Prediction of maximum earthquake magnitude for northern Vietnam region based on the gev distributionOn the basis of the catalog of independent earthquakes in period 1972-2014, the maximum earthquake magnitude value was assessed for the Northern Vietnam using GEV method. We obtained the following sample estimates for this catalog with T = 350 days: = - 0.178 ± 0.08 ; = 0.23 ± 0.08; = 4.39 ± 0.16; This distribution can be characteriz...
6 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 643 | Lượt tải: 0
Study of the morphology of the low-Latitude D region ionosphere using the method of tweeks observed at Buon Ma Thuot, Dak LakObserving 23073 tweeks with the first to eighth harmonics using the UltraMSK receiver installed at Tay Nguyen University (12.65°N, 108.02°E) during January - June 2013, we have studied the morphology of the nighttime D region ionosphere. We can conclude as follows, - The second to third harmonic tweeks occurred often. The tweeks with the hi...
12 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 539 | Lượt tải: 0
Effect of the change of climate indicators on agricultural yields in Son La provinceDue to the impact of climate change, the climate indicators in Son La province change according to the following trends: (i) the total annual heat increases; (ii) the period of winter tends to shorten; (iii) the absolute lowest annual temperature tends to rise; (iv) the amount of evaporation tends to increase. Therefore, production period of som...
11 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 593 | Lượt tải: 0
TEC variations and ionospheric disturbances during the magnetic storm in March 2015 observed from continuous GPS data in the Southeast Asia regionBased on the observations and calculations, we can draw some conclusions: The results of TEC calculation by using the combination of the phase and pseudo range measurements are less dispersed than those by using only the pseudo range measurements. The magnetic storm whose the main phase stated on 17 March 2015 was the big storm. The minimu...
19 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 616 | Lượt tải: 0
Quantifying organic carbon storage and sources in sediments of Dong Rui mangrove forests, Tien Yen district, Quang Ninh province using carbon stable isotopeThe present study showed that the fine sediment grained size fractions (< 63 µm) varied in a large range from 8.58 to 82.10%, and TOC and TN contents ranged from 0.21 to 10.20% and 0.01 to 0.34%, respectively. The TOC and TN contents tended to decrease with sediment depth and the fine sediment grained size fractions. The total OC storage in ...
10 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 492 | Lượt tải: 0
Preliminary assessments of debris flow hazard in relation to geological environment changes in mountainous regions, North VietnamDebris flows are disastrous that are difficult to predict due to forming condition localized and complicated. This is the main difficulty in warning and zoning forecast. Debris flows in northern mountainous regions of Vietnam occur mainly in the proluvial and colluvial deposits or tectonic breccia zones. These soil-rocks mixed masses are we...
10 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 1441 | Lượt tải: 0
Some study results of Cam Ranh - Binh Thuan mud eruption stripWith regards to the origin of erupted mud material: clay mud is not deep level-derived (in the deep lithosphere layer), but is from shallow part in the crust. The mud contains alkaline bentonite clay formed in a tectonic subsidence zone. The origin of this clay mud is formed by chemical weathering and hydrolysis processes of alkali-rich mine...
21 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 573 | Lượt tải: 0
Magma source feature and eruption age of volcanic rocks in the Tram Tau district, Tu Le BasinThe Sr and Nd isotopic compositions of volcanic rocks in the Tram Tau district (and Tu Le basin, in general) are highly enriched for a mantle source, suggesting involvement of crustal melts. To produce magmatic melts having 87Sr/86Sr ratio from 0.7058 to 0.7094, a mantle-derived melt with strontium isotopic ratio of 0.703 has to mix with cru...
14 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 560 | Lượt tải: 0
Algorithm and program for earthquake prediction based on the geological, geophysical, geomorphological and seismic datanew algorithm and a maximum earthquake prediction program according to geological, geophysical, geomorphological and seismic data have been established. The program includes a system of windows, enabling the selection and addition of different parameters characterizing the seismogenic possibility of the Earth’s crust. The program allows not ...
11 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 517 | Lượt tải: 0
Seawater desalination using air gap membrane distillation – an experimental study on membrane scaling and cleaningAGMD of an actual seawater feed were investigated. The experimental results demonstrate a profound influence of feed salinity and operating temperature on water flux, scaling behavior, and the efficiency of subsequent membrane cleaning. Feed salinity reduced the water flux of the AGMD process with seawater compared to that with fresh water, part...
8 trang | Chia sẻ: honghp95 | Ngày: 30/11/2020 | Lượt xem: 513 | Lượt tải: 0
