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Investigation on cost-effective composites for CO_(2) adsorption from post-gasification residue and metal organic framework

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Journal of Environmental Sciences 2025年第2期148卷 174-187页

作者： Hong Nam nguyen Thu Phuong nguyen Phuong Thu Le Quang Minh Tran Thi Hai Do trung dung nguyen Phuong Lan Tran-nguyen Toshiki Tsubota Thi Mai Thanh Dinh University of Science and Technology of Hanoi Vietnam Academy of Science and Technology18 Hoang Quoc VietCau GiayHanoi 100000Vietnam Institute for Tropical Technology Vietnam Academy of Science and Technology18 Hoang Quoc VietCau GiayHanoi 100000Vietnam Faculty of Basic Science Hanoi University of Mining and Geology18 Pho VienDuc ThangNam Tu LiemHanoi 100000Vietnam Faculty of Physical and Chemical Engineering Le Quy Don Technical University236 Hoang Quoc VietBac Tu LiemHanoi 100000Vietnam Department of Mechanical Engineering Can Tho University3/2 streetCan Tho City 94000Vietnam Department of Engineering Graduate School of EngineeringKyushu Institute of Technology1-1 SensuichoTobata-kuKitakyushuFukuoka 804-8550Japan

Cost-effective CO_(2) adsorbents are gaining increasing attention as viable solutions for mitigating climate *** this study,composites were synthesized by electrochemically combining the post-gasification residue of Macadamia nut shell with copper benzene-1,3,5-tricarboxylate(CuBTC).Among the different composites synthesized,the ratio of 1:1 between biochar and CuBTC(B 1:1)demonstrated the highest CO_(2) adsorption *** controlled laboratory conditions(0°C,1 bar,without the influence of ambient moisture or CO_(2) diffusion limitations),B 1:1 achieved a CO_(2) adsorption capacity of 9.8 mmol/g,while under industrial-like conditions(25℃,1 bar,taking into account the impact of ambient moisture and CO_(2) diffusion limitations within a bed of adsorbent),it reached 6.2 mmol/*** values surpassed those reported for various advanced CO_(2) adsorbents investigated in previous *** superior performance of the B 1:1 composite can be attributed to the optimization of the number of active sites,porosity,and the preservation of the full physical and chemical surface properties of both ***,the composite exhibited a notable CO_(2)/N_(2) selectivity and improved stability under moisture *** favorable characteristics make B 1:1 a promising candidate for industrial applications.

关键词： Biochar-based composites CO_(2)adsorption CuBTC Metal organic framework Post-gasification residue

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Stress relaxation analysis of single chondrocytes using porohyperelastic model based on AFM experiments

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Theoretical & Applied Mechanics Letters 2014年第5期4卷 74-80页

作者： trung dung nguyen Adekunle Oloyede Yuantong Gu School of Chemistry Physics and Mechanical EngineeringScience and Engineering FacultyQueensland University of Technology

Based on atomic force microscopy technique, we found that the chon- drocytes exhibits stress relaxation behavior. We explored the mechanism of this stress relaxation behavior and concluded that the intracellular fluid exuding out from the cells during deformation plays the most important role in the stress relax- ation. We applied the inverse finite element analysis technique to determine nec- essary material parameters for porohyperelastic （PHE） model to simulate stress relaxation behavior as this model is proven capable of capturing the non-linear behavior and the fluid-solid interaction during the stress relaxation of the single chondrocytes. It is observed that PHE model can precisely capture the stress re- laxation behavior of single chondrocytes and would be a suitable model for cell biomechanics.

关键词： cell biomechanics chondrocytes atomic force microscopy stress relaxation,porohyperelastic (PHE) constitutive model

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Privacy-preserving explainable AI: a survey

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Science China(Information Sciences) 2025年第1期68卷 23-56页

作者： Thanh Tam nguyen Thanh trung HUYNH Zhao REN Thanh Toan nguyen Phi Le nguyen Hongzhi YIN Quoc Viet Hung nguyen School of Information and Communication Technology Griffith University School of Computer and Communication Sciences Ecole Polytechnique Federale de Lausanne Faculty of Mathematics and Computer Science University of Bremen Faculty of Information Technology HUTECH University Department of Computer Science Hanoi University of Science and Technology School of Electrical Engineering and Computer Science The University of Queensland

As the adoption of explainable AI(XAI) continues to expand, the urgency to address its privacy implications intensifies. Despite a growing corpus of research in AI privacy and explainability, there is little attention on privacy-preserving model explanations. This article presents the first thorough survey about privacy attacks on model explanations and their countermeasures. Our contribution to this field comprises a thorough analysis of research papers with a connected taxonomy that facilitates the categorization of privacy attacks and countermeasures based on the targeted explanations. This work also includes an initial investigation into the causes of privacy leaks. Finally, we discuss unresolved issues and prospective research directions uncovered in our analysis. This survey aims to be a valuable resource for the research community and offers clear insights for those new to this domain. To support ongoing research, we have established an online resource repository, which will be continuously updated with new and relevant findings.

关键词： privacy-preserving explainable AI privacy attacks privacy defences PrivEx PPXAI

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Predictive value of tacrolimus concentration/dose ratio in first posttransplant week for CYP3A5-polymorphism in kidney-transplant recipients

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World Journal of Transplantation 2025年第2期15卷 197-204页

作者： Pham-Thai dung Hoang-Xuan Su nguyen-Chi Tue nguyen-Huu Ben nguyen-Minh Phuong Tuan-Ngoc Tran Phan-Ba Nghia Diem-Thi Van nguyen Thi-Thuy dung Hoang-trung Vinh Lionel Rostaing Pham-Quoc Toan Center of Critical Care Medicine Emergency and Clinical ToxicologyMilitary HospitalHanoï100000Viet Nam Institute of Biomedicine and Pharmacy Vietnam Military Medical UniversityHanoï100000Viet Nam Department of Post-Transplant Intensive Care and Treatment Center of Organ Transplantation-Military HospitalHanoï100000Viet Nam Department of Occupational Medicine Vietnam Military Medical UniversityHanoï100000Viet Nam Department of Military Medical Command and Organization Vietnam Military Medical UniversityHanoï100000Viet Nam Department of Nephrology and Dialysis Military HospitalHanoï100000Viet Nam Department of Nephrology HemodialysisApheresisand Kidney TransplantationGrenoble University HospitalGrenoble 38043Auvergne-Rhone-AlpesFrance

BACKGROUND Tacrolimus(TAC)is metabolized primarily by the CYP3A-encoded enzyme family(CYP3A4,CYP3A5,and CYP3A7).Individuals expressing the CYP3A51 allele are considered fast metabolizers and generally require higher TAC doses to reach therapeutic *** To evaluate the predictive value of the TAC concentration-to-dose(C0/D)ratio for identifying CYP3A5 poly-morphisms in renal transplant *** Eighty-six de novo kidney transplant recipients with TAC-based immunosuppression from the Department of Nephrology and Dialysis at Military Hospital 103(Hanoi,Vietnam)were included in this retrospective *** samples were collected within the first week post-transplantation to monitor TAC levels and to perform genotyping for CYP3A5 genetic *** The CYP3A53/3 genotype was identified in 37 patients(43%),CYP3A51/3 in 40 patients(46.5%),and CYP3A51/1 in 9 patients(10.5%).Patients carrying the CYP3A51/3 or CYP3A51/1 genotype,classified as fast metabolizers(CYP3A5 expressers),had significantly lower TAC C0 concentrations and C0/D ratios compared to slow meta-bolizers(CYP3A53/3 genotype)at multiple time points during follow-up(all P<0.001).Notably,the TAC C0/D ratio obtained on day 1(0.91)was shown to predict CYP3A5 polymorphism with a sensitivity of 84.6%and a specificity of 84.6%.CONCLUSION This study demonstrates that the TAC C0/D ratio provides a reliable predictive value for CYP3A5 polymorphisms,which can be used to individualize TAC dosing in renal transplant recipients in Vietnam and other low-income countries.

关键词： Tacrolimus CYP3A5 Renal transplant recipient Concentration-to-dose Kidney transplant

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High-thermal free vibration analysis of functionally graded microplates using a new finite element formulation based on TSDT and MSCT

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Defence Technology(防务技术) 2025年第2期44卷 131-149页

作者： Huu Trong Dang Nhan Thinh Hoang Quoc Hoa Pham trung Thanh Tran Huy Gia Luong Faculty of Mechanical Engineering Technology Vinh Long University of Technology EducationVinh Long 91000Viet Nam Institute for Creative Design and Business Nguyen Tat Thanh UniversityHo Chi Minh City 70000Viet Nam Faculty of Engineering and Technology Nguyen Tat Thanh UniversityHo Chi Minh City 70000Viet Nam Faculty of Mechanical Engineering Le Quy Don Technical UniversityHanoi 10000Viet Nam TechnoStar Vietnam TechnoStar Co.LtdHo Chi Minh City 70000Viet Nam

Recent advancements in additive manufacturing(AM)have revolutionized the design and production of complex engineering *** these advancements,their mathematical modeling and computational analysis remain significant *** research aims to develop an effective computational method for analyzing the free vibration of functionally graded(FG)microplates under high temperatures while resting on a Pasternak foundation(PF).This formulation leverages a new thirdorder shear deformation theory(new TSDT)for improved accuracy without requiring shear correction ***,the modified couple stress theory(MCST)is incorporated to account for sizedependent effects in *** PF is characterized by two parameters including spring stiffness(k_(w))and shear layer stiffness(k_(s)).To validate the proposed method,the results obtained are compared with those of the existing ***,numerical examples explore the influence of various factors on the high-temperature free vibration of FG *** factors include the length scale parameter(l),geometric dimensions,material properties,and the presence of the elastic *** findings significantly enhance our comprehension of the free vibration of FG microplates in high thermal *** addition,the findings significantly enhance our comprehension of the free vibration of FG microplates in high thermal *** addition,the results of this research will have great potential in military and defense applications such as components of submarines,fighter aircraft,and missiles.

关键词： Microplates Functionally graded material Finite element method Modified couple stress theory New TSDT High-thermal free vibration Pasternak foundation

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Orange G degradation by heterogeneous peroxymonosulfate activation based on magnetic MnFe_(2)O_(4)/α-MnO_(2) hybrid

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Journal of Environmental Sciences 2023年第2期124卷 379-396页

作者： Le Thi Thao To Van nguyen Van Quy nguyen Ngoc Man Phan Ki Jae Kim nguyen Nhat Huy nguyen trung dung Faculty of Physical and Chemical Engineering Le Quy Don Technical UniversityHanoi 100000Vietnam Department of Energy Engineering Konkuk UniversitySeoul 05029Korea School of Chemical Engineering College of EngineeringSungkyunkwan UniversityJangan-guSuwon 16419Korea Faculty of Environment and Natural Resources Ho Chi Minh City University of Technology(HCMUT)Ho Chi Minh City 700000Vietnam Vietnam National University Ho Chi Minh City Linh Trung WardThu Duc CityHo Chi Minh City 700000Vietnam

Wastewater containing an azo dye Orange G(OG)causes massive environmental pollution,thus it is critical to develop a highly effective,environmental-friendly,and reusable catalyst in peroxymonosulfate(PMS)activation for OG *** this work,we successfully applied a magnetic MnFe_(2)O_(4)/α-MnO_(2) hybrid fabricated by a simple hydrothermal method for OG removal in *** characteristics of the hybrid were investigated by Xray diffraction,scanning electron microscopy,energy-dispersive X-ray spectroscopy,Fourier transform infrared spectroscopy,Brunauer–Emmett–Teller method,vibrating sample magnetometry,electron paramagnetic resonance,thermogravimetric analysis,and X-ray photoelectron *** effects of operational parameters(i.e.,catalytic system,catalytic dose,solution pH,and temperature)were *** results exhibited that 96.8% of OG degradation was obtained with MnFe_(2)O_(4)/α-MnO2(1:9)/PMS system in 30 min regardless of solution pH ***,the possible reaction mechanism of the coupling system was proposed,and the degradation intermediates of OG were identified by mass *** radical quenching experiments and EPR tests demonstrated that SO_(4)•̶,O_(2)•̶,and 1O2 were the primary reactive oxygen species responsible for the OG *** hybrid also displayed unusual stability with less than 30%loss in the OG removal after four sequential ***,magnetic MnFe2O4/α-MnO2 hybrid could be used as a high potential activator of PMS to remove orange G and maybe other dyes from wastewater.

关键词： MnFe_(2)O_(4)/α-MnO_(2) Peroxymonosulfate Orange G Catalytic degradation Reusability

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ITÔDIFFERENTIAL REPRESENTATION OF SINGULAR STOCHASTIC VOLTERRA INTEGRAL EQUATIONS

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Acta Mathematica Scientia 2020年第6期40卷 1989-2000页

作者： nguyen Tien dung Division of Computational Mathematics and Engineering Institute for Computational ScienceTon Duc Thang UniversityHo Chi Minh CityVietnam Faculty of Mathematics and Statistics Ton Duc Thang UniversityHo Chi Minh CityVietnam

In this paper we obtain an Itôdifferential representation for a class of singular stochastic Volterra integral *** an application,we investigate the rate of convergence in the small time central limit theorem for the ... 详细信息

关键词： stochastic integral equation Itôformula central limit theorem

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Asymptotic Expansions of Backward Equations for Two-time-scale Markov Chains in Continuous Time

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Acta Mathematicae Applicatae Sinica 2009年第3期25卷 457-476页

作者： dung Tien nguyen Department of Mathematics Wayne State University

This work develops asymptotic expansions for solutions of systems of backward equations of time- inhomogeneous Maxkov chains in continuous time. Owing to the rapid progress in technology and the increasing complexity in modeling, the underlying Maxkov chains often have large state spaces, which make the computa- tional tasks ihfeasible. To reduce the complexity, two-time-scale formulations are used. By introducing a small parameter ε〉 0 and using suitable decomposition and aggregation procedures, it is formulated as a singular perturbation problem. Both Markov chains having recurrent states only and Maxkov chains including also tran- sient states are treated. Under certain weak irreducibility and smoothness conditions of the generators, the desired asymptotic expansions axe constructed. Then error bounds are obtained.

关键词： Markov chain backward equation two-time scale asymptotic expansion

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ASYMPTOTIC BEHAVIOR OF LINEAR ADVANCED DIFFERENTIAL EQUATIONS

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Acta Mathematica Scientia 2015年第3期35卷 610-618页

作者： nguyen Tien dung Department of Mathematics FPT University 8 Ton That ThuyetMy DinhTu LiemHanoiVietNam

In this article, we consider a general class of linear advanced differential equa- tions, and obtain explicitly sufficient conditions of convergence and exponential convergence to zero. A necessary condition is provid... 详细信息

关键词： Advanced differential equations asymptotic behaviors fixed points

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A novel finite element formulation for static bending analysis of functionally graded porous sandwich plates

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Frontiers of Structural and Civil Engineering 2022年第12期16卷 1599-1620页

作者： Van Chinh nguyen trung Thanh TRAN trung nguyen-THOI Quoc-Hoa PHAM Faculty of Mechanical Engineering Le Quy Don Technical UniversityHanoiVietnam Laboratory for Applied and Industrial Mathematics Institute for Computational Science and Artificial IntelligenceVan Lang UniversityHo Chi Minh CityVietnam Faculty of Mechanical-Electrical and Computer Engineering Van Lang UniversityHo Chi Minh CityVietnam Faculty of Engineering and Technology Nguyen Tat Thanh UniversityHo Chi Minh CityVietnam

This article aims to propose a finite element formulation based on Quasi-3D theory for the static bending analysis of functionally graded porous(FGP)sandwich *** FGP sandwich plates consist of three layers including the bottom skin of homogeneous metal,the top skin of fully ceramic and the FGP core layer with uneven porosity distribution.A quadrilateral(Q4)element with nine degrees of freedom(DOFs)per node is derived and employed in analyzing the static bending response of the plate under uniform and/or sinusoidally distributed *** accuracy of the present finite element formulation is verified by comparing the obtained numerical results with the published results in the ***,some numerical examples are performed to examine the effects of the parameters including power-law index k and porosity coefficient on the static bending response of rectangular FGP sandwich *** addition,a problem with a complicated L-shape model is conducted to illustrate the superiority of the proposed finite element method.

关键词： sandwich plates functionally graded porous static bending Quasi-3D theory Q4 element

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