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Liouvillian Solutions of Algebraic Ordinary Differential Equations of Order One of Genus Zero

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Journal of Systems Science & Complexity 2023年第2期36卷 884-893页

作者： nguyen tri Dat NGO Lam Xuan Chau Faculty of Basic Science Ho Chi Minh City University of TransportHo Chi Minh CityVietnam Department of Mathematics and Statistics Quy Nhon UniversityQuy Nhon CityVietnam

This paper considers the class of autonomous algebraic ordinary differential equations(AODEs)of order one,and studies their Liouvillian general *** particular,let F(y,w)=0 be a rational algebraic curve over *** authors give necessary and sufficient conditions for the autonomous first-order AODE F(y,y′)=0 to have a Liouvillian solution over ***,the authors show that a Liouvillian solutionαof this equation is either an algebraic function over C(x)or an algebraic function over C(exp(ax)).As a byproduct,these results lead to an algorithm for determining a Liouvillian general solution of an autonomous AODE of order one of genus *** parametrizations of rational algebraic curves play an important role on this method.

关键词： Algebraic ordinary differential equation autonomous differential equation Liouvillian solution rational algebraic curve rational parametrizations

The Roles of Female Involvement and Risk Aversion in Open Access Publishing Patterns in Vietnamese Social Sciences and Humanities

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Journal of Data and Information Science 2022年第1期7卷 76-96页

作者： minh-Hoang nguyen Huyen Thanh Thanh nguyen Manh-Toan Ho Tam-tri Le Quan-Hoang Vuong Centre for Interdisciplinary Social Research Phenikaa UniversityYen Nghia WardHa Dong DistrictHanoi 100803Vietnam

Purpose:The open-access(OA)publishing model can help improve researchers’outreach,thanks to its accessibility and visibility to the ***,the presentation of female researchers can benefit from the O A publishing *** that,little is known about how gender affects OA ***,the current study explores the effects of female involvement and risk aversion on OA publishing patterns among Vietname se social sciences and ***/methodology/approach:The study employed Bayesian Mindsponge Framework(BMF)on a dataset of 3,122 Vietnamese social sciences and humanities(SS&H)publications during *** Mindsponge mechanism was specifically used to construct theoretical models,while Bayesian inference was utilized for fitting ***:The result showed a positive association between female participation and OA publishing ***,the positive effect of female involvement on OA publishing probability was negated by the high ratio of female researchers in a *** status was negatively associated with the JIF of the journal in which the publication was published,but the relationship was moderated by the involvement of a female researcher(s).The findings suggested that Vietnamese female researchers might be more likely to publish under the OA model in journals with high JIF for avoiding the risk of public *** limitations:The study could only provide evidence on the association between female involvement and OA publishing ***,whether to publish under OA terms is often determined by the first or corresponding authors,but not necessarily *** implications:Systematically coordinated actions are suggested to better support women and promote the OA movement in ***/value:The findings show the OA publishing patterns of female researchers in Vietnamese SS&H.

关键词： Open science Gender inequality Risk-aversion Vietnam Bayesian analysis

A Multinational Data Set of Game Players' Behaviors in a Virtual World and Environmental Perceptions

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Data Intelligence 2021年第4期3卷 606-629页

作者： Quan-Hoang Vuong Manh-Toan Ho Viet-Phuong La Tam-tri Le Thanh Huyen T.nguyen minh-Hoang nguyen Centre for Interdisciplinary Social Research Phenikaa UniversityYen Nghia WardHa Dong DistrictHanoi 100803Vietnam A.I.for Social Data Lab Vuong&AssociatesDong Da DistrictHanoi 100000Vietnam

Video gaming has been rising rapidly to become one of the primary entertainment media,especially during the COVID-19 *** video games has been reported to associate with many psychological and behavioral ***,little is known about the connections between game players’behaviors in the virtual environment and environmental ***,the current data set offers valuable resources regarding environmental worldviews and behaviors in the virtual world of 640 Animal Crossing:New Horizons(ACNH)game players from 29 countries around the *** data set consists of six major categories:1)socio-demographic profile,2)COVID-19 concern,3)environmental perception,4)gameplaying habit,5)in-game behavior,and 6)game-playing *** making this data set open,we aim to provide policymakers,game producers,and researchers with valuable resources for understanding the interactions between behaviors in the virtual world and environmental perceptions,which could help produce video games in compliance with the United Nations(UN)Sustainable Development Goals.

关键词： Environmental psychology Virtual environment Game-playing behaviors Multinational UN compliance design

3D modeling of transformation of gaseous pollutants in the high-pressure turbine of an aircraft engine

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Propulsion and Power Research 2020年第1期9卷 1-14页

作者： Trung Hieu nguyen Phuong nguyen-tri Francois Garnier Department of Mechanical Engineering École de Technologie Supérieure(ETS)MontrealQuebecH3C 1K3Canada Institute of Research and Development Duy Tan UniversityDa Nang550000Viet Nam Department of Chemistry Biochemistry and PhysicsUniversitédu QuébecàTrois-RivièresUniversity of QuebecTrois-Rivières(Québec)G9A 5H7Canada

Aircraft emissions contribute to global climate change and regional air pollution near *** the formation and the transformation of emissions in the aircraft engine is essential to properly quantify the environmental impact and air ***,precise investigation of chemical process in the turbine is challenging because of the complexity of the transformation process in the complex flow relating to the moving blade at high temperature and high *** present here,the first published model study of 3D chemical formations inside a high-pressure turbine and first time to compare three numerical solutions(1D,2D and 3D calculations)of transformation of trace species inside an aircraft *** model has simulated the evolution of principal precursor pollutant gases(NOx and SOx)and other species(hydrogen,oxygen species and carbon oxides).Our results also indicated strong dissimilarities in chemical transformations of 3D *** comparing the three solutions,the results obtained showed that the difference of mole fractions of species can be under predicted by 75%between 1D and 2D calculations and in the comparison of 2D and 3D calculation,the under predicted difference may be 90%.

关键词： Gaseous pollutants High-pressure turbine Aircraft engine 3D modeling

One-loop contributions for h→ℓℓγ and e−e+→hγ in the U(1)_(B−L) extension of the standard model

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Chinese Physics C 2024年第5期48卷 23-49页

作者： Tran Dzung tri Thanh Huy nguyen Khiem Hong Phan Institute of Fundamental and Applied Sciences Duy Tan UniversityHo Chi Minh City 700000Vietnam Faculty of Natural Sciences Duy Tan UniversityDa Nang City 550000Vietnam VNUHCM-University of Science 227 Nguyen Van CuDistrict 5Ho Chi Minh CityVietnam

We present one-loop contributions for h→ℓℓγ with ℓ=νe,μ,τ,e,μ and e−e+→hγ in the U(1)_(B−L) extension of the standard model. In the phenomenological results, the signal strengths for h→ℓℓγ at the Large Hadron Collider and for e−e+→hγ at future lepton colliders are analyzed in the physical parameter space for both the vector and chiral B−L models. We found that the contributions from the neutral gauge boson Z′ to the signal strengths are rather small. Consequently, the effects will be difficult to probe at future colliders. However, the impacts of charged Higgs and CP-odd Higgs in the chiral B−L model on the signal strengths are significant and can be measured with the help of the initial polarization beams at future lepton colliders.

关键词： Higgs phenomenology one-loop Feynman integrals analytic methods for quantum field theory dimensional regularization future lepton colliders

Discrete-time sliding mode control with power rate exponential reaching law of a pneumatic artificial muscle system

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Control Theory and Technology 2022年第4期20卷 514-524页

作者： Quy-Thinh Dao Trung-Kien Le tri Van-Anh nguyen Manh-Linh nguyen School of Electrical and Electronic Engineering Hanoi University of Science and TechnologyDai Co VietHanoi 11615Vietnam

This paper develops a discrete-time sliding mode controller with a power rate exponential reaching law approach to enhance the performance of a pneumatic artificial muscle system in both reaching time and chattering *** proposed method dynamically adapts to the variation of the switching function,which is based on an exponential term and a power rate term of the sliding ***,the controlled system can achieve high tracking performance while still obtain chattering-free ***,the effectiveness of the proposed method is validated through multiple experimental tests,focused on a dual pneumatic artificial muscle ***,experimental results show the effectiveness of the proposed approach in this paper.

关键词： Pneumatic artificial muscle Discrete-time sliding mode control Exponential reaching law Chattering

Machine learning for integrating combustion chemistry in numerical simulations

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Energy and AI 2021年第3期5卷 330-338页

作者： Huu-tri nguyen Pascale Domingo Luc Vervisch Phuc-Danh nguyen CORIA-CNRS Normandie UniversitéINSA Rouen NormandieSaint-Etienne-du-Rouvray 76801France ArcelorMittal Global Research and Development Maiziéres-lés-Metz 57280France

A strategy based on machine learning is discussed to close the gap between the detailed description of combustion chemistry and the numerical simulation of combustion ***,the partial differential equations describ-ing chemical kinetics are stiffand involve many degrees of freedom,making their solving in three-dimensional unsteady simulations very *** is discussed in this work how a reduction of the computing cost by an order of magnitude can be achieved using a set of neural networks trained for solving *** ther-mochemical database used for training is composed of time evolutions of stochastic particles carrying chemical species mass fractions and temperature according to a turbulent micro-mixing problem coupled with complex *** novelty of the work lies in the decomposition of the thermochemical hyperspace into clusters to facilitate the training of neural *** decomposition is performed with the Kmeans algorithm,a local principal component analysis is then applied to every *** new methodology for combustion chemistry reduction is tested under conditions representative of a non-premixed syngas oxy-flame.

关键词： Combustion chemistry Micro-mixing modeling Principal component analysis Artificial neural network Chemistry reduction

Comparative Study on Sino-Vietnam Cybersecurity Legislation and Regional Cooperation

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Comparative Study on Sino-Vietnam Cybersecurity Legislation ...

作者： nguyen Phuoc Bao tri 西南政法大学

学位级别：硕士

如今,公共生活的各个领域,包括文化,娱乐,商业和学术研究在内的各个不同的行业,都因为新技术的出现而产生了彻底的变革。信息科技的发展更是成为了全球共同关注的论题。信息与数据时代的到来,显著促进了商业,教育,医疗,政治等社会方面... 详细信息

如今,公共生活的各个领域,包括文化,娱乐,商业和学术研究在内的各个不同的行业,都因为新技术的出现而产生了彻底的变革。信息科技的发展更是成为了全球共同关注的论题。信息与数据时代的到来,显著促进了商业,教育,医疗,政治等社会方面的改善与进步。然而,伴随着信息化社会的急速发展以及网络空间的迅速膨胀,新的问题也随之涌现。尽管数字化时代所具有的优势无可非议,其派生的问题同时也不容忽视,其中的网络安全问题便正为立法者及专家密切关注。同时,网络安全问题的频繁发生、复杂性和影响也使问题本身更加严峻,尤其是在诸如越南这样的发展中国家之中。同其他国家相似,越南的网络发展也极为迅速。因此,越南政府正着手探索法律手段以保护网络安全。本文包括四个主要部分论文的第一部分简要介绍了网络空间的本质,同时论述了网络安全的必要性,以便了解网络空间中的潜在危险。此外,网络犯罪中的犯罪分子构成的危险与传统犯罪所能带来的危害极为不同。因此,第二部分旨在介绍网络犯罪的法律问题。根据犯罪目的的不同将各种网络犯罪分成易于管理的类别促进了国内法和国际法的发展,使得其可以通过判断犯罪行为归属的类别,行使统一化的法律手段来规定个人或者国家的权利义务。当前网络犯罪已然成为任何发展中国家的频发问题,而此项措施可以有效裨补在当前的国内法和国际法框架中存在的缺漏。第三,越南的信息通信技术行业(ICT)已于2000年走上加速发展和相对全面发展的道路,此项行业主要由政府政策进行支持和推动。越南致力于信息社会发展,并争取在2020年前使信息成就高于东南亚平均水平。虽然越南在信息通信技术和数字领域展现出巨大潜力,但若通过充分利用资源以期实现上述宏伟目标,越南仍然面临着诸多困难和挑战。管理网络安全的问题是越南面临的主要挑战之一。在意识到网络空间的脆弱性同时,越南政府已着手制定并实施新的网络安全政策。因此,作为本文的第三部分,笔者将通过论述网络发展历程,机构监管机制和政府的法律措施三个方面来评估并分析越南的网络安全现状。在第四部分,笔者以中国作为比较研究的对象,这是因为中国将网络安全政策视为一项优先政策。此外,笔者参加了中国-东盟法律研究中心的项目,而此项目正是于中国开展。参与此项目的各国家研究人员在研究的基础上构筑合作平台,其中网络安全相关法律问题便是其中一重要论题。近年来,中国与东盟之间的合作发展迅速,但是在贸易依赖网络的今天,网络安全机制的缺乏可能导致巨大的经济损失。越南和中国互为邻国,有着相同的政治体系和法律体系,双方自国家独立之日起便建立了友好关系。因此,探索中国和越南之间的网络安全合作的可能性,将为双方在网络安全领域寻求与发展跨境合作提供有效途径。

关键词：网络安全网络信息安全国家安全互联网跨境服务中越网络安全合

Photocatalytic degradation of antibiotic sulfamethizole by visible light activated perovskite LaZnO_(3)

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Journal of Environmental Sciences 2024年第10期144卷 212-224页

作者： Bui The Huy XCuong nguyen Vu Khac Hoang Bui nguyen Ngoc tri Iqra Rabani Nhu Hoa Thi Tran Quang Viet Ly Hai Bang Truong Major of Biomedical Engineering Division of Smart HealthcareCollege of Information Technology and ConvergencePukyong National UniversityBusan 48513Korea Center for Advanced Chemistry Institute of Research and DevelopmentDuy Tan UniversityDa Nang 550000Viet Nam Faculty of Environmental and Chemical Engineering Duy Tan UniversityDa Nang 550000Viet Nam Department of Environment and Energy Sejong UniversitySeoul 05006Korea Lab of Computational Chemistry and Modelling Department of ChemistryFaculty of Natural SciencesQuy Nhon UniversityQuy NhonViet Nam Department of Nanotechnology and Advanced Materials Engineering Sejong UniversitySeoul 05006Korea Faculty of Materials Science and Technology University of ScienceHo Chi Minh City 700000Viet Nam Vietnam National University Ho Chi Minh City 700000Viet Nam Department of Environmental Engineering Seoul National University of Science and TechnologySeoul 01811Korea Optical Materials Research Group Science and Technology Advanced InstituteVan Lang UniversityHo Chi Minh CityViet Nam Faculty of Applied Technology School of TechnologyVan Lang UniversityHo Chi Minh CityViet Nam

In thiswork,the perovskite LaZnO_(3) was synthesized via sol-gel method and applied for photocatalytic treatment of sulfamethizole(SMZ)antibiotics under visible light *** was almost completely degraded(99.2%±0.3%)within 4 hr by photocatalyst LaZnO_(3) at the optimal dosage of 1.1 g/L,with amineralization proportion of 58.7%±0.4%.The efficient performance of LaZnO_(3) can be attributed to itswide-range light absorption and the appropriate energy band edge levels,which facilitate the formation of active agents such as·O_(2)^(−),h^(+),and·*** integration of RP-HPLC/Q-TOF-MS and DFT-based computational techniques revealed three degradation pathways of SMZ,which were initiated by the deamination reaction at the aniline ring,the breakdown of the sulfonamidemoieties,and a process known as Smile-type rearrangement and SO2 *** toxicity of SMZ and the intermediateswere analyzed by quantitative structure activity relationship(QSAR),indicating the effectiveness of LaZnO_(3)-based photocatalysis in preventing secondary pollution of the intermediates to the ecosystem during the degradation *** visible-light-activated photocatalyst LaZnO_(3) exhibited efficient performance in the occurrence of inorganic anions and maintained high durability across multiple recycling tests,making it a promising candidate for practical antibiotic treatment.

关键词： Perovskite Antibiotics Photocatalysis Density functional theory Toxicity