Đa dạng của nhóm cây cho dầu và nhựa ở vườn quốc gia Pù Mát và hiện trạng khai thác, quản líKết quả nghiên cứu cho thấy ở Vườn Quốc Gia Pù Mát có 136 loài cây rừng cho nhựa và dầu, thuộc 96 chi, 43 họ thực vật bậc cao có mạch. Trong đó có 7 loài quý hiếm, có tên trong Sách Đỏ Việt nam (2007) [5] và danh lục đỏ của IUCN. Lối sống phụ thuộc vào khai thác rừng, sự hiểu biết hạn chế của cộng đồng, thiếu biện pháp quản lí hiệu quả, thị trườ...
7 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 580 | Lượt tải: 0
Sea-Level rise and resilience in Vietnam and the AsiaPacific: A synthesisSLR is related in a multidimensional way to storms and changing precipitation patterns. All three elements contribute to flood risks, of which the hazards increase fast in urban areas, in particular in the deltas and the southern lowlands of the country. SLR affects coastal erosion, biodiversity and landscape damage along the coasts and the...
27 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 778 | Lượt tải: 0
Human exposure to radon radiation geohazard in Rong Cave, Dong Van Karst Plateau Geopark, VietnamRadon concentrations in the air of Rong Cave exceeded WHO-recommended safety thresholds (UNSCEAR, 1993, 2008) except from February to April during ‘cold and dry’ weather conditions. Rong Cave’s thoron (220Rn) concentrations are far higher than the respective WHO-recommended safety level. 222Rn concentrations in Rong Cave exceed the TCVN-788...
11 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 637 | Lượt tải: 0
A study on the variation of zeta potential with mineral composition of rocks and types of electrolyteIn this work, streaming potential measurements are performed for five rock samples saturated with six different electrolytes. From measured streaming potential coefficients, the zeta potential is deduced. The theoretical model is then used to explain the experimental data. Based on the model, the surface site density for different rocks and th...
8 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 707 | Lượt tải: 0
Soil structure and soil organic matter in water-Stable aggregates under different application rates of biocharElevated doses of biochar with a higher level of N fertilizer application significantly increased the index of aggregate stability and the proportion of water-stable macroaggregates, especially in the size fractions from 3 to 2 mm. On the other hand, less water-stable macro-aggregates within the fraction from 0.5 to 0.25 mm were observed. Appli...
12 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 631 | Lượt tải: 0
Assessment of earthquake-Induced liquefaction hazard in urban areas of Hanoi city using LPI-based methodIn this study, the LPI-based method was applied to evaluate the earthquake-induced liquefaction potential for the urban area of Hanoi city. Using a dataset of 120 boreholes logs, the “simplified procedure” to evaluate the liquefaction of soil layers in every borehole point. The Liquefaction Potential Index (LPI) was calculated for the whole s...
19 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 587 | Lượt tải: 0
Spatial variations of arsenic in groundwater from a transect in the Northwestern HanoiThe arsenic concentrations of the B-B’ transect vary in a wide range: from <5 to 115 µg/L, with the lowest average concentration at Cam Yen and the highest one at Van Phuc. The As release process depends on many factors such as the extent of the reducing conditions, the sediment age, bacteria activities, etc. From the results, one can predict ...
8 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 530 | Lượt tải: 0
Geochemical features of Sakhalin Island mud volcanoesDeep shears are the supply channels for both fluids from sedimentary basins (hydrocarbons) and magmatic rock fluids (helium, hydrogen, carbon dioxide). The mud volcanic gas emission from sedimentary basins is enhanced during seismic activity. The presence of active mud volcanoes and mineral springs proves the activity of deep faults, through ...
14 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 575 | Lượt tải: 0
Study of impurity in blue spinel from the Luc Yen mining area, Yen Bai province, VietnamImpurities present in light and saturated cobalt-blue spinel samples collected from Luc Yen mining area (Vietnam) have been studied in details. By using different techniques, including EMPA, UV-VIS-NIR, ESR and XAS, the existence of impurities V, Mn, Ni, Zn, Ti, Cr, Fe, Co, and Ca were identified. Among those impurities, the oxidation state o...
9 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 448 | Lượt tải: 0
Improvement of the accuracy of the quasigeoid model VIGAC2017Above represented research results show, that on the base of solving the task of fitting the initial quasigeoid model VIGAC2017 to the 194 national quasigeoid heights got from the 194 GPS/first and second orders levelling quasigeoid heights by the least squares collocation, the accuracy of the this model has been increased to to 20,69 %. Tha...
8 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 455 | Lượt tải: 0
