2,208 research outputs found

    The Birth of Capitalism

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    In the light of the deepening crisis of capitalism and continued non-Western capitalist accumulation, Henry Heller re-examines the debates surrounding the transition from feudalism to capitalism in Europe and elsewhere. Focusing on arguments about the origin, nature and sustainability of capitalism, Heller offers a new reading of the historical evidence and a critical interrogation of the transition debate. He advances the idea that capitalism must be understood as a political as well as an economic entity. This book breathes new life into the scholarship, taking issue with the excessively economistic approach of Robert Brenner, which has gained increasing support over the last ten years. It concludes that the future of capitalism is more threatened than ever before. The new insights in this book make it essential reading for engaged students and scholars of political economy and history

    A New Mechanism for Radial Migration in Galactic Disks: Spiral-Bar Resonance Overlap

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    While it has long been known that a large number of short-lived transient spirals can cause stellar migration, here we report that another mechanism is also effective at mixing disks of barred galaxies. The resonance overlap of the bar and spiral structure induces a nonlinear response leading to a strong redistribution of angular momentum in the disk. We find that, depending on the amplitudes of the perturbers, the changes in angular momentum, dL, could occur up to an order of magnitude faster than in the case of recurrent spirals. The signature of this mechanism is a bimodality in dL with maxima near the bar's corotation and its outer Lindblad resonance; this is independent of the properties of the spiral structure. For parameters consistent with the Milky Way the disk mixes in about 3 Gyr and the stellar velocity dispersion increases with time in a manner roughly consistent with observations. This new mechanism could account for both the observed age-velocity relation and the absence of age-metallicity relation in the solar neighborhood. Spiral-bar interaction could also explain observations showing that strongly barred galaxies have weaker metallicity gradients than weakly barred or non-barred galaxies.Comment: 10 pages, 7 figures. Substantially expanded. Main results remain the same. Accepted for publication in Ap

    The Nainital-Cape Survey -- II:Report for pulsation in five chemically peculiar A-type stars and presentation of 140 null results

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    To search photometric variability in chemically peculiar A type stars in the northern hemisphere. High-speed photometric observations of Ap and Am star candidates have been carried out from ARIES (Manora Peak, Nainital) using a three-channel fast photometer attached to the ARIES 104-cm Sampurnanand telescope. This paper presents three new variables: HD 113878, HD 118660 and HD 207561. During the time span of the survey (1999 December to 2004 January) pulsations of the δ\delta Sct type were also found for the two evolved Am stars HD 102480 and HD 98851, as reported in Joshi et al. (2002, 2003). Additionally, we present 140 null results of the survey for this time span. The star HD 113878 pulsates with a period of 2.31 hr, which is typical of δ\delta Sct stars. HD 118660 exhibits multi-periodic variability with a prominent period of nearly 1 hr. These periods need to be investigated and make HD 118660 a particularly interesting target for further observations. For HD 207561, a star classified as Am, a probable pulsation with a period of 6 min was found in the light curves obtained on two consecutive nights. Both HD 102480 and HD 98851 exhibit unusual alternating high and low amplitude maxima, with a period ratio of 2:1. The analysis of the null results confirms the photometric quality of the NainitalComment: 14 pages, 13 figures, Accepted for publication in A&

    The Dutchman Vol. 6, No. 2

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    â—Ź Spatterware â—Ź That\u27s a Lot of Boloney â—Ź A Dutch Touch â—Ź Birds in Dutchland â—Ź Cornelius Weygandt Day â—Ź Brick-end Barns â—Ź Hardly Bigger Than a Peanut â—Ź Pennsylvania Dutch Pioneers â—Ź Sycamores in Dutchland â—Ź The Zehn-uhr Schtickhttps://digitalcommons.ursinus.edu/dutchmanmag/1001/thumbnail.jp

    Mining and analysis of audiology data to find significant factors associated with tinnitus masker

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    Objectives: The objective of this research is to find the factors associated with tinnitus masker from the literature, and by using the large amount of audiology data available from a large NHS (National Health Services, UK) hearing aid clinic. The factors evaluated were hearing impairment, age, gender, hearing aid type, mould and clinical comments. Design: The research includes literature survey for factors associated with tinnitus masker, and performs the analysis of audiology data using statistical and data mining techniques. Setting: This research uses a large audiology data but it also faced the problem of limited data for tinnitus. Participants: It uses 1,316 records for tinnitus and other diagnoses, and 10,437 records of clinical comments from a hearing aid clinic. Primary and secondary outcome measures: The research is looking for variables associated with tinnitus masker, and in future, these variables can be combined into a single model to develop a decision support system to predict about tinnitus masker for a patient. Results: The results demonstrated that tinnitus maskers are more likely to be fit to individuals with milder forms of hearing loss, and the factors age, gender, type of hearing aid and mould were all found significantly associated with tinnitus masker. In particular, those patients having Age<=55 years were more likely to wear a tinnitus masker, as well as those with milder forms of hearing loss. ITE (in the ear) hearing aids were also found associated with tinnitus masker. A feedback on the results of association of mould with tinnitus masker from a professional audiologist of a large NHS (National Health Services, UK) was also taken to better understand them. The results were obtained with different accuracy for different techniques. For example, the chi-squared test results were obtained with 95% accuracy, for Support and Confidence only those results were retained which had more than 1% Support and 80% Confidence. Conclusions: The variables audiograms, age, gender, hearing aid type and mould were found associated with the choice of tinnitus masker in the literature and by using statistical and data mining techniques. The further work in this research would lead to the development of a decision support system for tinnitus masker with an explanation that how that decision was obtained

    The Dutchman Vol. 6, No. 1

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    â—Ź Editorial â—Ź Somerset County Decorated Barns â—Ź Butter Molds â—Ź Restaurants, too, Go Dutch â—Ź The Hostetter Fractur Collection â—Ź Bindnagle\u27s Church â—Ź The Harry S. High Folk Art Collection â—Ź Lebanon Valley Date Stones â—Ź Of Bells and Bell Towers â—Ź John Durang, the First Native American Dancer â—Ź Stoffel Rilbps\u27 Epistle â—Ź The First Singing of Our National Anthem â—Ź Pennsylvania Dutch Pioneershttps://digitalcommons.ursinus.edu/dutchmanmag/1000/thumbnail.jp
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