https://jst.vn/index.php/etsd/issue/feed 2026-07-15T00:00:00+00:00 JST - Engineering and Technology For Sustainable Development jst@hust.edu.vn Open Journal Systems https://jst.vn/index.php/etsd/article/view/1142 2025-12-01T06:53:46+00:00 MSc. Thanh Dam Nguyen damnt@vnu.edu.vn MSc. Manh Huy Nguyen manhhuy162dhkhtn@gmail.com Ms. Linh Ngoc Nguyen linhnguyenngoc1612@gmail.com BSc. Thi Khanh Chi Nguyen khanhchi271020@gmail.com Assoc. Prof. Hong Anh Duong duonghonganh@hus.edu.vn Prof. Hung Viet Pham vietph@vnu.edu.vn

In this study, a capillary electrophoresis method utilizing capacitively coupled contactless conductivity detection (CE-C⁴D) was developed and evaluated for the simultaneous analysis of memantine (MEM) and donepezil (DON) in pharmaceutical samples for Alzheimer’s disease treatment. The analytical conditions were established, including a background electrolyte (BGE) composed of 1.0 M acetic acid, a separation voltage of -22 kV, and siphonic sample injection at a height of 10 cm for 60 seconds. Under these conditions, the limits of detection (LOD) for MEM and DON were 0.59 mg/L and 1.39 mg/L, respectively. The relative standard deviations (RSD) for peak area and migration time were less than 6% and 1%, respectively, in intra-day repeatability assessments (n = 7), and less than 8% and 4%, respectively, in inter-day reproducibility assessments (n = 5) for mixed standard samples at a concentration of 20 mg/L. The recovery efficiency for both analytes in spiked standard matrices ranged from 94 to 108%. The CE-C⁴D method was applied to analyze two real pharmaceutical samples containing DON as the main active ingredient, and the results indicated that the difference between the content determined by CE-C⁴D and the manufacturer’s labeled content was less than 10%.

2026-01-16T00:00:00+00:00 Copyright (c) 2026 Engineering and Technology For Sustainable Development https://jst.vn/index.php/etsd/article/view/1131 2026-01-15T13:22:11+00:00 Dr. Engr Dao Huy Toan toan.daohuy@hust.edu.vn Dr. Engr Luu Van Chinh chinhluuvan@gmail.com MSc. Do Anh Tuan doanhtuan@tdtu.edu.vn Dr. Engr Le Thi Thuy thuy.lethi@hust.edu.vn

β-Amino alcohols are important bifunctional compounds characterized by the presence of both amine and hydroxyl groups within the molecule, which contributes to their diverse biological activities. Numerous experimental and clinical studies have demonstrated that β-amino alcohols play a central role in the pharmacophoric structures of various clinically used drugs This study focuses on the synthesis of a series of β-amino alcohols via epoxide ring-opening reactions using both natural and synthetic building blocks, followed by an evaluation of their novel biological activities. A total of 10 β-amino alcohols were successfully synthesized, including 3 novel compounds reported for the first time. These compounds were evaluated for cytotoxic activity against four cancer cell lines: rhabdomyosarcoma (RD), human hepatocellular carcinoma (Hep-G2), lung cancer (Lu), and uterine cancer (Fl), as well as for antimicrobial activity against 8 microbial strains representing 4 groups: gram-negative bacteria, gram-positive bacteria, filamentous fungi, and yeasts. The results showed that the cytotoxic activity of the synthesized compounds was generally low, with only two compounds exhibiting weak activity and the remainder showing no activity. Although these findings do not support the anticancer potential of the compounds, they do suggest a favorable safety profile for exploring other biological applications. In contrast, the antimicrobial screening yielded promising results: five compounds demonstrated inhibitory effects against 1–3 microbial strains, and notably, one compound exhibited activity against five strains.

2026-06-08T00:00:00+00:00 Copyright (c) 2026 Engineering and Technology For Sustainable Development https://jst.vn/index.php/etsd/article/view/1121 2026-01-07T03:02:26+00:00 Prof. Van Khoi Nguyen khoinguyen56@gmail.com Dr. Thu Trang Pham thutrang90vhh@gmail.com Ms Thi Minh Phuong Nguyen phuongntm@gmail.com Ms. Thu Huong Nguyen happyhuong1990@gmail.com Dr. Quang Huy Nguyen huynqhn@gmail.com Mr. Cong Hoan Do hoando8239@gmail.com Mr. Ngo Vu Duong vu.viic@gmail.com Dr. Tuan Hung Hoang htuanhung07@gmail.com

In this study, the plasticizing effect of glycerol in the preparation of thermoplastic starch (TPS) from dry heat treatment (DHT) cassava starch was studied. DHT cassava starch-based TPS samples were prepared by using an internal mixer with different contents of glycerol (20, 25, 30, and 35 wt.%) and then were characterized by different analysis methods (Thermogravimetric analysis (TGA), X-ray diffraction (XRD), and Fourier transform infrared spectrum (FTIR). The mechanical properties were also investigated. The physicochemical characteristics of TPS samples showed that the structure of starch completely changed after the plasticization process in the presence of glycerol. The plasticizing efficiency of glycerol was also evaluated through the difference in mechanical properties results. Among the samples studied, the sample with 25% plasticizer showed the best plasticizing efficiency, with a tensile strength of 13.57 MPa and an elongation at break of 54.27%.

2026-06-04T00:00:00+00:00 Copyright (c) 2026 Engineering and Technology For Sustainable Development https://jst.vn/index.php/etsd/article/view/1112 2025-12-29T11:12:42+00:00 Assoc. Prof. Dan-Thuy Van-Pham vpdthuy@ctu.edu.vn Mr. Duc-Ninh Lam lamducninh2@gmail.com Ms. Thi Ngoc Bich Nguyen nguyenthingocbich2512@gmail.com

This study addresses the mechanical strength–swelling trade-off in poly(vinyl alcohol) (PVA) hydrogels for wound care by adopting a crosslinker-free PVA/starch (ST) design. The objective was to statistically optimize composition for balanced tensile strength (TS), elongation at break (EAB), and swelling index (SI). Hydrogels were prepared by two freeze–thaw cycles at −80 °C, varying PVA (8.6–11.4 wt%) and ST/PVA (1.5–8.5 wt%), and modeled using a Central Composite Design. Properties were broadly tunable (TS 3.8–8.9 MPa; EAB 229–438%; SI 217–363%). The optimum 11.4 wt% PVA with 1.5 wt% ST/PVA achieved TS 7.85 MPa, EAB 387.2%, and SI 273%, in close agreement with predictions; scanning electron microscopy showed homogeneous ST dispersion and ductile fracture. Notably, mechanical strength approached chemically crosslinked benchmarks while eliminating toxic reagents. These results establish a green, scalable route to robust, absorbent PVA/ST membranes suited to dynamic wound sites and provide response-surface models as practical design rules for future functionalization.

2026-01-30T00:00:00+00:00 Copyright (c) 2026 Engineering and Technology For Sustainable Development https://jst.vn/index.php/etsd/article/view/1102 2025-12-01T07:12:13+00:00 Dr Quoc Manh Vu quocmanhsp2@gmail.com Ms Ngoc Thao Dinh vuquoctrungvn@yahoo.com Mr Tien Dat Le vuquoctrungvn@yahoo.com Dr Dang Dat Nguyen datnd@hnue.edu.vn Dr Thi Huong Vu vuhuongth@gmail.com Dr Bich Viet Nguyen Thi vietntb@hnue.edu.vn Dr Ngoc Linh Nguyen linhcupj@gmail.com Ms Hong Nhung Nguyen Thi nhung7022@gmail.com Prof. Dr Quoc Trung Vu trungvq@hnue.edu.vn

Lovastatin (Lov), a lipid-lowering statin, suffers from low oral bioavailability due to poor solubility and extensive first-pass metabolism. This study developed poly(lactic acid)/chitosan (PLA/Cs) composite films incorporating Lov (5–20 wt.%) and examined how drug loading influences structural characteristics and release behavior. Films were prepared via a solution-based method. FT-IR analysis confirmed hydrogen bonding and dipole interactions among PLA, Cs, and Lov, while FESEM imaging revealed a morphological shift of Lov from rod-like crystals to spherical particles, with the PLA/Cs ratio of 5/5 and Lov accounting for 10 wt.% the total polymer (PCL5510), sample displaying the most uniform dispersion. Drug release followed a biphasic pattern: an initial burst release from surface-adsorbed drug, followed by sustained release governed by diffusion and polymer matrix degradation. Lov content strongly influenced release kinetics, with PCL5510 achieving slow, stable release at pH 2.0 and accelerated release at pH 7.4, conditions favorable for intestinal absorption. These findings identify PCL5510 as an optimal formulation for controlled oral delivery of statins and highlight the potential of PLA/Cs-based systems in drug delivery applications.

2026-01-20T00:00:00+00:00 Copyright (c) 2026 Engineering and Technology For Sustainable Development https://jst.vn/index.php/etsd/article/view/1113 2026-01-27T12:11:55+00:00 Dr. Mr. Trung Hieu Nguyen hieu.nguyentrung@hust.edu.vn Dr. Mr. Duc Trung Nguyen trung.nguyenduc@hust.edu.vn Thi Thao Nguyen giang.nguyentruong1@hust.edu.vn Ngoc Anh Lang giang.nguyentruong1@hust.edu.vn Ms. Hien Nguyen Thi Thu hien.ntt20201139@hust.edu.vn Thi Van Anh Pham giang.nguyentruong1@hust.edu.vn Dr. Mr. Truong Giang Nguyen giang.nguyentruong1@hust.edu.vn

The production of traditional Vietnamese rice wine involves a simultaneous saccharification and fermentation (SSF) process, which is a complex biochemical system influenced by multiple factors, including pH, temperature, substrate concentration, microbial biomass, and metabolic byproducts. Among these factors, temperature plays a critical role throughout fermentation, as it strongly affects both product quality and microbial kinetics. In this study, a dynamic mathematical model based on differential equations was developed to describe the liquid-phase stage of traditional rice wine fermentation using experimental data derived from artisanal practices. The model focuses on yeast growth and ethanol formation during the predominantly ethanol-producing phase and aims to support process analysis and standardization. Dynamic simulations were implemented in MATLAB using the stiff solver ODE15s (Ordinary differential equations), with key initial conditions specified as model inputs. The model generates fermentation trajectories and kinetic profiles under defined operating conditions. Simulation results show strong agreement between predicted and experimentally measured temperature profiles, while glucose consumption and ethanol production are presented as mechanistic model predictions consistent with established fermentation theory.

2026-06-02T00:00:00+00:00 Copyright (c) 2026 Engineering and Technology For Sustainable Development https://jst.vn/index.php/etsd/article/view/1140 2025-12-23T10:18:43+00:00 Dr. Chinh-Nghia Nguyen nguyenchinhnghia89@gmail.com Dr. Hai Van Nguyen van.nguyenhai@hust.edu.vn Mrs. Thu Thuy Dinh thuydinhthu@gmail.com Mrs. Kim Tuyen Tran trantuyeninpc@gmail.com Dr. Quang Hoa Le hoa.lequang@hust.edu.vn Assoc. Prof. Thu Trang Vu trang.vuthu@hust.edu.vn

Bovine mastitis is one of the most common diseases causing losses to the dairy industry. To reduce the use of antibiotic for treatment of this disease, essential oils (EOs) have high potential to apply in the field without any harmful chemical sanitation for raw milk. In this study, the antibacterial effect of Cinnamon cassia, Chenopodium ambrosioides and Litsea cubeba EOs against bacteria isolated from bovine mastitis were investigated. Among the three EOs, C. cassia EO showed the strongest antimicrobial activity against all tested bacteria. Moreover, the combination of C. cassia-C. ambrosioides and C. cassia-L. cubeba showed a significant synergistic effect with the total FIC value from 0.5 to 0.75, lower the MIC by 2 to 4 times. Those results suggested that EOs could be used to reduce lower the concentration used, minimum effective dose of the drugs and to replace the antibiotic treatment for bovine mastitis in the future.

2026-06-04T00:00:00+00:00 Copyright (c) 2026 Engineering and Technology For Sustainable Development https://jst.vn/index.php/etsd/article/view/1396 2026-05-26T08:56:39+00:00 Xuan Bach Dao thang.leminh@hust.edu.vn Thanh Hung Nguyen thang.leminh@hust.edu.vn Minh Thang Le thang.leminh@hust.edu.vn Minh An Bui thang.leminh@hust.edu.vn

Hundreds of catalysts have been explored and developed for the oxidative coupling of methane process, most of which come from commercial chemicals, rare metals, and expensive materials that are not available and contain toxic chemicals. With the richness of nature, sources from biomass and sustainable materials are gradually being developed as substitutes. This work focuses on the conditions for synthesizing CaO from oyster shells, an abundant and available raw material, as well as a waste source that has not yet been fully utilized. The catalysts synthesized from these oyster shells were treated under different conditions to produce materials with different characteristics. All synthesized catalysts from oyster shells have a higher selectivity for hydrocarbons than the commercial CaO powder. Oyster shells heated up to 950 °C under continuous air flow were the most active catalyst, achieving a hydrocarbon selectivity of approximately 70.3% when the reaction was carried out at 750 °C. This exceptional selectivity comes from the strong basicity available in oyster shells, which increases the oxygen mobility and easily helps react. The catalysts were also evaluated for stability at 750 °C for 225 min with good results.

2026-05-26T00:00:00+00:00 Copyright (c) 2026 https://jst.vn/index.php/etsd/article/view/1075 2025-11-24T03:38:51+00:00 Ms. Thi Tra My Nguyen my.ntt211900@sis.hust.edu.vn Ms. Thu Uyen Bui uyen.bt240724e@sis.hust.edu.vn Assoc. Prof. Thi Thu Hang Le hang.lethithu@hust.edu.vn

Aqueous zinc-ion batteries (AZIBs) offer safety, low cost, and material abundance. However, their performance is limited by dendrite formation, side reactions, and poor cycling stability. This study preliminary examines the effects of various additives in aqueous electrolytes on the electrochemical behaviour of AZIBs by using contact angle, pH value, Hull cell, cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and linear scan voltammetry (LSV) measurements. The additives under investigation include urea, thiourea, serine, tyrosine and tryptophan, which are known as low toxic and biodegradable compounds. The obtained measurement results indicate that inclusion of the additives into the blank electrolyte of 1 M ZnSO4 at the low concentration of 5 mM only induced slightly change in the pH of the electrolyte, which had no significant impact on the corrosion behaviour of a zinc metal anode in the electrolyte. In addition, the contact angle of zinc metal with the electrolytes remained at values smaller than 90°, demonstrating the hydrophilicity of the zinc anode after addition of the additives. Among the investigated organic additives, urea, thiourea and tyrosine demonstrated mitigation of zinc dendritic growth as well as inhibition of parasitic reaction (hydrogen evolution reaction). However, at high concentrations (10-100 mM) the additives promoted the dendritic growth. The further intensive investigations are recommended to deploy, thus highlighting the role of targeted additive selection in enhancing the durability and operational safety of aqueous zinc-ion batteries.

2026-02-20T00:00:00+00:00 Copyright (c) 2026 Engineering and Technology For Sustainable Development https://jst.vn/index.php/etsd/article/view/1401 2026-05-29T09:31:07+00:00 Thi Thai Le dung.hoangthikim@hust.edu.vn Thi Kim Dung Hoang dung.hoangthikim@hust.edu.vn

The paper concentrated on effect of sweep angle of delta wing at very low speed of 5 m/s and attack angle of 20 degrees. Sweep angle changed inducing a change of shape of delta wing. Aerodynamic characteristics of delta wing were estimated by changing sweep angles (32, 45, and 60 degrees) within attack angle of 20 degrees and air velocity of 5 m/s. Firstly, experimental configuration was conducted to validate numerical results solving with help of ANSYS software. Results showed a good agreement between numerical and experimental method. Then, simulation method was used to carry out effect of delta wing shape on aerodynamic characteristics at low speed. From obtained results, it was remarked that, increasing sweep angle of delta wing from 32 to 60 degrees made reduce drag and lift forces. Aerodynamic quality of delta wing with high sweep angle was higher than that of a delta wing with small sweep angle.

2026-05-29T00:00:00+00:00 Copyright (c) 2026 https://jst.vn/index.php/etsd/article/view/1157 2026-02-23T13:17:04+00:00 Duc Hai Nguyen nguyenduchai@hnu.edu.cn

This study introduces the Micro-scale RVE Tool (MRT) and Quick Tool Model (QTM) for efficient prediction of the effective elastic properties of composite materials. A Python-based interface enables streamlined meshing, modeling, and property extraction. Compared to conventional methods, the approach significantly reduces computation time by optimizing code structure and automating stiffness parameter extraction. The MRT is built on multi-scale homogenization theory and allows for 3D RVE generation with varied fiber geometries. Finite element analysis and volumetric homogenization are used to compute elastic properties across different fiber volume fractions. Results show strong agreement with experimental data, validating the accuracy and efficiency of the proposed method.

2026-06-04T00:00:00+00:00 Copyright (c) 2026 Engineering and Technology For Sustainable Development https://jst.vn/index.php/etsd/article/view/1003 2025-12-22T07:42:43+00:00 Assoc. Prof. Trinh Nguyen Nhat trinh.nguyennhat@hust.edu.vn Assoc. Prof. Minh Tuan Nguyen tuan.nguyenminh@hust.edu.vn

This study investigates the impact of blending different types of cotton waste - carding waste and blowroom waste - into Ne16 yarns, using both ring (SNC) and rotor (SOE) spinning methods. Blending ratios of 10% and 20% were applied to evaluate their influence on yarn quality indicators, including thick places (+50%/km), thin places (−50%/km), neps (+200%/km), and hairiness. The results show that increasing the proportion of cotton waste significantly affects yarn evenness. For SNC yarns, blending with carding waste at 10% and 20% led to increases in thick places by 17.2% and 37.9%, while blowroom waste increased thick places by 5.9 and 8.1 times, respectively. A similar trend was observed for thin places and neps, with blowroom waste having a much more pronounced negative effect than carding waste. The hairiness of SNC yarns also increased slightly with higher blending ratios, with blowroom waste contributing to greater hairiness than carding waste. In contrast, SOE yarns demonstrated better resistance to the negative effects of waste blending. For all indicators, SOE yarns exhibited significantly lower increases in defects compared to SNC yarns. For instance, the number of thick places in SOE yarns with 10% and 20% carding waste was only 20.5% and 23.3% of those in SNC yarns, respectively. Blowroom waste tends to deteriorate yarn properties more severely than carding waste, and rotor spinning (SOE) offers better tolerance to recycled material blending than ring spinning (SNC).

2026-05-26T00:00:00+00:00 Copyright (c) 2026 Engineering and Technology For Sustainable Development https://jst.vn/index.php/etsd/article/view/1089 2026-01-07T18:31:07+00:00 Dr. Thuc Huong Giang Nguyen giang.nguyenthuchuong@hust.edu.vn Mrs Anh Phan phanngocanhasd@gmail.com Ha Hai Nguyen hanguyenhai@gmail.com Anh Dieu Tran anhtrandieu@gmail.com Son Trung Mai sonmaitrung@gmail.com Thao Thi Phuong Ha hathiphuongthao@gmail.com

Amid rising environmental pressures in emerging economies, the effectiveness of public environmental spending remains an open question. Vietnam, undergoing rapid industrialization and urban expansion, offers a unique setting to assess whether fiscal efforts translate into tangible environmental improvements. This study investigates the impact of provincial environmental protection expenditures (EPE) on air, water, and land quality across 63 provinces from 2019 to 2023. Building upon the DPSIR (Driving- Forces–Pressures–State–Impacts–Responses) framework, panel models and a Seemingly Unrelated Regression (SUR) system are employed to capture interlinked environmental outcomes. The findings reveal domain-specific effects: EPE significantly enhances wastewater treatment coverage, yet exhibits limited short-term influence on air pollution or land-use transitions. Socio-economic factors such as Human Development Index (HDI) and population density also shape environmental performance, improving emission efficiency and clean water access. These results underscore that fiscal environmental investments in Vietnam yield selective rather than universal benefits, emphasizing the importance of integrated, spatially targeted, and long-term fiscal strategies for sustainable environmental governance

2026-03-28T00:00:00+00:00 Copyright (c) 2026 Engineering and Technology For Sustainable Development https://jst.vn/index.php/etsd/article/view/1085 2025-12-09T06:07:34+00:00 Mr. Ha Minh Tri Nguyen Tri.nguyenhaminh@hust.edu.vn Dr. Thi Huong Tran huong.tranthi@hust.edu.vn Mr. Manh Dat Vu Dat.VM223578@sis.hust.edu.vn Mr. Trong Khoi Nguyen Khoi.NT223607@sis.hust.edu.vn

E-commerce has expanded rapidly, reshaping consumer behavior and logistics systems while creating significant environmental challenges. Delivery activities, especially last-mile transport, packaging waste, and energy use in digital infrastructure, contribute notably to rising greenhouse gas (GHG) emissions. This study reviews 174 peer-reviewed articles to examine how emissions from e-commerce logistics can be reduced. The analysis identifies five key themes. First, delivery operations and packaging are major emission sources. Second, drivers of reduction include stricter government regulations, emerging technologies, and corporate sustainability strategies. Third, adoption of green logistics faces obstacles such as high investment costs, limited infrastructure, weak regulatory frameworks, and low consumer acceptance. Fourth, government policies, including subsidies, waste management rules, and promotion of electric vehicles, play a decisive role in shaping practices. Finally, a range of mitigation solutions is highlighted, including electric and alternative vehicles, drones, parcel lockers, reusable packaging, and consumer behavior changes. By integrating bibliometric mapping with Research Focus Parallelship and Keyword Co-occurrence methods, this study consolidates fragmented knowledge and provides a clearer view of current research trends. The findings offer practical insights for policymakers, businesses, and researchers seeking to design effective and sustainable e-commerce delivery systems.

2026-01-06T00:00:00+00:00 Copyright (c) 2026 Engineering and Technology For Sustainable Development https://jst.vn/index.php/etsd/article/view/1057 2026-01-10T14:09:58+00:00 Ms Thao Nguyen Thi nguyentheorvp@gmail.com Ms My Duyen Tran Thi tranmyduyen12062005@gmail.com Ms Linh Do Khanh dokhanhlinh12080@gmail.com Ms. Kieu Oanh Nguyen Thi nguyenthikieuoanh16032000@gmail.com Prof. Quynh Lan Hoang Thi Lan.hoangthiquynh@hust.edu.vn

The rapid development of digital technology in modern life has led to the widespread emergence of media multitasking behaviour among university students, especially in high-tech learning environments such as Hanoi University of Science and Technology. This study uses the Media Multitasking-Revised (MMT-R) scale to assess the level of multitasking behaviour in the classroom among 257 students from various academic disciplines. The data were analysed using Exploratory Factor Analysis (EFA) and Confirmatory Factor Analysis (CFA). The theoretical model identifies two core behavioural constructs: Compulsive Phone Checking (CPC) and Media Distraction (MD). The results indicate that students tend to engage in multitasking at a moderate level, with no significant gender differences, suggesting that this behaviour is generational rather than gender specific. Furthermore, the intention to engage in multitasking is strongly associated with CPC - controlled device usage - while MD, which reflects passive and uncontrolled distraction, is no longer a significant predictor and may indicate signs of digital addiction. The findings suggest that the MMT-R scale can be used not only as a behavioural measurement tool but also as a screening and early diagnostic instrument to identify high-risk student groups. Based on this classification, students can be grouped to design appropriate interventions aimed at promoting more mindful use of digital devices in learning environments.

2026-06-03T00:00:00+00:00 Copyright (c) 2026 Engineering and Technology For Sustainable Development