Egaenus convexus - eine neue Weberknechtart aus der Tschechischen Republik

The harvestmen fauna of the Czech Republic is relatively species-poor; so far 29 species have been found, of them 23 in Bohemia, the western part of the country, and 26 species in Moravia, the eastern part of the Czech Republic

To Wet or Not to Wet? Dispersion Forces Tip the Balance for Water Ice on Metals

Despite widespread discussion, the role of van der Waals dispersion forces in wetting remains unclear. Here we show that nonlocal correlations contribute substantially to the water-metal bond and that this is an important factor in governing the relative stabilities of wetting layers and 3D bulk ice. Because of the greater polarizability of the substrate metal atoms, nonlocal correlations between water and the metal exceed those between water molecules within ice. This sheds light on a long-standing problem, wherein common density functional theory exchange-correlation functionals incorrectly predict that none of the low temperature experimentally characterized icelike wetting layers are thermodynamically stable

First Psychiatric Attendance in the Context of Life Events

In this study, the possibility that life events contribute to coming to psychiatric attention was empirically explored. The quantity and quality of life changes preceding first psychiatric attendance and intervening between the onset of complaints and subsequent attendance, was the main subject matter of this investigation. Fifty people first attending at a psychiatric service and thirty-nine normal matched controls were interviewed, in a standardized manner, about the changes occurring in their lives in the two years immediately preceding their first psychiatric consultation. The patients showed increased rate and severity of events, predominantly in the fifteen months immediately preceding their attendance. There was a gradual build-up of events over the time culminating just before the attendance itself. In the period between onset of each patient's complaints and his first psychiatric consultation, the patients still experienced, health changes apart, an excess of events in terms both of rate and severity of change. These changes were confined to the realm of 'marital and intimate' and 'personal and social' activities. The patients' social contacts were reduced. The quality of events in this period was best described as 'negative'. During that time the patients also reported an excess of events 'independent of their illness', which thus directly contributed to their attendance. The evidence on whether events accelerate attendance is not conclusive. Methodological issues arising from life-event research and the implications of life events for therapeutic action are also explored in the discussion

Confluence of singularities of non-linear differential equations via Borel--Laplace transformations

Borel summable divergent series usually appear when studying solutions of analytic ODE near a multiple singular point. Their sum, uniquely defined in certain sectors of the complex plane, is obtained via the Borel--Laplace transformation. This article shows how to generalize the Borel--Laplace transformation in order to investigate bounded solutions of parameter dependent non-linear differential systems with two simple (regular) singular points unfolding a double (irregular) singularity. We construct parametric solutions on domains attached to both singularities, that converge locally uniformly to the sectoral Borel sums. Our approach provides a unified treatment for all values of the complex parameter.Comment: 42 page

Injection of Highly Charged Ion Ensembles for Spectroscopy of Magnetic Interactions in the ARTEMIS Penning Trap

Quantum electrodynamics (QED) is the most precisely validated theory in modern physics, yet it remains mostly untested in the most extreme fields. In addition, atomic nuclei generate fields much stronger than can be made in even the most advanced laser and magnet facilities. Therefore, heavy highly charged ions (HCIs) present themselves as natural laboratories for investigating QED in strong fields. ARTEMIS is a Penning trap experiment designed for measurement of electron and nuclear magnetic moments in heavy HCIs using laser-microwave double-resonance (LMDR) spectroscopy. This technique enables measurement of magnetic moments in atomic systems with hyperfine structure, in which the transitions are often in the near ultraviolet (UV) regime such as hydrogenlike bismuth, 209Bi82+. Precision spectroscopy of such heavy, HCIs requires an exceedingly well isolated trapping environment with vacuum pressure better than 10−15 mbar. This work presents the implementation of the first ion trap capable of long-term storage of heavy HCIs with a residual gas pressure better than 2.4x10−16 mbar and with rapid cycle times as fast as 100 ms for irradiation with UV laser light, as well as the design of the corresponding injection beamline. The trapping conditions are verified by non-destructive monitoring of trapped HCIs over a few days, which were ultimately stored for about 2 weeks. The operation of such a fast-opening cryogenic valve (FCV) is essential to the LMDR technique for many heavy ion systems where excellent environmental conditions in the trapping region and direct line of sight for laser irradiation are required