Vietnam Journal of Science and Technology
Công bố khoa học tiêu biểu
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On models with wobbling disk for brake squeal
Vietnam Journal of Science and Technology - Tập 59 Số 3 - Trang 357-367 - 2021
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......
#5.4.1. #5.4.2.
A new flavanone glycoside with antimicrobial and cytotoxic activities from Camellia hakodae Ninh leaves
Vietnam Journal of Science and Technology - Tập 62 Số 4 - Trang 686-696 - 2024
ABSTRACT – HCTN8: Camellia hakodae Ninh, belonging to the golden subgroup of Camellia (Theaceae), is a Camellia species native to Vietnam and primarily found in Tam Dao, Vinh Phuc province. This study aimed to isolate and identify the flavonoids from the leaves of Camellia hakodae Ninh. As a results, a new flavanone glycoside, named camehakonin A (1), was discovered alongside six known flavon......
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
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......
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
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......
#Diabetes mellitus #glucose #hyperglycemia #VHSV #zebrafish
Preparation and antibacterial effect in vitro against Pantoea stewartii causing jackfruit bronzing bacterium of ZnO/chitosan oligosaccharide-iodine complex nanomaterial
Vietnam Journal of Science and Technology - - 2024
Nano ZnO/chitosan oligosaccharide (ZnO/COS) and nano ZnO/chitosan oligosaccharide-iodine complex (ZnO/COS-I2) prepared in this study are new materials consisting of ZnO nanoparticles (12.3 - 15.0 nm) dispersed in COS and COS-I2 solutions. Both ZnO/COS and ZnO/COS-I2 nanomaterials have the ability to resist Pantoea stewartii (P. stewartii) causes jackfruit bronzing bacterium. The COS with a low mol......
#Pantoea stewartii #nano ZnO/COS #nano ZnO/COS-I2 #jackfruit
PHÂN LẬP VI SINH VẬT ĐỐI KHÁNG MỘT SỐ NGUỒN BỆNH NẤM THỰC VẬT VÀ ĐÁNH GIÁ HOẠT TÍNH CỦA CHÚNG IN VITRO VÀ IN VIVO
Vietnam Journal of Science and Technology - - 2014
Hiện nay, có khoảng hơn 80.000 loài nấm được biết có khả năng gây bệnh cho cây trồng, trong đó F.oxysporum, F.solani, Phytophthora sp là những loài gây thiệt hại lớn nhất , chúng có thể phá hủy toàn bộ vụ thu hoạch của các cây trồng quan trọng như: tiêu, cà phê, cà chua... Cùng với sự phát triển nhanh chóng của khoa học và công nghệ, nhiều nhà khoa học trên thế giới đã nghiên cứu ứng dụng biện phá......
A SIMPLE ALGORITHM FOR FINDING FAST, EXACTLY TILES INTERSECT WITH POLYGONS
Vietnam Journal of Science and Technology - - 2012
In this article, we present a simple algorithm that allows us to find tiles intersect quickly and precisely with a given polygon. This is the one of important tasks in maintaining tile system for Web Map services today. In this study, 75% of tiles can be successfully saved by use of our newly developed method as compared with the conventional Minimum Bounding Rectangle method when applying for adm......
Effect of calcium-alginate and essential oil on Colletotrichum acutatum and the shelf life of the grape
Vietnam Journal of Science and Technology - Tập 57 Số 6 - Trang 657-664 - 2019
The purpose
#Colletotrichum acutatum #Ca-alginate #antimicrobial activity #cinnamon oil #holy basil oil #peppermint oil
Lithographic fabrication and spectroscopic characterization of a THz metamaterial absorber
Vietnam Journal of Science and Technology - Tập 59 Số 1 - Trang 40-46 - 2022
THz metamaterial absorbers are often studied by computational techniques, where the influence of actual material parameters and fabricating limitation has not been completely understood. Here we present an experimental investigation on a far-infrared metamaterial absorber composed of a gold disk-shaped resonator, a silicon oxide spacer, and a gold film. The samples are fabricated using the UV lase......
#perfect absorbers #metamaterials #infrared spectroscopy
Oxidized maize starch: characterization and its effect on the biodegradable films - Part II. Infrared spectroscopy and solubility
Vietnam Journal of Science and Technology - Tập 55 Số 4 - Trang 395-402 - 2017
The effects of hypochlorite level, i.e. 0.5; 1 and 2 active chlorine g/100g starch, on the properties of oxidized maize starch were investigated by FT-IR and solubility of oxidized starch and starch film. The obtained results shown that there was no difference of IR spectroscopy graph between native starch and oxidized starch. Although the analytical results indicated that there were carbonyl and ......
#sodium hypochlorite #maize starch #starch oxidized #solubility #IR spectroscopy
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