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The γ∗γ∗→ ηc (1S; 2S) transition form factor from quarkonium wave functions

We discuss γ ∗γ ∗→ ηc(1S) ; ηc (2S) transition form factor for both virtual photons. The general formula is given. We use difierent models for the cc̄ wave function obtained from the solution of the Schrödinger equation for diffierent cc̄ potentials: harmonic oscillator, Cornell, logarithmic, power-law, Coulomb and Buchmüller{Tye. We showed some examples of wave functions in the Light Front repres

Förbättrade metoder för samhällsekonomisk analys av kollektivtrafikinvesteringar

Denna rapport sammanfattar några studier som på olika sätt syftar till att förbättra metodiken för att analysera samhällsekonomiska effekter av kollektivtrafikinvesteringar. Förbättringarna som behandlas är 1) vikten av att ta med bristande kapacitet (trängsel) i kalkylerna; 2) förbättrade beräkningar av driftskostnader; 3) effekter av tillgänglighet på arbetsmarknad och produktivitet (s k ”wider

Striking a fair balance between the protection of creative content and the need to foster its dissemination : The challenges posed by Internet linking and meta search engines

In recent years, the ability to make available, locate and access copyright protected content over the Internet has increased considerably. Some business models are directly aimed at linking or locating content already made available by other services. Such business models may create value for end users by making it easier to locate and find content on the Internet, but at the same time, they may

Apps for modal analysis to characterize the complex modulus of asphalt concrete

The time and temperature dependent dynamic modulus of asphalt concrete is a key parameter to modern pavement design and to pavement quality. However, accurate measurements of the complex modulus through conventional cyclic testing are expensive regarding both time and costs. Novel test methods based on modal analysis facilitate economic, accurate and faster determination of linear viscoelastic mat

The effect of multiple hydrotropic treatments on the delignification of hardwood

Hydrotropic extraction (HEX) is a method for the delignification of lignocellulose that has been given increasing amounts of attention during the last couple of years. A hydrotrope is an amphiphilic substance, which, in high enough concentrations, can improve solubility of otherwise poorly soluble substances in water. The most commonly used substance for HEX-delignification is sodium xylenesulfona

The sanitation and urban agriculture nexus: urine collection and application as fertilizer in São Paulo, Brazil

Separately collected urine is an attractive potential fertilizer because of its high nutrient content, low cost, and inherent linkage of urban wastewater management and peri-urban agriculture. Urine from waterless urinals was applied to corn and lettuce plants to examine the impact of urine application rates and frequency on plant growth and soil parameters. In both corn and lettuce experiments, u