4,268 research outputs found

    Ties of resistance and cooperation: Aedemon, Lusius Quietus and the Baquates

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    Gaius' decision to dissolve the protectorate of Mauretania and to depose its client king, Ptolemaeus, led to the outbreak of the Revolt of Aedemon (AD 40). This paper will develop a number of innovative thoughts and hypotheses concerning the extent of this rebellion and its possible impact on the deposition of Ptolemaeus, as well as the role of the Romans in its suppression. The main aim is to explore the connection between this revolt, Trajanus' famous general Lusius Quietus (cos. AD 117?), and the Baquates, an indigenous Mauretanian tribe. I will suggest that Lusius Quietus was descended from a chief of a (semi-)nomadic tribe who supported the Roman cause during the Revolt of Aedemon. Considering the setting and dimension of this revolt, as well as the unrest in Mauretania at the time of Lusius Quietus' execution by Hadrianus, I argue that this tribe can be identified as the Baquates. This reconstruction suggests a long-lasting and particularly positive relationship between this tribe and Rome. It allows for a further reconsideration of the relationship between (semi-)nomadic and Roman/sedentary groups in Roman North Africa, to the detriment of one-sided analytical schemes that stress endemic hostility

    Comparison of Polar Decoders with Existing Low-Density Parity-Check and Turbo Decoders

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    Polar codes are a recently proposed family of provably capacity-achieving error-correction codes that received a lot of attention. While their theoretical properties render them interesting, their practicality compared to other types of codes has not been thoroughly studied. Towards this end, in this paper, we perform a comparison of polar decoders against LDPC and Turbo decoders that are used in existing communications standards. More specifically, we compare both the error-correction performance and the hardware efficiency of the corresponding hardware implementations. This comparison enables us to identify applications where polar codes are superior to existing error-correction coding solutions as well as to determine the most promising research direction in terms of the hardware implementation of polar decoders.Comment: Fixes small mistakes from the paper to appear in the proceedings of IEEE WCNC 2017. Results were presented in the "Polar Coding in Wireless Communications: Theory and Implementation" Worksho

    Thermodynamic and turbomachinery concepts for radioisotope and reactor brayton-cycle space power systems

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    Thermodynamic and turbomachinery concepts for low power radioisotope and intermediate power reactor Brayton cycle systems - examination of intercooling and reheating effect

    Theoretical approach to labyrinth seal forces - cross-coupled stiffness of a straight-through labyrinth seal

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    Two kinds of three dimensional flows in a labyrinth seal, a jet flow and a core flow, are considered and theoretical equations are set up concerning the motion of each flow. The pressure distribution within the labyrinth is calculated, when the rotor shaft makes a small displacement from the center line of the casing, keeping parallel with it. The theoretical values of cross coupled stiffness obtained by integrating the pressure under different labyrinth geometries and operating conditions through these formulas are compared with the experimental data

    A Smart Modular Wireless System for Condition Monitoring Data Acquisition

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    Smart sensors, big data, the cloud and distributed data processing are some of the most interning changes in the way we collect, manage and treat data in recent years. These changes have not significantly influenced the common practices in condition monitoring for shipping. In part this is due to the reduced trust in data security, data ownership issues, lack of technological integration and obscurity of direct benefit. This paper presents a method of incorporating smart sensor techniques and distributed processing in data acquisition for condition monitoring to assist decision support for maintenance actions addressing these inhibitors

    Molar macrowear reveals Neanderthal eco-geographic dietary variation

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    Neanderthal diets are reported to be based mainly on the consumption of large and medium sized herbivores, while the exploitation of other food types including plants has also been demonstrated. Though some studies conclude that early Homo sapiens were active hunters, the analyses of faunal assemblages, stone tool technologies and stable isotopic studies indicate that they exploited broader dietary resources than Neanderthals. Whereas previous studies assume taxon-specific dietary specializations, we suggest here that the diet of both Neanderthals and early Homo sapiens is determined by ecological conditions. We analyzed molar wear patterns using occlusal fingerprint analysis derived from optical 3D topometry. Molar macrowear accumulates during the lifespan of an individual and thus reflects diet over long periods. Neanderthal and early Homo sapiens maxillary molar macrowear indicates strong eco-geographic dietary variation independent of taxonomic affinities. Based on comparisons with modern hunter-gatherer populations with known diets, Neanderthals as well as early Homo sapiens show high dietary variability in Mediterranean evergreen habitats but a more restricted diet in upper latitude steppe/coniferous forest environments, suggesting a significant consumption of high protein meat resources

    Spatially-Coupled Precoded Rateless Codes with Bounded Degree Achieve the Capacity of BEC under BP decoding

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    Raptor codes are known as precoded rateless codes that achieve the capacity of BEC. However the maximum degree of Raptor codes needs to be unbounded to achieve the capacity. In this paper, we prove that spatially-coupled precoded rateless codes achieve the capacity with bounded degree under BP decoding

    Innovation Management in Electrotechnology in the USSR

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    This working paper is one small part of IIASA's effort to study innovation in a comparative way. Dr. B.I. Fomin, Director, Electrosila Corporation*, Leningrad, and Dr. A.G. Medvedev, Leningrad Institute for Engineering Economics**, wrote the paper, which is a complement to WP-87-54, written by T.H. Lee and R.L. Loftness, on electrotechnology innovation in the USA. Dr. Fomin and Dr. Medvedev describe the role of electrotechnology in Soviet industry, and the peculiarities of its innovation environment. They illustrate that even in a maturing industry such as electrotechnology, there are strong movements in traditional product and process innovation, but also, that major effects, from new evolutionary and revolutionary changes, are being felt. The latter is caused by progress in such areas as flexible manufacturing, CAD, and materials research, including new discoveries in superconductivity. Electrotechnology, in general, and Electrosila, in particular, is now playing a significant role in testing the elements of new economic reform being implemented at present in the Soviet Union. This reform strives to incorporate several new concepts into their industrial management systems. The most important among them are the specific requirements of customers (users), and technological changes brought about by domestic and foreign research and development as well as the traditional goals derived from the needs of further development of the national economy. Inside the production system, new incentives for increased efficiency and effectiveness are being tested. This paper is certain to be of interest to those studying the changing way industry is being managed in the Soviet Union as a consequence of the restructuring program, including the problems faced and the search for solutions. Other collaborative activities related to innovation management in socialist countries are described in Lundstedt and Moss, WPS-87-89
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