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    Wyświetlanie 1-7 z 7
    Tytuł:
    Monitoring Vegetation Cover Changes by Sentinel-1 Radar Images Using Random Forest Classification Method
    Autorzy:
    Tran, Van Anh
    Le, Thi Le
    Nguyen, Nhu Hung
    Le, Thanh Nghi
    Tran, Hong Hanh
    Powiązania:
    https://bibliotekanauki.pl/articles/2020227.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    vegetation cover change,
    Sentinel-1
    Random Forest
    Binh Duong
    Vietnam
    Wietnam
    wegetacja
    Opis:
    Vietnam is an Asian country with hot and humid tropical climate throughout the year. Forests account for more than 40% of the total land area and have a very rich and diverse vegetation. Monitoring the changes in the vegetation cover is obviously important yet challenging, considering such large varying areas and climatic conditions. A traditional remote sensing technique to monitor the vegetation cover involves the use of optical satellite images. However, in presence of the cloud cover, the analyses done using optical satellite image are not reliable. In such a scenario, radar images are a useful alternative due to the ability of radar pulses in penetrating through the clouds, regardless of day or night. In this study, we have used multi temporal C band satellite images to monitor vegetation cover changes for an area in Dau Tieng and Ben Cat districts of Binh Duong province, Mekong Delta, Vietnam. With a collection of 46 images between March 2015 and February 2017, the changes of five land cover types including vegetation loss and replanting in 2017 were analyzed by selecting two cases, using 9 images in the dry season of 3 years 2015, 2016 and 2017 and using all of 46 images to conduct Random Forest classifier with 100, 200, 300 and 500 trees respectively. The result in which the model with nine images and 300 trees gave the best accuracy with an overall accuracy of 98.4% and a Kappa of 0.97. The results demonstrated that using VH polarization, Sentinel-1 gives quite a good accuracy for vegetation cover change. Therefore, Sentinel-1 can also be used to generate reliable land cover maps suitable for different applications.
    Źródło:
    Inżynieria Mineralna; 2021, 2; 441--451
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Developing a Set of Criteria for Prioritising GHG Emission Reduction Measures in Metallurgical Sector
    Opracowanie zestawu kryteriów ustalania priorytetów środków redukcji emisji gazów cieplarnianych w sektorze metalurgicznym
    Autorzy:
    Tran, Xuan Truong
    Tran, Thanh Ha
    Le, Thanh Nghi
    Nguyen, Nhu Hung
    Do, Thi Thanh Nga
    Vuong, Xuan Hoa
    Powiązania:
    https://bibliotekanauki.pl/articles/318093.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    prioritising mitigation measures
    Delphi method
    metallurgical sector
    priorytetyzacja działań łagodzących
    metoda Delphi
    sektor metalurgiczny
    Opis:
    Prioritizing climate change mitigation measures could help to identify most feasible or most nationally appropriated mitigation actions. This process can also provide important inputs for the development of national climate change strategies or policies. The paper applies Delphi method to prioritize criteria for potential climate change mitigation technology in the metallurgical sector in Vietnam. The consultation process has been done with ten experts in only two cycle to reach Kendall (W) value over 0.5. Then, 11 out of 21 criteria have been selected for Multi-Criteria Decision Analysis (MCDA) in prioritizing mitigation options in iron and steel, lead, zinc, tin and aluminium productions. Mitigation options with highest scores will be proposed for mitigation target of the metallurgical sector which could be inputs for NDC of industrial sector. The selected criteria include 01 indicator in emission reduction (GPT1), 01 indicator in environmental impacts (MT1), 01 indicators in social impacts (XH3), 02 indicators in economic impacts (KT1, KT2), 02 indicators in sustainable development impacts (PTBV1, PTBV2) and 04 indicators in MRV (MRV1, MRV2, MRV3, MRV4).
    Nadanie priorytetu środkom łagodzenia zmiany klimatu może pomóc w zidentyfikowaniu najbardziej wykonalnych lub najbardziej odpowiednich na szczeblu krajowym działań łagodzących. Proces ten może również stanowić ważny wkład w rozwój krajowych strategii lub polityk w zakresie zmian klimatu. W artykule, zastosowano metodę Delphi do priorytetyzacji kryteriów dotyczących potencjalnej technologii łagodzenia zmian klimatycznych w sektorze metalurgicznym w Wietnamie. Proces konsultacji został przeprowadzony z 10 ekspertami w zaledwie dwóch cyklach, aby osiągnąć wartość Kendalla (W) powyżej 0,5. Następnie 11 z 21 kryteriów zostało wybranych do analizy decyzji wielokryterialnej (MCDA) w ustalaniu priorytetów opcji łagodzenia w produkcji żelaza i stali, ołowiu, cynku, cyny i aluminium. Opcje łagodzenia z najwyższymi wynikami zostaną zaproponowane jako cel łagodzenia dla sektora metalurgicznego, który mógłby stanowić wkład dla NDC sektora przemysłowego. Wybrane kryteria obejmują 01 wskaźnik redukcji emisji (GPT1), 01 wskaźnik wpływu na środowisko (MT1), 01 wskaźniki wpływu społecznego (XH3), 02 wskaźniki skutków gospodarczych (KT1, KT2), 02 wskaźniki wpływu na zrównoważony rozwój (PTBV1 , PTBV2) i 04 wskaźników w MRV (MRV1, MRV2, MRV3, MRV4).
    Źródło:
    Inżynieria Mineralna; 2020, 1, 2; 247-254
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Geological and Geochemical Characteristics of the Pac Lang Gold Deposits, Northeastern Vietnam and Their Potential Prospects
    Autorzy:
    Khuong, The Hung
    Nguyen, Van Dat
    Nguyen, Thi Cuc
    Pham, Nhu Sang
    Powiązania:
    https://bibliotekanauki.pl/articles/27323249.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    geology
    geochemistry
    Pac Lang gold deposit
    Vietnam
    geologia
    geofizyka
    Wietnam
    Opis:
    The Song Hien Rift basin, located in northeast Vietnam, has been identified as an important region for gold deposits, including the Pac Lang deposit. Several methods like petrographic observations, elemental analyses, and geochemical elements and vertical zoning models of primary halo have been used to describe geological characteristic of this deposit. The investigation focused on examining the geological events that occurred both before and after the formation of the ore. The use of ICP-MS analysis and element concentration contrast enabled an effective assessment of the relative degrees of denudation that occurred at the Pac Lang deposit. The findings of this study were consistent with prior research on ore deposit geology, geochemical primary-halo, and examination of geochemical indicator zoning patterns for gold ore bodies. The study's application of singularity analysis for evaluating the degree of denudation provides important geological information that can aid in data interpretation. The results of the study can also have significant reference value in furthering our understanding of the post-ore deformation of deposits and in the investigation of unknown orebodies in northeast Vietnam. There indicate that, the research's findings suggest that the use of singularity analysis to evaluate the degree of denudation is a valuable tool for exploring potential gold deposits and enhancing our knowledge of gold deposit geology in northeast Vietnam. Overall, this study contributes to the existing body of knowledge on gold deposits in the Song Hien Rift basin and can serve as a useful reference for future research in the area.
    Źródło:
    Inżynieria Mineralna; 2023, 2; 311--318
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Identifying Correlation of Coal Seams in the Tien Hai Area, Northern Vietnam by Using Multivariate Statistic Methods
    Autorzy:
    Khuong The, Hung
    Nguyen, Phuong
    Nguyen, Thi Cuc
    Pham, Nhu Sang
    Nguyen, Danh Tuyen
    Powiązania:
    https://bibliotekanauki.pl/articles/2019233.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    identifying correlation of coal seams
    multivariate statistic methods
    Tien Hai area
    Northern Vietnam
    pokłady węgla
    północny Wietnam
    rejon Tien Hai
    Opis:
    In northern Vietnam, the Tien Hai area is considered a high potential area of coal deposits. Two hundred fifty-six geochemical coal samples of 13 cores in the Tien Hai area investigate coal seams and coal deposits to identify the correlation of coal seams. According to the statistical method and cluster analysis of geochemical samples, the results indicate that the Mg, V, As, Ca, Zn, Cr, Co, K, Na, Sr, Fe, Ge, Re, U, Mo, Th, and Ga elements are good indicator elements of the major and trace elements in coal. Most of them comply with the normal or lognormal distribution rules. Besides, the Yb, Sc, Ho, Er, Tm, Lu, Y, Tb, Pr, Dy, and Sm elements are also good indicator elements for rare earth elements in the region. Therefore, the selected elements are used to identify the correlation of the coal seams in the Tien Hai area. Based on the similarity degree between studied objects, the results of grouping boreholes in coal seams show that the correlation of coal seam TV2-11 is suitable and acceptable, the coal seams TV3-6a, TV3- 6b, and TV3-6c can be grouped into the coal seam TV3-6. These results present that the models can help study geochemical coal samples and identify the correlation of the coal seams in the Tien Hai area. Additionally, the statistical analysis shows a remarkable degree to determine the correlation of the coal seams. Geochemical coal data can help to evaluate the indicator elements of the major, trace elements, and rare earth elements in coal seams and coal rashing of adjoining and pillar rocks in the Tien Hai area, northern Vietnam.
    Źródło:
    Inżynieria Mineralna; 2021, 2; 129--148
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Polymetallic Nodules Resource Estimation in the Suoi Thau-Sang Than Area, Northeastern Vietnam
    Ocena zasobów konkrecji polimetalicznych w rejonie Suoi Thau-Sang Than, północno-wschodnim Wietnamie
    Autorzy:
    Hung, Khuong The
    Sang, Pham Nhu
    Phuong, Nguyen
    Dung, Nguyen Tien
    Bui, Hoang‑Bac
    Nguyen, Quoc Phi
    Bui, Viet Sang
    Powiązania:
    https://bibliotekanauki.pl/articles/318903.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Przeróbki Kopalin
    Tematy:
    polymetallic nodules
    resource estimation
    Suoi Thau-Sang Than area
    northeastern Vietnam
    konkrecja polimetaliczna
    szacowanie zasobów
    obszar SuoiTthau-Sang Than
    północno-wschodni Wietnam
    Opis:
    1,720 chemical, mineral, and petrography samples in the Suoi Thau-Sang Than area, northeastern Vietnam were collected to investigate polymetallic nodules resource. The similarity-analogy in ore geology, direct calculation method for metallization parameters, and mineral resource estimation based on cutoff grade change methods are employed to estimate polymetallic nodules resource from the Suoi Thau, Sang Than, and Ban Kep areas in northeastern Vietnam. The similarity-analogy in ore geology indicates 1,785,000 tons Cu, 12,005,000 tons Pb+Zn, and 195 kg Au in total. The direct calculation method for metallization parameters shows 2,060,000 tons Cu, 13,648,000 tons Pb+Zn, and 224 kg Au in total. These methods display that the Sang Than area contains mainly polymetallic nodules in the studied area. Following the mineral resource estimation based on cutoff grade changes, estimation results indicate potential Pb-Zn nodules resource in the Ban Kep and Cu nodules resource in the Sang Than, while no potential Au nodules resource in the Suoi Thau and the Sang Than as well as the Ban Kep. The estimation results obtained from mineral resource estimation based on cutoff grade changes are suitable with the results from the traditional geometric block methods. Our study suggests that the Sang Than area can be considered as a potential Cu nodules resource, and the Ban Kep area is potential Pb-Zn nodules resource in northeastern Vietnam for future exploitation, while there is no potential polymetallic nodules resource in the Suoi Thau area. Furthermore, the one resource estimation based on cutoff grade changes method displays an overview of the prospect on polymetallic nodules resources, indicating that this method can serve as a basis for the proposed selection of the prospective areas for effective Cu, Pb-Zn, and Au mineral exploration in the Suoi Thau-Sang Than area, northeastern Vietnam.
    W celu zbadania zasobów konkrecji polimetalicznych zebrano 1,720 próbek substancji chemicznych, minerałów i petrografii z obszaru Suoi Thau-Sang Than w północno-wschodnim Wietnamie. Podobieństwo-analogia w geolo-gii rudy, metoda bezpośredniego obliczania parametrów metalizacji i szacowania zasobów mineralnych w opar-ciu o metody zmian zawartości granicznej są wykorzystywane do szacowania zasobów konkrecji polimetalicz-nych w obszarze Suoi Thau, Sang Than i Ban Kep w północno-wschodnim Wietnamie. Podobieństwo-analogia w geologii rudy wskazuje łącznie na 1,785,000 ton Miedzi, 12,005,000 ton Ołowiu + Cynków i 195 kg Żłota. Meto-da bezpośredniego obliczania parametrów metalizacji pokazuje łącznie 2 060 000 ton Miedzi, 13,648,000 ton Ołowiu + Cynków i 224 kg Żłota. Te metody pokazują, że obszar Sang Than zawiera głównie konkrecje polimeta-liczne na badanym obszarze. Po oszacowaniu zasobów mineralnych na podstawie zmian zawartości granicznej, wyniki oszacowań wskazują na potencjalny zasobów konkrecji Ołowiu - Cynków w Ban Kep i Miedzi w Sang Than, natomiast nie ma potencjalnego zasobu konkrecji Żłota w Suoi Thau i Sang Than, a także w Ban Kep. Wy-niki uzyskane z szacowania zasobów mineralnych na podstawie zmian zawartości granicznej są zgodne z wyni-kami tradycyjnymi metodami bloków geometrycznych. Nasze badanie sugeruje, że obszar Sang Than można uznać za potencjalny zasób konkrecji Miedzi, a obszar Ban Kep jest potencjalnym zasobem konkrecji Ołowiu + Cynków w północno-wschodnim Wietnamie do przyszłej eksploatacji, natomiast w obszarze Suoi Thau nie ma potencjalnego zasobu konkrecji polimetalicznych. Co więcej, oszacowanie zasobu w oparciu o metody zmian zawartości granicznej przedstawia przegląd perspektyw dotyczących zasobów konkrecji polimetalicznych, wska-zując, że metoda ta może służyć jako podstawa do proponowanego wyboru perspektywicznych obszarów efek-tywnych Miedzi, Ołowiu-Cynków i Żłota poszukiwanie minerałów w obszarze Suoi Thau-Sang Than w północno-wschodnim Wietnamie.
    Źródło:
    Inżynieria Mineralna; 2020, 1, 2; 7-14
    1640-4920
    Pojawia się w:
    Inżynieria Mineralna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Statistical evaluation of the geochemical data for prospecting polymetallic mineralization in the Suoi Thau–Sang Than region, Northeast Vietnam
    Autorzy:
    Hung, Khuong The
    Sang, Pham Nhu
    Phuong, Nguyen
    Linh, Vu Thai
    Sang, Bui Viet
    Powiązania:
    https://bibliotekanauki.pl/articles/1841771.pdf
    Data publikacji:
    2020
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    polymetallic mineralization
    statistical evaluation
    Suoi Thau-Sang Than region
    Vietnam
    Opis:
    In Northeast Vietnam, Suoi Thau-Sang Than is considered as a high potential area of polymetallic deposits. 1,720 geochemical samples were used to investigate polymetallic mineralization; thereby polymetallic ore occurrences in this study region were discovered and the statistical and multivariate analysis helps to define geochemical anomalies in some northeastern regions, namely Suoi Thau, Sang Than, and Ban Kep. The statistical method and cluster analysis of geochemical data indicate that the Cu, Pb, and Zn elements are good indicators, and most of them comply with the lognormal or gamma distribution. Based on the third-order threshold, the geochemical anomalies of the content of the Cu, Pb, and Zn elements reflect the concentration of copper forming ore bodies in the mineralized zone, and clearly show the concentration in three distinct zones. The trend surface analysis which was employed to determine spatial variations and relationships among these good indicator elements and anomalous areas revealed relative changes in the content of the indicator elements, and they can be considered as regular. Moreover, the goodness of fit obtained trend functions of Pb and Zn, and Cu elements is a third-degree trend surface model. These results indicate that the models can be useful in studying geochemical anomalies and analyzing the tendency of the concentration of indicator elements in the Suoi Thau-Sang Than region. Additionally, it is suggested that the statistical analysis shows a remarkable potential to use the bottom river sediments in the region to investigate polymetallic mineralization. Moreover, geochemical data can help to evaluate geochemical anomalies of the pathfinder elements and potential mineral mapping of the Suoi Thau-Sang Than region in Northeast Vietnam.
    Źródło:
    Geology, Geophysics and Environment; 2020, 46, 4; 285-299
    2299-8004
    2353-0790
    Pojawia się w:
    Geology, Geophysics and Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sulfur and lead isotope geochemical characteristics of Pb-Zn deposits in the Khau Loc zone, northeastern Vietnam, and their significance
    Autorzy:
    Hung, Khuong The
    Tung, Ta Dinh
    Binh, Do Quoc
    Sang, Pham Nhu
    Cuc, Nguyen Thi
    Linh, Nguyen Thi Hoang
    Tin, Quach Duc
    Powiązania:
    https://bibliotekanauki.pl/articles/2055848.pdf
    Data publikacji:
    2021
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    lead-zinc
    sulfur isotopes
    lead isotopes
    Khau Loc zone
    northeastern Vietnam
    Opis:
    In northeastern Vietnam, the Khau Loc zone is considered to have high potential for lead-zinc mineralization. The lead isotope data for 18 galena samples and 18 ones of δ34S isotope data (including galena and pyrite samples) were collected from lead-zinc ore deposits in some areas in the Khau Loc zone, including Phia Dam, Khuoi Man, Ban Lin, Lung Dam, and Ta Pan. These were employed to investigate the sulfur and lead isotope geochemical characteristics of Pb-Zn deposits and their significance in this study. The samples were analyzed using the LA-ICP-MS to show that the Pb isotopic ratios of 206Pb/204Pb, 207Pb/204Pb, and 208Pb/204Pb in the galena samples range from 17.8908 to 18.6012, 15.5794 to 16.1025, 38.4420 to 39.2118, with the average values of 18.296, 15.749, and 38.812, respectively. The pyrite and galena samples had the δ34S isotope, ranging from 9.0 to 15.106. The sulfur isotope systematics implies that most of the lead-zinc ore formations originated from marine sedimentary evaporation deposits and magmatic intrusion-volcanic eruption sources rich in silica. The distribution of lead isotopic ratios had a well-defined cluster for each deposit, indicating the formation of lead-zinc deposits and lower crust and orogen trends. In addition, these findings of lead isotopic ratios and δ34S isotopes proved that the Khau Loc zone is an activated structure with continuous growth in continental crust thickness during the early Proterozoic and Cenozoic periods. Furthermore, the study results also presented the evolution of material sources involved in the formation of lead-zinc ores in the Khau Loc zone.
    Źródło:
    Geology, Geophysics and Environment; 2021, 47, 3; 143--157
    2299-8004
    2353-0790
    Pojawia się w:
    Geology, Geophysics and Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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