Vietnam Journal of Science and Technology

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Multi-band perfect absorption induced by breaking the symmetry of metamaterial structure
Vietnam Journal of Science and Technology - Tập 57 Số 4 - Trang 477-483 - 2019
Dinh Hong Tiep, Bui Son Tung, Bui Xuan Khuyen, Vu Dinh Lam
In this work, a multi-band metamaterial perfect absorber is demonstrated numerically and experimentally in the microwave region based on the breaking symmetry of geometrical structure. Initially, when the structure, which is designed in the X shape, is in the symmetric geometry, only one absorption peak is observed. By breaking the symmetry of structure, new absorption peaks emerge, leading to the... hiện toàn bộ
#metamaterial #perfect absorption #multi-band
On models with wobbling disk for brake squeal
Vietnam Journal of Science and Technology - Tập 59 Số 3 - Trang 357-367 - 2021
Tuan Nguyen Thai Minh, Nils Gräbner
Among many mathematical models of disk brakes for the explanation of brake squeal, models with wobbling disk have their own advantage over planar models. Applying a recently developed matrix form of Euler equations in rigid body dynamics, the equations establishment process can now be performed with almost all popular computing software. Furthermore, the presented models are more generalized in te... hiện toàn bộ
#5.4.1. #5.4.2.
Fuzzy sliding mode control of a structure based on hedge algebras containing input time delay
Vietnam Journal of Science and Technology - Tập 57 Số 4 - Trang 513-523 - 2019
Bui Hai Le, Le Tung Anh, Bui Van Binh, Nguyen Thai Tat Hoan
In this paper, the authors present the sliding mode control problem of a structure using hedge-algebras-based fuzzy controller considering the impact of time delay (de-sHAC). Controlled model is a structure subjected to earthquake excitations. Numerical simulations are implemented in order to show advantages of the proposed controller. Obtained results include: variation of maximum displacement an... hiện toàn bộ
#fuzzy control #sliding mode control #hedge algebras #input time delay
Analyzing movement behavior of zebrafish in different sized confined areas
Vietnam Journal of Science and Technology - Tập 61 Số 6 - Trang 1080-1088 - 2023
Quach Kha Quang, Nguyen Quoc Anh
Movement behavior of zebrafish (Danio rerio) was analysed according to different sizes of observation arena (four sizes:and ). The observation arena was separated into corner, boundary and central areas based on experimental data. The results showed that the shapes of the corner, boundary and central areas were accordingly different in different sizes of the arena. Individuals stayed in the bounda... hiện toàn bộ
#Confined areas #Monitoring #Movement behavior #Zebrafish (Danio rerio)
NGHIÊN CỨU TÍNH CHẤT ĐIỆN-TỪ CỦA HỆ VẬT LIỆU TỔ HỢP (1-x)La0,7Ca0,3MnO3 + xLa1,5Sr0,5NiO4
Vietnam Journal of Science and Technology - Tập 50 Số 4 - Trang 529 - 2017
Trần Đăng Thành, Nguyễn Thị Hà, Đỗ Hùng Mạnh, Phạm Thanh Phong, Vũ Đình Lãm, Lê Văn Hồng
Hệ vật  liệu  tổ hợp (1-x)La0,7Ca0,3MnO3 + xLa1,5Sr0,5NiO4  (0  x  0,4) được chế  tạo bằng phương pháp nghiền phản ứng kết hợp với ủ nhiệt. Khi tăng nồng độ pha điện môi La1,5Sr0,5NiO4 trong mẫu, nhiệt độ chuyển pha sắt từ - thuận từ hầu như không đổi (TC ~ 252 K) trong khi đó nhiệt độ chuyển pha kim loại - điện môi giảm từ 251 K với x = 0,0 xuống 65 K với x = 0,2. Khi  x ≥ 0,25, tính chất dẫn đ... hiện toàn bộ
Calculation of the role of indochina countries in global warming and its consequences in the world
Vietnam Journal of Science and Technology - Tập 51 Số 1 - Trang 1-10 - 2017
Alexander Tarko, Tran Van Lang
This paper presents the calculation of the change cycle Carbon dioxide (CO2) in the global biosphere with the aid of spatial mathematical models. The absorption of CO2 emissions from burning fossil fuels, deforestation, and soil erosion by terrestrial ecosystems have been calculated for all countries in the world, especially the countries of Indochina. The paper also provides several experiments t... hiện toàn bộ
#global warming #mathematical model #Kyoto protocol
Assessing the shoreline changes in Tra Vinh provinceusing multi-temporal remote sensing data
Vietnam Journal of Science and Technology - Tập 56 Số 5 - Trang 612-624 - 2018
Tran Ha Phuong, Hoang Phi Phung, Nguyen Thanh Hung, Hoang Cong Tri
The erosion – deposition of shore line is not only a natural phenomenon, but also influenced by human activities. In recent decades, these changes occur more frequently with changes in the shape of shoreline, the change in area of coastal mangroves as well as loss of productive land. In the trend of sea level rise, a study on changes of estuaries is necessary, in order to preserve and develop the ... hiện toàn bộ
#shoreline changes #remote sensing #climate change #sea level rise.
Investigating the anti-inflammatory activity of an ethanolic extract from Artocarpus tonkinensis leaves using a collagen antibody-induced arthritic mouse model
Vietnam Journal of Science and Technology - Tập 56 Số 3 - Trang 286-294 - 2018
Tran Duc Quan, Dao Duc Thien, Nguyen Thanh Tam, Nguyen Thi Hoang Anh, Nguyen Thi Cuc, Nguyen Thi Nga, Tran Van Sung, Le Thi Hong Nhung, Nguyen Hoang Sa, Sabrina Adorisio, Domenico V. Delfino, Do Thi Thao, Trinh Thi Thuy
The obtained results here demonstrate that the 70% ethanolic leaf extract of A. tonkinensis (AT2), traditionally used in Vietnamese folk medicine for treating arthritic symtoms, has beneficial effects on pro-inflammatory cytokine inhibition and in an experimental arthritic mouse model. LPS-stimulated RAW 264.7 macrophages treated with AT2 showed a significant decrease in the production of IL-6 and... hiện toàn bộ
Effect of high glucose-induced hyperglycemia on Viral Haemorrhagic Septicaemia Sirus (VHSV) infection in adult zebrafish
Vietnam Journal of Science and Technology - Tập 58 Số 1 - Trang 1-11 - 2020
Tran Van Cuong, Nguyen Thi Thoa
This study, we conducted a high glucose immersion protocol to induce hyperglycemic zebrafish, later on, with the aim to evaluate the relationship between hyperglycemia and VHSV infection using the zebrafish model. As the results, zebrafish immersed in a 2000 ppm glucose solution for 10 days, FBG has increased two times as compared to control. In addition, hyperglycemic zebrafish was more susceptib... hiện toàn bộ
#Diabetes mellitus #glucose #hyperglycemia #VHSV #zebrafish
High performance liquid chromatography assay for determination of moxifloxacin in human plasma
Vietnam Journal of Science and Technology - Tập 57 Số 3 - Trang 336-343 - 2019
Luong Thi My Hanh, Nguyen Thi Minh Diep, Pham Thi Ngoc Mai, Nguyen Xuan Truong
A simple reversed phase HPLC method with UV detection has been successfully developed and validated for determination of moxifloxacin in human plasma. The sample pretreatment involves only single-step protein precipitation with tricloroacetic acid. Moxifloxacin was measured in plasma using a validated HPLC method with UV detector at 295 nm, C18 column (25cm×4.5mm, 5µm), a mixture of phosphate buff... hiện toàn bộ
#Moxifloxacin #protein precipitation #tricloroacetic acid #HPLC method #human plasma
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