A spatially resolved SSC Shock-in-Jet model

In this paper a spatially resolved, fully self-consistent SSC model is presented. The observable spectral energy distribution (SED) evolves entirely from a low energetic delta distribution of injected electrons by means of the implemented microphysics of the jet. These are in particular the properties of the shock and the ambient plasma, which can be varied along the jet axis. Hence a large variety of scenarios can be computed, e.g. the acceleration of particles via multiple shocks. Two acceleration processes, shock acceleration and stochastic acceleration, are taken into account. From the resulting electron distribution the SED is calculated taking into account synchrotron radiation, inverse Compton scattering (full cross section) and synchrotron self absorption. The model can explain SEDs where cooling processes are crucial. It can verify high variability results from acausal simulations and produce variability not only via injection of particles, but due to the presence of multiple shocks. Furthermore a fit of the data, obtained in the 2010 multi-frequency campaign of Mrk501, is presented.Comment: 4 pages, 2 figures; appeared in the proceedings of the conference: "High Energy Phenomena in Relativistic Outflows (HEPRO) III", held in Barcelona, Spain, June 27th-July 1st 2011 (IJMPCS

The radio morphology of a spatially resolved SSC model

One of the main, unresolved questions about the nature of quasars is the position of the acceleration site responsible for the highest energies. The attempt to investigate this question in the energy regime with the highest resolution, the radio band, has the downside that no theoretical model exists that can connect these two regimes. The model in this work tries to shrink this gap by extending the general synchrotron self Compton (SSC) model up to length scales in the order of the resolution of radio observations. The resulting spectral energy distributions (SED) show a qualitative improvement in the representation of the radio spectrum. Furthermore the obtained emission morphology shows similar properties to the radio structures observed in jets of quasars. A complete and quantitative connection will however need either much higher numerical effort or an improved methodology

Multi-band implications of external-IC flares

Very fast variability on scales of minutes is regularly observed in Blazars. The assumption that these flares are emerging from the dominant emission zone of the very high energy (VHE) radiation within the jet challenges current acceleration and radiation models. In this work we use a spatially resolved and time dependent synchrotron-self-Compton (SSC) model that includes the full time dependence of Fermi-I acceleration. We use the (apparent) orphan $\gamma$-ray flare of \textit{Mrk501} during MJD 54952 and test various flare scenarios against the observed data. We find that a rapidly variable external radiation field can reproduce the high energy lightcurve best. However, the effect of the strong inverse Compton (IC) cooling on other bands and the X-ray observations are constraining the parameters to rather extreme ranges. Then again other scenarios would require parameters even more extreme or stronger physical constraints on the rise and decay of the source of the variability which might be in contradiction with constraints derived from the size of the black hole's ergosphere.Comment: accepted for publication in Astroparticle Physic

What about the Women? Female Headship, Poverty and Vulnerability in Thailand and Vietnam

This paper investigates whether different types of female?headed households in Thailand and Vietnam are disadvantaged in terms of current consumption, exposure to shocks, consumption smoothing capacities, as well as vulnerability to poverty and downside risk. Using a unique panel data set of over 4000 rural households in both countries, we find that female headed households with an absent husband appear to be better off in terms of current consumption in both countries (suggesting a positive impact of remittances). However, de jure female headed households in Thailand and Vietnam are more exposed to shocks and are less able to insure their consumption against income shocks than other households. In line with this finding de jure female headed households are also more vulnerable to perceived downside risk. Instead, de facto female headed households are less vulnerable to poverty and not worse off in terms of vulnerability to perceived downside risk. --Poverty,Gender Analysis,Vulnerability to Poverty,Inter?generational Poverty

A locally conservative reduced flux reconstruction for elliptic problems

In the context of model order reduction of parametric elliptic problems, we present a methodology to reconstruct a conforming flux from a given reduced solution, that is locally conservative with respect to the underlying finite element grid. All components of the procedure depend separably on the parameter and allow for further use in offline/online decomposed computations, for instance in the context of a posterior error estimation or flow problems

Entwicklungsstufen des Unternehmensarchitekturmanagements

Zusammenfassungen: Je nach Ausgestaltung kann Unternehmensarchitekturmanagement (UAM) eine wichtige Komponente des strategischen IT-Managements bilden — oder auch nicht. Um die Ausgestaltungsmöglichkeiten besser zu verstehen, führen wir zunächst UAM-Dimensionen ein und beschreiben auf dieser Grundlage vier zentrale UAM-Entwick-lungsstufen, deren letzte >>strategisches UAM<< ist. Die vier Entwicklungsstufen ermöglichen dem Leser die Positionierung des jeweils realisierten UAM im eigenen Unternehmen sowie die Definition eines angemessenen Zielzustands. Drei Kurzfallstudien zeigen konkret auf, in welchen Variationen strategisches UAM umgesetzt und in welcher Weise dadurch strategisches Informationsmanagement unterstützt werden kan

Pharmacognostical Study of Dioscorea oppositifolia L.

Extraction of bioactive compounds from medicinal plants permits demonstration of their physiological activity. It also facilitates pharmacology studies leading to discovery of synthesis of more potent drugs. The plant selected in the present study is Dioscorea oppositifolia L. (Dioscoreaceae) which is used traditionally for antiseptics, ulcers and abscesses. The root is chewed to cure toothache and aphthae. The whole plant extract is used for secondary syphilis and Psorasis. The present investigation was intended to evaluate the preliminary phytochemical characters and fluorescence analysis of this species