Journal articles on the topic 'Hanoi (Viet-Nam) – Vietnam'

The aerosol fraction distribution in Vietnam was determined based on monitoring data LIDAR at Hanoi and GEOS–Chem using back-trajectory statistical methods. The results showed that the aerosol concentration is the highest in northeastern of Vietnam and decreasing in the southern and western directions. Maximum of organic aerosol concentration is on the north-west. The highest sea salt aerosol concentrations are in East sea and Bengal bay. Aerosol consists mainly of sulfate, organic aerosol, and sea salt aerosol: sulfate, nitrate, black carbon, ammonium, mineral dust aerosol… The result shows the complicated aerosol distribution in Vietnam.

The process of urbanization is taking place fast and vigorously in large urban and peri-urban areas in Vietnam. According to national forecasts, the rate of urbanization nationwide will reach 39.3% by 2020 and 50-55% by 2035. Thai Nguyen is a province in the midland and mountainous region. The province is located at the northern gateway and bordered with Hanoi capital. In recent years, the agricultural land area of Thai Nguyen province has narrowed due to the urban-industrial development. Urban agriculture development is an inevitable direction, creating safe and high quality food products, protecting the ecological environment, and increasing people's income. Thai Nguyen is one of the provinces promoting sustainable urban agricultural development. Secondary and primary data sources are analyzed and synthesized by descriptive statistical methods. The article will analyze five groups of factors affecting urban agricultural development in Thai Nguyen province in the period 2015-2018, including Socio-economic; Natural conditions and infrastructure; Policy factors; Planning factors; Links and integration.

The modified Eco-Bio-Block (EBB) has been studied and manufactured in Viet Nam, based on the process of blending friendly environmental materials as activated carbon, zeolite, kazemzite, sand and useful microorganisms. After culturing, bacterial communities in the modified EBB became significant abundant by DGGE analysis of 16S rDNA. The amount of microorganisms in the modified EBB was 107 CFU/g bacteria communities (Prokaryote). After 2 months treatment with the modified EBB, the quality of Khuong Thuong lake water has been significantly improved; the concentration of COD, NH4+, Coliform and Chlorophyll-a are reduced by 65.51 %, 64.28 %, 50 % and 68.42 %, respectively at the location A1. Sensuously, the lake water became brighter and cleaner. The application of the modified EBB to improve the lake water quality was conducted appropriately to the conditions at Vietnam in general and at Hanoi in particular. This research aims at localizing technology and improving efficiency on pond/lake water treatment. Further goal of the modified EBB application is to reduce pollutants in domestic wastewater form residential areas, in ditches, creeks and small lakes in Viet Nam.

The importance of REE for modern industries is proved by the high demand. The abundance of REE is richer than that of noble metals like gold or silver. However, supply sources are concentrated in China. The share of the product of REE was highest in 2009 (over 90%) and that is used as a national strategy.Mining industry in Vietnam is mainly developed in northern part. Deposits of principle metals are located around Hanoi, and REE deposits (Dong Pao) is also explored in Lai Chau Province. On the other hand, few bauxite mine is in southern Vietnam and the REE exploration is not conducted enough. Therefore, the study about REE in southern Vietnam is significant. Samples are from mainly basalt and granite. REE pattern, which is normalized by the abundance of chondrite, of basaltic rocks and laterites shows that is decreases monotony. That amount of REE is low (50-180ppm). REE pattern of magnetite rocks and laterites has no Eu and Ce anomaly. On the other hand, illuminate rocks and laterites have strong negative Eu anomaly. Clay minerals were observed by XRD analysis using hydraulic elutriation. The result of REE pattern and sequential extraction, it is indicated that the form of HREE is changed and adsorbed to clay and LREE is leached out. In tailing in Stop 16, it is observed that the concentration of HREE (about 3 times to 5 times than that of before washing). Eu anomaly is affected by reductive environment of the cooling of magma, and it is considered that Ce anomaly is occurred by the change of Ce form (Ce3+ to Ce4+). CeO2 is insoluble to water in the soil. From the XRD analysis, the cause of HREE concentration in water treatment is considered by the clay mineral

Equitization and divestment continue to be one of the crucial pillars of the economic development strategy over the period 2020-2030. The Vietnamese Government has been completing the legal framework to speed up the process of privatization and divestment over the past 3 years. One of the highlights is the regulation on the application of Book Building (BB) Method to offer state shares in 2018. BB, an effective mechanism to determine the price on the primary market, is encouraged to apply on most markets. However, according to Hanoi Stock Exchange, for four months since Circular 21/2019/BTC-TT was released, 17 announcements of IPOs or divesture of state capital were whole lot sale auction or competitive offering. This implies the popularity of fixed price and discriminatory auction in Vietnam. Moreover, applying BB in Vietnam requires certain adjustments to theories. This paper presents the advantages and disadvantages of BB over fixed price and auction, reviews BB experiences of some economies, and make recommendations on the application of BB in offering state shares in Vietnam. Given that BB is expected to create a transparent and effective pricing mechanism and enhance the success of state share offering, this study indicates some points that need clarifying or adjusting to the current regulation, including (i) initial price and price range; (ii) time for disclosing information and opening order books; (iii) objectives of BB; (iv) cancel the results of BB; (v) selection of underwriters.

Introduction: Atrial Septal Defect is the most common congenital heart disease. Minimally invasive cardiac surgery is being perfomed routinely at several cardiovascular centers in Vietnam. At E Cardiovascular Center, from 2016 to 2019, we performed total endoscopic closure for atrial septal defect in children using 4 trocars. From 2020 to present, we have reduced the number of trocars to three. This report was to evaluate the effectiveness and early results of total endoscopic closure with 3 trocars for atrial septal defect in children. Method: Twelve children underwent ASD closure from 1/2020 to 5/2021, with mean age of 7.7 years old (range from 2.5 to 11); mean weight was 20.8 kilograms (range from 12 to 40). All the patients underwent the operation with peripheral cardiopulmonary bypass (CPB). Result: The mean peripheral circulation time was 70 minutes (range from 56 to100 minutes) on beating hearts. There were 8 cases with patch-closure and 4 cases with direct-closure. After operations, we reexamined by echocardiography, the atrial septal defects were closed completely with no residual shunt, the common femoral arteries at the cannula position were normal and no stenosis were present. Conclusion: Totally endoscopic closure for ASD on beating hearts with 3 trocars is save with a very good short-term results.

This study was conducted with the purpose to identify the effectiveness of Systemic Functional Linguistic approach to improve writing skills for the EFL students at a university in Hanoi, Viet Nam. The preliminary investigation showed that most students at this university experienced many difficulties in English writing skills and they were not motivated in writing lessons. To make situation better, an action research plan was conducted with the use of quantitative and qualitative methods, focusing on applying Systemic Functional Linguistic approach, typically Theme-Rheme patterns to raise the students’ awareness of Theme-Rheme benefits in creating logical text organization and then improve their writing skills. The subjects of the study were 30 students of English major at a university of foreign languages in Vietnam. The data were collected through the pre- and post-tests, questionnaire and semi-structured interviews. The findings of the study suggested that the use of this approach could improve the students’ writing skills and most of research students liked this technique because it made them motivated during English writing lessons.

In this study, the authors synthesise and analyse the re-sults of the 2019-2020 statistical survey on infrastructure and human resources of radiotherapy centers in Viet-nam, thereby assessing the results of the detailed plan-ning on the development and application of radiation in health to 2020, and at the same time assessing the actual radiotherapy utilisation rate of Vietnam. Statistical sur-vey results were analysed to discuss geographic distribu-tion and evaluate the characteristic ratios of PT/LINAC, PT/RO, PT/ROMP, PT/RTT of the radiotherapy centers in the application of LINAC radiotherapy technology. Research results show that although Vietnam has not met its planned target by 2020, it has obtained many achievements in developing a network of radiotherapy centers nationwide and investing in LINAC radiothera-py equipment reaching 0.73 LINAC/mil. people and the actual radiotherapy utilisation rate (ARUR) being 20% with application of advanced technologies such as IMRT, VMAT, IGRT, SRS, SBRT, simulation devices such as CT, MRI, PET/CT. The total number of radiotherapists, medical physicists, and technicians nationwide are 318, 151, and 356 people, respectively. Radiotherapy centers and specialists are highly concentrated in Hanoi and Ho Chi Minh city with 67% of LINAC machines, respond-ing to 80% of patients receiving cancer treatment by LINAC annually. A model for forecasting radiotherapy demand has been proposed and applied to determine the expected number of LINAC machines, human resourc-es needed for the period 2020-2040 to achieve the actual radiotherapy utilisation rate of 25-35% of new cancer cases annually. Accordingly, the number of LINAC ma-chines needed by 2030 and 2040 will reach 1.1 LINAC/million people and 1.7 LINAC/million people. The de-mand for RO, ROMP, and RTT human resources is fore-casted to increase at least by 12, 34, and 67% from 2021 to 2030, respectively, and 71% for all from 2031 to 2040.

In this paper, seismic activity characteristics in the East Sea area was analyzed by authors on the base of the unified earthquake catalog (1900-2017), including 131505 events with magnitude 3 ≤ Mw ≤ 8.4. The seismic intensity in the East Sea during the period 1900-2017 is characterized by the earthquake representative level Mw = 4.7. The strong earthquake activity in the East Sea area clearly shows the regularity in each stage. In the period from 1900 to 2017, the East Sea area has four periods of strong earthquake activity, each stage is nearly 30 years with particular characteristics. The distribution of the maximum earthquake quantities by years has a cyclicity in all four periods. In each stage there are 1-2 strong earthquakes with Mmax ≥ 8.0. The strong earthquakes with Mmax ≥ 7.5 have occurred by a repeatable rule of 3-5 years in all four stages. This allows the prediction of the maximum earthquake repeat cycle of Mmax ≥ 7.5 in the study area is 3-5 years. In other hand, the maximum magnitude values for the East Sea region has assessed by GEV method with several different predict periods (20, 40, 60, 80, 100 years), with predicted probability 80%. We concluded that it is possible that earthquake have Mmax = 8.7 will occur in next 100 years.ReferencesBautista C.B., Bautista M.L.P., Oike K., Wu F.T., Punongbayan R.S., 2001. A new insight on the geometry of subducting slabs in northern Luzon, Philippines. Tectonophysics, 339, 279-310.Bui Cong Que, et al., 2010. Seismic and tsunamis hazard in coastal Viet Nam. Natural Science and Technology Publishing House, 311p.Bui Van Duan, Nguyen Cong Thang, Nguyen Van Vuong, Pham Dinh Nguyen, 2013. The magnitude of the largest possible earthquake in the Muong La-Bac Yen fault zone. J. Sci. of the Earth, 35, 53-59 (in Vietnamese).Cao Dinh Trieu, Pham Nam Hung, 2008. Deep-seated fault zone presents the risk of strong earthquakes in the East and South Vietnam Sea. Scientific Report of the First National Conference on Marine Geology, Ha Long, October, 9-10, 491-497.Hsu Ya-Ju, Yu Shui Ben, Song Teh.-Ru Alex, Bacolcol Teresito, 2012. Plate coupling along the Manila subduction zone between Taiwan and northern Luzon. J. Asian Earth Sci., 51, 98-108.http://www.ioc-tsunami.org/index.php?option=com_oe&task=viewDocumentRecord&docID=16478.http://www.jcomm.info/index.php?option=com_oevàtask=viewDocumentRecordvafdocID=16484.Kirby S., Geist E., Lee W.H., Scholl D., Blakely, R., October 2005. 660 Tsunami source characterization for western Pacific subduction 661 zones: a perliminary report. Report, USGS Tsunami Subduction 662 Source Working Group.Le Duc Anh, Nguyen Hoang., Shakirov RB., Tran T.H., 2017. Geochemistry of late miocene-pleistocene basalts in the Phu Quy island area (East Vietnam Sea): Implication for mantle source feature and melt generation, Vietnam J. Earth Sci., 39, 270-288.Le Huy Minh, Frederic Masson, Alain Bourdiilon, Patrick Lassudrie Duchesne, Rolland Fleury, Jyr-ching Hu, Vu Tuan Hung, Le Truong Thanh, Nguyen Chien Thang, Nguyen Ha Thanh, 2014. GPS data continuously in Vietnam and Southeast Asia. J. Sci. of the Earth, 36, 1-13.Le Van De, 1986. Outline of tectonics of the East Vietnam sea and adjacent areas. Proc. 1st Conf. Geol. Indoch., Ho Chi Minh City, 397-404, Hanoi.Ngo T.L., Tran V.P., 2013. Development of a new algorithm for the separation of seismic and anemone groups from the earthquake list to ensure the independence of events. Journal of Marine Science and Technology, Hanoi, 13(3A), 79-85.Nguyen Dinh Xuyen., et al., 2007. Report on the implementation of the task "Earthquake scenarios for tsunamis in the South China Sea". Institute of Meteorology and Hydrology.Nguyen Hong Phuong, 2015. Estimation of seismic hazard parameters for potential tsunami genic sources in the South China Sea region.Nguyen Hong Phuong, 2001. Probabilistic Seismic Hazard Assessment Along the Southeastern Coast of Vietnam, Natural Hazards, 24, 53-74.Nguyen Hong Phuong, 2004. Earthquake risk map of Vietnam and East Sea. J. Sci. of the Earth, 26, 97-111.Nguyen Hong Phuong, Bui Cong Que, 2012. Investigation of earthquake tsunami sources, capable of affecting Vietnamese coast, Nat Hazards, 64, 311-327.Nguyen Hong Phuong, Pham The Truyen, 2014. Probabilistic Seismic Hazard Assessment for the South Central Vietnam. J. Sci. of the Earth, 36, 451-461.Nguyen Hong Phuong, Pham The Truyen, Nguyen Ta Nam, 2017. Probabilistic Seismic Hazard Assessment for the Tranh River hydropower plant No2 site, Quang nam province, Vietnam J. Earth Sci., 38(2), 188-201.Nguyen Van Luong, Bui Cong Que, Nguyen Van Duong, 2008. Tectonic stresses and modern movements in the crust of the Earth in the East Sea area, Journal of Marine Science and Technology, 46-52.Nguyen Van Luong, Duong Quoc Hung, Bui Thi Thanh and Tong Duy Cuong, 2003. Characteristics of fault systems in the East Sea area. J. Sci. of the Earth., 25, 1-8 (in Vietnamese).Nguyen Van Luong, et al., 2002. Result of establishment of the list of earthquake dynamics in the East Sea area, studies on geology and marine geophysics, VII, Hanoi.Nguyen Van Luong, et al., 2008. Tectonic seismic and geodynamic features of the South China Sea, Proceedings of the 1st National Conference on Marine Geology and Sustainable Development, 9-10, Ha Long, 498-509.Pham Van Thuc and Nguyen Thi Kim Thanh, 2004. Earthquake zone in the South China Sea and coastal areas. Journal of Geology, A series, 285, 11-12.Pham Van Thuc, 2001, Characteristics of tsunamis in the East Sea region of Vietnam. TC and CNN, TI, 2, 52-64.Phan Trong Trinh, Ngo Van Liem, Vy Quoc Hai, John Beavan, Nguyen Van Huong, Hoang Quang Vinh, Bui Van Thom, Nguyen Quang Xuyen, Nguyen Dang Tuc, Dinh Van Thuan, Nguyen Trong Tan, Nguyen Viet Thuan, Le Huy Minh, Bui Thi Thao. Nguyen Huy Thinh, Dinh Van The, Le Minh Tung, Tran Quoc Hung, Nguyen Viet Tien, 2010b. Modern tectonic movement in the East Sea and surrounding areas. Journal of Geology. Series A, 320, 9-10, Hanoi.Phan Trong Trinh, 2006. The Tsunami and December 26, 2004 in the Indian Ocean: A Warning to Vietnam. Journal of Geology, Series A, 293, Hanoi.Phan Trong Trinh, et al., 2010a. Research on the tectonic activity, modern tectonics and geodynamics of the South China Sea as a scientific basis for forecasting the types of catastrophe involved and proposed solutions prevent. KC.09.11/06-10. Institute of Geology, 446p.Phan Trong Trinh, Nguyen Van Huong, Ngo Van Liem, Tran Dinh To, Vy Quoc Hai, Hoang Quang Vinh, Bui Van Thom, Nguyen Quang Xuyen, Nguyen Viet Thuan, Bui Thi Thao, 2011. Geological and geological hazards in Vietnam's sea and nearby. J. Sci. of the Earth, 33, 443-456.Pisarenko V.F., Sornette A., Sornette D. and Rodkin M.V, 2008. New approach to the Characterization of Mmax and of the Tail of the Distribution of Earthquake Magnitudes. Pure and Applied Geophysics, 165, 847-888.Pisarenko V.F, Sornette D. and Rodkin M.V., 2010. Distribution of maximum Earthquake magnitudes in future time intervals: application to the seismicity of Japan (1923-2007). EPS (Earth, Planets and Space), 62, 567-578.Pisarenko V.F., Rodkin M.V, and Rukavishnikova T.A., 2014. Estimation of the Probability of Strongest Seismic Disasters Based on the Extreme Value Theory. Physics of the Solid Earth, 50(3), 311-324.Pisarenko V.F., Rodkin M.V. and et al., 2012. New general quantile approach to the seismic rick assessment application to the Vietnam region. //Proceedings of the International Conference on "Geophysics - Cooperation and Sustainable Development." Science and Technology Publishing House. Hanoi, 161-167.Vu Thanh Ca, 2008. Report on the project to build a map of tsunami warning for coastal areas of Vietnam. Institute of Hydrometeorology and Environment - Ministry of Natural Resources and Environment.Yingchun Liu, Angela Santos, Shuo M. Wang, Yaolin Sh, Hailing Liu, David A. Yuen, 2007. Tsunami hazards along Chinese coast from potential earthquakes in the South China Sea. Phys. Earth Planet. Interiors, 163, 233-244.Zhiguo Xu, 2015. Seismicity and Focal mechanisms in the South China Sea Region and its Tectonic Significances.

AbstractThis paper examines the history of an unknown “mass murder” perpetrated in 1947 in Southern Vietnam by the Viet Minh forces. It was organized in the outskirts of Saigon, mainly against Cao Dai and Hoa Hao religious forces that were portrayed as “reactionary” during their political revolutionary trials. Before presenting and analyzing the data of nearly 900 victims, the paper briefly presents the social, political and military conquest and context of French Cochinchina, as well as explains the political and military ambitions of the Viet Minh forces after the advent of the Democratic Republic of Vietnam in Hanoi on September 2, 1945. The focal point of this article is the review of the data related to the massacre and its uses, i.e.what they can reveal about the course of the massacre, its actors and victims. Finally, the paper's last section assesses the official historiography of the massacre, which has been recognized by the current regime in a 'soft' mea culpa. In conclusion, this article discusses the issue of violence in Southern Vietnam and its consequences for the Socialist Republic of Vietnam in a more long term perspective.

Can Gio mangrove forest (CGM) is located downstream of Ho Chi Minh City (HCMC), situated between an estuarine system of Dong Nai - Sai Gon river and a part of Vam Co river. The CGM is the largest restored mangrove forest in Vietnam and the UNESCO’s Mangrove Biosphere Reserve. The CGM has been gradually facing to numeric challenges of global climate change, environmental degradation and socio-economic development for the last decades. To evaluate sediment quality in the CGM, we collected 13 cores to analyze for sediment grain size, organic matter content, and trace element concentration of Cd, Cr, Cu, Ni, Pb, Zn. Results showed that trace element concentrations ranged from uncontaminated (Cd, Cu, and Zn) to very minor contaminated (Cr, Ni, and Pb). The concentrations were gradually influenced by suspended particle size and the mangrove plants.ReferencesAnh M.T., Chi D.H., Vinh N.N., Loan T.T., Triet L.M., Slootenb K.B.-V., Tarradellas J., 2003. Micropollutants in the sediment of Sai Gon – Dong Nai rivers: Situation and ecological risks. Chimia International Journal for Chemistry, 57, 09(0009–4293), 537–541.Baruddin N.A., Shazili N.A., Pradit S., 2017. Sequential extraction analysis of heavy metals in relation to bioaccumulation in mangroves, Rhizophora mucronata from Kelantan delta, Malaysia. AACL Bioflux, 10(2), 172-181. Retrieved from www.bioflux.com/aacl.Bravard J.-P., Goichot M., Tronchere H., 2014. An assessment of sediment transport processes in the lower Mekong river based on deposit grain size, the CM technique and flow energy data. Geomorphology, 207, 174-189.Cang L.T., Thanh N.C. 2008. Importing and exporting sediment to and from mangrove forest at Dong Trang estuary, Can Gio district, Ho Chi Minh city. Science & Technology Development, 11(04), 12-18.Carignan J., Hild P., Mevelle G., Morel J., Yeghicheyan D., 2001. Routine analyses of trace elements in geological samples using flow injection and low-pressure on-line liquid chromatography coupled to ICP-MS: A study of geochemical reference materials BR, DR-N, UB-N, AN-G and GH. The Journal of Geo standard and Geoanalysis, 187-198.Carlson P.R., Yarbro L.A., Zimmermann C.F., Montgomery J.R., 1983. Pore water chemistry of an overwash mangrove island. Academy Symposium: Future of the Indian River System, 46(3/4), 239-249. https://www.jstor.org/stable/24320336.Chatterjee M., Canário J., Sarkar S.K., Branco V., Godhantaraman N., Bhattacharya B.D., Bhattacharya A., 2012. Biogeochemistry of mercury and methylmercury in sediment cores from Sundarban mangrove wetland, India—a UNESCO World Heritage Site. Environ Monit Assess, 184, 5239–5254.Claudia R., Huy N.V., 2004. Water allocation policies for the Dong Nai river basin in Viet Nam: An integrated perspective. EPTD Discussion Paper, 127, 01-52.Folk R.L., Ward W.C., 1957. Brazos River bar: A study in the significance of grain size parameters. Journal of Sedimentary Petrology, 27(1), 3-26.Furukawaa K., Wolanski E., Mueller H., 1997. Currents and sediment transport in mangrove forests. Estuarine, Coastal and Shelf Science, 44, 301-310.Hai H.Q., Tuyen N.N., 2011. Coastal Erosion of Can Gio district Ho Chi Minh City due to the global climate change. The journal of development of technology and science, 14, 17-28.HCM SO S.O., 2015. Annual statistic data in 2015 for HCM city. Ho Chi Minh city: Statistic office of HCM city.HCMC, 2017. Decision No. 3901 on approving the areas of forest and land in HCM city in 2016. Ho Chi Minh: The people's committee of HCM city.Herut B., Sandler A., 2006. Normalization methods for pollutants in marine sediments: review and recommendations for the Mediterranean. Haifa 31080: Israel Oceanographic & Limnological Research: IOLR Report H18/2006.Hong P.N., San H.T., 1993. Mangroves of Vietnam: Chapter VI Human impacts on the mangrove ecosystem. Bangkok 10501: IUCN - The International Union for Conservation of Nature, ISBN: 2-8317-0166-x.Hubner R., Astin K.B., Herbert R.J., 2009. Comparison of sediment quality guidelines (SQGs) for the assessment of metal contamination in marine and estuarine environments. Journal of Environmental Monitoring, 11, 713–722.IAEA, 2003. Collection and preparation of bottom sediment samples for analysis of radionuclides and trace elements. Vienna, Austria: International Atomic Energy Agency, IAEA-TECDOC-1360, ISBN 92–0–109003–X.Jingchun L., Chongling Y., Ruifeng Z., Haoliang L., Guangqiu Q., 2008. Speciation changes of Cd in mangrove (Kandelia Candel L.) rhizosphere sediments. Bull Environ Contam Toxicol, 231-236. Doi:10.1007/s00128-007-9351-z.Kalaivanan R., Jayaprakash M., Nethaji S., Arya V., Giridharan L., 2017. Geochemistry of Core Sediments from Tropical Mangrove Region of Tamil Nadu: Implications on Trace Metals. Journal of Earth Science & Climatic Change, ISSN: 2157-7617., 8(1.1000385), 1-10. Doi:10.4172/2157-7617.1000385.Kathiresan K., Saravanakumar K., Mullai P., 2014. Bioaccumulation of trace elements by Avicennia marina. Journal of Coastal Life Medicine, 2(11), 888-894.Kitazawa T., Nakagawa T., Hashimoto T., Tateishi M., 2006. Stratigraphy and optically stimulated luminescence (OSL) dating of a Quaternary sequence along the Dong Nai River, southern Vietnam. Journal of Asian Earth Sciences, 27, 788–804.Lacerda L.D., 1998. Trace metals of biogeochemistry and diffuse pollution in mangrove (M. Vannucci, Ed.) Mangrove ecosystem occassional papers (ISSN: 0919-1348), 2, 1-72.Laura H., Probsta A., Probsta J.L., Ulrich E., 2003. Heavy metal distribution in some French forest soils: evidence for atmospheric contamination. The Science of Total Environment, 195-210.Li R., Li R., Chai M., Shen X., Xu H., Qiu G., 2015. Heavy metal contamination and ecological risk in Futian mangrove forest sediment in Shenzhen Bay, South China. Marine Pollution Bulletin, 101, 448–456.Long E., Morgan L.G., 1990. The potential for biological effects of sediment-sorted contaminants tested in the national status and trends program. Seattle, Washington: NOAA Technical Memorandum NOS OMA 52.Long E.R., Field L.J., MacDonald D.D., 1998. Predicting toxicity in marine sediments with numerical sediment quality guidelines. Environmental Toxicology and Chemistry, 17, 714–727. http://onlinelibrary.wiley.com/doi/10.1002/etc.5620170428/abstract;jsessionid=C5264A1AD0.7ACCA9B4EF9A088BE2EDE9.f04t04Long E.R., MacDonald D.D., Smith S.L., Calder F.D., 1995. Incidence of adverse biological effects within ranges of chemical concentration in marine and estuarine sediments. Environmental management, 19, 81-97.Maiti S.K., Chowdhury A., 2013. Effects of Anthropogenic Pollution on Mangrove Biodiversity: A Review. Journal of Environmental Protection, 4, 1428-1434.Marchand C., Allenbach M., Lallier-Verges E., 2011. Relation between heavy metal distribution and organic matter cycling in mangrove sediments (Conception Bay, New Caledonia). Geoderma, Elsevier, 160 (3-4), 444-456.Mohd F.N., Nor R.H., 2010. Heavy metal concentrations in an important mangrove species, Sonneratia caseolaris, in Peninsular Malaysia. Environment Asia, 3, 50-53.Muller G., 1979. Schwermetalle in den Sedimenten des Rheins - Veränderungen seit 1971. Umschau, 778-783.Nam V.N., 2007. Restoration of Can Gio mangrove forest: Its structure and function in comparison between the ecosytems of plantion and nature mangrove forest. Workshop on the thesis between Germany and Vietnam.Nickerson N.H., Thibodeau F.R., 1985. Association between pore water sulfide concentrations and the distribution of mangroves. Biogeochemistry, 1, 183-192.Ong Che R.G., 1999. Concentration of 7 Heavy Metals in Sediments and Mangrove Root Samples from Mai Po, Hong Kong. Marine Pollution Bulletin, 39, 269-279.Passega R., 1957. Texture as characteristics of clastic deposition. Publisher: American Association of Petroleum Geologists.Passega R., 1964. Grain size representation by CM patterns as a geological tool. J Sediment Petrol, 34, 830–847.Phuoc V.L., An D.T., Cang L.T., Chung B.N., Tien N.V., 2010. Study the sediment dynamics in Can Gio mangrove forest (Nang Hai site, Ho Chi Minh city). Ho Chi Minh city: The final report of National University Ho Chi Minh city, No. B2009-18-36.Pumijumnong N., Danpradit S., 2016. Heavy metal accumulation in sediments and mangrove forest stems from Surat Thani province, Thailand. The Malaysian forester, 79(1&2), 212-228.QCVN43:2012/BTNMT, 2012. QCVN43:2012/BTNMT: National technical regulation on the sediment quality, Ha Noi: Ministry of natural resources and environment of Vietnam.Qiao S., Shi X., Fang X., Liu S., Kornkanitnan N., Gao J., Yu Y., 2015. Heavy metal and clay mineral analyses in the sediments of Upper Gulf of Thailand and their implications on sedimentary provenance and dispersion pattern. Journal of Asian Earth Sciences, 114, 488–496.Rollinson H. R., 1993. Using geochemical data for evaluation, presentation and interpretation. UK: Longman Group UK Limited ISBN-0-582-06701-4.Spalding M., Blasco F., Field C., 2010. World atlas of mangrove. Cambridge: Earthscan in UK and US, ISBN: 978-1-84407-657-4.Strady E., Dang V.B., Némery J., Guédron S., Dinh Q.T., Denis H., Nguyen P.D., 2016. Baseline seasonal investigation of nutrients and trace metals in surface waters and sediments along the Saigon River basin impacted by the megacity of HCM, Viet Nam. Environ Sci Pollut Res, 1-18. doi:10.1007/s11356-016-7660-7.Tam N.F., Wong Y.S., 1996. Retention and distribution of heavy metals in mangrove soils receiving wastewater. Environment pollution, 94(5), 283-291.Thomas N., Lucas R., Bunting P., Hardy A., Rosenqvist A., Simard M., 2017. Distribution and drivers of global mangrove forest change, 1996– 2010. PLoS ONE, 12(6): e0179302, 1-14. Doi:10.1371/journal.pone.0179302.Thuy H.T., Loan T.T., Vy N.N., 2007. Study on environmental geochemistry of heavy metals in urban canal sediments of Ho Chi Minh city. Science and Technology Development, 10(01), 1-9.Toan T.T., Bay N.T., 2006. A study on the tendency of accretion and erosion in Can Gio coastal zone. Vietnam-Japan estuary workshop, 184-194.Tri N.H., Hong P.N., Cuc L.T., 2000. Can Gio Mangrove Biosphere Reserve Ho Chi Minh city, Ha Noi, Viet Nam. Ha Noi: Hanoi University Publisher.Truong T.V., 2007. Planning for water source of Dong Nai river basin. Retrieved from Water Resources Planning: http://siwrp.org.vn/tin-tuc/quy-hoach-tai-nguyen-nuoc-luu-vuc-song-dong-nai_143.html.Tuan L.D., Oanh T.T., Thanh C.V., Quy N.D., 2002. Can Gio mangrove biosphere reserve. HCM city, Vietnam: Agriculture Publisher.Tue N.T., Quy T.D., Amono A., 2012. Historical profiles of trace element concentrations in Mangrove sediments from the Ba Lat estuary, Red river, Vietnam. Water, Air & Soil Pollution, ISSN 0049-6979, 223(3), 1315-1330.Twilley R., Chen R., Hargis T., 1992. Carbon sinks in mangroves and their implications to carbon budget of tropical coastal ecosystems. Water, Air & Soil pollution, Netherland, 64, 265-288.UN Environment Program, 2006. Methods for sediment sampling and analysis. Palermo (Sicily), Italy: United Nation Environment Program.UNESCO, 2000. List of Biosphere reserves approved by MAB committee belonging to UNESCO. Retrieved from United Nations, Educational, Scientific, Cultural Organization (UNESCO): http://www.unesco.org/new/en/natural-sciences/environment/ecological-sciences/biosphere-reserves/asia-and-the-pacific.Vandenberghe N., 1975. An evaluation of CM patterns for grain size studies of fine grained sediments. Sedimentology, 22, 615-622.Vinh B.T., Ichiro D., 2012. Erosion mechanism of cohesive river bank and bed of Soai Rap river (Ho Chi Minh city). J. Sci. of the Earth, 34(2), 153-161.Wang J., Du H., Xu Y., Chen K., Liang J., Ke H., Cai M., 2016. Environmental and Ecological Risk Assessment of Trace Metal Contamination in Mangrove Ecosystems. BioMed Research International, Article ID 2167053, 1-14. Doi:10.1155/2016/2167053.Wedepohl K.H., 1995. The composition of the continental crust. Geochimica et Cosmochimica Acta, 59(7), 1217-1232.Woodroffe C., Rogers K., McKee K., Lovelock C., Mendelssohn I., Saintilan N., 2016. Mangrove sedimentation and response to relative sea level rise. The Annual Review of Marine Science, 8, 243-266.Zhang J., Liu C.L., 2002. Riverine Composition and Estuarine Geochemistry of Particulate Metals in China-Weathering Features, Anthropogenic Impact and Chemical Fluxes. Estuarine, Coastal and Shelf Science, 54(6), 1051-1070.Zhang W., Feng H., Chang J., Qu J., Xie H., Yu L., 2009. Heavy metal contamination in surface sediments of Yangtze River intertidal zone: An assessment from different indexes. Environmental Pollution, 157, 1533-1543.Zheng W.-j., Xiao-yong C., Peng L., 1997. Accumulation and biological cycling of heavy metal elements in Rhizophora stylosa mangroves in Yingluo Bay, China. Marine ecology progress series, 159, 293-301.

Rong Cave is one of the more important caves in northern Vietnam’s Dong Van Karst Plateau Geopark (part of the Global Geoparks Network), because its subterranean lake provides agricultural and domestic water for neighboring communities. Maintenance and utilization of Rong Cave’s water reservoir, as well as touristic cave use, require frequent human access to Rong Cave. Depending on the availability of seasonal drip water and the water level of the lake, the abundant clay-rich sediment in the back portion of Rong Cave and possible seepage of gas from deeper strata along geologic faults provide seasonally elevated concentrations of radon in cave air. Based on repeated measurements over 10 months in 2015 and 2016 of the concentrations of radon isotopes (222Rn and 220Rn, also called thoron) with a portable SARAD® RTM 2200 instrument (SARAD® GmbH, Germany), the human total annual inhalation dose was estimated according to the UNSCEAR (2000) algorithm. The result indicates that the radon-related radiation exposure is insignificant for short-term visitors but may reach ~1.8 mSv a-1 for tour guides and ~25 mSv a-1 for cave utility workers. The latter values exceed the IAEA-recommended safety threshold of 1 mSv a-1 (IAEA, 1996). We recommend radiation monitoring for cave utility workers and tour guides. Prolonged human presence in Rong Cave should be avoided during periods of seasonally elevated radon concentrations.References Cigna A.A., 2005. Radon in caves. Interna-tional Journal of Speleology 34(1-2), 1-18. Ha Giang Statistics Office (GSO), 2016. Statistical Yearbook of Ha Giang 2015, 404 pages, Ha Giang (in Vietnamese). Dumitru O.A., Onac B.P., Fornós J.J., Cosma C., Ginés A., Ginés J., Merino A., 2015. Radon survey in caves from Mallorca Island, Spain. Science of The Total Environment, 526, 196-203. Etiope G., Martinelli G., 2002. Migration of carrier and trace gases in the geosphere: An overview. Physics of the Earth and Planetary Interiors, 129(3-4), 185-204. Global Geoparks Network (GGN), 2010. Dong Van Karst Plateau Geopark. http://www.globalgeopark.org/aboutggn/list/vietnam/6509.htm Gregorič A., Vaupotič J., Šebela S., 2013. The role of cave ventilation in governing cave air temperature and radon levels (Postojna Cave, Slovenia). International Journal of Climatology 34, 1488-1500. Gunn J., 2003. Radon in caves. In Gunn J (Ed.): Encyclopedia of Caves and Karst Science. Fitzroy Dearborn (Taylor & Francis Books, Inc.), London, UK, 617-619. International Atomic Energy Agency (IAEA), 1996. Quality assurance for safety in nuclear power plants and other nuclear installations. Safety standards and guides, In: Safety series Q1-Q14. A publication within the Nuss programme. International Commission on Radiological Protection (ICRP), 2003. Database of Dose Coefficients: Workers and Members of the Public, Version 2.0.1 (CD- ROM), Elsevier Science, Amsterdam. International Commission on Radiological Protection (ICRP), 2010. Lung cancer risk from radon and progeny and Statement of radon. ICPR Pub. 115. Ann. ICPR 40(1). Markkanen M., Arvela H., 1992. Radon emanation from soils. Radiation Protection Dosimetry, 45(1-4), 269-272. Meisenberg O., Mishra R., Joshi M., Gierl S., Rout R., Guo L., Agaarwwal T., Kanse S., Irlinger J., Sapra B.K., Tschiersch J., 2017. Radon and thoron inhalation doses in dwellings with earthen architecture: Comparison of measurement methods. Science of The Total Environment, 579, 1855-1862. Morawska L., Phillips C.R., 1993. Depend-ence of the radon emanation coefficient on radium distribution and internal structure of the material, Geochimica et Cosmochimica Acta, 57(8), 1783-1797. Nguyen Thuy Duong, Nguyen Van Huong, Arndt Schimmelmann, Nguyen Thi Anh Nguyet, Dang Thi Phuong Thao, Ta Hoa Phuong, 2016. Radon concentrations in karst caves in Dong Van karst plat-eau. VNU Journal of Science - Earth and Environmental Sciences, 32(2S), 187-197 (in Vietnamese). Nguyen Thuy Duong, Arndt Schimmelmann, Nguyen Van Huong, Agnieszka Drobniak, Jay T. Lennon, Ta Hoa Phuong, Nguyen Thi Anh Nguyet, 2017. Subterranean microbial oxidation of atmospheric methane in cavernous tropical karst. Chemical Ge-ology, 466, 229-238. Nguyen Van Huong, Nguyen Thuy Duong, Nguyen Thi Anh Nguyet, Pham Nu Quynh Nhi, Dang Thi Phuong Thao, Tran Van Phong, Nguyen Ngoc Anh, 2016. Cenozoic tectonics in Dong Van karst plateau recorded in karst cave system. VNU Journal of Science - Earth and Environmental Sciences, 32(2S), 45-58 (in Vietnamese). Nguyen Anh Nguyet, Nguyen Thuy Dương, Arndt Schimmelmann, Nguyen Van Hu-ong, Ta Hoa Phuong, Dang Phuong Thao, Ma Ngoc Giang, 2016. Radon concentration in Rong cave in Dong Van Karst Plateau Geopark. Proceeding of International Symposium Hanoi Geoengineering 2016, 248-253. The United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR), 1993. Report to the General Assembly, with scientific annexes. United Nations sales publication E.94.IX.2. United Nations, New York. The United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR), 2000. UNSCEAR 2000 Report. In: Sources, vol. I. United Nations, New York. The United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR), 2008. UNSCEAR 2000 Report. In: Sources, vol. I. United Nations, New York. Vietnamese Standards (TCVN 7889:2008), 2008. Natural Radon activity in buildings-Levels and general requirements of measuring methods, Ministry of Science and Technology and Ministry of Construction (Viet Nam) (in Vietnamese). Tong-Dzuy Thanh, Vu Khuc (Eds), 2011. Stratigraphic units of Vietnam. Vietnam National University Publisher, 553p. Walia V., Lin S.J., Fu C.C., Yang T.F., Hong W.L., Wen K.L., Chen C.H., 2010. Soil-gas monitoring: A tool for fault delineation studies along Hsinhua Fault (Tainan), Southern Taiwan. Applied Geochemistry, 25(4), 602-607. Wang J., Meisenberg O., Chen Y., Karg E., Tschiersch J., 2011. Mitigation of radon and thoron decay products by filtration. Science of The Total Environment, 409(19), 3613-3619. World Health Organization (WHO), 2000. Air Quality Guidelines for Europe, (2nd edition). WHO Regional Publications, European Series, 91, Chapter 8.3 - Radon.

This paper presents some results of rainfall forecast in the monsoon onset period in South Vietnam, with the use of ensemble Kalman filter to assimilate observation data into the initial field of the model. The study of rainfall forecasts are experimented at the time of Southern monsoon outbreaks for 3 years (2005, 2008 and 2009), corresponding to 18 cases. In each case, there are five trials, including satellite wind data assimilation, upper-air sounding data assimilation, mixed data (satellite wind+upper-air sounding data) assimilation and two controlled trials (one single predictive test and one multi-physical ensemble prediction), which is equivalent to 85 forecasts for one trial. Based on the statistical evaluation of 36 samples (18 meteorological stations and 18 trials), the results show that Kalman filter assimilates satellite wind data to forecast well rainfall at 48 hours and 72 hours ranges. With 24 hour forecasting period, upper-air sounding data assimilation and mixed data assimilation experiments predicted better rainfall than non-assimilation tests. The results of the assessment based on the phase prediction indicators also show that the ensemble Kalman filter assimilating satellite wind data and mixed data sets improve the rain forecasting capability of the model at 48 hours and 72 hour ranges, while the upper-air sounding data assimilation test produces satisfactory results at the 72 hour forecast range, and the multi-physical ensemble test predicted good rainfall at 24 hour and 48 hour forecasts. The results of this research initially lead to a new research approach, Kalman Filter Application that assimilates the existing observation data into input data of the model that can improve the quality of rainfall forecast in Southern Vietnam and overall country in general.References Bui Minh Tuan, Nguyen Minh Truong, 2013. Determining the onset indexes for the summer monsoon over southern Vietnam using numerical model with reanalysis data. VNU Journal of Science, 29(1S), 187-195.Charney J.G., 1955. The use of the primitive equations of motion in numerical prediction, Tellus, 7, 22.Cong Thanh, Tran Tan Tien, Nguyen Tien Toan, 2015. Assessing prediction of rainfall over Quang Ngai area of Vietnam from 1 to 2 day terms. VNU Journal of Science, 31(3S), 231-237.Courtier P., Talagrand O., 1987. Variational assimilation of meteorological observations with the adjoint vorticity equations, Part II, Numerical results. Quart. J. Roy. Meteor. Soc., 113, 1329.Daley R., 1991. Atmospheric data analysis. Cambridge University Press, Cambridge.Elementi M., Marsigli C., Paccagnella T., 2005. High resolution forecast of heavy precipitation with Lokal Modell: analysis of two case studies in the Alpine area. Natural Hazards and Earth System Sciences, 5, 593-602.Fasullo J. and Webster P.J., 2003. A hydrological definition of India monsoon onset and withdrawal. J. Climate, 16, 3200-3211.Haltiner G.J., Williams R.T., 1982. Numerical prediction and dynamic meteorology, John Wiley and Sons, New York.Hamill T.M., Whitaker J.S., Snyder C., 2001. Distance-dependent filtering of background error covariance estimates in an ensemble Kalman filter. Mon. Wea. Rev., 129, 2776.He J., Yu J., Shen X., and Gao H., 2004. Research on mechanism and variability of East Asia monsoon. J. Trop. Meteo, 20(5), 449-459.Hoang Duc Cuong, 2008. Experimental study on heavy rain forecast in Vietnam using MM5 model. A report on the Ministerial-level research projects on science and technology, 105p.Houtekamer P.L., Mitchell H.L., Pellerin G., Buehner M., Charron M., Spacek L., Hansen B., 2005. Atmospheric data assimilation with an ensemble Kalman filter: Results with real observations. Mon. Wea. Rev., 133, 604.Houtekamer P.L., Mitchell H.L., 2005. Ensemble Kalman filtering, Quart. J. Roy. Meteor. Soc., 131C, 3269-3289.Hunt B.R., Kostelich E., Szunyogh I., 2007. Efficient data assimilation for spatiotemporal chaos: a local ensemble transform Kalman filter. Physica D., 230, 112-126.Kalnay E., 2003. Atmospheric modeling, data assimilation and predictability. Cambridge University Press, 181.Kalnay et al., 2008. A local ensemble transform Kalman filter data assimilation system for the NCEP global model. Tellus A, 60(1), 113-130.Kato T., Aranami K., 2009. Formation Factors of 2004 Niigata-Fukushima and Fukui Heavy Rainfalls and Problems in the Predictions using a Cloud-Resolving Model. SOLA. 10, doi:10.2151/sola.Kieu C.Q., 2010. Estimation of Model Error in the Kalman Filter by Perturbed Forcing. VNU Journal of Science, Natural Sciences and Technology, 26(3S), 310-316.Kieu C.Q., 2011. Overview of the Ensemble Kalman Filter and Its Application to the Weather Research and Forecasting (WRF) model. VNU Journal of Science, Natural Sciences and Technology, 27(1S), 17-28.Kieu C.Q., Truong N.M., Mai H.T., and Ngo Duc T., 2012. Sensitivity of the Track and Intensity Forecasts of Typhoon Megi (2010) to Satellite-Derived Atmosphere Motion Vectors with the Ensenble Kalman filter. J. Atmos. Oceanic Technol., 29, 1794-1810.Kieu Thi Xin, 2005. Study on large-scale rainfall forecast by modern technology for flood prevention in Vietnam. State-level independent scientific and technological briefing report, 121-151.Kieu Thi Xin, Vu Thanh Hang, Le Duc, Nguyen Manh Linh, 2013. Climate simulation in Vietnam using regional climate nonhydrostatic NHRCM and hydrostatic RegCM models. Vietnam National University, Hanoi. Journal of Natural sciences and technology, 29(2S), 243-25.Krishnamurti T.N., Bounoa L., 1996. An introduction to numerical weather prediction techniques. CRC Press, Boca Raton, FA.Lau K.M., Yang S., 1997. Climatology and interannual variability of the Southeast Asian summer monsoon. Adv. Atmos. Sci., 14,141-162.Li C., Qu X., 1999. Characteristics of Atmospheric Circulation Associated with Summer monsoon onset in the South China Sea. Onset and Evolution of the South China Sea Monsoon and Its Interaction with the Ocean. Ding Yihui, and Li Chongyin, Eds, Chinese Meteorological Press, Beijing, 200-209.Lin N., Smith J.A., Villarini G., Marchok T.P., Baeck M.L., 2010. Modeling Extreme Rainfall, Winds,and Surge from Hurricane Isabel, 25. Doi: 10.1175/2010WAF2222349.Lu J., Zhang Q., Tao S., and Ju J., 2006. The onset and advance of the Asian summer monsoon. Chinese Science Bulletin, 51(1), 80-88.Matsumoto J., 1997. Seasonal transition of summer rainy season over Indochina and adjacent monsoon region. Adv. Atmos. Sci., 14, 231-245.Miyoshi T., and Kunii M., 2012. The Local Ensenble Transform Kalman Filter with the Weather Rearch and Forecasting Model: Experiments with Real Observation. Pure Appl. Geophysic, 169(3), 321-333. Miyoshi T., Yamane S., 2007. Local ensemble transform Kalman filtering with an AGCM at a T159/L48 resolution. Mon. Wea. Rev., 135, 3841-3861.Nguyen Khanh Van, Tong Phuc Tuan, Vuong Van Vu, Nguyen Manh Ha, 2013. The heavy rain differences based on topo-geographical analyse at Coastal Central Region, from Thanh Hoa to Khanh Hoa. J. Sciences of the Earth, 35, 301-309.Nguyen Minh Truong, Bui Minh Tuan, 2013. A case study on summer monsoon onset prediction for southern Vietnam in 2012 using the RAMS model. VNU Journal of Science, 29(1S), 179-186.Phillips N.A., 1960b. Numerical weather prediction. Adv. Computers, 1, 43-91, Kalnay 2004.Phillips N., 1960a. On the problem of the initial data for the primitive equations, Tellus, 12, 121126.Phuong Nguyen Duc, 2013. Experiment on combinatorial Kalman filtering method for WRF model to forecast heavy rain in central region in Vietnam. The Third International MAHASRI/HyARC Workshop on Asian Monsoon and Water Cycle, 28-30 August 2013, Da Nang, Viet Nam, 217-224.Richardson L.F., 1922. Weather prediction by numerical process. Cambridge University Press, Cambridge. Reprinted by Dover (1965, New York).Routray, Mohanty U.C., Niyogi D., Rizvi S.R., Osuri K.K., 2008. First application of 3DVAR-WRF data assimilation for mesoscale simulation of heavy rainfall events over Indian Monsoon region. Journal of the Royal Meteorological Society, 1555.Schumacher, R. S., C. A. Davis, 2010. Ensemble-based Forecast Uncertainty Analysis of Diverse Heavy Rainfall Events, 25. Doi: 10.1175/2010WAF2222378.Snyder C., Zhang F., 2003. Assimilation of simulated Doppler radar observations with an Ensemble Kalman filter. Mon. Wea. Rev., 131, 1663.Szunyogh I., Kostelich E.J., Gyarmati G., Kalnay E., Hunt B.R., Ott E., Satterfield E., Yorke J.A., 2008. A local ensemble transform Kalman filter data assimilation system for the NCEP global model. Tellus A., 60, 113-130.Tanaka M., 1992. Intraseasonal oscillation and the onset and retreat dates of the summer monsoon east, southeast Asia and the western Pacific region using GMS high cloud amount data. J. Meteorol. Soc. Japan, 70, 613-628.Tan Tien Tran, Nguyen Thi Thanh, 2011. The MODIS satellite data assimilation in the WRF model to forecast rainfall in the central region. VNU Journal of Science, Natural Sciences and Technology, 27(3S), 90-95.Tao S., Chen L., 1987. A review of recent research on East summer monsoon in China, Monsoon Meteorology. C. P. Changand T. N. Krishramurti, Eds, Oxford University Press, Oxford, 60-92.Tippett M.K., Anderson J.L., Bishop C.H., Hamill T.M., Whitaker J.S., 2003. Ensemble square root filters. Mon. Wea. Rev., 131, 1485.Thuy Kieu Thi, Giam Nguyen Minh, Dung Dang Van, 2013. Using WRF model to forecast heavy rainfall events on September 2012 in Dong Nai River Basin. The Third International MAHASRI/HyARC Workshop on Asian Monsoon and Water Cycle, 28-30 August 2013, Da Nang, Viet Nam, 185-200.Xavier, Chandrasekar, Singh R. and Simon B., 2006. The impact of assimilation of MODIS data for the prediction of a tropical low-pressure system over India using a mesoscale model. International Journal of Remote Sensing 27(20), 4655-4676. https://doi.org/10.1080/01431160500207302. Wang B., 2003. Atmosphere-warm ocean interaction and its impacts on Asian-Australian monsoon variation. J. Climate, 16(8), 1195-1211.Wang B. and Wu R., 1997. Peculiar temporal structure of the South China Sea summer monsoon. J. Climate., 15, 386-396.Wang L., He J., and Guan Z., 2004. Characteristic of convective activities over Asian Australian ”landbridge” areas and its possible factors. Act a Meteorologic a Sinica, 18, 441-454.Wang, B., and Z. Fan, 1999. Choice of South Asian Summer Monsoon Indices. Bull. Amer. Meteor. Sci., 80, 629-638.Webster P.J., Magana V.O., Palmer T.N., Shukla J., Tomas R.A., Yanai M., Yasunari T., 1998. Monsoons: Processes, predictability, and teprospects for prediction, J. Geophys. Res., 103, 14451-14510.Wilks Daniel S., 1997. Statistical Methods in the Atmospheric Sciences. Ithaca New York., 59, 255.Whitaker J.S., Hamill T.M., 2002. Ensemble data assimilation without perturbed observations. Mon. Wea. Rev., 130, 1913.Wu G., Zhang Y., 1998. Tibetan plateau forcing and the timing of the monsoon onset over South Asia and the South China Sea. Mon.Wea.Rev., 126, 913-927.Zhang Z., Chan J.C.L., and Ding Y., 2004. Characteristics, evolution and mechanisms of the summer monsoon onset over Southeast Asia. J.Climatology, 24, 1461-1482.http://weather.uwyo.edu/upperair/sounding.html and http://tropic.ssec.wisc.edu/archive/

Study of petrological and geochemical characteristics of mantle peridotite xenoliths in Pliocene alkaline basalt in Nghia Dan (West Nghe An) was carried out. Rock-forming clinopyroxenes, the major trace element containers, were separated from the xenoliths to analyze for major, trace element and Sr-Nd isotopic compositions. The data were interpreted for source geochemical characteristics and geodynamic processes of the lithospheric mantle beneath the region. The peridotite xenoliths being mostly spinel-lherzolites in composition, are residual entities having been produced following partial melting events of ultramafic rocks in the asthenosphere. They are depleted in trace element abundance and Sr-Nd isotopic composition. Some are even more depleted as compared to mid-ocean ridge mantle xenoliths. Modelled calculation based on trace element abundances and their corresponding solid/liquid distribution coefficients showed that the Nghia Dan mantle xenoliths may be produced of melting degrees from 8 to 12%. Applying various methods for two-pyroxene temperature- pressure estimates, the Nghia Dan mantle xenoliths show ranges of crystallization temperature and pressure, respectively, of 1010-1044°C and 13-14.2 kbar, roughly about 43km. A geotherm constructed for the mantle xenoliths showed a higher geothermal gradient as compared to that of in the western Highlands (Vietnam) and a conductive model, implying a thermal perturbation under the region. The calculated Sm-Nd model ages for the clinopyroxenes yielded 127 and 122 Ma. If the age is meaningful it suggests that there was a major geodynamic process occurred beneath Western Nghe An in the middle- Early Cretaceous that was large enough to cause perturbation in the evolutional trend of the Sm-Nd isotopic system.ReferencesAn A-R., Choi S.H., Yu Y-g., Lee D-C., 2017. Petrogenesis of Late Cenozoic basaltic rocks from southern Vietnam. Lithos, 272-273 (2017), 192-204.Anders E., Grevesse N., 1989. Abundances of the elements: meteorite and solar. Geochimica et Cosmochimica Acta, 53, 197-214.Anderson D.L, 1994. The subcontinental mantle as the source of continental flood basalts; the case against the continental lithosphere mantle and plume hear reservoirs. Earth and Planetary Science Letter, 123, 269-280.Arai S., 1994. Characterization of spinel peridotites by olivine-spinel compositional relationships: review and interpretation. Chemical Geology, 113, 191-204.Ballhaus C., Berry R.G., Green D.H., 1991. High pressure experimental calibration of the olivine orthopyroxene-spinel oxygen geobarometer: implications for the oxidation state of the upper mantle. Contributions to Mineralogy and Petrology, 107, 27-40.Barr S.M. and MacDonald A.S., 1981. Geochemistry and geochronology of late Cenozoic basalts of southeast Asia: summary. Geological Society of America Bulletin, 92, 508-512.Brey G.P., Köhler T., 1990. Geothermobarometry in four-phase lherzolite II. New thermobarometers, and practical assessment of existing thermobarometers. Journal of Petrology, 31, 1353-1378.Briais A., Patriat P., Tapponnier P., 1993. Updated interpretation of magnetic anomalies and seafloor spreading stages in the South China Sea, implications for the Tertiary tectonics of SE Asia. Journal of Geophysical Research, 98, 6299-6328.Carlson R.W., Irving A.J., 1994. Depletion and enrichment history of subcontinental lithospheric mantle: an Os, Sr, Nd and Pb isotopic study of ultramafic xenoliths from the northwestern Wyoming Craton. Earth and Planetary Science Letters, 126, 457-472.Carlson R.W., Lugmair G.W., 1979. Sm-Nd constraints on early lunar differentiation and the evolution of KREEP. Earth and Planetary Science Letters, 45, 123-132.Carlson R.W., Lugmair G.W., 1981. Sm-Nd age of lherzolite 67667: implications for the processes involved in lunar crustal formation. Earth and Planetary Science Letters, 56, 1-8.Choi H.S., Mukasa S.B., Zhou X-H., Xian X-G.H., Andronikov A.V., 2008. Mantle dynamics beneath East Asia constrained by Sr, Nd, Pb and Hf isotopic systematics of ultramafic xenoliths and their host basalts from Hannuoba, North China. Chemical Geology, 248, 40-61.Choi S.H., Jwa Y.-J., Lee H.Y., 2001. Geothermal gradient of the upper mantle beneath Jeju Island, Korea: evidence from mantle xenoliths. Island Arc, 10, 175-193.Choi S.H., Kwon S-T., Mukasa S.B., Sagon H., 2005. Sr-Nd-Pb isotope and trace element systematics of mantle xenoliths from Late Cenozoic alkaline lavas, South Korea. Chemical Geology, 22, 40-64.Cox K.G., Bell J.D., Pankhurst R.J., 1979. The Interpretation of Igneous Rocks. George Allen & Unwin.Cung Thuong Chi, Dorobek S.L., Richter C., Flower M., Kikawa E., Nguyen Y.T., McCabe R., 1998. Paleomagnetism of Late Neogene basalts in Vietnam and Thailand: Implications for the Post-Miocene tectonic history of Indochina. In: Flower M.F.J., Chung, S.L., Lo, C.H., (Eds.). Mantle Dynamics and Plate Interactions in East Asia. Geodynamics Ser, American Geophysical Union, 27, 289-299.De Hoog J.C.M., Gall L., Cornell D.H., 2010. Trace-element geochemistry of mantle olivine and application to mantle petrogenesis and geothermobarometry. Chemical Geology, 270, 196-215.DePaolo D. J., 1981. Neodymium isotopes in the Colorado Front Range and crust - mantle evolution in the Proterozoic. Nature, 291, 193-197.DePaolo D.J., Wasserburg G.J., 1976. Nd isotopic variations and petrogenetic models. Geophysical Research Letters, 3(5), 249-252. Doi: https://doi.org/10.2113/gselements.13.1.11.Embey-Isztin A., Dobosi G., Meyer H.-P., 2001. Thermal evolution of the lithosphere beneath the western Pannonian Basin: evidence from deep-seat xenoliths. Tectonophysics, 331, 285-306.Fedorov P.I., Koloskov A.V., 2005. Cenozoic volcanism of Southeast Asia. Petrologiya, 13(4), 289-420.Frey F.A., Prinz M., 1978. Ultramafic inclusions from San Carlos, Arizona: Petrologic and geochemical data bearing on their Petrogenesis. Earth and Planetary Science Letters, 38, 129-176.Garnier V., Ohmenstetter D., Giuliani G., Fallick A.E., Phan T.T., Hoang Q.V., Pham V.L., Schawarz D., 2005. Basalt petrology, zircon ages and sapphire genesis from Dak Nong, southern Vietnam. Mineralogical Magazine, 69(1), 21-38.Gast P.W., 1968. Trace element fractionation and the origin of tholeiitic and alkaline magma types. Geochimica et Cosmochimica Acta, 32, 1057-1086.Gorshkov A.P, Ivanenko A.N., Rashidov V.A., 1984. Hydro-magnetic investigations of submarine volcanic zones in the marginal seas of Pacific Ocean (Novovineisky and Bien Dong seas). Pacific Ocean Geology, 1, 13-20.Gorshkov A.P., 1981. Investigation of submarine volcanoes during the 10th course of scientific research vessel ‘Volcanolog’. Volcanology and Seismology, 6, 39-45 (in Russian).Hart S.R., 1988. Heterogeneous mantle domains: signatures, genesis and mixing chronologies. Earth and Planetary Science Letters, 90, 273-296.Hirose K., Kushiro I., 1993. Partial melting of dry peridotites at high pressures: determination of composition of melts segregated from peridotite using aggregate of diamond. Earth Planet Science Letters, 114, 477-489.Hoang-Thi H.A., Choi S.H., Yongjae Yu Y-g., Pham T.H., Nguyen K.H., Ryu J-S., 2018. Geochemical constraints on the spatial distribution of recycled oceanic crust in the mantle source of late Cenozoic basalts, Vietnam. Lithos, 296-299 (2018), 382-395.Izokh A.E., Smirnov S.Z., Egorova V.V., Tran T.A., Kovyazin S.V., Ngo T.P., Kalinina V.V., 2010. The conditions of formation of sapphire and zircon in the areas of alkali-basaltoid volcanism in Central Vietnam. Russian Geology and Geophysics, 51(7), 719-733.Johnson K.T., Dick H.J.B. and Shimizu N., 1990. Melting in the oceanic upper mantle: An ion microprobe study of diopsides in abyssal peridotites. Journal of Geophysical Research (solid earth), 95, 2661-2678.Kölher T.P., Brey G.P., 1990. Calcium exchange between olivine and clinopyroxene calibrated as a geothermobarometer for natural peridotites from 2 to 60 kb with applications. Geochimica et Cosmochimica Acta, 54(9), 2375-2388.Kushiro I., 1996. Partial melting of a fertile mantle peridotite at high pressure: An experimental study using aggregates of diamond. In: A. Basu and S.R. Hart (Eds.), Earth Processes: Reading the Isotopic Code. AGU Monograph, 95, 109-122.Kushiro I., 1998. Compositions of partial melts formed in mantle peridotites at high pressures and their relation to those of primitive MORB. Physics of Earth and Planetary Interiors, 107, 103-110.Latin D., White N., 1990. Generating melt during lithospheric extension: Pure shear vs. simple shear. Geology, 18, 327-331.Lee T.-y. and Lawver L., 1995. Cenozoic plate reconstruction of Southeast Asia. In: M.F.J. Flower, R.J. McCabe and T.W.C. Hilde (Editors), Southeast Asia Structure, Tectonics, and Magmatism. Tectonophysics, 85-138.Li C-F., et al., 2015. Seismic stratigraphy of the central South China Sea basin and implications for neotectonics. Journal of Geophysical Research (solid earth), 120, 1377-1399. Doi:10.1002/2014JB011686.Li C.-F., et al., 2014. Ages and magnetic structures of the South China Sea constrained by deep tow magnetic surveys and IODP Expedition 349 Geochemistry, Geophysics, Geosystems, 14, 4958-4983.Malinovsky A.I., Rashidov V.A., 2015. Compositional characteristics of sedimentary and volcano-sedimentary rocks of Phu Quy-Catwick island group in the continental shelf of Vietnam. Bulletin of Kamchatka Regional Association of ‘Educational - Scientific’ Center, Earth Sciences, 27(3), 12-34 (in Russian with English summary).McCulloch M.T., Wasserburg G.J., 1978. Sm-Nd and Rb-Sr chronology of continental crust formation. Science, 200(4345), 1003-1011.Menzies M.A., Arculus R.L., Best M.G., et al., 1987. A record of subduction process and within-plate volcanism in lithospheric xenoliths of the southwestern USA. In P.H. Nixon (Editor), Mantle Xenoliths, John Wiley & Sons, Chichester, 59-74.Nguyen Hoang, Ogasawara M., Tran Thi Huong, Phan Van Hung, Nguyen Thi Thu, Cu Sy Thang, Pham Thanh Dang, Pham Tich Xuan, 2014. Geochemistry of Neogene Basalts in the Nghia Dan district, western Nghe An. J. Sci. of the Earth, 36, 403 -412.Nguyen Kinh Quoc, Nguyen Thu Giao, 1980. Cenozoic volcanic activity in Viet Nam. Geology and Mineral Resources, 2, 137-151 (in Vietnamese with English abstract).Nixon P.H., 1987 (Editor). Mantle xenoliths. John Wiley and Sons, 844p.Norman M.D. and Garcia M.O., 1999. Primitive magmas and source characteristics of the Hawaiian plume: petrology and geochemistry of shield picrites. Earth and Planetary Science Letters, 168, 27-44.Pollack H.N., Chapman D.S., 1977. On the regional variation of heat flow, geotherms and lithospheric thickness. Tectonophysics, 38, 279-296.Putirka K., 2008. Thermometers and Barometers for Volcanic Systems. In: Putirka, K., Tepley, F. (Eds.), Minerals, Inclusions and Volcanic Processes, Reviews in Mineralogy and Geochemistry, Mineralogical Soc. Am., 69, 61-120. Putirka K.D., 2017. Down the craters: where magmas stored and why they erupt. Methods and Further Reading. Supplement to February 2017 issue of Elements, 3(1), 11-16.Putirka K.D., Johnson M., Kinzler R., Longhi J., Walker D., 1996. Thermobarometry of mafic igneous rocks based on clinopyroxene-liquid equilibria, 0-30 kbar. Contributions to Mineralogy and Petrology, 123, 92-108. Putirka K.D., Mikaelian H., Ryerson F., Shaw H., 2003. New clinopyroxene-liquid thermobarometers for mafic, evolved, and volatile-bearing lava compositions, with applications to lavas from Tibet and the Snake River Plain, Idaho. American Mineralogist, 88, 1542-1554. Qi Q., Taylor L.A., Zhou X., 1995. Petrology and geochemistry of mantle peridotite xenoliths from SE China. Journal of Petrology, 36, 55-79.Sachtleben T.H., Seck H.A., 1981. Chemical control on the Al-solubility in orthopyroxene and its implications on pyroxene geothermometry. Contributions to Mineralogy and Petrology, 78, 157-65.Shaw D.M., 1970. Trace element fractionation during anataxis. Geochimica et Cosmochimica Acta, 34, 237-243.Sun S-S, McDonough W.F., 1989. Chemical and isotopic systematics of oceanic basalts: implications for mantle composition and processes. In Saunders A.D. and Norry, M.J. (eds) Magmatism in the Ocean Basins. Geological Society Special Publication, 42, 313-345.Takahashi E., 1986. Melting of a dry peridotite KLB-1 up to 14 Gpa: implications on the origin of peridotite upper mantle. J. Geophysical Research, 91, 9367-9382.Takahashi E., Kushiro I., 1983. Melting of a dry peridotite at high pressure and basalt magma genesis. American Mineralogist, 68, 859-879.Tamaki K., 1995. Upper mantle extrusion tectonics of southeast Asia and formation of western Pacific backarc basins. In: International Workshop: Cenozoic Evolution of the Indochina Peninsula, Hanoi/Do Son, April, p.89 (Abstract with Programs).Tapponnier P., Lacassin R., Leloup P.H., Shärer U., Dalai Z., Haiwei W., Xiaohan L., Shaocheng J., Lianshang Z., Jiayou Z., 1990. The Ailao Shan/Red River metamorphic belt: Tertiary left-lateral shear between Indochina and South China. Nature, 343(6257), 431-437.Tapponnier P., Peltzer G., La Dain A.Y., Armijo R., Cobbold P., 1982. Propagating extrusion tectonics in Asia: New insights from simple experiments with plasticine. Geology, 7, 611-616.Tatsumoto M., Basu A.R., Huang W., Wang J., Xie G., 1992. Sr, Nd, and Pb isotopes of ultramafic xenoliths in volcanic rocks of eastern China: enriched components EMI and EMII in subcontinental lithosphere. Earth Planet Sci. Letters, 113, 107-128.Taylor S.R., McLennan S.M., 1981. The composition and evolution of the continental crust: rare earth element evidence from sedimentary rocks. Philosophical Transactions of the Royal Society of London, 301, 381-399.Tu K., Flower M.F.J., Carlson R.W., Xie G-H., 1991. Sr, Nd, and Pb isotopic compositions of Hainan basalt (south China): Implications for a subcontinental lithosphere Dupal source. Geology, 19, 567-569.Tu K., Flower M.F.J., Carlson R.W., Xie G-H., Zhang M., 1992. Magmatism in the South China Basin 1. Isotopic and trace-element evidence for an endogenous Dupal component. Chemical Geology, 97, 47-63.Warren J.M., 2016. Global variations in abyssal peridotite compositions. Lithos, 248-251, 193-219.Webb S.A., Wood B.J., 1986. Spinel pyroxene- garnet relationships and their dependence on Cr/Al ratio. Contributions to Mineralogy and Petrology, 92, 471-480.Wells P.R.A., 1977. Pyroxene thermometry in simple and complex systems. Contributions to Mineralogy and Petrology, 62, 129-139.Whitford-Stark J.L., 1987. A survey of Cenozoic olcanism on mainland Asia, special paper, 213. Geological Society of America, 74p.Workman R.K., Hart S.R., 2005. Major and trace element composition of the depleted MORB mantle (DMM). Earth and Planetary Science Letters, 231, 53-72.Zhou P., Mukasa S., 1997. Nd-Sr-Pb isotopic, and major- and trace-element geochemistry of Cenozoic lavas from the Khorat Plateau, Thailand, sources and petrogenesis. Chemical Geology, 137, 175-193.Zindler A., Hart S.R., 1986. Chemical geodynamics. Annual Review of Earth and Planetary Sciences, 14, 493-571.

Sustainable development is a global trend to build a prosperous society, especially to promote green growth towards ecological approach and based on sustainable use of natural resources in the context of climate change. This article, therefore, is an attempt to synthesize the sustainable development process in the world, from the initial awareness of the role of the environment in the development process in the 1980s, to the development of Agenda 21 in the 1990s, to develop and implement the 2030 agenda for sustainable development in the present time. The change in awareness and practice of sustainable development also demonstrates the trend of social-ecological transformation as a development trend and is an urgent requirement towards building a prosperous and sustainable society. Integrating sustainable development into international and national development policies can be considered as a form of promoting social-ecological transformation. The UNESCO’ system of Biosphere Reserves as a model for promoting sustainable development initiatives towards harmony between people and nature can be considered as a model of a social-ecological system. Vietnam as a country actively participating the sustainable development process in the world has made great efforts to build a prosperous and sustainable society. Keywords: Sustainable development, social - ecological transformation, Vietnam. References [1] United Nations, Agenda 2, United Nations Conference on Environment & Development Rio de Janerio, Brazil, 3 to 14 June 1992, pp. 351.[2] IUCN, UNEP, WWF, World Conservation Strategy: Living Resource Conservation for Sustainable Development, 1980, pp. 77.[3] United Nations, Our Common Future, Oxford: Oxford University Press, 1987.[4] Meadows, H. Donella, Meadows, L. Dennis, Randers, Jørgen; Behrens III, W. William, The Limits to Growth; A Report for the Club of Rome's Project on the Predicament of Mankind. New York: Universe Books, 1972.[5] IUCN, UNEP và WWF, Caring for the Earth: A Strategy for Sustainable Living (in Vietnamse), Translation from original copy, Hanoi: Science and Technology Publishing House, 1993, pp. 240.[6] Millennium Ecosystem Assessment (MEA), Ecosystems and Human Well-being: Synthesis. Island Press, Washington, DC, 2005, pp. 102.[7] United Nations, Global Sustainable Development Report, 2015a, pp. 198.[8] United Nations, Transforming our world: the 2030 Agenda for Sustainable Development. A/RES/70/1, 2015b, pp. 40.[9] Liliane Danso-Dahmen, Philip Degenhardt (Eds.), Social-Ecological Transformation Perspectives from Asia and Europe. Published by the Rosa-Luxemburg-Stiftung, 2019, pp. 111.[10] Bass Steve, Conceptual Frameworks for Integrating Sustainable Development Dimensions Paper for UNDESA/UNEP/UNDP Workshop on SD Integration tools, Geneva, 14-15 October 2015.[11] Cejudo, Guillermo M and Cynthia Michel, Addressing fragmented government action: Coordination, coherence, and integration. Paper to be presented at the 2nd International Conference in Public Policy, Milan, July 2015, pp. 22.[12] UN-DESA, Integrated Approaches to Sustainable Development Planning and Implementation. Report of the Capacity Building Workshop and Expert Group Meeting, Department of Economic & Social Affairs, 2015.[13] ESDN, Horizontal Policy Integration and Sustainable Development: Conceptual remarks and governance examples. ESDN Quarterly Report June 2009, http://www.sd-network.eu/quarterly%20reports/report%20files/pdf/2009-June-Horizontal_Policy_Integration_and_Sustainable_Development.pdf.[14] OECD, Guidance on Sustainability Impact Assessment. Organisation for Economic Co-operation and Development, 2010.[15] DFID, Sustainable Livelihoods Guidance Sheets. April 1999, https://www.ennonline.net/dfidsustainableliving.[16] Adams, W.M, The Future of Sustainability: Re-thinking Environment and Development in the Twenty-first Century. Report of the IUCN Renowned Thinkers Meeting, 29-31 January 2006, pp. 18. https://portals.iucn.org/library/sites/library/files/documents/Rep-2006-002.pdf.[17] J. Rockström et al., A safe operating space for humanity, Nature 461(7263), 2009a, 472–475.[18] J. Rockström et al., Planetary Boundaries: Exploring the Safe Operating Space for Humanity. Ecology and Society 14(2), 2009b, 32. [19] Steffen, Will, K. Richardson, J. Rockström, S.E. Cornell, I. Fetzer, E.M. Bennett, R. Biggs, S.R. Carpenter, Wim de Vries, Cynthia A. de Wit, Carl Folke, Dieter Gerten, J. Heinke, G.M. Mace, Linn M. Persson, Veerabhadran Ramanathan, B. Reyers, Sverker Sörlin, Planetary boundaries: Guiding human development on a changing planet. Science 347, 1259855 (2015). DOI: 10.1126/science.1259855.[20] Pisano, Umberto and Gerald Berger, Planetary Boundaries for Sustainable Development: From a conceptual perspective to national applications. ESDN Quarterly Report 30 – October 2013, ESDN Quarterly Report N.30. European Sustainable Development Network, 31 pages, http://www.sd-network.eu/quarterly%20reports/report%20files/pdf/2013-October-Planetary_Boundaries_for_SD.pdf[21] Raworth Kate, From Will these Sustainable Development Goals get us into the doughnut (aka a safe and just space for humanity)? Duncan Green’s discussion on Raworth’s doughnut and SDGs. 2014, http://oxfamblogs.org/fp2p/will-these-sustainable-development-goals-get-us-into-the-doughnut-aka-a-safe-and-just-space-for-humanity-guest-post-from-kate-raworth/[22] Vietnam, Implementation of Sustainable Development: National Report at the UN Conference on Sustainable Development (Rio+20) (in Vietnamese), Ministry of Planning and Investment, Hanoi, May 2012, pp. 82.[23] Vietnam, Voluntary National Review on the Implementation of the Sustainable Development Goals ,Ministry of Planning and Investment, 2018, pp. 90 (in Vietnamese).[24] IMHEN, Integrating Climate Change into Socio-economic Development Plans Viet Nam Institute of Meteorology, Hydrology and Climate Change, Viet Nam Publishing House of Natural Resources, Environment and Cartography, Hanoi, 2012, pp.137 (in Vietnamese).[25] T. Thuc, H.T.L. Huong and D. M. Trang, Technical guidance on integrating climate change into development planning Viet Nam Institute of Meteorology, Hydrology and Climate Change, Viet Nam Publishing House of Natural Resources, Environment and Cartography, Hanoi, 2012, pp. 69 (in Vietnamese).[26] MPI and UNDP, A study on advanced strategic environmental assessment tools for the sustainability assessment of development planning projects, A project on "Strengthening capacity to integrate sustainable development and climate change in planning in Vietnam, Hanoi, 2011, pp. 79 (in Vietnamese).[27] Minister of the Ministry of Planning and Investment, Circular No. 02/2013/TT-BKHDT dated March 27, 2013 guiding the implementation of a number of contents of the Strategy for Sustainable Development in Vietnam for the period 2011-2020), 2013 (in Vietnamese).[28] V.T. Son and T.T. Phuong, Monitoring and evaluation criteria for management effectiveness for biosphere reserves: Practices in the world and applicability in Vietnam (in Vietnamese). Journal of Environment, Topic II, 2018, 12-15.[29] German MAB National Committee. Criteria for Designation and Evaluation of UNESCO Biosphere Reserves in Germany. Publisher: German National Committee for the UNESCO Programme “Man and the Biosphere” (MAB), 1996, pp. 65.[30] V.T. Son et al, Final report of the independent State-level scientific and technological project titled “Research on developing a set of criteria and procedures for monitoring and evaluating the efficiency of management of biosphere reserves in Vietnam”, Code DTLXH, 20/15.2018.

Vietnam is among 30 high TB ​​burden countries even though the Vietnam National TB Program has made great efforts to detect and treat tuberculosis. Objectives: Assessment of Mycobacterial level in sputum before treatment, and susceptibility to the first line anti-TB drugs of M. tuberculosis strains isolated from TB patients with AFB (+) and non-multidrug-resistant. Moreover, factors influencing MGIT outcome after the first 8 weeks of first-line anti-TB drugs therapy in patients with pulmonary tuberculosis was also analysed. Methodology: An observational, analytical study was performed in 128 patients with non-multidrug-resistant pulmonary tuberculosis AFB (+) for evaluating the level of Mycobacteria in sputum before treatment by smear microscopy method; the susceptibility of M. tuberculosis isolated from sputum of the patient was analysed by Lowenstein - Jensen method. Factors affecting positive MGIT results after 2 months of treatment were determined by multivariate logistics regression. Results: The patients had AFB 3+ were 28% in new cases and 24,5% retreatment patients. The rate of M. tuberculosis strains was susceptible to the first line anti-TB drugs in new cases was higher than retreatment patients. The percentage of any anti-TB drug resistance in retreatment tuberculosis was 59,6%, higher than that of new case TB (23,6%). There was high rate of M. tuberculosis strains resistant to Streptomycin and Isoniazid (12,5% and 16,8% for new cases; 42,3% and 36,5% for retreatment cases, respectively). Large radiographic chest lesions and high AFB levels in pre-treatment sputum were factors associated with a positive MGIT result after the first 8 weeks of treatment. Conclusion: Most of TB patients had high level of Mycobacteria in sputum samples collected before treatment. The percentage of M. tuberculosis strains isolated from sputum of pulmonary non MDR-TB patients had any anti-TB drug resistance were high. High Mycobacteria level in pre-treatment sputum and radiographic chest lesions related to positive MGIT result after the first 8 weeks of treatment. Keywords Pulmonary tuberculosis, first-line anti-TB drugs, anti-TB drug resistance, susceptibility, M. tuberculosis. References [1] World Health Organization, Global Tuberculosis Report 2020. Tuberculosis profiles: Viet Nam (2020) Available: https://worldhealthorg.shinyapps.io/tb_profiles/?_inputs_&entity_type=%22country%22&lan=%22EN%22&iso2=%22VN%22 (accessed 10 April 2020).[2] L.T. Luyen, N.V. Hung, Methods for Diagnosis in Tuberculosis, in Le Thi Luyen (Ed), Tuberculosis - Textbook for General Medical Students. Vietnam National University Press, Hanoi, 2020, pp: 47-69 (in Vietnamese).[3] Ministry of Health - National Tuberculosis Programme Guideline for Standard Operating Procedures of Microbiology Laboratory Methods for Mycobacteria. Vietnam National Tuberculosis Programme, Hanoi (2013) (in Vietnamese).[4] Ministry of Health (2018) Guideline for Management, Diagnosis and Treatment for Tuberculosis. (in Vietnamese) Available: https://kcb.vn/vanban/quyet-dinh-so-3216-qd-byt-ngay-23-5-2018-ve-viec-ban-hanh-huong-dan-chan-doan-dieu-tri-va-du-phong-benh-lao (Accessed 12 January 2019)[5] A.P. Ralph, M. Ardian, A. Wiguna et al. A simple, valid, numerical score for grading chest x-ray severity in adult smear-positive pulmonary tuberculosis. Thorax 2010 Oct;65(10):863-869. https://doi.org/10.1136/thx.2010.136242[6] C.T. Minh, L.T. Luyen, N.T.L. Huong et al. Plasma concentration of anti-tubeculosis drugs in pulmonary tuberculosis patients, who treatment in National Tuberculosis and Lung Diseases Hospital 2008 Journal of Practical Medicine 651(2009) 50-53 (in Vietnamese).[7] N.V. Nhung, N.B. Hoa, D.N. Sy, C.M. Hennig, A.S. Dean (2015) The fourth national anti-tuberculosis drug resistance survey in Viet Nam. Int J Tuberc Lung Dis. Jun 2015 19(6) 670-675. https://doi.org/10.5588/ijtld.14.0785[8] N.T. Hang, S. Maeda, L.T. Lien, et al. Primary drug-resistant tuberculosis in Hanoi, Viet Nam: present status and risk factors. PloS one 8(8) (2013) e71867. https://doi.org/10.1371/journal.pone.0071867[9] R. Hafner, J.A. Cohn, D.J. Wright, et al. Early bactericidal activity of isoniazid in pulmonary tuberculosis. Optimization of methodology. The DATRI 008 Study Group. Am J Respir Crit Care Med 156 (1997) 918–923. https://doi.org/10.1164/ajrccm.156.3.9612016[10] A. Jindani, V.R. Aber, E.A. Edwards, D.A. Mitchison. The early bactericidal activity of drugs in patients with pulmonary tuberculosis. Am J Respir Crit Care Med. 121(1980)(6) 939-949. Available: https://www.atsjournals.org/doi/10.1164/arrd.1980.121.6.939 (Accessed 12 January 2019).[11] H.L. Rieder. Intervention for Tuberculosis Control and Elimination. International Union of Tuberculosis and Lung Diseases, Paris, France, 2002.

Abstract Background Hepatitis E virus (HEV) is a zoonotic disease and has been reported around the world. The main objective of this study was to evaluate the sero-prevalence and phylogenetic analysis of HEV in Vietnam. Pig blood and fecal pooled samples were collected to assess the prevalence of HEV. We assessed the true prevalence (TP) of HEV from apparent prevalence (AP) by taking into account the sensitivity and specificity of diagnostic tests using a Bayesian approach. For phylogenetic analysis, the data compared with worldwide HEV reference strains including all eight genotypes (G1-G8) which were identified in previous study. Results A total of 475 sera and 250 fecal pooled samples were collected at slaughterhouses and pig farms from five provinces, in Viet Nam. Overall, the sero-AP of HEV was 58.53% (95% confidence interval: 53.95–62.70) while the sero-TP was slightly higher (65.43, 95% credible interval: 47.19–84.70). In terms of pooled samples, overall, the RNA-AP was 6.80% (95% confidence interval: 4.01–10.66). One strain in Hanoi, two strains in Dak Lak, seven strains in An Giang, four strains in Son La and two strains in Nghe An were isolated. The phylogenetic tree demonstrated that 19 Vietnamese strains were clustered into HEV 3 and 4. Conclusions This study provided evidence that HEV is circulating in domestic pigs in Vietnam. From a public health perspective, it is very important to raise public awareness for high-risk groups (e.g. slaughterhouse workers, pig traders, farmers and market sellers) who have more opportunities to come in contact with pig and contaminated meats.

Abstract Background As in many other low and middle income countries (LIMCs), Vietnam has experienced a major growth in the pharmaceutical industry, with large numbers of pharmacies and drug stores, and increasing drug expenditure per capita over the past decade. Despite regulatory frameworks that have been introduced to control the dispensing and use of prescription-only drugs, including antibiotics, compliance has been reported to be strikingly low particularly in rural parts of Vietnam. This qualitative study aimed to understand antibiotic access and use practices in the community from both supplier and consumer perspectives in order to support the identification and development of future interventions. Methods This qualitative study was part of a project on community antibiotic access and use (ABACUS) in six LMICs. The focus was Ba Vi district of Hanoi capital city, where we conducted 16 indepth interviews (IDIs) with drug suppliers, and 16 IDIs and 6 focus group discussions (FGDs) with community members. Drug suppliers were sampled based on mapping of all informal and formal antibiotic purchase or dispensing points in the study area. Community members were identified through local networks and relationships with the field collaborators. All IDIs and FGDs were audio-taped, transcribed and analysed using content analysis. Results We identified a large number of antibiotic suppliers in the locality with widespread infringements of regulatory requirements. Established reciprocal relationships between suppliers and consumers in drug transactions were noted, as was the consumers’ trust in the knowledge and services provided by the suppliers. In addition, antibiotic use has become a habitual choice in most illness conditions, driven by both suppliers and consumers. Conclusions This study presents an analysis of the practices of antibiotic access and use in a rural Vietnamese setting. It highlights the interactions between antibiotic suppliers and consumers in the community and identifies possible targets for interventions.

Oily waste-water is generated in many industrial processes, such as oil refining, oil storage, exploration, transportation, washing ... Oily waste water poses a great problem with water environment, ecosystem and human health. Nowadays, application of microbial biofilm for the removal of oil and derivatives from contaminated environments has received much attention. Microbial biofilms are defined as complex coherent structure of cells and cellular products, which are attached on solid surface. In biofilm structure, microorganisms increase their ability to grow and survive in changing environmental conditions and increase their access to absorb substrates or nutrients. This study focused on the degradation of hydrocarbon components contaminated in oil polluted waste water by biofilm formed by a mixture of bacterial and yeast strains isolated from oil contaminated water in Viet Nam attached on coconut fiber carriers in 2000 liter system. As the results, biofilm attached on coir carrier could degrade 62% after 5 days and 99,9% after 7 days of the total amount of oil with the initial concentration of 31.950 mg/l. Phenol and polycyclic aromatic hydrocarbons (PAHs) also were degraded up to 99.9% phenol and more than 94,8%PAHs in oily wastewater. This result gave hint to develop new method to treat petroleum oil contaminated water in Vietnam.

Vietnam embarked on fundamentally building a public debt management system since 2009 as the Law of Public Debt Management was designed and promulgated. From then Vietnam has been following the typical model of public debt management used by developing countries, the market – based model which encompasses gradual building and completion of domestic market for government bond. However, because of several limitations in the national system of public debt management, the current model needs to be improved in alignment with the development level of Vietnam’s economy. Especially, economic shocks such as the 2009 financial crisis or Covid 19 which has increased dramatically the scope of public debt also urge a more technical and effective model. The paper focuses on analyzing the practical models of public debt management in the world and subsequently the current situation of Vietnam’s model. On that basis, the author figures out the limitations of the model and proposes a number of solutions to upgrade the model in accordance with the international practice regarding model of public debt management suitable with development level of economy. Keywords Public debt, sustainable public debt, public debt management, risk management, model of public debt management. References [1] D.Q. Bao, The science of Management and Organization Statistical Publishing House, Hanoi, 1999 (in Vietnamese),[2] IMF, Defining the Government’s debt and deficit, Working paper, WP/15/238, 2015.[3] IMF, Revised guidelines for public debt management, IMF Policy paper, 2014.[4] WB, Government debt management: Designing debt management strategies, Debt management learning & training note, 2017. [5] E. Currie, J. Dethier and E. Togo, Institutional arrangements for Public Debt Management, World Bank Policy Research Working Paper 3021, 2003.[6] E.C. Pascal, The debt office and the effective debt management functions: an institutional and operational framework, Public debt and Public Finance Working Paper, 2006.[7] H. Bohn, Tax Smoothing with Financial Instruments, American Economic Review, 80/5 (1990) pp 1217–1230.[8] J. Tobin, An Essay on the Principles of Debt Management, Fiscal and Debt Management Policies, 2 (1963), Reprinted in J. Tobin Essays in Economics, vol.1, Amsterdam: North Holland, 1971.[9] E. Togo, Coordinating Public Debt Management with Fiscal and Monetary Policies: An Analytical Framework, World Bank Policy Research Working Paper, No. 4369, 2007.[10] L. Hoogduin, B. Ozturk & P.Wierts, Public debt managers’ behavior: interactions with macro policies, DNB Working paper No.273, 2010.[11] WB, Debt management performance assessment (DeMPA) methodology, 2015.[12] R. Cabral, How strategically is public debt being managed around the globe? A survey on public debt management strategies, WB Financial advisory and Banking department report, 2015.[13] C. Aslan, A. Ajazaj & S.A. Wahidh, Study on Public debt management system and results of a survey on solutions used by debt management office, WB Financial advisory and Banking department report, 2018.[14] IMF, G-20 note: Improving public debt recording, monitoring, and reporting capacity in low and lower middle-income countries: proposed reforms, 2018.[15] A.A. Badurina, S. Svaljek, Public debt management before, during and after the crisis, Finance theory and practice, 36(1) (2012) 73 – 100.[16] I. Storkey, Sound practice, in: M. Williams and P. Brione (Eds.), Government Debt Management: New Trends and Challenge, Central Banking Publications Ltd, London, 2006, pp 300 – 325.[17] G. Wheeler, Sound Practice in Government Debt Management, The World Bank Publication, Washington D.C, 2004. doi. 10.1596/0-8213-5073-0.[18] National Treasury Management Agency, Ireland Information Memorandum 2010, National Treasury Management Agency, Dublin, 2010.[19] M. Williams, The growing responsibilities of debt management offices, in: M. Williams, P. Brione (Eds.), Government Debt Management: New Trends and Challenge, Central Banking Publications Ltd, London, 2006, pp 258 – 273.[20] H.N. Au, Public debt management in Vietnam in the international integration period (in Vietnamese), https://hcma.vn/Uploads/2018/8/8/Hoang%20Ngoc%20Au%20-%20Luan%20an%20-%20CN%20Quan%20ly%20kinh%20te.pdf, 2018 (accessed 20 August 2020).[21] T. Phung, Firmly maintaining the country’s credit rate (in Vietnamese), http://tapchitaichinh.vn/su-kien-noi-bat/tiep-tuc-giu-vung-muc-xep-hang-tin-nhiem-quoc-gia-325601.html, 2020 (accessed 21 August 2020).[22] N.T. Binh, The factors affecting the efficiency of public debt management in Vietnam (in Vietnamese), http://www.tapchicongthuong.vn/bai-viet/cac-yeu-to-anh-huong-toi-hieu-qua-quan-ly-no-cong-o-viet-nam-73005.htm, 2020 (accessed 22 August 2020).[23] T. Anh, Six solutions for public management in the new context (in Vietnamese), http://tapchitaichinh.vn/su-kien-noi-bat/6-giai-phap-quan-ly-no-cong-trong-boi-canh-moi-308263.html, 2019 (accessed 23 August 2020).

This study analyzes the direct treatment cost for exacerbation of chronic obstructive pulmonary disease (COPD) at the Department of Pulmonology, E Hospital from October 2019 to March 2020. The study results show that the average direct treatment cost for exacerbation of COPD was VND 9,102,311.71; the highest cost was VND 36,304,614 and the lowest cost, VND 2,309,961. Among the direct treatment cost components, drug cost showed the highest proportion, followed by hospital bed, then surgical procedures, tests, diagnostic imaging, functional exploration, examination and medical supplies. The cost of antibiotics accounted for 57.76% of the drug cost. The average number of hospitalization days was 10.77, closely relating to the direct cost. Besides, age and comorbidity also affected the number of hospitalization days. The average health insurance support for each patient was up to 94.46% of the total treatment cost. The results also show that the cost of treatment in Vietnam is lower than some countries in the region and the proportions of the cost components presented in different studies in Vietnam are different. Keywords Direct cost, exacerbation of COPD, E hospital. [1] Ngo Quy Chau, Nguyen Lan Viet, Nguyen Dat Anh, Pham Quang Vinh, Internal Pathology, Medical Publishing House 1 (2018) 42-50 (in Vietnamese).[2] R.A. Pauwels, A.S. Buist, P.M.A. Calverley, C. R. Jenkins, S. Hurd Global strategy for the diagnosis, management, and prevention of chronic obstructive pulmonary disease. Am J Respir Crit Care Med 163 (2001) 1256–1276. https://doi.org/10.1164/ajrccm.163.5.2101039[3] https://www.chestnet.org/News/Press-Releases /2014/07/CDC-reports-36-billion-in-annual financial-cost-of-COPD-in-US (15/10/2019)[4] S.D. Sullivan, S.D. Ramsey, T.A. Lee, The economic burden of COPD. Chest 2000 Feb 117(2), 5S-9S.https://journal.chestnet.org/article/S0012-3692(15)52748-7/fulltext[5] Vanfleteren, E.G.W. Lowie, et al Clusters of comorbidities based on validated objective measurements and systemic inflammation in patients with chronic obstructive pulmonary disease American journal of respiratory and critical care medicine 187(7) (2013) 728-735. https://www.atsjournals.org/doi/full/10.1164/rccm.201209-1665oc [6] Doan Quynh Huong Analysis of direct costs of inpatient treatment for EPI in Respiratory Center of Bach Mai Hospital from 2013-2015, 2017 (in Vietnamese).[7] Vu Xuan Phu, Duong Viet Tuan, Nguyen Thu Ha et al., Inpatient treatment costs of patients with chronic obstructive pulmonary disease at central lung hospital, 2009, Journal of Practical Medicine 1 (2012) 51-53 (in Vietnamese).http://yhth.vn/chi-phi-dieu-tri-noi-tru-cua-benh-nhan-benh-phoi-tac-nghen-man-tinh-tai-benh-vien-phoi-trung-uong-nam-2009_t3254.aspx[8] C.S. Rand, M. Nides, M.K. Cowles, R.A. Wise, J. Connett, Long-term metered-dose inhaler adherence in a clinical trial. The lung health study research group. Am J Respir Crit Care Med, Aug 152(2) (1995) 580-8. https://doi.org/10.1164/ajrccm.152.2.7633711[9] Phan Thi Thanh Hoa, Clinical features, clinical and direct treatment costs of patients with chronic obstructive pulmonary disease at Respiratory Center - Bach Mai Hospital Graduation thesis general practitioner, Hanoi Medical University 2013 (in Vietnamese).

Cardiovascular disease is the leading cause of death in the world. Cardiovascular risk assessment is an important step in preventing and treating the disease. The current study assesses the 10-year risk of cardiovascular disease in 306 VNU’s office workers in 2016-2017 based on the 2008 Framingham Risk Score. The study results show that the average risk score was 4.05 ± 4.76%; low risk was 90.52%; moderate risk: 7.85 %; and high to very high risk was 1.63%. Men have a higher risk score than women (p <0.001). The ten-year cardiovascular risk score shows that age and systolic blood pressure correlated with the risk at a medium level, and cholesterol and HDL correlated with it at a low level. Keywords Framingham Risk Score 2008, 10-year cardiovascular risk score, hypertension, blood cholesterol, blood HDL. References [1] Cardiovasculardiseases, http://www.who.int/en/newsroom/factsheets/detail/cardiovascular diseases-(cvds), (truy cập ngày 22/03/2019).[2] A.R. Gregory et al, Global, regional, and national burden of cardiovascular diseases for 10 Causes, 1990 to 2015, Journal of the American college of cardiology. 70(1) (2017) 1–25.[3] E. Gresham, T.E. Fitzpatrick, P.A. Wolf et al, Residual disability in survivors of stroke--the Framingham study, N Engl J Med. 293(19) (1975) 954–956.[4] T.A. Pearson, S.N. Blair, S.R. Danielset et al, AHA guidelines for primary prevention of cardiovascular disease and stroke: 2002 update: consensus panel guide to comprehensive risk reduction for adult patients without coronary or other atherosclerotic vascular diseases, American heart association science advisory and coordinating committee, Circulation. 106(3) (2002) 388–391.[5] I. Graham, D. Atar, K. B. Johnsen et al, European guidelines on cardiovascular disease prevention in clinical practice: full text - Fourth joint task force of the European society of cardiology and other societies on cardiovascular disease prevention in clinical practice constituted by representatives of nine societies and by invited experts, Euro heart J. 28(19) (2007) 2375-2414.[6] S.S. Mahmood, D. Levy, R.S. Vasanet et al, The Framingham heart study and the epidemiology of cardiovascular diseases: a historical perspective, Lancet. 383(9921) (2014) 999–1008.[7] J.A.A.G. Damen, L. Hooft, E. Schuit et al, Prediction models for cardiovascular disease risk in the general population: systematic review, BMJ. 353(2016) 1-10.[8] L.Q.H. Goh, T.A. Welborn, S.S. Dhaliwal, Independent external validation of cardiovascular disease mortality in women utilising Framingham and SCORE risk models: a mortality follow-up study, BMC women health. 14 (2014) 118-129.[9] L.M. A. Rodenas, J.A. C. Herencia, J.A. D. Garrote et al, Framingham risk score for prediction of cardiovascular diseases: a population-based study from southern Europe, PLoS One. 8(9) (2013) 1-10.[10] G.M. Park, Y.H. Kim, Model for predicting cardiovascular disease: insights from a Korean cardiovascular risk model, Pulse (Basel). 3(2) (2015) 153–157.[11] Trần Kim Trang, Nguy cơ 10 năm của bệnh tim mạch ở nữ giới tăng huyết áp, Y học thành phố Hồ Chí Minh. 16(1) (2012) 181-185.[12] Trương Thanh Sơn, Nguyễn Văn Trí, Trương Quang Bình, Nghiên cứu áp dụng thang điểm Framingham nhằm định nguy cơ bệnh động mạch vành trong 10 năm tới tại bệnh viện đa khóa Bình Dương, Y học thành phố Hồ Chí Minh. 15(1) (2011) 207-212. [13] Nguyễn Thị Kim Thủy, Dự báo nguy cơ mắc bệnh động mạch vành trong 10 năm theo thang điểm Frammingham ở bệnh nhân tăng huyết áp nguyên phát, Y học thực hành. 802(1) (2012) 27-29. [14] Nguyễn Hồng Huệ, Nguyễn Đức Công, Nghiên cứu ước tính nguy cơ bệnh động mạch vành trong 10 năm tới theo thang điểm Framingham qua 500 trường hợp, Y học thành phố Hồ Chí Minh. 15(2) (2011) 38-44. [15] C.V. Aram et al, The seventh report of the joint national committee on prevention, detection, evaluation, and treatment of high blood pressure, National heart, lung and blood institute - National institutes of health, NIH publication no. 04-5230, US, (2014), pp 13.[16] National Heart, Lung and Blood Institute, Third Report of the national cholesterol education program (NCEP) expert panel on detection, evaluation, and treatment of high blood cholesterol in adults (Adult treatment panel III) Final report, National institutes of health, part II, US, (2002), pp 5-10. [17] World Health Organization, The Asia-Pacific perspective: redefining obesity and its treatment, Geneva: World health organization western pacific regional office, (2000), 18-19.[18] N.Q. Nguyen, S.T. Pham, L.D. Do et al, Cardiovascular disease risk factor patterns and their implications for intervention strategies in Vietnam, Int J Hypertens, ID. 560397, (2012), 1-11.[19] M. Nakhaie, B. Koor, S. Salehiet al, Prediction of cardiovascular disease risk using framingham risk score among office workers, Iran, 2017, Saudi journal of kidney diseases and transplantation. 29(3) (2018) 608-614. [20] Trịnh Xuân Thắng, Nghiên cứu các yếu tố nguy cơ bệnh tim mạch ở người >25 tuổi tại 2 quận huyện Hà Nội, Luận văn thạc sỹ, Đại học Y Hà Nội, (2013). [21] Nguyễn Hoàng Liên, Văn Thế Trung, Xác định nguy cơ tim mạch theo thang điểm Framingham trên bệnh nhân vẩy nến tại bệnh viện da liễu TP. Hồ Chí Minh, Y Học TP. Hồ Chí Minh, 18(1), (2014), 79-85. [22] R. Gupta, V. Kaul, A. Agrawalet et al, Cardiovascular risk according to educational status in India, Preventive medicine. 51(5) (2010) 408–411.[23] C.A. Jones, L. Ross, N. Suraniet al, Framingham ten-year general cardiovascular disease risk: agreement between BMI-based and cholesterol-based estimates in a South Asian convenience sample, PLOS ONE. 10(3) (2015) e0119183.[24] K.S. Tyrrell, H.C. Lassila, E. Meilahn et al, Carotid atherosclerosis in premenopausal and postmenopausal women and its association with risk factors measured after menopause, Stroke. 29(6) (1998) 1116–1121.[25] Margaret Kelly Hayes et al, Influence of age and health behaviors on stroke risk: lessons from longitudinal studies, J Am Geriatr Soc. 58(2) (2010) 325–328.[26] D. Sugiyama, T. Okamura, M. Watanabe et al, Risk of hypercholesterolemia for cardiovascular disease and the population attributable fraction in a 24-year Japanese cohort study, J Atheroscler Thromb. 22(1) (2015) 95–107.[27] M.R. Law, N.J. Wald, S.G. Thompson, By how much and how quickly does reduction in serum cholesterol concentration lower risk of ischaemic heart disease, BMJ. 308(6925) (1994) 367–372.[28] Abolfazl Mohammadbeigi et al, Dyslipidemia prevalence in Iranian adult men: the impact of population-based screening on the detection of undiagnosed patients, World J men health. 33(3) (2015) 167-173. [29] R.S. Joshi et al, Prevalence of dyslipidemia in urban and rural India: The ICMR–INDIAB Study, PloS ONE. 9(5) (2014) 1-9.[30] Wichai Aekplakorn et al, Prevalence of dyslipidemia and management in the Thai population: national health examination survey IV, 2009, Journal of lipids. (2014) 1-13.[31] Asia Pacific, Cohort Studies Collaboration, cholesterol, diabetes and major cardiovascular diseases in the Asia-pacific region, Diabetologia. 50(11) (2003) 2289-2297.[32] S. Lewington, R. Clarke, N. Qizilbash, R. Peto, R. Collins et al, Age-specific relevance of usual blood pressure to vascular mortality: a meta-analysis of individual data for one million adults in 61 prospective studies, Lancet. 360(9349) (2002) 1903–1913.[33] Viet Nam national STEPS Survey 2015, https://www.who.int/ncds/un-task-force/steps-survey-vietnam2015.pdf, (2015), (truy cập ngày 09/03/2019).[34] Nguyễn Lân Việt, Kết quả mới nhất điều tra tăng huyết áp toàn quốc năm 2015 – 2016, Hội tim mạch Việt Nam, http://www.yhth.vn/hoinghitanghuyetapvietnamlanthuii_d3378.aspx, (2016) (truy cập ngày 11/02/2019).[35] M. Satoh, et al, Combined effect of blood pressure and total cholesterol levels on long-term risks of subtypes of cardiovascular death: evidence for cardiovascular prevention from observational cohorts in Japan, hypertension. 65(3) (2015) 517–524.