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    Wyświetlanie 1-6 z 6
    Tytuł:
    Corrosion of carbonate speleothems by an allogenic river inferred from petrography and a weight loss experiment : a case study from the Demänová Cave System, Slovakia
    Autorzy:
    Sala, Przemysław
    Bella, Paweł
    Powiązania:
    https://bibliotekanauki.pl/articles/27311293.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    Karst
    carbonates
    hiatus
    dissolution
    palaeoenvironment
    Opis:
    The crystallization of speleothems can be interrupted by the invasion of allogenic water into cave passages. These interruptions were studied, both in speleothems currently submerged in an underground river and in speleothem sections, which were found at the lowermost fluvially active passage level of the Demänová Cave System. The interaction between speleothems and allogenic water, undersaturated with respect to calcite, is manifested in the presence of siliciclastic material and the corrosion of calcite crystals. The progressive development of corrosion features depends on the duration of the interaction of calcite crystals with allogenic water. Moreover, the movement of the water and siliciclastic deposition over the speleothems can influence the corrosion process. The estimated rate of corrosion, caused by the underground Demänovka River and measured by the weight loss of experimental tablets, is up to 0.029 mm/y. U-series dating indicated that the interaction of speleothems with allogenic water occurred during the Vistulian (Weichselian). The identification of corrosion episodes, caused by allogenic water, is a step towards understanding the origin of hiatuses and establishing criteria for recognition of them.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2023, 93, 4; 467--481
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hiatus hernia – Late complication after gastrectomy followed by double tract reconstruction (DTR): a case report
    Autorzy:
    Bandurski, R.
    Gryko, M.
    Dawidziuk, T.
    Zaręba, K.
    Cepowicz, D.
    Kędra, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1916509.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Medyczny w Białymstoku
    Tematy:
    gastric cancer
    hiatus hernia
    late complication
    surgery
    Opis:
    In patients with dyspeptic symptoms who have been treated for gastric cancer, other medical conditions apart from cancer recurrence should be considered. A long small-bowel loop left after esophagogastric anastomosis, flaccid diaphragmatic crura, and several external factors such as hard physical exertion can promote the development of postoperative hiatus hernia. The authors of this paper present a rare case of hiatus hernia considered a late complication of primary surgery performed due to gastric cancer. The 63-year-old patient had undergone total gastrectomy with double tract reconstruction (DTR) six years earlier. Gastrectomy was performed with extended lymphadenectomy (>D2). Histopathologic examination of tumor specimens showed mucinous adenocarcinoma with no lymph node metastasis and no distant metastases (pathologic staging: pT2, pN0, pM0). After six years, the patient was admitted to the 2nd Department of General and Gastroenterologic Surgery with abdominal pains, malaise, weight loss and feeling of fullness after small meals. Diagnostic procedures performed showed the presence of hiatus hernia, a very rare complication after this particular surgery, with no features of cancer recurrence. The patient was underwent surgery and the hernia was successfully repaired.
    Źródło:
    Progress in Health Sciences; 2014, 4, 1; 265-268
    2083-1617
    Pojawia się w:
    Progress in Health Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimality Theoretic Analysis of Non-Rhoticity in English
    Autorzy:
    Ostalski, Przemysław
    Powiązania:
    https://bibliotekanauki.pl/articles/620685.pdf
    Data publikacji:
    2007-01-01
    Wydawca:
    Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
    Tematy:
    Phonology
    Optimality Theory
    Rhoticity
    Accents of English
    Hiatus
    Opis:
    The paper intends to describe various rhotic phenomena within a unified phonological framework of Optimality Theory. This description encompasses "standard" rhotic phenomena, such as linking and intrusive r. Additionally both hyper- and hypo-rhoticity are discussed. The paper serves primarily two points. First, it proves practical workability of constraint mechanism, as proposed by Optimality Theory. Second, it presents an integrated account of seemingly unrelated phonological facts observed in various accents of English.The paper discusses also previous accounts of rhoticity in English in connection with an attempt of presenting solid evidence for the choice of underlying forms. Furthermore two competing theoretical descriptions of rhotic insertions (epenthesis vs. gliding/spreading) are compared and evaluated. Finally, the spreading account is shown to be formally superior to the anti-hiatus approach.Moreover, the paper demonstrates a way in which r-liaison might be incorporated in the synchronic grammar of non-rhotic accents. Simply put, r-liaison could be perceived as another instantiation of VSpread conspiracy, where vowels tend to spread their melodic content onto the following segments. The OT machinery was also employed to account for the differences between various subtypes of non-rhotic accents, in terms of re-ranking of several constraints. The peculiar phenomena of hyper-rhoticity have, too, been demonstrated to fit the proposal.
    Źródło:
    Research in Language; 2007, 5; 109-133
    1731-7533
    Pojawia się w:
    Research in Language
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A discussion on the optimality of bulk entry queue with differentiated hiatuses
    Autorzy:
    Vadivukarasi, Manickam
    Kalidass, Kaliappan
    Powiązania:
    https://bibliotekanauki.pl/articles/2175843.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    differentiated hiatus time
    steady state probability
    waiting-time distribution
    optimization of expenses
    Opis:
    We consider Markovian differentiated hiatuses queues with bulk entries. With the help of the matrix geometric method, we discuss the stability condition for the existence of the steady-state solution of our model and we obtain the stationary system size by using a probability generating function. The stochastic decomposition form of stationary system size and the waiting time distribution of an arbitrary beneficiary are also analysed. Furthermore, we perform the expense analysis using the particle swarm optimization technique and we obtain the optimality of service rate and hiatus rate. Finally, we study the effects of changes in the parameters on some important performance measures of the system through numerical observations.
    Źródło:
    Operations Research and Decisions; 2022, 32, 2; 137--150
    2081-8858
    2391-6060
    Pojawia się w:
    Operations Research and Decisions
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Lower Kimmeridgian layer with bored and encrusted hiatus concretions (Upper Jurassic, Central Poland) : implications for stratigraphy and basin evolution
    Autorzy:
    Krajewski, M.
    Olchowy, P.
    Felisiak, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/191944.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    calciturbidites
    hardground
    synsedimentary tectonism
    hiatus concretions
    borings
    encrustations
    marker horizon
    Upper Jurassic
    Central Poland
    Opis:
    The paper presents a comparative analysis of a Lower Kimmeridgian layer with bored and encrusted hiatus concretions collected in three study areas, located in Central Poland. These studies demonstrate distinct similarities between the hiatus concretions in terms of their origin, development and stratigraphic position. The layer with its characteristic concretions seems to represent an important marker horizon for the Lower Kimmeridgian successions in Central Poland. The identification of this marker horizon in drill cores and exposures could be important for definition of the stratigraphic position of the sediments, which otherwise lack appropriate biostratigraphic information. The matrix of the concretions is composed of pelagic calciturbidites, which reflect flooding of the early Kimmeridgian platform. These sediments were lithified early and formed a hardground. The origin of the hiatus concretions probably is related to erosion of the hardground, followed by redeposition and several phases of exhumation and erosion, preceding final burial. The characteristic ecological successions, observed in the concretions, document an evolution from soft to firm and hard marine substrates, typical of hardgrounds and evidenced by various burrows, borings (Gastrochaenolites, Trypanites), and epizoans. Calciturbidite sedimentation, hardground erosion and redeposition of the hiatus concretions, known from deposits of the Platynota Zone in Central Poland, were associated with synsedimentary activity of the Holy Cross Fault, on the NE margin of the extensive, tectonic Małopolska Block.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2014, 84, 2; 113-129
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Konkrecje hiatusowe z iłów rudonśnych Wyżyny Krakowsko-Częstochowskiej
    Hiatus concretions fromthe ore-bearing clays of the Cracow-Czestochowa Upland (Polish Jura)
    Autorzy:
    Zatoń, M.
    Marynowski, L.
    Bzowska, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/2074474.pdf
    Data publikacji:
    2006
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    konkrecje hiatusowe
    Wyżyna Krakowsko-Częstochowska
    hiatus concretions
    Middle Jurassic
    Cracow-Częstochowa Upland
    borers
    encrusters
    Opis:
    Hiatus concretions are arly-diagenetic sedimentary bodies, which in their history of formation, underwent exhumation during sedimentation break and/or erosion of sea-floor. Then they were colonized by various encrusters and borers, before they were buried again. Within Middle Jurassic (Bajocian through Bathonian) clays, hiatus concretions occur in four localities in the Cracow-Częstochowa Upland (south and central Poland): Ogrodzieniec, Bugaj, Mokrsko and Krzyworzeka. Preliminary data about their mineralogy, organic geochemistry and palaeoecology is given. Mineralogical analyses showed, that except dominant high Mg-calcite (up to 87.10% of total carbonates), concretions possess minor amounts of such compounds as quartz, clay minerals (kaolinite and illite), pyrite, siderite or Mg-kutnahorite. However, high differences are observed between total organic carbon contents of concretions (TOC=0.46%) and surrounded clays (TOC = 2.16%), but their molecular composition is similar. Most of identified biomarkers are of terrestrial origin. In clay lithology, the hiatus concretions are the only sedimentary bodies that clearly mark the sedimentation pauses (hiatuses). In the investigated area, they form more or less continuous horizons. The concretions are calcitic, possessing various encrusting fauna such as bryozoans, oysters and oyster-like bivalves, serpulids, solitary corals and foraminifers. They often post-date the borings, belonging to such ichnogenera as Gastrochaenolites, Trypanites and Entobia. Some of the nodules show distinct transition from firmground (characterized by the presence of Glossifungites ichnocoenosis) to hardground (presence of Trypanites ichnocoenosis), pointing to the fact, that they formed at, or very close to, the sediment-water interface. Some concretions, like those from Bugaj and Mokrsko, are characterized by their high diversity of hard bottom communities. Those concretions are also irregular in shape; others, like those from Ogrodzieniec and Krzyworzeka, possess lower diversity. The concretions from Krzyworzeka are especially dominated by the borers, while the encrusters are sparse and not diverse. Those nodules that are wide and flat tend to be more bored on one surface only, while those that are more roundish, are bored on both sides more evenly. The degree of diversity is probably correlated with physical disturbance, causing the rolling and overturning of the exhumed concretions in the littoral zone. On the other hand, the overall diversity could be lowered due to destructive abrasion either of the shallowest borings, echinoid/gastropod scratch marks and shells of nestling bivalves, as well as more delicate epilithozoans.
    Źródło:
    Przegląd Geologiczny; 2006, 54, 2; 131-138
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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