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Defect engineering of water-dispersible g-C_(3)N_(4) photocatalysts by chemical oxidative etching of bulk g-C_(3)N_(4) prepared in different calcination atmospheres

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Journal of Materials Science & Technology 2022年第8期103卷 232-243页

作者： Thi Kim anh nguyen Thanh-Truc Pham Bolormaa Gendensuren Eun-Suok Oh Eun Woo Shin School of Chemical Engineering University of UlsanDaehakro 93Ulsan 44610South Korea Department of Material Technology Faculty of Applied ScienceHo Chi Minh City University of Technology and Education(HCMUTE)No.1 Vo Van Ngan StreetLinh Chieu WardThu Duc DistrictHo Chi Minh City 700000Viet Nam

In this study,water-dispersible graphitic carbon nitride(g-C_(3)N_(4))photocatalysts were successively prepared through the chemically oxidative etching of bulk g-C_(3)N_(4) that was polymerized thermally in different calcination atmospheres such as air,CO_(2),and N_(2).The different calcination atmospheres directly influenced the physicochemical and optical properties of both bulk and water-dispersible g-C_(3)N_(4),changing the photocatalytic degradation behavior of methylene blue(MB)and tetracycline hydrochloride(TCHCl)for water-dispersible g-C_(3)N_(4).The bubble-burst process in the thermal polymerization of thiourea produced defective edges containing C=O groups that preferred substituting the C-NHx groups over bulk g-C_(3)N_(4).In the oxygen-free N_(2) atmosphere among the different calcination atmospheres,more C=O functional groups were generated on the defective edges of bulk g-C_(3)N_(4),resulting in the highest N vacancy of the tri-s-triazine *** the successive chemical oxidation,S-or O-containing functional groups were introduced onto water-dispersible g-C_(3)N_(4).The water-dispersible g-C_(3)N_(4) photocatalyst from the oxygen-free N_(2) atmosphere(NTw)contained the most O-and S-functional groups on the g-C_(3)N_(4) ***,NTw exhibited the highest photocatalytic activity in the MB and TC-HCl photodegradation because of its slowest recombination process,which was ascribed to the unique surface properties of NTw such as abundant functional groups on the defective edges and N-deficient property.

关键词： g-C_(3)N_(4) Water-dispersible photocatalyst Calcination atmosphere Charge separation Chemically oxidative etching Defect edges

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Piaoac Granites Related W-Sn Mineralization, Northern Vietnam: Evidences from Geochemistry, Zircon Geochronology and Hf Isotopes

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Journal of Earth Science 2019年第1期30卷 52-69页

作者： Tuan anh nguyen Xiaoyong Yang Hien Vu Thi Lei Liu Insung Lee School of Earth and Space Sciences University of Science and Technology of China Institute of Geological Sciences Vietnam Academy of Science and Technology(VAST) Department of Geology Hanoi University of Mining and Geology School of Earth and Environmental Sciences Seoul National University

Piaoac granites exposed in the Cao Bang region, northern Vietnam, are S-type granite, which are associated with W-Sn-Mo-Be-F mineralization. Zircon U-Pb ages, major and trace elements, mineral chemical and Hf isotopic compositions of the W-Sn-bearing granites from the Piaoac District have been investigated in detail. LA-ICP-MS U-Pb dating of zircon grains from these granites yielded ages of 82.5±2.3 and 82±1.8 Ma, representing an episode of Late Cretaceous magmatic event. These granites are characterized by high peraluminous and have typical S-type geochemical signatures with high SiO_2(72.37 wt.%–73.07 wt.%), high A/CNK values(1.61–1.65) and Al_2O_3(14.4 wt.%–15 wt.%). They are enriched in Rb, U, K, Th, Ta and Pb and display pronounced negative Ba, Sr, Nb, Ti and Eu(Eu/Eu*=0.19–0.24) anomalies. The high degree of fractional crystallization is characterized by low Rb, Sr, Ba and Eu concentrations with high ratios of La/Sm and Eu/Eu*. Zircon grains show εHf(t) values from-9.69 to-0.9 and the corresponding TDM2 range from 1.2 to 1.7 Ga, indicating that these granites could be derived from the Proterozoic basement rocks with minor input from mantle-derived magmas. The calculation of Fe^(3+) and Fe^(2+) of biotites indicates a low oxygen fugacity condition(log fO_2 ranging from 10-17 to 10-18 bars, below MH), which is favorable for the W-Sn mineralization. Tungsten and tin have been enriched in granitic magmas through fractionation, and low oxygen fugacity conditions have promoted the accumulation and transportation of W-Sn in the hydrothermal fluids, leading to deposition of mineral phases. The geochemical data suggest that Piaoac granites formed in an extensional setting related with the Late Cretaceous magmatism occurring large-scale lithospheric extensional in South China Block.

关键词： geochemistry zircon U-Pb age Hf isotope Piaoac granite W-Sn mineralization Northern Vietnam

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A fully automated framework for helicopter rotor blades design and analysis including aerodynamics,structure, and manufacturing

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Chinese Journal of Aeronautics 2016年第6期29卷 1602-1617页

作者： Ngoc anh Vu Jae Woo Lee Tuan Phuong Nam Le Song Thanh Thao nguyen Division of Computational Mechatronics Institute for Computational Science Ton Duc Thang University Faculty of Electrical & Electronics Engineering Ton Duc Thang University Department of Aerospace Information Engineering Konkuk University Faculty of Mechanical Engineering Industrial University of Ho Chi Minh City Department of Aerospace Engineering Ho Chi Minh City University of Technology Vietnam National University-Ho Chi Minh City

This study describes an integrated framework in which basic aerospace engineering aspects(performance, aerodynamics, and structure) and practical aspects(configuration visualization and manufacturing) are coupled and considered in one fully automated design optimization of rotor blades. A number of codes are developed to robustly perform estimation of helicopter configuration from sizing, performance analysis, trim analysis, to rotor blades configuration representation. These codes are then integrated with a two-dimensional airfoil analysis tool to fully design rotor blades configuration including rotor planform and airfoil shape for optimal aerodynamics in both hover and forward flights. A modular structure design methodology is developed for realistic composite rotor blades with a sophisticated cross-sectional geometry. A D-spar cross-sectional structure is chosen as a baseline. The framework is able to analyze all realistic inner configurations including thicknesses of D-spar, skin, web, number and ply angles of layers of each composite part,and materials. A number of codes and commercial software(ANSYS, Gridgen, VABS, Pre VABS,etc.) are implemented to automate the structural analysis from aerodynamic data processing to sectional properties and stress analysis. An integrated model for manufacturing cost estimation ofcomposite rotor blades developed at the Aerodynamic Analysis and Design Laboratory(AADL),Aerospace Information Engineering Department, Konkuk University is integrated into the framework to provide a rapid and dynamic feedback to configuration design. The integration of three modules has constructed a framework where the size of a helicopter, aerodynamic performance analysis, structure analysis, and manufacturing cost estimation could be quickly investigated. All aspects of a rotor blade including planform, airfoil shape, and inner structure are considered in a multidisciplinary design optimization without an exception of critical configuration.

关键词： Design optimization Helicopter rotor blades Integrated framework Modular structure design methodology Perform estimation

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On the speed of convergence of Picard iterations of backward stochastic differential equations

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Probability, Uncertainty and Quantitative Risk 2022年第2期7卷 133-150页

作者： Martin Hutzenthaler Thomas Kruse Tuan anh nguyen Faculty of Mathematics University of Duisburg-EssenThea-Leymann-Str.9EssenNordrhein-Westfalen 45127Germany Institute of Mathematics University of GiessenArndtstraβe 2Giessen 35392Germany

It is a well-established fact in the scientific literature that Picard iterations of backward stochastic differential equations with globally Lipschitz continuous nonlinearities converge at least exponentially fast to the *** this paper we prove that this convergence is in fact at least square-root factorially *** show for one example that no higher convergence speed is possible in ***,if the nonlinearity is zindependent,then the convergence is even factorially *** we reveal a phase transition in the speed of convergence of Picard iterations of backward stochastic differential equations.

关键词： Backward stochastic differential equation Picard iteration A priori estimate Semilinear parabolic partial differential equation

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Assess the Effects of Sucrose on Post-Anoxic Denitrification through Lab-Scaled Sequence Batch Reactors （SBRs）

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Journal of Environmental Science and Engineering(B) 2016年第10期5卷 476-482页

作者： Duc anh phung Sy Chi phung Faculty of Engineering and Information Technology University of Technology Sydney Sydney 2007 Australia Institute of Environmental Sciences Nguyen Tat Thanh University Ho Chi Minh City 84.8 Vietnam

The aim of this study was to assess the impact of industrial-grade sucrose as external carbon source on post-anoxic denitrification. This was done through the use of lab-scaled Sequencing Batch Reactors （SBRs） modelling after a standard post-anoxic Waste Water Treatment Plant （WWTP）. Each reactor holds an effective volume of approximately 4 L, with the decant volume of 2 L per cycle, a Hydraulic Retention Time （HRT） of 8 hours, Sludge Retention Time （SRT） of about 11.5 ± 0.5 days. The experiments showed that adding industrial-grade sucrose into the post-anoxic zone has a very significant improvement where the nitrate removal rate increased from 10% to 68%. The experiment also verifies that most of the Specific Denitrification Rate （SDNR） calculated from the lab-scaled SBRs lie within the range of earlier study （2.29-2.85 mgNO3/gMLVSS/h）, and verified the results of both this experiment and the SDNR batch tests in previous study.

关键词： Sucrose post-anoxic denitrification external carbon source SBRs.

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CONVERGENCE RESULTS FOR NON-OVERLAP SCHWARZ WAVEFORM RELAXATION ALGORITHM WITH CHANGING TRANSMISSION CONDITIONS

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Acta Mathematica Scientia 2022年第1期42卷 105-126页

作者： Minh-Phuong TRAN Thanh-Nhan nguyen Phuoc-Toan HUYNH Nhu-Binh LY Minh-Dang nguyen Quoc-anh HO Applied Analysis Research Group Faculty of Mathematics and StatisticsTon Duc Thang UniversityHo Chi Minh cityVietnam Department of Mathematics Ho Chi Minh City University of EducationHo Chi Minh cityVietnam Faculty of Mathematics and Statistics Ton Duc Thang UniversityHo Chi Minh cityVietnam

In this paper,we establish a new algorithm to the non-overlapping Schwarz domain decomposition methods with changing transmission conditions for solving one dimensional advection reaction diffusion *** precisely,we first describe the new algorithm and prove the convergence results under several natural assumptions on the sequences of parameters which determine the transmission *** we give a simple method to estimate the new value of parameters in each *** interesting advantage of our method is that one may update the better parameters in each iteration to save the computational cost for optimizing the parameters after many *** some numerical experiments are performed to show the behavior of the convergence rate for the new method.

关键词： domain decomposition method Schwarz waveform relaxation algorithm advection reaction diffusion changing transmission conditions

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First Records of Megophrys daweimontis Rao and Yang, 1997 and Amolops vitreus(Bain, Stuart and Orlov, 2006)(Anura: Megophryidae, Ranidae) from Vietnam

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Asian Herpetological Research 2015年第1期6卷 66-72页

作者： Dzung Trung LE anh Van PHAM Son Hung Lan nguyen Thomas ZIEGLER Truong Quang nguyen Faculty of Biology Hanoi National University of Education Faculty of Biology and Chemistry Tay Bac University AG Zoologischer Garten Kln Institute of Ecology and Biological Resources Vietnam Academy of Science and Technology

Two amphibian species,Megophrys daweimontisandAmolops vitreus,are recorded for the ifrst time from Vietnam, on the basis of a new amphibian collection from Dien Bien and Son La provinces. In addition, acoustic analysis ofA. vitreus is also provided based on the advertisement calls recorded in Muong Nhe Nature Reserve of Dien Bien Province, Vietnam.

关键词： Amolops vitreus Megophrys daweimontis new records advertisement call Dien Bien Province Son La Province

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Enhanced urban functional land use map with free and open-source data

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International Journal of Digital Earth 2021年第11期14卷 1744-1757页

作者： T.T.Vu N.V.A.Vu H.P.phung L.D.nguyen Faculty of Engineering and Science Curtin University MalaysiaMiriMalaysia Vietnam National Space Center Vietnam Academy of Science and Technology(VAST)Ho Chi Minh cityVietnam

The study aims at developing an applicable methodology to produce the functional land-use map using only free and open-source ***-view Sentinel image and ground-view Open Street Map(OSM)data are chosen due to their extensive *** three-stage framework,including object-based image analysis,OSM data cleaning,and ontology-based decision fusion,is proposed and implemented with open-source *** applied the developed approach to districts 1,4,and 7 of HoChiMinh city,representing the complexities of the dynamic change in big *** result showed a good functional land use map with 78.70%overall *** outcome presents the mismatch between the data-driven approach and human knowledge,which can be improved by ontology-based fusion with OSM *** ontology-based framework comprises the common urban land-use classes and OSM attributes,which can be applied and extended in other urban *** text attributes may be applicable only locally and can be modified in our open-source ***-based image analysis takes advantage of Google Earth Engine computing power,whereas ontology-based processing works well on a local *** future studies,adopted natural language processing to pre-process OSM data and ontology-based fusion will be implemented on the cloud-computing platform to enhance computational efficiency.

关键词： Data fusion Remote Sensing Digital City Land use GIS

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Assess the Denitrification Performance of Fermented and Dark-fermented Biosolids as External Carbon Sources Using Sequence Batch Reactors （SBRS）

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Journal of Environmental Science and Engineering(B) 2016年第9期5卷 425-431页

作者： Duc anh phung Sy Chi phung School of Engineering Royal Melbourne Institute of Technology Melbourne 3000 Australia Institute of Environmental Sciences Nguyen Tat Thanh University Ho Chi Minh City 84.8 Viemam

The study has assessed the denitrification performance of fermented and dark-fermented biosolids as external carbon sources using lab-scaled Sequencing Batch Reactors （SBRs）. This was done by adding fermented and dark-fermented biosolids into anoxic zones of two SBRs, and then assessing the change of effluent characteristics comparing to before adding and to a third controlled reactor. The results showed that by adding 150-170 mg rbCOD/L of either of the selected fermented biosolids, almost complete denitrification could be reached for tested SBRs （reduced from initial -20 mg NO3/L to 〈 1 mg NO3/L）. Finally, the experiment also found that the impact of NI-I4 components of fermented and dark-fermented biosolids onto the final effluent were much lesser than expected, where only less than 2.5 mg NH4/L were detected in the effluent, much lower than the added 5.0-5.7 mg/L.

关键词： Fermented sludge dark fermentation external carbon source SBRs.

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Effective Evaluation of Using PIDOTIMOD in Treatment of Refractory Allergic Rhinitis

Effective Evaluation of Using PIDOTIMOD in Treatment of Refr...

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作者： Mai nguyen Quynh anh 大连医科大学

学位级别：硕士

目的观察匹多莫德对难治性过敏性鼻炎的治疗作用。方法研究以2019年8月至2020年8月期间于大连医科大学附属第一医院耳鼻喉科门诊诊断难治性过敏性鼻炎的68名患者为研究对象。患者随机分为两组,实验组和对照组。所有患者在治疗前均填写... 详细信息

目的观察匹多莫德对难治性过敏性鼻炎的治疗作用。方法研究以2019年8月至2020年8月期间于大连医科大学附属第一医院耳鼻喉科门诊诊断难治性过敏性鼻炎的68名患者为研究对象。患者随机分为两组,实验组和对照组。所有患者在治疗前均填写症状评分问卷,并进行鼻内窥镜检查,对鼻甲肿胀程度和鼻部分泌物情况进行评分。对照组患者给予口服抗组胺药和鼻喷布地奈德治疗;实验组患者在常规治疗基础上额外给予匹多莫德40mg,日两次口服。对比两组治疗前、治疗后两周、治疗后四周鼻部症状评分和鼻内窥镜检查评分评估匹多莫德治疗难治性过敏性鼻炎的临床效果。两组间比较采用配对T检验和Winconxon符号秩检验。结果治疗前对照组鼻部症状评分在鼻塞、流涕、鼻部刺痒感和喷嚏的得分分别是3.31±0.693,3.25±0.672,3.44±0.716,和 3.19±0.53;实验组分别是 3.22±0.659,2.75±0.672,3.16±0.723和2.94±0.669。两组之间差异无统计学意义(P>0.05)。鼻内窥镜下下鼻甲肿胀和鼻分泌物量评分在对照组分别是1.81±0.397,和2.69±0.471,实验组分别是1.84±0.369和2.47±0.621,差异无统计学意义(P>0.05)。治疗后两周对照组鼻部症状评分在鼻塞、流涕、鼻部刺痒感和喷嚏的得分分别是 2.94±0.669,2.81±0.644,2.75±0.762,和 2.44±0.504。实验组鼻部症状评分分别是 1.13±0.751,1.19±0.965,1.03±0.822,和 1.03±0.782。实验组较对照组在上述症状分别多下降1.81±0.082(61.56%),1.62±0.321(57.65%),1.72±0.06(62.54%),和1.41±0.278(57.78%),两组间比较,差异有统计学意义(P<0.05)。对照组鼻内窥镜下下鼻甲肿胀和鼻分泌物量评分分别是1.44±0.504和2.13±0.609;实验组分别是0.53±0.507和0.91±0.777,实验组下鼻甲肿胀和鼻内分泌物评分比对照组分别降低0.91±0.003(63.19%)和1.22±0.168(57.27%),两组对比差异有统计学意义(P<0.05)。治疗4周后对照组鼻塞、流涕、鼻部刺痒感和喷嚏的症状评分是0.47±0.507,0.50±0.508,0.44±0.564,和0.34 ± 0.483。实验组症状改善更多,比对照组减低1.84±0.186(79.65%),1.44±0.161(74.22%),1.69±0.143(79.34%),和 1.41±0.189(80.57%),差异有统计学意义(P<0.05)。对照组鼻内窥镜评分分别是1.19±.644和2.00±0.508,实验组评分分别为0.06±0.246和0.19±0.397,两组对比,实验组下鼻甲肿胀和鼻内分泌物评分比对照组分别降低1.13±0.398(94.95%)和1.81±0.111(90.5%)(P<0.05)。结论匹多莫德可以提高机体免疫力,辅助抗组胺药和鼻喷激素应用可以快速控制难治性过敏性鼻炎的临床症状和体征。

关键词：过敏性鼻炎过敏原免疫治疗匹多莫德

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