using a non destructive tracer gas technique. Carbon dioxide, helium and hydrogen are the most commonly used tracer gases. Hydrogen is the lightest and the smallest of all gases, which allows it to escape rapidly from the leak areas. The low background concentration of H2 in air (0.5 ppm) enables sensitive leak detection. With a hydrogen leak detector it is also possible to locate leaks. That is not possible with many other tightness testing methods. The experimental work has been focused on investigating the factors which affect the measurement results with the H2leak detector. Also reasons for false results were searched to avoid them in upcoming measurements. From the results of these experiments, the appropriate measurement practice was created in order to have correct and repeatable results. The most important thing for good measurement results is to keep the probe of the detector tightly against the leak. Because of its high diffusion rate, the HZ concentration decreases quickly if holding the probe further away from the leak area and thus the measured H2 leaks would be incorrect and small leaks could be undetected. In the experimental part hydrogen, oxygen and water vapour transmissions through laser beam reference holes (diameters 1 100 μm) were also measured and compared. With the H2 leak detector it was possible to detect even a leakage through 1 μm (diameter) within a few seconds. Water vapour did not penetrate even the largest reference hole (100 μm), even at tropical conditions (38 °C, 90 % RH), whereas some O2 transmission occurred through the reference holes larger than 5 μm. Thus water vapour transmission does not have a significant effect on food deterioration, if the diameter of the leak is less than 100 μm, but small leaks (5 100 μm) are more harmful for the food products, which are sensitive to oxidation.
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Asemalaiturin ääniä. Kävelyaskelten ääniä asfaltilla ja katkelmia puheesta.
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Digitoitu 16. 10. 2007.
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Invocatio: Divina adfulgente gratia. Ded.: Gustavus Adolphus Humble, Olavus Osander, Andreas Eckerstedt, Peturs Kexerus, Andreas Ståhl, Sveno Fovelin, Samuel Lyseen, Henricus Bereen, Zacharias Tobiis, Lars Eckman [ruots. runo].
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Invocatio: I.H.W.N.
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Invocatio: [hepreaa].
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Invocatio: I.N.J.
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Invocatio: I.J.N.
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Invocatio: I.J.N.
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Invocatio: D.D.
