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    Wyświetlanie 1-9 z 9
    Tytuł:
    The maximization of the ultimate recovery factor in mature gas reservoirs implementing wellhead and field compression
    Maksymalizacja współczynnika wydobycia w sczerpanych złożach gazu ziemnego z zastosowaniem kompresji
    Autorzy:
    Stefanescu, D.-P.
    Tataru, A.
    Rotar, D.
    Popa, A.-M.
    Powiązania:
    https://bibliotekanauki.pl/articles/300463.pdf
    Data publikacji:
    2008
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    eksploatacja
    gaz ziemny
    produkcja
    ciśnienie głowicowe
    exploitation
    natural gas
    production
    wellhead pressure
    Opis:
    Mature fields contribute more than 50% of the world's gas production and therefore it is necessary to understand and to optimize the performance of these reservoirs. The obvious decline of the natural gas reserves associated with relatively reduced volume of the new reserves discoveries, reclaim the implementation of a new technical-economical approach of the mature gas field. The final target is in fact, the extending the life of the reservoirs, in terms of increasing the ultimate recovery factor. One of the Romgaz concepts regarding this problem is to develop compression capacities close to the wells. Many gas wells can be subjected to increased production by reducing the wellhead pressure. By installing a compressor at the wellhead or in the field, the wellhead pressure can be reduced to increase the gas production and the ultimate recovery factor. These types of compressors are characterized by low to medium throughputs with low to medium compression ratios. The implementation of this method is imposed by production behavior of the semi-depleted Romgaz fields. The biggest advantages of this type of compression are represented by the installation low costs, a low maintenance, as well as a big flexibility at the working parameters' variation.
    Sczerpane złoża stanowią ponad 50% światowej produkcji gazu ziemnego, dlatego też konieczne staje się zrozumienie i optymalne wykorzystanie tych złóż. Konsekwentny spadek zasobów gazu ziemnego związany ze zmniejszającą się objętością odkrywanych złóż wymusza zastosowanie nowych podejść technologiczno-ekonomicznych. Ostatecznym celem badań jest wydłużenie żywotności złóż a tym samym podniesienie wartości jego wskaźnika wydobycia. Jednym z rozwiązań reprezentowanych przez Romgaz jest rozwinięcie zdolności kompresyjnych w otoczeniu otworu. W wielu otworach gazowych produkcję można zwiększyć przez obniżenie ciśnienia głowicowego. Po zainstalowaniu kompresora na głowicy lub na złożu, wartość ciśnienia może zmaleć zwiększając tym samym produkcję gazu ziemnego. Tego typu kompresory charakteryzują się średnią przepustowością i średnią bądź niską wartością współczynnika ściśliwości. Zastosowanie wymienionej metody zostało opracowane w wyniku obserwacji zachowania na wpół sczerpanych złóż gazowych Romgaz. Największą zaletą tego typu kompresji jest niski koszt instalacji, utrzymania jak i możliwość dostosowania do bardzo zmiennych parametrów roboczych.
    Źródło:
    Wiertnictwo, Nafta, Gaz; 2008, 25, 2; 659-665
    1507-0042
    Pojawia się w:
    Wiertnictwo, Nafta, Gaz
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An Early Jurassic braided river system from Mehadia, South Carpathians, Romania
    Autorzy:
    Kędzior, A.
    Popa, M. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059779.pdf
    Data publikacji:
    2018
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    sedimentology
    Lower Jurassic
    continental deposits
    Mehadia
    South Carpathians
    Romania
    Opis:
    The Lower Jurassic (Hettangian–Sinemurian) continental deposits of the Mehadia area (Caraş–Severin County) belong to the Presacina Basin, Upper Danubian Units of the South Carpathians, Romania. This un-named succession is exposed along large areas within the Greaţca Quarry where deposits of a complex braided river system can be seen. Nine clastic facies are identified within the Mehadia section and grouped into two facies associations reflecting two main sub-environments. (A) a fine-grained association, up to 6.5 m thick, composed of greyish black and dark grey massive and horizontally laminated mudstones interbedded with fine- to medium-grained sandstones showing ripple lamination, tabular low-angle large-scale cross-bedding and in some places massive sandstones. Within this association coarsening and fining-upward sequences are visible, while subordinate pensymmetrical-like sequences were observed. The sediments of the fine-grained association are interpreted as having been deposited along an alluvial plain from flood waters. The sandstone interbeds are interpreted as crevasse channel-fills and the thinner sandstone bodies as proximal crevasse splays. (B) a coarse-grained facies association represented by sandstones and conglomerates, both clast- and matrix-supported, from granule to pebble clast sizes. Almost all basal members of this association are underlain by erosional surfaces, while internal erosional surfaces occur at some levels. The coarse-grained facies association is interpreted as having been deposited within active river channels of a sandy braided river system. The occurrence of numerous erosional surfaces, the recurrence of the facies within this association (channel bodies), as well as the abundant mudstone and sandstone intraclasts all point to frequent conditions of erosion (including redeposition) of previously deposited sediments. The relatively low fine-grained sediment content (<25%) can be explained by two factors: (1) a creation rate for accommodation space was not enough for the accumulation of a large amount of overbank deposits; (2) a lack of larger quantities of fine-grained material being transported in the river system. Both factors may have operated independently or interacted.
    Źródło:
    Geological Quarterly; 2018, 62, 2; 415--432
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sedimentology of the Early Jurassic terrestrial Steierdorf Formation in Anina, Colonia Cehă Quarry, South Carpathians, Romania
    Autorzy:
    Kędzior, A.
    Popa, M. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/138766.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sedimentology
    Hettangian – Sinemurian
    alluvial and fluvial systems
    fossil flora and fauna
    Steierdorf Formation
    South Carpathians
    Romania
    sedymentologia
    synemur
    hettang
    systemy rzeczne i zalewowe
    fauna kopalna
    flora kopalna
    Formacja Steierdorf
    Karpaty
    Rumunia
    Opis:
    Authorship issues are clarified, new photographic documentation is provided and emended systematic descriptions are presented for the oldest Cambrian trilobite taxa from the Holy Cross Mountains (Poland). Biostratigraphic analysis of the fauna allows correlation with the traditional Holmia kjerulfi-group Zone of Scandinavia, the Callavia Zone of Britain and Newfoundland, the lower and middle part of the Sectigena Zone of Morocco and the Marianian Stage of Spain. The trilobites display a strong biogeographic signal linked with West Gondwana and Avalonia and a suggestion is made that the TESZ margin of Baltica with the Malopolska Massif was liable to currents from those areas that distributed planktonic trilobite larvae.
    Źródło:
    Acta Geologica Polonica; 2013, 63, 2; 175-199
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Self optimizing neural network - as expert system in medical heart attack.
    Autorzy:
    Popa, A.
    Wojczyk, S.
    Lizis, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/333471.pdf
    Data publikacji:
    2008
    Wydawca:
    Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
    Tematy:
    sieci neuronowe
    systemy eksperckie
    choroby serca
    neural network
    expert systems
    heart diseases
    Opis:
    The main aim of Self Optimizing Neural Network (SONN), which are presented in this paper, is construction of expert system on the basis of analysis of medical information about group of patients. The expert system is built on the basis of neural network, and the main task of this system is to expect future patient health, based on information about the patient. Such a system can give the doctors a hint about that what can be happen with patient. And what is more important - the SONN construction process is very flexibly and adapts topology and all weights to training data. This is undoubtedly a great advantage of this type of neural network. Moreover the construction process is quite simple. The network topology and all connections between neurons can be easy implemented and kept in such a way, which allows to create very efficient expert system. In this paper we describe the process of construction of neural network which is based on one-shot analysis of learning patterns. On the basis of appropriate computation the SONN topology is built. The construction process can be repeated on the learning group of patients. In this way the expert system (based on SONN) will be better and better.
    Źródło:
    Journal of Medical Informatics & Technologies; 2008, 12; 77-82
    1642-6037
    Pojawia się w:
    Journal of Medical Informatics & Technologies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Early Jurassic sauropod footprints of the Southern Carpathians, Romania: palaeobiological and palaeogeographical significance
    Autorzy:
    Pieńkowski, G.
    Popa, M. E.
    Kedzior, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059248.pdf
    Data publikacji:
    2009
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Parabrontopodus
    sauropods
    Romania
    Hettangian
    palaeobiogeography
    Opis:
    The dinosaur footprints cf. Parabrontopodus isp. Lockley, Farlow et Meyer, 1994, attributed to sauropods, have been found in Hettangian (earliest Jurassic) alluvial deposits in Anina (Colonia Ceha Quarry, Resita Basin), belonging to the Getic Nappe in the Southern Carpathians, Western Romania. Heteropodous pes-manus sets and one short, narrow-gauge trackway have been recognized on a large sandstone surface trampled by sauropods. Agreater load was carried by the inner digits of the pes, particularly digit I, and the heel pad is deeply imprinted, which points to a sub-plantigrade pes and gravipodal posture, typical for Eusaropoda. A pentadactyl manus imprint suggestetthat manus digits of early sauropods might have been separate and perhaps more functional when supporting walking on unstable, sticky ground. These tracks, the first find of Jurassic dinosaur footprints in Romania, add an important site to the relatively rare record of earliest Jurassic sauropod footprints. These tracks also confirm that Pangaean islands and peninsulas around the Western Tethys were inhabited by early sauropods. These peninsulas or islands, including a hypothetical "Moesian Island", must have been at least temporarily connected with the mainland. The sizes of the Romanian footprints are similar to the Hettangian Parabrontopodus isp. tracks described from Poland (mainland Pangaea — Eurasian area) and Italy (Tethyan domain) and do not indicate insular dwarfism.
    Źródło:
    Geological Quarterly; 2009, 53, 4; 461-470
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New approaches to developing the integral indicator methodology for estimating the financial efficiency of agricultural entities in Poland, The Republic of Moldova, and EU countries
    Autorzy:
    Trojak, M.
    Popa, D.
    Sargo, A.
    Kiełbasa, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/29432140.pdf
    Data publikacji:
    2019
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Źródło:
    Zeszyty Naukowe Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie. Problemy Rolnictwa Światowego; 2019, 19[34], 4; 103-112
    2081-6960
    Pojawia się w:
    Zeszyty Naukowe Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie. Problemy Rolnictwa Światowego
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation model for maritime container terminal
    Autorzy:
    Rusca, F.
    Popa, M.
    Rosca, E.
    Rusca, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/374149.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    container terminal
    simulation model
    maritime transport
    terminal kontenerowy
    model symulacyjny
    transport morski
    Opis:
    For logistic chains that have a maritime component, the ports transition involves a set of specific operations inside maritime container terminals. This can be cargo handling operations from the terrestrial vehicle in the storage area of ports, from port storage area in the maritime ships, as well as storage operations in the port area and other container terminal activities. Taking into consideration the multi-flow interactions and the non-uniform arrival of vessels and in-land vehicles, discrete event simulation stands as a feasible technique for investigating berthing capacity during the initial planning stage of the terminal or for operative planning of logistic processes at the terminal. If the storage area is analysed as a queuing system, the quality serving attributes could be evaluate. When different distributions for arrival flows of the containers in the maritime container terminal are taken into consideration, the quality serving attributes are difficult to estimate. In our paper, a discrete simulation model is developed in ARENA software for case of a maritime container terminal. The estimation of the general measures of performance for the container port terminals through simulation could provide data for the implementation in the management plans by port administrations.
    Źródło:
    Transport Problems; 2018, 13, 4; 47-54
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hettangian tetrapod burrows from the continental Steierdorf Formation at Anina, western Romania
    Autorzy:
    Csiki-Sava, Z.
    Kedzior, A.
    Pienkowski, G.
    Popa, M. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059864.pdf
    Data publikacji:
    2016
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    tetrapod burrows
    therapsids
    crocodyliforms
    dinosaurs
    Lower Hettangian
    Steierdorf Formation
    Opis:
    Very large, sparsely distributed, sinuous, gently dipping and occasionally branching tunnels with subordinate swells, as well as possible chambers and scratches, are described from the Hettangian Dealul Budinic Member of the Lower Jurassic continental Steierdorf Formation at Anina in the South Carpathians, Romania, and are interpreted as tetrapod burrows. No bone remains have been found in association with these structures. The morphology and large dimensions of the burrows suggest that the trace-makers were sauropsid amniotes, most probably either crocodyliforms or small-sized basal neornithischian dinosaurs, although their therapsid affinities, despite being less likely, cannot be discarded either. The age, large size and probable origin of these burrows add important information to a poorly documented period of the evolution of tetrapod fossoriality. It may be suggested that within a relatively short time interval following the Triassic-Jurassic extinction event, when environmental conditions were still marked by strongly seasonal climate with prolonged droughts as well as extreme moisture and temperature fluctuations, fossorial habit probably became yet again an endurance strategy for burrow makers.
    Źródło:
    Geological Quarterly; 2016, 60, 2; 395--406
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of low temperature plasma capabilities to modify the structure and function of bio-polymers
    Autorzy:
    Motrescu, I.
    Hara, T.
    Ogino, A.
    Tanaka, S.
    Fujiwara, T.
    Kawagishi, H.
    Kodani, S.
    Popa, G.
    Nagatsu, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/385288.pdf
    Data publikacji:
    2009
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    biopolymers
    biomolecules
    low temperature plasma
    modification
    plasma processing
    Opis:
    The possibility to modify biopolymers using low temperature plasma is investigated. Two types of plasma are employed in this study: an atmospheric pressure plasma and a low pressure microwave plasma. In both cases changes of the structure and function of the exposed molecules are reported, the effects being stronger for the low-pressure plasma irradiation.
    Źródło:
    Journal of Automation Mobile Robotics and Intelligent Systems; 2009, 3, 4; 150-152
    1897-8649
    2080-2145
    Pojawia się w:
    Journal of Automation Mobile Robotics and Intelligent Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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