"Look like the innocent flower, but be the serpent under't": Mimicking behaviour of growth-oriented terrorist organizations

This paper examines the interaction between a growth-oriented terrorist organization and an uninformed government based on a two-period signaling game. The terrorists, taking into account the government's counter-terrorism response to first period attacks, gain additional manpower from successful attacks and choose their strategy to maximize the available manpower at the end of period 2. The government tries to infer the terrorist organization's size from the terrorists' attack choice it observes in period 1 and adjusts its second period counter-terrorism spending according to the perceived threat of terrorism. Combining the signaling game and organizational growth approaches of previous contributions, this paper shows that, if a terrorist group follows a growth strategy, it has an incentive to appear weaker than it is by mimicking the behaviour of a smaller organization. Furthermore, depending on its beliefs about the extent of the terrorist threat it can be optimal for a government to spend more on second period counter-terrorism measures if it is not attacked than if it were attacked. The behaviour of contemporary terrorist groups suggests that the assumptions of a growth strategy and mimicking behaviour are justified

The Influence of Altruistic Preferences on the Race to the Bottom of Welfare States

Common tax competition models suggest that welfare states will undercut each other's tax rate to attract taxpayers and keep welfare recipients at bay. This will lead to a zero-taxation outcome in the absence of migration costs or other barriers to migration. This paper develops a two-country framework with mobile altruistic taxpayers and immobile welfare recipients. It shows that under the assumption of taxpayers motivated by warm glow altruism, tax competition leads to unique pure strategy Nash equilibria in taxation which are different from zero given sufficiently strong altruistic preferences. If countries are asymmetric with respect to the number of welfare recipients, pure altruism and inequity aversion preferences support additional unique pure strategy Nash equilibria in which the country with the fewer poor attracts more taxpayers and sets higher taxes. This implies that rich countries may benefit from tax competition

Framework and baseline examination of the German National Cohort (NAKO)

The German National Cohort (NAKO) is a multidisciplinary, population-based prospective cohort study that aims to investigate the causes of widespread diseases, identify risk factors and improve early detection and prevention of disease. Specifically, NAKO is designed to identify novel and better characterize established risk and protection factors for the development of cardiovascular diseases, cancer, diabetes, neurodegenerative and psychiatric diseases, musculoskeletal diseases, respiratory and infectious diseases in a random sample of the general population. Between 2014 and 2019, a total of 205,415 men and women aged 19–74 years were recruited and examined in 18 study centres in Germany. The baseline assessment included a face-to-face interview, self-administered questionnaires and a wide range of biomedical examinations. Biomaterials were collected from all participants including serum, EDTA plasma, buffy coats, RNA and erythrocytes, urine, saliva, nasal swabs and stool. In 56,971 participants, an intensified examination programme was implemented. Whole-body 3T magnetic resonance imaging was performed in 30,861 participants on dedicated scanners. NAKO collects follow-up information on incident diseases through a combination of active follow-up using self-report via written questionnaires at 2–3 year intervals and passive follow-up via record linkages. All study participants are invited for re-examinations at the study centres in 4–5 year intervals. Thereby, longitudinal information on changes in risk factor profiles and in vascular, cardiac, metabolic, neurocognitive, pulmonary and sensory function is collected. NAKO is a major resource for population-based epidemiology to identify new and tailored strategies for early detection, prediction, prevention and treatment of major diseases for the next 30 years. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1007/s10654-022-00890-5

Röntgenspektroskopische Untersuchung der chemischen Bindung in Oxiden

This paper reports about the fine structure in the O—K-spectra of the oxides BeO, MgO, CaO, SrO, BaO, Sc2O5, Y2O3, La2O3, Sm2O3, Yb2O3, NiO and ZnO. The spectra show the satellite lines α3, α4, α5, α6 on the short wavelength side of the main line α1,2 and a shoulder β′ on its long wavelength side. The wavelengths of all lines depend on the nature of the oxide. For the positions of the lines Kα1.2 in the spectra no systematic relation to other data of the oxides is observed. On the other hand the distance of the a4-satellite from the α1,2-line decreases with increasing electronegativity of the metal atom in the oxide. This distance can be used as a measure for the ionic character of the metal-oxygen bond in these compounds

Attosecond spectroscopy in condensed matter

Cavalieri AL, Müller N, Uphues T, et al. Attosecond spectroscopy in condensed matter. Nature. 2007;449(7165):1029-1032.Comprehensive knowledge of the dynamic behaviour of electrons in condensed-matter systems is pertinent to the development of many modern technologies, such as semiconductor and molecular electronics, optoelectronics, information processing and photo-voltaics. Yet it remains challenging to probe electronic processes, many of which take place in the attosecond (1 as = 10(-18) s) regime. In contrast, atomic motion occurs on the femtosecond (1 fs = 10(-15) s) timescale and has been mapped in solids in real time(1,2) using femtosecond X-ray sources(3). Here we extend the attosecond techniques(4,5) previously used to study isolated atoms in the gas phase to observe electron motion in condensed-matter systems and on surfaces in real time. We demonstrate our ability to obtain direct time-domain access to charge dynamics with attosecond resolution by probing photoelectron emission from single-crystal tungsten. Our data reveal a delay of approximately 100 attoseconds between the emission of photoelectrons that originate from localized core states of the metal, and those that are freed from delocalized conduction-band states. These results illustrate that attosecond metrology constitutes a powerful tool for exploring not only gas-phase systems, but also fundamental electronic processes occurring on the attosecond timescale in condensed-matter systems and on surfaces