Stålförstärkning av limträbalkar för att öka hållfasthet och styvhet

In today’s housing market, open house plans are requested increasingly. This puts a demand on the beams being used to manage longer spans and is therefore exposed to larger loads. To manage these larger loads, one solution is to increase the beam dimensions. Because of demands to fulfill standardized measurements for doors, ceiling heights and roofing heights, there is not always room for the beam dimensions required. Another option is to reinforce the beams with another material to maintain the smaller dimensions. This report aims to examine the strength and stiffness of steel reinforced glulam beams and which dimensions and placement of the steel that is most beneficial for increasing strength and stiffness. This was accomplished by calculating strength and stiffness according to Bernoulli-Euler beam theory and by bend testing eighteen beams with four different configurations: one without reinforcement, one reinforced in the bottom, one reinforced on the top and one with reinforcement on both top and bottom. The results from the bending tests showed an increase of 33 – 77 % in bending strength and 70 – 95 % improvement in stiffness, depending on the configuration. This improvement correlates relatively well with the produced result from the calculations, even though some differences could be found. The most beneficial configuration, with regards to strength, was steel on the top, but the configuration with steel on the top as well on the bottom came a very close second. This beam should produce better results according to the calculations. On the other hand, configurations with steel on the bottom or the top correlated well with the calculations. At testing, the configuration with steel on the bottom showed marginally better strength results. This is however difficult to statistically determine because few beams were tested

北畠治房書翰 : [書写資料] / 北畠治房

刊行年不明雑 / 和装kosh

Distributional Preferences in Adolescent Peer Networks

We study distributional ("social") preferences in adolescent peer networks. Using incentivized choices between allocations for themselves and a passive agent, children are classified into efficiency-loving, inequality-loving, inequality-averse, and spiteful types. We find that pairs of students who report a friendship link are more likely to exhibit the same preference type than other students that attend the same school. The relation between types is almost completely driven by inequality-loving and spiteful types. Further analyses suggest that preference peer networks are mainly formed by selection into the network and, to a smaller degree, by preference transmission. The role of peer networks in explaining distributional preferences goes beyond network composition effects. A low rank in academic performance and a central position within the network relate positively to a higher likelihood of being classified as spiteful. Hence, social hierarchies seem to be correlated with distributional preference types

Reactivity of commercially available Fmoc amino acids: supplementary information

Supplementary Information: Experimental Procedures, Analytical LCMS of compounds, Mass spectrum molecular formula report

Facile synthesis of mono- and bis-methylated Fmoc-Dap, -Dab and -Orn amino acids

A new methodology for the synthesis of side chain mono- or bis-methylated Fmoc-Dap, -Dab and -Orn amino acids was developed by probing the reactivity of commercially available Fmoc amino acids

Modelling of Peripheral Fluid Accumulation after a Crystalloid Bolus in Female Volunteers – A Mathematical Study

Objective. To simultaneously model plasma dilution and urinary output in female volunteers

Dollarization in Ecuador and El Salvador

This thesis examines the impact of dollarization in Ecuador and El Salvador. The variables studied are inflation, interest rate and GDP growth. We compare mean values and volatility before and after the implementation of the US dollar to analyze significant changes. Interest rates and inflation fell and stabilized in both countries after dollarization. The results regarding GDP growth are ambiguous which is explained by country specific factors. Furthermore, we analyze the impact of dollarization on trade by using a gravity regression model. Earlier empirical studies have shown equivocal results regarding the trade enhancing effect. Our findings provide no support of an increase in trade due to dollarization