Temat: IAT - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Geochemistry and tectonic setting of the volcanic host rocks of VMS mineralisation in the Qezil Dash area, NW Iran : implications for prospecting of Cyprus-type VMS deposits in the Khoy ophiolite
Autorzy:: Imamalipour, Ali
Barak, Samaneh
Powiązania:: https://bibliotekanauki.pl/articles/2058590.pdf
Data publikacji:: 2019
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: geochemistry
massive sulphide mineralisation
IAT
ophiolite
Khoy
Iran
Opis:: The uppermost part of the Khoy ophiolite includes submarine volcanic lavas. These rocks are found as two different types including basaltic pillow lavas and andesitic to andesitic basalt massive-sheet lavas known as the Qezil Dash unit. These last rocks host volcanogenic massive sulphide mineralisation (VMS). Concordant small lenticular massive sulphides associated with widespread stockworks, extensive wall rock alteration and simple mineralogical parageneses are characteristic of this mineralisation. The Qezil Dash lavas are characterized by HFSE depletion (such as in Nb, Zr, and Hf) and LILE enrichment, low Yb, Y and Ni contents and low Zr/Hf and Nb/Ta ratios. These rocks have low Ti contents and are of LKT type. These geochemical characteristics can be interpreted as indicating SSZ magmatism and suggesting that the Qezil Dash rocks belong to an early stage of island arc formation. Geochemically, this host rock is comparable with the Lasail unit, part of a volcanic sequence within the Oman ophiolite. In the Troodos and Oman ophiolites VMS mineralisation has occurred at the contacts of MOR-basalt and island arc tholeiite (IAT) lavas, so prospecting for VMS deposits in the Khoy area should be estabilished based on geochemical investigations of the volcanic rocks and recognition of their field boundaries.
Źródło:: Geological Quarterly; 2019, 63, 3; 435--448
1641-7291
Pojawia się w:: Geological Quarterly
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Assessment of relative-active tectonics in rhumel-smendou basin (ne Algeria) – observations from the morphometric indices and hydrographic features obtained by the digital elevation model
Autorzy:: Manchar, Nabil
Hadji, Riheb
Bougherara, Ahmed
Boufaa, Kamel
Powiązania:: https://bibliotekanauki.pl/articles/2201673.pdf
Data publikacji:: 2022
Wydawca:: Uniwersytet Rolniczy im. Hugona Kołłątaja w Krakowie
Tematy:: Bs
SL
Hi
Smf
AF
Vf
IAT
SMF
BS
Opis:: The eastern Tell Atlas of Algeria is characterized by a complex neotectonic system including lateral strike-slips, and normal and reverse faults. The landscape of the Neogene basin of MilaConstantine acquired its shape due to the perpetual action of tectonic activity, and erosion processes. Neo-tectonics in this basin have affected the geometry of the stream network and the contemporary landscape topography. Our methodology evaluates the active tectonics in this mountainous region by a combination of drainage network and geomorphic indices, namely, the basin-shape index (Bs), stream-length gradient (SL), hypsometric integral (HI), mountain front sinuosity (Smf), basin asymmetry factor (AF), and valley-floor ratio (Vf). The calculated values of the six measured geomorphic indices were used to differentiate the distribution of faults function as well as the relative tectonic activity in the study area. The obtained results from the GIS-based multi-criteria analysis of these indices consist of the index of active tectonics (IAT). Hence, we defined four hierarchic degrees of IAT, namely, very high (VH), high (H), moderate (M), and low (L). The relative active tectonics represents an obvious correlation between morpho-structural features, tectonic activities, and uplift rates. It selects the morphotectonic features and landforms that interpret the tectonic events in the study area. Our results prove that this approach discerns the most active regions related to the neo-tectonic action in the RhumelSmendou drainage basin. The combination of geomatics and field surveys highlights the cliffs which are still rising by using the drainage patterns, the landform model, and the mountain range shape.
Źródło:: Geomatics, Landmanagement and Landscape; 2022, 4; 47--65
2300-1496
Pojawia się w:: Geomatics, Landmanagement and Landscape
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Determination of bubble size distribution in a laboratory mechanical flotation cell by a laser diffraction technique
Autorzy:: Mazahernasab, R.
Ahmadi, R.
Powiązania:: https://bibliotekanauki.pl/articles/110401.pdf
Data publikacji:: 2016
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: bubble size distribution
mechanical flotation cell
laser diffraction technique (LDT)
Image Analysis Technique (IAT)
effective parameters
Opis:: In this study, a laser diffraction technique (LDT) was used to measure size distribution of bubbles generated in a two-phase system in a laboratory mechanical flotation cell. In LDT, a laser light beam passed through the bubbles inside the measurement cell and the scattered light was recorded by detectors. In order to show the effectiveness of LDT, an image analysis technique (IAT) was applied in parallel to measure the size of bubbles. To determine the bubble size by IAT, around 200 images were taken in each test. In addition, the important operating parameters of the mechanical flotation cell affecting the bubble size distribution, including the impeller speed, aeration rate and frother concentration, were investigated. The response parameter in this study was Db(50) which represent the size of bubble at which there is 50% of the distribution. The results of this study showed that the LDT and IAT techniques were in a good agreement when Db(50) was in the range of -800+400 μm and there was a discrepancy for Db(50) in the range of -400+100 μm. Furthermore, Db(50) decreased from 727 to 284 μm when impeller speed increased from 700 to 1200 rpm. Additionally, an increase in the aeration rate from 1 dm3/min to 2.5 dm3/min led to a rise in Db(50) from 418 to 456 μm. Finally, increasing the frother concentration from 10 to 60 ppm reduced the Db(50) from 704 to 387 μm.
Źródło:: Physicochemical Problems of Mineral Processing; 2016, 52, 2; 690-702
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Aktywność wykazywana w sieci przez śląskich studentów niezagrożonych i zagrożonych uzależnieniem od internetu – analiza statystyczna
Activity exhibited on the internet by the Silesian students unthreatened internet addiction and threatened internet addiction – statistical analysis
Autorzy:: Warzecha, Katarzyna
Powiązania:: https://bibliotekanauki.pl/articles/591074.pdf
Data publikacji:: 2015
Wydawca:: Uniwersytet Ekonomiczny w Katowicach
Tematy:: Cele korzystania z Internetu
Internet
Śląscy studenci
Zagrożenie uzależnieniem od Internetu
Internet Addiction Test (IAT)
Risk of Internet addiction
objectives using the Internet
Silesian students
Opis:: Coraz powszechniejszy dostęp do Internetu ma wiele pozytywnych aspektów (szybki dostęp do informacji i wiedzy oraz błyskawiczne przetwarzanie i przekazywanie danych, a także nieograniczona i ekspresowa komunikacja pomagająca podtrzymywać relacje z ludźmi i pozyskiwać nowe kontakty), ale nie należy lekceważyć istnienia zagrożenia uzależnieniem od tego medium, coraz częściej występującego szczególnie wśród osób młodych, które potrafią godzinami przebywać w sieci. Głównym celem prowadzonych badań było poznanie aktywności wykazywanej w sieci przez śląskich studentów (celów i intensywności korzystania z Internetu, stopnia wyposażenia studentów w nowoczesne środki komunikacji z dostępem do Internetu), a także zbadanie, czy częstotliwość i rodzaj przejawianej w sieci aktywności śląskich studentów uzależnionych i zagrożonych uzależnieniem od sieci jest istotnie różna od aktywności śląskich studentów niezagrożonych uzależnieniem od Internetu.
Universal access to the Internet has many positive aspects but do not under-estimate a possible risk to of this medium addiction to among young people. The main objective of the study was to investigate the activity exhibited by the Silesian students on the Net (goals and intensity of Internet use, the degree of equipment students with modern means of communication with Internet access) and to investigate whether the frequency and type of activity the Silesian students addicts and threatened Internet addiction is significantly different since the Silesian students unthreatened Internet addiction. The study was conducted using Young’s Internet Addiction Test.
Źródło:: Studia Ekonomiczne; 2015, 220; 99-116
2083-8611
Pojawia się w:: Studia Ekonomiczne
Dostawca treści:: Biblioteka Nauki

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