260 research outputs found

    Pleistocene hares from the East Siberian Arctic (Lagomorpha, Leporidae)

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    Isolated fossil hare bones from seven Pleistocene localities in the east Siberian Arctic are attributed to Lepus tanaiticus vereschagini Averianov, 1995 (Mamontovaya Khayata) and to L. tanaiticus subsp. indet. (other localities)

    The stem placental mammal Prokennalestes from the Early Cretaceous of Mongolia

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    © 2017, Pleiades Publishing, Ltd. All materials, including upper and lower jaw fragments and isolated teeth, of two closely related species of the stem placental mammal Prokennalestes, P. minor Kielan-Jaworowska et Dashzeveg, 1989 (258 specimens) and P. trofimovi Kielan-Jaworowska et Dashzeveg, 1989 (251 specimens), from the type locality of Khovoor (Early Cretaceous of Mongolia) are described. These extensive materials allow for the first time the study of morphological and size variability in an Early Cretaceous mammal. Prokennalestes can be diagnosed by the dental formula I?/4, C1/1, P4–5/5, M3/3, presence of the Meckelian groove, the mandibular foramen positioned dorsally on a prominent longitudinal ridge, presence of the masseteric foramen, double-rooted and premolariform lower canine, submolariform P5 with a large protocone and minute metacone, presence of the preparastyle, cusplike postmetacrista, and cusplike conules with incipient conular cristae on the upper molars, premolariform p5, the protoconid distinctly higher than the metaconid, the paraconid and metaconid connate at the base, transverse protocristid, and presence of distal metacristid on the lower molars. Two Prokennalestes species are reliably distinguished by the tooth dimensions (P. minor is smaller by 20%), the position of the infraorbital foramen (under P4 in P. minor and between P4 and P5 or under P5 in P. trofimovi), the presence of protoconal swelling on P4 (usually absent in P. minor and usually present in P. trofimovi), the ectocingulum extension in M3 (longer in P. minor), position of the posterior end of the mandibular symphysis (under p2 in P. minor, under p2–p3 in P. trofimovi), and by the position of the posterior mental foramen (under p4 in P. minor and under p5 in P. trofimovi). Taking into account considerable morphological differences between the two samples, they are regarded as different species rather than sexual morphs of the same species. Prokennalestes is a basal eutherian mammal similar in phylogenetic position to other stem placentals (Eomaia, Murtoilestes, Bobolestes, Aspanlestes). A more exact phylogenetic position of Prokennalestes can be established based on rigorous phylogenetic analysis including a large set of known stem therian and stem placental taxa.

    The oldest record of Alvarezsauridae (Dinosauria: Theropoda) in the Northern Hemisphere

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    © 2017, Public Library of Science. All rights reserved. This is an open access article, free of all copyright, and may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose. The work is made available under the Creative Commons CC0 public domain dedication. Procoelous caudal vertebrae, a carpometacarpus with a hypertrophied metacarpal II, and robust proximal and ungual phalanges of manual digit II of a small theropod dinosaur from the Upper Cretaceous (Turonian) Bissekty Formation at Dzharakuduk, Uzbekistan, show unequivocal synapomorphies of the clade Alvarezsauridae and thus are referred to it. The caudal vertebrae have a unique longitudinal canal within the neural arch. The carpometacarpus, with metacarpal III occupying about one third of the width of the carpometacarpus, shows the most plesiomorphic stage of the evolution of the forelimb among known alvarezsaurids. The proximal phalanx of manual digit II differs from the corresponding bone in Parvicursorinae in having a less asymmetrical proximal articular surface without a dorsal process and short ventral ridges. The ungual phalanx of manual digit II has laterally open ventral foramina. The Bissekty alvarezsaurid possibly represents a basal parvicursorine and is the stratigraphically oldest known alvarezsaurid in Asia known to date

    Formulation of development strategies of machinery building complex enterprises and estimation of their implementation efficiency

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    The paper determines and analyzes basic contradicitons in the development of science-intensive machinery building complex of Russia. Special attention is paid to the analysis of lifecycle phases of a machinery building enterprise and its modification of condition of the development and implementation of the innovation-focused strategy. It suggest a methodology of integral estimation of the manufacturing enterpise development with the use of tempo coefficients that allows to define and estimate the influence of the most significant factors on the enteprise development as well as to rate enterprises according to the level and potential of development. © IDOSI Publications, 2013

    Development of science-intensive strategy in machinery-building company in contemporary Russia

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    The paper suggests a system of science-intensive strategy of machinery building company developed for different hierarchical levels: within microlevel it is considered to be growth rate of revenue obtained as a result of investment; on macrolevel it is considered to be qualitative and quantitative growth of the capital functioning in the society, efficient use of investment resources, creation and protecting favorable investment climate. © IDOSI Publications, 2013

    An Ichthyornis-like bird from the earliest Late Cretaceous (Cenomanian) of European Russia

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    © 2017 Elsevier LtdOrnithuromorph birds (the clade which includes modern avian radiation) first appeared in the Early Cretaceous in Asia and achieved a great diversity during the latest ages of the Late Cretaceous (Campanian and Maastrichtian). The evolutionary history of orithuromorphs during the first 17 MYAs of the Late Cretaceous (Cenomanian to Santonian ages) remains very poorly known, as the fossil record for this time interval is largely restricted to several isolated finds of the classic avian genus Ichthyornis in North America. Here we describe an isolated distal tibiotarsus of an evolutionary advanced bird, morphologically similar to Ichthyornis, from the middle Cenomanian of Saratov Province, European Russia. This is the first documentation of an Ichthyornis-like bird in the Old World. The find further constitutes only the second pre-Campanian record of the Late Cretaceous Ornithuromorpha in Eurasia, the second record of Cenomanian birds in Russia. This discovery shows that Ichthyornis-like birds enjoyed a wide geographical distribution as early as the beginning of the Late Cretaceous. Given that the earliest and the most primitive ornithuromorph birds are known from Asia, the new find supports a Eurasian origin for Ichthyornithidae

    Development and implementation of adaptive science-intensive manufacture management system based on management processes automation

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    The paper substantiates theoretic and methodic basics and formulates practical recommendations related to the formation and development mechanism of the adaptive science-intensive manufacture management on the basis of the management processes automation. It is shown that, above all, the economic stability of the science-intensive manufacture is contemplated by the innovation stability, characterizing innovation strategy taking into account the flexibility and orientation of the innovation cycle implementation including the creative phase, phases of ratioanization and invention. © IDOSI Publications, 2013

    Development and implementation of manufacturing enterprise operative management system using risk management tools

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    Key risks of a manufacturing enterprise are defined in terms of sub-industries. In accordance with them the most considerable risks include investment risk for aircraft industry, organizational risk for machinery building, personnel risk for science-intensive machinery building, technical and process design risk for heavy engineering, commercial risk for consumer goods manufacturing, credit risk for food industry, ecological risk for mineral industry and anthropogenic risk for ecological industry. The algorithm of a manufacturing enterprise operative management on the basis of risk management including risks estimate module is worked out. © IDOSI Publications, 2013

    Formation and implementation implementation of comprehensive science-intensive informational system of an enterprise

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    The paper explains methodological approach to the formation and implementation of the comprehensive informational system of a science-driven enterprise based on the consideration of the interrelation of technological basis development levels, business processes and levels of informational technologies (IT) development. The analysis of the developed model shows that the efficiency of active changing of suppliers lineup increases if a relative range of suppliers offer prices oscillation and their characteristic period increase. © IDOSI Publications, 2013

    Anthracotheriid artiodactyl Anthracokeryx and an upper Eocene age for the Youganwo Formation of southern China

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    © 2017 Informa UK Limited, trading as Taylor & Francis Group The two recently collected mammalian dentary fragments from the Eocene Youganwo Formation of Guangdong Province, southern China, are referred to the anthracotheriid species Anthracokeryx naduongensis based on phylogenetic analysis and size comparison. One of these specimens (SYSU-M-1) is the first mammal fossil described from the Youganwo Formation. It was attributed previously to the perissodactyl genus Lunania. Anthracokeryx naduongensis was described originally from the lower upper Eocene Na Duong Formation in Northern Vietnam. The second record of this species supports a basal upper Eocene correlation for the Youganwo Formation, which was estimated previously as middle or late Eocene
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