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Comparative study on water-soluble inorganic ions in PM2.5 from two distinct climate regions and air quality

Journal of Environmental Sciences 2020年第2期32卷 349-360页

作者： Duong huu Huy Le Tu Thanh To Thi Hien Norimichi Takenaka Faculty of Food Science and Technology Ho Chi Minh City University of Food Industry140 Le Trong Tan StreetTan Phu DistrictHo Chi Minh CityViet Nam Faculty of Environment University of ScienceVietnam National University–Ho Chi Minh City227 Nguyen Van Cu StreetDistrict 5Ho Chi Minh CityViet Nam Graduate School of Humanities and Sustainable System Sciences Osaka Prefecture University1-1 Gakuen-choNaka-kuSakai-shiOsaka 599-8531Japan

Recently, air quality has significantly improved in developed country, but that issue is of concern in emerging megacity in developing *** this study, aerosols and their precursor gas were collected by NILU filter pack at two distinct urban sites during the winter and summer in Osaka, Japan and dry and rainy seasons in Ho Chi Minh City(HCMC),*** aims are to investigate the contribution of water-soluble inorganic ions(WSIIs) to PM2.5, thermodynamic characterization and possible formation pathway of secondary inorganic aerosol(SIA).The PM2.5 concentration in Osaka(15.8 μg/m^3) is lower than that in HCMC(23.0 μg/m^3), but the concentration of WSIIs in Osaka(9.0 μg/m^3) is two times higher than that in HCMC(4.1 μg/m^3).Moreover, SIA including NH4^+, NO3^-and SO4^2-are major components in WSIIs accounting for 90% and 76%(in molar) in Osaka and HCMC,*** models were used to understand the thermodynamic characterization of urban ***, statistical analysis results indicate that very good agreement(R2> 0.8) was found for all species, except for nitrate aerosol in *** found that when the crustal species present at high amount, those compositions should be included in model calculation(*** the HCMC situation).Finally, we analyzed the characteristics of NH4^+– NO3^-– SO4^2-system.A possible pathway to produce fine nitrate aerosol in Osaka is via the homogeneous reaction between NH3 and HNO3, while nonvolatile nitrate aerosols can be formed by the heterogeneous reactions in HCMC.

关键词： Water-soluble inorganic ions Thermodynamic model PM2.5

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SOME PRELIMINARY RESULTS FROM STUDY OF CRUSTAL DEFORMATION IN VIETNAM

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大地测量与地球动力学 2003年第B12期23卷 114-118页

作者： Cao Dinh Trieu Le Van Dung nguyen huu Tuyen Pham Nam Hung Institute of Geophysics Institute of GeophysicsInstitute of GeophysicsInstitute of Geophysics 18 Hoang Quoc Viet Road Cau GiayHanoi18 Hoang Quoc Viet Road Cau GiayHanoi18 Hoang Quoc Viet Road Cau GiayHanoi18 Hoang Quoc Viet Road Cau GiayHanoi

In this work, the authors present some results of strain monitoring within the territory of Vietnam from 1984 to 2001. Data analysis shows that (1) the Phu Lien area is tectonically stable with low strain rate, 1×10\+\{-6\} /a; (2) the Hoa Binh area has indication of tectonic instability with relatively high strain rate of the earth crust: absolute value of the strain reaching 100×10\+\{-6\}, usual average strain amplitude of 60×10\+\{-6\}, whereas the monthly average strain intensity varies in a range from 30×10\+\{-6\} to 50×10\+\{-6\}; (3) there are clear indications of the strain state of the earth crust before occurrence of earthquakes of medium or higher magnitude. This is a very important indication in the research and short term prediction of earthquakes, especially for the areas with low seismic stability like the NW of Vietnam.

关键词：越南表层变形应变测量系统操作原则应变数据因变与地震相对关系地震活动特性

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基于基因表达编程和粒子群优化鲁棒混合计算模型的深部地下矿井岩爆分类

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土木与环境工程学报（中英文） 2023年第2期45卷 21-38页

作者： TRAN Quang-hieu BUI Xuan-Nam nguyen Hoang Department of Surface Mining Mining Faculty/Innovations for Sustainable and Responsible Mining(ISRM)Research GroupHanoi University of Mining and GeologyHanoi 100000Vietnam

在深部地下采矿中,岩爆因具有许多不利影响(如对人员、设备、隧道/地下矿山工作面和开采周期等的影响)而被视为不确定性风险。由于其不确定性的特征,对岩爆趋势的准确预测和分类具有一定难度,且已有研究成果较少。提出一种基于基因表达... 详细信息

在深部地下采矿中,岩爆因具有许多不利影响(如对人员、设备、隧道/地下矿山工作面和开采周期等的影响)而被视为不确定性风险。由于其不确定性的特征,对岩爆趋势的准确预测和分类具有一定难度,且已有研究成果较少。提出一种基于基因表达编程(GEP)和粒子群优化(PSO)的鲁棒混合计算模型GEP-PSO,用于预测和分类深部开口的岩爆趋势,提高了预测和分类的准确性。在建立GEP-PSO模型的过程中,评估GEP模型中不同数量的基因(1~4)和连接功能(例如,加法、提取、乘法和除法)。收集246次岩爆发生的地质和施工因素,用于建立岩爆分类的GEP-PSO模型;应用处理数据集缺失值的技术改进数据集的属性;用相关矩阵选取潜在输入参数的特征;建立13个混合GEP-PSO模型,得到各模型的精度。结果表明:在GEP结构中具有3个基因和乘法连接函数的GEP-PSO模型具有最高的准确度(80.49%)。将获得的最佳GEP-PSO模型的结果与基于相同数据集开发的各种已有模型进行比较,结果表明,选择的GEP-PSO模型结果优于已有模型,表明提出的GEP-PSO模型在岩爆等级的预测和分类方面的准确性显著提高,可以应用于深开挖工程中,以准确预测和评估岩爆敏感性。

关键词：岩爆 GEP-PSO模型地下采矿深开挖风险评估

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Improved flood susceptibility mapping using a best first decision tree integrated with ensemble learning techniques

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Geoscience Frontiers 2021年第3期12卷 333-342页

作者： Binh Thai Pham Abolfazl Jaafari Tran Van Phong Hoang Phan Hai Yen Tran Thi Tuyen Vu Van Luong huu Duy nguyen Hiep Van Le Loke Kok Foong University of Transport Technology Ha Noi 100000Viet Nam Research Institute of Forests and Rangelands Agricultural ResearchEducation and Extension Organization(AREEO)TehranIran Institute of Geological Sciences Vietnam Academy of Sciences and Technology84 Chua Lang StreetDong daHa NoiViet Nam Department of Geography School of Social EducationVinh UniversityViet Nam Department of Resource and Environment Management School of Agriculture and ResourcesVinh UniversityViet Nam Faculty of Geography VNU University of Science334 Nguyen TraiHa NoiViet Nam Institute of Research and Development Duy Tan UniversityDa Nang 550000Viet Nam Department for Management of Science and Technology Development Ton Duc Thang UniversityHo Chi Minh CityViet Nam Faculty of Civil Engineering Ton Duc Thang UniversityHo Chi Minh CityViet Nam

Improving the accuracy of flood prediction and mapping is crucial for reducing damage resulting from flood *** this study,we proposed and validated three ensemble models based on the Best First Decision Tree(BFT)and the Bagging(Bagging-BFT),Decorate(Bagging-BFT),and Random Subspace(RSS-BFT)ensemble learning techniques for an improved prediction of flood susceptibility in a spatially-explicit manner.A total number of 126 historical flood events from the Nghe An Province(Vietnam)were connected to a set of 10 flood influencing factors(slope,elevation,aspect,curvature,river density,distance from rivers,flow direction,geology,soil,and land use)for generating the training and validation *** models were validated via several performance metrics that demonstrated the capability of all three ensemble models in elucidating the underlying pattern of flood occurrences within the research area and predicting the probability of future flood *** on the Area Under the receiver operating characteristic Curve(AUC),the ensemble Decorate-BFT model that achieved an AUC value of 0.989 was identified as the superior model over the RSS-BFT(AUC=0.982)and Bagging-BFT(AUC=0.967)models.A comparison between the performance of the models and the models previously reported in the literature confirmed that our ensemble models provided a reliable estimate of flood susceptibilities and their resulting susceptibility maps are trustful for flood early warning systems as well as development of mitigation plans.

关键词： Machine learning Ensemble learners Hybrid modeling

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Influence of dietary mannan oligosaccharides supplementation on fingerling clownfish, Amphiprion ocellaris (Cuvier, 1830)

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Journal of Coastal Life Medicine 2017年第8期5卷 325-329页

作者： Hoang Do-huu Trung Kien nguyen Vietnam Academy of Science&Technology(VAST)-Institute of Oceanography 01 Cau DaNha TrangVietnam

Objective: To test the effects of dietary mannan oligosaccharides (MOS) on clownfish Amphiprion ocellaris (A. ocellaris). Methods: Six levels (0.5, 1.0, 1.5, 2.0, 2.5 and 3.0 g/kg diet) of MOS were added to the basal diet (used as control diet) and fed clownfish A. ocellaris [total length (24.21 ± 0.16) mm] for 70 days. Growth performance and tissue protein were measured. Results: The result showed that growth rate was enhanced significantly in fish fed 0.10% and 0.15% MOS in diets compared to fish fed other MOS levels or control (P < 0.05). Survival rate significantly increased in fish fed diets with 0.20% and 0.25% MOS, compared to control. Fraction rates of protein growth were significantly higher in fish fed diets with 0.15%, 0.20%and 0.25% MOS supplementation than those fish fed other MOS inclusion levels and the control (P < 0.04). Dietary MOS concentrations and clownfish growth rates were significantly correlated. Optimal MOS concentration was predicted to be 0.185%, 0.173% and 0.171% at Days 14, 42 and 70, respectively. Conclusions: In conclusion, MOS-supplemented diet benefits for boosting growth, survival and body composition of the clownfish, A. ocellaris.

关键词： Amphiprion ocellaris Clownfish Mannan oligosaccharides Growth Body composition

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Sensitivity of Lagrangian Particle Tracking Based on a 3D Numerical Model

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Journal of Modern Physics 2012年第12期3卷 1972-1978页

作者： Dang huu Chung nguyen Thi Kieu Duyen Institute of Mechanics Vietnamese Academy of Science and Technology Hanoi Vietnam

The aim of the paper is to investigate in detail the sensitivity of particles displacement based on method of Lagrangian particle tracking in combination with a 3D Eulerian numerical model that was developed by the first author, namely FSUM. The characteristic parameters used for this research include the possibilities of random movement, settling velocity of solid particle, horizontal and vertical diffusion coefficients and condition of particle fixed with a constant distance under water surface. The first part is on the fluid flow model. It includes 3D Navier-Stokes equations together with the initial and boundary conditions that were numerically solved with the finite difference method and coded with FORTRAN 90/95 using parallel technique with OpenMP. A semi-Lagrangian treatment of the advective terms was used. The second part is related to Lagrangian particle tracking model and was solved with the fourth Runge-Kutta method. Model was applied for Strait of Johor and has been calibrated by using measured data on water level and velocity at one station. Eight cases of simulations with many different options were carried out. Through computed cases it shows that random term and settling velocity are very important factors for the behavior of particle trajectory. Although the random diffusion is minor in comparison with flow velocity, but it can rearrange the initial distribution of particles then the cluster of particles become more dispersive during the process of movement. In addition, introducing settling velocity of particle makes a big change on the trajectory of particle that becomes more suitable to sediment transport. The study gave a comprehensive picture on particle movement. The model also showed its possibilities of multiform applications in simulation and prediction for the different problems in practice.

关键词： 3D FSUM Model Random Walk Settling Velocity Numerical Simulations

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Hydrogen roles approaching ideal electrical and optical properties for undoped and Al doped ZnO thin films

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Journal of Materiomics 2022年第1期8卷 123-135页

作者： Dung Van Hoang Nam Hoang Vu Nga Thi Do Anh Tuan Thanh Pham Truong huu nguyen Jer-Lai Kuo Thang Bach Phan Vinh Cao Tran Laboratory of Advanced Materials University of ScienceHoChiMinh City700000Viet Nam Vietnam National University HoChiMinh City700000Viet Nam HoChiMinh City Institute of Physics HoChiMinh City700000Viet Nam Institute of Atomic and Molecular Sciences Academia SinicaTaipei10617Taiwan Center for Innovative Materials and Architectures(INOMAR) HoChiMinh City700000Viet Nam Faculty of Materials Science&Technology University of ScienceHoChiMinh City700000Viet Nam

This paper distinguished hydrogen roles to improve electron mobility and carrier concentration in ZnO and Al doped ZnO sputtered *** combining experimental evidences and theoretical results,we find out that hydrogen located at oxygen vacancy sites(H_(O))is the main factor gives rise to increase simultaneously mobility and carrier concentration which has not been mentioned *** appropriate hydrogen content during sputtering not only results in crystalline relaxation but also supports doping Al into ZnO,increasing carrier concentration and electron mobility in the *** principles calculations confirmed hydrogen substitutional stability for oxygen vacancy,significantly reducing electron conductivity effective mass and hence increasing electron *** particular,0.8%hydrogen partial pressure ratio achieved 61 cm^(2)V^(-1)s^(-1)maximum electron mobility,optical transmittance above 82%in visible and near-infrared regions,and 2×10^(20) cm^(-3)carrier concentrations for H-Al co-doped ZnO *** values approach ideal electrical and optical properties for transparent conducting oxide *** presence of one maximum electron mobility was attributed to competition between increasing mobility due to restoring effective electron mass and hydrogen passivation of native defects,and decreased electron mobility due to electron-phonon scattering.

关键词： High electron mobility Hydrogen roles Passivation effects Effective electron mass DFT calculations Doped ZnO thin Film

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Tuning the crystal structure and optical properties of selective area grown InGaAs nanowires

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Nano Research 2022年第4期15卷 3695-3703页

作者： Zahra Azimi Aswani Gopakumar Amira SAmeruddin Li Li Thien Truong hieu Tnguyen Hark Hoe Tan Chennupati Jagadish Jennifer Wong-Leung Department of Electronic Materials Engineering Research School of PhysicsThe Australian National UniversityCanberra ACT 2601Australia Faculty of Applied Science and Technology Universiti Tun Hussein Onn MalaysiaBatu Pahat 86400Malaysia Australian National Fabrication Facility ACT Node Research School of PhysicsThe Australian National UniversityCanberra ACT 2601Australia School of Engineering The Australian National UniversityCanberra ACT 2601Australia Australian Research Council Centre of Excellence for Transformative Meta-Optical Systems Research School of PhysicsThe Australian National UniversityCanberra ACT 2601Australia

Catalyst-free InGaAs nanowires grown by selective area epitaxy are promising building blocks for future optoelectronic devices in the infrared spectral *** progress,the role of pattern geometry and growth parameters on the composition,microstructure,and optical properties of InGaAs nanowires is still ***,we present an optimised growth parameter window to achieve highly uniform In1-xGaxAs nanowire arrays on GaAs(111)B substrate over an extensive range of Ga concentrations,from 0.1 to 0.91,by selective-area metal-organic vapor-phase *** observe that the Ga content always increases with decreasing In/(Ga+In)precursor ratio and group V flow rate and increasing growth *** increase in Ga content is supported by a blue shift in the photoluminescence peak *** geometry of the nanowire arrays also plays an important role in the resulting ***,increasing the nanowire pitch size from 0.6 to 2μm in a patterned array shifts the photoluminescence peak emission by up to 120 *** of these growth and geometry parameters,the Ga content determines the crystal structure,resulting in a predominantly wurtzite structure for xGa≤0.3 and a predominantly zinc blende phase for xGa≥*** insights on the factors controlling the composition of InGaAs nanowires grown by a scalable catalyst-free approach provide directions for engineering nanowires as functional components of future optoelectronic devices.

关键词： InGaAs nanowires ternary semiconductors selective-area metal-organic vapor-phase epitaxy nanostructure pattern geometry

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Genetic variants of interferon regulatory factor 5 associated with chronic hepatitis B infection

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World Journal of Gastroenterology 2018年第2期24卷 248-256页

作者： Bui Tien Sy Nghiem Xuan Hoan Hoang Van Tong Christian G Meyer nguyen Linh Toan Le huu Song Claus-Thomas Bock Thirumalaisamy P Velavan Vietnamese-German Center of Excellence in Medical Research HanoiVietnam Institute of Clinical Infectious Diseases 108 Military Central HospitalHanoiVietnam Institute of Tropical Medicine University of TübingenTübingen 72074Germany Department of Infectious Diseases Robert Koch InstituteBerlin 13302Germany Department of Pathophysiology Vietnam Military Medical UniversityHanoiVietnam

AIM To investigate possible effects of IRF5 polymorphisms in the 3' UTR region of the IFR5 locus on susceptibilityto hepatitis B virus(HBV) infection and progression of liver diseases among clinically classified Vietnamese *** Four IFR5 SNPs(rs13242262 A/T, rs77416878 C/T, rs10488630 A/G, and rs2280714 T/C) were genotyped in clinically classified HBV patients [chronic hepatitis B(CHB). n = 99; liver cirrhosis(LC), n = 131; hepatocellular carcinoma(HCC), n = 149] and in 242 healthy controls by direct sequencing and Taq Man realtime PCR assays. RESULTS Comparing patients and controls, no significant association was observed for the four IFR5 variants. However, the alleles rs13242262 T and rs10488630 G contributed to an increased risk of liver cirrhosis(LC vs CHB: OR = 1.5, 95%CI: 1.1-2.3, adjusted P = 0.04; LC vs CHB: OR = 1.7, 95%CI: 1.1-2.6, adjusted P = 0.019). Haplotype IRF5*TCGT constructed from 4 SNPs was observed frequently in LC compared to CHB patients(OR = 2.1, 95%CI: 1.2-3.3, adjusted P = 0.008). Haplotype IRF5*TCAT occurred rather among CHB patients than in the other HBV patient groups(LC vs CHB: OR = 0.4, 95%CI: 0.2-0.8, adjusted P = 0.03; HCC vs CHB: OR = 0.3, 95%CI: 0.15-0.7, adjusted P = 0.003). The IRF5*TCAT haplotype was also associated with increased levels of ALT, AST and bilirubin. CONCLUSION Our study shows that IFR5 variants may contribute as a host factor in determining the pathogenesis in chronic HBV infections.

关键词： hepatitis B virus infection Liver diseases IRF5 IFR5 polymorphisms IFR5 haplotypes

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功率感知排序归并连接算法

功率感知排序归并连接算法

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作者： nguyen Trung hieu(阮忠孝) 浙江工业大学

学位级别：硕士

基于闪存的固态硬盘(SSD)作为一种新兴技术吸引了学术界和产业界的强烈兴趣。SSD已被广泛使用到笔记本电脑、台式机以及企业级服务器领域,渗透到市场的方方面面。SSD的一个独特优点是其内部并行性,如何利用固态盘内部并行性改进数据库... 详细信息

基于闪存的固态硬盘(SSD)作为一种新兴技术吸引了学术界和产业界的强烈兴趣。SSD已被广泛使用到笔记本电脑、台式机以及企业级服务器领域,渗透到市场的方方面面。SSD的一个独特优点是其内部并行性,如何利用固态盘内部并行性改进数据库操作性能是一个重要研究议题。另一方面,功率感知数据库系统的研究是数据库研究的要点之一。如何让数据库操作功率知晓是具有挑战性的议题。本文将对归并排序连接展开这两方面的研究。本文的贡献如下:1.研究固态硬盘的内在特征,并将这些知识应用于算法构建之中以改善性能;2.基于固态盘的内部并行性,实现一个有效的并行归并排序连接算法(PSMJ)。3.提出了一个系统级功率模型,称为软件功率计。根据硬件信息反馈,建立一个闭环功率控制器,通过调节处理器的功耗和限制PSMJ进程的功率来控制系统功率。实验结果表明,并行归并排序连接算法比传统方法更快更节能,能效提高了15%。闭环功率限制可以控制功耗在高密度功耗环境,不需要昂贵的硬件。

关键词：固态硬盘功率感知软功率计功率建模功率控制并行归并排序连接算法

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