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    Wyświetlanie 1-3 z 3
    Tytuł:
    An innovative time-saving method of turning for vessels conducting seismic surveys
    Autorzy:
    Walus, A.
    Gucma, L.
    Putynkowski, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/135513.pdf
    Data publikacji:
    2016
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    efficiency
    geophysics
    navigation
    seismic
    vessels
    surveys
    Opis:
    The paper presents a turning method saving time and energy while conducting seismic surveys and an example of its application. The introduced turning method is based on use of the ocean currents / tidal streams as a supporting factor. The turning technique is applicable for vessels towing streamers and conducting line-change or other maneuvers similar to 180° turn. Chosen forces affecting seismic in-water equipment as well as behavior of the spread are briefly shown and explained. Some advantages over traditional turning techniques are here described. The method was applied onboard the seismic vessel Geo Pacific reducing significantly time required for line-change.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2016, 45 (117); 207-211
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The concept of marine seismic research quality coefficient of improve its accuracy and efficiency
    Autorzy:
    Waluś, A.
    Gucma, L.
    Putynkowski, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/320938.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Forum Nawigacyjne
    Tematy:
    geophysical maritime seismic research
    quality of marine geophysical works
    seismic vessel navigation
    Opis:
    The paper presents the stages of quantitative coefficient of marine seismic researches creation for the geophysical vessels towing the geophysical seismic equipment understood as system of seismic streamers where set of geophones are installed. The quality coefficient of geophysical research works is based on the mathematical model of the deviation of the position of the arrangement of streamers geophone points with relation to their idealized position. The proposed coefficient can be used during realization of seismic researches and for short-term prediction of their quality.
    W artykule przedstawiono budowę ilościowego wskaźnika jakości morskich prac sejsmicznych dla jednostki holującej osprzęt geofizyczny w postaci układu kabli sejsmicznych z zainstalowanym zespołem geofonów. Wskaźnik jakości prac geofizycznych opiera się na matematycznym modelu odchylenia położenia układu punktów kabli geofonowych w stosunku do położenia wzorcowego. Wskaźnik ten może być wykorzystany przy realizacji prac sejsmicznych oraz krótkoterminowego prognozowania ich przebiegu w aspekcie jakości.
    Źródło:
    Annual of Navigation; 2014, 21; 163-176
    1640-8632
    Pojawia się w:
    Annual of Navigation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characteristics of soil of “Józefka” deposit overlay, Kielce District
    Autorzy:
    Pawlikowski, M.
    Manecki, M.
    Kozień, D.
    Waluś, E.
    Borecka, A.
    Stanisz, J.
    Pękala, M.
    Kiecana, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/184183.pdf
    Data publikacji:
    2016
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    mine
    mineral composition
    geotechnics
    Opis:
    The aim of this article is to describe and characterize the properties of the overburden overlying rocks of “Józefka” mine, with an attempt to demonstrate a dependence of diversified mineral composition on geotechnical characteristics of the tested material. The article presents previously obtained unpublished data necessary for the evaluation of the physical characteristics of the overlying rocks. The research was conducted in the mining area of the “Józefka” mine, located in Górno – ca. 10 km eastwards from Kielce. Dolomite and calcareous rocks, estimated to be Givetian in age (Czarnocki 1938), are exploited in the mine. The obtained material is used as road aggregate. The deposit is located in the southern part of the Świętokrzyskie Mountains, in the so-called Kielce zone being a part of Małopolska Province Massif (Stupnicka 1997). Silty soils occur there as pockets and interbeds. An attempt to describe them precisely has not been undertaken as yet. Three samples with intact structure and natural moisture were collected during field work. The deposit investigations were carried out at two stages: 1) mineralogical and petrographic, and 2) geotechnical. At the first stage, the analysis included optical microscopy of thin sections, X-ray diffractometry and thermal differential analysis DTA. Clay fraction (below 2 μm) was separated by settling in water. Oriented specimens, glikoled and heated to 550°C were analyzed. The rock contains up to 70 wt% of detrital quartz. The second stage of the research programme was conducted in accordance with the engineering practice and standards (PKN-CEN ISO/TS 17892-2:20 09). Basic physical parameters were established: - natural moisture – w n [%], - bulk density – ρ [g/cm 3 ], - density – ρ s [g /cm 3 ], - granulometric composition, - plasticity – w P [%] and liquidity limits – w L [%], - swelling index – p [%]. The results of the mineralogical and petrographical tests revealed that kaolinite is the main fraction of clay minerals in all three samples. The content of clay fraction was determined with the use of two methods: - water separation – 50 g of material was prepared; the clay material in sample 1 constitutes 55% of the whole material, in sample 2–40%, and in sample 3–39%; - areometric – 35g of material was prepared; the results show that the proportions of the clay material amount to: sample 1–48%, sample 2–33%, sample 3–29%. The concurrence of results of both methods is evident. The maximum difference of clay fraction content was 10%. It indicates the difference in selecting equally representative samples. During the geotechnical determination the tested soil was classified as: sample 1 – clay (Cl), sample 2 – sandy clay (saCl), sample 3 – silty sandy clay (sasiCl) (PN-EN ISO 14688-2:2006). Moreover the following physical properties of the samples were determined: - sample 1: w n = 22.34%, w P = 22.16%, w L = 40.5%, p = 15.42%, ρ = 2.01g/cm 3, ρ s = 2.68 g/cm 3 ; - sample 2: w n = 22.97%, w P = 23.47%, w L = 52%, p = 11.97%, ρ = 2.04g/cm 3, ρ s = 2.66 g/cm 3 ; - sample 3: w n = 20.21%, w P = 21.3%, w L = 43%, p = 21.5%, ρ = 2.05 g/cm 3, ρ s = 2.68 g/cm 3. Sample 3 was classified as highly swelling, which confirms a significant content of smectite in the mineral composition. Other samples were classified as medium swelling, correspondingly sample 1: 15.42%, and sample 2: 11.97% (Niedzielski 1993). The lowest value of bulk density of sample 1 indicates increased content of clay fraction. This is confirmed by the mineralogical and petrographical tests. Soils present in “Józefka” deposit overburden may be used as an addition to vegetable fertilizers. Their use will increase sorption of cations and water in soil. This material should be mined in a selective way due to its variability.
    Źródło:
    Geology, Geophysics and Environment; 2016, 42, 1; 116-117
    2299-8004
    2353-0790
    Pojawia się w:
    Geology, Geophysics and Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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