894,189 research outputs found

    RXTE Observations of 1A 1744-361: Correlated Spectral and Timing Behavior

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    We analyze Rossi X-ray Timing Explorer (RXTE) Proportional Counter Array (PCA) data of the transient low mass X-ray binary (LMXB) system 1A 1744-361. We explore the X-ray intensity and spectral evolution of the source, perform timing analysis, and find that 1A 1744-361 shows `atoll' behavior during the outbursts. The color-color diagram indicates that this LMXB was observed in a low intensity spectrally hard (low-hard) state and in a high intensity `banana' state. The low-hard state shows a horizontal pattern in the color-color diagram, and the previously reported `dipper QPO' appears only during this state. We also perform energy spectral analyses, and report the first detection of broad iron emission line and iron absorption edge from 1A 1744-361.Comment: 20 pages, 4 tables, 4 figures, accepted for publication in Ap

    Libertarianism With a Twist

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    Review of SIMPLE RULES FOR A COMPLEX WORLD. By Richard A. Epstein. Cambridge: Harvard University Press. 1995. Pp. xiv, 361

    Social support for and through exercise and sport in a sample of men with serious mental illness.

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    Social support is important for people experiencing serious mental illness and is also important during the initiation and maintenance of exercise. In this article we draw on interpretive research into the experiences of 11 men with serious mental illness to explore four dimensions of social support both for and through exercise. Our findings suggest that informational, tangible, esteem, and emotional support were both provided for and given by participants through exercise. We conclude that experiences of both receiving and giving diverse forms of support in this way are significant for some people living with and recovering from serious mental illness

    Endogenous retrovirusesin MS

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    Kinematic dynamo action in a sphere. I. Effects of differential rotation and meridional circulation on solutions with axial dipole symmetry

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    A sphere containing electrically conducting fluid can generate a magnetic field by dynamo action, provided the flow is sufficiently complicated and vigorous. The dynamo mechanism is thought to sustain magnetic fields in planets and stars. The kinematic dynamo problem tests steady flows for magnetic instability, but rather few dynamos have been found so far because of severe numerical difficulties. Dynamo action might, therefore, be quite unusual, at least for large-scale steady flows. We address this question by testing a two-parameter class of flows for dynamo generation of magnetic fields containing an axial dipole. The class of flows includes two completely different types of known dynamos, one dominated by differential rotation (D) and one with none. We find that 36% of the flows in seven distinct zones in parameter space act as dynamos, while the remaining 64% either fail to generate this type of magnetic field or generate fields that are too small in scale to be resolved by our numerical method. The two previously known dynamo types lie in the same zone, and it is therefore possible to change the flow continuously from one to the other without losing dynamo action. Differential rotation is found to promote large-scale axisymmetric toroidal magnetic fields, while meridional circulation (M) promotes large-scale axisymmetric poloidal fields concentrated at high latitudes near the axis. Magnetic fields resembling that of the Earth are generated by D > 0, corresponding to westward flow at the surface, and M of either sign but not zero. Very few oscillatory solutions are found

    Caspian oil in global context

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    This paper provides a brief overview of the political economy of Caspian oil. It begins by situating the Caspian region’s oil sectors in the larger global market, before proceeding to examine the ways in which the Azerbaijani, Turkmen and Kazakh oil sectors have been organised and governed since 1991. The paper then considers the likely consequences of recent policy shifts in Kazakhstan, the region’s most important oil producer. A further section considers the questions of transport infrastructure and export routes, which remain particularly complex problems for Central Asia’s landlocked producers. This is followed by a brief conclusion. The paper’s central argument is that it is by no means certain that the Caspian region’s hydrocarbon potential will be developed in a timely, economically efficient way

    The Físchlár-News-Stories system: personalised access to an archive of TV news

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    The “Físchlár” systems are a family of tools for capturing, analysis, indexing, browsing, searching and summarisation of digital video information. Físchlár-News-Stories, described in this paper, is one of those systems, and provides access to a growing archive of broadcast TV news. Físchlár-News-Stories has several notable features including the fact that it automatically records TV news and segments a broadcast news program into stories, eliminating advertisements and credits at the start/end of the broadcast. Físchlár-News-Stories supports access to individual stories via calendar lookup, text search through closed captions, automatically-generated links between related stories, and personalised access using a personalisation and recommender system based on collaborative filtering. Access to individual news stories is supported either by browsing keyframes with synchronised closed captions, or by playback of the recorded video. One strength of the Físchlár-News-Stories system is that it is actually used, in practice, daily, to access news. Several aspects of the Físchlár systems have been published before, bit in this paper we give a summary of the Físchlár-News-Stories system in operation by following a scenario in which it is used and also outlining how the underlying system realises the functions it offers

    Are labour relations and leadership styles significantly associated? An empirical study in ten manufacturing firms in Sri Lanka

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    It was theoretically argued that Labour Relations (LR) and leadership styles of managers were associated. An empirical study was conducted to test whether the variable of leadership style of managers was significantly associated with the variable of LR in manufacturing firms in Sri Lanka. The study was conducted in ten Sri Lanka manufacturing firms, which were listed unionised companies. The unit of analysis of this study were manager. The results indicated that leadership styles of managers and LR were not significantly associated suggesting that LR is independent of leadership styles of managers in the manufacturing firms studied in Sri Lanka
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