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No
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Title
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Authors
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Journal
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Abstract
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1
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Preliminary Identification of Porcine Deltacoronavirus (PDCoV) from pigs in Hanoi and Thai Binh
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Lê Văn Phan, Cao Thị Bích Phượng, Đồng Văn Hiếu, Lê Đình Quyền,Phạm Ngọc Thạch
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Vietnam Journal of Agricultural Science
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Reverse transcription - polymerase chain reaction (RT-PCR) and sequencing methods were used to identify porcine deltacoronavirus (PDCoV) in eighteen fecal and intestine samples of diarrhae piglets in four farms in Thai Binh and Hanoi in 2015. The diagnostic results showed that 1518 ( 83.33 % ) samples were possitive with PDCoV The nucleotide and deduced amino acid analysis based on the nucleocapsid (N) gene sequence indicated that nucleotide and aa sequences of PDCoVVN/TB1/2015 were homologous to Dong Nai isolate (VN-1215, isolated in 2015 ) at 99 % and 99.5 % , respectively . The phylogenetic analysis indicated that PDCoV / VN / TBI / 2015 and VN - 1215 strain were closely related to PDCoV isolates found in 2012 in Hongkong and in 2014 in China
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2
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Assessment of the Possibility White Spot Virus Infection from Red Fiddler (Uca sp.) to White Shrimp (Litopenaeus vannamei)
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Trương Thị Mỹ Hạnh,Huỳnh Thị Mỹ Lệ, Phạm Thế Việt, Phan Thị Vân
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Vietnam Journal of Agricultural Science
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White spot syndrome virus (WSSV), the causative agent of white spot syndrome in shrimp, has a wide host range including crabs, zooplankton (Copepods), molluscs, poultry and polychaete. Uca sp. is a common fiddler living in intertidal land, estuary and source water used for settling pond of shrimp farms in Nam Dinh, Nghe An and Quang Ninh. WSSV, an important viral pathogen of the shrimp, can replicate in crustacean species, therefore, it is a potential vector for virus transmission. The major aim of this study was to determine whether WSSV can be replicate on Uca sp and transmitted from Uca sp. to shrimp (Litopenaeus vannamei) through water environment. Uca sp. was infected with WSSV by injecting suspension containing WSSV in dilution 10 % on the second leg . Results showed that , wssv was detected in infected fiddler in experiment by PCR method after 107 hours of infection. WSSV was transmitted from Uca sp. to shrimp through water environment horizontally after 83 hours of exposure to Uca sp. carrying WSSV. Our findings support the contention that Uca sp. was a potential vector for virus transmission and can be a source of WSSV infection of culture shrimp.
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3
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Study on Rickettsia spp infection in dogs in Hanoi
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Nguyễn Thị Hồng Chiên, Vũ Đức Hạnh, Trần Hải Thanh, Nguyễn Thị Hằng,Đào Lê Anh, Bùi Khánh Linh
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Journal of Veterinary Science
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The study was conducted on 247 dogs raising in Ha Noi, Vietnam. The average prevalence of Rickettsia spp in dogs was 17.4%. Rickettsia spp were identified in all age stages of dogs, of which the infection rates was highest in dogs more than 2 years (21,33%) compared with that of less than 1 year dogs group (16,03%). The rate of Rickettsia spp infection in male dogs was 23.36% and 10% in female dogs. The hemoglobin concentration in infected dogs was lower than that in normal dogs and leucocyte profile was almost unchanged when blood physiological indicators were tested.
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4
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Determination of White Spot Virus in Live Food Used to Culture Broodstock Shrimp
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Phan Thị Vân, Phạm Thế Việt, Mai Thị Phương,Huỳnh Thị Mỹ Lệ,Trương Mỹ Hạnh
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Journal of Agriculture and Rural Development
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The study was conducted from March to December 2015 in 4 provinces including Ca Mau, Bac Lieu, Khanh Hoa and Nghe An, focusing on gathering information on the species as live food used for shrimp broodstocks in hatcheries and determining whether these live foods carried WSSV. The results showed that there were 13 species of live food types in 5 groups (crustaceans, cephalopoda, molluscs, polychaete and cattle) were used for feeding shrimp broodstocks in hatcheries. The number of live food species varied on locations which were highest in Bac Lieu (9 species), followed by Khanh Hoa (6 species), Ca Mau (5 species) and then in Nghe An (2 species). WSSV were only found in polychaete (Perinereis sp) with 32.07% of samples collected from shrimp hatcheries in Khanh Hoa.
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5
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Antibacterial effect of Polygonum chinense L. extract on pathogen bacteria of acute hepatopancreatic necrosis disease in brackish shrimps
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Trương Mỹ Hạnh, Phạm Thị Yến, Phạm Thị Huyền,Huỳnh Thị Mỹ Lệ,Phạm Thị Hồng Minh, Đỗ Tiến Lâm, Trần Thị Hoài Vân, Phan Thị Vân
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Vietnam Journal of Science and Technology
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The study was conducted from March to December 2015 in 4 provinces including Ca Mau, Bac Lieu, Khanh Hoa and Nghe An, focusing on gathering information on the species as live food used for shrimp broodstocks in hatcheries and determining whether these live foods carried WSSV. The results showed that there were 13 species of live food types in 5 groups (crustaceans, cephalopoda, molluscs, polychaete and cattle) were used for feeding shrimp broodstocks in hatcheries. The number of live food species varied on locations which were highest in Bac Lieu (9 species), followed by Khanh Hoa (6 species), Ca Mau (5 species) and then in Nghe An (2 species). WSSV were only found in polychaete (Perinereis sp) with 32.07% of samples collected from shrimp hatcheries in Khanh Hoa
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6
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Study on the infection of white spot virus (WSSV) in crayfish (Macrobrachium nipponense) and the ability to spread disease to white leg shrimp (Litopenaeus vannamei)
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Trương Mỹ Hạnh, Phạm Thế Việt, Phan Trọng Bình,Huỳnh Thị Mỹ Lệ,Phan Thị Vân
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Vietnam Journal of Technology
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The study was conducted to evaluate the bactericidal effect of Polygonum chinense L. on the bacterial strain (Vibrio parahaemolyticus) causing acute hepatopancreatic necrosis disease (AHPND) in shrimps. The trunks and leaves of P. chinense L. trees were extracted by soaking in ethanol. Methods applied included: Kirby-Bauer disk diffusion susceptibility testing and tests on shrimps by feeding with the diet of 25-30 g/100 kg of shrimps and soaking with the concentration of 25-30 g/m3. The results showed that crude extracts of P. chinense L. had anti-bacterial effects on V. parahaemolyticus with the inhibition zone diameter of 19.8-20.6 mm at the concentration of 66.7- 200 μg/disc. In addition, using crude extracts added to water at the ratio of 30 g/m3 at 2 times (when the pathogenesis at theV. parahaemolyticusbacteria density of 105-106 cfu/ml and after 24 h), the survival rate was 60% compared with the control group 0%, while the method of herbal supplements to foods (25-30 g/100 kg of shrimps) was not effective because shrimps could not catch bait. The result achieved is a scientiic basis for the development of herbal medicinal products to be effective in the prevention and treatment of AHPND towards biosafety and environmental friendliness
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7
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A molecular based study on the spatio-temporal dynamics of porcine circovirus genotype 2d (PCV2d) circulating in Vietnam
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Phạm Hồng Quân, Phạm Công Hoạt,Huỳnh Thị Mỹ Lệ
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Vietnam Journal of Agricultural Science
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This study aimed at providing up to date information on the molecular epidemiology of porcine circovirus type 2 (PCV2) circulating in Vietnam, which focussed on the spatio- temporal dynamics of a newly defined PCV2d genotype. The results revealed a presence of multiple genotypes/ clusters of PCV2, such as: 1A/1B, circulating recombinant form (CRF) of PCV2b, and PCV2d. In the northern- middle- southern Vietnam, it was observed a co-circulation of multiple genetic clusters of PCV2 at each sampling location, of the same period. All field strains of PCV2d circulating in Vietnam from 2004- 2017 were predicted to have the most common recent ancestor originated from China, however, they located at different branches of the PCV2d- phylogenetic tree
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Evaluating the implementation of new rural area construction criteria in Phu Xuyen district, Ha Noi city
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Hồ Thị Lam Trà, Phạm Anh Tuấn, Đỗ Thành Công
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Journal of Agriculture and Rural Development
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The study analyzed the nature of rural areas in Phu Xuyen District in response to “National Program for Renewing Rural Areas’’. The research result showed that before the implementation of the Renewing Rural Areas, in average each commune only achived 4.77/19 criterias. After 3 year of implementaion, in average each commune has achived 11,89/19 criterias. In order to accelerate the implementation, these solutions need to be apply: propaganda promotion; production development; multi- components economic; enhance of community participation.
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8
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Actual registration of mortgaging land use right and assets attached to land in Thanh Oai district, Hanoi city.
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Phan Thị Thanh Huyền,Nguyễn Đăng Phùng
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Journal of Soil Science
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Land consolidation together with new rural contruction planning has resulted significantly in different places in Viet Nam. The research objectives are to assess the actual land consolidation from 2011 to 2014 with its results and to determine the effect on agricultural land use in Thanh Oai District. The results indicate that after land consolidation the numbers of agricultural land parcel decreased remarkablely from 6,86 to 2,71 land parcels per householder. Cropping pattern of agricultural land use, area of land use type (LUT), number of agricultural farms have changed towards increase of area of cash land use types being suitable for the need of urban. Therefore, The land consolidation contributed significantly on the change of agricultural land use towards efficiency being more suitable for urbanization.
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9
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Applying Geographic Information System (Gis) in Building Land Mapping Unit, Land Evaluation in Quang Yen Town, Quang Ninh Province
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Nguyễn Thị Hải, Vũ Thị Quỳnh Nga,Phạm Văn Vân
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Journal of Science and Forestry Technology
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The study area was conducted in the town of Quang Yen, Quang Ninh province and investigation study area is approximately 19763,97 ha in oder to construct a land unit map for land evaluation. Five classification criteria were identified including soil type, salinity, slope, texture, irrigation using GIS for building thematic maps and overlay thematic maps to construct land mapping unit. The results showed that there were 47 land mapping units (LMU), among which LMU number 6 had the smallest area 2,37 ha while LMU number 8 had the largest area 6392.40 ha. The results indentified 8 land ultilization typyes such as: land for rice, land 2 rice 1 cash crop, 1 land rice 1 cash crop, rice fish shrimp rice, land for cash crop, shortterm industrial trees, fruit trees and perennial plants, aquaculture, and forest
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10
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Criteria for sustainable employment and some difficulties in application in rural areas of Vietnam
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Lê Thị Xuân
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Journal of Economic Research
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Creating decent work is an issue that attracts the attention of many organizations and researchers around the world towards the sustainable development of society. A set of criteria for evaluating sustainable jobs created by International Labor Organization (ILO) is currently being used as a useful tool in assessing the sustainability of employment in many countries around the world. Starting from a review of the ILO's decent work criterias, through a literature review, analysis, and synthesis of information, the paper focuses on identifying constraints and gaps in the application of these criterias in Vietnam in general and in rural areas in particular, both in terms of group of macro criteria and group of quality criteria of employment. The paper aims to affirm that the development, modification and improvement of a toolkit for decent work assessment in Viet Nam is essential and meaningful.
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11
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The transformation of some functions of the family in the process of industrialization and modernization in Vietnam today
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Hà Thị Yến
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Journal of Education and Agonistic
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The article analyzing the process of industrialization and modernization in Vietnam has changed the functions of the family: reproductive function; the economic function of the family; educational function of the family; psychological, emotional function... Those functions are changing in positive way, and at the same time there are changes the negative trend.
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12
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Impact from using social network to the student learning
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Phạm Thị Thu Hà, Nguyễn Thị Thu Hà, Trần Thanh Hương, Trần Linh Chi
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Journal of Social Science Man Power
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This paper focuses overview of the reality and analyses the correlation among the frequency of using Social network and the studyresults of studenDr. Research results show that student who take part in Social networks using social network for many different purposes, but mainly to serve the purpose ofentertainment, communication and search the information more than the study. Thus, Social networks have a strong impact on the behavior, attitudes at home as well as at school of studenDr.
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13
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Strategic determinants of agricultural land use among rural households in the Red River Delta Region
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Nguyễn Thị Diễn
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Journal of Sociology
Journal of Social Study
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The paper analyzes the determinants of farm land use strategy and the policy implications of agricultural restructuring in Vietnam today.
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14
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Professional and professional business
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Dr. Lê Thị Lý
MSc. Hoàng Thị Thanh
MSc. Ngô Thị Mai
MSC. Trương Thị Thu Hạnh
MSc. Nguyễn Thị Hiền
MSc. Lê Thị Thảo
MSc. Trần Thị Thu Huyền
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The article deals with the relationship between professional ethics and economic interests in history and the present. On the basis of the Marxist theory of economic interest is a determinant of morality - a form of social consciousness. In the present time, when the economic benefits tend to override ethical values, the promotion of professional ethics through the expression of the preservation of prestige in business production, medical ethics and education is the basis for growth.
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15
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Vocational training for rural workers in Vietnam: Some theoretical and practical issues
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Dr. Lê Văn Hùng
MSc. Nguyễn Thị Thanh Minh
MSc. Nguyễn Thị Thanh Hòa
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Journal of Science and Political Theories
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The paper analyzes vocational training for rural workers in Vietnam. Include the Party's and State's views and policies on vocational training; results and limitations in vocational training for rural workers; Causes of limitation and some solutions to improve the effectiveness of vocational training for rural workers.
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16
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Traditional family culture with the construction of family culture in Vietnam today
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Dr. Lê Văn Hùng
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Journal of Culture, Sports, and Tourism
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The article analyzes traditional family culture with outstanding values such as loyalty, harmony, love in a marriage relationship; filial piety of children with parents; the help of brothers and sisters in the family ... These cultural values are contributing to build the family in Vietnam today in the direction of prosperity, equality, progress, and happiness.
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17
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The behavior culture of students to lectures in the current higher education environment
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Nguyễn Thị Minh Nguyệt
Dr. Lê Văn Hùng
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Journal of Educational Theories
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Higher education is also being affected the negative side of the market economy. In particular, the phenomenon of commercialization in education is also wading into school, staff, lecture and studenDr. As few culture normative values adjusting the relationship between lecture and students are redefined by benefit, the phenomenon of buying and selling score is no longer a particular phenomenon in the education environment. These phenomenon have set the tone for the a larm bell about reasons of the education environment in general, higher education in particular. Therefore, want to build school culture first must build the relationship between students and lecture, is the foundation for the development of student personality, help them not only have "talent" but also "morality" as the president of Ho Chi Minh.
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18
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Global address address with the security protection of the family family of the family family
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Đỗ Thị Kim Hương, Lê Thị Yến, Nguyễn Thị Minh Hạnh
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Journal of Education and Society
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In the legal science forum, there is a great deal of debate on intellectual property and farmer rights, most of which recognizes that access to intellectual property rights in the agricultural sector of farmers there are many restrictions. Geographical indications, however, are the specific subject of intellectual property rights that allow farmers to develop their strengths in traditional agricultural products and protect their brands in the domestic market. international. In this paper, we analyze and point out the suitability of geographical indications for traditional agricultural products, thereby suggesting solutions to promote the strengths of Vietnamese agricultural products through just geographic
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19
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Buddha Tran Nhan Tong and Culture of Dai Viet - Champa
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Tạ Quang Giảng,Đinh Đức Tiến
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Journal of Culture and Arts
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The article deals with the role of Tran Nhan Tong in the history of the Tran dynasty (13th - 14th centuries) in particular and Vietnam in general. In particular, it emphasized the role, influence and manner of Tran's behavior towards the Champa issue. During the reign of Dai Viet he brought the relationship between the two kingdoms to the pinnacle of intimacy. In 1306, the marriage between Princess Huyen Tran and Che Man - the king of Champa (Jaya Simhavarman III) did not only show the good relationship, but also brought to Dai Viet the equivalent of Quang Tri - Thua Thien Hue province. From here, Đai Viet not only received elements of Chinese culture, but also received the values of Champa culture that created Dai Viet culture with its own values ( non-Chinese, non-Indian)
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20
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Farmers' capability and the need for occupational training for farmers at Van Giang district, Hung Yen province
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Trần Thị Hà Nghĩa, Lê Thị Kim Thư, Bùi Thị Hải Yến
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Journal of Social Psychology
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With the purpose of indentifying the need for agricultural occupational training for farmers at Van Giang district in order to design a suitable training program for local farmers, we studuied farmers' opinion of farming and castle breeding. The finding showed that there was a significant need of short-term training for both farming and castle-breeding jobs.
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Using vocabulary notebooks in learning English at Vietnam Academy of Agricultural.
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Phạm Hương Lan
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Journal of Education and Society
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Vocabulary is important in any language, so learning vocabulary plays a big role in mastering a language in general and English in particular. Effective vocabulary learning will bring learners a rich, deep, and broad vocabualry, making it easier for learners to acquire different knowledge about the language they are learning. Vocabulary is the key to communicating a language. To learn the vocabulary most effectively, learners need to utilize a variety of learning strategies, including the use of vocabulary notebooks. This is widely used in learning foreign languages. The results of the research have confirmed that the use of notebooks has a positive effect on learning vocabulary and learners are more motivated and find effective in learning individual vocabulary.
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Basic modality in English and Vietnamese in perpective or force dynamics
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Nguyễn Thị Thu Thủy
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Journal of Education and Society
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Modality in English has beenresearched repeatedly, but the normal Vietnamese and English modality is still new. The author explains the issue under the influence of cognitive theory to analyze and contrast modality of obligation, permission, ability, volition. Such modalities are formed in the relation of the equivalent forces like compulsion, blockage, counterforce, removal of restraint, enablement. The author also points out the similarities and differences between the two languages and suggests some recommendation for the issue.
Key words: Basic English modality, cognition, forces, Vietnam
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21
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Forms of encouraging students to learn English in teaching English at the Vietnam National University of Agriculture: Current situation and proposing solutions
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MSc. Trần Thị Hải, MSc. Vũ Thị Hương, Nguyễn Thị Hoài
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Journal of Teaching and Learning Today
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The fact that so many students are not interested in English lessons, although they determine this is a very important subject. The question rises here as how to increase motivation to learn English in the classroom and help students achieve better results. In order to answer this question, the article analyzes the use of the ways of encouragement; find out the reaction of students and the relationship between the form of encouragement and academic performance of students by qualitative and quantitative method with SPSS software. From the situation above, the article proposes some solutions to attract students to learn English which contribute to improve the quality of student training at Vietnam National University of Agriculture.
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22
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Assessing and evaluating students' academic results in an application-oriented training program (POHE).
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Nguyễn Công Ước, Nguyễn Tất Thắng, Bùi Thị Hải Yến, Trần Thúy Lan
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Journal of Teaching Equipment
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POHE program - a modern training program is expanded to enhance students’ professional competence to meet the needs of employers. Therefore, this study was conducted to show the current testing and assessment forms and to provide some suggestions. The instruments used to find out answers for this issues was a questionnaire on a sample survey of 200 first-year students and 40 lecturers of POHE program at Vietnam National University of Agriculture. Based on the results, this study briefly drew the following conclusions: the actual assessment criteria, basis for selection of the evaluation forms, the level of response of the evaluation form to study and career requirements, advantages and disadvantages in the assessment and effective measures to improve students’ learning outcomes of this program.
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23
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A case study on successful English learner at VNUA
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Phạm Hương Lan,Ngô Thị Thanh Tâm
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Journal of Teaching and Learning Today
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It is widely recognized that the more thoroughly instructors understand some certain characteristics of their students, the better chance they have of supporting their students’ learning. This study aims to identify the factors that make successful language learners in the learning context in Viet Nam National University of Agriculture. Based on a case study on a successful English learner of Advanced Program at VNUA, the research reached a conclusion that motivation, learning styles, intelligences (learner strengths) and learning conditions are the crucial factors influencing considerably on students’ learning results, in which motivation is considered a key one in deciding the success of the learner, and other factors are highly supportive elements. This results suggest that teachers should take into their consideration the match between teaching styles and learning styles so that the learners can be best motivated in their learning.
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24
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Communication skills of students at the faculty of education and foreign languages, Vietnam National University of Agriculture.
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Đặng Thị Vân
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Journal of Social Psychology
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A survey of 102 students at the Faculty of Education and foreign languages at Vietnam National University of Agriculture found that of the communication skills studied, students could perform certain skills well, such as relationship establishments skill and listening skill. Skills that students need to sharpen were persuasion skill, communication control skill, and expression skill. As communication skill are the fundamental skills for their future career, students need to master these skills as quickly as possible.
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25
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Enhancing students’ awareness of environmental protection at Vietnam national university of agriculture
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Đặng Thị Vân
Vi Thị Thời
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Journal of Social Psychology
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A study of predictors of students' awareness of environmental protection inside the Vietnam National University of Agriculture with a sample of 150 students found that subjective factors played the fundamental role, especially students' unawareness of the importance of environmental protection. Many students refuse to protect the environment due to negative impacts from friends and other people. Through an experiment, the authors found that students' awareness of environmental protection could be improved through advices and actual behaviors.
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26
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Discussing the teaching method of soft skills effectively
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Trần Thị Hà Nghĩa
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Journal of Teaching and Learning Today
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In the present stage, teaching soft skills for students in schools is very necessary. It helps students to have good relationships, and solve the situation properly in social life. Therefore, mastering soft skills requires students to apply the knowledge in schools and in practice that they have experienced.
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27
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Teaching English in the mind map method for students of Viet Nam National University of Agriculture
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Hà Thị Lan
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Journal of Education and Society
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Mastering the meaning of vocabulary is always one of the ultimate goals of the foreign language user, from
beginner to expert, because it can help users use the language effectively. Towards enhancing the teaching
vocabulary for students in the mind map at Vietnam National University of Agriculture, the writer explored the effectiveness of mind map teaching method and gave some suggestions to improve the efficiency of teaching the foreign language in the institution.
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28
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Combined instruction - advantages and disadvantages
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Nguyễn Thị Kim Quế
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Journal of Education and Society
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The blended learning model is recognized as one of the potential future directions for teaching. The application of this model demonstrates many advantages, such as proactive learning time for learners, personalization of learning programs, increased responsibility for process participants, and enhancement of critical thinking. However, combined teaching has its disadvantages. In order to be able to apply good teaching combination, it requires a technology foundation and an in-depth teacher training process for high quality teaching needs.
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29
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FRIT for cascade controller tuning.
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Nguyễn Thị Hiên
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Journal of Rural Industry
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The paper presents an optimization algorithm that directly uses data to simultaneously tune parameters of the controllers in cascade control systems. Algorithm does not require any parameters of the plan, but requires only one set of experimental data of the closed system. Algorithm was validated by simulation using Matlab software, the results showed that the algorithm is effective, even if with disturbance.
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30
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Design and manufacture Designing some of parts tillers NPK fertilizer tablets machine for industrial plants
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Lê Vũ Quân, Lưu Văn Chiến
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Journal of Agriculture and Rural Development
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The tablets fertilizer for crops that are increasingly present superiority in many aspects compared to Vietnam method traditional scatter fertilizer that is suppressing weeds, insects ... especially that reduce fertilizer costs increase crop yields. Separate tablets are manufactured from inorganic fertilizers into the soil as fertilizer concentration plant roots live, is a new product in Vietnam has many advantages such as reducing agricultural runoff integral volatile, improve the efficiency of fertilizer use up twice with traditional scatter fertilizer and crop yield increases. Currently, fertilizer tablets were applied in many provinces in the country but the fertilizer plant operations staff is not stable and have high efficiency.
From these requests, we have gone into the design, manufacturing NPK fertilizer pellets for industrial plants to ensure quality fertilizer and low cost.
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31
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Design of A Wireless Air Temperature and Humidity Monitoring System
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Nguyễn Kim Dung
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Vietnam Journal of Agricultural Science
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The paper presents a wireless monitoring system of environmental parameters. In this context, we proposed a wireless air temperature and humidity monitoring system which is low-cost and easy for Vietnamese to use. The system consists of a 8-bit chip micro professional ATmega8 as a core control of system, wireless transceiver module nRF24L01, temperature and humidity sensor DHT11. Interface monitoring software was designed by Visual Studio. To assess the accuracy of the measuring equipment, thermometer and hygrometer DC107 was employed for standard. The air temperature and humidity data at wireless monitoring system are highly comparable to those at DC107. Energy saving solutions for remote equipment also is mentioned in this study.
Keywords: Temperature and humidity monitoring, wireless sensors, DHT11, nRF24L01 module, ATmega8.
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32
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Research And Identify Properties with Diesel Engine 3t84 Axis Communications Through Experimental Capacity
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Đặng Tiến Hòa
Bùi Việt Đức
Đặng Đức Thuận
Phạm Trọng Phước
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Journal of Construction Technology Science
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The 3T84 diesel engine on the YANMAR 3000 is widely used in agroforestry work, especially in conjunction with cultivators such as plowing, milling, grading and handling. Most of these machines are used and imported from Japan so the specification of the motor specifications is hardly available, which is very difficult to design, you. The content of this article reflects the results of the 3T84 non-engineered specification study using the power extraction shaft on the self-designed hydrostatic test band. The result of the study is the database for calculating the design of tractors combined with hydraulic transmission.
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33
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Hydraulic system automatically controls cutting height on the small combine harvester
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Bùi Hải Triều, Bùi Việt Đức, Nguyễn Trọng Minh
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Journal of Rural Industry
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This article announces the results of initial research to develop system automatically controls blade’s height in the rice harvest small machine made in Viet Nam. The system is designed on the basis of choice and connect the standard hydraulic control elements on market. Simulation results character of operations and control the ability of the system to meet the requirements of the basic movements such as changing cutters to cut the desired part of the operator, especially auto cutting height control on the nature of the surface is not flat in field. The system can be applied in the rice harvest small machine with a reasonable cost.
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34
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Bending analysis of functionally graded cylindrical shell panel under mechanical load and thermal effect - Analytical solution and Finite element method
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Trần Hữu Quốc,Dương Thành Huân, Trần Minh Tú và Nghiêm Hà Tân
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Journal of Construction Technology Science
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In this paper, the analytical solution, and the nine-noded isoperimetric quadratic element of finite element model based on the first-order shear deformation shell theory are presented for bending analysis of functionally graded cylindrical shell panel under mechanical load and thermal effect. Functionally graded materials (FGM) are made from a mixture of ceramics and metals. Poisson’s ratio is assumed to be constant, but their Young’s moduli varies continuously in the thickness direction according to a simple power law distribution in terms of the volume fraction of constituents. The accuracy of the formulations is validated by comparing the results with those available in the literature. The effects of material composition, geometric properties, and boundary conditions on the deflection of cylindrical panel are studied.
Keywords: Functionally graded materials, cylindrical shell panel, bending analysis, FSDT, FEM, thermal environment.
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35
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Analytical solutions for bending, buckling and vibration analysis of functionally graded cylindrical panel
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Dương Thành Huân, Trần Minh Tú và Trần Hữu Quốc
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Vietnam Journal of Science and Technology
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he main purpose of this article is to present analytical solutions for bending, buckling and
free vibration analysis of cylindrical panel, which are composed of functionally graded materials
(FGMs). Equations of motion are derived using Hamilton’s principle. The first-order shear
deformation theory is used for developing Navier’s solutions of simply supported cylindrical
panel. Comparison studies are presented to verify the validity of present solution. It is found that
the presented results are close to those existing. The effect of volume fraction distributions,
panel aspect ratio, and side-to-thickness ratio on the deflections, buckling loads and natural
frequencies is also investigated.
Keywords: functionally graded cylindrical shell, shear deformation theory, bending, buckling,
vibration.
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36
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Free vibration analysis of functionally graded doubly - curved shallow shells including thermal effect
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Duong Thanh Huan, Tran Huu Quoc, Tran Minh Tu, andLe Minh Lu
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Vietnam Journal of Agricultural Science
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In this paper, theoretical formulation, Navier’s solutions, and finite element models based on the first-order shear deformation shell theory are presented for the free vibration analysis of functionally graded doubly-curved shallow shell panels including thermal effects. The temperature field is considered uniform distribution over the shell surface and varied in the thickness direction only. Material properties are assumed to be temperature-dependent, and graded in the thickness direction according to a simple power law distribution in terms of the volume fractions of the constituents. All four edges of the shell panels are assumed to be simply supported. Comparisons reveal that the numerical results obtained from the proposed method agree well with those available in the literature. The effects of side-to-thickness ratio (a/h), temperature fields (Tc) and volume fraction distribution (p) on the natural frequencies of the functionally graded doubly-curved shallow shell panels are also investigated in the present study.
Keywords: Functionally graded materials (FGM), free vibration analysis, FSDT, FEM, thermal environment, doubly-curved shells.
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37
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Simulation Study of the effect of nanocrystal size on electron beam induced current collected by nano-contact
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Đoàn Quảng Trị, Vũ Ngọc Phan, Dương Xuân Núi, Dương Chính Cương,Nguyễn Văn Đạt
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Journal of Science and Technology
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Using the Monte-Carlo simulation to study the effect of size nanocrystals (NCs) deposited randomly at the sample surface and considered as the center recombination. The electron beam induced current is collected by a nano-contact. Results are show that the electron beam induced current decrease when size of NCs augments as an exponential function. From the profiles of the electron beam induced current, the minority carrier diffusion length is extracted. The effect of NCs size on the minority carrier diffusion length is studied and the results show that the minority career diffusion length decrease with increasing of NCs size. This is explained because of the increasing the zone of recombination at the sample surface.
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38
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Some research results of experimental about sieve of soybean thresher
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Nguyễn Xuân Thiết
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Vietnam Journal of Mechanics
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In this paper, theoretical formulation, Navier’s solutions, and finite element models based on the first-order shear deformation shell theory are presented for the free vibration analysis of functionally graded doubly-curved shallow shell panels including thermal effects. The temperature field is considered uniform distribution over the shell surface and varied in the thickness direction only. Material properties are assumed to be temperature-dependent, and graded in the thickness direction according to a simple power law distribution in terms of the volume fractions of the constituents. All four edges of the shell panels are assumed to be simply supported. Comparisons reveal that the numerical results obtained from the proposed method agree well with those available in the literature. The effects of side-to-thickness ratio (a/h), temperature fields (Tc) and volume fraction distribution (p) on the natural frequencies of the functionally graded doubly-curved shallow shell panels are also investigated in the present study.
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39
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Establishment of a Mathematical Model
of Dry Straw Pressing Process in A Baler Erc-10
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Dr. Đỗ Minh Chiến
Assoc. Prof. Dr. Trần Như Khuyên
Dr. Nguyễn Khắc Thông
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Journal of Rural Industry
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Functionally graded materials (FGM), free vibration analysis, FSDT, FEM, thermal environment, doubly-curved shells.
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40
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Researching Technology and Processing of Livestock Vacuum Seeds Technology
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Dr. Lê Minh Lư, Assoc. Prof. Dr. Chu Văn Thiện
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Journal of Rural Industry
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This article introduces the results of the study on technology and technological process of rice-seed drying with intermediate incubation stage. From the results, the highest quality of rice- seeds with percentage of germination of 98% and vitality of 97% can be obtained with the condition that the rice-seeds were dried at temperature of 40oC and the velocity of drying factor was 0.24 m/s. With a drying technique including an intermediate incubation stage, the rice-seeds having initial humidity of 25% are dried at the first stage of 40oC to the humidity of 18%. Then, the rice-seeds are incubated (the supply of temperature and air is stopped) during 4 hours. After that, they are dried at the second stage of 42oC to the humidity of 13%. This is the best condition for highest quality of rice-seeds as well as the drying time and the specific energy costs are reduced by 10%.
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41
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The Results of a Calculation and Design The Classification of Corn An Industrial Scale With Capacity Of 45-50 Ton/H
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Assoc. Prof. Dr. Nguyễn Đình Tùng(1),Dr. Lê Minh Lư
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Journal of Rural Industry
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The paper content presents the results of calculation and design the classification of corn in commercial maize production line an industrial scale. The main parameters are found out as follows: the diameter is 0.8m; the working length is 7.5m; the number of revolutions is between from 5 to 20 rpm; the working angle of incline is about 70 and the productivity is about 45- 50 ton/h. In addition, investigation of the stability, strength of the machine through a model-based diagnostic algorithm on structural analysis by computer.
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42
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Research Results Of Dynamics For The Straw Chopping Part
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Dr. Lê Minh Lư
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Journal of Rural Industry
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A study on the straw-cutting part (CTR-1) combined with the threshing machine to utilized efficiently the post-harvest straw was conducted at Faculty of Engineering, Vietnam National University of Agriculture. Some research results, such as selection of new cutting principles and development of a mathematical model that determines the degree of influence of key parameters on the target functions, were presented in related works. In this study, the author introduces some results of studying on the dynamics of driven systems for the straw-cutting part combined with the threshing machine. The results of this study are the basis for selecting the inertial moment and the rotational speed of the straw-cutting part in order to open the machine more easily and to avoid the phenomenon of resonance when the straw-cutting part combined with the threshing machine.
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43
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Determination of Optimal Parameters of Cow Feed Chopper Tc-5.0
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MSc.. Cao Đăng Đáng
Assoc. Prof.Dr. Trần Như Khuyên
DR. Phạm Thị Minh Huệ
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Journal of Science and Technology
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The TC-5.0 grass cutter machine is one of the main machines used in the cow raw food production line. This machine uses disks for cutting, feeding and collecting products with the productivity at 5.0 tons/h. The results of multistage empirical research and general optimal research basing on the Harrington EC method have determined the optimal values of input factors: rotational speed of knife n = 550 rpm, material layer thickness a = 6,0cm, feed rate v = 0,41m/s and optimal value of output parameters: uniformity of the segment δ = 91,6% and power cost Nr = 2,7kWh/ton.
Keywords: Circular saw blades,mechanized, optimal, multistage
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44
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Combined With Threshing Machines
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Lương Thị Minh Châu
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Vietnam Journal of Agricultural Science
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The aim of the paper is to research the optimal parameters of a vertical cone-shaped screw mixer with grass in experiment planning method. With this objective, the main contents are going into determining the specifications of grass vertical cone-shaped screw mixer used to mix roughage and concentrate to produce animal feed for cattle daily or to long-time preservation of anaerobic fermentation methods. Determining the parameters influence by theory and an element experimental to economic indicators and technical indicators. Laboratory layout determines the influence of these factors and building the regression equations for mixing uniformity equation and specific energy consumption equation during mixing. Researching the effect of various parameters on economic - techniques indicators by experimental planning methodology extremes. Thereby, determining regime works the optimum of the grass vertical cone-shaped screw mixer.
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45
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Simulation Study of the effect of nanocrystal size on electron beam induced current collected by nano-contact
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Đoàn Quảng Trị, Vũ Ngọc Phan, Dương Xuân Núi, Dương Chính Cương,Nguyễn Văn Đạt
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Journal of Science and Technology
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Using the Monte-Carlo simulation to study the effect of size nanocrystals (NCs) deposited randomly at the sample surface and considered as the center recombination. The electron beam induced current is collected by a nano-contact. Results are show that the electron beam induced current decrease when size of NCs augments as an exponential function. From the profiles of the electron beam induced current, the minority carrier diffusion length is extracted. The effect of NCs size on the minority carrier diffusion length is studied and the results show that the minority carrer diffusion length decrease with increasing of NCs size. This is explained because of the increasing the zone of recombination at the sample surface.
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46
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Study on design of corn dryer type screw powered by synthesis gas deducted from burning agricultural residues
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Trần Như Khuyên; Tạ Hồng Phong;Nguyễn Thanh Hải; Nguyễn Khắc thông
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Vietnam Journal of Agricultural Science
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The corn dryer powered by gas deducted from burning agricultural residues SN – 1.0 has been designed and manufactured at Department of Food engineering, Vietnam National University of Agriculture. It is designed according to new principle using screw that placed vertically in drying bin to allow cyclic motion of drying materials inside the drying bin.
Experiment have been conducted to determine effects of temperature and flow of drying airflow, velocity of screw to the dryness, drying time and fuel cost. Experimental result shows that materials dryness increases thanks to continuous stirring of materials during drying process, allowing moisture from center of corn seed can easily diffuse to the surface and vaporize. The capability of removal moisture is increased contributing to reduce drying time as well as fuel cost.
Key words: Synthesis gas, specific fuel consumption
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47
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Study on design of corn dryer type screw powered by synthesis gas deducted from burning agricultural residues
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Trần Như Khuyên, Tạ Hồng Phong,Nguyễn Thanh Hải,Nguyễn Khắc Thông
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Vietnam Journal of Agricultural Science
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The corn dryer powered by gas deducted from burning agricultural residues SN – 1.0 has been designed and manufactured at Department of Food engineering, Vietnam National University of Agriculture. It is designed according to new principle using screw that placed vertically in drying bin to allow cyclic motion of drying materials inside the drying bin.
Experiment have been conducted to determine effects of temperature and flow of drying airflow, velocity of screw to the dryness, drying time and fuel cost. Experimental result shows that materials dryness increases thanks to continuous stirring of materials during drying process, allowing moisture from center of corn seed can easily diffuse to the surface and vaporize. The capability of removal moisture is increased contributing to reduce drying time as well as fuel cost.
Key words: Synthesis gas, specific fuel consumption
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48
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Study, design of a Stand –Alone photovoltaic mini model
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Đào Xuân Tiến, Nguyễn Xuân Trường,Nguyễn Quang Huy
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Journal of Rural Industry
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Photovoltaic energy is one of the renewable energy, which can supplement or replace the fossil energy sources become exhausting currently. However, exploiting and applying of solar energy in the rural scope, agricultural production still has many limitations such as in the developing country, for example Vietnam. The expensive investment of the systems, the import of the equipment and the lack of the solutions from the government are the important reasons for this limitation. To solve a technical part of the solar energy system, we concentrate to study on a Stand –Alone photovoltaic model, and introduce a calculation method of the solar power system by average power consumption. In addition, also this paper, we design the electrical converters to supply the electricity for some remarkable sub - loads. The experiment results show that the system operates stably following the demand of the given sub-load.
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