I-69 Finish Line: EPS Fill Under the Interstate

This presentation will look inside the unique design, analysis, and construction of the I-69 bridge structure at SR-252, which utilized expanded polystyrene (EPS) fill. We will discuss the design constraints, geotechnical challenges, and construction methods used to complete this challenging project and keep the I-69 Finish Line project in Martinsville on track for completion

Bubbling over! The behaviour of oil futures along the yield curve

Using a rational bubble framework, a future spot price bubble can be shown to induce explosive behaviour in current long maturity futures prices under particular conditions. To assess this empirically, we employ a novel test of the unit root null against a mildly explosive alternative to investigate multiple bubbles in the crude oil spot and a range of futures prices along the yield curve employing monthly and weekly data from 1995 to 2013. The results indicate that series overwhelmingly exhibit significant bubble periods ending in late 2008 even after allowing for an increase in unconditional volatility. Bubbles in the longer-dated contracts emerged as early as 2004 and are longer lasting than those in nearby and spot contracts. The bubble period was characterized by dramatic shifts in the yield curve associated with institutional spread positions that sharply increased futures prices at longer maturities. The results suggest that periods of time series disconnect between the spot and longer dated futures contracts could potentially form an input into early warning systems for macro-prudential policy

Coulomb dissociation of O-16 into He-4 and C-12

We measured the Coulomb dissociation of O-16 into He-4 and C-12 within the FAIR Phase-0 program at GSI Helmholtzzentrum fur Schwerionenforschung Darmstadt, Germany. From this we will extract the photon dissociation cross section O-16(alpha,gamma)C-12, which is the time reversed reaction to C-12(alpha,gamma)O-16. With this indirect method, we aim to improve on the accuracy of the experimental data at lower energies than measured so far. The expected low cross section for the Coulomb dissociation reaction and close magnetic rigidity of beam and fragments demand a high precision measurement. Hence, new detector systems were built and radical changes to the (RB)-B-3 setup were necessary to cope with the high-intensity O-16 beam. All tracking detectors were designed to let the unreacted O-16 ions pass, while detecting the C-12 and He-4

Numerical Integration of Nonlinear Multidimensional Systems

The suitability of methods from multidimensional systems theory and digital signal processing for the efficient simulation of time and space dependent problems has already been demonstrated. Properly chosen functional transformations for the time and space coordinates turn a partial differential equation into a transfer function description of a multidimensional continuous system. It serves as the starting point for the derivation of a discrete system which closely models the behaviour of the given continuous system and which is suitable for computer implementation. This concept is extended here to the simulation of nonlinear multidimensional systems. The essence of the presented method is a systematic way to turn a nonlinear partial differential equation into a set of ordinary differential equations, for which standard methods for the numerical integration exist. This paper briefly reviews the linear case, points out the various difficulties arising from nonlinearity and shows how to ..

A new Time-of-flight detector for the R 3 B setup

© 2022, The Author(s).We present the design, prototype developments and test results of the new time-of-flight detector (ToFD) which is part of the R3B experimental setup at GSI and FAIR, Darmstadt, Germany. The ToFD detector is able to detect heavy-ion residues of all charges at relativistic energies with a relative energy precision σΔE/ ΔE of up to 1% and a time precision of up to 14 ps (sigma). Together with an elaborate particle-tracking system, the full identification of relativistic ions from hydrogen up to uranium in mass and nuclear charge is possible.11Nsciescopu