Tổng hợp tài liệu Khối Ngành Xã Hội tham khảo cho học sinh, sinh viên.
The soil degaradation and desertification are affects resulting from the loss of the ecological balance by the natural processes and socio-economical activities in the arid, semi-arid and dry sub-humid areas. According the geo-synthetization, the soil degradation is a main cause leading to the desertification. In Central Southern of Vietnam, ...
8 trang | Chia sẻ: honghp95 | Ngày: 28/11/2020 | Lượt xem: 553 | Lượt tải: 0
Application of modis data to support natural resource and environment management The paper introduces a new methodology in maps compiling from MODIS data to support environment and natural resource management. This is one of78 the research results of the basic research project 7009 06 titled : “Trial application of grid computing in environm...
8 trang | Chia sẻ: honghp95 | Ngày: 28/11/2020 | Lượt xem: 568 | Lượt tải: 0
Probabilistic seismic hazard assessment for Ba Ria - Vung Tau Based on recent researches on tectonic and seismic activities in the southern part of Central Vietnam, seismic hazard assessment for Ba Ria - Vung Tau is done by probabilistic approach. The results show that, at the returned period of 475 years, the PGA on rock site range from 0.0...
8 trang | Chia sẻ: honghp95 | Ngày: 28/11/2020 | Lượt xem: 638 | Lượt tải: 0
Corner frequency and rupture area of Dienbien earthquake one of the most important parameters of the earthquake source model is the affected area at the source. Generally, this area is determined by observation instruments or by estimation from calculations based on equations related to the released energy such as magnitude. Brune (1970) co...
5 trang | Chia sẻ: honghp95 | Ngày: 28/11/2020 | Lượt xem: 702 | Lượt tải: 0
The equatorial electrojet model with champ satellite data The EEJ (Equatorial Electrojet) is a complex current system flowing in the ionospheric E-layer. Its value changes in space and in local time. The magnetic signature of the EEJ overlaps on the recorded magnetic data and the amplitude of the EEJ magnetic signature is very small with res...
10 trang | Chia sẻ: honghp95 | Ngày: 28/11/2020 | Lượt xem: 627 | Lượt tải: 0
Investigation of tsunami sources, capable affecting to the Vietnamese coast Based on the analysis of tectonic feature and geodynamic characteristics of regional faults systems in the South East Asia, nine capable source zones of generating tsunamis that can be affected to the Vietnamese coast were delineated in the East Vietnam Sea and adjac...
12 trang | Chia sẻ: honghp95 | Ngày: 28/11/2020 | Lượt xem: 568 | Lượt tải: 0
Characteristic of groundwater in coastal sand area of Central Vietnam and orientation for exploitation and utilization Groundwater in the Quaternary sediment of coastal sand area of central Vietnam is fresh water only on spot that can be exploited for living and socioeconomic development in the area. However, reserve of fresh groundwater is ...
10 trang | Chia sẻ: honghp95 | Ngày: 28/11/2020 | Lượt xem: 639 | Lượt tải: 0
Status quality surface sediment in the Hai Phong coastal area had been carried out studying nutrient (NTotal, PTotal, STotal, COrganic), heavy metals (Cu, Pb, Zn, Cd, As, Hg), pesticide ( lindan, aldrin, 4,4-DDD, endrin, 4,4-DDT, diedrin, 4,4-DDE), oil-grease and cyanide. The concentrations of nutrient were included: NTotal was in a ranged 155....
20 trang | Chia sẻ: honghp95 | Ngày: 28/11/2020 | Lượt xem: 552 | Lượt tải: 0
This paper presents a new approach to assess the safety of fixed offshore structures of Jacket type for oil and gas exploitation in deepwater areas, basing on the total structural reliability determined by “the expanded strength condition”, that is the one in taking into account of the real structural state in damage due to fatigue cumulative du...
18 trang | Chia sẻ: honghp95 | Ngày: 28/11/2020 | Lượt xem: 688 | Lượt tải: 0
In this study, the author present the calculating method interaction between underground structure and coral foundation under earthquake and hydrostatic load. The problem analysis with finite element method and using plane strain three nodes triangular element and 2D slip element (for slip layer between underground structure and coral foundatio...
13 trang | Chia sẻ: honghp95 | Ngày: 28/11/2020 | Lượt xem: 601 | Lượt tải: 0
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