Conformational phase diagram for polymers adsorbed at ultrathin nanowires

We study the conformational behavior of a polymer adsorbed at an attractive nanostring and construct the complete structural phase diagram in dependence of the binding strength and effective thickness of the string. For this purpose, Monte Carlo optimization techniques are employed to identify lowest-energy structures for a coarse-grained hybrid polymer-wire model. Among the representative conformations in the different phases are, for example, compact droplets attached to the string and also nanotube-like monolayer films wrapping the string in a very ordered way. We here systematically analyze low-energy shapes and structural order parameters to elucidate the transitions between the structural phases

Thermodynamics of tubelike flexible polymers

In this work we present the general phase behavior of short tubelike flexible polymers. The geometric thickness constraint is implemented through the concept of the global radius of curvature. We use sophisticated Monte Carlo sampling methods to simulate small bead-stick polymer models with Lennard-Jones interaction among non-bonded monomers. We analyze energetic fluctuations and structural quantities to classify conformational pseudophases. We find that the tube thickness influences the thermodynamic behavior of simple tubelike polymers significantly, i.e., for given temperature, the formation of secondary structures strongly depends on the tube thickness

Structural Arrangements of Polymers Adsorbed at Nanostrings

We study ground states of a hybrid system consisting of a polymer and an attractive nanowire by means of computer simulations. Depending on structural and energetic properties of the substrate, we find different adsorbed polymer conformations, amongst which are spherical droplets attached to the wire and monolayer tubes surrounding it. We construct the complete conformational phase diagram and analyze in more detail particularly interesting polymer-tube conformations.Comment: Proceedings of the 23nd Workshop on Recent Developments in Computer Simulation Studies in Condensed Matter Physics, Feb 22-26, 2010, Athens, Georgia, US

Labor Market Entry Conditions, Wages and Job Mobility

Economic conditions at the time of labour market entry can induce wage differentials between workers entering the labour market at different points in time. While the existence and persistence of these entry wage differentials are well documented, little is known about their interaction with employees' mobility behaviour. This paper contributes to this research area by analyzing the interaction between job mobility and entry wage differentials using German administrative data. The results suggest that labour market entrants earning less than the average starting wage are more likely to change jobs, directly from employer to employer as well as indirectly via an unemployment spell. In addition they are more likely to change occupation. Moreover, job mobility tends to reduce the effects of labour market entry conditions, implying that job mobility operates as an adjustment mechanism that mitigates entry wage differentials. These results hold not only for high-skilled, but also for medium-skilled and unskilled workers.mobility, job-to-job, wages, labour market entry, initial conditions

Accurate modeling approach for the structural comparison between monolayer polymer tubes and single-walled nanotubes

In a recent computational study, we found highly structured ground states for coarse-grained polymers adsorbed to ultrathin nanowires in a certain model parameter region. Those tubelike configurations show, even at a first glance, exciting morphological similarities to known atomistic nanotubes such as single-walled carbon nanotubes. In order to explain those similarities in a systematic way, we performed additional detailed and extensive simulations of coarse-grained polymer models with various parameter settings. We show this here and explain why standard geometrical models for atomistic nanotubes are not suited to interpret the results of those studies. In fact, the general structural behavior of polymer nanotubes, as well as specific previous observations, can only be explained by applying recently developed polyhedral tube models.Comment: Proceedings of the 24th Workshop on Recent Developments in Computer Simulation Studies in Condensed Matter Physics, Feb 21-25, 2011, Athens, Georgia, US

Psychische Verletzungen durch organisationale Veränderungen – ein Gestalt-Coaching-Ansatz

Kränkungserleben durch organisationale Veränderungen hat oft tiefe Auswirkungen auf das Selbstvertrauen. Eine mögliche Hypothese besteht darin, dass in Organisationen Entscheidungen für Individuen oft irrational und willkürlich erscheinen. Führungskräfte reagieren in dieser Situation oft mit Kontaktabbruch, was als extreme Form der Kontaktregulation angesehen werden kann. Coaching mit gekränkten und frustrierten Führungskräften stellt eine Herausforderung dar: Für den Klienten kann es ein sehr emotionaler und tiefgreifender und für den Coach ein anspruchsvoller und langwieriger Prozess werden, bis sich Erfolge einstellen. In diesem Artikel wird ein Gestalt-Ansatz für den Umgang mit gekränkten Klienten vorgeschlagen, der sich am Kontaktzyklus aus der Gestalttherapie orientiert.Humboldt-Universität zu Berlin (1034)Peer Reviewe

Labour Market Entry Conditions, Wages and Job Mobility

Economic conditions at the time of labour market entry can induce wage differentials between workers entering the labour market at different points in time. While the existence and persistence of these entry wage differentials are well documented, little is known about their interaction with employees’ mobility behaviour. This paper contributes to this research area by analyzing the interaction between job mobility and entry wage differentials using German administrative data. The results suggest that labour market entrants earning less than the average starting wage are more likely to change jobs, directly from employer to employer as well as indirectly via an unemployment spell. In addition they are more likely to change occupation. Moreover, job mobility tends to reduce the effects of labour market entry conditions, implying that job mobility operates as an adjustment mechanism that mitigates entry wage differentials. These results hold not only for high-skilled, but also for medium-skilled and unskilled workers.Mobility; job-to-job; wages; labour market entry; initial conditions