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A Comparative Study on Different Solutions in Vibration and Buckling Analyses of Functionally Graded Porous Cylindrical Shells Under Compression in Thermal Environments 认领 引用
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作者 Nguyen Danh Truong 《Acta Mechanica Solida Sinica》 SCIE EI CSCD 2026年第6期879-890,共12页
This paper presents semi-analytical and analytical solutions for investigating the vibration,buckling,and post-buckling behavior of cylindrical shells surrounded by an elastic foundation and subjected to axial compres... This paper presents semi-analytical and analytical solutions for investigating the vibration,buckling,and post-buckling behavior of cylindrical shells surrounded by an elastic foundation and subjected to axial compression in a thermal environment.The shell’s central layer is composed of a functionally graded porous material,coated with two functionally graded layers and reinforced with rings,stringers,and spiral stiffeners.The governing equations of the shell are derived using Donnell’s theory with von Karman geometric nonlinearity.The Galerkin method and Runge–Kutta method are employed to determine the static and dynamic responses of the shell.Two radial deflection assumptions are considered to highlight their respective advantages and disadvantages.The reliability of the proposed model is demonstrated through comparison with results available in the literature.Additionally,the effects of various parameters—such as material properties,geometric dimensions,stiffener configurations,foundation characteristics,and temperature variations—on the static and dynamic buckling behavior of the shells are investigated. 展开更多
关键词 Axial compression Buckling analyses Functionally graded porosity Cylindrical shells Vibration
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Enhanced electrochemical performance of anthraquinone-based cathode for sodium ion batteries byπ-conjugated structure 认领 引用
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作者 Xiaotong Deng Zetao Wu +7 位作者 Anna Zhou Shuo-Hang Zheng Ziheng Cheng Guangming Li Yun Zhao Ronghua Zeng Nguyen Duc Hoa Xing-Long Wu 《Chinese Chemical Letters》 SCIE CAS CSCD 2026年第4期418-424,共7页
Quinone-based electrode materials hold significant promise for next-generation sodium-ion batteries due to their structurally tailorable frameworks,high theoretical capacities,and favorable redox potentials.However,di... Quinone-based electrode materials hold significant promise for next-generation sodium-ion batteries due to their structurally tailorable frameworks,high theoretical capacities,and favorable redox potentials.However,dissolution in organic electrolytes and structural instability during cycling critically impair their capacity retention and cycling durability.Herein,we designed and synthesized two novel acylimide materials N,N'-bis(2,6-anthraquinone diamine)-biphenyl diimide(DQ-BDI)and N,N'-bis(anthraquinone-2,6-diamine)-perylenyl diimide(DQ-PDI)with the gradual enhancement ofπ-conjugation.Electrochemical characterization reveals exceptional performance in DQ-PDI.At the current density of 50 mA/g,the DQ-PDI delivered the first discharge specific capacity of 158 mAh/g,and the capacity retention of 99%after 100 cycles,with the coulombic efficiency of nearly 100%.At a high current density of 500 mA/g,the DQ-PDI displays a high discharge capacity of 152 mAh/g.The reduction peaks of DQ-PDI located at 2.28 V and 1.34 V are the insertion reactions of sodium ion from the carbonyl groups on PTCDA unit and on DAAQ unit at both ends,respectively,and the two oxidation peaks at 2.58 V and 1.53 V corresponds to extraction reactions.Compared with DQ-BDI,DQ-PDI exhibits a largerπ-conjugation plane,which significantly enhances the intermolecularπ-πinteractions.It can well reduce the dissolution of the material in organic electrolyte,resulting in a higher discharge capacity,superior cycling stability and accelerated reaction kinetics.Ourπ-conjugation extension strategy establishes a new paradigm for designing dissolution-resistant,high-performance organic electrodes. 展开更多
关键词 Sodium-ion batteries Quinone electrode materials π-Conjugated system Structural stability Sodium storage mechanism
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Resource-adaptive and OOD-robust inference of deep neural networks on IoT devices 认领 引用 被引量：1
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作者 Cailen Robertson Ngoc Anh Tong +2 位作者 Thanh Toan Nguyen Quoc Viet Hung Nguyen Jun Jo 《CAAI Transactions on Intelligence Technology》 SCIE EI CSCD 2025年第1期115-133,共19页
Efficiently executing inference tasks of deep neural networks on devices with limited resources poses a significant load in IoT systems.To alleviate the load,one innovative method is branching that adds extra layers w... Efficiently executing inference tasks of deep neural networks on devices with limited resources poses a significant load in IoT systems.To alleviate the load,one innovative method is branching that adds extra layers with classification exits to a pre-trained model,enabling inputs with high-confidence predictions to exit early,thus reducing inference cost.However,branching networks,not originally tailored for IoT environments,are susceptible to noisy and out-of-distribution(OOD)data,and they demand additional training for optimal performance.The authors introduce BrevisNet,a novel branching methodology designed for creating on-device branching models that are both resourceadaptive and noise-robust for IoT applications.The method leverages the refined uncertainty estimation capabilities of Dirichlet distributions for classification predictions,combined with the superior OOD detection of energy-based models.The authors propose a unique training approach and thresholding technique that enhances the precision of branch predictions,offering robustness against noise and OOD inputs.The findings demonstrate that BrevisNet surpasses existing branching techniques in training efficiency,accuracy,overall performance,and robustness. 展开更多
关键词 branching DNNs dirichlet uncertainty energy based models
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IRL-TP: Deep Inverse Reinforcement Learning-Based Trajectory Planning for UAVs in Complex and Interference-Constrained Environments 认领 引用
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作者 Xuan-Thuc Nguyen Le-Minh Nguyen +3 位作者 Ngoc-Quynh Nguyen Nhu-Nghia Bui Dinh-Quy Vu Thai-Viet Dang 《Computers, Materials & Continua》 SCIE EI 2026年第8期1035-1056,共22页
The development of unmanned automated vehicles(UAVs)has become a key focus in aerial robotics,fueling the need for navigation systems capable of performing complex and delicate tasks with speed and precision.However,t... The development of unmanned automated vehicles(UAVs)has become a key focus in aerial robotics,fueling the need for navigation systems capable of performing complex and delicate tasks with speed and precision.However,the end-to-end path tracking process often encounters challenges in learning efficiency,generalization,and varying environmental conditions.In this paper,we propose the novel IRL-TP framework for learning-based UAVs’trajectory planning that employs a deep inverse reinforcement learning(IRL)approach.Firstly,the RL-based path planner must develop a reward function that effectively captures flight safety,collision avoidance,trajectory smoothness,and navigation efficiency within constrained environments filled with numerous obstacles.To achieve optimal results,a deep reward network is constructed to parametrize the unknown reward function,which effectively and implicitly models the satisfaction of multiple objectives.The regularization of entropy through the learned reward function is utilized to optimize the continuous control policy and improve stability and exploration ability during training with a soft actor-critic(SAC)agent.By combining the reward function inference and policy learning processes,the proposed framework empowers the UAVs to mimic expert behavior and create highly generalized navigation strategies in the“potential map”.In experimental environments with a dense obstacle level,our method achieves a success rate of 97.6%while maintaining an instability metric as low as 0.044 throughout the process.Furthermore,the number of episodes needed to converge the parameters was much faster than other methods(~340).The proposed model not only achieves rapid convergence and a reward value 1.6 times higher in the first 200 training episodes and 1.3 times higher after the entire training process,but also demonstrates an impressive inference time of 2.6 ms per step compared to the basic IRL framework.Compared to state-of-the-art methods—including DQN,PPO,SAC,BC,and GAIL—our approach achieves superior trajectory efficiency,enhanced safety margins,smoother motion,and greater training stability,even in complex 3D environments. 展开更多
关键词 Interference-constrained environments inverse reinforcement learning unmanned automated vehicles(UAV) soft actor-critic(SAC) trajectory planning
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MDGAN-DIFI: Multi-Object Tracking for USVs Based on Deep Iterative Frame Interpolation and Motion Deblurring Using GAN Model 认领 引用
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作者 Manh-Tuan Ha Nhu-Nghia Bui +1 位作者 Dinh-Quy Vu Thai-Viet Dang 《Computers, Materials & Continua》 SCIE EI 2026年第6期697-720,共24页
In the realm of unmanned surface vehicle(USV)operations,leveraging environmental factors to enhance situational awareness has garnered significant academic attention.Developing vision systems for USVs presents conside... In the realm of unmanned surface vehicle(USV)operations,leveraging environmental factors to enhance situational awareness has garnered significant academic attention.Developing vision systems for USVs presents considerable challenges,mainly due to variable observational conditions and angular vibrations caused by hydrodynamic forces.The paper proposed a novel MDGAN-DIFI network for end-to-end multi-object tracking(MOT),specifically designed for camera systems mounted on USVs.Beyond enhancing traditional MOT models,the proposed MDGAN-DIFI includes preprocessing modules designed to enhance the efficiency of processing input signal quality.Initially,a Deep Iterative Frame Interpolation(DIFI)module is used to stabilize frames in the spatiotemporal domain.Next,an enhanced generative adversarial network(GAN)model is applied to reduce motion blur affecting objects within the field of view.Finally,a YOLO-CSSA architecture combines dual infrared(IR)and RGB data streams to maintain consistent performance across diverse environmental conditions.By synthesizing intermediate frames and restoring blurred details,the framework seeks to stabilize object motion trajectories and recover distinctive appearance features prior to tracking.This approach directly tackles the main causes of tracking failure in maritime environments,such as motion discontinuities and visual degradation.Experimental results demonstrate that the proposed approach outperforms conventional methods in multi-object tracking on USVs,achieving a maximum accuracy(MOTA)of 47.0%and an IDF1 score of 50.1%under challenging operational conditions.Consequently,the proposed multi-object tracking network provides a more robust foundation for subsequent detection and data association processes. 展开更多
关键词 Multi-object tracking unmanned surface vehicles deep interactive frame interpolation motion blur generative adversarial networks(GAN)
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Novel interface regulation of Sn1.0Ag0.5Cu composite solders reinforced with modified ZrO2:Microstructure and mechanical properties 认领 引用 被引量：4
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作者 Fupeng Huo Zhi Jin +3 位作者 Duy Le Han Jiahui Li Keke Zhang Hiroshi Nishikawa 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2022年第30期157-170,共14页
With the trends of miniaturization and high density of electronic packaging,there has been an urgent demand to open up lead-free solders with high strength and ductility.In this study,a ZrO2-reinforced Sn1.0Ag0.5Cu... With the trends of miniaturization and high density of electronic packaging,there has been an urgent demand to open up lead-free solders with high strength and ductility.In this study,a ZrO2-reinforced Sn1.0Ag0.5Cu composite solder was designed.First,surface modification on ZrO2 was conducted with ball milling-pyrolysis method.Subsequently,NiO modified ZrO2(NiO/ZrO2)was added to the solder matrix with ultrasonic stirring.The morphology and interface of NiO/ZrO2 were discussed.Moreover,the microstructure,interface and mechanical properties of the composite solders were systematically studied.The results showed that NiO nanoparticles were evenly adhered to the ZrO2 surface,and the interface relationship between them was semi-coherent and coherent.Further,an appropriate addition of NiO/ZrO2 could refine the microstructure of composite solders.The refinement mechanism was systematically investigated.Besides,a micro-mechanical lock and non-micropored clean interface was formed between NiO/ZrO2 and the solder matrix.The Sn/NiO/ZrO2 interface system based on mutual solid solution was ingeniously designed.The ultimate tensile strength and elongation were increased synergistically,and the fracture mechanism transformed from a ductile−brittle mixed fracture mode to a ductile fracture mode.Therefore,a lead-free solder with high strength and ductility was obtained. 展开更多
关键词 SnAgCu composite solder ZrO2nanoparticles Refinement mechanism Surface modification Interface Reinforcements
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Formability improvement and blank shape definition for deep drawing of cylindrical cup with complex curve profile from SPCC sheets using FEM 认领 引用 被引量：3
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作者 Duc-Toan Nguyen Duy-Khoe Dinh +2 位作者 Hong-Minh Thi Nguyen Tien-Long Banh Young-Suk Kim 《Journal of Central South University》 SCIE EI CAS 2014年第1期27-34,共8页
In the current work, to predict and improve the formability of deep drawing process for steel plate cold rolled commercial grade （SPCC） sheets, three parameters including the blanking force, the die and punch comer ... In the current work, to predict and improve the formability of deep drawing process for steel plate cold rolled commercial grade （SPCC） sheets, three parameters including the blanking force, the die and punch comer radius were considered. The experimental plan according to Taguchi＇s orthogonal array was coupled with the finite element method （FEM） simulations. Firstly, the data from the test of stress-strain and forming limit curves were used as input into ABAQUS/Explicit finite element code to predict the failure occurrence of deep drawing process. The three parameters were then validated to establish their effects on the press formability. The optimum case found via simulation was finally confirmed through an experiment. In order to obtain the complex curve profile of cup shape after deep drawing, the anisotropic behavior of earring phenomenon was modeled and implemented into FEM. After such phenomenon was correctly predicted, an error metric compared with design curve was then measured. 展开更多
关键词 finite element method SPCC deep-drawing forming limit diagram criterion Taguchi＇s method earring prediction
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Upconversion luminescence of Gd2O3:Er3+and Gd2O3:Er3+/silica nanophosphors fabricated by EDTA combustion method 认领 引用 被引量：2
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作者 Le Quoc Minh Tran Kim Anh +6 位作者 Nguyen Duy Hung Pham Thi Minh Chau Nguyen Thi Quy Hai Ho Van Tuyen Vu Thi Thai Ha Vu Duc Tu Wieslaw Strek 《Journal of Rare Earths》 SCIE EI CAS CSCD 2019年第11期1126-1131,共6页
Gd2O3:Er^3+nanophosphors were fabricated by the combustion method in presence of Na2 ethylene diamine tetra acetic acid(EDTA-Na2)as fuel at not high temperature(≤350℃)within a very short time of 5 min.The added conc... Gd2O3:Er^3+nanophosphors were fabricated by the combustion method in presence of Na2 ethylene diamine tetra acetic acid(EDTA-Na2)as fuel at not high temperature(≤350℃)within a very short time of 5 min.The added concentration of Er^3+ions in Gd2O3 matrix was changed from 0.5 mol%to 5.0 mol%.The X-ray diffraction pattern of samples indicates the monoclinic structure of Gd2O3:Er^3+.The morphology and chemical composition analysis of the Gd2O3:Er^3+samples are characterized by a field emission scanning electron microscope(FESEM)and a Fourier-transform infrared spectrometer(FTIR).The photoluminescence(PL),photo luminescence excitation(PLE)and upconversion(UC)at room temperature of the prepared materials with different concentrations of Er^3+were investigated.The PL of Gd2O3:Er^3+nanomaterials are shown in visible at 545,594,623,648,688 nm under excitation at 275 nm.The emission bands from transitions of Er^3+from 2P3/2 to 4F9/2 are observed,UC luminescent spectra of the Gd2O3:Er^3+/silica nanocomposites under 976 nm excitation show the bands at 548 and 670 nm.The influence of excitation power at 980 nm for transitions were measured and calculated.The results indicate that the upconversion process of Gd2O3:Er^3+/silica is two photons absorption mechanism.The low temperature dependence of UC luminescent intensities of the main bands of Gd2O3:Er^3+was investigated towards development of a nanotemperature sensor in the range of 10-300 K. 展开更多
关键词 Upconversion luminescence Gd2O3:Er3+ Gd2O3:Er3+/silica Nanophosphors EDTA combustion Rare earths
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Engine performance and combustion characteristics of a direct injection compression ignition engine fueled waste cooking oil synthetic diesel 认领 引用
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作者 Thanh Viet Nguyen Khanh Duc Nguyen +1 位作者 Nang Xuan Ho Vinh Duy Nguyen 《International Journal of Coal Science & Technology》 EI CAS 2020年第3期560-570,共11页
Biodiesels produced from various feedstocks have been considered as alternative fuels used in internal combustion engines without major modifications.This research focuses on producing biodiesel from waste cooking oil... Biodiesels produced from various feedstocks have been considered as alternative fuels used in internal combustion engines without major modifications.This research focuses on producing biodiesel from waste cooking oil(WCOSD)by the catalytic cracking method using MgO as the catalyst and comparing the engine operating characteristics of the test engine when using WCOSD and traditional diesel(CD)as test fuels.As a result,the brake power of the test engine fueled WCOSD,and traditional diesel is similar.However,the engine fuel consumption in the case of using WCOSD is slight increases in some operating conditions.Also,the nitrogen oxides emissions of the test engine fueled WCOSD are higher than those of CD at all tested conditions.The trend is opposite for hydrocarbon emission as the HC emission of the engine fueled by WCOSD reduces 26.3%on average.The smoke emission of the test engine in case of using WCOSD is lower 17%on average than that of CD.However,the carbon monoxide emissions are lower at the low and medium loads and higher at the full loads.These results show that the new biodiesel has the same characteristics as those of commercial biodiesel and can be used as fuel for diesel engines. 展开更多
关键词 Feedstock Waste cooking oil Engine characteristics Exhaust missions Ignition timing Fuel consumption
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EXISTENCE AND STABILITY OF PERIODIC AND ALMOST PERIODIC SOLUTIONS TO THE BOUSSINESQ SYSTEM IN UNBOUNDED DOMAINS 认领 引用
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作者 Thieu Huy NGUYEN Truong Xuan PHAM +1 位作者 Thi Ngoc Ha VU The Sac LE 《Acta Mathematica Scientia》 SCIE CSCD 2022年第5期1875-1901,共27页
In this paper we investigate the existence and stability of periodic solutions(on a half-line R+)and almost periodic solutions on the whole line time-axis R to the Boussinesq system on several classes of unbounded ... In this paper we investigate the existence and stability of periodic solutions(on a half-line R+)and almost periodic solutions on the whole line time-axis R to the Boussinesq system on several classes of unbounded domains of Rn in the framework of interpolation spaces.For the linear Boussinesq system we combine the Lp—Lq-smoothing estimates and interpolation functors to prove the existence of bounded mild solutions.Then,we prove the existence of periodic solutions by invoking Massera’s principle.We also prove the existence of almost periodic solutions.Then we use the results of the linear Boussinesq system to establish the existence,uniqueness and stability of the small periodic and almost periodic solutions to the Boussinesq system using fixed point arguments and interpolation spaces.Our results cover and extend the previous ones obtained in[13,34,38]. 展开更多
关键词 Boussinesq systems periodic solutions almost periodic solutions unbounded domains smoothing estimates dual estimates interpolation spaces stability
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Monitoring the levels of brominated and organophosphate flame retardants in passenger cars:Utilisation of car air filters as active samplers 认领 引用 被引量：2
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作者 Long KTran Chang He +7 位作者 Dam Hoang Phuc Leisa-Maree LToms Xianyu Wang Meng Xiu Jochen FMueller Adrian Covaci Lidia Morawska Phong KThai 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2020年第5期142-150,共9页
Filters in residential and office air conditioning(A/C)systems have been used as sampling devices for monitoring different pollutants.However,cabin air filters(CAFs)in the A/C system of passenger cars have not been ut... Filters in residential and office air conditioning(A/C)systems have been used as sampling devices for monitoring different pollutants.However,cabin air filters(CAFs)in the A/C system of passenger cars have not been utilised for this purpose.In this study,we collected22 used CAFs from passenger cars in Hanoi,Vietnam to analyse for 8 polybrominated diphenyl ethers(PBDEs)and 10 organophosphate esters(OPEs).All the analytes were detected in more than 50%of samples with the exception of BDE153 and BDE154.The average concentrations of∑10OPEs and∑8 BDEs in the captured dust were 2600 and 40 ng/g,respectively with Tris(1-chloro-2-propyl)phosphate(TCIPP)and BDE209 as the dominant congener in OPE and BDE groups,respectively.CAFs are a potential tool to qualitatively assess the levels of semi-volatile chemicals in suspended dust in cars as a screening step for exposure assessment of those chemicals. 展开更多
关键词 Flame retardants Vehicle cabin Air quality Human exposure PBDEs OPEs
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Atomistic simulation of free transverse vibration of graphene,hexagonal SiC, and BN nanosheets 认领 引用 被引量：2
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作者 Danh-Truong Nguyen Minh-Quy Le +1 位作者 Thanh-Lam Bui Hai-Le Bui 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2017年第1期132-147,共16页
Free transverse vibration of monolayer graphene, boron nitride (BN), and silicon carbide (SiC) sheets is investigated by using molecular dynamics finite element method. Eigenfrequencies and eigenmodes of these three s... Free transverse vibration of monolayer graphene, boron nitride (BN), and silicon carbide (SiC) sheets is investigated by using molecular dynamics finite element method. Eigenfrequencies and eigenmodes of these three sheets in rectangular shape are studied with different aspect ratios with respect to various boundary conditions. It is found that aspect ratios and boundary conditions affect in a similar way on natural frequencies of graphene, BN, and SiC sheets. Natural frequencies in all modes decrease with an increase of the sheet’s size. Graphene exhibits the highest natural frequencies, and SiC sheet possesses the lowest ones. Missing atoms have minor effects on natural frequencies in this study. 展开更多
关键词 Atomistic simulation Hexagonal sheet Transverse vibration Molecular dynamics finite element method
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Effect of Poly-Alkylene-Glycol Quenchant on the Distortion, Hardness, and Microstructure of 65Mn Steel 认领 引用 被引量：2
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作者 Thi Xuan Tran Xuan Phuong Nguyen +4 位作者 Duong Nam Nguyen Dinh Toai Vu Minh Quang Chau Osamah Ibrahim Khalaf Anh Tuan Hoang 《Computers, Materials & Continua》 SCIE EI 2021年第6期3249-3264,共16页
Currently,the 65Mn steel is quenched mainly by oil media.Even though the lower cooling rate of oil compared to water reduces the hardness of steel post quenching,the deforming and cracking of parts are often minimized... Currently,the 65Mn steel is quenched mainly by oil media.Even though the lower cooling rate of oil compared to water reduces the hardness of steel post quenching,the deforming and cracking of parts are often minimized.On the other hand,the oil media also has the disadvantage of being ammable,creating smoke that adversely affects the media.The poly alkylene glycol(PAG)polymer quenchant is commonly used for quenching a variety of steels based on its advantages such as non-ammability and exible cooling rate subjected to varying concentration and stirring speed.This article examines the effect of PAG polymer quenching solution(with concentrations of 10%and 20%)on deformation,hardness,and microstructure of C-ring samples made of 65Mn steel.Furthermore,the performance of PAG polymer quenchant is also compared with those of two common quenching solutions:Water and oil.When cooling in water,the C-ring samples had the largest deformation and 2 times higher than the results obtained when a 10%PAG solution was used.In particular,similar levels of deformation on the C-ring samples were observed in both cases of 20%PAG solution and oil as the primary quenching media.Furthermore,the hardness level measured between the sampled parts quenched in the 20%PAG solution appeared to be more uniform than that obtained from the oil-quenched sample.The study of the microscopic structure of steel by optical microscopy combined with X-ray diffraction showed that the water hardened sample exhibited cracks and comprised of two phases,martensite and retained austenite.According to the results of Electron Back Scattering Diffraction(EBSD)analysis and backscattering electronic image(BSE),the content of austenite residue in the sample when the sample was cooled in PAG 10 and 20%solution was 3.21%and 4.73%,respectively and smaller than the measurements obtained from oil quenching solution.Thus,the 65Mn steel is cooled in 20%PAG solution for high hardness and more evenly distributed than when it is quenched in oil while still ensuring a small level of deformation.Therefore,the PAG 20%solution can completely replace oil as the main media used to quench the 65Mn steel. 展开更多
关键词 Polyethylene glycol electron backscattering diffraction quenching media cooling rate backscattering electronic image
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Blockchain for Education:Verification and Management of Lifelong Learning Data 认领 引用 被引量：2
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作者 Ba-Lam Do Van-Thanh Nguyen +2 位作者 Hoang-Nam Dinh Thanh-Chung Dao BinhMinh Nguyen 《Computer Systems Science & Engineering》 SCIE EI 2022年第11期591-604,共14页
In recent years,blockchain technology has been applied in the educational domain because of its salient advantages,i.e.,transparency,decentralization,and immutability.Available systems typically use public blockchain ... In recent years,blockchain technology has been applied in the educational domain because of its salient advantages,i.e.,transparency,decentralization,and immutability.Available systems typically use public blockchain networks such as Ethereum and Bitcoin to store learning results.However,the cost of writing data on these networks is significant,making educational institutions limit data sent to the target network,typically containing only hash codes of the issued certificates.In this paper,we present a system based on a private blockchain network for lifelong learning data authentication and management named B4E(Blockchain For Education).B4E stores not only certificates but also learners’training data such as transcripts and educational programs in order to create a complete record of the lifelong education of each user and verify certificates that they have obtained.As a result,B4E can address two types of fake certificates,i.e.,certificates printed by unlawful organizations and certificates issued by educational institutions for learners who have not met the training requirements.In addition,B4E is designed to allow all participants to easily deploy software packages to manage,share,and check stored information without depending on a single point of access.As such,the system enhances the transparency and reliability of the stored data.Our experiments show that B4E meets expectations for deployment in reality. 展开更多
关键词 Training data certificate verification and management private blockchain
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A simple and effective carrier lifetime characterization for semiconductor thin films 认领 引用 被引量：1
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作者 Bao Quy Le Tuan Nguyen Van +3 位作者 Dat Tran Quang Vi Le Dinh Thin Pham Van Nguyen Cuc Thi Kim 《Journal of Semiconductors》 EI CAS CSCD 2025年第7期66-77,共12页
Minority carrier lifetimesτare a fundamental parameter in semiconductor devices,representing the average time it takes for excess minority carriers to recombine.This characteristic is crucial for understanding and op... Minority carrier lifetimesτare a fundamental parameter in semiconductor devices,representing the average time it takes for excess minority carriers to recombine.This characteristic is crucial for understanding and optimizing the performance of semiconductor materials,as it directly influences charge carrier dynamics and overall device efficiency.This work presents a development of PbS thin film deposited by thermal evaporation,at which the PbS thin film was further employed for structural,optical properties,andτ.Especially,the PbS film is probed with an in-house setup for identifying theτ.The procedure is to subject the PbS thin film with a flashlight from a light source with a middle rotating frequency.The derivedτin the in-house characterization setup agrees well with the value from the higher cost characterizing approach of photoluminescence.Therefore,the in-house setup provides additional tools for identifying theτvalues for semiconductor devices. 展开更多
关键词 semiconductors minority carrier lifetime open circuit voltage decay PbS thin films
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Double-inline low-coherence digital holographic microscope for 3D nanoparticle positioning and classification 认领 引用
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作者 Tuan Duc Pham Yoshio Hayasaki +3 位作者 Thanh Tung Bui Thanh Tung Vu Van Thuc Tran Quang Duc Pham 《Nanotechnology and Precision Engineering》 EI CAS CSCD 2025年第4期98-105,共8页
A novel low-coherence digital inline holographic microscope for accurate three-dimensional(3D)position estimation and nanoparticle classification is proposed and validated.Two low-coherence digital inline holograms of... A novel low-coherence digital inline holographic microscope for accurate three-dimensional(3D)position estimation and nanoparticle classification is proposed and validated.Two low-coherence digital inline holograms of a sample containing numerous nanoparticles,generated by two illumination light beams forming a small angle with each other from a low-coherence light source,are employed to determine the nanoparticles’actual 3D positions.Each nanoparticle’s sub-holograms,extracted from the holograms of the sample,are used to reconstruct the intensity scattering image at its respective actual position using the Rayleigh–Sommerfeld backpropagation method.The intensity scattering image of each nanoparticle is then used to classify particles with similar sizes and shapes.The advantages of the proposed system include rapid and highly accurate 3D nanoparticle position determination and nanoparticle classification without the need to pre-prepare patterns or have prior knowledge of the nanoparticle characteristics. 展开更多
关键词 3D nanoparticle positioning Digital inline holographic microscopy Inline hologram
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Investigation and development on processing of Vietnamese lacquer 认领 引用 被引量：1
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作者 Chengzhang Wang Hongxia Chen +3 位作者 Hao Zhou Wenjun Li Li Lu Bach Trong Phuc 《Advances in Biological Chemistry》 CAS 2014年第1期79-85,共7页
Vietnamese sap and lacquerware have a splendid history. In order to promote a sustainable Vietnamese lacquer value chain, this review was carried out for us to investigate at site Vietnamese lacquer cultivation and pr... Vietnamese sap and lacquerware have a splendid history. In order to promote a sustainable Vietnamese lacquer value chain, this review was carried out for us to investigate at site Vietnamese lacquer cultivation and processing of lacquer sap, then introduce the chemical components, HPLC-MS characteristic, properity and polymerization mechanism, as well as processing techniques of Vietnamese lacquer sap. Combined with the experience of lacquer cultivation and processing of Chinese lacquer, key problems to restrict the development of lacquer value chain were analyzed in Vietnam, and some suggestions would also be proposed in this investigation. 展开更多
关键词 Vietnamese Lacquer Lacquer Sap Lacquerware UV Modification HPLC-MS
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Promoting Green Choices:Vietnamese Students’Intentions to Use Electric Taxi Services and Sustainability Factors 认领 引用
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作者 Dan Thi Thanh Nguyen Ngoc Thi Kim Pham 《Journal of Environmental & Earth Sciences》 CAS 2025年第6期157-170,共14页
Sustainable development has become a critical global priority,and green transportation solutions,such as electric taxis,play a vital role in achieving this goal.This study examines the factors influencing students’in... Sustainable development has become a critical global priority,and green transportation solutions,such as electric taxis,play a vital role in achieving this goal.This study examines the factors influencing students’intentions to adopt electric taxi services in Hanoi,Vietnam,as a step toward sustainable urban mobility.We surveyed 573 students and ana-lyzed key determinants using reliability tests,exploratory factor analysis(EFA),and linear regression.The results indi-cate that four factors significantly influence adoption intentions:Perceived Usefulness and Sustainability,Price,Brand Awareness,and Service Quality.Among these,Perceived Usefulness and Sustainability had the strongest positive im-pact,while Service Quality exerted the weakest influence.Notably,Habit and Ease of Use&Transaction Convenience were found to be statistically insignificant in the final model.These findings provide practical implications for business-es and policymakers aiming to use electric taxi adoption.To enhance appeal,stakeholders should emphasize environ-mental benefits,competitive pricing,and brand recognition while improving service reliability.By addressing these fac-tors,electric taxi services can accelerate the transition to sustainable transportation,aligning with global climate goals and transforming urban mobility.This study offers actionable insights for encouraging greener travel behaviors among students,a key demographic for long-term sustainability impact. 展开更多
关键词 Intention to Use Electric Taxi Student Hanoi Vietnam
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Comparison of Sensory Characteristics of Green Tea Produced in Thai Nguyen and Phu Tho Province, Vietnam 认领 引用 被引量：1
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作者 Dang Thi Minh Luyen Ha Duyen Tu +2 位作者 Philippe Lebailly Nguyen Duy Thinh Tu Viet Phu 《Journal of Food Science and Engineering》 2014年第2期107-114,共8页
Green tea is a popular product with a high consumption in Vietnam. Moreover, green tea produced in Tan Cuong commune, Thai Nguyen province, has long been recognized for its superior quality to those coming from other ... Green tea is a popular product with a high consumption in Vietnam. Moreover, green tea produced in Tan Cuong commune, Thai Nguyen province, has long been recognized for its superior quality to those coming from other regions of the country. This study aims at comparing the tea from Thai Nguyen and Phu Tho and finding out if the difference can be identified through sensory analysis. Two products picked from Tan Cuong, Thai Nguyen province, and two others from Phu Ho district, Phu Tho province were evaluated by a trained panel of 12 judges （11 women and 1 man）. The sensory evaluation of the dry tea （11 descriptors） was carried out separately from the brewed tea （21 descriptors） and brewed leaf （five descriptors） using an unstructured intensity scale （10 cm）. Statistic analyses have shown differences between regions in all three groups of attributes： dry leaf, liquor and brewed leaf. 展开更多
关键词 Green tea sensory analysis.
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Effects of CuO-CeO2Addition on Structure and Catalytic Properties of Three Way Catalysts 认领 引用
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作者 Nguyen The Luong Nguyen Duy Tien +2 位作者 Eiji Yamasue Hideyuki Okumura Keiichi N. Ishihara 《Journal of Materials Science and Chemical Engineering》 2017年第12期28-39,共12页
The noble metals (Pt, Pd, Rh) supported on Cu-Ce mixed oxides with γ-Al2O3 washcoat/FeCrAl substrate were investigated as catalytic performance of Three Way Catalysts (TWC) under simulated automotive exhaust feed gas... The noble metals (Pt, Pd, Rh) supported on Cu-Ce mixed oxides with γ-Al2O3 washcoat/FeCrAl substrate were investigated as catalytic performance of Three Way Catalysts (TWC) under simulated automotive exhaust feed gas. The structural, morphological features and catalytic activity were observed by X-ray diffractometry (XRD), scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET), X-ray photoelectron spectroscopy (XPS) and GC-TCD (Varian CP-4900). The catalytic performance of noble metals (Pt, Rh, Pd) supported on Cu-Ce mixed oxides with γ-Al2O3 washcoat/FeCrAl substrate was be compared with noble metals (Pt, Rh, Pd) supported on Ce-Zr mixed oxides with γ-Al2O3 washcoat/FeCrAl substrate and only γ-Al2O3 washcoat/FeCrAl substrate at various stoichiometric ratio of oxygen. The results showed that the addition of Cu-Ce mixed oxides improved CO oxidation reaction at lower temperature during stable lambda of 1, the highest CO conversion of 99% is observed for the noble metals (Pt, Pd, Rh) support on Cu-Ce with γ-Al2O3 washcoat/FeCrAl substrate. The results also showed that, the addition of Cu-Ce mixed oxides promoted released oxygen, thus it improved strongly CO and C3H8 conversion at lean oxygen stoichiometric operation. 展开更多
关键词 Three-Way Catalysts (TWCs) Noble Metals γ-Al2O3 Washcoat CuO-CeO2 CeO2-ZrO2
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