Distribution of Elite Students in Vietnam Revealed by National Olympiads

Mapping Intimacies ◽

10.31235/osf.io/qp2ay ◽

2020 ◽

Author(s):

Duy Nghia Pham

Keyword(s):

Social Science ◽

Ethnic Minority ◽

Minority Students ◽

Natural Science ◽

Red River ◽

Male Students ◽

Red River Delta ◽

North Central ◽

The North ◽

Science Test

Vietnamese National Olympiads 2010-2020 has awarded elite students more than 24,000 prizes. Provinces in the Red River Delta and the North Central Coast with their high schools for the gifted led the country in the number of elite students and the proportion of highest achievers. In comparison with social science test subjects, natural science subjects were more characterized by younger students and male students and less represented by ethnic minority students.

Download Full-text

Preliminary results of the study on the reasons of the Hai Hau erosion phenomenon

Vietnam Journal of Mechanics ◽

10.15625/0866-7136/29/3/5550 ◽

2007 ◽

Vol 29 (3) ◽

pp. 415-426

Author(s):

Pham Van Ninh ◽

Phan Ngoc Vinh ◽

Nguyen Manh Hung ◽

Dinh Van Manh

Keyword(s):

Mathematical Modeling ◽

Historical Data ◽

Middle Part ◽

Red River ◽

Erosion Process ◽

Red River Delta ◽

The North ◽

Severe Erosion ◽

North And South ◽

Very High

Overall the evolution process of the Red River Delta based on the maps and historical data resulted in a fact that before the 20th century all the Nam Dinh coastline was attributed to accumulation. Then started the erosion process at Xuan Thuydistrict and from the period of 1935 - 1965 the most severe erosion was contributed in the stretch from Ha Lan to Hai Trieu, 1965 - 1990 in Hai Chinh - Hai Hoa, 1990 - 2005 in the middle part of Hai Chinh - Hai Thinh (Hai Hau district). The adjoining stretches were suffered from not severe erosion. At the same time, the Ba Lat mouth is advanced to the sea and to the North and South direction by the time with a very high rate.The first task of the mathematical modeling of coastal line evolution of Hai Hau is to evaluate this important historical marked periods e. g. to model the coastal line at the periods before 1900, 1935 - 1965; 1965 - 1990; 1990 - 2005. The tasks is very complicated and time and working labors consuming.In the paper, the primarily results of the above mentioned simulations (as waves, currents, sediments transports and bottom - coastal lines evolution) has been shown. Based on the obtained results, there is a strong correlation between the protrusion magnitude and the southward moving of the erosion areas.

Download Full-text

Assessment of the sustainability of the rice-maize cropping system in the Red River Delta of Vietnam and developing reduced tillage practices in rice-maize system in the area

Journal of Vietnamese Environment ◽

10.13141/jve.vol5.no1.pp1-7 ◽

2014 ◽

Vol 5 (1) ◽

pp. 1-7

Author(s):

Thi Thanh Ly Le

Keyword(s):

Cropping System ◽

River Delta ◽

Red River ◽

Viet Nam ◽

Red River Delta ◽

Maize Crop ◽

Tillage Practices ◽

Land Use Efficiency ◽

The North ◽

System Sustainability

Rice and maize are global staple food and play an important role in world’s food security strategy. Vietnam is one of rice leading export countries but annually it has to import a considerate amount of maize for cattle food processing. Red River Delta in the north of Vietnam is the second rice bucket of the country, which is responsible for more than 20% of total rice production. The priority crops in the areas are rice and maize and rice-maize system is the leading cropping system in the area. Currently, it is reported that the rice-maize cropping system is not sustainable and its profit is reducing in most of production areas in the Red River Delta. Improving rice cropping system aims is not only to increase rice and maize yields and production but also to improve the land use efficiency, decline the cost of the production and to increase system sustainability. To increase sustainability there must be a linkage of various factors. This review emphasizes on increasing rice-maize crop sustainability by applying appropriate agriculture practices such as reducing chemical fertilization and intensive tillage. Gạo và ngô là nguồn lương thực chính cho toàn cầu và đóng một vai trò quan trọng trong chiến lược an ninh lương thực của thế giới. Việt Nam là một trong những nước dẫn đầu về xuất khẩu gạo nhưng hàng năm vẫn phải nhập một số lượng lớn ngô để chế biến thức ăn gia súc. Đồng bằng sông Hồng là một trong hai vựa lúa lớn của Việt Nam sản xuất khoảng 20% sản lượng lúa gạo của cả nước. Ở đồng bằng sông Hồng, lúa và ngô là hai cây trồng chính là hệ canh tác lúa-ngô là cơ cấu cây trồng hàng đầu trong vùng. Tuy nhiên, trong những năm gần đây, rất nhiều đánh giá cho thấy hệ thống canh tác lúa-ngô là hệ thống canh tác không bền vững và các lợi nhuận của mang lại từ cơ cấu canh tác ở hầu hết các khu vực sản xuất ở vùng đồng bằng sông Hồng của Việt Nam đã và đang giảm dần. Do đó, việc cải thiện cơ cấu canh tác lúa -ngô không chỉ nhằm mục đích tăng năng suất lúa và ngô mà còn nâng cao hiệu quả sử dụng đất, giảm chi phí sản xuất và tăng cường hệ thống canh tác bền vững. Tuy nhiên, để tăng tính bền vững của hệ thống canh tác thì phải liên kết nhiều yếu tố khác nhau. Bài viết này dựa vào các kết quả nghiên cứu của các tác giả khác nhau để đưa ra những giải pháp tích cực làm tăng tính bền vững của hệ thống canh tác lúa - ngô bằng cách áp dụng các phương pháp canh tác hợp lý như giảm sử dụng phân hóa học và các biện pháp canh tác thâm canh như áp dụng phương pháp làm đất tối thiểu.

Download Full-text

Performance of SEACLID/CORDEX-SEA multi-model experiments in simulating temperature and rainfall in Vietnam

Vietnam Journal of Earth Sciences ◽

10.15625/0866-7187/41/4/14259 ◽

2019 ◽

Vol 41 (4) ◽

pp. 374-387 ◽

Cited By ~ 1

Author(s):

Nguyen Thi Tuyet ◽

Ngo Duc Thanh ◽

Phan Van Tan

Keyword(s):

Southeast Asia ◽

Climate Models ◽

Global Climate ◽

Regional Climate ◽

Global Climate Models ◽

Red River ◽

Observation Data ◽

Red River Delta ◽

North Central ◽

Climate Downscaling

The study examined the performance of six regional climate experiments conducted under the framework of the Southeast Asia Regional Climate Downscaling/Coordinated Regional Climate Downscaling Experiment-Southeast Asia (SEACLID/CORDEX-SEA) project and their ensemble product (ENS) in simulating temperature at 2 m (T2m) and rainfall (R) in seven climatic sub-regions of Vietnam. The six experiments were named following the names of their driving Global Climate Models (GCMs), i.e., CNRM, CSIRO, ECEA, GFDL, HADG and MPI. The observation data for the period 1986–2005 from 66 stations in Vietnam were used to compare with the model outputs. Results showed that cold biases were prominent among the experiments and ENS well reproduced the seasonal cycle of temperature in the Northeast, Red River Delta, North Central and Central Highlands regions. For rainfall, all the experiments showed wet biases and CSIRO exhibited the best. A scoring system was elaborated to objectively rank the performance of the experiments and the ENS experiment was reported to be the best.

Download Full-text

Diversity and Distribution of Rice Blast (Pyricularia oryzae Cavara) Races in Vietnam

Plant Disease ◽

10.1094/pdis-05-19-1008-re ◽

2020 ◽

Vol 104 (2) ◽

pp. 381-387 ◽

Cited By ~ 1

Author(s):

Nguyen T. M. Nguyet ◽

Hoang H. Long ◽

Nguyen B. Ngoc ◽

Nguyen T Nhai ◽

Nguyen T. T. Thuy ◽

...

Keyword(s):

Resistance Genes ◽

Rice Blast ◽

Pyricularia Oryzae ◽

Red River ◽

Red River Delta ◽

North Central ◽

South Central ◽

Central Vietnam ◽

Differential Varieties ◽

Reaction Patterns

A total of 239 isolates of blast (Pyricularia oryzae Cavara) collected from northern and central Vietnam showed a wide variation in pathogenicity based on the reaction patterns to 25 differential varieties (DVs) harboring 23 resistance genes and susceptible cultivar Lijiangxintuanheigu (LTH). The frequencies of isolates virulent toward DVs for Pish, Pik-m, Pi1, Pik-h, Pik, Pik-p, Pi7(t), Pi9(t), Piz-5, Pita-2, and Pita were low, but they were high for DVs for Pib, Pit, Pia, Pii, Pi3, Pi5(t), Pik-s, Piz, Piz-t, Pi12(t), Pi19(t), and Pi20(t). Isolates were classified into three cluster groups Ia, Ib, and II based on reaction patterns to DVs and LTH. The frequencies of isolates virulent toward 11 DVs for Pik-m, Pi1, Pik-h, Pik, Pik-p, Pi7(t), Pi9(t), Piz, Piz-5, Pita-2, and Pita in cluster II and DV for Piz-t were higher and lower than those of Ia and Ib, respectively. The frequencies to DVs for Pii, Pi3, Pi5(t), and Piz-t were different between clusters Ia and Ib. Clusters Ia and Ib were distributed with similar frequencies in the northeast, north central, and south central coast regions, but the frequencies among three cluster groups in the Red River Delta and northwest regions were different. This means that the blast races in these two regions were different from the others. Overall, the blast isolates were categorized into 153 races. Among them, 26 were selected as a set of standard differential blast isolates for characterizing 23 resistance genes and developing a differential system in Vietnam.

Download Full-text

NGHIÊN CỨU MÂU THUẪN VÀ LỰA CHỌN ƯU TIÊN TRONG QUY HOẠCH TỔNG HỢP KHÔNG GIAN VEN BIỂN HUYỆN HẢI HẬU - NGHĨA HƯNG TỈNH NAM ĐỊNH

Tạp chí Khoa học và Công nghệ Biển ◽

10.15625/1859-3097/20/1/13294 ◽

2020 ◽

Vol 20 (1) ◽

Author(s):

Hoang Quoc Lam ◽

Nguyen An Thinh

Keyword(s):

Natural Resources ◽

Environmental Protection ◽

High Speed ◽

Red River ◽

Economic Sectors ◽

Red River Delta ◽

Space Planning ◽

The North ◽

Marine Economy ◽

Coastal Space

Hai Hau - Nghia Hung are two coastal districts in the Southeast of Nam Dinh province with total area of 35,652.29 km2. Located in the middle between the Southern provinces of the Red river delta and the North Central provinces, Hai Hau and Nghia Hung are about 100 km from Hanoi along National Route 1A and 80 km from Hai Phong, in an area directly affected by the Hanoi - Hai Phong - Quang Ninh growth triangle. The two districts have an approximately 47 km coastline accounting for over 65% of the coastline of the province. Along the coastline there are four rivers: Red river, So river, Ninh Co river and Day river emptying into the sea through the estuaries: Ba Lat, Ha Lan, Ninh Co and Day, which facilitate the development in industry, agriculture, sea ports, trade, tourism... This is also a region with high-speed economic development and a series of plannings. Thus, a number of conflicts in exploiting and using natural resources and environmental protection have been raised, leading to destroyed sceneries, lost ecological balance, and becoming an anxious problem. This paper presents experimental results in defining the conflicts and priorities between sectors and economic fields in integrated coastal space planning of Hai Hau - Nghia Hung districts to select the economic sectors that have the most potential and advantages. Therefore, it will be appropriate in space usage in exploiting and using natural resources and environmental protection, which will provide the basis for the development of a sustainable marine economy.

Download Full-text

Psychiatry in Vietnam: a personal impression

Psychiatric Bulletin ◽

10.1192/pb.21.12.779 ◽

1997 ◽

Vol 21 (12) ◽

pp. 779-780 ◽

Cited By ~ 1

Author(s):

John Wallace

Keyword(s):

Mekong Delta ◽

River Delta ◽

Red River ◽

Eastern Coast ◽

Red River Delta ◽

The Past ◽

The North ◽

South Vietnam ◽

The World ◽

North And South

After the fall of South Vietnam to North Vietnamese forces in 1975, Vietnam has remained virtually isolated from the rest of the world. With the global political changes of the past 10 years. the Hanoi Government succeeded in reducing Vietnam's international isolation in part by attempting to open the country's door to foreign visitors. The country stretches along the eastern coast of the Indo-Chinese peninsula and is slightly larger than Italy. It is ‘S-shaped’, broad in the north and south and very narrow in the centre (Fig. 1). The country's main cultivated areas are the Red River delta in the north and the Mekong delta containing Ho Chi Min city (Saigon) in the south.

Download Full-text