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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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Selection of Porcine Circovirus Type 2 (PCV2) Isolates for Development of Vaccine against Postweaning Multisystemic Wasting Syndrome
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Huỳnh Thị Mỹ Lệ, Lê Văn Phan, Nguyễn Văn Giáp, Trịnh Đình Thâu
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Journal of Science and Development, Volume 13, issue 3, pp. 406 -415
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This study aimed to build up a collection of field isolates of Porcine circovirus type 2 (PCV2) circulating in pigs of Viet Nam. This is the first study for development of vaccine against post-weaning multi-systemic wasting syndrome, one of the most important Porcine circovirus type 2-associated diseases. Seven isolates of PCV2 were selected as candidates for subsequent evaluations. The purity test showed that 100% of PCV2 isolates were free of CSFV, PRRSV, PPV, PEDV, TGEV, PRV, FAdV and Mycoplasma. However, there were two out of seven isolates were contaminated with PCV1, and thus were not eligible for the production of master seed. The titers of five pure PCV2 isolates were in the range from 102.00 TCID50/ 0.1 ml to 105.75 TCID50/ 0.1 ml, of which the titers of three isolates were higher than 105.00 TCID50/ 0.1 ml.
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2
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The molecular epidemiology of Porcine circovirus type 2 (PCV2) circulating in Northern of Vietnam in 2013 and 2014
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Huỳnh Thị Mỹ Lệ, Lê Văn Phan, Nguyễn Văn Giáp, Nguyễn Bá Hiên, Trịnh Đình Thâu
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Journal of Veterinary Science and Technology, Vol. XXII, issue 7, pp. 19-27
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This study was aimed to evaluate the immunogenicity of several isolates of porcine circovirus type 2 (PCV2) which are candidates for master seed selection. The experiments were done with 3 isolates having titer ≥ 105 TCID50/ 0,1ml (namely isolate number 03, 04, and 07). All of immunized rabbits were able to produce specific antibodies against PCV2 which appeared around 14 days post immunization, and prolonged at least 56 days. Rabbits immunized by PCV2 of different passaging levels elicited humoral immune responses in similar manner as well as the viral neutralizing properties
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3
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Evaluation of land allocation and land lease in Hong Linh town, Ha Tinh province
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Phan Thị Thanh Huyền, Phan Đình Binh
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Journal of Science and Technology, University of Thái Nguyên
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Hong Linh town located in the northern of Ha Tinh province, far from Vinh City 15 km to the south and 35 km to the north with the total natural area in 2014 was 5.855,23 hectares. Results of assessment of the land recovery, land allocation and land lease in the period of 2004 - 2013 on the town showed that the land allocation and lease land for organizations, households and individuals are made regularly. Of which, there are 1.326 land allocated cases with an area 384.142,5 square meters and 83 land leased cases with an area of 1.957.685,13 square meters. To improve the efficiency of land recovery, land allocation and land lease in Hong Linh town, it is necessary to conduct the synchronous solutions as follows: improving law awareness land managers as well as people use the land; investing capital for land recovery; strengthening land allocation and land lease forms by land auction to improve local budgets; strengthening inspection and supervision for the land use of organizations after being allocated or leased.
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4
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Evaluation of compensation, support and resettlement for Yen Binh I Industrial Park in Pho Yen district, Thai Nguyen province.
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Phan Thị Thanh Huyền
Nguyễn Mạnh Cường
Nguyễn Tiến Sỹ
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Journal of Soil Science, vol. 45
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No1 Yen Binh Industrial Zone is built on an area of 92,7 hectares. The implementation of the policy of compensation, support and resettlement of project is conducted in accordance with the order and procedures and ensure compliance with legal provisions. Total budget of projects is 440.809.213,02 thousand. Of which, the amount of compensation is 301,876,147.2 thousand; amount of support is 138,933,065.82 thousand; total number of households resettled is 446 households. The proposed solutions for ground clearance in Pho Yen district include: completing of land registration, certificate of land use rights, ownership housing and other assets attached to land; strengthening the role of the community in the compensation, support and resettlement; improving staff capacity and working efficiency of the Compensation Committee.
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5
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Assessment of Implementing Compensation, Support and Resettlement in the Course of Land Acquisition for Infrastructure Projects in Van Don District, Quang Ninh Province
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Đặng Tiến Sĩ, Phạm Thị Tuyền, Đặng Hùng Võ, Đỗ Thị Tám
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Journal of Science and Development, vol. 13, issue 1, pp.82-89
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This study aimed to investigate the current performance in compensation, supports and resettlement in Van Don District. Data collection, survey, synthesis and comparative method were used to evaluate the compensation, supports and resettlement of 2 key projects in Van Don District. Most of the land owners agreed that the compensation, supports and resettlement have been implemented on time and complied with the laws. However, there were some limitations related to compensation (compensation price lower than market value; payment by cash). Proposed solutions for these problems are Improving the capacity of institution in managing land, especially, in terms of land registry; compensation policy diversification; long-term aids and employment policies.
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6
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Assessment on the implementation of Criteria for Renewing Rural Areas in Xuan Truong community, Tho Xuan district, Thanh Hoa province
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Đỗ Đình Hiệu Đỗ Thị Tám
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Journal of Soil Science, vol. 45 (2014), issue 128-133
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The study analysed the nature of rural areas of Xuan Truong community in response to “A Set of National Criteria for Renewing Rural Areas” and “Tam nong” policy. The data were gathered from 100 households and from local office. The research result showed that before the implementation of the Renewing Rural Areas, Xuan Truong community only archived 7/19 criteria. After 3 year of implementation, it has archived 16/19 criteria, and has not archived 3 criteria (irrigation, cultural facilities and culture). The citizens were quite satisfied with the result of the implementation of Renewing Rural Areas (mean is 3.86). In order to accelerate the implementation, these solutions need to be apply: propaganda promotion; infrastructure development; production development; multi-components economic development; advanced training of human resources; Renewing Rural Areas associated with natural resources protection.
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7
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Integrating GIS and Multi-criteria evaluation (MCE) in determining suitable land for lychee at Son dong district – Bac Giang province.
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Lê Thị Giang
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Journal of Agriculture and Rural Development
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The study was conducted to integrate applications of GIS technology and methods for Multi-Criteria Evaluation (MCE) to identify areas suitable for lychee trees. Weighting of each criterion is determined by the AHP method and then calculating the suitable level of the criteria by expert method. GIS is applied for building suitable maps for lychee trees by using overlay function. The integration of GIS and multi-criteria evaluation has found the weight of the target slope, soil type, soil depth, texture and irrigation for lychee trees respectively 0.26; 0.13; 0.48; 0.05; 0.08, then find suitable land to levels that are suitable (S1), the appropriate medium (S2), less suitable (S3) and not suitable (N) for lychee trees Son Dong district, Bac Giang province respectively 2074.14; 8247.96; 5308.62; 57936.71 ha.
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8
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Effects of Mixing Ratios of Straw Compost and Alluvial Soil on Yield of Potted Cucumber
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Nguyễn Văn Thao, Nguyễn Thị Lan Anh, Vũ Thị Xuân, Nguyễn Thu Hà, Đỗ Nguyên Hải
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Journal of Agriculture and Rural Development, issue 270, term 1, August 2015, pp. 49-56
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This research is carried out to evaluate the effects of ratios straw compost and alluvial soils on growth, productivity and quality of cucumber grown in pots. Agro-chemistry characteristics of materials such as pH, EC (mS), N (%), P2O5 (%), K2O (%) were suitable for cucumber growth. Obtained results show that harvesting period was generally ranged from 30 to 39 days, individual productivity collected fluctuate between 925 and 1543.7 (gram/tree). Concentrations of heavy metals (As, Cd, Pb), NO3- and number of E.Coli, Salmonella in fruits on original materials were in the allowable limits. When compared with other formulas, special formulas VL1 (100% alluvial soils) and VL6 (100% straw compost), formula VL5 (80% straw compost and 20% alluvial soils) had harvesting period was longer (39 days) with high individual productivity (1543.7 gram/tree), concentrations of NO3- in fruits are lower than VietGap standard. This suggests that the VL5 with 80% straw compost and 20% alluvial soils was most effective with cucumber in experimental conditions.
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9
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Measures to limit land claims and disputes at state-run agricultural and forestry farms
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Nguyễn Tiến Sỹ, Phan Thị Thanh Huyền
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Journal of Resources and Environment, issue 19, pp. 9-11
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From 2008 up to now, there were 129 complaints and land disputes related to the management and use of land of agricultural and forestry farms, of which: 81 cases belong the settlement powers of Minister Natural Resources and Environment; 47 cases belong the settlement powers of the locality. The content of land claims and disputes mainly focuses on the restoration of land which has been put on to the agricultural and forestry farms, the requirement to recognize land use rights for the contracted land and so on. In order to limit complaints and land disputes at state-run agricultural and forestry farms, the article also provided five specific solutions.
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10
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Assessing the settlement of complaints and denunciations on land in Ha Long City, Quang Ninh Province
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Hồ Thị Lam Trà, Phan Thị Thanh Huyền, Nguyễn Kim Cúc
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Journal of Soil Science, issue 46, pp. 113-118
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This study is aim at investigating the status of the transfer, mortgage and inheritance of land use rights for households and individuals in Gia Loc district, Hai Duong province. The study results showed that right transfers of the land users take place frequently with 1,859 of transfers, 5.408 mortgages and 330 inheritances in the period of 2009 - 2013. The proposed solutions for these problems are completing land registration system, building a database of land information; propagandizing land policies and laws; perfecting management mechanism, order and administrative for the rights of land users.
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11
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Evaluation of agricultural land use efficiency in Bac Yen district, Son La province
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Đỗ Nguyên Hải (QL), Phan Thị Thanh Huyền (QL), Vũ Xuân Trường
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Journal of Agriculture and Rural Development, issue 14, pp. 27 - 33.
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Bac Yen is a mountainous district of Son La province with a total area of 110, 371 ha, in which 80% of the slope above 250. There are four land use types with 19 land use utilizations, distributed in 02 different sub-regions. There are not significant differences in effectiveness of LUTs between 02 sub-regions, mainly achieve the level of medium and low. The research results show that LUT rice - Spring Upland crop gives economic efficiency and attracts the highest labor. The use of fertilizers for crops is limited, especially organic fertilizer made degraded soils and poor nutrition. The proposed solutions for increasing land use effectiveness of LUTs are completing the agricultural production planning; supporting crop varieties combined with searching market and consumption product; applying the farming practices on steep slopes; mobilizing farmers to use less herbicides and pesticides.
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12
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Impacts of Investment Projects on the Livelihood and Employment of Local People suffering Agricultural Land Acquisition in Chuong My District, Ha Noi City
Acquisition in Chuong My District, Ha Noi City
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Phạm Văn Vân
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Journal of Science and Development
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The impacts of investment projects on livelihoods and employment of local people suffering agricultural land acquisition and the challenges of the land acquisition in the socio-economic development are of hottest debate, both
in Vietnam in general and in Chuong My District in particular. The research results showed that from 2000-2010, 2,249 households were acquired of agricultural land with total area of 968.97 ha in the district. The land acquisition has contributed significantly to the change of economic structure: agriculture, forestry and fisheries sector
decreased to 22.00%, while industry and construction increased to 42.00% and trade and services increased to 36%
by 2010. However, the loss of agricultural land triggered some unexpected problems for some farmers, such as unemployment and social impact. Specifically, the change of jobs in some households suffering agricultural land acquisition for industrial clusters and parks was averagely only 16.5%. The results also indicated that the income of some local households was not changed, but some other households with less agricultural land acquisition got lower income comparison with previous period.
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13
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Law of Viet Nam on the right to take legal action in the interests of the environment and experience of the nations of the world
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Nguyễn Thị Minh Hạnh
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Journal of Environment
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Standing to sue in environmental public interest litigation has still been a new concept in Vietnam. The related legal matters are stipulated in the Decree No. 113/2010/ND-CP dated December 3, 2010 of the Government and mentioned in the Resolution No. 05/2012/ND-HDTP dated December 3, 2012 of the Judges' Council of the Supreme Court, in which the standing to sue is vested in the administrative bodies in accordance with the civil procedure. The paper finds out the conflicts and insufficiency of the law in both theoretical and practical perspectives if the standing to sue does not extend to other actors in the civil society (the concept of civil society is interpreted in broader sense that covers both people and social groups/organizations). Based on experiences from other countries, the paper suggests amendment of the law to allow environmental organizations to engage in environmental public interest litigation as a plaintiff to recover the public interests of the whole society.
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14
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The point of Marxism-Leninism about man
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Lê Thị Ngân
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Journal of Tradition and Development, issue 15
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The paper analyzes the views of Marxism-Leninism on the human person. Man consists of two aspects of nature and society. These two aspects are related to each other, the social aspect is nature of human. To raising the human level, the Party and the State of Vietnam have strengthened education and training, human resources development.
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15
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Globalization and some changes in the Vietnam family today
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Lê Văn Hùng
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Journal of Educational Theory, issue 227
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The paper analyses the impact of globalization on the change of the Vietnam family today, include both of positive and negative trend: Transformation in structure, function, and relationships in Vietnam family today.
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16
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Legislation on the protection of Agricultural land in Vietnam
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Vũ Văn Tuấn
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Journal of Democracy and Law, Justice issue
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The article analyses the provisions of Land Law 2013 and related documents on agricultural land protection; identifies a number of vague provisions and proposes finalization of legislation on agricultural land protection
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17
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Protect rice-growing land through the provisions of the financial legislation
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Vũ Văn Tuấn, Doãn Hồng Nhung
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Journal of Resources and Environment, issue 13 (219)
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The article analyses the provisions of Land Law 2013 and related documents on financially to protect rice land; identifies a number of vague provisions and proposes finalization of legislation on financially to protect rice land
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18
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Gender impacts of climate change in agricultural production: a case study in Giao Lac, Giao Thuy, Nam Dinh
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Nguyễn Tất Thắng, Ngô Thế Ân, Nguyễn Thị Hương Giang
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Journal of Science and Development, vol. 13, issue 3 (2015), pp. 464-473
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Using gender analysis approach and participatory methodologies, the study aims to find out gender impacts of climate change in agricultural production to propose appropriate solutions for gender equity in climate change (CC) adaptation and disaster mitigation policy at local level. The study found, CC and disasters produced high pressure for Giao Lac commune. Due to gender role, the impacts of CC on men and women were different. Results of study also pointed out the positive change of society perception in the role of women. They participated in decision making of nearly 70% solutions for CC adaption in horticulture and livestock, get involve in 100% financial solutions. However, improving the role of women in production and CC adaptation activities, accompanying with burden of housework and other gender gap might increase gender inequality in Giao Lac Commune. Thus, this study propose, local government and other stakeholder should take gender equality into account for any CC adaption or mitigation policy or plan which is being or will be implemented in this commune.
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19
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A Review of Climate Change Education in High Schools
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MSc. Nguyễn Tất Thắng
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Journal of Educational Equipment, issue 117, May 2015, pp. 17-20, ISSN 1859-0810
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Climate change (CC) has serious impacts for all the countries in the world. This global change directly affects the survival of humanity, so climate change education has become an urgent need of many education systems. It is generally believed that, integrating climate change in curricula will contribute to the improvement of student’s competences in order to adapt with climate change and its’ consequences. This articles aims to present an overview of integrating climate change in education system in general and some particularly cases in biology curriculum of high school. Many models and innovations of climate change education are implemented successfully in Vietnam and countries around the world which focus on improving infrastructures of schools which contribute to climate change mitigation; improving competencies for climate change adaptation and disaster risks reduction etc. Biology is a subject which has many advantages for integrating climate change education at high school level. However, hitherto, studies of these fields are rare.
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20
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Using Problem-BasedfFor intergragting Climate Change Education in Biology at High School Level
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MSc. Nguyễn Tất Thắng,
MSc. Dương Thị Hoàn
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Journal of Educational Equipment, issue 117, May 2015, pp. 56-58, ISSN 1859-0810
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Using gender analysis approach and participatory methodologies, the study aims to find out gender impacts of climate change in agricultural production to propose appropriate solutions for gender equity in climate change (CC) adaptation and disaster mitigation policy at local level. The study found, CC and disasters produced high pressure for Giao Lac commune. Due to gender role, the impacts of CC on men and women were different. Results of study also pointed out the positive change of society perception in the role of women. They participated in decision making of nearly 70% solutions for CC adaption in horticulture and livestock, get involve in 100% financial solutions. However, improving the role of women in production and CC adaptation activities, accompanying with burden of housework and other gender gap might increase gender inequality in Giao Lac Commune. Thus, this study propose, local government and other stakeholder should take gender equality into account for any CC adaption or mitigation policy or plan which is being or will be implemented in this commune.
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21
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The attitude of young women to marriage life
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Vũ Thị Khánh Linh, Đỗ Ngọc Bích
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Journal of Science, vol. 60, pp.188-194
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This article focuses on analysing attitudes of young women for marriage and family life, which emphasizes the roles as wife and mother. Most group can be studied have a positive attitude toward their marriage today. They are satisfied with the role as wife and mother, but they are assumed. This positive attitude is maintained in marriage until now. Besides, there is still a small percentage of customer can be studied tense. tired of her role as wife and mother. They have a very pessimistic attitude toward marriage today. This suggests that the relationship between the attitudes of young woman as wives, mothers and their satisfaction with marriage and family life.
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22
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Overview of seedling technology and vegetable seedlings used in safe vegetable production
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Nguyễn Thanh Hải, Lê Minh Lư, Lương Văn Vượt, Lê Vũ Quân, Nguyễn Xuân Thiết, Nguyễn Văn Năng
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Journal of Rural Industry
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Overview of seedling technology and vegetable seedlings used in safe vegetable production
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23
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Students’ awareness of cohabitation before marriage.
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Đặng Thị Vân, Nguyễn Huyền Thương
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Journal of Educational Science, Jan 20156
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Cohabitating before marriage has become a trend among young people, including students. This article present survey finding interviewed 360 students at Vietnam National University of Agriculture about issue. Most of students fully understand the concept of cohabitation before marriage. According to the author, to improve students' awareness of cohabitation, they need to be given access to information by social organization, student association and student-political board as well, be supervised by the landlord and dormitory management board.
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24
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Using Game-Based for Integrating Climate Change Education in Teaching Biology it High Schools
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Nguyễn Tất Thắng
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Journal of Educational Equipment, issue 118, pp. 18-21
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Using game-based for teaching will create interest, active participation and creativity for learning. Climate change is a global phenomenon which has relative contents to Biology. Using games which contains climate change issues and being designed scientifically, being multiple in forms and appropriate with objectives of Biology and psychology of learners will produce positive impacts, for instance: ebullience in class, friendly environment, flexible learning methods which allow learners learning while playing. These game-based lessons will help to establish knowledge, skills and built and friendly lifestyles for learners by actively way.
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25
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Organizing Creative Experienced Based Learning Activities – Foundation for Establishing a Model of Schools As Local Enterprise
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Nguyễn Tất Thắng, Dương Thị Hoàn
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Journal of Educational Equipment, issue 118, pp. 81-84
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Through experienced based learning, leaners are able to improve their own competencies, for instance social values, life skills, critical thinking, etc. These obtainments will help learners in reality. In order to conduct experienced based learning, schools need to apply significant change in management, evaluation system, improvement of school infrastructure and facilities as well as participation of community and students’ family. Model of schools as local enterprises are appropriate solution which help learners study from real experiences in order to improve their social and scientific qualities and to find out their interest in future occupations.
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26
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Using Game-Based For Intergrating Climate Change Education In Teaching Biology At High School
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Nguyễn Tất Thắng
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Journal of Educational Equipment, issue 119, pp. 5-8
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Using game-based for teaching will create interest, active participation and creativity for learning. Climate change is a global phenomenon which has relative contents to Biology. Using games which contains climate change issues and being designed scientifically, being multiple in forms and appropriate with objectives of Biology and psychology of learners will produce positive impacts, for instance: ebullience in class, friendly environment, flexible learning methods which allow learners learning while playing. These game-based lessons will help to establish knowledge, skills and built and friendly lifestyles for learners by actively way.
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27
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Organizing Creative Experienced Based Learning Activities – Foundation For Establishing A Model Of Schools As Local Enterprise
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Nguyễn Tất Thắng
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Journal of Education, special issue, June 2015, pp. 67-70
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Through experienced based learning, leaners are able to improve their own competencies, for instance social values, life skills, critical thinking, etc. These obtainments will help learners in reality. In order to conduct experienced based learning, schools need to apply significant change in management, evaluation system, improvement of school infrastructure and facilities as well as participation of community and students’ family. Model of schools as local enterprises are appropriate solution which help learners study from real experiences in order to improve their social and scientific qualities and to find out their interest in future occupations.
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28
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Using Picture And Videos Which Integrated Climate Change Education For Teaching Biology At High School
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Nguyễn Tất Thắng
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Journal of Educational Equipment, special issue, July 2015, pp. 21-24
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Climate change is global phenomenon which had and has been affecting to environment, living being and humanity. Biology at high school is a subject which has many advantages for integrating climate change education. Pictures and videos can facilitate visual climate change lessons. Using pictures and videos integrated climate change themes appropriately, logically, and scientifically will help leaners study more actively accordance with the improvement of knowledge, skills and behavior to cope with climate change.
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29
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Some Theoretical And Practical Issues Of Integrated Teaching In High School
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Nguyễn Tất Thắng
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Journal of Education, issue 360, pp. 46-48
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Integrated teaching has been studied and applied according to different directions to aim to fully develop learners’ abilities in countries all over the world. Integration is one of the opinions about designing programs, writing textbooks and teaching materials in many countries. By using the method of theoretical analysis, the paper contributes to systematizing the definitions of integration, integrated teaching, opinions, aims, and principles of integrated teaching. The study on the state of integrated teaching in high school will form the basis for further research on this field.
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30
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Designing Essessment Questions Based On Competences Development For Plant Diseases Prevention Topic, Technology Subject For Grades 10
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Nguyễn Tất Thắng, Nguyễn Thị Hương Giang
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Journal of Educational Science, issue 118, pp. 62-64
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Testing and evaluating learning outcome based on competencies development either help teachers to assess students’ performance or help students see their improvement in learning process. Designing questions and evaluation exercises based on competencies development for Plants disease prevention topic in Technology Subject of Grade 10 promise creating innovations in learning outcomes assessment, teaching and learning methodologies and improving teaching and learning quality at schools.
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31
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Process Of Integrating Climate Change Education In Teaching Biology At High Schools
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Nguyễn Công Ước
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Journal of Educational Science, issue 123, December
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Climate change is the biggest challenge of humanity in this 21st century. Integrating climate change education into Biology at high school enable student to absorb knowledge and skill in order to tackle climate issues in reality. This article aims to provide principles and process of integrating climate change education in teaching Biology at high school level. Implementation of these findings will improve students’ knowledge, skills and awareness to combat climate change through learning Biology.
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32
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Research on the relationship between adhesion coefficient and wheel slip of a mini tractor on Vietnam farmland
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Đặng Tiến Hòa, Đặng Đức Thuận
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Journal of Science and Technology, issue 27
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Conducting the method of direct assay, the paper presents a research on the relationship between adhesion coefficient and wheel slip of a mini tractor BS-12 on different farmlandsso as to identifypulling – adhesion properties of tractors. The results showed that wheel adhesion of a tractor is affected by farmland of which if there is an increase in stiffness adhesion coefficient of the wheel will increase.
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33
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Position selection of load sensor to control the transmission ratio of the continuously variable transmission for a small four wheel tractor
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Nguyễn Công Thuật, Bùi Hải Triều, Bùi Việt Đức
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Journal of Science and Technology, issue 27, April 2015
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A basic parameters used to control the transmission ratio of the continuously variable transmission (CVT) on the combined tractor is loading capacity. The selection and placement of loading sensor reflects immediately and exactly the loading change which is an important factor to controlling CVT ratio accurately and timely to ensure the engine to operate stably at selected position. Based on the survey results of the simulation model, the paper provides a basic for selection and placement of loading sensor for automatic controlling the ratio of steepless stratified transmission for a small four-wheel tractor.
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34
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Building theoretical model to research the directional stability of rubber caterpillar tractor conjugated with rotary tilling when they operate on agricultural land slopping land
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Phạm Thị Thu Hằng, Nguyễn Ngọc Quế, Lê Trung Dũng
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Journal of Science and Technology, issue 27, April 2015
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Steady movement of tractor-implement combination (TIC) is an important characteristics that impact directly on productivity and quality of production in forestry and agriculture mechanization. The research paper presents method of building theoretical model for studying directional stability of rubber caterpillar tractor conjugated with rotary tilling when they operated on slopping land. The research out-put is used to evaluate the impact of some structure data on the stability of TIC as well as choose a properly mode of the TIC on slopping land in Vietnam.
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35
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Free Vibration Analysis of Functionally Graded Plates Using Higher
Order Shear Deformation Theories (HSDT)
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Dương Thành Huân, Lê Minh Lư
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Journal of Science and Development, vol. 13, issue 1, pp. 99-109
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A higher order shear deformation theory (HSDT) is presented for free vibration analysis of simply supported (diaphragm), elastic functionally graded (FG), rectangular, plates. Functionally graded materials (FGMs), although heterogeneous are idealized as continua with their mechanical properties changing smoothly with respect to the spatial coordinates. Poisson’s ratio is assumed to beconstant,buttheir Young’s moduli and densities vary continuously in the thickness direction according to the volume fraction of constituents, which is mathematically modelled as power law function. The equations of motion are obtained using Hamilton’s principle employing HSDT. Navier’s solution is used to solve the equations of motion. The effect of variation of material properties in terms of gradation index, the effects of aspect ratios, thickness-to-side ratio on the natural frequencies of FG plates is studied in this article. The numerical results are compared with results available in the literature to validate theoretical model of the paper.
Key word: Free vibration analysis, power-law functionally graded plate, shear deformation plate theory.
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36
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Performance evaluation of hydraulic transmission on Multipurpose Self-propelled machines
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Bùi Việt Đức
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Journal of the University of Transport Technology
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Driving performance is a criteria for ability to work, has been widely used in the design and operation and use hydraulic machines. Multipurpose Self-propelled machines is motivation, it has capable mobile and connected with a variety of machines and equipment to perform of many different work and hydraulic transmission is solution for the optimal choice to correspond maximum requirements actuator and connections. On the basis of inheriting and developing the hydraulic system of machines and specialized equipment, the paper introduces hydraulic transmission and controls with many hydraulic PTO, designed for multi-purpose self-propelled machine, is assessment on base of the calculation determined circuit driving performance of hydraulic transmission and controls, used to drive the mobile system and actuator connected to machines.
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37
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Select the circuit structure of the position control system used in agriculture
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Bùi Hải Triều, Nguyễn Trọng Minh
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Journal of Science and Development, issue 1, pp. 5
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The exact control of mechanism position in agricultural machines is an important task to improve the capacity and quality of the machines. According to results of the survey on imitative models of source circuits in hydraulic
system, the article provided solutions for source circuit structure in position control used in agriculture to improve controlling property suitable for production conditions in Vietnam.
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38
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Building theoretical model to research the directional stability of rubber caterpillar tractor conjugated with rotary tilling when they operate on agricultural land slopping land
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Nguyễn Ngọc Quế,
Phạm Thu Hằng
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Journal of the Transportation Engineering Association, 8th edition, Hanoi University of Industry
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Steady movement of tractor-implenment combination (TIC) is an important characteristics that impact directly on productivity and quality of production in forestry and agriculture mechanization. The research paper presents method of building theoretical model for studying directional stability of rubber caterpillar tractor conjugated with rotary tilling when they operate on slopping land. The research out put is used to evaluate the impact of some structure data on the stability of TIC as well as choose a properly mode of the TIC on slopping land in Vietnam.
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39
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Static and Free Vibration Analysis of Functionally Graded Plates Using The Simple Higher
Order Shear Deformation Theories (S-HSDT)
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Dương Thành Huân, Lê Minh Lư
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Journal of Science and Development, vol. 13 issue 5, pp. 797-812
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This paper used the simple higher order shear deformation theory (S-HSDT) to analyse the static and free vibration of simply supported (diaphragm), elastic functionally graded (FG), rectangular, plates. Functionally graded materials (FGMs), although heterogeneous are idealized as continua with their mechanical properties changing smoothly with respect to the spatial coordinates. Poisson’s ratio is assumed to be constant, but their Young’s moduli and densities vary continuously in the thickness direction according to the volume fraction of constituents, which is mathematically modelled as power law function. The equations of motion are obtained using Hamilton’s principle employing S-HSDT. Navier’s solution is used to solve the equations of motion. The effect of variation of material properties in terms of gradation index, the effects of aspect ratios, thickness-to-side ratio on the bending, the stresses and the natural frequencies of FG plates are studied in this article. The numerical results are also compared with results available in the literature to validate theoretical model of the paper.
Keywords: Static analysis, vibration analysis, power-law functionally graded plate, shear deformation plate theory.
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40
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Some Results Of Researching About The Rice Hull Biochar Press
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Lê Minh Lư, Nguyễn Chung Thông
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Tạp chí Công nghiệp nông thôn Số 19, trang 9-14
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This study recommended the principle diagram and calculation base for the rice hull biochar press. It is screw-type extruder that works continuously two stages. The elements of biochar are pressed by the descending of lathe of screw thread. The process of moving of biochar are combined of the progressive motion and the rotary motion. The changed rule of pressure is complex and depends on many factors.
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41
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Static and free vibration analysis of functionally graded cylindrical shell panel using the first-order shear deformation theory (FSDT)
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Dương Thanh Huân
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Journal of the Institute of the Deformation of Solid Mechanics, issue 1
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This paper used the first-order shear deformation theory (FSDT) to analyse the bending and free vibration of simply supported functionally graded (FG) cylindrical shell panel. Functionally graded materials (FGMs), although heterogeneous are idealized as continua with their mechanical properties changing smoothly with respect to the spatial coordinates. Poisson’s ratio is assumed to be constant, but their Young’s moduli and densities vary continuously in the thickness direction according to the volume fraction of constituents, which is mathematically modelled as power law function. The equations of motion are obtained using Hamilton’s principle. Navier’s solution is used to solve the equations of motion. The numerical results are also compared with results available in the literature to validate theoretical model of the paper. The effect of variation of material properties in terms of gradation index, the effects of aspect ratios, thickness-to-side ratio on the bending and the natural frequencies of FG cylindrical panel are studied in this article
Keywords: Static analysis, free vibration analysis, power-law functionally graded cylindrical panel, First-order shear deformation theory.
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42
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Modelling and simulating the solar power collector for sea fish drying equipment using solar energy
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Trần Như Khuyên,
Nguyễn Xuân Trung,
Đinh Vương Hùng,
Nguyễn Thanh Hải,
Trần Như Khánh
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Journal of Agriculture and Rural Development, issue 12
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Influence of the volume ratio index, the ratio of sheet sizes to the individual oscillator frequencies are investigated. The numerical results are compared to published publications in international journals to verify the calculation model that the article has developed..
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43
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Comparison of INC and P&O Algorithms in Maximum Power Point Tracking Control of Independently PV System
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Nguyễn Viết Ngư,
Lê Thị Minh Tâm,
Trần Thị Thường,
Nguyễn Xuân Trường.
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Journal of Science and Development, issue 8
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Solar energy is cleanandfree of costand doesnot pollute the environment. Theresearch of solar energy systems plays a very important role that contributes to fully exploit the natural energy resources while traditional energy sources become scare. Maximum Power Point Tracker (MPPT) control for Solar panelsconsidered as an indispensable part of the solar power system is applied in order to improve the efficiency of solar panels. This paper describedand comparedPerturb and Observer(P&O) andIncremental Conductance (INC) algorithms that were used to implement for Maximum Power Point control of Solar panels. Simulation results showed that INC algorithm had a better effect than P&O algorithm did.
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