Inverse analysis for transmissivity and the Red river bed's leakage factor for Pleistocene aquifer in Sen Chieu, Hanoi by pumping test under the river water level fluctuationThe determination of the exact boundary condition kinds, boundary values and aquifer parameters values for the areas along the Red river as well as for the areas of boundary of the Pleistocene aquifer with the bed rock in the West and South-West areas of the Red river plain have a very important role in the of the natural groundwater resourc...
13 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 529 | Lượt tải: 0
Determination of ground displacement of 25 April 2015 Nepal earthquake by GNSS precise point positioningTo monitor the effect of the earthquake with the magnitude of 7.8 on 25 April 2015 in Nepal, we collected and processed GNSS data at 17 stations around the epicenter by using the GNSS PPPC method. The GNSS station displacements are calculated precisely with an accuracy of 1cm in the horizontal and the vertical components. These displacements ...
9 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 546 | Lượt tải: 0
Estimation of errors in determination of main parameters of earthquake hypocenter, recorded by the national seismic network of VietnamThe results of error estimation of epicenter coordinates and focal depth, recorded by the national network of 30 seismic stations of Vietnam allow drawing the following conclusions: The existing national seismic station network of Vietnam allows determining epicenter coordinates and focus depth in most of Vietnam territory with the errors Δh ≤...
16 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 556 | Lượt tải: 0
Land cover mapping in Yok Don National Park, Central Highlands of Viet Nam using Landsat 8 OLI imagesFor developing a detailed forest cover map, where the region is the tropical monsoon, along of the rainy season and the dry season is distinctive, with evergreen and deciduous forests. The first: optical satellite data from the dry season to help us accurately distinguish of evergreen forests and deciduous forests. The results indicated that to...
14 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 550 | Lượt tải: 0
Assessment and Simulation of Impacts of Climate Change on Erosion and Water Flow by Using the Soil and Water Assessment Tool and GIS: Case Study in Upper Cau River basin in VietnamFrom the results, in Upper Cau River system, it includes that the total annual runoff tends to increase compared with the baseline under the climate-change scenario B2. The change's rate of the later periods is bigger than the previous ones, appropriate with the changing tendency of evaporation and rainfall, which are the most important factor...
17 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 558 | Lượt tải: 0
Application of directional derivative method to determine boundary of magnetic sources by total magnetic anomaliesBy studying and applying the directional gradient of magnetic anomaly field to determine the boundaries of magnetized objects based on numerical models as well as actual magnetic anomaly data in Tuan Giao area, it is possible to make the following remarks: In case the magnetic anomaly sources are narrow in width and their structure extends in...
16 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 500 | Lượt tải: 0
Mapping land cover using multi-Temporal sentinel-1A data: A case study in HanoiThe proposed method in this paper allows classifying land cover maps in delta area with complex land cover types. However, the limitations of SAR image, including terrain shadows, speckle noise, and similarity in the surface texture of land cover objects can cause confusions in classification result. By combining standard deviation, mean backsca...
15 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 532 | Lượt tải: 0
Preliminary study on phytogeography of Dipterocarpaceae Blume family in VietnamAnalyzing geographical distribution of the Dipterocarps family of Vietnam shows that family has concentrately distributed in Indochinese floristic region, concurring with originative centre in Burma (Myanmar). There are 5 endemic species for 4 floristic provinces, covering whole Vietnam territory, belonging to Indochinese floristic region, whil...
8 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 563 | Lượt tải: 0
Mineralogical characteristics of graphite ore from Bao Ha deposit, Lao Cai Province and proposing a wise useBao Ha graphite ore occurs in massive form. The graphite is characterized as disseminated flake graphite, which occurs as distorted clusters of flaky plates/flakes within 50÷500 m (Figures 2-5). Graphite flakes associated intimately with the impurities even at very small scale (~10 m) (Figures 9-11). Based on XRD measurement combining with B...
13 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 523 | Lượt tải: 0
U-Pb detrital zircon geochronology of sedimentary rocks in NE Vietnam: Implication for Early and Middle Devonian PalaeogeographyDetrital zircons from two Devonian siliciclastic rocks, the Van Canh and the Van Huong Formations from the Do Son Peninsular (NE Vietnam) were analyzed for U, Th, and Pb isotopes by LA-SF ICP-MS techniques. The youngest zircon of each formation exhibits maximum ages of sedimentation at 407.1±9.5 Ma (Van Canh Formation) and 406.3±4.0 Ma (Van H...
21 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 524 | Lượt tải: 0
