391 research outputs found
Vad får man för pengarna? - En studie av svenska aktiefonder och deras avgifter
Studiens syfte är att utreda eventuella samband mellan avgifterna hos aktiefonder med svensk exponering och deras riskjusterade avkastning. Utredningen görs genom att beräkna de utvalda fondernas Sharpekvot och Jensens alfa från deras NAV-kurs på veckobasis med återinvesterad utdelning, där NAV-kursen inkluderar avdrag för fondavgift. Studiens tidsram är perioden 2007 till 2018, där både positiva och negativa genomgående marknadsrörelser finns representerade, samt två kortare perioder med positiv respektive negativ börsutveckling. Med hjälp av regressionsanalys undersöks sambandet mellan fondernas respektive Jensens alfa och Sharpekvoter och fondernas årliga avgifter. Studien finner ett generellt signifikant positivt samband mellan fondavgiften och den riskjusterade avkastningen. Detta antyder att fonder med högre avgift har en bättre riskjusterad avkastning
New apparatus for DTA at 2000 bar: thermodynamic studies on Au, Ag, Al and HTSC oxides
A new DTA (Differential Thermal Analysis) device was designed and installed
in a Hot Isostatic Pressure (HIP) furnace in order to perform high-pressure
thermodynamic investigations up to 2 kbar and 1200C. Thermal analysis can be
carried out in inert or oxidising atmosphere up to p(O2) = 400 bar. The
calibration of the DTA apparatus under pressure was successfully performed
using the melting temperature (Tm) of pure metals (Au, Ag and Al) as standard
calibration references. The thermal properties of these metals have been
studied under pressure. The values of DV (volume variation between liquid and
solid at Tm), ROsm (density of the solid at Tm) and ALPHAm (linear thermal
expansion coefficient at Tm) have been extracted. A very good agreement was
found with the existing literature and new data were added. This HP-DTA
apparatus is very useful for studying the thermodynamics of those systems where
one or more volatile elements are present, such as high TC superconducting
oxides. DTA measurements have been performed on Bi,Pb(2223) tapes up to 2 kbar
under reduced oxygen partial pressure (p(O2) = 0.07 bar). The reaction leading
to the formation of the 2223 phase was found to occur at higher temperatures
when applying pressure: the reaction DTA peak shifted by 49C at 2 kbar compared
to the reaction at 1 bar. This temperature shift is due to the higher stability
of the Pb-rich precursor phases under pressure, as the high isostatic pressure
prevents Pb from evaporating.Comment: 6 figures, 3 tables, Thermodynamics, Thermal property, Bi-2223,
fundamental valu
Recovery Kinetics in Commercial Purity Aluminum Deformed to Ultrahigh Strain: Model and Experiment
Bemerkungen zu einer Arbeit von W. Heraeus über die Abhängigkeit der thermoelektrischen Kraft des Eisens von seiner Struktur
Bemerkung zu einer Arbeit von Adolf Böhi über ein Verfahren zur Messung der absoluten Potentialdifferenzen, welche beim Kontakt beliebiger Leiter auftreten
Device for simultaneous measurement of the Peltier and Seebeck coefficients verification of the Kelvin relation
We have designed and built an experimental device, which we called a "thermoelectric bridge." Its primary purpose is simultaneous measurement of the relative Peltier and Seebeck coefficients. The systematic errors for both coefficients are equal with this device and manipulation is not necessary between the measurement of one coefficient and the other. Thus, this device is especially suitable for verifying their linear relation postulated by Lord Kelvin. Also, simultaneous measurement of thermal conductivity is described in the text. A sample is made up of the couple nickel¿platinum, taking measurements in the range of ¿20¿60°C and establishing the dependence of each coefficient with temperature, with nearly equal random errors ±0.2%, and systematic errors estimated at ¿0.5%. The aforementioned Kelvin relation is verified in this range from these results, proving that the behavioral deviations are ¿0.3% contained in the uncertainty ±0.5% caused by the propagation of error
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