Investigation of the aerodynamic characteristics and wing-deployment transients of the NASA DL-4 body with a sailwing landing aid Final report

Aerodynamic characteristics and wing deployment transients of NASA DL-4 lifting body fitted with sailwing landing ai

Potentials and Limits to Basin Stability Estimation

Acknowledgments The authors gratefully acknowledge the support of BMBF, CoNDyNet, FK. 03SF0472A.Peer reviewedPublisher PD

Cultural differentiation or self-exclusion. On young Turks’ and Repatriates’ dealing with experiences of discrimination in Germany

Based upon Bourdieu’s ‘theory of capital’ and Willis’s ‘theory of cultural production’, the article scrutinizes the interrelation between perceived discrimination, self-exclusion and cultural differentiation. The empirical analysis is based on a longitudinal study by the German Youth Institute, which was set up to explore the transition of young Turks from school to vocational training and employment. The data point out that young immigrants who are dealing with experiences of devaluation of their (origin-)specific cultural capital and who are disadvantaged regarding the accessibility of dominant cultural capital bring about a production of a counterculture. They are less likely to exclude themselves in the sense of internalizing the rightness of the dominant culture

The Impact of COVID-19 on immigration: the transformation of Norwegian migration policy on asylum seekers

Until just a year ago, hardly anyone believed that the increasingly unrestrained growth in mobility could be so abruptly interrupted by a radical immobilisation of large population groups. Neither mobility studies nor other research fields had foreseen this kind of scenario in their mobility and migration models. And why should have they? In the past decades, the belief in unconstrained mobility, as well as the practice of mobility and its scientific modelling, relied on the idea of unbounded growth at the sub-national, national and supra-national level. The article focuses on immigration to Norway, showing how institutional constraints were used to deal with the spread of COVID-19 and how they affected immigration to the country. Due to complexity reasons, we focus exclusively on the situation of asylum seekers, giving additional attention to unaccompanied minors. These groups’ migration status is assumed to make them especially susceptible to the newly established immigration measures. Drawing upon a combined focus of data on migration regulations and asylum application statistics, we examine what impact mobility-related COVID-19 measures implemented in Norway since January 2020 had on asylum procedures, asylum mobility and asylum applications in Norway

The quasi-free-standing nature of graphene on H-saturated SiC(0001)

We report on an investigation of quasi-free-standing graphene on 6H-SiC(0001) which was prepared by intercalation of hydrogen under the buffer layer. Using infrared absorption spectroscopy we prove that the SiC(0001) surface is saturated with hydrogen. Raman spectra demonstrate the conversion of the buffer layer into graphene which exhibits a slight tensile strain and short range defects. The layers are hole doped (p = 5.0-6.5 x 10^12 cm^(-2)) with a carrier mobility of 3,100 cm^2/Vs at room temperature. Compared to graphene on the buffer layer a strongly reduced temperature dependence of the mobility is observed for graphene on H-terminated SiC(0001)which justifies the term "quasi-free-standing".Comment: 3 pages, 3 figures, accepted for publication in Applied Physics Letter

Emergent inequality and business cycles in a simple behavioral macroeconomic model

Standard macroeconomic models assume that households are rational in the sense that they are perfect utility maximizers and explain economic dynamics in terms of shocks that drive the economy away from the steady state. Here we build on a standard macroeconomic model in which a single rational representative household makes a savings decision of how much to consume or invest. In our model, households are myopic boundedly rational heterogeneous agents embedded in a social network. From time to time each household updates its savings rate by copying the savings rate of its neighbor with the highest consumption. If the updating time is short, the economy is stuck in a poverty trap, but for longer updating times economic output approaches its optimal value, and we observe a critical transition to an economy with irregular endogenous oscillations in economic output, resembling a business cycle. In this regime households divide into two groups: poor households with low savings rates and rich households with high savings rates. Thus, inequality and economic dynamics both occur spontaneously as a consequence of imperfect household decision-making. Adding a few “rational” agents with a fixed savings rate equal to the long-term optimum allows us to match business cycle timescales. Our work here supports an alternative program of research that substitutes utility maximization for behaviorally grounded decision-making

Moody's Correlated Binomial Default Distributions for Inhomogeneous Portfolios

This paper generalizes Moody's correlated binomial default distribution for homogeneous (exchangeable) credit portfolio, which is introduced by Witt, to the case of inhomogeneous portfolios. As inhomogeneous portfolios, we consider two cases. In the first case, we treat a portfolio whose assets have uniform default correlation and non-uniform default probabilities. We obtain the default probability distribution and study the effect of the inhomogeneity on it. The second case corresponds to a portfolio with inhomogeneous default correlation. Assets are categorized in several different sectors and the inter-sector and intra-sector correlations are not the same. We construct the joint default probabilities and obtain the default probability distribution. We show that as the number of assets in each sector decreases, inter-sector correlation becomes more important than intra-sector correlation. We study the maximum values of the inter-sector default correlation. Our generalization method can be applied to any correlated binomial default distribution model which has explicit relations to the conditional default probabilities or conditional default correlations, e.g. Credit Risk${}^{+}$, implied default distributions. We also compare some popular CDO pricing models from the viewpoint of the range of the implied tranche correlation.Comment: 29 pages, 17 figures and 1 tabl

Correlation Structures of Correlated Binomial Models and Implied Default Distribution

We show how to analyze and interpret the correlation structures, the conditional expectation values and correlation coefficients of exchangeable Bernoulli random variables. We study implied default distributions for the iTraxx-CJ tranches and some popular probabilistic models, including the Gaussian copula model, Beta binomial distribution model and long-range Ising model. We interpret the differences in their profiles in terms of the correlation structures. The implied default distribution has singular correlation structures, reflecting the credit market implications. We point out two possible origins of the singular behavior.Comment: 16 pages, 7 figure