Methodology of determining effective porosity and longitudinal dispersivity of aquifer and the application to field tracer injection test in Southern Hanoi, VietnamIf only the solute concentration of GW inside the pumping well is measured, the GW solute transport parameters can only be determined based on the relative solute concentrations; Only numerical modeling is capable of determining the GW solute transport parameters (effective porosity and dispersivity) of the aquifer under tracer injection testing...
18 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 634 | Lượt tải: 0
New discovery of prehistoric archaeological remnants in volcanic caves in KrongNo, Dak Nong ProvinceThere are many archaeological sites in the Krong No Volcanic Geopark area, particularly in the volcanic caves. Preliminary surveys from cave C1 to cave C6.1, we have found prehistoric archaeological sites containing pieces of evidence of early human settlement and tool making in the volcanic caves. These are the first prehistoric archaeological ...
12 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 566 | Lượt tải: 0
Empirical Attenuation relationship for Peak Ground Horizontal Acceleration for North-East HimalayaA data set of 216 peak ground horizontal accelerations from 24 earthquakes (4.0 ≤ M ≤ 6.8) recorded by strong-motion arrays and National Strong Motion Network project have been utilized to develop empirical attenuation relationship for peak ground horizontal acceleration for North-East Himalayan region. Using two-step stratified regression mode...
11 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 588 | Lượt tải: 0
Study on active tectonic faults using soil radon gas method in Viet NamThe results of soil radon gas measurements in 3 different areas showed differences in expression levels of fault activity as follows: In the Thac Ba hydropower plant area, Song Chay fault shows clear activity expression and right slip motion in recent time with maximum KRn = 9.75 (high level). In the Song Tranh 2 hydropower plant area, faul...
20 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 577 | Lượt tải: 0
General characteristics of rare earth and radioactive elements in Dong Pao deposit, Lai Chau, VietnamThe Dong Pao deposit is rich in light rare earth elements such as La, Ce, Pr and Nd, their total concentration approximates 10 wt.% in the weathered zone. The mass contents of uranium and thorium in the studied REE deposit are comparable reaching about 0.01 wt.% and 0.001 wt.% in the upper weathered and lower limestone and dolomite zones re...
13 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 738 | Lượt tải: 0
Eruptive-Volcanic-basalt structures in the Truong SaSpratly Islands and adjacent areas from interpreting gravity and magnetic dataThe method of multi-dimensional correlation analysis between the high-frequency gravity, magnetic anomalies with weighted total gradient 3D allows determining quite accurately the ranges as well as the spatial locations of the eruptive volcanic basalts in the Spratly Islands and adjacent areas. The diversity of the formation and the complex ph...
13 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 577 | Lượt tải: 0
Utilization of seismic refraction data for the study of structure of Bang hot-Water source, Le Thuy, Quang BinhA good quality seismic data was recorded by all the deployed instruments in the area of the hot water spring Bang - Quang Binh. The limitation in length of the measurement profiles caused by the complexity of the local condition is restricted the investigation depth in a range of 2 - 3 km. The velocity structural models under 4 profiles con...
16 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 580 | Lượt tải: 0
Petrography and geochemistry of Permian basalts of the Cam Thuy formation and their relation to Song Da and Emeishan magmatic rocksCam Thuy Permian volcanic rocks exposed in the Lam Son area (Tho Xuan, Thanh Hoa province) comprise thick basaltic lava flows and pyroclastic layers, with a total thickness exceeding a few hundred meters. The rock types are mostly olivine-phyric basalt and a minor amount of alkaline basalt and (quartz-normative) tholeiitic basalt. The compu...
21 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 657 | Lượt tải: 0
Characteristics of elemental and organic carbon in atmospheric nanoparticles at different sampling locations in VietnamThe atmospheric carbonaceous components, particularly OC, EC, char – EC and soot – EC in the NPs, were measured in a rainy season and a dry season (August to December) at the two locations in Hanoi, Vietnam. It was found that OC accounts for 78.6 – 81.5 of TC in the NPs at the Vinacomin site, and 83.7 – 85.0 % of TC in the NPs at HUST site. The ...
11 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 618 | Lượt tải: 0
Effect of silicic acid on aggregation of hydrous ferric oxideIn natural waters, silicic acid occurs almost exclusively in the form of the monomer (Si(OH)4) or dimer (Si2O2(OH)5-) (Svensson et al., 1986; Dietzel, 2000). Variation in protonation/deprotonation and/or polymeric condensation can potentially yield other dissolved species (e.g. oligomeric silicic acids) (Iler, 1979; Dove and Rimstidt, 1994; ...
11 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 617 | Lượt tải: 0
