https://www.vjol.info.vn/index.php/mostc/issue/feedVietnam Journal of Science, Technology and Engineering - C2024-03-17T12:19:29+07:00Open Journal Systems<p><strong>Tạp chí của Bộ Khoa học và Công nghệ</strong></p>https://www.vjol.info.vn/index.php/mostc/article/view/92653Effects of humidity and temperature on quality factor of micro-beam resonators in atmospheric pressure and gas rarefaction2024-03-17T12:19:22+07:00Nguyen Chi Cuong*, Trinh Xuan Thang, Lam Minh Thinh, Vuong Dinh Duy Phuc, Truong Huu Ly, Ngo Vo Ke Thanh, Le Quoc Cuongkhoahocvacongnghevietnam@gmail.comPhan Minh Truongkhoahocvacongnghevietnam@gmail.com<div>At atmospheric pressure (p=101325 Pa), the effects of humidity and temperature on moist air become important when discussing the quality factor of micro-cantilever and micro-bridge resonators. The squeeze film damping (SFD) problem, the dominant damping source for micro-beam resonators, is modelled using the modified molecular gas lubrication (MMGL) equation with finite element modelling (FEM) in the eigenvalue problem.</div>2024-03-15T00:00:00+07:00Bản quyền (c) https://www.vjol.info.vn/index.php/mostc/article/view/92654Effect of annealing temperature and doping concentrations on structure and optical properties of Eu3+-doped TiO2 nanomaterials2024-03-17T12:19:23+07:00Nguyen Tri Tuan*, Vu Thi Hang, Nguyen Trong Tuankhoahocvacongnghevietnam@gmail.comTong Thi Hao Tam*khoahocvacongnghevietnam@gmail.comNguyen Tu, Do Quang Trung, Nguyen Van Du, Tran Minh Tienkhoahocvacongnghevietnam@gmail.comNguyen Van Quangkhoahocvacongnghevietnam@gmail.comManh Trung Trankhoahocvacongnghevietnam@gmail.com<div>In this study, we successfully synthesized europium-doped TiO<sub>2</sub>(TiO2:Eu<sup>3+</sup>) nanomaterials (NMs) with crystalline sizes ranging from 6.5 to 71.7 nm through a sol-gel method. Analysis of X-ray diffraction (XRD) patterns and ultraviolet-visible (UV-Vis) spectra indicates that the substitution of smaller-sized Ti<sup>4+ </sup>ions (0.745 Å) by larger-sized Eu<sup>3+ </sup>ions (0.947 Å) was more efficient at higher doping concentrations and annealing temperatures...</div>2024-03-15T00:00:00+07:00Bản quyền (c) https://www.vjol.info.vn/index.php/mostc/article/view/92655Analysis of hydraulic drive circuit selection for a carrot collecting system2024-03-17T12:19:24+07:00Ngoc Danh Dang*, Xuan Thiet Nguyenkhoahocvacongnghevietnam@gmail.com<div>Compared to conventional mechanical transmissions, hydraulic transmission has the disadvantage of lower energy efficiency. However, it is widely employed in various working machines such as construction machines, off-road vehicles, forest logging machines, and especially agricultural machinery, owing to its flexibility in design, geometric arrangement, and simplicity in operation...</div>2024-03-15T00:00:00+07:00Bản quyền (c) https://www.vjol.info.vn/index.php/mostc/article/view/92656Study on the equilibrium and kinetics of nickel (II) adsorption on cellulose from peanut shell modified with chitosan2024-03-17T12:19:24+07:00Thi Lan Phung*, Thi Kim Giang Nguyen, Phuong Hien Ho, Thanh Nga Phamkhoahocvacongnghevietnam@gmail.com<div>In this study, cellulose was produced by activating peanut shells with 5% NaOH as an alkaline agent and bleaching with 5 wt.% H<sub>2</sub>O<sub>2</sub>. Before being modified with chitosan, the cellulose was slightly oxidized withammonium persulfate to introduce carboxyl groups...</div>2024-03-15T00:00:00+07:00Bản quyền (c) https://www.vjol.info.vn/index.php/mostc/article/view/92657Preparation of pyridinium-based ionic liquid and application as a green catalyst for the synthetic route of 4H-1-benzopyran-5(6H)-ones2024-03-17T12:19:25+07:00Huong Ngoc Thi Dao, The Thai Nguyen, Tran Huyen Thi Nguyen, Thuy Hong Ngoc Phan, Phuong Hoang Tran*khoahocvacongnghevietnam@gmail.com<div>1-(4-sulfobutyl)pyridinium chlorozincate ionic liquid was synthesised in high yield (89%) through a simple route and characterised using FT-IR, NMR, and HRMS spectroscopy. The one-pot reaction was employed for the condensation reaction of benzaldehydes, 5,5-dimethyl-1,3-cyclohexanedione, and dicyanomethane, utilising the prepared ionic liquid catalyst...</div>2024-03-15T00:00:00+07:00Bản quyền (c) https://www.vjol.info.vn/index.php/mostc/article/view/92658Antifungal activity of a methanolic extract of Glycyrrhiza uralensis Fisch. root against Fusarium oxysporum and Phytophthora capsici2024-03-17T12:19:25+07:00Dang-Minh-Chanh Nguyen, Woo-Jin Jungkhoahocvacongnghevietnam@gmail.comDang-Minh-Chanh Nguyen*, Van-Viet Nguyenkhoahocvacongnghevietnam@gmail.comThi-Hoan Luongkhoahocvacongnghevietnam@gmail.com<div>In the present study, we investigated the antifungal activity of a methanolic extract of Glycyrrhiza uralensis Fisch. root, which inhibited the growth of the plant pathogens Fusarium oxysporum and Phytophthora capsici. The EC 50 values of the G. uralensis Fisch...</div>2024-03-15T00:00:00+07:00Bản quyền (c) https://www.vjol.info.vn/index.php/mostc/article/view/92659Development of direct C-3 difluoromethylation reaction for application in synthesis of quinoline-related drugs2024-03-17T12:19:26+07:00Thanh Tung Truong*khoahocvacongnghevietnam@gmail.comJohn Nielsenkhoahocvacongnghevietnam@gmail.com<div>Fluorine holds a prominent position within the realm of drug discovery and development, substantiated by its presence in approximately 25% of drugs approved by the US Food and Drug Administration (FDA). Consequently, the advancement of new fluorination reactions stands as a pivotal area in medicinal chemistry...</div>2024-03-15T00:00:00+07:00Bản quyền (c) https://www.vjol.info.vn/index.php/mostc/article/view/92660 Vietnamese cassava varieties progression across 50 years2024-03-17T12:19:26+07:00Long Hoang*, Kim Hoangkhoahocvacongnghevietnam@gmail.comMai T.T. Nguyenkhoahocvacongnghevietnam@gmail.comDoan. N.Q. Nguyenkhoahocvacongnghevietnam@gmail.comKim Hoangkhoahocvacongnghevietnam@gmail.comClair Hershey, Reinhardt Howelerkhoahocvacongnghevietnam@gmail.com<div>Vietnamese cassava varieties constitute the fundamental and pivotal element in the sustainable development programme for cassava. This article aims to encapsulate the advancements made over nearly five decades in breeding and enhancing Vietnamese cassava varieties...</div>2024-03-15T00:00:00+07:00Bản quyền (c) https://www.vjol.info.vn/index.php/mostc/article/view/92661Nursery rearing freshwater prawn, Macrobrachium rosenbergii, in biofloc system integrated with red seaweed, Gracilaria tenuistipitata, at different stocking densities under zero water exchange2024-03-17T12:19:27+07:00Tien Hai Ly, Le Hoang Vukhoahocvacongnghevietnam@gmail.comLy Van Khanh, Nguyen Thi Ngoc Anh*khoahocvacongnghevietnam@gmail.com<div>This study was conducted to assess the effects of stocking densities on the water quality, survival and growth of the freshwater prawn</div> <div>Macrobrachium rosenbergii postlarvae (PL) cultured in a biofloc system integrated with red seaweed (Gracilaria tenuistipitata). Postlarvae prawns weighing 0.012±0.001 g were stocked at densities of 1,000, 1,500, 2,000, and 2,500 PL/m<sup>3</sup>, noted as D1, D1.5, D2, and D2.5, respectively...</div>2024-03-15T00:00:00+07:00Bản quyền (c) https://www.vjol.info.vn/index.php/mostc/article/view/92662RNA isolation by two different methods in analysing adipose-biomarkers of mouse adipose tissues2024-03-17T12:19:27+07:00Dinh Toi Chu, Hue Vu Thi*khoahocvacongnghevietnam@gmail.comNgoc Hoan Lekhoahocvacongnghevietnam@gmail.com<div>The RNeasy Mini Kit and the TRI Reagent protocol are commonly employed techniques for extracting total RNA and are widely utilised in research pertaining to the expression of adipose biomarkers. This study was undertaken to establish and determine an appropriate method for isolating RNA from frozen adipose tissue, with the objective of analysing adipose biomarkers...</div>2024-03-15T00:00:00+07:00Bản quyền (c) https://www.vjol.info.vn/index.php/mostc/article/view/92663Expression of several deubiquitinase and tyrosine phosphatase genes involved in inflammatory response in lymphoma2024-03-17T12:19:27+07:00Nguyen Hoang Giang, Nguyen Thi Xuan*khoahocvacongnghevietnam@gmail.comNguyen Trong Hakhoahocvacongnghevietnam@gmail.com<div>Lymphoma represents a heterogeneous group of cancers affecting the lymphatic system, encompassing non-Hodgkin lymphoma (NHL) and Hodgkin lymphoma (HL). The majority of NHL cases originate from B cells. HL is characterized by the presence of rare Hodgkin and Reed-Sternberg cells...</div>2024-03-15T00:00:00+07:00Bản quyền (c) https://www.vjol.info.vn/index.php/mostc/article/view/92664Anti-inflammatory effect of gallic acid-conjugated chitooligosaccharides in lipopolysaccharide-stimulated RAW 264.7 macrophages2024-03-17T12:19:28+07:00Van-Hoai Bui, Hong-Tham N. Vo, Thanh-Tuan Duong, Dai-Nghiep Ngo*khoahocvacongnghevietnam@gmail.comVan-Hoai Bui, Hong-Tham N. Vokhoahocvacongnghevietnam@gmail.comSe-Kwon Kimkhoahocvacongnghevietnam@gmail.com<div>The aim of the present study is to investigate the anti-inflammatory effect of gallic acid grafted onto COS chains (GA-COS), focusing on the reduction of nitric oxide production, downregulation of inflammatory signals such as inducible nitric oxide synthase (iNOS), gene expression of cytokines such as TNF-α, IL-1β, IL-6, and nuclear factor kappa B (NF-κB) signalling, including the p50 and p65 subunits...</div>2024-03-15T00:00:00+07:00Bản quyền (c) https://www.vjol.info.vn/index.php/mostc/article/view/92665Factors affecting the coagulation of milk protein during quark cheese processing in Vietnam2024-03-17T12:19:28+07:00Chinh Nghia Nguyen, Hang Ngan Dinh, Thu Trang Nguyen, Ha Trang Nguyen, Thi Trang Nguyen, Ky Son Chu, Thu Trang Vu*khoahocvacongnghevietnam@gmail.comGiang Hoangkhoahocvacongnghevietnam@gmail.com<div>In recent years, cheese consumption in Vietnam is markedly rising, leading to the attention of local milk processors on cheese making. Quark-type cheese, a traditional food in Central Europe, is a type of well-known acid-coagulated cheese product...</div>2024-03-15T00:00:00+07:00Bản quyền (c) https://www.vjol.info.vn/index.php/mostc/article/view/92666Development of a lateral flow immunoassay with HRP enhancement for spiked SARS-CoV-2 protein N detection in human saliva2024-03-17T12:19:29+07:00Minh Hieu Vukhoahocvacongnghevietnam@gmail.comMinh Hieu Vu, Doan Hong Ngoc Tran, Minh-Anh Dang-Trinhkhoahocvacongnghevietnam@gmail.comDoan Hong Ngoc Tran, Huynh Chan Khonkhoahocvacongnghevietnam@gmail.comHuynh Chan Khon*khoahocvacongnghevietnam@gmail.com<div>The Coronavirus (SARS-CoV-2) is an enveloped RNA virus that caused a dangerous COVID-19 pandemic following an outbreak in Wuhan, China in 2019. In response to the pandemic, the development of lateral flow assays (LFAs) has been crucial for the detection of viruses, commonly targeting the spike (S) or nucleocapsid (N) protein in nasopharyngeal swab (NS) specimens...</div>2024-03-15T00:00:00+07:00Bản quyền (c) https://www.vjol.info.vn/index.php/mostc/article/view/92667 Environmental and health impacts of air pollution: A mini-review2024-03-17T12:19:29+07:00Linh-Thy Le, Khanh-Bang V. Quang, Trieu-Vi Vo, Thanh-Mai T. Nguyenkhoahocvacongnghevietnam@gmail.comLinh-Thy Le, Thi-Viet-Huong Dao, Xuan-Thanh Bui*khoahocvacongnghevietnam@gmail.com<div>Air pollution is one of the leading risk factors for death but also a significant contributor to the global disease burden, affecting quality of life. According to a World Health Organisation (WHO) report, seven million people die from air pollution every year, and 9 out of 10 people worldwide breathe polluted air...</div>2024-03-15T00:00:00+07:00Bản quyền (c)