http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/56 2026-05-17T19:23:07Z http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/8943 An assessment of healthcare system accessibility of local communities in Yen Chau District, Son La Province Tran, Anh Tuan; Tran, Van Tuan; [et al.] Son La Hydroelectric Project has designed the plant with the capacity of 2400 MW. It will provide electricity for not only the northwest region but also for the other regions of Vietnam. The project was approved by the Vietnam National Assembly on December 16th, 2002, in detail: Son La Hydroelectric Plant will be constructed mainly in Son La and Lai Chau provinces. It has water reservoir of 16 billion m3. Therefore, there are 13,656 households that have to resettle in new places. Healthcare facility is one of the very important public services for local communities, especially in the case of mountainous district as Yen Chau, Son La Province. Based on the AccessMod extension of ArcView software, we evaluated the mobility of local people as well as the capacities of healthcare system in the study area. The results of the study are showing that: there is only 77% of total population who can access the healthcare system in Yen Chau District. It means that the quality as well as the capacity of healthcare system did not meet the requirement of local people. On the other hand, accessibility is very useful method for assessing the quality of infrastructure system in rural area. It provided the important information of the real condition of public service system for local planners and managers. VNU Journal of Science, Earth Sciences.Vol. 23 (2007), No 4 2007-01-01T00:00:00Z http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/286 Pattern and determinant agents of the debris and mud flash flood in Lay Nua Commune area, the Former Muong Lay District, Dien Bien Province Dao, Dinh Bac; Tran, Thanh Ha This paper discusses debris and mud flash flood, which is a widespread phenomenon with different levels of damaging effects and repetition in the mountainous areas of Vietnam. There are some sites where the flash flood with severe debris components has recurred many times and it has always caused heavy loss of human and materials, such as Lay Nua Commune, the Former Muong Lay District, Dien Bien Province. During the 1990s, this kind of severe hazard is recorded to occur every two years in the town of Former Muong Lay District. This leads to the government’s decision to relocate the town to another place. Some characteristics of physiographical conditions such as climate, relief, lithologic and tectonic features, which are considered relevant to debris and mudflows activities, are analyzed, and then come to the conclusions on determinant agents of debris and mud flash flood in this area. VNU Journal of Science, Earth Sciences.Vol. 23 (2007), No. 4, P. 203‐212 2007-01-01T00:00:00Z http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/285 On the detection of gross errors in digital terrain model source data Tran, Quoc Binh Nowadays, digital terrain models (DTM) are an important source of spatial data for various applications in many scientific disciplines. Therefore, special attention is given to their main characteristic ‐ accuracy. At it is well known, the source data for DTM creation contributes a large amount of errors, including gross errors, to the final product. At present, the most effective method for detecting gross errors in DTM source data is to make a statistical analysis of surface height variation in the area around an interested location. In this paper, the method has been tested in two DTM projects with various parameters such as interpolation technique, size of neighboring area, thresholds,... Based on the test results, the authors have made conclusions about the reliability and effectiveness of the method for detecting gross errors in DTM source data. VNU Journal of Science, Earth Sciences. Vol. 23 (2007), No. 4, P. 213‐219 2007-01-01T00:00:00Z http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/284 Paleomagnetism of cretaceous continental redbed formations from Indochina and South China, their Cenozoic tectonic implications: a review Cung, Thuong Chi Available paleomagnetic data of Cretaceous redbed formations from Indochina and South China blocks are compiled and their tectonic significance is reviewed in a common reference frame of the Eurasian coeval paleopoles. The important factors that play a vital role in determining the tectonic significance of a paleomagnetic result have been taken into consideration and discussed. Review of the Cretaceous paleomagnetic data from the South China block further confirms the conclusion of the previous researchers that the present geographic position of the South China block has been relatively stable with respect to Eurasia since Cretaceous time and shows that the paleomagnetically detected motion of a coherent lithospheric block must be based on the representative data obtained from different places across the block; so the local tectonic movements can be distinguished. Cretaceous paleomagnetic data from the Indochina ‐ Shan Thai block reveal complex intraplate deformations that have been occurred due to the India ‐ Eurasia collision. Paleomagnetically detected motions from the block‐margin areas are mainly reflecting the displacement of upper crustal blocks due to folding and faulting processes, thus a rigid lithospheric block rotation and translation cannot be assumed. The paleomagnetic results from the areas located next to the south of the Red River fault suggest that the fault does not demarcate non‐rotated and significantly rotated regions. Accordingly, given the difficulty in separating true lithospheric plate motions from those of superficial crustal blocks, we advocate extreme caution in interpreting the paleomagnetic record in regions such as Indochina where block interaction and strong deformation are known to have occurred. VNU Journal of Science, Earth Sciences. Vol. 23 (2007), No. 4, P. 220‐230 2007-01-01T00:00:00Z