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    Wyświetlanie 1-5 z 5
    Tytuł:
    Możliwości zastosowania echosondy „CHEMKOP” i kawernomierza wielkośrednicowego do badania kawern podziemnych
    Application possibilities of the CHEMKOP ultrasonic probe and large-scale borehole cavernometer in investigation of underground caverns
    Autorzy:
    Nguyen, Dinh Chau
    Kubacka, Tomasz
    Figarski, Mateusz
    Powiązania:
    https://bibliotekanauki.pl/articles/164396.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Górnictwa
    Tematy:
    kawernomierz wielkośrednicowy
    echosonda
    kawerny
    węglowodory
    solanka
    large-scale cavernometer
    ultrasonic probe
    caverns
    hydrocarbon liquid
    gas
    brine
    Opis:
    W tej pracy przedstawiono możliwości zastosowania geofizycznych sond otworowych, tj. kawernomierza wielkośrednicowego i echosondy ultradźwiękowej, które zostały skonstruowane przez Ośrodek Badawczo-Rozwojowy Górnictwa Surowców Chemicznych „CHEMKOP” Sp. z o.o. do badania kształtu i rozmiarów kawern powstałych w wysadach oraz pokładach solnych. Zbadano zarówno w warunkach laboratoryjnych, jak i rzeczywistych wpływ temperatury, ciśnienia i zasolenia cieczy na prędkość rozchodzenia fali ultradźwiękowej. Podano również sposoby określenia granicy między szyją a stropem kawern, granicy rozdziału faz między gazem a solanką zawartych w kawernach. Badania te realizowane są na etapie eksploatacji pokładu soli złożowej oraz podczas magazynowania w kawernach węglowodorów ciekłych lub gazowych.
    This paper presents the application possibilities of the large-scale cavernometer and echo probe produced by CHEMKOP Company in the study of the shape and geometrical parameters of the underground caverns formed in consequence of salt deposits exploitation. The influence of temperature, pressure and mineralization of the brine on the propagation velocity of the acoustic wave was tested in both laboratory and real conditions. The methods for localization of the boundary between borehole and cavern body as well as the boundary between gas and brine were proposed. The measurements of the geometrical parameter using the mentioned probes could be made during salt exploitation as well as during accumulation of the hydrocarbon liquid fuel in the studied caverns.
    Źródło:
    Przegląd Górniczy; 2019, 75, 4; 1-7
    0033-216X
    Pojawia się w:
    Przegląd Górniczy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    3D block modelling of the Sin Quyen IOCG deposit, North Vietnam
    Autorzy:
    Hao, Duong Van
    Nguyen, Dinh Chau
    Klityński, Wojciech
    Zygo, Władysław
    Nowak, Jakub
    Powiązania:
    https://bibliotekanauki.pl/articles/27310153.pdf
    Data publikacji:
    2023
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    North Vietnam
    iron oxide copper deposits
    3D model
    resources
    deposit development
    Opis:
    The IOCG Sin Quyen deposit is located in the Red River shear zone of North Vietnam. The ore bodies are known as hydrothermal veins and are hosted in Proterozoic metapelite. A block modelling approach was used to build a 3D model of the ore bodies. An analysis was carried out on Surfer 11 computer software using the archival data recorded from several dozen boreholes distributed within the study area, as well as data obtained from the mineral and chemical analysis of 50 samples collected recently in the deposit. The ore bodies generally trend in a NW-SE direction with an average azimuth of 107° and dip of around 70°.The Cu content in the ore bodies is inhomogeneous. In the bed extension direction, the exponential correlation of Cu concentration in ore bodies is recognized within 2,500 m, while in the direction perpendicular to the bed strike, the exponential dependence is observed on 500 m of distance. The high-grade mineralisation of copper within the ore bodies is often at the altitude interval from ∼100 m to ∼150 m above sea level (asl). These bodies are also rich in uranium and gold bearing minerals. The total resources of Cu, U and Ag were estimated and amount to 361,000; 12.7 and 11.87 tonnes respectively. The model indicates the downward extension of some ore bodies to below 300 m beneath the ground surface.
    Źródło:
    Geology, Geophysics and Environment; 2023, 49, 2; 175--195
    2299-8004
    2353-0790
    Pojawia się w:
    Geology, Geophysics and Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The contribution of geophysics to archaeology: a case study of an ancient canal of the Oc Eo culture in the Mekong Delta, Vietnam
    Autorzy:
    Le, Ngoc Thanh
    Nguyen, Quang Dung
    Nguyen, Quang Bac
    Nguyen, Quang Mien
    Nguyen, Dan Vu
    Duong, Ba Man
    Nguyen, Dinh Chau
    Powiązania:
    https://bibliotekanauki.pl/articles/184367.pdf
    Data publikacji:
    2019
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    electromagnetic profiling
    electrical resistivity tomography
    hand-auger
    radiocarbon dating
    ancient canal
    alluvial deposits
    Oc Eo culture
    Ba The mountain
    Opis:
    Generally, underground ancient canals are infilled with alluvial materials, with the canal bed and substrate often having different resistivity values. This study aimed to determine the location and morphology of Malleret’s ancient canal 16 located to the southeast of the Ba The mountain, Mekong Delta, Vietnam by means of geophysical techniques. Two geophysical methods were used: electromagnetic profile and electric resisitivity tomography. A geoelectric structure 70 m long with 70–95 mS/m of apparent conductivity was found. On the electrical resistivity tomography section, a resistivity zone of 10–20 Ω∙m, 1–4 m deep, 70 m wide corresponds to the mentioned above geoelectric structure, which is in an asymmetric U-shape extending toward the southeastern bank of canal 16. Hand-augering confirmed that the canal bed is fully incised into Holocene sediments as a substrate which stretches down to the Pleistocene. The sediments are composed of loams mixed with plant remains with a resistivity ρ ~ 10–15 Ω∙m. Both of the canal banks at a depth of 5 m are made up of Holocene sedi-ments (ρ ~ 4–10 Ω∙m). The 14C measurements determined the age of the organic matter in the canal as being equal to 1210 ±85 BP, suggesting canal 16 ceased being operational at that time. The precise positioning of canal 16 on the ground surface, as well as identifying the morphology of the canal bed, were corroborated by geophysical techniques. The obtained results are of considerable value to archaeologists.
    Źródło:
    Geology, Geophysics and Environment; 2019, 45, 1; 45-56
    2299-8004
    2353-0790
    Pojawia się w:
    Geology, Geophysics and Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Timing of ore mineralization using ore mineralogy and U-Pb dating, Iron Oxide Copper Gold Sin Quyen deposit, North Vietnam
    Autorzy:
    Pieczonka, Jadwiga
    Nguyen, Chau Dinh
    Piestrzyński, Adam
    Le, Phon Khanh
    Powiązania:
    https://bibliotekanauki.pl/articles/2058646.pdf
    Data publikacji:
    2019
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    IOCG deposit
    uraninite dating
    mineral stages
    geochemistry
    Opis:
    Magnetite, pyrite, pyrrhotite, chalcopyrite and sphalerite are the major minerals identified in the deposit, while ilmenite, marcasite, tennantite, cubanite, arsenopyrite, galena, allanite, chevkinite, apatite, Bi-native, bismuthinite, electrum, native gold, and tellurides are the minor ones in the Iron Oxide Copper Gold (IOCG) Sin Quyen deposit. The REEs are hosted mostly by allanite, and the minor minerals by chevkinite, monazite, apatite and uraninite. Based on chemical analyses and Raman spectroscopy, two varieties of allanite have been documented: (1) with lower total REE contents of 13-19 wt.%, and (2) with higher contents of 20-23 wt.%. Uraninite from copper-iron massive ores is inhomogeneous in both optical properties and chemical composition. The concentrations of uranium and total rare earth element oxides (REOs) in the paragenetically earlier uraninite are 84.55-85.96% and 1.9-8.0% on average, respectively, whereas in paragenetically later uraninite, the U and ΣREE2O3 concentrations are 96.2-96.7% and 1.3-2.7% on average respectively. The thorium concentration in both the early and late uraninites is very low (0.21-0.22% and 0.2 % on average). These are the highest REE concentrations as compared with the known concentrations of these elements in uraninite. Electron microprobe “chemical” dating of the uraninite yielded an age of 500 ±33 Ma (n = 35) for the paragenetically early uraninite, and an age of 73 ±15 Ma (n = 6) for the paragenetically later ones. The minerals of the older age, which is interpreted as the primary ore mineralization stage, correspond in age with a range of deposits along the East Gondwana margin. The measured δ34S of sulphide minerals from -2.78 to +8.65‰ suggests hydrothermal origin of fluid that was responsible for transportation and crystallization.
    Źródło:
    Geological Quarterly; 2019, 63, 4; 861--874
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    National comparison of methods for determination of radon in water
    Autorzy:
    Mazur, Jadwiga
    Kozak, Krzysztof
    Grządziel, Dominik
    Guguła, Szymon
    Mroczek, Mariusz
    Kozłowska, Beata
    Walencik-Łata, Agata
    Podgórska, Zuzanna
    Wołoszczuk, Katarzyna
    Przylibski, Tadeusz A.
    Kowalska, Agata
    Domin, Elżbieta
    Wysocka, Małgorzata
    Chałupnik, Stanisław
    Chmielewska, Izabela
    Długosz-Lisiecka, Magdalena
    Szajerski, Piotr
    Chau, Nguyen Dinh
    Krakowska, Paulina
    Pliszczyński, Tomasz
    Ośko, Jakub
    Dymecka, Małgorzata
    Mazurek, Daria
    Powiązania:
    https://bibliotekanauki.pl/articles/148272.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    AlphaGUARD monitor
    interlaboratory comparison
    LSC method
    radon in water
    Z-score value
    Opis:
    The article describes three interlaboratory experiments concerning 222Rn determination in water samples. The first two experiments were carried out with the use of artificial radon waters prepared by the Laboratory of Radiometric Expertise (LER), Institute of Nuclear Physics, Polish Academy of Sciences in Kraków in 2014 and 2018. The third experiment was performed using natural environment waters collected in the vicinity of the former uranium mine in Kowary in 2016. Most of the institutions performing radon in water measurements in Poland were gathered in the Polish Radon Centre Network, and they participated in the experiments. The goal of these exercises was to evaluate different measurement techniques used routinely in Polish laboratories and the laboratories’ proficiency of radon in water measurements. In the experiment performed in 2018, the reference values of 222Rn concentration in water were calculated based on the method developed at LER. The participants’ results appeared to be worse for low radon concentration than for high radon concentrations. The conclusions drawn on that base indicated the weaknesses of the used methods and probably the sampling. The interlaboratory experiments, in term, can help to improve the participants’ skills and reliability of their results.
    Źródło:
    Nukleonika; 2020, 65, 2; 77-81
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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